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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: white;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    padding: 20px;
}

.hidden {
    display: none !important;
    visibility: hidden !important;
}

/* Ensure game-controls stays visible when not hidden */
.game-controls:not(.hidden) {
    display: flex !important;
    visibility: visible !important;
    opacity: 1 !important;
}

/* Home Page Styles */
.home-page {
    width: 100%;
    max-width: 600px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 80vh;
}

.home-content {
    text-align: center;
    width: 100%;
    animation: fadeIn 0.5s ease-in;
}

.home-title {
    font-size: 4em;
    color: #333;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
    background: linear-gradient(135deg, #ff6b9d 0%, #ff8fab 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.home-subtitle {
    font-size: 1.5em;
    color: #666;
    margin-bottom: 40px;
}

.home-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin: 40px 0;
    padding: 30px;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border-radius: 15px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-label {
    font-size: 0.9em;
    color: #666;
    margin-bottom: 10px;
    font-weight: 600;
}

.stat-value {
    font-size: 2.5em;
    color: #ff6b9d;
    font-weight: bold;
}

.home-buttons {
    margin: 40px 0;
}

.btn-large {
    padding: 18px 50px;
    font-size: 1.3em;
    font-weight: 700;
    letter-spacing: 1px;
}

.home-instructions {
    margin-top: 50px;
    padding: 30px;
    background: #f8f9fa;
    border-radius: 15px;
    text-align: left;
}

.home-instructions h3 {
    color: #333;
    margin-bottom: 20px;
    text-align: center;
    font-size: 1.5em;
}

.home-instructions ul {
    list-style: none;
    padding: 0;
}

.home-instructions li {
    padding: 10px 0;
    padding-left: 30px;
    position: relative;
    color: #555;
    font-size: 1.1em;
}

.home-instructions li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #ff6b9d;
    font-weight: bold;
    font-size: 1.2em;
}

.theme-selector {
    margin-top: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.theme-selector label {
    font-size: 1em;
    color: #666;
    font-weight: 600;
}

.theme-select {
    padding: 8px 15px;
    border: 2px solid #ff6b9d;
    border-radius: 8px;
    background: white;
    color: #333;
    font-size: 1em;
    font-weight: 500;
    cursor: pointer;
    outline: none;
    transition: all 0.2s ease;
}

.theme-select:hover {
    background: #fff5f8;
    border-color: #ff8fab;
}

.theme-select:focus {
    border-color: #ff6b9d;
    box-shadow: 0 0 0 3px rgba(255, 107, 157, 0.2);
}

/* Dark theme */
body.dark-theme {
    background: #1a1a2e;
    color: #e0e0e0;
}

body.dark-theme .home-title {
    background: linear-gradient(135deg, #ff6b9d 0%, #ff8fab 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

body.dark-theme .home-subtitle {
    color: #b0b0b0;
}

body.dark-theme .home-stats {
    background: linear-gradient(135deg, #16213e 0%, #0f3460 100%);
    border: 1px solid rgba(255, 107, 157, 0.3);
}

body.dark-theme .stat-label {
    color: #b0b0b0;
}

body.dark-theme .stat-value {
    color: #ff6b9d;
}

body.dark-theme .home-instructions {
    background: #16213e;
    border: 1px solid rgba(255, 107, 157, 0.2);
}

body.dark-theme .home-instructions h3 {
    color: #e0e0e0;
}

body.dark-theme .home-instructions li {
    color: #b0b0b0;
}

body.dark-theme .home-instructions li:before {
    color: #ff6b9d;
}

body.dark-theme .theme-select {
    background: #16213e;
    color: #e0e0e0;
    border-color: #ff6b9d;
}

body.dark-theme .theme-select:hover {
    background: #1a2742;
}

body.dark-theme .game-header {
    background: #16213e;
    border-color: #ff6b9d;
    color: #e0e0e0;
}

body.dark-theme .game-header h1 {
    color: #e0e0e0;
}

body.dark-theme .score-panel {
    background: linear-gradient(135deg, #0f3460 0%, #16213e 100%);
}

body.dark-theme .score-item .label {
    color: #b0b0b0;
}

body.dark-theme .score-item .value {
    color: #e0e0e0;
}

body.dark-theme .game-board {
    background: #0f3460;
    box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.5);
}

body.dark-theme .game-controls .btn {
    background: #16213e;
    color: #e0e0e0;
    border-color: #ff6b9d;
}

body.dark-theme .game-controls .btn:hover {
    background: #1a2742;
    border-color: #ff8fab;
}

body.dark-theme .game-over-content {
    background: #16213e;
    color: #e0e0e0;
}

body.dark-theme .game-over-content h2 {
    color: #e0e0e0;
}

body.dark-theme .game-over-content p {
    color: #b0b0b0;
}

body.dark-theme .level-complete-content {
    background: linear-gradient(135deg, #ff6b9d 0%, #ff8fab 100%);
}

