@import url('https://fonts.googleapis.com/css2?family=Genos:wght@400;700;800&family=Montserrat:wght@400;700&family=Ninja+Naruto&family=Comic+Neue:wght@400;700&family=Quicksand:wght@400;700&family=Roboto:wght@400;700&display=swap');

/* CSS Variables for Theme System – default: dark mode (Ninja); Print theme overrides to light */
:root {
    --bg-color: #1A1A1A;
    --text-color: #E8E8E8;
    --container-bg: #282828;
    --container-border: #404040;
    --primary-color: #EA580C;
    --primary-red: #DC2626;
    --primary-gradient: linear-gradient(to right, #EA580C, #DC2626);
    --heading-font: 'Montserrat', sans-serif;
    --body-font: 'Montserrat', sans-serif;
    /* Figma Hero_1 gradient */
    --hero-gradient: linear-gradient(223.45deg, rgb(137, 34, 34) 23.287%, rgb(169, 53, 53) 38.563%, rgb(200, 83, 11) 57.77%, rgb(204, 62, 11) 70.025%);
    --hero-pattern: linear-gradient(135deg, rgba(255,255,255,0.04) 25%, transparent 25%), linear-gradient(225deg, rgba(255,255,255,0.04) 25%, transparent 25%), linear-gradient(45deg, rgba(255,255,255,0.04) 25%, transparent 25%);
    --board-visible: block;
    --board-bg: linear-gradient(180deg, #8B4513 0%, #A0522D 10%, #8B4513 20%, #CD853F 30%, #8B4513 40%, #A0522D 50%, #8B4513 60%, #CD853F 70%, #A0522D 80%, #8B4513 90%, #654321 100%);
    --board-border: #654321;
    --muted-bg: #2d2d2d;
    --muted-text: #a0a0a0;
    --link-color: #7DD3FC;
    --link-color-hover: #BAE6FD;
}

/* Print Friendly Theme (light) */
body.theme-print {
    --bg-color: #FFFFFF;
    --text-color: #000000;
    --container-bg: #FFFFFF;
    --container-border: #CCCCCC;
    --primary-color: #007bff;
    --primary-gradient: linear-gradient(to right, #007bff, #0056b3);
    --heading-font: 'Montserrat', sans-serif;
    --board-visible: none;
    --board-bg: #F8F9FA;
    --board-border: #DEE2E6;
    --muted-bg: #FFF7ED;
    --muted-text: #6b7280;
    --link-color: #0284C7;
    --link-color-hover: #0369A1;
}
body.theme-print .main-nav {
    background: #FFFFFF;
}

html,
body {
    overflow-x: hidden;
}

body {
    font-family: var(--body-font);
    line-height: 1.6;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
}

@media (max-width: 480px) {
    body {
        padding-left: 12px;
        padding-right: 12px;
    }
}

/* Hero Section – two modes: image (desktop ≥900px) vs responsive HTML (narrow) */
.hero-section {
    position: relative;
    border: none;
    margin: 0 0 30px 0;
    border-radius: 50px;
    overflow: hidden;
    box-shadow: 0 4px 4px rgba(0, 0, 0, 0.25);
}

.hero-section.hero-hidden {
    display: none !important;
}

/* ----- Desktop (≥900px): single image from Figma export ----- */
.hero-image-wrap {
    display: none;
}

@media (min-width: 900px) {
    .hero-image-wrap {
        display: block;
        position: relative;
        width: 100%;
        /* Match exported SVG viewBox to avoid letterboxing lines */
        aspect-ratio: 2039 / 1016;
        border-radius: inherit;
        overflow: hidden;
        background: var(--hero-gradient);
    }
    .hero-desktop-img {
        display: block;
        width: 100%;
        height: 100%;
        object-fit: contain;
        object-position: center;
        vertical-align: middle;
        border: none;
        /* Reduce sub-pixel edge artifacts on some screens */
        transform: translateZ(0);
    }
    /* Clickable CTA aligned to button in Hero_1.svg (rect 270,860 1026×109 in viewBox 2039×1016) */
    .hero-cta-overlay {
        position: absolute;
        left: 13.25%;
        bottom: 4.6%;
        width: 50.3%;
        height: 10.75%;
        background: transparent;
        border: none;
        cursor: pointer;
        z-index: 2;
        font-size: 0;
        color: transparent;
    }
    .hero-cta-overlay:focus-visible {
        outline: 2px solid #d9ff05;
        outline-offset: 2px;
    }
}

/* ----- Narrow (<900px): responsive HTML hero ----- */
.hero-responsive-wrap {
    display: block;
    background: var(--hero-gradient);
    border-radius: inherit;
    padding: clamp(32px, 5vw, 56px) clamp(24px, 4vw, 48px);
}

@media (min-width: 900px) {
    .hero-responsive-wrap {
        display: none !important;
    }
}

/* Beta Notice */
.beta-notice {
    background: var(--muted-bg);
    color: #F59E0B;
    padding: 10px 18px;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    display: inline-block;
    margin-top: 16px;
    border: 1px solid rgba(234, 88, 12, 0.4);
    font-family: var(--body-font);
    text-align: center;
    line-height: 1.4;
    max-width: 400px;
}

.beta-feedback-link {
    color: var(--link-color, #7DD3FC);
    text-decoration: underline;
    cursor: pointer;
    transition: color 0.2s ease;
    font-weight: 600;
}

.beta-feedback-link:hover {
    color: var(--link-color-hover, #BAE6FD);
    text-decoration: underline;
}

.hero-bg-gradient {
    position: absolute;
    inset: 0;
    pointer-events: none;
    border-radius: inherit;
}

.hero-inner {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr auto;
    grid-template-rows: auto auto;
    gap: clamp(24px, 4vw, 48px);
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    min-height: 280px;
}

/* Desktop: title + text in col 1, ninja in col 2 spanning both rows */
@media (min-width: 900px) {
    .hero-title-wrap { grid-column: 1; grid-row: 1; }
    .hero-text-block { grid-column: 1; grid-row: 2; }
    .hero-ninja-wrap { grid-column: 2; grid-row: 1 / -1; align-self: center; }
}

/* Narrow: single column, order = title → ninja (50%) → taglines/ops/CTA */
@media (max-width: 899px) {
    .hero-inner {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
        text-align: center;
        justify-items: center;
    }
    .hero-title-wrap { grid-row: 1; }
    .hero-ninja-wrap { grid-row: 2; width: 50%; max-width: 280px; margin: 0 auto; }
    .hero-text-block {
        grid-row: 3;
        text-align: center;
        display: flex;
        flex-direction: column;
        align-items: center;
        width: 100%;
        max-width: 100%;
    }
}

.hero-title-wrap {
    text-align: left;
}

@media (max-width: 899px) {
    .hero-title-wrap { text-align: center; }
    .hero-tagline-1,
    .hero-tagline-2 { text-align: center; }
}

.hero-text-block {
    text-align: left;
}

@media (min-width: 900px) {
    .hero-text-block { text-align: left; }
}

/* Figma: Genos Bold, 144px → responsive */
.hero-title {
    font-family: 'Genos', sans-serif;
    font-weight: 700;
    font-size: clamp(2.5rem, 8vw, 5.5rem);
    line-height: 1.1;
    color: #ffffff;
    margin: 0 0 0.5em 0;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

/* Figma: Montserrat Bold, 75px, white – two lines: "BECOME A MATH NINJA" / "IN JUST 3 MINUTES A DAY" */
.hero-tagline-1 {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: clamp(1rem, 3.5vw, 2.8rem);
    line-height: 1.2;
    color: #ffffff;
    margin: 0 0 0.35em 0;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}
.hero-tagline-1 br { display: block; }

/* Figma: Montserrat Bold, 60px, #433d3d */
.hero-tagline-2 {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: clamp(1rem, 2.5vw, 2rem);
    line-height: 1.2;
    color: #433d3d;
    margin: 0 0 1em 0;
    text-shadow: 0 1px 2px rgba(255, 255, 255, 0.2);
}

/* Figma: 130×130px, 15px radius – belt colors (+ − × ÷) */
.hero-ops {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 12px;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

@media (max-width: 900px) {
    .hero-ops { justify-content: center; }
}

.hero-op {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: clamp(56px, 10vw, 130px);
    height: clamp(56px, 10vw, 130px);
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: clamp(1.5rem, 4vw, 3.2rem);
    line-height: 1;
    border-radius: 15px;
    flex-shrink: 0;
}

/* Figma: 130×130, 15px radius, opacity 85% */
.hero-op-add { background: #e8e8e8; color: #000000; opacity: 0.85; }
.hero-op-subtract { background: #0058ff; color: #ffffff; opacity: 0.85; }
.hero-op-multiply { background: #8244e7; color: #ffffff; opacity: 0.85; }
.hero-op-divide { background: #70371d; color: #ffffff; opacity: 0.85; }

/* Figma: bg #161f7d, text #d9ff05, border-radius 31px, Montserrat Bold 60px */
.hero-cta-btn {
    background: #161f7d;
    border: none;
    color: #d9ff05;
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: clamp(1.1rem, 2.5vw, 2.25rem);
    padding: 0.65em 1.25em;
    min-height: 56px;
    border-radius: 31px;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease, color 0.2s ease;
    display: inline-block;
}

.hero-cta-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
    color: #ffffff;
}

.hero-ninja-wrap {
    position: relative;
    max-width: min(712px, 100%);
    min-width: 200px;
    margin: 0 auto;
    display: block;
}

.hero-ninja-img {
    width: 100%;
    height: auto;
    min-height: 200px;
    display: block;
    object-fit: contain;
    object-position: center;
}

.hero-section .hero-signup-hint {
    position: relative;
    z-index: 1;
    text-align: center;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.85);
    margin-top: 12px;
    margin-bottom: 0;
}

.hero-section .beta-notice {
    position: relative;
    z-index: 1;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

/* About page hero – exact same Figma Hero_1 as main hero (uses .hero-section styles) */
.about-hero.hero-section {
    margin-bottom: 28px;
}

.hero-signup-hint {
    font-size: 0.9rem;
    color: rgba(26, 26, 26, 0.75);
    font-style: italic;
    margin-top: 8px;
}

.hero-signup-link {
    margin-top: 15px;
}

.hero-signup-link a {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.9em;
    font-weight: 600;
    transition: all 0.2s ease;
}

.hero-signup-link a:hover {
    text-decoration: underline;
    color: var(--primary-red);
}

.hero-demo-btn {
    background: rgba(26, 26, 26, 0.15);
    border: 2px solid rgba(26, 26, 26, 0.4);
    color: #1A1A1A;
    font-size: 1.1em;
    font-weight: 600;
    padding: 14px 30px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: var(--body-font);
    margin-top: 15px;
    display: inline-block;
}

.hero-demo-btn:hover {
    background: rgba(26, 26, 26, 0.25);
    border-color: #1A1A1A;
    transform: translateY(-2px);
}

/* Demo Modal */
.demo-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease-in;
}

.demo-modal-content {
    background: #FFFFFF;
    border: 2px solid var(--container-border);
    border-radius: 16px;
    padding: 40px;
    max-width: 600px;
    width: 90%;
    position: relative;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
    animation: slideUp 0.3s ease-out;
}

/* Print theme - white background for demo modal */
body.theme-print .demo-modal-content {
    background: #FFFFFF;
}

.demo-modal-content h3 {
    text-align: center;
    margin-bottom: 30px;
    font-size: 1.5rem;
    font-weight: 800;
    color: #1A1A1A;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.demo-options {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 20px;
}

/* Header right: profile (mobile when logged in) + hamburger */
.main-nav-right-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}
.main-nav-profile-btn {
    display: none;
    width: 44px;
    height: 44px;
    padding: 0;
    border-radius: 50%;
    background: transparent;
    cursor: pointer;
    overflow: visible;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: background 0.2s, border-color 0.2s;
}
/* No belt yet: thick light gray dashed ring */
.main-nav-profile-btn.profile-btn-no-belt {
    border: 8px dashed #c4c4c4;
}
/* Has belt: thick solid ring in belt color */
.main-nav-profile-btn.profile-btn-has-belt {
    border: 8px solid var(--profile-belt-color, var(--primary-color));
}
.main-nav-profile-btn:hover {
    background: rgba(234, 88, 12, 0.25);
}
.main-nav-profile-btn.profile-btn-no-belt:hover {
    border-color: #9ca3af;
}
.main-nav-profile-btn.profile-btn-has-belt:hover {
    border-color: var(--profile-belt-color);
}
.profile-avatar-ring-inner {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    overflow: hidden;
}
.main-nav-profile-btn .profile-avatar-ring-inner img,
.main-nav-profile-btn .profile-avatar-ring-inner .avatar-circle {
    width: 28px !important;
    height: 28px !important;
    max-width: 28px;
    max-height: 28px;
}
.main-nav-profile-btn img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Mobile nav drawer: account section (Settings, Sign Out when logged in) */
.mobile-nav-account {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid rgba(234, 88, 12, 0.25);
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.mobile-nav-account-btn {
    width: 100%;
    padding: 14px 18px;
    font-size: 16px;
    text-align: left;
    border-radius: 8px;
    border: none;
    background: transparent;
    color: var(--text-color);
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
}
.mobile-nav-account-btn:hover {
    background: rgba(234, 88, 12, 0.15);
    color: var(--primary-color);
}

/* Show hamburger and hide nav tabs at same breakpoint as narrow hero (tablet / large phone) */
@media (max-width: 899px) {
    .main-nav-menu-btn {
        display: flex;
    }
    .main-nav-tabs {
        display: none !important; /* hide nav tabs; use hamburger menu */
    }
}

@media (max-width: 768px) {
    .main-nav-inner {
        padding-right: 20px; /* room for profile + hamburger only; auth banner hidden when logged in */
        gap: 12px;
    }
    .main-nav-brand {
        font-size: 1.25em;
        min-width: 0;
        overflow: hidden;
        text-overflow: ellipsis;
    }
    .main-nav-right-actions {
        flex-shrink: 0;
    }
    .main-nav-menu-btn {
        display: flex;
    }
    /* On mobile when logged in: show profile icon in header; hide full auth bar in header */
    .main-nav-profile-btn.is-visible {
        display: flex !important;
    }
    .auth-container-fixed-top-right .auth-user-info {
        display: none !important;
    }
    /* Slightly smaller Join button in header on mobile */
    .main-nav .main-nav-auth .auth-join-btn {
        padding: 6px 14px;
        font-size: 0.9em;
    }
    .main-nav-tabs {
        display: none !important; /* hide nav tabs on mobile; use hamburger menu */
    }
    .main-nav-tabs .tab-btn {
        padding: 8px 12px;
        font-size: 14px;
    }
    .demo-options {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .demo-modal-content {
        padding: 25px;
        width: 95%;
    }
}

