/* NavMuseum — site styles.
   Identity: observatory × maritime museum × modern instrument. Night (default) and chart-paper themes.
   Figures are always "instrument panels" on midnight, in both themes. Tokens: design-spec.md. */

@font-face { font-family: "Instrument Serif"; src: url("../fonts/instrument-serif-latin-400-normal.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: "Instrument Serif"; src: url("../fonts/instrument-serif-latin-400-italic.woff2") format("woff2"); font-weight: 400; font-style: italic; font-display: swap; }
@font-face { font-family: "IBM Plex Sans"; src: url("../fonts/ibm-plex-sans-latin-400-normal.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: "IBM Plex Sans"; src: url("../fonts/ibm-plex-sans-latin-400-italic.woff2") format("woff2"); font-weight: 400; font-style: italic; font-display: swap; }
@font-face { font-family: "IBM Plex Sans"; src: url("../fonts/ibm-plex-sans-latin-500-normal.woff2") format("woff2"); font-weight: 500; font-style: normal; font-display: swap; }
@font-face { font-family: "IBM Plex Sans"; src: url("../fonts/ibm-plex-sans-latin-600-normal.woff2") format("woff2"); font-weight: 600; font-style: normal; font-display: swap; }
@font-face { font-family: "IBM Plex Mono"; src: url("../fonts/ibm-plex-mono-latin-400-normal.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: "IBM Plex Mono"; src: url("../fonts/ibm-plex-mono-latin-500-normal.woff2") format("woff2"); font-weight: 500; font-style: normal; font-display: swap; }

@font-face { font-family: "IBM Plex Sans"; src: url("../fonts/ibm-plex-sans-latin-ext-400-normal.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2C60-2C7F,U+A720-A7FF; }
@font-face { font-family: "IBM Plex Sans"; src: url("../fonts/ibm-plex-sans-latin-ext-500-normal.woff2") format("woff2"); font-weight: 500; font-style: normal; font-display: swap; unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2C60-2C7F,U+A720-A7FF; }
@font-face { font-family: "IBM Plex Sans"; src: url("../fonts/ibm-plex-sans-latin-ext-600-normal.woff2") format("woff2"); font-weight: 600; font-style: normal; font-display: swap; unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2C60-2C7F,U+A720-A7FF; }
@font-face { font-family: "IBM Plex Sans"; src: url("../fonts/ibm-plex-sans-latin-ext-400-italic.woff2") format("woff2"); font-weight: 400; font-style: italic; font-display: swap; unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2C60-2C7F,U+A720-A7FF; }
@font-face { font-family: "Instrument Serif"; src: url("../fonts/instrument-serif-latin-ext-400-normal.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2C60-2C7F,U+A720-A7FF; }
@font-face { font-family: "Instrument Serif"; src: url("../fonts/instrument-serif-latin-ext-400-italic.woff2") format("woff2"); font-weight: 400; font-style: italic; font-display: swap; unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2C60-2C7F,U+A720-A7FF; }

/* IBM Plex lacks the ʻokina (U+02BB); borrow Instrument Serif's glyph for just that code point. */
@font-face { font-family: "Okina"; src: url("../fonts/instrument-serif-latin-400-normal.woff2") format("woff2"); unicode-range: U+02BB-02BC; font-display: swap; }

:root {
  /* palette (handoff §12) */
  --midnight: #091D2D;
  --deep: #16384D;
  --deeper: #0D2638;
  --paper: #E9E1CE;
  --brass: #D49B4D;
  --cyan: #7CDBDF;
  --warm: #F0E8D8;
  --coral: #EE8B74;
  --violet: #B7A6EC;
  --sage: #A9CF8E;

  /* instrument panel tokens: identical in both themes (figures are always night instruments) */
  --fig-bg: #071826;
  --fig-surface: #0D2435;
  --fig-grid: rgba(124, 219, 223, 0.14);
  --fig-grid-strong: rgba(124, 219, 223, 0.32);
  --fig-ink: #F0E8D8;
  --fig-muted: #9DB3BF;
  --fig-land: #1E4256;
  --fig-land-edge: rgba(233, 225, 206, 0.42);
  --fig-ocean: #0A2233;
  --fig-night: rgba(2, 8, 14, 0.62);
  --c-geom: var(--cyan);      /* primary geometry, constraints */
  --c-ref: var(--brass);      /* reference body / instrument / Sun */
  --c-second: var(--coral);   /* second constraint, errors */
  --c-third: var(--violet);   /* third constraint */
  --c-ok: var(--sage);

  /* night theme (default) */
  --bg: var(--midnight);
  --bg-2: #0C2335;
  --surface: #102A3D;
  --ink: #F0E8D8;
  --ink-2: #D9D0BE;
  --muted: #A3B5BF;
  --rule: rgba(233, 225, 206, 0.16);
  --accent: #7CDBDF;
  --accent-2: #D49B4D;
  --link: #8FE3E6;
  --focus: #F2C36B;
  --aside-bg: rgba(212, 155, 77, 0.08);
  --aside-edge: rgba(212, 155, 77, 0.55);
  --code-bg: rgba(124, 219, 223, 0.08);

  --font-display: "Instrument Serif", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --font-body: "Okina", "IBM Plex Sans", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "Okina", "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --prose: 40rem;
  --wide: 70rem;
  --gutter: clamp(16px, 4vw, 40px);
  --radius: 6px;
  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg: #E9E1CE;
  --bg-2: #E2D8C2;
  --surface: #F3EDE0;
  --ink: #1B2730;
  --ink-2: #2A3943;
  --muted: #5A6670;
  --rule: rgba(22, 56, 77, 0.2);
  --accent: #155E70;
  --accent-2: #8A5A1C;
  --link: #0F5868;
  --focus: #8A5A1C;
  --aside-bg: rgba(138, 90, 28, 0.08);
  --aside-edge: rgba(138, 90, 28, 0.6);
  --code-bg: rgba(22, 56, 77, 0.07);
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-padding-top: 72px; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 400 1.0625rem/1.68 var(--font-body);
  font-feature-settings: "kern", "liga";
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
@media (min-width: 720px) { body { font-size: 1.125rem; } }
img, svg, canvas { max-width: 100%; }
a { color: var(--link); text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; border-radius: 2px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--focus); color: #000; padding: 8px 12px; z-index: 100; }
.skip:focus { left: 8px; }
::selection { background: rgba(124, 219, 223, 0.35); }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 10px var(--gutter);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}
.wordmark { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; min-width: 0; }
.wm-mark { width: 26px; height: 26px; color: var(--accent-2); flex: none; }
.wm-text { font-family: var(--font-display); font-size: 1.2rem; line-height: 1.1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.wm-text em { color: var(--accent-2); }
.site-nav { display: flex; align-items: center; gap: 4px; position: relative; }
.site-nav > a, .nav-toggle, .theme-toggle {
  font: 500 0.875rem/1 var(--font-body); color: var(--ink-2); text-decoration: none;
  background: none; border: 1px solid transparent; border-radius: 999px; padding: 9px 12px; cursor: pointer;
  min-height: 36px;
}
.site-nav > a:hover, .nav-toggle:hover, .theme-toggle:hover { border-color: var(--rule); color: var(--ink); }
.site-nav > a[aria-current="page"] { color: var(--accent); }
.theme-toggle { padding: 8px; display: inline-flex; }
.theme-toggle svg { width: 18px; height: 18px; }
.nav-list {
  display: none; position: absolute; right: 0; top: calc(100% + 10px); margin: 0; padding: 10px;
  list-style: none; background: var(--surface); border: 1px solid var(--rule); border-radius: 10px;
  width: min(22rem, calc(100vw - 32px)); box-shadow: 0 20px 50px rgba(0,0,0,.35);
}
.nav-list.open { display: block; }
.nav-list a { display: flex; gap: 12px; padding: 9px 10px; border-radius: 6px; color: var(--ink); text-decoration: none; font-size: 0.95rem; line-height: 1.3; }
.nav-list a:hover, .nav-list a[aria-current="page"] { background: var(--code-bg); }
.nav-n { font-family: var(--font-mono); color: var(--accent-2); font-size: 0.8rem; min-width: 1.4em; padding-top: 2px; }
@media (max-width: 640px) {
  .wm-text { font-size: 1.02rem; }
  .nav-lab, .nav-sources { display: none; }
}
@media (max-width: 420px) { .wm-text { max-width: 46vw; } }

