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

body {
    font-family: 'Press Start 2P', cursive;
    background-color: #0a0a1a;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    color: #fff;
    overflow-x: hidden;
}

/* ==================== TETRIS PATTERN BACKGROUND ==================== */
.tetris-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.tetris-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        /* Gradient overlay */
        linear-gradient(135deg, rgba(26, 26, 46, 0.95) 0%, rgba(22, 33, 62, 0.9) 50%, rgba(15, 52, 96, 0.95) 100%),
        /* Grid pattern */
        linear-gradient(rgba(74, 105, 189, 0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(74, 105, 189, 0.1) 1px, transparent 1px);
    background-size: 100% 100%, 30px 30px, 30px 30px;
    animation: gridMove 20s linear infinite;
}

.tetris-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 200%;
    height: 200%;
    background-image: 
        /* I-piece */
        linear-gradient(90deg, rgba(0, 245, 255, 0.08) 0%, rgba(0, 245, 255, 0.08) 100%),
        /* O-piece */
        linear-gradient(90deg, rgba(255, 235, 59, 0.08) 0%, rgba(255, 235, 59, 0.08) 100%),
        /* T-piece */
        linear-gradient(90deg, rgba(156, 39, 176, 0.08) 0%, rgba(156, 39, 176, 0.08) 100%),
        /* S-piece */
        linear-gradient(90deg, rgba(76, 175, 80, 0.08) 0%, rgba(76, 175, 80, 0.08) 100%),
        /* Z-piece */
        linear-gradient(90deg, rgba(244, 67, 54, 0.08) 0%, rgba(244, 67, 54, 0.08) 100%),
        /* J-piece */
        linear-gradient(90deg, rgba(33, 150, 243, 0.08) 0%, rgba(33, 150, 243, 0.08) 100%),
        /* L-piece */
        linear-gradient(90deg, rgba(255, 152, 0, 0.08) 0%, rgba(255, 152, 0, 0.08) 100%);
    background-size: 
        120px 30px,
        60px 60px,
        90px 60px,
        90px 60px,
        90px 60px,
        90px 60px,
        90px 60px;
    background-position:
        5% 10%,
        85% 15%,
        15% 75%,
        70% 60%,
        90% 85%,
        25% 40%,
        60% 30%;
    background-repeat: no-repeat;
    animation: floatPieces 30s ease-in-out infinite;
    opacity: 0.5;
}

@keyframes gridMove {
    0% { background-position: 0 0, 0 0, 0 0; }
    100% { background-position: 0 0, 30px 30px, 30px 30px; }
}

@keyframes floatPieces {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    25% { transform: translate(-20px, -30px) rotate(2deg); }
    50% { transform: translate(10px, -20px) rotate(-1deg); }
    75% { transform: translate(-10px, 10px) rotate(1deg); }
}

/* Falling blocks animation for background */
.falling-blocks {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
}

.falling-block {
    position: absolute;
    width: 25px;
    height: 25px;
    opacity: 0.15;
    animation: fall linear infinite;
}

.falling-block:nth-child(1) { left: 5%; animation-duration: 15s; animation-delay: 0s; background: #00f5ff; }
.falling-block:nth-child(2) { left: 15%; animation-duration: 18s; animation-delay: 2s; background: #ffeb3b; }
.falling-block:nth-child(3) { left: 25%; animation-duration: 12s; animation-delay: 4s; background: #9c27b0; }
.falling-block:nth-child(4) { left: 35%; animation-duration: 20s; animation-delay: 1s; background: #4caf50; }
.falling-block:nth-child(5) { left: 45%; animation-duration: 16s; animation-delay: 3s; background: #f44336; }
.falling-block:nth-child(6) { left: 55%; animation-duration: 14s; animation-delay: 5s; background: #2196f3; }
.falling-block:nth-child(7) { left: 65%; animation-duration: 19s; animation-delay: 2s; background: #ff9800; }
.falling-block:nth-child(8) { left: 75%; animation-duration: 17s; animation-delay: 4s; background: #00f5ff; }
.falling-block:nth-child(9) { left: 85%; animation-duration: 13s; animation-delay: 1s; background: #ffeb3b; }
.falling-block:nth-child(10) { left: 95%; animation-duration: 21s; animation-delay: 3s; background: #9c27b0; }

@keyframes fall {
    0% { transform: translateY(-100vh) rotate(0deg); opacity: 0; }
    10% { opacity: 0.15; }
    90% { opacity: 0.15; }
    100% { transform: translateY(100vh) rotate(360deg); opacity: 0; }
}

/* ==================== TITLE SCREEN ==================== */
.title-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
    background: transparent;
}

.title-screen.hidden {
    display: none;
}

.title-content {
    text-align: center;
    position: relative;
    z-index: 10;
}

