:root {
  --bg: #0f0f12;
  --card: #1a1a22;
  --text: #f0f0f5;
  --muted: #9a9aad;
  --accent: #1db954;
  --accent-hover: #1ed760;
  --error: #ff6b6b;
  --warning: #e6a700;
  --border: #2a2a36;
}

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

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

.container {
  max-width: 560px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

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

h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.subtitle {
  color: var(--muted);
  margin-top: 0.35rem;
  font-size: 0.95rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 1rem;
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

input[type="url"] {
  width: 100%;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

input[type="url"]:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.hint {
  color: var(--muted);
  font-size: 0.8rem;
  margin-bottom: 1rem;
}

button,
.btn-download-file {
  display: block;
  width: 100%;
  padding: 0.9rem 1rem;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #000;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  transition: background 0.15s;
}

button:hover:not(:disabled),
.btn-download-file:hover {
  background: var(--accent-hover);
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.hidden {
  display: none !important;
}

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.75rem;
  gap: 0.5rem;
}

#progress-summary {
  font-weight: 600;
  font-size: 0.95rem;
}

.progress-meta {
  color: var(--muted);
  font-size: 0.75rem;
  white-space: nowrap;
}

.progress-bar {
  height: 10px;
  background: var(--bg);
  border-radius: 5px;
  overflow: hidden;
  margin-bottom: 1rem;
}

.global-bar {
  margin-bottom: 1.25rem;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: var(--accent);
  border-radius: 5px;
  transition: width 0.25s ease;
}

.progress-fill.indeterminate {
  animation: progress-pulse 1.5s ease-in-out infinite;
}

@keyframes progress-pulse {
  0%, 100% { opacity: 0.5; width: 20%; }
  50% { opacity: 1; width: 70%; }
}

.stepper {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
}

.stepper li {
  display: grid;
  grid-template-columns: 28px 1fr auto;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0;
  border-left: 2px solid var(--border);
  margin-left: 12px;
  padding-left: 12px;
  color: var(--muted);
  font-size: 0.85rem;
}

.stepper li.active {
  border-left-color: var(--accent);
  color: var(--text);
}

.stepper li.done {
  border-left-color: var(--accent);
  color: var(--accent);
}

.stepper li.done .step-icon {
  background: var(--accent);
  color: #000;
}

.stepper li.active .step-icon {
  background: var(--warning);
  color: #000;
  animation: pulse-icon 1s infinite;
}

.stepper li.pending {
  opacity: 0.5;
}

.stepper li.optional-hidden {
  display: none;
}

.step-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--border);
  font-size: 0.7rem;
  font-weight: 700;
}

.step-time {
  font-size: 0.75rem;
  color: var(--muted);
  min-width: 3rem;
  text-align: right;
}

@keyframes pulse-icon {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.08); }
}

.progress-text {
  color: var(--muted);
  font-size: 0.85rem;
  word-break: break-word;
  margin-bottom: 0.75rem;
}

.slowest-panel {
  background: #1f1a0a;
  border: 1px solid var(--warning);
  border-radius: 8px;
  padding: 0.65rem 0.85rem;
  font-size: 0.85rem;
  margin-bottom: 1rem;
  color: #f0d060;
}

.tracks-list {
  list-style: none;
  max-height: 220px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem;
}

.tracks-list li {
  padding: 0.5rem 0.35rem;
  border-bottom: 1px solid var(--border);
}

.tracks-list li:last-child {
  border-bottom: none;
}

.track-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.35rem;
}

.track-name {
  font-size: 0.8rem;
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.track-badge {
  font-size: 0.65rem;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  background: var(--border);
  color: var(--muted);
  flex-shrink: 0;
}

.track-badge.downloading { background: #1a3d2a; color: var(--accent); }
.track-badge.converting { background: #3d3a1a; color: var(--warning); }
.track-badge.embedding { background: #2a2a3d; color: #a0a0ff; }
.track-badge.done { background: #1a3d2a; color: var(--accent); }
.track-badge.error { background: #3d1a1a; color: var(--error); }

.track-mini-bar {
  height: 4px;
  background: var(--bg);
  border-radius: 2px;
  overflow: hidden;
}

.track-mini-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.2s;
}

.card.success {
  border-color: var(--accent);
}

.card.warning {
  border-color: var(--warning);
  background: #1f1a0a;
}

.card.warning p {
  color: #f0d060;
  font-size: 0.9rem;
}

.card.error {
  border-color: var(--error);
}

.card.error p {
  color: var(--error);
}

#result-text {
  margin-bottom: 1rem;
  font-weight: 500;
}

footer {
  text-align: center;
  margin-top: 2rem;
}

footer p {
  color: var(--muted);
  font-size: 0.75rem;
}