/* sfdemo.aetheria.systems: the Aetheria editorial system. Paper, ink, one teal. */
:root {
  --paper: #FAFAF7; --paper-2: #F3F2EC; --card: #FFFFFF;
  --ink: #15171A; --ink-2: #3F4349; --ink-3: #6B7078;
  --line: #E3E1D9; --line-strong: #C9C6BB;
  --teal: #0B6E7F; --teal-hover: #095A68; --teal-soft: #E4F1F3;
  --sans: "Geist", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "Geist Mono", ui-monospace, monospace;
  --pad-x: 1.5rem; --sec: 2.5rem; --gap: 1.5rem;
}
@media (min-width: 768px) { :root { --pad-x: 2rem; --sec: 4rem; } }
* { box-sizing: border-box; }
img, svg { max-width: 100%; height: auto; }
.grid > *, .row > * { min-width: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 5rem; }
body { margin: 0; background: var(--paper); color: var(--ink-2); font-family: var(--sans); font-size: 1.0625rem; line-height: 1.6; -webkit-font-smoothing: antialiased; overflow-wrap: anywhere; }
h1, h2, h3, h4 { font-family: var(--sans); font-weight: 600; color: var(--ink); margin: 0; letter-spacing: -0.01em; line-height: 1.15; }
h1 { font-size: clamp(2.125rem, 1.4rem + 2.6vw, 3.25rem); line-height: 1.1; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.75rem, 1.35rem + 1.2vw, 2.125rem); }
h3 { font-size: clamp(1.125rem, 1.05rem + 0.35vw, 1.375rem); line-height: 1.25; }
p, li { max-width: 65ch; }
p { margin: 0; }
a { color: var(--teal); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--teal-hover); }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 3px solid var(--teal); outline-offset: 3px; border-radius: 2px; }
::selection { background: #d8ebee; color: var(--ink); }
.wrap { max-width: 72rem; margin: 0 auto; padding-left: var(--pad-x); padding-right: var(--pad-x); }
.narrow { max-width: 44rem; }
.mt-05 { margin-top: 0.5rem; } .mt-1 { margin-top: 1rem; } .mt-15 { margin-top: 1.5rem; } .mt-2 { margin-top: 2rem; }
.small { font-size: 0.875rem; color: var(--ink-3); }
.label { font-size: 0.875rem; font-weight: 500; color: var(--ink-3); margin: 0 0 0.5rem; }
.mono { font-family: var(--mono); }
.lede { font-size: 1.1875rem; color: var(--ink-2); }
.note { display: block; padding: 0.875rem 1rem; border-left: 2px solid var(--teal); background: var(--teal-soft); color: var(--ink); border-radius: 0 4px 4px 0; font-size: 0.9375rem; }
.disclosure { font-size: 0.9375rem; color: var(--ink-2); }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; min-height: 3rem; padding: 0.75rem 1.25rem; border-radius: 6px; background: var(--teal); color: var(--paper); font-weight: 600; font-size: 1rem; text-decoration: none; border: 0; cursor: pointer; font-family: inherit; transition: background 0.15s; }
.btn:hover, .btn:focus-visible { background: var(--teal-hover); color: var(--paper); }
.btn.secondary { background: transparent; color: var(--ink); border: 1px solid var(--line-strong); }
.btn.secondary:hover, .btn.secondary:focus-visible { background: var(--paper-2); color: var(--ink); border-color: var(--ink); }
.link { display: inline-flex; align-items: center; gap: 0.35rem; min-height: 2.75rem; font-weight: 600; font-size: 1rem; text-decoration: none; }
.link:hover { text-decoration: underline; }
.ext { width: 0.85em; height: 0.85em; flex: none; }
.actions { display: flex; flex-wrap: wrap; gap: 0.75rem 1.25rem; align-items: center; margin-top: 1.5rem; }
.skip { position: absolute; left: -999px; top: 0.5rem; background: var(--ink); color: var(--paper); padding: 0.5rem 0.75rem; border-radius: 4px; z-index: 100; }
.skip:focus { left: 0.5rem; }

