* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
    color: white;
    overflow: hidden;
    height: 100vh;
}

#game-container {
    width: 100%;
    height: calc(100vh - 60px);
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.menu-content,
.result-content {
    text-align: center;
    padding: 2rem;
    max-width: 600px;
    width: 90%;
}

.menu-content h2,
.result-content h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: #0d9488;
    text-shadow: 0 0 20px rgba(13, 148, 136, 0.5);
}

.song-list {
    display: grid;
    gap: 1rem;
    margin-bottom: 2rem;
}

.song-btn {
    padding: 1.5rem 2rem;
    font-size: 1.2rem;
    font-family: inherit;
    background: linear-gradient(135deg, rgba(13, 148, 136, 0.2), rgba(13, 148, 136, 0.1));
    border: 2px solid #0d9488;
    border-radius: 12px;
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.song-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: radial-gradient(circle, rgba(13, 148, 136, 0.4), transparent);
    transform: translate(-50%, -50%);
    transition: all 0.4s ease;
    border-radius: 50%;
}

.song-btn:hover::before {
    width: 300%;
    height: 300%;
}

.song-btn:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 10px 30px rgba(13, 148, 136, 0.4);
    border-color: #14b8a6;
}

.controls-info {
    background: rgba(255, 255, 255, 0.05);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid rgba(13, 148, 136, 0.3);
}

.controls-info h3 {
    color: #0d9488;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.controls-info p {
    margin: 0.5rem 0;
    font-size: 1rem;
    opacity: 0.9;
}

kbd {
    background: linear-gradient(135deg, #0d9488, #14b8a6);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-weight: bold;
    margin: 0.25rem;
    display: inline-block;
    box-shadow: 0 4px 10px rgba(13, 148, 136, 0.3);
}

#game-screen {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    perspective: 1000px;
}

#game-header {
    display: flex;
    justify-content: space-around;
    align-items: center;
    padding: 1rem;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 2px solid rgba(13, 148, 136, 0.3);
    z-index: 10;
}

.score-display,
.combo-display,
.accuracy-display {
    font-size: 1.1rem;
    font-weight: bold;
}

.score-display span:first-child,
.combo-display span:first-child,
.accuracy-display span:first-child {
    color: #94a3b8;
    margin-right: 0.5rem;
}

#score,
#combo,
#accuracy {
    color: #0d9488;
    font-size: 1.3rem;
    text-shadow: 0 0 10px rgba(13, 148, 136, 0.5);
}

#combo-multiplier {
    color: #f59e0b;
    font-size: 0.9rem;
    margin-left: 0.3rem;
}

#game-area {
    flex: 1;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    background: radial-gradient(ellipse at center bottom, rgba(13, 148, 136, 0.1), transparent 70%);
}

.track-container {
    display: flex;
    gap: 8px;
    height: 85%;
    width: 90%;
    max-width: 500px;
    position: relative;
    transform-style: preserve-3d;
    transform: rotateX(20deg);
}

.track {
    flex: 1;
    position: relative;
    background: linear-gradient(to bottom, 
        rgba(13, 148, 136, 0.05),
        rgba(13, 148, 136, 0.1) 80%,
        rgba(13, 148, 136, 0.2)
    );
    border-left: 2px solid rgba(13, 148, 136, 0.3);
    border-right: 2px solid rgba(13, 148, 136, 0.3);
    border-radius: 8px;
    overflow: visible;
    box-shadow: 
        inset 0 0 30px rgba(13, 148, 136, 0.1),
        0 0 20px rgba(13, 148, 136, 0.1);
    transform-style: preserve-3d;
}

.track-line {
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, 
        transparent,
        rgba(13, 148, 136, 0.3) 70%,
        rgba(13, 148, 136, 0.5)
    );
    transform: translateX(-50%);
    animation: trackPulse 2s ease-in-out infinite;
}

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

.hit-zone {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 60px;
    border: 3px solid #0d9488;
    border-radius: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(13, 148, 136, 0.1);
    box-shadow: 
        0 0 20px rgba(13, 148, 136, 0.4),
        inset 0 0 15px rgba(13, 148, 136, 0.2);
    transition: all 0.1s ease;
    z-index: 5;
}

