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

body {
    background: radial-gradient(circle at 20% 20%, #3b0066, #0c001a 70%);
    background-size: 100% 100%;
    background-attachment: fixed;
    
    font-family: 'Poppins', sans-serif;
    color: white;
    text-align: center;
    min-height: 100vh;
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 10px;
    overflow: hidden;
    position: relative;
}

/* ADDED: Animated Grid Pattern (optional, bisa dihapus kalau ga suka) */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(0, 234, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 0, 255, 0.02) 1px, transparent 1px);
    background-size: 40px 40px;
    animation: gridMove 25s linear infinite;
    z-index: 0;
    pointer-events: none;
}

@keyframes gridMove {
    0% {
        transform: translate(0, 0);
    }
    100% {
        transform: translate(40px, 40px);
    }
}

/* ADDED: Floating gradient blobs for depth */
body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(ellipse at 10% 20%, rgba(0, 234, 255, 0.08), transparent 50%),
        radial-gradient(ellipse at 90% 80%, rgba(255, 0, 255, 0.08), transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(138, 43, 226, 0.05), transparent 60%);
    filter: blur(60px);
    animation: blobFloat 20s ease-in-out infinite;
    z-index: 0;
    pointer-events: none;
}

@keyframes blobFloat {
    0%, 100% {
        transform: translate(0, 0) scale(1);
        opacity: 0.6;
    }
    50% {
        transform: translate(30px, -30px) scale(1.1);
        opacity: 0.8;
    }
}
/* ======================
   GAME CONTAINER
====================== */
.game-container {
    width: 100%;
    max-width: 480px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    transform: scale(0.95);
}

/* ======================
   HEADER - All Centered Vertically
====================== */
.game-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 20px;
    width: 100%;
}

h1 {
    font-size: clamp(42px, 7vw, 68px);
    font-weight: 800;
    text-shadow: 0 0 25px #00eaff, 0 0 45px #0099ff;
    letter-spacing: clamp(4px, 1vw, 8px);
    margin: 0 0 clamp(10px, 1.5vh, 16px) 0;
    line-height: 1;
}

/* Score Container - Centered below title */
.score-container {
    display: flex;
    gap: clamp(10px, 2vw, 14px);
    justify-content: center;
    margin-bottom: clamp(12px, 2vh, 16px);
}

.score-box {
    background: rgba(30, 0, 50, 0.85);
    backdrop-filter: blur(15px);
    border: 2px solid rgba(0, 217, 255, 0.45);
    border-radius: 12px;
    padding: clamp(10px, 1.5vh, 12px) clamp(20px, 3vw, 26px);
    min-width: clamp(85px, 12vw, 105px);
    box-shadow: 
        0 5px 20px rgba(0, 0, 0, 0.4),
        0 0 20px rgba(0, 217, 255, 0.25),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.score-box:hover {
    border-color: rgba(0, 217, 255, 0.7);
    box-shadow: 
        0 5px 20px rgba(0, 0, 0, 0.4),
        0 0 30px rgba(0, 217, 255, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

.score-label {
    font-size: clamp(10px, 1.3vw, 12px);
    text-transform: uppercase;
    color: rgba(0, 234, 255, 0.85);
    letter-spacing: 1.2px;
    margin-bottom: 5px;
    font-weight: 700;
}

.score-value {
    font-size: clamp(22px, 3vw, 28px);
    font-weight: 800;
    color: white;
    text-shadow: 0 0 12px rgba(0, 234, 255, 0.9);
    line-height: 1;
}

/* ======================
   TOP CONTROLS - Icon Buttons (Top Right)
====================== */
.top-controls {
    position: fixed;
    top: clamp(10px, 2vh, 20px);
    right: clamp(10px, 2vw, 20px);
    display: flex;
    gap: clamp(8px, 1.5vw, 12px);
    z-index: 100;
}

.sound-controls {
    position: fixed;
    top: clamp(10px, 2vh, 20px);
    left: clamp(10px, 2vw, 20px);
    display: flex;
    gap: clamp(8px, 1.5vw, 12px);
    z-index: 100;
}

/* Sound Button Styling */
.btn-sound {
    position: relative;
    width: clamp(36px, 6vw, 48px);
    height: clamp(36px, 6vw, 48px);
    padding: 0;
    background: rgba(30, 0, 50, 0.85);
    backdrop-filter: blur(15px);
    border: 2px solid rgba(0, 217, 255, 0.45);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 
        0 4px 18px rgba(0, 0, 0, 0.35),
        0 0 20px rgba(0, 217, 255, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.btn-sound svg {
    width: clamp(18px, 3vw, 24px);
    height: clamp(18px, 3vw, 24px);
    color: rgba(0, 234, 255, 0.9);
    transition: all 0.3s ease;
    position: absolute;
}

/* BG Music Button - Purple */
#btn-sound-bg {
    background: rgba(50, 0, 70, 0.85);
    border-color: rgba(200, 100, 255, 0.45);
}

