/* ================================================================
   QUESTION BATTLEFIELD — Dark Gaming Theme
   Kahoot-inspired real-time multiplayer quiz
   ================================================================ */

/* ---------- CSS Variables ---------- */
:root {
    --bg-primary: #0f0f1a;
    --bg-secondary: #1a1a2e;
    --bg-card: #16213e;
    --bg-card-hover: #1c2a4a;
    --bg-surface: rgba(255,255,255,0.04);
    --bg-surface-hover: rgba(255,255,255,0.08);

    --text-primary: #e8e8f0;
    --text-secondary: #8888a8;
    --text-muted: #555570;

    --accent-primary: #7c5cfc;
    --accent-primary-glow: rgba(124,92,252,0.4);
    --accent-secondary: #00d4ff;
    --accent-secondary-glow: rgba(0,212,255,0.3);

    /* Kahoot answer block colors */
    --answer-red: #e21b3c;
    --answer-blue: #1368ce;
    --answer-amber: #d89e00;
    --answer-green: #26890c;

    --correct-green: #00e676;
    --correct-glow: rgba(0,230,118,0.3);
    --wrong-red: #ff1744;
    --wrong-glow: rgba(255,23,68,0.3);

    --streak-orange: #ff9100;
    --streak-glow: rgba(255,145,0,0.4);
    --xp-gold: #ffd740;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 30px var(--accent-primary-glow);

    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Space Grotesk', 'Inter', sans-serif;

    --header-height: 56px;
    --transition-fast: 150ms ease;
    --transition-med: 300ms ease;
    --transition-slow: 500ms cubic-bezier(0.4,0,0.2,1);
}

/* ---------- Subject Visual Themes ---------- */
/* Override accent colors and bg particles per subject */
.theme-maths {
    --accent-primary: #667eea;
    --accent-primary-glow: rgba(102,126,234,0.4);
    --accent-secondary: #764ba2;
}
.theme-maths .bg-particles {
    background:
        radial-gradient(ellipse 600px 400px at 20% 30%, rgba(102,126,234,0.08), transparent),
        radial-gradient(ellipse 500px 500px at 80% 70%, rgba(118,75,162,0.06), transparent);
}

.theme-english {
    --accent-primary: #f5576c;
    --accent-primary-glow: rgba(245,87,108,0.4);
    --accent-secondary: #f093fb;
}
.theme-english .bg-particles {
    background:
        radial-gradient(ellipse 600px 400px at 20% 30%, rgba(245,87,108,0.07), transparent),
        radial-gradient(ellipse 500px 500px at 80% 70%, rgba(240,147,251,0.06), transparent);
}

.theme-science {
    --accent-primary: #4facfe;
    --accent-primary-glow: rgba(79,172,254,0.4);
    --accent-secondary: #00f2fe;
}
.theme-science .bg-particles {
    background:
        radial-gradient(ellipse 600px 400px at 20% 30%, rgba(79,172,254,0.08), transparent),
        radial-gradient(ellipse 500px 500px at 80% 70%, rgba(0,242,254,0.06), transparent);
}

.theme-physics {
    --accent-primary: #a18cd1;
    --accent-primary-glow: rgba(161,140,209,0.4);
    --accent-secondary: #fbc2eb;
}

.theme-chemistry {
    --accent-primary: #fcb69f;
    --accent-primary-glow: rgba(252,182,159,0.4);
    --accent-secondary: #ffecd2;
}

.theme-biology {
    --accent-primary: #a8edea;
    --accent-primary-glow: rgba(168,237,234,0.35);
    --accent-secondary: #fed6e3;
}

.theme-economics {
    --accent-primary: #d299c2;
    --accent-primary-glow: rgba(210,153,194,0.4);
    --accent-secondary: #fef9d7;
}

.theme-accounting {
    --accent-primary: #66a6ff;
    --accent-primary-glow: rgba(102,166,255,0.4);
    --accent-secondary: #89f7fe;
}

.theme-methods {
    --accent-primary: #a1c4fd;
    --accent-primary-glow: rgba(161,196,253,0.4);
    --accent-secondary: #c2e9fb;
}

.theme-specialist {
    --accent-primary: #fbc2eb;
    --accent-primary-glow: rgba(251,194,235,0.4);
    --accent-secondary: #a6c1ee;
}

/* Theme transition */
.battle-body {
    transition: --accent-primary 0.5s ease, --accent-secondary 0.5s ease;
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    overflow-x: hidden;
}

.battle-body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ---------- Background Particles ---------- */
.bg-particles {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background:
        radial-gradient(ellipse 600px 400px at 20% 30%, rgba(124,92,252,0.06), transparent),
        radial-gradient(ellipse 500px 500px at 80% 70%, rgba(0,212,255,0.05), transparent),
        radial-gradient(ellipse 400px 300px at 50% 50%, rgba(255,145,0,0.03), transparent);
}

/* ---------- Header ---------- */
.battle-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    background: rgba(15,15,26,0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255,255,255,0.06);
    z-index: 100;
}

.battle-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-primary);
}

.logo-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
}

.logo-text {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.95rem;
    opacity: 0.7;
}

.battle-header-center {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.battle-brand {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1rem;
    color: var(--accent-secondary);
    letter-spacing: -0.02em;
}

.battle-brand i {
    color: var(--xp-gold);
    margin-right: 4px;
}

.battle-header-right {
    display: flex;
    align-items: center;
}

.player-badge {
    display: flex;
    align-items: center;
    gap: 8px;
}

.player-avatar-small {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
    color: #fff;
}

