/* ============================================================
   SkillSenz.ai — OIP protocol home / reference registry
   Infrastructure tone: neutral ink, generous whitespace,
   monospace accents. No hype. Pure HTML/CSS, no JS.
   ============================================================ */

:root{
  --bg:        #ffffff;
  --bg-soft:   #f6f7f9;
  --bg-code:   #f3f4f6;
  --ink:       #14181f;
  --ink-soft:  #3b4350;
  --ink-faint: #6b7480;
  --line:      #e4e7ec;
  --line-strong:#cdd3da;
  --accent:    #1f5fae;   /* the ".ai" blue, restrained */
  --accent-deep:#163f73;
  --ok:        #2f7d4f;
  --warn-bg:   #fff6e6;
  --warn-ink:  #7a5310;
  --warn-line: #e8d29a;
  --chip-bg:   #eef3fb;
  --chip-ink:  #1f5fae;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --maxw: 880px;
}

*{ box-sizing: border-box; }
html{ -webkit-text-size-adjust:100%; }
body{
  margin:0; background:var(--bg); color:var(--ink);
  font-family:var(--sans); font-size:17px; line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
.wrap{ max-width:var(--maxw); margin:0 auto; padding:0 22px; }

a{ color:var(--accent); text-decoration:none; }
a:hover{ text-decoration:underline; }

.skip{ position:absolute; left:-999px; }
.skip:focus{ left:8px; top:8px; background:#fff; padding:8px 12px; border:1px solid var(--line-strong); border-radius:8px; z-index:10; }

/* ---------- header ---------- */
.site-header{ border-bottom:1px solid var(--line); background:var(--bg); position:sticky; top:0; z-index:5; }
.header-inner{ display:flex; align-items:center; gap:18px; min-height:60px; flex-wrap:wrap; }
.brand{ font-weight:700; font-size:18px; color:var(--ink); letter-spacing:-.01em; }
.brand:hover{ text-decoration:none; }
.brand-ai{ color:var(--accent); }
.nav{ display:flex; gap:16px; flex-wrap:wrap; margin-left:6px; }
.nav a{ color:var(--ink-soft); font-size:15px; }
.nav a:hover{ color:var(--accent); text-decoration:none; }
.chip{
  margin-left:auto; font-family:var(--mono); font-size:11px; letter-spacing:.04em;
  text-transform:uppercase; color:var(--chip-ink); background:var(--chip-bg);
  border:1px solid #d7e2f4; padding:4px 9px; border-radius:999px; white-space:nowrap;
}

/* ---------- main / typography ---------- */
main{ padding:42px 0 16px; overflow-x:clip; }
h1{ font-size:34px; line-height:1.15; letter-spacing:-.02em; margin:0 0 14px; }
h2{ font-size:23px; letter-spacing:-.01em; margin:38px 0 12px; padding-top:6px; }
h3{ font-size:18px; margin:26px 0 8px; }
p{ margin:0 0 16px; color:var(--ink-soft); }
.lead{ font-size:20px; color:var(--ink); }
ul,ol{ color:var(--ink-soft); padding-left:22px; }
li{ margin:6px 0; }
hr{ border:none; border-top:1px solid var(--line); margin:34px 0; }
strong{ color:var(--ink); }
small,.muted{ color:var(--ink-faint); font-size:14px; }

code{ font-family:var(--mono); font-size:.88em; background:var(--bg-code); padding:.12em .38em; border-radius:5px; }
pre{ background:var(--bg-code); border:1px solid var(--line); border-radius:10px; padding:16px; overflow:auto; font-size:13.5px; line-height:1.55; }
pre code{ background:none; padding:0; }

table{ border-collapse:collapse; width:100%; max-width:100%; margin:18px 0; font-size:15px; display:block; overflow-x:auto; -webkit-overflow-scrolling:touch; }
th,td{ border:1px solid var(--line); padding:8px 11px; text-align:left; vertical-align:top; }
th{ background:var(--bg-soft); font-weight:600; color:var(--ink); }

blockquote{ margin:18px 0; padding:2px 16px; border-left:3px solid var(--line-strong); color:var(--ink-soft); }

/* ---------- hero ---------- */
.hero{ padding:14px 0 8px; }
.hero h1{ font-size:40px; }
.eyebrow{ font-family:var(--mono); font-size:12px; letter-spacing:.08em; text-transform:uppercase; color:var(--ink-faint); margin:0 0 12px; }