#btn-sound-bg svg {
    color: rgba(200, 100, 255, 0.9);
}

#btn-sound-bg:hover {
    background: rgba(200, 100, 255, 0.15);
    border-color: rgba(200, 100, 255, 0.8);
    box-shadow: 
        0 6px 25px rgba(0, 0, 0, 0.45),
        0 0 35px rgba(200, 100, 255, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

#btn-sound-bg:hover svg {
    color: rgba(200, 100, 255, 1);
}

/* Pop SFX Button - Cyan */
#btn-sound-pop {
    background: rgba(0, 40, 50, 0.85);
    border-color: rgba(0, 234, 255, 0.45);
}

#btn-sound-pop svg {
    color: rgba(0, 234, 255, 0.9);
}

#btn-sound-pop:hover {
    background: rgba(0, 234, 255, 0.15);
    border-color: rgba(0, 234, 255, 0.8);
    box-shadow: 
        0 6px 25px rgba(0, 0, 0, 0.45),
        0 0 35px rgba(0, 234, 255, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

#btn-sound-pop:hover svg {
    color: rgba(0, 234, 255, 1);
}

/* Merge SFX Button - Orange/Yellow */
#btn-sound-merge {
    background: rgba(60, 30, 0, 0.85);
    border-color: rgba(255, 170, 0, 0.45);
}

#btn-sound-merge svg {
    color: rgba(255, 170, 0, 0.9);
}

#btn-sound-merge:hover {
    background: rgba(255, 170, 0, 0.15);
    border-color: rgba(255, 170, 0, 0.8);
    box-shadow: 
        0 6px 25px rgba(0, 0, 0, 0.45),
        0 0 35px rgba(255, 170, 0, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

#btn-sound-merge:hover svg {
    color: rgba(255, 170, 0, 1);
}

/* Hover & Active States */
.btn-sound:hover {
    transform: translateY(-2px);
}

.btn-sound:active {
    transform: translateY(0);
    box-shadow: 
        0 2px 12px rgba(0, 0, 0, 0.35),
        0 0 20px rgba(0, 234, 255, 0.3),
        inset 0 2px 6px rgba(0, 0, 0, 0.25);
}

/* Muted State - Red with X */
.btn-sound.muted {
    background: rgba(60, 0, 10, 0.85) !important;
    border-color: rgba(255, 50, 50, 0.6) !important;
    box-shadow: 
        0 4px 18px rgba(0, 0, 0, 0.35),
        0 0 20px rgba(255, 50, 50, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.1) !important;
}

.btn-sound.muted svg.sound-icon {
    display: none !important;
}

.btn-sound.muted svg.mute-icon {
    display: block !important;
    color: rgba(255, 80, 80, 0.9) !important;
}

.btn-sound.muted:hover {
    background: rgba(255, 50, 50, 0.2) !important;
    border-color: rgba(255, 80, 80, 0.8) !important;
    box-shadow: 
        0 6px 25px rgba(0, 0, 0, 0.45),
        0 0 35px rgba(255, 50, 50, 0.5),
        inset 0 1px 0 rgba(255, 255, 255, 0.15) !important;
}

.btn-sound.muted:hover svg.mute-icon {
    color: rgba(255, 100, 100, 1) !important;
}

/* Icon Transitions */
.btn-sound svg.sound-icon,
.btn-sound svg.mute-icon {
    transition: all 0.3s ease;
}

.btn-sound:hover svg {
    transform: scale(1.1);
}

/* FORCE tombol sound untuk selalu visible */
.btn-sound-main {
    display: flex !important;
    position: relative !important;
    z-index: 103 !important;
}

.volume-panel {
    position: relative !important;
    z-index: 102 !important;
} 

/* Mobile Responsive */
@media (max-width: 768px) {
    .sound-controls {
        flex-direction: column;
        gap: clamp(6px, 1.2vw, 10px);
    }
}
.icon-btn {
    width: clamp(36px, 6vw, 48px);
    height: clamp(36px, 6vw, 48px);
    padding: 0;
    background: rgba(30, 0, 50, 0.85);
    backdrop-filter: blur(15px);
    border: 2px solid rgba(0, 217, 255, 0.45);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 
        0 4px 18px rgba(0, 0, 0, 0.35),
        0 0 20px rgba(0, 217, 255, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.icon-btn svg {
    width: clamp(18px, 3vw, 24px);
    height: clamp(18px, 3vw, 24px);
    color: rgba(0, 234, 255, 0.9);
    transition: all 0.3s ease;
}

.icon-btn:hover {
    background: rgba(0, 234, 255, 0.15);
    border-color: rgba(0, 234, 255, 0.8);
    box-shadow: 
        0 6px 25px rgba(0, 0, 0, 0.45),
        0 0 35px rgba(0, 234, 255, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

.icon-btn:hover svg {
    color: rgba(0, 234, 255, 1);
    transform: scale(1.1);
}

.btn-restart-icon:hover svg {
    transform: scale(1.1) rotate(180deg);
}

.icon-btn:active {
    transform: translateY(0);
    box-shadow: 
        0 2px 12px rgba(0, 0, 0, 0.35),
        0 0 20px rgba(0, 234, 255, 0.3),
        inset 0 2px 6px rgba(0, 0, 0, 0.25);
}

