/* Enamul Hassan — personal site
   Hand-written, no framework, no build step. One stylesheet for all pages. */

:root {
  --bg: #F7F9F9;
  --surface: #FFFFFF;
  --sunken: #EEF3F3;
  --ink: #162326;
  --ink-2: #33474C;
  --muted: #5D6F73;
  --rule: #DAE4E4;
  --accent: #0E6A6E;
  --accent-ink: #0A5053;
  --accent-soft: #E2EFEE;
  --tok-a: #E4ECF6; --tok-a-ink: #24466E;
  --tok-b: #DFEEED; --tok-b-ink: #0A5053;
  --tok-c: #F1E8F4; --tok-c-ink: #5B2C6F;
  --shadow: 0 1px 2px rgba(22,35,38,.05), 0 8px 24px rgba(22,35,38,.06);
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0D1518;
    --surface: #141F23;
    --sunken: #101A1D;
    --ink: #E2EBEC;
    --ink-2: #C3D0D2;
    --muted: #93A6A9;
    --rule: #26383C;
    --accent: #5CC2BC;
    --accent-ink: #8BD5D0;
    --accent-soft: #143231;
    --tok-a: #1A2A3E; --tok-a-ink: #A9C6EA;
    --tok-b: #143231; --tok-b-ink: #8BD5D0;
    --tok-c: #2B1F33; --tok-c-ink: #D9B7E6;
    --shadow: 0 1px 2px rgba(0,0,0,.35), 0 8px 24px rgba(0,0,0,.28);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 16.5px/1.62 var(--sans);
  -webkit-font-smoothing: antialiased;
  font-variant-numeric: tabular-nums;
}

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--accent-ink); }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 3px; }

.skip {
  position: absolute; left: -9999px; top: 0; background: var(--accent); color: #fff;
  padding: 10px 16px; z-index: 100; border-radius: 0 0 6px 0;
}
.skip:focus { left: 0; color: #fff; }

.wrap { max-width: 830px; margin: 0 auto; padding-inline: 20px; }

/* ---------- site header ---------- */
.site-head {
  border-bottom: 1px solid var(--rule);
  background: var(--surface);
  position: sticky; top: 0; z-index: 20;
}
.site-head .wrap {
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 22px;
  padding-block: 12px;
}
.site-head .home {
  font: 600 18px/1.2 var(--serif); color: var(--ink); text-decoration: none; margin-right: auto;
}
.site-head nav { display: flex; flex-wrap: wrap; gap: 4px 18px; font-size: 15px; }
.site-head nav a { color: var(--ink-2); text-decoration: none; }
.site-head nav a:hover, .site-head nav a[aria-current="page"] { color: var(--accent); }
.site-head nav a[aria-current="page"] { font-weight: 600; }

/* ---------- typography ---------- */
main { padding-block: 40px 72px; }
h1 { font: 600 clamp(2rem, 5vw, 2.7rem)/1.1 var(--serif); letter-spacing: -.012em; margin: 0 0 6px; }
h2 {
  font: 600 12px/1 var(--mono); letter-spacing: .12em; text-transform: uppercase;
  color: var(--accent); margin: 48px 0 14px; padding-bottom: 8px; border-bottom: 1px solid var(--rule);
}
h3 { font: 600 1.05rem/1.35 var(--sans); margin: 26px 0 6px; }
p { margin: 0 0 14px; }
.lede { font-size: 1.06rem; color: var(--ink-2); max-width: 64ch; }
.muted { color: var(--muted); }
.small { font-size: .93rem; }

/* ---------- hero ---------- */
.hero { display: grid; grid-template-columns: 1fr; gap: 22px; align-items: start; }
@media (min-width: 620px) { .hero { grid-template-columns: 132px minmax(0, 1fr); gap: 30px; } }
.hero img {
  width: 132px; height: 132px; border-radius: 50%; object-fit: cover;
  border: 1px solid var(--rule); box-shadow: var(--shadow); display: block;
}
.role { color: var(--ink-2); margin: 0 0 14px; }
.links { display: flex; flex-wrap: wrap; gap: 6px 18px; margin: 0 0 16px; font-weight: 500; }
.callout {
  border-left: 3px solid var(--accent); background: var(--accent-soft);
  padding: 11px 15px; border-radius: 0 6px 6px 0; font-size: .97rem;
}
.callout strong { color: var(--accent-ink); }

