/* ─────────────────────────────────────────────────────────────
   Grafit Pro 3.0 — site design
   One idea holds the site together: the CABLE. Every section is a
   node with an input and an output port; the signal runs through the
   whole page. Born in the RIXC 2026 talk "Data as Clay".
   No webfonts, no frameworks: system type, one accent, sharp edges.
   ───────────────────────────────────────────────────────────── */
:root {
  --bg: #0a0b0d;
  --bg-2: #111317;
  --bg-3: #171a1f;
  --ink: #ece9e1;
  --ink-2: #b9b6ae;
  --mute: #74767b;
  --line: #24272d;
  --accent: #a6e35a;            /* signal green — Grafit's float cable */
  --accent-dim: rgba(166, 227, 90, .16);
  --rec: #ff5a4e;
  --warn: #ffb547;
  --radius: 14px;
  --sans: ui-sans-serif, -apple-system, "SF Pro Display", "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, monospace;
  --gutter: clamp(16px, 5vw, 88px);
  --nav-h: 60px;
  /* Cable colours of Grafit's port types — used as node header tints */
  --t-float: #a6e35a; --t-int: #3fd5c8; --t-string: #a07cff; --t-bool: #ff5a4e;
  --t-color: #ff5ab4; --t-structure: #f5c542; --t-json: #ff9a3d; --t-image: #3fb8d5;
}
* { 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: 18px; line-height: 1.5;
  -webkit-font-smoothing: antialiased; overflow-x: hidden;
}
/* The graph editor's dot grid — the backdrop of every page */
body::before {
  content: ""; position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image: radial-gradient(circle at 1px 1px, rgba(255,255,255,.055) 1px, transparent 0);
  background-size: 28px 28px;
  mask-image: radial-gradient(ellipse at 50% 40%, #000 30%, transparent 85%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 40%, #000 30%, transparent 85%);
}
::selection { background: var(--accent); color: #000; }
a { color: var(--accent); }
img, video, canvas { max-width: 100%; }
code { font-family: var(--mono); font-size: .86em; color: var(--ink); background: rgba(255,255,255,.06); padding: .05em .38em; border-radius: 5px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

/* ── Navigation ─────────────────────────────────────────── */
.site-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 40; height: var(--nav-h);
  display: flex; align-items: center; gap: 1.5rem; padding: 0 var(--gutter);
  background: linear-gradient(180deg, rgba(10,11,13,.92), rgba(10,11,13,.55));
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(36,39,45,.6);
}
.brand { display: flex; align-items: baseline; gap: .55rem; text-decoration: none; color: var(--ink); font-weight: 720; letter-spacing: -.04em; font-size: 1.45rem; }
.brand .ver { font-family: var(--mono); font-weight: 400; font-size: .68rem; letter-spacing: .12em; color: #0a0b0d; background: var(--accent); padding: .18rem .5rem; border-radius: 999px; transform: translateY(-.2em); }
.nav-links { display: flex; gap: .2rem; margin-left: auto; align-items: center; }
.nav-links a { font-family: var(--mono); font-size: .74rem; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-2); text-decoration: none; padding: .5rem .7rem; border-radius: 999px; transition: color .2s, background .2s; }
.nav-links a:hover { color: var(--ink); background: rgba(255,255,255,.05); }
.nav-links a.on { color: var(--accent); }
.nav-links a.store { color: #0a0b0d; background: var(--accent); margin-left: .5rem; }
.nav-links a.store:hover { background: #bdf07a; }
.nav-toggle { display: none; margin-left: auto; background: none; border: 1px solid var(--line); color: var(--ink); border-radius: 999px; padding: .45rem .8rem; font-family: var(--mono); font-size: .72rem; letter-spacing: .12em; cursor: pointer; }
@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .nav-links { display: none; position: absolute; top: var(--nav-h); left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0; padding: .6rem var(--gutter) 1.2rem; background: rgba(10,11,13,.97); border-bottom: 1px solid var(--line); }
  .site-nav.open .nav-links { display: flex; }
  .nav-links a { padding: .85rem .2rem; border-radius: 0; border-bottom: 1px solid var(--line); }
  .nav-links a.store { margin: .8rem 0 0; text-align: center; border-radius: 999px; border: 0; }
}