/* Tutorial Button Specific */
.btn-tutorial {
    background: rgba(50, 0, 70, 0.85);
    border-color: rgba(200, 100, 255, 0.45);
}

.btn-tutorial svg {
    color: rgba(200, 100, 255, 0.9);
}

.btn-tutorial:hover {
    background: rgba(200, 100, 255, 0.15);
    border-color: rgba(200, 100, 255, 0.8);
    box-shadow: 
        0 6px 25px rgba(0, 0, 0, 0.45),
        0 0 35px rgba(200, 100, 255, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

.btn-tutorial:hover svg {
    color: rgba(200, 100, 255, 1);
}

/* ==========================
   BOARD
========================== */
#board {
    width: 100%;
    max-width: min(480px, 85vmin);
    aspect-ratio: 1;
    margin: 0 auto;
    padding: clamp(10px, 2vmin, 18px);
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(4, 1fr);
    gap: clamp(6px, 1.2vmin, 12px);
    background: rgba(30, 0, 50, 0.65);
    backdrop-filter: blur(12px);
    border: 2px solid rgba(0, 217, 255, 0.35);
    border-radius: 20px;
    box-shadow: 
        0 25px 70px rgba(0, 0, 0, 0.6),
        0 0 45px rgba(0, 217, 255, 0.35),
        inset 0 0 35px rgba(0, 217, 255, 0.12);
    animation: glowBorderBoard 3.5s ease-in-out infinite;
    position: relative;
    z-index: 2;
}

@keyframes glowBorderBoard {
    0%, 100% {
        border-color: rgba(0, 217, 255, 0.4);
        box-shadow: 
            0 25px 70px rgba(0, 0, 0, 0.6),
            0 0 45px rgba(0, 217, 255, 0.35),
            inset 0 0 35px rgba(0, 217, 255, 0.12);
    }
    50% {
        border-color: rgba(255, 0, 255, 0.55);
        box-shadow: 
            0 25px 70px rgba(0, 0, 0, 0.6),
            0 0 55px rgba(255, 0, 255, 0.45),
            inset 0 0 45px rgba(255, 0, 255, 0.18);
    }
}

#board::after {
    content: "";
    position: absolute;
    bottom: -40px;
    left: 50%;
    transform: translateX(-50%);
    width: 360px;
    height: 90px;
    background: radial-gradient(ellipse at center, rgba(0,234,255,0.14), transparent 65%);
    filter: blur(35px);
    z-index: -1;
}

/* ======================
   TILE
====================== */
.tile {
    width: 100%;
    height: 100%;
    border-radius: clamp(8px, 1.8vmin, 14px);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(20px, 3.5vmin, 32px);
    font-weight: 800;
    color: white;
    background: rgba(255, 255, 255, 0.07);
    text-shadow: 0 0 12px rgba(255, 255, 255, 0.9);
    transition: transform 0.15s cubic-bezier(.2,.85,.2,1), opacity 0.13s linear, box-shadow 0.13s;
    will-change: transform, opacity, box-shadow;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}

.tile.new {
    animation: pop 0.24s cubic-bezier(.2,.9,.2,1);
}

@keyframes pop {
    0% { transform: scale(0.15); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

.tile.merge {
    animation: mergePop 0.26s ease-out;
    z-index: 3;
}

@keyframes mergePop {
    0% { transform: scale(1); box-shadow: 0 0 8px rgba(255,255,255,0.12); }
    50% { transform: scale(1.2); box-shadow: 0 0 35px rgba(255,255,255,0.4); }
    100% { transform: scale(1); box-shadow: 0 0 8px rgba(255,255,255,0.12); }
}

#board.shake {
    animation: shakeBoard 0.4s;
}

@keyframes shakeBoard {
    0%,100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

/* Tile Colors */
.tile-2 { background: #00eaff55; box-shadow: 0 0 12px #00eaff; }
.tile-4 { background: #00ff9955; box-shadow: 0 0 12px #00ff99; }
.tile-8 { background: #ff00ff55; box-shadow: 0 0 12px #ff00ff; }
.tile-16 { background: #ff006655; box-shadow: 0 0 12px #ff0066; }
.tile-32 { background: #ffaa0055; box-shadow: 0 0 12px #ffaa00; }
.tile-64 { background: #ff000055; box-shadow: 0 0 12px #ff0000; }
.tile-128 { background: #5f00ff55; box-shadow: 0 0 12px #5f00ff; }
.tile-256 { background: #00ffea55; box-shadow: 0 0 12px #00ffea; }
.tile-512 { background: #ff00aa55; box-shadow: 0 0 12px #ff00aa; }
.tile-1024 { background: #00ffaa55; box-shadow: 0 0 12px #00ffaa; }
.tile-2048 { 
    background: #ffd70066; 
    box-shadow: 0 0 18px #ffd700;
    animation: goldShimmer 2.6s infinite;
}

