/* Modern Puzzle Master Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-gradient: linear-gradient(135deg, #1f2937 0%, #111827 100%);
    --secondary-gradient: linear-gradient(135deg, #7f1d1d 0%, #991b1b 100%);
    --accent-gradient: linear-gradient(135deg, #064e3b 0%, #065f46 100%);
    --puzzle-gradient: linear-gradient(135deg, #374151 0%, #1f2937 100%);
    --success-gradient: linear-gradient(135deg, #059669 0%, #047857 100%);
    --dark-bg: #000000;
    --card-bg: rgba(10, 10, 10, 0.95);
    --card-border: rgba(255, 255, 255, 0.08);
    --text-primary: #e5e5e5;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);
    --success-color: #22c55e;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --shadow-light: 0 4px 16px rgba(0, 0, 0, 0.5);
    --shadow-heavy: 0 8px 24px rgba(0, 0, 0, 0.7);
    --border-radius: 6px;
    --transition: all 0.2s ease;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--dark-bg);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
}

/* Dark Puzzle Background */
.puzzle-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: radial-gradient(circle at 50% 50%, #1a1a1a 0%, #000000 50%, #0a0a0a 100%);
}

/* Game Container */
#gameContainer {
    width: 100vw;
    height: 100vh;
    position: relative;
}

.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
    align-items: center;
    justify-content: center;
}

.screen.active {
    display: flex;
}

/* Main Menu Styles */
#mainMenu {
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(20px);
}

.menu-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, rgba(168, 237, 234, 0.1) 0%, transparent 70%);
}

.menu-content {
    max-width: 500px;
    width: 90%;
    padding: 1.5rem;
    background: var(--card-bg);
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
    border: 1px solid var(--card-border);
    box-shadow: var(--shadow-heavy);
    text-align: center;
}

.menu-header {
    margin-bottom: 2rem;
}

.game-title {
    font-family: 'Poppins', sans-serif;
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.title-icon {
    font-size: 1.2em;
    animation: pulse 2s infinite;
}

.title-text {
    background: var(--puzzle-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.game-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    font-weight: 300;
}

.difficulty-section {
    margin-bottom: 2rem;
}

.section-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.difficulty-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.difficulty-btn {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius);
    padding: 1rem 0.75rem;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.difficulty-btn:hover {
    transform: translateY(-2px);
    border-color: rgba(255, 255, 255, 0.3);
}

.difficulty-btn.selected {
    border-color: var(--puzzle-gradient);
    background: linear-gradient(135deg, rgba(168, 237, 234, 0.1), rgba(254, 214, 227, 0.1));
}

.diff-icon {
    font-size: 1.5rem;
}

.diff-name {
    font-weight: 600;
    font-size: 1.1rem;
}

.diff-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.menu-actions {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.high-scores {
    background: rgba(0, 0, 0, 0.5);
    border-radius: var(--border-radius);
    padding: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.scores-title {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.scores-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.score-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.35rem 0.75rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 4px;
}

.score-rank {
    font-weight: 600;
    color: var(--text-secondary);
}

.score-value {
    font-family: 'Poppins', monospace;
    font-weight: 600;
    color: var(--text-primary);
}

/* Game Screen */
#gameScreen {
    flex-direction: row;
    padding: 1rem;
    gap: 2rem;
}

.game-hud {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    min-width: 200px;
}

.hud-left {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.hud-right {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* HUD Panels */
.score-panel,
.level-panel,
.lines-panel,
.next-panel,
.controls-panel {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 0.75rem;
    backdrop-filter: blur(10px);
    border: 1px solid var(--card-border);
    text-align: center;
}

.panel-title {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.5rem;
}

.score-display,
.level-display,
.lines-display {
    display: flex;
    justify-content: center;
    align-items: center;
}

.score-number,
.level-number,
.lines-number {
    font-family: 'Poppins', monospace;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

#nextPieceCanvas {
    border-radius: 8px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.controls-list {
    display: flex;
    flex-direction: row;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.controls-list .control-item {
    flex: 1;
    min-width: 80px;
    justify-content: center;
    text-align: center;
    padding: 0.25rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 4px;
}

.control-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
}

kbd {
    background: rgba(0, 0, 0, 0.5);
    padding: 0.15rem 0.35rem;
    border-radius: 3px;
    font-size: 0.6rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    min-width: 30px;
    text-align: center;
}

/* Game Area */
.game-area {
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 1;
}

#gameCanvas {
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-heavy);
    background: rgba(0, 0, 0, 0.8);
    border: 2px solid var(--card-border);
}

/* Overlays */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
}

.overlay.hidden {
    display: none;
}

.overlay-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
}

.overlay-content {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    backdrop-filter: blur(10px);
    border: 1px solid var(--card-border);
    box-shadow: var(--shadow-heavy);
    text-align: center;
    z-index: 1;
}

.overlay-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    background: var(--puzzle-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.pause-actions {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Game Over Screen */
#gameOverScreen {
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(20px);
}

.results-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, rgba(168, 237, 234, 0.1) 0%, transparent 70%);
}

.results-content {
    max-width: 500px;
    width: 90%;
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    backdrop-filter: blur(10px);
    border: 1px solid var(--card-border);
    box-shadow: var(--shadow-heavy);
    text-align: center;
}

.results-header {
    margin-bottom: 2rem;
}

.results-title {
    font-family: 'Poppins', sans-serif;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: var(--puzzle-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.final-score {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.5);
    border-radius: var(--border-radius);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.score-icon {
    font-size: 3rem;
}

.score-info {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.score-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

.score-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    font-family: 'Poppins', monospace;
}

.stats-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.summary-stat {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem;
    background: rgba(0, 0, 0, 0.5);
    border-radius: var(--border-radius);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.summary-icon {
    font-size: 1.5rem;
}

.summary-info {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.summary-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

.summary-value {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    font-family: 'Poppins', monospace;
}

.new-record {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
    padding: 1rem;
    background: var(--success-gradient);
    border-radius: var(--border-radius);
    animation: recordGlow 2s ease-in-out infinite;
}

.new-record.hidden {
    display: none;
}

.record-icon {
    font-size: 2rem;
}

.record-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

@keyframes recordGlow {
    0%, 100% { box-shadow: 0 0 20px rgba(168, 237, 234, 0.5); }
    50% { box-shadow: 0 0 30px rgba(254, 214, 227, 0.7); }
}

.results-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn-primary {
    background: var(--puzzle-gradient);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    padding: 0.5rem 1.5rem;
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(168, 237, 234, 0.4);
}

.btn-glow {
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: var(--transition);
}

.btn-primary:hover .btn-glow {
    left: 100%;
}

.btn-secondary {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius);
    padding: 0.5rem 1.5rem;
    font-weight: 500;
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
}

.btn-secondary:hover {
    background: var(--card-bg);
    color: var(--text-primary);
    border-color: rgba(255, 255, 255, 0.3);
}

/* Utility Classes */
.hidden {
    display: none !important;
}

/* Animations */
@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.8; }
}

/* Responsive Design */
@media (max-width: 768px) {
    #gameScreen {
        flex-direction: column;
        padding: 1rem;
        gap: 1rem;
    }
    
    .game-hud {
        flex-direction: row;
        justify-content: space-between;
        min-width: auto;
        width: 100%;
    }
    
    .hud-left,
    .hud-right {
        flex-direction: row;
        gap: 0.5rem;
    }
    
    .score-panel,
    .level-panel,
    .lines-panel,
    .next-panel,
    .controls-panel {
        padding: 0.75rem;
        min-width: 80px;
    }
    
    .score-number,
    .level-number,
    .lines-number {
        font-size: 1.5rem;
    }
    
    #nextPieceCanvas {
        width: 60px;
        height: 60px;
    }
    
    .controls-list {
        gap: 0.25rem;
    }
    
    .control-item {
        font-size: 0.7rem;
    }
    
    .difficulty-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-summary {
        grid-template-columns: 1fr;
    }
    
    .results-actions {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .game-title {
        font-size: 2rem;
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .menu-content {
        padding: 1.5rem;
    }
    
    #gameCanvas {
        width: 250px;
        height: 500px;
    }
    
    .hud-left,
    .hud-right {
        flex-direction: column;
    }
    
    .results-content {
        padding: 1.5rem;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .puzzle-bg {
        animation: none;
    }
}

/* Focus states */
button:focus,
.difficulty-btn:focus {
    outline: 2px solid var(--accent-gradient);
    outline-offset: 2px;
}.puzzle-c
ontrols {
    width: 30%;
    height: 100%;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius);
    border: 1px solid var(--card-border);
    overflow-y: auto;
}

.puzzle-controls .panel-row {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.puzzle-controls .panel-row > * {
    flex: 1;
    min-width: 120px;
}