/* forth-ai-harness docs — dark developer-technical theme */

:root {
  /* near-black base, cool slate steps */
  --bg: #0a0d12;
  --bg-1: #0f1319;
  --bg-2: #151b23;
  --bg-3: #1c242e;
  --line: #232c38;
  --line-2: #2e3a48;

  --ink: #e6edf3;
  --ink-2: #aeb9c6;
  --ink-3: #7c8a9a;
  --ink-4: #57636f;

  /* accents */
  --teal: #34e0c4;
  --teal-dim: #1c8d7c;
  --green: #5fe08a;
  --amber: #f0c674;
  --violet: #9d8cff;
  --pink: #ff8ab3;

  --po: #6cb6ff; /* PO blue */
  --eng: #5fe08a; /* Eng green */
  --util: #7c8a9a; /* offline/ops grey */

  --radius: 12px;
  --radius-sm: 8px;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --sans: "Inter", system-ui, -apple-system, sans-serif;
  --maxw: 1120px;
  --shadow: 0 1px 0 rgba(255, 255, 255, 0.02) inset, 0 8px 30px rgba(0, 0, 0, 0.4);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  /* subtle grid texture */
  background-image:
    radial-gradient(900px 500px at 78% -8%, rgba(52, 224, 196, 0.07), transparent 60%),
    radial-gradient(700px 400px at 0% 0%, rgba(108, 182, 255, 0.05), transparent 55%);
  background-attachment: fixed;
}

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

code, kbd, .mono { font-family: var(--mono); }

.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 100;
  background: var(--teal); color: #04120f; padding: 8px 14px; border-radius: 0 0 8px 0; font-weight: 600;
}
.skip-link:focus { left: 0; }

/* ---------- topbar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; gap: 16px;
  padding: 12px max(20px, calc((100vw - var(--maxw)) / 2 + 20px));
  background: rgba(10, 13, 18, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 9px; color: var(--ink); font-weight: 600; }
.brand:hover { text-decoration: none; }
.brand-mark { color: var(--teal); font-size: 18px; }
.brand-name { font-family: var(--mono); letter-spacing: -0.02em; }
.brand-ver {
  font-family: var(--mono); font-size: 11px; color: var(--teal);
  border: 1px solid var(--teal-dim); border-radius: 999px; padding: 1px 8px; background: rgba(52, 224, 196, 0.08);
}
.topbar-actions { margin-left: auto; display: flex; align-items: center; gap: 12px; }

.search { position: relative; display: flex; align-items: center; }
.search input {
  width: 280px; max-width: 42vw;
  background: var(--bg-2); border: 1px solid var(--line-2); color: var(--ink);
  border-radius: 999px; padding: 8px 34px 8px 14px; font-size: 13px; font-family: var(--mono);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.search input::placeholder { color: var(--ink-4); }
.search input:focus { outline: none; border-color: var(--teal-dim); box-shadow: 0 0 0 3px rgba(52, 224, 196, 0.12); }
.search kbd {
  position: absolute; right: 8px; font-size: 11px; color: var(--ink-3);
  border: 1px solid var(--line-2); border-radius: 5px; padding: 0 5px; background: var(--bg-1);
}
.ghlink { font-size: 13px; color: var(--ink-2); font-weight: 500; }
.ghlink:hover { color: var(--teal); text-decoration: none; }
.nav-toggle { display: none; background: var(--bg-2); border: 1px solid var(--line-2); color: var(--ink); border-radius: 8px; font-size: 18px; width: 38px; height: 36px; cursor: pointer; }

/* ---------- shell / sidebar ---------- */
.shell {
  display: grid; grid-template-columns: 232px minmax(0, 1fr);
  gap: 40px; max-width: var(--maxw); margin: 0 auto; padding: 0 20px;
}
.sidebar { position: sticky; top: 72px; align-self: start; height: calc(100vh - 84px); padding-top: 28px; display: flex; flex-direction: column; }
.nav-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 2px; }
.nav-item {
  display: flex; align-items: center; justify-content: space-between;
  color: var(--ink-2); font-size: 13.5px; font-weight: 500;
  padding: 7px 12px; border-radius: var(--radius-sm); border-left: 2px solid transparent;
}
.nav-item:hover { background: var(--bg-2); color: var(--ink); text-decoration: none; }
.nav-item.active { background: var(--bg-2); color: var(--teal); border-left-color: var(--teal); }
.nav-count { font-family: var(--mono); font-size: 11px; color: var(--ink-4); }
.sidebar-foot { margin-top: auto; padding: 14px 12px; border-top: 1px solid var(--line); }
.sidebar-foot p { font-size: 12px; color: var(--ink-4); margin: 0; line-height: 1.5; }

/* ---------- content ---------- */
.content { padding: 28px 0 80px; min-width: 0; }
.block { padding: 44px 0; border-top: 1px solid var(--line); }
.block:first-of-type { border-top: none; }
h1 { font-size: clamp(34px, 5vw, 52px); line-height: 1.04; letter-spacing: -0.035em; margin: 6px 0 14px; font-weight: 700; }
h2 { font-size: 25px; letter-spacing: -0.02em; margin: 0 0 6px; font-weight: 650; }
h4 { margin: 0 0 4px; font-size: 14.5px; letter-spacing: -0.01em; }
.arrow { color: var(--teal); }
.block-sub { color: var(--ink-2); margin: 0 0 22px; max-width: 70ch; }
.block-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

/* ---------- hero ---------- */
.hero { padding-top: 36px; }
.eyebrow { font-family: var(--mono); font-size: 12px; letter-spacing: 0.04em; color: var(--teal); text-transform: uppercase; margin: 0; }
.lede { font-size: 17px; color: var(--ink-2); max-width: 62ch; margin: 0 0 26px; }
.hero-cta { display: flex; align-items: stretch; gap: 0; max-width: 520px; }
.install {
  flex: 1; background: var(--bg-1); border: 1px solid var(--line-2); border-right: none;
  border-radius: var(--radius-sm) 0 0 var(--radius-sm); padding: 12px 16px; font-size: 13.5px; color: var(--ink);
  overflow-x: auto; white-space: nowrap;
}
.install::before { content: "$ "; color: var(--teal); }
.copy-btn {
  background: var(--bg-3); border: 1px solid var(--line-2); color: var(--ink-2);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0; padding: 0 16px; font-family: var(--mono); font-size: 12px; cursor: pointer;
  transition: color 0.15s, background 0.15s;
}
.copy-btn:hover { color: var(--teal); background: var(--bg-2); }
.copy-btn.copied { color: #04120f; background: var(--teal); border-color: var(--teal); }

.hero-stats { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.stat { background: var(--bg-1); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 18px; min-width: 104px; }
.stat .num { font-family: var(--mono); font-size: 23px; font-weight: 700; color: var(--teal); line-height: 1; }
.stat .lbl { font-size: 12px; color: var(--ink-3); margin-top: 5px; }

/* ---------- hero roles (you + two cofounders) ---------- */
.hero-roles { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 12px; margin-top: 30px; }
.role-card { background: var(--bg-1); border: 1px solid var(--line); border-top: 2px solid var(--accent, var(--util)); border-radius: var(--radius); padding: 15px 16px; }
.role-head { display: flex; align-items: baseline; gap: 9px; flex-wrap: wrap; }
.role-who { font-family: var(--mono); font-weight: 700; font-size: 15px; color: var(--ink); letter-spacing: -0.01em; }
.role-tag { font-size: 11px; font-weight: 600; color: var(--accent, var(--util)); border: 1px solid var(--line-2); border-radius: 999px; padding: 1px 8px; }
.role-blurb { font-size: 12.5px; color: var(--ink-3); margin: 9px 0 0; line-height: 1.5; }

