/* =================================================================
   EDU TETRIS ARCADE - CYBER NEON STYLES
================================================================== */
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@500;700;900&family=Rajdhani:wght@500;600;700&display=swap');

:root {
    --neon-blue: #00f0ff;
    --neon-purple: #b026ff;
    --neon-green: #00ff88;
    --neon-pink: #ff007f;
    --neon-amber: #ffaa00;
    --bg-dark: #0a0c16;
    --card-bg: rgba(18, 24, 43, 0.75);
    --border-glow: rgba(0, 240, 255, 0.25);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
}

body {
    background: radial-gradient(circle at 50% 20%, #151b36 0%, #080a12 80%);
    color: #e2e8f0;
    font-family: 'Rajdhani', sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow-x: hidden;
    overflow-y: auto;
    padding: 10px;
}

/* Background animated glow grid */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-image: 
        linear-gradient(rgba(0, 240, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 240, 255, 0.03) 1px, transparent 1px);
    background-size: 32px 32px;
    pointer-events: none;
    z-index: 0;
}

#game-wrapper {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 980px;
    width: 100%;
}

/* Header bar */
.top-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    margin-bottom: 8px;
    padding: 0 4px;
}

.back-link {
    color: #94a3b8;
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.2s ease;
}

.back-link:hover {
    color: var(--neon-blue);
    border-color: var(--neon-blue);
    background: rgba(0, 240, 255, 0.1);
}

.arcade-title {
    font-family: 'Orbitron', monospace;
    font-size: 1.6rem;
    font-weight: 900;
    letter-spacing: 2px;
    background: linear-gradient(90deg, var(--neon-blue), var(--neon-green));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 0 20px rgba(0, 240, 255, 0.4);
    text-align: center;
}

/* Main Layout */
.game-container {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 16px;
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-glow);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5), 0 0 25px rgba(0, 240, 255, 0.15);
    padding: 14px;
    border-radius: 16px;
    max-width: 100%;
}

/* Canvas board wrapper */
.canvas-wrapper {
    position: relative;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.8), 0 0 15px rgba(0, 240, 255, 0.2);
    border: 2px solid rgba(0, 240, 255, 0.4);
    background: #000000;
}

canvas#tetris {
    display: block;
    background: #070913;
    max-height: 72vh;
    width: auto;
    height: auto;
    object-fit: contain;
}

/* Sidebars (Left & Right for widescreen, or single for mobile) */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 12px;
    width: 175px;
}

.sidebar-box {
    background: rgba(10, 14, 28, 0.85);
    padding: 12px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.5);
    text-align: center;
}

.sidebar-box h2, .sidebar-box h3 {
    font-family: 'Orbitron', monospace;
    font-size: 0.8rem;
    font-weight: 700;
    color: #94a3b8;
    letter-spacing: 1.5px;
    margin-bottom: 6px;
    text-transform: uppercase;
}

.sidebar-box .metric {
    font-family: 'Orbitron', monospace;
    font-size: 1.45rem;
    font-weight: 900;
    color: #ffffff;
    letter-spacing: 1px;
}

.sidebar-box .metric.score-metric {
    color: var(--neon-green);
    text-shadow: 0 0 12px rgba(0, 255, 136, 0.5);
}

.sidebar-box .metric.high-metric {
    color: var(--neon-amber);
    text-shadow: 0 0 12px rgba(255, 170, 0, 0.5);
    font-size: 1.15rem;
}

.sidebar-box .metric.level-metric {
    color: var(--neon-blue);
}

.sidebar-box .metric.lines-metric {
    color: var(--neon-pink);
}

#next-pieces {
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: center;
    margin-top: 4px;
}

#next-pieces canvas, canvas#hold-piece {
    background-color: #060810;
    border: 1px solid rgba(0, 240, 255, 0.2);
    border-radius: 8px;
}

/* Audio Controls */
.audio-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 4px;
    margin-bottom: 10px;
}

.audio-controls button, .music-controls button {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: #ffffff;
    font-family: 'Orbitron', monospace;
    font-size: 0.85rem;
    font-weight: bold;
    cursor: pointer;
    padding: 6px 10px;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.audio-controls button:hover, .music-controls button:hover {
    background: rgba(0, 240, 255, 0.2);
    border-color: var(--neon-blue);
    transform: translateY(-1px);
}

.music-controls {
    display: flex;
    justify-content: center;
    gap: 6px;
}

.music-controls button {
    flex: 1;
    font-size: 0.75rem;
}

.music-controls button.active {
    background: var(--neon-blue);
    color: #000;
    border-color: var(--neon-blue);
    box-shadow: 0 0 10px rgba(0, 240, 255, 0.6);
}