/* ---------- news ---------- */
.news { list-style: none; margin: 0; padding: 0; display: grid; gap: 9px; }
.news li { display: grid; grid-template-columns: 96px minmax(0, 1fr); gap: 14px; }
.news time { font: 500 13px/1.7 var(--mono); color: var(--muted); }
@media (max-width: 480px) {
  .news li { grid-template-columns: 1fr; gap: 2px; }
  .news time { line-height: 1.4; }
}

/* ---------- research cards ---------- */
.cards { display: grid; grid-template-columns: 1fr; gap: 16px; }
@media (min-width: 700px) { .cards { grid-template-columns: repeat(3, 1fr); } }
.card {
  border: 1px solid var(--rule); border-radius: 10px; background: var(--surface);
  padding: 14px; display: flex; flex-direction: column; gap: 9px;
}
.card svg { width: 100%; height: auto; display: block; background: var(--sunken); border-radius: 6px; }
.card h3 { margin: 0; font-size: 1rem; }
.card p { margin: 0; font-size: .94rem; color: var(--ink-2); }
.card .meta { font: 500 12px/1.4 var(--mono); color: var(--accent); margin-top: auto; }

/* ---------- publications ---------- */
.pubs { display: grid; gap: 16px; margin: 0 0 8px; }
.pub { display: grid; gap: 3px; }
.pub .t { font-weight: 600; }
.pub .a { font-size: .95rem; color: var(--ink-2); }
.pub .v { font-size: .93rem; color: var(--muted); }
.pub .me { text-decoration: underline; text-decoration-color: var(--accent); text-underline-offset: 2px; }
.pub .tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 3px; }
.pub .tags a, .pub .tags span {
  font: 500 12px/1 var(--mono); border: 1px solid var(--rule); border-radius: 4px;
  padding: 4px 7px; text-decoration: none; color: var(--accent-ink);
}
.pub .tags span { color: var(--muted); }
.status {
  display: inline-block; font: 600 11px/1 var(--mono); letter-spacing: .05em; text-transform: uppercase;
  padding: 4px 7px; border-radius: 999px; background: var(--accent-soft); color: var(--accent-ink);
  vertical-align: 1px; margin-left: 6px;
}

/* ---------- key/value rows (teaching, service) ---------- */
.kv { display: grid; gap: 14px; margin: 0; }
.kv > div { display: grid; grid-template-columns: 1fr; gap: 3px; }
@media (min-width: 640px) { .kv > div { grid-template-columns: 200px minmax(0, 1fr); gap: 18px; } }
.kv dt { font-weight: 600; color: var(--ink); }
.kv dd { margin: 0; color: var(--ink-2); }
.kv .yr { font: 500 13px/1.7 var(--mono); color: var(--muted); font-weight: 400; }

/* ---------- project list ---------- */
.projects { display: grid; gap: 22px; }
.project h3 { margin: 0 0 3px; }
.project .when { font: 500 13px/1.6 var(--mono); color: var(--muted); }
.project p { margin: 6px 0 6px; color: var(--ink-2); }

/* ---------- footer ---------- */
footer {
  border-top: 1px solid var(--rule); padding-block: 22px 40px;
  color: var(--muted); font-size: .9rem;
}
footer .wrap { display: flex; flex-wrap: wrap; gap: 6px 18px; justify-content: space-between; }

/* ---------- phones: the header scrolls away instead of eating the screen ---------- */
@media (max-width: 620px) {
  .site-head { position: static; }
  .site-head nav { gap: 4px 13px; font-size: 14.5px; }
}