/* ============================================================
   CodeGraph · Understand-Anything · Claude Plugins
   Technical deep-dive — design system
   ============================================================ */

:root {
  /* surfaces */
  --bg:        #0a0b0e;
  --bg-grad:   #0c0e14;
  --bg-elev:   #111319;
  --bg-card:   #14161e;
  --bg-card-2: #181b24;
  --border:    rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);

  /* text */
  --text:      #e7e9f0;
  --text-dim:  #a3a9b8;
  --text-faint:#6f7585;

  /* accents */
  --gold:   #e0b07a;   /* global warm accent */
  --gold-2: #d4a574;
  --cyan:   #54d6e0;   /* codegraph */
  --amber:  #e9b873;   /* understand-anything */
  --coral:  #e08a64;   /* claude plugins (Anthropic clay) */
  --green:  #7fcf9e;

  --shadow: 0 24px 60px -24px rgba(0, 0, 0, 0.8);
  --radius: 16px;
  --maxw: 1080px;

  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --disp: "Space Grotesk", var(--sans);
  --serif:"Fraunces", Georgia, serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: 145px; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* layered background glow */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(900px 520px at 78% -8%, rgba(224, 176, 122, 0.10), transparent 60%),
    radial-gradient(720px 460px at 8% 12%, rgba(84, 214, 224, 0.07), transparent 55%),
    radial-gradient(820px 600px at 50% 108%, rgba(224, 138, 100, 0.07), transparent 60%),
    var(--bg);
}
body::after {
  content: "";
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background-image: linear-gradient(rgba(255,255,255,.018) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,.018) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(circle at 50% 30%, black, transparent 80%);
}

a { color: inherit; text-decoration: none; }
::selection { background: rgba(224,176,122,.3); color: #fff; }

/* ---------- layout ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 820px; }

section { padding: 96px 0; position: relative; }
section + section { border-top: 1px solid var(--border); }

/* ---------- scroll progress ---------- */
#progress {
  position: fixed; top: 0; left: 0; height: 3px; width: 0%;
  background: linear-gradient(90deg, var(--cyan), var(--gold), var(--coral));
  z-index: 100; transition: width .1s linear;
}

/* ---------- nav ---------- */
/* ---------- site index (top nav) ---------- */
.site-index {
  position: fixed; top: 0; left: 0; right: 0; z-index: 95;
  background: rgba(8, 9, 11, 0.96);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}
.site-index .wrap { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }
.site-index-label {
  font-size: 12px; font-family: var(--mono); letter-spacing: .1em;
  text-transform: uppercase; color: var(--text-faint); white-space: nowrap;
}
.site-index-links { display: flex; gap: 6px; flex-wrap: wrap; }
.site-index-links a {
  display: inline-block; font-size: 13px; font-weight: 600;
  color: var(--text-dim); padding: 7px 14px; border-radius: 9px;
  border: 1px solid transparent; text-decoration: none;
  transition: color .2s, background .2s, border-color .2s;
  line-height: 1.3;
}
.site-index-links a:hover {
  color: var(--text); background: rgba(255,255,255,.06); border-color: var(--border);
}
.site-index-links a span { display: block; font-size: 11px; font-weight: 400; color: var(--text-faint); margin-top: 2px; }

header.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 90;
  backdrop-filter: blur(14px);
  background: rgba(10, 11, 14, 0.72);
  border-bottom: 1px solid transparent;
  transition: border-color .3s, background .3s;
}
header.nav.scrolled { border-bottom-color: var(--border); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 11px; font-family: var(--disp); font-weight: 700; letter-spacing: -.02em; }
.brand .dot { width: 11px; height: 11px; border-radius: 50%; background: linear-gradient(135deg, var(--cyan), var(--coral)); box-shadow: 0 0 14px var(--gold); }
.brand span { font-size: 15px; }
.nav-links { display: flex; gap: 6px; align-items: center; }
.nav-links a {
  font-size: 13.5px; color: var(--text-dim); padding: 8px 13px; border-radius: 9px;
  transition: color .2s, background .2s; font-weight: 500;
}
.nav-links a:hover { color: var(--text); background: rgba(255,255,255,.05); }
.nav-toggle { display: none; background: none; border: 1px solid var(--border); color: var(--text);
  border-radius: 9px; width: 40px; height: 40px; font-size: 18px; cursor: pointer; }

/* ---------- hero ---------- */
.hero { padding: 150px 0 88px; text-align: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 9px; font-family: var(--mono);
  font-size: 12px; letter-spacing: .12em; text-transform: uppercase; color: var(--gold);
  border: 1px solid var(--border-strong); border-radius: 999px; padding: 7px 16px;
  background: rgba(224,176,122,.05); margin-bottom: 30px;
}
.pulse { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 0 rgba(127,207,158,.6); animation: pulse 2.4s infinite; }
@keyframes pulse { 0%{box-shadow:0 0 0 0 rgba(127,207,158,.5)} 70%{box-shadow:0 0 0 9px rgba(127,207,158,0)} 100%{box-shadow:0 0 0 0 rgba(127,207,158,0)} }

.hero h1 {
  font-family: var(--disp); font-weight: 700; letter-spacing: -.035em;
  font-size: clamp(2.6rem, 7vw, 5rem); line-height: 1.02; margin-bottom: 26px;
}
.hero h1 .ital { font-family: var(--serif); font-style: italic; font-weight: 400;
  background: linear-gradient(110deg, var(--cyan), var(--gold) 50%, var(--coral)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p.lead { max-width: 680px; margin: 0 auto 18px; font-size: clamp(1.05rem, 2.2vw, 1.3rem); color: var(--text-dim); }
.hero .sub { font-family: var(--mono); font-size: 13px; color: var(--text-faint); letter-spacing: .02em; }
.hero .sub b { color: var(--gold-2); font-weight: 500; }

/* ---------- project tri-cards in hero ---------- */
.tri { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 58px; }
.pcard {
  position: relative; text-align: left; background: linear-gradient(180deg, var(--bg-card), var(--bg-elev));
  border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; overflow: hidden;
  transition: transform .25s ease, border-color .25s ease;
}
.pcard:hover { transform: translateY(-4px); border-color: var(--accent, var(--gold)); }
.pcard::before { content:""; position:absolute; top:0; left:0; right:0; height:3px; background: var(--accent); opacity:.8; }
.pcard .rank { font-family: var(--mono); font-size: 11px; color: var(--text-faint); letter-spacing: .1em; }
.pcard h3 { font-family: var(--disp); font-size: 1.18rem; margin: 6px 0 4px; letter-spacing: -.02em; }
.pcard h3 a:hover { color: var(--accent); }
.pcard .tag { font-size: 12.5px; color: var(--text-dim); min-height: 38px; }
.pcard .stats { display: flex; gap: 14px; margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--border); }
.pcard .stat .n { font-family: var(--disp); font-weight: 700; font-size: 1.15rem; color: var(--accent); }
.pcard .stat .l { font-size: 10.5px; color: var(--text-faint); text-transform: uppercase; letter-spacing: .06em; }
.pcard.cg { --accent: var(--cyan); }
.pcard.ua { --accent: var(--amber); }
.pcard.cp { --accent: var(--coral); }

/* ---------- section heading ---------- */
.shead { margin-bottom: 44px; }
.shead .kicker { font-family: var(--mono); font-size: 12px; letter-spacing: .14em; text-transform: uppercase; color: var(--accent, var(--gold)); }
.shead h2 { font-family: var(--disp); font-weight: 700; letter-spacing: -.03em; font-size: clamp(1.8rem, 4.2vw, 2.8rem); margin: 12px 0 14px; line-height: 1.08; }
.shead p { color: var(--text-dim); max-width: 720px; }

/* ---------- prose ---------- */
.prose p { margin: 0 0 18px; color: var(--text-dim); }
.prose h4 { font-family: var(--disp); font-size: 1.12rem; color: var(--text); margin: 34px 0 12px; letter-spacing: -.01em; display: flex; align-items: center; gap: 10px; }
.prose h4::before { content:""; width: 16px; height: 2px; background: var(--accent, var(--gold)); border-radius: 2px; }
.prose strong { color: var(--text); font-weight: 600; }
.prose code { font-family: var(--mono); font-size: .86em; background: rgba(255,255,255,.06); padding: 2px 6px; border-radius: 5px; color: var(--gold-2); }
.prose ul { margin: 0 0 18px; padding-left: 0; list-style: none; }
.prose ul li { position: relative; padding-left: 26px; margin-bottom: 11px; color: var(--text-dim); }
.prose ul li::before { content: "▹"; position: absolute; left: 4px; color: var(--accent, var(--gold)); }
.prose ul li strong { color: var(--text); }
.prose a.inline { color: var(--accent, var(--gold)); border-bottom: 1px solid rgba(255,255,255,.18); }
.prose a.inline:hover { border-bottom-color: var(--accent, var(--gold)); }