#vol-display {
    font-family: 'Orbitron', monospace;
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--neon-blue);
    min-width: 20px;
    text-align: center;
}

/* Floating Banner Notifications (T-Spin, Tetris, Combos) */
.toast-badge {
    position: absolute;
    top: 35%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.8);
    font-family: 'Orbitron', monospace;
    font-weight: 900;
    font-size: 1.5rem;
    padding: 8px 18px;
    border-radius: 8px;
    background: rgba(10, 14, 28, 0.95);
    border: 2px solid var(--neon-pink);
    color: #ffffff;
    box-shadow: 0 0 25px rgba(255, 0, 127, 0.7);
    pointer-events: none;
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 20;
    white-space: nowrap;
}

.toast-badge.show {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1.1);
}

/* Touch Controls for Mobile */
.mobile-controls {
    display: none;
    width: 100%;
    margin-top: 14px;
    gap: 12px;
    justify-content: space-between;
}

.touch-btn {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(0, 240, 255, 0.3);
    color: #ffffff;
    font-family: 'Orbitron', monospace;
    font-size: 1.1rem;
    font-weight: 700;
    padding: 12px 14px;
    border-radius: 12px;
    min-width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
    touch-action: manipulation;
}

.touch-btn:active {
    background: var(--neon-blue);
    color: #000;
    transform: scale(0.95);
    box-shadow: 0 0 15px rgba(0, 240, 255, 0.6);
}

.touch-btn.accent {
    border-color: var(--neon-green);
    color: var(--neon-green);
}

.touch-btn.accent:active {
    background: var(--neon-green);
    color: #000;
}

.touch-btn.action {
    border-color: var(--neon-pink);
    color: var(--neon-pink);
}

.touch-btn.action:active {
    background: var(--neon-pink);
    color: #000;
}

/* UI Overlays (Start, Pause, Game Over) */
.overlay {
    position: fixed;
    inset: 0;
    background: rgba(6, 9, 18, 0.88);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    padding: 16px;
    transition: opacity 0.2s ease;
}

.overlay.hidden {
    display: none;
}

.overlay-content {
    background: linear-gradient(145deg, #161c36, #0c1020);
    padding: 32px 36px;
    border-radius: 20px;
    border: 2px solid var(--neon-blue);
    text-align: center;
    box-shadow: 0 0 40px rgba(0, 240, 255, 0.35);
    max-width: 440px;
    width: 100%;
}

.overlay-content h2 {
    font-family: 'Orbitron', monospace;
    margin: 0 0 16px 0;
    font-size: 2.2rem;
    font-weight: 900;
    background: linear-gradient(90deg, var(--neon-blue), var(--neon-pink));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.overlay-content p {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: #cbd5e1;
}

.overlay-content button.cta-btn {
    background: linear-gradient(90deg, var(--neon-blue), var(--neon-green));
    color: #000000;
    border: none;
    padding: 14px 32px;
    font-family: 'Orbitron', monospace;
    font-size: 1.1rem;
    font-weight: 900;
    border-radius: 10px;
    cursor: pointer;
    box-shadow: 0 0 20px rgba(0, 240, 255, 0.5);
    transition: transform 0.2s, box-shadow 0.2s;
    width: 100%;
}

.overlay-content button.cta-btn:hover {
    transform: scale(1.03);
    box-shadow: 0 0 30px rgba(0, 255, 136, 0.7);
}

.controls-info {
    margin: 18px 0;
    text-align: left;
    background: rgba(0, 0, 0, 0.3);
    padding: 14px;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.controls-info h3 {
    font-family: 'Orbitron', monospace;
    font-size: 0.85rem;
    color: var(--neon-blue);
    text-align: center;
    margin-bottom: 10px;
}

.controls-info p {
    font-size: 0.9rem;
    margin: 4px 0;
    color: #94a3b8;
    display: flex;
    justify-content: space-between;
}

.controls-info span {
    font-weight: 700;
    color: var(--neon-green);
    font-family: monospace;
}

/* Responsiveness */
@media (max-width: 768px) {
    .arcade-title {
        font-size: 1.25rem;
    }
    
    .game-container {
        flex-direction: column;
        align-items: center;
        gap: 10px;
        padding: 10px;
    }

    .sidebar {
        width: 100%;
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 8px;
    }

    .sidebar-box {
        padding: 8px;
    }

    .sidebar-box h2 {
        font-size: 0.65rem;
    }

    .sidebar-box .metric {
        font-size: 1.1rem;
    }

    .sidebar-box.audio-box {
        grid-column: span 4;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    .sidebar-box.audio-box h2 {
        margin: 0;
    }

    .mobile-controls {
        display: flex;
    }
}