/* Default: light theme */
:root,
html[data-theme="light"] {
  --bg: #f4f6fb;
  --bg-accent-1: #dfe8ff;
  --bg-accent-2: #e4f5ec;
  --surface: #ffffff;
  --surface-2: #f0f3f8;
  --border: #d8dee9;
  --text: #1a1f2c;
  --muted: #5f6b7c;
  --accent: #3b6ef5;
  --accent-hover: #2f5ad4;
  --accent-soft: rgba(59, 110, 245, 0.14);
  --danger: #d64545;
  --success: #1f9d62;
  --shadow: 0 12px 36px rgba(24, 39, 75, 0.1);
  --primary-btn-text: #ffffff;
  --range-track: #d8dee9;
  --range-thumb: #3b6ef5;
  --chip-bg: #f0f3f8;
}

html[data-theme="dark"] {
  --bg: #0f1115;
  --bg-accent-1: #1b2440;
  --bg-accent-2: #1a2a22;
  --surface: #1a1d24;
  --surface-2: #242833;
  --border: #2e3340;
  --text: #e8eaed;
  --muted: #9aa0a6;
  --accent: #6c8cff;
  --accent-hover: #8aa4ff;
  --accent-soft: rgba(108, 140, 255, 0.2);
  --danger: #ff6b6b;
  --success: #3dd68c;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
  --primary-btn-text: #0b1020;
  --range-track: #2e3340;
  --range-thumb: #6c8cff;
  --chip-bg: #242833;
}

:root {
  --radius: 12px;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  color-scheme: light;
}

html[data-theme="dark"] {
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: radial-gradient(1200px 600px at 10% -10%, var(--bg-accent-1) 0%, transparent 50%),
    radial-gradient(900px 500px at 100% 0%, var(--bg-accent-2) 0%, transparent 45%), var(--bg);
  color: var(--text);
}

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 32px 16px 48px;
}

.hidden {
  display: none !important;
}

.topbar {
  width: 100%;
  max-width: 720px;
  display: flex;
  justify-content: flex-end;
  margin-bottom: 12px;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 14px;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 600;
  box-shadow: 0 4px 14px rgba(24, 39, 75, 0.06);
  cursor: pointer;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--text);
}

.card {
  width: 100%;
  max-width: 720px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 4px);
  box-shadow: var(--shadow);
  padding: 28px;
}

.card h1 {
  margin: 0 0 6px;
  font-size: 1.55rem;
  font-weight: 650;
  letter-spacing: -0.02em;
}

.subtitle {
  margin: 0 0 24px;
  color: var(--muted);
  font-size: 0.95rem;
}

.header-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 8px;
}

.user-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--chip-bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 12px;
  color: var(--muted);
  font-size: 0.85rem;
  white-space: nowrap;
}

label {
  display: block;
  margin: 0 0 6px;
  font-size: 0.85rem;
  color: var(--muted);
}

.field {
  margin-bottom: 16px;
}

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

input[type="text"],
input[type="password"],
select,
textarea {
  width: 100%;
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  font: inherit;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

textarea {
  min-height: 160px;
  resize: vertical;
  line-height: 1.45;
}

.speed-control {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
}

.speed-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.speed-header label {
  margin: 0;
}

.speed-value {
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 0.85rem;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 999px;
  background: var(--range-track);
  outline: none;
  margin: 4px 0 8px;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--range-thumb);
  border: 2px solid var(--surface);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
  cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--range-thumb);
  border: 2px solid var(--surface);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
  cursor: pointer;
}

.speed-labels {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 0.75rem;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 8px;
}

button,
.button-link {
  appearance: none;
  border: none;
  border-radius: 10px;
  padding: 11px 16px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  transition: background 0.15s ease, transform 0.05s ease, opacity 0.15s ease;
}

button:active {
  transform: translateY(1px);
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--accent);
  color: var(--primary-btn-text);
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

.btn-secondary {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
}

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

.btn-danger {
  background: transparent;
  color: var(--danger);
  border: 1px solid color-mix(in srgb, var(--danger) 35%, transparent);
}

.btn-danger:hover:not(:disabled) {
  background: color-mix(in srgb, var(--danger) 10%, transparent);
}

.status {
  min-height: 1.25rem;
  margin-top: 12px;
  font-size: 0.9rem;
  color: var(--muted);
}

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

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

.audio-panel {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}

.audio-panel h2 {
  margin: 0 0 12px;
  font-size: 1rem;
  font-weight: 600;
}

audio {
  width: 100%;
  margin-bottom: 12px;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 0.85rem;
}

.footer-note {
  margin-top: 22px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.4;
}

code {
  background: var(--surface-2);
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 0.85em;
}

.subtitle a {
  color: var(--accent);
  text-decoration: none;
}

.subtitle a:hover {
  text-decoration: underline;
}

@media (max-width: 560px) {
  .card {
    padding: 20px;
  }

  .header-row {
    flex-direction: column;
  }

  .field-row {
    grid-template-columns: 1fr;
  }
}