/* ═══════════════════════════════════════════════════════════════════════════
   openrate — site stylesheet.

   Shared by index.html and docs.html so the marketing surface and the docs
   surface are the same object. Same art direction as the app itself
   ("Banknote Instrument", see web/src/styles.css): security-print engraving on
   an ink canvas, with a warm banknote-paper light theme.

   Type is Geist Sans (display + UI) and Geist Mono (every figure) — drawn for
   developer tools, with real tabular figures, rather than the editorial-serif
   register the site launched with. openrate is a rate *engine*, and the type
   should read like an instrument, not a magazine.

   Fonts are vendored in ./fonts — never fetched from Google Fonts. The site is
   served from the repo and from a static mirror, and neither should leak a
   reader's IP to a third party for the sake of a typeface.
   ═══════════════════════════════════════════════════════════════════════════ */

@font-face {
  font-family: 'Geist Sans'; font-style: normal; font-weight: 400; font-display: swap;
  src: url('./fonts/geist-sans-latin-400-normal.woff2') format('woff2');
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
@font-face {
  font-family: 'Geist Sans'; font-style: normal; font-weight: 500; font-display: swap;
  src: url('./fonts/geist-sans-latin-500-normal.woff2') format('woff2');
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
@font-face {
  font-family: 'Geist Sans'; font-style: normal; font-weight: 600; font-display: swap;
  src: url('./fonts/geist-sans-latin-600-normal.woff2') format('woff2');
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
@font-face {
  font-family: 'Geist Sans'; font-style: normal; font-weight: 700; font-display: swap;
  src: url('./fonts/geist-sans-latin-700-normal.woff2') format('woff2');
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
@font-face {
  font-family: 'Geist Mono'; font-style: normal; font-weight: 400; font-display: swap;
  src: url('./fonts/geist-mono-latin-400-normal.woff2') format('woff2');
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
@font-face {
  font-family: 'Geist Mono'; font-style: normal; font-weight: 500; font-display: swap;
  src: url('./fonts/geist-mono-latin-500-normal.woff2') format('woff2');
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
@font-face {
  font-family: 'Geist Mono'; font-style: normal; font-weight: 600; font-display: swap;
  src: url('./fonts/geist-mono-latin-600-normal.woff2') format('woff2');
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}

:root {
  --ink: #06090E; --ink-2: #0B0F16; --paper: #0E141D; --paper-2: #131A25; --paper-3: #1A2230;
  --line: #1B222D; --line-2: #252E3C; --line-3: #354152;
  --text: #ECEFF4; --text-2: #B8C1CE; --text-3: #8B96A6; --text-4: #616D7E; --text-5: #44505F;
  --blue: #4C8DFF; --teal: #2DD4BF; --amber: #E0A63C; --red: #F2665C;
  --engrave: rgba(255,255,255,.028);
  --grain-o: .035;
  --shadow-1: 0 1px 0 rgba(255,255,255,.03) inset, 0 14px 34px -20px rgba(0,0,0,.9);
  --shadow-2: 0 1px 0 rgba(255,255,255,.04) inset, 0 44px 100px -44px rgba(0,0,0,.95), 0 12px 34px -22px rgba(0,0,0,.75);
  --display: 'Geist Sans', ui-sans-serif, system-ui, -apple-system, sans-serif;
  --ui: 'Geist Sans', ui-sans-serif, system-ui, -apple-system, sans-serif;
  --mono: 'Geist Mono', ui-monospace, 'SF Mono', monospace;
  --r-xs: 4px; --r-sm: 7px; --r: 11px; --r-lg: 16px; --r-xl: 22px;
  --max: 1180px; --gut: clamp(18px, 4vw, 40px);
  --ease: cubic-bezier(.22,.72,.18,1);
  --ease-out: cubic-bezier(.16,1,.3,1);
}

