:root {
  --arc-ink: #15130f;
  --arc-muted: #655f55;
  --arc-paper: #fbfaf6;
  --arc-panel: #ffffff;
  --arc-line: #ded8cc;
  --arc-red: #b63d2f;
  --arc-blue: #245f8f;
  --arc-green: #1f7a64;
  --arc-gold: #b77a25;
  --arc-shadow: 0 18px 44px rgba(35, 31, 24, 0.10);
}

body {
  background:
    linear-gradient(90deg, rgba(36, 95, 143, 0.06) 1px, transparent 1px),
    linear-gradient(0deg, rgba(31, 122, 100, 0.05) 1px, transparent 1px),
    var(--arc-paper);
  background-size: 42px 42px;
  color: var(--arc-ink);
  font-family: Aptos, "IBM Plex Sans", "Helvetica Neue", sans-serif;
}

h1,
h2,
h3,
.navbar-title {
  color: var(--arc-ink);
  font-family: Charter, "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  letter-spacing: 0;
}

a {
  color: var(--arc-blue);
}

#quarto-document-content mjx-container[display="true"] {
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.2rem 0;
}

.navbar {
  border-bottom: 1px solid var(--arc-line);
  background: rgba(251, 250, 246, 0.94);
  backdrop-filter: blur(14px);
}

.quarto-title-block {
  border-bottom: 1px solid var(--arc-line);
  margin-bottom: 1.4rem;
}

#quarto-document-content section.level3 > h3 {
  margin-top: 1.8rem;
  padding: 0.55rem 0.8rem;
  border-left: 4px solid var(--arc-gold);
  border-radius: 0 6px 6px 0;
  background: linear-gradient(90deg, rgba(183, 122, 37, 0.14), transparent);
  font-size: 1.25rem;
  line-height: 1.35;
}

.home-intro,
.category-hero,
.section-block,
.paper-section {
  width: min(1180px, calc(100vw - 32px));
  margin: 0 auto 2rem;
}

.home-intro,
.category-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.5rem, 4vw, 3rem);
  border: 1px solid var(--arc-line);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(182, 61, 47, 0.12), transparent 42%),
    linear-gradient(315deg, rgba(31, 122, 100, 0.16), transparent 46%),
    var(--arc-panel);
  box-shadow: var(--arc-shadow);
}

.home-intro::after,
.category-hero::after {
  content: "";
  position: absolute;
  right: 1.1rem;
  bottom: 1rem;
  width: 120px;
  height: 120px;
  border-right: 2px solid rgba(183, 122, 37, 0.48);
  border-bottom: 2px solid rgba(183, 122, 37, 0.48);
  pointer-events: none;
}

.eyebrow {
  margin: 0 0 0.55rem;
  color: var(--arc-red);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.language-switch {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 0.85rem;
}

.language-switch > a,
.language-toggle {
  display: inline-flex;
  align-items: center;
  border: 1px solid rgba(36, 95, 143, 0.26);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
}

.language-switch > a {
  min-height: 34px;
  padding: 0.32rem 0.7rem;
  color: var(--arc-blue);
  font-size: 0.84rem;
  font-weight: 800;
  text-decoration: none;
}

.language-toggle {
  gap: 0.15rem;
  padding: 0.15rem;
}

.language-toggle-option {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 54px;
  min-height: 30px;
  padding: 0.25rem 0.64rem;
  border-radius: 999px;
  color: var(--arc-blue);
  font-size: 0.82rem;
  font-weight: 850;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
}

.language-toggle-option:hover {
  background: rgba(182, 61, 47, 0.1);
  border-color: var(--arc-red);
  color: var(--arc-red);
}

.language-toggle-option.is-active {
  background: var(--arc-blue);
  color: #fff;
  box-shadow: 0 4px 12px rgba(36, 95, 143, 0.22);
}

.language-toggle-option.is-active:hover {
  color: #fff;
}

.navbar .language-toggle-nav {
  display: flex;
  align-items: center;
  margin-left: 0.25rem;
}

.navbar .language-toggle {
  background: rgba(255, 255, 255, 0.62);
}

.navbar .language-toggle-option {
  min-width: 42px;
  min-height: 28px;
  padding: 0.22rem 0.54rem;
  font-size: 0.78rem;
}

.lede,
.category-summary {
  max-width: 780px;
  margin: 0;
  color: var(--arc-muted);
  font-size: clamp(1.05rem, 2.4vw, 1.45rem);
  line-height: 1.5;
}

.stat-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 1.6rem;
}

.stat-strip div {
  min-height: 86px;
  padding: 1rem;
  border: 1px solid var(--arc-line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
}

.stat-strip strong {
  display: block;
  color: var(--arc-green);
  font-family: Charter, "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  font-size: clamp(1.6rem, 4vw, 2.45rem);
  line-height: 1;
}

.stat-strip span {
  display: block;
  margin-top: 0.35rem;
  color: var(--arc-muted);
  font-size: 0.86rem;
  font-weight: 700;
}

