/* =====================================================================
   Vantasner Hydride–Piezo: base design system
   Brand source: vantasner.io (Wix theme + logo files)
   - near-black ground #191919, white type
   - display: Arial family, very tight tracking, huge sizes
   - UI + labels: Azeret Mono, bracketed [LABELS]
   - four-stripe palette: amber, orange, crimson, purple
   Shared by every page. Page-specific styles live in styles/pages/*.css
   ===================================================================== */

:root {
  /* brand */
  --amber: #ffb200;
  --orange: #eb5b00;
  --crimson: #d91656;
  --purple: #640d5f;
  /* tints for text on dark (brand fills are too dark to read as text) */
  --amber-ink: #ffc23d;
  --orange-ink: #ff7a2e;
  --crimson-ink: #ff4d83;
  --purple-ink: #d58be0;
  /* text on brand fills: white fails contrast on amber (1.8:1) and on orange for small text (3.5:1) */
  --on-amber: #121212;
  --on-orange: #121212;

  /* ground + ink */
  --bg: #191919;
  --bg-deep: #121212;
  --bg-raise: #202020;
  --bg-raise-2: #2a2a2a;
  --ink: #ffffff;
  --ink-2: #c2c2c2;
  --ink-3: #8e8e8e;
  --line: rgba(255, 255, 255, 0.12);
  --line-2: rgba(255, 255, 255, 0.24);

  /* paper (light cards, as on vantasner.io) */
  --paper: #e6e6e6;
  --paper-2: #f4f4f4;
  --paper-ink: #121212;
  --paper-ink-2: #4b4b4b;
  --paper-line: rgba(0, 0, 0, 0.14);

  --stripes: linear-gradient(90deg, var(--amber) 0 25%, var(--orange) 25% 50%, var(--crimson) 50% 75%, var(--purple) 75% 100%);
  --stripes-v: linear-gradient(180deg, var(--amber) 0 25%, var(--orange) 25% 50%, var(--crimson) 50% 75%, var(--purple) 75% 100%);
  --glow: radial-gradient(60% 60% at 70% 40%, rgba(235, 91, 0, 0.35), rgba(100, 13, 95, 0.25) 45%, transparent 75%);

  /* type */
  --font-display: Arial, "Helvetica Neue", Helvetica, "Liberation Sans", sans-serif;
  --font-text: Arial, "Helvetica Neue", Helvetica, "Liberation Sans", sans-serif;
  --font-mono: "Azeret Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --track-display: -0.055em;
  --track-head: -0.04em;

  --fs-display-0: clamp(64px, 14.5vw, 232px);
  --fs-display-1: clamp(52px, 9vw, 152px);
  --fs-display-2: clamp(42px, 6.4vw, 104px);
  --fs-h2: clamp(34px, 4.6vw, 72px);
  --fs-h3: clamp(24px, 2.4vw, 36px);
  --fs-h4: clamp(19px, 1.5vw, 23px);
  --fs-lead: clamp(19px, 1.65vw, 25px);
  --fs-body: 17px;
  --fs-mono: 14px;
  --fs-small: 12.5px;

  /* layout */
  --container: 1360px;
  --container-narrow: 860px;
  --gutter: clamp(16px, 4vw, 56px);
  --header-h: 60px;
  --radius: 6px;
  --radius-lg: 14px;
  --section-pad: clamp(72px, 11vw, 168px);

  --ease: cubic-bezier(0.2, 0.7, 0.1, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  color-scheme: dark;
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 24px); }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 var(--fs-body)/1.6 var(--font-text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}
img, svg, video, canvas { display: block; max-width: 100%; }
img { height: auto; }
h1, h2, h3, h4, h5, h6, p, ul, ol, figure, blockquote, dl { margin: 0; }
:where(ul[class], ol[class]) { list-style: none; padding: 0; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
:focus-visible { outline: 2px solid var(--amber); outline-offset: 3px; border-radius: 2px; }
::selection { background: var(--orange); color: #fff; }
code, kbd, samp { font-family: var(--font-mono); font-size: 0.86em; }
hr { border: 0; border-top: 1px solid var(--line); margin: 48px 0; }

