/* ==========================================
   Babel Podcast — 墨韵 (Ink Resonance) Theme
   ========================================== */

:root,
[data-theme="dark"] {
  --bg-deep: #0a0908;
  --bg-primary: #100f0d;
  --bg-card: #171614;
  --bg-card-hover: #1e1c19;
  --bg-elevated: #242220;
  --text-primary: #ede6db;
  --text-secondary: #a09888;
  --text-muted: #605848;
  --accent: #c84b31;
  --accent-hover: #d95a40;
  --accent-dim: rgba(200, 75, 49, 0.12);
  --accent-glow: rgba(200, 75, 49, 0.06);
  --border: #2a2622;
  --border-hover: #3a3632;
  --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
  --grain-opacity: 0.035;
  --font-serif: "Noto Serif SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Cascadia Code", monospace;
  --max-width: 860px;
  --radius: 10px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --bg-deep: #f5f2ed;
  --bg-primary: #faf8f5;
  --bg-card: #ffffff;
  --bg-card-hover: #faf8f5;
  --bg-elevated: #f0ece6;
  --text-primary: #1a1714;
  --text-secondary: #5c5548;
  --text-muted: #9c9080;
  --accent: #b8432a;
  --accent-hover: #d44f35;
  --accent-dim: rgba(184, 67, 42, 0.08);
  --accent-glow: rgba(184, 67, 42, 0.04);
  --border: #e5e0d8;
  --border-hover: #d5cfc5;
  --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.06);
  --grain-opacity: 0.018;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-primary);
  background: var(--bg-deep);
  min-height: 100vh;
}

/* Top accent line */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
  z-index: 1000;
  pointer-events: none;
}

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

a:hover {
  color: var(--accent-hover);
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

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

/* --- Container --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

/* --- Grain Overlay --- */
.grain {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 999;
  opacity: var(--grain-opacity);
}

/* --- Header --- */
header {
  padding: 2.5rem 0 2rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 3rem;
  background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-deep) 100%);
  animation: fade-up 0.4s ease both;
}

.header-inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.site-brand {
  display: flex;
  flex-direction: column;
}

.site-title-row {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.seal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.4rem;
  height: 2.4rem;
  border: 2px solid var(--accent);
  color: var(--accent);
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 900;
  transform: rotate(-4deg);
  flex-shrink: 0;
  transition: transform var(--transition), box-shadow var(--transition);
  animation: seal-appear 0.6s ease 0.2s both;
}

.seal:hover {
  transform: rotate(0deg);
  box-shadow: 0 0 12px var(--accent-dim);
}

.site-title {
  font-family: var(--font-serif);
  font-size: 1.65rem;
  font-weight: 900;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.site-title:hover {
  color: var(--text-primary);
}

.site-description {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-top: 0.4rem;
  padding-left: 3.25rem;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.25rem;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition);
}

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

.theme-toggle svg {
  width: 16px;
  height: 16px;
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  display: none;
}

[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

[data-theme="light"] .theme-toggle .icon-moon {
  display: block;
}

.rss-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: all var(--transition);
  white-space: nowrap;
}

.rss-link:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-dim);
}

.rss-link svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

/* --- Episode List --- */
.episode-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

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

.list-header h2 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-secondary);
}

.episode-count {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* --- Episode Card --- */
.episode-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem 1.75rem 1.5rem;
  overflow: hidden;
  transition: border-color var(--transition), background-color var(--transition), box-shadow var(--transition);
  animation: fade-up 0.5s ease both;
  animation-delay: calc(var(--i, 0) * 0.08s);
}

.episode-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--accent);
  opacity: 0.6;
  transition: opacity var(--transition);
}

.episode-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  box-shadow: var(--card-shadow);
}

.episode-card:hover::before {
  opacity: 1;
}

.episode-card h2 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 0.5rem;
}

.episode-card h2 a {
  color: var(--text-primary);
  transition: color var(--transition);
}

.episode-card:hover h2 a {
  color: var(--accent);
}

.episode-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-muted);
  font-size: 0.82rem;
  font-family: var(--font-mono);
  margin-bottom: 0.85rem;
}