[data-theme="light"] {
  --ink: #F2EFE6; --ink-2: #EAE6DA; --paper: #FBF9F4; --paper-2: #FFFFFF; --paper-3: #F1EDE2;
  --line: #E0DACB; --line-2: #D2CAB6; --line-3: #B8AF98;
  --text: #10151C; --text-2: #333B46; --text-3: #5A6472; --text-4: #7C8695; --text-5: #9AA3B0;
  --blue: #1F5FD8; --teal: #0E8E7C; --amber: #A9741A; --red: #C33A31;
  --engrave: rgba(24,32,22,.035);
  --grain-o: .05;
  --shadow-1: 0 1px 0 rgba(255,255,255,.7) inset, 0 12px 28px -20px rgba(60,50,30,.5);
  --shadow-2: 0 1px 0 rgba(255,255,255,.8) inset, 0 34px 80px -42px rgba(60,50,30,.45), 0 10px 28px -20px rgba(60,50,30,.35);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; overflow-x: clip; scroll-padding-top: 84px; -webkit-text-size-adjust: 100%; }
body {
  position: relative; min-height: 100dvh;
  background: var(--ink); color: var(--text);
  font-family: var(--ui); font-size: 16px; line-height: 1.65;
  -webkit-font-smoothing: antialiased; overflow-x: clip;
  transition: background .45s var(--ease), color .45s var(--ease);
}
body::before {
  content: ""; position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    repeating-linear-gradient(90deg, var(--engrave) 0 1px, transparent 1px 88px),
    repeating-linear-gradient(0deg, var(--engrave) 0 1px, transparent 1px 88px);
  mask-image: radial-gradient(ellipse 120% 90% at 50% 0%, #000 0%, transparent 78%);
}
body::after {
  content: ""; position: fixed; inset: 0; z-index: 1; pointer-events: none;
  opacity: var(--grain-o); mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.82' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)' opacity='.55'/%3E%3C/svg%3E");
}
a { color: inherit; text-decoration: none; }
/* height:auto is not optional next to max-width:100%. The shots carry explicit
   width/height attributes (so the layout reserves the right box before they
   load, and nothing shifts), but without this the attribute height is applied
   literally while max-width shrinks the width — every screenshot renders
   stretched vertically. */
img, svg { display: block; max-width: 100%; height: auto; }
button { font: inherit; color: inherit; }
::selection { background: color-mix(in srgb, var(--blue) 30%, transparent); }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; border-radius: var(--r-xs); }

.page { position: relative; z-index: 2; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 var(--gut); }

/* ── type ─────────────────────────────────────────────────────────────── */
.lbl {
  font-family: var(--mono); font-size: 12px; font-weight: 500;
  letter-spacing: .13em; text-transform: uppercase; color: var(--text-4); line-height: 1;
}
.eyebrow { display: inline-flex; align-items: center; gap: 10px; }
.eyebrow::before { content: ""; width: 5px; height: 5px; background: var(--teal); transform: rotate(45deg); flex: none; }
.eyebrow::after { content: ""; width: clamp(20px, 5vw, 54px); height: 1px; background: linear-gradient(90deg, var(--line-2), transparent); }

/* Geist has no italic and no width axis — Instrument Serif's elegance came
   from generous size at a light weight; Geist's comes from tight negative
   tracking at a slightly heavier one, the register a rate engine's numbers
   actually live in. */
h1, h2, h3 { font-family: var(--display); letter-spacing: -.03em; line-height: 1.02; }
h1 { font-size: clamp(2.75rem, 7.2vw, 5.1rem); line-height: .99; font-weight: 500; letter-spacing: -.042em; }
h2 { font-size: clamp(1.95rem, 4.1vw, 2.85rem); font-weight: 500; letter-spacing: -.035em; }
h3 { font-size: clamp(1.22rem, 2.1vw, 1.5rem); font-weight: 600; letter-spacing: -.015em; }
em { font-style: normal; color: var(--teal); font-weight: 500; }
p { color: var(--text-3); }
.lede { font-size: 1.09rem; line-height: 1.75; max-width: 62ch; color: var(--text-3); }
.lede b, p b { color: var(--text-2); font-weight: 600; }
.num { font-family: var(--mono); font-variant-numeric: tabular-nums; }
code { font-family: var(--mono); font-size: .88em; color: var(--teal); }

.rule { position: relative; height: 1px; background: var(--line); }
.rule::after {
  content: ""; position: absolute; left: 50%; top: 50%; width: 6px; height: 6px;
  background: var(--ink); border: 1px solid var(--line-2);
  transform: translate(-50%,-50%) rotate(45deg);
}

/* ── guilloché ────────────────────────────────────────────────────────── */
.guilloche { position: absolute; pointer-events: none; z-index: 0; color: var(--blue); }
.guilloche svg { width: 100%; height: 100%; overflow: visible; }
.guilloche .rose { animation: spin 150s linear infinite; transform-origin: 50% 50%; }
.guilloche .rose.rev { animation-duration: 210s; animation-direction: reverse; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ── header ───────────────────────────────────────────────────────────── */
.hdr {
  position: sticky; top: 0; z-index: 60; height: 66px;
  display: flex; align-items: center; gap: 14px;
  padding: 0 var(--gut);
  background: color-mix(in srgb, var(--ink) 82%, transparent);
  backdrop-filter: blur(16px) saturate(150%);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; flex: none; }
.brand svg { width: 26px; height: 26px; transition: transform .5s var(--ease); }
.brand:hover svg { transform: rotate(180deg); }
.brand .word { font-family: var(--display); font-size: 21px; font-weight: 600; letter-spacing: -.02em; line-height: 1; }
.brand .word i { font-style: normal; color: var(--teal); }
.hdr .sp { flex: 1; }
.hdr nav { display: flex; gap: 4px; }
.hdr nav a {
  padding: 9px 12px; font-size: 13.5px; font-weight: 500; color: var(--text-3);
  transition: color .2s var(--ease);
}
.hdr nav a:hover, .hdr nav a.on { color: var(--text); }
@media (max-width: 860px) { .hdr nav { display: none; } }