.skip-link { position: absolute; left: 12px; top: -60px; z-index: 1000; background: var(--amber); color: #000; padding: 10px 14px; font: 600 13px var(--font-mono); }
.skip-link:focus { top: 12px; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- layout ---------- */
.container { width: 100%; max-width: calc(var(--container) + var(--gutter) * 2); margin-inline: auto; padding-inline: var(--gutter); }
.container--narrow { max-width: calc(var(--container-narrow) + var(--gutter) * 2); }
.section { padding-block: var(--section-pad); }
.section--tight { padding-block: clamp(48px, 7vw, 96px); }
.band { position: relative; isolation: isolate; }
.band--deep { background: var(--bg-deep); }
.band--raise { background: var(--bg-raise); }
.band--paper { background: var(--paper); color: var(--paper-ink); }
.band--amber { background: var(--amber); color: var(--paper-ink); }
.band--purple { background: var(--purple); }
main { display: block; min-height: 60vh; }

/* ---------- type ---------- */
.display-0, .display-1, .display-2, .h2, .h3 { font-family: var(--font-display); font-weight: 400; color: inherit; }
.display-0 { font-size: var(--fs-display-0); line-height: 0.86; letter-spacing: var(--track-display); }
.display-1 { font-size: var(--fs-display-1); line-height: 0.88; letter-spacing: var(--track-display); }
.display-2 { font-size: var(--fs-display-2); line-height: 0.92; letter-spacing: var(--track-head); }
.h2 { font-size: var(--fs-h2); line-height: 0.96; letter-spacing: var(--track-head); }
.h3 { font-size: var(--fs-h3); line-height: 1.08; letter-spacing: -0.03em; }
.h4 { font: 700 var(--fs-h4)/1.25 var(--font-display); letter-spacing: -0.015em; }
.lead { font: 400 var(--fs-lead)/1.38 var(--font-text); color: var(--ink-2); max-width: 46ch; letter-spacing: -0.012em; }
.lead strong { color: var(--ink); font-weight: 400; }
:is(.display-0, .display-1, .display-2, .h2) + .lead { margin-top: clamp(24px, 3vw, 44px); }
.mono { font-family: var(--font-mono); font-size: var(--fs-mono); line-height: 1.6; }
.small { font-size: var(--fs-small); }
.muted { color: var(--ink-3); }
.hl-amber { color: var(--amber); }
.hl-orange { color: var(--orange-ink); }
.hl-crimson { color: var(--crimson-ink); }
.hl-purple { color: var(--purple-ink); }
.bold { font-weight: 700; }
.balance { text-wrap: balance; }
.pretty { text-wrap: pretty; }

.kicker { font: 500 13px/1.4 var(--font-mono); letter-spacing: 0.02em; color: var(--amber); text-transform: uppercase; margin-bottom: 20px; }
.kicker--orange { color: var(--orange-ink); }
.kicker--crimson { color: var(--crimson-ink); }
.kicker--purple { color: var(--purple-ink); }
.kicker--ink { color: var(--ink-2); }
.band--paper .kicker, .band--amber .kicker { color: var(--purple); }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  backdrop-filter: blur(14px) saturate(1.2);
}
.site-header__bar { display: flex; align-items: center; gap: 24px; height: var(--header-h); padding-inline: clamp(14px, 2vw, 28px); }
.site-header__brand { display: flex; align-items: center; gap: 12px; text-decoration: none; flex: none; }
.site-header__brand img { width: 118px; height: auto; }
.site-header__program { font: 500 12px/1 var(--font-mono); color: var(--amber); padding: 5px 7px; border: 1px solid color-mix(in srgb, var(--amber) 45%, transparent); border-radius: 3px; white-space: nowrap; }
.site-nav { margin-inline: auto; }
.site-nav ul { display: flex; gap: clamp(6px, 1.1vw, 18px); list-style: none; margin: 0; padding: 0; }
.site-nav a { font: 400 12.5px/1 var(--font-mono); text-decoration: none; color: var(--ink-2); padding: 8px 2px; white-space: nowrap; transition: color 0.2s; }
.site-nav a:hover { color: var(--ink); }
.site-nav a[aria-current="page"] { color: var(--amber); }
.site-header__tools { display: flex; align-items: center; gap: 14px; flex: none; }
.tool-btn { font: 400 12.5px/1 var(--font-mono); color: var(--ink-2); text-decoration: none; white-space: nowrap; padding: 8px 2px; }
.tool-btn:hover { color: var(--ink); }
.tool-btn--accent { color: var(--amber); }
.tool-btn kbd { font-size: 11px; padding: 1px 5px; border: 1px solid var(--line-2); border-radius: 3px; margin-left: 2px; }
.nav-toggle { display: none; color: var(--ink); padding: 8px; }

