/* Qi Wang Research Lab — shared styles. Self-contained, no dependencies. */
:root {
  --sdsu-red: #A6192E;
  --sdsu-red-dark: #7f1222;
  --ink: #1a1c20;
  --muted: #565b63;
  --line: #e5e7eb;
  --bg: #ffffff;
  --bg-alt: #f6f7f9;
  --card: #ffffff;
  --accent-soft: #fbeaed;
  --maxw: 1080px;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(16,18,20,.04), 0 8px 24px rgba(16,18,20,.06);
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e9eaec; --muted: #a3a9b3; --line: #2a2e35;
    --bg: #14161a; --bg-alt: #1a1d22; --card: #1c1f25;
    --accent-soft: #331319; --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35);
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; color: var(--ink); background: var(--bg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 { font-family: Georgia, "Times New Roman", serif; line-height: 1.2; color: var(--ink); }
a { color: var(--sdsu-red); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }

/* ---- Header / nav ---- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--ink); font-size: 1.05rem; }
.brand:hover { text-decoration: none; }
.brand .mark {
  width: 30px; height: 30px; border-radius: 7px; background: var(--sdsu-red);
  color: #fff; display: grid; place-items: center; font-family: Georgia, serif; font-weight: 700; font-size: .95rem;
}
.brand .sub { color: var(--muted); font-weight: 500; font-size: .82rem; display: block; margin-top: -3px; }
.menu { display: flex; gap: 4px; list-style: none; margin: 0; padding: 0; align-items: center; }
.menu a {
  color: var(--ink); padding: 8px 12px; border-radius: 8px; font-size: .92rem; font-weight: 500;
}
.menu a:hover { background: var(--bg-alt); text-decoration: none; }
.menu a.active { color: var(--sdsu-red); background: var(--accent-soft); }
.menu a.cta { color: #fff; background: var(--sdsu-red); }
.menu a.cta:hover { background: var(--sdsu-red-dark); }
.nav-toggle { display: none; background: none; border: 1px solid var(--line); border-radius: 8px;
  padding: 7px 10px; cursor: pointer; color: var(--ink); font-size: 1.1rem; }
@media (max-width: 820px) {
  .nav-toggle { display: block; }
  .menu {
    position: absolute; top: 64px; left: 0; right: 0; flex-direction: column; align-items: stretch;
    background: var(--bg); border-bottom: 1px solid var(--line); padding: 8px 14px 16px; gap: 2px;
    display: none;
  }
  .menu.open { display: flex; }
  .menu a { padding: 11px 12px; }
}

/* ---- Hero ---- */
.hero { padding: 76px 0 56px; background:
  radial-gradient(1200px 400px at 80% -10%, var(--accent-soft), transparent 60%); }
.hero .eyebrow { color: var(--sdsu-red); font-weight: 700; letter-spacing: .06em; text-transform: uppercase; font-size: .78rem; }
.hero h1 { font-size: clamp(2rem, 4.5vw, 3.1rem); margin: 12px 0 10px; }
.hero p.lede { font-size: 1.18rem; color: var(--muted); max-width: 60ch; margin: 0 0 26px; }
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-block; padding: 11px 20px; border-radius: 10px; font-weight: 600; font-size: .95rem;
  background: var(--sdsu-red); color: #fff; border: 1px solid transparent;
}
.btn:hover { background: var(--sdsu-red-dark); text-decoration: none; }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn.ghost:hover { background: var(--bg-alt); }

/* ---- Sections ---- */
section.block { padding: 54px 0; }
section.block.alt { background: var(--bg-alt); }
.section-head { max-width: 62ch; margin-bottom: 30px; }
.section-head .eyebrow { color: var(--sdsu-red); font-weight: 700; letter-spacing: .05em; text-transform: uppercase; font-size: .76rem; }
.section-head h2 { font-size: clamp(1.6rem, 3vw, 2.1rem); margin: 8px 0 8px; }
.section-head p { color: var(--muted); margin: 0; }

/* ---- Grid + cards ---- */
.grid { display: grid; gap: 18px; }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 820px) { .grid.cols-2, .grid.cols-3 { grid-template-columns: 1fr; } }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px 22px; box-shadow: var(--shadow);
}
.card h3 { margin: 0 0 8px; font-size: 1.12rem; }
.card p { margin: 0; color: var(--muted); font-size: .96rem; }
.tag {
  display: inline-block; margin-top: 12px; font-size: .74rem; font-weight: 700; letter-spacing: .03em;
  color: var(--sdsu-red); background: var(--accent-soft); padding: 3px 9px; border-radius: 999px;
}

/* ---- People ---- */
.people-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
@media (max-width: 820px) { .people-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .people-grid { grid-template-columns: 1fr; } }
.person { display: flex; gap: 14px; align-items: flex-start; padding: 16px; background: var(--card);
  border: 1px solid var(--line); border-radius: var(--radius); }
.avatar { flex: 0 0 auto; width: 46px; height: 46px; border-radius: 50%; background: var(--sdsu-red);
  color: #fff; display: grid; place-items: center; font-weight: 700; font-size: 1.05rem; font-family: Georgia, serif; }
.person .name { font-weight: 700; }
.person .role { color: var(--sdsu-red); font-size: .82rem; font-weight: 600; }
.person .who { color: var(--muted); font-size: .86rem; margin-top: 4px; }
.person a { font-size: .82rem; word-break: break-all; }

/* ---- Publications ---- */
.pub-year { margin: 30px 0 10px; padding-bottom: 6px; border-bottom: 2px solid var(--sdsu-red);
  color: var(--sdsu-red); font-size: 1.3rem; }
.pub-list { list-style: none; padding: 0; margin: 0; }
.pub-list li { padding: 12px 0; border-bottom: 1px solid var(--line); color: var(--ink); font-size: .97rem; }
.pub-list li .venue { color: var(--muted); font-style: italic; }

/* ---- Prose ---- */
.prose h3 { margin: 26px 0 8px; }
.prose p { color: var(--ink); }
.prose ul { color: var(--ink); }

/* ---- Footer ---- */
.site-footer { border-top: 1px solid var(--line); background: var(--bg-alt); padding: 34px 0; margin-top: 20px; }
.site-footer .cols { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 20px; }
.site-footer .muted { color: var(--muted); font-size: .9rem; }
.site-footer a { color: var(--ink); }

/* ---- Figures inside research cards ---- */
.card figure { margin: -2px 0 14px; }
.card figure img { width: 100%; display: block; border-radius: 8px; border: 1px solid var(--line); background: #fff; }
.card figure figcaption { font-size: .76rem; color: var(--muted); margin-top: 7px; line-height: 1.45; }

/* Headshots fill the round avatar */
.avatar img { width: 100%; height: 100%; object-fit: cover; border-radius: 50%; display: block; }