:root {
    --bg: #0e1014;
    --panel: #1a1d24;
    --panel-2: #14171d;
    --fg: #e6e8ec;
    --muted: #8a91a0;
    --accent: #5b9dff;
    --accent-active: #2d6fdb;
    --border: #2a2e38;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
}

body {
    font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
    background: var(--bg);
    color: var(--fg);
    min-height: 100vh;
    line-height: 1.4;
    overflow-x: clip;
}

main {
    max-width: 720px;
    margin: 0 auto;
    padding: 1.5rem 1rem 3rem;
}

header h1 {
    margin: 0 0 0.25rem 0;
    font-size: 1.4rem;
    font-weight: 600;
}

.subtitle {
    margin: 0 0 1rem 0;
    color: var(--muted);
    font-size: 0.85rem;
}

.canvas-wrap {
    position: relative;
}

.canvas-wrap canvas {
    display: block;
    width: 100%;
    background: #000;
    border-radius: 8px;
    border: 1px solid var(--border);
}

.canvas-wrap.single-mode canvas {
    aspect-ratio: 1 / 1;
}

.canvas-wrap.multi-mode {
    position: relative;
    left: calc(-50vw + 50%);
    width: 100vw;
}

.canvas-wrap.multi-mode canvas {
    aspect-ratio: 4 / 1;
    min-height: 200px;
    border-radius: 0;
    border-left: none;
    border-right: none;
}

.canvas-wrap.single-mode #strobeLabels {
    display: none;
}

#strobeLabels {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.strobe-label {
    position: absolute;
    transform: translateX(-50%);
    font-family: ui-monospace, "SF Mono", Menlo, monospace;
    font-size: 0.72rem;
    line-height: 1;
    color: var(--fg);
    text-align: center;
    white-space: nowrap;
    display: flex;
    gap: 0.35em;
    align-items: baseline;
}

.strobe-label .note {
    font-weight: 600;
    color: var(--accent);
}

.strobe-label .freq {
    color: var(--muted);
}

.strobe-label .freq2 {
    color: #4a5060;
}

.readout {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 0.5rem;
    margin: 1rem 0;
    background: var(--panel);
    padding: 0.75rem 1rem;
    border-radius: 6px;
    border: 1px solid var(--border);
    font-family: ui-monospace, "SF Mono", Menlo, monospace;
    font-size: 0.9rem;
}

.readout > div {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    min-width: 0;
}

.readout .label {
    color: var(--muted);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.readout strong {
    color: var(--accent);
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.slider {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.slider-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
}

.slider-row > span:last-child {
    font-family: ui-monospace, monospace;
    color: var(--accent);
}

.rate-input-wrap {
    display: inline-flex;
    align-items: baseline;
    gap: 0.3rem;
    color: var(--muted);
    font-size: 0.8rem;
}

.rate-input-wrap input {
    width: 8ch;
    background: var(--panel-2);
    color: var(--accent);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.15rem 0.35rem;
    font-family: ui-monospace, monospace;
    font-size: 0.85rem;
    text-align: right;
    -moz-appearance: textfield;
}

.rate-input-wrap input::-webkit-outer-spin-button,
.rate-input-wrap input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.slider input[type="range"] {
    width: 100%;
    accent-color: var(--accent);
}

.note-buttons {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 3px;
}

.note-buttons button {
    padding: 0.55rem 0;
    background: var(--panel);
    color: var(--fg);
    border: 1px solid var(--border);
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
    font-family: inherit;
    font-weight: 500;
    transition: background 0.1s;
}

.note-buttons button:hover {
    background: #232730;
}

.note-buttons button.sharp {
    background: var(--panel-2);
    color: var(--muted);
}

.note-buttons button.sharp:hover {
    background: #1c1f26;
}

.note-buttons button.active {
    background: var(--accent-active);
    color: #fff;
    border-color: var(--accent);
}

.row {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    font-size: 0.9rem;
}

.row > .label {
    color: var(--muted);
    font-size: 0.85rem;
}

.btn-group {
    display: flex;
    gap: 4px;
}

.btn-group button {
    padding: 0.4rem 0.85rem;
    background: var(--panel);
    color: var(--fg);
    border: 1px solid var(--border);
    border-radius: 4px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.85rem;
}

.btn-group button:hover {
    background: #232730;
}

.btn-group button.active {
    background: var(--accent-active);
    color: #fff;
    border-color: var(--accent);
}

label {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--muted);
}

label.grow {
    flex: 1;
    color: var(--fg);
}

label.grow select {
    flex: 1;
}

label.checkbox {
    cursor: pointer;
    color: var(--fg);
}

label.checkbox input {
    accent-color: var(--accent);
}

select {
    background: var(--panel);
    color: var(--fg);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.3rem 0.5rem;
    font-family: inherit;
    font-size: 0.85rem;
    cursor: pointer;
}

.advanced-panel {
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--panel-2);
}

.advanced-panel > summary {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 0.85rem;
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--muted);
    user-select: none;
}

.advanced-panel > summary::before {
    content: '▶';
    font-size: 0.6rem;
    transition: transform 0.15s;
    color: var(--muted);
}

.advanced-panel[open] > summary::before {
    transform: rotate(90deg);
}

.advanced-panel > summary:hover {
    color: var(--fg);
}

.advanced-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 0.75rem 0.85rem 0.85rem;
    border-top: 1px solid var(--border);
}

.audio-sync-warning {
    background: #2a1800;
    border: 1px solid #7a4000;
    border-radius: 6px;
    color: #ffaa44;
    font-size: 0.82rem;
    padding: 0.6rem 0.85rem;
    margin-bottom: 1rem;
}

.consent-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    padding: 2rem;
}

.consent-panel {
    max-width: 420px;
    width: 100%;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.consent-panel h2 {
    margin: 0;
    font-size: 1.6rem;
    font-weight: 600;
}

.consent-subtitle {
    margin: 0;
    color: var(--muted);
    font-size: 0.9rem;
}

.consent-btn {
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 0.9rem 2.75rem;
    font-size: 1.1rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: background 0.15s, transform 0.1s;
    letter-spacing: 0.01em;
}

.consent-btn:hover {
    background: var(--accent-active);
}

.consent-btn:active {
    transform: scale(0.97);
}

.consent-warning {
    margin: 0;
    color: #ffbb55;
    background: #2a1500;
    border: 1px solid #7a4a00;
    border-radius: 6px;
    font-size: 0.82rem;
    padding: 0.75rem 1rem;
    line-height: 1.55;
    text-align: left;
}

.consent-warning strong {
    color: #ffcc77;
}

footer {
    margin-top: 1.5rem;
    color: var(--muted);
    font-size: 0.8rem;
    line-height: 1.55;
}

footer a {
    color: var(--accent);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}