/* ---------- buttons ---------- */
.btn-row{ display:flex; gap:12px; flex-wrap:wrap; margin:22px 0 8px; }
.btn{ display:inline-block; padding:11px 18px; border-radius:9px; font-size:15px; font-weight:600; border:1px solid var(--accent); }
.btn-primary{ background:var(--accent); color:#fff; }
.btn-primary:hover{ background:var(--accent-deep); text-decoration:none; }
.btn-ghost{ background:#fff; color:var(--accent); }
.btn-ghost:hover{ background:var(--bg-soft); text-decoration:none; }

/* ---------- cards ---------- */
.cards{ display:grid; grid-template-columns:repeat(auto-fit,minmax(220px,1fr)); gap:14px; margin:20px 0; }
.card{ border:1px solid var(--line); border-radius:12px; padding:16px 16px; background:var(--bg); }
.card h3{ margin:0 0 6px; font-size:16px; }
.card p{ margin:0; font-size:15px; }

/* ---------- status strip ---------- */
.status{ background:var(--bg-soft); border:1px solid var(--line); border-radius:12px; padding:16px 18px; margin:26px 0; }
.status p{ margin:0; font-size:15px; }

/* ---------- trust badge (band + confidence + sample-size warning, always) ---------- */
.trust-badge{ display:flex; flex-wrap:wrap; align-items:center; gap:8px; margin:10px 0; }
.tb-band{ font-family:var(--mono); font-size:12px; letter-spacing:.04em; text-transform:uppercase; padding:4px 10px; border-radius:999px; font-weight:600; }
.tb-unverified{ background:#f2f3f5; color:#5b636e; }
.tb-experimental{ background:#fdf0e6; color:#8a4b14; }
.tb-promising{ background:#eaf2fb; color:#1f5fae; }
.tb-validated{ background:#e9f5ee; color:#2f7d4f; }
.tb-trusted{ background:#e6f4f1; color:#127068; }
.tb-proven{ background:#eceaf9; color:#4634a8; }
.tb-meta{ font-size:13px; color:var(--ink-soft); font-family:var(--mono); }
.tb-warn{ font-size:13px; color:var(--warn-ink); background:var(--warn-bg); border:1px solid var(--warn-line); padding:3px 9px; border-radius:999px; }

/* ---------- object preview ---------- */
.object{ border:1px solid var(--line); border-radius:14px; padding:20px; margin:18px 0; background:var(--bg); }
.object h2{ margin:0 0 4px; padding-top:0; }
.object .obj-sub{ font-size:14px; color:var(--ink-faint); margin:0 0 12px; }
.kv{ display:grid; grid-template-columns:160px 1fr; gap:6px 14px; font-size:14px; margin:14px 0; }
.kv dt{ color:var(--ink-faint); font-family:var(--mono); font-size:12.5px; }
.kv dd{ margin:0; color:var(--ink-soft); }
.json-links{ display:flex; gap:10px; flex-wrap:wrap; margin-top:14px; }
.json-links a{ font-family:var(--mono); font-size:13px; }

/* ---------- TOC (pandoc pages) ---------- */
#TOC{ background:var(--bg-soft); border:1px solid var(--line); border-radius:12px; padding:14px 18px 14px 36px; margin:0 0 30px; font-size:14.5px; }
#TOC ul{ margin:4px 0; }
#TOC a{ color:var(--ink-soft); }
.doc-note{ background:var(--bg-soft); border:1px solid var(--line); border-left:3px solid var(--accent); border-radius:8px; padding:12px 16px; font-size:14.5px; margin:0 0 26px; }
.doc-note code{ background:#e8edf4; }

/* ---------- footer ---------- */
.site-footer{ border-top:1px solid var(--line); margin-top:48px; padding:26px 0 40px; background:var(--bg-soft); }
.site-footer .framing{ color:var(--ink); font-size:15px; margin:0 0 6px; }
.site-footer .muted{ margin:0; }

/* ---------- responsive ---------- */
@media (max-width:640px){
  body{ font-size:16px; }
  .hero h1{ font-size:30px; }
  h1{ font-size:27px; }
  .chip{ margin-left:0; order:3; }
  .header-inner{ gap:10px 14px; }
  .kv{ grid-template-columns:1fr; }
  .kv dt{ margin-top:8px; }
}