:root {
    --primary-color: #a18cd1;
    --secondary-color: #fbc2eb;
    --text-color: #2c3e50;
    --bg-color: #f8f9fa;
    --correct-color: #2ecc71;
    --wrong-color: #e74c3c;
    --perfect-color: #f1c40f;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: linear-gradient(120deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--text-color);
}

.container {
    background: white;
    border-radius: 24px;
    padding: 24px;
    width: 95%;
    max-width: 650px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
    position: relative;
    overflow: hidden;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 24px;
}

.title {
    font-size: 24px;
    font-weight: 800;
    background: linear-gradient(120deg, #a18cd1 0%, #fbc2eb 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: 14px;
    color: #7f8c8d;
    margin-top: 4px;
}

.header-buttons {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 12px;
}

.icon-btn {
    background: #f1f2f6;
    border: none;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 18px;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-btn:hover {
    background: #dfe4ea;
    transform: scale(1.1);
}

/* Display Area */
.display-area {
    background: #fdfdfd;
    border: 2px solid #f1f2f6;
    border-radius: 20px;
    padding: 20px;
    margin-bottom: 24px;
    position: relative;
}

.stave-container {
    width: 100%;
    height: 120px;
    margin-bottom: 15px;
}

#stave {
    width: 100%;
    height: 100%;
}

/* Timeline */
.timeline-container {
    width: 100%;
    height: 40px;
    background: #f1f2f6;
    border-radius: 10px;
    position: relative;
    margin: 15px 0;
    overflow: hidden;
}

.playhead {
    position: absolute;
    top: 0;
    left: 0;
    width: 2px;
    height: 100%;
    background: var(--primary-color);
    z-index: 5;
    box-shadow: 0 0 8px rgba(161, 140, 209, 0.5);
}

.markers-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.marker {
    position: absolute;
    top: 50%;
    width: 4px;
    height: 20px;
    transform: translate(-50%, -50%);
    border-radius: 2px;
}

.target-marker {
    background: #bdc3c7;
    height: 24px;
    opacity: 0.5;
}

.user-marker {
    width: 6px;
    height: 28px;
    z-index: 4;
}

.marker-perfect { background: var(--perfect-color); box-shadow: 0 0 10px var(--perfect-color); }
.marker-great { background: var(--correct-color); }
.marker-good { background: #3498db; }
.marker-wrong { background: var(--wrong-color); }

/* Metronome */
.metronome-status {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 10px;
}

.beat-indicator {
    display: flex;
    gap: 8px;
}

.dot {
    width: 12px;
    height: 12px;
    background: #dfe4ea;
    border-radius: 50%;
    transition: all 0.1s;
}

.dot.active {
    background: var(--primary-color);
    transform: scale(1.3);
    box-shadow: 0 0 10px rgba(161, 140, 209, 0.6);
}

.dot.accent {
    background: #ff7675;
}

#bpm-display {
    font-weight: 700;
    color: #7f8c8d;
    font-size: 14px;
}

/* Actions */
.action-area {
    text-align: center;
    margin-bottom: 24px;
}

.feedback-text {
    height: 30px;
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 15px;
    transition: all 0.2s;
}

.main-buttons {
    display: flex;
    justify-content: center;
}

.primary-btn {
    background: linear-gradient(135deg, #a18cd1 0%, #fbc2eb 100%);
    border: none;
    color: white;
    padding: 14px 40px;
    border-radius: 16px;
    font-size: 18px;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 10px 20px rgba(161, 140, 209, 0.3);
    transition: all 0.3s;
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 25px rgba(161, 140, 209, 0.4);
}

.tap-btn {
    width: 200px;
    height: 120px;
    background: #f1f2f6;
    border: 3px solid #dfe4ea;
    border-radius: 24px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: all 0.1s;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.tap-btn:active, .tap-btn.active {
    background: #e1e2e6;
    transform: scale(0.95);
    border-color: var(--primary-color);
}

.tap-label {
    font-size: 32px;
    font-weight: 900;
    color: #7f8c8d;
}

.tap-hint {
    font-size: 12px;
    color: #b2bec3;
    margin-top: 4px;
}

/* Stats */
.stats-bar {
    display: flex;
    justify-content: space-around;
    background: #f8f9fa;
    padding: 15px;
    border-radius: 16px;
}

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

.stat-item .label {
    font-size: 12px;
    color: #95a5a6;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.stat-item .value {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-color);
}

/* Overlays */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255,255,255,0.98);
    z-index: 100;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 0.3s;
}

.overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.overlay-content {
    width: 90%;
    max-width: 450px;
}

.overlay-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.close-btn {
    background: none;
    border: none;
    font-size: 28px;
    cursor: pointer;
    color: #bdc3c7;
}

.setting-item {
    margin-bottom: 20px;
}

.setting-item label {
    display: block;
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 8px;
}

select, input[type="range"] {
    width: 100%;
    padding: 10px;
    border-radius: 8px;
    border: 2px solid #f1f2f6;
}

.range-control {
    display: flex;
    align-items: center;
    gap: 15px;
}

#bpm-value {
    font-weight: 700;
    width: 40px;
}

/* Result Card */
.result-card {
    text-align: center;
    padding: 30px;
    background: white;
    border-radius: 32px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.1);
}

.result-score {
    font-size: 64px;
    font-weight: 900;
    color: var(--primary-color);
    margin: 20px 0;
}

.result-details {
    margin-bottom: 30px;
    color: #7f8c8d;
    line-height: 1.6;
}

.hidden { display: none !important; }

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.pulse {
    animation: pulse 0.5s infinite;
}