/* ayeo.io
   The ayeo design system: white page, zinc neutrals, navy ink, one signal green.
   The navy "instrument" panel is the one loud thing. Tokens are copied from
   the ayeo Design System (see DESIGN.md); the names here are the site's roles. */

/* IBM Plex Sans and Plex Mono, self-hosted because the Content Security
   Policy allows fonts only from this site. The Sans files are the latin
   subsets from @fontsource/ibm-plex-sans 5.2.6. */
@font-face {
  font-family: "IBM Plex Sans";
  src: url("../fonts/plex-sans-400.woff2") format("woff2");
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Sans";
  src: url("../fonts/plex-sans-500.woff2") format("woff2");
  font-weight: 500;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Sans";
  src: url("../fonts/plex-sans-600.woff2") format("woff2");
  font-weight: 600;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("../fonts/plex-mono-400.woff2") format("woff2");
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("../fonts/plex-mono-500.woff2") format("woff2");
  font-weight: 500;
  font-display: swap;
}

:root {
  /* Page: bg / bg-subtle / fg / fg-muted / border */
  --paper: #ffffff;
  --paper-2: #fafafa;
  --ink: #18181b;
  --ink-2: #52525b;
  --rule: #e4e4e7;
  /* primary / primary-hover */
  --link: #0e3a5f;
  --link-hover: #0a2c49;
  --button: #0e3a5f;
  --button-text: #ffffff;
  /* Focus rings need 3:1 against what they sit on: navy on paper, signal on navy */
  --focus: #0e3a5f;

  /* The instrument stays navy in both themes: navy-600 / 500 / 400, text navy-50 / 200 */
  --panel: #0e3a5f;
  --panel-2: #1f547f;
  --panel-rule: #3f719a;
  --panel-text: #eaf1f7;
  --panel-muted: #9bbad0;
  /* The reading: signal-500, with dark text on a signal fill */
  --needle: #10b981;
  --needle-ink: #0b0b0e;
  --panel-heading: #ffffff;
  /* Secondary strokes on navy: navy-300 */
  --sky: #6a95b6;
  /* The one warm colour, kept for human sign-off marks in the explainers only */
  --amber: #f59e0b;
  --on-amber: #0b0b0e;
  --amber-text: #b45309;

  --status-planned: #6a4fd8;
  --status-building: #1f547f;
  --status-shipped: #0b7a57;
  --status-shelved: #71717a;

  --sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --step--1: 0.875rem;
  --step-0: 1rem;
  --step-1: 1.25rem;
  --step-2: 1.625rem;
  --step-3: clamp(1.75rem, 1.3rem + 1.4vw, 2.25rem);
  --step-4: clamp(2.25rem, 1.5rem + 3vw, 3.5rem);

  --wrap: 72rem;
  --gutter: clamp(1rem, 3vw, 2rem);
  --masthead-height: 4rem;
  /* The design system's radius scale: sm 4, md 6, lg 10, tile 14 */
  --radius-sm: 4px;
  --radius: 6px;
  --radius-lg: 10px;
  --radius-mark: 8px;
  --radius-pill: 999px;
  --page-alt: var(--paper-2);

  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0b0b0e;
    --paper-2: #18181b;
    --ink: #fafafa;
    --ink-2: #a1a1aa;
    --rule: #27272a;
    --link: #6a95b6;
    --link-hover: #ffffff;
    --button: #6a95b6;
    --button-text: #0b0b0e;
    --focus: #2eb87a;
    --needle: #2eb87a;
    --amber-text: #fcd34d;
    /* navy-600 on zinc-950 still stands out; the panel does not change */
    --status-planned: #a895ff;
    --status-building: #6a95b6;
    --status-shipped: #5dcc95;
    --status-shelved: #a1a1aa;
    color-scheme: dark;
  }
}
/* The masthead theme switcher sets data-theme; the same values as the dark media block above. */
:root[data-theme="dark"] {
  --paper: #0b0b0e;
  --paper-2: #18181b;
  --ink: #fafafa;
  --ink-2: #a1a1aa;
  --rule: #27272a;
  --link: #6a95b6;
  --link-hover: #ffffff;
  --button: #6a95b6;
  --button-text: #0b0b0e;
  --focus: #2eb87a;
  --needle: #2eb87a;
  --amber-text: #fcd34d;
  --status-planned: #a895ff;
  --status-building: #6a95b6;
  --status-shipped: #5dcc95;
  --status-shelved: #a1a1aa;
  color-scheme: dark;
}
:root[data-theme="light"] { color-scheme: light; }