/* ---------- project section frame ---------- */
.project { scroll-margin-top: 80px; }
.project.cg { --accent: var(--cyan); }
.project.ua { --accent: var(--amber); }
.project.cp { --accent: var(--coral); }
.project.oh { --accent: var(--green); }
/* compact stat strip for single-project page */
.statstrip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin: 38px 0; }
.statstrip .cell { background: var(--bg-card); border: 1px solid var(--border); border-radius: 14px; padding: 18px 18px; text-align: left; }
.statstrip .cell .n { font-family: var(--disp); font-weight: 700; font-size: 1.7rem; color: var(--accent, var(--gold)); line-height: 1; }
.statstrip .cell .l { font-size: 12px; color: var(--text-faint); text-transform: uppercase; letter-spacing: .06em; margin-top: 8px; }
@media (max-width: 720px){ .statstrip { grid-template-columns: 1fr 1fr; } }
/* tree-diagram primitive used by the three-trees section */
.trees3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; margin: 26px 0; }
.trees3 .t { background: linear-gradient(180deg, var(--bg-card), var(--bg-elev)); border: 1px solid var(--border); border-radius: 14px; padding: 22px; }
.trees3 .t h5 { font-family: var(--disp); font-size: 1.1rem; margin-bottom: 4px; }
.trees3 .t .badge { display: inline-block; font-family: var(--mono); font-size: 11px; padding: 3px 9px; border-radius: 999px; margin-bottom: 12px; background: rgba(127,207,158,.12); color: var(--green); border: 1px solid rgba(127,207,158,.3); }
.trees3 .t p { color: var(--text-dim); font-size: 14.5px; margin: 0 0 12px; }
.trees3 .t ul { margin: 0; padding-left: 0; list-style: none; font-size: 13.5px; }
.trees3 .t li { padding-left: 18px; position: relative; margin-bottom: 6px; color: var(--text-dim); }
.trees3 .t li::before { content: "•"; position: absolute; left: 4px; color: var(--accent, var(--green)); }
@media (max-width: 880px){ .trees3 { grid-template-columns: 1fr; } }

/* ============================================================
   Tab strip — project switcher in nav
   ============================================================ */
header.nav.has-tabs { padding-bottom: 0; }
header.nav.has-tabs .nav-inner { height: 60px; }
.tabs-wrap { border-top: 1px solid var(--border); background: rgba(10, 11, 14, 0.55); }
.tabs {
  display: flex; gap: 4px; max-width: var(--maxw); margin: 0 auto; padding: 0 24px;
  overflow-x: auto; -webkit-overflow-scrolling: touch; scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }
.tabs button {
  font-family: var(--disp); font-weight: 500; font-size: 13.5px; letter-spacing: -.005em;
  color: var(--text-dim); background: none; border: none; cursor: pointer;
  padding: 14px 18px 13px; position: relative; white-space: nowrap;
  border-bottom: 2px solid transparent; transition: color .2s, border-color .2s;
  display: flex; align-items: center; gap: 9px;
}
.tabs button .dot {
  width: 8px; height: 8px; border-radius: 50%; background: var(--tab-color, var(--text-faint));
  transition: box-shadow .2s, transform .2s;
}
.tabs button[data-tab="cg"] { --tab-color: var(--cyan); }
.tabs button[data-tab="ua"] { --tab-color: var(--amber); }
.tabs button[data-tab="cp"] { --tab-color: var(--coral); }
.tabs button[data-tab="oh"] { --tab-color: var(--green); }
.tabs button:hover { color: var(--text); }
.tabs button.active {
  color: var(--text); border-bottom-color: var(--tab-color);
}
.tabs button.active .dot { box-shadow: 0 0 12px var(--tab-color); transform: scale(1.15); }
.tabs button .pill {
  font-family: var(--mono); font-size: 10.5px; padding: 2px 7px; border-radius: 999px;
  background: rgba(255,255,255,.05); color: var(--text-faint); letter-spacing: .03em;
}

/* push body content down to clear nav + tabs */
body.tabs-active { padding-top: 0; }

/* tab panels — hide all by default; the one with .active shows */
.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeIn .35s ease; }
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) { .tab-panel.active { animation: none; } }