/* ---------- typography ---------- */
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 400; line-height: 1.08; letter-spacing: -0.005em; color: var(--ink); text-wrap: balance; }
h1 { font-size: clamp(2.6rem, 7vw, 5rem); margin: 0 0 0.3em; }
h2 { font-size: clamp(1.9rem, 4vw, 2.6rem); margin: 2.4em 0 0.5em; }
h3 { font-size: clamp(1.4rem, 2.6vw, 1.7rem); margin: 1.8em 0 0.4em; }
h4 { font-family: var(--font-body); font-weight: 600; font-size: 1rem; margin: 1.6em 0 0.4em; letter-spacing: 0.01em; }
.h-anchor { margin-left: 0.35em; font-size: 0.6em; color: var(--muted); text-decoration: none; opacity: 0; transition: opacity .15s; }
h2:hover .h-anchor, h3:hover .h-anchor { opacity: 1; }
.kicker { font: 500 0.78rem/1.4 var(--font-mono); text-transform: uppercase; letter-spacing: 0.14em; color: var(--accent-2); margin: 0 0 1rem; }
.kicker span { color: var(--accent); margin-right: 0.8em; }
.dek { font-family: var(--font-display); font-size: clamp(1.3rem, 2.6vw, 1.75rem); line-height: 1.3; color: var(--ink-2); max-width: 38rem; margin: 0 0 1.2rem; text-wrap: pretty; }
.meta-line { font: 400 0.8rem/1.4 var(--font-mono); color: var(--muted); letter-spacing: 0.04em; }
.small { font-size: 0.88rem; color: var(--muted); }
.kbd { font-family: var(--font-mono); font-size: 0.85em; border: 1px solid var(--rule); border-radius: 4px; padding: 0 5px; }

/* ---------- prose ---------- */
.prose { max-width: var(--prose); margin: 0 auto; padding: 0 var(--gutter); box-sizing: content-box; }
.prose > p, .prose li { text-wrap: pretty; hyphens: auto; }
.prose p { margin: 0 0 1.15em; }
.prose strong { font-weight: 600; color: var(--ink); }
.prose em { font-style: italic; }
.prose ul, .prose ol { padding-left: 1.3em; margin: 0 0 1.2em; }
.prose li { margin-bottom: 0.35em; }
.prose blockquote { margin: 1.6em 0; padding: 0 0 0 1.2em; border-left: 2px solid var(--accent-2); font-family: var(--font-display); font-size: 1.35rem; line-height: 1.35; color: var(--ink-2); }
.prose blockquote cite { display: block; font: 400 0.85rem/1.4 var(--font-body); color: var(--muted); margin-top: 0.4em; font-style: normal; }
.prose code { font-family: var(--font-mono); font-size: 0.88em; background: var(--code-bg); padding: 0.05em 0.3em; border-radius: 3px; }
.prose hr { border: 0; border-top: 1px solid var(--rule); margin: 3em 0; }
.prose .lede::first-letter { font-family: var(--font-display); float: left; font-size: 4.4em; line-height: 0.82; padding: 0.06em 0.1em 0 0; color: var(--accent-2); }
.prose table { width: 100%; border-collapse: collapse; margin: 1.4em 0; font-size: 0.92rem; }
.prose th, .prose td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--rule); vertical-align: top; }
.prose th { font-family: var(--font-mono); font-weight: 500; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }
.table-wrap { overflow-x: auto; }
.num, .mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; font-size: 0.92em; }
var { font-family: var(--font-display); font-style: italic; font-size: 1.12em; }
.cite { line-height: 0; }
.cite a { font: 500 0.7em/1 var(--font-mono); text-decoration: none; color: var(--accent-2); margin-left: 1px; }
a.term { color: inherit; text-decoration: underline dotted var(--muted); text-underline-offset: 0.22em; }
.callout { border: 1px solid var(--rule); border-radius: var(--radius); padding: 1rem 1.2rem; margin: 1.6em 0; background: var(--bg-2); }
.callout > :last-child { margin-bottom: 0; }

/* equations */
.eq {
  font-family: var(--font-display); font-size: clamp(1.25rem, 2.6vw, 1.6rem); line-height: 1.4; text-align: center;
  margin: 1.4em 0; padding: 0.7em 1em; border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule);
  position: relative; overflow-x: auto;
}
.eq var { font-size: 1em; }
.eq .op { font-family: var(--font-body); font-weight: 300; padding: 0 0.2em; }
.eq-label { position: absolute; right: 0.4em; top: 50%; transform: translateY(-50%); font: 400 0.75rem var(--font-mono); color: var(--muted); }
.frac { display: inline-flex; flex-direction: column; vertical-align: middle; text-align: center; font-size: 0.86em; }
.frac > span:first-child { border-bottom: 1px solid currentColor; padding: 0 0.2em; }