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-padding-top: 5rem; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: var(--step-0);
  line-height: 1.6;
  font-kerning: normal;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; height: auto; }

a { color: var(--link); text-underline-offset: 0.18em; text-decoration-thickness: 1px; }
a:hover { color: var(--link-hover); text-decoration-thickness: 2px; }

:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; border-radius: 4px; }
.instrument, .band, .tree { --focus: var(--needle); }

h1, h2, h3 { line-height: 1.15; margin: 0 0 0.6em; text-wrap: balance; }
h1 { font-size: var(--step-4); font-weight: 600; letter-spacing: -0.02em; }
h2 { font-size: var(--step-3); font-weight: 600; letter-spacing: -0.01em; }
h3 { font-size: var(--step-1); font-weight: 600; letter-spacing: -0.01em; line-height: 1.3; }
p { margin: 0 0 1em; }
code, pre { font-family: var(--mono); font-size: 0.92em; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter); }
.narrow { max-width: 38em; }
.small { font-size: var(--step--1); color: var(--ink-2); }
.lede { font-size: var(--step-1); line-height: 1.5; color: var(--ink-2); max-width: 34em; }

.skip { position: absolute; left: -999px; top: 0; background: var(--ink); color: var(--paper); padding: 0.5rem 1rem; z-index: 10; }
.skip:focus { left: 1rem; top: 1rem; }
.skip:hover { color: var(--paper); }
.visually-hidden { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

/* Masthead */
.masthead {
  position: sticky; top: 0; z-index: 5;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}
.masthead-inner { display: flex; align-items: center; justify-content: space-between; height: 4rem; }
.brand { display: inline-flex; align-items: center; gap: 0.5rem; color: var(--ink); text-decoration: none; font-weight: 600; font-size: 1.25rem; letter-spacing: -0.01em; }
.masthead nav { display: flex; gap: clamp(1rem, 3vw, 2rem); }
.masthead nav a { color: var(--ink-2); text-decoration: none; font-weight: 500; white-space: nowrap; }
@media (max-width: 30rem) {
  /* The brand already links home, so phones drop the duplicate Compass link */
  .masthead nav { gap: 1rem; font-size: var(--step--1); }
  .masthead nav a[href="/#compass"] { display: none; }
}
.masthead nav a:hover, .masthead nav a[aria-current="page"] { color: var(--ink); text-decoration: underline; text-decoration-thickness: 2px; text-underline-offset: 0.4em; }

/* Buttons */
.actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 2rem; }
.facts { margin-top: 1rem; }
.button {
  display: inline-block; padding: 0.7rem 1.1rem; border-radius: var(--radius);
  background: var(--button); color: var(--button-text); border: 1px solid var(--button);
  font-weight: 500; text-decoration: none; line-height: 1.2;
}
.button:hover { color: var(--button-text); background: color-mix(in srgb, var(--button) 94%, var(--ink)); border-color: color-mix(in srgb, var(--button) 94%, var(--ink)); text-decoration: none; }
.button.quiet { background: transparent; color: var(--ink); border-color: var(--rule); }
.button.quiet:hover { border-color: var(--ink-2); color: var(--ink); background: var(--paper-2); }

/* Hero */
.hero { padding: clamp(2.5rem, 6vw, 5rem) 0 clamp(3rem, 6vw, 5rem); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: clamp(2rem, 5vw, 4rem); align-items: start; }
@media (min-width: 62rem) { .hero-grid { grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr); } .hero-copy { padding-top: 2.5rem; } }
.product { display: inline-flex; align-items: center; gap: 0.5rem; font-weight: 600; color: var(--ink); margin-bottom: 1.5rem; }
.product .mark { color: var(--link); flex: none; width: 36px; height: 36px; }
.hero h1 { max-width: 13em; }
.for-teams { margin: 1.25rem 0 0; font-size: var(--step--1); color: var(--ink-2); }

/* The instrument */
.instrument {
  margin: 0;
  background: var(--panel);
  color: var(--panel-text);
  border-radius: var(--radius-lg);
  padding: clamp(1.1rem, 2.5vw, 1.75rem);
  border: 1px solid var(--panel-rule);
  box-shadow: 0 24px 60px -24px rgba(14, 58, 95, 0.45);
}
.instrument-q { margin: 0 0 0.85rem; color: var(--panel-muted); font-size: var(--step--1); }
.choices { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.25rem; }
/* Without JavaScript the picker cannot work, so only the stacked examples show */
.instrument-q, .choices { display: none; }
.js .instrument-q { display: block; }
.js .choices { display: flex; }
@media (max-width: 35.99rem) {
  /* One scrolling row on phones keeps the readout near the top of the screen */
  .js .choices {
    flex-wrap: nowrap; overflow-x: auto; scroll-snap-type: x proximity;
    margin-inline: calc(-1 * clamp(1.1rem, 2.5vw, 1.75rem)); padding: 0.2rem clamp(1.1rem, 2.5vw, 1.75rem) 0.4rem;
    scrollbar-width: none;
  }
  .js .choices::-webkit-scrollbar { display: none; }
  .js .choices button { flex: none; scroll-snap-align: start; white-space: nowrap; }
}
.choices button {
  font: inherit; font-size: var(--step--1); font-weight: 500;
  color: var(--panel-text); background: var(--panel-2);
  border: 1px solid var(--panel-rule); border-radius: var(--radius-pill);
  padding: 0.35rem 0.75rem; cursor: pointer; text-align: left;
}
.choices button:hover { border-color: var(--needle); }
.choices button[aria-selected="true"] { background: var(--needle); color: var(--needle-ink); border-color: var(--needle); font-weight: 600; }

.readout { border-top: 1px solid var(--panel-rule); padding-top: 1.1rem; }
.readout + .readout { margin-top: 1.5rem; }
/* All panels share one grid cell, so the instrument keeps the height of the
   tallest and the page below does not move when the selection changes */
.js .readouts { display: grid; }
.js .readout { grid-area: 1 / 1; margin-top: 0; }
.js .readout[data-hidden] { visibility: hidden; }
.prompt { font-family: var(--mono); font-size: 0.86rem; font-weight: 400; letter-spacing: 0; line-height: 1.5; text-wrap: wrap; color: var(--needle); margin: 0 0 1rem; overflow-wrap: anywhere; }
.prompt span { color: var(--panel-muted); }

.assessment { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.6rem 1.25rem; margin: 0 0 1.25rem; }
@media (min-width: 36rem) { .assessment { grid-template-columns: auto auto auto minmax(0, 1fr); } .meter dd { white-space: nowrap; } .meter.goal dd { white-space: normal; } }
.meter dt { font-family: var(--mono); font-size: 0.69rem; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase; color: var(--panel-muted); margin-bottom: 0.2rem; }
.meter dd { margin: 0; font-size: var(--step--1); font-weight: 600; display: flex; align-items: center; gap: 0.5rem; }
.ticks { display: inline-flex; gap: 3px; }
.ticks i { width: 7px; height: 14px; border-radius: 2px; background: var(--panel-rule); transition: background-color 0.18s cubic-bezier(0.2, 0, 0, 1); }
.meter[data-level="1"] .ticks i:nth-child(-n+1),
.meter[data-level="2"] .ticks i:nth-child(-n+2),
.meter[data-level="3"] .ticks i:nth-child(-n+3) { background: var(--needle); }
.meter[data-level] .ticks i:nth-child(2) { transition-delay: 0.06s; }
.meter[data-level] .ticks i:nth-child(3) { transition-delay: 0.12s; }

.approach { background: var(--panel-2); border-radius: var(--radius); padding: 0.9rem 1.1rem; margin-bottom: 1.1rem; }
.approach-name { font-size: var(--step-2); font-weight: 600; letter-spacing: -0.01em; color: var(--needle); margin: 0 0 0.15rem; line-height: 1.15; }
.approach p:last-child { margin: 0; color: var(--panel-text); }

.plan { display: grid; gap: 0.9rem 1.5rem; margin: 0; }
@media (min-width: 36rem) { .plan { grid-template-columns: repeat(2, minmax(0, 1fr)); } .plan .omitted { grid-column: 1 / -1; } }
.plan dt { font-family: var(--mono); font-size: 0.69rem; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase; color: var(--panel-muted); margin-bottom: 0.2rem; }
.plan dd { margin: 0; font-size: var(--step--1); line-height: 1.5; }
.plan ul { margin: 0; padding: 0; list-style: none; }
.plan li { padding-left: 1rem; position: relative; }
.plan li::before { content: ""; position: absolute; left: 0; top: 0.62em; width: 6px; height: 2px; background: var(--sky); }
.omitted { border-top: 1px dashed var(--panel-rule); padding-top: 0.9rem; }
.omitted dt { color: var(--needle); }
.instrument-note { margin: 1.1rem 0 0; font-size: 0.78rem; color: var(--panel-muted); }
.instrument-note a { color: var(--needle); }

/* Sections */
.section { padding: clamp(3rem, 7vw, 5.5rem) 0; }
.band { background: var(--panel); color: var(--panel-text); padding: clamp(2.5rem, 6vw, 4rem) 0; }
.band h2 { color: var(--panel-heading); }
.band p { color: var(--panel-muted); }
.band a { color: var(--needle); }
.band .button { background: var(--panel-heading); border-color: var(--panel-heading); color: var(--panel); }
.band .button:hover { background: var(--panel-text); border-color: var(--panel-text); color: var(--panel); }
.band .button.quiet { background: transparent; color: var(--panel-heading); border-color: var(--panel-rule); }
.band .button.quiet:hover { border-color: var(--panel-heading); color: var(--panel-heading); background: transparent; }
.closing-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem 2rem; }
.closing h2 { margin: 0; }
.closing .actions { margin: 0; }
.tinted { background: var(--paper-2); }
.two-col { display: grid; gap: 2rem clamp(2rem, 6vw, 5rem); align-items: start; }
@media (min-width: 56rem) { .two-col { grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr); } }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.prose-block { max-width: 38em; }

/* Install */
.code-stack { display: grid; gap: 0.6rem; }
.code {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  background: var(--panel-2); border: 1px solid var(--panel-rule); border-radius: var(--radius);
  padding: 0.7rem 0.7rem 0.7rem 1rem;
}
.code code { color: var(--panel-text); overflow-wrap: anywhere; font-size: 0.88rem; }
.copy { display: none; }
.js .copy {
  display: inline-block;
  font: inherit; font-size: 0.8rem; font-weight: 500; flex: none;
  background: transparent; color: var(--needle); border: 1px solid var(--panel-rule);
  border-radius: var(--radius-sm); padding: 0.3rem 0.65rem; cursor: pointer;
}
.copy:hover { border-color: var(--needle); }
@media (pointer: coarse) { .js .copy { min-height: 44px; min-width: 44px; } }
.code-after { margin: 0.6rem 0 0; color: var(--panel-muted); font-size: var(--step--1); }
.band .small { color: var(--panel-muted); margin-top: 0.5rem; }
/* Real CLI output: long lines wrap inside the block so no part of it is hidden. */
.output { margin: 0; background: var(--panel-2); border: 1px solid var(--panel-rule); border-radius: var(--radius); padding: 0.9rem 1rem; white-space: pre-wrap; overflow-wrap: anywhere; }
.output code { color: var(--panel-text); font-size: 0.78rem; line-height: 1.6; }

/* Pipeline: a real sequence */
.pipeline { margin: clamp(2.5rem, 5vw, 3.5rem) 0 0; }
.pipeline ol {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.5rem;
  counter-reset: stage;
}
@media (min-width: 48rem) { .pipeline ol { grid-template-columns: repeat(6, 1fr); gap: 0; } }
.pipeline li {
  font-family: var(--mono); font-weight: 500; font-size: 0.95rem;
  padding: 0.9rem 1rem; border: 1px solid var(--rule); background: var(--paper);
  position: relative;
}
@media (min-width: 48rem) {
  .pipeline li { border-right-width: 0; }
  .pipeline li:first-child { border-radius: var(--radius) 0 0 var(--radius); background: var(--link); color: #ffffff; border-color: var(--link); }
  .pipeline li:last-child { border-right-width: 1px; border-radius: 0 var(--radius) var(--radius) 0; }
}
@media (max-width: 47.99rem) { .pipeline li { border-radius: var(--radius); } .pipeline li:first-child { background: var(--link); color: #ffffff; border-color: var(--link); } }
:root[data-theme="dark"] .pipeline li:first-child { color: #0b0b0e; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .pipeline li:first-child { color: #0b0b0e; } }
.pipeline figcaption { margin-top: 0.9rem; color: var(--ink-2); font-size: var(--step--1); }

/* Guardrails / strategies */
.rules { display: grid; gap: 1.5rem; margin-top: 1.5rem; }
@media (min-width: 48rem) { .rules { grid-template-columns: 1fr 1fr; gap: clamp(2rem, 5vw, 4rem); } }
.rules > div { border-top: 3px solid var(--ink); padding-top: 1.1rem; }
.rules > div:last-child { border-top-style: dotted; }
.rules p { color: var(--ink-2); }
.rules ul { margin: 0; padding-left: 1.1rem; }
.rules li { margin-bottom: 0.35rem; }

/* Record tree */
.tree {
  margin: 0; background: var(--panel); color: var(--panel-text);
  border-radius: var(--radius); padding: 1.25rem 1.4rem; overflow-x: auto;
  font-size: 0.86rem; line-height: 1.8; border: 1px solid var(--panel-rule);
}
.tree code { font-size: inherit; }
.tree span { color: var(--panel-muted); }
@media (max-width: 35.99rem) {
  /* Put each note under its file name so nothing runs off a phone screen */
  .tree:not(.policy) { white-space: pre-wrap; }
  .tree:not(.policy) span { display: inline-block; width: 100%; padding-left: 4ch; white-space: normal; }
}

/* Team controls */
.controls { display: grid; gap: 1.1rem; margin: 1.5rem 0; }
.controls > div { border-top: 1px solid var(--rule); padding-top: 0.9rem; }
.controls dt { font-weight: 600; margin-bottom: 0.2rem; }
.controls dd { margin: 0; color: var(--ink-2); }
#teams p code, .controls code { background: var(--paper-2); padding: 0.1em 0.35em; border-radius: var(--radius-sm); font-size: 0.86em; }
.tree.policy { line-height: 1.7; align-self: start; }
@media (min-width: 56rem) { .tree.policy { position: sticky; top: 6rem; } }

/* Layers */
.layers { display: grid; gap: 1rem; margin: 1.75rem 0 0; }
@media (min-width: 48rem) { .layers { grid-template-columns: repeat(3, 1fr); } }
.layers > div { padding: 1.1rem 0 0; border-top: 1px solid var(--rule); }
.layers dt { font-weight: 600; font-size: var(--step-1); margin-bottom: 0.25rem; }
.layers dd { margin: 0; color: var(--ink-2); }
/* News */
.news-list { list-style: none; margin: 1.75rem 0 0; padding: 0; border-top: 1px solid var(--rule); }
.news-item a {
  display: grid; gap: 0.3rem; padding: 1.25rem 0; border-bottom: 1px solid var(--rule);
  color: var(--ink); text-decoration: none;
}
.news-item a:hover .news-title { text-decoration: underline; text-decoration-thickness: 2px; text-underline-offset: 0.18em; }
.news-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 0.6rem; font-size: var(--step--1); color: var(--ink-2); margin: 0; }
.news-title { font-size: var(--step-1); font-weight: 600; letter-spacing: -0.01em; line-height: 1.3; }
.news-sub { color: var(--ink-2); max-width: 44em; }

.status {
  display: inline-block; font-family: var(--mono); font-size: 0.69rem; font-weight: 500; line-height: 1; letter-spacing: 0.08em; text-transform: uppercase;
  padding: 0.3rem 0.5rem; border-radius: var(--radius-pill); border: 1px solid currentColor;
}
.status-planned { color: var(--status-planned); }
.status-building { color: var(--status-building); }
.status-shipped { color: var(--status-shipped); background: color-mix(in srgb, var(--status-shipped) 12%, transparent); }
.status-shelved { color: var(--status-shelved); text-decoration: line-through; }
.status-draft { color: var(--ink-2); border-style: dashed; }

