:root { color-scheme: dark; --ink: #f4f7ff; --muted: #b7c1d6; --page: #070a12; --panel: #101827; --line: #3b4b65; --cyan: #78aefc; --amber: #ffca68; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: linear-gradient(rgb(120 174 252 / 5%) 1px, transparent 1px), linear-gradient(90deg, rgb(120 174 252 / 5%) 1px, transparent 1px), radial-gradient(circle at 80% 0%, rgb(39 63 105 / 42%), transparent 32rem), var(--page); background-size: 3rem 3rem, 3rem 3rem, auto, auto; color: var(--ink); font-family: Inter, ui-sans-serif, system-ui, sans-serif; }
a { color: inherit; }
a:focus-visible, iframe:focus-visible { outline: 3px solid var(--amber); outline-offset: 4px; }
.skip-link { position: fixed; left: 1rem; top: 1rem; z-index: 100; transform: translateY(-180%); border-radius: .5rem; background: var(--ink); color: var(--page); padding: .75rem 1rem; font-weight: 700; }
.skip-link:focus { transform: translateY(0); }
.site-header { align-items: center; display: flex; justify-content: space-between; margin: 0 auto; max-width: 90rem; padding: 1.4rem clamp(1.25rem, 4vw, 4rem); }
.brand { align-items: center; display: inline-flex; font-family: ui-monospace, monospace; font-size: 1.05rem; font-weight: 700; gap: .7rem; text-decoration: none; }
.brand-mark { background: var(--cyan); border-radius: 50%; box-shadow: 0 0 0 .35rem rgb(51 214 232 / 12%); height: .7rem; width: .7rem; }
nav { display: flex; gap: clamp(1rem, 3vw, 2.2rem); }
nav a, .text-link { color: var(--muted); font-size: .92rem; font-weight: 600; text-decoration-thickness: 1px; text-underline-offset: .35rem; }
nav a:hover, .text-link:hover { color: var(--ink); }
.hero, .topology-section, .stack-model, .content-section, .page-intro, .catalog-tools, .results-status, .app-grid, .empty-state, .detail, .steps, .guidance-grid { margin-inline: auto; max-width: 90rem; padding-inline: clamp(1.25rem, 4vw, 4rem); }
.hero { padding-block: clamp(4.5rem, 10vw, 9rem) clamp(4rem, 8vw, 7rem); }
.eyebrow { color: var(--cyan); display: block; font-family: ui-monospace, monospace; font-size: .78rem; font-weight: 700; letter-spacing: .12em; margin-bottom: 1rem; text-transform: uppercase; }
h1, h2, p { margin-top: 0; }
h1 { font-size: clamp(3rem, 8vw, 7.5rem); letter-spacing: -.065em; line-height: .92; margin-bottom: 1.8rem; max-width: 13ch; }
.hero > p { color: var(--muted); font-size: clamp(1.1rem, 2vw, 1.35rem); line-height: 1.65; max-width: 44rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-block: 2rem 4rem; }
.button { border: 1px solid var(--line); border-radius: .75rem; display: inline-flex; font-weight: 750; justify-content: center; padding: .9rem 1.2rem; text-decoration: none; }
.button.primary { background: var(--cyan); border-color: var(--cyan); color: #031216; }
.button.secondary { background: rgb(11 18 33 / 72%); }
.stats { display: grid; gap: 1px; grid-template-columns: repeat(3, minmax(0, 1fr)); margin: 0; max-width: 50rem; }
.stats div { border-left: 1px solid var(--line); display: flex; flex-direction: column-reverse; padding-left: 1.2rem; }
.stats dt { color: var(--muted); font-size: .82rem; line-height: 1.4; }
.stats dd { font-family: ui-monospace, monospace; font-size: clamp(1.6rem, 4vw, 2.4rem); font-weight: 700; margin: 0 0 .2rem; }
.topology-section { padding-bottom: 6rem; }
.section-heading { align-items: end; display: flex; justify-content: space-between; margin-bottom: 1rem; }
h2 { font-size: clamp(2rem, 5vw, 4rem); letter-spacing: -.045em; line-height: 1; margin-bottom: 0; }
.section-intro, .stack-model p { color: var(--muted); line-height: 1.65; max-width: 52rem; }
.topology-frame { background: #070c18; border: 1px solid var(--line); border-radius: 1rem; box-shadow: 0 2rem 8rem rgb(0 0 0 / 35%); margin-top: 2rem; overflow: hidden; }
.topology-frame iframe { border: 0; display: block; height: min(76vh, 60rem); min-height: 42rem; width: 100%; }
.stack-model { border-top: 1px solid var(--line); padding-block: 5rem 8rem; }
.stack-model h2 { max-width: 15ch; }
.stack-model p { font-size: 1.1rem; margin-top: 1.5rem; }
.content-section { padding-block: 5rem; }
.content-section + .content-section { border-top: 1px solid var(--line); }
.content-section.split { align-items: start; display: grid; gap: 3rem; grid-template-columns: 1fr 1fr; }
.category-grid { display: grid; gap: .8rem; grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr)); margin-top: 2rem; }
.category { background: var(--panel); border: 1px solid var(--line); border-radius: .75rem; font-weight: 700; padding: 1.25rem; text-decoration: none; }
.category:hover { border-color: var(--cyan); }
.page-intro { padding-block: clamp(4rem, 8vw, 7rem) 3rem; }
.page-intro h1 { font-size: clamp(2.8rem, 7vw, 6rem); }
.page-intro p, .detail-header p { color: var(--muted); font-size: 1.2rem; line-height: 1.65; max-width: 48rem; }
.catalog-tools { align-items: end; display: grid; gap: 1rem; grid-template-columns: 2fr 1fr; }
.catalog-tools label { display: block; font-weight: 700; margin-bottom: .5rem; }
input, select { background: var(--panel); border: 1px solid var(--line); border-radius: .6rem; color: var(--ink); font: inherit; min-height: 3rem; padding: .7rem .8rem; width: 100%; }
input:focus-visible, select:focus-visible { outline: 3px solid var(--amber); outline-offset: 2px; }
.results-status { color: var(--muted); padding-block: 1.5rem; }
.app-grid, .guidance-grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr)); padding-bottom: 6rem; }
.app-card, .guidance-grid article { background: var(--panel); border: 1px solid var(--line); border-radius: .9rem; padding: 1.4rem; }
.app-card h2 { font-size: 1.4rem; letter-spacing: -.02em; margin-block: 1.2rem .7rem; }
.app-card p, .guidance-grid p { color: var(--muted); line-height: 1.55; }
.card-meta, .tag-row { align-items: center; display: flex; flex-wrap: wrap; gap: .45rem; }
.card-meta > span:first-child { color: var(--muted); font-size: .78rem; margin-right: auto; }
.tag { border: 1px solid var(--line); border-radius: 999px; display: inline-block; font-size: .72rem; font-weight: 700; padding: .25rem .5rem; }
.tag.safe { border-color: #327e65; color: #8ce4bd; }
.tag.warning { border-color: #8c692d; color: #ffd486; }
.tag.danger { border-color: #98434d; color: #ffadb6; }
[hidden] { display: none !important; }
.empty-state { padding-bottom: 6rem; }
.detail { max-width: 70rem; padding-block: 3rem 7rem; }
.back-link { color: var(--muted); display: inline-block; margin-bottom: 3rem; }
.detail-header { margin-bottom: 4rem; }
.facts { display: grid; gap: 1px; grid-template-columns: repeat(2, minmax(0, 1fr)); margin-block: 2rem 4rem; }
.facts div { background: var(--panel); border: 1px solid var(--line); padding: 1.2rem; }
.facts dt { color: var(--muted); font-size: .82rem; margin-bottom: .4rem; }
.facts dd { font-weight: 700; margin: 0; }
.callout { background: var(--panel); border: 1px solid var(--line); border-radius: 1rem; margin-top: 3rem; padding: clamp(1.5rem, 4vw, 3rem); }
.callout p { color: var(--muted); line-height: 1.6; margin-block: 1.2rem 1.8rem; max-width: 48rem; }
.steps { counter-reset: step; list-style: none; max-width: 70rem; padding-bottom: 5rem; }
.steps li { border-top: 1px solid var(--line); counter-increment: step; padding-block: 2rem; padding-left: 4rem; position: relative; }
.steps li::before { color: var(--cyan); content: counter(step, decimal-leading-zero); font-family: ui-monospace, monospace; left: 0; position: absolute; }
.steps p { color: var(--muted); line-height: 1.6; margin: .6rem 0 0; }
.guidance-grid { padding-top: 1rem; }
footer { border-top: 1px solid var(--line); color: var(--muted); line-height: 1.6; padding: 2rem clamp(1.25rem, 4vw, 4rem); }
footer p { margin: 0 auto; max-width: 82rem; }
@media (max-width: 720px) { .site-header { align-items: start; gap: 1.2rem; } nav { flex-wrap: wrap; justify-content: end; } .hero { padding-top: 4rem; } .stats, .facts, .catalog-tools, .content-section.split { gap: 1rem; grid-template-columns: 1fr; } .section-heading { align-items: start; flex-direction: column; gap: 1.25rem; } .topology-frame iframe { height: 70vh; min-height: 34rem; } }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

/* Atlas reading details. */
::selection { background: var(--amber); color: var(--page); }
h1, h2, h3 { text-wrap: balance; }
p, li { text-wrap: pretty; }