.player-name-small {
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.btn-login {
    padding: 6px 16px;
    border-radius: var(--radius-sm);
    background: var(--accent-primary);
    color: #fff;
    font-weight: 600;
    font-size: 0.85rem;
    text-decoration: none;
    transition: background var(--transition-fast);
}

.btn-login:hover {
    background: #6a4ae0;
}

/* ---------- Main Content ---------- */
.battle-main {
    position: relative;
    z-index: 1;
    padding-top: var(--header-height);
    min-height: 100vh;
}

/* ---------- Screens (SPA sections) ---------- */
.screen {
    display: none;
    min-height: calc(100vh - var(--header-height));
    animation: screenFadeIn 0.4s ease;
}

.screen.active {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

@keyframes screenFadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ================================================================
   LOBBY SCREEN
   ================================================================ */
.lobby-container {
    width: 100%;
    max-width: 720px;
    padding: 40px 20px 100px;
    margin: 0 auto;
}

/* Hero */
.lobby-hero {
    text-align: center;
    margin-bottom: 48px;
}

.hero-icon-ring {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    padding: 3px;
    animation: heroRingSpin 6s linear infinite;
}

@keyframes heroRingSpin {
    0% { box-shadow: 0 0 20px var(--accent-primary-glow), 0 0 40px transparent; }
    50% { box-shadow: 0 0 20px var(--accent-secondary-glow), 0 0 40px var(--accent-primary-glow); }
    100% { box-shadow: 0 0 20px var(--accent-primary-glow), 0 0 40px transparent; }
}

.hero-icon {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--xp-gold);
}

.hero-title {
    font-family: var(--font-display);
    font-size: 2.4rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.hero-subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 400;
}

.beta-banner {
    display: inline-block;
    margin-top: 12px;
    padding: 6px 18px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    color: #ffd740;
    background: rgba(255,215,64,0.08);
    border: 1px solid rgba(255,215,64,0.25);
    border-radius: 20px;
}

/* Step Labels */
.lobby-step {
    margin-bottom: 32px;
}

.step-label {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.step-number {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--accent-primary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 700;
    color: #fff;
    flex-shrink: 0;
}

/* Subject Cards Grid */
.subject-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
}

.subject-card {
    position: relative;
    border: none;
    border-radius: var(--radius-md);
    padding: 28px 16px 20px;
    cursor: pointer;
    background: linear-gradient(135deg, var(--card-g1), var(--card-g2));
    color: #fff;
    text-align: center;
    overflow: hidden;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
}

.subject-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.15);
    border-radius: inherit;
    transition: background var(--transition-fast);
    pointer-events: none;
}

.subject-card:hover::before {
    background: rgba(0,0,0,0.05);
}

.subject-card:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 8px 30px rgba(0,0,0,0.4);
}

.subject-card:active {
    transform: translateY(-1px) scale(0.98);
}

.subject-card.selected {
    outline: 3px solid #fff;
    outline-offset: -3px;
    transform: translateY(-2px);
    box-shadow: 0 0 25px rgba(255,255,255,0.2);
}

.card-icon {
    position: relative;
    z-index: 1;
    font-size: 1.8rem;
    margin-bottom: 10px;
}

.card-label {
    position: relative;
    z-index: 1;
    font-weight: 700;
    font-size: 0.95rem;
    letter-spacing: -0.01em;
}

.card-glow {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.15) 0%, transparent 60%);
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
}

.subject-card:hover .card-glow {
    opacity: 1;
}

/* VCE Toggle */
.vce-toggle {
    text-align: center;
    margin: 20px 0 8px;
}

.btn-ghost {
    background: none;
    border: 1px solid rgba(255,255,255,0.12);
    color: var(--text-secondary);
    padding: 8px 20px;
    border-radius: var(--radius-xl);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-ghost:hover {
    border-color: var(--accent-primary);
    color: var(--text-primary);
    background: rgba(124,92,252,0.08);
}

.toggle-arrow {
    font-size: 0.7rem;
    transition: transform var(--transition-med);
}

.vce-grid.visible .toggle-arrow,
.btn-ghost.open .toggle-arrow {
    transform: rotate(180deg);
}

.subject-card-sm {
    padding: 20px 12px 16px;
}

.subject-card-sm .card-icon {
    font-size: 1.4rem;
    margin-bottom: 8px;
}

.subject-card-sm .card-label {
    font-size: 0.82rem;
}

/* VCE Grid - 4 columns for more items */
.vce-grid {
    grid-template-columns: repeat(4, 1fr);
}

/* Year Band Grid */
.year-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 12px;
}

.year-btn {
    border: 2px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-md);
    padding: 18px 16px;
    background: var(--bg-surface);
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    text-align: center;
    transition: all var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
}

.year-btn:hover {
    border-color: var(--accent-primary);
    background: rgba(124,92,252,0.1);
    transform: translateY(-2px);
}

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

.year-btn.selected {
    border-color: var(--accent-primary);
    background: rgba(124,92,252,0.15);
    box-shadow: 0 0 20px var(--accent-primary-glow);
}

/* Back Button */
.btn-back {
    margin-top: 16px;
    font-size: 0.82rem;
}

/* Ready Card */
.ready-card {
    text-align: center;
    background: var(--bg-card);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    box-shadow: var(--shadow-lg);
    max-width: 440px;
    width: 100%;
    margin: 0 auto;
}

.ready-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    border-radius: 50%;
    background: rgba(124,92,252,0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    color: var(--accent-primary);
    animation: readyPulse 2s ease-in-out infinite;
}