.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; flex: none;
  border: 1px solid var(--line-2); border-radius: 50%;
  background: transparent; color: var(--text-3); cursor: pointer;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}
.icon-btn:hover { color: var(--text); border-color: var(--line-3); background: var(--paper-3); }
.icon-btn.bare { border: none; }

.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 12px 20px; border-radius: 100px;
  font-size: 14.5px; font-weight: 600;
  border: 1px solid transparent; cursor: pointer;
  transition: transform .18s var(--ease), box-shadow .22s var(--ease), border-color .2s var(--ease), color .2s var(--ease);
}
.btn:hover { transform: translateY(-1px); }
.btn-solid { background: var(--text); color: var(--ink); box-shadow: 0 10px 26px -14px rgba(0,0,0,.85); }
.btn-solid:hover { box-shadow: 0 16px 34px -14px rgba(0,0,0,.9); }
.btn-ghost { border-color: var(--line-2); color: var(--text-2); }
.btn-ghost:hover { border-color: var(--line-3); color: var(--text); }
.btn.sm { padding: 9px 16px; font-size: 13px; }

/* ── sections ─────────────────────────────────────────────────────────── */
.sect { position: relative; padding: clamp(64px, 9vw, 128px) 0; scroll-margin-top: 70px; }
.sect.ruled { border-top: 1px solid var(--line); }
.sect.sunk { background: var(--ink-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.head { max-width: 640px; display: flex; flex-direction: column; gap: 16px; margin-bottom: clamp(32px, 4.5vw, 52px); }

/* ── hero ─────────────────────────────────────────────────────────────── */
.hero { position: relative; padding: clamp(56px, 8vw, 104px) 0 clamp(40px, 5vw, 64px); overflow: clip; }
.hero .guilloche { top: -280px; right: -220px; width: 820px; height: 820px; opacity: .34; }
[data-theme="light"] .hero .guilloche { opacity: .28; }
.hero-in { position: relative; z-index: 1; display: flex; flex-direction: column; gap: 26px; align-items: flex-start; max-width: 900px; }
.hero .lede { font-size: 1.16rem; max-width: 54ch; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 6px; }

.gauges { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); border-top: 1px solid var(--line-2); width: 100%; max-width: 680px; margin-top: 10px; }
.gauge { padding: 16px 14px 0 0; display: flex; flex-direction: column; gap: 7px; position: relative; }
.gauge + .gauge { padding-left: 18px; border-left: 1px solid var(--line); }
.gauge::before { content: ""; position: absolute; top: -1px; left: 0; width: 22px; height: 2px; background: var(--text-5); }
.gauge.live::before { background: var(--teal); }
.gauge b { font-family: var(--mono); font-size: clamp(19px, 2.2vw, 24px); font-weight: 600; letter-spacing: -.03em; color: var(--text); line-height: 1; }
.gauge.live b { color: var(--teal); }
@media (max-width: 620px) {
  .gauges { grid-template-columns: repeat(2, 1fr); }
  .gauge:nth-child(3) { padding-left: 0; border-left: none; }
  .gauge:nth-child(n+3) { border-top: 1px solid var(--line); margin-top: 14px; padding-top: 14px; }
}

/* ── shots ────────────────────────────────────────────────────────────── */
/* Every image is a real capture of the running app (web/scripts/shots.mjs),
   framed in a plate rather than a browser chrome mock — the app has its own
   chrome and faking a second one on top reads as a stock template. */
.plate {
  position: relative; border-radius: var(--r-lg); overflow: hidden;
  border: 1px solid var(--line-2); background: var(--paper);
  box-shadow: var(--shadow-2);
}
.plate::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px; z-index: 2;
  background: linear-gradient(90deg, var(--blue), var(--teal) 55%, transparent);
}
.plate img { width: 100%; }
.plate.flat { box-shadow: var(--shadow-1); }
.plate.bleed { margin-bottom: -14%; }
.shot-cap { display: flex; align-items: center; gap: 10px; margin-top: 14px; }

.hero-shot { position: relative; z-index: 1; margin-top: clamp(34px, 5vw, 56px); }

/* ── split rows ───────────────────────────────────────────────────────── */
.split { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1.12fr); gap: clamp(26px, 4.5vw, 60px); align-items: center; }
.split.one-col { grid-template-columns: minmax(0,1fr); max-width: 640px; }
.split.flip > :first-child { order: 2; }
.split + .split { margin-top: clamp(56px, 8vw, 104px); }
.split .copy { display: flex; flex-direction: column; gap: 16px; }
@media (max-width: 900px) {
  .split { grid-template-columns: 1fr; }
  .split.flip > :first-child { order: 0; }
}