.game-header {
    text-align: center;
    margin: 0 auto 20px;
    background: white;
    border: 3px solid #D4AF37;
    border-radius: 15px;
    padding: 10px;
    transform-style: preserve-3d;
    transform: translateZ(10px) rotateX(2deg);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2),
                0 4px 8px rgba(0, 0, 0, 0.15),
                inset 0 2px 0 rgba(255, 255, 255, 0.5),
                inset 0 -2px 4px rgba(212, 175, 55, 0.3),
                0 0 0 1px rgba(212, 175, 55, 0.5);
    position: relative;
    overflow: hidden;
    width: calc(8 * 97.2px + 7 * 2px + 4px); /* Match grid width: 8 cells + 7 gaps + padding */
    max-width: 100%;
    perspective: 1200px;
    perspective-origin: center top;
    display: block;
}

.game-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(212, 175, 55, 0.05) 100%);
    pointer-events: none;
    z-index: 0;
}

.game-header > * {
    position: relative;
    z-index: 1;
}

.game-header h1 {
    color: #333;
    font-size: 1.25em;
    margin: 0;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.music-toggle-btn {
    background: rgba(102, 126, 234, 0.1);
    border: 2px solid rgba(102, 126, 234, 0.3);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 1.2em;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    padding: 0;
    outline: none;
    user-select: none;
    -webkit-user-select: none;
}

.music-toggle-btn:hover {
    background: rgba(102, 126, 234, 0.2);
    border-color: rgba(102, 126, 234, 0.5);
    transform: scale(1.1);
}

.music-toggle-btn:active {
    transform: scale(0.95);
}

/* Volume slider styles */
#music-volume,
#sfx-volume {
    -webkit-appearance: none;
    appearance: none;
    background: rgba(102, 126, 234, 0.2);
    border-radius: 5px;
    outline: none;
    cursor: pointer;
}

#music-volume::-webkit-slider-thumb,
#sfx-volume::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 12px;
    height: 12px;
    background: #667eea;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s ease;
}

#music-volume::-webkit-slider-thumb:hover,
#sfx-volume::-webkit-slider-thumb:hover {
    background: #764ba2;
    transform: scale(1.2);
}

#music-volume::-moz-range-thumb,
#sfx-volume::-moz-range-thumb {
    width: 12px;
    height: 12px;
    background: #667eea;
    border-radius: 50%;
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
}

#music-volume::-moz-range-thumb:hover,
#sfx-volume::-moz-range-thumb:hover {
    background: #764ba2;
    transform: scale(1.2);
}

.score-panel {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 5px;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    padding: 7.5px;
    border-radius: 15px;
    margin-bottom: 5px;
}

.score-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.score-item .label {
    font-size: 0.7em;
    color: #666;
    margin-bottom: 2.5px;
    font-weight: 600;
}

.score-item .value {
    font-size: 1.2em;
    color: #333;
    font-weight: bold;
}

.score-item .moves-info {
    font-size: 0.9em;
    color: #999;
    margin-left: 3px;
    font-weight: normal;
}

.game-board {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    grid-template-rows: repeat(7, 1fr);
    gap: 2px;
    background: white;
    padding: 2px;
    border-radius: 10px;
    box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    transform-style: preserve-3d;
    margin: 20px auto;
    perspective: 1000px;
    perspective-origin: center center;
    width: calc(8 * 97.2px + 7 * 2px + 4px); /* 8 cells + 7 gaps + padding */
    max-width: 100%;
}

.game-board.is-dragging {
    box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.1),
                0 0 30px rgba(100, 150, 255, 0.3);
}

.cell {
    width: 97.2px;
    height: 97.2px;
    border-radius: 12.96px;
    cursor: pointer;
    transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94), 
                box-shadow 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                opacity 0.3s ease;
    display: flex;
    justify-content: center;
    align-items: center;
}

