/* --- Base -------------------------------------------------------------- */
:root {
  --bg: #f7fafb;
  --fg: #0b0b0c;
  --muted: #54656a;
  --link: #155eef;          /* visited links will use this too */
  --card: #fbfeff;
  --card-strong: #f4fbfc;
  --line: #c8d9dd;
  --accent: #0f766e;
  --accent-2: #2d5bba;
  --accent-soft: #e8f3f2;
  --radius: 18px;
  --shadow: 0 2px 4px rgba(9, 28, 32, .05), 0 16px 40px rgba(9, 28, 32, .1);
  color-scheme: light dark;
}

html[data-theme="dark"],
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111719;
    --fg: #edf5f6;
    --muted: #a6babd;
    --link: #8db8ff;
    --card: #151e20;
    --card-strong: #1a2527;
    --line: #29373a;
    --accent: #58d1c6;
    --accent-2: #9bbdff;
    --accent-soft: #1a2d2f;
    --shadow: 0 8px 24px rgba(0,0,0,.28);
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
html { scroll-behavior: smooth; }           /* smooth scroll */
body {
  margin: 0;
  background:
    radial-gradient(circle at top left, color-mix(in oklab, var(--accent-soft), transparent 45%) 0, transparent 22%),
    linear-gradient(180deg, color-mix(in oklab, var(--bg), white 4%) 0%, var(--bg) 18%, var(--bg) 100%);
  color: var(--fg);
  font: 16px/1.6 ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, Apple Color Emoji, Segoe UI Emoji;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 880px; margin: 0 auto; padding: 0 20px; }
a:link, a:visited { color: var(--link); text-decoration-thickness: 1px; text-underline-offset: 3px; } /* no purple */
h1, h2, h3 { line-height: 1.2; margin: 0 0 .5rem; }
h1 { font-size: clamp(2rem, 3vw, 2.8rem); letter-spacing: .2px; }
h2 { font-size: clamp(1.3rem, 2.2vw, 1.6rem); margin-top: 0; }
h3 { font-size: 1.05rem; }
p { margin: .6rem 0; }
ul, ol { padding-left: 1.2rem; }
img { max-width: 100%; height: auto; border-radius: 12px; }

/* Prevent sticky header from covering section titles on scroll */
section { scroll-margin-top: 72px; }
main > section { margin: 18px 0; }

.skip { position: absolute; left: -10000px; top: auto; }
.skip:focus { left: 12px; top: 12px; background: var(--bg); padding: .5rem .75rem; border: 1px solid var(--line); border-radius: 8px; }

/* --- Header ------------------------------------------------------------ */
.site-header {
  position: sticky; top: 0; z-index: 10;
  border-bottom: 1px solid var(--line);
  background: color-mix(in oklab, var(--bg), transparent 8%);
  backdrop-filter: saturate(140%) blur(6px);
}
.site-header .wrap { display: flex; align-items: center; gap: 16px; padding: 10px 20px; }
.brand { font-weight: 700; color: var(--fg); text-decoration: none; }
.brand:hover, .brand:focus { color: var(--accent); }
.nav { display: flex; align-items: center; gap: 14px; margin-left: auto; }
.nav a {
  color: var(--fg);
  opacity: .85;
  text-decoration: none;
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: background-color .18s ease, transform .18s ease, border-color .18s ease, opacity .18s ease;
}
.nav a:hover, .nav a:focus {
  opacity: 1;
  background: var(--card);
  border-color: var(--line);
  transform: translateY(-1px);
}
.nav a:visited { color: var(--fg); }  /* keep nav consistent */

/* Hide any old theme toggle that might still be present */
.theme-btn { display: none !important; }

/* --- Hero -------------------------------------------------------------- */
.hero {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 24px;
  align-items: center;
  margin: 28px 0 18px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 6px);
  background:
    linear-gradient(135deg, color-mix(in oklab, var(--card-strong), white 10%) 0%, var(--card) 65%),
    var(--card);
  box-shadow: var(--shadow);
}
.avatar {
  width: 120px;
  height: 120px;
  object-fit: cover;
  object-position: center 22%;
  border-radius: 50%;
  box-shadow: 0 10px 24px rgba(0,0,0,.16);
  border: 4px solid color-mix(in oklab, var(--card), white 35%);
}
.avatar-fallback {
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 1.8rem;
  background: linear-gradient(135deg, var(--card), color-mix(in oklab, var(--link), white 70%));
  border: 1px solid var(--line);
}
.tagline { margin-top: .2rem; color: var(--muted); }
.tagline .emph { color: var(--accent); font-weight: 700; }
.tagline .emph-alt { color: var(--accent-2); font-weight: 700; }
.meta { margin-top: .5rem; display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .92rem; padding: 7px 12px; border: 1px solid var(--line);
  border-radius: 999px; text-decoration: none; color: var(--fg);
  background: color-mix(in oklab, var(--card), white 15%);
  box-shadow: 0 4px 14px rgba(0,0,0,.04);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.chip:hover, .chip:focus { transform: translateY(-1px); box-shadow: 0 8px 18px rgba(0,0,0,.08); border-color: color-mix(in oklab, var(--accent), var(--line) 55%); }
.icon { width: 14px; height: 14px; display: inline-block; vertical-align: -2px; fill: currentColor; } /* icons visible in light/dark */

