:root {
  color-scheme: light;
  --bg: #f5f1ea;
  --ink: #2b2a26;
  --body: #3d3a34;
  --sub: #4f4b44;
  --muted: #6f6a60;
  --faint: #7a746a;
  --card: rgba(255, 252, 246, .92);
  --card2: #fbf9f4;
  --line: rgba(43, 42, 38, .14);
  --sage: #8fa874; --sage-ink: #5f7a48;
  --teal: #6f9aa3; --teal-ink: #4f7a83;
  --lav: #8a90b8;  --lav-ink: #5d6290;
  --clay: #c48c7d; --clay-ink: #a5654f;
  --gold: #c9a961; --gold-ink: #8a6d2f;
  --serif: 'Cormorant Garamond', Georgia, serif;
  --sans: 'Manrope', system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
  --gutter: clamp(16px, 4vw, 56px);
  --pad: clamp(24px, 3vw, 40px);
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--sans); -webkit-font-smoothing: antialiased; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body { overflow-x: hidden; }
a { color: var(--ink); text-decoration: none; }
a:hover { color: #7a6a55; }
p { margin: 0; font-size: 17px; line-height: 1.6; color: var(--body); text-wrap: pretty; }
h1, h2, h3 { margin: 0; }
button { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--teal-ink); outline-offset: 3px; border-radius: 6px; }

.mono { font-family: var(--mono); font-size: 12px; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.serif { font-family: var(--serif); font-weight: 500; }
.small { font-size: 14px; line-height: 1.55; }
.muted { color: var(--muted); }
.dot { flex: none; display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--c, var(--ink)); }
.dot.glow { box-shadow: 0 0 12px var(--c); }

.skip { position: fixed; left: 12px; top: -60px; z-index: 100; padding: 10px 14px; background: var(--card2); border: 1px solid var(--line); border-radius: 8px; }
.skip:focus { top: 12px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 18px; border-radius: 999px; border: 1px solid rgba(43, 42, 38, .35);
  font-size: 14px; font-weight: 600; white-space: nowrap; background: transparent;
  transition: background .25s, color .25s, border-color .25s;
}
.btn:hover { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.btn-solid { background: var(--ink); color: var(--bg); border-color: var(--ink); padding: 13px 22px; font-size: 15px; }
.btn-solid:hover { background: #4a463f; color: var(--bg); }
.link { cursor: pointer; background: none; border: 0; padding: 0; font-size: 14px; font-weight: 600; text-align: left; align-self: flex-start; }
.link:hover { color: #7a6a55; }

/* ---------- backdrop */
#gl { position: fixed; inset: 0; z-index: 0; background: var(--bg); }
#gl canvas { display: block; }
.grain {
  position: fixed; inset: 0; z-index: 1; pointer-events: none; opacity: .5; mix-blend-mode: multiply;
  background: radial-gradient(120% 90% at 50% 45%, rgba(255, 250, 240, .6), rgba(0, 0, 0, 0) 65%),
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='220' height='220'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 .55  0 0 0 0 .5  0 0 0 0 .45  0 0 0 .08 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
}

/* ---------- header */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 30;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  padding: 20px var(--gutter);
}
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--serif); font-weight: 600; font-size: 24px; line-height: 1; }
.mark { width: 30px; height: 30px; fill: none; stroke: var(--ink); stroke-width: 1.6; stroke-linecap: round; }
.site-header nav { display: flex; align-items: center; gap: clamp(12px, 2.2vw, 28px); font-size: 14px; font-weight: 500; margin-left: auto; }
.site-header nav a { display: flex; align-items: center; gap: 8px; opacity: .8; }
.site-header nav a:hover { opacity: 1; color: var(--ink); }
.site-header nav .dot { width: 6px; height: 6px; }
@media (max-width: 900px) { .site-header nav { display: none; } }

