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

:root {
    --bg: #07080a;
    --surface: #0f1115;
    --border: #1e2028;
    --text: #c8cad0;
    --text-dim: #5a5d66;
    --accent: #6ee7b7;
    --accent-dim: rgba(110, 231, 183, 0.15);
    --glow: rgba(110, 231, 183, 0.4);
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Sora', sans-serif;
    overflow: hidden;
    height: 100vh;
    width: 100vw;
}

#upload-overlay {
    position: fixed;
    inset: 0;
    z-index: 100;
    background: var(--bg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: opacity 0.6s ease, visibility 0.6s ease;
}

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

#upload-overlay h1 {
    font-size: 1.6rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 0.3rem;
}

#upload-overlay h1 span {
    color: var(--accent);
}

#upload-overlay p.subtitle {
    color: var(--text-dim);
    font-size: 0.82rem;
    margin-bottom: 2.5rem;
    font-weight: 300;
}

.drop-zone {
    width: 420px;
    height: 200px;
    border: 1.5px dashed var(--border);
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--surface);
    position: relative;
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--accent);
    background: var(--accent-dim);
    box-shadow: 0 0 40px var(--accent-dim);
}

.drop-zone svg {
    width: 40px;
    height: 40px;
    stroke: var(--text-dim);
    margin-bottom: 1rem;
    transition: stroke 0.3s;
}

.drop-zone:hover svg {
    stroke: var(--accent);
}

.drop-zone span {
    font-size: 0.85rem;
    color: var(--text-dim);
    font-weight: 300;
}

.drop-zone span em {
    color: var(--accent);
    font-style: normal;
    font-weight: 400;
}

.drop-zone input {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

.format-note {
    margin-top: 1rem;
    font-size: 0.7rem;
    color: var(--text-dim);
    font-family: 'JetBrains Mono', monospace;
    letter-spacing: 0.04em;
}

#hud {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 50;
    display: flex;
    align-items: center;
    gap: 16px;
    background: rgba(15, 17, 21, 0.85);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 10px 20px;
    opacity: 0;
    transition: opacity 0.5s ease;
}

#hud.visible {
    opacity: 1;
}

#hud button {
    background: none;
    border: 1px solid var(--border);
    color: var(--text);
    width: 36px;
    height: 36px;
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    font-size: 1rem;
}

#hud button:hover {
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: 0 0 12px var(--accent-dim);
}

#song-title {
    font-size: 0.75rem;
    color: var(--text-dim);
    font-family: 'JetBrains Mono', monospace;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

#time-display {
    font-size: 0.7rem;
    color: var(--text-dim);
    font-family: 'JetBrains Mono', monospace;
    min-width: 80px;
    text-align: center;
}

.seek-bar {
    width: 180px;
    height: 3px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--border);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}

.seek-bar::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 10px;
    height: 10px;
    background: var(--accent);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--glow);
}

#info-panel {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 50;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    color: var(--text-dim);
    text-align: right;
    line-height: 1.7;
    opacity: 0;
    transition: opacity 0.5s ease;
}

#info-panel.visible {
    opacity: 1;
}

#info-panel .label {
    color: var(--text-dim);
}

#info-panel .value {
    color: var(--accent);
}

#info-panel .beat-dot {
    display: inline-block;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
    opacity: 0;
    transition: opacity 0.08s;
    vertical-align: middle;
    margin-left: 4px;
    box-shadow: 0 0 8px var(--glow);
}

#info-panel .beat-dot.on {
    opacity: 1;
}

#eq-panel {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 50;
    background: rgba(15, 17, 21, 0.85);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 14px 18px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    color: var(--text-dim);
    opacity: 0;
    transition: opacity 0.5s ease;
    min-width: 240px;
}

#eq-panel.visible {
    opacity: 1;
}

#eq-panel .eq-title {
    color: var(--text);
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
}

#eq-panel .eq-row {
    display: grid;
    grid-template-columns: 32px 1fr 48px 24px;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}

#eq-panel .eq-auto {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-dim);
    width: 22px;
    height: 22px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.7rem;
    padding: 0;
    line-height: 1;
    font-family: inherit;
    transition: all 0.15s;
}

#eq-panel .eq-auto:hover {
    border-color: var(--accent);
    color: var(--accent);
}

#eq-panel .eq-auto.on {
    background: var(--accent-dim);
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: 0 0 6px var(--glow);
}