@keyframes readyPulse {
    0%, 100% { box-shadow: 0 0 0 0 var(--accent-primary-glow); }
    50% { box-shadow: 0 0 0 12px transparent; }
}

.ready-title {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.ready-desc {
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 8px;
}

.ready-tag {
    display: inline-block;
    padding: 4px 14px;
    border-radius: var(--radius-xl);
    background: rgba(124,92,252,0.15);
    color: var(--accent-primary);
    font-weight: 600;
    font-size: 0.85rem;
}

.ready-info {
    color: var(--text-muted);
    font-size: 0.82rem;
    margin-bottom: 24px;
}

/* Primary Button */
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: none;
    border-radius: var(--radius-xl);
    padding: 14px 36px;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.05rem;
    color: #fff;
    background: linear-gradient(135deg, var(--accent-primary), #9b6dfc);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    -webkit-tap-highlight-color: transparent;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px var(--accent-primary-glow);
}

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

.btn-lg {
    padding: 16px 44px;
    font-size: 1.1rem;
}

/* Pulse animation for CTA */
.btn-pulse {
    animation: btnPulse 2.5s ease-in-out infinite;
}

@keyframes btnPulse {
    0%, 100% { box-shadow: 0 0 0 0 var(--accent-primary-glow); }
    50% { box-shadow: 0 0 0 10px transparent; }
}

/* Lobby Footer */
.lobby-footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: center;
    gap: 32px;
    padding: 16px;
    background: rgba(15,15,26,0.9);
    backdrop-filter: blur(8px);
    border-top: 1px solid rgba(255,255,255,0.06);
    z-index: 50;
}

.lobby-link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: color var(--transition-fast);
}

.lobby-link:hover {
    color: var(--accent-secondary);
}

/* ================================================================
   WAITING ROOM
   ================================================================ */
.screen-waiting {
    background: radial-gradient(ellipse at 50% 30%, rgba(124,92,252,0.08), transparent 70%);
}

.waiting-container {
    text-align: center;
    padding: 40px 20px;
    max-width: 520px;
    width: 100%;
}

.room-code-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 40px;
}

.room-code-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.room-code-value {
    font-family: var(--font-display);
    font-size: 2.4rem;
    font-weight: 800;
    letter-spacing: 0.2em;
    color: var(--accent-secondary);
    text-shadow: 0 0 20px var(--accent-secondary-glow);
}

/* Waiting Spinner */
.waiting-status {
    margin-bottom: 32px;
}

.waiting-spinner {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    position: relative;
}

.spinner-ring {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    border: 3px solid transparent;
}

.spinner-ring:nth-child(1) {
    border-top-color: var(--accent-primary);
    animation: spinnerRotate 1.2s linear infinite;
}

.spinner-ring:nth-child(2) {
    inset: 6px;
    border-right-color: var(--accent-secondary);
    animation: spinnerRotate 1.8s linear infinite reverse;
}

.spinner-ring:nth-child(3) {
    inset: 12px;
    border-bottom-color: var(--xp-gold);
    animation: spinnerRotate 2.4s linear infinite;
}

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

.waiting-text {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.waiting-count {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Players Grid */
.players-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
    margin-bottom: 32px;
    min-height: 80px;
}

.player-slot {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    animation: playerJoin 0.4s cubic-bezier(0.34,1.56,0.64,1);
}

@keyframes playerJoin {
    from { opacity: 0; transform: scale(0.5) translateY(10px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.player-avatar {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.2rem;
    color: #fff;
    border: 2px solid rgba(255,255,255,0.2);
}

.player-slot-name {
    font-size: 0.75rem;
    color: var(--text-secondary);
    max-width: 70px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Waiting Timer */
.waiting-timer-wrap {
    margin-top: 16px;
}

.waiting-timer-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 4px;
}

.waiting-timer {
    font-family: var(--font-display);
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--text-primary);
}

/* ================================================================
   COUNTDOWN
   ================================================================ */
.screen-countdown {
    background: var(--bg-primary);
}

.countdown-container {
    text-align: center;
}

.countdown-number {
    font-family: var(--font-display);
    font-size: 10rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: countdownPop 1s ease-in-out;
    line-height: 1;
}

@keyframes countdownPop {
    0% { transform: scale(2); opacity: 0; }
    50% { transform: scale(0.9); opacity: 1; }
    70% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.countdown-label {
    font-size: 1.2rem;
    color: var(--text-secondary);
    font-weight: 600;
    margin-top: 8px;
}

/* ================================================================
   QUESTION SCREEN
   ================================================================ */
.screen-question {
    justify-content: flex-start !important;
    padding: 0;
}

/* Progress Bar */
.question-progress {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    height: 4px;
    background: rgba(255,255,255,0.06);
    z-index: 90;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    transition: width 0.4s ease;
    border-radius: 0 2px 2px 0;
}

/* Top Info Bar */
.question-topbar {
    width: 100%;
    max-width: 680px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px 0;
}

.q-counter {
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.q-counter #q-current {
    color: var(--text-primary);
    font-size: 1.1rem;
}

.q-difficulty {
    padding: 3px 12px;
    border-radius: var(--radius-xl);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.q-difficulty[data-diff="1"],
.q-difficulty.diff-easy {
    background: rgba(0,230,118,0.12);
    color: var(--correct-green);
}

.q-difficulty[data-diff="2"],
.q-difficulty.diff-medium {
    background: rgba(255,145,0,0.12);
    color: var(--streak-orange);
}

.q-difficulty[data-diff="3"],
.q-difficulty.diff-hard {
    background: rgba(255,23,68,0.12);
    color: var(--wrong-red);
}

/* Streak */
.q-streak-wrap {
    display: flex;
    align-items: center;
    gap: 4px;
}

.streak-icon {
    font-size: 1rem;
}

.streak-icon::before {
    content: '';
}

.streak-icon.fire::before {
    content: '\1F525';
}

.streak-count {
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--streak-orange);
}

.streak-active .streak-count {
    animation: streakPulse 0.6s ease;
}

@keyframes streakPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.4); }
    100% { transform: scale(1); }
}

/* Timer Circle */
.timer-container {
    width: 90px;
    height: 90px;
    margin: 16px auto 12px;
    position: relative;
}

.timer-svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.timer-bg {
    fill: none;
    stroke: rgba(255,255,255,0.06);
    stroke-width: 6;
}

.timer-ring {
    fill: none;
    stroke: var(--accent-secondary);
    stroke-width: 6;
    stroke-linecap: round;
    transition: stroke-dashoffset 1s linear, stroke 0.3s ease;
}

.timer-ring.warning {
    stroke: var(--streak-orange);
}

.timer-ring.danger {
    stroke: var(--wrong-red);
    animation: timerFlash 0.5s ease infinite;
}

@keyframes timerFlash {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.timer-text {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--text-primary);
}

/* Question Text */
.question-text {
    width: 100%;
    max-width: 680px;
    margin: 0 auto;
    padding: 12px 24px 20px;
    text-align: center;
    font-size: 1.2rem;
    font-weight: 500;
    line-height: 1.6;
    color: var(--text-primary);
    min-height: 60px;
}

.question-text .katex {
    font-size: 1.3em;
}

/* Tables inside question text (e.g. statistics, frequency tables) */
.question-text table {
    margin: 12px auto;
    border-collapse: collapse;
    font-size: 0.85rem;
    text-align: center;
}

.question-text th,
.question-text td {
    padding: 6px 12px;
    border: 1px solid rgba(255,255,255,0.15);
}

.question-text th {
    background: rgba(255,255,255,0.06);
    font-weight: 700;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--text-secondary);
}

.question-text td {
    color: var(--text-primary);
}

/* SVG diagrams inside questions */
.question-text svg {
    display: block;
    margin: 12px auto;
    max-width: 100%;
    height: auto;
    background: #fafafa;
    border-radius: 8px;
}

/* Answer Area */
.answer-area {
    width: 100%;
    max-width: 680px;
    margin: 0 auto;
    padding: 0 20px 40px;
}

/* MCQ Answer Blocks — Kahoot style */
.mcq-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.mcq-choice {
    position: relative;
    border: none;
    border-radius: var(--radius-md);
    padding: 20px 18px;
    cursor: pointer;
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    text-align: left;
    display: flex;
    align-items: center;
    gap: 14px;
    min-height: 64px;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-fast);
    overflow: hidden;
    -webkit-tap-highlight-color: transparent;
}

.mcq-choice:nth-child(1) { background: var(--answer-red); }
.mcq-choice:nth-child(2) { background: var(--answer-blue); }
.mcq-choice:nth-child(3) { background: var(--answer-amber); }
.mcq-choice:nth-child(4) { background: var(--answer-green); }

/* 5th and 6th choices (rare) */
.mcq-choice:nth-child(5) { background: #9b59b6; }
.mcq-choice:nth-child(6) { background: #1abc9c; }

.mcq-choice:hover {
    transform: scale(1.02);
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.mcq-choice:active {
    transform: scale(0.97);
}

.choice-shape {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    opacity: 0.7;
}

.choice-text {
    flex: 1;
    line-height: 1.3;
    word-break: break-word;
}

.choice-text .katex {
    font-size: 1.1em;
}

/* Answer states after selection */
.mcq-choice.disabled {
    pointer-events: none;
    cursor: default;
}

.mcq-choice.selected {
    outline: 3px solid #fff;
    outline-offset: -3px;
    transform: scale(1.02);
}

.mcq-choice.correct {
    background: var(--correct-green) !important;
    animation: correctBounce 0.5s ease;
}

.mcq-choice.wrong {
    background: var(--wrong-red) !important;
    animation: wrongShake 0.4s ease;
    opacity: 0.7;
}

.mcq-choice.dimmed {
    opacity: 0.35;
    pointer-events: none;
}

@keyframes correctBounce {
    0% { transform: scale(1); }
    30% { transform: scale(1.06); }
    60% { transform: scale(0.98); }
    100% { transform: scale(1); }
}

@keyframes wrongShake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-8px); }
    40% { transform: translateX(8px); }
    60% { transform: translateX(-4px); }
    80% { transform: translateX(4px); }
}

/* Multi-select: checkboxes */
.mcq-choice .choice-check {
    width: 22px;
    height: 22px;
    border: 2px solid rgba(255,255,255,0.5);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.mcq-choice.checked .choice-check {
    background: #fff;
    border-color: #fff;
    color: #333;
}

.mcq-choice.checked .choice-check::after {
    content: '\2713';
    font-weight: 800;
    font-size: 0.85rem;
}

/* Multi-select submit button */
.multi-submit-wrap {
    text-align: center;
    margin-top: 16px;
}

