/* =============================================================
   Noor Sohail — personal website
   One stylesheet, no framework. Edit the tokens below to restyle.
   ============================================================= */

:root {
  /* Brand */
  --plum:        #3b2435;   /* name, nav bar */
  --accent:      #7a4f6d;   /* links, active states */
  --accent-dark: #5a3850;   /* hover */
  --accent-soft: #e9dde5;   /* rules, tags, placeholders */
  --tint:        #f8f4f7;   /* subtle panel background */

  /* Text & surfaces */
  --text:   #1f1b1e;
  --muted:  #5f5760;
  --border: #e6e0e4;
  --bg:     #ffffff;

  /* Type */
  --serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --sans:  'Inter', -apple-system, 'Segoe UI', Roboto, Arial, sans-serif;

  /* Layout */
  --max-width: 960px;
  --gutter: 1.5rem;
  --radius: 8px;
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-dark); text-decoration: underline; text-underline-offset: 2px; }

h1, h2, h3 { font-family: var(--serif); font-weight: 600; color: var(--plum); line-height: 1.25; }

p { margin: 0 0 1em; }

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

/* ── Site header ──────────────────────────────────────────── */
.site-header {
  text-align: center;
  padding: 2rem 0 1.4rem;
  background: var(--bg);
}

.site-name {
  margin: 0;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 2.3rem;
  letter-spacing: -0.01em;
}
.site-name a { color: var(--plum); }
.site-name a:hover { text-decoration: none; }

.site-tagline {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.5;
}

.social {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin: 0.9rem 0 0;
  padding: 0;
  list-style: none;
}
.social a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
}
.social svg { width: 18px; height: 18px; fill: currentColor; }

/* ── Navigation ───────────────────────────────────────────── */
.site-nav { background: var(--plum); }

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  margin: 0 auto;
  padding: 0 var(--gutter);
  max-width: var(--max-width);
  list-style: none;
}

.site-nav a {
  display: block;
  padding: 0.85rem 1rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.82);
  border-bottom: 3px solid transparent;
}
.site-nav a:hover { color: #fff; text-decoration: none; background: rgba(255, 255, 255, 0.08); }
.site-nav a[aria-current="page"] { color: #fff; border-bottom-color: var(--accent-soft); }

/* ── Main content ─────────────────────────────────────────── */
main { padding: 2.5rem 0 3rem; }


/* Page title with a button beside it, both above the title line (Experience page) */
.page-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.5rem;
  margin: 0 0 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--accent-soft);
}
.page-header .page-title { margin: 0; padding: 0; border: 0; }

.page-title {
  font-size: 1.9rem;
  margin: 0 0 1.5rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--accent-soft);
}

/* Later headings on a page: identical to the page title, with extra space above */
.section-heading {
  font-size: 1.9rem;
  margin: 3rem 0 1.5rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--accent-soft);
}


.lead { font-size: 1.08rem; }

.muted { color: var(--muted); }

/* Buttons */
.button {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.6rem 1.2rem;
  border-radius: 6px;
  border: 1.5px solid var(--accent);
  font-size: 0.9rem;
  font-weight: 600;
  background: var(--accent);
  color: #fff;
}
.button:hover { background: var(--accent-dark); border-color: var(--accent-dark); color: #fff; text-decoration: none; }


/* Tags */
.tag {
  display: inline-block;
  padding: 0.1rem 0.5rem;
  border-radius: 4px;
  background: var(--accent-soft);
  color: var(--accent-dark);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  vertical-align: middle;
}

/* ── Home / About ─────────────────────────────────────────── */
/* Photo floats right; text wraps around it. The paragraph marked .clear always starts
   below the photo so it runs the full width of the page. */
.about-text::after { content: ""; display: block; clear: both; }
.about-photo {
  float: right;
  width: 250px;
  margin: 0.35rem 0 1rem 2rem;
  border-radius: var(--radius);
  aspect-ratio: 1;
  object-fit: cover;
}
.about-text .clear { clear: right; }

.interests {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.interests li {
  padding: 0.9rem 1rem;
  background: var(--tint);
  border-left: 3px solid var(--accent);
  border-radius: 0 6px 6px 0;
  line-height: 1.5;
}
.interests strong { display: block; color: var(--plum); font-size: 0.98rem; }
.interests span { font-size: 0.9rem; color: var(--muted); }

.skills {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.75rem 2.5rem;
}
.skill-group h3 {
  margin: 0 0 0.25rem;
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--plum);
}
.skill-group p { margin: 0; color: var(--muted); font-size: 0.95rem; line-height: 1.6; }

/* ── Experience timeline ──────────────────────────────────── */
.timeline { margin: 0; padding: 0; list-style: none; }

.timeline-item {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 1.25rem;
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--border);
}
.timeline-item:last-child { border-bottom: none; }

.timeline-logo {
  width: 72px;
  height: 72px;
  object-fit: contain;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 6px;
  background: #fff;
}

.timeline-head { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0 1rem; align-items: baseline; }
.timeline-title { margin: 0; font-family: var(--sans); font-size: 1.05rem; font-weight: 700; color: var(--text); }
.timeline-date { font-size: 0.82rem; font-weight: 600; color: var(--accent); white-space: nowrap; }
.timeline-org { margin: 0.1rem 0 0.5rem; color: var(--muted); font-size: 0.93rem; line-height: 1.5; }
.timeline-summary { margin: 0; font-size: 0.97rem; }
.timeline-item ul { margin: 0; padding-left: 1.1rem; font-size: 0.95rem; }
.timeline-item li { margin-bottom: 0.3rem; }
.timeline-item li::marker { color: var(--accent); }