.title-logo {
    font-size: 4rem;
    margin-bottom: 40px;
    background: linear-gradient(90deg, #ff6b6b, #feca57, #48dbfb, #ff9ff3, #54a0ff, #ff6b6b);
    background-size: 400% 400%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradient 4s ease infinite, pulse 2s ease-in-out infinite;
    text-shadow: 0 0 40px rgba(255, 255, 255, 0.3);
    letter-spacing: 8px;
}

@keyframes gradient {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.02); }
}

/* Floating tetromino pieces */
.title-tetrominos {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
    z-index: -1;
}

.floating-piece {
    position: absolute;
    width: 60px;
    height: 60px;
    opacity: 0.3;
    animation: float 8s ease-in-out infinite;
}

.piece-i { background: #00f5ff; top: 10%; left: 5%; animation-delay: 0s; width: 120px; height: 30px; }
.piece-o { background: #ffeb3b; top: 20%; right: 10%; animation-delay: 1s; }
.piece-t { background: #9c27b0; bottom: 30%; left: 15%; animation-delay: 2s; }
.piece-s { background: #4caf50; top: 60%; right: 20%; animation-delay: 3s; }
.piece-z { background: #f44336; bottom: 20%; right: 5%; animation-delay: 4s; }
.piece-j { background: #2196f3; top: 40%; left: 8%; animation-delay: 5s; }
.piece-l { background: #ff9800; bottom: 10%; left: 30%; animation-delay: 6s; }

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    25% { transform: translateY(-20px) rotate(5deg); }
    50% { transform: translateY(0) rotate(0deg); }
    75% { transform: translateY(20px) rotate(-5deg); }
}

.title-menu {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 30px;
}

.menu-btn {
    font-family: 'Press Start 2P', cursive;
    font-size: 0.9rem;
    padding: 18px 40px;
    background: linear-gradient(180deg, #4a69bd 0%, #3c55a5 100%);
    color: #fff;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 5px 0 #2c3e7a, 0 8px 25px rgba(74, 105, 189, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.menu-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 0 #2c3e7a, 0 12px 30px rgba(74, 105, 189, 0.5);
}

.menu-btn:active {
    transform: translateY(3px);
    box-shadow: 0 2px 0 #2c3e7a, 0 4px 15px rgba(74, 105, 189, 0.3);
}

.menu-btn.small {
    font-size: 0.7rem;
    padding: 12px 25px;
}

.menu-btn.secondary {
    background: linear-gradient(180deg, #555 0%, #333 100%);
    box-shadow: 0 5px 0 #222, 0 8px 25px rgba(0, 0, 0, 0.4);
}

.menu-btn.secondary:hover {
    box-shadow: 0 8px 0 #222, 0 12px 30px rgba(0, 0, 0, 0.5);
}

.menu-btn i {
    font-size: 1.1em;
}

.title-credits {
    font-size: 0.6rem;
    color: #888;
    margin-top: 20px;
}

/* ==================== MODAL STYLES ==================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 200;
    overflow-y: auto;
    padding: 20px;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    border: 3px solid #4a69bd;
    border-radius: 15px;
    padding: 30px 40px;
    text-align: center;
    max-width: 400px;
    width: 100%;
    box-shadow: 0 0 50px rgba(74, 105, 189, 0.5);
    max-height: 90vh;
    overflow-y: auto;
}

.settings-modal-content {
    max-width: 450px;
}

.modal-content h2 {
    font-size: 1.2rem;
    margin-bottom: 25px;
    color: #48dbfb;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

/* ==================== SETTINGS TABS ==================== */
.settings-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    justify-content: center;
}

.tab-btn {
    font-family: 'Press Start 2P', cursive;
    font-size: 0.55rem;
    padding: 10px 15px;
    background: rgba(74, 105, 189, 0.3);
    color: #888;
    border: 2px solid #4a69bd;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.tab-btn:hover {
    background: rgba(74, 105, 189, 0.5);
    color: #fff;
}

.tab-btn.active {
    background: #4a69bd;
    color: #fff;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* ==================== KEYBIND SETTINGS ==================== */
.controls-info {
    font-size: 0.5rem;
    color: #888;
    margin-bottom: 15px;
    padding: 10px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
}

.controls-info p {
    margin: 0;
}

.keybind-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 15px;
}

.keybind-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
}

.keybind-action {
    font-size: 0.55rem;
    color: #feca57;
}

.keybind-btn {
    font-family: 'Press Start 2P', cursive;
    font-size: 0.5rem;
    padding: 8px 15px;
    background: #4a69bd;
    color: #fff;
    border: 2px solid #3c55a5;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    min-width: 80px;
}

.keybind-btn:hover {
    background: #5a79cd;
}

.keybind-btn.listening {
    background: #ff6b6b;
    border-color: #ff4444;
    animation: blink 0.5s ease infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.key-display {
    display: inline-block;
}

