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

:root {
  --bg: #0a0a0f;
  --card: #13131a;
  --card-border: #1e1e2a;
  --accent: #00d4b8;
  --accent-dim: rgba(0, 212, 184, 0.15);
  --accent-glow: rgba(0, 212, 184, 0.35);
  --text: #e2e2ee;
  --text-muted: #5a5a72;
  --text-mid: #9898b4;
  --danger: #ff5568;
  --radius: 12px;
  --radius-sm: 8px;
}

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0 16px 40px;
  min-height: 100dvh;
}

/* ── Header ── */
.app-header {
  width: 100%;
  max-width: 480px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 28px 0 20px;
}

.app-icon {
  width: 36px;
  height: 36px;
  background: var(--accent);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.app-icon svg {
  width: 20px;
  height: 20px;
  fill: var(--bg);
}

.app-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.app-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 1px;
}

/* ── Main layout ── */
.main {
  width: 100%;
  max-width: 480px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* ── Cards ── */
.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 18px;
}

/* ── Preset pills ── */
.preset-group {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.preset-btn {
  background: transparent;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  color: var(--text-mid);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 10px 8px 8px;
  cursor: pointer;
  transition: all 0.15s ease;
  text-align: center;
  line-height: 1.2;
}

.preset-btn .preset-desc {
  display: block;
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 2px;
  font-weight: 400;
}

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

.preset-btn.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}

.preset-btn.active .preset-desc {
  color: rgba(0, 212, 184, 0.6);
}

/* ── Play controls ── */
.play-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.play-btn {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  border: 2px solid var(--card-border);
  background: var(--card);
  color: var(--text);
  font-size: 1.5rem;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.play-btn::before {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px solid transparent;
  transition: border-color 0.2s ease;
}

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

.play-btn.playing {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

.play-btn.playing::before {
  border-color: var(--accent-glow);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.15); opacity: 0; }
}

/* ── Visualizer ── */
.visualizer-wrap {
  width: 100%;
}

#visualizer {
  width: 100%;
  height: 60px;
  display: block;
}

/* ── Section labels ── */
.section-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 12px;
}

/* ── Details / accordion ── */
details.card {
  padding: 0;
  overflow: hidden;
}

details summary {
  padding: 18px;
  cursor: pointer;
  user-select: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
  list-style: none;
}

details summary::-webkit-details-marker { display: none; }

details summary::after {
  content: '›';
  font-size: 1.2rem;
  color: var(--text-muted);
  transition: transform 0.2s ease;
  transform: rotate(90deg);
}

details[open] summary::after {
  transform: rotate(270deg);
}

.details-body {
  padding: 0 18px 18px;
  border-top: 1px solid var(--card-border);
}

/* ── Sliders ── */
.slider-group {
  margin-bottom: 16px;
}

.group-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 10px;
  padding-top: 4px;
}

.slider-row {
  display: grid;
  grid-template-columns: 64px 1fr 52px;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.slider-row:last-child { margin-bottom: 0; }

.slider-label {
  font-size: 0.8125rem;
  color: var(--text-mid);
  font-weight: 500;
}

.slider-row output {
  font-size: 0.75rem;
  color: var(--accent);
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-weight: 500;
}

/* Range input styling */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: var(--card-border);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
  cursor: pointer;
  transition: box-shadow 0.15s ease;
}

input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: none;
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
  cursor: pointer;
  transition: box-shadow 0.15s ease;
}

input[type="range"]:focus::-webkit-slider-thumb,
input[type="range"]:hover::-webkit-slider-thumb {
  box-shadow: 0 0 0 5px var(--accent-glow);
}

input[type="range"]:focus::-moz-range-thumb,
input[type="range"]:hover::-moz-range-thumb {
  box-shadow: 0 0 0 5px var(--accent-glow);
}

/* ── Save button ── */
.save-btn {
  width: 100%;
  margin-top: 16px;
  padding: 10px;
  background: transparent;
  border: 1px dashed var(--card-border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.save-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

/* ── Dialog ── */
dialog {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 24px;
  color: var(--text);
  max-width: 320px;
  width: calc(100% - 32px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
  /* Center in viewport */
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  margin: 0;
}

dialog::backdrop {
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
}

dialog h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 14px;
}

dialog input[type="text"] {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.9375rem;
  padding: 10px 12px;
  outline: none;
  transition: border-color 0.15s ease;
  margin-bottom: 16px;
}

dialog input[type="text"]:focus {
  border-color: var(--accent);
}

.dialog-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

.btn-primary {
  padding: 8px 18px;
  background: var(--accent);
  color: var(--bg);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s ease;
}

.btn-primary:hover { opacity: 0.85; }

.btn-ghost {
  padding: 8px 18px;
  background: transparent;
  color: var(--text-mid);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-ghost:hover {
  color: var(--text);
  border-color: var(--text-mid);
}

/* ── Saved presets ── */

.saved-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 4px;
}

.saved-item {
  display: flex;
  gap: 6px;
  align-items: center;
}

.saved-play-btn {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 9px 12px;
  text-align: left;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.15s ease;
  overflow: hidden;
}

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

.saved-name {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.saved-delete-btn {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
  background: transparent;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.15s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.saved-delete-btn:hover {
  border-color: var(--danger);
  color: var(--danger);
  background: rgba(255, 85, 104, 0.1);
}

/* ── Install button ── */
#install-btn {
  width: 100%;
  max-width: 480px;
  margin-top: 8px;
  padding: 12px;
  background: var(--accent-dim);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  color: var(--accent);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

#install-btn:hover {
  background: rgba(0, 212, 184, 0.25);
}


/* ── Share button ── */
.app-header {
  justify-content: flex-start;
}

.share-btn {
  margin-left: auto;
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  background: transparent;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
}

.share-btn svg {
  width: 18px;
  height: 18px;
}

.share-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

/* ── Share toast ── */
.share-toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(12px);
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.875rem;
  padding: 10px 18px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease, transform 0.2s ease;
  white-space: nowrap;
  z-index: 100;
}

.share-toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ── Utility ── */
.hidden { display: none !important; }

/* ── Divider ── */
.divider {
  height: 1px;
  background: var(--card-border);
  margin: 4px 0;
}