.episode-meta .sep {
  opacity: 0.4;
}

.episode-summary {
  color: var(--text-secondary);
  font-size: 0.93rem;
  line-height: 1.85;
  margin-bottom: 1.25rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.episode-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.detail-link {
  color: var(--text-muted);
  font-size: 0.85rem;
  transition: color var(--transition);
  flex-shrink: 0;
}

.detail-link:hover {
  color: var(--accent);
}

/* --- Custom Audio Player --- */
.player {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex: 1;
  min-width: 0;
}

.player-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  flex-shrink: 0;
  transition: all var(--transition);
}

.player-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-dim);
}

.player-btn svg {
  width: 14px;
  height: 14px;
}

.player.playing .player-btn {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-dim);
}

.player-track {
  position: relative;
  flex: 1;
  height: 3px;
  background: var(--border);
  border-radius: 1.5px;
  cursor: pointer;
  overflow: hidden;
  transition: height 0.15s ease;
}

.player:hover .player-track,
.player.playing .player-track {
  height: 5px;
  border-radius: 2.5px;
}

.player-fill {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  background: var(--accent);
  border-radius: inherit;
  width: 0%;
}

.player-time {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  min-width: 5em;
  text-align: right;
}

/* Large player (episode detail page) */
.player-large {
  gap: 1rem;
  padding: 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.player-large .player-btn {
  width: 48px;
  height: 48px;
}

.player-large .player-btn svg {
  width: 18px;
  height: 18px;
}

.player-large .player-track {
  height: 4px;
}

.player-large:hover .player-track,
.player-large.playing .player-track {
  height: 6px;
  border-radius: 3px;
}

.player-large .player-time {
  font-size: 0.82rem;
}

/* --- Episode Detail --- */
.episode-detail {
  animation: fade-up 0.5s ease both;
}

.episode-detail > .back-link:first-child {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.88rem;
  margin-bottom: 2rem;
  transition: color var(--transition);
}

.episode-detail > .back-link:first-child:hover {
  color: var(--accent);
}

.episode-detail > h2 {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 900;
  line-height: 1.45;
  margin-bottom: 0.75rem;
  letter-spacing: -0.01em;
}

.episode-detail > .episode-meta {
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

/* Audio sections */
.audio-section {
  margin-bottom: 1.5rem;
}

.audio-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.75rem;
}

.lang-badge {
  display: inline-block;
  padding: 0.15em 0.5em;
  background: var(--accent-dim);
  color: var(--accent);
  border-radius: 4px;
  font-size: 0.78rem;
  font-weight: 600;
}

/* Content sections */
.content-section {
  margin: 2.5rem 0;
}

.section-heading {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
  letter-spacing: 0.04em;
}

.summary-text p {
  color: var(--text-secondary);
  line-height: 2;
  font-size: 0.95rem;
}

/* --- Detailed Summary (Markdown) --- */
.detailed-summary > *:first-child {
  margin-top: 0;
}

.detailed-summary h1 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 900;
  margin: 2.5rem 0 1rem;
  color: var(--text-primary);
}

.detailed-summary h2 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  margin: 2.25rem 0 0.85rem;
  color: var(--text-primary);
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}

.detailed-summary h3 {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  margin: 1.75rem 0 0.65rem;
  color: var(--text-primary);
}

.detailed-summary h4 {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-weight: 700;
  margin: 1.5rem 0 0.5rem;
  color: var(--text-secondary);
}

.detailed-summary p {
  margin-bottom: 1rem;
  color: var(--text-secondary);
  line-height: 2;
}

.detailed-summary strong {
  color: var(--text-primary);
  font-weight: 600;
}

.detailed-summary a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: var(--accent-dim);
}

.detailed-summary a:hover {
  text-decoration-color: var(--accent);
}

.detailed-summary ul,
.detailed-summary ol {
  margin: 0.75rem 0 1.25rem 1.5rem;
  color: var(--text-secondary);
}

