/* Purdue QCASE Lab — site styles
   Palette follows Purdue brand colors (black + Boilermaker gold). */
:root {
  --black: #000000;
  --ink: #1d1d1f;
  --muted: #5b5b60;
  --line: #e4e0d6;
  --paper: #ffffff;
  --paper-alt: #f7f5f0;
  --gold: #cfb991;          /* Boilermaker Gold */
  --gold-deep: #8e6f3e;     /* Aged */
  --gold-bright: #daaa00;   /* Rush */
  --link: #7a5c1e;
  --radius: 10px;
  --max: 1120px;
  --shadow: 0 1px 2px rgba(0,0,0,.05), 0 4px 16px rgba(0,0,0,.05);
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink: #ece9e2; --muted: #a9a59c; --line: #2e2c28;
    --paper: #121212; --paper-alt: #1a1917; --link: #e2c98f;
    --shadow: 0 1px 2px rgba(0,0,0,.4);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font: 17px/1.65 "Source Sans 3", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
img { max-width: 100%; display: block; }
a { color: var(--link); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--gold-deep); }
h1, h2, h3 { font-family: "Source Serif 4", Georgia, serif; line-height: 1.25; margin: 0 0 .5em; }
h2 { font-size: 1.9rem; }
h3 { font-size: 1.2rem; margin-top: 1.8em; color: var(--ink); }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; z-index: 100; background: var(--gold); color: #000; padding: 8px 12px; }

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--black); border-bottom: 3px solid var(--gold);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: #fff; text-decoration: none; font-weight: 700; letter-spacing: .01em; }
.brand:hover { color: var(--gold); }
.brand b { color: var(--gold); }
.nav-toggle { display: none; background: none; border: 1px solid #444; color: #fff; border-radius: 6px; padding: 6px 10px; font: inherit; cursor: pointer; }
.nav ul { list-style: none; display: flex; gap: 4px; margin: 0; padding: 0; }
.nav a { color: #e9e6df; text-decoration: none; font-size: .95rem; padding: 8px 10px; border-radius: 6px; }
.nav a:hover, .nav a.active { color: #000; background: var(--gold); }

@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .nav { position: absolute; top: 67px; left: 0; right: 0; background: var(--black); display: none; border-bottom: 3px solid var(--gold); }
  .nav.open { display: block; }
  .nav ul { flex-direction: column; padding: 8px 12px 14px; }
}

/* ---------- Hero ---------- */
.hero { background: var(--black); color: #fff; padding: 48px 0 56px; }
.hero-logo { background: #fff; border-radius: var(--radius); padding: 18px 22px; max-width: 640px; margin-bottom: 28px; }
.hero-logo img { width: 100%; height: auto; }
.hero h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); color: #fff; max-width: 32ch; }
.hero h1 span { color: var(--gold); }
.hero .affil { color: #cfcac0; font-size: 1.05rem; margin: 0 0 22px; }
.hero .affil a { color: var(--gold); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; list-style: none; }
.chips li { border: 1px solid #4a463d; color: #eae4d6; border-radius: 999px; padding: 4px 12px; font-size: .9rem; }

/* ---------- Sections ---------- */
section { padding: 64px 0; border-bottom: 1px solid var(--line); }
section.alt { background: var(--paper-alt); }
.eyebrow { text-transform: uppercase; letter-spacing: .12em; font-size: .78rem; font-weight: 700; color: var(--gold-deep); margin: 0 0 6px; }
.lead { font-size: 1.12rem; }
.two-col { display: grid; grid-template-columns: 1.6fr 1fr; gap: 40px; align-items: start; }
.two-col:not(:has(> figure, > div + div)) { grid-template-columns: 1fr; }
@media (max-width: 860px) { .two-col { grid-template-columns: 1fr; } }
.figure { margin: 0; background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px; box-shadow: var(--shadow); }
.figure figcaption { font-size: .85rem; color: var(--muted); margin-top: 8px; text-align: center; }

