:root {
  --bg: #ffffff;
  --bg-alt: #f5f7fa;
  --surface: #ffffff;
  --text: #14202e;
  --muted: #5a6878;
  --border: #e3e8ef;
  --accent: #1f3a5f;
  --accent-2: #0f766e;
  --accent-soft: #e8eef6;
  --chip: #eef2f7;
  --shadow: 0 1px 2px rgba(16, 24, 40, .05), 0 4px 16px rgba(16, 24, 40, .06);
  --radius: 14px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0d1420;
    --bg-alt: #111a28;
    --surface: #141f30;
    --text: #e6ecf3;
    --muted: #9aa8b8;
    --border: #233147;
    --accent: #8db4e8;
    --accent-2: #5eead4;
    --accent-soft: #1a2a42;
    --chip: #1b2738;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 4px 16px rgba(0, 0, 0, .25);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 Inter, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { color: var(--accent-2); }
h1, h2, h3 { line-height: 1.2; margin: 0 0 .5em; }
h2 { font-size: clamp(1.6rem, 3vw, 2rem); letter-spacing: -.01em; }
h3 { font-size: 1.1rem; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .wrap { padding: 0 24px; } }

.skip { position: absolute; left: -999px; top: 8px; background: var(--accent); color: #fff; padding: 8px 12px; border-radius: 8px; z-index: 100; }
.skip:focus { left: 8px; }
:focus-visible { outline: 3px solid var(--accent-2); outline-offset: 2px; border-radius: 6px; }

/* Nav */
.nav { position: sticky; top: 0; z-index: 50; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; gap: 12px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--text); text-decoration: none; white-space: nowrap; }
.logo { display: inline-grid; place-items: center; width: 32px; height: 32px; border-radius: 9px; background: #1f3a5f; color: #fff; font-size: .8rem; }
.nav nav { display: flex; gap: 4px; align-items: center; }
.nav nav a { color: var(--muted); text-decoration: none; font-weight: 500; font-size: .92rem; padding: 6px 10px; border-radius: 8px; }
.nav nav a:hover { color: var(--text); background: var(--chip); }
.nav nav a.nav-cta { color: #fff; background: #1f3a5f; }
.nav nav a.nav-cta:hover { background: #0f766e; color: #fff; }
@media (max-width: 560px) { .nav nav a:not(.nav-cta) { display: none; } }

/* Hero */
.hero { padding: 72px 0 56px; background: radial-gradient(1200px 400px at 10% -10%, var(--accent-soft), transparent 70%); }
.eyebrow { color: var(--accent-2); font-weight: 600; font-size: .9rem; letter-spacing: .02em; text-transform: uppercase; margin: 0 0 12px; }
.hero h1 { font-size: clamp(2rem, 5vw, 3.2rem); letter-spacing: -.02em; max-width: 18ch; }
.lead { font-size: clamp(1.05rem, 2vw, 1.2rem); color: var(--muted); max-width: 62ch; }
.lead strong { color: var(--text); font-weight: 600; }
.meta { color: var(--muted); font-size: .95rem; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 20px 0 0; }
.btn { display: inline-flex; align-items: center; padding: 10px 18px; border-radius: 10px; border: 1px solid var(--border); background: var(--surface); color: var(--text); text-decoration: none; font-weight: 600; font-size: .95rem; }
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn.primary { background: #1f3a5f; border-color: #1f3a5f; color: #fff; }
.btn.primary:hover { background: #0f766e; border-color: #0f766e; color: #fff; }

.stats { list-style: none; padding: 0; margin: 44px 0 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
@media (min-width: 820px) { .stats { grid-template-columns: repeat(4, 1fr); } }
.stats li { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow); }
.num { display: block; font-size: 1.8rem; font-weight: 700; color: var(--accent); }
.lbl { display: block; color: var(--muted); font-size: .88rem; line-height: 1.4; }