/* --- Sections ---------------------------------------------------------- */
.section-header { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.input { border: 1px solid var(--line); background: var(--bg); color: var(--fg); border-radius: 10px; padding: 6px 10px; }

main > section:not(.hero):not(.plain-section) {
  position: relative;
  padding: 22px 24px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: linear-gradient(180deg, color-mix(in oklab, var(--card), white 10%) 0%, var(--card) 100%);
  box-shadow: var(--shadow);
}

main > section:not(.hero):not(.plain-section)::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 72px;
  height: 6px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), color-mix(in oklab, var(--accent), white 42%));
}

main > section h2 {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

main > section h2::after {
  content: "";
  width: 30px;
  height: 2px;
  border-radius: 999px;
  background: color-mix(in oklab, var(--accent), var(--line) 45%);
}

.plain-section {
  padding: 4px 0 8px;
  border-bottom: 1px solid color-mix(in oklab, var(--line), transparent 18%);
}

.plain-section h2 {
  margin-bottom: 10px;
}

.plain-section h2::after {
  width: 42px;
}

.list-section {
  background: linear-gradient(180deg, color-mix(in oklab, var(--card), white 10%) 0%, var(--card) 100%);
}

.emph {
  color: var(--accent);
  font-weight: 700;
}

.emph-alt {
  color: var(--accent-2);
  font-weight: 700;
}

.timeline { list-style: none; padding: 0; margin: 0; }
.timeline li {
  position: relative;
  margin: 0;
  padding: 10px 0 10px 18px;
  border: 0;
  border-bottom: 1px solid color-mix(in oklab, var(--line), transparent 15%);
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}
.timeline li::before {
  content: "";
  position: absolute;
  inset: 12px auto 12px 0;
  width: 4px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--accent), color-mix(in oklab, var(--accent), white 55%));
}
.timeline li:last-child { border-bottom: 0; }
.timeline time {
  font-variant-numeric: tabular-nums;
  color: var(--link);
  font-weight: 700;
  margin-right: .5rem;
}

.pubs { counter-reset: ref; list-style: none; padding: 0; }
.pubs li {
  counter-increment: ref;
  margin: 0;
  padding: 16px 0 16px 3rem;
  text-indent: 0;
  border: 0;
  border-bottom: 1px solid color-mix(in oklab, var(--line), transparent 12%);
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  position: relative;
}
.pubs li:last-child { border-bottom: 0; }
.pubs li::marker { content: none; }
.pubs li::before {
  content: "[" counter(ref) "]";
  color: var(--accent);
  font-weight: 700;
  position: absolute;
  left: 0;
  top: 1rem;
}
.pubs .title { font-weight: 700; color: var(--link); }
.pubs .venue { font-style: italic; color: color-mix(in oklab, var(--fg), var(--link) 35%); font-weight: 600; }
.pubs .links {
  display: inline-flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-left: 8px;
}
.pubs .links a {
  text-decoration: none;
  background: color-mix(in oklab, var(--accent-soft), var(--card) 45%);
  color: var(--fg);
  border: 1px solid color-mix(in oklab, var(--accent), var(--line) 65%);
  padding: 4px 9px;
  border-radius: 999px;
  font-size: .9rem;
}

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }
.card {
  background: linear-gradient(180deg, color-mix(in oklab, var(--card-strong), white 10%), var(--card));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.card:hover, .card:focus-within {
  transform: translateY(-3px);
  box-shadow: 0 14px 32px rgba(0,0,0,.1);
  border-color: color-mix(in oklab, var(--accent), var(--line) 52%);
}
.card h3 { margin-bottom: .2rem; }
.card h3 a { color: var(--link); text-decoration: none; }
.card h3 a:hover, .card h3 a:focus { color: color-mix(in oklab, var(--fg), var(--link) 40%); text-decoration: underline; }
.compact { margin: 0; padding-left: 0; list-style: none; }
.compact li {
  margin: 0;
  padding: 9px 0;
  border-radius: 0;
  background: transparent;
  border: 0;
  border-bottom: 1px solid color-mix(in oklab, var(--line), transparent 16%);
}
.compact li:last-child { border-bottom: 0; }
.muted { color: var(--muted); }

/* --- Footer ------------------------------------------------------------ */
.site-footer { border-top: 1px solid var(--line); margin-top: 40px; background: color-mix(in oklab, var(--card), transparent 10%); }
.site-footer .wrap { padding: 24px 20px; font-size: .92rem; color: var(--muted); }

/* --- Responsiveness ---------------------------------------------------- */
@media (max-width: 760px) {
  .site-header .wrap { align-items: flex-start; flex-direction: column; }
  .nav { margin-left: 0; flex-wrap: wrap; gap: 8px; }
}

@media (max-width: 560px) {
  .hero { grid-template-columns: 80px 1fr; padding: 18px; }
  .avatar { width: 80px; height: 80px; }
  main > section:not(.hero):not(.plain-section) { padding: 18px; }
  .pubs li { padding-left: 2.75rem; }
}

/* --- Print ------------------------------------------------------------- */
@media print {
  .site-header, .nav, #projects, #news { display: none !important; }
  body { background: #fff; color: #000; }
}