.cell.empty-cell {
    display: none !important;
}
    font-size: 3.24em;
    padding: 0;
    position: relative;
    transform-style: preserve-3d;
    transform: translateZ(0);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3),
                0 2px 4px rgba(0, 0, 0, 0.2),
                inset 0 1px 0 rgba(255, 255, 255, 0.3),
                inset 0 -2px 4px rgba(0, 0, 0, 0.2);
    will-change: transform;
}

.cell:hover {
    transform: scale(1.1) translateY(0) translateZ(10px) rotateX(5deg) rotateY(5deg);
    z-index: 10;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.4),
                0 4px 8px rgba(0, 0, 0, 0.3),
                inset 0 2px 0 rgba(255, 255, 255, 0.4),
                inset 0 -3px 6px rgba(0, 0, 0, 0.3);
    animation: none;
}

.cell.selected {
    transform: scale(1.25) translateZ(20px) rotateX(8deg) rotateY(8deg);
    box-shadow: 0 0 0 6px rgba(255, 255, 255, 1), 
                0 0 20px rgba(100, 150, 255, 0.8),
                0 0 40px rgba(100, 150, 255, 0.6),
                0 12px 24px rgba(0, 0, 0, 0.5),
                inset 0 3px 0 rgba(255, 255, 255, 0.5),
                inset 0 -4px 8px rgba(0, 0, 0, 0.4);
    z-index: 30;
    animation: dragPulse 1s cubic-bezier(0.4, 0, 0.2, 1) infinite;
    border: 3px solid rgba(100, 150, 255, 1);
    transition: transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                box-shadow 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.cell.drag-target {
    transform: scale(1.2) translateZ(15px) rotateX(-4deg) rotateY(-4deg);
    box-shadow: 0 0 0 6px rgba(0, 255, 100, 1),
                0 0 25px rgba(0, 255, 100, 0.9),
                0 0 50px rgba(0, 255, 100, 0.7),
                0 10px 20px rgba(0, 0, 0, 0.5),
                inset 0 2px 0 rgba(255, 255, 255, 0.4),
                inset 0 -3px 6px rgba(0, 0, 0, 0.3);
    z-index: 25;
    animation: targetPulse 0.9s cubic-bezier(0.4, 0, 0.2, 1) infinite;
    border: 3px solid rgba(0, 255, 100, 1);
    background-blend-mode: overlay;
    transition: transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                box-shadow 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.cell.dragging {
    opacity: 0.9;
    z-index: 35;
    transition: opacity 0.2s ease;
}

.cell {
    user-select: none;
    -webkit-user-select: none;
    cursor: grab;
}

.cell:active {
    cursor: grabbing;
}

@keyframes dragPulse {
    0%, 100% {
        transform: scale(1.25) translateZ(20px) rotateX(8deg) rotateY(8deg);
        box-shadow: 0 0 0 6px rgba(255, 255, 255, 1), 
                    0 0 20px rgba(100, 150, 255, 0.8),
                    0 0 40px rgba(100, 150, 255, 0.6),
                    0 12px 24px rgba(0, 0, 0, 0.5),
                    inset 0 3px 0 rgba(255, 255, 255, 0.5),
                    inset 0 -4px 8px rgba(0, 0, 0, 0.4);
    }
    50% {
        transform: scale(1.28) translateZ(22px) rotateX(9deg) rotateY(9deg);
        box-shadow: 0 0 0 7px rgba(255, 255, 255, 1), 
                    0 0 25px rgba(100, 150, 255, 0.9),
                    0 0 50px rgba(100, 150, 255, 0.7),
                    0 13px 26px rgba(0, 0, 0, 0.5),
                    inset 0 3.5px 0 rgba(255, 255, 255, 0.55),
                    inset 0 -4.5px 9px rgba(0, 0, 0, 0.45);
    }
}

@keyframes targetPulse {
    0%, 100% {
        transform: scale(1.2) translateZ(15px) rotateX(-4deg) rotateY(-4deg);
        box-shadow: 0 0 0 6px rgba(0, 255, 100, 1),
                    0 0 25px rgba(0, 255, 100, 0.9),
                    0 0 50px rgba(0, 255, 100, 0.7),
                    0 10px 20px rgba(0, 0, 0, 0.5),
                    inset 0 2px 0 rgba(255, 255, 255, 0.4),
                    inset 0 -3px 6px rgba(0, 0, 0, 0.3);
    }
    50% {
        transform: scale(1.23) translateZ(17px) rotateX(-5deg) rotateY(-5deg);
        box-shadow: 0 0 0 7px rgba(0, 255, 100, 1),
                    0 0 30px rgba(0, 255, 100, 0.95),
                    0 0 60px rgba(0, 255, 100, 0.8),
                    0 11px 22px rgba(0, 0, 0, 0.5),
                    inset 0 2.5px 0 rgba(255, 255, 255, 0.45),
                    inset 0 -3.5px 7px rgba(0, 0, 0, 0.35);
    }
}

/* Drag connection line */
.drag-connection {
    position: absolute;
    pointer-events: none;
    z-index: 20;
    stroke: rgba(100, 150, 255, 0.8);
    stroke-width: 4;
    fill: none;
    stroke-dasharray: 5, 5;
    animation: dashMove 0.5s linear infinite;
}

@keyframes dashMove {
    0% {
        stroke-dashoffset: 0;
    }
    100% {
        stroke-dashoffset: 10;
    }
}

.cell.match-enlarge {
    animation: none;
    z-index: 15;
}

.cell.matched {
    animation: none;
    z-index: 20;
    pointer-events: none;
    position: relative;
    overflow: visible;
    opacity: 0;
    display: none !important;
    visibility: hidden !important;
}

/* Particle styles - dynamically created */
.explosion-particle {
    position: absolute;
    font-size: 8px;
    top: 50%;
    left: 50%;
    z-index: 21;
    pointer-events: none;
    filter: drop-shadow(0 0 3px rgba(255, 215, 0, 1))
            drop-shadow(0 0 6px rgba(255, 165, 0, 0.9))
            drop-shadow(0 0 9px rgba(255, 100, 0, 0.7));
    text-shadow: 0 0 5px rgba(255, 255, 255, 1),
                 0 0 9px rgba(255, 215, 0, 1),
                 0 0 13px rgba(255, 165, 0, 0.9);
    animation: particleExplode 1s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
    --particle-x1: 0px;
    --particle-y1: 0px;
    --particle-x2: 0px;
    --particle-y2: 0px;
    --particle-x3: 0px;
    --particle-y3: 0px;
    --particle-rotate: 0deg;
    --particle-scale: 1;
}

@keyframes particleExplode {
    0% {
        transform: translate(-50%, -50%) scale(0) rotate(0deg);
        opacity: 1;
        filter: brightness(1);
    }
    15% {
        opacity: 1;
        transform: translate(-50%, -50%) translate(var(--particle-x1), var(--particle-y1)) scale(1.3) rotate(calc(var(--particle-rotate) * 0.25));
        filter: brightness(2);
    }
    40% {
        opacity: 1;
        transform: translate(-50%, -50%) translate(var(--particle-x2), var(--particle-y2)) scale(1.5) rotate(calc(var(--particle-rotate) * 0.6));
        filter: brightness(3);
    }
    70% {
        opacity: 0.8;
        transform: translate(-50%, -50%) translate(var(--particle-x3), var(--particle-y3)) scale(calc(var(--particle-scale) * 1.7)) rotate(calc(var(--particle-rotate) * 0.9));
        filter: brightness(2);
    }
    100% {
        opacity: 0;
        transform: translate(-50%, -50%) translate(var(--particle-x3), var(--particle-y3)) scale(calc(var(--particle-scale) * 1.8)) rotate(var(--particle-rotate));
        filter: brightness(0);
    }
}

.cell.falling {
    animation: none;
}

@keyframes enlargeMatch {
    0% {
        transform: scale(1) translateZ(0) rotateX(0deg) rotateY(0deg);
    }
    50% {
        transform: scale(1.25) translateZ(10px) rotateX(6deg) rotateY(6deg);
        box-shadow: 0 0 15px rgba(255, 215, 0, 0.8),
                    0 6px 12px rgba(0, 0, 0, 0.4),
                    inset 0 2px 0 rgba(255, 255, 255, 0.4);
    }
    100% {
        transform: scale(1) translateZ(0) rotateX(0deg) rotateY(0deg);
    }
}

