/* dmart website — one stylesheet for the generated site.
 *
 * Ported from the Svelte site that served dmart.cc (app.css, App.svelte,
 * Home.svelte, AuroraBackground.svelte and the docs pages), adapted to the
 * fixed HTML the generator emits: layout.html wraps every page, docs pages
 * are plain markdown inside <article class="prose">, and the landing page is
 * built from a small set of section kinds (cards, steps, figures, prose,
 * banner).
 *
 * Theme: the `dark` class on <html> (set by site.js before first paint from
 * localStorage or the OS setting). site.js also sets `light` when the choice
 * is light, so the prefers-color-scheme block below only applies when no
 * script has run at all.
 *
 * Contents
 *   1. Tokens (light, dark)          7. Footer
 *   2. Base                          8. Prose (docs + standalone pages)
 *   3. Aurora background             9. Landing: hero, buttons, stats
 *   4. Header                       10. Landing: bands, cards, figures,
 *   5. Page layouts                      steps, banner
 *   6. Docs sidebar + drawer        11. Responsive
 */

/* ── 1. Tokens ─────────────────────────────────────────────────────────── */

:root {
  /* One deliberate violet. The iri-* ramp is a tight range of the same hue. */
  --primary-color: #4f46e5;
  --primary-hover: #4338ca;
  --secondary-color: #5d6478;

  /* Neutrals biased toward the brand hue rather than pure grey. */
  --bg-color: #ffffff;
  --bg-secondary: #f6f7fb;
  --text-main: #15161f;
  --text-secondary: #5d6478;
  --border-color: #e3e5ee;

  --code-bg: #f3f4f9;
  --accent-light: #eef0fe;

  /* Signal: reserved for MEASURED values and nothing else. */
  --signal: #8a5200;
  --signal-soft: #fbf1e2;

  --iri-1: #6366f1;
  --iri-2: #7c5cf5;
  --iri-3: #9b6bf0;
  --iri-4: #5b7cf8;
  --iri-5: #c9bdfb;

  --gradient-iri: linear-gradient(120deg, var(--iri-1) 0%, var(--iri-3) 100%);
  --gradient-iri-soft: linear-gradient(120deg, #f2f1fe 0%, #f7f5ff 100%);
  --gradient-iri-v: linear-gradient(180deg, var(--iri-1), var(--iri-3), var(--iri-4));
  --gradient-iri-h: linear-gradient(90deg, var(--iri-1), var(--iri-3), var(--iri-4));
  --gradient-hairline: linear-gradient(90deg, transparent, var(--border-color) 50%, transparent);
  --gradient-hairline-v: linear-gradient(180deg, transparent, var(--border-color) 50%, transparent);

  /* Surfaces are opaque; no blur-behind. */
  --glass-bg: #ffffff;
  --glass-border: #e3e5ee;

  --radius-sm: 3px;
  --radius-md: 5px;
  --radius-lg: 10px;
  --radius-card: 14px;

  --nav-h: 64px;

  --shadow-sm: 0 1px 2px rgba(21, 22, 31, 0.05);
  --shadow-md: 0 1px 2px rgba(21, 22, 31, 0.05), 0 4px 14px rgba(21, 22, 31, 0.06);
  --shadow-lg: 0 2px 4px rgba(21, 22, 31, 0.05), 0 12px 32px rgba(21, 22, 31, 0.09);

  --header-bg: rgba(255, 255, 255, 0.72);
  --header-shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --scrim: rgba(0, 0, 0, 0.45);

  /* Aurora wash strength, per blob. */
  --aurora-1: 22%;
  --aurora-2: 16%;
  --aurora-3: 22%;

  /* Which glyph the theme toggle shows: the mode you would switch TO. */
  --theme-moon: inline;
  --theme-sun: none;

  /* Archivo for display, IBM Plex Sans for reading, IBM Plex Mono for
     anything numeric or literal. */
  --font-display: 'Archivo', 'Helvetica Neue', Arial, sans-serif;
  --font-sans: 'IBM Plex Sans', system-ui, -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  font-family: var(--font-sans);
  font-feature-settings: "ss01", "cv11";
  line-height: 1.6;
  font-weight: 400;

  color-scheme: light;
  color: var(--text-main);
  background-color: var(--bg-color);

  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

:root.dark {
  --primary-color: #9d94ff;
  --primary-hover: #b8b1ff;
  --secondary-color: #9096ad;

  --bg-color: #0d0e15;
  --bg-secondary: #14161f;
  --text-main: #e7e9f2;
  --text-secondary: #9096ad;
  --border-color: #262a39;

  --code-bg: #171a25;
  --accent-light: #1b1a3a;
  --signal: #d59a4a;
  --signal-soft: #2a2114;