.demo-option-btn {
    background: var(--container-bg);
    border: 2px solid var(--container-border);
    border-radius: 12px;
    padding: 20px 15px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--text-color);
}

.demo-option-btn:hover {
    transform: translateY(-4px);
    border-color: var(--primary-color);
    background: var(--muted-bg);
    box-shadow: 0 6px 20px rgba(234, 88, 12, 0.15);
}

.demo-option-title {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--primary-color);
    font-family: var(--heading-font);
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.demo-option-operations {
    display: flex;
    gap: 8px;
    align-items: center;
    justify-content: center;
}

.demo-option-operation {
    width: 48px;
    height: 48px;
    border: 2px solid var(--container-border);
    background: var(--container-bg);
    border-radius: 10px;
    font-size: 1.25rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-family: var(--body-font);
    box-shadow: 0 2px 6px rgba(0,0,0,0.08);
}

.demo-option-details {
    display: flex;
    flex-direction: column;
    gap: 6px;
    width: 100%;
    align-items: center;
}

.demo-option-row {
    font-size: 0.9em;
    text-align: center;
    opacity: 0.9;
    width: 100%;
    padding: 2px 0;
}

.demo-customize-btn {
    display: block;
    width: 100%;
    margin-top: 10px;
    padding: 12px 20px;
    background: var(--muted-bg);
    border: 2px solid var(--container-border);
    border-radius: 10px;
    color: var(--text-color);
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.demo-customize-btn:hover {
    border-color: var(--primary-color);
    background: var(--muted-bg);
    color: var(--primary-color);
}

.demo-modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    background: var(--muted-bg);
    border: 2px solid var(--container-border);
    color: var(--text-color);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2em;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.demo-modal-close:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: #FFF;
    transform: scale(1.05);
}

/* Top-Right Auth Container */
.auth-container-top-right {
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 1000;
}

/* Auth Container in Hero Section - Top Right */
.auth-container-hero-top-right {
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 1000;
}

/* Auth Container - when floating (legacy/fallback) */
.auth-container-fixed-top-right {
    position: fixed;
    top: 14px;
    right: 14px;
    z-index: 1001;
}

/* Auth merged into main header - flows in nav bar */
.main-nav .main-nav-auth {
    position: static;
    top: auto;
    right: auto;
    margin-left: auto;
    display: flex;
    align-items: center;
    flex-shrink: 0;
    z-index: auto;
}

/* Fixed main nav bar – dark bar with orange accent to match card */
.main-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: #1A1A1A;
    border-bottom: 2px solid rgba(234, 88, 12, 0.3);
    box-shadow: 0 2px 16px rgba(0, 0, 0, 0.15);
    padding-top: env(safe-area-inset-top, 0);
    padding-left: env(safe-area-inset-left, 0);
    padding-right: env(safe-area-inset-right, 0);
}

.main-nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 12px 20px;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 24px;
}

.main-nav-brand {
    font-family: 'Genos', sans-serif;
    font-size: 1.35em;
    font-weight: 700;
    color: var(--primary-red);
    -webkit-text-stroke: calc(8 / 200 * 1em) #892222;
    paint-order: stroke fill;
    white-space: nowrap;
    letter-spacing: 0.02em;
}

.main-nav-tabs {
    display: flex;
    align-items: flex-start;
    gap: 4px;
}

.main-nav-tabs .tab-btn {
    margin-bottom: 0;
    padding: 10px 18px;
    font-size: 15px;
    border-bottom: none;
    border-radius: 6px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    text-align: center;
    line-height: 1.25;
    white-space: normal;
}

.main-nav-tabs .tab-btn {
    color: rgba(255, 255, 255, 0.85);
}
.main-nav-tabs .tab-btn:hover {
    background: rgba(234, 88, 12, 0.25);
    color: #fff;
}

.main-nav-tabs .tab-btn.active {
    background: rgba(234, 88, 12, 0.4);
    border-radius: 6px;
    color: #fff;
}

/* Hamburger menu button - hidden on desktop only (mobile/tablet: shown via @media (max-width: 899px)) */
@media (min-width: 900px) {
    .main-nav-menu-btn {
        display: none;
    }
}
.main-nav-menu-btn {
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    padding: 0;
    background: transparent;
    border: 2px solid rgba(255, 255, 255, 0.4);
    border-radius: 8px;
    cursor: pointer;
    color: #fff;
    transition: background 0.2s, border-color 0.2s;
}
.main-nav-menu-btn:hover {
    background: rgba(234, 88, 12, 0.25);
    border-color: var(--primary-color);
}
.menu-icon-line {
    display: block;
    width: 22px;
    height: 2px;
    background: currentColor;
    border-radius: 1px;
}

/* Mobile nav drawer */
.mobile-nav-drawer {
    position: fixed;
    inset: 0;
    z-index: 999;
    visibility: hidden;
    pointer-events: none;
    transition: visibility 0.25s ease;
}
.mobile-nav-drawer.is-open {
    visibility: visible;
    pointer-events: auto;
}
.mobile-nav-drawer-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    opacity: 0;
    transition: opacity 0.25s ease;
}
.mobile-nav-drawer.is-open .mobile-nav-drawer-backdrop {
    opacity: 1;
}
.mobile-nav-drawer-panel {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(280px, 85vw);
    background: var(--container-bg);
    border-left: 2px solid var(--container-border);
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.12);
    display: flex;
    flex-direction: column;
    align-items: stretch;
    padding: 60px 20px 24px;
    transform: translateX(100%);
    transition: transform 0.25s ease;
}
.mobile-nav-drawer.is-open .mobile-nav-drawer-panel {
    transform: translateX(0);
}
.mobile-nav-drawer-close {
    position: absolute;
    top: 14px;
    right: 14px;
    width: 40px;
    height: 40px;
    padding: 0;
    background: rgba(234, 88, 12, 0.2);
    border: 1px solid rgba(234, 88, 12, 0.4);
    color: var(--text-color);
    border-radius: 50%;
    font-size: 1.2em;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}
.mobile-nav-drawer-close:hover {
    background: rgba(234, 88, 12, 0.35);
}
.mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.mobile-nav-links .tab-btn {
    width: 100%;
    padding: 14px 18px;
    font-size: 16px;
    text-align: center;
    border-radius: 8px;
    border: none;
    background: transparent;
    color: var(--text-color);
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    line-height: 1.25;
    white-space: normal;
}
.mobile-nav-links .tab-btn:hover,
.mobile-nav-links .tab-btn.active {
    background: rgba(234, 88, 12, 0.25);
    color: #fff;
}

/* Lock nav and level track picker during an active level test */
body.level-test-in-progress .main-nav-tabs .tab-btn,
body.level-test-in-progress .level-track-picker .track-picker-btn {
    opacity: 0.5;
    pointer-events: none;
    cursor: not-allowed;
}

/* Ready-to-start overlay (level) */
.level-ready-overlay kbd {
    padding: 2px 6px;
    font-size: 0.9em;
    background: rgba(255,255,255,0.2);
    border-radius: 4px;
    border: 1px solid rgba(255,255,255,0.3);
}
.level-ready-overlay .level-ready-start-btn {
    transition: background 0.2s, transform 0.2s;
}
.level-ready-overlay .level-ready-start-btn:hover {
    background: linear-gradient(135deg, #a00, #6a0000);
    transform: scale(1.02);
}
.level-ready-overlay .level-ready-start-btn:focus {
    outline: 2px solid rgba(255,255,255,0.5);
    outline-offset: 2px;
}

/* Content starts below fixed nav */
.main-content-wrap {
    padding-top: calc(56px + env(safe-area-inset-top, 0px));
}

/* Site footer: age notice and contact */
.site-footer {
    margin-top: 2rem;
    padding: 1.25rem 1rem 2rem;
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted, #666);
    border-top: 1px solid rgba(0, 0, 0, 0.08);
}
.site-footer-contact {
    margin: 0;
}
.site-footer-contact a {
    color: var(--link-color, #ea580c);
    text-decoration: none;
}
.site-footer-contact a:hover {
    text-decoration: underline;
}
.site-footer a {
    color: var(--link-color, #ea580c);
    text-decoration: none;
}
.site-footer a:hover {
    text-decoration: underline;
}
.site-footer-sep {
    margin: 0 0.4rem;
    opacity: 0.7;
}
.site-footer-version {
    font-size: 0.75rem;
    opacity: 0.8;
}

/* Cookie / local storage notice (bottom bar) */
.cookie-notice {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 9998;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 12px 16px;
    padding: 12px 16px 14px;
    background: var(--bg-dark, #1a1a1a);
    color: var(--text-muted, #ccc);
    font-size: 0.875rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 -2px 12px rgba(0, 0, 0, 0.2);
}
.cookie-notice-text {
    margin: 0;
    max-width: 56ch;
}
.cookie-notice-text a {
    color: var(--link-color, #ea580c);
    text-decoration: underline;
}
.cookie-notice-text a:hover {
    text-decoration: none;
}
.cookie-notice-btn {
    flex-shrink: 0;
    padding: 8px 16px;
    font-size: 0.9rem;
    font-weight: 600;
    color: #fff;
    background: var(--accent, #ea580c);
    border: none;
    border-radius: 6px;
    cursor: pointer;
}
.cookie-notice-btn:hover {
    filter: brightness(1.1);
}

.auth-container-top-right .auth-user-info,
.auth-container-hero-top-right .auth-user-info,
.auth-container-fixed-top-right .auth-user-info {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(40, 40, 40, 0.9);
    padding: 8px 15px;
    border-radius: 8px;
    border: 1px solid rgba(234, 88, 12, 0.4);
}

/* Desktop: more space for auth in header */
.main-nav .main-nav-auth .auth-user-info {
    gap: 14px;
    padding: 10px 18px;
    background: rgba(50, 50, 50, 0.95);
    border-radius: 10px;
}
.main-nav .main-nav-auth .user-greeting {
    gap: 10px;
}
.main-nav .main-nav-auth .user-greeting img {
    width: 36px;
    height: 36px;
}
.main-nav .main-nav-auth .user-name {
    max-width: 180px;
    font-size: 0.95em;
}
.main-nav .main-nav-auth .sign-out-btn {
    padding: 8px 16px;
    font-size: 0.9em;
}
.main-nav .main-nav-auth .settings-gear-btn {
    padding: 6px;
    font-size: 1.1em;
}

.auth-container-top-right .user-greeting,
.auth-container-hero-top-right .user-greeting,
.auth-container-fixed-top-right .user-greeting {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9em;
}

.auth-container-top-right .user-icon,
.auth-container-hero-top-right .user-icon,
.auth-container-fixed-top-right .user-icon {
    font-size: 1.2em;
}

.auth-container-top-right .user-name,
.auth-container-hero-top-right .user-name,
.auth-container-fixed-top-right .user-name {
    max-width: 150px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.auth-container-top-right .sign-out-btn,
.auth-container-hero-top-right .sign-out-btn,
.auth-container-fixed-top-right .sign-out-btn {
    padding: 6px 12px;
    font-size: 0.85em;
    background: rgba(234, 88, 12, 0.3);
    border: 1px solid rgba(234, 88, 12, 0.5);
    color: var(--text-color);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.auth-container-top-right .sign-out-btn:hover,
.auth-container-hero-top-right .sign-out-btn:hover,
.auth-container-fixed-top-right .sign-out-btn:hover {
    background: rgba(234, 88, 12, 0.5);
}

/* Compact Auth Forms for Top-Right */
.auth-container-top-right .auth-forms-container,
.auth-container-hero-top-right .auth-forms-container,
.auth-container-fixed-top-right .auth-forms-container {
    display: flex;
    gap: 2px;
    align-items: flex-start;
    justify-content: flex-end;
}

/* Single "Join" button + dropdown (sign up / log in) */
.auth-join-wrap {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: flex-end;
}
.auth-join-btn {
    padding: 8px 18px;
    font-size: 0.95em;
    font-weight: 600;
    background: var(--primary-gradient);
    color: white;
    border: 2px solid var(--primary-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--body-font);
    white-space: nowrap;
    box-shadow: 0 2px 6px rgba(234, 88, 12, 0.3);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.auth-join-btn .auth-join-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
.auth-join-btn .auth-join-icon svg {
    width: 1em;
    height: 1em;
}
.auth-join-btn:hover {
    background: linear-gradient(to right, var(--primary-red), var(--primary-red));
    transform: scale(1.05);
    box-shadow: 0 4px 10px rgba(234, 88, 12, 0.4);
}
.auth-join-panel {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    min-width: 280px;
    background: var(--container-bg);
    border: 1px solid var(--container-border);
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
    padding: 16px;
    z-index: 1002;
    display: none;
}
.auth-join-panel.is-open {
    display: block;
}
.auth-join-toggles {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
}
.auth-join-toggles button {
    flex: 1;
    padding: 10px 14px;
    font-size: 0.9em;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    font-family: var(--body-font);
    border: 2px solid transparent;
}
.auth-join-toggles button.active {
    background: var(--primary-gradient);
    color: white;
    border-color: var(--primary-color);
}
.auth-join-toggles button:not(.active) {
    background: rgba(234, 88, 12, 0.15);
    color: var(--text-color);
    border-color: rgba(234, 88, 12, 0.3);
}
.auth-join-toggles button:not(.active):hover {
    background: rgba(234, 88, 12, 0.25);
}
.auth-join-panel .auth-form-container,
.auth-join-panel #signUpFormContainer,
.auth-join-panel #signInFormContainer {
    background: transparent;
    padding: 0;
    border: none;
    box-shadow: none;
    margin-top: 0;
    min-width: auto;
}
.auth-join-panel .auth-section h3 {
    color: var(--primary-color);
    font-size: 1em;
    margin: 0 0 10px 0;
}

.auth-toggle-btn {
    padding: 8px 16px;
    font-size: 0.9em;
    font-weight: 600;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--body-font);
    white-space: nowrap;
}