/* Input Mode */
.input-wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.input-answer {
    width: 100%;
    max-width: 320px;
    padding: 16px 20px;
    border: 2px solid rgba(255,255,255,0.12);
    border-radius: var(--radius-md);
    background: var(--bg-surface);
    color: var(--text-primary);
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 600;
    text-align: center;
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input-answer:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 4px var(--accent-primary-glow);
}

.input-answer.correct {
    border-color: var(--correct-green);
    box-shadow: 0 0 0 4px var(--correct-glow);
}

.input-answer.wrong {
    border-color: var(--wrong-red);
    box-shadow: 0 0 0 4px var(--wrong-glow);
    animation: wrongShake 0.4s ease;
}

.btn-submit-answer {
    padding: 12px 36px;
}

/* Score Popup */
.score-popup {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 200;
    pointer-events: none;
}

.score-popup-text {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 900;
    color: var(--xp-gold);
    text-shadow: 0 0 30px rgba(255,215,64,0.5);
    animation: scorePopup 1.2s ease forwards;
}

.score-popup.wrong-popup .score-popup-text {
    color: var(--wrong-red);
    text-shadow: 0 0 20px var(--wrong-glow);
}

@keyframes scorePopup {
    0% { opacity: 0; transform: scale(0.5) translateY(20px); }
    25% { opacity: 1; transform: scale(1.2) translateY(-10px); }
    60% { opacity: 1; transform: scale(1) translateY(-30px); }
    100% { opacity: 0; transform: scale(0.8) translateY(-60px); }
}

/* ================================================================
   ANSWER REVEAL
   ================================================================ */
.screen-reveal {
    background: radial-gradient(ellipse at 50% 40%, rgba(0,212,255,0.06), transparent 60%);
}

.reveal-container {
    text-align: center;
    padding: 40px 20px;
    max-width: 560px;
    width: 100%;
}

.reveal-result {
    margin-bottom: 20px;
}

.reveal-result .result-icon {
    font-size: 4rem;
    margin-bottom: 8px;
    line-height: 1;
}

.reveal-result .result-text {
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 800;
}

.reveal-result.is-correct .result-icon::before {
    content: '\2705';
}

.reveal-result.is-correct .result-text {
    color: var(--correct-green);
}

.reveal-result.is-wrong .result-icon::before {
    content: '\274C';
}

.reveal-result.is-wrong .result-text {
    color: var(--wrong-red);
}

.reveal-result.is-timeout .result-icon::before {
    content: '\23F0';
}

.reveal-result.is-timeout .result-text {
    color: var(--text-muted);
}

.reveal-answer {
    background: var(--bg-card);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--radius-md);
    padding: 16px 24px;
    margin-bottom: 16px;
    font-size: 1.05rem;
    line-height: 1.5;
}

.reveal-answer .answer-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.reveal-answer .answer-value {
    font-weight: 700;
    color: var(--correct-green);
}

.reveal-solve {
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    padding: 16px 24px;
    margin-bottom: 24px;
    text-align: left;
    font-size: 0.92rem;
    line-height: 1.6;
    color: var(--text-secondary);
    max-height: 200px;
    overflow-y: auto;
}

.reveal-solve:empty {
    display: none;
}

/* Mini Scoreboard */
.reveal-scores {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.reveal-score-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    background: var(--bg-surface);
    font-size: 0.85rem;
}

.reveal-score-row.is-me {
    background: rgba(124,92,252,0.12);
    border: 1px solid rgba(124,92,252,0.2);
}

.reveal-rank {
    font-weight: 800;
    color: var(--text-muted);
    min-width: 20px;
}

.reveal-player-name {
    flex: 1;
    font-weight: 600;
    text-align: left;
}

.reveal-player-score {
    font-weight: 700;
    color: var(--xp-gold);
}

.reveal-player-delta {
    font-size: 0.78rem;
    font-weight: 600;
}

.reveal-player-delta.positive {
    color: var(--correct-green);
}

.reveal-player-delta.zero {
    color: var(--text-muted);
}

/* ================================================================
   PODIUM / FINAL RESULTS
   ================================================================ */
.screen-podium {
    background: radial-gradient(ellipse at 50% 20%, rgba(255,215,64,0.08), transparent 50%);
}

.podium-container {
    text-align: center;
    padding: 40px 20px 80px;
    max-width: 600px;
    width: 100%;
}

.podium-title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 32px;
    background: linear-gradient(135deg, var(--xp-gold), #ffab00);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Top 3 Podium */
.podium-top3 {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 12px;
    margin-bottom: 32px;
    min-height: 220px;
}

.podium-place {
    display: flex;
    flex-direction: column;
    align-items: center;
    animation: podiumRise 0.8s cubic-bezier(0.34,1.56,0.64,1) backwards;
}

.podium-place:nth-child(1) { animation-delay: 0.4s; } /* 2nd place */
.podium-place:nth-child(2) { animation-delay: 0.6s; } /* 1st place */
.podium-place:nth-child(3) { animation-delay: 0.2s; } /* 3rd place */

@keyframes podiumRise {
    from { opacity: 0; transform: translateY(40px); }
    to { opacity: 1; transform: translateY(0); }
}

.podium-medal {
    font-size: 1.8rem;
    margin-bottom: 6px;
}

.podium-avatar {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.3rem;
    color: #fff;
    margin-bottom: 6px;
}

.podium-place.first .podium-avatar {
    width: 72px;
    height: 72px;
    font-size: 1.6rem;
    border: 3px solid var(--xp-gold);
    box-shadow: 0 0 20px rgba(255,215,64,0.3);
}