@keyframes goldShimmer {
    0% { box-shadow: 0 0 12px #ffd70066; transform: translateZ(0); }
    50% { box-shadow: 0 0 30px #ffd700aa; transform: translateY(-2px); }
    100% { box-shadow: 0 0 12px #ffd70066; transform: translateZ(0); }
}

/* Enhanced Merge Animation */
.tile.merge {
    animation: mergeBounce 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    z-index: 10;
}

@keyframes mergeBounce {
    0% { 
        transform: scale(1); 
        filter: brightness(1);
    }
    40% { 
        transform: scale(1.25) rotate(5deg); 
        filter: brightness(1.4) drop-shadow(0 0 25px currentColor);
    }
    60% {
        transform: scale(0.95) rotate(-3deg);
        filter: brightness(1.2);
    }
    80% {
        transform: scale(1.08);
        filter: brightness(1.1);
    }
    100% { 
        transform: scale(1) rotate(0deg); 
        filter: brightness(1);
    }
}

/* Particle Effect */
.merge-particle {
    position: fixed;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    pointer-events: none;
    z-index: 9998;
    box-shadow: 
        0 0 10px currentColor,
        0 0 20px currentColor,
        inset 0 0 5px rgba(255, 255, 255, 0.5);
    filter: blur(0.5px);
}

/* Score Popup Animation */
.score-popup {
    animation: scoreFloat 1s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes scoreFloat {
    0% {
        transform: translate(-50%, -50%) scale(0.5);
        opacity: 0;
    }
    30% {
        transform: translate(-50%, -70px) scale(1.2);
        opacity: 1;
    }
    100% {
        transform: translate(-50%, -120px) scale(1);
        opacity: 0;
    }
}

/* Enhanced Tile Glow on Merge */
.tile.merge {
    box-shadow: 
        0 0 30px currentColor,
        0 0 50px currentColor,
        inset 0 0 20px rgba(255, 255, 255, 0.3) !important;
}

/* Smoother New Tile Animation */
.tile.new {
    animation: popIn 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes popIn {
    0% { 
        transform: scale(0) rotate(-180deg); 
        opacity: 0;
        filter: blur(4px);
    }
    70% {
        transform: scale(1.15) rotate(10deg);
        filter: blur(0);
    }
    100% { 
        transform: scale(1) rotate(0deg); 
        opacity: 1;
        filter: blur(0);
    }
}

/* Tile Hover Effect - Make it more interactive */
.tile:not(:empty):hover {
    transform: scale(1.05);
    transition: transform 0.2s ease;
    filter: brightness(1.2);
}

/* Add ripple effect on board when moving */
#board.moving {
    animation: boardPulse 0.3s ease-out;
}

@keyframes boardPulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.01);
    }
}

/* ==========================
   TUTORIAL MODAL
========================== */
.tutorial-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.88);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 998;
    animation: fadeIn 0.3s ease-out;
}

.tutorial-modal {
    background: rgba(20, 0, 40, 0.96);
    backdrop-filter: blur(25px);
    border: 3px solid rgba(200, 100, 255, 0.5);
    border-radius: 24px;
    padding: 45px 50px;
    max-width: 500px;
    width: 90%;
    text-align: center;
    box-shadow: 
        0 35px 90px rgba(0, 0, 0, 0.75),
        0 0 60px rgba(200, 100, 255, 0.4),
        inset 0 0 50px rgba(200, 100, 255, 0.1);
    animation: modalSlideUp 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
    position: relative;
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    width: 36px;
    height: 36px;
    padding: 0;
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close svg {
    width: 20px;
    height: 20px;
    color: rgba(255, 255, 255, 0.7);
}

.modal-close:hover {
    background: rgba(255, 50, 50, 0.2);
    border-color: rgba(255, 50, 50, 0.6);
    transform: rotate(90deg);
}

.modal-close:hover svg {
    color: #ff5050;
}

.tutorial-title {
    font-size: 32px;
    font-weight: 800;
    color: #c864ff;
    text-shadow: 0 0 25px rgba(200, 100, 255, 0.8);
    margin-bottom: 30px;
    letter-spacing: 2px;
}

.tutorial-content {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.tutorial-section h3 {
    font-size: 18px;
    color: rgba(200, 100, 255, 0.9);
    margin-bottom: 15px;
    font-weight: 700;
}

/* Show/Hide based on device */
.mobile-controls {
    display: none;
}

@media (max-width: 768px) {
    .pc-controls {
        display: none !important;
    }
    
    .mobile-controls {
        display: block;
    }
}

/* Keys Display */
.keys-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(20px, 5vw, 40px);
    flex-wrap: nowrap;
}

.keys-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.keys-grid-wasd,
.keys-grid-arrow {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(2, 1fr);
    gap: 8px;
    justify-items: center;
    align-items: center;
}

.keys-separator {
    font-size: clamp(14px, 2.2vw, 18px);
    color: rgba(255, 255, 255, 0.5);
    font-weight: 700;
    padding: 0 clamp(10px, 2vw, 15px);
}