/* ---------- stage rail ---------- */
.stage-rail { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-bottom: 18px; }
.stage-chip {
  position: relative; text-align: left; cursor: pointer;
  background: var(--bg-1); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 14px 14px 16px; color: var(--ink); transition: border-color 0.15s, transform 0.12s, background 0.15s;
}
.stage-chip:hover { transform: translateY(-2px); border-color: var(--line-2); }
.stage-chip[aria-selected="true"] { border-color: var(--accent); background: var(--bg-2); box-shadow: 0 0 0 1px var(--accent) inset; }
.stage-chip .st-name { font-family: var(--mono); font-weight: 700; letter-spacing: 0.02em; font-size: 14px; }
.stage-chip .st-owner { font-size: 11px; font-weight: 600; padding: 1px 7px; border-radius: 999px; margin-left: 8px; }
.stage-chip .st-blurb { font-size: 12.5px; color: var(--ink-3); margin-top: 9px; line-height: 1.45; }
.stage-chip .st-arrow { position: absolute; right: -8px; top: 50%; transform: translateY(-50%); color: var(--ink-4); font-size: 14px; z-index: 1; }
.stage-chip:last-child .st-arrow { display: none; }
.owner-po { background: rgba(108, 182, 255, 0.16); color: var(--po); }
.owner-eng { background: rgba(95, 224, 138, 0.16); color: var(--eng); }
.owner-codex { background: rgba(157, 140, 255, 0.16); color: var(--violet); }
.owner-util { background: rgba(124, 138, 154, 0.16); color: var(--ink-3); }

.stage-detail { background: var(--bg-1); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; min-height: 64px; }
.stage-detail .sd-head { font-family: var(--mono); font-size: 13px; color: var(--ink-2); margin-bottom: 12px; }
.stage-detail .sd-cmds { display: flex; flex-wrap: wrap; gap: 8px; }
.sd-cmd { font-family: var(--mono); font-size: 13px; background: var(--bg-3); border: 1px solid var(--line-2); border-radius: 999px; padding: 4px 12px; color: var(--ink); }
.sd-cmd:hover { border-color: var(--teal-dim); color: var(--teal); text-decoration: none; }

/* ---------- convergence loop ---------- */
.loop-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.loop-step { position: relative; background: var(--bg-1); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; }
.loop-step .loop-n { font-family: var(--mono); font-size: 12px; color: #04120f; background: var(--teal); width: 22px; height: 22px; border-radius: 6px; display: inline-flex; align-items: center; justify-content: center; font-weight: 700; margin-bottom: 10px; }
.loop-step p { font-size: 13px; color: var(--ink-3); margin: 0; }
.loop-criterion { margin-top: 18px; padding: 16px 18px; background: var(--bg-1); border: 1px dashed var(--line-2); border-radius: var(--radius); font-family: var(--mono); font-size: 13px; color: var(--ink-2); }
.loop-criterion b { color: var(--ink); }
.c-claude { color: var(--po); }
.c-codex { color: var(--violet); }
.c-gate { color: var(--green); }
.loop-note { display: inline-block; margin-top: 8px; font-family: var(--sans); font-size: 12.5px; color: var(--ink-4); }
.loop-note code { color: var(--amber); }

/* ---------- tutorial (newcomer walkthrough) ---------- */
.tutorial { list-style: none; margin: 8px 0 0; padding: 0; }
.tut-step { position: relative; display: grid; grid-template-columns: 34px minmax(0, 1fr); gap: 14px; padding-bottom: 16px; }
.tut-step::before { content: ""; position: absolute; left: 16px; top: 36px; bottom: 0; width: 2px; background: var(--line); }
.tut-step:last-child { padding-bottom: 0; }
.tut-step:last-child::before { display: none; }
.tut-n {
  width: 34px; height: 34px; border-radius: 9px; z-index: 1;
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--mono); font-weight: 700; font-size: 14px;
  color: var(--accent, var(--teal)); background: var(--bg-2); border: 1px solid var(--accent, var(--line-2));
}
.tut-body { background: var(--bg-1); border: 1px solid var(--line); border-left: 3px solid var(--accent, var(--util)); border-radius: var(--radius); padding: 13px 16px; }
.tut-head { display: flex; align-items: center; gap: 9px; flex-wrap: wrap; }
.tut-cmd { font-family: var(--mono); font-size: 13px; color: var(--ink); background: var(--bg-3); border: 1px solid var(--line-2); border-radius: 6px; padding: 2px 9px; white-space: nowrap; }
.tut-who { font-size: 10.5px; font-weight: 600; padding: 1px 7px; border-radius: 999px; }
.tut-body h4 { margin: 9px 0 4px; color: var(--ink); }
.tut-body p { font-size: 13px; color: var(--ink-3); margin: 0; line-height: 1.5; }
.tutorial-tip { margin: 18px 0 0; padding: 14px 16px; background: var(--bg-1); border: 1px dashed var(--line-2); border-radius: var(--radius); font-size: 13px; color: var(--ink-2); line-height: 1.55; }