.podium-player-name {
    font-weight: 700;
    font-size: 0.85rem;
    margin-bottom: 4px;
    max-width: 90px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.podium-player-score {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1.1rem;
    color: var(--xp-gold);
}

.podium-base {
    width: 100px;
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    margin-top: 8px;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 8px;
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 900;
    color: rgba(255,255,255,0.3);
}

.podium-place.first .podium-base {
    height: 100px;
    background: linear-gradient(180deg, rgba(255,215,64,0.2), rgba(255,215,64,0.05));
}

.podium-place.second .podium-base {
    height: 70px;
    background: linear-gradient(180deg, rgba(192,192,192,0.15), rgba(192,192,192,0.03));
}

.podium-place.third .podium-base {
    height: 50px;
    background: linear-gradient(180deg, rgba(205,127,50,0.15), rgba(205,127,50,0.03));
}

/* Player Stats */
.podium-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--radius-md);
    padding: 16px 12px;
}

.stat-value {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.stat-label {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
}

/* Rankings List */
.podium-rankings {
    margin-bottom: 28px;
}

.ranking-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    margin-bottom: 4px;
    font-size: 0.88rem;
    transition: background var(--transition-fast);
}

.ranking-row:hover {
    background: var(--bg-surface-hover);
}

.ranking-row.is-me {
    background: rgba(124,92,252,0.1);
    border: 1px solid rgba(124,92,252,0.15);
}

.ranking-position {
    font-weight: 800;
    min-width: 24px;
    color: var(--text-muted);
}

.ranking-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.78rem;
    color: #fff;
    flex-shrink: 0;
}

.ranking-name {
    flex: 1;
    font-weight: 600;
    text-align: left;
}

.ranking-score {
    font-weight: 700;
    color: var(--xp-gold);
}

.ranking-accuracy {
    font-size: 0.78rem;
    color: var(--text-secondary);
    min-width: 40px;
    text-align: right;
}

/* Podium Actions */
.podium-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ================================================================
   CONFETTI CANVAS
   ================================================================ */
.confetti-canvas {
    position: fixed;
    inset: 0;
    z-index: 300;
    pointer-events: none;
}

/* ================================================================
   TOAST NOTIFICATIONS
   ================================================================ */
.toast-container {
    position: fixed;
    top: calc(var(--header-height) + 12px);
    right: 16px;
    z-index: 500;
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: none;
}

.toast {
    padding: 12px 20px;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 600;
    color: #fff;
    pointer-events: auto;
    animation: toastIn 0.3s ease;
    max-width: 320px;
}

.toast.toast-info {
    background: rgba(124,92,252,0.9);
    backdrop-filter: blur(8px);
}

.toast.toast-success {
    background: rgba(0,230,118,0.9);
    color: #0a2e0a;
}

.toast.toast-error {
    background: rgba(255,23,68,0.9);
}

.toast.toast-out {
    animation: toastOut 0.3s ease forwards;
}

@keyframes toastIn {
    from { opacity: 0; transform: translateX(40px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes toastOut {
    from { opacity: 1; transform: translateX(0); }
    to { opacity: 0; transform: translateX(40px); }
}

/* ================================================================
   UTILITY CLASSES
   ================================================================ */
.hidden { display: none !important; }

.text-center { text-align: center; }

/* ================================================================
   RESPONSIVE
   ================================================================ */
@media (max-width: 600px) {
    .hero-title { font-size: 1.8rem; }
    .hero-subtitle { font-size: 0.9rem; }

    .subject-grid { grid-template-columns: repeat(3, 1fr); gap: 10px; }
    .vce-grid { grid-template-columns: repeat(3, 1fr); }
    .subject-card { padding: 20px 10px 16px; }
    .card-icon { font-size: 1.5rem; }
    .card-label { font-size: 0.82rem; }

    .year-grid { grid-template-columns: 1fr 1fr; }

    .mcq-grid { grid-template-columns: 1fr; }
    .mcq-choice { min-height: 56px; padding: 16px 14px; }

    .question-text { font-size: 1.05rem; padding: 8px 16px 16px; }

    .podium-top3 { gap: 8px; }
    .podium-base { width: 80px; }
    .podium-stats { grid-template-columns: repeat(3, 1fr); gap: 8px; }

    .countdown-number { font-size: 7rem; }

    .battle-brand { display: none; }
    .logo-text { display: none; }
}

@media (max-width: 400px) {
    .subject-grid { grid-template-columns: repeat(2, 1fr); }
    .vce-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 768px) {
    .mcq-choice {
        padding: 22px 20px;
        font-size: 1.05rem;
    }

    .question-text {
        font-size: 1.3rem;
    }
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }

/* ---------- Selection ---------- */
::selection {
    background: var(--accent-primary);
    color: #fff;
}

/* ---------- SEO Content Section ---------- */
.seo-content {
    pointer-events: auto;
    position: relative !important;
    opacity: 1 !important;
    transform: none !important;
}

.seo-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 3rem 1.5rem 4rem;
}

.seo-intro { margin-bottom: 2.5rem; }

.seo-intro h2,
.seo-how h2,
.seo-faq h2 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.seo-intro p,
.seo-card p,
.seo-how p,
.faq-item p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 0.95rem;
}

.seo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.25rem;
    margin-bottom: 2.5rem;
}

.seo-card {
    background: var(--bg-card);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: 12px;
    padding: 1.25rem;
}

.seo-card h3 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-secondary);
    margin-bottom: 0.5rem;
}

