src/index.css

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

:root {
  --bg: #111;
  --surface: #1a1a1a;
  --surface-2: #222;
  --border: #333;
  --text: #e5e5e5;
  --text-muted: #888;
  --accent: #c084fc;
  --accent-dim: rgba(192, 132, 252, 0.15);
  --radius: 8px;
  --font: system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, "SF Mono", Consolas, monospace;
}

html {
  color-scheme: dark;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */

header {
  text-align: center;
  margin-bottom: 2rem;
  position: relative;
}

header h1 {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 0.25rem;
}

.title-link {
  color: var(--text) !important;
  text-decoration: none !important;
}

.title-link:hover {
  opacity: 0.8;
}

.logo {
  font-size: 1.5rem;
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.badge {
  display: inline-block;
  margin-top: 0.5rem;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 600;
  font-family: var(--mono);
  letter-spacing: 0.05em;
}

.badge-gpu {
  background: rgba(74, 222, 128, 0.15);
  color: #4ade80;
  border: 1px solid rgba(74, 222, 128, 0.3);
}

.badge-wasm {
  background: rgba(251, 191, 36, 0.15);
  color: #fbbf24;
  border: 1px solid rgba(251, 191, 36, 0.3);
}

/* Main */

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

textarea {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.95rem;
  padding: 0.75rem;
  resize: vertical;
  outline: none;
  transition: border-color 0.15s;
}

textarea:focus {
  border-color: var(--accent);
}

textarea::placeholder {
  color: #555;
}

/* Controls */

.controls-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-top: 0.75rem;
}

select {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.9rem;
  padding: 0.5rem 0.75rem;
  outline: none;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%23888' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2rem;
}

select:focus {
  border-color: var(--accent);
}

select:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.speed-row {
  margin-top: 0.75rem;
}

.speed-row label {
  font-family: var(--mono);
  font-size: 0.75rem;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
  height: 4px;
  cursor: pointer;
}

/* Generate button */

.generate-btn {
  margin-top: 1rem;
  width: 100%;
  padding: 0.7rem 1.5rem;
  background: var(--accent);
  color: #111;
  border: none;
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s;
}

.generate-btn:hover:not(:disabled) {
  opacity: 0.9;
}

.generate-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Output */

.output-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
}

/* Waveform player */

.waveform-player {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.waveform-play {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: var(--accent);
  color: #111;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.15s;
}

.waveform-play:hover {
  opacity: 0.85;
}

.waveform-canvas {
  flex: 1;
  height: 48px;
  cursor: pointer;
  border-radius: 4px;
}

.waveform-time {
  flex-shrink: 0;
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  min-width: 5.5em;
  text-align: right;
}

.waveform-gen-time {
  flex-shrink: 0;
  font-family: var(--mono);
  font-size: 0.65rem;
  color: #555;
  padding: 0.15rem 0.4rem;
  background: var(--surface-2);
  border-radius: 4px;
}

.audio-placeholder {
  padding: 2rem 1rem;
  text-align: center;
  color: #555;
  font-size: 0.85rem;
}

/* Examples */

.examples-grid {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.example-btn {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.6rem 0.75rem;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.85rem;
  cursor: pointer;
  text-align: left;
  transition: border-color 0.15s;
}

.example-btn:hover:not(:disabled) {
  border-color: var(--accent);
}

.example-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.example-voice {
  flex-shrink: 0;
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  padding: 0.1rem 0.4rem;
  background: var(--accent-dim);
  border-radius: 4px;
}

.example-text {
  color: var(--text-muted);
  flex: 1;
}

.example-meta {
  flex-shrink: 0;
  font-family: var(--mono);
  font-size: 0.7rem;
  color: #555;
}

/* Error */

.error-msg {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #f87171;
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  font-size: 0.85rem;
}

/* Footer */

footer {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.footer-note {
  font-style: italic;
  margin-bottom: 0.5rem;
}

footer a {
  color: var(--text-muted);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color 0.15s;
}

footer a:hover {
  color: var(--text);
}

/* Responsive */

@media (max-width: 480px) {
  .container {
    padding: 1.25rem 1rem;
  }
  .controls-row {
    grid-template-columns: 1fr;
  }
  header h1 {
    font-size: 1.5rem;
  }
}