:root {
  color-scheme: light;
  --paper: #f5f0e6;
  --surface: #fffdf8;
  --ink: #202523;
  --muted: #69716d;
  --faint: #a9aea9;
  --line: #ddd8cc;
  --accent: #146c5b;
  --accent-soft: #e3f0eb;
  --chapter: #8a4b2b;
  --shadow: 0 12px 32px rgb(51 43 30 / 8%);
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --serif: Charter, "Iowan Old Style", "Palatino Linotype", Georgia, serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5.5rem;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 85% 2%, rgb(20 108 91 / 9%), transparent 26rem),
    var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

button,
summary,
a {
  -webkit-tap-highlight-color: transparent;
}

.skip-link {
  position: fixed;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 100;
  padding: 0.65rem 0.85rem;
  border-radius: 0.5rem;
  background: var(--ink);
  color: white;
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.hero {
  width: min(100% - 2rem, 760px);
  margin: 0 auto;
  padding: max(3.5rem, env(safe-area-inset-top)) 0 2.25rem;
}

.eyebrow {
  margin-bottom: 1rem;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 780;
  letter-spacing: 0.14em;
}

h1 {
  max-width: 18ch;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(2.15rem, 10vw, 4.65rem);
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 0.99;
}

.episode-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  margin-top: 1.5rem;
  color: var(--muted);
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
}

.episode-meta span:not(:last-child)::after {
  content: "·";
  margin-left: 1rem;
  color: var(--faint);
}

.reader-note {
  max-width: 55ch;
  margin: 1.35rem 0 0;
  color: var(--muted);
  font-family: var(--serif);
  font-size: 1.02rem;
  line-height: 1.55;
}

.library-back {
  display: inline-block;
  margin-bottom: 1.15rem;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 750;
  text-decoration: none;
}

.library-back:hover,
.library-back:focus-visible {
  text-decoration: underline;
}

.reader-toolbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  width: min(100%, 820px);
  min-height: 3.75rem;
  margin: 0 auto 1rem;
  padding: 0.6rem max(1rem, env(safe-area-inset-left)) 0.6rem max(1rem, env(safe-area-inset-right));
  border: 1px solid rgb(221 216 204 / 80%);
  border-radius: 1rem;
  background: rgb(255 253 248 / 88%);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.chapter-nav {
  position: relative;
  flex: 1;
  min-width: 0;
}

.chapter-nav summary {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  min-height: 2.5rem;
  color: var(--ink);
  font-size: 0.86rem;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}

.chapter-nav summary::-webkit-details-marker {
  display: none;
}

.chapter-nav summary span {
  color: var(--accent);
  font-size: 1.2rem;
  font-weight: 400;
  transition: transform 180ms ease;
}

.chapter-nav[open] summary span {
  transform: rotate(45deg);
}

.chapter-nav ol {
  position: absolute;
  top: 2.8rem;
  left: -0.35rem;
  width: min(92vw, 620px);
  max-height: min(68vh, 34rem);
  margin: 0;
  padding: 0.65rem;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 0.85rem;
  background: var(--surface);
  box-shadow: 0 18px 55px rgb(38 34 27 / 18%);
  list-style: none;
}

.chapter-nav li + li {
  border-top: 1px solid var(--line);
}

.chapter-nav a {
  display: grid;
  grid-template-columns: 5.3rem 1fr;
  gap: 0.65rem;
  padding: 0.85rem 0.55rem;
  color: var(--ink);
  font-size: 0.84rem;
  line-height: 1.35;
  text-decoration: none;
}

.chapter-nav a span {
  color: var(--accent);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.74rem;
  font-variant-numeric: tabular-nums;
}

.language-toggle {
  min-height: 2.5rem;
  padding: 0 0.85rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--accent);
  font: 700 0.78rem/1 var(--sans);
  cursor: pointer;
}

.language-toggle:hover,
.language-toggle:focus-visible {
  border-color: var(--accent);
  outline: none;
}

.reader-vocabulary-link,
.vocabulary-link {
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  text-decoration: none;
}

.reader-vocabulary-link {
  display: inline-flex;
  align-items: center;
  min-height: 2.5rem;
  margin-left: 0.55rem;
  white-space: nowrap;
}

.reader-vocabulary-link span,
.vocabulary-link span {
  display: inline-grid;
  min-width: 1.35rem;
  min-height: 1.35rem;
  margin-left: 0.35rem;
  place-items: center;
  border-radius: 999px;
  background: var(--accent-soft);
  font-size: 0.68rem;
}

