:root {
  color-scheme: light;
  --bg: oklch(0.965 0.012 85);
  --surface: oklch(0.99 0.006 85);
  --surface-strong: oklch(0.985 0.009 85);
  --text: oklch(0.24 0.022 170);
  --muted: oklch(0.43 0.024 170);
  --faint: oklch(0.49 0.02 170);
  --line: oklch(0.86 0.016 160);
  --line-strong: oklch(0.65 0.025 160);
  --accent: oklch(0.43 0.09 165);
  --accent-hover: oklch(0.36 0.075 165);
  --editorial: oklch(0.45 0.09 75);
  --editorial-soft: oklch(0.955 0.035 85);
  --editorial-line: oklch(0.82 0.055 80);
  --chip: oklch(0.94 0.012 160);
  --shadow: 0 18px 44px oklch(0.3 0.02 170 / 0.09);
  --radius-lg: 28px;
  --radius-md: 18px;
  --shell: min(1120px, calc(100vw - 40px));
  font-family:
    Inter,
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "PingFang SC",
    "Microsoft YaHei",
    sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  overflow-x: hidden;
}

a {
  color: inherit;
}

.shell {
  width: var(--shell);
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  border-radius: 10px;
  color: var(--surface);
  background: var(--accent);
  font-weight: 750;
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: none;
}

.eyebrow,
.section-label {
  color: var(--editorial);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.eyebrow {
  margin: 0;
}

.catalog {
  padding: clamp(44px, 6vw, 64px) 0 50px;
}

.catalog-heading {
  display: grid;
  grid-template-columns: 1fr minmax(280px, 420px);
  gap: 28px;
  align-items: end;
  margin-bottom: 24px;
}

.section-label {
  margin: 0 0 6px;
}

.result-count {
  margin: 0;
  color: var(--muted);
  font-size: 0.93rem;
}

.search-field {
  position: relative;
}

.search-field label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.search-field span {
  position: absolute;
  top: 50%;
  left: 17px;
  color: var(--faint);
  font-size: 1.35rem;
  transform: translateY(-52%);
  pointer-events: none;
}

.search-field input {
  width: 100%;
  min-height: 52px;
  padding: 0 18px 0 49px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--text);
  background: var(--surface);
  font: inherit;
  outline: none;
  transition:
    border-color 160ms ease,
    box-shadow 160ms ease;
}

.search-field input::placeholder {
  color: var(--faint);
}

.search-field input:focus-visible {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px oklch(0.74 0.06 165 / 0.22);
}

.episode-grid {
  display: grid;
  gap: 24px;
}

.episode-card {
  position: relative;
  padding: clamp(24px, 3.5vw, 40px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface-strong);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.episode-card[hidden] {
  display: none;
}

.episode-card-topline {
  display: flex;
  gap: 22px;
  align-items: center;
  justify-content: space-between;
}

.episode-number {
  display: inline-flex;
  padding: 7px 11px;
  border: 1px solid var(--editorial-line);
  border-radius: 999px;
  color: var(--editorial);
  background: var(--editorial-soft);
  font-size: 0.72rem;
  font-weight: 780;
  letter-spacing: 0.08em;
}

.episode-meta {
  display: flex;
  gap: 20px;
  margin: 0;
}

.episode-meta div {
  display: grid;
  grid-template-columns: auto auto;
  gap: 6px;
}

.episode-meta dt,
.episode-meta dd {
  margin: 0;
  font-size: 0.78rem;
}

.episode-meta dt {
  color: var(--faint);
}

.episode-meta dd {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.episode-card h2 {
  max-width: 760px;
  margin: 28px 0 12px;
  font-family: Georgia, "Noto Serif SC", "Songti SC", serif;
  font-size: clamp(1.7rem, 3vw, 2.65rem);
  font-weight: 540;
  letter-spacing: -0.025em;
  line-height: 1.16;
  text-wrap: balance;
}

.episode-card h2 a {
  text-decoration-color: transparent;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.12em;
  transition:
    color 150ms ease,
    text-decoration-color 150ms ease;
}

