:root {
  --ink: #16213a;
  --muted: #5d6980;
  --paper: #f7f8fb;
  --panel: #ffffff;
  --line: #dce2ec;
  --accent: #275dad;
  --accent-soft: #eaf1fb;
  --signal: #147d70;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--paper);
}

* { box-sizing: border-box; }
body { margin: 0; line-height: 1.65; }
a { color: var(--accent); }
.wrap { width: min(1100px, calc(100% - 2rem)); margin: 0 auto; }
header { background: rgba(255,255,255,.96); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 10; }
nav { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.brand { color: var(--ink); font-weight: 800; text-decoration: none; letter-spacing: -.02em; }
.nav-links { display: flex; flex-wrap: wrap; gap: .9rem; }
.nav-links a { color: var(--muted); text-decoration: none; font-size: .92rem; }
.nav-links a:hover { color: var(--accent); }
.hero { padding: 6rem 0 4.5rem; background: radial-gradient(circle at 82% 18%, #cfe3ff 0, transparent 34%), linear-gradient(135deg, #f8fbff, #eef3f9); }
.eyebrow { color: var(--signal); font-size: .78rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
h1 { max-width: 850px; margin: .5rem 0 1rem; font-size: clamp(2.5rem, 6vw, 5.3rem); line-height: 1.03; letter-spacing: -.055em; }
.lead { max-width: 760px; color: var(--muted); font-size: 1.2rem; }
.actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 1.8rem; }
.button { display: inline-block; padding: .72rem 1rem; border-radius: .65rem; background: var(--accent); color: white; text-decoration: none; font-weight: 700; }
.button.secondary { background: var(--panel); color: var(--accent); border: 1px solid var(--line); }
main section, .page { padding: 4rem 0; }
.page h1 { font-size: clamp(2.3rem, 5vw, 4rem); }
.section-head { max-width: 720px; margin-bottom: 2rem; }
.section-head h2 { margin: .25rem 0; font-size: clamp(1.8rem, 4vw, 2.7rem); letter-spacing: -.03em; }
.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 1rem; padding: 1.4rem; }
.card h2, .card h3 { margin-top: 0; }
.card p { color: var(--muted); }
.tag { display: inline-block; margin: .2rem .25rem .2rem 0; padding: .2rem .55rem; border-radius: 999px; background: var(--accent-soft); color: var(--accent); font-size: .78rem; font-weight: 700; }
.note { margin-top: 2rem; border-left: 4px solid var(--signal); padding: 1rem 1.25rem; background: #edf8f5; }
footer { padding: 2rem 0; color: var(--muted); border-top: 1px solid var(--line); }
.course-hero { padding: 6.5rem 0 4.5rem; background: radial-gradient(circle at 80% 20%, #d8e9ff 0, transparent 33%), linear-gradient(135deg, #f8fbff, #eaf0f7); }
.course-hero h1 { margin-bottom: 1rem; }
.slogan { max-width: 900px; font-size: clamp(1.25rem, 2.5vw, 1.75rem); font-weight: 650; line-height: 1.35; color: #284766; letter-spacing: -.015em; }
.course-meta { display: grid; grid-template-columns: minmax(0, 2fr) minmax(10rem, .75fr) minmax(16rem, 1.25fr); gap: 1.5rem 3rem; max-width: 1100px; margin-top: 2.5rem; padding-top: 1.4rem; border-top: 1px solid rgba(39,93,173,.2); }
.course-meta span { min-width: 0; color: var(--muted); font-size: 1rem; line-height: 1.45; }
.course-meta strong { display: block; min-width: 0; margin-bottom: .25rem; color: var(--accent); font-size: .72rem; font-weight: 800; letter-spacing: .1em; line-height: 1.2; text-transform: uppercase; }
.course-content { padding: 3rem 0 5rem; max-width: 980px; }
.course-content h2 { margin: 3.5rem 0 1rem; padding-top: 1rem; font-size: clamp(1.8rem, 3vw, 2.45rem); line-height: 1.15; letter-spacing: -.03em; }
.course-content h3 { margin: 2rem 0 .6rem; font-size: 1.25rem; }
.course-content p, .course-content li { color: #334057; }
.course-content li { margin-bottom: .55rem; }
.course-content table { width: 100%; margin: 1.2rem 0 1.8rem; border-collapse: collapse; background: var(--panel); border: 1px solid var(--line); font-size: .92rem; }
.course-content th { background: #1c476c; color: white; text-align: left; }