.auth-toggle-btn.primary {
    background: var(--primary-gradient);
    color: white;
    border: 2px solid var(--primary-color);
    box-shadow: 0 2px 6px rgba(234, 88, 12, 0.3);
}

.auth-toggle-btn.primary:hover {
    background: linear-gradient(to right, var(--primary-red), var(--primary-red));
    transform: scale(1.05);
    box-shadow: 0 4px 10px rgba(234, 88, 12, 0.4);
}

.auth-toggle-btn.secondary {
    background: rgba(234, 88, 12, 0.2);
    color: var(--text-color);
    border: 1px solid rgba(234, 88, 12, 0.4);
    opacity: 0.8;
}

.auth-toggle-btn.secondary:hover {
    background: rgba(234, 88, 12, 0.3);
    opacity: 1;
    transform: scale(1.05);
}

.auth-container-top-right .auth-section,
.auth-container-hero-top-right .auth-section,
.auth-container-fixed-top-right .auth-section {
    background: transparent;
    padding: 0;
    border-radius: 8px;
    border: none;
    min-width: auto;
}

/* Light tan background for auth form containers when visible */
.auth-container-top-right .auth-form-container,
.auth-container-hero-top-right .auth-form-container,
.auth-container-fixed-top-right .auth-form-container,
.auth-container-top-right #signUpFormContainer,
.auth-container-hero-top-right #signUpFormContainer,
.auth-container-fixed-top-right #signUpFormContainer,
.auth-container-top-right #signInFormContainer,
.auth-container-hero-top-right #signInFormContainer,
.auth-container-fixed-top-right #signInFormContainer {
    background: var(--container-bg);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid var(--container-border);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    margin-top: 10px;
    min-width: 280px;
}

.auth-container-top-right .auth-section h3,
.auth-container-hero-top-right .auth-section h3,
.auth-container-fixed-top-right .auth-section h3 {
    font-size: 1em;
    margin: 0 0 10px 0;
    color: var(--primary-color);
}

/* Text colors for form elements on light tan background */
.auth-container-top-right #signUpFormContainer h3,
.auth-container-hero-top-right #signUpFormContainer h3,
.auth-container-fixed-top-right #signUpFormContainer h3,
.auth-container-top-right #signInFormContainer h3,
.auth-container-hero-top-right #signInFormContainer h3,
.auth-container-fixed-top-right #signInFormContainer h3 {
    color: var(--primary-color);
    font-weight: bold;
}

.auth-container-top-right #signUpFormContainer .form-group label,
.auth-container-hero-top-right #signUpFormContainer .form-group label,
.auth-container-fixed-top-right #signUpFormContainer .form-group label,
.auth-container-top-right #signInFormContainer .form-group label,
.auth-container-hero-top-right #signInFormContainer .form-group label,
.auth-container-fixed-top-right #signInFormContainer .form-group label {
    color: var(--text-color);
}

.auth-container-top-right #signUpFormContainer .form-group input,
.auth-container-hero-top-right #signUpFormContainer .form-group input,
.auth-container-fixed-top-right #signUpFormContainer .form-group input,
.auth-container-top-right #signInFormContainer .form-group input,
.auth-container-hero-top-right #signInFormContainer .form-group input,
.auth-container-fixed-top-right #signInFormContainer .form-group input {
    background: var(--muted-bg);
    color: var(--text-color);
    border: 1px solid var(--container-border);
}

.auth-container-top-right #signUpFormContainer .form-group input:focus,
.auth-container-hero-top-right #signUpFormContainer .form-group input:focus,
.auth-container-fixed-top-right #signUpFormContainer .form-group input:focus,
.auth-container-top-right #signInFormContainer .form-group input:focus,
.auth-container-hero-top-right #signInFormContainer .form-group input:focus,
.auth-container-fixed-top-right #signInFormContainer .form-group input:focus {
    background: var(--muted-bg);
    border-color: rgba(234, 88, 12, 0.6);
}

.auth-container-top-right #signUpFormContainer .auth-switch,
.auth-container-hero-top-right #signUpFormContainer .auth-switch,
.auth-container-fixed-top-right #signUpFormContainer .auth-switch,
.auth-container-top-right #signInFormContainer .auth-switch,
.auth-container-hero-top-right #signInFormContainer .auth-switch,
.auth-container-fixed-top-right #signInFormContainer .auth-switch {
    color: var(--text-color);
}

.auth-container-top-right .auth-form,
.auth-container-hero-top-right .auth-form,
.auth-container-fixed-top-right .auth-form {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.auth-container-top-right .form-group,
.auth-container-hero-top-right .form-group,
.auth-container-fixed-top-right .form-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.auth-container-top-right .form-group label,
.auth-container-hero-top-right .form-group label,
.auth-container-fixed-top-right .form-group label {
    font-size: 0.8em;
    color: rgba(224, 224, 224, 0.8);
}

.auth-container-top-right .form-group input,
.auth-container-hero-top-right .form-group input,
.auth-container-fixed-top-right .form-group input {
    padding: 6px 8px;
    font-size: 0.85em;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(234, 88, 12, 0.3);
    border-radius: 4px;
    color: var(--text-color);
}

.auth-container-top-right .auth-btn,
.auth-container-hero-top-right .auth-btn,
.auth-container-fixed-top-right .auth-btn {
    padding: 6px 12px;
    font-size: 0.85em;
    margin-top: 5px;
}

.auth-container-top-right .auth-switch,
.auth-container-hero-top-right .auth-switch,
.auth-container-fixed-top-right .auth-switch {
    font-size: 0.75em;
    margin-top: 8px;
    text-align: center;
}

.auth-container-top-right .auth-switch a,
.auth-container-hero-top-right .auth-switch a,
.auth-container-fixed-top-right .auth-switch a {
    color: var(--primary-color);
    text-decoration: underline;
}

.auth-container-top-right .error-message,
.auth-container-hero-top-right .error-message,
.auth-container-fixed-top-right .error-message {
    font-size: 0.75em;
    padding: 4px;
    margin-top: 4px;
}

.container {
    background: var(--container-bg);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    margin: 20px 0;
    border: 2px solid var(--container-border);
    position: relative; /* For absolute positioning of auth container */
}

/* Levels page: no red left border (sidebar effect); class set by JS when Levels tab is active */
.container.levels-tab-active {
    border-left: none;
}

h1, h2 {
    font-family: var(--heading-font);
    color: var(--primary-color);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    margin-bottom: 20px;
}

#problemsSection h2 {
    text-shadow: none;
}

.tab-container {
    margin-top: 0;
}

.tab-buttons {
    display: flex;
    margin-bottom: 20px;
}

.tab-btn {
    background: none;
    border: none;
    padding: 12px 24px;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-color);
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: all 0.2s ease;
    font-family: var(--body-font);
}

.tab-btn:hover {
    color: var(--primary-color);
    background: rgba(234, 88, 12, 0.08);
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    background: rgba(234, 88, 12, 0.08);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

form {
    display: grid;
    gap: 10px;
}

fieldset {
    border: none;
    padding: 10px 0;
    margin: 15px 0;
    color: #E0E0E0; /* Light text for dark mode */
}

.range-fieldset-with-tip {
    position: relative;
}

.range-fieldset-content {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.range-fieldset-main {
    flex: 1;
}

.keyboard-tip {
    background: rgba(234, 88, 12, 0.15);
    border: 1px solid rgba(234, 88, 12, 0.3);
    border-radius: 8px;
    padding: 12px 16px;
    margin-top: 25px;
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 280px;
    max-width: 320px;
    flex-shrink: 0;
}

.tip-icon {
    font-size: 1.2em;
    flex-shrink: 0;
}

.tip-text {
    font-size: 0.9em;
    color: var(--text-color);
    line-height: 1.4;
}

.tip-text kbd {
    background: rgba(234, 88, 12, 0.3);
    border: 1px solid rgba(234, 88, 12, 0.5);
    border-radius: 4px;
    padding: 2px 6px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
    font-weight: bold;
    color: var(--text-color);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
    display: inline-block;
    margin: 0 2px;
}

@media (max-width: 768px) {
    .range-fieldset-content {
        flex-direction: column;
    }
    
    .keyboard-tip {
        width: 100%;
        max-width: 100%;
        margin-top: 15px;
    }
}

label {
    display: block;
    color: #E0E0E0; /* Light text for dark mode */
}

legend {
    font-weight: 600;
    color: #E0E0E0; /* Light text for dark mode */
    margin-bottom: 8px;
    font-size: 14px;
    font-family: 'Montserrat', sans-serif; /* Consistent font */
}

/* Desktop: scrollable viewport so active row stays in same place when moving between problems */
@media (min-width: 769px) {
    #problemsGridWrapper {
        max-height: min(60vh, 420px);
        overflow-y: auto;
        scroll-behavior: smooth;
        margin: 20px 0;
    }
}

#problemsGrid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 20px 0;
}

.problem {
    padding: 15px;
    border-radius: 8px;
    position: relative;
    overflow: hidden;
    background: var(--board-bg);
    background-size: 100% 20px;
    border: 3px solid var(--board-border);
    box-shadow: 
        inset 0 2px 4px rgba(0, 0, 0, 0.3),
        0 4px 6px rgba(0, 0, 0, 0.4);
    color: #FFF;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.8);
}

/* Print Friendly - hide board texture */
body.theme-print .problem {
    background: #F8F9FA;
    border: 2px solid #DEE2E6;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    color: #333;
    text-shadow: none;
}

body.theme-print .board-shatter::before {
    display: none; /* No shuriken in print mode */
}

.problem input {
    width: 100px;
    margin-left: 0;
    margin-top: 8px;
    border: 2px solid var(--primary-color); /* Ninja red border */
    border-radius: 4px;
    background: rgba(40, 40, 40, 0.8); /* Dark ninja background */
    color: #E0E0E0; /* Light text */
    font-family: 'Montserrat', sans-serif;
    padding: 5px;
    text-align: center;
    font-size: 16px;
    font-weight: bold;
    display: block;
}

#timer {
    font-weight: bold;
    margin: 10px 0;
    color: var(--primary-color); /* Ninja red timer */
    font-size: 18px;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
}

button {
    padding: 12px 24px;
    background: linear-gradient(45deg, #007bff, #0056b3);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

button:hover {
    background: linear-gradient(45deg, #0056b3, #004085);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

button:active {
    transform: translateY(0);
}

.start-timer-btn {
    background: linear-gradient(to right, var(--primary-color), var(--primary-red)) !important; /* Red ninja gradient */
    color: white !important;
    border: 2px solid var(--primary-color) !important;
    font-weight: bold !important;
    font-size: 16px !important;
    padding: 12px 24px !important;
    border-radius: 8px !important;
    cursor: pointer !important;
    transition: all 0.3s ease !important;
    box-shadow: 0 2px 4px rgba(234, 88, 12, 0.3) !important;
}

.start-timer-btn:hover {
    background: linear-gradient(to right, var(--primary-red), var(--primary-red)) !important; /* Lighter red gradient on hover */
    border-color: var(--primary-red) !important;
    transform: scale(1.05) !important; /* Ninja agility hover effect */
    box-shadow: 0 4px 8px rgba(234, 88, 12, 0.4) !important;
}

.print-btn {
    background: #6c757d !important;
    color: white !important;
    border: 2px solid #6c757d !important;
    font-weight: 500 !important;
    font-size: 14px !important;
    padding: 8px 16px !important;
    border-radius: 6px !important;
    cursor: pointer !important;
    transition: all 0.2s ease !important;
    margin-left: 10px !important;
}

.customize-btn {
    background: rgba(234, 88, 12, 0.2) !important;
    color: var(--text-color) !important;
    border: 2px solid rgba(234, 88, 12, 0.4) !important;
    font-weight: 500 !important;
    font-size: 14px !important;
    padding: 8px 16px !important;
    border-radius: 6px !important;
    cursor: pointer !important;
    transition: all 0.2s ease !important;
    font-family: var(--body-font) !important;
}

.customize-btn:hover {
    background: rgba(234, 88, 12, 0.3) !important;
    border-color: rgba(234, 88, 12, 0.6) !important;
    transform: translateY(-1px);
}

.customize-page-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 0 0 24px 0;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
}

.customize-header-icon {
    font-size: 1.35em;
    line-height: 1;
}

.retake-btn {
    background: #17a2b8 !important; /* Teal */
    color: white !important;
    border: 2px solid #17a2b8 !important;
    font-weight: 500 !important;
    font-size: 14px !important;
    padding: 8px 16px !important;
    border-radius: 6px !important;
    cursor: pointer !important;
    transition: all 0.2s ease !important;
    margin-left: 10px !important;
}

.retake-btn:hover {
    background: #138496 !important;
    border-color: #138496 !important;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(23, 162, 184, 0.3) !important;
}

.print-btn:hover {
    background: #5a6268 !important;
    border-color: #5a6268 !important;
    transform: translateY(-1px) !important;
}

.operation-buttons {
    display: flex;
    gap: 8px;
    margin: 10px 0;
}

.operation-btn {
    width: 50px;
    height: 50px;
    border: 2px solid var(--primary-color); /* Ninja red border */
    background: rgba(40, 40, 40, 0.8); /* Dark ninja background */
    border-radius: 8px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #E0E0E0; /* Light text */
    font-family: 'Montserrat', sans-serif;
    font-size: 16px;
}

.operation-btn:hover {
    border-color: var(--primary-red); /* Lighter red on hover */
    background: rgba(234, 88, 12, 0.2); /* Subtle red background */
    transform: scale(1.05); /* Ninja agility hover effect */
    box-shadow: 0 2px 4px rgba(234, 88, 12, 0.3);
}

.operation-btn.active {
    background: linear-gradient(to right, var(--primary-color), var(--primary-red)); /* Red ninja gradient */
    border-color: var(--primary-color);
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(234, 88, 12, 0.3);
}

.operation-btn:active {
    transform: translateY(0);
}

.problem-count-buttons {
    display: flex;
    gap: 8px;
    margin: 10px 0;
}

.count-btn {
    width: 50px;
    height: 50px;
    border: 2px solid #ddd;
    background: white;
    border-radius: 8px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #666;
    font-family: 'Montserrat', sans-serif;
}

.count-btn:hover {
    border-color: #007bff;
    background: #f8f9fa;
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.count-btn.active {
    background: #007bff;
    border-color: #007bff;
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0,123,255,0.3);
}

