:root {
  /* ── GravityUI dark palette ── */
  --bg-deep:          #0d0d0f;
  --bg-surface:       rgba(20, 20, 23, 0.75);
  --bg-surface-solid: #141417;
  --bg-raised:        rgba(28, 28, 34, 0.65);
  --glass-border:     rgba(255, 255, 255, 0.07);

  --text-primary:    #ededed;
  --text-secondary:  #9494a8;
  --text-muted:      #52526a;

  --accent-morning:      #FFB020;
  --accent-morning-dim:  rgba(255, 176, 32, 0.13);
  --accent-morning-glow: rgba(255, 176, 32, 0.35);

  --accent-evening: #818CF8;

  --success:      #22c55e;
  --success-dim:  rgba(34, 197, 94, 0.12);
  --success-glow: rgba(34, 197, 94, 0.3);

  --voice-active:     #34D399;
  --voice-active-dim: rgba(52, 211, 153, 0.13);
  --voice-active-glow:rgba(52, 211, 153, 0.35);

  --danger:     #EF4444;
  --danger-dim: rgba(239, 68, 68, 0.13);

  /* ── GravityUI radius scale ── */
  --r-xs: 3px;
  --r-sm: 5px;
  --r-md: 8px;
  --r-lg: 10px;
  --r-xl: 14px;
  --r-2xl:18px;
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-deep);
  color: var(--text-primary);
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
}

.app-layout {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  background: radial-gradient(circle at top left, rgba(20, 20, 30, 0.4) 0%, transparent 40%),
              radial-gradient(circle at bottom right, rgba(20, 20, 30, 0.3) 0%, transparent 50%);
}

/* ── Header ── */
.app-header {
  height: 72px;
  background: var(--bg-surface-solid);
  border-bottom: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  z-index: 10;
  box-shadow: 0 4px 24px rgba(0,0,0,0.1);
  position: sticky;
  top: 0;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.back-btn {
  width: 34px;
  height: 34px;
  border-radius: var(--r-md);
  border: 1px solid var(--glass-border);
  background: var(--bg-raised);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.back-btn:hover {
  background: rgba(255,255,255,0.08);
  color: var(--text-primary);
}

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

.logo-mark {
  width: 36px;
  height: 36px;
  border-radius: var(--r-lg);
  background: linear-gradient(135deg, var(--accent-morning), var(--accent-evening));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
  color: #fff;
  text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.logo h1 {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.logo h1 span {
  color: var(--text-secondary);
  font-weight: 400;
}

.tts-status-pill {
  font-size: 11.5px;
  font-family: 'JetBrains Mono', monospace;
  padding: 6px 12px;
  border-radius: var(--r-md);
  background: var(--bg-raised);
  color: var(--text-secondary);
  border: 1px solid var(--glass-border);
}

.tts-status-pill.enabled {
  background: var(--voice-active-dim);
  color: var(--voice-active);
  border-color: rgba(52, 211, 153, 0.3);
}

.tts-status-pill.disabled {
  background: var(--danger-dim);
  color: var(--danger);
  border-color: rgba(239, 68, 68, 0.3);
}

/* ── Main Content ── */
.config-main {
  flex: 1;
  overflow-y: auto;
}

.config-scroll {
  max-width: 860px;
  margin: 0 auto;
  padding: 40px 40px 120px;
  display: flex;
  flex-direction: column;
  gap: 40px;
}

/* ── Warning Banner ── */
.warning-banner {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  border-radius: var(--r-lg);
  background: var(--danger-dim);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--danger);
  font-size: 14px;
  line-height: 1.5;
}

.warning-banner svg { flex-shrink: 0; }
.warning-banner code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  background: rgba(239, 68, 68, 0.15);
  padding: 1px 6px;
  border-radius: 4px;
}

/* ── Sections ── */
.config-section {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.section-header h2 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.section-header p {
  font-size: 13px;
  color: var(--text-muted);
}

/* ── Sample Text ── */
.sample-textarea {
  width: 100%;
  background: var(--bg-raised);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-xl);
  padding: 16px 20px;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 15px;
  line-height: 1.6;
  resize: vertical;
  min-height: 90px;
  outline: none;
  transition: border-color 0.2s;
}

.sample-textarea:focus {
  border-color: rgba(255,255,255,0.15);
}

.sample-textarea::placeholder { color: var(--text-muted); }

/* ── Controls Row ── */
.controls-row {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  flex-wrap: wrap;
}

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

.control-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.speed-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--accent-morning);
  text-transform: none;
  letter-spacing: 0;
}