/* ---------- command groups ---------- */
.cmd-group { margin-top: 26px; }
.cmd-group:first-child { margin-top: 8px; }
.cmd-group-title { font-family: var(--mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-4); margin: 0 0 12px; display: flex; align-items: center; gap: 10px; }
.cmd-group-title::after { content: ""; flex: 1; height: 1px; background: var(--line); }

.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(330px, 1fr)); gap: 12px; }

.cmd-card {
  background: var(--bg-1); border: 1px solid var(--line); border-left: 3px solid var(--accent, var(--util));
  border-radius: var(--radius); padding: 16px 17px; transition: border-color 0.15s, transform 0.12s, box-shadow 0.15s;
}
.cmd-card:hover { transform: translateY(-2px); border-color: var(--line-2); border-left-color: var(--accent, var(--util)); box-shadow: var(--shadow); }
.cmd-top { display: flex; align-items: center; gap: 9px; flex-wrap: wrap; }
.cmd-name { font-family: var(--mono); font-weight: 700; font-size: 15px; color: var(--ink); letter-spacing: -0.01em; }
.cmd-stage { font-size: 10.5px; font-family: var(--mono); text-transform: uppercase; letter-spacing: 0.05em; padding: 2px 7px; border-radius: 5px; background: var(--bg-3); color: var(--ink-3); }
.cmd-cap { margin-left: auto; font-family: var(--mono); font-size: 11px; color: var(--ink-3); border: 1px solid var(--line-2); border-radius: 999px; padding: 1px 8px; }
.cmd-cap b { color: var(--teal); }
.cmd-arg { font-family: var(--mono); font-size: 12px; color: var(--ink-4); margin: 8px 0 0; overflow-x: auto; white-space: nowrap; }
.cmd-arg::before { content: "▸ "; color: var(--teal-dim); }
.cmd-purpose { font-size: 13.5px; color: var(--ink-2); margin: 10px 0 12px; }
.cmd-meta { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { font-family: var(--mono); font-size: 11px; padding: 2px 8px; border-radius: 6px; border: 1px solid var(--line-2); color: var(--ink-3); background: var(--bg-2); white-space: nowrap; }
.chip.art { color: var(--teal); border-color: var(--teal-dim); }
.chip.label { color: var(--amber); border-color: #5a4d2a; }
.chip.codex-high { color: var(--violet); border-color: #4a3f7a; }
.chip.codex-xhigh { color: var(--pink); border-color: #6a3a4f; }
.chip.codex-sync { box-shadow: 0 0 0 1px rgba(157, 140, 255, 0.25) inset; }
.cmd-gate { font-size: 12px; color: var(--ink-4); margin: 11px 0 0; padding-top: 11px; border-top: 1px solid var(--line); line-height: 1.45; }
.cmd-gate b { color: var(--ink-3); font-weight: 600; font-family: var(--mono); font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.05em; }

.cmd-card.dim { opacity: 0.12; pointer-events: none; }

/* legend */
.legend { display: flex; gap: 14px; }
.legend-item { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--ink-3); }
.dot { width: 9px; height: 9px; border-radius: 999px; }
.dot-po { background: var(--po); }
.dot-eng { background: var(--eng); }
.dot-util { background: var(--util); }
.badge-mini { font-family: var(--mono); font-size: 11px; background: var(--bg-2); border: 1px solid var(--line-2); border-radius: 5px; padding: 0 6px; color: var(--ink-2); }

