/* HDDA Task Force — academic, quiet, readable. */

:root {
  --paper: #fbfaf6;
  --paper-2: #f3f0e7;
  --ink: #1b2230;
  --ink-2: #4a5468;
  --ink-3: #6f788a;
  --rule: #e3dfd3;
  --accent: #1f3a68;       /* deep academic navy */
  --accent-2: #b0472b;     /* oxide red for highlights */
  --accent-soft: #e6ebf3;
  --dot-a: #1f3a68;
  --dot-b: #b0472b;
  --serif: "Source Serif 4", "Iowan Old Style", Georgia, serif;
  --sans: "Source Sans 3", -apple-system, "Segoe UI", Roboto, sans-serif;
  --measure: 42rem;
  --wide: 70rem;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #12161e; --paper-2: #191f2a; --ink: #e7e9ee; --ink-2: #b4bccb; --ink-3: #8b94a6;
    --rule: #2a3242; --accent: #9db8ea; --accent-2: #e79a7f; --accent-soft: #1e2840;
    --dot-a: #9db8ea; --dot-b: #e79a7f; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #12161e; --paper-2: #191f2a; --ink: #e7e9ee; --ink-2: #b4bccb; --ink-3: #8b94a6;
  --rule: #2a3242; --accent: #9db8ea; --accent-2: #e79a7f; --accent-soft: #1e2840;
  --dot-a: #9db8ea; --dot-b: #e79a7f; color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1.0625rem/1.65 var(--sans);
  display: flex; flex-direction: column; min-height: 100vh;
}
main { flex: 1; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { color: var(--accent-2); }
h1, h2, h3, h4 { font-family: var(--serif); font-weight: 600; line-height: 1.2; color: var(--ink); text-wrap: balance; }
img { max-width: 100%; height: auto; }

.skip { position: absolute; left: -999px; }
.skip:focus { left: 1rem; top: 1rem; background: var(--paper); padding: .5rem 1rem; z-index: 10; }

.wrap { max-width: var(--wide); margin: 0 auto; padding: 0 1rem; }
@media (min-width: 640px) { .wrap { padding: 0 1.5rem; } }
.narrow { max-width: calc(var(--measure) + 3rem); }

/* ---------- header ---------- */
.site-header { border-bottom: 1px solid var(--rule); background: var(--paper); }
.header-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .75rem 2rem; padding-top: 1rem; padding-bottom: 1rem; }
.brand { display: flex; align-items: center; gap: .75rem; text-decoration: none; color: var(--ink); }
.brand:hover { color: var(--ink); }
.brand-mark {
  width: 2.25rem; height: 2.25rem; border-radius: .5rem; flex: none;
  background:
    radial-gradient(circle at 28% 70%, var(--paper) 0 2.6px, transparent 3px),
    radial-gradient(circle at 45% 46%, var(--paper) 0 2.6px, transparent 3px),
    radial-gradient(circle at 64% 33%, var(--paper) 0 2.6px, transparent 3px),
    radial-gradient(circle at 76% 58%, color-mix(in srgb, var(--paper) 60%, transparent) 0 2.6px, transparent 3px),
    var(--accent);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-kicker { font-size: .72rem; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
.brand-name { font-family: var(--serif); font-weight: 600; font-size: 1.12rem; }
.site-nav { display: flex; flex-wrap: wrap; gap: .25rem 1.25rem; }
.site-nav a { color: var(--ink-2); text-decoration: none; font-weight: 600; font-size: .98rem; padding: .25rem 0; border-bottom: 2px solid transparent; }
.site-nav a:hover { color: var(--accent); }
.site-nav a[aria-current="page"] { color: var(--accent); border-bottom-color: var(--accent-2); }

