:root {
  --bg: #fcfcfc;
  --surface: #ffffff;
  --ink: #1a1a1c;
  --muted: #646469;
  --faint: #9a9aa0;
  --line: #e8e8ea;
  --accent: #0d9488;
  --accent-hover: #0b7d73;
  --accent-soft: #d6f3ef;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", "Menlo", Consolas, monospace;
  --sans: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
  --maxw: 760px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

/* ---- Nav ---- */
nav.site {
  border-bottom: 1px solid var(--line);
  background: rgba(252,252,252,0.85);
  backdrop-filter: saturate(140%) blur(8px);
  position: sticky; top: 0; z-index: 10;
}
nav.site .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 60px;
}
nav.site a.brand {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
}
nav.site a.brand .dot { color: var(--accent); }
nav.site .links { display: flex; gap: 22px; }
nav.site .links a {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  transition: color .15s;
}
nav.site .links a:hover, nav.site .links a.active { color: var(--accent); }

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

.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 14px;
}

h1 { font-size: 38px; line-height: 1.12; letter-spacing: -0.02em; margin: 0 0 16px; font-weight: 680; }
h2 { font-size: 24px; line-height: 1.25; letter-spacing: -0.015em; margin: 48px 0 14px; font-weight: 640; }
h3 { font-size: 18px; margin: 30px 0 8px; font-weight: 640; }

section { padding: 64px 0; border-bottom: 1px solid var(--line); }
section:last-of-type { border-bottom: none; }

/* ---- Hero ---- */
.hero { padding: 88px 0 64px; }
.hero p.lede { font-size: 20px; line-height: 1.55; color: var(--ink); margin: 0 0 22px; max-width: 660px; }
.hero .sub { color: var(--muted); font-size: 17px; max-width: 640px; }
.meta-row { display: flex; flex-wrap: wrap; gap: 10px 18px; margin-top: 26px; font-family: var(--mono); font-size: 13px; color: var(--muted); }
.meta-row a { color: var(--muted); }
.meta-row a:hover { color: var(--accent); }

/* ---- Buttons ---- */
.btn {
  display: inline-block;
  font-family: var(--mono);
  font-size: 13px;
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  background: var(--surface);
  transition: all .15s;
}
.btn:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.btn.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn.primary:hover { background: var(--accent-hover); color: #fff; }
.btn-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }

/* ---- Timeline / work ---- */
.role { display: grid; grid-template-columns: 130px 1fr; gap: 20px; padding: 22px 0; border-top: 1px solid var(--line); }
.role:first-child { border-top: none; }
.role .when { font-family: var(--mono); font-size: 12.5px; color: var(--faint); padding-top: 3px; }
.role .what h3 { margin: 0 0 4px; font-size: 17px; }
.role .what .org { color: var(--accent); font-weight: 600; }
.role .what p { margin: 6px 0 0; color: var(--muted); font-size: 15.5px; line-height: 1.55; }

/* ---- Cards ---- */
.cards { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 24px; }
.card {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 22px;
  background: var(--surface);
  transition: border-color .15s, transform .15s;
  display: block;
}
.card:hover { border-color: var(--accent); text-decoration: none; transform: translateY(-2px); }
.card .tag { font-family: var(--mono); font-size: 11px; letter-spacing: .06em; text-transform: uppercase; color: var(--faint); }
.card h3 { margin: 8px 0 6px; color: var(--ink); font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 14.5px; line-height: 1.5; }
.card .go { font-family: var(--mono); font-size: 12px; color: var(--accent); margin-top: 14px; display: inline-block; }

/* ---- Post list ---- */
.post-list { margin-top: 8px; }
.post-item { padding: 24px 0; border-top: 1px solid var(--line); }
.post-item:first-child { border-top: none; }
.post-item .date { font-family: var(--mono); font-size: 12.5px; color: var(--faint); }
.post-item h3 { margin: 6px 0 6px; font-size: 20px; }
.post-item h3 a { color: var(--ink); }
.post-item h3 a:hover { color: var(--accent); }
.post-item p { margin: 0; color: var(--muted); font-size: 15.5px; }