/* tags inline */
.tag { font-size: 11px; font-weight: 600; padding: 1px 7px; border-radius: 999px; }
.tag-po { background: rgba(108, 182, 255, 0.16); color: var(--po); }
.tag-eng { background: rgba(95, 224, 138, 0.16); color: var(--eng); }

/* ---------- skills ---------- */
.skill-group { margin-top: 22px; }
.skill-group-title { font-family: var(--mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-4); margin: 0 0 12px; }
.skill-card { background: var(--bg-1); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 13px 15px; transition: border-color 0.15s; }
.skill-card:hover { border-color: var(--line-2); }
.skill-name { font-family: var(--mono); font-size: 13.5px; color: var(--teal); font-weight: 500; }
.skill-purpose { font-size: 12.5px; color: var(--ink-3); margin: 5px 0 0; }
.skill-card.dim, .agent-card.dim, .fowork-card.dim { display: none; }

/* ---------- agents ---------- */
.agent-card { background: var(--bg-1); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 13px 15px; }
.agent-card:hover { border-color: var(--line-2); }
.agent-top { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; }
.agent-name { font-family: var(--mono); font-size: 13.5px; color: var(--ink); font-weight: 500; }
.agent-phase { font-family: var(--mono); font-size: 11px; color: var(--teal-dim); }
.agent-purpose { font-size: 12.5px; color: var(--ink-3); margin: 6px 0 0; }

/* ---------- fowork ---------- */
.fowork-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 12px; }
.fowork-card { background: linear-gradient(180deg, var(--bg-2), var(--bg-1)); border: 1px solid var(--line); border-radius: var(--radius); padding: 17px 18px; }
.fowork-card h4 { color: var(--ink); }
.fowork-card p { font-size: 13px; color: var(--ink-3); margin: 8px 0 0; }
.fowork-card .fw-num { font-family: var(--mono); font-size: 11px; color: var(--teal); }

/* ---------- footer ---------- */
.footer { margin-top: 56px; padding-top: 24px; border-top: 1px solid var(--line); color: var(--ink-3); }
.footer p { margin: 0; font-size: 13px; }
.footer strong { color: var(--ink-2); }
.footer-sub { margin-top: 6px !important; font-size: 12px; color: var(--ink-4); }
.footer code, .block-sub code, .loop-note code, .cmd-gate code { background: var(--bg-2); border: 1px solid var(--line); border-radius: 4px; padding: 0 5px; font-size: 0.9em; color: var(--ink-2); }

.empty-msg { color: var(--ink-4); font-family: var(--mono); font-size: 13px; padding: 20px 0; }

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .shell { grid-template-columns: 1fr; gap: 0; }
  .sidebar {
    position: fixed; top: 61px; left: 0; right: 0; bottom: auto; height: auto; z-index: 35;
    background: var(--bg-1); border-bottom: 1px solid var(--line); padding: 14px 20px;
    transform: translateY(-130%); transition: transform 0.2s ease; box-shadow: var(--shadow);
  }
  .sidebar.open { transform: translateY(0); }
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .ghlink { display: none; }
  .stage-rail, .loop-grid { grid-template-columns: 1fr 1fr; }
  .stage-chip .st-arrow { display: none; }
  .search input { width: 160px; }
}
@media (max-width: 520px) {
  .stage-rail, .loop-grid { grid-template-columns: 1fr; }
  .card-grid, .fowork-grid { grid-template-columns: 1fr; }
  .hero-cta { flex-direction: column; }
  .install { border-right: 1px solid var(--line-2); border-radius: var(--radius-sm) var(--radius-sm) 0 0; }
  .copy-btn { border-radius: 0 0 var(--radius-sm) var(--radius-sm); padding: 10px; }
  .search { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; }
}