/* ── Type & shared pieces ───────────────────────────────── */
main { position: relative; z-index: 2; }
.kicker { font-family: var(--mono); font-size: .78rem; letter-spacing: .14em; text-transform: uppercase; color: var(--accent); margin: 0 0 1.2rem; }
.kicker b { color: var(--mute); font-weight: 400; }
h1, h2, h3 { margin: 0; }
h2 { font-size: clamp(2.1rem, 4.2vw, 4.1rem); line-height: 1.02; letter-spacing: -.025em; font-weight: 680; margin: 0 0 1.4rem; }
h2 em, h1 em, .lead em { font-style: normal; color: var(--accent); }
.idea { color: var(--ink-2); font-size: clamp(1.02rem, 1.25vw, 1.22rem); margin: 0 0 1.8rem; max-width: 34em; }
.keys { list-style: none; margin: 0; padding: 0 0 0 26px; position: relative; }
.keys::before { content: ""; position: absolute; left: 5px; top: 10px; bottom: 10px; width: 2px; background: var(--line); }
.keys li { position: relative; margin: 0 0 .75rem; font-weight: 560; }
.keys li::before { content: ""; position: absolute; left: -26px; top: .42em; width: 12px; height: 12px; border-radius: 50%; border: 2px solid var(--accent); background: var(--bg); }
.btn { display: inline-flex; align-items: center; gap: .6rem; font-family: var(--mono); font-size: .8rem; letter-spacing: .1em; text-transform: uppercase; text-decoration: none; padding: .85rem 1.3rem; border-radius: 999px; border: 1.5px solid var(--accent); color: var(--accent); transition: background .2s, color .2s, transform .2s; }
.btn:hover { background: var(--accent-dim); }
.btn.solid { background: var(--accent); color: #0a0b0d; }
.btn.solid:hover { background: #bdf07a; }
.btn svg { width: 1.05em; height: 1.05em; }
.actions { display: flex; flex-wrap: wrap; gap: .8rem; align-items: center; }
.fine { font-family: var(--mono); font-size: .74rem; letter-spacing: .05em; color: var(--mute); }

/* The port: a little circle on a node's edge. Lit when the cable reaches it. */
.port { position: absolute; width: 14px; height: 14px; margin: -7px 0 0 -7px; border-radius: 50%; background: var(--bg); border: 2px solid var(--mute); z-index: 3; transition: border-color .4s, background .4s, box-shadow .4s; }
.port.lit { border-color: var(--accent); background: var(--accent); box-shadow: 0 0 0 6px var(--accent-dim), 0 0 18px var(--accent); }
.port[data-dir="top"]    { top: 0;    left: 50%; }
.port[data-dir="bottom"] { top: 100%; left: 50%; }
.port[data-dir="left"]   { top: 38%;  left: 0; }
.port[data-dir="right"]  { top: 38%;  left: 100%; }

/* A node card — header in a cable colour, rows like ports */
.node { position: relative; border-radius: var(--radius); border: 1px solid var(--line); background: linear-gradient(180deg, rgba(255,255,255,.035), rgba(255,255,255,.012)) var(--bg); overflow: visible; }
.node > header { padding: .75rem 1.1rem; font-family: var(--mono); font-size: .76rem; letter-spacing: .12em; text-transform: uppercase; background: var(--accent); color: #0a0b0d; border-radius: calc(var(--radius) - 1px) calc(var(--radius) - 1px) 0 0; }
.node .row { padding: .85rem 1.1rem; display: flex; justify-content: space-between; gap: 1rem; color: var(--ink-2); border-top: 1px solid var(--line); font-size: .95rem; }
.node .row:first-of-type { border-top: 0; }
.node .row span:last-child { font-family: var(--mono); color: var(--mute); font-size: .8rem; text-align: right; }
.node .row b { color: var(--ink); font-weight: 600; }

/* ── Reveal ─────────────────────────────────────────────── */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .9s cubic-bezier(.2,.8,.2,1), transform .9s cubic-bezier(.2,.8,.2,1); }
.in .reveal, .reveal.in { opacity: 1; transform: none; }
.in .reveal.d1 { transition-delay: .08s; } .in .reveal.d2 { transition-delay: .18s; }
.in .reveal.d3 { transition-delay: .28s; } .in .reveal.d4 { transition-delay: .38s; }

/* ── Footer ─────────────────────────────────────────────── */
.site-foot { position: relative; z-index: 2; border-top: 1px solid var(--line); padding: 3rem var(--gutter) 2.6rem; display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 2rem; color: var(--mute); font-size: .88rem; }
.site-foot .brand { font-size: 1.3rem; margin-bottom: .8rem; }
.site-foot h4 { font-family: var(--mono); font-weight: 400; font-size: .7rem; letter-spacing: .14em; text-transform: uppercase; color: var(--mute); margin: 0 0 .8rem; }
.site-foot a { color: var(--ink-2); text-decoration: none; display: block; margin: 0 0 .45rem; }
.site-foot a:hover { color: var(--accent); }
.site-foot p { margin: 0 0 .5rem; }
@media (max-width: 760px) { .site-foot { grid-template-columns: 1fr; } }