/* per-tab accent color for sections inside */
.tab-panel[data-tab="cg"] section { --accent: var(--cyan); }
.tab-panel[data-tab="ua"] section { --accent: var(--amber); }
.tab-panel[data-tab="cp"] section { --accent: var(--coral); }
.tab-panel[data-tab="oh"] section { --accent: var(--green); }
.tab-panel[data-tab="cg"] .shead .kicker,
.tab-panel[data-tab="cg"] .eyebrow { color: var(--cyan); border-color: rgba(84,214,224,.3); background: rgba(84,214,224,.06); }
.tab-panel[data-tab="ua"] .shead .kicker,
.tab-panel[data-tab="ua"] .eyebrow { color: var(--amber); border-color: rgba(233,184,115,.3); background: rgba(233,184,115,.06); }
.tab-panel[data-tab="cp"] .shead .kicker,
.tab-panel[data-tab="cp"] .eyebrow { color: var(--coral); border-color: rgba(224,138,100,.3); background: rgba(224,138,100,.06); }
.tab-panel[data-tab="oh"] .shead .kicker,
.tab-panel[data-tab="oh"] .eyebrow { color: var(--green); border-color: rgba(127,207,158,.3); background: rgba(127,207,158,.06); }

/* the hero's gradient italic text per tab */
.tab-panel[data-tab="cg"] .hero h1 .ital { background: linear-gradient(110deg, var(--cyan), var(--gold) 50%, var(--coral)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.tab-panel[data-tab="oh"] .hero h1 .ital { background: linear-gradient(110deg, var(--cyan), var(--green) 50%, var(--gold)); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* When nav has tabs, account for taller header in scroll-padding */
html.has-tabs { scroll-padding-top: 130px; }

/* scroll-back-to-top affordance */
.totop {
  position: fixed; right: 22px; bottom: 22px; z-index: 80;
  width: 44px; height: 44px; border-radius: 50%; display: grid; place-items: center;
  background: var(--bg-card); border: 1px solid var(--border-strong); color: var(--text-dim);
  cursor: pointer; opacity: 0; pointer-events: none; transition: opacity .25s, transform .25s, color .2s, border-color .2s;
  font-size: 18px;
}
.totop.show { opacity: 1; pointer-events: auto; }
.totop:hover { color: var(--text); border-color: var(--accent, var(--gold)); transform: translateY(-2px); }

@media (max-width: 600px) {
  .tabs button { padding: 12px 13px 11px; font-size: 12.5px; }
  .tabs button .pill { display: none; }
}
.proj-head { display: flex; align-items: flex-start; gap: 20px; margin-bottom: 12px; }
.proj-badge {
  flex: 0 0 auto; width: 56px; height: 56px; border-radius: 14px; display: grid; place-items: center;
  font-family: var(--disp); font-weight: 700; font-size: 1.4rem; color: var(--bg);
  background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent) 55%, #fff));
  box-shadow: 0 10px 30px -8px var(--accent);
}
.proj-title h2 { font-family: var(--disp); font-weight: 700; font-size: clamp(1.7rem, 4vw, 2.5rem); letter-spacing: -.03em; line-height: 1.05; }
.proj-title .repo { font-family: var(--mono); font-size: 13px; color: var(--accent); }
.proj-title .repo:hover { text-decoration: underline; }

/* stat row */
.statrow { display: flex; flex-wrap: wrap; gap: 12px; margin: 26px 0 38px; }
.statrow .chip {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px;
  padding: 12px 18px; min-width: 130px;
}
.statrow .chip .n { font-family: var(--disp); font-weight: 700; font-size: 1.5rem; color: var(--accent); line-height: 1; }
.statrow .chip .l { font-size: 11.5px; color: var(--text-faint); text-transform: uppercase; letter-spacing: .05em; margin-top: 6px; }

/* ---------- cards grid ---------- */
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card {
  background: linear-gradient(180deg, var(--bg-card), var(--bg-elev));
  border: 1px solid var(--border); border-radius: 14px; padding: 22px;
  transition: border-color .25s, transform .25s;
}
.card:hover { border-color: var(--border-strong); transform: translateY(-2px); }
.card .ico { font-size: 1.4rem; margin-bottom: 12px; display: block; }
.card h5 { font-family: var(--disp); font-size: 1.02rem; margin-bottom: 8px; letter-spacing: -.01em; }
.card p { font-size: 14.5px; color: var(--text-dim); margin: 0; }
.card .accent { color: var(--accent, var(--gold)); }

