:root {
  /* light-dark() picks a value from the active color-scheme, set below */
  color-scheme: light dark;
  --ink: light-dark(#0f172a, #e2e8f0);
  --muted: light-dark(#475569, #94a3b8);
  --navy: light-dark(#1f3a5f, #8fb3e0);
  --navy-soft: light-dark(#e8eef6, #1a2a40);
  --bg: light-dark(#ffffff, #0b1220);
  --surface: light-dark(#f6f8fb, #111a2b);
  --line: light-dark(#e2e8f0, #1f2b3d);
  --ok: light-dark(#15803d, #22c55e);
  --on-navy: light-dark(#ffffff, #0b1220);
  --navy-hover: light-dark(#172d4a, #a9c5ea);
  --top-bg: light-dark(rgba(255,255,255,.95), rgba(11,18,32,.95));
  --shadow: light-dark(rgba(15,23,42,.06), rgba(0,0,0,.4));
  --radius: 8px;
  --max: 960px;
}
:root[data-theme="light"] { color-scheme: light; }
:root[data-theme="dark"] { color-scheme: dark; }

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--navy); text-underline-offset: 3px; }
a:focus-visible, .btn:focus-visible { outline: 2px solid var(--navy); outline-offset: 2px; }

h1, h2, h3 { line-height: 1.2; letter-spacing: -0.01em; margin: 0; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.125rem; }
p { margin: 0 0 1rem; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 16px; }

/* Header */
.top { border-bottom: 1px solid var(--line); position: sticky; top: 0; background: var(--top-bg); z-index: 10; }
.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 56px; }
.brand { font-weight: 700; color: var(--ink); text-decoration: none; white-space: nowrap; }
.top nav { display: flex; gap: 20px; overflow-x: auto; margin-left: auto; }
.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center; flex-shrink: 0;
  width: 40px; height: 40px; border: 1px solid var(--line); border-radius: var(--radius);
  background: transparent; color: var(--muted); cursor: pointer;
}
.theme-toggle:hover { color: var(--ink); border-color: var(--navy); }
.theme-toggle:focus-visible { outline: 2px solid var(--navy); outline-offset: 2px; }
.top nav a { color: var(--muted); text-decoration: none; font-size: .9375rem; white-space: nowrap; }
.top nav a:hover { color: var(--ink); }
@media (max-width: 600px) { .top nav .opt { display: none; } .top nav { gap: 14px; } }

/* Sections */
section { padding: 64px 0; border-bottom: 1px solid var(--line); }
section:last-of-type { border-bottom: 0; }
.eyebrow { font-size: .8125rem; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--navy); margin-bottom: 8px; }
.section-head { margin-bottom: 32px; }
.section-head p { color: var(--muted); margin-top: 8px; max-width: 60ch; }

/* Hero */
.hero { padding: 80px 0 64px; }
.hero-id { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; }
.avatar { width: 72px; height: 72px; border-radius: 50%; object-fit: cover; border: 1px solid var(--line); }
.status { display: inline-flex; align-items: center; gap: 8px; font-size: .875rem; color: var(--muted); }
.status::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--ok); }
.hero h1 { font-size: clamp(2rem, 5vw, 3rem); max-width: 20ch; }
.hero .lede { font-size: 1.125rem; color: var(--muted); max-width: 62ch; margin: 20px 0 32px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex; align-items: center; min-height: 44px; padding: 0 18px;
  border-radius: var(--radius); border: 1px solid var(--line);
  color: var(--ink); background: var(--bg); text-decoration: none; font-weight: 500;
}
.btn:hover { border-color: var(--navy); }
.btn.primary { background: var(--navy); border-color: var(--navy); color: var(--on-navy); }
.btn.primary:hover { background: var(--navy-hover); }

/* Hero focus areas */
.focus { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 24px; margin: 48px 0 0; padding-top: 32px; border-top: 1px solid var(--line); }
.focus dt { font-weight: 600; margin-bottom: 4px; }
.focus dd { margin: 0; color: var(--muted); font-size: .9375rem; }