.compact-strip {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  margin: 1.8rem 0 1rem;
  border-bottom: 1px solid var(--arc-line);
}

.section-heading h2 {
  margin: 0.15rem 0 0.65rem;
}

.section-heading.compact {
  align-items: baseline;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.category-card {
  display: flex;
  min-height: 218px;
  padding: 1.1rem;
  border: 1px solid var(--arc-line);
  border-radius: 8px;
  background: var(--arc-panel);
  box-shadow: 0 8px 28px rgba(35, 31, 24, 0.06);
  color: var(--arc-ink);
  flex-direction: column;
  text-decoration: none;
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.category-card:hover {
  border-color: var(--arc-blue);
  box-shadow: var(--arc-shadow);
  color: var(--arc-ink);
  transform: translateY(-3px);
}

.category-card h3 {
  margin: 0.35rem 0 0.55rem;
  font-size: 1.35rem;
}

.category-card p {
  color: var(--arc-muted);
  line-height: 1.5;
}

.category-count {
  width: fit-content;
  padding: 0.24rem 0.5rem;
  border: 1px solid rgba(31, 122, 100, 0.28);
  border-radius: 999px;
  color: var(--arc-green);
  font-size: 0.76rem;
  font-weight: 800;
}

.note-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.15rem 0 0.85rem;
}

.note-tag {
  padding: 0.18rem 0.45rem;
  border-radius: 4px;
  background: rgba(31, 122, 100, 0.1);
  color: var(--arc-green);
  font-size: 0.72rem;
  font-weight: 700;
}

.category-foot {
  display: flex;
  gap: 0.65rem;
  margin-top: auto;
  padding-top: 0.85rem;
  border-top: 1px solid var(--arc-line);
  color: var(--arc-muted);
  font-size: 0.78rem;
  justify-content: space-between;
}

.recent-list {
  display: grid;
  gap: 0.6rem;
}

.recent-row {
  display: grid;
  align-items: center;
  grid-template-columns: 92px minmax(0, 1fr) minmax(120px, 190px);
  gap: 1rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--arc-line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.82);
  color: var(--arc-ink);
  text-decoration: none;
}

.recent-row:hover {
  border-color: var(--arc-green);
  color: var(--arc-ink);
}

.recent-row span {
  color: var(--arc-red);
  font-weight: 800;
}

.recent-row strong {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.recent-row em {
  color: var(--arc-muted);
  font-style: normal;
  text-align: right;
}

.section-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1.25rem;
}

.section-nav a,
.empty-note {
  padding: 0.38rem 0.68rem;
  border: 1px solid var(--arc-line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  color: var(--arc-ink);
  font-size: 0.84rem;
  font-weight: 750;
  text-decoration: none;
}

.section-nav a:hover {
  border-color: var(--arc-red);
  color: var(--arc-red);
}

.paper-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.paper-card {
  display: flex;
  min-height: 310px;
  padding: 1.15rem;
  border: 1px solid var(--arc-line);
  border-radius: 8px;
  background: var(--arc-panel);
  box-shadow: 0 8px 28px rgba(35, 31, 24, 0.06);
  flex-direction: column;
}

.paper-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--arc-muted);
  font-size: 0.78rem;
  font-weight: 800;
  justify-content: space-between;
}

.paper-meta span:first-child {
  color: var(--arc-red);
}

.paper-card h3 {
  margin: 0.8rem 0 0.6rem;
  font-size: 1.12rem;
  line-height: 1.25;
}

.paper-card p {
  color: var(--arc-muted);
  font-size: 0.96rem;
  line-height: 1.55;
}

.paper-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: auto;
  padding-top: 0.9rem;
}

.resource-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  min-height: 34px;
  padding: 0.32rem 0.56rem;
  border: 1px solid var(--arc-line);
  border-radius: 999px;
  background: #fff;
  color: var(--arc-ink);
  font-size: 0.82rem;
  font-weight: 800;
  text-decoration: none;
}

.resource-link:hover {
  border-color: var(--arc-blue);
  color: var(--arc-blue);
}

.resource-link img {
  width: 16px;
  height: 16px;
}

.empty-state {
  padding: 1rem;
  border: 1px dashed var(--arc-line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--arc-muted);
}

@media (max-width: 960px) {
  .category-grid,
  .paper-grid {
    grid-template-columns: 1fr;
  }

  .stat-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .home-intro,
  .category-hero,
  .section-block,
  .paper-section {
    width: min(100% - 20px, 1180px);
  }

  .home-intro,
  .category-hero {
    padding: 1.1rem;
  }

  .stat-strip,
  .compact-strip {
    grid-template-columns: 1fr;
  }

  .recent-row {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

  .recent-row strong {
    white-space: normal;
  }

  .recent-row em {
    text-align: left;
  }
}

@media (max-width: 991.98px) {
  .navbar .language-toggle-nav {
    margin: 0.35rem 0;
  }
}