@keyframes matchAnimation {
    0% {
        transform: scale(1) rotate(0deg) translateZ(0) rotateX(0deg) rotateY(0deg);
        opacity: 1;
        filter: brightness(1) saturate(1);
    }
    20% {
        transform: scale(1.3) rotate(60deg) translateZ(15px) rotateX(20deg) rotateY(20deg);
        opacity: 1;
        filter: brightness(2.5) saturate(2);
        box-shadow: 0 0 25px rgba(255, 255, 255, 1),
                    0 0 40px rgba(255, 215, 0, 1),
                    0 0 55px rgba(255, 165, 0, 0.9),
                    0 8px 16px rgba(0, 0, 0, 0.4);
    }
    40% {
        transform: scale(1.4) rotate(120deg) translateZ(20px) rotateX(30deg) rotateY(30deg);
        opacity: 0.9;
        filter: brightness(3) saturate(2.2);
        box-shadow: 0 0 30px rgba(255, 255, 255, 0.95),
                    0 0 50px rgba(255, 215, 0, 0.95),
                    0 0 70px rgba(255, 165, 0, 0.85),
                    0 9px 18px rgba(0, 0, 0, 0.45);
    }
    60% {
        transform: scale(1.2) rotate(180deg) translateZ(15px) rotateX(40deg) rotateY(40deg);
        opacity: 0.7;
        filter: brightness(2) saturate(1.5);
        box-shadow: 0 0 20px rgba(255, 255, 255, 0.8),
                    0 0 35px rgba(255, 215, 0, 0.8),
                    0 0 50px rgba(255, 165, 0, 0.7),
                    0 7px 14px rgba(0, 0, 0, 0.4);
    }
    80% {
        transform: scale(0.8) rotate(240deg) translateZ(8px) rotateX(50deg) rotateY(50deg);
        opacity: 0.4;
        filter: brightness(1.5) saturate(1);
        box-shadow: 0 0 15px rgba(255, 255, 255, 0.6),
                    0 0 25px rgba(255, 215, 0, 0.6),
                    0 0 35px rgba(255, 165, 0, 0.5),
                    0 5px 10px rgba(0, 0, 0, 0.3);
    }
    100% {
        transform: scale(0.3) rotate(300deg) translateZ(0) rotateX(60deg) rotateY(60deg);
        opacity: 0;
        filter: brightness(0.5) saturate(0.5);
        box-shadow: 0 0 0 rgba(255, 255, 255, 0);
    }
}

@keyframes fallAnimation {
    0% {
        transform: translateY(-100%) translateZ(0) rotateX(0deg);
    }
    100% {
        transform: translateY(0) translateZ(0) rotateX(0deg);
    }
}

/* Gem colors with slow idle animations */
.gem-0 { 
    background: white;
    animation: gemFloat 4s ease-in-out infinite;
    animation-delay: 0s;
}
.gem-1 { 
    background: white;
    animation: none;
}
.gem-2 { 
    background: white;
    animation: none;
}
.gem-3 { 
    background: white;
    animation: none;
}
.gem-4 { 
    background: white;
    animation: none;
}
.gem-5 { 
    background: white;
    animation: none;
}

/* Slow floating animation for gems with 3D rotation */
@keyframes gemFloat {
    0%, 100% {
        transform: translateY(0) scale(1) translateZ(0) rotateX(0deg) rotateY(0deg);
        opacity: 1;
    }
    25% {
        transform: translateY(-2px) scale(1.01) translateZ(2px) rotateX(2deg) rotateY(-2deg);
        opacity: 0.98;
    }
    50% {
        transform: translateY(-3px) scale(1.02) translateZ(3px) rotateX(0deg) rotateY(0deg);
        opacity: 0.95;
    }
    75% {
        transform: translateY(-2px) scale(1.01) translateZ(2px) rotateX(-2deg) rotateY(2deg);
        opacity: 0.98;
    }
}

/* Pause gemFloat animation when cell is in certain states */
.cell.selected.gem-0,
.cell.selected.gem-1,
.cell.selected.gem-2,
.cell.selected.gem-3,
.cell.selected.gem-4,
.cell.selected.gem-5,
.cell.dragging.gem-0,
.cell.dragging.gem-1,
.cell.dragging.gem-2,
.cell.dragging.gem-3,
.cell.dragging.gem-4,
.cell.dragging.gem-5,
.cell.drag-target.gem-0,
.cell.drag-target.gem-1,
.cell.drag-target.gem-2,
.cell.drag-target.gem-3,
.cell.drag-target.gem-4,
.cell.drag-target.gem-5,
.cell.matched.gem-0,
.cell.matched.gem-1,
.cell.matched.gem-2,
.cell.matched.gem-3,
.cell.matched.gem-4,
.cell.matched.gem-5 {
    animation: none !important;
}

/* Match enlarge animation - paused */
.cell.match-enlarge {
    animation: none !important;
}