.controls-warning {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 10px;
    background: rgba(244, 67, 54, 0.3);
    border: 2px solid #f44336;
    border-radius: 8px;
    margin-top: 15px;
    font-size: 0.5rem;
    color: #ff6b6b;
}

.controls-warning.hidden {
    display: none;
}

.controls-warning i {
    font-size: 1rem;
}

/* ==================== AUDIO SETTINGS ==================== */
.settings-group {
    margin-bottom: 20px;
    text-align: left;
}

.settings-group label {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.65rem;
    margin-bottom: 10px;
    color: #feca57;
}

.slider-container {
    display: flex;
    align-items: center;
    gap: 15px;
}

.slider-container input[type="range"] {
    flex: 1;
}

.slider-container span {
    font-size: 0.6rem;
    min-width: 40px;
    color: #fff;
}

input[type="range"] {
    -webkit-appearance: none;
    height: 8px;
    background: #2c3e7a;
    border-radius: 4px;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    background: #4a69bd;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px rgba(74, 105, 189, 0.5);
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: #4a69bd;
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

/* ==================== HIGH SCORES ==================== */
.title-high-scores {
    list-style: none;
    margin-bottom: 25px;
    counter-reset: score-counter;
}

.title-high-scores li {
    font-size: 0.8rem;
    padding: 10px;
    border-bottom: 1px solid rgba(74, 105, 189, 0.3);
    display: flex;
    align-items: center;
    counter-increment: score-counter;
}

.title-high-scores li::before {
    content: counter(score-counter) ".";
    color: #48dbfb;
    margin-right: 15px;
    min-width: 30px;
}

/* ==================== GAME SCREEN ==================== */
.game-screen {
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.game-screen.hidden {
    display: none;
}

.game-container {
    display: flex;
    gap: 20px;
    align-items: flex-start;
    max-width: 900px;
}

.game-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    margin-bottom: 15px;
    padding: 0 5px;
}

.game-title {
    font-size: 1.5rem;
    text-align: center;
    background: linear-gradient(90deg, #ff6b6b, #feca57, #48dbfb, #ff9ff3, #54a0ff);
    background-size: 300% 300%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradient 3s ease infinite;
}

.icon-btn {
    background: rgba(74, 105, 189, 0.3);
    border: 2px solid #4a69bd;
    border-radius: 8px;
    color: #fff;
    width: 40px;
    height: 40px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

.icon-btn:hover {
    background: rgba(74, 105, 189, 0.5);
    transform: scale(1.1);
}

.game-area {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.canvas-wrapper {
    position: relative;
    border: 4px solid #4a69bd;
    border-radius: 8px;
    box-shadow: 0 0 30px rgba(74, 105, 189, 0.5), inset 0 0 20px rgba(0, 0, 0, 0.5);
    background: #000;
}

#gameCanvas {
    display: block;
    background: #0a0a0a;
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10;
}

.overlay.hidden {
    display: none;
}

.overlay-content {
    text-align: center;
    padding: 20px;
}

.overlay-content h2 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: #ff6b6b;
}

.overlay-content p {
    font-size: 0.7rem;
    margin-bottom: 20px;
    line-height: 1.8;
}

.game-btn {
    font-family: 'Press Start 2P', cursive;
    font-size: 0.7rem;
    padding: 12px 24px;
    background: linear-gradient(180deg, #4a69bd 0%, #3c55a5 100%);
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 4px 0 #2c3e7a, 0 6px 20px rgba(74, 105, 189, 0.4);
    display: block;
    margin: 10px auto;
}

.game-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 0 #2c3e7a, 0 8px 25px rgba(74, 105, 189, 0.5);
}

.game-btn:active {
    transform: translateY(2px);
    box-shadow: 0 2px 0 #2c3e7a, 0 3px 10px rgba(74, 105, 189, 0.3);
}

.game-btn.secondary {
    background: linear-gradient(180deg, #555 0%, #333 100%);
    box-shadow: 0 4px 0 #222, 0 6px 20px rgba(0, 0, 0, 0.4);
}

/* ==================== TOUCH CONTROLS ==================== */
.touch-controls {
    display: none;
    flex-direction: column;
    gap: 10px;
    margin-top: 15px;
    padding: 15px;
    background: rgba(0, 0, 0, 0.4);
    border-radius: 12px;
    border: 2px solid #4a69bd;
}

/* Show touch controls on mobile/tablet OR when explicitly shown */
.touch-controls.show-mobile {
    display: flex;
}

.touch-row {
    display: flex;
    justify-content: center;
    gap: 10px;
}

.touch-btn {
    font-family: 'Press Start 2P', cursive;
    font-size: 1.2rem;
    width: 60px;
    height: 60px;
    background: linear-gradient(180deg, #4a69bd 0%, #3c55a5 100%);
    color: #fff;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.1s ease;
    box-shadow: 0 4px 0 #2c3e7a;
    display: flex;
    align-items: center;
    justify-content: center;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
    touch-action: manipulation;
}

