/* Tetris Game Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #2c3e50;
    background: linear-gradient(135deg, #8e44ad 0%, #3498db 50%, #e74c3c 100%);
    min-height: 100vh;
    position: relative;
}

/* Animated block pattern background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(45deg, rgba(255,255,255,0.05) 25%, transparent 25%),
        linear-gradient(-45deg, rgba(255,255,255,0.05) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, rgba(255,255,255,0.05) 75%),
        linear-gradient(-45deg, transparent 75%, rgba(255,255,255,0.05) 75%);
    background-size: 30px 30px;
    background-position: 0 0, 0 15px, 15px -15px, -15px 0px;
    animation: moveBlocks 20s linear infinite;
    pointer-events: none;
    z-index: -1;
}

@keyframes moveBlocks {
    0% { transform: translate(0, 0); }
    100% { transform: translate(30px, 30px); }
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

header h1 {
    font-size: 3.5rem;
    color: #fff;
    text-shadow: 3px 3px 6px rgba(0, 0, 0, 0.3);
    margin-bottom: 10px;
    font-weight: bold;
    letter-spacing: 2px;
}

.subtitle {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.3rem;
    margin-bottom: 20px;
    font-style: italic;
}

.back-btn {
    display: inline-block;
    margin-top: 15px;
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    text-decoration: none;
    border-radius: 20px;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.back-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

/* Game Container */
.game-container {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 30px;
    align-items: start;
    justify-items: center;
}

/* Game Info (Left Panel) */
.game-info {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    width: 250px;
}

.score-section {
    margin-bottom: 30px;
}

.score-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid #ecf0f1;
}

.score-item:last-child {
    border-bottom: none;
}

.score-item .label {
    color: #7f8c8d;
    font-weight: 500;
}

.score-item .value {
    color: #2c3e50;
    font-weight: bold;
    font-size: 1.2rem;
}

.next-piece {
    margin-bottom: 30px;
    text-align: center;
}

.next-piece h3 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 1.2rem;
}

#nextCanvas {
    border: 2px solid #bdc3c7;
    border-radius: 8px;
    background: #2c3e50;
}

.controls-info h3 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.control-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.control-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 5px 0;
}

.control-item .key {
    background: #34495e;
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-weight: bold;
    font-size: 0.9rem;
    min-width: 50px;
    text-align: center;
}

.control-item .action {
    color: #7f8c8d;
    font-size: 0.9rem;
}

/* Game Board (Center) */
.game-board {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.board-container {
    position: relative;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

#gameCanvas {
    display: block;
    background: #2c3e50;
    border: 3px solid #34495e;
}

.game-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(44, 62, 80, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
}

.overlay-content {
    text-align: center;
    color: white;
    padding: 30px;
}

.overlay-content h2 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    color: #ecf0f1;
}

.overlay-content p {
    font-size: 1.1rem;
    margin-bottom: 25px;
    color: #bdc3c7;
    line-height: 1.5;
}

.game-btn {
    background: linear-gradient(45deg, #e74c3c, #c0392b);
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 25px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin: 5px;
}

.game-btn:hover {
    background: linear-gradient(45deg, #c0392b, #a93226);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(231, 76, 60, 0.4);
}

.game-btn.secondary {
    background: linear-gradient(45deg, #3498db, #2980b9);
}

.game-btn.secondary:hover {
    background: linear-gradient(45deg, #2980b9, #21618c);
}

.game-btn.warning {
    background: linear-gradient(45deg, #f39c12, #e67e22);
}

.game-btn.warning:hover {
    background: linear-gradient(45deg, #e67e22, #d35400);
}

/* Game Settings (Right Panel) */
.game-settings {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    width: 250px;
}

.game-settings h3 {
    color: #2c3e50;
    margin-bottom: 20px;
    text-align: center;
    font-size: 1.3rem;
}

.setting {
    margin-bottom: 20px;
}

.setting:last-child {
    margin-bottom: 0;
}

.setting label {
    display: block;
    color: #2c3e50;
    font-weight: 500;
    margin-bottom: 8px;
}

select {
    width: 100%;
    padding: 8px 12px;
    border: 2px solid #bdc3c7;
    border-radius: 8px;
    background: white;
    color: #2c3e50;
    font-size: 1rem;
    cursor: pointer;
    transition: border-color 0.3s ease;
}

select:focus {
    outline: none;
    border-color: #3498db;
}

.toggle-btn {
    background: #e74c3c;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: bold;
    width: 100%;
}

.toggle-btn.active {
    background: #27ae60;
}

.toggle-btn:hover {
    transform: scale(1.05);
}

/* Footer */
footer {
    text-align: center;
    margin-top: auto;
    padding: 20px 0;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .game-container {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
        gap: 20px;
    }
    
    .game-info, .game-settings {
        width: 100%;
        max-width: 400px;
    }
    
    .game-info {
        order: 2;
    }
    
    .game-board {
        order: 1;
    }
    
    .game-settings {
        order: 3;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    header h1 {
        font-size: 2.5rem;
    }
    
    #gameCanvas {
        width: 250px;
        height: 500px;
    }
    
    #nextCanvas {
        width: 80px;
        height: 80px;
    }
    
    .game-info, .game-settings {
        padding: 15px;
    }
    
    .control-list {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 2rem;
    }
    
    #gameCanvas {
        width: 200px;
        height: 400px;
    }
    
    .overlay-content h2 {
        font-size: 1.8rem;
    }
    
    .game-btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
}

/* Game Animations */
@keyframes lineCleared {
    0% { opacity: 1; }
    50% { opacity: 0.3; background: #f1c40f; }
    100% { opacity: 1; }
}

@keyframes levelUp {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); color: #f1c40f; }
    100% { transform: scale(1); }
}

.line-clear-animation {
    animation: lineCleared 0.5s ease-in-out;
}

.level-up-animation {
    animation: levelUp 0.8s ease-in-out;
}