.key-box {
    width: clamp(42px, 6.5vw, 52px);
    height: clamp(42px, 6.5vw, 52px);
    background: rgba(0, 234, 255, 0.15);
    border: 2px solid rgba(0, 234, 255, 0.5);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(17px, 2.8vw, 22px);
    font-weight: 700;
    color: #00eaff;
    text-shadow: 0 0 10px rgba(0, 234, 255, 0.8);
    box-shadow: 
        0 4px 15px rgba(0, 0, 0, 0.3),
        0 0 20px rgba(0, 234, 255, 0.2),
        inset 0 -2px 0 rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.key-empty {
    width: clamp(42px, 6.5vw, 52px);
    height: clamp(42px, 6.5vw, 52px);
    visibility: hidden;
}

.keys-label {
    font-size: clamp(12px, 1.8vw, 14px);
    color: rgba(255, 255, 255, 0.6);
    margin-top: 5px;
    font-weight: 600;
    text-align: center;
}

/* Swipe Demo */
.swipe-demo {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.swipe-icon {
    font-size: 48px;
    animation: swipeAnimation 2s ease-in-out infinite;
}

@keyframes swipeAnimation {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-15px); }
    50% { transform: translateX(0); }
    75% { transform: translateX(15px); }
}

.swipe-demo p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
}

/* Objective Text */
.objective-text {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.85);
    line-height: 1.6;
}

.objective-text strong {
    color: #ffd700;
    text-shadow: 0 0 10px rgba(255, 215, 0, 0.6);
    font-weight: 800;
}

/* ==========================
   GAME OVER MODAL - WITH ICON BUTTONS
========================== */
/* ==========================
   GAME OVER MODAL - REVISED VERSION
   Copy bagian ini dan replace yang lama di 2048.css
========================== */

.game-over-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.93);
    backdrop-filter: blur(15px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 999;
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.game-over-modal {
    background: linear-gradient(145deg, rgba(15, 0, 35, 0.98), rgba(25, 0, 45, 0.98));
    backdrop-filter: blur(30px);
    border: 3px solid rgba(255, 50, 100, 0.5);
    border-radius: 32px;
    padding: 55px 50px 45px;
    max-width: 460px;
    width: 90%;
    text-align: center;
    box-shadow: 
        0 50px 120px rgba(0, 0, 0, 0.85),
        0 0 100px rgba(255, 50, 100, 0.4),
        inset 0 2px 80px rgba(255, 50, 100, 0.06);
    animation: modalSlideUp 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
    position: relative;
}

@keyframes modalSlideUp {
    from { 
        opacity: 0; 
        transform: translateY(60px) scale(0.85);
    }
    to { 
        opacity: 1; 
        transform: translateY(0) scale(1);
    }
}

/* Close Button (X) - Top Right */
.game-over-close {
    position: absolute;
    top: 18px;
    right: 18px;
    width: 38px;
    height: 38px;
    padding: 0;
    background: rgba(255, 255, 255, 0.06);
    border: 2px solid rgba(255, 255, 255, 0.15);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

.game-over-close svg {
    width: 20px;
    height: 20px;
    color: rgba(255, 255, 255, 0.6);
    transition: all 0.3s ease;
}

.game-over-close:hover {
    background: rgba(255, 80, 80, 0.2);
    border-color: rgba(255, 80, 80, 0.6);
    transform: rotate(90deg) scale(1.05);
}

.game-over-close:hover svg {
    color: #ff6666;
}

.game-over-close:active {
    transform: rotate(90deg) scale(0.95);
}

/* Title - Gradient Pink/Red */
.game-over-title {
    font-size: clamp(32px, 5vw, 42px);
    font-weight: 900;
    background: linear-gradient(135deg, #ff3366 0%, #ff6699 50%, #ff99cc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 0 35px rgba(255, 51, 102, 0.5));
    margin-bottom: 12px;
    letter-spacing: 4px;
    text-transform: uppercase;
    line-height: 1.2;
}

/* Subtitle */
.game-over-subtitle {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.5);
    letter-spacing: 2px;
    margin-bottom: 35px;
    font-weight: 600;
    text-transform: uppercase;
}

/* Score Section - PURPLE/VIOLET gradient */
.game-over-score {
    margin: 0 0 38px;
}

.game-over-score-label {
    font-size: 11px;
    text-transform: uppercase;
    color: rgba(200, 100, 255, 0.7);
    letter-spacing: 3px;
    margin-bottom: 14px;
    font-weight: 700;
}

.game-over-score-value {
    font-size: clamp(52px, 8vw, 68px);
    font-weight: 900;
    background: linear-gradient(135deg, #c864ff 0%, #8b5cf6 50%, #a855f7 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 0 30px rgba(200, 100, 255, 0.6));
    margin-bottom: 10px;
    line-height: 1;
    letter-spacing: -2px;
}