.mobile-nav { position: fixed; inset: calc(var(--header-h) + 3px) 0 0 0; background: var(--bg); z-index: 99; padding: 24px var(--gutter); overflow-y: auto; }
.mobile-nav[hidden] { display: none; }
.mobile-nav ul { list-style: none; padding: 0; margin: 0; }
.mobile-nav a { display: flex; align-items: baseline; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--line); font: 400 clamp(30px, 9vw, 44px)/1 var(--font-display); letter-spacing: var(--track-head); text-decoration: none; }
.mobile-nav a[aria-current="page"] { color: var(--amber); }
.mobile-nav__n { font: 400 12px var(--font-mono); color: var(--ink-3); letter-spacing: 0; width: 22px; }

@media (max-width: 1180px) {
  .site-nav, .site-header__tools .tool-btn--accent { display: none; }
  .nav-toggle { display: block; }
  .site-header__tools { margin-left: auto; }
}
@media (max-width: 480px) {
  .site-header__program { display: none; }
}

/* ---------- depth gauge: the brand stripes light up as you go deeper ---------- */
.depth { display: grid; grid-template-columns: repeat(4, 1fr); height: 3px; position: relative; }
.depth__seg { position: relative; opacity: 0.16; transition: opacity 0.4s var(--ease), height 0.2s; }
.depth__seg--amber { background: var(--amber); }
.depth__seg--orange { background: var(--orange); }
.depth__seg--crimson { background: var(--crimson); }
.depth__seg--purple { background: var(--purple); }
.depth__seg.is-lit { opacity: 1; }
.depth__label { position: absolute; top: 7px; left: 10px; font: 500 10.5px/1 var(--font-mono); letter-spacing: 0.04em; color: var(--ink-2); background: var(--bg-deep); padding: 5px 7px; border-radius: 3px; box-shadow: 0 6px 18px rgba(0, 0, 0, 0.5); opacity: 0; transform: translateY(-3px); transition: opacity 0.25s, transform 0.25s; pointer-events: none; white-space: nowrap; }
.depth:hover .depth__label { opacity: 1; transform: none; }
.depth__seg.is-here .depth__label { color: var(--ink); }

.crumbs { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 24px; font: 400 12.5px/1.4 var(--font-mono); color: var(--ink-3); margin-bottom: 36px; }
.crumbs ol { display: flex; flex-wrap: wrap; gap: 4px; list-style: none; padding: 0; margin: 0; }
.crumbs li:not(:last-child)::after { content: "/"; margin-left: 6px; color: var(--ink-3); opacity: 0.6; }
.crumbs a { text-decoration: none; color: var(--ink-2); }
.crumbs a:hover { color: var(--amber); }
.crumbs [aria-current] { color: var(--ink); }
.crumbs__depth--amber { color: var(--amber); }
.crumbs__depth--orange { color: var(--orange-ink); }
.crumbs__depth--crimson { color: var(--crimson-ink); }
.crumbs__depth--purple { color: var(--purple-ink); }

/* ---------- chapter hero (depth-1 pages) ---------- */
.chapter-hero { padding-block: clamp(72px, 12vw, 180px) clamp(48px, 7vw, 96px); position: relative; }
.chapter-hero .lead { margin-top: clamp(24px, 3vw, 40px); }

/* ---------- stripes ---------- */
.stripes { display: grid; grid-template-columns: repeat(4, 1fr); height: 10px; }
.stripes i:nth-child(1) { background: var(--amber); }
.stripes i:nth-child(2) { background: var(--orange); }
.stripes i:nth-child(3) { background: var(--crimson); }
.stripes i:nth-child(4) { background: var(--purple); }
.stripes--v { grid-template-columns: none; grid-template-rows: repeat(4, 1fr); width: 10px; height: auto; }

/* ---------- buttons, chips, deeper links ---------- */
.btn { display: inline-flex; align-items: center; gap: 10px; font: 500 14px/1 var(--font-mono); text-decoration: none; padding: 15px 20px; border: 1px solid var(--line-2); border-radius: 3px; color: var(--ink); transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.2s var(--ease); }
.btn:hover { border-color: var(--ink); }
.btn--solid { background: var(--amber); border-color: var(--amber); color: #121212; }
.btn--solid:hover { background: var(--orange); border-color: var(--orange); color: #fff; }
.btn__arrow { transition: transform 0.25s var(--ease); }
.btn:hover .btn__arrow { transform: translateX(4px); }
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; }