/* ---------- hero */
.hero {
  position: fixed; left: var(--gutter); right: var(--gutter); bottom: clamp(40px, 8vh, 88px); z-index: 10;
  display: flex; justify-content: space-between; align-items: flex-end; gap: 32px; pointer-events: none;
}
.hero-copy { display: flex; flex-direction: column; align-items: flex-start; gap: 18px; max-width: 980px; }
.hero h1 { font-family: var(--serif); font-weight: 500; font-size: clamp(72px, 10vw, 152px); line-height: .9; letter-spacing: -.02em; }
.hero p { font-size: clamp(17px, 1.4vw, 20px); line-height: 1.55; color: var(--sub); max-width: 480px; }
.hero .btn { pointer-events: auto; margin-top: 6px; }
.hero.gone .btn { pointer-events: none; }
.scroll-cue { font-size: 11px; letter-spacing: .12em; display: flex; flex-direction: column; align-items: center; gap: 10px; }
.cue-line { width: 1px; height: 48px; background: linear-gradient(var(--muted), rgba(111, 106, 96, 0)); }
@media (max-width: 640px) { .scroll-cue { display: none; } }

/* ---------- ride panels */
.ride { position: relative; height: 800vh; }
.stop {
  position: fixed; inset: 0; z-index: 12; display: flex; align-items: center;
  padding: 0 clamp(16px, 6vw, 96px); pointer-events: none;
}
.stop[data-side="right"] { justify-content: flex-end; }
.panel {
  position: relative; opacity: 0; width: var(--w); pointer-events: none;
  display: flex; flex-direction: column; gap: 18px; padding: var(--pad);
  border-radius: 14px; background: var(--card); border: 1px solid var(--line);
  will-change: transform, opacity;
}
@media (max-width: 639px) { .panel { overflow-y: auto; } }
.panel h2 { font-weight: 600; font-size: clamp(28px, 3vw, 40px); line-height: 1.05; letter-spacing: -.03em; text-wrap: balance; }
.panel-num { display: flex; align-items: center; gap: 10px; }
.stack { display: flex; flex-direction: column; gap: 10px; }

/* 01 · paths */
.paths-viz { position: relative; height: 130px; }
.paths-viz > svg { display: block; overflow: visible; }
.paths-viz path { fill: none; stroke-linecap: round; vector-effect: non-scaling-stroke; transition: all .35s; }
#pathA, #pathB { stroke-width: 8; opacity: .55; }
.origin-dot { position: absolute; left: 27px; top: 56px; width: 10px; height: 10px; border-radius: 50%; background: var(--ink); }
.origin-label { position: absolute; left: 0; top: 88px; font-size: 11px; letter-spacing: .08em; }
.branch { position: absolute; left: 100%; top: 0; width: calc(var(--pad) + 48px); height: 130px; overflow: visible; pointer-events: none; }
#branch { stroke: var(--pc, var(--sage)); stroke-width: 3; stroke-dasharray: 100; stroke-dashoffset: 100; transition: stroke-dashoffset .5s ease-out; }
.hint { font-size: 11px; letter-spacing: .08em; margin-bottom: -8px; }
.path-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.path-card {
  cursor: pointer; text-align: left; padding: 14px 16px; border-radius: 12px;
  border: 1.5px solid rgba(43, 42, 38, .12); background: rgba(251, 249, 244, .8);
  display: flex; flex-direction: column; gap: 4px; transition: border-color .3s;
}
.path-card[data-path="A"].on { border-color: var(--sage); }
.path-card[data-path="B"].on { border-color: var(--teal); }
.path-name { display: flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 600; }
.path-sub { font-size: 13px; line-height: 1.4; color: var(--muted); }
@media (max-width: 480px) { .path-cards { grid-template-columns: 1fr; } }

