/* ==========================================================================
   Hamza Ruzayqat — personal academic website
   Lightweight stylesheet (no framework, no jQuery)
   ========================================================================== */

:root {
  --ink: #0f1d2e;
  --ink-2: #3b4a5c;
  --muted: #6b7788;
  --line: #e3e7ed;
  --bg: #ffffff;
  --bg-soft: #f6f8fb;
  --navy: #0b2340;
  --accent: #1d5fbf;
  --accent-soft: #e8f0fb;
  --gold: #b7862b;
  --radius: 14px;
  --maxw: 1120px;
  --serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 72px; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

img, video { max-width: 100%; display: block; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.2; margin: 0 0 .5em; letter-spacing: -.01em; }
h2 { font-size: clamp(1.7rem, 3vw, 2.2rem); }
h3 { font-size: 1.2rem; }
p { margin: 0 0 1em; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- Navigation ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav .container { display: flex; align-items: center; justify-content: space-between; height: 62px; gap: 16px; }
.brand { font-family: var(--serif); font-weight: 600; font-size: 1.15rem; color: var(--ink); white-space: nowrap; }
.brand:hover { text-decoration: none; }
.nav ul { list-style: none; display: flex; gap: 4px; margin: 0; padding: 0; overflow-x: auto; scrollbar-width: none; }
.nav ul::-webkit-scrollbar { display: none; }
.nav a.link { display: block; padding: 6px 11px; border-radius: 8px; color: var(--ink-2); font-size: .9rem; font-weight: 500; white-space: nowrap; }
.nav a.link:hover { background: var(--bg-soft); color: var(--ink); text-decoration: none; }

/* ---------- Hero ---------- */
.hero {
  background: radial-gradient(1200px 500px at 85% -10%, #1b4f8f 0%, transparent 60%), var(--navy);
  color: #fff;
  padding: 72px 0 64px;
}
.hero .container { display: grid; grid-template-columns: 1fr 1.05fr; gap: 48px; align-items: center; }
.eyebrow { text-transform: uppercase; letter-spacing: .14em; font-size: .75rem; font-weight: 600; color: #9cc3f5; margin-bottom: 14px; }
.identity { display: flex; align-items: center; gap: 22px; margin-bottom: 18px; }
.headshot { width: 132px; height: 132px; flex: 0 0 132px; border-radius: 50%; object-fit: cover; object-position: 50% 30%; border: 3px solid rgba(255, 255, 255, .85); box-shadow: 0 10px 30px -10px rgba(0, 0, 0, .6); }
.identity .role { margin-bottom: 0; }
.hero .identity h1 { font-size: clamp(1.7rem, 3.4vw, 2.8rem); white-space: nowrap; margin-bottom: 6px; }
.hero h1 { font-size: clamp(2.4rem, 5vw, 3.6rem); margin-bottom: 12px; color: #fff; }
.hero .role { font-size: 1.1rem; color: #d6e2f1; margin-bottom: 18px; }
.hero .pitch { color: #b9c8da; font-size: 1.02rem; max-width: 34em; }
.hero .pitch strong { color: #fff; font-weight: 600; }
.hero .pitch { margin-bottom: 12px; }
.themes { list-style: none; margin: 0; padding: 0; max-width: 36em; }
.themes li { position: relative; padding: 7px 0 7px 18px; color: #b9c8da; font-size: .95rem; line-height: 1.55; border-top: 1px solid rgba(255, 255, 255, .08); }
.themes li::before { content: ""; position: absolute; left: 0; top: 15px; width: 7px; height: 7px; border-radius: 50%; background: #9cc3f5; }
.themes strong { color: #fff; font-weight: 600; }
.hero .actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }

.btn { display: inline-flex; align-items: center; gap: 8px; padding: 10px 18px; border-radius: 10px; font-weight: 600; font-size: .92rem; border: 1px solid transparent; transition: background .2s, border-color .2s, transform .2s; }
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn svg { width: 17px; height: 17px; fill: currentColor; }
.btn-primary { background: #fff; color: var(--navy); }
.btn-primary:hover { background: #e7eef8; }
.btn-ghost { color: #fff; border-color: rgba(255, 255, 255, .28); }
.btn-ghost:hover { background: rgba(255, 255, 255, .08); border-color: rgba(255, 255, 255, .5); }

.hero-media { background: #fff; border-radius: var(--radius); padding: 8px; box-shadow: 0 30px 60px -20px rgba(0, 0, 0, .5); }
.hero-media video, .hero-media img { width: 100%; height: auto; border-radius: 9px; }
.hero-media figcaption { color: var(--muted); font-size: .8rem; padding: 8px 6px 2px; line-height: 1.45; }

