:root {
  --bg: #0a0a0a;
  --surface: #141414;
  --surface-hover: #1f1f1f;
  --border: #2a2a2a;
  --text: #ffffff;
  --text-muted: #b3b3b3;
  --accent: #1db954;
  --accent-hover: #1ed760;
  --danger: #e91429;
  --radius: 12px;
}

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

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

.app {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.logo h1 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text);
}

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

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
}

.card h2 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

.card h3 {
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
  color: var(--text-muted);
}

.form-grid {
  display: grid;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.form-group input,
.form-group select,
#duration-select,
#offset-input,
#playlist-input,
#my-playlists-select {
  width: 100%;
  padding: 0.65rem 0.85rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 0.95rem;
}

#duration-select,
#my-playlists-select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='%23b3b3b3'%3E%3Cpath d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2rem;
}

.form-group input:focus,
.form-group select:focus,
#duration-select:focus,
#offset-input:focus,
#playlist-input:focus,
#my-playlists-select:focus {
  outline: none;
  border-color: var(--accent);
}

.form-group-checkbox {
  display: flex;
  align-items: flex-end;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  cursor: pointer;
  font-size: 0.95rem;
  color: var(--text);
  padding: 0.65rem 0;
  margin-bottom: 0;
}

.checkbox-label input[type="checkbox"]:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.checkbox-label input[type="checkbox"] {
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--accent);
  cursor: pointer;
}

.fade-ios-hint {
  margin-top: 0.35rem;
  line-height: 1.35;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.25rem;
  border: none;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  text-decoration: none;
  color: var(--text);
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--accent);
  color: #000;
}

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

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

.btn-secondary:hover {
  background: #2a2a2a;
}

.btn-large {
  padding: 0.85rem 2rem;
  font-size: 1rem;
  width: 100%;
}

.btn-icon {
  width: 48px;
  height: 48px;
  padding: 0;
  font-size: 1.25rem;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 50%;
}

.btn-icon:hover {
  background: var(--surface-hover);
}

.btn-icon-large {
  width: 64px;
  height: 64px;
  padding: 0;
  font-size: 1.5rem;
  border-radius: 50%;
}

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

.hidden {
  display: none !important;
}

.error {
  color: var(--danger);
  margin-top: 1rem;
  font-size: 0.9rem;
}

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

.status {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  padding: 0.5rem;
}

.playlist-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.playlist-image {
  width: 80px;
  height: 80px;
  border-radius: 8px;
  object-fit: cover;
}

.now-playing {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: var(--bg);
  border-radius: var(--radius);
  margin-bottom: 1.25rem;
}

.track-image {
  width: 72px;
  height: 72px;
  border-radius: 8px;
  object-fit: cover;
  background: var(--surface-hover);
}

.track-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  margin-bottom: 0.25rem;
}

.track-info h3 {
  font-size: 1.1rem;
  margin-bottom: 0.15rem;
  color: var(--text);
}

.progress-container {
  margin-bottom: 1.25rem;
}

.progress-bar {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: var(--accent);
  border-radius: 3px;
  transition: width 0.1s linear;
}

.progress-labels {
  display: flex;
  justify-content: space-between;
  margin-top: 0.4rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.mobile-hint {
  text-align: center;
  margin-bottom: 1.25rem;
  line-height: 1.4;
}

.track-list-container {
  max-height: 320px;
  overflow-y: auto;
}

.track-list {
  list-style: none;
}

.track-list li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0.75rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
}

.track-list li:hover {
  background: var(--surface-hover);
}

.track-list li.active {
  background: rgba(29, 185, 84, 0.15);
  color: var(--accent);
}

.track-list li .track-num {
  width: 1.5rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.track-list li.active .track-num {
  color: var(--accent);
}

.track-list li .track-details {
  flex: 1;
  min-width: 0;
}

.track-list li .track-title {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.track-list li .track-artist-small {
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

#login-section {
  text-align: center;
}

.setup-hint {
  margin-top: 1.25rem;
  padding: 1rem;
  background: var(--bg);
  border-radius: 8px;
  border: 1px solid var(--border);
  text-align: left;
}

.setup-hint code {
  display: block;
  margin: 0.5rem 0;
  padding: 0.5rem 0.75rem;
  background: var(--surface-hover);
  border-radius: 6px;
  font-size: 0.85rem;
  word-break: break-all;
}

.small {
  font-size: 0.8rem;
}

.verify-status {
  margin-top: 0.75rem;
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  font-size: 0.85rem;
}

.verify-status.ok {
  background: rgba(29, 185, 84, 0.15);
  color: var(--accent);
}

.verify-status.fail {
  background: rgba(233, 20, 41, 0.15);
  color: var(--danger);
}

#login-section p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.settings-card .btn-secondary {
  margin-top: 0.5rem;
  margin-right: 0.5rem;
}

#my-playlists-section {
  margin-top: 1rem;
}

#my-playlists-section label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

#my-playlists-select {
  width: 100%;
  padding: 0.65rem 0.85rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 0.95rem;
}

@media (min-width: 600px) {
  .form-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }

  .form-group:first-child {
    grid-column: 1 / -1;
  }

  .form-group-checkbox {
    grid-column: 1 / -1;
  }
}