/* ============================================================================
   footprintjs.github.io — the ecosystem home.
   One static page, no build step. Brand tokens reused from agentfootprint so the
   whole family looks consistent: brand yellow, soft off-white light / deep dark,
   content "pops" by elevation (cards on --bg-elev above the calm --bg).
   ============================================================================ */

/* ── theme tokens ─────────────────────────────────────────────────────────── */
:root {
  --bg: #fbfaf8; /* soft warm off-white (not pure #fff — easier on the eyes; cards pop above it) */
  --bg-elev: #ffffff;
  --fg: #18181b;
  --fg-muted: #5f5f63;
  --fg-faint: #9a9a9a;
  --border: #e7e7e4;
  --border-strong: #d6d5d0;
  --yellow: #ffc700;
  --yellow-dark: #b88a00;
  --shadow: 0 1px 3px rgb(0 0 0 / 0.04), 0 18px 44px -22px rgb(0 0 0 / 0.16);
  --nav-h: 60px;
  --content: 1080px;
  --gutter: clamp(20px, 5vw, 48px);
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
html.dark {
  --bg: #0a0a0b; /* deep near-black — the brand's dramatic dark; cards/marks pop a notch lighter */
  --bg-elev: #141416;
  --fg: #fafafa;
  --fg-muted: #a1a1a1;
  --fg-faint: #6b6b6b;
  --border: #262628;
  --border-strong: #3a3a3d;
  --yellow-dark: #ffd84d;
  --shadow: 0 1px 3px rgb(0 0 0 / 0.4), 0 20px 48px -22px rgb(0 0 0 / 0.6);
}

/* ── base ─────────────────────────────────────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a {
  color: inherit;
}
img {
  max-width: 100%;
}

/* ── header ───────────────────────────────────────────────────────────────── */
.hd {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 8px;
  height: var(--nav-h);
  padding: 0 var(--gutter);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.hd-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.hd-mark {
  width: 30px;
  height: 30px;
  display: block;
  object-fit: contain;
}
.hd-word {
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--fg-muted);
}
.hd-word em {
  font-style: normal;
  font-weight: 700;
  color: var(--fg);
}
.hd-gap {
  flex: 1;
}
.hd-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 9px;
  border: 0;
  background: transparent;
  color: var(--fg-muted);
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s ease, color 0.15s ease;
}
.hd-icon:hover {
  background: color-mix(in oklab, var(--fg) 8%, transparent);
  color: var(--fg);
}
.ic-sun {
  display: none;
}
html.dark .ic-moon {
  display: none;
}
html.dark .ic-sun {
  display: inline;
}

/* ── layout shell ─────────────────────────────────────────────────────────── */
main {
  max-width: var(--content);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ── hero ─────────────────────────────────────────────────────────────────── */
.hero {
  text-align: center;
  padding: 84px 0 40px;
}
.hero-mascot {
  width: clamp(120px, 16vw, 168px);
  height: auto;
  margin: 0 auto 18px;
  display: block;
  animation: float 4.5s ease-in-out infinite;
}
@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}
.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 13px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-elev);
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-muted);
}
.pill-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--yellow);
}
.hero h1 {
  font-size: clamp(34px, 5.5vw, 60px);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.05;
  margin: 18px 0 16px;
}
.hero-sub {
  max-width: 60ch;
  margin: 0 auto;
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.6;
  color: var(--fg-muted);
  text-wrap: pretty;
}
.hero-sub em {
  font-style: normal;
  color: var(--fg);
  box-shadow: inset 0 -0.42em 0 color-mix(in oklab, var(--yellow) 60%, transparent);
}

/* ── the one idea (article thesis, distilled) ─────────────────────────────── */
/* Contained in its own band (like the Libraries / UIs sections) so it reads as a highlighted unit
   rather than floating cards on the page. Recessed fill so the step cards inside still pop. */
.idea {
  text-align: center;
  margin: 34px auto 6px;
  padding: 34px 26px 30px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: color-mix(in oklab, var(--fg) 3%, var(--bg));
}
.idea-eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--yellow-dark);
}
.idea-lead {
  max-width: 54ch;
  margin: 12px auto 26px;
  font-size: clamp(17px, 2.2vw, 21px);
  line-height: 1.5;
  color: var(--fg);
  text-wrap: pretty;
}
.idea-lead em {
  font-style: normal;
  box-shadow: inset 0 -0.4em 0 color-mix(in oklab, var(--yellow) 55%, transparent);
}
.idea-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px 30px;
  text-align: left;
}
/* Plain text columns, NOT cards — the steps live inside the idea container already, so boxing each
   one would be boxes-in-a-box. A hairline divider between columns organizes them without panels. */
.idea-step {
  padding: 2px 0;
}
.idea-step + .idea-step {
  border-left: 1px solid var(--border);
  padding-left: 30px;
}
.idea-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--yellow);
  color: #18181b;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 10px;
}
.idea-step b {
  display: block;
  font-size: 15px;
  margin-bottom: 5px;
}
.idea-step small {
  display: block;
  font-size: 13px;
  line-height: 1.55;
  color: var(--fg-muted);
}
.idea-quote {
  max-width: 52ch;
  margin: 28px auto 0;
  padding-left: 16px;
  border-left: 3px solid var(--yellow);
  text-align: left;
  font-size: clamp(16px, 2vw, 19px);
  font-style: italic;
  line-height: 1.5;
  color: var(--fg-muted);
}

/* ── scroll reveal (light fade-up; disabled under reduced-motion) ──────────── */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.in {
  opacity: 1;
  transform: none;
}

/* ── architecture flow ────────────────────────────────────────────────────── */
.arch {
  margin: 26px auto 8px;
}
.arch-band {
  position: relative;
  /* shrink-wrap to the nodes inside instead of spanning the full content width — otherwise the
     nodes float in the centre of a wide band with big empty sides. (The card bands stay full-width;
     they hold grids that fill the row. These diagram bands only hold a few nodes, so they hug.) */
  width: fit-content;
  max-width: 100%;
  margin: 0 auto;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--bg-elev);
  padding: 26px 32px 22px;
  box-shadow: var(--shadow);
}
.arch-engine {
  border-color: color-mix(in oklab, var(--yellow) 45%, var(--border));
}
.arch-tag {
  position: absolute;
  top: -10px;
  left: 22px;
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--bg);
  border: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-muted);
}
.arch-engine .arch-tag {
  border-color: color-mix(in oklab, var(--yellow) 50%, var(--border));
  color: var(--yellow-dark);
}
.arch-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 14px 18px;
}
.arch-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  min-width: 150px;
  padding: 12px 18px;
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  background: var(--bg);
}
.arch-node b {
  font-size: 15px;
  font-weight: 700;
}
.arch-node small {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-faint);
}
.arch-node.core {
  border-color: var(--yellow);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--yellow) 18%, transparent);
}
.arch-edge {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-muted);
  white-space: nowrap;
}
.arch-dot {
  color: var(--fg-faint);
}
.arch-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 4px 0;
}
.arch-link::before {
  content: '';
  width: 1px;
  height: 14px;
  background: var(--border-strong);
}
.arch-link span {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--fg-faint);
  padding: 3px 0;
}
.arch-link::after {
  content: '↓';
  font-size: 12px;
  color: var(--fg-faint);
  line-height: 1;
}

/* ── groups + cards ───────────────────────────────────────────────────────── */
/* Each category is a bounded BAND (Gestalt common region) — the strongest "these belong together /
   those are separate" signal, far beyond color. Reuses the architecture diagram's corner-tag
   language so the page reads as one system: the diagram's bands and these card bands match. The
   band is faintly recessed below the page so the white cards inside read as elevated. */
.group {
  position: relative;
  margin: 34px 0 0;
  padding: 30px 20px 22px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: color-mix(in oklab, var(--fg) 3%, var(--bg));
}
.group-head {
  position: absolute;
  top: -10px;
  left: 22px;
  margin: 0;
  padding: 3px 12px;
  border-radius: 999px;
  background: var(--bg);
  border: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-muted);
}
.group-sub {
  margin: 0 0 16px;
  color: var(--fg-muted);
  font-size: 14px;
}
/* functional role icon (NOT a logo) — a glyph for what each tool DOES, in the card's accent.
   Pre-attentive + accessible: tells the products apart without relying on color. */
.card-ic {
  width: 22px;
  height: 22px;
  flex: none;
  color: var(--accent, var(--fg-muted));
}
.cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}
.cards-3 {
  grid-template-columns: repeat(3, 1fr);
}
.card {
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  padding: 20px 20px 16px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--bg-elev);
  box-shadow: var(--shadow);
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}
/* (top accent stripe removed per request — colour identity now lives in the role icon + tag) */
.card:hover {
  transform: translateY(-3px);
  border-color: var(--border-strong);
  box-shadow: 0 1px 3px rgb(0 0 0 / 0.05), 0 22px 50px -22px color-mix(in oklab, var(--accent, #000) 40%, transparent);
}
.card-hd {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}
.card-mark {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  flex: none;
}
.card-hd h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.card-tag {
  margin-left: auto;
  padding: 3px 9px;
  border-radius: 999px;
  /* tinted with the card's accent (adapts to light/dark by mixing with bg / fg) */
  background: color-mix(in oklab, var(--accent, var(--yellow)) 15%, var(--bg-elev));
  color: color-mix(in oklab, var(--accent, var(--yellow)) 60%, var(--fg));
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.03em;
  white-space: nowrap;
}
.card-desc {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--fg-muted);
  flex: 1;
}
.card-links {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.card-links a {
  padding: 6px 13px;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  color: var(--fg);
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}
.card-links a:first-child {
  background: var(--yellow);
  border-color: var(--yellow);
  color: #18181b;
}
.card-links a:hover {
  border-color: var(--yellow-dark);
  color: var(--yellow-dark);
}
.card-links a:first-child:hover {
  color: #18181b;
  filter: brightness(1.04);
}
.card-soon {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-faint);
}
/* live npm version suffix inside the npm link (filled in by JS) */
.lk-ver {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  opacity: 0.75;
}

/* ── the footprint graph (cards as nodes + labeled edges) ─────────────────── */
.graph {
  position: relative;
  margin: 40px 0 0;
}
.graph-tag {
  display: block;
  text-align: center;
  margin: 0 0 26px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--yellow-dark);
}
/* three centered tiers (footprintjs → agentfootprint → the three UIs), top-to-bottom, with vertical
   room between them for the D3-style curves to arc through. */
.gb {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 96px;
  margin: 0 auto;
}
.gb-tier {
  display: flex;
  justify-content: center;
}
.gb-t1 > .card,
.gb-t2 > .card {
  width: 100%;
  max-width: 360px;
}
.gb-t3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
  width: 100%;
  align-items: stretch;
}
/* SVG edge overlay — covers the whole graph, behind the cards, never blocks clicks. Paths + labels
   are drawn/positioned by the JS edge renderer that measures the real card positions. */
.gb-edges {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  overflow: visible;
}
.gb-edge-paths path {
  fill: none;
  stroke: var(--border-strong);
  stroke-width: 1.6;
  stroke-linejoin: round;
  stroke-linecap: round;
}
.gb-edges marker path {
  fill: var(--border-strong);
}
.gb .card {
  z-index: 1; /* cards sit above the edge overlay (curves arc through the gaps between them) */
}
.gb-elbl {
  position: absolute;
  transform: translate(-50%, -50%);
  z-index: 2;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--bg);
  border: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-muted);
  white-space: nowrap;
  pointer-events: none;
}
/* mobile: a 2-D graph can't hold — collapse to a vertical stack; relationships stay clear from each
   card's tag ("built on footprintjs", "for footprintjs", …). Hide the curves + labels. */
@media (max-width: 760px) {
  .gb {
    gap: 14px;
  }
  .gb-t3 {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .gb-edges,
  .gb-elbl {
    display: none;
  }
}

/* ── footer ───────────────────────────────────────────────────────────────── */
.ft {
  max-width: var(--content);
  margin: 64px auto 0;
  padding: 28px var(--gutter) 40px;
  border-top: 1px solid var(--border);
  text-align: center;
}
.ft-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-faint);
}
.ft-legal a {
  color: var(--fg-muted);
  text-underline-offset: 2px;
}
.ft-legal a:hover {
  color: var(--yellow-dark);
}
.ft-dot {
  opacity: 0.5;
}

/* ── responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 760px) {
  .cards,
  .cards-3,
  .idea-steps {
    grid-template-columns: 1fr;
  }
  .arch-edge {
    transform: rotate(90deg);
  }
}

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