/* asides */
.simplification, .aside {
  margin: 1.8em 0; padding: 1rem 1.2rem; background: var(--aside-bg); border-left: 3px solid var(--aside-edge);
  border-radius: 0 var(--radius) var(--radius) 0; font-size: 0.94rem; line-height: 1.6;
}
.simplification p { margin: 0 0 0.6em; }
.simplification p:last-child { margin: 0; }
.simplification strong { font: 500 0.72rem/1 var(--font-mono); text-transform: uppercase; letter-spacing: 0.1em; color: var(--accent-2); margin-right: 0.4em; }
.evidence {
  display: inline-block; font: 500 0.66rem/1 var(--font-mono); text-transform: uppercase; letter-spacing: 0.1em;
  padding: 4px 7px 3px; border-radius: 999px; border: 1px solid; vertical-align: 0.15em; margin: 0 0.2em; cursor: help;
}
.ev-documented { color: var(--sage); border-color: color-mix(in srgb, var(--sage) 60%, transparent); }
.ev-reconstructed { color: var(--cyan); border-color: color-mix(in srgb, var(--cyan) 60%, transparent); }
.ev-contested { color: var(--coral); border-color: color-mix(in srgb, var(--coral) 60%, transparent); }
.ev-illustrative { color: var(--violet); border-color: color-mix(in srgb, var(--violet) 60%, transparent); }
:root[data-theme="light"] .ev-documented { color: #3F6B25; }
:root[data-theme="light"] .ev-reconstructed { color: #155E70; }
:root[data-theme="light"] .ev-contested { color: #A33A22; }
:root[data-theme="light"] .ev-illustrative { color: #5B47A8; }

/* ---------- chapter layout ---------- */
.chapter-head { position: relative; padding: clamp(48px, 10vw, 120px) var(--gutter) clamp(28px, 5vw, 56px); max-width: var(--wide); margin: 0 auto; }
.chapter-head-text { position: relative; z-index: 1; max-width: 46rem; }
.chapter-hero { position: absolute; inset: 0 0 0 40%; opacity: 0.9; pointer-events: none; }
.chapter-hero .widget-mount { width: 100%; height: 100%; }
@media (max-width: 820px) { .chapter-hero { inset: 0; opacity: 0.32; } }
.chapter-grid { position: relative; }
.toc { display: none; }
@media (min-width: 1320px) {
  .toc { display: block; position: absolute; left: max(16px, calc(50% - var(--prose) / 2 - 18rem)); top: 0; bottom: 0; width: 14rem; }
  .toc > * { position: sticky; top: 90px; }
  .toc-h { font: 500 0.7rem/1 var(--font-mono); text-transform: uppercase; letter-spacing: 0.14em; color: var(--muted); margin: 0 0 12px; }
  .toc ol { list-style: none; margin: 0; padding: 0; position: sticky; top: 112px; counter-reset: toc; }
  .toc li { counter-increment: toc; }
  .toc a { display: block; padding: 5px 0 5px 12px; border-left: 1px solid var(--rule); color: var(--muted); text-decoration: none; font-size: 0.85rem; line-height: 1.35; }
  .toc a:hover, .toc a.active { color: var(--ink); border-left-color: var(--accent-2); }
}
.chapter-foot { margin-top: 5rem; padding-bottom: 3rem; }
.foot-section { margin-top: 3rem; }
.foot-section h2 { font-size: 1.6rem; margin-top: 0; }
.refs { font-size: 0.9rem; line-height: 1.55; padding-left: 1.6em; }
.refs li { margin-bottom: 0.6em; }
.refs li:target { background: var(--aside-bg); }
.ref-note { color: var(--muted); }
.ref-type { font: 400 0.68rem/1 var(--font-mono); text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); border: 1px solid var(--rule); border-radius: 3px; padding: 2px 4px; }
.simp-list { font-size: 0.92rem; }
.cite-block { font-size: 0.92rem; padding: 0.9rem 1rem; border: 1px dashed var(--rule); border-radius: var(--radius); }
.chapter-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 3rem; }
.chapter-nav a { display: block; padding: 1rem 1.1rem; border: 1px solid var(--rule); border-radius: var(--radius); text-decoration: none; color: var(--ink); font-family: var(--font-display); font-size: 1.3rem; line-height: 1.2; }
.chapter-nav a span { display: block; font: 500 0.72rem/1.4 var(--font-mono); text-transform: uppercase; letter-spacing: 0.1em; color: var(--accent-2); margin-bottom: 4px; }
.chapter-nav a:hover { border-color: var(--accent-2); }
.chapter-nav .next { text-align: right; }