/* New High Score Badge - GOLD */
.new-high-score {
    display: inline-block;
    background: linear-gradient(135deg, rgba(255, 215, 0, 0.2), rgba(255, 165, 0, 0.2));
    border: 2.5px solid rgba(255, 215, 0, 0.7);
    color: #ffd700;
    padding: 12px 26px;
    border-radius: 50px;
    font-size: 13px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-top: 18px;
    box-shadow: 
        0 0 35px rgba(255, 215, 0, 0.35),
        inset 0 0 30px rgba(255, 215, 0, 0.1);
    animation: newHighScorePulse 2s ease-in-out infinite;
}

@keyframes newHighScorePulse {
    0%, 100% {
        box-shadow: 
            0 0 30px rgba(255, 215, 0, 0.4),
            inset 0 0 30px rgba(255, 215, 0, 0.1);
        border-color: rgba(255, 215, 0, 0.7);
        transform: scale(1);
    }
    50% {
        box-shadow: 
            0 0 50px rgba(255, 215, 0, 0.7),
            inset 0 0 40px rgba(255, 215, 0, 0.2);
        border-color: rgba(255, 215, 0, 1);
        transform: scale(1.02);
    }
}

/* High Score Display - ORANGE gradient */
.high-score-display {
    margin-top: 28px;
    padding-top: 28px;
    border-top: 2px solid rgba(255, 140, 0, 0.25);
}

.high-score-label {
    font-size: 11px;
    text-transform: uppercase;
    color: rgba(255, 160, 50, 0.7);
    letter-spacing: 2.5px;
    margin-bottom: 10px;
    font-weight: 700;
}

.high-score-value {
    font-size: clamp(34px, 5vw, 42px);
    font-weight: 900;
    background: linear-gradient(135deg, #ff8c00 0%, #ffa500 50%, #ffb347 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 0 20px rgba(255, 140, 0, 0.5));
    line-height: 1;
    letter-spacing: -1px;
}

/* ===========================
   ICON BUTTONS - Enhanced Color
=========================== */
.game-over-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-top: 42px;
}

/* Icon Button Base Style */
.btn-game-icon {
    width: clamp(70px, 10vw, 80px);
    height: clamp(70px, 10vw, 80px);
    padding: 0;
    background: rgba(255, 255, 255, 0.06);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
    box-shadow: 
        0 8px 30px rgba(0, 0, 0, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    position: relative;
    overflow: hidden;
}

.btn-game-icon svg {
    width: clamp(32px, 5vw, 38px);
    height: clamp(32px, 5vw, 38px);
    transition: all 0.3s ease;
    position: relative;
    z-index: 2;
}

/* Shine Effect */
.btn-game-icon::before {
    content: "";
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
    transition: left 0.5s ease;
}

.btn-game-icon:hover::before {
    left: 100%;
}

.btn-game-icon:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.4);
    box-shadow: 
        0 12px 40px rgba(0, 0, 0, 0.5),
        0 0 40px rgba(255, 255, 255, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    transform: translateY(-4px);
}

.btn-game-icon:active {
    transform: translateY(0);
    box-shadow: 
        0 4px 20px rgba(0, 0, 0, 0.4),
        inset 0 2px 8px rgba(0, 0, 0, 0.3);
}

/* Restart Button - EMERALD GREEN */
.btn-restart-game {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.2), rgba(5, 150, 105, 0.2));
    border-color: rgba(16, 185, 129, 0.6);
    box-shadow: 
        0 8px 30px rgba(0, 0, 0, 0.4),
        0 0 30px rgba(16, 185, 129, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.btn-restart-game svg {
    color: #10b981;
    filter: drop-shadow(0 0 12px rgba(16, 185, 129, 0.5));
}

.btn-restart-game:hover {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.3), rgba(5, 150, 105, 0.3));
    border-color: rgba(16, 185, 129, 0.9);
    box-shadow: 
        0 12px 40px rgba(0, 0, 0, 0.5),
        0 0 50px rgba(16, 185, 129, 0.5),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.btn-restart-game:hover svg {
    transform: rotate(180deg);
    color: #34d399;
}

/* Home Button - SKY BLUE */
.btn-home-game {
    background: linear-gradient(135deg, rgba(14, 165, 233, 0.2), rgba(2, 132, 199, 0.2));
    border-color: rgba(14, 165, 233, 0.6);
    box-shadow: 
        0 8px 30px rgba(0, 0, 0, 0.4),
        0 0 30px rgba(14, 165, 233, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.btn-home-game svg {
    color: #0ea5e9;
    filter: drop-shadow(0 0 12px rgba(14, 165, 233, 0.5));
}

.btn-home-game:hover {
    background: linear-gradient(135deg, rgba(14, 165, 233, 0.3), rgba(2, 132, 199, 0.3));
    border-color: rgba(14, 165, 233, 0.9);
    box-shadow: 
        0 12px 40px rgba(0, 0, 0, 0.5),
        0 0 50px rgba(14, 165, 233, 0.5),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.btn-home-game:hover svg {
    transform: scale(1.1);
    color: #38bdf8;
}

/* Responsive Design */
@media (max-width: 480px) {
    .game-over-modal {
        padding: 45px 35px 38px;
    }
    
