@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&family=Rajdhani:wght@400;600;700&display=swap');

:root {
    --neon-cyan: #00f5ff;
    --neon-purple: #bf00ff;
    --neon-green: #39ff14;
    --neon-red: #ff0055;
    --neon-gold: #ffd700;
    --dark-bg: #0a0a0f;
    --card-bg: #0f0f1a;
    --card-border: #1a1a2e;
    --wood-color: #3d1f0a;
    --fret-color: #c8a96e;
}

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

body {
    background-color: var(--dark-bg);
    font-family: 'Rajdhani', sans-serif;
    color: #e0e0e0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    overflow-x: hidden;
    background-image:
        radial-gradient(ellipse at 20% 50%, rgba(0, 245, 255, 0.04) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 50%, rgba(191, 0, 255, 0.04) 0%, transparent 50%);
}

body::before {
    content: '';
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image:
        linear-gradient(rgba(0, 245, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 245, 255, 0.03) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
    z-index: 0;
}

.container {
    position: relative;
    z-index: 1;
    width: 95%;
    max-width: 900px;
    margin: 20px auto;
    padding: 30px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    box-shadow:
        0 0 30px rgba(0, 245, 255, 0.08),
        0 0 60px rgba(191, 0, 255, 0.05),
        inset 0 1px 0 rgba(255,255,255,0.05);
}

h1 {
    font-family: 'Orbitron', monospace;
    font-size: clamp(1.4rem, 4vw, 2.2rem);
    font-weight: 900;
    text-align: center;
    margin-bottom: 6px;
    background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 2px;
}

.subtitle {
    text-align: center;
    font-size: 0.85rem;
    color: #555;
    margin-bottom: 20px;
    letter-spacing: 1px;
    text-transform: uppercase;
}

#audioStatus {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 10px 20px;
    margin-bottom: 20px;
    border-radius: 8px;
    background: rgba(0,0,0,0.3);
    border: 1px solid #1a1a2e;
    font-size: 0.85rem;
    font-family: 'Orbitron', monospace;
    letter-spacing: 1px;
}

#audioStatus .dot {
    width: 10px; height: 10px;
    border-radius: 50%;
    background: #333;
    transition: all 0.3s;
    flex-shrink: 0;
}

#audioStatus.listening .dot {
    background: var(--neon-green);
    box-shadow: 0 0 8px var(--neon-green);
    animation: pulse-dot 1s infinite;
}

#audioStatus.error .dot { background: var(--neon-red); box-shadow: 0 0 8px var(--neon-red); }

@keyframes pulse-dot {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.3); opacity: 0.7; }
}

#pitchInfo {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.pitch-card {
    background: rgba(0,0,0,0.4);
    border: 1px solid #1a1a2e;
    border-radius: 10px;
    padding: 8px 20px;
    text-align: center;
    min-width: 100px;
}

.pitch-card .label {
    font-size: 0.65rem;
    color: #555;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 2px;
}

.pitch-card .value {
    font-family: 'Orbitron', monospace;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--neon-cyan);
}

#detectedNoteCard .value { color: var(--neon-purple); font-size: 1.4rem; }
#detectedNoteCard.match .value { color: var(--neon-green); text-shadow: 0 0 10px var(--neon-green); }

#noteDisplay {
    font-family: 'Orbitron', monospace;
    font-size: clamp(3rem, 10vw, 5rem);
    font-weight: 900;
    text-align: center;
    margin: 10px 0;
    min-height: 80px;
    line-height: 1;
    background: linear-gradient(135deg, #fff, var(--neon-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 0 20px rgba(0, 245, 255, 0.5));
    transition: all 0.3s;
}

#noteDisplay.correct-flash {
    background: linear-gradient(135deg, var(--neon-green), #00ff88);
    -webkit-background-clip: text;
    background-clip: text;
    filter: drop-shadow(0 0 25px rgba(57, 255, 20, 0.8));
}