.hero .stats { grid-column: 1 / -1; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; margin-top: 56px; background: rgba(255, 255, 255, .12); border-radius: var(--radius); overflow: hidden; }
.stat { background: var(--navy); padding: 18px 20px; }
.stat b { display: block; font-family: var(--serif); font-size: 1.9rem; font-weight: 600; color: #fff; line-height: 1.1; }
.stat span { font-size: .82rem; color: #9fb2c8; }
.stat b span { font-size: inherit; color: #fff; }
.stat b .sep { color: #9cc3f5; margin: 0 .3em; font-weight: 400; }

/* ---------- Sections ---------- */
section.block { padding: 80px 0; }
section.block.soft { background: var(--bg-soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-bottom: 32px; flex-wrap: wrap; }
.section-head p { color: var(--muted); margin: 0; max-width: 42em; }
.kicker { display: block; font-family: var(--sans); text-transform: uppercase; letter-spacing: .14em; font-size: .72rem; font-weight: 600; color: var(--accent); margin-bottom: 8px; }

/* ---------- About + News ---------- */
.about { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
.about .bio p { color: var(--ink-2); }
.edu { list-style: none; padding: 0; margin: 18px 0 0; border-top: 1px solid var(--line); }
.edu li { padding: 10px 0; border-bottom: 1px solid var(--line); font-size: .92rem; color: var(--ink-2); }
.edu b { color: var(--ink); font-weight: 600; }

.news h3 { font-family: var(--sans); font-size: .78rem; text-transform: uppercase; letter-spacing: .14em; color: var(--muted); margin-bottom: 12px; }
.news ul { list-style: none; margin: 0; padding: 0; }
.news li { display: grid; grid-template-columns: 78px 1fr; gap: 12px; padding: 11px 0; border-bottom: 1px solid var(--line); font-size: .9rem; color: var(--ink-2); line-height: 1.5; }
.news time { font-size: .78rem; font-weight: 600; color: var(--muted); padding-top: 2px; }
.news li.highlight { background: linear-gradient(90deg, #fff7e6, transparent); margin: 0 -10px; padding-left: 10px; padding-right: 10px; border-radius: 8px; border-bottom-color: transparent; }
.news li.highlight time { color: var(--gold); }
.tag { display: inline-block; font-size: .68rem; font-weight: 600; text-transform: uppercase; letter-spacing: .06em; padding: 1px 7px; border-radius: 5px; background: var(--accent-soft); color: var(--accent); margin-right: 4px; vertical-align: 1px; }
.tag.gold { background: #fcefd4; color: #8a5f12; }

details.more > summary { cursor: pointer; list-style: none; color: var(--accent); font-weight: 600; font-size: .88rem; padding: 12px 0 0; }
details.more > summary::-webkit-details-marker { display: none; }
details.more > summary::after { content: ' +'; }
details.more[open] > summary::after { content: ' −'; }

/* ---------- Research ---------- */
.feature { display: grid; grid-template-columns: 1.15fr 1fr; gap: 40px; align-items: center; margin-bottom: 56px; }
.feature.reverse { grid-template-columns: 1fr 1.15fr; }
.feature.reverse .feature-media { order: 2; }
.feature-media { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 10px; }
.feature-media img, .feature-media video { width: 100%; border-radius: 8px; }
.feature-media figcaption { font-size: .8rem; color: var(--muted); padding: 8px 4px 0; line-height: 1.45; }
.feature h3 { font-size: 1.55rem; }
.feature p { color: var(--ink-2); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin: 14px 0 10px; }
.chip { font-size: .78rem; padding: 3px 10px; border-radius: 999px; border: 1px solid var(--line); color: var(--ink-2); background: #fff; }
.paper-ref { font-size: .85rem; color: var(--muted); }
.paper-ref a { font-weight: 600; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; display: flex; flex-direction: column; transition: box-shadow .2s, transform .2s; }
.card:hover { box-shadow: 0 14px 30px -18px rgba(15, 29, 46, .35); transform: translateY(-2px); }
.card .thumb { aspect-ratio: 16 / 10; background: #fff; border-bottom: 1px solid var(--line); display: flex; align-items: center; justify-content: center; padding: 8px; }
.card .thumb img { width: 100%; height: 100%; object-fit: contain; }
.card .body { padding: 18px 20px 20px; }
.card h4 { font-family: var(--serif); font-size: 1.1rem; font-weight: 600; margin: 0 0 6px; }
.card p { font-size: .9rem; color: var(--ink-2); margin: 0 0 8px; }
.card .paper-ref { font-size: .8rem; margin: 0; }