.cell.match-enlarge.gem-0,
.cell.match-enlarge.gem-1,
.cell.match-enlarge.gem-2,
.cell.match-enlarge.gem-3,
.cell.match-enlarge.gem-4,
.cell.match-enlarge.gem-5 {
    animation: none !important;
}

.game-controls {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin: 20px auto;
    width: calc(8 * 97.2px + 7 * 2px + 4px); /* Match grid width: 8 cells + 7 gaps + padding */
    max-width: 100%;
    position: relative;
    z-index: 100;
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
}

.game-controls .btn {
    background: white;
    color: #333;
    border: 2px solid #D4AF37;
    border-radius: 8px;
    font-weight: 500;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: background-color 0.2s ease, 
                box-shadow 0.2s ease,
                transform 0.15s ease;
    user-select: none;
    -webkit-user-select: none;
    pointer-events: auto;
    position: relative;
    outline: none;
    visibility: visible !important;
    opacity: 1 !important;
    display: inline-flex !important;
    z-index: 101;
}

.game-controls .btn:hover {
    background: #f9f9f9;
    box-shadow: 0 3px 6px rgba(212, 175, 55, 0.4);
    transform: translateY(-1px);
}

.game-controls .btn:active {
    background: #f0f0f0;
    box-shadow: 0 1px 2px rgba(212, 175, 55, 0.3);
    transform: translateY(0);
}

.game-controls .btn:focus {
    outline: 2px solid rgba(212, 175, 55, 0.5);
    outline-offset: 2px;
}

.btn {
    padding: 12px 30px;
    font-size: 1em;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    font-weight: 600;
    transition: background-color 0.2s ease,
                box-shadow 0.2s ease,
                transform 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    user-select: none;
    -webkit-user-select: none;
    -webkit-tap-highlight-color: transparent;
    pointer-events: auto;
    position: relative;
    outline: none;
    touch-action: manipulation;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: transform 0.1s ease, box-shadow 0.1s ease;
}

.btn:focus {
    outline: 2px solid rgba(102, 126, 234, 0.5);
    outline-offset: 2px;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
    transform: none !important;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-secondary {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
}

.game-over {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 20px;
    z-index: 1000;
}

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

.game-over-content {
    background: white;
    padding: 40px;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.game-over-content h2 {
    color: #333;
    margin-bottom: 20px;
    font-size: 2.5em;
}

.game-over-content p {
    color: #666;
    font-size: 1.2em;
    margin-bottom: 30px;
}

#final-score {
    color: #667eea;
    font-weight: bold;
    font-size: 1.5em;
}

.game-over-buttons {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 30px;
}

.game-over-buttons .btn {
    width: 100%;
    padding: 15px;
    font-size: 1.1em;
    transition: background-color 0.2s ease,
                box-shadow 0.2s ease,
                transform 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    user-select: none;
    -webkit-user-select: none;
}

.level-complete {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 20px;
    z-index: 1000;
    animation: fadeIn 0.3s ease-in;
}

.level-complete.hidden {
    display: none;
}

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

.level-complete-content {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 50px;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
    color: white;
    max-width: 400px;
    width: 90%;
    animation: slideUp 0.4s ease-out;
}

@keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.level-complete-content h2 {
    color: white;
    margin-bottom: 20px;
    font-size: 2.5em;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.level-complete-content p {
    color: rgba(255, 255, 255, 0.95);
    font-size: 1.3em;
    margin-bottom: 15px;
    font-weight: 500;
}

.level-complete-content span {
    font-weight: bold;
    font-size: 1.2em;
    color: #ffe66d;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

.level-complete-buttons {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 30px;
}

.level-complete-buttons .btn {
    width: 100%;
    padding: 15px;
    font-size: 1.1em;
    transition: background-color 0.2s ease,
                box-shadow 0.2s ease,
                transform 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    user-select: none;
    -webkit-user-select: none;
}

.level-complete-buttons .btn-primary {
    background: white;
    color: #667eea;
}

.level-complete-buttons .btn-primary:hover {
    background: #f0f0f0;
    transform: translateY(-2px);
}

.level-complete-buttons .btn-secondary {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid white;
}

.level-complete-buttons .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Responsive design */
@media (max-width: 600px) {
    .cell {
        width: 40px;
        height: 40px;
        font-size: 1.5em;
    }
    
    .game-header h1 {
        font-size: 2em;
    }
    
    .score-panel {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    .score-item .value {
        font-size: 1.5em;
    }
    
    .score-item .label {
        font-size: 0.8em;
    }
}