.detailed-summary li {
  margin-bottom: 0.35rem;
  line-height: 1.9;
}

.detailed-summary li::marker {
  color: var(--text-muted);
}

.detailed-summary hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

.detailed-summary blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.5rem 0 0.5rem 1.25rem;
  margin: 1.25rem 0;
  background: var(--accent-glow);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.detailed-summary blockquote p {
  color: var(--text-secondary);
  font-style: italic;
}

.detailed-summary blockquote p:last-child {
  margin-bottom: 0;
}

.detailed-summary code {
  font-family: var(--font-mono);
  background: var(--bg-elevated);
  color: var(--accent);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-size: 0.88em;
}

.detailed-summary pre {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  overflow-x: auto;
  margin: 1.25rem 0;
}

.detailed-summary pre code {
  background: none;
  color: var(--text-primary);
  padding: 0;
  font-size: 0.85rem;
  line-height: 1.65;
}

.detailed-summary table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0;
  font-size: 0.9rem;
}

.detailed-summary th,
.detailed-summary td {
  border: 1px solid var(--border);
  padding: 0.65rem 0.85rem;
  text-align: left;
}

.detailed-summary th {
  background: var(--bg-card);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.85rem;
}

.detailed-summary td {
  color: var(--text-secondary);
}

.detailed-summary img {
  max-width: 100%;
  border-radius: var(--radius);
}

/* --- Back Link (bottom) --- */
.back-link-bottom {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.88rem;
  transition: color var(--transition);
}

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

/* --- Footer --- */
footer {
  margin-top: 4rem;
  padding: 2rem 0;
  text-align: center;
}

.footer-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
  margin-bottom: 2rem;
}

footer p {
  color: var(--text-muted);
  font-size: 0.82rem;
}

footer a {
  color: var(--text-secondary);
}

footer a:hover {
  color: var(--accent);
}

/* --- Empty State --- */
.empty {
  color: var(--text-muted);
  text-align: center;
  padding: 4rem 0;
  font-size: 0.95rem;
}

.empty code {
  font-family: var(--font-mono);
  background: var(--bg-card);
  padding: 0.2em 0.6em;
  border-radius: 4px;
  font-size: 0.85em;
  color: var(--accent);
}

/* --- Dragging state --- */
body.dragging {
  cursor: grabbing !important;
  user-select: none;
}

/* --- Animations --- */
@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes seal-appear {
  from {
    opacity: 0;
    transform: rotate(-15deg) scale(0.8);
  }
  to {
    opacity: 1;
    transform: rotate(-4deg) scale(1);
  }
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-deep);
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

* {
  scrollbar-width: thin;
  scrollbar-color: var(--border) var(--bg-deep);
}

/* --- Light mode overrides --- */
[data-theme="light"] ::selection {
  color: #fff;
}

[data-theme="light"] .episode-card {
  border-color: var(--border);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

[data-theme="light"] .player-large {
  background: var(--bg-elevated);
}

/* --- Responsive --- */
@media (max-width: 640px) {
  .container {
    padding: 0 1.25rem;
  }

  header {
    padding: 2rem 0 1.5rem;
    margin-bottom: 2rem;
  }

  .header-inner {
    flex-direction: column;
    gap: 1rem;
  }

  .site-description {
    padding-left: 3.25rem;
  }

  .seal {
    width: 2rem;
    height: 2rem;
    font-size: 0.85rem;
  }

  .site-title {
    font-size: 1.35rem;
  }

  .episode-card {
    padding: 1.25rem;
  }

  .episode-card h2 {
    font-size: 1.05rem;
  }

  .episode-footer {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }

  .detail-link {
    text-align: right;
  }

  .episode-detail > h2 {
    font-size: 1.35rem;
  }

  .player-large {
    padding: 1rem;
  }

  .player-large .player-btn {
    width: 40px;
    height: 40px;
  }

  .player-time {
    display: none;
  }

  .player-large .player-time {
    display: block;
  }

  .detailed-summary h1 { font-size: 1.2rem; }
  .detailed-summary h2 { font-size: 1.1rem; }
  .detailed-summary h3 { font-size: 1rem; }
}