:root {
  color-scheme: light;
  --surface: #fcfcfb;
  --surface-2: #f2f1ed;
  --text: #0b0b0b;
  --text-2: #52514e;
  --border: #dddcd6;
  --accent: #2a78d6;
  --accent-ink: #1f5fae; /* link text: 6.2:1 on --surface */
  --button: #1f5fae;     /* white text on it: 6.4:1 (WCAG AA) */
}
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --surface: #1a1a19;
    --surface-2: #242423;
    --text: #f0efec;
    --text-2: #c3c2b7;
    --border: #3a3a37;
    --accent: #3987e5;
    --accent-ink: #8bb8f0; /* 8.5:1 on --surface */
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--surface);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--accent-ink); }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 20px; }

.skip { position: absolute; left: -999px; }
.skip:focus { left: 8px; top: 8px; background: var(--surface); padding: 8px; z-index: 1; }

.hero { border-bottom: 1px solid var(--border); padding: 56px 0 32px; }
.hero h1 { margin: 0; font-size: 2.4rem; line-height: 1.2; }
.headline { margin: 6px 0 16px; color: var(--text-2); font-weight: 600; }
.intro { max-width: 70ch; margin: 0 0 16px; }
.contact, .nav-list, .stack { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.contact a {
  display: inline-block; padding: 6px 14px; border: 1px solid var(--border);
  border-radius: 999px; text-decoration: none; font-weight: 600;
}

nav { padding: 28px 0 8px; }
.nav-title { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-2); margin: 0 0 10px; }
.nav-list a { font-size: 0.9rem; }
.nav-list li:not(:last-child)::after { content: "·"; margin-left: 8px; color: var(--text-2); }

.card {
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: 32px;
  align-items: start; padding: 40px 0; border-bottom: 1px solid var(--border);
  scroll-margin-top: 16px;
}
.card h2 { margin: 0 0 8px; font-size: 1.5rem; line-height: 1.25; }
.card h2 a { color: var(--text); text-decoration: none; }
.card h2 a:hover { text-decoration: underline; }
.card p { margin: 0 0 12px; }
.kind { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-2); margin-bottom: 4px !important; }
.question { color: var(--text-2); font-style: italic; }

.stat { margin: 16px 0; padding: 12px 16px; background: var(--surface-2); border-radius: 8px; }
.stat-value { display: block; font-size: 2.4rem; font-weight: 700; line-height: 1.1; font-variant-numeric: tabular-nums; }
.stat-label { display: block; color: var(--text-2); }
.so-what { border-left: 3px solid var(--accent); padding-left: 12px; }

.stack { margin: 12px 0; }
.stack li { font-size: 0.8rem; padding: 2px 10px; border-radius: 999px; background: var(--surface-2); color: var(--text-2); }
.meta { font-size: 0.85rem; color: var(--text-2); }
.nowrap { white-space: nowrap; }
.button {
  display: inline-block; padding: 8px 16px; border-radius: 6px; font-weight: 600;
  background: var(--button); color: #fff; text-decoration: none;
}
.button:hover { filter: brightness(1.1); }

/* Charts are white-background PNGs, so they sit on a white panel in both themes. */
.card-chart { margin: 0; background: #fff; border: 1px solid var(--border); border-radius: 8px; padding: 12px; }
.card-chart img { display: block; width: 100%; height: auto; }

footer { padding: 32px 20px 48px; color: var(--text-2); font-size: 0.85rem; }

@media (max-width: 820px) {
  .card { grid-template-columns: 1fr; gap: 20px; }
  .hero { padding-top: 36px; }
  .hero h1 { font-size: 2rem; }
}