/* ideennest design system (docs/ARCHITECTURE.md §7): tokens, layout, components.
   No JavaScript, no web fonts; colours checked for WCAG AA contrast in tests/test_publishing.py. */

:root {
  color-scheme: light dark;
  --bg: #f7f4ee;
  --surface: #ffffff;
  --surface-2: #efe9df;
  --text: #1c2826;
  --muted: #4d5b58;
  --primary: #1d4e57;
  --primary-hover: #163d44;
  --primary-ink: #ffffff;
  --primary-soft: #e2ebea;
  --accent: #c8842b;
  --accent-soft: #f4e3cb;
  --line: #ddd5c8;
  --header-bg: rgb(247 244 238 / 0.9);
  --focus: #1d4e57;
  --shadow-s: 0 1px 2px rgb(28 40 38 / 0.06);
  --contours: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='640' height='320' viewBox='0 0 640 320' fill='none' stroke='%23000' stroke-opacity='1' stroke-width='1.3'%3E%3Cpath d='M-40 30 C 60 12 140 48 240 30 S 420 12 520 30 S 640 48 700 30'/%3E%3Cpath d='M-40 72 C 60 48 140 96 240 72 S 420 48 520 72 S 640 96 700 72'/%3E%3Cpath d='M-40 114 C 60 84 140 144 240 114 S 420 84 520 114 S 640 144 700 114'/%3E%3Cpath d='M-40 156 C 60 138 140 174 240 156 S 420 138 520 156 S 640 174 700 156'/%3E%3Cpath d='M-40 198 C 60 174 140 222 240 198 S 420 174 520 198 S 640 222 700 198'/%3E%3Cpath d='M-40 240 C 60 210 140 270 240 240 S 420 210 520 240 S 640 270 700 240'/%3E%3Cpath d='M-40 282 C 60 264 140 300 240 282 S 420 264 520 282 S 640 300 700 282'/%3E%3Cpath d='M-40 324 C 60 300 140 348 240 324 S 420 300 520 324 S 640 348 700 324'/%3E%3C/svg%3E");
  --contour-opacity: 0.11;
  --radius: 16px;
  --radius-s: 10px;
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Iowan Old Style", "Palatino Linotype", Palatino, Charter, "Bitstream Charter", Georgia, serif;
  --wrap: 72rem;
  --prose: 42rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111a1b;
    --surface: #172224;
    --surface-2: #1c292b;
    --text: #e7ecea;
    --muted: #a7b5b2;
    --primary: #7cc3ce;
    --primary-hover: #9fd5dd;
    --primary-ink: #0e1a1c;
    --primary-soft: #1d3437;
    --accent: #e0a458;
    --accent-soft: #3a2c19;
    --line: #2a393b;
    --header-bg: rgb(17 26 27 / 0.88);
    --focus: #7cc3ce;
    --contour-opacity: 0.10;
    --shadow-s: none;
    }
}

/* Base */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-padding-top: 7rem; } /* sticky header never hides a focused element */
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 1.0625rem/1.65 var(--font-sans);
  -webkit-font-smoothing: antialiased;
}
svg { display: block; }
.wrap { width: min(100% - 2.5rem, var(--wrap)); margin-inline: auto; }
a { color: var(--primary); text-underline-offset: 0.18em; text-decoration-thickness: 0.08em; }
a:hover { color: var(--primary-hover); }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; border-radius: 4px; }
.skip { position: absolute; left: -999px; top: 0.5rem; z-index: 20; padding: 0.5rem 0.8rem; background: var(--surface); border-radius: var(--radius-s); }
.skip:focus { left: 1rem; }
h1, h2, h3 { font-family: var(--font-serif); font-weight: 600; line-height: 1.2; letter-spacing: -0.01em; color: var(--text); }
h1 { font-size: clamp(2rem, 1.4rem + 2.6vw, 3.25rem); margin: 0.25rem 0 1rem; }
h2 { font-size: clamp(1.45rem, 1.2rem + 1vw, 2rem); margin: 0 0 0.75rem; }
h3 { font-size: 1.2rem; margin: 0 0 0.35rem; }
p { margin: 0 0 1rem; }
.lead { max-width: 40rem; font-size: clamp(1.1rem, 1rem + 0.5vw, 1.3rem); color: var(--muted); }
.prose { max-width: var(--prose); }
.icon { width: 24px; height: 24px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.75; stroke-linecap: round; stroke-linejoin: round; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--header-bg);
  -webkit-backdrop-filter: saturate(1.4) blur(10px);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.5rem 1.5rem; padding-block: 0.8rem; }
.brand { display: inline-flex; align-items: center; gap: 0.55rem; font-family: var(--font-serif); font-size: 1.35rem; font-weight: 700; letter-spacing: -0.01em; color: var(--text); text-decoration: none; }
.brand:hover { color: var(--text); }
.logo-mark { width: 30px; height: 30px; }
.logo-egg { fill: var(--accent); }
.logo-shine { fill: none; stroke: #fff; stroke-opacity: 0.6; stroke-width: 1.3; stroke-linecap: round; }
.logo-nest { fill: none; stroke: var(--primary); stroke-width: 2.3; stroke-linecap: round; }
.site-nav ul { display: flex; flex-wrap: wrap; gap: 0.25rem; margin: 0; padding: 0; list-style: none; }
.site-nav a { display: block; padding: 0.4rem 0.8rem; border-radius: 999px; color: var(--text); font-size: 0.98rem; font-weight: 500; text-decoration: none; transition: background-color 0.15s ease, color 0.15s ease; }
.site-nav a:hover { background: var(--primary-soft); color: var(--primary); }
.site-nav a[aria-current="page"] { background: var(--primary); color: var(--primary-ink); }