.hit-zone.active {
    background: rgba(13, 148, 136, 0.4);
    transform: translateX(-50%) scale(1.1);
    box-shadow: 
        0 0 40px rgba(13, 148, 136, 0.7),
        inset 0 0 25px rgba(13, 148, 136, 0.4);
}

.hit-key {
    font-size: 1.5rem;
    font-weight: bold;
    color: #0d9488;
    text-shadow: 0 0 10px rgba(13, 148, 136, 0.8);
}

.judgment-line {
    position: absolute;
    bottom: 50px;
    left: -4px;
    right: -4px;
    height: 4px;
    background: linear-gradient(90deg, 
        transparent,
        #0d9488 20%,
        #14b8a6 50%,
        #0d9488 80%,
        transparent
    );
    box-shadow: 0 0 20px rgba(13, 148, 136, 0.8);
    z-index: 4;
    animation: judgmentGlow 1s ease-in-out infinite;
}

@keyframes judgmentGlow {
    0%, 100% { 
        box-shadow: 0 0 20px rgba(13, 148, 136, 0.8); 
        opacity: 0.8;
    }
    50% { 
        box-shadow: 0 0 35px rgba(13, 148, 136, 1); 
        opacity: 1;
    }
}

.note {
    position: absolute;
    width: 50px;
    height: 50px;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 50%;
    cursor: pointer;
    transform-style: preserve-3d;
    animation: noteFall linear forwards;
    z-index: 3;
}

.note::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 70%;
    height: 70%;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, 
        rgba(255, 255, 255, 0.8),
        transparent
    );
}

.note.perfect-note {
    background: radial-gradient(circle at 30% 30%, #14b8a6, #0d9488);
    box-shadow: 
        0 0 20px rgba(13, 148, 136, 0.8),
        0 0 40px rgba(13, 148, 136, 0.4),
        inset 0 -5px 15px rgba(0, 0, 0, 0.3);
}

.note.good-note {
    background: radial-gradient(circle at 30% 30%, #fbbf24, #f59e0b);
    box-shadow: 
        0 0 20px rgba(245, 158, 11, 0.8),
        0 0 40px rgba(245, 158, 11, 0.4),
        inset 0 -5px 15px rgba(0, 0, 0, 0.3);
}

@keyframes noteFall {
    from {
        top: -60px;
        transform: translateX(-50%) scale(0.8) rotateZ(0deg);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    to {
        top: calc(100% + 60px);
        transform: translateX(-50%) scale(1) rotateZ(360deg);
        opacity: 0.7;
    }
}

#judgment-display {
    position: absolute;
    top: 30%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 3rem;
    font-weight: bold;
    pointer-events: none;
    z-index: 20;
    text-shadow: 0 0 20px currentColor;
    animation: judgmentPop 0.5s ease-out forwards;
}

@keyframes judgmentPop {
    0% {
        transform: translate(-50%, -50%) scale(0.5);
        opacity: 0;
    }
    30% {
        transform: translate(-50%, -50%) scale(1.3);
        opacity: 1;
    }
    100% {
        transform: translate(-50%, -50%) scale(1) translateY(-30px);
        opacity: 0;
    }
}

.judgment-perfect {
    color: #14b8a6;
}

.judgment-good {
    color: #fbbf24;
}

.judgment-miss {
    color: #ef4444;
}

#effects-container {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 15;
}

.hit-effect {
    position: absolute;
    width: 100px;
    height: 100px;
    border-radius: 50%;
    pointer-events: none;
    animation: hitEffectExpand 0.4s ease-out forwards;
}

.hit-effect.perfect {
    background: radial-gradient(circle, rgba(20, 184, 166, 0.8), transparent 70%);
    box-shadow: 0 0 30px rgba(20, 184, 166, 0.8);
}

.hit-effect.good {
    background: radial-gradient(circle, rgba(251, 191, 36, 0.8), transparent 70%);
    box-shadow: 0 0 30px rgba(251, 191, 36, 0.8);
}

@keyframes hitEffectExpand {
    from {
        transform: translate(-50%, -50%) scale(0);
        opacity: 1;
    }
    to {
        transform: translate(-50%, -50%) scale(2);
        opacity: 0;
    }
}

.combo-burst {
    position: absolute;
    font-size: 2rem;
    font-weight: bold;
    color: #f59e0b;
    pointer-events: none;
    animation: comboBurstAnim 0.8s ease-out forwards;
    text-shadow: 0 0 15px rgba(245, 158, 11, 0.8);
}

@keyframes comboBurstAnim {
    0% {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
    100% {
        transform: translateY(-50px) scale(1.5);
        opacity: 0;
    }
}

#game-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    border-top: 2px solid rgba(13, 148, 136, 0.3);
}

#pause-btn {
    padding: 0.75rem 1.5rem;
    font-family: inherit;
    font-size: 1rem;
    background: rgba(13, 148, 136, 0.2);
    border: 2px solid #0d9488;
    border-radius: 8px;
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
}

#pause-btn:hover {
    background: rgba(13, 148, 136, 0.4);
    transform: scale(1.05);
}

.progress-bar {
    flex: 1;
    margin: 0 2rem;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    overflow: hidden;
}

#progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #0d9488, #14b8a6);
    border-radius: 4px;
    transition: width 0.3s ease;
    box-shadow: 0 0 10px rgba(13, 148, 136, 0.5);
}

.result-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin: 2rem 0;
}

.stat-item {
    background: rgba(255, 255, 255, 0.05);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid rgba(13, 148, 136, 0.2);
}

.stat-item span:first-child {
    display: block;
    color: #94a3b8;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.stat-item span:last-child {
    color: #0d9488;
    font-size: 1.5rem;
    font-weight: bold;
}

.result-grade {
    font-size: 6rem;
    font-weight: bold;
    margin: 1.5rem 0;
    text-shadow: 0 0 30px currentColor;
    animation: gradePop 0.6s ease-out;
}

.grade-s { color: #14b8a6; }
.grade-a { color: #3b82f6; }
.grade-b { color: #8b5cf6; }
.grade-c { color: #f59e0b; }
.grade-d { color: #ef4444; }

@keyframes gradePop {
    from { transform: scale(0) rotate(-180deg); opacity: 0; }
    to { transform: scale(1) rotate(0deg); opacity: 1; }
}

.result-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
}

#retry-btn,
#menu-btn {
    padding: 1rem 2rem;
    font-family: inherit;
    font-size: 1.1rem;
    background: linear-gradient(135deg, rgba(13, 148, 136, 0.2), rgba(13, 148, 136, 0.1));
    border: 2px solid #0d9488;
    border-radius: 12px;
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
}

#retry-btn:hover,
#menu-btn:hover {
    background: rgba(13, 148, 136, 0.4);
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(13, 148, 136, 0.4);
}

@media (max-width: 768px) {
    .track-container {
        gap: 4px;
        width: 95%;
    }

    .hit-zone {
        width: 45px;
        height: 45px;
        bottom: 15px;
    }

    .hit-key {
        font-size: 1.2rem;
    }

    .note {
        width: 38px;
        height: 38px;
    }

    #game-header {
        flex-wrap: wrap;
        gap: 0.5rem;
        padding: 0.75rem;
    }

    .score-display,
    .combo-display,
    .accuracy-display {
        font-size: 0.95rem;
    }

    .song-btn {
        padding: 1.2rem 1.5rem;
        font-size: 1rem;
    }

    .result-stats {
        grid-template-columns: 1fr;
    }

    .result-grade {
        font-size: 4rem;
    }

    kbd {
        padding: 0.3rem 0.7rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .track-container {
        gap: 2px;
    }

    .hit-zone {
        width: 35px;
        height: 35px;
        border-width: 2px;
    }

    .note {
        width: 28px;
        height: 28px;
    }

    .menu-content h2,
    .result-content h2 {
        font-size: 1.8rem;
    }

    #judgment-display {
        font-size: 2rem;
    }
}

.touch-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 100;
    display: none;
}

@media (hover: none) and (pointer: coarse) {
    .touch-overlay {
        display: block;
    }
    
    .touch-zone {
        position: absolute;
        top: 0;
        bottom: 0;
        width: 25%;
        touch-action: manipulation;
    }
    
    .touch-zone:nth-child(1) { left: 0; }
    .touch-zone:nth-child(2) { left: 25%; }
    .touch-zone:nth-child(3) { left: 50%; }
    .touch-zone:nth-child(4) { left: 75%; }
}