.chip { display: inline-flex; align-items: center; gap: 6px; font: 400 12px/1.2 var(--font-mono); color: var(--ink-2); text-decoration: none; padding: 5px 9px 5px 7px; border: 1px solid var(--line); border-radius: 999px; white-space: nowrap; transition: color 0.2s, border-color 0.2s, background 0.2s; vertical-align: middle; }
.chip:hover { color: var(--ink); border-color: var(--amber); background: color-mix(in srgb, var(--amber) 10%, transparent); }
.chip__arrow { color: var(--amber); }
.band--paper .chip, .band--amber .chip { color: var(--paper-ink-2); border-color: var(--paper-line); }
.band--paper .chip__arrow, .band--amber .chip__arrow { color: var(--purple); }
.card-paper .chip { color: var(--paper-ink-2); border-color: var(--paper-line); }
.card-paper .chip__arrow { color: var(--purple); }
.card-paper .est { color: var(--paper-ink-2); border-color: var(--paper-line); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }

.deeper { --c: var(--orange); display: grid; grid-template-columns: auto 1fr auto; align-items: baseline; gap: 4px 18px; padding: 22px 0; border-top: 1px solid var(--line); text-decoration: none; transition: border-color 0.25s; }
.deeper:hover { border-top-color: var(--c); }
.deeper--d1 { --c: var(--orange); }
.deeper--d2 { --c: var(--crimson); }
.deeper--d3 { --c: var(--purple-ink); }
.deeper__level { font: 500 12px/1 var(--font-mono); color: var(--c); }
.deeper__label { font: 400 clamp(20px, 2vw, 28px)/1.15 var(--font-display); letter-spacing: -0.025em; }
.deeper__note { grid-column: 2; font: 400 13px/1.5 var(--font-mono); color: var(--ink-3); }
.deeper__arrow { grid-row: 1; grid-column: 3; font: 400 24px/1 var(--font-display); color: var(--c); transition: transform 0.25s var(--ease); }
.deeper:hover .deeper__arrow { transform: translateX(6px); }
.deeper-list { display: grid; }
.deeper-list .deeper:last-child { border-bottom: 1px solid var(--line); }

.est { display: inline-block; font: 500 10.5px/1 var(--font-mono); letter-spacing: 0.03em; color: var(--ink-3); border: 1px solid var(--line-2); border-radius: 3px; padding: 3px 4px 2px; vertical-align: 0.18em; margin-left: 3px; text-transform: lowercase; white-space: nowrap; }
.band--paper .est, .band--amber .est { color: var(--paper-ink-2); border-color: var(--paper-line); }

/* ---------- glossary terms ---------- */
.term { border-bottom: 1px dotted color-mix(in srgb, var(--amber) 70%, transparent); cursor: help; }
.term:hover, .term:focus { border-bottom-style: solid; outline: none; }
.term-tip { position: fixed; z-index: 400; max-width: 320px; padding: 12px 14px; background: var(--paper-2); color: var(--paper-ink); font: 400 13px/1.5 var(--font-mono); border-radius: 4px; box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45); pointer-events: none; opacity: 0; transform: translateY(4px); transition: opacity 0.15s, transform 0.15s; }
.term-tip.is-on { opacity: 1; transform: none; }
.term-tip b { display: block; font: 700 14px/1.3 var(--font-display); color: var(--purple); margin-bottom: 4px; letter-spacing: -0.01em; }

