:root {
    --bg-color: #050510;
    --neon-cyan: #00f3ff;
    --neon-pink: #ff00ea;
    --panel-bg: rgba(15, 15, 35, 0.7);
    --border-color: rgba(0, 243, 255, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    user-select: none;
}

body {
    background-color: var(--bg-color);
    color: white;
    font-family: 'Rajdhani', sans-serif;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.video-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, #1a1a3a 0%, #050510 100%);
    z-index: -1;
}

.game-layout {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
    padding: 2rem;
    backdrop-filter: blur(10px);
}

.side-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    width: 180px;
}

.stat-box, .next-box {
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    padding: 1.2rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
}

.label {
    display: block;
    font-size: 0.9rem;
    color: var(--neon-cyan);
    letter-spacing: 2px;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.value {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.8rem;
    font-weight: 900;
    text-shadow: 0 0 10px var(--neon-cyan);
}

.canvas-container {
    position: relative;
    border: 4px solid var(--border-color);
    border-radius: 8px;
    padding: 10px;
    background: rgba(0, 0, 0, 0.8);
    box-shadow: 0 0 40px rgba(0, 243, 255, 0.15);
}

canvas#tetris {
    display: block;
    background: #000;
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10;
    transition: opacity 0.3s;
}

.overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.panel {
    text-align: center;
    padding: 2rem;
}

.panel h1 {
    font-family: 'Orbitron', sans-serif;
    font-size: 3rem;
    color: var(--neon-cyan);
    text-shadow: 0 0 20px var(--neon-cyan);
    margin-bottom: 1rem;
}

.cyber-btn {
    font-family: 'Orbitron', sans-serif;
    background: transparent;
    color: var(--neon-cyan);
    border: 2px solid var(--neon-cyan);
    padding: 0.8rem 1.5rem;
    font-size: 1.1rem;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.2s;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.cyber-btn:hover {
    background: var(--neon-cyan);
    color: var(--bg-color);
    box-shadow: 0 0 20px var(--neon-cyan);
}

.cyber-btn.primary {
    font-size: 1.3rem;
    padding: 1rem 2.5rem;
    margin-top: 1.5rem;
}

#mute-btn {
    width: 60px;
    height: 60px;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
}

.controls-hint {
    font-size: 0.9rem;
    color: #888;
    line-height: 1.6;
    margin-top: 1rem;
    text-align: center;
}

.controls-hint p span {
    color: var(--neon-cyan);
}

/* 經典方塊外發光 */
.block {
    box-shadow: inset 0 0 8px rgba(255, 255, 255, 0.5);
}