:root {
    color-scheme: dark;
    --bg: #101418;
    --surface: #1c2128;
    --surface-active: #2a323d;
    --text: #f4f6f8;
    --muted: #8a93a0;
    --accent: #4cc9f0;
    --danger: #f25f5c;
    --good: #6ecf68;
    --radius: 12px;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font: 16px/1.4 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    min-height: 100vh;
}

main {
    max-width: 720px;
    margin: 0 auto;
    padding: 24px 16px 48px;
    padding-bottom: calc(48px + env(safe-area-inset-bottom));
    display: flex;
    flex-direction: column;
    gap: 24px;
}

header h1 {
    margin: 0 0 4px;
    font-size: 22px;
    font-weight: 600;
    line-height: 1.2;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.muted { color: var(--muted); margin: 0; font-size: 14px; }

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 12px;
}

.tile {
    appearance: none;
    background: var(--surface);
    color: var(--text);
    border: 0;
    border-radius: var(--radius);
    padding: 18px 14px;
    min-height: 88px;
    text-align: left;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 8px;
    transition: background 80ms ease, transform 80ms ease;
}

.tile:active { transform: scale(0.97); background: var(--surface-active); }
.tile.current { outline: 2px solid var(--accent); }

.tile .badge {
    color: var(--muted);
    font-size: 12px;
    font-weight: 400;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.transport, .volume {
    display: flex;
    gap: 12px;
    align-items: center;
    justify-content: center;
}

.transport button, .volume button {
    appearance: none;
    background: var(--surface);
    color: var(--text);
    border: 0;
    border-radius: var(--radius);
    font-size: 24px;
    min-width: 64px;
    min-height: 64px;
    padding: 0 12px;
    cursor: pointer;
}

.transport button:active, .volume button:active {
    background: var(--surface-active);
}

.transport button.primary {
    background: var(--accent);
    color: #04212d;
    min-width: 96px;
    font-weight: 700;
}

#volume-readout {
    min-width: 64px;
    text-align: center;
    font-size: 22px;
    font-variant-numeric: tabular-nums;
}

footer {
    display: flex;
    align-items: center;
    gap: 12px;
    justify-content: center;
    color: var(--muted);
    font-size: 14px;
}

#refresh {
    appearance: none;
    background: transparent;
    color: var(--muted);
    border: 1px solid var(--surface-active);
    border-radius: var(--radius);
    padding: 10px 14px;
    cursor: pointer;
}

#refresh:active { background: var(--surface); }

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--muted);
}

.dot.up { background: var(--good); }
.dot.down { background: var(--danger); }

button[disabled] { opacity: 0.5; pointer-events: none; }