/* ==========================================================
   1. COLOR THEMES & VARIABLES
   ========================================================== */
:root {
    /* Fonts — Fredoka (playful, bold display) + Nunito (warm, highly legible body).
       Shared with Algebra Quest so the arcade feels like one connected site. */
    --font-heading: 'Fredoka', sans-serif;
    --font-body: 'Nunito', sans-serif;

    /* Button/badge fills: chosen so their paired text color passes WCAG AA
       contrast regardless of theme (button backgrounds don't change with
       light/dark — only the page and card colors around them do). */
    --blue-btn-a: #0369a1;
    --blue-btn-b: #075985;
    --amber-btn-a: #f59e0b;
    --amber-btn-b: #d97706;
    --purple-btn-a: #6d28d9;
    --purple-btn-b: #4c1d95;
}

/* Dark Theme Variables (Default) */
[data-theme="dark"] {
    --bg-page: #0a0e1a;
    --bg-page-dot: rgba(148, 163, 184, 0.07);
    --bg-card: #131a2c;
    --bg-card-hover: #1c2540;
    --bg-logo-card: #0f172a;
    --border-card: #2b3554;
    --ink: #f5f7ff;
    --ink-soft: #aab3cc;
    --header-bg: rgba(16, 22, 38, 0.92);
    --toggle-bg: #1c2540;
    --toggle-text: #facc15;
    --card-shadow: 0 12px 28px -8px rgba(0, 0, 0, 0.6);
    --disclaimer-bg: rgba(250, 204, 21, 0.1);
    --disclaimer-border: #facc15;
    --disclaimer-title: #fde68a;
    --title-grad: linear-gradient(90deg, #38bdf8 0%, #facc15 50%, #c084fc 100%);

    --blue-ink: #7dd3fc;
    --blue-soft-bg: rgba(56, 189, 248, 0.16);
    --amber-ink: #fbbf24;
    --amber-soft-bg: rgba(251, 191, 36, 0.16);
    --purple-ink: #c4b5fd;
    --purple-soft-bg: rgba(196, 181, 253, 0.16);
    --amber-btn-text: #241900;
}

/* Light Theme Variables */
[data-theme="light"] {
    --bg-page: #eef2fb;
    --bg-page-dot: rgba(3, 105, 161, 0.06);
    --bg-card: #ffffff;
    --bg-card-hover: #f6f9ff;
    --bg-logo-card: #0f172a;
    --border-card: #c7d5f0;
    --ink: #101828;
    --ink-soft: #48536b;
    --header-bg: rgba(255, 255, 255, 0.92);
    --toggle-bg: #e3ecff;
    --toggle-text: #0353a4;
    --card-shadow: 0 12px 28px -10px rgba(16, 24, 40, 0.16);
    --disclaimer-bg: rgba(217, 119, 6, 0.09);
    --disclaimer-border: #d97706;
    --disclaimer-title: #92400e;
    --title-grad: linear-gradient(90deg, #0369a1 0%, #92400e 50%, #6d28d9 100%);

    --blue-ink: #075985;
    --blue-soft-bg: #dbeeff;
    --amber-ink: #92400e;
    --amber-soft-bg: #fef3d9;
    --purple-ink: #5b21b6;
    --purple-soft-bg: #ede9fe;
    --amber-btn-text: #241900;
}

/* ==========================================================
   2. GLOBAL STYLES
   ========================================================== */
html {
    font-size: 112.5%; /* ~18px base — bumped up for projector/classroom viewing */
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease, transform 0.2s ease;
}

@media (prefers-reduced-motion: reduce) {
    * { transition: none !important; animation: none !important; }
}

body {
    background-color: var(--bg-page);
    background-image: radial-gradient(var(--bg-page-dot) 1.5px, transparent 1.5px);
    background-size: 28px 28px;
    color: var(--ink);
    font-family: var(--font-body);
    font-size: clamp(1.05rem, 1rem + 0.3vw, 1.2rem);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    line-height: 1.65;
}

a { color: inherit; }

:focus-visible {
    outline: 3px solid var(--blue-ink);
    outline-offset: 3px;
    border-radius: 6px;
}