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

.episode-subtitle {
  max-width: 880px;
  margin: 0;
  color: var(--muted);
  font-size: 0.96rem;
  line-height: 1.55;
  text-wrap: pretty;
}

.episode-tldr {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  max-width: 880px;
  margin-top: 24px;
  padding: 16px 18px;
  border: 1px solid var(--editorial-line);
  border-radius: var(--radius-md);
  background: var(--editorial-soft);
}

.episode-tldr > span {
  color: var(--editorial);
  font-size: 0.76rem;
  font-weight: 820;
  letter-spacing: 0.12em;
  line-height: 1.6;
  white-space: nowrap;
}

.episode-tldr p {
  margin: 0;
  color: var(--text);
  font-size: 0.95rem;
  line-height: 1.6;
  overflow-wrap: break-word;
  text-wrap: pretty;
}

.topic-list {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.topic-chip {
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--muted);
  background: var(--chip);
  font-size: 0.76rem;
}

.episode-actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.button {
  display: inline-flex;
  min-height: 46px;
  gap: 9px;
  align-items: center;
  justify-content: center;
  padding: 0 17px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 0.84rem;
  font-weight: 730;
  text-decoration: none;
  transition:
    transform 150ms ease,
    border-color 150ms ease,
    background 150ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button:active {
  transform: scale(0.96);
}

.button:focus-visible,
.episode-card h2 a:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}

.button-primary {
  color: var(--surface);
  background: var(--accent);
}

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

.button-secondary {
  border-color: var(--line-strong);
  color: var(--muted);
  background: var(--surface);
}

.button-secondary:hover {
  border-color: var(--accent);
  color: var(--text);
}

.empty-state {
  margin: 40px 0;
  padding: 70px 20px;
  border: 1px dashed var(--line);
  border-radius: var(--radius-lg);
  color: var(--muted);
  text-align: center;
}

.site-footer {
  margin-top: 30px;
  padding: 30px 0 54px;
  color: var(--faint);
  font-size: 0.8rem;
}

.site-footer p {
  max-width: 720px;
  margin: 0;
}

.error-page {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 24px;
}

.error-card {
  width: min(640px, 100%);
  padding: clamp(32px, 7vw, 64px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.error-card h1 {
  margin: 0;
  font-family: Georgia, "Noto Serif SC", "Songti SC", serif;
  font-size: clamp(2rem, 7vw, 4rem);
  line-height: 1.08;
}

.error-card > p:not(.eyebrow) {
  margin: 24px 0 30px;
  color: var(--muted);
}

@media (prefers-contrast: more) {
  :root {
    --muted: oklch(0.34 0.024 170);
    --faint: oklch(0.4 0.02 170);
    --line: oklch(0.68 0.025 160);
    --line-strong: oklch(0.56 0.03 160);
    --accent: oklch(0.35 0.07 165);
    --editorial: oklch(0.36 0.075 75);
  }
}

@media (max-width: 760px) {
  :root {
    --shell: min(100% - 26px, 1120px);
  }

  .catalog {
    padding-top: 40px;
  }

  .catalog-heading {
    grid-template-columns: 1fr;
    align-items: stretch;
  }

  .episode-card-topline,
  .episode-meta {
    align-items: flex-start;
  }

  .episode-card-topline {
    flex-direction: column;
  }

  .episode-meta {
    flex-wrap: wrap;
  }

  .episode-card h2 {
    margin-top: 22px;
  }

  .episode-tldr {
    grid-template-columns: 1fr;
    gap: 4px;
    padding: 14px 16px;
  }

  .episode-actions .button {
    width: 100%;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
  }

  .button:hover,
  .button:active {
    transform: none;
  }
}

@media print {
  body {
    color: #111;
    background: #fff;
  }

  .search-field,
  .episode-actions,
  .site-footer {
    display: none;
  }

  .catalog {
    padding-top: 0;
  }

  .episode-card {
    border: 1px solid #bbb;
    color: #111;
    background: #fff;
    box-shadow: none;
  }

  .episode-subtitle,
  .episode-tldr p,
  .episode-meta dt,
  .episode-meta dd,
  .topic-chip {
    color: #333;
  }
}