/* ---------- code block ---------- */
.code {
  position: relative; background: #0b0d12; border: 1px solid var(--border);
  border-radius: 14px; margin: 24px 0; overflow: hidden; box-shadow: var(--shadow);
}
.code .bar { display: flex; align-items: center; gap: 7px; padding: 11px 16px; border-bottom: 1px solid var(--border); background: rgba(255,255,255,.02); }
.code .bar i { width: 11px; height: 11px; border-radius: 50%; display: inline-block; }
.code .bar i:nth-child(1){ background:#ff5f56 } .code .bar i:nth-child(2){ background:#ffbd2e } .code .bar i:nth-child(3){ background:#27c93f }
.code .bar .fname { margin-left: 10px; font-family: var(--mono); font-size: 12px; color: var(--text-faint); }
.code pre { margin: 0; padding: 18px 20px; overflow-x: auto; font-family: var(--mono); font-size: 13px; line-height: 1.65; }
.code pre code { background: none; padding: 0; color: #cdd3e0; font-size: 13px; }
.tok-c { color: #6b7280; font-style: italic; }   /* comment */
.tok-k { color: #c792ea; }                         /* keyword */
.tok-s { color: #c3e88d; }                         /* string */
.tok-f { color: #82aaff; }                         /* function */
.tok-t { color: #ffcb6b; }                         /* type */
.tok-n { color: #f78c6c; }                         /* number/const */
.tok-p { color: #89ddff; }                         /* punctuation accent */

/* ---------- pipeline diagram ---------- */
.pipe { display: flex; flex-direction: column; gap: 0; margin: 26px 0; }
.pipe .stage {
  display: flex; align-items: center; gap: 16px; padding: 16px 20px;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px;
}
.pipe .arrow { align-self: center; color: var(--accent, var(--gold)); font-size: 18px; padding: 4px 0; }
.pipe .stage .sn { font-family: var(--mono); font-size: 12px; color: var(--accent); flex: 0 0 28px; }
.pipe .stage .st b { font-family: var(--disp); font-size: 1rem; }
.pipe .stage .st small { display: block; font-size: 13px; color: var(--text-faint); }

/* ---------- file tree ---------- */
.tree { font-family: var(--mono); font-size: 13px; line-height: 1.9; color: var(--text-dim);
  background: #0b0d12; border: 1px solid var(--border); border-radius: 14px; padding: 20px 22px; margin: 22px 0;
  white-space: pre; overflow-x: auto; -webkit-overflow-scrolling: touch; tab-size: 2; }
.tree .d { color: var(--accent, var(--gold)); }
.tree .c { color: var(--text-faint); }
.tree .h { color: var(--text); }

/* ---------- comparison table ---------- */
.tablewrap { overflow-x: auto; border: 1px solid var(--border); border-radius: 14px; margin: 8px 0; }
table.cmp { width: 100%; border-collapse: collapse; min-width: 640px; font-size: 14.5px; }
table.cmp th, table.cmp td { text-align: left; padding: 15px 18px; border-bottom: 1px solid var(--border); vertical-align: top; }
table.cmp thead th { font-family: var(--disp); font-size: 13px; text-transform: uppercase; letter-spacing: .05em; color: var(--text-faint); background: rgba(255,255,255,.02); }
table.cmp tbody tr:last-child td { border-bottom: none; }
table.cmp td:first-child { color: var(--text); font-weight: 500; }
table.cmp .c-cg { color: var(--cyan); } table.cmp .c-ua { color: var(--amber); } table.cmp .c-cp { color: var(--coral); }
table.cmp tbody tr:hover { background: rgba(255,255,255,.015); }

/* ---------- callout ---------- */
.callout {
  border-left: 3px solid var(--accent, var(--gold)); background: rgba(255,255,255,.03);
  border-radius: 0 12px 12px 0; padding: 18px 22px; margin: 26px 0; font-size: 15px; color: var(--text-dim);
}
.callout b { color: var(--text); }

/* ---------- benchmark bars ---------- */
.bench { display: grid; gap: 14px; margin: 24px 0; }
.bench .row { display: grid; grid-template-columns: 130px 1fr 56px; align-items: center; gap: 14px; }
.bench .row .lbl { font-size: 13.5px; color: var(--text-dim); }
.bench .row .track { height: 10px; background: rgba(255,255,255,.06); border-radius: 6px; overflow: hidden; }
.bench .row .fill { height: 100%; border-radius: 6px; background: linear-gradient(90deg, var(--cyan), var(--gold)); width: 0; transition: width 1.1s cubic-bezier(.2,.8,.2,1); }
.bench .row .val { font-family: var(--disp); font-weight: 700; font-size: 14px; color: var(--gold); text-align: right; }