/* ==========================================================
   3. HEADER SECTION
   ========================================================== */
header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: var(--header-bg);
    backdrop-filter: blur(16px);
    border-bottom: 3px solid var(--border-card);
    padding: 20px 32px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}

.header-container {
    max-width: 1320px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    width: 100%;
}

.logo-group {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 22px;
    text-align: left;
}

.logo-img {
    height: clamp(84px, 6vw + 60px, 128px);
    width: auto;
    object-fit: contain;
    border-radius: 18px;
    background-color: var(--bg-logo-card);
    padding: 10px;
    border: 2px solid var(--border-card);
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.15);
}

.title-group .sub-header {
    font-size: clamp(1rem, 0.4vw + 0.9rem, 1.15rem);
    color: var(--ink-soft);
    font-weight: 800;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    margin-bottom: 6px;
}

.title-group h1 {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: clamp(1.9rem, 1.5vw + 1.5rem, 3.1rem);
    letter-spacing: 0.3px;
    background: var(--title-grad);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.15;
}

.theme-toggle-btn {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    background-color: var(--toggle-bg);
    color: var(--toggle-text);
    border: 2px solid var(--border-card);
    padding: 12px 22px;
    border-radius: 24px;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: clamp(0.95rem, 0.3vw + 0.85rem, 1.1rem);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.15);
    white-space: nowrap;
}

.theme-toggle-btn:hover {
    transform: translateY(-50%) scale(1.06);
}

/* ==========================================================
   4. MAIN CONTENT & HERO BANNER
   ========================================================== */
main {
    flex: 1;
    max-width: 1320px;
    width: 100%;
    margin: 0 auto;
    padding: 48px 28px;
}

.hero-banner {
    text-align: center;
    margin-bottom: 56px;
    padding: clamp(32px, 3vw, 48px) clamp(24px, 4vw, 44px);
    background: var(--bg-card);
    border: 2px solid var(--border-card);
    border-radius: 28px;
    box-shadow: var(--card-shadow);
}

.hero-banner h2 {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: clamp(1.7rem, 1.4vw + 1.3rem, 2.6rem);
    margin-bottom: 16px;
    letter-spacing: 0.3px;
}

.hero-banner p {
    font-size: clamp(1.08rem, 0.4vw + 1rem, 1.35rem);
    color: var(--ink-soft);
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.65;
}

.disclaimer-box {
    margin-top: 28px;
    padding: 22px 26px;
    background: var(--disclaimer-bg);
    border: 3px dashed var(--disclaimer-border);
    border-radius: 18px;
    text-align: left;
    font-size: clamp(1rem, 0.2vw + 0.95rem, 1.12rem);
    color: var(--ink);
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.05);
}

.disclaimer-title {
    font-family: var(--font-heading);
    font-weight: 600;
    color: var(--disclaimer-title);
    margin-bottom: 10px;
    font-size: clamp(1.1rem, 0.2vw + 1.05rem, 1.25rem);
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: 0.3px;
}

.disclaimer-box p + p {
    margin-top: 10px;
}

/* ==========================================================
   5. GRADE SECTIONS & TILES GRID
   ========================================================== */
.grade-section {
    margin-bottom: 56px;
}

.section-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 4px solid var(--border-card);
}

.section-header h3 {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: clamp(1.4rem, 0.8vw + 1.15rem, 1.9rem);
    letter-spacing: 0.3px;
}

.section-badge {
    font-family: var(--font-heading);
    font-weight: 600;
    padding: 6px 16px;
    border-radius: 24px;
    font-size: clamp(0.82rem, 0.2vw + 0.78rem, 0.92rem);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.track-math6 .section-header { border-color: var(--blue-btn-a); }
.track-math6 h3 { color: var(--blue-ink); }
.track-math6 .section-badge { background: linear-gradient(135deg, var(--blue-btn-a), var(--blue-btn-b)); color: #ffffff; }

.track-prealgebra .section-header { border-color: var(--amber-btn-a); }
.track-prealgebra h3 { color: var(--amber-ink); }
.track-prealgebra .section-badge { background: linear-gradient(135deg, var(--amber-btn-a), var(--amber-btn-b)); color: var(--amber-btn-text); }