.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; margin-top: 20px; }
.card { background: var(--paper); border: 1px solid var(--line); border-top: 3px solid var(--gold); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); }
.card h4 { margin: 0 0 6px; font-size: 1.02rem; }
.card p { margin: 0; color: var(--muted); font-size: .95rem; }

/* timeline lists (news, talks, grants) */
.timeline { list-style: none; padding: 0; margin: 0; }
.timeline li { display: grid; grid-template-columns: 150px 1fr; gap: 18px; padding: 14px 0; border-bottom: 1px dashed var(--line); }
.timeline li:last-child { border-bottom: 0; }
.timeline time, .timeline .when { font-weight: 700; color: var(--gold-deep); font-variant-numeric: tabular-nums; }
@media (max-width: 600px) { .timeline li { grid-template-columns: 1fr; gap: 2px; } }
.amount { display: inline-block; background: var(--gold); color: #000; font-weight: 700; font-size: .82rem; border-radius: 4px; padding: 1px 7px; margin-left: 4px; }

/* ---------- People ---------- */
.people { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 22px; margin-top: 16px; }
.person { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; text-align: center; box-shadow: var(--shadow); }
.person.director { display: grid; grid-template-columns: 180px 1fr; gap: 26px; text-align: left; align-items: center; max-width: 760px; }
@media (max-width: 600px) { .person.director { grid-template-columns: 1fr; text-align: center; } .person.director .avatar { margin: 0 auto; } }
.avatar {
  position: relative; width: 150px; height: 150px; margin: 0 auto 14px; border-radius: 50%; overflow: hidden;
  background: linear-gradient(135deg, var(--black), #3a352b); border: 3px solid var(--gold);
}
.person.director .avatar { width: 180px; height: 180px; margin-bottom: 0; }
.avatar::before {
  content: attr(data-initials); position: absolute; inset: 0; display: grid; place-items: center;
  color: var(--gold); font: 700 2.6rem/1 "Source Serif 4", Georgia, serif; letter-spacing: .02em;
}
.avatar img { position: relative; width: 100%; height: 100%; object-fit: cover; }
.person h4 { margin: 0 0 4px; font-size: 1.08rem; }
.person .role { margin: 0; color: var(--muted); font-size: .93rem; }
.person .since { display: inline-block; margin-top: 8px; font-size: .8rem; font-weight: 700; color: var(--gold-deep); }
.badge { display: inline-block; font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; background: var(--gold); color: #000; border-radius: 4px; padding: 2px 7px; margin-top: 8px; }
.badge.incoming { background: transparent; color: var(--gold-deep); border: 1px solid var(--gold); }
.notice { background: var(--paper); border: 1px dashed var(--gold); border-radius: var(--radius); padding: 16px 18px; margin-top: 12px; }

/* Alumni */
.alumni-intro { color: var(--muted); max-width: 70ch; }
.alumni-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 12px; margin-top: 12px; }
.alum { background: var(--paper); border: 1px solid var(--line); border-left: 3px solid var(--gold); border-radius: 8px; padding: 10px 14px; }
.alum strong { display: block; }
.alum span { color: var(--muted); font-size: .9rem; }

/* ---------- Contact / footer ---------- */
.contact-list { list-style: none; padding: 0; margin: 0; }
.contact-list li { padding: 6px 0; }
.contact-list b { display: inline-block; min-width: 150px; }
.cta { display: inline-block; background: var(--black); color: var(--gold); text-decoration: none; font-weight: 700; padding: 10px 18px; border-radius: 8px; margin-top: 8px; }
.cta:hover { background: var(--gold); color: #000; }
.links-list { columns: 2; padding-left: 1.1em; }
@media (max-width: 600px) { .links-list { columns: 1; } }
footer { background: var(--black); color: #bdb7aa; padding: 28px 0; font-size: .9rem; }
footer a { color: var(--gold); }