/* ---------- ecosystem / synthesis ---------- */
.eco { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 0; align-items: stretch; margin: 30px 0; }
.eco .node { text-align: center; padding: 26px 18px; border: 1px solid var(--border); background: var(--bg-card); }
.eco .node:nth-child(1){ border-radius: 14px 0 0 14px; border-right: none; }
.eco .node:nth-child(3){ border-radius: 0 14px 14px 0; border-left: none; }
.eco .node h5 { font-family: var(--disp); font-size: 1.05rem; margin-bottom: 8px; }
.eco .node.cg h5 { color: var(--cyan); } .eco .node.ua h5 { color: var(--amber); } .eco .node.cp h5 { color: var(--coral); }
.eco .node p { font-size: 13px; color: var(--text-dim); }
.eco .node .layer { font-family: var(--mono); font-size: 11px; color: var(--text-faint); text-transform: uppercase; letter-spacing: .08em; margin-bottom: 12px; }

/* ---------- footer ---------- */
footer { padding: 60px 0 80px; border-top: 1px solid var(--border); text-align: center; }
footer .fbrand { font-family: var(--disp); font-weight: 700; font-size: 1.2rem; margin-bottom: 10px; }
footer p { color: var(--text-faint); font-size: 13.5px; margin: 6px auto; max-width: 560px; }
footer .links { display: flex; gap: 18px; justify-content: center; margin: 22px 0; flex-wrap: wrap; }
footer .links a { font-size: 13.5px; color: var(--text-dim); border-bottom: 1px solid transparent; }
footer .links a:hover { color: var(--gold); border-bottom-color: var(--gold); }
footer .meta { font-family: var(--mono); font-size: 11.5px; color: var(--text-faint); margin-top: 16px; }

/* ---------- reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 880px) {
  .tri { grid-template-columns: 1fr; }
  .grid2, .grid3 { grid-template-columns: 1fr; }
  .eco { grid-template-columns: 1fr; }
  .eco .node { border-radius: 0 !important; border: 1px solid var(--border) !important; border-bottom: none !important; }
  .eco .node:first-child { border-radius: 14px 14px 0 0 !important; }
  .eco .node:last-child { border-radius: 0 0 14px 14px !important; border-bottom: 1px solid var(--border) !important; }
  .nav-links { display: none; position: absolute; top: 64px; left: 0; right: 0; flex-direction: column;
    background: rgba(12,14,20,.97); backdrop-filter: blur(14px); border-bottom: 1px solid var(--border); padding: 14px 24px; gap: 2px; }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 10px; }
  .nav-toggle { display: block; }
  .bench .row { grid-template-columns: 96px 1fr 48px; }
  section { padding: 70px 0; }
}
@media (max-width: 520px) {
  body { font-size: 16px; }
  .proj-head { flex-direction: row; }
  .statrow .chip { min-width: calc(50% - 6px); flex: 1; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}

/* ============ NAV-TOC SIDEBAR (left rail TOC) ============ */
.nav-toc {
  position: fixed;
  top: 150px;
  left: max(12px, calc((100vw - var(--maxw)) / 2 - 212px));
  width: 200px;
  max-height: calc(100vh - 190px);
  overflow-y: auto;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 12px;
  z-index: 40;
  display: none;
  scrollbar-width: thin;
}
@media (min-width: 1520px) { .nav-toc { display: block; } }
.nav-toc h3 {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin: 0 0 10px;
  padding: 0 8px;
}
.nav-toc ul { list-style: none; margin: 0; padding: 0; }
.nav-toc li { margin: 1px 0; }
.nav-toc a {
  display: block;
  padding: 5px 8px;
  border-radius: 6px;
  border-left: 2px solid transparent;
  font-size: 12.5px;
  line-height: 1.35;
  color: var(--text-dim);
  text-decoration: none;
  transition: color .15s, background .15s;
}
.nav-toc a:hover { color: var(--text); background: rgba(255,255,255,.04); }
.nav-toc a.active {
  color: var(--accent, var(--gold));
  background: rgba(255,255,255,.05);
  border-left-color: var(--accent, var(--gold));
}
.nav-toc li.toc-sub a { padding-left: 18px; font-size: 12px; color: var(--text-faint); }
.nav-toc li.toc-sub a:hover, .nav-toc li.toc-sub a.active { color: var(--accent, var(--gold)); }