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

:root {
  --bg: #f4f6fb;
  --surface: #ffffff;
  --text: #1a2332;
  --text-muted: #5c6b80;
  --accent: #2563eb;
  --accent-soft: #dbeafe;
  --accent-dark: #1d4ed8;
  --border: #e2e8f0;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  --radius: 16px;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Noto Sans SC', 'DM Sans', system-ui, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top right, #dbeafe 0%, transparent 45%),
    radial-gradient(circle at bottom left, #e0e7ff 0%, transparent 40%),
    var(--bg);
  line-height: 1.5;
}

.site-header {
  max-width: 880px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 1.5rem;
  text-align: center;
}

.site-kicker {
  margin: 0 0 0.5rem;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.site-title {
  margin: 0;
  font-family: 'DM Sans', sans-serif;
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.site-desc {
  margin: 0.75rem 0 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.layout {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 1.25rem 3rem;
  display: grid;
  gap: 1.5rem;
}

.player-section {
  position: sticky;
  top: 0.75rem;
  z-index: 10;
}

.player-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.player-meta {
  padding: 1.25rem 1.25rem 0.75rem;
}

.player-label {
  margin: 0 0 0.35rem;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
}

.player-title {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
}

.player-subtitle {
  margin: 0.35rem 0 0;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.player-media {
  padding: 0 1.25rem 1.25rem;
}

.player-loading {
  margin: 0 1.25rem 0.75rem;
  padding: 0.85rem 1rem;
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 12px;
}

.player-loading-bar {
  height: 4px;
  background: #e2e8f0;
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 0.55rem;
}

.player-loading-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), #60a5fa);
  border-radius: 999px;
  transition: width 0.2s ease;
}

.player-loading.is-indeterminate .player-loading-bar {
  position: relative;
}

.player-loading.is-indeterminate .player-loading-fill {
  position: absolute;
  width: 35%;
  animation: loading-slide 1.1s ease-in-out infinite;
}

@keyframes loading-slide {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(320%); }
}

.player-loading-text {
  margin: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.player-loading-speed {
  flex-shrink: 0;
  font-family: 'DM Sans', ui-monospace, monospace;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent-dark);
}

.player-media .player-audio,
.player-media .player-video {
  display: block;
  width: 100%;
  border-radius: 12px;
  background: #0f172a;
}

.player-media .player-audio {
  height: 48px;
}

.player-media .player-video {
  max-height: 54px;
  object-fit: cover;
  object-position: center;
}

.list-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
}

.list-heading {
  margin: 0 0 1rem;
  font-size: 1rem;
  font-weight: 700;
}

.episode-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.65rem;
}

.episode-card {
  width: 100%;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 0.85rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fafbfd;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, transform 0.15s;
}

.episode-card:hover {
  border-color: #bfdbfe;
  background: #f8fbff;
  transform: translateY(-1px);
}

.episode-card.active {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.episode-no {
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-family: 'DM Sans', sans-serif;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-dark);
}

.episode-card.active .episode-no {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.episode-body {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 0;
}

.episode-title-zh {
  font-weight: 600;
  font-size: 0.95rem;
}

.episode-title-en {
  font-family: 'DM Sans', sans-serif;
  font-size: 0.82rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

@media (max-width: 540px) {
  .player-section {
    position: static;
  }
}