  --iri-1: #8b8cf8;
  --iri-2: #9d94ff;
  --iri-3: #b08bf5;
  --iri-4: #7f9bff;
  --iri-5: #cdc4fb;
  --gradient-iri-soft: linear-gradient(120deg, #17172b 0%, #1b1a32 100%);
  --glass-bg: #14161f;
  --glass-border: #262a39;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2), 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.2), 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 4px 8px rgba(0, 0, 0, 0.2), 0 8px 24px rgba(0, 0, 0, 0.4);

  --header-bg: rgba(15, 15, 26, 0.85);
  --header-shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
  --scrim: rgba(0, 0, 0, 0.6);

  --aurora-1: 28%;
  --aurora-2: 22%;
  --aurora-3: 18%;

  --theme-moon: none;
  --theme-sun: inline;

  color-scheme: dark;
}

/* Scripts disabled: follow the OS. Identical to the block above. */
@media (prefers-color-scheme: dark) {
  :root:not(.light):not(.dark) {
    --primary-color: #9d94ff;
    --primary-hover: #b8b1ff;
    --secondary-color: #9096ad;

    --bg-color: #0d0e15;
    --bg-secondary: #14161f;
    --text-main: #e7e9f2;
    --text-secondary: #9096ad;
    --border-color: #262a39;

    --code-bg: #171a25;
    --accent-light: #1b1a3a;
    --signal: #d59a4a;
    --signal-soft: #2a2114;

    --iri-1: #8b8cf8;
    --iri-2: #9d94ff;
    --iri-3: #b08bf5;
    --iri-4: #7f9bff;
    --iri-5: #cdc4fb;
    --gradient-iri-soft: linear-gradient(120deg, #17172b 0%, #1b1a32 100%);
    --glass-bg: #14161f;
    --glass-border: #262a39;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2), 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.2), 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 4px 8px rgba(0, 0, 0, 0.2), 0 8px 24px rgba(0, 0, 0, 0.4);

    --header-bg: rgba(15, 15, 26, 0.85);
    --header-shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
    --scrim: rgba(0, 0, 0, 0.6);

    --aurora-1: 28%;
    --aurora-2: 22%;
    --aurora-3: 18%;

    --theme-moon: none;
    --theme-sun: inline;

    color-scheme: dark;
  }
}

/* ── 2. Base ───────────────────────────────────────────────────────────── */

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

html {
  overflow-x: hidden;
}

@supports (overflow: clip) {
  html {
    overflow-x: clip;
  }
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-color);
  color: var(--text-main);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  line-height: 1.15;
  margin-top: 0;
  color: var(--text-main);
  letter-spacing: -0.015em;
  text-wrap: balance;
}

h1 { font-size: 2.6rem; font-weight: 700; margin-bottom: 1.5rem; }
h2 { font-size: 2rem; font-weight: 600; margin-bottom: 1.25rem; }
h3 { font-size: 1.5rem; font-weight: 600; margin-bottom: 1rem; }

p {
  margin-top: 0;
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--primary-hover);
}

button {
  font: inherit;
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

main:focus {
  outline: none;
}

[hidden] {
  display: none !important;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -100px;
  z-index: 1000;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-md);
  background: var(--text-main);
  color: var(--bg-color);
  font-weight: 600;
  font-size: 0.9rem;
}

.skip-link:focus {
  top: 0.75rem;
  color: var(--bg-color);
}

/* Off-screen buffer site.js uses for the execCommand copy fallback. */
.copy-buffer {
  position: fixed;
  top: 0;
  left: -9999px;
  opacity: 0;
}

/* ── 3. Aurora background ──────────────────────────────────────────────────
   Three soft violet washes behind everything, static (no animation), as
   plain gradients on one fixed layer. Each stop mirrors a blurred blob of the
   old component: same centre, same reach, same per-theme strength. */

.aurora {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    radial-gradient(circle 32vw at 17.5% calc(27.5vw - 20%),
      color-mix(in srgb, var(--iri-1) var(--aurora-1), transparent) 0%,
      transparent 100%),
    radial-gradient(circle 35vw at 85% calc(30vw + 10%),
      color-mix(in srgb, var(--iri-3) var(--aurora-2), transparent) 0%,
      transparent 100%),
    radial-gradient(circle 38vw at 42.5% calc(125% - 32.5vw),
      color-mix(in srgb, var(--iri-4) var(--aurora-3), transparent) 0%,
      transparent 100%);
}

/* ── 4. Header ─────────────────────────────────────────────────────────── */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 0.75rem 0;
  background: var(--header-bg);
  box-shadow: var(--header-shadow);
  border-bottom: 1px solid transparent;
  border-image: var(--gradient-hairline) 1;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.brand {
  margin-right: auto;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1.6;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--iri-2);
  transition: filter 0.3s ease;
}

