:root {
  --bg: #0b0d10;
  --bg2: #12151c;
  --ink: #e8ecf4;
  --muted: #9aa3b5;
  --accent: #7ee0c3;
  --accent2: #c9a6ff;
  --warn: #f0b429;
  --line: #1e2430;
  --code: #0f131a;
  --door-a: #7ee0c3;
  --door-h: #9bb0ff;
  --font: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, Consolas, monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: radial-gradient(1200px 600px at 10% -10%, #1a2233 0%, var(--bg) 55%);
  color: var(--ink); font-family: var(--font); line-height: 1.55;
  min-height: 100vh;
}
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: #b7ffe9; }
header.site {
  border-bottom: 1px solid var(--line);
  padding: 1rem 1.25rem;
  display: flex; flex-wrap: wrap; gap: .75rem 1.5rem; align-items: baseline;
  background: rgba(11,13,16,.85); backdrop-filter: blur(8px);
  position: sticky; top: 0; z-index: 20;
}
header.site .mark { font-weight: 650; letter-spacing: .04em; color: var(--accent2); }
header.site nav { display: flex; flex-wrap: wrap; gap: .75rem 1rem; font-size: .92rem; }
header.site nav a { color: var(--muted); }
header.site nav a:hover { color: var(--ink); }
main { max-width: 920px; margin: 0 auto; padding: 2rem 1.25rem 4rem; }
.wide { max-width: 1100px; }
h1,h2,h3 { line-height: 1.2; font-weight: 650; }
h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); margin: 0 0 .75rem; }
h2 { margin-top: 2.2rem; border-bottom: 1px solid var(--line); padding-bottom: .35rem; color: #d7dff0; }
h3 { color: var(--accent); }
.lede { font-size: 1.15rem; color: var(--muted); max-width: 42rem; }
.one-liner {
  font-family: var(--mono); font-size: .95rem; color: var(--accent);
  border-left: 3px solid var(--accent2); padding: .6rem 1rem; background: var(--bg2);
  margin: 1.25rem 0;
}
.doors {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem; margin: 2rem 0;
}
.door {
  display: block; padding: 1.25rem 1.35rem; border: 1px solid var(--line);
  border-radius: 14px; background: linear-gradient(160deg, #151a24, #0e1117);
  color: inherit; text-decoration: none; transition: border-color .15s, transform .15s;
}
.door:hover { transform: translateY(-2px); border-color: #3a455c; }
.door.agent { box-shadow: inset 0 0 0 1px rgba(126,224,195,.15); }
.door.human { box-shadow: inset 0 0 0 1px rgba(155,176,255,.15); }
.door .tag { font-family: var(--mono); font-size: .75rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }
.door.agent .tag { color: var(--door-a); }
.door.human .tag { color: var(--door-h); }
.door h2 { margin: .4rem 0 .5rem; border: 0; font-size: 1.25rem; }
.door p { margin: 0; color: var(--muted); font-size: .95rem; }
.dense p, .dense li { font-size: 1.02rem; }
.thin p { font-size: 1rem; max-width: 36rem; }
pre, code { font-family: var(--mono); }
pre {
  background: var(--code); border: 1px solid var(--line); border-radius: 10px;
  padding: 1rem 1.1rem; overflow-x: auto; font-size: .82rem; line-height: 1.45;
}
code { font-size: .88em; color: #d2e7ff; }
table { width: 100%; border-collapse: collapse; font-size: .92rem; margin: 1rem 0; }
th, td { border: 1px solid var(--line); padding: .45rem .6rem; text-align: left; }
th { background: #161b25; color: var(--accent2); }
.meta { color: var(--muted); font-size: .85rem; }
.chip {
  display: inline-block; font-family: var(--mono); font-size: .72rem;
  border: 1px solid var(--line); border-radius: 999px; padding: .15rem .55rem;
  color: var(--muted); margin-right: .35rem;
}
.shadow-line { color: var(--muted); font-style: italic; margin-top: 2rem; }
footer.site {
  max-width: 920px; margin: 0 auto; padding: 1rem 1.25rem 3rem;
  color: var(--muted); font-size: .85rem; border-top: 1px solid var(--line);
}
.forms-grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(220px,1fr)); }
.form-card {
  border: 1px dashed #2a3344; border-radius: 12px; padding: 1rem; background: #10141c;
}
.form-card h3 { margin-top: 0; font-size: 1rem; }
.lacuna { border-color: #5a3a20; background: #17120e; }
blockquote {
  margin: 1rem 0; padding: .75rem 1rem; border-left: 3px solid var(--warn);
  background: #16130c; color: #e6d7a8;
}
ul.toc { columns: 2; gap: 2rem; }
@media (max-width: 640px) { ul.toc { columns: 1; } }