/* ── Reading pages (About, Privacy, Talks, Tutorials) ───── */
.page { padding: calc(var(--nav-h) + 9vh) var(--gutter) 10vh; max-width: 1180px; margin: 0 auto; }
.page-head { margin-bottom: 4.5rem; max-width: 46rem; position: relative; }
.page-head h1 { font-size: clamp(2.6rem, 6vw, 5.2rem); line-height: .98; letter-spacing: -.035em; font-weight: 700; margin-bottom: 1.4rem; }
.page-head p { color: var(--ink-2); font-size: 1.15rem; margin: 0; }
.prose { max-width: 46rem; }
.prose h2 { font-size: clamp(1.4rem, 2.2vw, 1.9rem); letter-spacing: -.015em; margin: 3.2rem 0 1rem; font-weight: 650; }
.prose h3 { font-size: 1.08rem; margin: 2rem 0 .6rem; font-weight: 650; }
.prose p, .prose li { color: var(--ink-2); }
.prose strong { color: var(--ink); font-weight: 600; }
.prose ul { padding-left: 1.2rem; }
.prose li { margin: 0 0 .55rem; }
.prose a { color: var(--accent); text-decoration: none; border-bottom: 1px solid var(--accent-dim); }
.prose .summary { border: 1px solid var(--line); border-left: 3px solid var(--accent); border-radius: 10px; padding: 1.1rem 1.3rem; background: var(--bg-2); color: var(--ink); }
.prose pre { background: var(--bg-2); border: 1px solid var(--line); border-radius: 10px; padding: 1rem 1.2rem; overflow-x: auto; font-family: var(--mono); font-size: .78rem; color: var(--ink-2); white-space: pre-wrap; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 22px; }
.card { position: relative; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg-2); padding: 1.5rem 1.5rem 1.4rem; text-decoration: none; color: var(--ink); display: block; transition: border-color .25s, transform .25s; }
a.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card h3 { font-size: 1.2rem; letter-spacing: -.01em; margin: 0 0 .6rem; }
.card p { color: var(--ink-2); font-size: .95rem; margin: 0 0 1rem; }
.card .go { font-family: var(--mono); font-size: .74rem; letter-spacing: .1em; text-transform: uppercase; color: var(--accent); }

/* ── Tutorials ── */
.tut-embed { position: relative; aspect-ratio: 16 / 9; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); background: #000; margin-bottom: 3.5rem; }
.tut-embed iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.tut-title { font-size: clamp(1.4rem, 2.2vw, 1.9rem); font-weight: 650; letter-spacing: -.015em; margin: 0 0 1.4rem; }
.tut-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 18px; }
.tutorials-video-card { text-align: left; background: var(--bg-2); border: 1px solid var(--line); border-radius: 12px; padding: 0; overflow: hidden; cursor: pointer; color: var(--ink); font: inherit; transition: border-color .2s, transform .2s; }
.tutorials-video-card:hover { border-color: var(--mute); transform: translateY(-2px); }
.tutorials-video-card.active { border-color: var(--accent); }
.tutorials-video-thumb { position: relative; aspect-ratio: 16 / 9; background: #000; }
.tutorials-video-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.tutorials-video-index { position: absolute; left: 8px; top: 8px; font-family: var(--mono); font-size: .7rem; background: rgba(10,11,13,.8); color: var(--ink); padding: .15rem .45rem; border-radius: 999px; }
.tutorials-video-play { position: absolute; right: 8px; bottom: 8px; width: 30px; height: 30px; border-radius: 50%; background: var(--accent); color: #0a0b0d; display: grid; place-items: center; font-size: .7rem; }
.tutorials-video-info { padding: .75rem .9rem .9rem; }
.tutorials-video-title { margin: 0; font-size: .9rem; line-height: 1.35; color: var(--ink-2); }
.tutorials-playlist-error { color: var(--ink-2); font-size: .95rem; }

/* ── Catalog / node pages: the documentation app keeps its layout,
      the site lends it its colours and its navigation ───────────── */
body.doc-app { --g-bg: var(--bg); --g-surface: var(--bg-2); --g-surface-2: var(--bg-3); --g-border: var(--line);
  --g-text: var(--ink); --g-text-muted: var(--mute); --g-accent: var(--accent); --g-accent-glow: var(--accent-dim);
  background: var(--bg); font-family: var(--sans); }
body.doc-app .docs-layout { height: 100vh; padding-top: var(--nav-h); position: relative; z-index: 2; }
@media (max-width: 768px) { body.doc-app .docs-layout { height: auto; } }
body.doc-app #node-detail { position: relative; z-index: 2; padding-top: var(--nav-h); }
body.doc-app .docs-sidebar { background: rgba(10,11,13,.92); border-right: 1px solid var(--line); }
body.doc-app .docs-content { background: transparent; }
body.doc-app .welcome-logo { display: none; }
body.doc-app .docs-welcome h2 { font-size: clamp(2.2rem, 4vw, 3.4rem); letter-spacing: -.03em; }

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