    .game-over-buttons {
        gap: 12px;
    }
    
    .btn-game-icon {
        width: clamp(65px, 15vw, 75px);
        height: clamp(65px, 15vw, 75px);
    }
    
    .btn-game-icon svg {
        width: clamp(28px, 6vw, 34px);
        height: clamp(28px, 6vw, 34px);
    }
}
/* ==========================
   BACKGROUND EFFECTS
========================== */
.particles {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background:
      radial-gradient(circle at 20% 30%, rgba(0,234,255,0.2), transparent 48%),
      radial-gradient(circle at 80% 70%, rgba(255,0,90,0.2), transparent 48%),
      radial-gradient(circle at 50% 50%, rgba(140,0,255,0.16), transparent 58%),
      radial-gradient(circle at 10% 85%, rgba(0,255,200,0.14), transparent 58%),
      radial-gradient(circle at 90% 15%, rgba(255,0,255,0.17), transparent 48%);
    filter: blur(60px) brightness(125%) saturate(135%);
    animation: particlesFloat 20s ease-in-out infinite alternate;
}

@keyframes particlesFloat {
    0%   { transform: translateY(0px) translateX(0px); }
    50%  { transform: translateY(-30px) translateX(12px); }
    100% { transform: translateY(-45px) translateX(-18px); }
}

.starfield {
    position: fixed;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
    z-index: 1;
}

.starfield span {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(0,255,255,0.85);
    border-radius: 50%;
    filter: blur(2px);
    animation: starMove linear infinite;
}

@keyframes starMove {
    0% { transform: translateY(0); opacity: 0.85; }
    100% { transform: translateY(-750px); opacity: 0; }
}

.cursor-light {
    position: absolute;
    width: 250px;
    height: 250px;
    background: radial-gradient(circle, rgba(0,255,255,0.28), transparent 72%);
    border-radius: 50%;
    pointer-events: none;
    transform: translate(-50%, -50%);
    filter: blur(45px);
    mix-blend-mode: screen;
    opacity: 0.65;
}

.merge-particle {
    position: absolute;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    pointer-events: none;
    opacity: 0.95;
    will-change: transform, opacity;
    filter: blur(1px) drop-shadow(0 0 8px rgba(255,255,255,0.1));
}
/* ==========================
   ENHANCED BACKGROUND EFFECTS

/* Update .particles styling */
.particles {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background:
      radial-gradient(circle at 20% 30%, rgba(0,234,255,0.15), transparent 40%),
      radial-gradient(circle at 80% 70%, rgba(255,0,90,0.15), transparent 40%),
      radial-gradient(circle at 50% 50%, rgba(140,0,255,0.12), transparent 50%),
      radial-gradient(circle at 10% 85%, rgba(0,255,200,0.1), transparent 50%),
      radial-gradient(circle at 90% 15%, rgba(255,0,255,0.13), transparent 40%);
    filter: blur(50px) brightness(110%);
    animation: particlesFloat 18s ease-in-out infinite alternate;
}

@keyframes particlesFloat {
    0%   { 
        transform: translateY(0px) translateX(0px); 
        opacity: 0.8;
    }
    50%  { 
        transform: translateY(-25px) translateX(15px); 
        opacity: 1;
    }
    100% { 
        transform: translateY(-40px) translateX(-20px); 
        opacity: 0.8;
    }
}

/* Enhanced Starfield */
.starfield {
    position: fixed;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
    z-index: 1;
}

.starfield span {
    position: absolute;
    width: 3px;
    height: 3px;
    background: rgba(0,255,255,0.7);
    border-radius: 50%;
    filter: blur(1.5px);
    box-shadow: 0 0 8px rgba(0, 234, 255, 0.6);
    animation: starMove linear infinite;
}

@keyframes starMove {
    0% { 
        transform: translateY(0); 
        opacity: 0.7; 
    }
    100% { 
        transform: translateY(-750px); 
        opacity: 0; 
    }
}

/* Enhanced Cursor Light */
.cursor-light {
    position: absolute;
    width: 280px;
    height: 280px;
    background: radial-gradient(circle, rgba(0,255,255,0.2), rgba(255,0,255,0.15) 50%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    transform: translate(-50%, -50%);
    filter: blur(50px);
    mix-blend-mode: screen;
    opacity: 0.5;
    transition: opacity 0.3s ease;
}

/* ==========================
   RESPONSIVE DESIGN
========================== */

/* Touch hint for mobile only */
.touch-hint {
    display: none;
}

@media (max-width: 768px) {
    .touch-hint {
        display: block;
        position: fixed;
        right: clamp(10px, 2vw, 16px);
        bottom: clamp(10px, 2vh, 16px);
        background: rgba(0, 0, 0, 0.65);
        backdrop-filter: blur(12px);
        padding: clamp(7px, 1.5vw, 9px) clamp(11px, 2vw, 14px);
        border-radius: 10px;
        font-size: clamp(10px, 1.5vw, 11px);
        z-index: 4;
        color: #cfefff;
        border: 1px solid rgba(0, 217, 255, 0.35);
        box-shadow: 0 5px 18px rgba(0, 0, 0, 0.35);
        font-weight: 500;
    }
}

