:root {
  --bg: #f7f6f2;
  --surface: #ffffff;
  --text: #1d1f24;
  --muted: #5d6270;
  --line: #e2e0d8;
  --accent: #2f6f5e;
  --accent-soft: #e3efe9;
  --human: #b5622d;
  --ai: #2f6f5e;
  --radius: 14px;
  --max: 720px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --surface: #1c1f25;
    --text: #e8e6e1;
    --muted: #9aa0ab;
    --line: #2b2f37;
    --accent: #6cc3a7;
    --accent-soft: #1f3530;
    --human: #e3955f;
    --ai: #6cc3a7;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.65 "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
}
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }

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

header.site {
  padding: 28px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 650; letter-spacing: -0.01em; color: var(--text); text-decoration: none;
  white-space: nowrap;
}
.brand svg { width: 30px; height: 30px; }
nav a { color: var(--muted); text-decoration: none; margin-left: 20px; font-size: 15px; }
nav a:hover { color: var(--text); }

.hero { padding: 56px 0 40px; }
.hero h1 {
  font-size: clamp(34px, 6vw, 52px);
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin: 0 0 18px;
}
.hero h1 .h { color: var(--human); }
.hero h1 .a { color: var(--ai); }
.hero p { font-size: 19px; color: var(--muted); margin: 0; max-width: 34em; }

h2 { font-size: 15px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); margin: 48px 0 16px; }

.card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 24px;
  color: var(--text);
  text-decoration: none;
  transition: border-color .15s, transform .15s;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card h3 { margin: 0 0 6px; font-size: 20px; letter-spacing: -0.01em; }
.card p { margin: 0; color: var(--muted); }
.tags { margin-top: 14px; display: flex; flex-wrap: wrap; gap: 8px; }
.tag { font-size: 13px; padding: 2px 10px; border-radius: 99px; background: var(--accent-soft); color: var(--accent); }
.card + .card { margin-top: 14px; }
.card.soon { border-style: dashed; background: transparent; }
.card.soon:hover { transform: none; border-color: var(--line); }

.principles { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; }
.principles div { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; }
.principles strong { display: block; margin-bottom: 4px; }
.principles span { color: var(--muted); font-size: 15px; }

article h1 { font-size: clamp(30px, 5vw, 42px); line-height: 1.15; letter-spacing: -0.025em; margin: 40px 0 10px; }
article .lede { font-size: 19px; color: var(--muted); margin: 0 0 32px; }
article h2 { text-transform: none; letter-spacing: -0.01em; font-size: 24px; color: var(--text); margin: 44px 0 12px; }
article li { margin: 6px 0; }
article code { font: 14px/1.5 ui-monospace, "SF Mono", Menlo, monospace; background: var(--accent-soft); padding: 1px 6px; border-radius: 6px; }
.meta { color: var(--muted); font-size: 15px; }

.flow { display: flex; flex-direction: column; gap: 0; margin: 24px 0; }
.flow .step { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px; }
.flow .step b { display: block; }
.flow .step span { color: var(--muted); font-size: 15px; }
.flow .arrow { text-align: center; color: var(--muted); line-height: 1; padding: 6px 0; font-size: 18px; }

table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 15px; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; }

footer.site { margin: 72px 0 40px; padding-top: 24px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }

@media (max-width: 520px) {
  body { font-size: 16px; }
  nav a { margin-left: 14px; }
  .hero { padding: 32px 0 24px; }
  table { font-size: 14px; }
}