/* Case study cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.card {
  display: block; padding: 24px; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--bg); color: inherit; text-decoration: none; transition: border-color .15s, box-shadow .15s;
}
.card:hover { border-color: var(--navy); box-shadow: 0 4px 16px var(--shadow); }
.card h3 { margin-bottom: 8px; }
.card p { color: var(--muted); font-size: .9375rem; }
.card .more { font-size: .875rem; font-weight: 600; color: var(--navy); }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 16px; padding: 0; list-style: none; }
.tags li { font-size: .75rem; padding: 2px 8px; border-radius: 4px; background: var(--navy-soft); color: var(--navy); }

/* Experience */
.job { display: grid; grid-template-columns: 180px 1fr; gap: 24px; padding: 24px 0; border-top: 1px solid var(--line); }
.job:first-child { border-top: 0; padding-top: 0; }
.job .when { color: var(--muted); font-size: .875rem; }
.job h3 span { font-weight: 400; color: var(--muted); }
.job ul { margin: 12px 0 0; padding-left: 18px; color: var(--muted); }
.job li { margin-bottom: 6px; }
@media (max-width: 640px) { .job { grid-template-columns: 1fr; gap: 4px; } }

/* Skills */
.skills { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 24px 32px; margin: 0; }
.skills dt { font-weight: 600; margin-bottom: 4px; }
.skills dd { margin: 0; color: var(--muted); }

/* Muted band */
.band { background: var(--surface); }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
@media (max-width: 640px) { .split { grid-template-columns: 1fr; } }

/* Footer */
footer { padding: 48px 0; background: var(--surface); border-top: 1px solid var(--line); }
footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; }
footer p { margin: 0; color: var(--muted); font-size: .875rem; }

/* Case study page */
.cs-head { padding: 56px 0 40px; border-bottom: 1px solid var(--line); }
.cs-head h1 { font-size: clamp(1.75rem, 4vw, 2.5rem); max-width: 24ch; margin-bottom: 16px; }
.cs-head .lede { color: var(--muted); font-size: 1.125rem; max-width: 62ch; }
.meta { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 16px; margin: 32px 0 0; }
.meta dt { font-size: .75rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }
.meta dd { margin: 2px 0 0; font-weight: 500; }
.prose { max-width: 68ch; padding: 48px 0 64px; }
.prose h2 { font-size: 1.25rem; margin: 40px 0 12px; }
.prose h2:first-child { margin-top: 0; }
.prose ul { padding-left: 18px; }
.prose li { margin-bottom: 8px; }
.note { font-size: .875rem; color: var(--muted); border-left: 3px solid var(--line); padding-left: 12px; margin-top: 40px; }
.flow { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 16px 0 24px; padding: 16px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); font-size: .875rem; }
.flow span { padding: 6px 10px; background: var(--bg); border: 1px solid var(--line); border-radius: 6px; }
.flow i { font-style: normal; color: var(--muted); }
.next { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding: 24px 0 48px; border-top: 1px solid var(--line); }

/* Archive */
.prose.wide { max-width: none; }
.prose.wide > p, .prose.wide > ul, .prose.wide > h2, .prose.wide > h3 { max-width: 68ch; }
.prose.flush { padding: 0; }
.prose h3 { margin: 24px 0 8px; }
.prose.flush h3:first-child { margin-top: 0; }
.prose .actions { margin: 24px 0; }
.video { aspect-ratio: 16 / 9; margin: 24px 0; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); background: var(--surface); }
.video iframe { width: 100%; height: 100%; border: 0; display: block; }
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 12px; margin: 24px 0; align-items: start; }
.gallery a { display: block; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--surface); }
/* Uniform tiles: the archive mixes landscape and tall phone screenshots */
.gallery img { display: block; width: 100%; aspect-ratio: 4 / 3; object-fit: contain; }
.card .thumb { display: block; width: 100%; height: auto; aspect-ratio: 570 / 394; object-fit: cover; border-radius: 6px; margin-bottom: 16px; background: var(--surface); }
.group { margin: 40px 0 16px; }
.group:first-of-type { margin-top: 0; }