/* ============================================================
   Shared stylesheet — mcdeoliveira.linearcontrol.info
   Landing page uses the semantic classes (.masthead, .sec, …);
   course pages use plain markup inside .content.
   ============================================================ */

:root {
  color-scheme: light;   /* render the same light palette on every device */
  --ground: #FBF9F5;
  --surface: #FFFFFF;
  --ink: #23201C;
  --muted: #6B6459;
  --maroon: #6E1230;
  --maroon-bright: #9A2A4A;
  --rule: #E7E0D5;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* shared page container: landing uses <main>, course pages use .content */
main, .content {
  max-width: 44rem;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
}

a {
  color: var(--maroon-bright);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--maroon-bright) 35%, transparent);
}
a:hover { border-bottom-color: var(--maroon-bright); }
a:focus-visible { outline: 2px solid var(--maroon-bright); outline-offset: 2px; border-radius: 2px; }

/* ---------- Landing: masthead ---------- */
.masthead { display: grid; grid-template-columns: auto 1fr; gap: 1.75rem; align-items: center; }
.portrait {
  width: 132px; height: auto; flex: none;
  border: 1px solid var(--rule); border-radius: 4px; display: block;
}
.masthead h1 {
  font-family: var(--serif); font-weight: 500;
  font-size: clamp(1.9rem, 5vw, 2.7rem); line-height: 1.1;
  margin: 0; color: var(--maroon); text-wrap: balance;
}
.masthead .affil { margin: .5rem 0 0; color: var(--muted); font-size: .98rem; }
.contact {
  margin: 1.75rem 0 0; padding-top: 1.25rem; border-top: 1px solid var(--rule);
  display: grid; grid-template-columns: 1fr 1fr; gap: .6rem 2rem;
  font-size: .9rem; color: var(--muted);
}
.contact b { color: var(--ink); font-weight: 600; }
.contact a { border: 0; }
.contact a:hover { border-bottom: 1px solid var(--maroon-bright); }

/* ---------- Landing: sections ---------- */
section { margin-top: 3rem; }
h2.sec {
  font-family: var(--serif); font-weight: 500; font-size: 1.45rem; color: var(--ink);
  margin: 0 0 1rem; padding-bottom: .5rem; border-bottom: 1px solid var(--rule);
  display: flex; align-items: baseline; gap: .6rem;
}
h2.sec::before { content: ""; width: .55rem; height: .55rem; background: var(--maroon); flex: none; transform: translateY(-.05rem); }
h3.sub {
  font-family: var(--sans); font-weight: 700; font-size: .78rem; text-transform: uppercase;
  letter-spacing: .1em; color: var(--muted); margin: 1.75rem 0 .6rem;
}
.disclaimer {
  margin-top: 1.5rem; padding-top: 1rem; border-top: 1px solid var(--rule);
  color: var(--muted); font-size: .85rem; font-style: italic;
}

/* course listing rows (landing Teaching) */
.courses { display: flex; flex-direction: column; }
.course-row {
  display: grid; grid-template-columns: 6.5rem 1fr; gap: 1rem; align-items: baseline;
  padding: .55rem 0; border-bottom: 1px solid var(--rule);
}
.course-row:last-child { border-bottom: 0; }
.code { font-family: var(--mono); font-size: .82rem; color: var(--maroon); letter-spacing: .02em; }
.course-row .name { margin: 0; }
.course-row .name a { border: 0; }
.course-row .name a:hover { border-bottom: 1px solid var(--maroon-bright); }

.booklist { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 1.25rem; }
.booklist li { padding-left: 1rem; border-left: 2px solid var(--rule); }
.booklist .title { font-family: var(--serif); font-size: 1.1rem; color: var(--ink); }
.meta { color: var(--muted); font-size: .88rem; }
.topics { columns: 2; column-gap: 2rem; margin: 0; padding: 0 0 0 1.1rem; }
.topics li { margin-bottom: .3rem; }

/* ============================================================
   Course pages — plain markup styled inside .content
   ============================================================ */
.content h1 {
  font-family: var(--serif); font-weight: 500; line-height: 1.12;
  font-size: clamp(1.7rem, 4.5vw, 2.4rem); color: var(--maroon);
  margin: 0 0 2rem; padding-bottom: .6rem; border-bottom: 2px solid var(--rule);
  text-wrap: balance;
}
.content h2 {
  font-family: var(--serif); font-weight: 500; font-size: 1.4rem; color: var(--ink);
  margin: 2.75rem 0 1rem; padding-bottom: .45rem; border-bottom: 1px solid var(--rule);
  display: flex; align-items: baseline; gap: .55rem;
}
.content h2::before { content: ""; width: .5rem; height: .5rem; background: var(--maroon); flex: none; transform: translateY(-.05rem); }
.content h3 {
  font-family: var(--sans); font-weight: 700; font-size: 1rem; color: var(--maroon);
  margin: 1.75rem 0 .5rem;
}
.content h4 { font-family: var(--sans); font-weight: 700; font-size: .95rem; color: var(--muted); margin: 1.25rem 0 .5rem; }
.content p { margin: 0 0 1rem; }
.content ul, .content ol { margin: 0 0 1rem; padding-left: 1.4rem; }
.content ul { list-style: disc; }
.content li { margin-bottom: .4rem; }
.content li > ul, .content li > ol { margin-top: .4rem; margin-bottom: .4rem; }
.content p.title { color: var(--maroon); font-family: var(--serif); margin: 0 0 1rem; }
.content hr { border: 0; border-top: 1px solid var(--rule); margin: 2.5rem 0 0; }
.content tt, .content code {
  font-family: var(--mono); font-size: .88em;
  background: color-mix(in srgb, var(--muted) 14%, transparent);
  padding: .1em .35em; border-radius: 3px;
}
.content table { border-collapse: collapse; margin: 0 0 1rem; }
.content td { padding: .2rem 1.5rem .2rem 0; vertical-align: top; }
.content font[color="red"] { color: var(--maroon-bright) !important; }

@media (max-width: 560px) {
  .masthead { grid-template-columns: 1fr; }
  .contact { grid-template-columns: 1fr; }
  .topics { columns: 1; }
  .course-row { grid-template-columns: 5rem 1fr; gap: .75rem; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }