/* Grounded AI Practice — landing site stylesheet. Palette and roles from project_brief.md "Visual identity". No external resources are loaded: Public Sans is self-hosted as subsetted WOFF2 (tools/build_site_fonts.py), with local() sources first so an installed copy is preferred, and the system stack as fallback. Light and dark themes follow the visitor's own setting (prefers-color-scheme); dark surfaces use Ink, matching the brand's reversed asset conventions. */ @font-face { font-family: "Public Sans"; font-style: normal; font-weight: 400; font-display: swap; src: local("Public Sans"), local("PublicSans-Regular"), url("fonts/public_sans_400.woff2") format("woff2"); } @font-face { font-family: "Public Sans"; font-style: italic; font-weight: 400; font-display: swap; src: local("Public Sans Italic"), local("PublicSans-Italic"), url("fonts/public_sans_400_italic.woff2") format("woff2"); } @font-face { font-family: "Public Sans"; font-style: normal; font-weight: 600; font-display: swap; src: local("Public Sans SemiBold"), local("PublicSans-SemiBold"), url("fonts/public_sans_600.woff2") format("woff2"); } @font-face { font-family: "Public Sans"; font-style: normal; font-weight: 700; font-display: swap; src: local("Public Sans Bold"), local("PublicSans-Bold"), url("fonts/public_sans_700.woff2") format("woff2"); } @font-face { font-family: "Public Sans"; font-style: normal; font-weight: 800; font-display: swap; src: local("Public Sans ExtraBold"), local("PublicSans-ExtraBold"), url("fonts/public_sans_800.woff2") format("woff2"); } :root { --ink: #27221E; --ember: #F15E4B; --sand: #F9E8DC; --paper: #F9F9F9; --mist: #EFEEED; --sage: #D5E2E1; --stone: #6E6E6E; --graphite: #404040; --bg: var(--paper); --text: var(--ink); --muted: var(--graphite); --faint: var(--stone); --band: var(--mist); --band-warm: var(--sand); --card: #FFFFFF; --hairline: color-mix(in srgb, var(--stone) 35%, transparent); --btn-text: var(--ink); color-scheme: light dark; } /* Dark values appear twice: once behind the system query (unless the visitor has overridden to light) and once behind the manual override (docs/theme.js sets data-theme on ). Keep the two blocks identical when editing either. */ @media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) { --bg: var(--ink); --text: var(--paper); --muted: var(--mist); --faint: color-mix(in srgb, var(--mist) 80%, var(--ink)); --band: color-mix(in srgb, var(--ink) 94%, white); --band-warm: color-mix(in srgb, var(--ink) 90%, var(--ember)); --card: color-mix(in srgb, var(--ink) 88%, white); --hairline: color-mix(in srgb, var(--stone) 55%, transparent); } } :root[data-theme="dark"] { --bg: var(--ink); --text: var(--paper); --muted: var(--mist); --faint: color-mix(in srgb, var(--mist) 80%, var(--ink)); --band: color-mix(in srgb, var(--ink) 94%, white); --band-warm: color-mix(in srgb, var(--ink) 90%, var(--ember)); --card: color-mix(in srgb, var(--ink) 88%, white); --hairline: color-mix(in srgb, var(--stone) 55%, transparent); } * { box-sizing: border-box; margin: 0; padding: 0; } html { -webkit-text-size-adjust: 100%; } @media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } } body { font-family: "Public Sans", "Segoe UI", -apple-system, system-ui, Arial, sans-serif; font-size: 1.0625rem; line-height: 1.65; color: var(--text); background: var(--bg); } img { max-width: 100%; height: auto; display: block; } /* ---------------------------------------------------------- utilities */ .container { max-width: 66rem; margin-inline: auto; padding-inline: clamp(1.25rem, 4vw, 2.5rem); } .prose { max-width: 46rem; } .visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; } .skip-link { position: absolute; left: 1rem; top: -4rem; z-index: 