/* ==========================
   ADVANCED SOUND CONTROL
========================== */
.sound-control-container {
    position: fixed;
    top: clamp(10px, 2vh, 20px);
    left: clamp(10px, 2vw, 20px);
    z-index: 101;
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
}

/* Backdrop Overlay untuk Mobile */
.volume-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(8px);
    z-index: 99;
    animation: fadeIn 0.2s ease-out;
}

.volume-backdrop.active {
    display: block;
}

/* Main Sound Button */
.btn-sound-main {
    width: clamp(40px, 6.5vw, 52px);
    height: clamp(40px, 6.5vw, 52px);
    padding: 0;
    background: rgba(30, 0, 50, 0.9);
    backdrop-filter: blur(15px);
    border: 2px solid rgba(0, 217, 255, 0.5);
    border-radius: 14px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 
        0 5px 20px rgba(0, 0, 0, 0.4),
        0 0 25px rgba(0, 217, 255, 0.25),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    position: relative;
}

.btn-sound-main svg {
    width: clamp(20px, 3.5vw, 26px);
    height: clamp(20px, 3.5vw, 26px);
    color: rgba(0, 234, 255, 0.95);
    transition: all 0.3s ease;
    position: absolute;
}

.btn-sound-main:hover {
    background: rgba(0, 234, 255, 0.18);
    border-color: rgba(0, 234, 255, 0.85);
    box-shadow: 
        0 7px 28px rgba(0, 0, 0, 0.5),
        0 0 40px rgba(0, 234, 255, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

.btn-sound-main:hover svg {
    color: rgba(0, 234, 255, 1);
    transform: scale(1.12);
}

.btn-sound-main:active {
    transform: translateY(0);
}

/* Muted State - Red */
.btn-sound-main.all-muted {
    background: rgba(60, 0, 10, 0.9) !important;
    border-color: rgba(255, 60, 60, 0.7) !important;
    box-shadow: 
        0 5px 20px rgba(0, 0, 0, 0.4),
        0 0 25px rgba(255, 60, 60, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.1) !important;
}

.btn-sound-main.all-muted svg {
    color: rgba(255, 80, 80, 0.95) !important;
}

.btn-sound-main.all-muted:hover {
    background: rgba(255, 60, 60, 0.2) !important;
    border-color: rgba(255, 80, 80, 0.9) !important;
}

/* Volume Panel */
.volume-panel {
    display: none;
    background: linear-gradient(145deg, rgba(20, 0, 40, 0.98), rgba(30, 0, 50, 0.98));
    backdrop-filter: blur(25px);
    border: 2px solid rgba(0, 217, 255, 0.4);
    border-radius: 18px;
    padding: 20px 18px;
    min-width: clamp(240px, 30vw, 280px);
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.7),
        0 0 50px rgba(0, 217, 255, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    animation: slideDown 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
    z-index: 102;
}

.volume-panel.active {
    display: block;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-15px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Volume Item */
.volume-item {
    margin-bottom: 18px;
}

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

.volume-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}

.volume-icon {
    width: 18px;
    height: 18px;
    color: rgba(0, 234, 255, 0.8);
}

.volume-label {
    font-size: 13px;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.9);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    flex: 1;
}

.volume-value {
    font-size: 12px;
    font-weight: 700;
    color: rgba(0, 234, 255, 0.9);
    min-width: 40px;
    text-align: right;
}

/* Volume Slider */
.volume-slider {
    width: 100%;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    outline: none;
    cursor: pointer;
    transition: all 0.2s;
}

.volume-slider::-webkit-slider-track {
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
}

.volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: linear-gradient(135deg, #00eaff 0%, #0099ff 100%);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 
        0 2px 10px rgba(0, 234, 255, 0.5),
        0 0 20px rgba(0, 234, 255, 0.3);
    transition: all 0.2s;
}

.volume-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 
        0 4px 15px rgba(0, 234, 255, 0.7),
        0 0 30px rgba(0, 234, 255, 0.5);
}

.volume-slider::-moz-range-track {
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
}

.volume-slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: linear-gradient(135deg, #00eaff 0%, #0099ff 100%);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 
        0 2px 10px rgba(0, 234, 255, 0.5),
        0 0 20px rgba(0, 234, 255, 0.3);
    transition: all 0.2s;
}

.volume-slider::-moz-range-thumb:hover {
    transform: scale(1.2);
}

/* Slider Fill Effect */
.volume-slider {
    background: linear-gradient(to right, 
        rgba(0, 234, 255, 0.3) 0%, 
        rgba(0, 234, 255, 0.3) var(--value, 0%), 
        rgba(255, 255, 255, 0.1) var(--value, 0%), 
        rgba(255, 255, 255, 0.1) 100%);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .volume-panel {
        min-width: clamp(220px, 50vw, 260px);
        padding: 16px 14px;
    }
    
    .volume-item {
        margin-bottom: 14px;
    }
    
    .volume-label {
        font-size: 12px;
    }
    
    .volume-value {
        font-size: 11px;
    }
}