/* Hero */
.hero { position: relative; overflow: hidden; background-color: var(--surface-2); border-bottom: 1px solid var(--line); }
.hero::before { content: ""; position: absolute; inset: 0; background-color: var(--primary); opacity: var(--contour-opacity); -webkit-mask: var(--contours) 0 0 / 640px 320px repeat; mask: var(--contours) 0 0 / 640px 320px repeat; pointer-events: none; }
.hero::after { content: ""; position: absolute; right: -12rem; bottom: -22rem; width: 40rem; height: 40rem; border-radius: 50%; background: radial-gradient(closest-side, var(--accent-soft), transparent); pointer-events: none; }
.hero-inner { position: relative; z-index: 1; padding-block: clamp(3rem, 2rem + 5vw, 6rem); }
.hero-compact .hero-inner { padding-block: clamp(2.25rem, 1.5rem + 3vw, 4rem); }
.hero h1 { max-width: 24ch; text-wrap: balance; }
.hero h1::after { content: ""; display: block; width: 4.5rem; height: 4px; margin-top: 1.1rem; border-radius: 2px; background: var(--accent); }
.eyebrow { margin: 0 0 0.5rem; color: var(--primary); font-size: 0.8rem; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; }
.eyebrow a { color: inherit; text-decoration: none; }
.eyebrow a:hover { text-decoration: underline; }
.badges { display: flex; flex-wrap: wrap; gap: 0.6rem; margin: 1.5rem 0 0; padding: 0; list-style: none; }
.badges li { display: inline-flex; align-items: center; gap: 0.45rem; padding: 0.5rem 0.95rem; background: var(--surface); border: 1px solid var(--line); border-radius: 999px; box-shadow: var(--shadow-s); font-size: 0.95rem; font-weight: 600; }
.badges .icon { width: 20px; height: 20px; color: var(--primary); }

/* Sections */
.content { padding-block: clamp(2rem, 1.5rem + 3vw, 4rem) 0; }
.section { margin: 0 0 clamp(2.75rem, 2rem + 3vw, 4.5rem); }
.section-lead { max-width: 40rem; color: var(--muted); }
.intro .prose { font-size: 1.12rem; }
.subhead { margin: 2rem 0 0.9rem; color: var(--muted); font-family: var(--font-sans); font-size: 0.85rem; letter-spacing: 0.08em; text-transform: uppercase; }

/* Example needs */
.needs { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(16rem, 100%), 1fr)); gap: 0.75rem; margin: 1rem 0 0; padding: 0; list-style: none; }
.needs li { position: relative; padding: 1rem 1.1rem 1rem 2.6rem; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-s); box-shadow: var(--shadow-s); font-family: var(--font-serif); font-size: 1.06rem; }
.needs li::before { content: ""; position: absolute; left: 1.1rem; top: 1.35rem; width: 0.7rem; height: 0.7rem; border-radius: 50%; background: var(--accent); }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(15rem, 100%), 1fr)); gap: 1rem; margin: 1rem 0 0; padding: 0; list-style: none; counter-reset: step; }
.steps li { padding: 1.4rem 1.3rem 1.25rem; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow-s); counter-increment: step; }
.step-icon { display: inline-grid; place-items: center; width: 2.75rem; height: 2.75rem; margin-bottom: 0.9rem; border-radius: 12px; background: var(--primary); color: var(--primary-ink); }
.step-icon .icon { width: 22px; height: 22px; }
.steps h3::before { content: counter(step) ". "; color: var(--primary); }
.steps p { margin: 0; color: var(--muted); }
.steps .claim { margin: -0.15rem 0 0.5rem; color: var(--primary); font-weight: 600; }