.course-content th, .course-content td { padding: .72rem .8rem; border: 1px solid var(--line); vertical-align: top; }
.course-content tbody tr:nth-child(even) { background: #f2f6fa; }
.course-content blockquote { margin: 1.3rem 0; padding: .9rem 1.1rem; border-left: 4px solid #d59d24; background: #fff8e8; color: #68521f; }
.course-content blockquote p { margin: 0; color: inherit; }
.closing-note { margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--line); font-style: italic; }
.nav-links a[aria-current="page"] { color: var(--accent); font-weight: 750; }
.projects-hero { padding: 5.5rem 0 4rem; background: radial-gradient(circle at 85% 12%, #d7e9ff 0, transparent 31%), linear-gradient(135deg, #f8fbff, #edf3f9); border-bottom: 1px solid var(--line); }
.projects-hero h1 { margin-bottom: 1rem; }
.projects-content { max-width: 980px; padding: 4rem 0 5.5rem; }
.project-intro { display: grid; grid-template-columns: minmax(15rem, .75fr) minmax(0, 1.5fr); gap: 2rem 4rem; padding: 0 0 3.5rem; border-bottom: 1px solid var(--line); }
.project-intro h2 { margin: .25rem 0 0; font-size: clamp(1.8rem, 3vw, 2.45rem); line-height: 1.15; letter-spacing: -.03em; }
.project-intro p { margin-top: 0; color: #334057; }
.section-kicker { margin: 0; color: var(--signal); font-size: .75rem; font-weight: 800; letter-spacing: .11em; text-transform: uppercase; }
.project-brief { margin-top: 3rem; overflow: hidden; background: var(--panel); border: 1px solid var(--line); border-radius: 1rem; box-shadow: 0 12px 30px rgba(22, 33, 58, .045); }
.project-brief-heading { display: grid; grid-template-columns: 3.4rem minmax(0, 1fr) auto; gap: 1rem; align-items: center; padding: 1.7rem 1.8rem 1.5rem; background: linear-gradient(135deg, #f8fbff, #eef4fb); cursor: pointer; list-style: none; }
.project-brief-heading::-webkit-details-marker { display: none; }
.project-brief-heading:hover { background: linear-gradient(135deg, #f4f9ff, #e7f0fa); }
.project-brief-heading:focus-visible { outline: 3px solid rgba(39,93,173,.35); outline-offset: -3px; }
.project-brief[open] .project-brief-heading { border-bottom: 1px solid var(--line); }
.project-number { color: #9aabc0; font-size: 1.65rem; font-weight: 800; line-height: 1; letter-spacing: -.04em; }
.project-brief h2 { max-width: 800px; margin: 0; font-size: clamp(1.45rem, 2.8vw, 2rem); line-height: 1.22; letter-spacing: -.028em; }
.organization { margin: .9rem 0 0; color: var(--ink); font-weight: 700; }
.organization span { margin-right: .55rem; color: var(--accent); font-size: .7rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.project-toggle { min-width: 6rem; color: var(--accent); font-size: .75rem; font-weight: 800; letter-spacing: .04em; text-align: right; text-transform: uppercase; }
.project-toggle::before { content: "View details  +"; }
.project-brief[open] .project-toggle::before { content: "Hide details  −"; }
.project-body { padding: .3rem 1.8rem 1.7rem 5.2rem; }
.project-body section { padding: 1.25rem 0; border-bottom: 1px solid var(--line); }
.project-body section:last-child { border-bottom: 0; }
.project-body h3 { margin: 0 0 .55rem; color: var(--ink); font-size: .78rem; letter-spacing: .1em; text-transform: uppercase; }
.project-body p { max-width: 840px; margin: 0; color: #3f4c62; }
@media (max-width: 760px) {
  nav { align-items: flex-start; flex-direction: column; padding: 1rem 0; }
  .grid { grid-template-columns: 1fr; }
  .hero { padding-top: 4rem; }
  .course-hero { padding: 4rem 0 3rem; }
  .course-meta { grid-template-columns: 1fr; }
  .course-content table { display: block; overflow-x: auto; white-space: normal; }
  .projects-hero { padding: 4rem 0 3rem; }
  .projects-content { padding-top: 3rem; }
  .project-intro { grid-template-columns: 1fr; }
  .project-brief-heading { grid-template-columns: 2.5rem minmax(0, 1fr); padding: 1.25rem; }
  .project-toggle { grid-column: 2; min-width: 0; text-align: left; }
  .project-body { padding: .2rem 1.25rem 1.1rem; }
  .organization span { display: block; margin-bottom: .15rem; }
}