.pop {
  --pc: var(--sage); --pi: var(--sage-ink);
  position: absolute; left: calc(100% + 48px); top: 0; height: 100%; width: min(500px, 40vw);
  overflow-y: auto; z-index: 3; background: var(--card2); border-radius: 14px; border: 1px solid var(--line);
  padding: clamp(22px, 2.4vw, 30px); display: flex; flex-direction: column; gap: 14px;
  opacity: 0; pointer-events: none; transform: translateX(-60px) scale(.85); transform-origin: 0% 30%;
  transition: opacity .35s, transform .45s cubic-bezier(.2, .9, .25, 1.15);
}
.pop.open { opacity: 1; pointer-events: auto; transform: none; }
.pop.narrow { left: 0; width: 100%; }
.pop.is-b { --pc: var(--teal); --pi: var(--teal-ink); }
.pop-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.pop-label { display: flex; align-items: center; gap: 8px; font-size: 11px; letter-spacing: .08em; }
.pop-label .dot { background: var(--pc); }
.close { flex: none; cursor: pointer; width: 34px; height: 34px; border-radius: 50%; border: 1px solid rgba(43, 42, 38, .2); background: transparent; font-size: 18px; line-height: 1; }
.pop h3 { font-family: var(--serif); font-weight: 500; font-size: 28px; line-height: 1.05; text-wrap: pretty; }
.pop-sec { display: flex; flex-direction: column; gap: 6px; }
.pop-k { font-size: 11px; letter-spacing: .08em; color: var(--pi); }
.results-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.results-list li { display: flex; gap: 10px; align-items: baseline; font-size: 14px; line-height: 1.45; }
.results-list li::before { content: ""; flex: none; width: 6px; height: 6px; border-radius: 50%; background: var(--pc); transform: translateY(-2px); }
.pop-note { padding-top: 12px; border-top: 1px solid rgba(43, 42, 38, .12); font-size: 13px; line-height: 1.5; color: var(--sub); }
.pop-note strong { font-weight: 600; color: var(--ink); }

.viz-a, .viz-b { border-radius: 12px; background: var(--bg); border: 1px solid rgba(43, 42, 38, .08); }
.pop.is-b .viz-a, .pop:not(.is-b) .viz-b { display: none; }
.viz-a { overflow: hidden; }
.viz-bar { display: flex; align-items: center; gap: 6px; padding: 8px 12px; border-bottom: 1px solid rgba(43, 42, 38, .08); }
.viz-bar i { width: 7px; height: 7px; border-radius: 50%; background: rgba(43, 42, 38, .18); }
.viz-bar .mono { margin-left: 8px; font-size: 10px; letter-spacing: .08em; }
.viz-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; padding: 12px; }
.viz-grid > div { display: flex; flex-direction: column; gap: 6px; }
.viz-grid .mono { font-size: 10px; letter-spacing: .08em; color: var(--sage-ink); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.viz-grid b { position: relative; height: 22px; border-radius: 5px; background: var(--card2); border: 1px solid rgba(143, 168, 116, .45); }
.viz-grid b.on { border-color: var(--sage); }
.viz-grid b::before { content: ""; position: absolute; left: 6px; top: 8px; width: 5px; height: 5px; border-radius: 50%; background: var(--sage); opacity: .45; }
.viz-grid b.on::before { opacity: 1; }
.viz-grid b::after { content: ""; position: absolute; left: 17px; right: 6px; top: 9px; height: 4px; border-radius: 2px; background: rgba(43, 42, 38, .15); }
.viz-b { padding: 14px; display: grid; grid-template-columns: minmax(0, 1fr) 44px minmax(0, 1.2fr); align-items: center; gap: 6px; }
.viz-in { display: flex; flex-direction: column; gap: 6px; }
.viz-in span { display: flex; align-items: center; gap: 8px; padding: 6px 8px; border-radius: 6px; background: var(--card2); border: 1px solid rgba(43, 42, 38, .1); font-size: 10px; letter-spacing: .08em; color: var(--sub); }
.viz-in i { width: 14px; height: 10px; border-radius: 2px; border: 1.5px solid var(--teal); }
.viz-b svg { display: block; overflow: visible; }
.viz-b svg path { fill: none; stroke: var(--teal); stroke-width: 1.5; stroke-dasharray: 3 3; }
.viz-b svg circle { fill: var(--teal); }
.viz-out { display: flex; flex-direction: column; gap: 5px; padding: 8px; border-radius: 8px; background: var(--card2); border: 1px solid rgba(111, 154, 163, .4); }
.viz-out .mono { font-size: 10px; letter-spacing: .08em; color: var(--teal-ink); }
.viz-out div { display: grid; grid-template-columns: 10px 1fr .5fr; gap: 6px; align-items: center; }
.viz-out i { width: 9px; height: 9px; border-radius: 2px; background: var(--teal); }
.viz-out b { height: 4px; border-radius: 2px; background: rgba(43, 42, 38, .2); }
.viz-out s { height: 4px; border-radius: 2px; background: rgba(111, 154, 163, .45); }

