:root {
  --bg: #fafaf8;
  --surface: #ffffff;
  --text: #1c2025;
  --muted: #5b6470;
  --border: #e3e5e8;
  --accent: #1f5f8b;
  --accent-contrast: #ffffff;
  --tag-bg: #eef3f7;
  --max: 920px;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14171a;
    --surface: #1c2024;
    --text: #e9ecef;
    --muted: #9aa4af;
    --border: #2b3137;
    --accent: #6fb3e0;
    --accent-contrast: #0e1316;
    --tag-bg: #232a30;
  }
}

:root[data-theme="dark"] {
  --bg: #14171a;
  --surface: #1c2024;
  --text: #e9ecef;
  --muted: #9aa4af;
  --border: #2b3137;
  --accent: #6fb3e0;
  --accent-contrast: #0e1316;
  --tag-bg: #232a30;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 72px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
}

a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }

:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

.skip-link {
  position: absolute; left: 16px; top: -60px;
  background: var(--accent); color: var(--accent-contrast);
  padding: 8px 14px; border-radius: 6px; z-index: 20;
}
.skip-link:focus { top: 12px; }

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

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 56px; }
.brand { font-weight: 700; color: var(--text); text-decoration: none; white-space: nowrap; }
nav ul { list-style: none; display: flex; gap: 18px; margin: 0; padding: 0; flex-wrap: wrap; }
nav a { color: var(--muted); text-decoration: none; font-size: 0.95rem; }
nav a:hover { color: var(--text); }
.theme-toggle {
  background: none; border: 1px solid var(--border); color: var(--text);
  border-radius: 8px; padding: 6px 10px; cursor: pointer; font: inherit; font-size: 0.9rem;
}

/* Sections */
section { padding: 56px 0; border-bottom: 1px solid var(--border); }
section:last-of-type { border-bottom: none; }
h1, h2, h3 { line-height: 1.2; margin: 0 0 0.5em; }
h1 { font-size: clamp(1.8rem, 4.5vw, 2.4rem); letter-spacing: -0.02em; }
h2 { font-size: 1.6rem; margin-bottom: 1em; }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1em; }

.eyebrow { font-family: var(--mono); font-size: 0.85rem; color: var(--muted); margin-bottom: 12px; }

/* Hero */
.hero { padding: 48px 0 36px; }
.hero .headline { font-size: clamp(1rem, 2.2vw, 1.15rem); color: var(--muted); max-width: 40em; margin-bottom: 20px; }
.button-row { display: flex; flex-wrap: wrap; gap: 10px; }
.btn {
  display: inline-block; padding: 6px 14px; border-radius: 8px;
  border: 1px solid var(--accent); text-decoration: none; font-weight: 600; font-size: 0.9rem;
}
.btn.primary { background: var(--accent); color: var(--accent-contrast); }
.btn.secondary { color: var(--accent); }

/* Themes list */
.themes { display: grid; gap: 14px; padding: 0; list-style: none; margin: 24px 0 0; }
.themes li { padding-left: 16px; border-left: 3px solid var(--accent); }

/* Impact */
.impact-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 14px; }
.stat { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 18px; }
.stat .num { font-size: 1.9rem; font-weight: 700; color: var(--accent); line-height: 1.1; }
.stat .label { color: var(--muted); font-size: 0.95rem; margin-top: 6px; }

/* Cards */
.subhead { font-family: var(--mono); font-size: 0.85rem; color: var(--muted); margin: 32px 0 14px; text-transform: uppercase; letter-spacing: 0.04em; }
.subhead:first-of-type { margin-top: 0; }
.cards { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 380px), 1fr)); }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 22px; }
.card .outcome { font-weight: 600; }
.card p:last-child { margin-bottom: 0; }
.status { font-family: var(--mono); font-size: 0.8rem; color: var(--muted); }

.tags { display: flex; flex-wrap: wrap; gap: 6px; list-style: none; padding: 0; margin: 14px 0 0; }
.tags li { font-family: var(--mono); font-size: 0.78rem; background: var(--tag-bg); border-radius: 6px; padding: 3px 8px; }

/* Flow diagram */
.flow { list-style: none; display: flex; flex-wrap: wrap; align-items: center; gap: 6px 4px; padding: 0; margin: 14px 0 0; font-size: 0.82rem; }
.flow li { background: var(--tag-bg); border: 1px solid var(--border); border-radius: 6px; padding: 4px 8px; }
.flow li + li::before { content: "\2192"; margin-right: 8px; color: var(--accent); font-weight: 700; }
.flow li + li { border: 1px solid var(--border); }

/* Timeline */
.timeline { list-style: none; margin: 0; padding: 0; }
.job { position: relative; padding: 0 0 36px 28px; border-left: 2px solid var(--border); margin-left: 6px; }
.job::before { content: ""; position: absolute; left: -7px; top: 6px; width: 12px; height: 12px; border-radius: 50%; background: var(--accent); }
.job:last-child { padding-bottom: 0; }
.job .dates { font-family: var(--mono); font-size: 0.85rem; color: var(--muted); }
.job .org { color: var(--muted); margin-bottom: 10px; }
.job ul { margin: 0; padding-left: 1.1em; }
.job li { margin-bottom: 6px; }

/* Skills */
.skill-groups { display: grid; gap: 22px; }
.skill-groups h3 { font-size: 1rem; margin-bottom: 8px; }
.skill-groups .tags { margin-top: 0; }

/* Footer */
footer { padding: 32px 0 48px; color: var(--muted); font-size: 0.9rem; }

@media (max-width: 640px) {
  .site-header { position: static; }
  .site-header .wrap { flex-wrap: wrap; padding-top: 8px; padding-bottom: 8px; }
  nav ul { gap: 12px; }
  section { padding: 40px 0; }
  .hero { padding: 32px 0 28px; }
}

@media print {
  .site-header, .theme-toggle, .button-row, .skip-link { display: none; }
  :root { --bg: #fff; --surface: #fff; --text: #000; --muted: #333; --border: #bbb; --accent: #000; }
  body { font-size: 11pt; }
  section { padding: 16px 0; break-inside: avoid-page; }
  .card, .stat { break-inside: avoid; }
  a { color: #000; }
}