.count-btn:active {
    transform: translateY(0);
}

#customCountInput {
    margin-top: 10px;
}

#customCountInput input {
    width: 50px;
    height: 50px;
    padding: 0;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 12px;
    text-align: center;
    font-weight: bold;
}

#customCountInput input:focus {
    border-color: #007bff;
    outline: none;
    box-shadow: 0 0 0 3px rgba(0,123,255,0.1);
}

.range-selector {
    position: relative;
    display: inline-block;
}

.range-btn {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 200px;
    height: 50px;
    padding: 12px 16px;
    border: 2px solid #ddd;
    background: white;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 16px;
    font-weight: bold;
    color: #333 !important;
    margin-bottom: 15px;
    font-family: 'Montserrat', sans-serif;
}

#rangeDisplay, #rangeDisplayB {
    color: #333 !important;
    font-size: 16px !important;
    font-weight: bold !important;
    display: inline !important;
    visibility: visible !important;
    font-family: 'Montserrat', sans-serif !important;
}

.range-btn:hover {
    border-color: #007bff;
    background: #f8f9fa;
}

.dropdown-arrow {
    font-size: 12px;
    color: #666;
    transition: transform 0.2s ease;
}

.range-btn.open .dropdown-arrow {
    transform: rotate(180deg);
}

.range-popup {
    position: absolute;
    top: 100%;
    left: 0;
    z-index: 1000;
    background: white;
    border: 2px solid #ddd;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    margin-top: 4px;
    min-width: 300px;
}

.range-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 4px;
    padding: 16px;
}

.range-item {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid #ddd;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s ease;
    background: white;
    color: #333;
}

.range-item:hover {
    border-color: #007bff;
    background: #f8f9fa;
}

.range-item.selected {
    background: #007bff;
    border-color: #007bff;
    color: white;
}

.range-item.range-start {
    background: #003d82;
    border-color: #003d82;
    color: white;
}

.range-item.range-end {
    background: #003d82;
    border-color: #003d82;
    color: white;
}

.range-instructions {
    padding: 8px 16px;
    background: #f8f9fa;
    border-top: 1px solid #ddd;
    font-size: 12px;
    color: #666;
    text-align: center;
}

.range-toggle {
    margin: 20px 0;
}

.toggle-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: #333;
}

.toggle-label input[type="checkbox"] {
    display: none;
}

.toggle-slider {
    position: relative;
    width: 50px;
    height: 24px;
    background: #ccc;
    border-radius: 12px;
    margin-right: 12px;
    transition: background 0.3s ease;
}

.toggle-slider::before {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    transition: transform 0.3s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.toggle-label input[type="checkbox"]:checked + .toggle-slider {
    background: #007bff;
}

.toggle-label input[type="checkbox"]:checked + .toggle-slider::before {
    transform: translateX(26px);
}

.toggle-text {
    user-select: none;
    color: #E0E0E0; /* Light text for dark mode */
}

/* Theme and Font Selector Buttons */
.theme-buttons, .font-buttons {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin: 10px 0;
}

.theme-btn, .font-btn {
    padding: 10px 20px;
    border: 2px solid var(--primary-color);
    background: rgba(40, 40, 40, 0.8);
    color: #E0E0E0;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: 'Montserrat', sans-serif;
    font-size: 14px;
    font-weight: 500;
}

.theme-btn:hover, .font-btn:hover {
    background: rgba(234, 88, 12, 0.2);
    transform: translateY(-1px);
}

.theme-btn.active, .font-btn.active {
    background: var(--primary-gradient);
    border-color: var(--primary-color);
    color: white;
    box-shadow: 0 2px 4px rgba(234, 88, 12, 0.3);
}

/* Print Friendly theme button styles */
body.theme-print .theme-btn, 
body.theme-print .font-btn {
    border-color: #007bff;
    background: white;
    color: #333;
}

body.theme-print .theme-btn:hover, 
body.theme-print .font-btn:hover {
    background: #e7f3ff;
}

body.theme-print .theme-btn.active, 
body.theme-print .font-btn.active {
    background: linear-gradient(to right, #007bff, #0056b3);
    color: white;
}

.timer-options {
    margin: 10px 0;
    padding: 8px 0;
}

.timer-options .toggle-label {
    font-size: 14px;
    color: #333;
}

#secondRangeSelector {
    margin-top: 15px;
}

#secondRangeSelector label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #333;
}

/* Print-only header: hidden on screen, shown when printing. See NinjaNumbers.md for brand font. */
.print-header {
    display: none;
}

@media print {
    /* Prevent extra blank page: body shrinks to content, no full-page height */
    html, body {
        height: auto !important;
        min-height: 0 !important;
        margin: 0;
        padding: 0;
        color: black;
        background: white;
    }

    .main-nav,
    .site-footer,
    .hero-section,
    .mobile-nav-drawer,
    #cookieNotice,
    #feedbackFloatingActions,
    .demo-modal-overlay,
    .levels-login-modal-overlay,
    .mobile-expectations-overlay,
    .feedback-modal-overlay,
    .settings-modal-overlay,
    .tab-content:not(.active) {
        display: none !important;
    }

    .main-content-wrap {
        padding-top: 0 !important;
    }

    /* Print header: official Ninja Numbers brand font (Genos) – consistent with hero title */
    .print-header {
        display: block !important;
        font-family: 'Genos', sans-serif;
        font-weight: 700;
        font-size: 28px;
        line-height: 1.2;
        color: #000;
        margin: 0 0 12px 0;
        padding: 0;
        page-break-after: avoid;
    }

    /* Worksheet/section titles in print use same brand font */
    #problemsSection h2,
    .level-test-header,
    .level-test-header h1,
    .level-test-header h2 {
        font-family: 'Genos', sans-serif !important;
        font-weight: 700;
    }

    @page {
        margin: 0.5in;
        size: letter;
    }

    .problem {
        background: none !important;
        border: 1px solid #333 !important;
        box-shadow: none !important;
        color: #000 !important;
        text-shadow: none !important;
    }

    form, #startTimer, #gradeButton, #timer, button {
        display: none !important;
    }

    /* Results block only when it has content; avoid empty box adding height */
    #results:empty {
        display: none !important;
    }
    #results:not(:empty) {
        display: block !important;
        margin-top: 20px;
        padding: 15px;
        border: 2px solid #333;
        background: #f0f0f0;
        page-break-inside: avoid;
    }

    /* No max-height/overflow so content flows naturally and doesn't force a second page */
    .container {
        box-shadow: none;
        margin: 0;
        padding: 0;
        background: white;
        height: auto;
        max-height: none;
        overflow: visible;
    }

    #problemsSection {
        display: block;
        height: auto;
        max-height: none;
    }

    #problemsSection h2 {
        margin: 0 0 10px 0;
        font-size: 16px;
    }

    .print-settings {
        display: none;
        margin: 0 0 15px 0;
        padding: 10px;
        border: 1px solid #ddd;
        background: #f8f9fa;
        border-radius: 4px;
        font-size: 12px;
        line-height: 1.4;
    }

    @media print {
        .print-settings {
            display: block !important;
            margin: 0 0 15px 0;
            padding: 8px;
            border: 1px solid #ccc;
            background: #f9f9f9;
            font-size: 11px;
            line-height: 1.3;
            border-radius: 0;
        }
    }

    #problemsGridWrapper {
        max-height: none;
        overflow: visible;
    }

    #problemsGrid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
        margin: 0;
        height: auto;
        max-height: none;
        overflow: visible;
    }

    .problem {
        border: 1px solid #ccc;
        padding: 6px;
        margin: 0;
        font-size: 12px;
        line-height: 1.2;
        height: auto;
        min-height: 20px;
    }

    .problem input {
        display: none;
    }

    .answer {
        display: none;
    }

    /* For print with answers */
}

/* Ninja animations */
@keyframes shurikenStrike {
    0% { 
        transform: rotate(0deg) scale(1); 
        box-shadow: 0 0 0 rgba(234, 88, 12, 0.5);
    }
    25% { 
        transform: rotate(90deg) scale(1.1); 
        box-shadow: 0 0 15px rgba(234, 88, 12, 0.8);
    }
    50% { 
        transform: rotate(180deg) scale(1.2); 
        box-shadow: 0 0 20px rgba(234, 88, 12, 1);
    }
    75% { 
        transform: rotate(270deg) scale(1.1); 
        box-shadow: 0 0 15px rgba(234, 88, 12, 0.8);
    }
    100% { 
        transform: rotate(360deg) scale(1); 
        box-shadow: 0 0 0 rgba(234, 88, 12, 0.5);
    }
}

@keyframes ninjaFadeIn {
    from { 
        opacity: 0; 
        transform: translateY(10px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

/* Shuriken slash animation - flies through and disappears! */
@keyframes shurikenSlash {
    0% {
        transform: translate(-250%, -250%) rotate(0deg) scale(1);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    48% {
        transform: translate(-10%, -10%) rotate(350deg) scale(1);
        opacity: 1;
    }
    50% {
        transform: translate(0%, 0%) rotate(360deg) scale(1);
        opacity: 0;
    }
    100% {
        transform: translate(250%, 250%) rotate(720deg) scale(1);
        opacity: 0;
    }
}

/* PATTERN 1: Four Corners + Center */
@keyframes pieceFly-TL {
    0% { transform: translate(0, 0) rotate(0deg); opacity: 1; }
    100% { transform: translate(-180px, -180px) rotate(-120deg) scale(0.5); opacity: 0; }
}

@keyframes pieceFly-TR {
    0% { transform: translate(0, 0) rotate(0deg); opacity: 1; }
    100% { transform: translate(180px, -180px) rotate(120deg) scale(0.5); opacity: 0; }
}

@keyframes pieceFly-BL {
    0% { transform: translate(0, 0) rotate(0deg); opacity: 1; }
    100% { transform: translate(-180px, 180px) rotate(-240deg) scale(0.5); opacity: 0; }
}

@keyframes pieceFly-BR {
    0% { transform: translate(0, 0) rotate(0deg); opacity: 1; }
    100% { transform: translate(180px, 180px) rotate(240deg) scale(0.5); opacity: 0; }
}

@keyframes pieceFly-MC {
    0% { transform: translate(0, 0) scale(1); opacity: 1; }
    100% { transform: translate(0, -150px) scale(0.3); opacity: 0; }
}

/* PATTERN 2: Vertical Split (Left/Right) */
@keyframes pieceFly-LEFT {
    0% { transform: translateX(0) rotate(0deg); opacity: 1; }
    100% { transform: translateX(-250px) rotate(-180deg) translateY(80px) scale(0.4); opacity: 0; }
}

@keyframes pieceFly-RIGHT {
    0% { transform: translateX(0) rotate(0deg); opacity: 1; }
    100% { transform: translateX(250px) rotate(180deg) translateY(80px) scale(0.4); opacity: 0; }
}

/* PATTERN 3: Horizontal Split (Top/Bottom) */
@keyframes pieceFly-TOP {
    0% { transform: translateY(0) rotate(0deg); opacity: 1; }
    100% { transform: translateY(-200px) rotate(-90deg) translateX(60px) scale(0.4); opacity: 0; }
}

@keyframes pieceFly-BOTTOM {
    0% { transform: translateY(0) rotate(0deg); opacity: 1; }
    100% { transform: translateY(200px) rotate(90deg) translateX(-60px) scale(0.4); opacity: 0; }
}

/* PATTERN 4: Diagonal Explosion */
@keyframes pieceFly-DIAG1 {
    0% { transform: translate(0, 0) rotate(0deg); opacity: 1; }
    100% { transform: translate(-200px, -200px) rotate(-180deg) scale(0.3); opacity: 0; }
}

@keyframes pieceFly-DIAG2 {
    0% { transform: translate(0, 0) rotate(0deg); opacity: 1; }
    100% { transform: translate(200px, 200px) rotate(180deg) scale(0.3); opacity: 0; }
}

/* PATTERN 5: Scatter in all directions */
@keyframes pieceFly-N {
    0% { transform: translate(0, 0) rotate(0deg); opacity: 1; }
    100% { transform: translate(0, -220px) rotate(45deg) scale(0.4); opacity: 0; }
}

@keyframes pieceFly-NE {
    0% { transform: translate(0, 0) rotate(0deg); opacity: 1; }
    100% { transform: translate(160px, -160px) rotate(90deg) scale(0.4); opacity: 0; }
}

@keyframes pieceFly-E {
    0% { transform: translate(0, 0) rotate(0deg); opacity: 1; }
    100% { transform: translate(220px, 0) rotate(135deg) scale(0.4); opacity: 0; }
}

@keyframes pieceFly-SE {
    0% { transform: translate(0, 0) rotate(0deg); opacity: 1; }
    100% { transform: translate(160px, 160px) rotate(180deg) scale(0.4); opacity: 0; }
}

@keyframes pieceFly-S {
    0% { transform: translate(0, 0) rotate(0deg); opacity: 1; }
    100% { transform: translate(0, 220px) rotate(225deg) scale(0.4); opacity: 0; }
}

@keyframes pieceFly-SW {
    0% { transform: translate(0, 0) rotate(0deg); opacity: 1; }
    100% { transform: translate(-160px, 160px) rotate(270deg) scale(0.4); opacity: 0; }
}

@keyframes pieceFly-W {
    0% { transform: translate(0, 0) rotate(0deg); opacity: 1; }
    100% { transform: translate(-220px, 0) rotate(315deg) scale(0.4); opacity: 0; }
}

@keyframes pieceFly-NW {
    0% { transform: translate(0, 0) rotate(0deg); opacity: 1; }
    100% { transform: translate(-160px, -160px) rotate(360deg) scale(0.4); opacity: 0; }
}

@keyframes ninjaMiss {
    0% { 
        transform: translateX(0); 
        box-shadow: 0 0 0 rgba(220, 53, 69, 0.5);
    }
    25% { 
        transform: translateX(-6px); 
        box-shadow: 0 0 12px rgba(220, 53, 69, 0.8);
    }
    50% { 
        transform: translateX(6px); 
        box-shadow: 0 0 16px rgba(220, 53, 69, 1);
    }
    75% { 
        transform: translateX(-3px); 
        box-shadow: 0 0 12px rgba(220, 53, 69, 0.8);
    }
    100% { 
        transform: translateX(0); 
        box-shadow: 0 0 0 rgba(220, 53, 69, 0.5);
    }
}

.shuriken-strike {
    animation: shurikenStrike 0.8s ease-out;
    position: relative;
    z-index: 10;
    opacity: 1 !important;
    visibility: visible !important;
}

