:root {
  --bg: #f7f5f1;
  --surface: #ffffff;
  --ink: #1c2430;
  --muted: #5a6573;
  --line: #e4ddd2;
  --accent: #1f4e6b;
  --accent-soft: #e8f0f5;
  --warm: #8b5a2b;
  --ok: #2d6a4f;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(28,36,48,.06), 0 8px 24px rgba(28,36,48,.06);
  --max: 860px;
  --wide: 1100px;
  --font: "Source Serif 4", "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: "IBM Plex Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  font-size: 1.02rem;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--warm); }
h1, h2, h3, h4 {
  font-family: var(--font);
  line-height: 1.25;
  font-weight: 600;
  color: var(--ink);
  margin: 1.4em 0 .5em;
}
h1 { font-size: clamp(1.7rem, 4vw, 2.35rem); margin-top: 0; }
h2 { font-size: clamp(1.3rem, 2.5vw, 1.65rem); border-bottom: 1px solid var(--line); padding-bottom: .35em; }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1em; }
ul, ol { margin: 0 0 1.1em; padding-left: 1.3em; }
li { margin-bottom: .35em; }
code { font-size: .92em; background: var(--accent-soft); padding: .1em .35em; border-radius: 4px; }

.skip {
  position: absolute; left: -9999px; top: auto;
}
.skip:focus {
  left: 1rem; top: 1rem; z-index: 100;
  background: var(--surface); padding: .5rem 1rem; border-radius: 6px;
}

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 50;
  box-shadow: 0 1px 0 rgba(28,36,48,.04);
}
.header-inner {
  max-width: var(--wide);
  margin: 0 auto;
  padding: .75rem 1.25rem;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  flex-wrap: wrap;
}
.brand {
  display: flex; flex-direction: column; gap: .1rem;
  text-decoration: none; color: inherit;
}
.brand-code { font-weight: 700; letter-spacing: .02em; color: var(--accent); font-size: .95rem; }
.brand-title { font-size: .8rem; color: var(--muted); }

.nav-toggle {
  display: none;
  background: var(--accent-soft); border: 1px solid var(--line);
  border-radius: 8px; padding: .45rem .75rem; font: inherit; cursor: pointer; color: var(--accent);
}
.site-nav { display: flex; flex-wrap: wrap; gap: .15rem .85rem; align-items: center; }
.site-nav a {
  text-decoration: none; color: var(--muted); font-size: .9rem; font-weight: 500;
  padding: .25rem 0;
}
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--accent); }

.hero {
  background: linear-gradient(145deg, #1f4e6b 0%, #2a6280 55%, #3a6f5c 100%);
  color: #f5f8fb;
  padding: 2.5rem 1.25rem 2.75rem;
}
.hero-inner { max-width: var(--wide); margin: 0 auto; }
.hero h1 { color: #fff; margin-bottom: .4em; }
.hero p { color: rgba(255,255,255,.88); max-width: 40rem; font-size: 1.05rem; }
.hero-meta {
  display: flex; flex-wrap: wrap; gap: .5rem;
  margin-top: 1.25rem;
}
.pill {
  display: inline-block;
  background: rgba(255,255,255,.14);
  border: 1px solid rgba(255,255,255,.22);
  color: #fff;
  padding: .3rem .7rem;
  border-radius: 999px;
  font-size: .8rem;
  font-weight: 500;
}
.pill a { color: #fff; }

.layout {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 1.75rem 1.25rem 3rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
.layout.with-aside {
  grid-template-columns: minmax(0, 1fr) 260px;
}
@media (max-width: 880px) {
  .layout.with-aside { grid-template-columns: 1fr; }
  .aside { order: -1; }
}
.main-card, .aside-card, .card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem 1.6rem;
}
.prose { max-width: var(--max); }
.prose > :first-child { margin-top: 0; }