/* plain pages */
.plain-head { max-width: var(--prose); margin: 0 auto; padding: clamp(48px, 9vw, 100px) var(--gutter) 1.5rem; box-sizing: content-box; }
.plain-head h1 { font-size: clamp(2.4rem, 6vw, 3.8rem); }
.plain-page { padding-bottom: 4rem; }
.app-page { padding-bottom: 4rem; }
.app-head { max-width: var(--wide); margin: 0 auto; padding: clamp(32px, 6vw, 64px) var(--gutter) 1rem; }
.app-head h1 { font-size: clamp(2.2rem, 5vw, 3.4rem); }

/* ---------- figures (instrument panels) ---------- */
.figure {
  margin: 2.4em calc(-1 * var(--gutter)); padding: 0;
  color: var(--fig-ink); position: relative;
}
@media (min-width: 760px) {
  .figure { margin: 2.6em 0; }
  .figure.wide { width: min(var(--wide), calc(100vw - 2 * var(--gutter))); margin-left: 50%; transform: translateX(-50%); }
}
.widget-mount {
  background: var(--fig-bg); border: 1px solid rgba(124, 219, 223, 0.16); min-height: var(--fig-h, 200px);
  position: relative; overflow: hidden;
}
@media (min-width: 760px) { .widget-mount { border-radius: 8px; } }
:root[data-theme="light"] .widget-mount { box-shadow: 0 10px 30px rgba(9, 29, 45, 0.22); }
.figure figcaption { font-size: 0.86rem; line-height: 1.55; color: var(--muted); padding: 0.7rem var(--gutter) 0; max-width: 46rem; }
@media (min-width: 760px) { .figure figcaption { padding: 0.75rem 0 0; } }
.fig-n { font: 500 0.72rem/1 var(--font-mono); text-transform: uppercase; letter-spacing: 0.12em; color: var(--accent-2); margin-right: 0.5em; }
.fig-link { margin-left: 0.4em; color: var(--muted); text-decoration: none; font-family: var(--font-mono); }
.noscript { padding: 1.5rem; color: var(--fig-muted); }
.figure:not(.ready) .widget-mount { min-height: var(--fig-h, 460px); }

