/* ── Design tokens ──────────────────────────────────────────── */
:root {
  --bg:        #0f1117;
  --surface:   #1a1d27;
  --surface2:  #252836;
  --border:    #333650;
  --accent:    #7c6af7;
  --accent-glow: rgba(124, 106, 247, 0.35);
  --accent-hover: #9b8dfa;
  --text:      #e8e9f0;
  --text-muted:#9496a8;
  --warning-bg:#2b2210;
  --warning-border:#a07c2a;
  --warning-text:#f0c060;
  --error-bg:  #2b1010;
  --error-text:#f06060;
  --radius:    12px;
  --radius-sm: 8px;
  --transition: 0.2s ease;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
}

/* ── Card ───────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.5rem 2.5rem 2rem;
  width: 100%;
  max-width: 620px;
  box-shadow: 0 8px 40px rgba(0,0,0,0.5);
}

/* ── Header ─────────────────────────────────────────────────── */
header {
  margin-bottom: 1.75rem;
  text-align: center;
}
header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--accent-hover) 0%, #b8aafb 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.4rem;
}
header p.subtitle {
  color: var(--text-muted);
  font-size: 0.92rem;
}

/* ── Warning banner ─────────────────────────────────────────── */
.warning-banner {
  background: var(--warning-bg);
  border: 1px solid var(--warning-border);
  border-radius: var(--radius-sm);
  padding: 0.65rem 1rem;
  font-size: 0.85rem;
  color: var(--warning-text);
  margin-bottom: 1.75rem;
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  line-height: 1.5;
}
.warning-banner .icon { flex-shrink: 0; font-size: 1rem; }

/* ── Form ───────────────────────────────────────────────────── */
label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.5rem;
}

textarea#text-input {
  width: 100%;
  min-height: 120px;
  resize: vertical;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 1rem;
  line-height: 1.6;
  padding: 0.75rem 1rem;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  font-family: inherit;
}
textarea#text-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
textarea#text-input::placeholder { color: var(--text-muted); }

.char-count {
  text-align: right;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.3rem;
  margin-bottom: 1.25rem;
  transition: color var(--transition);
}
.char-count.over { color: var(--error-text); }

/* ── Button ─────────────────────────────────────────────────── */
button#synth-btn {
  width: 100%;
  padding: 0.85rem;
  background: var(--accent);
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  letter-spacing: 0.02em;
  transition: background var(--transition), box-shadow var(--transition), transform 0.1s ease;
}
button#synth-btn:hover:not(:disabled) {
  background: var(--accent-hover);
  box-shadow: 0 4px 20px var(--accent-glow);
}
button#synth-btn:active:not(:disabled) { transform: scale(0.98); }
button#synth-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* ── Status / spinner ───────────────────────────────────────── */
#status {
  min-height: 1.4rem;
  font-size: 0.88rem;
  text-align: center;
  margin-top: 1rem;
  color: var(--text-muted);
}
#status.error { color: var(--error-text); }

.spinner {
  display: inline-block;
  width: 0.9em;
  height: 0.9em;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  vertical-align: middle;
  animation: spin 0.7s linear infinite;
  margin-right: 0.4em;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Audio player ───────────────────────────────────────────── */
#audio-section {
  margin-top: 1.5rem;
  display: none;
}
#audio-section label { margin-bottom: 0.6rem; }

audio#player {
  width: 100%;
  height: 40px;
  border-radius: var(--radius-sm);
  accent-color: var(--accent);
}
/* Tint audio control background */
audio#player::-webkit-media-controls-panel { background: var(--surface2); }

.download-link {
  display: block;
  text-align: right;
  font-size: 0.8rem;
  color: var(--accent-hover);
  text-decoration: none;
  margin-top: 0.4rem;
}
.download-link:hover { text-decoration: underline; }

/* ── Footer ─────────────────────────────────────────────────── */
footer {
  margin-top: 2rem;
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-muted);
}
footer a { color: var(--text-muted); text-decoration: underline; }
footer a:hover { color: var(--text); }