/* ── Publications ─────────────────────────────────────────── */
.pub-list { margin: 0; padding: 0; list-style: none; }

.pub {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 1.5rem;
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--border);
  align-items: center;
}
.pub:last-child { border-bottom: none; }

.pub-thumb {
  width: 150px;
  height: 120px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: #fff;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.pub-thumb img { width: 100%; height: 100%; object-fit: contain; }
.pub-thumb.placeholder {
  background: var(--tint);
  color: var(--accent);
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 600;
  text-align: center;
  padding: 0.5rem;
  line-height: 1.25;
}

.pub-title { font-weight: 600; font-size: 1.02rem; line-height: 1.45; }
.pub-authors { margin: 0.3rem 0 0.15rem; font-size: 0.9rem; color: var(--muted); line-height: 1.5; }
.me { color: var(--accent); font-weight: 700; white-space: nowrap; }
.pub-venue { font-size: 0.88rem; color: var(--muted); }
.pub-venue em { color: var(--text); }

.plain-list { padding-left: 1.1rem; }
.plain-list li { margin-bottom: 0.6rem; font-size: 0.95rem; }

/* ── Teaching cards ───────────────────────────────────────── */
.cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
  transition: box-shadow 0.2s, transform 0.2s;
  color: inherit;
  text-decoration: none;
}
.card:hover { color: inherit; text-decoration: none; }
.card:hover .card-link { text-decoration: underline; }
.card:hover { box-shadow: 0 8px 24px rgba(59, 36, 53, 0.12); transform: translateY(-2px); }

.card-image {
  position: relative;
  aspect-ratio: 16 / 10;
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 0.75rem;
}
.card-image img { position: absolute; inset: 0.75rem; width: calc(100% - 1.5rem); height: calc(100% - 1.5rem); object-fit: contain; }

.card-body { padding: 1.1rem 1.25rem 1.3rem; display: flex; flex-direction: column; flex: 1; }
.card-body h3 { margin: 0.5rem 0 0.4rem; font-size: 1.2rem; min-height: 2.5em; }  /* room for 2 lines keeps cards aligned */
.card-body p { font-size: 0.93rem; color: var(--muted); flex: 1; }
.card-meta { font-size: 0.8rem; color: var(--muted); margin-bottom: 0.9rem; }
.card-link { font-weight: 600; font-size: 0.9rem; }

/* ── Beyond the lab ───────────────────────────────────────── */
.feature {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 2.5rem;
  align-items: center;
}
.feature.reverse { grid-template-columns: 280px 1fr; }
.feature img { border-radius: var(--radius); aspect-ratio: 1; object-fit: cover; width: 100%; }

.gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin: 1.75rem 0 0;
}
.gallery figure { margin: 0; }
.gallery img { border-radius: 6px; aspect-ratio: 16 / 9; object-fit: cover; width: 100%; }

.divider { border: none; border-top: 1px solid var(--border); margin: 2.5rem 0; }

/* ── Footer ───────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0 2rem;
  text-align: center;
  font-size: 0.82rem;
  color: var(--muted);
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 760px) {
  body { font-size: 16px; }
  main { padding: 1.75rem 0 2.5rem; }

  .site-header { padding: 1.5rem 0 1.1rem; }
  .site-name { font-size: 1.85rem; }
  .site-tagline { font-size: 0.92rem; }

  .site-nav ul { padding: 0 0.5rem; }
  .site-nav a { padding: 0.7rem 0.6rem; font-size: 0.72rem; letter-spacing: 0.04em; }

  .skills { grid-template-columns: 1fr; gap: 1.25rem; }
  .about-photo { width: 150px; margin: 0.25rem 0 0.75rem 1.25rem; }


  .timeline-item { grid-template-columns: 48px 1fr; gap: 1rem; }
  .timeline-logo { width: 48px; height: 48px; padding: 4px; }

  .pub { grid-template-columns: 1fr; gap: 0.75rem; }
  .pub-thumb { display: none; }

  .cards { grid-template-columns: 1fr; }
  .card-body h3 { min-height: 0; }

  .feature, .feature.reverse { grid-template-columns: 1fr; gap: 1.25rem; }
  .feature img { max-width: 320px; margin: 0 auto; }
  .feature.reverse .feature-text { order: 2; }

  .gallery { grid-template-columns: 1fr; }

  .site-tagline .sep { display: block; height: 0; overflow: hidden; }
}

/* ── Publication topic tags ──────────────────────────────── */
.pub-topics { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-top: 0.45rem; }
.topic {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.1rem 0.55rem;
  border-radius: 999px;
  background: var(--tint);
  border: 1px solid var(--accent-soft);
  color: var(--accent);
}
.pub { scroll-margin-top: 1rem; }
.pub:target { background: var(--tint); }

/* Related-paper links on the About page interest cards */
.interest-papers { margin-top: 0.5rem; display: flex; flex-direction: column; gap: 0.1rem; }
.interest-papers a { font-size: 0.8rem; font-weight: 600; line-height: 1.45; }
.interest-papers a::before { content: "\2192\00a0"; }