.ticks { list-style: none; display: flex; flex-direction: column; gap: 12px; margin-top: 4px; }
.ticks li { position: relative; padding-left: 22px; color: var(--text-3); line-height: 1.7; font-size: 15px; }
.ticks li::before { content: ""; position: absolute; left: 2px; top: .66em; width: 5px; height: 5px; background: var(--teal); transform: rotate(45deg); }
.ticks li b { color: var(--text); font-weight: 600; }

/* ── grade seals ──────────────────────────────────────────────────────── */
.seals { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.seal-card {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 20px 18px; display: flex; flex-direction: column; gap: 12px;
  transition: border-color .2s var(--ease), transform .2s var(--ease);
}
.seal-card:hover { border-color: color-mix(in srgb, var(--sc) 45%, transparent); transform: translateY(-2px); }
.seal-card p { font-size: 13px; line-height: 1.6; color: var(--text-4); }
.seal-card .row { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.seal-card .band { font-family: var(--mono); font-size: 12px; color: var(--sc); }
.seal {
  position: relative; flex: none; display: grid; place-items: center;
  width: 52px; height: 52px; border-radius: 50%;
  font-family: var(--display); font-size: 27px; line-height: 1; color: var(--sc);
  border: 1.5px solid color-mix(in srgb, var(--sc) 55%, transparent);
  background: color-mix(in srgb, var(--sc) 11%, transparent);
}
.seal::after { content: ""; position: absolute; inset: 4px; border-radius: 50%; border: 1px solid color-mix(in srgb, var(--sc) 30%, transparent); }
.A { --sc: var(--teal); } .B { --sc: var(--blue); } .C { --sc: var(--amber); } .D { --sc: var(--red); }
@media (max-width: 860px) { .seals { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .seals { grid-template-columns: 1fr; } }

/* ── code ─────────────────────────────────────────────────────────────── */
.code { border: 1px solid var(--line-2); border-radius: var(--r); overflow: hidden; background: var(--ink-2); }
.code .bar { display: flex; align-items: center; gap: 12px; padding: 10px 14px; background: var(--paper-2); border-bottom: 1px solid var(--line); }
.code .dots { display: inline-flex; gap: 6px; }
.code .dots i { width: 9px; height: 9px; border-radius: 50%; display: block; }
.code .dots i:nth-child(1) { background: color-mix(in srgb, var(--red) 62%, transparent); }
.code .dots i:nth-child(2) { background: color-mix(in srgb, var(--amber) 62%, transparent); }
.code .dots i:nth-child(3) { background: color-mix(in srgb, var(--teal) 62%, transparent); }
.code .ttl { font-family: var(--mono); font-size: 12px; color: var(--text-4); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.code pre { margin: 0; padding: 16px 18px; overflow-x: auto; font-family: var(--mono); font-size: 12.5px; line-height: 1.8; color: var(--text-2); }
.code .c { color: var(--text-5); }
.code .p { color: var(--teal); user-select: none; }
.code .k { color: var(--blue); }
.code .s { color: var(--teal); }
.code .n { color: var(--amber); }

/* ── steps ────────────────────────────────────────────────────────────── */
.steps { list-style: none; display: flex; flex-direction: column; }
.steps li { display: grid; grid-template-columns: 42px minmax(0,1fr); gap: 16px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.steps li:last-child { border-bottom: none; }
.steps .n { font-family: var(--mono); font-size: 12px; color: var(--text-5); padding-top: 3px; }
.steps b { display: block; font-size: 15.5px; font-weight: 600; color: var(--text); margin-bottom: 5px; }
.steps span { font-size: 14px; color: var(--text-4); line-height: 1.65; }

/* ── endpoint table ───────────────────────────────────────────────────── */
.api { width: 100%; border-collapse: collapse; }
.api th, .api td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
.api th { font-family: var(--mono); font-size: 12px; font-weight: 500; letter-spacing: .1em; text-transform: uppercase; color: var(--text-4); }
.api td { font-size: 14px; color: var(--text-3); }
.api td:first-child { font-family: var(--mono); font-size: 12.5px; color: var(--teal); white-space: nowrap; }
.api tbody tr:last-child td { border-bottom: none; }
.api-scroll { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--r-lg); background: var(--paper); }

/* ── illustrations ────────────────────────────────────────────────────────
   Every diagram on this page is hand-drawn SVG/CSS, not a capture — openrate
   is a tool and a library, not a screen to photograph. The plate frame (box,
   border, gradient rule) is the same one shots used to sit in; only the
   content changed. */
.illo { padding: clamp(22px, 4vw, 44px); }
.illo-grid {
  background-image: radial-gradient(var(--line-2) 1px, transparent 1px);
  background-size: 25px 25px;
}

/* the currency graph — SVG draws the geometry (edges, nodes, the traced
   path); the labels are real HTML laid over it by percentage, not SVG
   <text>. A viewBox scales its own text down with everything else, so on a
   390px phone a 14px label was rendering at under 6px — an HTML overlay
   stays a fixed, legible size no matter how far the diagram shrinks. */
.graph-illo-wrap { position: relative; width: 100%; aspect-ratio: 760 / 500; }
.graph-illo { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; }
.graph-illo .edge { stroke: var(--line-3); stroke-width: 1.3; fill: none; }
.graph-illo .node circle { fill: var(--paper-2); stroke: var(--line-3); stroke-width: 1.5; }
.graph-illo .node.accent circle { fill: color-mix(in srgb, var(--teal) 14%, var(--paper-2)); stroke: var(--teal); stroke-width: 1.75; }
.graph-illo .trace {
  fill: none; stroke: url(#heroPathGrad); stroke-width: 3; stroke-linecap: round;
  stroke-dasharray: 1; stroke-dashoffset: 1;
  transition: stroke-dashoffset 1.4s var(--ease-out) .3s;
}
.rv.in .graph-illo .trace { stroke-dashoffset: 0; }
.node-lbl {
  position: absolute; transform: translate(-50%, -50%);
  font-family: var(--mono); font-size: 13px; font-weight: 600; color: var(--text);
  white-space: nowrap; pointer-events: none;
}
.node-lbl.accent { color: var(--text); }
.edge-lbl {
  position: absolute; transform: translate(-50%, -50%);
  font-family: var(--mono); font-size: 12px; color: var(--text-4);
  background: var(--paper); padding: 2px 8px; border-radius: 100px; line-height: 1.3;
  white-space: nowrap; pointer-events: none;
}
.edge-lbl.accent { color: var(--teal); font-weight: 600; }

/* the walk / receipt — one hop's rate is multiplied into the next */
.walk { display: flex; align-items: center; gap: 0; }
.walk-node {
  flex: none; width: 58px; height: 58px; border-radius: 50%;
  display: grid; place-items: center; background: var(--paper-2);
  border: 1.5px solid var(--teal); background: color-mix(in srgb, var(--teal) 12%, var(--paper-2));
}
.walk-node .cur { font-family: var(--mono); font-weight: 600; font-size: 13.5px; }
.walk-leg { flex: 1 1 auto; display: flex; flex-direction: column; align-items: center; gap: 9px; padding: 0 6px; min-width: 0; }
/* a plain CSS line + arrowhead, not an SVG rotated between orientations — a
   wide-short viewBox stretched into a tall-narrow box distorts under
   preserveAspectRatio, so the connector is drawn with box-model primitives
   that stay true in both directions. */
.leg-line { position: relative; width: 100%; height: 2px; background: var(--teal); flex: none; }
.leg-line::after {
  content: ""; position: absolute; right: -1px; top: 50%; transform: translateY(-50%);
  width: 0; height: 0; border: 5px solid transparent; border-right: 0; border-left: 7px solid var(--teal);
}
.leg-meta { display: flex; align-items: baseline; gap: 7px; font-size: 12px; color: var(--text-4); white-space: nowrap; }
.leg-meta .num { color: var(--text); font-size: 13.5px; }
.leg-meta .src { font-family: var(--mono); text-transform: uppercase; letter-spacing: .06em; color: var(--teal); font-weight: 600; }
@media (max-width: 560px) {
  .walk { flex-direction: column; }
  .walk-leg { flex-direction: row-reverse; padding: 14px 0; gap: 14px; }
  .leg-line { width: 2px; height: 34px; flex: none; }
  .leg-line::after {
    right: 50%; top: auto; bottom: -1px; transform: translateX(50%);
    border-right: 5px solid transparent; border-left: 5px solid transparent;
    border-bottom: 0; border-top: 7px solid var(--teal);
  }
  .leg-meta { flex-direction: column; align-items: flex-start; gap: 2px; }
}
.walk-sum {
  display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap;
  margin-top: 24px; padding-top: 18px; border-top: 1px dashed var(--line-2);
  font-family: var(--mono);
}
.walk-sum .num { font-size: 16px; color: var(--text); }
.walk-sum .op { color: var(--text-5); font-size: 14px; }
.walk-sum .result { color: var(--teal); font-weight: 600; }
.walk-sum .cap { margin-left: auto; font-family: var(--ui); }

/* the confidence equation — five factors multiplied into a grade */
.conf-eq { display: flex; align-items: center; justify-content: center; gap: 10px 6px; flex-wrap: wrap; }
.factor { display: flex; flex-direction: column; align-items: center; gap: 8px; width: 82px; }
.dial { width: 52px; height: 52px; }
.dial circle.track { fill: none; stroke: var(--line-2); stroke-width: 5; }
.dial circle.val { fill: none; stroke: var(--teal); stroke-width: 5; stroke-linecap: round; transform: rotate(-90deg); transform-origin: 50% 50%; }
.dial-wrap { position: relative; }
.factor b.num { font-size: 13px; color: var(--text); }
.factor span.lbl { text-align: center; line-height: 1.3; }
.conf-eq .op { color: var(--text-5); font-size: 19px; font-family: var(--mono); flex: none; }
.conf-eq .eq-arrow { color: var(--text-5); flex: none; width: 22px; height: 14px; }
.conf-eq .eq-arrow path { fill: none; stroke: currentColor; stroke-width: 1.6; }
.conf-result { display: flex; flex-direction: column; align-items: center; gap: 8px; }
.conf-result .num.big { font-size: 27px; color: var(--text); font-weight: 600; }
.conf-cap { text-align: center; margin-top: 26px; }

/* source dispersion — quotes on a scale zoomed to themselves */
/* geometry lives in the SVG (axis, ticks, stems, pins, bracket); all labels
   are an HTML overlay at a fixed size — see the graph illustration above. */
.disp-illo-wrap { position: relative; width: 100%; aspect-ratio: 640 / 220; }
.disp-illo { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; }
.disp-illo .axis { stroke: var(--line-3); stroke-width: 1.3; }
.disp-illo .tick { stroke: var(--line-2); stroke-width: 1; }
.disp-illo .stem { stroke: var(--line-3); stroke-width: 1.1; stroke-dasharray: 2 3; }
.disp-illo .pin circle { stroke-width: 2; fill: var(--paper); }
.disp-illo .pin.a circle { stroke: var(--teal); }
.disp-illo .pin.b circle { stroke: var(--blue); }
.disp-illo .mean-line { stroke: var(--text-4); stroke-width: 1.1; stroke-dasharray: 4 3; }
.disp-illo .bracket { stroke: var(--amber); stroke-width: 1.2; fill: none; }
.tick-lbl, .pin-lbl, .pin-src, .mean-lbl, .bracket-lbl {
  position: absolute; transform: translate(-50%, -50%);
  font-family: var(--mono); white-space: nowrap; pointer-events: none;
}
.tick-lbl { font-size: 12px; color: var(--text-5); }
.pin-lbl { font-size: 12px; font-weight: 600; color: var(--text); }
.pin-src { font-size: 12px; color: var(--text-4); text-transform: uppercase; letter-spacing: .06em; }
.mean-lbl { font-size: 12px; color: var(--text-3); }
.bracket-lbl { font-size: 12px; font-weight: 600; color: var(--amber); }

/* the board — drawn ledger, not a capture of the table UI */
.ledger { width: 100%; border-collapse: collapse; }
.ledger th, .ledger td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--line); vertical-align: middle; }
.ledger th { font-family: var(--mono); font-size: 12px; font-weight: 500; letter-spacing: .1em; text-transform: uppercase; color: var(--text-4); white-space: nowrap; }
.ledger td { font-size: 13.5px; color: var(--text-2); }
.ledger td.cur { font-family: var(--mono); font-weight: 600; color: var(--text); }
.ledger td.rate { font-family: var(--mono); color: var(--text-2); }
.ledger .hops { display: inline-flex; gap: 3px; vertical-align: middle; }
.ledger .hops i { width: 5px; height: 5px; border-radius: 50%; background: var(--line-3); display: block; }
.ledger .hops i.on { background: var(--teal); }
.ledger .seal.sm { width: 30px; height: 30px; font-size: 13px; border-width: 1.2px; }
.ledger .seal.sm::after { inset: 3px; }
.seal.md { width: 46px; height: 46px; font-size: 21px; }
.ledger tbody tr:last-child td { border-bottom: none; }
.ledger td.age { color: var(--text-4); font-family: var(--mono); font-size: 12px; }
.ledger td.note { color: var(--text-4); font-size: 12px; }
@media (max-width: 700px) { .ledger .colnote, .ledger .colage { display: none; } }

/* policy — drawn stepped sparklines, not card captures */
.policy-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(148px,1fr)); gap: 14px; }
.policy-card { background: var(--paper); border: 1px solid var(--line); border-radius: var(--r-lg); padding: 18px; display: flex; flex-direction: column; gap: 10px; }
.policy-card .top { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.policy-card .area { font-family: var(--mono); font-size: 12px; color: var(--text-4); text-transform: uppercase; letter-spacing: .08em; }
.policy-card .rate { font-family: var(--mono); font-size: 21px; color: var(--text); }
.policy-card svg { width: 100%; height: 32px; color: var(--teal); overflow: visible; }
.policy-card svg path { fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linejoin: round; }
.policy-card .bottom { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.policy-card .date { font-size: 12px; color: var(--text-5); font-family: var(--mono); }

/* ── footer ───────────────────────────────────────────────────────────── */
.ftr { border-top: 1px solid var(--line); background: var(--ink-2); position: relative; overflow: clip; }
.ftr .guilloche { bottom: -320px; left: -180px; width: 620px; height: 620px; opacity: .2; }
.ftr-in { position: relative; z-index: 1; max-width: var(--max); margin: 0 auto; padding: clamp(48px,6vw,76px) var(--gut) 28px; }
.ftr-grid { display: grid; grid-template-columns: 2.2fr 1fr 1fr 1fr; gap: clamp(24px,4vw,52px); padding-bottom: clamp(32px,4vw,52px); border-bottom: 1px solid var(--line); }
.ftr-grid p { font-size: 13.5px; line-height: 1.7; max-width: 40ch; margin: 14px 0 18px; color: var(--text-4); }
.ftr-col ul { list-style: none; display: flex; flex-direction: column; gap: 10px; margin-top: 15px; }
.ftr-col a { font-size: 13px; color: var(--text-4); transition: color .15s var(--ease); }
.ftr-col a:hover { color: var(--teal); }
.tag {
  display: inline-flex; align-items: center; gap: 8px;
  border: 1px solid var(--line-2); border-radius: 100px; padding: 7px 14px;
  font-size: 12.5px; color: var(--text-3);
  transition: border-color .18s var(--ease), color .18s var(--ease);
}
.tag:hover { border-color: var(--line-3); color: var(--text); }
.tag b { color: var(--text); font-weight: 600; }
.tag img { width: 16px; height: 16px; border-radius: 4px; }
.ftr-btm { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 14px; padding-top: 26px; }
.ftr-btm span { font-family: var(--mono); font-size: 12px; color: var(--text-5); }
.ftr-btm a { color: var(--text-4); text-decoration: underline; text-underline-offset: 3px; }
@media (max-width: 760px) { .ftr-grid { grid-template-columns: 1fr 1fr; } .ftr-brand { grid-column: 1 / -1; } }
@media (max-width: 480px) { .ftr-grid { grid-template-columns: 1fr; } }

/* ═══ docs ═════════════════════════════════════════════════════════════ */
.docs { display: grid; grid-template-columns: 256px minmax(0, 1fr); align-items: start; }
.docs-side {
  position: sticky; top: 66px; align-self: start;
  max-height: calc(100dvh - 66px); overflow-y: auto;
  padding: 30px 20px 40px var(--gut);
  border-right: 1px solid var(--line);
  display: flex; flex-direction: column; gap: 6px;
}
.docs-side::-webkit-scrollbar { width: 7px; }
.docs-side::-webkit-scrollbar-thumb { background: var(--line-2); border-radius: 7px; }
.docs-side > .lbl { margin-bottom: 6px; }
.docs-side a {
  display: block; padding: 7px 12px; font-size: 13.5px; color: var(--text-3);
  border-left: 2px solid transparent; border-radius: 0 var(--r-xs) var(--r-xs) 0;
  transition: color .15s var(--ease), border-color .15s var(--ease), background .15s var(--ease);
}
.docs-side a:hover { color: var(--text); background: var(--paper-3); }
.docs-side a.active { color: var(--teal); border-left-color: var(--teal); }

.docs-search {
  width: 100%; margin-bottom: 12px;
  background: var(--ink-2); border: 1px solid var(--line); border-radius: 100px;
  padding: 8px 14px; color: var(--text); font-family: var(--mono); font-size: 12.5px;
}
.docs-search::placeholder { color: var(--text-5); }
.docs-search:focus { outline: none; border-color: color-mix(in srgb, var(--blue) 50%, transparent); }
.hits { display: flex; flex-direction: column; gap: 2px; margin-bottom: 10px; }
.hit { display: block; padding: 8px 12px; border-radius: var(--r-sm); background: var(--paper-3); }
.hit b { display: block; font-size: 12.5px; color: var(--text); font-weight: 600; }
.hit span { display: block; font-size: 12px; color: var(--text-4); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.hits-none { padding: 10px 12px; font-size: 12.5px; color: var(--text-5); }

.docs-main { max-width: 880px; padding: clamp(30px,4vw,48px) var(--gut) clamp(56px,8vw,96px); }
.crumb { margin-bottom: 18px; }

/* rendered markdown */
.md { font-size: 15.5px; }
.md > *:first-child { margin-top: 0; }
.md h1 { font-size: clamp(2rem,4.2vw,2.9rem); margin: 0 0 18px; }
.md h2 {
  font-size: clamp(1.5rem,2.8vw,2rem); margin: 46px 0 14px;
  padding-top: 22px; border-top: 1px solid var(--line);
}
.md h3 { font-size: 1.16rem; margin: 30px 0 10px; }
/* Several docs title a section with an endpoint — "## `GET /api/v1/rates`".
   Inline code inherits the heading's size via the .86em rule, which turns a
   section title into a 2rem code block; pin it to something readable and let
   it sit on the baseline of the heading instead. */
.md h1 code, .md h2 code, .md h3 code {
  font-size: .82em; padding: 2px 8px; vertical-align: baseline;
  background: var(--ink-2); border-color: var(--line-2);
}
.md h2 code { font-size: .72em; }
/* Many canonical docs put a --- before every section heading; without this the
   hr and the heading's own top rule stack into a double line with dead space. */
.md hr + h2 { border-top: none; padding-top: 0; margin-top: 26px; }
.md h2:first-child { border-top: none; padding-top: 0; margin-top: 0; }
.md h4 { font-family: var(--ui); font-size: .96rem; font-weight: 650; color: var(--text); margin: 22px 0 8px; }
.md p { margin: 13px 0; line-height: 1.75; max-width: 72ch; }
.md a { color: var(--blue); text-decoration: underline; text-underline-offset: 3px; text-decoration-color: color-mix(in srgb, var(--blue) 35%, transparent); }
.md a:hover { text-decoration-color: currentColor; }
.md b, .md strong { color: var(--text); font-weight: 650; }
.md ul, .md ol { margin: 14px 0; padding-left: 4px; list-style: none; }
.md ol { counter-reset: md; }
.md li { position: relative; padding-left: 24px; margin: 9px 0; color: var(--text-3); line-height: 1.72; max-width: 72ch; }
.md ul > li::before { content: ""; position: absolute; left: 4px; top: .66em; width: 5px; height: 5px; background: var(--teal); transform: rotate(45deg); }
.md ol > li { counter-increment: md; }
.md ol > li::before { content: counter(md) "."; position: absolute; left: 0; top: 0; font-family: var(--mono); font-size: 12px; color: var(--text-5); }
.md li > ul, .md li > ol { margin: 8px 0; }
.md code {
  font-family: var(--mono); font-size: .86em; color: var(--teal);
  background: var(--ink-2); border: 1px solid var(--line); border-radius: var(--r-xs); padding: 1px 6px;
  /* .86em of an already-reduced parent (a <sub>, a caption) lands at 11.1px,
     under the 12px floor the rest of the page keeps. Relative sizing is right —
     inline code should track the text it sits in — so keep it and add a floor
     rather than pinning an absolute size. */
  font-size: max(12px, .86em);
}
.md pre {
  position: relative; margin: 18px 0; padding: 16px 18px; overflow-x: auto;
  background: var(--ink-2); border: 1px solid var(--line-2); border-radius: var(--r);
  font-family: var(--mono); font-size: 12.5px; line-height: 1.75; color: var(--text-2);
}
.md pre code { background: none; border: none; padding: 0; color: inherit; font-size: inherit; }
.md blockquote {
  margin: 18px 0; padding: 2px 0 2px 18px;
  border-left: 2px solid color-mix(in srgb, var(--teal) 45%, transparent);
  color: var(--text-4);
}
.md table { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 14px; display: block; overflow-x: auto; }
.md th, .md td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
.md th {
  font-family: var(--mono); font-size: 12px; font-weight: 500;
  letter-spacing: .1em; text-transform: uppercase; color: var(--text-4); white-space: nowrap;
}
.md td { color: var(--text-3); }
.md tbody tr:last-child td { border-bottom: none; }
.md hr { border: none; height: 1px; background: var(--line); margin: 40px 0; }
.md img { display: inline-block; margin: 4px 0; }
.md p[align="center"], .md div[align="center"] { text-align: center; }

.copy-btn {
  position: absolute; top: 8px; right: 8px;
  background: var(--paper-2); border: 1px solid var(--line-2); border-radius: var(--r-xs);
  color: var(--text-4); font-family: var(--mono); font-size: 12px; padding: 4px 9px;
  cursor: pointer; opacity: 0;
  transition: opacity .16s var(--ease), color .16s var(--ease), border-color .16s var(--ease);
}
.md pre:hover .copy-btn, .copy-btn:focus-visible { opacity: 1; }
.copy-btn:hover { color: var(--teal); border-color: color-mix(in srgb, var(--teal) 45%, transparent); }

.docs-err {
  border: 1px solid color-mix(in srgb, var(--red) 32%, transparent);
  background: color-mix(in srgb, var(--red) 10%, transparent);
  color: var(--red); padding: 14px 16px; border-radius: var(--r); font-size: 14px;
}

@media (max-width: 980px) {
  .docs { grid-template-columns: 1fr; }
  .docs-side {
    position: static; max-height: none; overflow-y: visible; overflow-x: auto;
    flex-direction: row; align-items: center; gap: 4px;
    padding: 12px var(--gut); border-right: none; border-bottom: 1px solid var(--line);
  }
  .docs-side > .lbl, .docs-side .docs-search, .docs-side .hits, .docs-side .hits-none { display: none; }
  .docs-side a { border-left: none; padding: 7px 10px; white-space: nowrap; }
  .docs-side a.active { border-left: none; border-bottom: 2px solid var(--teal); border-radius: 0; }
  .docs-main { max-width: none; }
}

/* ── reveal ───────────────────────────────────────────────────────────── */
.rv { opacity: 0; transform: translateY(16px); transition: opacity .7s var(--ease-out), transform .7s var(--ease-out); }
.rv.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .rv { opacity: 1; transform: none; transition: none; }
  .guilloche .rose { animation: none; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}