:root {
    --bg: #0b1020;
    --bg-elev: #151a2c;
    --bg-elev-2: #1d2440;
    --border: #2d3748;
    --text: #edf2f7;
    --muted: #a0aec0;
    --accent: #4fd1c5;
    --accent-2: #63b3ed;
    --danger: #f56565;
    --warn: #f6ad55;
    --success: #68d391;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    --radius: 14px;
    --radius-pill: 999px;
    --tap: 56px;
    --safe-top: env(safe-area-inset-top, 0px);
    --safe-bottom: env(safe-area-inset-bottom, 0px);
    --safe-left: env(safe-area-inset-left, 0px);
    --safe-right: env(safe-area-inset-right, 0px);
}

[data-theme='light'] {
    --bg: #f4f6fb;
    --bg-elev: #ffffff;
    --bg-elev-2: #eef1f8;
    --border: #d8dee9;
    --text: #1a202c;
    --muted: #4a5568;
    --shadow: 0 6px 18px rgba(20, 30, 60, 0.1);
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    height: 100%;
}

body {
    background: radial-gradient(circle at top, #1a2540 0, #050814 55%, #020309 100%);
    color: var(--text);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    -webkit-tap-highlight-color: transparent;
    overscroll-behavior-y: contain;
    display: flex;
    flex-direction: column;
}

[data-theme='light'] body {
    background: linear-gradient(180deg, #f7f9fd 0%, #e6ebf5 100%);
}

/* ── Header ─────────────────────────────────────────────────────── */
.app-header {
    position: sticky;
    top: 0;
    z-index: 10;
    padding: calc(var(--safe-top) + 14px) calc(var(--safe-right) + 16px) 12px calc(var(--safe-left) + 16px);
    background: linear-gradient(180deg, rgba(10, 15, 30, 0.95), rgba(10, 15, 30, 0.7));
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
}

[data-theme='light'] .app-header {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.95), rgba(247, 249, 253, 0.7));
}

.title-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

.title-row h1 {
    margin: 0;
    font-size: clamp(20px, 4vw, 26px);
    letter-spacing: 0.02em;
    flex: 1;
}

.header-actions {
    display: flex;
    gap: 8px;
}

.controls {
    margin-top: 10px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

#search-input {
    width: 100%;
    min-height: var(--tap);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--bg-elev);
    color: var(--text);
    padding: 0 18px;
    font-size: 16px;
    /* prevents iOS zoom on focus */
    outline: none;
    transition: border-color 0.15s ease;
}

#search-input:focus {
    border-color: var(--accent);
}

/* ── Volume row ─────────────────────────────────────────────────── */
.volume-row {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 4px 6px;
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    min-height: var(--tap);
}

.mute-btn {
    flex: 0 0 auto;
    border: none;
    background: transparent;
    font-size: 22px;
    line-height: 1;
    padding: 0 8px;
    min-width: 44px;
    min-height: 44px;
    cursor: pointer;
    color: var(--text);
    border-radius: 10px;
    transition: background 0.15s ease, transform 0.05s ease;
}

.mute-btn:hover {
    background: var(--bg-elev-2);
}

.mute-btn:active {
    transform: scale(0.94);
}

.mute-btn[aria-pressed='true'] {
    color: var(--danger);
}

#volume-slider {
    flex: 1;
    height: 32px;
    background: transparent;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
    margin: 0;
    /* Linear gradient is updated from JS to show the filled portion. */
    --vol-pct: 80%;
}

#volume-slider::-webkit-slider-runnable-track {
    height: 6px;
    border-radius: 999px;
    background: linear-gradient(to right,
            var(--accent) 0,
            var(--accent) var(--vol-pct),
            var(--border) var(--vol-pct),
            var(--border) 100%);
}

#volume-slider::-moz-range-track {
    height: 6px;
    border-radius: 999px;
    background: var(--border);
}

#volume-slider::-moz-range-progress {
    height: 6px;
    border-radius: 999px;
    background: var(--accent);
}

#volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--accent);
    border: 3px solid var(--bg-elev);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
    margin-top: -8px;
    cursor: pointer;
    transition: transform 0.08s ease;
}

#volume-slider::-webkit-slider-thumb:active {
    transform: scale(1.15);
}

#volume-slider::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--accent);
    border: 3px solid var(--bg-elev);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
    cursor: pointer;
}

#volume-slider:focus {
    outline: none;
}

#volume-slider:focus-visible::-webkit-slider-thumb {
    box-shadow: 0 0 0 3px rgba(79, 209, 197, 0.4);
}

/* Muted state — show track in muted color */
.volume-row.is-muted #volume-slider::-webkit-slider-runnable-track {
    background: linear-gradient(to right,
            var(--muted) 0,
            var(--muted) var(--vol-pct),
            var(--border) var(--vol-pct),
            var(--border) 100%);
}

.volume-row.is-muted #volume-slider::-webkit-slider-thumb {
    background: var(--muted);
}