/* ---- Article ---- */
article { padding: 56px 0 72px; }
article .post-meta { font-family: var(--mono); font-size: 13px; color: var(--faint); margin-bottom: 10px; }
article h1 { font-size: 32px; }
article .deck { font-size: 19px; color: var(--muted); line-height: 1.5; margin: 0 0 36px; padding-bottom: 28px; border-bottom: 1px solid var(--line); }
article p { margin: 0 0 18px; }
article h2 { font-size: 21px; margin: 38px 0 12px; }
article h3 { font-size: 17px; }
article ul, article ol { padding-left: 22px; margin: 0 0 18px; }
article li { margin-bottom: 8px; }
article .callout { background: var(--accent-soft); border-radius: 8px; padding: 16px 20px; font-size: 15.5px; margin: 0 0 26px; color: #0b5d54; }
article .author-box { margin-top: 44px; padding-top: 24px; border-top: 1px solid var(--line); font-size: 15px; color: var(--muted); }
.back { font-family: var(--mono); font-size: 13px; margin-bottom: 28px; display: inline-block; }

/* ---- Patents ---- */
.patent { border: 1px solid var(--line); border-radius: 10px; padding: 22px 24px; background: var(--surface); margin-bottom: 16px; }
.patent h3 { margin: 0 0 8px; font-size: 18px; }
.patent .nums { font-family: var(--mono); font-size: 13px; color: var(--muted); line-height: 1.9; }
.patent .nums a { color: var(--accent); }
.patent .meta { font-size: 14.5px; color: var(--muted); margin: 10px 0 0; }

/* ---- Paper page ---- */
.abstract { background: var(--surface); border: 1px solid var(--line); border-left: 3px solid var(--accent); border-radius: 8px; padding: 22px 24px; font-size: 15.5px; line-height: 1.6; color: #333; margin: 24px 0; }
.stat-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 14px; margin: 28px 0; }
.stat { border: 1px solid var(--line); border-radius: 8px; padding: 16px; text-align: center; background: var(--surface); }
.stat .num { font-family: var(--mono); font-size: 24px; font-weight: 600; color: var(--accent); }
.stat .lbl { font-size: 12.5px; color: var(--muted); margin-top: 4px; line-height: 1.35; }

/* ---- GitHub contribution charts ---- */
.gh-years { display: block; border: 1px solid var(--line); border-radius: 10px; padding: 22px 24px; background: var(--surface); margin-top: 24px; transition: border-color .15s; }
.gh-years:hover { border-color: var(--accent); text-decoration: none; }
.gh-years img { width: 100%; height: auto; display: block; border: 1px solid var(--line); border-radius: 8px; margin-bottom: 14px; }
.gh-years .gh-handle { font-family: var(--mono); font-size: 13px; color: var(--accent); display: inline-block; margin-top: 4px; }

/* ---- Résumé ---- */
.cv-role { padding: 18px 0; border-top: 1px solid var(--line); }
.cv-role:first-of-type { border-top: none; }
.cv-head { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; flex-wrap: wrap; }
.cv-head h3 { margin: 0; font-size: 17px; }
.cv-head .org { color: var(--accent); }
.cv-when { font-family: var(--mono); font-size: 12.5px; color: var(--faint); white-space: nowrap; }
.cv-loc { font-family: var(--mono); font-size: 12px; color: var(--faint); margin-top: 2px; }
.org-blurb { color: var(--muted); font-size: 14.5px; font-style: italic; margin: 8px 0 6px; }
.cv-role ul { margin: 8px 0 0; padding-left: 20px; }
.cv-role li { font-size: 15px; color: #333; margin-bottom: 6px; line-height: 1.5; }

/* ---- Footer ---- */
footer { padding: 40px 0 56px; }
footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; font-family: var(--mono); font-size: 12.5px; color: var(--faint); }
footer a { color: var(--muted); }

@media (max-width: 640px) {
  body { font-size: 16px; }
  h1 { font-size: 30px; }
  .hero { padding: 56px 0 40px; }
  .cards, .stat-grid { grid-template-columns: 1fr; }
  .role { grid-template-columns: 1fr; gap: 4px; }
  .role .when { padding-top: 0; }
  nav.site .links { gap: 14px; }
  nav.site .links a { font-size: 12px; }
}