.page-head { padding-bottom: 1rem; }
.news-index { padding-top: 1rem; }
.status-key { display: grid; gap: 0.6rem; margin: 2rem 0 1.5rem; max-width: 44em; }
.status-key > div { display: grid; grid-template-columns: 6.5rem 1fr; gap: 1rem; align-items: baseline; }
.status-key dd { margin: 0; color: var(--ink-2); font-size: var(--step--1); }

/* Post */
.post-wrap { max-width: 46rem; }
.back { font-size: var(--step--1); margin-bottom: 2rem; }
.post-head h1 { font-size: var(--step-3); margin-top: 0.75rem; }
.post-head .lede { margin-bottom: 2rem; }
.status-box { border: 1px solid var(--rule); border-left: 3px solid var(--status-building); padding: 0.75rem 1rem; background: var(--paper-2); border-radius: var(--radius); margin-bottom: 2.25rem; font-size: var(--step--1); }
.status-box p { margin: 0; }
.status-box p + p { margin-top: 0.35rem; }
.status-box-planned { border-left-color: var(--status-planned); }
.status-box-shipped { border-left-color: var(--status-shipped); }
.status-box-shelved { border-left-color: var(--status-shelved); }
.prose { max-width: 38em; }
.prose h2 { font-size: var(--step-2); margin-top: 2em; }
.prose ul { padding-left: 1.2rem; }
.prose li { margin-bottom: 0.4rem; }
.prose pre { background: var(--panel); color: var(--panel-text); padding: 1rem 1.2rem; border-radius: var(--radius); white-space: pre-wrap; overflow-wrap: anywhere; }
.prose :not(pre) > code { background: var(--paper-2); padding: 0.1em 0.35em; border-radius: var(--radius-sm); }
.faq { margin-top: 3rem; border-top: 1px solid var(--rule); padding-top: 2rem; }
.faq h2 { font-size: var(--step-2); }
.faq-item { padding: 1rem 0; border-bottom: 1px solid var(--rule); }
.faq-item h3 { font-size: var(--step-0); font-weight: 600; margin-bottom: 0.4rem; }
.faq-item .prose p:last-child { margin-bottom: 0; }

/* Footer */
.colophon { border-top: 1px solid var(--rule); padding: 2.5rem 0 3rem; font-size: var(--step--1); color: var(--ink-2); }
.colophon-inner { display: grid; gap: 1rem; }
@media (min-width: 48rem) { .colophon-inner { grid-template-columns: 1fr auto; } .colophon-inner .small { grid-column: 1 / -1; } }
.colophon p { margin: 0; display: flex; align-items: center; gap: 0.5rem; }
.colophon .mark { color: var(--link); flex: none; width: 26px; height: 26px; }
.colophon ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 1.25rem; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}

/* Home page explainers, the masthead theme switcher and the navy masthead. */
/* Masthead: navy in both themes, with the mark in white and the O in signal */
.masthead { background: #0e3a5f; backdrop-filter: none; color: #eaf1f7; border-bottom: 1px solid #1f547f; }
.masthead-inner { display: flex; align-items: center; justify-content: space-between; height: var(--masthead-height); gap: 1rem; }
.brand { display: inline-flex; align-items: center; gap: 0.5rem; color: #ffffff; text-decoration: none; font-weight: 600; font-size: 1.25rem; letter-spacing: -0.01em; line-height: 1; }
.brand .mark { width: 48px; height: 48px; display: block; color: #ffffff; }
.masthead nav { display: flex; gap: clamp(0.75rem, 3vw, 1.5rem); font-weight: 500; font-size: 0.95rem; }
.masthead nav a { color: #9bbad0; text-decoration: none; white-space: nowrap; }
.masthead nav a:hover { color: #ffffff; text-decoration: underline; text-decoration-thickness: 2px; text-underline-offset: 0.4em; text-decoration-color: #10b981; }
.mast-right { display: flex; align-items: center; gap: 0.6rem; }
.theme { display: inline-flex; align-items: center; gap: 0.4rem; font: 500 0.8rem/1 var(--sans); color: #eaf1f7; background: #1f547f; border: 1px solid #3f719a; border-radius: var(--radius-pill); padding: 0.4rem 0.7rem; cursor: pointer; white-space: nowrap; }
.theme:hover { color: #ffffff; border-color: #10b981; }
.theme svg { width: 16px; height: 16px; }
.theme .ico { display: none; } .theme[data-mode="auto"] .ico-auto, .theme[data-mode="light"] .ico-light, .theme[data-mode="dark"] .ico-dark { display: block; }
@media (max-width: 40rem) { .masthead nav { gap: 1rem; font-size: var(--step--1); } .masthead nav a[href="/#compass"] { display: none; } .theme .theme-label { display: none; } }