/* widget internals: a canvas/SVG stage + a control deck */
.w { display: grid; grid-template-columns: 1fr; color: var(--fig-ink); font-family: var(--font-body); font-size: 0.9rem; }
.w-stage { position: relative; min-height: 260px; touch-action: none; }
.w-stage canvas, .w-stage svg.w-svg { display: block; width: 100%; height: 100%; position: absolute; inset: 0; }
.w-stage.ratio { height: auto; }
.w-split { display: grid; grid-template-columns: 1fr; }
@media (min-width: 760px) { .w-split { grid-template-columns: 1fr 1fr; } .w-split > * + * { border-left: 1px solid var(--fig-grid); } }
@media (max-width: 759px) { .w-split > * + * { border-top: 1px solid var(--fig-grid); } }
.w-panel-label { position: absolute; left: 12px; top: 10px; font: 500 0.66rem/1 var(--font-mono); text-transform: uppercase; letter-spacing: 0.14em; color: var(--fig-muted); pointer-events: none; z-index: 2; }
.w-deck {
  display: flex; flex-wrap: wrap; gap: 10px 18px; align-items: flex-end; padding: 12px 14px 14px;
  border-top: 1px solid var(--fig-grid); background: var(--fig-surface);
}
.w-ctl { display: flex; flex-direction: column; gap: 4px; min-width: 150px; flex: 1 1 170px; }
.w-ctl.narrow { flex: 0 1 auto; min-width: 0; }
.w-ctl label, .w-ctl .w-lab { font: 500 0.68rem/1.2 var(--font-mono); text-transform: uppercase; letter-spacing: 0.1em; color: var(--fig-muted); display: flex; justify-content: space-between; gap: 8px; }
.w-ctl output, .w-val { font-family: var(--font-mono); color: var(--fig-ink); text-transform: none; letter-spacing: 0; font-size: 0.78rem; }
.w-row { display: flex; align-items: center; gap: 8px; }
.w input[type="range"] { flex: 1; min-width: 0; accent-color: var(--brass); height: 28px; margin: 0; cursor: pointer; }
.w input[type="number"] {
  width: 5.4em; font: 400 0.8rem var(--font-mono); color: var(--fig-ink); background: var(--fig-bg);
  border: 1px solid var(--fig-grid-strong); border-radius: 4px; padding: 4px 5px;
}
.w select {
  font: 400 0.82rem var(--font-body); color: var(--fig-ink); background: var(--fig-bg);
  border: 1px solid var(--fig-grid-strong); border-radius: 4px; padding: 6px 8px; min-height: 34px;
}
.w-btn {
  font: 500 0.8rem/1 var(--font-body); color: var(--fig-ink); background: transparent;
  border: 1px solid var(--fig-grid-strong); border-radius: 999px; padding: 9px 14px; cursor: pointer; min-height: 36px;
  display: inline-flex; align-items: center; gap: 6px; white-space: nowrap;
}
.w-btn:hover { border-color: var(--brass); color: #fff; }
.w-btn[aria-pressed="true"] { background: rgba(212, 155, 77, 0.18); border-color: var(--brass); color: #FCE6C4; }
.w-btn.primary { background: var(--brass); color: #1a1206; border-color: var(--brass); }
.w-btn.primary:hover { background: #E2AE63; color: #000; }
.w-btns { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.w-seg { display: inline-flex; border: 1px solid var(--fig-grid-strong); border-radius: 999px; overflow: hidden; }
.w-seg button { font: 500 0.78rem/1 var(--font-body); background: none; color: var(--fig-muted); border: 0; padding: 9px 12px; cursor: pointer; min-height: 34px; }
.w-seg button + button { border-left: 1px solid var(--fig-grid-strong); }
.w-seg button[aria-pressed="true"] { background: rgba(124, 219, 223, 0.16); color: var(--fig-ink); }
.w-check { display: inline-flex; align-items: center; gap: 7px; font-size: 0.82rem; color: var(--fig-ink); cursor: pointer; min-height: 34px; }
.w-check input { accent-color: var(--cyan); width: 16px; height: 16px; }
.w-readout {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 1px; background: var(--fig-grid);
  border-top: 1px solid var(--fig-grid);
}
.w-readout > div { background: var(--fig-bg); padding: 9px 12px; }
.w-readout dt, .w-readout .k { font: 500 0.62rem/1.2 var(--font-mono); text-transform: uppercase; letter-spacing: 0.12em; color: var(--fig-muted); margin: 0 0 3px; }
.w-readout dd, .w-readout .v { margin: 0; font: 400 0.98rem/1.25 var(--font-mono); font-variant-numeric: tabular-nums; color: var(--fig-ink); }
.w-readout .v.geom { color: var(--cyan); } .w-readout .v.third { color: var(--violet); } .w-readout .v.ref { color: var(--brass); } .w-readout .v.second { color: var(--coral); } .w-readout .v.ok { color: var(--sage); }
.w-eq { padding: 10px 14px; font-family: var(--font-display); font-size: 1.2rem; color: var(--fig-ink); border-top: 1px solid var(--fig-grid); background: var(--fig-bg); overflow-x: auto; white-space: nowrap; }
.w-eq var { color: var(--cyan); }
.w-eq .b { color: var(--brass); }
.w-note { padding: 8px 14px 10px; font-size: 0.82rem; color: var(--fig-muted); border-top: 1px solid var(--fig-grid); background: var(--fig-bg); }
.w-note strong { color: var(--fig-ink); font-weight: 500; }
.w-toolbar { position: absolute; right: 8px; top: 8px; display: flex; gap: 6px; z-index: 3; }
.w-toolbar .w-btn { padding: 6px 10px; min-height: 30px; font-size: 0.72rem; background: rgba(7, 24, 38, 0.75); backdrop-filter: blur(4px); }
.w-toast { position: absolute; right: 10px; top: 46px; z-index: 4; background: var(--brass); color: #1a1206; font: 500 0.75rem var(--font-body); padding: 6px 10px; border-radius: 4px; }
.w-hint { position: absolute; left: 50%; bottom: 12px; transform: translateX(-50%); font: 400 0.75rem/1 var(--font-mono); color: var(--fig-muted); background: rgba(7, 24, 38, 0.8); padding: 7px 10px; border-radius: 999px; pointer-events: none; transition: opacity .6s; white-space: nowrap; z-index: 2; }
.w-hint.gone { opacity: 0; }
.w-tabs { display: flex; gap: 0; border-bottom: 1px solid var(--fig-grid); background: var(--fig-surface); overflow-x: auto; }
.w-tabs button { font: 500 0.8rem/1 var(--font-body); color: var(--fig-muted); background: none; border: 0; border-bottom: 2px solid transparent; padding: 12px 14px; cursor: pointer; white-space: nowrap; }
.w-tabs button[aria-selected="true"] { color: var(--fig-ink); border-bottom-color: var(--brass); }
.okina { margin: 0 -0.14em 0 -0.1em; }
.nocase { text-transform: none; letter-spacing: 0; font-family: var(--font-display); font-size: 1.25em; font-style: italic; }
.sr-only { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

/* ---------- home ---------- */
.home-hero { position: relative; min-height: min(92vh, 900px); display: grid; align-items: end; overflow: hidden; border-bottom: 1px solid var(--rule); background: #050f18; color: var(--warm); }
.home-hero .hero-stage { position: absolute; inset: 0; }
.home-hero .hero-stage .widget-mount { position: absolute; inset: 0; border: 0; border-radius: 0; min-height: 0; background: transparent; }
.hero-copy { position: relative; z-index: 2; padding: 0 var(--gutter) clamp(28px, 6vw, 64px); max-width: var(--wide); width: 100%; margin: 0 auto; pointer-events: none; }
.hero-copy > * { pointer-events: auto; }
.hero-copy h1 { font-size: clamp(2.7rem, 8.4vw, 6.4rem); max-width: 11ch; margin-bottom: 0.2em; color: var(--warm); text-shadow: 0 2px 30px rgba(0,0,0,.6); }
.hero-copy h1 em { color: var(--brass); }
.hero-copy .dek { color: #DCD3C1; max-width: 32rem; text-shadow: 0 1px 16px rgba(0,0,0,.7); }
.hero-copy .kicker { color: var(--brass); }
.hero-cta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 1.4rem; }
.btn { display: inline-flex; align-items: center; gap: 8px; font: 500 0.95rem/1 var(--font-body); padding: 14px 20px; border-radius: 999px; text-decoration: none; border: 1px solid rgba(240,232,216,.35); color: var(--warm); background: rgba(5, 15, 24, 0.55); backdrop-filter: blur(6px); }
.btn:hover { border-color: var(--brass); }
.btn.primary { background: var(--brass); color: #1a1206; border-color: var(--brass); }
.btn.primary:hover { background: #E2AE63; }
.section { max-width: var(--wide); margin: 0 auto; padding: clamp(56px, 9vw, 110px) var(--gutter); }
.section-h { font-size: clamp(2.1rem, 5vw, 3.4rem); margin: 0 0 0.4em; max-width: 20ch; }
.section-dek { font-size: 1.15rem; color: var(--ink-2); max-width: 40rem; }
.chapter-cards { list-style: none; margin: 2.4rem 0 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 19rem), 1fr)); gap: 1px; background: var(--rule); border: 1px solid var(--rule); border-radius: 10px; overflow: hidden; }
.chapter-cards li { background: var(--bg); }
.chapter-cards a { display: flex; flex-direction: column; height: 100%; padding: 1.4rem 1.4rem 1.5rem; color: var(--ink); text-decoration: none; transition: background .2s; }
.chapter-cards a:hover { background: var(--bg-2); }
.cc-n { font: 500 0.72rem/1 var(--font-mono); color: var(--accent-2); letter-spacing: 0.12em; text-transform: uppercase; }
.cc-t { font-family: var(--font-display); font-size: 1.75rem; line-height: 1.1; margin: 0.5rem 0 0.5rem; }
.cc-d { color: var(--muted); font-size: 0.95rem; line-height: 1.5; margin: 0; flex: 1; }
.cc-q { font: 400 0.78rem/1.4 var(--font-mono); color: var(--accent); margin-top: 1rem; }
.thesis { display: grid; grid-template-columns: 1fr; gap: 2rem; }
@media (min-width: 900px) { .thesis { grid-template-columns: 1.1fr 1fr; gap: 4rem; align-items: start; } }
.constraint-list { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--rule); }
.constraint-list li { display: grid; grid-template-columns: 9rem 1fr; gap: 1rem; padding: 0.9rem 0; border-bottom: 1px solid var(--rule); font-size: 0.98rem; }
.constraint-list b { font-family: var(--font-mono); font-weight: 500; font-size: 0.8rem; color: var(--accent-2); text-transform: uppercase; letter-spacing: 0.06em; padding-top: 3px; }
@media (max-width: 520px) { .constraint-list li { grid-template-columns: 1fr; gap: 0.2rem; } }
.promise { font-family: var(--font-display); font-size: clamp(1.7rem, 4vw, 2.6rem); line-height: 1.2; max-width: 30ch; color: var(--ink); }
.promise em { color: var(--accent-2); }

/* ---------- glossary / sources ---------- */
.glossary-list dt { font-family: var(--font-display); font-size: 1.45rem; margin-top: 1.6rem; scroll-margin-top: 80px; }
.glossary-list dd { margin: 0.2rem 0 0; }
.glossary-list dd .see { font-size: 0.85rem; }
.glossary-list dt:target { color: var(--accent-2); }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--rule); background: var(--bg-2); margin-top: 0; padding: 3rem var(--gutter) 2rem; font-size: 0.9rem; }
.footer-inner { max-width: var(--wide); margin: 0 auto; display: grid; gap: 2rem; grid-template-columns: 1fr; }
@media (min-width: 760px) { .footer-inner { grid-template-columns: 1.4fr 1fr 1fr 0.8fr; } }
.footer-title { font-family: var(--font-display); font-size: 1.5rem; line-height: 1.1; margin: 0 0 0.5rem; }
.footer-title em { color: var(--accent-2); }
.footer-motto { font-family: var(--font-display); font-style: italic; font-size: 1.1rem; color: var(--ink-2); margin: 0 0 0.6rem; }
.footer-tag { color: var(--muted); margin: 0; max-width: 26rem; }
.footer-h { font: 500 0.7rem/1 var(--font-mono); text-transform: uppercase; letter-spacing: 0.14em; color: var(--muted); margin: 0 0 0.8rem; }
.site-footer ol, .site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin: 0 0 0.45rem; }
.site-footer a { color: var(--ink-2); text-decoration: none; }
.site-footer a:hover { color: var(--accent); text-decoration: underline; }
.footer-licence { max-width: var(--wide); margin: 2.4rem auto 0; color: var(--muted); font-size: 0.8rem; border-top: 1px solid var(--rule); padding-top: 1.2rem; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}
@media print {
  .site-header, .site-footer, .w-deck, .w-toolbar, .toc, .chapter-hero { display: none !important; }
  body { background: #fff; color: #000; }
}

/* hero sky widget */
.hero-globe { position: absolute; right: clamp(12px, 3vw, 40px); top: clamp(12px, 3vw, 36px); width: clamp(120px, 17vw, 210px); z-index: 3; cursor: grab; border-radius: 50%; }
.hero-globe .w-stage { min-height: 0; }
.hero-globe:active { cursor: grabbing; }
.hero-ctl { position: absolute; right: clamp(12px, 3vw, 40px); bottom: clamp(16px, 4vw, 48px); z-index: 3; width: min(19rem, calc(100% - 32px)); background: rgba(5, 15, 24, 0.72); border: 1px solid rgba(124,219,223,.2); border-radius: 10px; padding: 10px 14px 6px; backdrop-filter: blur(6px); }
.hero-ctl .w-ctl { min-width: 0; }
.hero-place { margin: 4px 0 4px; font: 400 0.72rem/1.3 var(--font-mono); color: var(--fig-muted); }
@media (max-width: 760px) {
  .home-hero { min-height: 100svh; align-items: start; }
  .hero-copy { padding-top: 46svh; }
  .hero-ctl { bottom: auto; top: 12px; left: 12px; right: auto; width: min(13.5rem, calc(100vw - 150px)); padding: 8px 10px 4px; }
  .hero-place { display: none; }
  .hero-globe { width: 104px; }
}