/* HCI home only; no chapter or summary imports this stylesheet.
   Uses the tokens from readability.css/themes.css so the home matches the chapters. */
.home-page {
  background: var(--surface);
}
.home-header,
.home-main {
  max-width: 1080px;
}
.home-header {
  height: 76px;
}
.home-header .brand small {
  letter-spacing: 0.08em;
}
.home-header nav {
  flex-wrap: wrap;
  gap: 20px;
}
.home-header nav a,
.material-list a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
.home-header nav a {
  color: var(--ink-2);
  font-size: 14px;
}

/* Hero */
.home-hero {
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 48px;
  padding: 56px 0 48px;
}
.home-hero h1 {
  margin: 0 0 18px;
  font-size: clamp(34px, 3.6vw, 48px);
  line-height: 1.25;
  letter-spacing: -0.045em;
}
.home-hero h1 span {
  display: block;
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.46em;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.home-hero .lede {
  max-width: none;
  color: var(--ink-2);
  font-size: 17px;
  line-height: 1.85;
}
.home-hero .hero-links {
  gap: 20px;
  margin-top: 26px;
  font-size: 15px;
}
.home-hero .primary {
  padding: 11px 20px;
  border-radius: 8px;
  background: var(--blue);
  font-size: 15px;
}
.home-cover {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--surface-2);
}
.home-cover img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 3/2;
  object-fit: cover;
}

/* Sections */
.home-section {
  padding-block: 48px;
  border-top: 1px solid var(--line);
}
.home-section h2 {
  margin: 0 0 8px;
  font-size: 28px;
  letter-spacing: -0.03em;
}
.home-section > .muted {
  color: var(--ink-2);
  font-size: 15.5px;
}

/* Chapter list: one row per chapter, like a syllabus. */
.chapter-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 24px;
}
.chapter-card {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr) 200px;
  gap: 8px 24px;
  align-items: start;
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--surface);
  overflow: visible;
}
.chapter-card-head {
  display: grid;
  gap: 2px;
  padding: 0;
  color: var(--muted);
  font-size: 13px;
}
.chapter-no {
  color: var(--blue);
  font-size: 22px;
  font-weight: 750;
  letter-spacing: -0.02em;
  line-height: 1.3;
}
.chapter-card-content {
  padding: 0;
}
.chapter-card-content h3 {
  margin: 0 0 6px;
  font-size: 21px;
  letter-spacing: -0.02em;
}
.chapter-card-content > p {
  min-height: 0;
  color: var(--ink-2);
  font-size: 15.5px;
  line-height: 1.8;
}
.chapter-topics {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}
.chapter-topics li {
  padding: 2px 10px;
  border-radius: 6px;
  background: var(--surface-2);
  color: var(--ink-2);
  font-size: 14px;
  line-height: 1.7;
}
.chapter-actions {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  margin: 0;
  padding: 0;
}
.chapter-actions a {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 8px 12px;
  border-radius: 8px;
  background: var(--blue);
  color: #fff;
  font-size: 14px;
  font-weight: 650;
  text-align: center;
}
.chapter-actions a:nth-child(2) {
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: var(--ink);
}
.chapter-actions a:hover {
  filter: none;
  text-decoration: underline;
}

/* Study path and activities */
.study-path {
  gap: 24px;
  margin-top: 24px;
}
.study-path article {
  padding-top: 18px;
  border-top: 2px solid var(--line);
}
.study-path article > b {
  color: var(--blue);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}
.study-path h3 {
  margin: 8px 0;
  font-size: 19px;
}
.study-path p {
  color: var(--ink-2);
  font-size: 15.5px;
  line-height: 1.85;
}
.home-section .reading-note {
  margin-top: 22px;
  color: var(--muted);
  font-size: 14px;
}
.material-list {
  gap: 10px;
  margin-top: 22px;
}
.material-list a {
  padding: 10px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  font-size: 15px;
}
.home-footer {
  color: var(--muted);
  font-size: 13px;
}

[data-theme='dark'] .home-page {
  background: #101620;
}
[data-theme='dark'] .chapter-card,
[data-theme='dark'] .material-list a {
  background: var(--surface);
  border-color: var(--line);
}
[data-theme='dark'] .chapter-actions a {
  background: #2164b5;
  color: #fff;
}
[data-theme='dark'] .chapter-actions a:nth-child(2) {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--ink);
}
[data-theme='dark'] .chapter-topics li {
  color: var(--ink-2);
}

@media (max-width: 850px) {
  .home-hero {
    gap: 24px;
  }
  .home-header .brand small {
    display: none;
  }
  .home-header nav {
    gap: 15px;
  }
  .chapter-card {
    grid-template-columns: 64px minmax(0, 1fr);
  }
  .chapter-actions {
    grid-column: 2;
    grid-template-columns: 1fr 1fr;
    margin-top: 8px;
  }
}
@media (max-width: 650px) {
  .home-hero {
    grid-template-columns: 1fr;
    padding-top: 32px;
  }
  .home-hero h1 {
    font-size: clamp(30px, 7.8vw, 40px);
  }
  .home-header {
    height: auto;
    min-height: 68px;
    flex-wrap: wrap;
    padding-block: 12px;
    gap: 8px 14px;
  }
  .home-header nav {
    gap: 14px;
  }
  .home-header nav a {
    padding-block: 4px;
  }
  .chapter-card {
    grid-template-columns: 1fr;
    padding: 18px;
  }
  .chapter-card-head {
    display: flex;
    align-items: baseline;
    gap: 12px;
  }
  .chapter-actions {
    grid-column: auto;
    grid-template-columns: 1fr;
  }
  .home-section {
    padding-block: 36px;
  }
}
@media print {
  .home-cover {
    display: none;
  }
  .home-hero {
    display: block;
  }
  .chapter-card {
    break-inside: avoid;
  }
  .home-page,
  [data-theme='dark'] .home-page {
    background: #fff !important;
    color: #111 !important;
  }
  .home-page .chapter-actions a,
  .home-page .hero-links a {
    background: #fff !important;
    color: #222 !important;
    border: 1px solid #999;
  }
}