:root {
  --orange: #FF4500;
  --border: #E5E5E5;
  --ink: #111;
  --mono: 'JetBrains Mono', monospace;
  --sans: 'Space Grotesk', 'Noto Sans SC', system-ui, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: #fff;
  line-height: 1.6;
}

a { color: inherit; }

/* ——— nav ——— */
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 16px 28px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(255,255,255,.94);
  backdrop-filter: blur(6px);
  z-index: 10;
  flex-wrap: wrap;
}

.brand { font-family: var(--mono); font-weight: 700; font-size: .9rem; letter-spacing: .5px; }
.diamond { color: var(--orange); }

.nav-links { display: inline-flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.nav-links a { font-family: var(--mono); font-size: .76rem; text-decoration: none; color: #444; }
.nav-links a:hover { color: var(--orange); }

.gh-btn {
  border: 1px solid var(--border);
  padding: 7px 14px;
  font-weight: 700;
  color: #000 !important;
  transition: border-color .18s ease, transform .18s ease;
}
.gh-btn:hover { border-color: var(--orange); transform: translateY(-1px); }

/* ——— hero ——— */
.hero { max-width: 980px; margin: 0 auto; padding: 72px 28px 48px; }

.tag-row { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; flex-wrap: wrap; }
.orange-tag {
  background: var(--orange); color: #fff;
  font-family: var(--mono); font-size: .68rem; font-weight: 700;
  letter-spacing: 1px; text-transform: uppercase; padding: 4px 10px;
}
.version-text { font-family: var(--mono); font-size: .72rem; color: #999; }

.hero h1 { font-size: clamp(1.9rem, 4.6vw, 3.1rem); line-height: 1.15; margin: 0 0 20px; letter-spacing: -.5px; }
.gradient-text {
  background: linear-gradient(90deg, var(--orange), #FF8A00);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

.lead { max-width: 760px; color: #333; font-size: 1.02rem; }

.hero-actions { display: flex; gap: 12px; margin-top: 28px; flex-wrap: wrap; }
.primary-btn {
  background: #000; color: #fff; text-decoration: none;
  font-family: var(--mono); font-size: .8rem; font-weight: 700;
  padding: 13px 22px; transition: background .18s ease, transform .18s ease;
}
.primary-btn:hover { background: var(--orange); transform: translateY(-1px); }
.ghost-btn {
  border: 1px solid var(--border); color: #000; text-decoration: none;
  font-family: var(--mono); font-size: .8rem; font-weight: 600;
  padding: 13px 22px; transition: border-color .18s ease, transform .18s ease;
}
.ghost-btn:hover { border-color: var(--orange); transform: translateY(-1px); }

/* ——— sections ——— */
.section { max-width: 980px; margin: 0 auto; padding: 44px 28px; border-top: 1px solid var(--border); }
.section h2 { font-size: 1.4rem; margin: 0 0 8px; letter-spacing: -.3px; }
.section-sub { color: #555; max-width: 760px; margin-top: 0; }

/* ——— demo run cards ——— */
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); gap: 16px; margin-top: 26px; }

.run-card {
  display: flex; flex-direction: column; gap: 8px;
  border: 1px solid var(--border); padding: 20px;
  text-decoration: none;
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}
.run-card:hover { transform: translateY(-3px); border-color: var(--orange); box-shadow: 0 10px 28px rgba(0,0,0,.07); }

.run-top { display: flex; justify-content: space-between; gap: 10px; }
.run-status { font-family: var(--mono); font-size: .64rem; font-weight: 700; text-transform: uppercase; color: #16a34a; letter-spacing: .5px; }
.run-lang { font-family: var(--mono); font-size: .64rem; color: #999; }

.run-card h3 { margin: 2px 0 0; font-size: 1.05rem; line-height: 1.35; }
.run-prompt { margin: 0; font-size: .8rem; color: #666; display: -webkit-box; -webkit-line-clamp: 2; line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.run-meta { margin: 0; font-family: var(--mono); font-size: .68rem; color: #999; }
.run-cta { margin-top: auto; padding-top: 8px; font-family: var(--mono); font-size: .74rem; font-weight: 700; color: var(--orange); }

/* ——— video & screenshots ——— */
.demo-video { width: 100%; border: 1px solid var(--border); margin-top: 18px; background: #000; }

.shot-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; margin-top: 26px; }
.shot-grid figure { margin: 0; }
.shot-grid img { width: 100%; border: 1px solid var(--border); display: block; }
.shot-grid figcaption { font-family: var(--mono); font-size: .68rem; color: #777; padding-top: 7px; }

/* ——— stages & quickstart ——— */
.stage-list { max-width: 760px; padding-left: 22px; color: #333; }
.stage-list li { margin-bottom: 8px; }
.stage-list strong { font-family: var(--mono); color: var(--orange); font-size: .85em; text-transform: uppercase; letter-spacing: .5px; }

.quickstart {
  background: #0B0B0B; color: #E8E8E8; padding: 18px 20px;
  font-family: var(--mono); font-size: .78rem; line-height: 1.7;
  overflow-x: auto; margin-top: 26px;
}
.quickstart code { font-family: inherit; }

/* ——— footer ——— */
.footer { border-top: 1px solid var(--border); padding: 26px 28px 44px; text-align: center; }
.footer p { font-family: var(--mono); font-size: .7rem; color: #888; }
.footer a { color: #555; }
.footer a:hover { color: var(--orange); }

/* ——— demo viewer page ——— */
.viewer { max-width: 880px; margin: 0 auto; padding: 36px 28px 80px; }
.viewer-head { margin-bottom: 10px; }
.viewer-head .back { font-family: var(--mono); font-size: .74rem; text-decoration: none; color: #777; }
.viewer-head .back:hover { color: var(--orange); }
.viewer-prompt {
  border: 1px solid var(--border); border-left: 3px solid var(--orange);
  padding: 14px 18px; margin: 18px 0 8px;
  font-size: .92rem; color: #333; background: #FAFAFA;
}
.viewer-prompt .plabel { font-family: var(--mono); font-size: .64rem; font-weight: 700; text-transform: uppercase; color: var(--orange); display: block; margin-bottom: 4px; letter-spacing: 1px; }

.viewer-tabs { display: flex; gap: 0; margin: 22px 0 0; border: 1px solid var(--border); width: fit-content; }
.viewer-tabs button {
  background: #fff; border: none; border-right: 1px solid var(--border);
  font-family: var(--mono); font-size: .74rem; font-weight: 600;
  padding: 10px 18px; cursor: pointer; color: #555;
}
.viewer-tabs button:last-child { border-right: none; }
.viewer-tabs button.active { background: #000; color: #fff; }

.md-body { padding-top: 8px; }
.md-body h1 { font-size: 1.7rem; line-height: 1.3; letter-spacing: -.4px; }
.md-body h2 { font-size: 1.25rem; margin-top: 2.2em; padding-top: 1em; border-top: 1px solid var(--border); }
.md-body h3 { font-size: 1.05rem; }
.md-body blockquote { border-left: 3px solid var(--orange); margin: 1em 0; padding: 2px 18px; color: #555; background: #FAFAFA; }
.md-body table { border-collapse: collapse; width: 100%; font-size: .85rem; display: block; overflow-x: auto; }
.md-body th, .md-body td { border: 1px solid var(--border); padding: 7px 10px; text-align: left; }
.md-body th { background: #FAFAFA; font-family: var(--mono); font-size: .72rem; }
.md-body code { font-family: var(--mono); font-size: .85em; background: #F4F4F4; padding: 1px 5px; }
.md-body pre code { display: block; padding: 14px 16px; overflow-x: auto; }
.md-body img { max-width: 100%; }
.md-loading { font-family: var(--mono); font-size: .8rem; color: #999; padding: 40px 0; }

/* ——— language toggle ——— */
.lang-toggle {
  background: #fff; border: 1px solid var(--border); cursor: pointer;
  font-family: var(--mono); font-size: .72rem; font-weight: 700;
  padding: 6px 12px; color: #444;
  transition: border-color .18s ease, color .18s ease;
}
.lang-toggle:hover { border-color: var(--orange); color: var(--orange); }

/* ——— stage tabs (6 tabs, wrap on mobile) ——— */
.stage-tabs { flex-wrap: wrap; width: 100%; }
.stage-tabs button { flex: 1 1 auto; white-space: nowrap; border-bottom: 1px solid var(--border); }
.stage-intro { font-size: .86rem; color: #666; margin: 16px 0 4px; max-width: 760px; }
.stage-body { padding-top: 8px; }

/* ——— stage ①: research console log ——— */
.console-log {
  background: #0B0B0B; color: #C9EFC9; padding: 18px 20px;
  font-family: var(--mono); font-size: .7rem; line-height: 1.65;
  overflow-x: auto; white-space: pre-wrap; word-break: break-word;
  max-height: 70vh; overflow-y: auto;
}

/* ——— stage ②: actors + sources ——— */
.block-h { font-size: 1.2rem; margin: 2em 0 .4em; letter-spacing: -.3px; }
.block-h:first-child { margin-top: .6em; }
.block-sub { font-size: .82rem; color: #777; margin: 0 0 14px; }

.actor-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 12px; margin-bottom: 10px; }
.actor-card { border: 1px solid var(--border); padding: 14px 16px; font-size: .8rem; }
.actor-top { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; margin-bottom: 6px; }
.actor-type { font-family: var(--mono); font-size: .62rem; color: #999; text-transform: uppercase; }
.actor-card p { margin: 4px 0; color: #444; line-height: 1.5; }
.alabel { font-family: var(--mono); font-size: .62rem; font-weight: 700; color: var(--orange); text-transform: uppercase; margin-right: 4px; }
.actor-infl { display: inline-block; margin-top: 6px; font-family: var(--mono); font-size: .62rem; font-weight: 700; padding: 2px 8px; border: 1px solid var(--border); text-transform: uppercase; }
.infl-high { color: #b91c1c; border-color: #FCA5A5; }
.infl-medium { color: #ca8a04; border-color: #FDE68A; }
.infl-low { color: #16a34a; border-color: #B7E4C7; }

.source-list { font-size: .82rem; line-height: 1.9; padding-left: 22px; word-break: break-word; }
.source-list a { color: #2563eb; text-decoration: none; }
.source-list a:hover { text-decoration: underline; }

/* ——— stage ③: ontology cards ——— */
.onto-summary { border-left: 3px solid var(--orange); margin: 0 0 1em; padding: 10px 18px; color: #555; background: #FAFAFA; font-size: .88rem; }
.count-pill { font-family: var(--mono); font-size: .66rem; font-weight: 700; color: #fff; background: var(--orange); padding: 1px 8px; border-radius: 999px; vertical-align: middle; }
.onto-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(270px, 1fr)); gap: 12px; }
.onto-card { border: 1px solid var(--border); padding: 14px 16px; font-size: .8rem; }
.onto-card p { margin: 6px 0; color: #555; line-height: 1.5; }
.onto-name { font-family: var(--mono); font-size: .8rem; font-weight: 700; color: var(--orange); }
.onto-attrs { font-size: .7rem; color: #888; line-height: 1.9; }
.onto-attrs code { font-family: var(--mono); font-size: .66rem; background: #F4F4F4; padding: 1px 6px; }

/* ——— stage ④: knowledge graph ——— */
.graph-stats { font-family: var(--mono); font-size: .74rem; color: #555; padding: 6px 0 10px; }
.graph-note { color: #999; }
.graph-canvas { border: 1px solid var(--border); min-height: 480px; }
.g-tip { max-width: 340px; font-family: 'Space Grotesk','Noto Sans SC',sans-serif; font-size: .74rem; line-height: 1.5; }
.g-tip em { color: #FF8A60; font-style: normal; font-family: var(--mono); font-size: .64rem; }

/* ——— stage ⑤: simulated forum ——— */
.forum-bar { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; padding: 4px 0 14px; }
.forum-switch { display: inline-flex; border: 1px solid var(--border); }
.forum-switch button {
  background: #fff; border: none; border-right: 1px solid var(--border);
  font-family: var(--mono); font-size: .72rem; font-weight: 600;
  padding: 8px 16px; cursor: pointer; color: #555;
}
.forum-switch button:last-child { border-right: none; }
.forum-switch button.active { background: #000; color: #fff; }
.forum-stats { font-family: var(--mono); font-size: .7rem; color: #888; }

.feed { display: flex; flex-direction: column; gap: 10px; }
.feed-item { border: 1px solid var(--border); padding: 14px 16px; }
.feed-comment { margin-left: 34px; background: #FAFAFA; }
.feed-head { display: flex; align-items: center; gap: 8px; margin-bottom: 7px; font-size: .8rem; }
.feed-avatar {
  width: 24px; height: 24px; border-radius: 50%; color: #fff; flex: 0 0 auto;
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--mono); font-size: .7rem; font-weight: 700;
}
.feed-kind { font-family: var(--mono); font-size: .64rem; color: #999; }
.feed-round { margin-left: auto; font-family: var(--mono); font-size: .64rem; color: #aaa; white-space: nowrap; }
.feed-content { margin: 0; font-size: .84rem; line-height: 1.6; color: #222; word-break: break-word; }