.ninja-miss {
    animation: ninjaMiss 0.6s ease-out;
    position: relative;
    z-index: 10;
    opacity: 1 !important;
    visibility: visible !important;
}

.ninja-fade-in {
    animation: ninjaFadeIn 0.3s ease-out;
}

.board-shatter {
    position: relative;
    pointer-events: none;
}

/* Shuriken - 4-blade ninja star! */
.board-shatter::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100px;
    height: 100px;
    margin-left: -50px;
    margin-top: -50px;
    background: 
        radial-gradient(circle at center, #E8E8E8 0%, #E8E8E8 15%, transparent 15%, transparent 30%, #D3D3D3 30%, #D3D3D3 35%, transparent 35%),
        conic-gradient(from 0deg at 50% 50%, 
            transparent 0deg, 
            transparent 35deg,
            #2C2C2C 35deg, 
            #2C2C2C 55deg, 
            transparent 55deg,
            transparent 90deg),
        conic-gradient(from 90deg at 50% 50%, 
            transparent 0deg, 
            transparent 35deg,
            #2C2C2C 35deg, 
            #2C2C2C 55deg, 
            transparent 55deg,
            transparent 90deg),
        conic-gradient(from 180deg at 50% 50%, 
            transparent 0deg, 
            transparent 35deg,
            #2C2C2C 35deg, 
            #2C2C2C 55deg, 
            transparent 55deg,
            transparent 90deg),
        conic-gradient(from 270deg at 50% 50%, 
            transparent 0deg, 
            transparent 35deg,
            #2C2C2C 35deg, 
            #2C2C2C 55deg, 
            transparent 55deg,
            transparent 90deg);
    background-size: 100% 100%;
    box-shadow: 
        0 0 20px rgba(255, 255, 255, 0.5),
        0 0 40px rgba(192, 192, 192, 0.3),
        inset 0 0 10px rgba(255, 255, 255, 0.2);
    z-index: 100;
    animation: shurikenSlash 0.5s ease-out;
    pointer-events: none;
    filter: drop-shadow(0 0 15px rgba(255, 255, 255, 0.8));
}

.flying-piece {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 5;
}

.print-answers .answer {
    display: inline;
    font-weight: bold;
}

/* Level Selection Styles */
.level-track-picker {
    margin-bottom: 20px;
    padding: 12px 0;
}

.track-picker-label {
    display: block;
    font-size: 0.95em;
    color: var(--text-color);
    opacity: 0.9;
    margin-bottom: 10px;
}

.track-picker-buttons {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.track-picker-btn {
    width: 56px;
    height: 56px;
    font-size: 1.8em;
    font-weight: bold;
    border: 2px solid var(--belt-color, var(--container-border));
    border-radius: 10px;
    background: color-mix(in srgb, var(--belt-color, var(--container-bg)) 14%, var(--container-bg));
    color: var(--text-color);
    cursor: pointer;
    transition: transform 0.2s, border-color 0.2s, background 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.track-picker-btn:hover:not(.track-picker-btn-disabled) {
    border-color: var(--belt-color, var(--primary-color));
    background: color-mix(in srgb, var(--belt-color, var(--primary-color)) 28%, var(--container-bg));
    transform: scale(1.05);
}

.track-picker-btn.active {
    border-color: var(--belt-color, var(--primary-color));
    background: var(--belt-color, var(--primary-gradient));
    color: white;
}
.track-picker-btn.active[data-operation="add"] {
    color: #1a1a1a;
}

.track-picker-btn-disabled,
.track-picker-btn.track-picker-locked {
    opacity: 0.5;
    cursor: not-allowed;
    filter: grayscale(0.7);
}

.track-picker-btn.track-picker-locked:disabled {
    pointer-events: none;
}

.track-picker-mixed {
    font-size: 1.4em;
    font-weight: bold;
}

/* Black Belt (?) level tooltip: hover + click to show */
.mixed-track-wrap {
    position: relative;
    display: inline-flex;
}

.mixed-track-tooltip {
    position: absolute;
    bottom: calc(100% + 10px);
    left: 50%;
    transform: translateX(-50%);
    width: 260px;
    padding: 12px 14px;
    font-size: 0.9em;
    line-height: 1.4;
    color: var(--text-color);
    background: var(--container-bg);
    border: 2px solid var(--container-border);
    border-radius: 10px;
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
    z-index: 1001;
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease;
}

.mixed-track-wrap:hover .mixed-track-tooltip,
.mixed-track-wrap.mixed-tooltip-open .mixed-track-tooltip {
    opacity: 1;
    visibility: visible;
}

.mixed-track-tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -8px;
    border: 8px solid transparent;
    border-top-color: var(--container-border);
}

#levelsGrid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

/* Progress page – all belts and what's left to do */
#progressSection {
    max-width: 720px;
    margin: 0 auto;
}

#progressSection h2 {
    margin-bottom: 0.25em;
}

.progress-section-intro {
    color: var(--muted-text);
    margin-bottom: 20px;
    font-size: 0.95em;
}

.progress-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 24px;
    padding: 16px;
    background: var(--container-bg);
    border: 1px solid var(--container-border);
    border-radius: 10px;
}

.progress-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 80px;
}

.progress-stat-value {
    font-size: 1.5em;
    font-weight: 700;
    color: var(--primary-color);
}

.progress-stat-label {
    font-size: 0.8em;
    color: var(--muted-text);
    text-align: center;
}

.progress-stats-hint {
    margin: 0;
    font-size: 0.9em;
    color: var(--muted-text);
}

.progress-belts-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.progress-belt-card {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 20px;
    background: var(--container-bg);
    border: 2px solid var(--container-border);
    border-radius: 10px;
    border-left-width: 5px;
}

.progress-belt-card.earned {
    border-left-color: var(--belt-color, var(--primary-color));
    background: var(--belt-color);
    border-color: var(--belt-color);
    box-shadow: 0 0 20px color-mix(in srgb, var(--belt-color) 45%, transparent),
                0 0 40px color-mix(in srgb, var(--belt-color) 25%, transparent);
    --progress-card-text: #fff;
    --progress-card-muted: rgba(255, 255, 255, 0.85);
}

.progress-belt-card.earned.progress-belt-card--light {
    --progress-card-text: #1a1a1a;
    --progress-card-muted: rgba(0, 0, 0, 0.7);
}

.progress-belt-card.earned .progress-belt-name,
.progress-belt-card.earned .progress-belt-track,
.progress-belt-card.earned .progress-belt-next {
    color: var(--progress-card-text);
}

.progress-belt-card.earned .progress-belt-track {
    color: var(--progress-card-muted);
}

.progress-belt-card.earned .progress-level-cell {
    color: var(--progress-card-text);
    border-color: var(--progress-card-muted);
}

.progress-belt-card.earned .progress-level-cell {
    background: rgba(255, 255, 255, 0.2);
}

.progress-belt-card.earned.progress-belt-card--light .progress-level-cell {
    background: rgba(0, 0, 0, 0.08);
}

.progress-belt-card.earned .progress-level-cell.locked {
    opacity: 0.6;
}

.progress-belt-card.locked {
    opacity: 0.85;
    border-left-color: var(--container-border);
}

.progress-belt-icon-wrap {
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    --belt-color: #6b7280;
}

.progress-belt-icon {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6em;
    background: var(--belt-color);
    color: #fff;
    border: 2px solid var(--belt-color);
}

.progress-belt-card.earned .progress-belt-icon {
    box-shadow: 0 0 12px var(--belt-color), 0 0 24px color-mix(in srgb, var(--belt-color) 60%, transparent);
}

.progress-belt-card.locked .progress-belt-icon {
    background: transparent;
    color: var(--belt-color);
}

.progress-belt-stripes {
    display: flex;
    flex-direction: column;
    gap: 2px;
    align-items: center;
}

.progress-belt-body {
    flex: 1;
    min-width: 0;
}

.progress-belt-name {
    margin: 0 0 4px 0;
    font-size: 1.2em;
    color: var(--text-color);
}

.progress-belt-track {
    margin: 0 0 8px 0;
    font-size: 0.9em;
    color: var(--muted-text);
}

.progress-level-map {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin: 12px 0;
}

.progress-level-cell {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    min-width: 28px;
    padding: 4px 6px;
    font-size: 0.75em;
    font-weight: 600;
    color: var(--text-color);
    border: 1px solid var(--container-border);
    border-radius: 6px;
    background: var(--container-bg);
}

.progress-level-cell.unlocked {
    border-color: color-mix(in srgb, var(--belt-color, var(--primary-color)) 50%, var(--container-border));
}

.progress-level-cell.locked {
    opacity: 0.6;
}

.progress-level-cell--clickable {
    cursor: pointer;
}

.progress-level-cell--clickable:hover {
    border-color: var(--belt-color, var(--primary-color));
    background: color-mix(in srgb, var(--belt-color, var(--primary-color)) 12%, var(--container-bg));
}

.progress-level-stars {
    font-size: 0.85em;
    letter-spacing: -1px;
    margin-top: 2px;
}

.progress-belt-next {
    margin: 0;
    font-size: 0.95em;
    color: var(--text-color);
    line-height: 1.4;
}

.progress-loading,
.progress-error {
    padding: 24px;
    text-align: center;
    color: var(--muted-text);
}

.progress-error {
    color: var(--primary-red, #DC2626);
}

/* Level cards: less polished, ninja vibe – scroll/dojo feel */
.level-card {
    background: var(--container-bg);
    border: 2px solid var(--container-border);
    border-radius: 6px;
    border-left-width: 4px;
    padding: 20px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.level-card.unlocked {
    cursor: pointer;
    border-color: rgba(234, 88, 12, 0.5);
    border-left-color: var(--belt-color, var(--primary-color));
}

#levelsSection .level-card.unlocked {
    border-color: color-mix(in srgb, var(--belt-color) 45%, var(--container-border));
    border-left-color: var(--belt-color);
}

.level-card.unlocked:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(234, 88, 12, 0.25);
}

#levelsSection .level-card.unlocked:hover {
    box-shadow: 0 6px 20px color-mix(in srgb, var(--belt-color) 30%, transparent);
}

.level-card.locked {
    opacity: 0.65;
    border-color: #3d3d3d;
    border-left-color: #4a4a4a;
}

/* Black Belt locked: big ? mystery, no description until unlocked */
.level-card--black-belt-locked .level-black-belt-mystery {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 5rem;
    font-weight: bold;
    color: var(--text-color);
    opacity: 0.5;
    margin: 20px 0;
    line-height: 1;
}
.level-card--black-belt-locked .level-locked-msg {
    margin-top: 8px;
    text-align: center;
    font-size: 0.9em;
}
.level-card--black-belt-locked .level-header h3 {
    color: var(--text-color);
}
.level-card--black-belt-locked.level-card.locked {
    opacity: 0.85;
}

.level-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.level-header h3 {
    margin: 0;
    font-size: 1.2em;
    color: var(--text-color);
}

.level-stars {
    font-size: 1.5em;
}

.level-description {
    color: var(--text-color);
    opacity: 0.8;
    margin: 10px 0;
    font-size: 0.9em;
}

.level-range,
.level-problems {
    color: var(--text-color);
    opacity: 0.7;
    margin: 5px 0;
    font-size: 0.85em;
}

.level-start-btn {
    width: 100%;
    padding: 12px;
    margin-top: 15px;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

#levelsSection .level-start-btn {
    background: linear-gradient(145deg, var(--belt-color), color-mix(in srgb, var(--belt-color) 75%, #1a1a1a));
    color: var(--belt-btn-text, white);
}

.level-start-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(234, 88, 12, 0.4);
}

#levelsSection .level-start-btn:hover {
    box-shadow: 0 5px 15px color-mix(in srgb, var(--belt-color) 45%, transparent);
}

/* Replay (completed) level: blue; Start (latest) level stays red via .level-start-btn */
.level-start-btn-replay {
    background: linear-gradient(to right, #2563eb, #1d4ed8);
    color: white;
}

.level-start-btn-replay:hover {
    box-shadow: 0 5px 15px rgba(37, 99, 235, 0.4);
}

.level-locked-msg {
    text-align: center;
    color: var(--text-color);
    opacity: 0.6;
    margin-top: 15px;
    font-style: italic;
}

/* Requirements: scroll-stripe accent, ninja palette */
.level-requirements {
    margin: 15px 0;
    padding: 12px 12px 12px 14px;
    background: rgba(30, 30, 30, 0.6);
    border-radius: 4px;
    border: 1px solid rgba(64, 64, 64, 0.8);
    border-left: 4px solid var(--primary-color);
}

#levelsSection .level-requirements {
    border-left-color: var(--belt-color);
}

.requirements-title {
    font-weight: bold;
    color: var(--text-color);
    margin-bottom: 8px;
    font-size: 0.9em;
}

.requirement-item {
    display: flex;
    align-items: center;
    margin: 6px 0;
    font-size: 0.85em;
}

.req-stars {
    min-width: 50px;
    font-size: 1.1em;
    margin-right: 10px;
}

.req-text {
    color: var(--text-color);
    opacity: 0.9;
}

/* Track Progress Bar - Top of Levels Page (border uses belt color from JS) */
.track-progress-bar-top {
    margin: 20px 0 30px 0;
    padding: 20px;
    background: color-mix(in srgb, var(--belt-color, rgba(234, 88, 12, 0.5)) 10%, var(--container-bg, rgba(255,255,255,0.05)));
    border-radius: 8px;
    border: 2px solid var(--belt-color, rgba(234, 88, 12, 0.3));
}

.track-progress-label {
    font-size: 1em;
    color: var(--text-color);
    opacity: 0.9;
    margin-bottom: 15px;
    font-weight: bold;
    text-align: center;
}

.track-progress-circles {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Shuriken (ninja star) progress indicators */
.progress-circle {
    width: 48px;
    height: 48px;
    /* 4-point shuriken shape */
    clip-path: polygon(50% 0%, 65% 35%, 100% 50%, 65% 65%, 50% 100%, 35% 65%, 0% 50%, 35% 35%);
    -webkit-clip-path: polygon(50% 0%, 65% 35%, 100% 50%, 65% 65%, 50% 100%, 35% 65%, 0% 50%, 35% 35%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1em;
    font-weight: bold;
    transition: transform 0.2s, box-shadow 0.2s, filter 0.2s;
}