.product .from { font-weight: 400; color: var(--ink-2); }

/* Chapters */
.page-nav { padding: 0 0 clamp(2rem, 4vw, 3rem); }
@media (min-width: 62rem) { .page-nav .chapters { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.chapters { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.35rem 1.5rem; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); counter-reset: ch; }
.chapters a { display: flex; gap: 0.6rem; color: var(--ink-2); text-decoration: none; font-size: 0.95rem; padding: 0.25rem 0; border-top: 1px solid var(--rule); }
.chapters a::before { counter-increment: ch; content: counter(ch); font-family: var(--mono); color: var(--link); font-weight: 500; }
.chapters a:hover { color: var(--ink); }
.chapter { padding-block: 3rem; }
@media (min-width: 48rem) { .chapter { padding-block: clamp(3rem, 7vw, 5.5rem); } }
.chapter.tinted { background: var(--page-alt); }
.chapter-grid { display: grid; gap: 2rem clamp(2rem, 5vw, 4rem); align-items: start; }
@media (min-width: 60rem) { .chapter-grid { grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr); } .chapter-grid.flip { grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr); } .chapter-grid.flip > .chapter-copy { order: 2; } }
.chapter-grid > * { min-width: 0; }
.chapter-copy { max-width: 38em; }
.chapter .num { font-family: var(--mono); color: var(--link); font-weight: 500; font-size: 0.95rem; margin: 0 0 0.75rem; }
.rules { border-top: 3px solid var(--ink); padding: 1rem 0 0; margin: 1.5rem 0 0; background: none; border-radius: 0; }
.rules.soft { border-top-style: dotted; background: none; }
.rules dt { font-weight: 600; } .rules dd { margin: 0.25rem 0 0; color: var(--ink-2); }

.inst-head { display: flex; align-items: center; justify-content: space-between; gap: 0.75rem; margin-bottom: 0.6rem; font-size: 0.78rem; color: var(--panel-muted); flex-wrap: wrap; }
.inst-head .cap { margin: 0; min-width: 0; font-weight: 600; font-size: 0.875rem; color: var(--panel-text); }
.inst-ctl { display: flex; align-items: center; gap: 0.6rem; flex: 1 1 14rem; }
.inst-ctl input[type=range] { flex: 1; min-width: 6rem; accent-color: var(--needle); margin: 0; }
.replay { font: 500 0.8rem/1 var(--sans); background: transparent; color: var(--needle); border: 1px solid var(--panel-rule); border-radius: var(--radius-sm); padding: 0.45rem 0.7rem; cursor: pointer; white-space: nowrap; }
.replay:hover { border-color: var(--needle); }
.chips { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 0.8rem; }
.chips button { font: 500 0.875rem/1.2 var(--sans); color: var(--panel-text); background: var(--panel-2); border: 1px solid var(--panel-rule); border-radius: var(--radius-pill); padding: 0.35rem 0.75rem; cursor: pointer; }
.chips button:hover { border-color: var(--needle); }
.chips button[aria-pressed="true"] { background: var(--needle); color: var(--needle-ink); border-color: var(--needle); font-weight: 600; }
.inst-note { margin: 0.9rem 0 0; font-size: 0.78rem; color: var(--panel-muted); }
.inst-note code { background: var(--panel-2); color: var(--panel-text); }