.vocabulary-link {
  display: inline-flex;
  align-items: center;
  margin-top: 1.25rem;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgb(255 253 248 / 72%);
}

main {
  width: min(100% - 2rem, 760px);
  margin: 0 auto;
}

.bilingual-block {
  padding: 0 0 2.6rem;
  border-bottom: 1px solid var(--line);
}

.bilingual-block + .bilingual-block {
  padding-top: 2.6rem;
}

.chapter-marker {
  scroll-margin-top: 5.5rem;
  margin: 1.1rem 0 2.25rem;
  padding: 1rem 0 0;
  border-top: 3px solid var(--chapter);
}

.chapter-marker span {
  color: var(--chapter);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.76rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

.chapter-marker h2 {
  max-width: 26ch;
  margin: 0.45rem 0 0;
  font-family: var(--serif);
  font-size: clamp(1.6rem, 7vw, 2.6rem);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.08;
}

.turn {
  scroll-margin-top: 5.5rem;
  border-radius: 0.7rem;
  transition: background-color 220ms ease;
}

.turn + .turn {
  margin-top: 1.75rem;
}

.turn:target {
  background: rgb(227 240 235 / 65%);
  box-shadow: 0 0 0 0.65rem rgb(227 240 235 / 65%);
}

.turn header {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  margin-bottom: 0.62rem;
}

.timestamp-button {
  flex: 0 0 auto;
  min-height: 2rem;
  padding: 0.34rem 0.56rem;
  border: 0;
  border-radius: 0.42rem;
  background: var(--accent-soft);
  color: var(--accent);
  font: 750 0.75rem/1 ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-variant-numeric: tabular-nums;
  cursor: copy;
}

.timestamp-button:hover,
.timestamp-button:focus-visible {
  box-shadow: 0 0 0 2px var(--accent);
  outline: none;
}

.timestamp-button.copied {
  background: var(--accent);
  color: white;
}

.speaker {
  overflow: hidden;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 760;
  letter-spacing: 0.02em;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.english {
  font-family: var(--serif);
  font-size: clamp(1.15rem, 4.8vw, 1.28rem);
  letter-spacing: -0.008em;
  line-height: 1.72;
}

.english p,
.translation p {
  margin: 0;
}

.english p + p {
  margin-top: 0.85em;
}

.translation {
  margin-top: 1.45rem;
  padding: 1rem 1rem 1rem 1.1rem;
  border-left: 3px solid #c9c8bd;
  border-radius: 0 0.65rem 0.65rem 0;
  background: rgb(255 253 248 / 62%);
  color: #69706c;
  font-size: 0.94rem;
  line-height: 1.78;
}

.translation-label {
  display: block;
  margin-bottom: 0.45rem;
  color: #7d827e;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.chinese-hidden .translation {
  display: none;
}

.copy-toast {
  position: fixed;
  right: 1rem;
  bottom: max(1rem, env(safe-area-inset-bottom));
  z-index: 40;
  padding: 0.7rem 0.9rem;
  border-radius: 999px;
  background: var(--ink);
  color: white;
  font-size: 0.78rem;
  opacity: 0;
  pointer-events: none;
  transform: translateY(0.75rem);
  transition: opacity 160ms ease, transform 160ms ease;
}

.copy-toast.visible {
  opacity: 1;
  transform: translateY(0);
}

.selection-action {
  position: fixed;
  right: 0;
  bottom: max(1rem, env(safe-area-inset-bottom));
  left: 0;
  z-index: 60;
  width: fit-content;
  max-width: calc(100% - 2rem);
  margin: auto;
}

.selection-action[hidden] {
  display: none;
}

.selection-action button {
  max-width: 100%;
  min-height: 3rem;
  padding: 0.8rem 1.1rem;
  overflow: hidden;
  border: 0;
  border-radius: 999px;
  background: var(--ink);
  box-shadow: 0 12px 35px rgb(32 37 35 / 28%);
  color: white;
  font: 750 0.86rem/1 var(--sans);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.library-hero {
  padding-bottom: 1.4rem;
}

.library-hero h1 {
  max-width: 13ch;
}

.library {
  display: grid;
  gap: 1.1rem;
}

.episode-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: rgb(255 253 248 / 90%);
  box-shadow: var(--shadow);
}