.track-algebra1 .section-header { border-color: var(--purple-btn-a); }
.track-algebra1 h3 { color: var(--purple-ink); }
.track-algebra1 .section-badge { background: linear-gradient(135deg, var(--purple-btn-a), var(--purple-btn-b)); color: #ffffff; }

.games-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 28px;
}

.game-card {
    background-color: var(--bg-card);
    border: 2px solid var(--border-card);
    border-radius: 22px;
    padding: 28px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    box-shadow: var(--card-shadow);
    position: relative;
    overflow: hidden;
}

.game-card:hover {
    transform: translateY(-6px);
    background-color: var(--bg-card-hover);
}

.track-math6 .game-card:hover { border-color: var(--blue-btn-a); box-shadow: 0 14px 30px -8px rgba(3, 105, 161, 0.35); }
.track-prealgebra .game-card:hover { border-color: var(--amber-btn-a); box-shadow: 0 14px 30px -8px rgba(217, 119, 6, 0.32); }
.track-algebra1 .game-card:hover { border-color: var(--purple-btn-a); box-shadow: 0 14px 30px -8px rgba(109, 40, 217, 0.35); }

.game-card:hover .game-icon {
    transform: scale(1.15) rotate(-4deg);
}

.game-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 16px;
}

.game-icon {
    font-size: clamp(2.6rem, 1.2vw + 2.2rem, 3.2rem);
    line-height: 1;
    display: inline-block;
    transition: transform 0.25s ease;
}

.game-tag {
    font-family: var(--font-body);
    font-weight: 800;
    font-size: clamp(0.82rem, 0.2vw + 0.78rem, 0.92rem);
    padding: 6px 14px;
    border-radius: 10px;
    white-space: nowrap;
}

.track-math6 .game-tag { background: var(--blue-soft-bg); color: var(--blue-ink); }
.track-prealgebra .game-tag { background: var(--amber-soft-bg); color: var(--amber-ink); }
.track-algebra1 .game-tag { background: var(--purple-soft-bg); color: var(--purple-ink); }

.game-title {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: clamp(1.25rem, 0.5vw + 1.1rem, 1.5rem);
    margin-bottom: 10px;
    color: var(--ink);
    letter-spacing: 0.2px;
}

.game-description {
    font-size: clamp(1rem, 0.2vw + 0.95rem, 1.12rem);
    color: var(--ink-soft);
    margin-bottom: 26px;
    flex-grow: 1;
    line-height: 1.55;
}

.play-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 16px;
    border-radius: 14px;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: clamp(1.05rem, 0.2vw + 1rem, 1.2rem);
    text-decoration: none;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.18);
    gap: 8px;
    letter-spacing: 0.3px;
}

.track-math6 .play-btn { background: linear-gradient(135deg, var(--blue-btn-a), var(--blue-btn-b)); color: #ffffff; }
.track-prealgebra .play-btn { background: linear-gradient(135deg, var(--amber-btn-a), var(--amber-btn-b)); color: var(--amber-btn-text); }
.track-algebra1 .play-btn { background: linear-gradient(135deg, var(--purple-btn-a), var(--purple-btn-b)); color: #ffffff; }

.play-btn:hover {
    transform: scale(1.03);
    filter: brightness(1.15);
}

/* ==========================================================
   6. FOOTER
   ========================================================== */
footer {
    text-align: center;
    padding: 32px 20px;
    border-top: 2px solid var(--border-card);
    color: var(--ink-soft);
    font-size: clamp(0.95rem, 0.2vw + 0.9rem, 1.05rem);
    background: var(--bg-card);
    margin-top: auto;
    line-height: 1.65;
}

.footer-subtext {
    font-size: clamp(0.88rem, 0.2vw + 0.84rem, 0.98rem);
    margin-top: 8px;
    opacity: 0.95;
}

/* ==========================================================
   7. RESPONSIVE BREAKPOINTS
   ========================================================== */
@media (max-width: 680px) {
    .header-container {
        flex-direction: column;
        padding-top: 38px;
    }
    .theme-toggle-btn {
        top: 0;
        right: 0;
        transform: none;
        padding: 8px 14px;
        font-size: 0.8rem;
    }
    .logo-group {
        flex-direction: column;
        text-align: center;
        gap: 14px;
    }
    .games-grid { grid-template-columns: 1fr; }
}