:root {
  --bg: #f7f6f2; --surface: #ffffff; --ink: #16181d; --muted: #5d636f; --line: #e4e2da;
  --accent: #1f6f4a; --accent-ink: #ffffff; --accent-soft: #e3f1e9; --warn: #9a5b00;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --radius: 14px; --max: 1080px;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0f1113; --surface: #171a1d; --ink: #eceae4; --muted: #a0a6b0; --line: #262a2f;
          --accent: #4cc38a; --accent-ink: #0b1a12; --accent-soft: #15271e; --warn: #f0b35a; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.6 var(--sans); }
a { color: var(--accent); text-underline-offset: 3px; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 16px; }
header.top { display: flex; justify-content: space-between; align-items: center; padding: 18px 0; }
.logo { font-family: var(--mono); font-weight: 700; color: var(--ink); text-decoration: none; letter-spacing: -.02em; }
.logo span { color: var(--accent); }
nav a { margin-left: 18px; color: var(--muted); text-decoration: none; font-size: 15px; }
nav a:hover { color: var(--ink); }
.hero { padding: 56px 0 32px; }
.eyebrow { font-family: var(--mono); font-size: 13px; color: var(--accent); text-transform: uppercase; letter-spacing: .08em; }
h1 { font-size: clamp(34px, 6vw, 60px); line-height: 1.05; letter-spacing: -.03em; margin: 12px 0 18px; max-width: 16ch; }
h2 { font-size: clamp(24px, 3.4vw, 34px); letter-spacing: -.02em; line-height: 1.15; margin: 0 0 14px; }
h3 { font-size: 18px; margin: 0 0 6px; }
.lede { font-size: clamp(17px, 2.2vw, 20px); color: var(--muted); max-width: 60ch; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.btn { display: inline-block; padding: 13px 20px; border-radius: 999px; font-weight: 600; text-decoration: none; border: 1px solid var(--line); color: var(--ink); background: var(--surface); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn:hover { filter: brightness(1.05); }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; margin: 36px 0 10px; }
.stat { background: var(--surface); padding: 18px; }
.stat .k { font-size: 13px; color: var(--muted); }
.stat .v { font-family: var(--mono); font-size: 26px; font-weight: 700; letter-spacing: -.02em; }
.small { font-size: 13px; color: var(--muted); }
.bar { height: 8px; background: var(--line); border-radius: 99px; overflow: hidden; margin-top: 10px; }
.bar i { display: block; height: 100%; background: var(--accent); }
section { padding: 48px 0; border-top: 1px solid var(--line); }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(185px, 1fr)); gap: 14px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.card .role { font-family: var(--mono); font-size: 12px; color: var(--accent); }
.card p { margin: 6px 0 0; color: var(--muted); font-size: 15px; }
ul.check { list-style: none; padding: 0; margin: 0; }
ul.check li { padding: 8px 0 8px 28px; position: relative; border-bottom: 1px dashed var(--line); }
ul.check li::before { content: "✓"; position: absolute; left: 4px; color: var(--accent); font-weight: 700; }
.two { display: grid; grid-template-columns: 1.2fr 1fr; gap: 28px; align-items: start; }
.price { font-family: var(--mono); font-size: 44px; font-weight: 700; }
.price s { color: var(--muted); font-size: 22px; margin-left: 8px; }
pre, code { font-family: var(--mono); font-size: 14px; }
pre { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 14px; overflow-x: auto; }
details { border-bottom: 1px solid var(--line); padding: 14px 0; }
summary { cursor: pointer; font-weight: 600; }
details p { color: var(--muted); margin: 8px 0 0; }
.journal h2 { font-size: 18px; font-family: var(--mono); margin-top: 28px; }
.prose { max-width: 70ch; }
.prose, .journal { overflow-wrap: anywhere; }
.prose pre { overflow-x: auto; }
.steps { padding-left: 1.3em; max-width: 70ch; }
.steps li { margin: 10px 0; }
.prose img { max-width: 100%; }
.diagram svg { width: 100%; height: auto; display: block; }
.diagram .diagram-narrow { display: none; }
footer { padding: 36px 0 60px; color: var(--muted); font-size: 14px; border-top: 1px solid var(--line); }
@media (max-width: 760px) {
  .stats { grid-template-columns: repeat(2, 1fr); }
  .two { grid-template-columns: 1fr; }
  nav a { margin-left: 12px; }
  nav a.hide-sm { display: none; }
  .diagram .diagram-wide { display: none; }
  .diagram .diagram-narrow { display: block; }
}