.seo-how { margin-bottom: 2.5rem; }

.seo-how ol {
    list-style: none;
    counter-reset: steps;
    padding: 0;
}

.seo-how li {
    counter-increment: steps;
    position: relative;
    padding-left: 2.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.95rem;
}

.seo-how li::before {
    content: counter(steps);
    position: absolute;
    left: 0;
    width: 1.75rem;
    height: 1.75rem;
    background: var(--accent-primary);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 700;
}

.seo-how li strong { color: var(--text-primary); }

.seo-faq { margin-bottom: 1rem; }

.faq-item {
    border-bottom: 1px solid rgba(255,255,255,0.06);
    padding: 1rem 0;
}

.faq-item:last-child { border-bottom: none; }

.faq-item h3 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.4rem;
}

@media (max-width: 600px) {
    .seo-container { padding: 2rem 1rem 3rem; }
    .seo-grid { grid-template-columns: 1fr 1fr; gap: 0.75rem; }
    .seo-intro h2, .seo-how h2, .seo-faq h2 { font-size: 1.25rem; }
}

/* ================================================================
   LANDING PAGE
   ================================================================ */

.landing-page {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px 60px;
}

.landing-hero {
    text-align: center;
    padding: 50px 0 40px;
}

.landing-hero .hero-title {
    margin-top: 18px;
}

.landing-cta-btn {
    display: inline-flex;
    margin-top: 24px;
    font-size: 1.1rem;
    padding: 14px 36px;
}

.landing-stats {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin-top: 32px;
    padding: 18px 24px;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255,255,255,0.06);
}

.landing-stat {
    text-align: center;
}

.landing-stat-value {
    display: block;
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--accent-secondary);
}

.landing-stat-label {
    display: block;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-top: 2px;
}

.landing-stat-divider {
    width: 1px;
    height: 32px;
    background: rgba(255,255,255,0.08);
}

/* Landing sections */
.landing-section {
    margin-top: 48px;
}

.landing-section-title {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 8px;
}

.landing-section-desc {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 24px;
}

/* Subject tiles */
.landing-subject-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
}

.landing-subject-tile {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    border-radius: var(--radius-xl);
    background: linear-gradient(135deg, var(--card-g1), var(--card-g2));
    color: #fff;
    font-weight: 600;
    font-size: 0.85rem;
    text-decoration: none;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.landing-subject-tile:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.3);
}

.landing-subject-tile i { font-size: 0.9rem; }

/* How it works steps */
.landing-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-top: 20px;
}

.landing-step {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 20px 16px;
    text-align: center;
    border: 1px solid rgba(255,255,255,0.06);
}

.landing-step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--accent-primary);
    color: #fff;
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1rem;
    margin-bottom: 12px;
}

.landing-step h3 {
    font-family: var(--font-display);
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.landing-step p {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Mini leaderboard */
.landing-leaderboard {
    max-width: 500px;
    margin: 16px auto 0;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.landing-lb-row {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 10px 16px;
    border: 1px solid rgba(255,255,255,0.06);
}

.landing-lb-rank {
    width: 28px;
    height: 28px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.75rem;
    border-radius: 50%;
    flex-shrink: 0;
    background: var(--bg-surface);
    color: var(--text-secondary);
}

.landing-lb-name {
    flex: 1;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.landing-lb-score {
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--xp-gold);
}

.landing-lb-games {
    font-size: 0.75rem;
    color: var(--text-muted);
    min-width: 60px;
    text-align: right;
}

/* Teacher CTA */
.landing-teacher-cta {
    margin-top: 48px;
}

.landing-teacher-inner {
    text-align: center;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255,255,255,0.06);
    padding: 36px 28px;
}

.landing-teacher-icon {
    font-size: 2.2rem;
    color: var(--accent-secondary);
    margin-bottom: 12px;
}

.landing-teacher-inner h2 {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.landing-teacher-inner p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    max-width: 500px;
    margin: 0 auto 20px;
}

/* Bottom CTA */
.landing-bottom-cta {
    text-align: center;
    padding: 48px 0 24px;
}

.landing-bottom-cta h2 {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 20px;
}

/* Landing responsive */
@media (max-width: 768px) {
    .landing-steps { grid-template-columns: repeat(2, 1fr); }
    .landing-stats { flex-wrap: wrap; gap: 12px; }
    .landing-stat-divider { display: none; }
}

@media (max-width: 480px) {
    .landing-hero { padding: 30px 0 24px; }
    .landing-section-title { font-size: 1.2rem; }
    .landing-steps { grid-template-columns: 1fr; }
    .landing-stats { gap: 8px; }
    .landing-stat-value { font-size: 1.1rem; }
    .landing-cta-btn { font-size: 1rem; padding: 12px 28px; }
    .landing-lb-games { display: none; }
}

/* ================================================================
   LEADERBOARD & HISTORY PAGES
   ================================================================ */

.screen-page {
    justify-content: flex-start !important;
    padding-bottom: 60px;
}

.page-container {
    width: 100%;
    max-width: 800px;
    padding: 30px 20px;
    margin: 0 auto;
}

.page-header {
    text-align: center;
    margin-bottom: 32px;
}

.page-title {
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 800;
    margin: 12px 0 6px;
    background: linear-gradient(135deg, var(--xp-gold), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-title i {
    -webkit-text-fill-color: var(--xp-gold);
    margin-right: 8px;
}

.page-subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.btn-back-sm {
    font-size: 0.8rem;
    padding: 4px 12px;
}

/* Tab bar (This Week / All Time) */
.page-tab-bar {
    display: flex;
    justify-content: center;
    gap: 4px;
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    padding: 4px;
    margin-top: 16px;
}