.aside { display: flex; flex-direction: column; gap: 1rem; }
.aside h2 { font-size: 1rem; margin: 0 0 .75rem; border: none; padding: 0; }
.aside ol, .aside ul { margin: 0; padding-left: 1.1em; font-size: .9rem; }
.aside a { text-decoration: none; }
.aside a:hover { text-decoration: underline; }

.week-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: .85rem;
  margin: 1.25rem 0;
}
.week-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  text-decoration: none;
  color: inherit;
  transition: border-color .15s, box-shadow .15s;
  display: block;
}
.week-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow);
  color: inherit;
}
.week-card .wk { color: var(--accent); font-weight: 700; font-size: .8rem; letter-spacing: .04em; text-transform: uppercase; }
.week-card h3 { margin: .35rem 0 .4rem; font-size: 1.05rem; border: none; padding: 0; }
.week-card p { margin: 0; font-size: .88rem; color: var(--muted); }

.callout {
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
  padding: .9rem 1.1rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1.2rem 0;
}
.callout.pakistan { border-left-color: var(--ok); background: #eef6f1; }
.callout strong { display: block; margin-bottom: .25rem; font-size: .85rem; text-transform: uppercase; letter-spacing: .04em; color: var(--accent); }
.callout.pakistan strong { color: var(--ok); }

.term-list dt { font-weight: 600; margin-top: .7em; }
.term-list dd { margin: .15em 0 0; color: var(--muted); }

.self-check {
  background: #faf7f0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  margin: 1.25rem 0;
}
.self-check h3 { margin-top: 0; border: none; }
.self-check ol { margin-bottom: 0; }

.week-nav {
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  margin-top: 2rem; padding-top: 1.25rem; border-top: 1px solid var(--line);
}
.week-nav a {
  text-decoration: none;
  background: var(--accent-soft);
  color: var(--accent);
  padding: .55rem 1rem;
  border-radius: 8px;
  font-size: .9rem; font-weight: 500;
}
.week-nav a:hover { background: #d7e6ef; }

.meta-row {
  display: flex; flex-wrap: wrap; gap: .5rem .85rem;
  font-size: .88rem; color: var(--muted); margin-bottom: 1.25rem;
}
.meta-row span::before { content: "· "; color: var(--line); }
.meta-row span:first-child::before { content: none; }

.peer-table { width: 100%; border-collapse: collapse; font-size: .92rem; }
.peer-table th, .peer-table td {
  text-align: left; padding: .7rem .55rem; border-bottom: 1px solid var(--line); vertical-align: top;
}
.peer-table th { font-size: .78rem; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
.peer-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.1rem 1.2rem;
  margin-bottom: .85rem;
  background: var(--surface);
}
.peer-card h3 { margin: 0 0 .35rem; border: none; font-size: 1.05rem; }
.peer-card .inst { color: var(--muted); font-size: .88rem; margin-bottom: .5rem; }
.peer-card .align { font-size: .92rem; margin: .5rem 0 0; }

.syllabus-fig {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
  margin: 1rem 0 1.5rem;
}
.syllabus-fig img { width: 100%; }

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
  padding: 1.75rem 1.25rem 2.5rem;
  color: var(--muted);
  font-size: .88rem;
}
.footer-inner { max-width: var(--wide); margin: 0 auto; }
.footer-inner a { color: var(--accent); }
.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}
.footer-grid h2 { font-size: .85rem; text-transform: uppercase; letter-spacing: .05em; color: var(--ink); margin: 0 0 .5rem; border: none; padding: 0; }
.footer-grid ul { list-style: none; padding: 0; margin: 0; }
.footer-grid li { margin-bottom: .3rem; }

.objectives {
  background: #faf7f0;
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  margin: 1rem 0 1.4rem;
  border: 1px solid var(--line);
}
.objectives h2 { margin-top: 0; border: none; font-size: 1.05rem; padding: 0; }

@media (max-width: 720px) {
  .nav-toggle { display: inline-block; }
  .site-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: .35rem;
    padding-bottom: .5rem;
  }
  .site-nav.open { display: flex; }
  .main-card, .aside-card, .card { padding: 1.15rem 1.1rem; }
}