/* ---------- hero ---------- */
.hero { background: linear-gradient(180deg, var(--paper-2), var(--paper)); border-bottom: 1px solid var(--rule); }
.hero-inner { display: grid; gap: 1.5rem; align-items: center; padding-top: 2.5rem; padding-bottom: 2.5rem; }
@media (min-width: 860px) { .hero-inner { grid-template-columns: 1.15fr 1fr; padding-top: 4rem; padding-bottom: 4rem; } }
.hero h1 { font-size: clamp(2.1rem, 5vw, 3.3rem); margin: .25rem 0 1rem; letter-spacing: -.01em; }
.hero .lead { max-width: 36rem; }
.hero-art { max-width: 30rem; width: 100%; justify-self: center; }
.manifold { width: 100%; height: auto; display: block; }
.manifold .a { fill: var(--dot-a); }
.manifold .b { fill: var(--dot-b); }

.kicker { margin: 0; font-size: .78rem; letter-spacing: .14em; text-transform: uppercase; color: var(--accent-2); font-weight: 600; }
.kicker a { color: inherit; text-decoration: none; }
.lead { font-size: 1.18rem; color: var(--ink-2); margin: 0; }
.actions { display: flex; flex-wrap: wrap; gap: .75rem; margin: 1.75rem 0 0; }
.btn { display: inline-block; padding: .6rem 1.15rem; border-radius: .4rem; background: var(--accent); color: var(--paper); text-decoration: none; font-weight: 600; border: 1px solid var(--accent); }
.btn:hover { background: var(--accent-2); border-color: var(--accent-2); color: var(--paper); }
.btn.ghost { background: transparent; color: var(--accent); }
.btn.ghost:hover { color: var(--accent-2); background: transparent; }

/* ---------- home ---------- */
.home-grid { display: grid; gap: 2.5rem; padding-top: 2.5rem; padding-bottom: 3.5rem; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; border-bottom: 1px solid var(--rule); margin-bottom: .5rem; }
.section-head h2 { margin: 0 0 .5rem; font-size: 1.5rem; }
.section-head a { font-weight: 600; text-decoration: none; white-space: nowrap; }

.news-list { list-style: none; margin: 0; padding: 0; }
.news-list li { padding: 1rem 0; border-bottom: 1px solid var(--rule); display: grid; grid-template-columns: 5.5rem 1fr; column-gap: 1rem; }
.news-list time { color: var(--ink-3); font-size: .9rem; font-variant-numeric: tabular-nums; padding-top: .15rem; }
.news-list a { font-family: var(--serif); font-weight: 600; font-size: 1.12rem; text-decoration: none; color: var(--ink); line-height: 1.35; }
.news-list a:hover { color: var(--accent); text-decoration: underline; }
.news-list p { grid-column: 2; margin: .3rem 0 0; color: var(--ink-2); font-size: .97rem; }
@media (max-width: 480px) { .news-list li { grid-template-columns: 1fr; } .news-list p { grid-column: 1; } }

/* home: news as a full-width card grid */
.news-cards { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fill, minmax(18rem, 1fr)); margin-top: 1.25rem; }
.news-cards li { display: flex; flex-direction: column; gap: .5rem; padding: 1.2rem 1.35rem; border: 1px solid var(--rule); border-left: 3px solid var(--accent); border-radius: .5rem; background: var(--paper-2); }
.news-cards li:hover { border-left-color: var(--accent-2); }
.news-cards time { padding: 0; font-size: .8rem; letter-spacing: .1em; text-transform: uppercase; }
.news-cards a { font-size: 1.15rem; }
.news-cards a::after { content: ""; position: absolute; inset: 0; }
.news-cards li { position: relative; }


/* ---------- pages ---------- */
.page { padding-top: 2.75rem; padding-bottom: 4rem; }
.page-head { margin-bottom: 2rem; padding-bottom: 1.5rem; border-bottom: 1px solid var(--rule); }
.page-head h1 { font-size: clamp(1.9rem, 4.2vw, 2.6rem); margin: .35rem 0 .6rem; }
.prose { max-width: var(--measure); }
.prose h2 { font-size: 1.5rem; margin: 2.2rem 0 .6rem; }
.prose h3 { font-size: 1.25rem; margin: 1.8rem 0 .5rem; }
.prose h4 { font-size: 1.1rem; margin: 1.5rem 0 .4rem; }
.prose ul, .prose ol { padding-left: 1.3rem; }
.prose li { margin: .35rem 0; }
.prose li::marker { color: var(--accent-2); }
.prose blockquote { margin: 1.5rem 0; padding: .25rem 1.25rem; border-left: 3px solid var(--accent-2); color: var(--ink-2); }
.prose a { overflow-wrap: anywhere; }
.prose table { border-collapse: collapse; width: 100%; display: block; overflow-x: auto; }
.prose th, .prose td { border-bottom: 1px solid var(--rule); padding: .5rem .75rem; text-align: left; }