/* 02 · tree */
.tree-layout { display: flex; gap: 32px; align-items: center; }
.tree-intro { flex: 0 0 27%; min-width: 0; display: flex; flex-direction: column; gap: 14px; }
.tree-wrap { position: relative; flex: 1; min-width: 0; aspect-ratio: 1200 / 580; }
.tree-inner { position: absolute; left: 0; top: 0; width: 1200px; height: 580px; transform-origin: 0 0; }
.tree-svg { position: absolute; inset: 0; overflow: visible; }
.tree-svg .edge { transition: opacity .3s; }
.tree-svg .edge path { transition: all .3s; }
.tree-counters { position: absolute; left: 400px; top: 4px; width: 400px; display: flex; justify-content: center; gap: 56px; }
.counter { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.counter b { font-family: var(--serif); font-size: 52px; font-weight: 500; line-height: 1; font-variant-numeric: lining-nums tabular-nums; }
.counter .mono { font-size: 10px; letter-spacing: .12em; }
.counter-sep { width: 1px; align-self: stretch; background: var(--line); }
.tree-hint { position: absolute; left: 400px; top: 102px; width: 400px; text-align: center; font-size: 10px; color: #8a847a; }
.tree-hub { position: absolute; left: 440px; top: 150px; width: 320px; height: 216px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px; cursor: default; }
.tree-hub > div { width: 320px; height: 180px; }
.tree-hub > span { font-family: var(--serif); font-size: 24px; font-weight: 500; line-height: 1; }
.area {
  position: absolute; width: 260px; height: 88px; border-radius: 12px; background: var(--card2);
  border: 1px solid rgba(43, 42, 38, .12); padding: 14px 18px; text-align: left; cursor: pointer;
  display: flex; flex-direction: column; justify-content: center; gap: 5px; overflow: hidden;
  transition: border-color .3s, opacity .3s;
}
.area::before { content: ""; position: absolute; left: 0; right: 0; top: 0; height: 2px; background: var(--c); }
.area-row { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.area .mono { font-size: 10px; color: var(--i); }
.area-title { font-family: var(--serif); font-size: 23px; font-weight: 500; line-height: 1.05; }
.chev { flex: none; font-size: 12px; color: var(--muted); transition: transform .3s; }
.area.open .chev { transform: rotate(180deg); }
.qpill {
  flex: none; width: 66px; text-align: center; font-family: var(--mono); font-size: 8px; line-height: 1; letter-spacing: .04em;
  text-transform: uppercase; padding: 3px 0; border-radius: 999px; background: rgba(43, 42, 38, .06); color: var(--muted);
  transition: background .3s, color .3s;
}
.tree-panel {
  position: absolute; width: 300px; z-index: 5; background: var(--card2); border-radius: 14px; border: 1px solid var(--line);
  padding: 20px 22px; display: flex; flex-direction: column; gap: 14px;
  opacity: 0; pointer-events: none; transition: opacity .3s, transform .4s cubic-bezier(.2, .9, .25, 1.15);
}
.tree-panel.open { opacity: 1; pointer-events: auto; transform: none !important; }
.tp-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.tp-head .mono { display: flex; align-items: center; gap: 8px; font-size: 10px; color: var(--i); }
.tp-head .dot { width: 7px; height: 7px; background: var(--c); }
.tree-panel .close { width: 30px; height: 30px; font-size: 16px; }
.tp-title { font-family: var(--serif); font-size: 26px; font-weight: 500; line-height: 1.05; }
.tp-note { font-size: 13px; font-style: italic; color: var(--muted); margin-top: -6px; }
.tp-tasks { list-style: none; margin: 0; padding: 0; border-top: 1px solid rgba(43, 42, 38, .1); }
.tp-tasks li { display: flex; align-items: center; gap: 12px; padding: 11px 0; border-bottom: 1px solid rgba(43, 42, 38, .1); font-size: 14px; }
.task-dot { flex: none; width: 7px; height: 7px; border-radius: 50%; background: rgba(43, 42, 38, .18); }