/* Header */
header.site { position: sticky; top: 0; z-index: 50; background: var(--paper); border-bottom: 1px solid var(--line); }
header.site > .wrap { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 4.5rem; }
.brand { display: inline-flex; align-items: center; gap: 0.6rem; min-width: 0; font-size: 1.25rem; font-weight: 600; color: var(--ink); text-decoration: none; }
.brand svg { width: 1.75rem; height: 1.75rem; flex: none; }
.brand small { display: block; font-size: 0.8125rem; font-weight: 500; color: var(--ink-3); }
nav.primary { display: none; align-items: center; gap: 1.5rem; }
nav.primary a:not(.btn) { font-size: 1rem; font-weight: 500; color: var(--ink-2); text-decoration: none; padding: 0.5rem 0; }
nav.primary a:not(.btn):hover, nav.primary a:not(.btn)[aria-current="page"] { color: var(--ink); text-decoration: underline; text-decoration-color: var(--teal); text-decoration-thickness: 2px; text-underline-offset: 8px; }
nav.primary a.btn, nav.primary a.btn:hover, nav.primary a.btn:focus-visible { color: var(--paper); }
.menu-btn { display: inline-flex; align-items: center; justify-content: center; min-width: 3rem; min-height: 3rem; flex: none; background: none; border: 1px solid var(--line-strong); border-radius: 6px; font: inherit; font-size: 1rem; font-weight: 500; color: var(--ink); cursor: pointer; }
nav.mobile { display: none; border-top: 1px solid var(--line); background: var(--paper); }
nav.mobile.open { display: block; }
nav.mobile .wrap { display: block; padding-top: 0.5rem; padding-bottom: 0.75rem; }
nav.mobile a { display: flex; align-items: center; min-height: 3rem; width: 100%; padding: 0.5rem 0; border-bottom: 1px solid var(--line); font-size: 1.125rem; font-weight: 500; color: var(--ink-2); text-decoration: none; }
nav.mobile a.btn { justify-content: center; margin-top: 0.75rem; border-bottom: 0; color: var(--paper); }
@media (min-width: 1024px) { nav.primary { display: flex; } .menu-btn, nav.mobile { display: none !important; } }

/* Sections */
section { padding-top: var(--sec); padding-bottom: var(--sec); }
section + section { border-top: 1px solid var(--line); }
section.tint { background: var(--paper-2); }
.sec-head { margin-bottom: 1.5rem; }
.sec-head p { margin-top: 0.75rem; }
.sec-head.row { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 0.25rem 1.5rem; }
.intro { padding-top: clamp(2.5rem, 2rem + 2vw, 4rem); }
.intro h1 { margin: 0.5rem 0 1rem; max-width: 18ch; }
.steps { counter-reset: s; display: grid; gap: 1rem; grid-template-columns: minmax(0, 1fr); margin: 0; padding: 0; list-style: none; }
@media (min-width: 768px) { .steps { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.steps li { counter-increment: s; padding-left: 2.5rem; position: relative; font-size: 1rem; }
.steps li::before { content: counter(s); position: absolute; left: 0; top: 0; width: 1.75rem; height: 1.75rem; border-radius: 50%; border: 1px solid var(--line-strong); display: flex; align-items: center; justify-content: center; font-family: var(--mono); font-size: 0.875rem; color: var(--ink); background: var(--card); }

/* Cards */
.cards { display: grid; gap: var(--gap); grid-template-columns: minmax(0, 1fr); }
@media (min-width: 768px) { .cards { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1024px) { .cards { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 1.5rem; display: flex; flex-direction: column; gap: 0.75rem; }
.card.start { border-color: var(--teal); }
.card .kicker { font-size: 0.875rem; font-weight: 600; color: var(--teal); margin: 0; }
.card p, .card dd { font-size: 1rem; }
.card dl { margin: 0; display: grid; gap: 0.5rem; }
.card dt { font-size: 0.875rem; font-weight: 500; color: var(--ink-3); }
.card dd { margin: 0; }
.card .ask { background: var(--teal-soft); color: var(--ink); border-radius: 6px; padding: 0.625rem 0.875rem; font-weight: 500; }
.call { margin-top: auto; padding-top: 0.75rem; border-top: 1px solid var(--line); display: grid; gap: 0.5rem; }
.call .btn { width: 100%; font-family: var(--mono); font-size: 1.125rem; letter-spacing: 0.02em; }
.call .copy { display: inline-flex; align-items: center; min-height: 2.75rem; padding: 0; border: 0; background: none; font: inherit; font-size: 0.9375rem; font-weight: 500; color: var(--teal); cursor: pointer; }
.call .copy:hover { text-decoration: underline; }
details { border-top: 1px solid var(--line); padding-top: 0.5rem; }
summary { cursor: pointer; font-weight: 500; color: var(--teal); min-height: 2.75rem; display: flex; align-items: center; }
.turns { margin: 0.5rem 0 0; padding: 0; list-style: none; display: grid; gap: 0.35rem; font-size: 0.9375rem; }
.turns li span { font-family: var(--mono); font-size: 0.75rem; color: var(--ink-3); margin-right: 0.5rem; text-transform: uppercase; }