.touch-btn:active {
    transform: translateY(4px);
    box-shadow: 0 0 0 #2c3e7a;
}

.touch-btn.rotate-btn {
    background: linear-gradient(180deg, #9c27b0 0%, #7b1fa2 100%);
    box-shadow: 0 4px 0 #4a148c;
}

.touch-btn.drop-btn {
    width: auto;
    padding: 0 25px;
    font-size: 0.7rem;
    gap: 8px;
    background: linear-gradient(180deg, #f44336 0%, #c62828 100%);
    box-shadow: 0 4px 0 #8b0000;
}

.touch-btn.pause-btn {
    background: linear-gradient(180deg, #ff9800 0%, #e65100 100%);
    box-shadow: 0 4px 0 #bf360c;
}

/* ==================== SIDE PANELS ==================== */
.side-panel {
    background: rgba(0, 0, 0, 0.6);
    border: 3px solid #4a69bd;
    border-radius: 8px;
    padding: 15px;
    min-width: 180px;
    box-shadow: 0 0 20px rgba(74, 105, 189, 0.3);
}

.panel-section {
    margin-bottom: 20px;
}

.panel-section:last-child {
    margin-bottom: 0;
}

.panel-section h3 {
    font-size: 0.7rem;
    color: #48dbfb;
    margin-bottom: 10px;
    text-align: center;
    border-bottom: 2px solid #4a69bd;
    padding-bottom: 8px;
}

#nextCanvas {
    display: block;
    margin: 0 auto;
    background: #0a0a0a;
    border: 2px solid #3c55a5;
    border-radius: 4px;
}

.stat-value {
    font-size: 1.2rem;
    text-align: center;
    color: #feca57;
    padding: 10px;
    background: rgba(0, 0, 0, 0.5);
    border-radius: 4px;
}

.controls-list {
    font-size: 0.5rem;
}

.control-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 0;
    border-bottom: 1px solid rgba(74, 105, 189, 0.3);
}

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

.key {
    background: #4a69bd;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.45rem;
}

.audio-controls {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.audio-control {
    display: flex;
    align-items: center;
    gap: 10px;
}

.audio-control i {
    color: #48dbfb;
    width: 20px;
    text-align: center;
}

.audio-control input[type="range"] {
    flex: 1;
    height: 6px;
}

.high-scores ol {
    list-style: none;
    counter-reset: score-counter;
}

.high-scores li {
    counter-increment: score-counter;
    font-size: 0.6rem;
    padding: 6px 0;
    border-bottom: 1px solid rgba(74, 105, 189, 0.3);
    display: flex;
    align-items: center;
}

.high-scores li::before {
    content: counter(score-counter) ".";
    color: #48dbfb;
    margin-right: 10px;
    min-width: 20px;
}

.high-scores li:last-child {
    border-bottom: none;
}

/* ==================== RESPONSIVE DESIGN ==================== */
@media (max-width: 900px) {
    .game-container {
        flex-direction: column;
        align-items: center;
    }

    .side-panel {
        width: 100%;
        max-width: 350px;
    }

    .left-panel {
        order: 3;
    }

    .game-area {
        order: 1;
    }

    .right-panel {
        order: 2;
    }

    .touch-controls {
        display: flex;
    }
}

@media (max-width: 500px) {
    body {
        padding: 10px;
    }

    .title-logo {
        font-size: 2.5rem;
        letter-spacing: 4px;
    }

    .menu-btn {
        font-size: 0.75rem;
        padding: 15px 30px;
    }

    .game-title {
        font-size: 1.2rem;
    }

    .side-panel {
        min-width: auto;
        padding: 10px;
    }

    .stat-value {
        font-size: 1rem;
    }

    .touch-btn {
        width: 55px;
        height: 55px;
        font-size: 1rem;
    }

    .touch-btn.drop-btn {
        font-size: 0.6rem;
    }

    .floating-piece {
        display: none;
    }

    .modal-content {
        padding: 20px 15px;
    }

    .tab-btn {
        font-size: 0.45rem;
        padding: 8px 10px;
    }

    .keybind-action {
        font-size: 0.5rem;
    }

    .keybind-btn {
        font-size: 0.45rem;
        padding: 6px 10px;
        min-width: 60px;
    }
}

@media (max-width: 350px) {
    .title-logo {
        font-size: 2rem;
    }

    .menu-btn {
        font-size: 0.65rem;
        padding: 12px 20px;
    }
}

/* ==================== ANIMATIONS ==================== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

.modal-content {
    animation: fadeIn 0.3s ease;
}