/* Verticals and tiles */
.vertical { margin-top: 1.25rem; }
.vertical-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 0.5rem 1rem; margin-bottom: 0.9rem; }
.vertical-head h3 { margin: 0; font-size: 1.35rem; }
.vertical-head h3 a { color: var(--text); text-decoration: none; }
.status-pill { display: inline-block; margin-left: 0.4rem; padding: 0.1rem 0.6rem; border: 1px dashed var(--muted); border-radius: 999px; color: var(--muted); font-family: var(--font-sans); font-size: 0.72rem; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; vertical-align: middle; }
.vertical-head h3 a:hover { color: var(--primary); }
.more { display: inline-flex; align-items: center; gap: 0.35rem; font-weight: 600; text-decoration: none; }
.more .icon { width: 18px; height: 18px; }
.tiles { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(14.5rem, 100%), 1fr)); gap: 0.9rem; margin: 0; padding: 0; list-style: none; }
.tile { display: grid; grid-template-columns: auto 1fr; align-items: start; gap: 0.2rem 0.85rem; padding: 1.1rem 1.1rem 1.15rem; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow-s); }
.tile > .icon { grid-row: span 2; width: 2.6rem; height: 2.6rem; padding: 0.55rem; border-radius: 12px; background: var(--primary-soft); color: var(--primary); }
.tile strong { font-size: 1.05rem; }
.criteria { grid-column: 2; color: var(--muted); font-size: 0.92rem; line-height: 1.45; }
.chips { display: flex; flex-wrap: wrap; grid-column: 2; gap: 0.35rem; margin: 0.35rem 0 0; padding: 0; list-style: none; }
.chips li { padding: 0.15rem 0.6rem; background: var(--surface-2); border: 1px solid var(--line); border-radius: 999px; font-size: 0.85rem; }
.tile-muted { background: transparent; border-style: dashed; box-shadow: none; }
.tile-muted > .icon { background: var(--surface-2); color: var(--muted); }

/* Callout */
.callout { display: grid; grid-template-columns: auto 1fr; align-items: start; gap: 1rem; margin: 0 0 clamp(2.75rem, 2rem + 3vw, 4.5rem); padding: 1.3rem 1.4rem; background: var(--primary-soft); border: 1px solid color-mix(in srgb, var(--primary) 25%, transparent); border-left: 4px solid var(--primary); border-radius: var(--radius-s); }
.callout > .icon { width: 1.6rem; height: 1.6rem; color: var(--primary); }
.callout h2 { margin-bottom: 0.35rem; font-size: 1.2rem; }
.callout p:last-child, .callout ul:last-child { margin-bottom: 0; }

/* Methodology, about, legal */
.method, .prose-page, .legal { max-width: var(--prose); }
.method { counter-reset: method; }
.method > section { margin-bottom: 2.25rem; }
.method > section > h2 { display: flex; align-items: baseline; gap: 0.7rem; font-size: 1.5rem; }
.method > section:not(.callout) > h2::before { content: counter(method, decimal-leading-zero); counter-increment: method; color: var(--primary); font-family: var(--font-sans); font-size: 0.9rem; font-weight: 700; }
.method ul { padding-left: 1.2rem; }
.method li { margin-bottom: 0.45rem; }
.author-card { display: flex; align-items: center; gap: 1rem; margin-bottom: 1.75rem; padding: 1.1rem 1.25rem; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow-s); }
.avatar { display: grid; flex: none; place-items: center; width: 3.5rem; height: 3.5rem; border-radius: 50%; background: var(--primary); color: var(--primary-ink); font-family: var(--font-serif); font-size: 1.25rem; font-weight: 700; }
.author-card span:not(.avatar) { display: block; color: var(--muted); font-size: 0.95rem; }
.legal h2 { margin-top: 2rem; font-size: 1.25rem; }
address { font-style: normal; }
code { padding: 0.05em 0.35em; border-radius: 4px; background: var(--surface-2); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.9em; }
.contact-img { display: inline-block; max-width: 100%; height: auto; vertical-align: middle; margin-inline: 0.2rem; }
address .contact-img { display: block; margin: 0.35rem 0 0.5rem; }
address .contact .contact-img { display: inline-block; margin: 0 0.2rem; }

/* Footer */
.site-footer { margin-top: clamp(1rem, 0.5rem + 2vw, 2.5rem); background: var(--surface-2); border-top: 1px solid var(--line); color: var(--muted); font-size: 0.95rem; }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(12rem, 100%), 1fr)); gap: 1.75rem 2rem; padding-block: 2.5rem 1.5rem; }
.footer-title { margin: 0 0 0.6rem; color: var(--text); font-family: var(--font-sans); font-size: 0.8rem; letter-spacing: 0.1em; text-transform: uppercase; }
.site-footer ul { display: grid; gap: 0.4rem; margin: 0; padding: 0; list-style: none; }
.site-footer a:not(.brand) { color: var(--muted); text-decoration: none; }
.site-footer a:not(.brand):hover { color: var(--primary); text-decoration: underline; }
.tagline { margin: 0.6rem 0 0; }
.footer-bottom { padding-block: 1rem 1.5rem; border-top: 1px solid var(--line); font-size: 0.85rem; }
.footer-bottom p { margin: 0; }

/* Motion: gentle entrance, only when the visitor allows it */
@media (prefers-reduced-motion: no-preference) {
  .hero-inner > * { animation: rise 0.6s ease both; }
  .hero-inner > :nth-child(2) { animation-delay: 0.06s; }
  .hero-inner > :nth-child(3) { animation-delay: 0.12s; }
  .hero-inner > :nth-child(4) { animation-delay: 0.18s; }
  .more .icon { transition: transform 0.2s ease; }
  .more:hover .icon { transform: translateX(3px); }
  @keyframes rise { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}