@import url('https://fonts.googleapis.com/css2?family=Geist:wght@400;500;600&display=swap');

:root {
  color-scheme: light;
  --bg: #f3f4f5;
  --paper: #fff;
  --ink: #1d2125;
  --muted: #5c6570;
  --line: #e0e3e7;
  --accent: #2f5d50;
  --tray: #1e2b29;
  --tray-ink: #eef0f2;
  --tray-muted: #a9b1bb;
  --tray-line: #52615e;
}
* { box-sizing: border-box; }
html { scroll-padding-top: 100px; -webkit-text-size-adjust: 100%; scrollbar-color: var(--muted) var(--bg); }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 17px/1.6 'Geist', 'Segoe UI', sans-serif; -webkit-font-smoothing: antialiased; }
::selection { background: #d1e2db; color: var(--ink); }
a { color: inherit; text-underline-offset: 4px; text-decoration-thickness: 1px; }
a:hover { color: var(--accent); }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 5px; border-radius: 4px; }
.wrap { max-width: 1160px; padding: 0 40px; margin: 0 auto; }
.skip { position: absolute; left: 16px; top: -100px; z-index: 30; background: var(--paper); padding: 12px 16px; }
.skip:focus { top: 12px; }
header { position: sticky; top: 0; z-index: 20; background: var(--bg); }
.bar { display: flex; align-items: center; justify-content: space-between; min-height: 76px; gap: 24px; }
.brand { font-size: 18px; font-weight: 600; letter-spacing: -.02em; text-decoration: none; }
nav { display: flex; align-items: center; gap: 6px; font-size: 14px; font-weight: 500; }
nav a { padding: 10px 14px; color: var(--muted); text-decoration: none; }
nav .nav-action { margin-left: 10px; background: var(--ink); color: var(--paper); border-radius: 12px; padding: 10px 16px; }
nav .nav-action:hover { background: var(--accent); }
h1, h2, h3 { font-weight: 500; text-wrap: balance; }
h1 { max-width: 15em; font-size: clamp(42px, 5.4vw, 66px); line-height: 1.04; letter-spacing: -.035em; margin: 0 0 28px; }
h2 { font-size: clamp(30px, 3.4vw, 44px); line-height: 1.1; letter-spacing: -.028em; margin: 0 0 22px; }
h3 { font-size: 21px; line-height: 1.25; letter-spacing: -.015em; margin: 0 0 12px; }
p { color: var(--muted); margin: 0 0 20px; text-wrap: pretty; max-width: 70ch; }
.lede { font-size: 20px; line-height: 1.5; max-width: 34em; margin-bottom: 24px; }
.intro { padding-top: 88px; padding-bottom: 56px; }
.project-meta { font-size: 14px; margin-bottom: 20px; }
.text-link { display: inline-block; padding: 6px 0; font-size: 15px; }
section { padding: 110px 0; }
.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 72px; }
.column-title { color: var(--muted); font-size: 14px; line-height: 1.6; letter-spacing: 0; margin: 0 0 18px; }
.capability { padding: 26px 0; border-top: 1px solid var(--line); }
.capability p { font-size: 16px; margin-bottom: 4px; }
.dark { background: var(--tray); color: var(--tray-ink); margin: 0 clamp(8px, 2.2vw, 28px); border-radius: 28px; padding: 96px 0; }
.dark p, .dark figcaption { color: var(--tray-muted); }
.dark a:hover { color: var(--tray-ink); }
.dark :focus-visible { outline-color: #9cc2b5; }
figure { margin: 40px 0 0; }
video { display: block; width: 100%; aspect-ratio: 16 / 9; background: #101816; color: var(--tray-ink); border-radius: 14px; }
figcaption { font-size: 13px; margin-top: 12px; }
details { margin-top: 24px; border-top: 1px solid var(--tray-line); padding-top: 16px; }
summary { cursor: pointer; font-size: 15px; font-weight: 500; padding: 8px 0; width: fit-content; }
.transcript p { font-size: 15px; margin: 12px 0; }
.artifact-list article { border-top: 1px solid var(--line); padding: 24px 0; }
.artifact-list h3 { font-size: 20px; }
.artifact-list p { font-size: 15px; margin: 0; }
.artifact-list .format-links { margin-top: 12px; }
audio { display: block; width: 100%; margin-top: 16px; }
.lesson-player { border-top: 0; padding-top: 0; margin-top: 12px; }
.lesson-player video { margin-top: 12px; }
.evidence { padding-top: 0; padding-bottom: 64px; }
.evidence .wrap { padding-top: 56px; border-top: 1px solid var(--line); }
.evidence h2 { font-size: 30px; }
.evidence p { font-size: 16px; }
.evidence-links { list-style: none; padding: 0; margin: 0; align-self: center; }
.evidence-links a { display: inline-block; padding: 10px 0; font-size: 15px; }
code { font-variant-numeric: tabular-nums; }
footer { padding: 28px 0 40px; font-size: 13px; color: var(--muted); }
footer .wrap { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
@media (max-width: 980px) {
  .wrap { padding-left: 28px; padding-right: 28px; }
  .split { gap: 40px; }
}
@media (max-width: 700px) {
  body { font-size: 16px; }
  .wrap { padding-left: 20px; padding-right: 20px; }
  .bar { min-height: 68px; gap: 12px; }
  nav > a:not(.nav-action) { display: none; }
  nav .nav-action { margin: 0; font-size: 13px; }
  h1 { font-size: 36px; letter-spacing: -.032em; }
  .lede { font-size: 18px; }
  .intro { padding-top: 52px; padding-bottom: 28px; }
  section { padding: 64px 0; }
  .split { grid-template-columns: 1fr; gap: 28px; }
  .dark { padding: 56px 0; border-radius: 22px; }
  .evidence { padding-bottom: 28px; }
  .evidence .wrap { padding-top: 40px; }
  figure { margin-top: 28px; }
}
@media print {
  header, .skip, video, footer { display: none; }
  body, .dark { background: white; color: black; }
  .dark p, .dark figcaption { color: black; }
  section, .dark, .intro { padding: 24px 0; }
  .split { display: block; }
}