.brand:hover {
  color: var(--iri-2);
  filter: brightness(1.12) saturate(1.1);
}

.header-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.header-link {
  display: inline-block;
  padding: 0.5rem 0.75rem;
  font-size: 0.95rem;
  font-weight: 500;
  line-height: normal;
  color: var(--text-secondary);
  border-bottom: 2px solid transparent;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.header-link:hover,
.header-link[aria-current="page"] {
  color: var(--primary-color);
  border-image: var(--gradient-iri-h) 1;
}

.header-link[aria-current="page"] {
  font-weight: 600;
}

.theme-toggle,
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  margin: 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text-main);
  line-height: normal;
  cursor: pointer;
  transition: border-color 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}

.theme-toggle:hover,
.nav-toggle:hover {
  border-color: var(--primary-color);
  background: var(--accent-light);
}

.nav-toggle:hover {
  color: var(--primary-color);
}

.theme-toggle:active,
.nav-toggle:active {
  transform: translateY(1px);
}

/* The toggle only works with script, so it only appears with script. */
html.js .theme-toggle {
  display: inline-flex;
  margin-left: 0.75rem;
  padding: 0.35rem 0.55rem;
  font-size: 1.15rem;
}

.theme-icon-moon { display: var(--theme-moon); }
.theme-icon-sun { display: var(--theme-sun); }

.nav-toggle {
  padding: 0.4rem 0.7rem;
  font-size: 0.9rem;
  font-weight: 600;
}

.nav-toggle[aria-expanded="true"] {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

/* ── 5. Page layouts ───────────────────────────────────────────────────── */

.layout {
  flex: 1 0 auto;
  width: 100%;
  min-width: 0;
}

.content {
  display: block;
  min-width: 0;
  color: var(--text-main);
}

/* Docs: one opaque panel hanging off the header's hairline, split into a
   sidebar column and the article. */
.page-doc .layout {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  max-width: 1200px;
  margin: 0 auto;
  min-height: 80vh;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-top: none;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.page-doc .content {
  padding: 3rem 2.5rem;
}

/* Standalone pages (Features, Why, 404): the same panel, no sidebar. */
.page-standalone .layout {
  max-width: 960px;
  margin: 0 auto;
  min-height: 80vh;
  padding: 3.5rem 2.5rem;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-top: none;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

/* ── 6. Docs sidebar + drawer ──────────────────────────────────────────── */

.sidebar {
  min-width: 0;
  border-right: 1px solid transparent;
  border-image: var(--gradient-hairline-v) 1;
}

.sidebar-nav {
  position: sticky;
  top: var(--nav-h);
  max-height: calc(100vh - var(--nav-h));
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 2rem 1rem 2.5rem;
}

.nav-group + .nav-group {
  margin-top: 1.5rem;
}

.nav-group-title {
  margin: 0 0 0.35rem 0.8rem;
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1.6;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
}

.nav-links {
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  position: relative;
  display: block;
  padding: 0.45rem 0.8rem;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
}

/* Mirrors the article h1's violet left bar. */
.nav-links a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 3px;
  border-radius: 2px;
  background: var(--gradient-iri-v);
  opacity: 0;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  background: var(--accent-light);
  color: var(--primary-color);
}

.nav-links a[aria-current="page"] {
  font-weight: 600;
}

.nav-links a[aria-current="page"]::before {
  opacity: 1;
}

.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 250;
  background: var(--scrim);
}

@media (prefers-reduced-motion: no-preference) {
  .nav-links a {
    transition: background-color 0.15s ease, color 0.15s ease;
  }
  .nav-links a::before {
    transition: opacity 0.18s ease;
  }
}

/* ── 7. Footer ─────────────────────────────────────────────────────────── */

.site-footer {
  margin-top: auto;
  padding: 1.5rem 1rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-secondary);
  border-top: 1px solid transparent;
  border-image: var(--gradient-hairline) 1;
}

.site-footer p {
  margin: 0;
  line-height: 1.6;
  color: var(--text-secondary);
}

.site-footer p + p {
  margin-top: 0.4rem;
}

.site-footer a {
  color: var(--text-secondary);
}

.site-footer a:hover {
  color: var(--primary-color);
}

/* ── 8. Prose ──────────────────────────────────────────────────────────────
   Generic markdown output, styled the way the hand-written docs pages
   looked. The old pages boxed each h2 section in its own card; markdown has
   no wrapper to hang that on, so sections are separated by a hairline above
   each h2 instead. */

.prose {
  color: var(--text-main);
  overflow-wrap: break-word;
}

.prose > :first-child {
  margin-top: 0;
}

.prose > :last-child {
  margin-bottom: 0;
}

.prose [id] {
  scroll-margin-top: calc(var(--nav-h) + 1rem);
}

.prose h1 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  padding-left: 1rem;
  border-left: 4px solid transparent;
  border-image: var(--gradient-iri-v) 1;
}

/* A paragraph straight after the title is the page's lede. */
.prose > h1 + p {
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 2.5rem;
}

.prose h2 {
  font-size: 1.5rem;
  margin: 3rem 0 1rem;
  padding-top: 2.25rem;
  border-top: 1px solid transparent;
  border-image: var(--gradient-hairline) 1;
}

.prose > h1 + h2,
.prose > h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.prose h3 {
  width: fit-content;
  max-width: 100%;
  font-size: 1.1rem;
  margin: 2rem 0 1rem;
  padding-bottom: 0.2rem;
  letter-spacing: 0.5px;
  border-bottom: 2px solid transparent;
  border-image: var(--gradient-iri-h) 1;
}

.prose h2 + h3 {
  margin-top: 1.25rem;
}

.prose h4 {
  font-size: 0.95rem;
  margin: 1.5rem 0 0.6rem;
  letter-spacing: 0.5px;
}

.prose h5,
.prose h6 {
  font-size: 0.85rem;
  margin: 1.25rem 0 0.5rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.prose h6 {
  color: var(--text-secondary);
}

.prose p {
  margin: 0 0 1rem;
  line-height: 1.6;
}

.prose a {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  text-decoration-color: color-mix(in srgb, currentColor 35%, transparent);
}

.prose a:hover {
  text-decoration-color: currentColor;
}

.prose strong,
.prose b {
  color: var(--text-main);
  font-weight: 700;
}

.prose em,
.prose i {
  font-style: italic;
  font-synthesis: style;
}

.prose ul,
.prose ol {
  margin: 0 0 1rem;
  padding-left: 1.2rem;
}

.prose ul {
  list-style-type: disc;
}

.prose li {
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.prose li::marker {
  color: var(--text-secondary);
}

.prose li > p {
  margin: 0 0 0.5rem;
}

.prose li > :last-child {
  margin-bottom: 0;
}

.prose li > ul,
.prose li > ol {
  margin-top: 0.5rem;
  margin-bottom: 0.5rem;
}

/* GitHub-style task lists. */
.prose .contains-task-list,
.prose ul:has(> li > input[type="checkbox"]) {
  list-style: none;
  padding-left: 0.25rem;
}

.prose .task-list-item input[type="checkbox"],
.prose li > input[type="checkbox"] {
  margin: 0 0.55rem 0 0;
  vertical-align: -0.1em;
  accent-color: var(--iri-2);
}

.prose blockquote {
  margin: 1.5rem 0;
  padding: 0.9rem 1.25rem;
  background: var(--gradient-iri-soft);
  border: 1px solid var(--glass-border);
  border-left: 3px solid var(--iri-2);
  border-radius: var(--radius-md);
}

.prose blockquote p,
.prose blockquote li {
  color: var(--text-main);
}

.prose blockquote > :last-child {
  margin-bottom: 0;
}

.prose hr {
  height: 1px;
  margin: 2.5rem 0;
  border: 0;
  background: var(--gradient-hairline);
}

.prose img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

.prose dl {
  margin: 0 0 1rem;
}

.prose dt {
  font-weight: 600;
  color: var(--text-main);
}

.prose dd {
  margin: 0 0 0.75rem 1.2rem;
  color: var(--text-secondary);
}

.prose kbd {
  font-family: var(--font-mono);
  font-size: 0.8em;
  padding: 0.1rem 0.4rem;
  border: 1px solid var(--border-color);
  border-bottom-width: 2px;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  color: var(--text-main);
}

/* Inline code. */
.prose code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  padding: 0.15rem 0.4rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--code-bg);
  color: var(--text-main);
}

.prose h1 code,
.prose h2 code,
.prose h3 code,
.prose h4 code {
  font-size: 0.8em;
}

/* Code blocks. */
.prose pre {
  margin: 1rem 0 1.5rem;
  padding: 1.25rem;
  overflow-x: auto;
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  -webkit-overflow-scrolling: touch;
}

.prose pre code {
  display: block;
  padding: 0;
  border: none;
  border-radius: 0;
  background: transparent;
  font-size: 0.8rem;
  line-height: 1.6;
  white-space: pre;
  overflow-wrap: normal;
  color: var(--text-main);
  tab-size: 4;
}

/* site.js wraps each block to pin a copy button outside the scroller. */
.code-block {
  position: relative;
  margin: 1rem 0 1.5rem;
}

.code-block > pre {
  margin: 0;
}

.copy-button {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  padding: 0.3rem 0.55rem;
  font-family: var(--font-sans);
  font-size: 0.68rem;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.code-block:hover .copy-button,
.copy-button:focus-visible,
.copy-button.copied {
  opacity: 1;
}

.copy-button:hover,
.copy-button.copied {
  color: var(--primary-color);
  border-color: var(--primary-color);
}

@media (hover: none) {
  .copy-button {
    opacity: 1;
  }
}

/* Tables scroll inside their own wrapper, never the page. */
.table-wrap {
  margin: 1rem 0 1.5rem;
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  -webkit-overflow-scrolling: touch;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.prose thead {
  background: var(--gradient-iri-soft);
}

.prose th {
  padding: 0.75rem 1rem;
  text-align: left;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--text-main);
  border-bottom: 2px solid var(--border-color);
  vertical-align: bottom;
}

.prose td {
  padding: 0.75rem 1rem;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
  vertical-align: top;
  line-height: 1.5;
}

.prose tbody tr:last-child td {
  border-bottom: none;
}

.prose td code,
.prose th code {
  font-size: 0.8em;
  white-space: nowrap;
}

/* Mermaid: the bordered diagram panel of the old pages. Until a diagram has
   rendered its source is hidden so the page does not flash a wall of text;
   if it cannot render (no mermaid, syntax error, scripts off) the source is
   shown instead. */
.prose pre.mermaid,
pre.mermaid {
  margin: 1.5rem 0;
  padding: 1rem;
  overflow-x: auto;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.6;
  white-space: pre;
  color: var(--text-main);
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
}

pre.mermaid.mermaid-source {
  text-align: left;
}

html.js pre.mermaid:not([data-processed]):not(.mermaid-source),
pre.mermaid.mermaid-pending {
  color: transparent;
}

pre.mermaid svg {
  max-width: 100%;
  height: auto;
}

/* 404 */
.prose.not-found {
  padding: 3rem 0;
  text-align: center;
}

.prose.not-found h1 {
  padding-left: 0;
  border-left: none;
  font-size: 3rem;
}

/* ── 9. Landing: hero, buttons, stats ──────────────────────────────────── */

.hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 6rem 2rem 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4rem;
}

.hero-inner {
  flex: 1;
  min-width: 0;
  max-width: 540px;
}

.hero-badge {
  display: inline-block;
  margin: 0 0 1.5rem;
  padding: 0.3rem 1rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--primary-color);
  background: var(--gradient-iri-soft);
  border: 1px solid var(--glass-border);
  border-radius: 100px;
  box-shadow: 0 1px 2px rgba(139, 92, 246, 0.08);
}

.hero-title {
  margin: 0 0 1.5rem;
  font-size: 5rem;
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -3px;
}

.hero-title-line {
  display: block;
}

.hero-title-line.accent,
.band-banner .accent {
  background: var(--gradient-iri);
  background-size: 220% 220%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-subtitle {
  max-width: 420px;
  margin: 0 0 2rem;
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.hero-figure {
  flex-shrink: 0;
  width: 380px;
  max-width: 100%;
}

.hero-figure svg {
  display: block;
  width: 100%;
  height: auto;
}

/* Architecture figure (figures/architecture.svg). One stroke weight, one type
   size, three roles distinguished by fill: clients and store are outlines,
   the engine is the filled object, the index sits between them. */
.hf rect {
  fill: var(--bg-color);
  stroke: var(--border-color);
  stroke-width: 1;
}

.hf .hf-engine > rect {
  fill: var(--accent-light);
  stroke: var(--iri-2);
}

.hf .hf-chip rect {
  fill: var(--bg-color);
  stroke: var(--border-color);
}

.hf .hf-index rect {
  fill: var(--bg-secondary);
}

.hf text {
  font-family: var(--font-mono);
  font-size: 8.5px;
  fill: var(--text-secondary);
  text-anchor: middle;
}

.hf .hf-clients text,
.hf .hf-chip text {
  fill: var(--text-main);
}

.hf .hf-title {
  text-anchor: start;
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 600;
  fill: var(--text-main);
}

.hf .hf-store text:not(.hf-title),
.hf .hf-index text:not(.hf-title) {
  text-anchor: start;
}

.hf .hf-wire path {
  fill: none;
  stroke: var(--border-color);
  stroke-width: 1;
}

.hf .hf-edge {
  font-size: 7.5px;
  fill: var(--text-secondary);
}

/* Action rows (hero, sections, banner). */
.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
}

.btn {
  display: inline-block;
  padding: 0.7rem 1.8rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  line-height: normal;
  letter-spacing: 1px;
  text-align: center;
  border-radius: 6px;
  cursor: pointer;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  color: #fff;
  font-weight: 700;
  border-radius: 8px;
  background: var(--gradient-iri);
  background-size: 160% 160%;
  background-position: 0% 50%;
  box-shadow: 0 4px 14px -4px rgba(139, 92, 246, 0.55);
  transition: background-position 0.4s ease, box-shadow 0.2s ease, transform 0.15s ease;
}

.btn-primary:hover {
  color: #fff;
  background-position: 100% 50%;
  box-shadow: 0 6px 20px -4px rgba(217, 70, 239, 0.55);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  color: var(--primary-color);
  background: transparent;
  border: 1px solid var(--primary-color);
  transition: background-color 0.2s, color 0.2s;
}

.btn-secondary:hover {
  color: #fff;
  background-color: var(--primary-color);
}

.btn-link {
  padding: 0;
  font-size: 0.85rem;
  line-height: 1.6;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-secondary);
  border-radius: 0;
  transition: color 0.2s;
}

.btn-link:hover {
  color: var(--primary-color);
}

.btn-link:active {
  transform: none;
}

/* Stats strip. */
.stats {
  background: var(--gradient-iri-soft);
  border-top: 1px solid transparent;
  border-bottom: 1px solid transparent;
  border-image: var(--gradient-hairline) 1;
}

.stats-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: center;
}

.stat {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  padding: 2.5rem 3rem;
  text-align: center;
}

.stat + .stat::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 1px;
  height: 3rem;
  margin-top: -1.5rem;
  background: var(--gradient-hairline-v);
}

.stat-value {
  font-size: 1.8rem;
  font-weight: 900;
  letter-spacing: -1px;
  white-space: nowrap;
  background: var(--gradient-iri);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.stat-label {
  font-size: 0.7rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-secondary);
}

/* ── 10. Landing: bands ────────────────────────────────────────────────── */

.band {
  max-width: 1200px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

.section-title {
  margin: 0 0 3rem;
  font-size: 1.5rem;
  font-weight: 700;
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--text-main);
}

.section-body {
  max-width: 720px;
  margin: -1.5rem auto 2.5rem;
  text-align: center;
}

.section-body > :last-child {
  margin-bottom: 0;
}

.band > .actions {
  justify-content: center;
  margin-top: 2.5rem;
}

/* Prose band: free text under a section title. */
.band-prose .section-body {
  margin-top: 0;
  text-align: left;
}

/* After the steps, bands are divided by a hairline, as on the old page. */
.band-steps,
.band-steps + .band:not(.band-banner) {
  border-top: 1px solid transparent;
  border-image: var(--gradient-hairline) 1;
}

/* ── Cards ── */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr));
  gap: 1.5rem;
}

/* Column counts by item count, so four tiles sit in one row, not 3 + 1. */
.cards:has(> :nth-child(2):last-child) { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.cards:has(> :nth-child(3):last-child) { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.cards:has(> :nth-child(4):last-child) { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* Linked card: the pillar tile. */
a.card {
  position: relative;
  isolation: isolate;
  display: flex;
  flex-direction: column;
  padding: 2rem;
  color: inherit;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-card);
  transition: box-shadow 0.25s ease, transform 0.25s ease, border-color 0.25s ease;
}

/* Violet ring that fades in on hover. */
a.card::before {
  content: "";
  position: absolute;
  inset: -1px;
  padding: 1px;
  border-radius: inherit;
  background: conic-gradient(from 0deg, var(--iri-1), var(--iri-3), var(--iri-4), var(--iri-1));
  -webkit-mask: linear-gradient(#000, #000) content-box, linear-gradient(#000, #000);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#000, #000) content-box, linear-gradient(#000, #000);
  mask-composite: exclude;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

a.card:hover {
  color: inherit;
  box-shadow: 0 12px 30px -12px rgba(139, 92, 246, 0.4), var(--shadow-md);
  transform: translateY(-3px);
}

a.card:hover::before {
  opacity: 1;
}

a.card:focus-visible {
  outline: 2px solid var(--iri-2);
  outline-offset: 3px;
}

.card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 34px;
  height: 34px;
  margin-bottom: 1.1rem;
  color: var(--iri-2);
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: border-color 0.2s ease;
}

.card-icon svg {
  display: block;
  width: 18px;
  height: 18px;
}

a.card:hover .card-icon {
  border-color: var(--iri-2);
}

.card-title {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.card-body {
  flex: 1;
  margin: 0 0 1rem;
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text-secondary);
}

.card-body p {
  margin: 0;
  color: inherit;
}

.card-body p + p {
  margin-top: 0.5rem;
}

.card-arrow {
  font-size: 1.2rem;
  line-height: 1.6;
  color: var(--text-secondary);
  transition: transform 0.2s, color 0.2s;
}

a.card:hover .card-arrow {
  transform: translateX(4px);
  color: var(--primary-color);
}

/* Unlinked cards: one panel split by hairlines, with a mono eyebrow for a
   title (the "Your Data Stays Yours" look). */
.band-cards:has(> .cards > div.card) {
  max-width: 1100px;
  padding: 4.5rem 1.5rem 0;
}

.cards:has(> div.card) {
  gap: 1px;
  background: var(--border-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

div.card {
  display: flex;
  flex-direction: column;
  padding: 1.6rem 1.5rem;
  background: var(--bg-color);
}

div.card .card-title {
  margin: 0 0 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 400;
  line-height: 1.6;
  letter-spacing: 0.1em;
  color: var(--iri-2);
}

div.card .card-body {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.6;
}

div.card .card-icon {
  margin-bottom: 0.9rem;
}

/* The Explore section: two wide cards per row, icon and arrow on one line,
   a violet edge that draws in on hover. Keyed on the section id so other
   card sections keep the tile look. */
#explore .cards {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

#explore a.card {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto auto 1fr;
  grid-template-areas:
    "icon arrow"
    "title title"
    "body body";
  align-items: center;
  overflow: hidden;
}

#explore a.card::before {
  display: none;
}

#explore a.card::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--gradient-iri);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.3s ease;
}

#explore a.card:hover {
  border-color: transparent;
  box-shadow: 0 10px 28px -12px rgba(139, 92, 246, 0.35), var(--shadow-md);
}

#explore a.card:hover::after {
  transform: scaleY(1);
}

#explore .card-icon {
  grid-area: icon;
  margin-bottom: 1rem;
}

#explore .card-arrow {
  grid-area: arrow;
  justify-self: end;
  margin-bottom: 1rem;
}

#explore .card-title {
  grid-area: title;
  font-size: 1.2rem;
  letter-spacing: -0.015em;
  text-transform: none;
}

#explore .card-body {
  grid-area: body;
  align-self: start;
  margin: 0;
  font-size: 0.9rem;
}

/* ── Figures: a lede, a paragraph, and a column of measured values. ── */

.band-figures {
  max-width: 1100px;
  padding: 4.5rem 1.5rem 0;
}

.figures-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 3rem;
  align-items: start;
}

.figures-main p {
  max-width: 58ch;
  margin: 0 0 1rem;
  color: var(--text-secondary);
}

.figures-main p:last-child {
  margin-bottom: 0;
}

.figures-main > p:first-child {
  max-width: none;
  font-size: 1.15rem;
  line-height: 1.55;
  color: var(--text-main);
}

.figures-main strong {
  color: inherit;
}

.figures {
  display: flex;
  flex-direction: column;
  margin: 0;
  border-top: 1px solid var(--border-color);
}

.figure {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--border-color);
}

/* Signal colour, used here and nowhere else: these values came off an
   instrument, not a marketing deck. */
.figure dt {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  color: var(--signal);
}

.figure dd {
  max-width: 22ch;
  margin: 0;
  font-size: 0.85rem;
  text-align: right;
  color: var(--text-secondary);
}

.figure dd p {
  margin: 0;
  color: inherit;
}

/* ── Steps ── */

.band-steps {
  max-width: 800px;
}

.steps {
  display: flex;
  flex-direction: column;
  margin: 0;
  padding: 0;
  list-style: none;
}

.step {
  display: flex;
  align-items: flex-start;
  gap: 2rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid transparent;
  border-image: var(--gradient-hairline) 1;
}

.step:last-child {
  border-bottom: none;
}

.step-num {
  min-width: 3rem;
  font-size: 2.2rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -1px;
  background: var(--gradient-iri);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  opacity: 0.55;
}

.step-content {
  min-width: 0;
}

.step-title {
  margin: 0 0 0.3rem;
  font-size: 1rem;
}

.step-body {
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--text-secondary);
}

.step-body p {
  margin: 0;
  color: inherit;
}

.step-body p + p {
  margin-top: 0.5rem;
}

/* ── Banner ── */

.band-banner {
  max-width: none;
  padding: 5rem 2rem;
  text-align: center;
  background: var(--gradient-iri-soft);
  border-top: 1px solid transparent;
  border-image: var(--gradient-hairline) 1;
}

.band-banner > * {
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.band-banner .section-title {
  margin-bottom: 2rem;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: -0.015em;
  text-transform: none;
}

.band-banner .section-body {
  margin-top: -1rem;
}

.band-banner > .actions {
  justify-content: center;
  margin-top: 0;
}

/* ── 11. Responsive ────────────────────────────────────────────────────── */

@media (max-width: 1100px) {
  .stat {
    padding: 2.5rem 2rem;
  }
}

@media (max-width: 900px) {
  /* Landing */
  .hero {
    flex-direction: column;
    gap: 2rem;
    padding: 3rem 1.5rem 2rem;
    text-align: center;
  }