/* ---------- stat bars (vantasner.io signature) ---------- */
.statbars { display: grid; gap: 0; }
.statbar { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: center; gap: 24px; width: var(--w, 100%); min-height: clamp(84px, 9vw, 124px); padding: 10px clamp(14px, 1.5vw, 22px); color: #fff; text-decoration: none; overflow: hidden; transform-origin: left center; }
.statbar--amber { background: var(--amber); color: #121212; }
.statbar--orange { background: var(--orange); }
.statbar--crimson { background: var(--crimson); }
.statbar--purple { background: var(--purple); }
.statbar__value { font: 400 clamp(48px, 7.4vw, 110px)/0.9 var(--font-display); letter-spacing: var(--track-display); white-space: nowrap; }
.statbar__label { font: 400 clamp(17px, 2.2vw, 36px)/1.02 var(--font-display); letter-spacing: -0.035em; }
a.statbar:hover .statbar__label { text-decoration: underline; text-decoration-thickness: 2px; }
.js .statbars[data-reveal] .statbar { transform: scaleX(0.02); transition: transform 1.1s var(--ease-out); }
.js .statbars[data-reveal] .statbar > * { opacity: 0; transition: opacity 0.6s 0.5s; }
.js .statbars[data-reveal].is-in .statbar { transform: none; }
.js .statbars[data-reveal].is-in .statbar > * { opacity: 1; }
.statbars.is-in .statbar:nth-child(2) { transition-delay: 0.12s; }
.statbars.is-in .statbar:nth-child(3) { transition-delay: 0.24s; }
.statbars.is-in .statbar:nth-child(4) { transition-delay: 0.36s; }
@media (max-width: 720px) {
  .statbar { grid-template-columns: 1fr; gap: 6px; width: max(var(--w, 100%), 78%); padding-block: 16px; }
}

/* ---------- paper card (vantasner ecosystem card) ---------- */
.card-paper { background: var(--paper); color: var(--paper-ink); border-radius: var(--radius); overflow: hidden; }
.card-paper__title { font: 400 clamp(22px, 2vw, 30px)/1.05 var(--font-display); color: var(--purple); letter-spacing: -0.03em; }
.card-paper__sub { font: 700 13.5px/1.45 var(--font-mono); margin-top: 8px; }
.card-paper__body { font: 400 13.5px/1.6 var(--font-mono); color: var(--paper-ink-2); }

/* ---------- prose (long-form documents) ---------- */
.prose { font: 400 17px/1.68 var(--font-text); color: var(--ink-2); max-width: 74ch; overflow-wrap: break-word; }
.prose > * + * { margin-top: 1.05em; }
.prose h1 { font: 400 var(--fs-display-2)/0.95 var(--font-display); letter-spacing: var(--track-head); color: var(--ink); margin-bottom: 0.4em; }
.prose h2 { font: 400 var(--fs-h2)/1 var(--font-display); letter-spacing: var(--track-head); color: var(--ink); margin-top: 2.2em; margin-bottom: 0.2em; }
.prose h3 { font: 400 var(--fs-h3)/1.12 var(--font-display); letter-spacing: -0.03em; color: var(--ink); margin-top: 1.9em; }
.prose h4 { font: 700 18px/1.3 var(--font-display); color: var(--ink); margin-top: 1.6em; }
.prose strong { color: var(--ink); font-weight: 700; }
.prose a { color: var(--ink); text-decoration-color: var(--orange); }
.prose a:hover { color: var(--amber); }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li + li { margin-top: 0.45em; }
.prose li::marker { color: var(--orange); }
.prose code { color: var(--amber-ink); background: rgba(255, 178, 0, 0.08); padding: 0.1em 0.35em; border-radius: 3px; }
.prose blockquote { border-left: 3px solid var(--amber); padding-left: 1em; color: var(--ink); }
.prose .table-wrap { max-width: none; }

/* doc mentions + external links (generated by the build) */
a.doclink { text-decoration-style: dotted; text-decoration-color: var(--amber); }
a.doclink:hover { color: var(--amber); }
a.ext::after { content: "↗"; font-size: 0.78em; margin-left: 0.15em; color: var(--ink-3); text-decoration: none; display: inline-block; }
a.doi, a.arxiv { font-family: var(--font-mono); font-size: 0.86em; overflow-wrap: anywhere; }

/* ---------- tables ---------- */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg-deep); margin-block: 1.4em; scrollbar-color: var(--bg-raise-2) transparent; }
.table-wrap table { border-collapse: collapse; width: 100%; font: 400 13.5px/1.55 var(--font-text); color: var(--ink-2); }
.table-wrap th { text-align: left; font: 500 11.5px/1.35 var(--font-mono); letter-spacing: 0.03em; text-transform: uppercase; color: var(--amber); padding: 12px 14px; border-bottom: 1px solid var(--line-2); background: var(--bg-raise); vertical-align: bottom; white-space: nowrap; }
.table-wrap td { padding: 12px 14px; border-bottom: 1px solid var(--line); vertical-align: top; min-width: 120px; }
.table-wrap td:first-child { color: var(--ink); min-width: 140px; }
.table-wrap tr:last-child td { border-bottom: 0; }
.table-wrap tr:hover td { background: rgba(255, 255, 255, 0.025); }
.table-wrap td strong { color: var(--ink); }

