:root {
    --primary-color: #6C5CE7;
    --secondary-color: #00CEC9;
    --accent-color: #FF7675;
    --bg-gradient: linear-gradient(135deg, #2d3436 0%, #000000 100%);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-primary: #ffffff;
    --text-secondary: #b2bec3;
    --card-radius: 16px;
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.5);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Nunito', sans-serif;
    background: var(--bg-gradient);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden; /* 防止滚动 */
}

.app-container {
    display: grid;
    grid-template-columns: 250px 1fr 250px;
    gap: 20px;
    width: 100%;
    max-width: 1200px;
    height: 90vh;
    padding: 20px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-radius: 30px;
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-lg);
}

/* Header & Sidebar Styles */
.game-header, .game-sidebar {
    display: flex;
    flex-direction: column;
    gap: 20px;
    padding: 10px;
}

.logo h1 {
    font-family: 'Fredoka One', cursive;
    font-size: 2.5rem;
    background: linear-gradient(to right, var(--secondary-color), var(--primary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 2px 10px rgba(108, 92, 231, 0.3);
}

.logo span {
    font-size: 1rem;
    color: var(--text-secondary);
    -webkit-text-fill-color: var(--text-secondary);
}

/* Score Board */
.score-board {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.score-card {
    background: rgba(0, 0, 0, 0.2);
    padding: 15px;
    border-radius: var(--card-radius);
    display: flex;
    flex-direction: column;
    align-items: center;
    border: 1px solid var(--glass-border);
    transition: transform 0.3s;
}

.score-card:hover {
    transform: translateY(-2px);
    background: rgba(0, 0, 0, 0.3);
}

.score-card.best .value {
    color: var(--accent-color);
}

.label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.value {
    font-size: 2rem;
    font-weight: 700;
    font-family: 'Fredoka One', cursive;
}

.speed-status {
    margin-top: 6px;
    font-size: 0.85rem;
    letter-spacing: 1px;
    color: var(--text-secondary);
}

.speed-status.speed-up {
    color: #ffd166;
}

.speed-status.speed-down {
    color: #74b9ff;
}

/* Controls */
.select-wrapper {
    background: rgba(0, 0, 0, 0.2);
    padding: 10px 15px;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
}

.select-wrapper label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 5px;
}

.custom-select {
    width: 100%;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    outline: none;
}

.custom-select option {
    background: #2d3436;
    color: white;
}

/* Main Game Area */
.game-board-wrapper {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    position: relative;
    gap: 12px;
}

.game-topbar {
    width: 100%;
    max-width: 600px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.canvas-container {
    position: relative;
    border-radius: 20px;
    box-shadow: 0 0 50px rgba(0, 0, 0, 0.5);
    border: 4px solid #3a3a3a;
    overflow: hidden;
    background: #1a1a1a;
}

canvas {
    display: block;
    background-color: #1a1a1a;
}

/* Overlay */
.game-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10;
    transition: opacity 0.3s;
}

.overlay-content {
    text-align: center;
    color: white;
}

.overlay-content h2 {
    font-size: 2rem;
    margin-bottom: 10px;
    font-family: 'Fredoka One', cursive;
}

.primary-btn {
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    border: none;
    padding: 12px 40px;
    border-radius: 50px;
    color: white;
    font-size: 1.2rem;
    font-weight: bold;
    cursor: pointer;
    margin-top: 20px;
    box-shadow: 0 4px 15px rgba(108, 92, 231, 0.4);
    transition: all 0.3s;
}

.primary-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(108, 92, 231, 0.6);
}

.pulse {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(108, 92, 231, 0.7); }
    70% { box-shadow: 0 0 0 10px rgba(108, 92, 231, 0); }
    100% { box-shadow: 0 0 0 0 rgba(108, 92, 231, 0); }
}

/* HUD */
.hud-level {
    display: none;
}

.hud-effect {
    position: absolute;
    top: 15px;
    right: 15px;
    background: rgba(255, 118, 117, 0.2);
    color: #ff7675;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: bold;
    border: 1px solid rgba(255, 118, 117, 0.4);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 20px;
}

.action-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: none;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid var(--glass-border);
    display: flex;
    justify-content: center;
    align-items: center;
}

.action-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.action-btn.play { background: linear-gradient(135deg, #00b894, #00cec9); border: none; }
.action-btn.refresh { background: linear-gradient(135deg, #fdcb6e, #e17055); border: none; }
.action-btn.stats { background: linear-gradient(135deg, #a29bfe, #6c5ce7); border: none; }

.level-card {
    background: rgba(0, 0, 0, 0.2);
    padding: 10px 14px;
    border-radius: var(--card-radius);
    border: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin-bottom: 0;
    min-height: 60px;
}

.level-value {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Instructions */
.instructions-card {
    background: rgba(0, 0, 0, 0.2);
    padding: 20px;
    border-radius: var(--card-radius);
    border: 1px solid var(--glass-border);
}