/* SVG palette, through tokens */
.n { fill: var(--needle); } .ns { stroke: var(--needle); fill: none; }
.s { fill: var(--sky); } .ss { stroke: var(--sky); fill: none; }
.cu { fill: var(--amber); } .cus { stroke: var(--amber); fill: none; }
.t { fill: var(--panel-text); } .m { fill: var(--panel-muted); } .h { fill: var(--panel-heading); }
.rs { stroke: var(--panel-rule); fill: none; } .r2 { fill: var(--panel-2); }
.mono { font-family: var(--mono); } .serif { font-family: var(--sans); font-weight: 600; letter-spacing: -0.01em; }
.fill-quick { fill: var(--sky); } .fill-regular { fill: var(--needle); } .fill-full { fill: var(--panel-heading); }
.approve { fill: var(--amber); }
svg text { font-size: 14px; }

/* Compass 7.0.0 post: the animated figure (src/assets/js/compass-7-anim.js). Tokens scoped as --ca-*. */
  :root {
    --ca-bg: #FFFFFF; --ca-bg-subtle: #FAFAFA; --ca-bg-muted: #F4F4F5;
    --ca-fg: #18181B; --ca-fg-muted: #52525B; --ca-fg-subtle: #71717A;
    --ca-border: #E4E4E7; --ca-border-strong: #D4D4D8;
    --ca-primary: #0E3A5F; --ca-accent: #10B981;
    --ca-ok-fill: #E7F8F0; --ca-ok-fg: #0B7A57;
    --ca-ring: rgba(14,58,95,0.38);
  }
  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
      --ca-bg: #0B0B0E; --ca-bg-subtle: #18181B; --ca-bg-muted: #1F1F22;
      --ca-fg: #FAFAFA; --ca-fg-muted: #A1A1AA; --ca-fg-subtle: #71717A;
      --ca-border: #27272A; --ca-border-strong: #3F3F46;
      --ca-primary: #6A95B6; --ca-accent: #2EB87A;
      --ca-ok-fill: rgba(46,184,122,0.14); --ca-ok-fg: #5DCC95;
      --ca-ring: rgba(46,184,122,0.5);
    }
  }
  :root[data-theme="dark"] {
    --ca-bg: #0B0B0E; --ca-bg-subtle: #18181B; --ca-bg-muted: #1F1F22;
    --ca-fg: #FAFAFA; --ca-fg-muted: #A1A1AA; --ca-fg-subtle: #71717A;
    --ca-border: #27272A; --ca-border-strong: #3F3F46;
    --ca-primary: #6A95B6; --ca-accent: #2EB87A;
    --ca-ok-fill: rgba(46,184,122,0.14); --ca-ok-fg: #5DCC95;
    --ca-ring: rgba(46,184,122,0.5);
  }

  .ca { margin: 32px 0; font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; color: var(--ca-fg); }
  .ca-stage { border: 1px solid var(--ca-border); border-radius: 6px; background: var(--ca-bg); overflow: hidden; }
  .ca svg { display: block; width: 100%; height: auto; }
  .ca svg text { font-family: 'IBM Plex Mono', ui-monospace, 'SF Mono', Menlo, monospace; font-variant-numeric: tabular-nums; }
  .ca svg .sans { font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; }
  .ca-caption { margin: 12px 0 0; min-height: 3.3em; font-size: 15px; line-height: 1.65; transition: opacity .25s ease; }
  .ca-caption code { font-family: 'IBM Plex Mono', ui-monospace, monospace; font-size: 0.9em; background: var(--ca-bg-muted); border-radius: 4px; padding: 1px 4px; }
  .ca-controls { display: flex; align-items: center; gap: 8px; margin-top: 8px; }
  .ca button { appearance: none; border: 1px solid var(--ca-border); background: var(--ca-bg-subtle); color: var(--ca-fg-muted); width: 32px; height: 32px; border-radius: 4px; display: grid; place-items: center; cursor: pointer; padding: 0; flex: none; }
  .ca button:hover { color: var(--ca-fg); border-color: var(--ca-border-strong); }
  .ca button:focus-visible, .ca input:focus-visible { outline: 3px solid var(--ca-ring); outline-offset: 1px; }
  .ca button svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
  .ca input[type=range] { flex: 1; accent-color: var(--ca-accent); min-width: 0; }
  .ca-sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }