* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #6366F1;
    --primary-dark: #4F46E5;
    --secondary: #10B981;
    --accent: #F59E0B;
    --background: #0F172A;
    --surface: #1E293B;
    --text: #F1F5F9;
    --text-secondary: #94A3B8;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--background);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    padding: 20px;
    overflow-x: hidden;
}

.container {
    max-width: 500px;
    margin: 0 auto;
    padding: 0 10px;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px 0;
}

.logo {
    font-size: 3rem;
    margin-bottom: 10px;
    display: block;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 400;
}

/* Game Area */
.game-area {
    background: var(--surface);
    border-radius: 24px;
    padding: 25px;
    margin-bottom: 25px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.game-container {
    position: relative;
    margin-bottom: 25px;
}

#gameCanvas {
    width: 100%;
    height: 250px;
    background: linear-gradient(180deg, #1a237e 0%, #283593 100%);
    border-radius: 16px;
    display: block;
    border: 2px solid rgba(99, 102, 241, 0.3);
}

.center-line {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-50%);
}

.motion-indicator {
    position: absolute;
    bottom: 15px;
    right: 15px;
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.motion-dot {
    width: 12px;
    height: 12px;
    background: var(--secondary);
    border-radius: 50%;
    transition: transform 0.1s ease;
}

/* Controls */
.control-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    align-items: center;
    margin-bottom: 20px;
}

.btn {
    border: none;
    border-radius: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.1rem;
}

.control-btn {
    flex: 1;
    height: 70px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    font-size: 1.5rem;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.control-btn:active {
    transform: scale(0.95);
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.4);
}

.main-btn {
    padding: 20px 30px;
    background: linear-gradient(135deg, var(--secondary), #059669);
    color: white;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 4px 20px rgba(16, 185, 129, 0.4);
}

.main-btn:active {
    transform: scale(0.95);
}

.btn-icon {
    font-size: 1.2rem;
}

.btn-text {
    font-size: 1rem;
}

/* Control Mode */
.control-mode {
    display: flex;
    gap: 10px;
    justify-content: center;
}

.mode-btn {
    flex: 1;
    padding: 12px;
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    color: var(--text-secondary);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.mode-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* Stats */
.stats-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    margin-bottom: 25px;
}

.stat-card {
    background: var(--surface);
    border-radius: 16px;
    padding: 20px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.stat-icon {
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Instructions */
.instructions {
    margin-bottom: 25px;
}

.instructions h3 {
    text-align: center;
    margin-bottom: 20px;
    color: var(--text);
    font-size: 1.3rem;
}

.instruction-cards {
    display: grid;
    gap: 15px;
}

.instruction-card {
    background: var(--surface);
    border-radius: 16px;
    padding: 20px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.card-icon {
    font-size: 2rem;
    margin-bottom: 12px;
    display: block;
}

.instruction-card h4 {
    color: var(--text);
    margin-bottom: 8px;
    font-size: 1.1rem;
}

.instruction-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Features */
.features {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.feature {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 15px;
    background: var(--surface);
    border-radius: 12px;
    color: var(--text-secondary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.feature-dot {
    width: 8px;
    height: 8px;
    background: var(--secondary);
    border-radius: 50%;
}

/* Animations */
@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.pulse {
    animation: pulse 0.5s ease-in-out;
}

@keyframes glow {
    0%, 100% { box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3); }
    50% { box-shadow: 0 4px 25px rgba(99, 102, 241, 0.6); }
}

.glow {
    animation: glow 1s ease-in-out;
}

@keyframes scorePop {
    0% { transform: scale(1); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

.score-pop {
    animation: scorePop 0.3s ease-in-out;
}

/* Mobile Optimizations */
@media (max-width: 768px) {
    .container {
        padding: 0 5px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    #gameCanvas {
        height: 200px;
    }
    
    .control-btn {
        height: 60px;
        font-size: 1.3rem;
    }
    
    .main-btn {
        padding: 18px 25px;
    }
    
    .stat-card {
        padding: 15px;
    }
    
    .stat-value {
        font-size: 1.5rem;
    }
    
    .game-area {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.8rem;
    }
    
    #gameCanvas {
        height: 180px;
    }
    
    .control-buttons {
        gap: 8px;
    }
    
    .control-btn {
        height: 55px;
    }
    
    .main-btn {
        padding: 16px 20px;
    }
    
    .stats-container {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .instruction-cards {
        grid-template-columns: 1fr;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --background: #0F172A;
        --surface: #1E293B;
    }
}