.progress-circle.locked {
    background: linear-gradient(145deg, #5a6268 0%, #6c757d 50%, #5a6268 100%);
    color: rgba(255, 255, 255, 0.9);
    opacity: 0.7;
}

/* Next level to play: red/orange to match Start Level button; in levels section uses belt color */
.progress-circle.unlocked {
    background: linear-gradient(145deg, #ea580c 0%, #dc2626 50%, #b91c1c 100%);
    color: white;
    box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.2) inset;
}

.track-progress-bar-top .progress-circle.unlocked {
    background: linear-gradient(145deg, var(--belt-color), color-mix(in srgb, var(--belt-color) 80%, #1a1a1a));
    color: white;
}

.track-progress-bar-top[data-operation="add"] .progress-circle.unlocked {
    color: #1a1a1a;
}

/* Completed level: blue to match Replay button */
.progress-circle.completed {
    background: linear-gradient(145deg, #2563eb 0%, #1d4ed8 50%, #1e40af 100%);
    color: white;
    font-size: 0.75em;
    padding: 2px;
    line-height: 1;
    box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.25) inset;
}

.progress-circle:hover {
    transform: scale(1.12) rotate(5deg);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.35);
}

/* Level Test Container (within Levels tab) */
.level-test-container {
    display: none;
    margin-top: 20px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 25px;
    border: 2px solid rgba(234, 88, 12, 0.3);
}

body.theme-print .level-test-container {
    background: #f8f9fa;
    border: 2px solid #dee2e6;
}

.level-test-header {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid rgba(234, 88, 12, 0.2);
}

/* Level Timer - actual time + 3-star and 2-star thresholds */
.level-timer {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.85);
    padding: 12px 16px;
    border-radius: 10px;
    border: 2px solid rgba(234, 88, 12, 0.45);
    min-width: 140px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.level-timer-time {
    font-size: 1.5rem;
    font-weight: 700;
    color: #fff;
    letter-spacing: 0.02em;
    margin-bottom: 10px;
    text-align: center;
    text-shadow: 0 0 8px rgba(255, 215, 0, 0.3);
}

.level-timer-thresholds {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.level-timer-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 4px 8px;
    background: rgba(255, 255, 255, 0.06);
    border-radius: 6px;
    transition: opacity 0.35s ease, transform 0.35s ease, max-height 0.35s ease, margin 0.35s ease, padding 0.35s ease;
}

.level-timer-row--past {
    opacity: 0;
    transform: scale(0.92);
    max-height: 0;
    margin: 0;
    padding: 0;
    overflow: hidden;
    pointer-events: none;
}

.level-timer-sec {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.85);
}

.level-timer-stars {
    font-size: 1rem;
    line-height: 1;
    text-shadow: 0 0 6px rgba(255, 215, 0, 0.5);
}

/* One star shown when past 2-star time (replaces 2-star row) */
.level-timer-one-star {
    text-align: center;
    font-size: 1.25rem;
    margin-top: 6px;
    opacity: 0;
    max-height: 0;
    overflow: hidden;
    transition: opacity 0.35s ease, max-height 0.35s ease, margin 0.35s ease;
    text-shadow: 0 0 6px rgba(255, 215, 0, 0.5);
}

.level-timer-one-star--visible {
    opacity: 1;
    max-height: 2em;
    margin-top: 8px;
}

.level-problems-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 30px 0;
    padding: 20px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 10px;
}

body.theme-print .level-problems-grid {
    background: #ffffff;
    border: 1px solid #e9ecef;
}

.level-problems-grid .problem {
    /* Inherit all problem styles from main problems grid */
    background: var(--board-bg);
    border: 3px solid var(--board-border);
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.level-grade-button {
    width: 100%;
    padding: 18px;
    font-size: 20px;
    font-weight: bold;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    margin: 30px 0 20px 0;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 12px rgba(234, 88, 12, 0.3);
}

.level-grade-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(234, 88, 12, 0.5);
}

.level-grade-button:active {
    transform: translateY(0);
}

.level-results {
    margin-top: 20px;
    padding: 25px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    border: 2px solid rgba(234, 88, 12, 0.3);
}

/* Hide empty results area so it doesn’t show as a bar below Grade Answers on first load */
.level-results:empty {
    display: none;
}

body.theme-print .level-results {
    background: #ffffff;
    border: 2px solid #dee2e6;
}

/* Level Selection Collapsible */
.level-selection-header {
    margin-bottom: 10px;
}

.toggle-level-selection-btn {
    width: 100%;
    padding: 12px;
    border-radius: 8px;
    border: 2px solid rgba(139, 0, 0, 0.4);
    background: rgba(139, 0, 0, 0.2);
    color: var(--text-color);
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.2s, border-color 0.2s, transform 0.1s;
}

#levelsSection .toggle-level-selection-btn {
    border-color: color-mix(in srgb, var(--belt-color, #8B0000) 60%, transparent);
    background: color-mix(in srgb, var(--belt-color, #8B0000) 18%, transparent);
}

.toggle-level-selection-btn:hover {
    background: rgba(234, 88, 12, 0.3) !important;
    transform: scale(1.02);
}

#levelsSection .toggle-level-selection-btn:hover {
    background: color-mix(in srgb, var(--belt-color, #8B0000) 28%, transparent) !important;
    border-color: var(--belt-color, rgba(139, 0, 0, 0.4));
}

.toggle-level-selection-btn:active {
    transform: scale(0.98);
}

.level-selection-content {
    display: block; /* Start expanded */
    margin-bottom: 15px;
}

/* Make progress bar more compact */
.level-selection-content .track-progress-bar-top {
    margin: 10px 0 15px 0;
    padding: 12px 15px;
}

.level-selection-content .track-progress-label {
    font-size: 0.9em;
    margin-bottom: 10px;
}

.level-selection-content .progress-circle {
    width: 40px;
    height: 40px;
    font-size: 0.85em;
}

.level-selection-content .progress-circle.completed {
    font-size: 0.7em;
}

/* Make level cards grid more compact when in collapsible */
.level-selection-content #levelsGrid {
    gap: 15px;
    margin-top: 15px;
}

.level-selection-content .level-card {
    padding: 15px;
}

/* Countdown Animation */
.countdown-overlay {
    animation: countdownPulse 0.5s ease-in-out;
}

@keyframes countdownPulse {
    0% {
        transform: scale(0.5);
        opacity: 0;
    }
    50% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

/* Results Modal */
.results-modal-overlay {
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.results-modal-content {
    animation: slideUp 0.3s ease-out;
}

/* Challenge complete modal: share row */
.challenge-complete-share {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.challenge-complete-share .results-modal-btn,
.challenge-complete-share .challenge-share-btn,
.challenge-complete-share a[href^="https://twitter.com"],
.challenge-complete-share a[href^="https://www.facebook.com"] {
    flex-shrink: 0;
}
.challenge-share-btn {
    transition: transform 0.2s ease, opacity 0.2s ease;
}
.challenge-share-btn:hover {
    transform: scale(1.05);
    opacity: 0.95;
}
.challenge-share-btn:focus {
    outline: 2px solid var(--primary-color, #ea580c);
    outline-offset: 2px;
}
.challenge-share-icon {
    display: block;
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}
@media (max-width: 480px) {
    .challenge-complete-share > div:last-child {
        flex-direction: column;
        align-items: stretch;
    }
    .challenge-share-btn {
        justify-content: center;
    }
}

@keyframes slideUp {
    from {
        transform: translateY(30px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Results modal: avatar celebration (smile / bounce) */
.results-avatar-wrap {
    animation: resultsAvatarCelebrate 0.6s ease-out;
}

@keyframes resultsAvatarCelebrate {
    0% { transform: scale(0.8); opacity: 0; }
    50% { transform: scale(1.15); }
    100% { transform: scale(1); opacity: 1; }
}

/* Belt tease on level 9 card */
.level-belt-tease {
    font-size: 0.95em;
    color: var(--belt-color, var(--primary-color));
    font-weight: 600;
    margin: 10px 0 !important;
}

/* Auth UI Styles */
.auth-container {
    margin-bottom: 20px;
    padding: 15px;
    background: rgba(234, 88, 12, 0.1);
    border: 1px solid rgba(234, 88, 12, 0.3);
    border-radius: 8px;
}

.auth-user-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.user-greeting {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.1em;
}

.user-greeting-profile {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    font: inherit;
    color: inherit;
}

.user-greeting-profile:hover {
    opacity: 0.9;
}

.user-greeting-profile .user-name {
    font-weight: 600;
    color: var(--text-color);
}

.user-icon {
    font-size: 1.3em;
}

.user-name {
    font-weight: 600;
    color: var(--text-color);
}

.settings-gear-btn {
    background: transparent;
    border: none;
    font-size: 1.2em;
    cursor: pointer;
    padding: 4px 8px;
    margin-left: 8px;
    opacity: 0.7;
    transition: opacity 0.2s, transform 0.2s;
    color: var(--text-color);
}

.settings-gear-btn:hover {
    opacity: 1;
    transform: rotate(90deg);
}

.settings-gear-btn:active {
    transform: rotate(90deg) scale(0.95);
}

/* Settings Modal */
.settings-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease-in;
}

.settings-modal-content {
    background: #282828;
    border: 2px solid var(--container-border);
    border-radius: 12px;
    padding: 25px;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    animation: slideUp 0.3s ease-out;
}

/* Print theme - white background for settings */
body.theme-print .settings-modal-content {
    background: #FFFFFF;
}

.settings-modal-content h3 {
    margin-top: 0;
    margin-bottom: 20px;
    color: var(--primary-color);
    font-size: 1.5em;
}

.settings-modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    background: rgba(234, 88, 12, 0.1);
    border: 1px solid rgba(234, 88, 12, 0.3);
    color: var(--text-color);
    width: 30px;
    height: 30px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2em;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.settings-modal-close:hover {
    background: rgba(234, 88, 12, 0.2);
    transform: scale(1.1);
}

/* Avatar Picker - Compact Grid Layout */
.avatar-picker {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.avatar-picker-section {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.avatar-section-label {
    font-size: 0.9em;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 5px;
}

.avatar-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 8px;
    margin-bottom: 10px;
}

.avatar-option {
    position: relative;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    transition: all 0.2s ease;
    padding: 4px;
}

.avatar-option:hover {
    background: rgba(234, 88, 12, 0.2);
    transform: scale(1.1);
}

.avatar-option input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.avatar-option input[type="radio"]:checked + .avatar-preview {
    border: 3px solid var(--primary-color);
    box-shadow: 0 0 10px rgba(234, 88, 12, 0.5);
    transform: scale(1.1);
}

.avatar-preview {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 2px solid transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    background: rgba(255, 255, 255, 0.1);
}

.avatar-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

/* Make settings form more compact */
.settings-modal-content .form-group {
    margin-bottom: 15px;
}

.settings-modal-content .form-group:last-of-type {
    margin-bottom: 20px;
}

/* Responsive: fewer columns on smaller screens */
@media (max-width: 600px) {
    .avatar-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .settings-modal-content {
        padding: 20px;
        max-width: 95%;
    }
}

.auth-forms-container {
    max-width: 400px;
}

.auth-section {
    margin-bottom: 20px;
}

.auth-section h3 {
    margin: 0 0 15px 0;
    color: var(--text-color);
    font-size: 1.3em;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.form-group label {
    font-size: 0.9em;
    color: var(--text-color);
    font-weight: 500;
}

.form-group input {
    padding: 10px;
    border: 1px solid rgba(234, 88, 12, 0.3);
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-color);
    font-size: 1em;
    font-family: inherit;
}

.form-group input:focus {
    outline: none;
    border-color: rgba(234, 88, 12, 0.6);
    background: rgba(255, 255, 255, 0.15);
}

.error-message {
    padding: 10px;
    background: rgba(220, 53, 69, 0.2);
    border: 1px solid rgba(220, 53, 69, 0.5);
    border-radius: 4px;
    color: #dc3545;
    font-size: 0.9em;
}

.auth-btn {
    padding: 12px 20px;
    border: none;
    border-radius: 4px;
    font-size: 1em;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 500;
}

.auth-btn.primary {
    background: rgba(234, 88, 12, 0.7);
    color: white;
}

.auth-btn.primary:hover {
    background: rgba(234, 88, 12, 0.9);
}

.auth-btn.secondary {
    background: rgba(234, 88, 12, 0.2);
    color: var(--text-color);
    border: 1px solid rgba(234, 88, 12, 0.4);
}

.auth-btn.secondary:hover {
    background: rgba(234, 88, 12, 0.3);
}

.sign-in-choice-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 12px 0;
}

.sign-in-choice-row .auth-btn {
    flex: 1;
    min-width: 120px;
}

.sign-in-password-row {
    margin-top: 8px;
}

.auth-forgot-wrap {
    margin: 4px 0 12px 0;
}

.auth-forgot-link {
    font-size: 0.75em;
    color: var(--text-color);
    opacity: 0.85;
}

.auth-forgot-link:hover {
    opacity: 1;
    text-decoration: underline;
}

.sign-in-link-success {
    font-size: 0.85em;
    margin-bottom: 10px;
}

.forgot-password-modal .forgot-password-title {
    font-size: 0.95em;
    margin-bottom: 8px;
}

.forgot-password-modal .forgot-password-desc {
    font-size: 0.8em;
    color: #666;
    margin-bottom: 12px;
}

.forgot-password-modal .forgot-password-success {
    font-size: 0.8em;
    color: #10B981;
    margin-bottom: 10px;
}

.auth-btn.google-btn {
    background: rgba(255, 255, 255, 0.1);
    color: #4285F4; /* Google blue */
    border: 1px solid rgba(234, 88, 12, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.auth-btn.google-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    color: #357AE8; /* Slightly darker blue on hover */
}

.auth-btn.google-btn span {
    color: #4285F4; /* Ensure text is blue */
}

.auth-btn.google-btn:hover span {
    color: #357AE8; /* Darker blue on hover */
}

.auth-btn.sign-out-btn {
    background: rgba(234, 88, 12, 0.3);
    color: var(--text-color);
    border: 1px solid rgba(234, 88, 12, 0.4);
}

.auth-btn.sign-out-btn:hover {
    background: rgba(234, 88, 12, 0.5);
}

.auth-switch {
    text-align: center;
    margin: 10px 0 0 0;
    font-size: 0.9em;
    color: var(--text-color);
}