.tree-list { display: none; flex-direction: column; gap: 8px; }
.tree-list details { border: 1px solid rgba(43, 42, 38, .12); border-top: 2px solid var(--c); border-radius: 10px; background: var(--card2); padding: 12px 14px; }
.tree-list summary { cursor: pointer; display: flex; align-items: center; justify-content: space-between; gap: 10px; font-family: var(--serif); font-size: 21px; font-weight: 500; list-style: none; }
.tree-list summary::-webkit-details-marker { display: none; }
.tree-list summary::after { content: "▾"; font-family: var(--sans); font-size: 12px; color: var(--muted); transition: transform .3s; }
.tree-list details[open] summary::after { transform: rotate(180deg); }
.tree-list ul { margin: 10px 0 2px; padding: 0 0 0 18px; font-size: 14px; line-height: 1.7; color: var(--body); }
@media (max-width: 860px) {
  .tree-layout { flex-direction: column; align-items: stretch; gap: 18px; }
  .tree-wrap { display: none; }
  .tree-list { display: flex; }
}

/* ---------- 03 & 04 · shared */
.split { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 380px), 1fr)); gap: clamp(24px, 3vw, 44px); align-items: start; }
.ev-split { grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); gap: clamp(20px, 2.6vw, 40px); }
.split-copy, .split-demo { display: flex; flex-direction: column; gap: 16px; }
.split-demo { gap: 12px; }
.stop-h3 { font-family: var(--serif); font-weight: 500; font-size: clamp(28px, 2.6vw, 36px); line-height: 1.05; text-wrap: pretty; }
.lead { font-size: 16px; }
.facts-k { font-size: 11px; letter-spacing: .08em; padding-top: 14px; border-top: 1px solid rgba(43, 42, 38, .12); }
.facts { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px 22px; }
.facts > div { display: flex; flex-direction: column; gap: 5px; }
.facts b { font-size: 14px; font-weight: 600; }
.facts span { font-size: 13px; line-height: 1.5; color: var(--sub); text-wrap: pretty; }
.pick-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(118px, 1fr)); gap: 8px; }
.pick-grid button { cursor: pointer; padding: 10px 12px; border-radius: 10px; border: 1.5px solid var(--line); background: rgba(251, 249, 244, .8); display: flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 600; text-align: left; transition: border-color .3s, background .3s; }
.pick-grid button.on { border-color: var(--c); background: var(--t); }
.pick-line { font-size: 15px; line-height: 1.55; }
.pick-line strong { font-weight: 600; color: var(--ink); }
.stop-foot { padding-top: 14px; border-top: 1px solid rgba(43, 42, 38, .12); font-size: 15px; line-height: 1.5; color: var(--ink); font-weight: 500; }
@media (max-width: 560px) { .facts { grid-template-columns: 1fr; } }

/* ---------- 03 · the build */
.panel.build { --w: min(1200px, 96vw); }
.panel.build.fb-open { --w: min(720px, calc(100vw - var(--flyw, 480px) - clamp(16px, 6vw, 96px) - 52px)); }
.panel.build.fb-open .bd-demo { display: none; }
.sandbox { --bc: var(--teal); --bt: #eef2f0; --bi: var(--teal-ink); border-radius: 12px; background: var(--bg); border: 1px solid rgba(43, 42, 38, .1); overflow: hidden; }
.sandbox .viz-bar { padding: 9px 12px; }
.sb-title { flex: 1; }
.sb-status { padding: 3px 8px; border-radius: 999px; background: var(--card2); font-size: 10px; letter-spacing: .08em; transition: all .3s; }
.sb-status.live { background: var(--bt); color: var(--bi); }
.sb-flow { display: grid; grid-template-columns: minmax(0, 1fr) 64px minmax(0, 1.2fr); align-items: stretch; gap: 6px; padding: 14px; }
.sb-col { display: flex; flex-direction: column; gap: 6px; }
.sb-col > .mono { font-size: 10px; letter-spacing: .08em; }
.sb-handled { color: var(--bi) !important; }
.sb-list { display: flex; flex-direction: column; gap: 6px; }
.sb-in, .sb-out { display: flex; align-items: center; gap: 8px; padding: 8px 9px; border-radius: 7px; background: var(--card2); border: 1px solid rgba(43, 42, 38, .1); font-size: 12px; transition: opacity .45s, transform .45s, border-color .3s; }
.sb-in span, .sb-out span { flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sb-in i { flex: none; width: 14px; height: 10px; border-radius: 2px; border: 1.5px solid var(--bc); }
.sb-in.done { opacity: .35; transform: translateX(6px); }
.sb-out { padding: 7px 9px; opacity: 0; transform: translateX(-8px); }
.sb-out.on { opacity: 1; transform: none; }
.sb-out i { flex: none; width: 12px; height: 12px; border-radius: 50%; background: var(--bc); transition: background .3s; }
.sb-out em { flex: none; font-style: normal; font-family: var(--mono); font-size: 9px; letter-spacing: .06em; text-transform: uppercase; padding: 2px 6px; border-radius: 999px; background: var(--bt); color: var(--bi); }
.sb-out.hold { border-color: rgba(196, 140, 125, .55); }
.sb-out.hold i { background: var(--clay); }
.sb-out.hold em { background: #f5eeea; color: var(--clay-ink); }
.sb-hub { position: relative; display: flex; align-items: center; justify-content: center; }
.sb-hub svg { position: absolute; left: 0; top: 18px; width: 100%; height: calc(100% - 18px); overflow: visible; }
.sb-hub path { fill: none; stroke: var(--bc); stroke-width: 1.5; stroke-dasharray: 3 3; vector-effect: non-scaling-stroke; }
.sb-ai { position: relative; margin-top: 18px; width: 38px; height: 38px; border-radius: 50%; background: var(--bc); display: flex; align-items: center; justify-content: center; font-family: var(--mono); font-size: 11px; font-weight: 600; color: var(--card2); transition: transform .35s, box-shadow .35s, background .3s; }
.sb-ai.pulse { transform: scale(1.12); box-shadow: 0 0 0 8px rgba(43, 42, 38, .06); }
.sb-steps { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; padding: 10px 14px; border-top: 1px solid rgba(43, 42, 38, .08); }
.sb-steps div { display: flex; flex-direction: column; gap: 6px; font-family: var(--mono); font-size: 9px; letter-spacing: .06em; text-transform: uppercase; color: #8a847a; transition: color .4s; }
.sb-steps div::before { content: ""; height: 3px; border-radius: 2px; background: rgba(43, 42, 38, .12); transition: background .4s; }
.sb-steps div.on { color: var(--ink); }
.sb-steps div.on::before { background: var(--bc); }
.bd-test { padding-top: 18px; border-top: 1px solid rgba(43, 42, 38, .12); }
.fb-toggle { width: 100%; cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; padding: 12px 16px; border-radius: 12px; border: 1.5px solid var(--line); background: rgba(251, 249, 244, .8); text-align: left; transition: border-color .3s; }
.fb-toggle:hover, .fb-toggle[aria-expanded="true"] { border-color: var(--lav); }
.fb-toggle .stop-h3 { font-size: clamp(24px, 2.2vw, 30px); }
.fb-toggle-r { display: flex; align-items: center; gap: 12px; }
.fb-toggle-r .mono { font-size: 11px; letter-spacing: .08em; }
.fb-arrow { flex: none; width: 32px; height: 32px; border-radius: 50%; border: 1px solid rgba(43, 42, 38, .2); display: flex; align-items: center; justify-content: center; font-size: 14px; transition: transform .35s; }
.fb-toggle[aria-expanded="true"] .fb-arrow { transform: rotate(180deg); }