/* Sections */
.section { padding: 64px 0; }
.section.alt { background: var(--bg-alt); }
.section-lead { color: var(--muted); margin-top: -4px; max-width: 65ch; }
.muted { color: var(--muted); }

/* Featured project */
.feature { margin-top: 24px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
.feature-head { display: flex; justify-content: space-between; gap: 16px; align-items: flex-start; flex-wrap: wrap; }
.feature h3 { font-size: 1.35rem; margin: 0 0 8px; }
.feature h3 a { color: var(--text); text-decoration: none; }
.feature h3 a:hover { color: var(--accent); }
.tag { margin: 0 0 6px; font-size: .8rem; font-weight: 600; color: var(--accent-2); text-transform: uppercase; letter-spacing: .04em; }
.badge img { display: block; }
.points { padding-left: 20px; margin: 12px 0; }
.points li { margin: 6px 0; }
.chips { list-style: none; padding: 0; margin: 12px 0 0; display: flex; flex-wrap: wrap; gap: 8px; }
.chips li { background: var(--chip); border: 1px solid var(--border); border-radius: 999px; padding: 4px 12px; font-size: .85rem; font-weight: 500; }
.links { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 16px; font-weight: 600; }
.links a { text-decoration: none; }

.grid { display: grid; gap: 16px; margin-top: 16px; grid-template-columns: 1fr; }
@media (min-width: 720px) { .grid { grid-template-columns: repeat(2, 1fr); } }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); display: flex; flex-direction: column; }
.card h3 a { color: var(--text); text-decoration: none; }
.card p { color: var(--muted); margin: 0 0 8px; flex: 1; }

.building { margin-top: 28px; border: 1px dashed var(--border); border-radius: var(--radius); padding: 20px 24px; }
.building h3 { margin-bottom: 4px; }
.building ul { padding-left: 20px; margin: 10px 0 0; }
.building li { margin: 6px 0; }

/* Timeline */
.timeline { list-style: none; padding: 0; margin: 24px 0 0; }
.timeline > li { display: grid; grid-template-columns: 1fr; gap: 4px; padding: 20px 0; border-top: 1px solid var(--border); }
@media (min-width: 720px) { .timeline > li { grid-template-columns: 140px 1fr; gap: 24px; } }
.when { font-family: "JetBrains Mono", ui-monospace, monospace; font-size: .85rem; color: var(--muted); padding-top: 2px; }
.what h3 { margin: 0 0 2px; }
.org { color: var(--accent-2); font-weight: 600; margin: 0 0 6px; font-size: .95rem; }
.what p:last-child { margin: 0; }
.projects { margin: 8px 0 0; padding-left: 20px; }
.projects li { margin: 5px 0; }
.subroles { display: grid; gap: 14px; margin-top: 10px; }
.subrole { border-left: 3px solid var(--border); padding-left: 14px; }
.subrole h4 { margin: 0 0 4px; font-size: 1rem; display: flex; flex-wrap: wrap; gap: 4px 10px; align-items: baseline; }
.sub-when { font-family: "JetBrains Mono", ui-monospace, monospace; font-size: .8rem; font-weight: 500; color: var(--muted); }
.subrole p { margin: 0; }

/* Skills */
.skill-grid { display: grid; gap: 20px; grid-template-columns: 1fr; margin-top: 20px; }
@media (min-width: 720px) { .skill-grid { grid-template-columns: repeat(3, 1fr); } }
.skill-grid h3 { font-size: 1rem; margin: 0; }
.two-col { display: grid; gap: 24px; grid-template-columns: 1fr; margin-top: 40px; }
@media (min-width: 720px) { .two-col { grid-template-columns: 1fr 1fr; } }
.plain { padding-left: 18px; margin: 8px 0 0; }
.plain li { margin: 4px 0; }

.contact { text-align: left; }
.footer { padding: 28px 0; color: var(--muted); font-size: .88rem; border-top: 1px solid var(--border); }