  .hero-inner {
    max-width: 100%;
  }

  .hero-title {
    font-size: 3.5rem;
  }

  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }

  .hero .actions {
    justify-content: center;
  }

  .stats-inner {
    flex-wrap: wrap;
  }

  .stat {
    padding: 2rem 1.5rem;
  }

  .band {
    padding: 3.5rem 1.5rem;
  }

  .band-figures,
  .band-cards:has(> .cards > div.card) {
    padding: 3.5rem 1.5rem 0;
  }

  .band-banner {
    padding: 4rem 1.5rem;
  }

  .cards:has(> :nth-child(4):last-child) {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
  }

  .cards:has(> :nth-child(3):last-child),
  #explore .cards {
    grid-template-columns: minmax(0, 1fr);
  }

  .cards:has(> div.card) {
    gap: 1px;
  }

  .figures-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 2rem;
  }

  .figure dd {
    max-width: none;
  }

  /* Docs: the sidebar leaves the grid. With script it becomes an off-canvas
     drawer behind the Menu button; without script it sits above the
     article as a plain list, so the docs stay navigable. */
  .page-doc .layout {
    display: block;
  }

  .page-doc .content {
    padding: 2rem 1.25rem;
  }

  .page-doc .sidebar {
    border-right: none;
    border-image: none;
    border-bottom: 1px solid var(--border-color);
  }

  .page-doc .sidebar-nav {
    position: static;
    max-height: none;
    padding: 1.5rem 1.25rem;
  }

  html.js .page-doc .nav-toggle {
    display: inline-flex;
  }

  html.js .page-doc .sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 300;
    width: min(300px, 82vw);
    overflow-y: auto;
    overscroll-behavior: contain;
    background: var(--bg-secondary);
    border-right: 1px solid var(--glass-border);
    border-bottom: none;
    box-shadow: var(--shadow-lg);
    transform: translateX(-100%);
    visibility: hidden;
  }

  html.js .page-doc .sidebar.open {
    transform: none;
    visibility: visible;
  }

  html.js .page-doc .sidebar-nav {
    padding: 2rem 1rem 2.5rem;
  }

  body.nav-open {
    overflow: hidden;
  }

  .page-standalone .layout {
    padding: 2rem 1.25rem;
  }
}

@media (max-width: 900px) and (prefers-reduced-motion: no-preference) {
  html.js .page-doc .sidebar {
    transition: transform 0.25s ease, visibility 0s linear 0.25s;
  }

  html.js .page-doc .sidebar.open {
    transition: transform 0.25s ease, visibility 0s linear 0s;
  }
}

@media (max-width: 768px) {
  /* Two header rows cover more of the page; keep text from showing through. */
  .site-header {
    padding: 0.6rem 0;
    background: var(--bg-color);
  }

  .header-inner {
    padding: 0 1rem;
    row-gap: 0.35rem;
  }

  /* Brand and toggles on the first row, the links on their own row. */
  .header-nav {
    order: 3;
    flex-basis: 100%;
    justify-content: center;
    gap: 0.25rem;
  }

  .header-link {
    padding: 0.4rem 0.6rem;
    font-size: 0.9rem;
  }

  html.js .theme-toggle {
    margin-left: 0;
  }

  .page-doc .layout,
  .page-standalone .layout {
    border-left: none;
    border-right: none;
    border-radius: 0;
  }

  .prose h1 {
    font-size: 1.75rem;
  }

  .prose.not-found h1 {
    font-size: 2.4rem;
  }

  .prose h2 {
    font-size: 1.3rem;
  }
}

@media (max-width: 600px) {
  .hero-title {
    font-size: 2.5rem;
    letter-spacing: -2px;
  }

  .hero-figure {
    width: 100%;
  }

  .stats-inner {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .stat {
    padding: 1.5rem 1rem;
  }

  .stat + .stat::before {
    display: none;
  }

  .stat-value {
    font-size: 1.3rem;
  }

  .section-title {
    margin-bottom: 2rem;
    font-size: 1.25rem;
    letter-spacing: 2px;
  }

  .cards:has(> :nth-child(2):last-child),
  .cards:has(> :nth-child(4):last-child) {
    grid-template-columns: minmax(0, 1fr);
  }

  a.card {
    padding: 1.5rem;
  }

  .step {
    gap: 1.25rem;
  }

  .step-num {
    min-width: 2.5rem;
    font-size: 1.8rem;
  }

  .figure {
    flex-direction: column;
    gap: 0.15rem;
  }

  .figure dd {
    text-align: left;
  }
}