#eq-panel .eq-row:last-child {
    margin-bottom: 0;
}

#eq-panel .eq-row label {
    color: var(--text-dim);
}

#eq-panel input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    height: 3px;
    background: var(--border);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
    width: 100%;
}

#eq-panel input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 11px;
    height: 11px;
    background: var(--accent);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--glow);
    cursor: pointer;
}

#eq-panel input[type="range"]::-moz-range-thumb {
    width: 11px;
    height: 11px;
    background: var(--accent);
    border: none;
    border-radius: 50%;
    box-shadow: 0 0 8px var(--glow);
    cursor: pointer;
}

#eq-panel .eq-value {
    color: var(--accent);
    text-align: right;
    font-variant-numeric: tabular-nums;
}

#error-toast {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 200;
    background: #2d1215;
    border: 1px solid #5c2b2e;
    color: #f0a0a0;
    padding: 10px 20px;
    border-radius: 10px;
    font-size: 0.8rem;
    font-family: 'JetBrains Mono', monospace;
    display: none;
}

canvas {
    display: block;
}

#audio-element {
    display: none;
}

/* ── Record button ─────────────────────────────────────────────── */

/* `#hud #btn-record` beats the `#hud button { width: 36px }` rule above
   so REC can size to its label. */
#hud #btn-record {
    width: auto;
    padding: 0 12px;
    gap: 6px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    letter-spacing: 0.08em;
}

#btn-record .rec-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #e74c3c;
    box-shadow: 0 0 6px rgba(231, 76, 60, 0.6);
}

#btn-record .rec-label {
    color: var(--text-dim);
    transition: color 0.2s;
}

#btn-record:hover .rec-label {
    color: var(--text);
}

#btn-record.recording {
    border-color: #e74c3c;
    background: rgba(231, 76, 60, 0.12);
}

#btn-record.recording .rec-dot {
    animation: rec-pulse 1.2s ease-in-out infinite;
}

#btn-record.recording .rec-label {
    color: #e74c3c;
}

#btn-record.processing {
    opacity: 0.5;
    pointer-events: none;
}

@keyframes rec-pulse {
    0%, 100% { opacity: 1;   transform: scale(1); }
    50%      { opacity: 0.4; transform: scale(0.85); }
}

/* ── Settings panel ────────────────────────────────────────────── */

#settings-panel {
    position: fixed;
    bottom: 80px;
    right: 20px;
    z-index: 60;
    background: rgba(15, 17, 21, 0.92);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 16px 18px;
    min-width: 260px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    color: var(--text);
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
}

#settings-panel.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

#settings-panel .settings-title {
    color: var(--text);
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    font-size: 0.65rem;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
}

#settings-panel .settings-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 10px;
}

#settings-panel .settings-row label {
    color: var(--text-dim);
    font-size: 0.7rem;
}

.seg-control {
    display: inline-flex;
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
}

.seg-control button {
    background: none;
    border: none;
    color: var(--text-dim);
    padding: 6px 12px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.65rem;
    letter-spacing: 0.04em;
    transition: all 0.15s;
}

.seg-control button:hover {
    color: var(--text);
}

.seg-control button.active {
    background: var(--accent-dim);
    color: var(--accent);
}

.settings-hint,
.settings-note {
    color: var(--text-dim);
    font-size: 0.65rem;
    line-height: 1.5;
    margin-top: 8px;
}

.settings-note {
    padding-top: 10px;
    border-top: 1px solid var(--border);
}

.settings-hint strong,
.settings-note strong {
    color: var(--accent);
    font-weight: 400;
}

/* ── Encoding overlay ──────────────────────────────────────────── */

#record-overlay {
    position: fixed;
    inset: 0;
    z-index: 150;
    background: rgba(7, 8, 10, 0.75);
    backdrop-filter: blur(6px);
    display: none;
    align-items: center;
    justify-content: center;
}

#record-overlay.visible {
    display: flex;
}

.record-overlay-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 28px 32px;
    min-width: 320px;
    text-align: center;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.record-overlay-title {
    color: var(--text);
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.record-overlay-bar {
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 12px;
}

.record-overlay-fill {
    height: 100%;
    width: 0%;
    background: var(--accent);
    box-shadow: 0 0 8px var(--glow);
    transition: width 0.2s ease;
}

.record-overlay-sub {
    color: var(--text-dim);
    font-size: 0.7rem;
    font-family: 'JetBrains Mono', monospace;
}