.episode-link {
  display: block;
  padding: 1.25rem;
  color: var(--ink);
  text-decoration: none;
}

.episode-link:hover h2,
.episode-link:focus-visible h2 {
  color: var(--accent);
}

.episode-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.episode-date,
.episode-podcast {
  color: var(--muted);
  font-size: 0.76rem;
  font-variant-numeric: tabular-nums;
}

.episode-podcast {
  margin-top: 0.7rem;
  color: var(--accent);
  font-weight: 800;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.episode-card h2 {
  max-width: 29ch;
  margin: 0.45rem 0 1rem;
  font-family: var(--serif);
  font-size: clamp(1.45rem, 6vw, 2rem);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.12;
  transition: color 160ms ease;
}

.open-episode {
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 800;
}

.chapter-preview {
  border-top: 1px solid var(--line);
}

.chapter-preview summary {
  padding: 0.9rem 1.25rem;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 750;
  cursor: pointer;
}

.chapter-preview ol {
  margin: 0;
  padding: 0 1.25rem 1.1rem;
  list-style: none;
}

.chapter-preview li {
  display: grid;
  grid-template-columns: 4.8rem 1fr;
  gap: 0.55rem;
  padding: 0.58rem 0;
  border-top: 1px solid rgb(221 216 204 / 70%);
  color: var(--muted);
  font-size: 0.76rem;
  line-height: 1.45;
}

.chapter-preview li span {
  color: var(--accent);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.7rem;
  font-variant-numeric: tabular-nums;
}

.empty-library {
  padding: 2rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--surface);
  color: var(--muted);
  text-align: center;
}

.vocabulary-hero h1 {
  max-width: 12ch;
}

.vocabulary-main {
  width: min(100% - 2rem, 760px);
}

.vocabulary-toolbar {
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: rgb(255 253 248 / 88%);
  box-shadow: var(--shadow);
}

.vocabulary-search {
  display: grid;
  gap: 0.45rem;
  color: var(--muted);
  font-size: 0.74rem;
  font-weight: 750;
}

.vocabulary-search input {
  width: 100%;
  min-height: 2.8rem;
  padding: 0 0.8rem;
  border: 1px solid var(--line);
  border-radius: 0.65rem;
  background: var(--surface);
  color: var(--ink);
  font: 1rem/1 var(--sans);
}

.vocabulary-actions,
.vocabulary-item-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 0.8rem;
}

.vocabulary-actions button,
.vocabulary-item-controls button,
.vocabulary-item-controls a {
  min-height: 2.35rem;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  background: transparent;
  color: var(--accent);
  font: 750 0.75rem/1 var(--sans);
  text-decoration: none;
}

.vocabulary-actions .danger-button,
.vocabulary-item-controls button {
  color: #94462d;
}

.vocabulary-status {
  min-height: 1.2rem;
  margin: 1rem 0 0.7rem;
  color: var(--muted);
  font-size: 0.76rem;
}

.vocabulary-list {
  display: grid;
  gap: 0.85rem;
}

.vocabulary-item {
  padding: 1.1rem;
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  background: rgb(255 253 248 / 88%);
}

.vocabulary-item-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.vocabulary-term {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.55rem;
  font-weight: 600;
}

.vocabulary-count,
.vocabulary-meta {
  color: var(--muted);
  font-size: 0.7rem;
}

.vocabulary-context {
  margin: 0.7rem 0 0;
  font-family: var(--serif);
  font-size: 1rem;
  line-height: 1.55;
}

.vocabulary-meta {
  margin: 0.7rem 0 0;
  line-height: 1.55;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  width: min(100% - 2rem, 760px);
  margin: 3rem auto 0;
  padding: 1.5rem 0 max(2.5rem, env(safe-area-inset-bottom));
  color: var(--muted);
  font-size: 0.7rem;
}

@media (min-width: 840px) {
  .reader-toolbar {
    margin-bottom: 2rem;
  }

  .bilingual-block {
    padding-bottom: 3.4rem;
  }

  .bilingual-block + .bilingual-block {
    padding-top: 3.4rem;
  }
}

@media (max-width: 520px) {
  .reader-toolbar {
    width: calc(100% - 1rem);
    border-radius: 0.85rem;
  }

  .episode-meta span:not(:last-child)::after {
    margin-left: 0.5rem;
  }

  .turn header {
    gap: 0.55rem;
  }

  footer {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}