.auth-switch a {
    color: rgba(234, 88, 12, 0.8);
    text-decoration: none;
    font-weight: 600;
}

.auth-switch a:hover {
    text-decoration: underline;
}

/* Leaderboard Styles */
.leaderboard-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
    background: var(--container-bg);
    border-radius: 8px;
    overflow: hidden;
}

.leaderboard-table thead {
    background: rgba(234, 88, 12, 0.2);
}

.leaderboard-table th {
    padding: 12px;
    text-align: left;
    font-weight: bold;
    color: var(--primary-color);
    border-bottom: 2px solid var(--container-border);
}

.leaderboard-table td {
    padding: 12px;
    border-bottom: 1px solid rgba(234, 88, 12, 0.1);
}

.leaderboard-table tbody tr:hover {
    background: rgba(234, 88, 12, 0.05);
}

.leaderboard-row-current-user {
    background: rgba(234, 88, 12, 0.15) !important;
    font-weight: bold;
}

.leaderboard-row-current-user:hover {
    background: rgba(234, 88, 12, 0.2) !important;
}

/* Leaderboard Difficulty Tabs */
.leaderboard-difficulty-tabs {
    display: flex;
    gap: 10px;
    margin: 20px 0;
    border-bottom: 2px solid var(--container-border);
    padding-bottom: 10px;
}

.leaderboard-tab-btn {
    background: transparent;
    border: 2px solid var(--container-border);
    color: var(--text-color);
    padding: 10px 20px;
    border-radius: 8px 8px 0 0;
    cursor: pointer;
    font-size: 1em;
    font-weight: 600;
    transition: all 0.2s ease;
    font-family: var(--body-font);
    margin-bottom: -2px;
}

.leaderboard-tab-btn:hover {
    background: rgba(234, 88, 12, 0.2);
    border-color: var(--primary-color);
}

.leaderboard-tab-btn.active {
    background: var(--primary-gradient);
    border-color: var(--primary-color);
    color: white;
    border-bottom-color: var(--container-bg);
}

/* Leaderboard Test Button */
.leaderboard-test-btn {
    background: var(--primary-gradient);
    color: white;
    border: 2px solid var(--primary-color);
    padding: 12px 30px;
    border-radius: 8px;
    font-size: 1.1em;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(234, 88, 12, 0.4);
    font-family: var(--body-font);
}

.leaderboard-test-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(234, 88, 12, 0.6);
    background: linear-gradient(to right, var(--primary-red), var(--primary-red));
}

/* Compete tab: container for test runner when "Take Test" runs in-place */
.leaderboard-test-runner {
    margin-top: 0.5rem;
}

/* Your result when not in top 20 */
.leaderboard-your-result {
    margin-top: 1.25rem;
    padding: 12px 16px;
    background: var(--container-bg);
    border: 1px solid rgba(234, 88, 12, 0.3);
    border-radius: 8px;
    font-size: 1em;
    text-align: center;
}

/* Dojo Grid – multiplication fact mastery */
#dojoGridSection h2 {
    margin-top: 0;
}
.dojo-grid-intro {
    margin-bottom: 0.5rem;
    color: var(--muted-text);
    font-size: 0.95em;
}
.dojo-grid-intro.dojo-grid-hint {
    margin-top: 0.75rem;
    margin-bottom: 1rem;
}
.dojo-grid-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem 1.25rem;
    align-items: center;
    margin: 0.5rem 0 0;
}
.dojo-legend-item {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.9em;
    color: var(--muted-text);
}
.dojo-legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}
.dojo-legend-mastered .dojo-legend-dot { background: #22c55e; }
.dojo-legend-practiced .dojo-legend-dot { background: #eab308; }
.dojo-legend-not-yet .dojo-legend-dot { background: var(--container-border); }
.dojo-grid-range-picker {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 1rem;
}
.dojo-grid-range-label {
    font-weight: 600;
    color: var(--text-color);
}
.dojo-range-btn {
    padding: 8px 16px;
    border: 2px solid var(--container-border);
    border-radius: 8px;
    background: var(--container-bg);
    color: var(--text-color);
    font-weight: 600;
    cursor: pointer;
}
.dojo-range-btn:hover {
    border-color: var(--primary-color);
    background: rgba(234, 88, 12, 0.1);
}
.dojo-range-btn.active {
    border-color: var(--primary-color);
    background: rgba(234, 88, 12, 0.2);
    color: var(--primary-color);
}
.dojo-grid-container {
    overflow-x: auto;
    margin-bottom: 1rem;
}
.dojo-grid-table {
    border-collapse: collapse;
    font-size: clamp(0.7rem, 2.5vw, 0.95rem);
    min-width: 200px;
}
.dojo-grid-table th,
.dojo-grid-table td {
    border: 1px solid var(--container-border);
    padding: 6px 8px;
    text-align: center;
}
.dojo-grid-table thead th {
    background: var(--muted-bg);
    font-weight: 700;
    color: var(--text-color);
}
.dojo-cell {
    font-weight: 600;
}
.dojo-cell-mastered {
    background: #166534;
    color: #fff;
}
.dojo-cell-practiced {
    background: #ca8a04;
    color: #1c1917;
}
.dojo-cell-none {
    background: var(--muted-bg);
    color: var(--muted-text);
}
.dojo-grid-empty,
.dojo-grid-signin-hint {
    color: var(--muted-text);
    font-size: 0.95em;
    margin-top: 1rem;
}
.dojo-grid-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    gap: 20px;
}
.dojo-grid-loading .loading-spinner {
    flex-shrink: 0;
}
.dojo-grid-loading .loading-text {
    margin: 0;
}

/* Dojo timed practice – dial buttons (click to turn ON one per row) */
.dojo-timed-practice-wrap {
    margin-top: 1.25rem;
    padding: 1rem 0;
    border-top: 1px solid var(--container-border);
}
.dojo-timed-presets,
.dojo-timed-duration {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 12px;
}
.dojo-timed-label {
    font-weight: 600;
    color: var(--text-color);
    min-width: 3.5em;
}
.dojo-preset-btn,
.dojo-time-btn {
    padding: 8px 14px;
    border: 2px solid var(--container-border);
    border-radius: 8px;
    background: var(--container-bg);
    color: var(--text-color);
    font-weight: 600;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s, color 0.15s;
}
.dojo-preset-btn:hover,
.dojo-time-btn:hover {
    border-color: var(--primary-color);
    background: rgba(234, 88, 12, 0.08);
}
.dojo-preset-btn.active,
.dojo-time-btn.active {
    border-color: var(--primary-color);
    background: rgba(234, 88, 12, 0.25);
    color: var(--primary-color);
}
.dojo-timed-start-btn {
    margin-top: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    background: var(--primary-gradient);
    color: #fff;
    font-weight: 700;
    cursor: pointer;
    font-size: 1em;
}
.dojo-timed-start-btn:hover {
    opacity: 0.95;
    transform: translateY(-1px);
}
.dojo-timed-message {
    margin-top: 10px;
    color: var(--muted-text);
    font-size: 0.9em;
}

.dojo-test-runner {
    margin-top: 1rem;
}
/* Dojo practice: problems as main focus, no page scroll */
.dojo-test-runner.dojo-practice-active {
    display: flex;
    flex-direction: column;
    min-height: 75vh;
}
#problemsSection.dojo-practice-active {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
}
#problemsSection.dojo-practice-active #problemsGridWrapper {
    flex: 1 1 0;
    min-height: 0;
    overflow: auto;
}
.dojo-more-problems-wrap {
    margin-top: 1rem;
    margin-bottom: 1rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem;
}
.dojo-more-problems-btn {
    padding: 10px 24px;
    font-size: 1rem;
    font-weight: 600;
    color: white;
    background: var(--primary-gradient);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}
.dojo-more-problems-btn:hover {
    opacity: 0.95;
    transform: translateY(-1px);
}
.dojo-end-training-btn {
    padding: 8px 16px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-color);
    background: var(--container-bg);
    border: 2px solid var(--container-border, rgba(255, 255, 255, 0.2));
    border-radius: 8px;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
}
.dojo-end-training-btn:hover {
    border-color: var(--primary-color);
    background: rgba(234, 88, 12, 0.08);
}

/* Loading Indicator for Levels */
.levels-loading-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    gap: 20px;
}

.levels-error-message {
    padding: 40px 20px;
    text-align: center;
    color: var(--muted-text, #a0a0a0);
}
.levels-error-message p {
    margin: 0 0 16px 0;
    font-size: 1rem;
}
.levels-error-retry-btn {
    padding: 10px 20px;
    font-size: 1rem;
    border-radius: 8px;
    border: 2px solid var(--primary-color);
    background: transparent;
    color: var(--primary-color);
    cursor: pointer;
    font-family: var(--body-font);
}
.levels-error-retry-btn:hover {
    background: rgba(234, 88, 12, 0.15);
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(234, 88, 12, 0.2);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loading-text {
    color: var(--text-color);
    font-size: 1.1em;
    font-weight: 500;
    margin: 0;
}

/* About Tab Styles */
.about-content {
    padding: 20px 0;
    line-height: 1.8;
    max-width: 700px;
}

.about-content p {
    margin: 15px 0;
    font-size: 1.1em;
}

.about-content h3 {
    margin: 28px 0 12px;
    font-size: 1.25em;
    color: var(--text-color);
}

.about-content h3:first-of-type {
    margin-top: 0;
}

/* Privacy link scroll target: keep "Data usage" visible below fixed nav */
#about-data-usage {
    scroll-margin-top: 72px;
}

.about-content a {
    color: var(--link-color, #7DD3FC);
    text-decoration: underline;
    font-weight: 600;
    transition: color 0.2s ease;
}

.about-content a:hover {
    color: var(--link-color-hover, #BAE6FD);
}

/* Why we built this — card layout */
.about-reasons {
    display: grid;
    gap: 14px;
    margin: 16px 0 24px;
}

.about-reason-card {
    padding: 14px 18px;
    border-radius: 10px;
    background: rgba(234, 88, 12, 0.08);
    border: 1px solid rgba(234, 88, 12, 0.2);
    font-size: 0.95em;
    line-height: 1.55;
}

.about-reason-card p {
    margin: 0;
    font-size: inherit;
}

.about-reason-title {
    display: block;
    font-weight: 700;
    font-size: 1em;
    color: var(--text-color);
    margin-bottom: 6px;
}

[data-theme="dark"] .about-reason-card,
.theme-print .about-reason-card {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.12);
}

/* How to use Ninja Numbers – same card look as "Why use" + header icon */
.about-how-cards {
    display: grid;
    gap: 14px;
    margin: 16px 0 24px;
}
.about-how-card {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 14px 18px;
    border-radius: 10px;
    background: rgba(234, 88, 12, 0.08);
    border: 1px solid rgba(234, 88, 12, 0.2);
    font-size: 0.95em;
    line-height: 1.55;
}
.about-how-icon {
    flex-shrink: 0;
    font-size: 1.5em;
    line-height: 1;
}
.about-how-body {
    flex: 1;
    min-width: 0;
}
.about-how-title {
    display: block;
    font-weight: 700;
    font-size: 1em;
    color: var(--text-color);
    margin-bottom: 6px;
}
.about-how-card p {
    margin: 0;
    font-size: inherit;
}
[data-theme="dark"] .about-how-card,
.theme-print .about-how-card {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.12);
}

.about-content ul {
    margin: 12px 0 20px;
    padding-left: 1.4em;
}

.about-content li {
    margin: 8px 0;
    font-size: 1.05em;
}

.about-belts-list,
.about-data-list {
    list-style: disc;
}

/* FAQ accordion – same card look as "Why we built this" */
.about-faq {
    display: grid;
    gap: 14px;
    margin: 16px 0 24px;
    padding: 0;
}
.about-faq-item {
    padding: 0;
    border-radius: 10px;
    background: rgba(234, 88, 12, 0.08);
    border: 1px solid rgba(234, 88, 12, 0.2);
    font-size: 0.95em;
    overflow: hidden;
}
[data-theme="dark"] .about-faq-item,
.theme-print .about-faq-item {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.12);
}
.about-faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 14px 18px;
    text-align: left;
    font-family: inherit;
    font-weight: 700;
    font-size: 1em;
    color: var(--text-color);
    background: transparent;
    border: none;
    cursor: pointer;
    gap: 12px;
    line-height: 1.4;
}
.about-faq-question:hover {
    background: rgba(234, 88, 12, 0.06);
}
[data-theme="dark"] .about-faq-question:hover {
    background: rgba(255, 255, 255, 0.04);
}
.about-faq-question-text {
    flex: 1;
}
.about-faq-icon {
    flex-shrink: 0;
    font-size: 1.2em;
    line-height: 1;
    transition: transform 0.2s ease;
}
.about-faq-item.about-faq-item--open .about-faq-icon {
    transform: rotate(45deg);
}
.about-faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
}
.about-faq-item.about-faq-item--open .about-faq-answer {
    max-height: 300px;
}
.about-faq-answer p {
    margin: 0;
    padding: 0 18px 14px;
    padding-left: 18px;
    padding-right: 18px;
    font-weight: normal;
    font-size: inherit;
    line-height: 1.55;
}
.about-content .about-legal {
    margin-top: 28px;
    font-size: 0.95em;
    opacity: 0.85;
}

/* Floating Feedback + Share container (high z-index so visible on Chrome) */
.feedback-floating-actions {
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 1500;
    pointer-events: none;
}
.feedback-floating-actions > * {
    pointer-events: auto;
}

.feedback-floating-btn {
    background: var(--primary-gradient);
    color: white;
    border: 2px solid var(--primary-color);
    padding: 12px 24px;
    border-radius: 25px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(234, 88, 12, 0.4);
    transition: all 0.3s ease;
    font-family: var(--body-font);
    animation: feedbackPulse 2s infinite;
}

.feedback-floating-share-btn {
    animation: none;
}

.feedback-floating-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(234, 88, 12, 0.6);
    background: linear-gradient(to right, var(--primary-red), var(--primary-red));
}

@keyframes feedbackPulse {
    0%, 100% {
        box-shadow: 0 4px 15px rgba(234, 88, 12, 0.4);
    }
    50% {
        box-shadow: 0 4px 20px rgba(234, 88, 12, 0.6);
    }
}