/* Three-up text blocks */
.cols { display: grid; gap: var(--gap); grid-template-columns: minmax(0, 1fr); }
@media (min-width: 768px) { .cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); } .cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.block h3 { margin-bottom: 0.5rem; }
.block h3 a { display: inline-block; padding: 0.25rem 0; text-decoration: none; }
.block h3 a:hover { text-decoration: underline; }
.block p { font-size: 1rem; }
.status { display: inline-block; font-size: 0.8125rem; line-height: 1.5; font-weight: 600; padding: 0.1rem 0.5rem; border-radius: 4px; vertical-align: middle; letter-spacing: 0; }
.block .status { margin-bottom: 0.5rem; }
h2 .status { margin-left: 0.5rem; position: relative; top: -0.15em; }
.status.live { background: var(--teal-soft); color: var(--teal-hover); }
.status.sim { background: #FBF1DD; color: #7A4F00; }

/* Architecture */
.arch { display: grid; gap: 1rem; grid-template-columns: minmax(0, 1fr); margin: 1.5rem 0 0; padding: 0; list-style: none; }
@media (min-width: 900px) { .arch { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.arch > li { background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 1.25rem; }
.arch h3 { font-size: 1.0625rem; margin-bottom: 0.5rem; }
.arch ul { margin: 0; padding-left: 1.1rem; font-size: 0.9375rem; }
.arch li li { margin: 0.25rem 0; }
.arch .flow { display: block; margin-top: 0.75rem; font-size: 0.875rem; color: var(--ink-3); }

/* Tables */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; margin-top: 1rem; }
table { border-collapse: collapse; width: 100%; font-size: 0.9375rem; }
th, td { text-align: left; vertical-align: top; padding: 0.75rem 1rem 0.75rem 0; border-bottom: 1px solid var(--line); }
th { font-weight: 600; color: var(--ink); font-size: 0.875rem; }
th:first-child, td:first-child { width: 11rem; min-width: 9rem; }
td { color: var(--ink-2); }
td.mono, .fields code { font-family: var(--mono); font-size: 0.875rem; color: var(--ink); }
.fields { display: grid; gap: 0.75rem; margin: 1rem 0 0; }
.fields > div { padding: 1rem 1.25rem; background: var(--card); border: 1px solid var(--line); border-radius: 8px; }
.fields code { background: var(--paper-2); padding: 0.05rem 0.35rem; border-radius: 3px; display: inline-block; margin: 0.15rem 0.25rem 0.15rem 0; }

/* Trace */
.trace { margin: 1rem 0 0; padding: 0; list-style: none; display: grid; gap: 0; border-top: 1px solid var(--line); }
.trace > div { display: grid; gap: 0.25rem; padding: 0.875rem 0; border-bottom: 1px solid var(--line); font-size: 0.9375rem; }
@media (min-width: 640px) { .trace > div { grid-template-columns: minmax(0, 11rem) minmax(0, 1fr); gap: 1.5rem; } }
.trace dt { font-weight: 600; color: var(--ink); }
.trace dd { margin: 0; }

/* Article */
.article { max-width: 65ch; }
.article h2 { margin-top: 2.5rem; margin-bottom: 0.75rem; }
.article h3 { margin-top: 1.5rem; margin-bottom: 0.5rem; }
.article p + p { margin-top: 1rem; }
.article ul, .article ol { padding-left: 1.25rem; margin: 0.75rem 0 0; }
.article li { margin: 0.4rem 0; }
.crumbs { font-size: 0.875rem; font-weight: 500; margin-bottom: 1rem; }
.crumbs a { text-decoration: none; display: inline-block; padding: 0.6rem 0; }

/* Contact */
.contact .wrap { display: grid; gap: 2rem; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 768px) { .contact .wrap { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: start; } }
.contact dl { margin: 0; display: grid; gap: 0.25rem; }
.contact dt { font-size: 0.875rem; font-weight: 500; color: var(--ink-3); margin-top: 0.75rem; }
.contact dd { margin: 0; font-size: 1.125rem; }
.contact dd a { color: var(--ink); text-decoration: none; display: inline-block; max-width: 100%; padding: 0.6rem 0; }
.contact dd a:hover { color: var(--teal); text-decoration: underline; }

/* Footer */
footer { border-top: 1px solid var(--line); padding: 2.5rem 0; font-size: 0.875rem; color: var(--ink-3); }
footer .wrap { display: grid; gap: 1rem 2rem; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 768px) { footer .wrap { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } }
footer a { color: var(--ink-2); text-decoration: none; display: inline-block; max-width: 100%; padding: 0.5rem 0; }
footer a:hover { color: var(--teal); text-decoration: underline; }
footer p { max-width: 52ch; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }