@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&family=Cinzel:wght@400;600;700&family=Courier+Prime&display=swap');

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

:root {
    /* Classic Theme (Default) */
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --container-bg: rgba(0, 0, 0, 0.7);
    --primary-color: #4ecdc4;
    --secondary-color: #ff6b6b;
    --text-color: white;
    --canvas-bg: rgba(0, 0, 0, 0.8);
    --panel-bg: rgba(255, 255, 255, 0.1);
    --font-family: 'Arial', sans-serif;
    --border-style: solid;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    --glow: 0 0 20px rgba(78, 205, 196, 0.3);
}

/* Medieval Theme (1400) */
body.medieval {
    --bg-gradient: linear-gradient(135deg, #8B4513 0%, #A0522D 50%, #654321 100%);
    --container-bg: rgba(101, 67, 33, 0.9);
    --primary-color: #DAA520;
    --secondary-color: #B8860B;
    --text-color: #F5DEB3;
    --canvas-bg: rgba(62, 39, 35, 0.9);
    --panel-bg: rgba(218, 165, 32, 0.2);
    --font-family: 'Cinzel', serif;
    --border-style: ridge;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.8);
    --glow: 0 0 20px rgba(218, 165, 32, 0.5);
}

/* Retro Theme (1950s) */
body.retro {
    --bg-gradient: linear-gradient(135deg, #FF6B6B 0%, #4ECDC4 50%, #45B7D1 100%);
    --container-bg: rgba(255, 255, 255, 0.95);
    --primary-color: #FF6B6B;
    --secondary-color: #4ECDC4;
    --text-color: #2C3E50;
    --canvas-bg: rgba(255, 255, 255, 0.9);
    --panel-bg: rgba(255, 107, 107, 0.1);
    --font-family: 'Courier Prime', monospace;
    --border-style: solid;
    --shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    --glow: 0 0 15px rgba(255, 107, 107, 0.3);
}

/* Modern Theme (2020s) */
body.modern {
    --bg-gradient: linear-gradient(135deg, #2C3E50 0%, #34495E 50%, #2C3E50 100%);
    --container-bg: rgba(52, 73, 94, 0.95);
    --primary-color: #3498DB;
    --secondary-color: #E74C3C;
    --text-color: #ECF0F1;
    --canvas-bg: rgba(44, 62, 80, 0.9);
    --panel-bg: rgba(52, 152, 219, 0.1);
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --border-style: solid;
    --shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
    --glow: 0 0 25px rgba(52, 152, 219, 0.4);
}

/* Cyberpunk Theme (2077) */
body.cyberpunk {
    --bg-gradient: linear-gradient(135deg, #0a0a0a 0%, #1a0033 50%, #330066 100%);
    --container-bg: rgba(10, 10, 10, 0.9);
    --primary-color: #00ff41;
    --secondary-color: #ff0080;
    --text-color: #00ff41;
    --canvas-bg: rgba(0, 0, 0, 0.95);
    --panel-bg: rgba(0, 255, 65, 0.1);
    --font-family: 'Orbitron', monospace;
    --border-style: solid;
    --shadow: 0 0 50px rgba(255, 0, 128, 0.5);
    --glow: 0 0 30px rgba(0, 255, 65, 0.6);
}

/* Matrix Theme */
body.matrix {
    --bg-gradient: linear-gradient(135deg, #000000 0%, #001100 50%, #000000 100%);
    --container-bg: rgba(0, 0, 0, 0.95);
    --primary-color: #00ff00;
    --secondary-color: #008800;
    --text-color: #00ff00;
    --canvas-bg: rgba(0, 0, 0, 0.98);
    --panel-bg: rgba(0, 255, 0, 0.05);
    --font-family: 'Courier Prime', monospace;
    --border-style: solid;
    --shadow: 0 0 50px rgba(0, 255, 0, 0.3);
    --glow: 0 0 40px rgba(0, 255, 0, 0.8);
}

/* Islamic Theme */
body.islamic {
    --bg-gradient: linear-gradient(135deg, #1e3a8a 0%, #059669 50%, #dc2626 100%);
    --container-bg: rgba(30, 58, 138, 0.9);
    --primary-color: #fbbf24;
    --secondary-color: #10b981;
    --text-color: #fbbf24;
    --canvas-bg: rgba(30, 58, 138, 0.8);
    --panel-bg: rgba(251, 191, 36, 0.1);
    --font-family: 'Times New Roman', serif;
    --border-style: solid;
    --shadow: 0 10px 30px rgba(251, 191, 36, 0.3);
    --glow: 0 0 25px rgba(251, 191, 36, 0.5);
}

/* Future Theme (30,000) */
body.future {
    --bg-gradient: linear-gradient(135deg, #000033 0%, #000066 25%, #003366 50%, #0066cc 75%, #00ccff 100%);
    --container-bg: rgba(0, 0, 51, 0.9);
    --primary-color: #00ccff;
    --secondary-color: #cc00ff;
    --text-color: #00ccff;
    --canvas-bg: rgba(0, 0, 51, 0.95);
    --panel-bg: rgba(0, 204, 255, 0.1);
    --font-family: 'Orbitron', monospace;
    --border-style: solid;
    --shadow: 0 0 60px rgba(204, 0, 255, 0.6);
    --glow: 0 0 50px rgba(0, 204, 255, 0.8);
}

body {
    font-family: var(--font-family);
    background: var(--bg-gradient);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    color: var(--text-color);
    transition: all 0.5s ease;
}

.game-container {
    display: flex;
    gap: 20px;
    background: var(--container-bg);
    padding: 20px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    border: 2px var(--border-style) var(--primary-color);
    transition: all 0.5s ease;
}

.game-info {
    display: flex;
    flex-direction: column;
    gap: 20px;
    width: 200px;
}

h1 {
    text-align: center;
    font-size: 2rem;
    color: var(--secondary-color);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    font-weight: 900;
    transition: all 0.5s ease;
}

.score-container, .next-piece, .controls, .theme-selector {
    background: var(--panel-bg);
    padding: 15px;
    border-radius: 8px;
    border: 2px var(--border-style) var(--primary-color);
    backdrop-filter: blur(10px);
    transition: all 0.5s ease;
}

.score-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    font-size: 1.1rem;
    color: var(--text-color);
}

.score-item:last-child {
    margin-bottom: 0;
}

.next-piece, .controls, .theme-selector {
    text-align: center;
}

.next-piece h3, .controls h3, .theme-selector h3 {
    margin-bottom: 10px;
    color: var(--primary-color);
    font-weight: 700;
}

#nextCanvas {
    background: var(--canvas-bg);
    border-radius: 5px;
    border: 1px solid var(--primary-color);
}

.controls p {
    margin-bottom: 5px;
    font-size: 0.9rem;
    color: var(--text-color);
}

.theme-selector select {
    width: 100%;
    padding: 8px;
    background: var(--canvas-bg);
    color: var(--text-color);
    border: 1px solid var(--primary-color);
    border-radius: 5px;
    font-family: var(--font-family);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.theme-selector select:hover {
    box-shadow: var(--glow);
}

.theme-selector select option {
    background: var(--canvas-bg);
    color: var(--text-color);
}

.game-board {
    position: relative;
}

#gameCanvas {
    border: 3px var(--border-style) var(--primary-color);
    border-radius: 5px;
    background: var(--canvas-bg);
    box-shadow: var(--glow);
    transition: all 0.5s ease;
}

.game-over, .paused {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--container-bg);
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    border: 2px var(--border-style) var(--secondary-color);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow);
}

.game-over h2, .paused h2 {
    color: var(--secondary-color);
    margin-bottom: 15px;
    font-weight: 700;
}

.game-over button {
    background: var(--primary-color);
    color: var(--canvas-bg);
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    margin-top: 15px;
    transition: all 0.3s ease;
    font-family: var(--font-family);
    font-weight: 600;
}

.game-over button:hover {
    background: var(--secondary-color);
    box-shadow: var(--glow);
}

.hidden {
    display: none;
}

/* Theme-specific animations */
body.cyberpunk h1, body.future h1 {
    animation: glow 2s ease-in-out infinite alternate;
}

body.matrix h1 {
    animation: matrix-glow 1.5s ease-in-out infinite alternate;
}

body.medieval h1 {
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.8), 0 0 10px var(--primary-color);
}

@keyframes glow {
    from { text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5), 0 0 10px var(--secondary-color); }
    to { text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5), 0 0 20px var(--secondary-color), 0 0 30px var(--secondary-color); }
}

@keyframes matrix-glow {
    from { text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5), 0 0 10px #00ff00; }
    to { text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5), 0 0 20px #00ff00, 0 0 30px #00ff00, 0 0 40px #00ff00; }
}

@media (max-width: 768px) {
    .game-container {
        flex-direction: column;
        align-items: center;
    }
    
    .game-info {
        width: 100%;
        max-width: 300px;
    }
    
    h1 {
        font-size: 1.5rem;
    }
}