10; background: var(--ember); color: var(--ink); font-weight: 700; padding: 0.6rem 1rem; border-radius: 0.4rem; transition: top 120ms ease; } .skip-link:focus { top: 1rem; } /* --------------------------------------------------------------- text */ h1, h2, h3 { line-height: 1.2; text-wrap: balance; } h1 { font-size: clamp(1.7rem, 4.5vw, 2.6rem); font-weight: 800; } h2 { font-size: clamp(1.45rem, 3.5vw, 2rem); font-weight: 700; } h3 { font-size: 1.15rem; font-weight: 700; } p + p, .prose > * + * { margin-top: 1rem; } .prose h3 { margin-top: 2rem; } a { color: inherit; text-decoration: underline; text-decoration-color: var(--ember); text-decoration-thickness: 2px; text-underline-offset: 3px; } a:hover { text-decoration-thickness: 3px; } :focus-visible { outline: 3px solid var(--ember); outline-offset: 2px; border-radius: 2px; } .lead { font-size: 1.2rem; } .small { font-size: 0.9rem; color: var(--muted); } .mt { margin-top: 2.25rem; } .mt-s { margin-top: 0.75rem; } .nowrap { white-space: nowrap; } .eyebrow { display: block; font-size: 0.85rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--faint); margin-bottom: 0.75rem; } /* ------------------------------------------------------------- header */ .site-header { border-bottom: 1px solid var(--hairline); background: var(--bg); } .site-header .container { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 0.75rem 1.5rem; padding-block: 0.9rem; } .brand img { height: 30px; width: auto; } .site-nav ul { display: flex; flex-wrap: wrap; gap: 0.25rem 1.4rem; list-style: none; align-items: center; } .site-nav a { text-decoration: none; font-weight: 600; font-size: 0.95rem; } .site-nav a:hover { text-decoration: underline; text-decoration-color: var(--ember); text-decoration-thickness: 2px; } /* The theme switch. Hidden until docs/theme.js reveals it, so a visitor without JavaScript never sees a button that does nothing. */ .theme-toggle { font: inherit; font-size: 0.9rem; font-weight: 600; color: inherit; background: none; border: 2px solid var(--hairline); border-radius: 0.5rem; padding: 0.25rem 0.7rem; cursor: pointer; } .theme-toggle:hover { border-color: var(--ember); } /* ------------------------------------------------------------ buttons */ .btn { display: inline-block; background: var(--ember); color: var(--ink); font-weight: 700; text-decoration: none; padding: 0.7rem 1.3rem; border-radius: 0.5rem; } .btn:hover { filter: brightness(1.06); } .btn-quiet { display: inline-block; font-weight: 700; text-decoration: none; padding: 0.7rem 1.3rem; border-radius: 0.5rem; border: 2px solid var(--hairline); } .btn-quiet:hover { border-color: var(--ember); } .cta-row { display: flex; flex-wrap: wrap; gap: 0.9rem; margin-top: 1.75rem; } /* ------------------------------------------------------------- bands */ .band { padding-block: clamp(3rem, 7vw, 4.5rem); } .band-tint { background: var(--band); } .band-warm { background: var(--band-warm); } .band h2 { margin-bottom: 1rem; } /* Subpages open with their own h1 (the home page's lives in the hero); the global heading sizes already fit, these add the spacing. The narrative pages also use h2 as running subheads inside .prose. Added 2026-08-06 with the about page. */ .band h1 { margin-bottom: 1rem; } .prose h2 { margin-top: 2.5rem; } .prose > h2:first-child { margin-top: 0; } /* -------------------------------------------------------------- hero */ .hero { padding-block: clamp(3rem, 8vw, 5.5rem); } .hero-mark { margin-bottom: 2rem; } .hero-mark img { width: min(340px, 70vw); height: auto; } .notfound-mark { margin-bottom: 1.5rem; } .notfound-mark img { width: min(320px, 62vw); height: auto; } .notfound-brand { margin-top: 3.5rem; } .notfound-brand img { width: min(180px, 45vw); height: auto; opacity: 0.75; } .hero .lead { margin-top: 1.25rem; max-width: 46rem; } .hero p:not(.lead) { max-width: 46rem; } /* ------------------------------------------------------------ figures */ figure.panel { margin-block: 2rem; border: 1px solid var(--hairline); border-radius: 0.75rem; overflow: hidden; background: var(--bg); } figure.panel img { width: 100%; } figure.panel figcaption { font-size: 0.9rem; color: var(--muted); padding: 0.8rem 1.1rem; border-top: 1px solid var(--hairline); } /* --------------------------------------------------------- pull quote */ blockquote.pull { margin-block: 2.25rem; padding: 0.4rem 0 0.4rem 1.5rem; border-left: 6px solid var(--ember); border-radius: 3px; max-width: 44rem; } blockquote.pull p { font-size: clamp(1.2rem, 2.6vw, 1.5rem); font-weight: 600; line-height: 1.45; } blockquote.pull footer { margin-top: 0.6rem; font-size: 0.9rem; color: var(--muted); } /* -------------------------------------------------------------- cards */ .card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(15.5rem, 1fr)); gap: 1.25rem; margin-top: 2rem; } .card { background: var(--card); border: 1px solid var(--hairline); border-radius: 0.75rem; padding: 1.4rem; } .card h3 { margin-bottom: 0.6rem; } .card p { font-size: 0.97rem; } .card .status { display: inline-block; font-size: 0.78rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); border: 1.5px solid var(--hairline); border-radius: 999px; padding: 0.15rem 0.7rem; margin-bottom: 0.9rem; } .card-grid.rules { grid-template-columns: repeat(2, minmax(0, 1fr)); } @media (max-width: 40rem) { .card-grid.rules { grid-template-columns: 1fr; } } /* ---------------------------------------------------------- icon wells Icons are Ink linework with white interior fills, so they sit on a white well in both themes — the same construction as the Word callout cards' icon wells. */ .icon-well { display: inline-flex; align-items: center; justify-content: center; background: #FFFFFF; border: 1px solid var(--hairline); border-radius: 0.6rem; padding: 0.35rem; flex: none; } .icon-well img { width: 34px; height: 34px; } .card .icon-well { margin-bottom: 0.9rem; } .card .icon-well img { width: 40px; height: 40px; } /* ---------------------------------------------------------- claim flow */ .flowwrap { margin-top: 2.5rem; max-width: 46rem; } .flowwrap h3 { margin-bottom: 1.1rem; } .flowwrap .small { margin-top: 1rem; } ol.flow { list-style: none; counter-reset: step; display: grid; gap: 0.7rem; } ol.flow li { counter-increment: step; position: relative; background: var(--band); border: 1px solid var(--hairline); border-radius: 0.6rem; padding: 0.8rem 1.1rem 0.8rem 3.6rem; font-weight: 500; } ol.flow li::before { content: counter(step); position: absolute; left: 0.85rem; top: 50%; transform: translateY(-50%); width: 1.9rem; height: 1.9rem; border-radius: 50%; background: var(--ember); color: var(--ink); font-weight: 800; display: grid; place-items: center; } /* ------------------------------------------------------ system diagram */ .sysdiagram { display: grid; grid-template-columns: 1fr 2.2rem minmax(12rem, 0.9fr) 2.2rem 1fr; gap: 1.1rem; align-items: center; margin-top: 2.25rem; } .sys-col { list-style: none; display: grid; gap: 0.7rem; } .sys-col li { display: flex; align-items: center; gap: 0.7rem; border-radius: 0.6rem; padding: 0.55rem 0.8rem; font-size: 0.95rem; font-weight: 600; } .sys-in li { background: var(--mist); color: var(--ink); } .sys-out li { background: var(--sage); color: var(--ink); } .sys-col .icon-well { padding: 0.25rem; border-radius: 0.5rem; } .sys-col .icon-well img { width: 24px; height: 24px; } .sys-engine { display: flex; flex-direction: column; align-items: center; gap: 0.7rem; text-align: center; border: 3px solid var(--ember); border-radius: 0.8rem; padding: 1.3rem 1rem; font-weight: 700; } .sys-engine .icon-well img { width: 40px; height: 40px; } .sys-arrow { text-align: center; color: var(--faint); font-size: 1.6rem; font-weight: 700; } .sys-arrow::before { content: "\2192"; } .sys-gate { grid-column: 1 / -1; justify-self: center; display: flex; align-items: center; gap: 0.8rem; background: var(--band-warm); border-radius: 0.6rem; padding: 0.6rem 1.2rem; font-weight: 600; } .syscaption { margin-top: 1rem; } @media (max-width: 52rem) { .sysdiagram { grid-template-columns: 1fr; } .sys-arrow::before { content: "\2193"; } .sys-engine { justify-self: stretch; } } @media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .sys-in li { background: var(--card); color: var(--text); } :root:not([data-theme="light"]) .sys-out li { background: var(--card); color: var(--text); border-left: 3px solid var(--sage); } } :root[data-theme="dark"] .sys-in li { background: var(--card); color: var(--text); } :root[data-theme="dark"] .sys-out li { background: var(--card); color: var(--text); border-left: 3px solid var(--sage); } /* ------------------------------------------------------------ callout */ .callout { display: flex; align-items: flex-start; gap: 1rem; background: var(--band-warm); border-radius: 0.75rem; padding: 1.1rem 1.25rem; max-width: 46rem; } .callout .icon-well { margin-top: 0.15rem; } .callout-body { border-left: 5px solid var(--ember); border-radius: 3px; padding-left: 1rem; } /* --------------------------------------------------------- comparison */ .compare { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; margin-top: 2rem; } .compare-col { background: var(--card); border: 1px solid var(--hairline); border-radius: 0.75rem; padding: 1.25rem; } .compare-col h3 { font-size: 1rem; margin-bottom: 0.9rem; } .compare-col ul { list-style: none; display: grid; gap: 0.7rem; } .compare-col li { display: flex; align-items: center; gap: 0.7rem; font-size: 0.95rem; font-weight: 500; } .compare-col .icon-well { padding: 0.25rem; border-radius: 0.5rem; } .compare-col .icon-well img { width: 24px; height: 24px; } @media (max-width: 46rem) { .compare { grid-template-columns: 1fr; } } /* ------------------------------------------------------------ replica Terminal replicas are not currently shown on the site; these rules stay because the pattern is ready for a learning-unit page, where a picture of a real shell session earns its place. */ figure.replica { max-width: 44rem; } figure.replica img { width: 100%; } /* ------------------------------------------------------------- footer */ .site-footer { background: var(--ink); color: var(--paper); padding-block: 3rem; margin-top: 0; } .site-footer a { color: var(--paper); text-decoration-color: var(--ember); } .site-footer .foot-mark img { width: 200px; height: auto; } .site-footer .foot-cols { display: flex; flex-wrap: wrap; gap: 2rem 4rem; justify-content: space-between; align-items: flex-start; } .site-footer ul { list-style: none; display: grid; gap: 0.5rem; } .site-footer .small { color: var(--mist); } .site-footer .legal { margin-top: 2.25rem; padding-top: 1.5rem; border-top: 1px solid color-mix(in srgb, var(--stone) 45%, transparent); font-size: 0.85rem; color: var(--mist); max-width: 46rem; } @media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .site-footer { border-top: 1px solid var(--hairline); } } :root[data-theme="dark"] .site-footer { border-top: 1px solid var(--hairline); } /* ------------------------------------------------------------- print */ @media print { .site-header, .skip-link, .cta-row { display: none; } }