/* Mobile expectations notice – ninja themed, once per session */
.mobile-expectations-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 15000;
    padding: 20px;
}
.mobile-expectations-content {
    background: linear-gradient(180deg, #2a1a1a 0%, #1a1a1a 100%);
    border: 3px solid var(--primary-color, #ea580c);
    border-radius: 20px;
    padding: 28px 24px 24px;
    max-width: 340px;
    width: 100%;
    text-align: center;
    box-shadow: 0 0 0 1px rgba(234, 88, 12, 0.3), 0 12px 40px rgba(0, 0, 0, 0.5);
}
.mobile-expectations-ninja {
    display: block;
    font-size: 3rem;
    margin-bottom: 8px;
    line-height: 1;
}
.mobile-expectations-title {
    font-family: var(--heading-font), 'Genos', sans-serif;
    font-size: 1.5em;
    font-weight: 700;
    color: var(--primary-color, #ea580c);
    margin: 0 0 14px 0;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}
.mobile-expectations-message {
    color: var(--text-color, #e8e8e8);
    font-size: 0.95rem;
    line-height: 1.5;
    margin: 0 0 12px 0;
}
.mobile-expectations-cta {
    color: var(--muted-text, #a0a0a0);
    font-size: 0.9rem;
    margin: 0 0 20px 0;
}
.mobile-expectations-btn {
    display: inline-block;
    padding: 14px 28px;
    font-size: 1.1rem;
    font-weight: 700;
    font-family: var(--body-font);
    background: var(--primary-gradient, linear-gradient(to right, #ea580c, #dc2626));
    color: white;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    box-shadow: 0 4px 14px rgba(234, 88, 12, 0.4);
    transition: transform 0.2s, box-shadow 0.2s;
}
.mobile-expectations-btn:hover,
.mobile-expectations-btn:focus {
    transform: scale(1.03);
    box-shadow: 0 6px 20px rgba(234, 88, 12, 0.5);
}

/* Levels login required modal */
.levels-login-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: 20px;
}

.levels-login-modal-content {
    background: var(--container-bg);
    border: 2px solid var(--container-border);
    border-radius: 12px;
    padding: 28px 32px;
    max-width: 400px;
    width: 100%;
    position: relative;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
}

.levels-login-modal-content h3 {
    margin: 0 0 12px 0;
    font-size: 1.4em;
    color: var(--text-color);
}

.levels-login-modal-message {
    color: var(--text-color);
    opacity: 0.9;
    margin: 0 0 24px 0;
    font-size: 0.95em;
    line-height: 1.5;
}

.levels-login-modal-actions {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.levels-login-btn-primary {
    width: 100%;
    padding: 14px 20px;
    font-size: 1.1em;
    font-weight: bold;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.levels-login-btn-primary:hover {
    transform: scale(1.02);
    box-shadow: 0 5px 18px rgba(234, 88, 12, 0.45);
}

.levels-login-modal-secondary {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.levels-login-btn-small {
    padding: 8px 16px;
    font-size: 0.9em;
    background: transparent;
    color: var(--text-color);
    border: 1px solid var(--container-border);
    border-radius: 6px;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
}

.levels-login-btn-small:hover {
    border-color: var(--primary-color);
    background: rgba(234, 88, 12, 0.15);
}

.levels-login-modal-close {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 32px;
    height: 32px;
    border: none;
    background: rgba(234, 88, 12, 0.2);
    color: var(--text-color);
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.1em;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.levels-login-modal-close:hover {
    background: rgba(234, 88, 12, 0.4);
}

/* Feedback Modal – always dark mode (Ninja) regardless of page theme */
.feedback-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease-in;
}

.feedback-modal-content {
    background: #282828;
    border-radius: 12px;
    padding: 30px;
    max-width: 500px;
    width: 90%;
    position: relative;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    animation: slideUp 0.3s ease-out;
    color: #E8E8E8;
}

.feedback-modal-content h3 {
    margin-top: 0;
    color: #E8E8E8;
    font-size: 1.5em;
}

/* Paragraph text: darker gray for readability (not faint light gray) */
.feedback-modal-content .feedback-modal-p {
    color: #C8C8C8;
}
.feedback-modal-content .feedback-modal-p-muted {
    color: #A8A8A8;
}

.feedback-modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    background: rgba(234, 88, 12, 0.2);
    border: 1px solid rgba(234, 88, 12, 0.4);
    color: #E8E8E8;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2em;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.feedback-modal-close:hover {
    background: rgba(234, 88, 12, 0.3);
    transform: scale(1.1);
}

.feedback-modal-content .form-group {
    margin-bottom: 20px;
    margin-right: 0;
}

.feedback-modal-content .form-group label {
    display: block;
    margin-bottom: 8px;
    color: #E8E8E8;
    font-weight: 500;
}

.feedback-modal-content textarea {
    width: calc(100% - 2px);
    max-width: 100%;
    padding: 12px;
    border: 2px solid #404040;
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    resize: vertical;
    min-height: 120px;
    box-sizing: border-box;
    margin: 0;
    display: block;
    background: #1A1A1A;
    color: #E8E8E8;
}

.feedback-modal-content form {
    margin: 0;
    padding: 0;
}

.feedback-modal-content textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.feedback-modal-content input[type="email"],
.feedback-modal-content input[type="text"] {
    background: #1A1A1A;
    color: #E8E8E8;
    border: 2px solid #404040;
    border-radius: 6px;
    padding: 12px;
}
.feedback-modal-content input:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Keep Feedback + Share in dark (Ninja) mode when page uses Print theme */
body.theme-print .feedback-floating-btn {
    background: linear-gradient(to right, #EA580C, #DC2626);
    border-color: #EA580C;
    color: white;
}
body.theme-print .feedback-floating-btn:hover {
    background: linear-gradient(to right, #DC2626, #DC2626);
    box-shadow: 0 6px 20px rgba(234, 88, 12, 0.6);
}
body.theme-print .feedback-modal-content {
    background: #282828;
    color: #E8E8E8;
}
body.theme-print .feedback-modal-content h3,
body.theme-print .feedback-modal-content .form-group label,
body.theme-print .feedback-modal-close {
    color: #E8E8E8;
}
body.theme-print .feedback-modal-content .feedback-modal-p {
    color: #C8C8C8;
}
body.theme-print .feedback-modal-content .feedback-modal-p-muted {
    color: #A8A8A8;
}
body.theme-print .feedback-modal-content textarea,
body.theme-print .feedback-modal-content input[type="email"],
body.theme-print .feedback-modal-content input[type="text"] {
    background: #1A1A1A;
    color: #E8E8E8;
    border-color: #404040;
}
body.theme-print .feedback-modal-content .feedback-btn-primary {
    background: linear-gradient(to right, #EA580C, #DC2626);
    border-color: #EA580C;
}
body.theme-print .feedback-modal-content .feedback-btn-primary:hover:not(:disabled) {
    background: linear-gradient(to right, #DC2626, #DC2626);
}

.feedback-btn-primary {
    background: var(--primary-gradient);
    color: white;
    border: 2px solid var(--primary-color);
    padding: 10px 20px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.feedback-btn-primary:hover:not(:disabled) {
    background: linear-gradient(to right, var(--primary-red), var(--primary-red));
    transform: translateY(-1px);
}

.feedback-btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.feedback-btn-secondary {
    background: #6c757d;
    color: white;
    border: 2px solid #6c757d;
    padding: 10px 20px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.feedback-btn-secondary:hover {
    background: #5a6268;
    border-color: #5a6268;
}

/* Share with friend modal – social buttons */
.share-with-friend-social .feedback-share-btn {
    transition: transform 0.2s ease, opacity 0.2s ease;
}
.share-with-friend-social .feedback-share-btn:hover,
.share-with-friend-social a.feedback-share-btn:hover {
    transform: scale(1.05);
    opacity: 0.95;
}
.share-with-friend-social .feedback-share-btn:focus,
.share-with-friend-social a.feedback-share-btn:focus {
    outline: 2px solid var(--primary-color, #ea580c);
    outline-offset: 2px;
}

/* ========== Mobile problem view: single problem + custom keypad (max-width: 768px) ========== */
@media (max-width: 768px) {
    #problemsSection.problems-section-mobile-active #problemsGridWrapper,
    #problemsSection.problems-section-mobile-active #problemsGrid,
    #problemsSection.problems-section-mobile-active #timer,
    #problemsSection.problems-section-mobile-active .customize-btn,
    #problemsSection.problems-section-mobile-active .start-timer-btn,
    #problemsSection.problems-section-mobile-active .retake-btn,
    #problemsSection.problems-section-mobile-active .print-btn,
    #problemsSection.problems-section-mobile-active > div:first-child {
        display: none !important;
    }
    #problemsSection.problems-section-mobile-active #mobileProblemView {
        display: flex !important;
        flex-direction: column;
        position: fixed;
        inset: 0;
        z-index: 50;
        background: var(--page-bg, #1a1a1a);
        padding-top: env(safe-area-inset-top);
        padding-bottom: env(safe-area-inset-bottom);
    }
    /* In Safari tab: extra bottom pad so keyboard stays above browser bar */
    #problemsSection.problems-section-mobile-active.in-browser #mobileProblemView {
        padding-bottom: calc(88px + env(safe-area-inset-bottom, 0px));
    }
}

.mobile-problem-view .mobile-pause-overlay,
.mobile-problem-view .mobile-exit-overlay {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 100;
    background: rgba(0,0,0,0.75);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 24px;
    padding: 20px;
}
.mobile-problem-view .mobile-pause-overlay.is-visible,
.mobile-problem-view .mobile-exit-overlay.is-visible {
    display: flex;
}
.mobile-problem-view .mobile-exit-overlay { z-index: 101; gap: 20px; }
.mobile-problem-view .mobile-exit-overlay p { margin: 0; font-size: 16px; text-align: center; color: #fff; }
.mobile-problem-view .mobile-exit-btn-row { display: flex; gap: 12px; }
.mobile-problem-view .mobile-exit-overlay button {
    padding: 12px 24px;
    font-size: 16px;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    border: none;
}
.mobile-problem-view .mobile-cancel-btn { background: #555; color: #fff; }
.mobile-problem-view .mobile-exit-confirm-btn { background: #c00; color: #fff; }
.mobile-problem-view .mobile-resume-btn {
    padding: 14px 32px;
    font-size: 18px;
    font-weight: 600;
    border-radius: 12px;
    border: none;
    background: var(--primary-color, #ea580c);
    color: #fff;
    cursor: pointer;
}

.mobile-problem-view .mobile-problem-area {
    flex: 0 0 60%;
    display: flex;
    flex-direction: column;
    padding: max(6px, env(safe-area-inset-top)) 16px 12px 16px;
}
.mobile-problem-view .mobile-nav-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 0;
    margin-bottom: 12px;
}
.mobile-problem-view .mobile-nav-btn {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    border: 2px solid rgba(234, 88, 12, 0.6);
    background: rgba(234, 88, 12, 0.15);
    color: #fff;
    font-size: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}
.mobile-problem-view .mobile-nav-btn:active { background: rgba(234, 88, 12, 0.35); }
.mobile-problem-view .mobile-top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 0;
    margin-bottom: 16px;
}
.mobile-problem-view .mobile-top-bar-btn {
    padding: 10px 16px;
    border-radius: 10px;
    border: 2px solid rgba(255,255,255,0.25);
    background: rgba(255,255,255,0.08);
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}
.mobile-problem-view .mobile-top-bar-btn:active { background: rgba(255,255,255,0.2); }
.mobile-problem-view .mobile-exit-btn { border-color: rgba(255,120,120,0.5); color: #f88; }
.mobile-problem-view .mobile-counter {
    font-size: 18px;
    font-weight: 600;
    color: rgba(255,255,255,0.9);
}
.mobile-problem-view .mobile-problem-display {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 20px;
}
.mobile-problem-view .mobile-problem-equation {
    font-size: clamp(2rem, 8vw, 3.5rem);
    font-weight: 700;
    letter-spacing: 0.02em;
    margin-bottom: 24px;
    text-align: center;
    color: #fff;
}
.mobile-problem-view .mobile-problem-equation .mobile-op { color: var(--primary-color, #ea580c); }
.mobile-problem-view .mobile-answer-display {
    min-height: 56px;
    padding: 12px 20px;
    font-size: 28px;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: #E0E0E0;
    background: rgba(40, 40, 40, 0.8);
    border: 2px solid var(--primary-color, #ea580c);
    border-radius: 8px;
    min-width: 120px;
    text-align: center;
}
.mobile-problem-view .mobile-answer-display.empty { color: rgba(224,224,224,0.4); }
.mobile-problem-view .mobile-answer-display.empty::after { content: '?'; }

.mobile-problem-view .mobile-keyboard-wrap {
    flex: 0 0 40%;
    padding: 12px 12px max(12px, env(safe-area-inset-bottom));
    background: rgba(0,0,0,0.35);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}
.mobile-problem-view .mobile-keyboard {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 0.55fr;
    grid-template-rows: 1fr 1fr 1fr 1fr;
    gap: 10px;
    max-width: 320px;
    margin: 0 auto;
    width: 100%;
    aspect-ratio: 4/4;
    max-height: 100%;
}
.mobile-problem-view .mobile-keyboard-spacer {
    min-height: 72px;
}
.mobile-problem-view .mobile-key {
    border-radius: 12px;
    border: 2px solid rgba(255,255,255,0.2);
    background: rgba(60, 60, 60, 0.95);
    color: #fff;
    font-size: 22px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    transition: background 0.1s;
}
.mobile-problem-view .mobile-key:active { background: rgba(234, 88, 12, 0.4); }
.mobile-problem-view .mobile-key--digit { font-size: 26px; }
.mobile-problem-view .mobile-key--small { font-size: 16px; font-weight: 500; }
.mobile-problem-view .mobile-key--zero { grid-column: 1; grid-row: 4; }
.mobile-problem-view .mobile-key--minus { grid-column: 4; grid-row: 1; }
.mobile-problem-view .mobile-key--slash { grid-column: 4; grid-row: 2; }
.mobile-problem-view .mobile-key--del {
    grid-column: 2;
    grid-row: 4;
    background: rgba(80, 80, 80, 0.95);
    font-size: 16px;
}
.mobile-problem-view .mobile-key--enter {
    grid-column: 3 / 5;
    grid-row: 4;
    background: linear-gradient(180deg, var(--primary-color, #ea580c), #c2410c);
    border-color: var(--primary-color, #ea580c);
    font-size: 18px;
}