:root {
  --bg: #0f0f12;
  --surface: #1a1a22;
  --surface-hover: #242430;
  --border: #2e2e3a;
  --text: #f0f0f5;
  --text-muted: #9898a8;
  --accent: #f8991c;
  --accent-hover: #ffad42;
  --progress: #f8991c;
  --danger: #e74c3c;
  --radius: 12px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
}

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

body {
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

.hidden {
  display: none !important;
}

/* Auth */
.auth-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  background: radial-gradient(ellipse at top, #1a1520 0%, var(--bg) 60%);
}

.auth-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.5rem;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow);
}

.auth-card h1 {
  font-size: 1.75rem;
  margin-bottom: 0.25rem;
}

.auth-card .subtitle {
  color: var(--text-muted);
  margin-bottom: 2rem;
  font-size: 0.95rem;
}

.form-group {
  margin-bottom: 1rem;
}

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

input, select {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 1rem;
}

input:focus, select:focus {
  outline: none;
  border-color: var(--accent);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--accent);
  color: #111;
  width: 100%;
  margin-top: 0.5rem;
}

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

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

.btn-secondary:hover {
  background: var(--border);
}

.btn-icon {
  padding: 0.5rem;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
}

.auth-toggle {
  text-align: center;
  margin-top: 1.5rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.auth-toggle button {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font-weight: 600;
}

.error-msg {
  background: rgba(231, 76, 60, 0.15);
  border: 1px solid var(--danger);
  color: #ff8a80;
  padding: 0.75rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

/* App shell */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

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

.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.section-header h2 {
  font-size: 1.5rem;
}

/* Library grid */
.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1.75rem;
}

.book-card {
  cursor: pointer;
  transition: transform 0.15s;
}

.book-card:hover {
  transform: translateY(-4px);
}

.book-cover {
  aspect-ratio: 1;
  border-radius: var(--radius);
  background: var(--surface-hover);
  overflow: hidden;
  position: relative;
  box-shadow: var(--shadow);
}

.book-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.book-cover .placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  color: var(--text-muted);
  background: linear-gradient(135deg, #2a2030, #1a1a22);
}

.progress-bar-mini {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: rgba(0, 0, 0, 0.5);
}

.progress-bar-mini .fill {
  height: 100%;
  background: var(--progress);
}

.book-info {
  margin-top: 0.75rem;
}

.book-info h3 {
  font-size: 0.95rem;
  font-weight: 600;
  line-clamp: 2;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.book-info p {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* Player view */
.player-view {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 2.5rem;
  align-items: start;
}

@media (max-width: 768px) {
  .player-view {
    grid-template-columns: 1fr;
  }
}

.player-cover {
  width: 100%;
  aspect-ratio: 1;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  background: var(--surface-hover);
  position: sticky;
  top: 5rem;
}

.player-cover-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.player-meta h1 {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
}

.player-meta .author {
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.player-meta .description {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
  max-height: 120px;
  overflow-y: auto;
}

/* Audio controls */
.player-controls {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.seek-bar {
  width: 100%;
  margin: 1rem 0;
  accent-color: var(--accent);
}

.time-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.control-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

.control-row .btn-play {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--accent);
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: #111;
}

.control-row .btn-play:hover {
  background: var(--accent-hover);
}

.speed-select {
  width: auto;
  padding: 0.4rem 0.6rem;
  font-size: 0.85rem;
}

.player-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

/* Chapters & bookmarks */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
}

.panel-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  font-weight: 600;
}

.panel-list {
  max-height: 280px;
  overflow-y: auto;
}

.panel-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.25rem;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
  transition: background 0.1s;
}

.panel-item:last-child {
  border-bottom: none;
}

.panel-item:hover,
.panel-item.active {
  background: var(--surface-hover);
}

.panel-item .time {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.panel-item .delete-btn {
  background: none;
  border: none;
  color: var(--danger);
  cursor: pointer;
  opacity: 0;
  font-size: 0.85rem;
}

.panel-item:hover .delete-btn {
  opacity: 1;
}

/* Host panel */
.host-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.host-panel h3 {
  margin-bottom: 1rem;
}

.panel-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.register-hint {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.create-user-form {
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.users-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.user-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 1rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.status-badge {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
}

.status-pending {
  background: rgba(248, 153, 28, 0.2);
  color: var(--accent);
}

.status-approved {
  background: rgba(46, 204, 113, 0.15);
  color: #6ee7a0;
}

.status-denied {
  background: rgba(231, 76, 60, 0.15);
  color: #ff8a80;
}

.user-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.btn-sm {
  padding: 0.4rem 0.75rem;
  font-size: 0.85rem;
}

.host-form {
  display: grid;
  grid-template-columns: 1fr 2fr auto auto;
  gap: 0.75rem;
  align-items: end;
}

@media (max-width: 768px) {
  .host-form {
    grid-template-columns: 1fr;
  }
}

.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
}

.empty-state h3 {
  color: var(--text);
  margin-bottom: 0.5rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  text-decoration: none;
  margin-bottom: 1.5rem;
  cursor: pointer;
  background: none;
  border: none;
  font-size: 0.95rem;
}

.back-link:hover {
  color: var(--text);
}