.year h2 { font-size: 1.3rem; margin: 2rem 0 0; color: var(--accent); }
.year:first-of-type h2 { margin-top: 0; }

.tags { list-style: none; padding: 0; margin: 2.5rem 0 0; display: flex; flex-wrap: wrap; gap: .5rem; }
.tags li { font-size: .85rem; padding: .15rem .65rem; border-radius: 999px; background: var(--accent-soft); color: var(--accent); }
.post-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--rule); }
.post-nav a { text-decoration: none; font-family: var(--serif); font-weight: 600; line-height: 1.35; }
.post-nav span { display: block; font-family: var(--sans); font-size: .78rem; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); font-weight: 400; margin-bottom: .2rem; }
.post-nav .next { text-align: right; grid-column: 2; }

/* ---------- members ---------- */
.member-grid { list-style: none; margin: 0; padding: 0; display: grid; gap: 1rem; grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr)); }
.member a { display: flex; flex-direction: column; gap: .2rem; height: 100%; padding: 1.1rem 1.25rem; border: 1px solid var(--rule); border-radius: .6rem; background: var(--paper); text-decoration: none; color: var(--ink); border-top: 3px solid var(--accent); transition: border-color .15s, transform .15s; }
.member a:hover { border-top-color: var(--accent-2); transform: translateY(-2px); color: var(--ink); }
.member-name { font-family: var(--serif); font-weight: 600; font-size: 1.15rem; }
.member-inst { color: var(--ink-2); font-size: .95rem; }
.member-country { color: var(--ink-3); font-size: .85rem; letter-spacing: .04em; text-transform: uppercase; margin-top: auto; padding-top: .4rem; }
.badge { align-self: flex-start; font-size: .75rem; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--accent-2); }

.facts { display: grid; grid-template-columns: 9rem 1fr; gap: .1rem 1.5rem; margin: 0; max-width: var(--measure); }
.facts dt { color: var(--ink-3); font-size: .9rem; padding: .6rem 0; border-bottom: 1px solid var(--rule); }
.facts dd { margin: 0; padding: .6rem 0; border-bottom: 1px solid var(--rule); overflow-wrap: anywhere; }
@media (max-width: 480px) { .facts { grid-template-columns: 1fr; } .facts dt { border: 0; padding-bottom: 0; } }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--rule); background: var(--paper-2); color: var(--ink-2); font-size: .93rem; }
.footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem 2rem; padding-top: 1.75rem; padding-bottom: 1.75rem; }
.footer-inner p { margin: 0 0 .25rem; }
.footer-title { font-family: var(--serif); font-weight: 600; color: var(--ink); }
.footer-links { display: flex; flex-wrap: wrap; gap: .5rem 1.25rem; align-items: flex-start; }
.footer-links a { color: var(--ink-2); }

/* about: leadership */
.leaders { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fill, minmax(16rem, 1fr)); margin: 1rem 0 1.5rem; }
.leader { display: flex; flex-direction: column; gap: .2rem; padding: 1.1rem 1.25rem; border: 1px solid var(--rule); border-top: 3px solid var(--accent-2); border-radius: .6rem; background: var(--paper-2); text-decoration: none; color: var(--ink); }
.leader:hover { color: var(--ink); border-top-color: var(--accent); }
.prose .former { list-style: none; padding: 0; margin: .5rem 0 0; }
.former li { display: flex; flex-wrap: wrap; gap: .25rem .75rem; align-items: baseline; padding: .55rem 0; border-bottom: 1px solid var(--rule); }
.former li::marker { content: none; }
.former a { font-weight: 600; text-decoration: none; }
.former span { color: var(--ink-3); font-size: .95rem; }