:root {
  --bg: #fbfbfa;
  --surface: #ffffff;
  --text: #16191d;
  --muted: #5b6470;
  --line: #e4e7eb;
  --accent: #0b5cad;
  --accent-soft: #e8f0fa;
  --code: #f2f4f6;
  --radius: 12px;
  --max: 980px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1216;
    --surface: #161a20;
    --text: #e8ebef;
    --muted: #9aa4b0;
    --line: #262c34;
    --accent: #6aa8ec;
    --accent-soft: #15253a;
    --code: #1c2129;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img, svg { max-width: 100%; height: auto; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* nav */
.nav { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(160%) blur(10px); border-bottom: 1px solid var(--line); }
.nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 56px; gap: 16px; }
.brand { font-weight: 700; color: var(--text); letter-spacing: -.2px; }
.nav ul { display: flex; gap: 20px; list-style: none; margin: 0; padding: 0; font-size: 14.5px; }
.nav ul a { color: var(--muted); }
.nav ul a:hover { color: var(--text); text-decoration: none; }
@media (max-width: 640px) { .nav ul li.hide-sm { display: none; } .nav ul { gap: 14px; } }

/* hero */
.hero { padding-top: 72px; padding-bottom: 48px; }
.eyebrow { color: var(--accent); font-weight: 600; font-size: 14px; letter-spacing: .4px; text-transform: uppercase; margin: 0 0 12px; }
.hero h1 { font-size: clamp(34px, 6vw, 54px); line-height: 1.08; letter-spacing: -1.2px; margin: 0 0 18px; }
.hero p.lead { font-size: clamp(17px, 2.2vw, 19.5px); color: var(--muted); max-width: 680px; margin: 0 0 28px; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 10px 16px; border-radius: 10px; font-weight: 600;
  font-size: 15px; border: 1px solid var(--line); color: var(--text); background: var(--surface); }
.btn:hover { text-decoration: none; border-color: var(--muted); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
@media (prefers-color-scheme: dark) { .btn.primary { color: #0b1420; } }
.btn svg { width: 17px; height: 17px; }

.facts { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin: 44px 0 0; }
.fact { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }
.fact b { display: block; font-size: 24px; letter-spacing: -.5px; }
.fact span { color: var(--muted); font-size: 13.5px; }
@media (max-width: 720px) { .facts { grid-template-columns: repeat(2, 1fr); } }

/* sections */
section { padding: 44px 0; border-top: 1px solid var(--line); }
h2 { font-size: 26px; letter-spacing: -.5px; margin: 0 0 8px; }
.sub { color: var(--muted); margin: 0 0 26px; max-width: 680px; }
h3 { font-size: 19px; margin: 0 0 6px; letter-spacing: -.2px; }

.cards { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 760px) { .cards { grid-template-columns: 1fr; } }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px;
  display: flex; flex-direction: column; }
.card p { color: var(--muted); margin: 0 0 14px; }
.card .more { margin-top: auto; font-weight: 600; font-size: 15px; }
.label { font-size: 12.5px; font-weight: 600; color: var(--accent); background: var(--accent-soft); border-radius: 999px;
  padding: 2px 10px; display: inline-block; margin-bottom: 12px; align-self: flex-start; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 16px; padding: 0; list-style: none; }
.tags li { font-size: 12.5px; background: var(--code); border: 1px solid var(--line); border-radius: 6px; padding: 1px 8px; color: var(--muted); }

/* timeline */
.job { display: grid; grid-template-columns: 170px 1fr; gap: 18px; padding: 16px 0; }
.job + .job { border-top: 1px dashed var(--line); }
.job .when { color: var(--muted); font-size: 14.5px; }
.job ul { margin: 6px 0 0; padding-left: 18px; color: var(--muted); }
.job li { margin: 3px 0; }
@media (max-width: 640px) { .job { grid-template-columns: 1fr; gap: 2px; } }

.skills { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
@media (max-width: 760px) { .skills { grid-template-columns: 1fr; } }
.skills div { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; }
.skills h3 { font-size: 15.5px; }
.skills p { color: var(--muted); margin: 0; font-size: 15px; }

.contact { text-align: center; padding: 56px 0 64px; }
.contact .actions { justify-content: center; }

footer { border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; padding: 22px 0 32px; }
footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }

/* case study */
.article { max-width: 760px; }
.article h2 { margin-top: 36px; }
.article p, .article li { color: var(--text); }
.article .muted { color: var(--muted); }
.article ul { padding-left: 20px; }
.article li { margin: 6px 0; }
.figure { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; margin: 18px 0 8px; overflow-x: auto; }
.figure svg { min-width: 640px; display: block; }
.caption { color: var(--muted); font-size: 14px; margin: 0 0 8px; }
.stack { display: grid; grid-template-columns: 150px 1fr; gap: 6px 16px; margin: 12px 0; }
.stack b { font-weight: 600; }
@media (max-width: 560px) { .stack { grid-template-columns: 1fr; } .stack span { margin-bottom: 8px; } }
.callout { background: var(--accent-soft); border-radius: var(--radius); padding: 16px 18px; margin: 18px 0; }
.back { display: inline-block; margin: 28px 0 0; font-size: 15px; }

/* svg diagram tokens */
.d-box { fill: var(--surface); stroke: var(--line); stroke-width: 1.5; }
.d-acc { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 1.5; }
.d-t { fill: var(--text); font: 600 13px -apple-system, "Segoe UI", Roboto, Arial, sans-serif; }
.d-s { fill: var(--muted); font: 11.5px -apple-system, "Segoe UI", Roboto, Arial, sans-serif; }
.d-l { stroke: var(--muted); stroke-width: 1.4; fill: none; }
.d-head { fill: var(--muted); }
section[id] { scroll-margin-top: 56px; }