/* "How we test" flyout */
.fly {
  position: fixed; top: 0; left: 0; z-index: 60; width: min(480px, 44vw);
  display: flex; flex-direction: column; gap: 8px; padding: clamp(20px, 2.2vw, 28px);
  background: var(--card2); border-radius: 14px; border: 1px solid var(--line); box-shadow: 0 30px 60px -30px rgba(43, 42, 38, .35);
  transform-origin: 0 0; opacity: 0; visibility: hidden; transition: opacity .35s, visibility 0s .35s;
}
.fly.open { opacity: 1; visibility: visible; transition: opacity .35s; }
.fly .pop-head { margin-bottom: 4px; }
@media (max-width: 860px) { .fly { width: min(480px, calc(100vw - 32px)); } }
.fb-card { display: flex; flex-direction: column; border-radius: 12px; background: var(--bg); border: 1.5px solid rgba(43, 42, 38, .12); opacity: .6; overflow: hidden; transition: border-color .4s, opacity .4s; }
.fb-card.on { border-color: var(--fc); opacity: 1; }
.fb-head { display: flex; align-items: center; gap: 8px; padding: 10px 14px; border-bottom: 1px solid rgba(43, 42, 38, .08); }
.fb-head b { flex: 1; font-size: 13px; font-weight: 600; }
.fb-head .mono { font-size: 9px; letter-spacing: .06em; }
.fb-head .fb-n { font-size: 10px; letter-spacing: 0; }
.fb-body { display: flex; flex-direction: column; gap: 6px; padding: 12px 14px; }
.fb-run, .fb-change { display: flex; align-items: center; gap: 10px; padding: 7px 9px; border-radius: 7px; background: var(--card2); border: 1px solid rgba(43, 42, 38, .08); font-size: 12px; transition: opacity .4s, transform .4s; }
.fb-run { opacity: .4; }
.fb-run.run, .fb-run.done { opacity: 1; }
.fb-run i { flex: none; width: 12px; height: 12px; border-radius: 50%; border: 1.5px solid var(--teal); transition: background .3s; }
.fb-run.done i { background: var(--teal); }
.fb-run span { flex: 1; min-width: 0; }
.fb-run em, .fb-change em { flex: none; font-style: normal; font-family: var(--mono); font-size: 9px; letter-spacing: .06em; text-transform: uppercase; color: var(--teal-ink); }
.fb-note { display: flex; gap: 10px; align-items: flex-start; opacity: 0; transform: translateY(6px); transition: opacity .4s, transform .4s; }
.fb-note.on, .fb-change.on { opacity: 1; transform: none; }
.fb-note > i { flex: none; width: 26px; height: 26px; border-radius: 50%; background: #f5eeea; border: 1px solid rgba(196, 140, 125, .5); display: flex; align-items: center; justify-content: center; font-style: normal; font-size: 10px; font-weight: 600; color: var(--clay-ink); }
.fb-note > div { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 3px; padding: 7px 10px; border-radius: 2px 10px 10px 10px; background: var(--card2); border: 1px solid rgba(43, 42, 38, .08); font-size: 12px; line-height: 1.45; }
.fb-note .mono { font-size: 9px; letter-spacing: .06em; }
.fb-change { opacity: 0; transform: translateX(-8px); }
.fb-change em { width: 64px; text-align: center; padding: 2px 0; border-radius: 999px; background: var(--b); color: var(--k); }
.fb-change span { flex: 1; min-width: 0; line-height: 1.4; }
.fb-ok { display: flex; align-items: center; gap: 8px; padding: 0 14px 12px; font-size: 12px; font-weight: 600; color: var(--sage-ink); opacity: 0; transition: opacity .4s; }
.fb-ok.on { opacity: 1; }
.fb-round { padding-top: 6px; font-size: 11px; letter-spacing: .08em; }

/* ---------- 04 · the evolution */
.ev-chart { display: flex; flex-direction: column; gap: 10px; padding: 12px 14px; border-radius: 12px; background: var(--bg); border: 1px solid rgba(43, 42, 38, .1); }
.ev-chart svg { width: 100%; height: 150px; overflow: visible; }
.ev-chart line { stroke: rgba(43, 42, 38, .15); }
.ev-biz, .ev-cam { fill: none; stroke-dasharray: 100; stroke-dashoffset: 100; transition: stroke-dashoffset 1.2s ease; }
.ev-biz { stroke: var(--sage); stroke-width: 2.5; }
.ev-cam { stroke: var(--teal); stroke-width: 2; }
.ev-pt { fill: var(--card2); stroke: var(--teal); stroke-width: 2; opacity: 0; transition: opacity .5s; }
.ev-v, .ev-launch { font-family: var(--mono); font-size: 9px; letter-spacing: .06em; }
.ev-v { text-anchor: middle; fill: var(--teal-ink); opacity: 0; transition: opacity .5s; }
.ev-launch { fill: var(--muted); }
.ev-pt.on, .ev-v.on { opacity: 1; }
.ev-legend { display: flex; gap: 18px; flex-wrap: wrap; font-size: 12px; color: var(--sub); }
.ev-legend span { display: flex; align-items: center; gap: 8px; }
.ev-legend i { width: 18px; height: 2.5px; background: var(--sage); }
.ev-legend i.cam { height: 2px; background: var(--teal); }
.ev-now { display: flex; align-items: center; gap: 10px; padding-top: 8px; border-top: 1px solid rgba(43, 42, 38, .08); font-size: 13px; min-height: 22px; }
.ev-now .mono { flex: none; font-size: 10px; letter-spacing: .06em; color: var(--teal-ink); }
.ev-cycle { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.ev-cycle > span { display: flex; align-items: center; gap: 6px; font-size: 12px; color: #8a847a; }
.ev-cycle b { padding: 5px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; border: 1px solid var(--line); color: var(--muted); transition: all .4s; }
.ev-cycle b.on { border-color: var(--teal); background: #eef2f0; color: var(--ink); }
.ev-next { grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); }
.ev-next button { --c: var(--teal); --t: #eef2f0; }
.ev-foot { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; padding-top: 14px; border-top: 1px solid rgba(43, 42, 38, .12); }
.ev-foot p { flex: 1 1 360px; font-size: 15px; line-height: 1.5; color: var(--ink); font-weight: 500; }
.ev-foot .btn { flex: none; }

/* ---------- ride map */
.map { position: fixed; right: var(--gutter); bottom: clamp(24px, 5vh, 48px); z-index: 14; opacity: 0; display: flex; flex-direction: column; align-items: flex-end; gap: 8px; }
.map svg { overflow: visible; }
#mapPath { fill: none; stroke: rgba(43, 42, 38, .3); stroke-width: .025; }
#mapStops circle { cursor: pointer; }
#mapDot { fill: var(--ink); }
.map .mono { font-size: 11px; letter-spacing: .12em; }
@media (max-width: 640px) { .map { display: none; } }

/* ---------- after the ride */
main { position: relative; z-index: 20; background: var(--bg); }
.fade-in { position: absolute; left: 0; right: 0; top: -30vh; height: 30vh; background: linear-gradient(rgba(245, 241, 234, 0), var(--bg)); pointer-events: none; }
.contact { padding: clamp(72px, 12vh, 140px) var(--gutter); display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); gap: clamp(24px, 4vw, 64px); }
.sec-num { color: var(--faint); }
.contact-body { display: flex; flex-direction: column; gap: 24px; max-width: 760px; }
.contact h2 { font-family: var(--serif); font-weight: 500; font-size: clamp(40px, 5.5vw, 76px); line-height: .98; letter-spacing: -.02em; text-wrap: balance; }
.lede { font-size: clamp(17px, 1.4vw, 20px); color: var(--sub); max-width: 600px; }
.cta-row { display: flex; align-items: center; gap: 24px; flex-wrap: wrap; }
.about { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; margin-top: 24px; padding-top: 28px; border-top: 1px solid rgba(43, 42, 38, .12); }
.about > div { display: flex; flex-direction: column; gap: 8px; }
.about .k { font-size: 11px; color: var(--faint); }
.about p { font-size: 15px; line-height: 1.6; }
@media (max-width: 760px) {
  .contact { grid-template-columns: 1fr; }
  .about { grid-template-columns: 1fr; }
}
footer { padding: 40px var(--gutter); border-top: 1px solid rgba(43, 42, 38, .1); display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 13px; color: var(--faint); }