/* ══════════════════════════════════════════════════════════════
   NEW COMPONENTS — same visual language as above
   ══════════════════════════════════════════════════════════════ */

/* ── Quality mode selector (A) ──────────────────────────────── */
.quality-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.75rem;
}

.quality-row label {
  margin-bottom: 0;          /* override the block-label default */
  white-space: nowrap;
  flex-shrink: 0;
}

select#quality-select {
  flex: 1;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.9rem;
  font-family: inherit;
  padding: 0.45rem 0.75rem;
  outline: none;
  cursor: pointer;
  transition: border-color var(--transition), box-shadow var(--transition);
  /* Remove default system arrow on some browsers for a cleaner look */
  appearance: auto;
}
select#quality-select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
/* Dark option list (Chromium honours this) */
select#quality-select option {
  background: var(--surface2);
  color: var(--text);
}

/* ── Example prompt chips (B) ───────────────────────────────── */
.chips-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.6rem;
}

.chip {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 999px;         /* pill shape */
  color: var(--text-muted);
  font-size: 0.78rem;
  font-family: inherit;
  padding: 0.25rem 0.7rem;
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
  line-height: 1.4;
}
.chip:hover {
  color: var(--accent-hover);
  border-color: var(--accent);
  background: var(--surface);
}
.chip:active {
  transform: scale(0.96);
}

/* ── Debug info accordion (C) ───────────────────────────────── */
#debug-section {
  margin-top: 1rem;
  display: none;              /* shown by render() after first success */
}

#debug-section summary {
  font-size: 0.82rem;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
  list-style: none;           /* hide default triangle in Firefox */
  display: flex;
  align-items: center;
  gap: 0.35rem;
}
#debug-section summary::-webkit-details-marker { display: none; }
#debug-section summary::before {
  content: '▶';
  font-size: 0.65rem;
  display: inline-block;
  transition: transform var(--transition);
}
#debug-section[open] summary::before {
  transform: rotate(90deg);
}

.debug-body {
  margin-top: 0.6rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.35rem 0.75rem;
  align-items: start;
}
.debug-body dt {
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
}
.debug-body dd { margin: 0; word-break: break-all; }
.debug-body code {
  display: block;
  font-family: 'Consolas', 'Menlo', monospace;
  font-size: 0.82rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.35rem 0.6rem;
  white-space: pre-wrap;
  word-break: break-all;
  color: var(--text);
  margin-top: 0.15rem;
}

/* ── Generation history (D) ─────────────────────────────────── */
#history-section {
  margin-top: 2rem;
  display: none;              /* shown by render() once history has entries */
}

#history-section h2 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.75rem;
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.history-entry {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.8rem;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.35rem 0.6rem;
  align-items: start;
}

.history-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.history-text {
  font-size: 0.88rem;
  color: var(--text);
  word-break: break-all;
  grid-column: 1;
}

.history-audio {
  grid-column: 1 / -1;
  margin-top: 0.35rem;
}

.history-audio audio {
  width: 100%;
  height: 34px;
  border-radius: var(--radius-sm);
  accent-color: var(--accent);
}
.history-audio audio::-webkit-media-controls-panel { background: var(--surface); }

.quality-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.1rem 0.45rem;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--accent-hover);
  white-space: nowrap;
}

.latency-badge {
  font-size: 0.72rem;
  color: var(--text-muted);
  white-space: nowrap;
}

/* Remove button for history entries */
.history-remove {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
  padding: 0.1rem 0.2rem;
  border-radius: 4px;
  transition: color var(--transition);
  grid-row: 1;
  grid-column: 2;
  align-self: start;
}
.history-remove:hover { color: var(--error-text); }

/* Responsive: on narrow screens ensure card padding doesn't overflow */
@media (max-width: 420px) {
  .card {
    padding: 1.5rem 1.25rem 1.25rem;
  }
  .quality-row {
    flex-direction: column;
    align-items: flex-start;
  }
  select#quality-select {
    width: 100%;
  }
}