.page-tab {
    padding: 8px 20px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.page-tab:hover { color: var(--text-primary); }

.page-tab.active {
    background: var(--accent-primary);
    color: #fff;
}

/* ---------- Filters ---------- */
.lb-filters {
    margin-bottom: 24px;
}

.filter-group {
    margin-bottom: 12px;
}

.filter-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 6px;
}

.filter-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.filter-pill {
    padding: 6px 14px;
    border-radius: var(--radius-xl);
    background: var(--bg-surface);
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 500;
    text-decoration: none;
    border: 1px solid transparent;
    transition: all var(--transition-fast);
}

.filter-pill:hover {
    background: var(--bg-surface-hover);
    color: var(--text-primary);
}

.filter-pill.active {
    background: var(--accent-primary);
    color: #fff;
    border-color: var(--accent-primary);
}

/* ---------- Leaderboard Table ---------- */
.lb-table-wrap {
    overflow-x: auto;
    border-radius: var(--radius-md);
    border: 1px solid rgba(255,255,255,0.06);
}

.lb-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.lb-table thead {
    background: var(--bg-card);
}

.lb-table th {
    padding: 12px 16px;
    text-align: left;
    font-weight: 600;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.lb-table td {
    padding: 12px 16px;
    border-top: 1px solid rgba(255,255,255,0.04);
    white-space: nowrap;
}

.lb-table tbody tr {
    transition: background var(--transition-fast);
}

.lb-table tbody tr:hover {
    background: var(--bg-surface);
}

.lb-row-me {
    background: rgba(124,92,252,0.08) !important;
    border-left: 3px solid var(--accent-primary);
}

.col-rank { width: 50px; text-align: center; }
.col-score, .col-games, .col-wins, .col-acc, .col-streak { text-align: right; }
.col-score { font-weight: 700; color: var(--xp-gold); }

/* Rank medals */
.rank-medal {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    font-weight: 800;
    font-size: 0.75rem;
}

.rank-1 { background: linear-gradient(135deg, #FFD700, #FFA000); color: #1a1a2e; }
.rank-2 { background: linear-gradient(135deg, #C0C0C0, #9E9E9E); color: #1a1a2e; }
.rank-3 { background: linear-gradient(135deg, #CD7F32, #8B5E3C); color: #fff; }

.rank-1 i { font-size: 0.8rem; }

/* Avatar in table */
.lb-avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.7rem;
    color: #fff;
    margin-right: 8px;
    vertical-align: middle;
    flex-shrink: 0;
}

.lb-you-badge {
    display: inline-block;
    padding: 1px 6px;
    border-radius: var(--radius-sm);
    background: var(--accent-primary);
    color: #fff;
    font-size: 0.6rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    margin-left: 6px;
    vertical-align: middle;
}

/* Empty state */
.lb-empty {
    text-align: center;
    padding: 60px 20px;
}

.lb-empty-icon {
    font-size: 3rem;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.lb-empty p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

/* ---------- History Stats Grid ---------- */
.history-stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 28px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 16px;
    text-align: center;
    border: 1px solid rgba(255,255,255,0.06);
}

.stat-value {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--accent-secondary);
}

.stat-label {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-top: 4px;
}

/* ---------- History Cards ---------- */
.history-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.history-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 14px 18px;
    border: 1px solid rgba(255,255,255,0.06);
    transition: background var(--transition-fast);
}

.history-card:hover { background: var(--bg-card-hover); }

.history-card-win {
    border-left: 3px solid var(--xp-gold);
}

.history-card-left {
    display: flex;
    align-items: center;
    gap: 14px;
}

.history-rank-badge {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.8rem;
    flex-shrink: 0;
}

.rank-pos-1 { background: linear-gradient(135deg, #FFD700, #FFA000); color: #1a1a2e; }
.rank-pos-2 { background: linear-gradient(135deg, #C0C0C0, #9E9E9E); color: #1a1a2e; }
.rank-pos-3 { background: linear-gradient(135deg, #CD7F32, #8B5E3C); color: #fff; }
.rank-pos-4 { background: var(--bg-surface); color: var(--text-secondary); }

.history-subject {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.history-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 2px;
}

.history-card-right {
    text-align: right;
}

.history-score {
    font-weight: 700;
    font-size: 1rem;
    color: var(--xp-gold);
}

.history-details {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 2px;
}

/* ---------- Badges / Achievements ---------- */
.history-badges { margin-bottom: 24px; }
.history-badges .section-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.badges-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.badge-card {
    background: var(--bg-card);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--radius-md);
    padding: 14px 18px;
    text-align: center;
    min-width: 110px;
    transition: border-color 0.2s;
}
.badge-card:hover {
    border-color: var(--xp-gold);
}
.badge-icon {
    font-size: 1.6rem;
    color: var(--xp-gold);
    margin-bottom: 6px;
}
.badge-title {
    font-weight: 700;
    font-size: 0.8rem;
    color: var(--text-primary);
}
.badge-date {
    font-size: 0.65rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* ---------- Responsive ---------- */
@media (max-width: 600px) {
    .page-title { font-size: 1.4rem; }
    .history-stats-grid { grid-template-columns: repeat(2, 1fr); }
    .history-card { flex-direction: column; align-items: flex-start; gap: 10px; }
    .history-card-right { text-align: left; }
    .lb-table { font-size: 0.8rem; }
    .lb-table th, .lb-table td { padding: 10px 10px; }
    .col-acc, .col-streak { display: none; }
}