:root {
  --green: #0f6b4c;
  --green-dark: #0a4d38;
  --gold: #d4a017;
  --header-fg: #fff;
  --header-muted: #d9f3e8;
  --on-gold: #0a4d38;
  --ink: #12263a;
  --muted: #5b6b7a;
  --paper: #f6f3ec;
  --card: #fff;
  --line: #e4ddd0;
  --shadow: 0 12px 40px rgba(18, 38, 58, 0.08);
  --radius: 16px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: "Segoe UI", "Helvetica Neue", sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.55;
}
img { max-width: 100%; }
a { color: var(--green-dark); }
.container {
  width: min(1120px, calc(100% - 32px));
  margin-inline: auto;
}
.skip-link {
  position: absolute;
  left: -999px;
  background: var(--gold);
  padding: 8px 12px;
}
.skip-link:focus { left: 12px; top: 12px; }

.site-header {
  background: var(--green);
  color: var(--header-fg);
  position: sticky;
  top: 0;
  z-index: 20;
}
.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 72px;
  flex-wrap: wrap;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--header-fg);
  text-decoration: none;
}
.brand small { display: block; color: var(--header-muted); font-size: 0.8rem; }
.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--gold);
  color: var(--on-gold);
  display: grid;
  place-items: center;
  font-weight: 800;
}
.nav-toggle {
  display: none;
  background: transparent;
  color: var(--header-fg);
  border: 1px solid color-mix(in srgb, var(--header-fg) 35%, transparent);
  border-radius: 8px;
  padding: 8px 12px;
}
.site-nav { display: flex; gap: 8px; flex-wrap: wrap; }
.site-nav a {
  color: var(--header-fg);
  text-decoration: none;
  padding: 8px 12px;
  border-radius: 999px;
}
.site-nav a.active,
.site-nav a:hover { background: rgba(255,255,255,0.14); }

.hero, .page-hero {
  padding: 56px 0 32px;
  background:
    radial-gradient(circle at top right, color-mix(in srgb, var(--gold) 18%, transparent), transparent 32%),
    linear-gradient(#fff, var(--paper));
}
.hero-grid, .detail-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr;
  gap: 28px;
  align-items: start;
}
h1 { font-size: clamp(2rem, 5vw, 3.4rem); line-height: 1.1; margin: 8px 0 12px; }
h2 { margin-top: 0; }
.lead { font-size: 1.15rem; color: var(--muted); max-width: 42rem; }
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--green);
  margin: 0;
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 24px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 18px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 700;
  border: 0;
  cursor: pointer;
}
.button.primary { background: var(--green); color: var(--header-fg); }
.button.ghost { background: transparent; color: var(--green-dark); border: 1px solid var(--line); }
.hero-card, .subject-card, .paper-card, .detail-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
}
.stat { font-size: 3rem; font-weight: 800; margin: 0; color: var(--green); }
.section { padding: 24px 0 64px; }
.section-head { margin-bottom: 20px; }
.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.subject-card { text-decoration: none; color: inherit; display: block; }
.subject-card span { color: var(--green); font-weight: 700; }
.filters {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr)) auto;
  gap: 12px;
  align-items: end;
  margin-bottom: 20px;
}
.filters label { display: grid; gap: 6px; font-size: 0.9rem; font-weight: 600; }
.filters input, .filters select {
  width: 100%;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
  font: inherit;
}
.paper-list { display: grid; gap: 12px; }
.paper-card {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}
.paper-card h2 { font-size: 1.2rem; margin: 0 0 4px; }
.paper-card h2 a { text-decoration: none; color: inherit; }
.meta, .result-count, .fine-print, .empty { color: var(--muted); }
.pager { display: flex; gap: 12px; margin-top: 20px; }
.detail-card dl { display: grid; gap: 10px; }
.detail-card div { display: grid; grid-template-columns: 120px 1fr; gap: 8px; }
dt { color: var(--muted); font-weight: 600; }
dd { margin: 0; }
.prose { max-width: 44rem; }
.prose ol { padding-left: 1.2rem; }
code { background: #fff; padding: 2px 6px; border-radius: 6px; }
.site-footer {
  background: var(--green-dark);
  color: var(--header-muted);
  padding: 36px 0 24px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 24px;
}
.site-footer a { display: block; color: var(--header-fg); margin: 6px 0; text-decoration: none; }

.theme-picker {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.theme-picker-label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--header-muted);
}
.theme-swatches { display: flex; gap: 6px; }
.theme-swatch,
.theme-picker input[type="color"] {
  width: 24px;
  height: 24px;
  padding: 0;
  border-radius: 999px;
  border: 2px solid color-mix(in srgb, var(--header-fg) 55%, transparent);
  background: none;
  cursor: pointer;
}
.theme-picker input[type="color"] {
  width: 32px;
  height: 28px;
  border-radius: 8px;
}
.theme-reset {
  background: transparent;
  color: var(--header-fg);
  border: 1px solid color-mix(in srgb, var(--header-fg) 35%, transparent);
  border-radius: 8px;
  padding: 6px 10px;
  font: inherit;
  cursor: pointer;
}

@media (max-width: 860px) {
  .hero-grid, .detail-grid, .card-grid, .footer-grid, .filters {
    grid-template-columns: 1fr;
  }
  .nav-toggle { display: inline-flex; }
  .site-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    padding-bottom: 16px;
  }
  .site-nav.open { display: flex; }
  .paper-card { flex-direction: column; align-items: flex-start; }
  .hero, .page-hero { padding-top: 32px; }
}

@media (max-width: 480px) {
  h1 { font-size: 2rem; }
  .container { width: min(1120px, calc(100% - 24px)); }
  .theme-swatches { display: none; }
}