.volume-row.is-muted #volume-slider::-moz-range-progress,
.volume-row.is-muted #volume-slider::-moz-range-thumb {
    background: var(--muted);
}

.volume-value {
    flex: 0 0 auto;
    min-width: 44px;
    text-align: right;
    font-variant-numeric: tabular-nums;
    font-size: 13px;
    color: var(--muted);
}

.group-chips {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    scrollbar-width: thin;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 4px;
}

.group-chips::-webkit-scrollbar {
    height: 6px;
}

.group-chips::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

.chip {
    flex: 0 0 auto;
    min-height: 40px;
    padding: 0 14px;
    border-radius: var(--radius-pill);
    border: 1px solid var(--border);
    background: var(--bg-elev);
    color: var(--muted);
    font-size: 13px;
    letter-spacing: 0.04em;
    cursor: pointer;
    user-select: none;
    transition: all 0.15s ease;
}

.chip:hover {
    color: var(--text);
}

.chip[aria-pressed='true'] {
    background: var(--accent);
    color: #0b1020;
    border-color: var(--accent);
    font-weight: 600;
}

/* ── Buttons ────────────────────────────────────────────────────── */
.btn {
    min-height: var(--tap);
    min-width: var(--tap);
    padding: 0 16px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--bg-elev);
    color: var(--text);
    font-size: 15px;
    cursor: pointer;
    user-select: none;
    transition: transform 0.05s ease, background 0.15s ease, border-color 0.15s ease;
}

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

.btn-danger {
    background: rgba(245, 101, 101, 0.15);
    border-color: rgba(245, 101, 101, 0.5);
    color: var(--danger);
}

.btn-danger:hover {
    background: rgba(245, 101, 101, 0.25);
}

.btn-ghost {
    padding: 0 12px;
    font-size: 18px;
}

/* ── Board ──────────────────────────────────────────────────────── */
.board {
    flex: 1;
    padding: 16px calc(var(--safe-right) + 16px) calc(var(--safe-bottom) + 80px) calc(var(--safe-left) + 16px);
    display: flex;
    flex-direction: column;
    gap: 22px;
    overflow-y: auto;
}

.group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.group-title {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.16em;
    color: var(--muted);
    margin: 0 4px 0 4px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.group-title .count {
    font-weight: 400;
    color: var(--muted);
    opacity: 0.7;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 10px;
}

.sound-btn {
    position: relative;
    min-height: 84px;
    padding: 14px 12px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: linear-gradient(145deg, var(--bg-elev), var(--bg-elev-2));
    color: var(--text);
    font-size: 14px;
    line-height: 1.25;
    text-align: center;
    cursor: pointer;
    user-select: none;
    box-shadow: var(--shadow);
    transition: transform 0.06s ease, border-color 0.15s ease, background 0.2s ease;
    overflow: hidden;
    word-break: break-word;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
}

.sound-btn .sound-sub {
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--accent);
    opacity: 0.85;
    font-weight: 600;
    line-height: 1;
    word-break: break-word;
}

.sound-btn .sound-label {
    font-size: inherit;
    font-weight: 500;
    line-height: 1.25;
}

.sound-btn:hover {
    border-color: var(--accent);
}

.sound-btn:active {
    transform: scale(0.96);
}

.sound-btn.playing {
    border-color: var(--accent);
    background: linear-gradient(145deg, rgba(79, 209, 197, 0.25), rgba(99, 179, 237, 0.15));
}

.sound-btn.playing::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    animation: pulse 1.2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 0.6;
    }

    50% {
        opacity: 1;
    }
}

/* Larger screens — bigger buttons */
@media (min-width: 768px) {
    .grid {
        grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
        gap: 14px;
    }

    .sound-btn {
        min-height: 100px;
        font-size: 15px;
    }
}

@media (min-width: 1200px) {
    .grid {
        grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
    }
}

/* ── Empty state ────────────────────────────────────────────────── */
.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--muted);
    max-width: 600px;
    margin: 40px auto;
    background: var(--bg-elev);
    border: 1px dashed var(--border);
    border-radius: var(--radius);
}

.empty-state h2 {
    color: var(--text);
    margin-top: 0;
}

.empty-state code,
.empty-state pre {
    background: var(--bg-elev-2);
    color: var(--accent);
    padding: 2px 6px;
    border-radius: 6px;
    font-family: 'JetBrains Mono', ui-monospace, Menlo, monospace;
    font-size: 13px;
}

.empty-state pre {
    padding: 12px 16px;
    text-align: left;
    overflow-x: auto;
}

.hidden {
    display: none !important;
}

/* ── Footer ─────────────────────────────────────────────────────── */
.app-footer {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 8px calc(var(--safe-right) + 16px) calc(var(--safe-bottom) + 8px) calc(var(--safe-left) + 16px);
    background: rgba(10, 15, 30, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--muted);
    z-index: 10;
}

[data-theme='light'] .app-footer {
    background: rgba(255, 255, 255, 0.9);
}

.app-footer .spacer {
    flex: 1;
}