.instructions-card h3 {
    font-size: 1rem;
    margin-bottom: 15px;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 5px;
}

.legend-list {
    list-style: none;
}

.legend-list li {
    display: flex;
    align-items: center;
    margin-bottom: 10px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.legend-icon {
    width: 22px;
    height: 22px;
    margin-right: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    filter: drop-shadow(0 0 6px rgba(255, 255, 255, 0.15));
    flex-shrink: 0;
}

.legend-icon svg {
    width: 20px;
    height: 20px;
    display: block;
}

/* Mobile D-pad */
.mobile-dpad {
    display: none; /* Desktop default */
    grid-template-columns: repeat(3, 1fr);
    gap: 5px;
    width: 180px;
    margin: 0 auto;
}

.dpad-btn {
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
}

.dpad-btn:active {
    background: rgba(255, 255, 255, 0.3);
}

.dpad-btn.up { grid-column: 2; }
.dpad-btn.left { grid-column: 1; grid-row: 2; }
.dpad-btn.down { grid-column: 2; grid-row: 2; }
.dpad-btn.right { grid-column: 3; grid-row: 2; }

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 100;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(5px);
}

.modal-content {
    background: #2d3436;
    padding: 30px;
    border-radius: 20px;
    width: 90%;
    max-width: 400px;
    position: relative;
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-lg);
    text-align: center;
}

.close-modal {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 15px;
    margin-top: 20px;
}

.stat-box {
    background: rgba(0, 0, 0, 0.2);
    padding: 15px;
    border-radius: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Responsive Design */
@media (max-width: 900px) {
    body {
        align-items: stretch;
    }

    .app-container {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
        height: 100vh;
        min-height: 100vh;
        border-radius: 0;
        padding: 2px;
        gap: 2px;
        align-content: start;
    }

    .game-header {
        display: grid;
        grid-template-columns: repeat(4, minmax(0, 1fr));
        gap: 3px;
        align-items: center;
        justify-items: stretch;
        padding: 0;
        width: 100%;
    }

    .logo { grid-column: 1 / -1; justify-self: center; }
    .logo h1 { font-size: 1.1rem; text-align: center; }
    .score-board { display: contents; }
    .score-card { padding: 3px 5px; border-radius: 8px; width: 100%; min-width: 0; height: 44px; justify-content: center; overflow: hidden; }
    .score-card .label { font-size: 0.45rem; letter-spacing: 0.3px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
    .score-card .value { font-size: 0.75rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
    .speed-status { font-size: 0.5rem; margin-top: 0; }

    .game-controls-top { display: contents; }
    .select-wrapper { width: 100%; max-width: none; padding: 4px 6px; height: 44px; display: flex; flex-direction: column; justify-content: center; min-width: 0; overflow: hidden; }
    .select-wrapper label { text-align: center; font-size: 0.55rem; margin-bottom: 1px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
    .custom-select { font-size: 0.8rem; width: 100%; min-width: 0; }
    
    .game-sidebar {
        flex-direction: column;
        align-items: center;
        gap: 4px;
    }

    .mobile-dpad {
        display: grid;
        margin-top: 0;
    }

    .instructions-card {
        display: none; /* Hide on mobile to save space */
    }

    .game-topbar {
        max-width: 100%;
        gap: 8px;
    }

    .level-card {
        width: 100%;
        max-width: 200px;
        margin-bottom: 0;
        padding: 6px 8px;
        min-height: 36px;
    }

    .action-buttons {
        gap: 4px;
        margin-bottom: 0;
    }

    .action-btn {
        width: 36px;
        height: 36px;
        font-size: 0.85rem;
    }

    .game-board-wrapper {
        align-items: stretch;
        gap: 4px;
    }

    .canvas-container {
        width: 100%;
        max-width: 100%;
        aspect-ratio: 1 / 1;
    }

    canvas {
        width: 100%;
        height: 100%;
    }
}

@media (max-width: 600px) {
    .logo h1 { font-size: 1rem; }
    .score-board { display: contents; }
    .score-card { padding: 3px 5px; width: 100%; min-width: 0; height: 42px; justify-content: center; overflow: hidden; }
    .score-card .label { font-size: 0.45rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
    .score-card .value { font-size: 0.7rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
    .speed-status { font-size: 0.5rem; }
    .select-wrapper { width: 100%; max-width: none; padding: 4px 6px; height: 42px; display: flex; flex-direction: column; justify-content: center; min-width: 0; overflow: hidden; }
    .mobile-dpad { width: 132px; gap: 4px; }
    .dpad-btn { width: 34px; height: 34px; font-size: 0.85rem; }
    .overlay-content h2 { font-size: 1.5rem; }
    .primary-btn { padding: 8px 22px; font-size: 0.9rem; }
}