/* ---------- Publications ---------- */
.pub-group { margin-bottom: 36px; }
.pub-group > h3 { font-family: var(--sans); font-size: .78rem; text-transform: uppercase; letter-spacing: .14em; color: var(--muted); padding-bottom: 10px; border-bottom: 1px solid var(--line); margin-bottom: 4px; }
.pubs { list-style: none; margin: 0; padding: 0; }
.pubs li { display: grid; grid-template-columns: 56px 1fr auto; gap: 14px; padding: 14px 0; border-bottom: 1px solid var(--line); align-items: baseline; }
.pubs .yr { font-size: .82rem; font-weight: 600; color: var(--muted); }
.pubs .title { display: block; font-weight: 600; color: var(--ink); line-height: 1.45; }
.pubs .authors { display: block; font-size: .88rem; color: var(--ink-2); }
.pubs .authors b { color: var(--ink); font-weight: 600; }
.pubs .venue { display: block; font-size: .88rem; font-style: italic; color: var(--accent); }
.pubs .venue.soon { color: var(--gold); font-style: normal; font-weight: 600; }
.pubs .pdf { font-size: .78rem; font-weight: 600; padding: 4px 10px; border: 1px solid var(--line); border-radius: 7px; color: var(--ink-2); white-space: nowrap; }
.pubs .pdf:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }

.journals { margin-top: 28px; padding: 22px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.journals h3 { font-family: var(--sans); font-size: .78rem; text-transform: uppercase; letter-spacing: .14em; color: var(--muted); margin-bottom: 14px; }
.journal-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; }
.journal-grid a { display: block; border-radius: 8px; overflow: hidden; border: 1px solid var(--line); transition: transform .2s; }
.journal-grid a:hover { transform: translateY(-2px); }
.journal-grid img { width: 100%; height: auto; }

/* ---------- Software / collaborators ---------- */
.repo-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 12px; }
.repo { display: flex; gap: 12px; align-items: flex-start; padding: 14px 16px; border: 1px solid var(--line); border-radius: 12px; background: #fff; color: var(--ink); font-size: .92rem; font-weight: 500; line-height: 1.4; transition: border-color .2s; }
.repo:hover { border-color: var(--accent); text-decoration: none; }
.repo svg { flex: 0 0 18px; width: 18px; height: 18px; fill: var(--muted); margin-top: 1px; }

.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; }
.collab { list-style: none; padding: 0; margin: 0; columns: 2; column-gap: 24px; }
.collab li { break-inside: avoid; padding: 7px 0; border-bottom: 1px solid var(--line); font-size: .9rem; }
.collab a { color: var(--ink); font-weight: 600; }
.collab span { display: block; color: var(--muted); font-size: .8rem; }

/* ---------- Tables (talks, teaching) ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
table { width: 100%; border-collapse: collapse; font-size: .88rem; }
th { text-align: left; font-weight: 600; font-size: .75rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); background: var(--bg-soft); padding: 11px 14px; border-bottom: 1px solid var(--line); }
td { padding: 10px 14px; border-bottom: 1px solid var(--line); color: var(--ink-2); vertical-align: top; }
tr:last-child td { border-bottom: 0; }
td.date { white-space: nowrap; color: var(--muted); font-weight: 500; }
details.table-more > summary { cursor: pointer; padding: 12px 14px; font-weight: 600; font-size: .88rem; color: var(--accent); list-style: none; border-top: 1px solid var(--line); background: var(--bg-soft); }
details.table-more > summary::-webkit-details-marker { display: none; }

/* ---------- Contact / footer ---------- */
.contact { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.contact div { padding: 20px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.contact h4 { margin: 0 0 6px; font-size: .75rem; text-transform: uppercase; letter-spacing: .12em; color: var(--muted); }
.contact p { margin: 0; font-size: .95rem; }
.socials { display: flex; gap: 10px; flex-wrap: wrap; }
.socials a { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; font-size: .9rem; }
.socials svg { width: 18px; height: 18px; fill: currentColor; }

footer { padding: 28px 0; color: var(--muted); font-size: .85rem; border-top: 1px solid var(--line); }
.footer-row { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
#visitor-count b { color: var(--ink); font-weight: 600; }

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .hero .container, .feature, .feature.reverse { grid-template-columns: 1fr; }
  .feature.reverse .feature-media { order: 0; }
  .about { grid-template-columns: 1fr; }
  .cards { grid-template-columns: 1fr 1fr; }
  .two-col { grid-template-columns: 1fr; gap: 48px; }
}

@media (max-width: 680px) {
  body { font-size: 15px; }
  .brand { display: none; }
  .hero { padding: 48px 0; }
  .stats { grid-template-columns: 1fr 1fr; }
  section.block { padding: 56px 0; }
  .about { grid-template-columns: 1fr; }
  .identity { gap: 16px; }
  .headshot { width: 92px; height: 92px; flex-basis: 92px; }
  .hero .identity h1 { white-space: normal; font-size: 1.75rem; }
  .identity > div { min-width: 0; }
  .cards, .contact { grid-template-columns: 1fr; }
  .collab { columns: 1; }
  .pubs li { grid-template-columns: 1fr; gap: 4px; }
  .pubs .pdf { justify-self: start; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}