/* ── Model Toggle ── */
.model-toggle {
  display: flex;
  background: var(--bg-raised);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-lg);
  padding: 3px;
  gap: 3px;
}

.model-btn {
  padding: 6px 16px;
  border-radius: var(--r-md);
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.model-btn:hover {
  color: var(--text-secondary);
  background: rgba(255,255,255,0.04);
}

.model-btn.active {
  background: var(--accent-morning-dim);
  color: var(--accent-morning);
  box-shadow: 0 0 12px var(--accent-morning-glow);
}

/* ── Speed Slider ── */
.speed-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 280px;
  height: 4px;
  border-radius: 2px;
  background: var(--glass-border);
  outline: none;
  cursor: pointer;
}

.speed-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent-morning);
  box-shadow: 0 0 10px var(--accent-morning-glow);
  cursor: pointer;
  transition: box-shadow 0.2s;
}

.speed-slider::-webkit-slider-thumb:hover {
  box-shadow: 0 0 16px var(--accent-morning-glow);
}

.speed-labels {
  display: flex;
  justify-content: space-between;
  width: 280px;
  font-size: 11px;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-muted);
  margin-top: -4px;
}

/* ── Voice Grid ── */
.voice-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
}

.voice-card {
  background: var(--bg-raised);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-xl);
  padding: 20px;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  gap: 12px;
  position: relative;
  animation: fadeIn 0.4s ease forwards;
  opacity: 0;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.voice-card:hover {
  border-color: rgba(255,255,255,0.12);
  background: rgba(26, 26, 35, 0.9);
  transform: translateY(-2px);
}

.voice-card.selected {
  border-color: var(--voice-active);
  background: var(--voice-active-dim);
  box-shadow: 0 0 20px rgba(52, 211, 153, 0.15);
}

.voice-card.selected .voice-name {
  color: var(--voice-active);
}

.voice-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.voice-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  text-transform: capitalize;
}

.voice-badge {
  font-size: 11px;
  font-family: 'JetBrains Mono', monospace;
  padding: 3px 8px;
  border-radius: 6px;
  border: 1px solid var(--glass-border);
  color: var(--text-muted);
  background: rgba(255,255,255,0.03);
}

.voice-card.selected .voice-badge {
  background: var(--voice-active-dim);
  border-color: rgba(52, 211, 153, 0.3);
  color: var(--voice-active);
}

.voice-description {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}

.voice-card-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 4px;
}

.selected-indicator {
  display: none;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  color: var(--voice-active);
  font-family: 'JetBrains Mono', monospace;
}

.voice-card.selected .selected-indicator {
  display: flex;
}

.play-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: rgba(255,255,255,0.04);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.play-btn:hover {
  background: rgba(255,255,255,0.1);
  color: var(--text-primary);
  border-color: rgba(255,255,255,0.15);
}

.play-btn.loading {
  border-color: var(--accent-morning);
  color: var(--accent-morning);
  animation: btnSpin 1.2s linear infinite;
}

.play-btn.playing {
  background: rgba(239, 68, 68, 0.15);
  border-color: rgba(239, 68, 68, 0.4);
  color: #EF4444;
}

@keyframes btnSpin {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ── Save Bar ── */
.save-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, var(--bg-deep) 60%, transparent);
  padding: 24px 40px 32px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 20px;
  z-index: 20;
}

.save-status {
  font-size: 13px;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-muted);
  transition: all 0.3s ease;
}

.save-status.success {
  color: var(--success);
}

.save-status.error {
  color: var(--danger);
}

.save-btn {
  padding: 10px 24px;
  border-radius: var(--r-lg);
  border: none;
  background: var(--voice-active);
  color: #000;
  font-family: inherit;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 4px 16px var(--voice-active-glow);
}

.save-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--voice-active-glow);
}

.save-btn:active {
  transform: translateY(0);
}

.save-btn:disabled {
  background: var(--bg-raised);
  color: var(--text-muted);
  box-shadow: none;
  cursor: not-allowed;
  transform: none;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .app-header { padding: 0 16px; height: 56px; }
  .logo h1 { font-size: 16px; }
  .logo-mark { width: 32px; height: 32px; font-size: 16px; border-radius: 10px; }

  .config-scroll { padding: 24px 16px 120px; gap: 32px; }

  .controls-row { flex-direction: column; gap: 20px; }
  .speed-slider, .speed-labels { width: 100%; }

  .voice-grid { grid-template-columns: 1fr; }

  .save-bar { padding: 16px 16px 24px; }
}