/* ---------- reveal on scroll ---------- */
.js [data-reveal]:not(.statbars) { opacity: 0; transform: translateY(28px); transition: opacity 0.9s var(--ease-out), transform 0.9s var(--ease-out); transition-delay: var(--delay, 0s); }
.js [data-reveal].is-in:not(.statbars) { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .js [data-reveal]:not(.statbars), .js .statbars[data-reveal] .statbar, .js .statbars[data-reveal] .statbar > * { opacity: 1 !important; transform: none !important; transition: none !important; }
}

/* ---------- footer ---------- */
.site-footer { background: var(--bg-deep); border-top: 1px solid var(--line); padding-block: clamp(72px, 9vw, 128px) 32px; margin-top: 0; }
.site-footer__close { font: 400 clamp(34px, 5.4vw, 88px)/0.98 var(--font-display); letter-spacing: var(--track-head); max-width: 16ch; margin-bottom: clamp(56px, 7vw, 104px); }
.site-footer__grid { display: grid; grid-template-columns: 1fr 1fr 1.6fr; gap: 40px; padding-bottom: 56px; border-bottom: 1px solid var(--line); }
.site-footer__links { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.site-footer__links a { font: 400 14px/1.4 var(--font-mono); color: var(--ink-2); text-decoration: none; }
.site-footer__links a:hover { color: var(--amber); }
.site-footer__note { font: 400 13px/1.65 var(--font-mono); color: var(--ink-3); max-width: 56ch; }
.site-footer__note + .site-footer__note { margin-top: 12px; }
.site-footer__note a { color: var(--ink-2); }
.site-footer__base { display: flex; flex-wrap: wrap; align-items: center; gap: 16px 28px; padding-top: 28px; font: 400 12px/1.4 var(--font-mono); color: var(--ink-3); }
.site-footer__base img { width: 110px; }
.site-footer__base a { margin-left: auto; color: var(--ink-2); text-decoration: none; }
@media (max-width: 860px) {
  .site-footer__grid { grid-template-columns: 1fr; }
  .site-footer__base a { margin-left: 0; }
}

/* ---------- images with brand treatment ---------- */
.media { position: relative; overflow: hidden; background: var(--bg-deep); }
.media img { width: 100%; height: 100%; object-fit: cover; }
.media--fade::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 40%, var(--bg) 100%); pointer-events: none; }

/* ---------- mini depth gauge (crumbs, deeper links, legend) ---------- */
.gauge { display: inline-grid; grid-template-columns: repeat(4, 7px); gap: 2px; margin-right: 8px; vertical-align: 0.05em; }
.gauge i { display: block; height: 7px; opacity: 0.22; }
.gauge i:nth-child(1) { background: var(--amber); }
.gauge i:nth-child(2) { background: var(--orange); }
.gauge i:nth-child(3) { background: var(--crimson); }
.gauge i:nth-child(4) { background: var(--purple-ink); }
.gauge--d0 i:nth-child(-n + 1), .gauge--d1 i:nth-child(-n + 2), .gauge--d2 i:nth-child(-n + 3), .gauge--d3 i { opacity: 1; }
.depth-legend { display: flex; align-items: baseline; gap: 2px; font: 400 12.5px/1.6 var(--font-mono); color: var(--ink-3); max-width: 60ch; margin: 0 0 12px; }
.depth-legend b { font-weight: 500; }
.site-footer .depth-legend .gauge i { opacity: 1; }
.crumbs__depth { white-space: nowrap; }

/* ---------- illustrative-image tag (on every generated photograph) ---------- */
.illus-tag { position: absolute; left: 12px; bottom: 12px; z-index: 3; font: 500 10.5px/1 var(--font-mono); letter-spacing: 0.04em; color: var(--ink-2); background: rgba(10, 10, 10, 0.72); padding: 6px 8px; border-radius: 3px; pointer-events: none; -webkit-backdrop-filter: blur(4px); backdrop-filter: blur(4px); }
.illus-tag--static { position: static; display: inline-block; }

/* ---------- ink on brand fills ---------- */
.on-amber { color: var(--on-amber) !important; }
.on-orange { color: var(--on-orange) !important; }