.button-row {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.startButton {
    font-family: 'Orbitron', monospace;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 1px;
    padding: 10px 20px;
    border: 1px solid;
    border-radius: 8px;
    cursor: pointer;
    background: transparent;
    transition: all 0.3s;
    text-transform: uppercase;
}

.startButton[data-interval="4000"] { color: var(--neon-green); border-color: var(--neon-green); }
.startButton[data-interval="4000"]:hover { background: rgba(57, 255, 20, 0.15); box-shadow: 0 0 15px rgba(57, 255, 20, 0.4); }
.startButton[data-interval="3000"] { color: var(--neon-gold); border-color: var(--neon-gold); }
.startButton[data-interval="3000"]:hover { background: rgba(255, 215, 0, 0.15); box-shadow: 0 0 15px rgba(255, 215, 0, 0.4); }
.startButton[data-interval="2000"] { color: var(--neon-red); border-color: var(--neon-red); }
.startButton[data-interval="2000"]:hover { background: rgba(255, 0, 85, 0.15); box-shadow: 0 0 15px rgba(255, 0, 85, 0.4); }
.startButton.active { background: rgba(0, 245, 255, 0.1); border-color: var(--neon-cyan); color: var(--neon-cyan); box-shadow: 0 0 15px rgba(0, 245, 255, 0.4); }

.stats-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
    padding: 10px 16px;
    background: rgba(0,0,0,0.3);
    border-radius: 10px;
    border: 1px solid #1a1a2e;
    flex-wrap: wrap;
    gap: 8px;
}

.stat-item {
    font-family: 'Orbitron', monospace;
    font-size: 0.8rem;
    color: #888;
}

.stat-item span { color: var(--neon-cyan); font-weight: 700; }

.ctrl-btn {
    font-family: 'Orbitron', monospace;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 1px;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    border: 1px solid;
    background: transparent;
    transition: all 0.3s;
    text-transform: uppercase;
}

#pauseButton { color: var(--neon-red); border-color: var(--neon-red); display: none; }
#pauseButton:hover { background: rgba(255, 0, 85, 0.15); box-shadow: 0 0 10px rgba(255,0,85,0.3); }
#micButton { color: var(--neon-cyan); border-color: var(--neon-cyan); }
#micButton:hover { background: rgba(0, 245, 255, 0.15); box-shadow: 0 0 10px rgba(0,245,255,0.3); }
#micButton.active { background: rgba(0, 245, 255, 0.15); box-shadow: 0 0 15px rgba(0, 245, 255, 0.5); }

#fretboard-wrapper { overflow-x: auto; margin-bottom: 8px; border-radius: 10px; padding: 4px; }

#fretboard {
    position: relative;
    min-width: 560px;
    height: 216px;
    background: linear-gradient(180deg, #2a0f02, var(--wood-color) 30%, #5c2e0a 70%, #2a0f02);
    border: 2px solid #8B6914;
    border-radius: 8px;
    display: grid;
    grid-template-columns: repeat(13, 1fr);
    grid-template-rows: repeat(6, 1fr);
    box-shadow: 0 0 20px rgba(0,0,0,0.8), inset 0 0 30px rgba(0,0,0,0.5);
}

.string-line {
    position: absolute;
    width: 100%;
    left: 0;
    z-index: 1;
    border-radius: 2px;
}

.fret-cell {
    border-left: 2px solid var(--fret-color);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 2;
}

.fret-marker {
    width: 24px;
    height: 24px;
    background: radial-gradient(circle at 35% 35%, #555, #222);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border: 1px solid #444;
    font-size: 9px;
    font-weight: 700;
    font-family: 'Orbitron', monospace;
    color: transparent;
    transition: all 0.15s;
    z-index: 3;
    position: relative;
}

.fret-marker:hover {
    background: radial-gradient(circle at 35% 35%, rgba(0, 245, 255, 0.4), rgba(0, 245, 255, 0.1));
    border-color: var(--neon-cyan);
    box-shadow: 0 0 8px rgba(0, 245, 255, 0.6);
    transform: scale(1.2);
    color: var(--neon-cyan);
}

.fret-marker.correct {
    background: radial-gradient(circle at 35% 35%, rgba(57, 255, 20, 0.6), rgba(57, 255, 20, 0.2));
    border-color: var(--neon-green);
    box-shadow: 0 0 12px rgba(57, 255, 20, 0.8);
    color: var(--neon-green);
    transform: scale(1.25);
}

.fret-marker.wrong {
    background: radial-gradient(circle at 35% 35%, rgba(255, 0, 85, 0.5), rgba(255, 0, 85, 0.2));
    border-color: var(--neon-red);
    box-shadow: 0 0 10px rgba(255, 0, 85, 0.7);
    color: var(--neon-red);
    animation: shake 0.3s ease;
}

.fret-marker.audio-detected {
    background: radial-gradient(circle at 35% 35%, rgba(191, 0, 255, 0.5), rgba(191, 0, 255, 0.2));
    border-color: var(--neon-purple);
    box-shadow: 0 0 12px rgba(191, 0, 255, 0.8);
    color: var(--neon-purple);
    transform: scale(1.2);
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.open-string-note {
    font-size: 11px;
    font-weight: 700;
    font-family: 'Orbitron', monospace;
    color: rgba(255,255,255,0.9);
    text-shadow: 0 0 6px rgba(0, 245, 255, 0.8);
    z-index: 3;
}

#fretNumbers { display: flex; min-width: 560px; margin-bottom: 16px; }
.fret-number { font-size: 11px; font-family: 'Orbitron', monospace; color: #444; text-align: center; width: calc(100% / 13); padding-top: 4px; }
.fret-number.marker-fret { color: var(--neon-cyan); opacity: 0.6; }

#progressContainer {
    width: 100%;
    background: rgba(0,0,0,0.5);
    height: 6px;
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 14px;
    border: 1px solid #1a1a2e;
}

#progressBar {
    width: 0;
    height: 100%;
    background: linear-gradient(90deg, var(--neon-cyan), var(--neon-purple));
    border-radius: 3px;
    transition: width 0.1s linear;
    box-shadow: 0 0 8px rgba(0, 245, 255, 0.6);
}

#volumeMeter { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
#volumeMeter .label { font-size: 0.7rem; color: #444; font-family: 'Orbitron', monospace; letter-spacing: 1px; white-space: nowrap; }
#volumeBar { flex: 1; height: 4px; background: rgba(0,0,0,0.5); border-radius: 2px; overflow: hidden; }
#volumeFill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--neon-green), var(--neon-gold)); border-radius: 2px; transition: width 0.05s; }

#gameOverPanel {
    display: none;
    text-align: center;
    padding: 20px;
    background: rgba(0,0,0,0.5);
    border: 1px solid var(--neon-purple);
    border-radius: 12px;
    margin-bottom: 16px;
    box-shadow: 0 0 20px rgba(191, 0, 255, 0.3);
}

#gameOverPanel h2 { font-family: 'Orbitron', monospace; font-size: 1.5rem; color: var(--neon-purple); margin-bottom: 8px; }
#gameOverPanel p { font-size: 1rem; color: #aaa; }
#gameOverPanel .final-score { font-family: 'Orbitron', monospace; font-size: 2.5rem; font-weight: 900; color: var(--neon-cyan); text-shadow: 0 0 20px rgba(0, 245, 255, 0.8); }

#modeIndicator { text-align: center; font-size: 0.75rem; font-family: 'Orbitron', monospace; color: #333; margin-bottom: 10px; letter-spacing: 2px; text-transform: uppercase; }
#modeIndicator.audio-mode { color: var(--neon-purple); }
#modeIndicator.click-mode { color: var(--neon-cyan); }

footer { position: relative; z-index: 1; text-align: center; padding: 16px; font-size: 0.75rem; color: #333; font-family: 'Orbitron', monospace; letter-spacing: 2px; }

@media (max-width: 600px) {
    .container { padding: 16px; }
    .stats-row { justify-content: center; }
    #pitchInfo { gap: 10px; }
    .pitch-card { min-width: 80px; padding: 6px 12px; }
}