/* Aether public site: shared styles for index, research, principles, about and evidence (rebuilt 2026-11-08).
   Tokens and type come from the previous homepage; light and dark follow the reader's system setting. */
:root {
  --paper: #eef1f4;
  --paper-2: #e2e7ee;
  --card: #f8f9fb;
  --ink: #18203a;
  --ink-2: #4a5470;
  --rule: #c3cad7;
  --brass: #85621f;
  --celest: #2f4f9a;
  --orbit: #8c97b2;
  --serif: "Newsreader", "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: "Instrument Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  --max: 1160px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0f1428;
    --paper-2: #161d36;
    --card: #131a31;
    --ink: #e6e9f2;
    --ink-2: #a3abc2;
    --rule: #2b3456;
    --brass: #d6b26a;
    --celest: #93b2ff;
    --orbit: #4f5b80;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { margin: 0; color: var(--ink); background: var(--paper); font: 400 1.0625rem/1.65 var(--sans); }
a { color: var(--celest); text-underline-offset: .2em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--brass); outline-offset: 3px; border-radius: 2px; }
.wrap { width: min(calc(100% - 2rem), var(--max)); margin-inline: auto; }
.skip { position: absolute; left: 1rem; top: -4rem; z-index: 20; padding: .6rem .9rem; color: var(--paper); background: var(--ink); }
.skip:focus { top: 1rem; }
img { max-width: 100%; }

/* Header */
header.site { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--paper) 92%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--rule); }
header.site nav { display: flex; align-items: center; justify-content: space-between; gap: 1rem 1.5rem; min-height: 64px; }
.brand { display: inline-flex; align-items: baseline; gap: .5rem; color: var(--ink); text-decoration: none; font: 500 1.55rem/1 var(--serif); }
.brand span { color: var(--brass); font-size: 1.15rem; }
header.site ul { display: flex; flex-wrap: wrap; align-items: center; gap: .3rem 1.3rem; margin: 0; padding: 0; list-style: none; }
header.site ul a { color: var(--ink-2); text-decoration: none; font-size: .95rem; }
header.site ul a:hover { color: var(--ink); text-decoration: underline; }
header.site ul a.pill { padding: .35rem .9rem; border-radius: 999px; color: var(--paper); background: var(--ink); font-weight: 600; }
header.site ul a.pill:hover { background: var(--celest); text-decoration: none; }

/* Type */
h1, h2 { font-family: var(--serif); font-weight: 400; letter-spacing: -.012em; margin: 0; }
h1 { font-size: clamp(2.6rem, 6vw, 4.8rem); line-height: 1.02; max-width: 14ch; }
h2 { font-size: clamp(1.8rem, 3.3vw, 2.7rem); line-height: 1.12; max-width: 24ch; }
h3 { margin: 0 0 .35rem; font: 600 1.02rem/1.35 var(--sans); }
p { margin: 0; }
.kicker { margin-bottom: .8rem; color: var(--brass); font: 600 .82rem/1.2 var(--sans); letter-spacing: .08em; text-transform: uppercase; }
.kicker a { color: inherit; }
.lead { margin-top: 1.4rem; max-width: 34em; color: var(--ink-2); font-size: clamp(1.1rem, 1.7vw, 1.28rem); line-height: 1.55; }
.intro { margin-top: 1.1rem; max-width: 40em; color: var(--ink-2); }
.muted { color: var(--ink-2); }
.punch { margin-top: 2.2rem; max-width: 36em; padding-left: 1rem; border-left: 2px solid var(--brass); font: italic 400 clamp(1.2rem, 2vw, 1.45rem)/1.45 var(--serif); }
.byline { margin-top: 1.4rem; color: var(--ink-2); font: italic 400 1.05rem/1.4 var(--serif); }
.note { margin-top: 1.4rem; color: var(--ink-2); font: italic 400 1rem/1.5 var(--serif); }

/* Sections */
section { padding: clamp(3.5rem, 7vw, 6rem) 0; border-top: 1px solid var(--rule); }
section[id] { scroll-margin-top: 76px; }
section.alt { background: var(--paper-2); }

/* Buttons */
.actions { display: flex; flex-wrap: wrap; gap: .75rem 1.25rem; align-items: center; margin-top: 2rem; }
.button { display: inline-flex; align-items: center; min-height: 46px; padding: .65rem 1.25rem; border-radius: 999px; color: var(--paper); background: var(--ink); font-weight: 600; text-decoration: none; }
.button:hover { background: var(--celest); }
.button.ghost { color: var(--ink); background: transparent; border: 1px solid var(--ink); }
.button.ghost:hover { color: var(--paper); background: var(--ink); }

/* Hero */
.hero { border-top: 0; padding: clamp(3rem, 7vw, 5.5rem) 0 clamp(3rem, 6vw, 4.5rem); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: 3rem; align-items: center; }
.flow svg { display: block; width: 100%; height: auto; }
.flow figcaption { margin-top: .8rem; color: var(--ink-2); font: italic 400 1rem/1.5 var(--serif); text-align: center; }
.d-box { fill: var(--card); stroke: var(--rule); stroke-width: 1.2; }
.d-box.you { fill: var(--ink); stroke: var(--ink); }
.d-box.key { stroke: var(--brass); stroke-width: 1.6; }
.d-label { fill: var(--ink); font: 600 15px var(--sans); }
.d-label.you { fill: var(--paper); }
.d-sub { fill: var(--ink-2); font: 400 12.5px var(--sans); }
.d-line { fill: none; stroke: var(--orbit); stroke-width: 1.6; }
.d-line.back { stroke: var(--brass); stroke-dasharray: 4 5; }
.d-head { fill: var(--orbit); }
.d-head.back { fill: var(--brass); }

/* Primer staircase */
.stairs { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1.2rem; align-items: end; margin: 2.8rem 0 0; padding: 0; list-style: none; counter-reset: st; }
.stairs li { counter-increment: st; display: flex; flex-direction: column; gap: .5rem; padding: 1.3rem 1.2rem 1.4rem; background: var(--card); border: 1px solid var(--rule); border-top: 3px solid var(--celest); border-radius: 6px; }
.stairs li:nth-child(1) { min-height: 15rem; }
.stairs li:nth-child(2) { min-height: 17rem; }
.stairs li:nth-child(3) { min-height: 19rem; }
.stairs li:nth-child(4) { min-height: 21rem; border-top-color: var(--brass); }
.stairs li::before { content: counter(st); color: var(--brass); font: 400 2rem/1 var(--serif); }
.stairs h3 { font: 500 1.35rem/1.2 var(--serif); margin: 0; }
.stairs p { color: var(--ink-2); font-size: .97rem; }
.stairs .like { margin-top: auto; padding-top: .6rem; border-top: 1px solid var(--rule); font: italic 400 .98rem/1.45 var(--serif); color: var(--ink); }

/* Benefit list */
.benefits { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 2rem 2.5rem; margin: 2.8rem 0 0; padding: 0; list-style: none; }
.benefits li { padding-top: 1rem; border-top: 1px solid var(--ink); }
.benefits p { color: var(--ink-2); }

/* Advantage cards */
.adv { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.2rem; margin: 2.8rem 0 0; padding: 0; list-style: none; }
.adv li { display: flex; flex-direction: column; gap: .5rem; padding: 1.4rem 1.3rem; background: var(--card); border: 1px solid var(--rule); border-radius: 6px; }
.adv h3 { font: 500 1.3rem/1.2 var(--serif); margin: 0; }
.adv p { color: var(--ink-2); font-size: .97rem; }
.adv .proof { margin-top: auto; padding-top: .7rem; border-top: 1px solid var(--rule); color: var(--ink); font-size: .9rem; }
.adv .proof b { color: var(--brass); font-weight: 600; }
.open { margin-top: 2rem; font: 500 1.15rem/1.4 var(--serif); }

/* Screenshots */
.shot { margin: 0; }
.shot .frame { position: relative; display: grid; place-items: center; aspect-ratio: 16 / 10; overflow: hidden; background: var(--card); border: 1px solid var(--rule); border-radius: 8px; box-shadow: 0 18px 40px -24px rgba(15, 20, 40, .45); }
.shot .frame::before { content: attr(data-placeholder); padding: 1.5rem; color: var(--ink-2); font: italic 400 1rem/1.4 var(--serif); text-align: center; }
.shot .frame img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: top left; }
.shot figcaption { margin-top: .7rem; color: var(--ink-2); font-size: .93rem; }
.shot.tall .frame { aspect-ratio: 575 / 888; max-width: 380px; margin-inline: auto; }
/* Once a screenshot is present, the frame takes the image's own shape. */
.shot .frame:has(img) { display: block; aspect-ratio: auto; }
.shot .frame:has(img)::before { content: none; }
.shot .frame:has(img) img { position: static; display: block; width: 100%; height: auto; }
.feature { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr); gap: 2.5rem; align-items: center; margin-top: 3rem; }
.feature.flip { grid-template-columns: minmax(0, .75fr) minmax(0, 1.25fr); }
.feature.flip .shot { order: 2; }
.feature h3 { font: 500 1.5rem/1.2 var(--serif); margin-bottom: .6rem; }
.feature p { color: var(--ink-2); }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 1.4rem; margin: 2.8rem 0 0; padding: 0; list-style: none; counter-reset: s; }
.steps li { counter-increment: s; padding-top: .9rem; border-top: 2px solid var(--ink); }
.steps li.decide { border-top-color: var(--brass); }
.steps li::before { content: counter(s); display: block; margin-bottom: .4rem; color: var(--brass); font: 400 1.5rem/1 var(--serif); }
.steps p { color: var(--ink-2); font-size: .95rem; }
.steps .you { display: inline-block; margin-left: .35rem; color: var(--brass); font-size: .78rem; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; }

/* Use cases and status */
.cols { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 2rem 2.5rem; margin: 2.6rem 0 0; padding: 0; list-style: none; }
.cols li { padding-top: 1rem; border-top: 1px solid var(--rule); }
.cols p { color: var(--ink-2); }
.status-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.2rem; margin-top: 2.6rem; }
.status-grid div { padding: 1.3rem; background: var(--card); border: 1px solid var(--rule); border-radius: 6px; }
.status-grid h3 { font: 500 1.25rem/1.2 var(--serif); }
.status-grid p { color: var(--ink-2); font-size: .97rem; }

/* Tech: architecture and points */
.tech { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 3rem; align-items: start; margin-top: 2.8rem; }
.arch svg { display: block; width: 100%; height: auto; }
.points { margin: 0; padding: 0; list-style: none; }
.points li { padding: .85rem 0; border-bottom: 1px solid var(--rule); color: var(--ink-2); }
.points li:first-child { border-top: 1px solid var(--rule); }
.points strong { color: var(--ink); }

/* Comparison */
.vs { margin: 2.8rem 0 0; padding: 0; list-style: none; border-top: 1px solid var(--ink); }
.vs li { display: grid; grid-template-columns: 9rem minmax(0, 1fr) minmax(0, 1.2fr); gap: .4rem 2rem; padding: 1rem 0; border-bottom: 1px solid var(--rule); }
.vs .vs-head { padding: .7rem 0; color: var(--ink-2); font-size: .8rem; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; }
.vs h3 { font: 500 1.15rem/1.3 var(--serif); }
.vs .them { color: var(--ink-2); }
.vs .us { padding-left: 1rem; border-left: 2px solid var(--brass); }
.vs .tag { display: none; margin-bottom: .15rem; color: var(--ink-2); font-size: .76rem; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; }

/* Evidence table */
.table-wrap { margin-top: 2.6rem; overflow-x: auto; border: 1px solid var(--rule); border-radius: 6px; background: var(--card); }
table.evidence { width: 100%; min-width: 760px; border-collapse: collapse; font-size: .93rem; }
table.evidence th, table.evidence td { padding: .7rem .9rem; text-align: left; vertical-align: top; border-bottom: 1px solid var(--rule); }
table.evidence th { color: var(--ink-2); font-size: .78rem; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; background: var(--paper-2); }
table.evidence td:first-child { font-weight: 600; }
table.evidence td.lim { color: var(--ink-2); }
table.evidence td:nth-child(3), table.evidence td:nth-child(4) { white-space: nowrap; }
table.evidence tr.pending td { color: var(--ink-2); font-style: italic; }

/* Get started */
.get { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr); gap: 3rem; margin-top: 2.6rem; align-items: start; }
.get ol { margin: 0; padding-left: 1.3rem; }
.get ol li { margin-bottom: .8rem; }
.get .aside { padding: 1.4rem; background: var(--card); border: 1px solid var(--rule); border-left: 3px solid var(--brass); border-radius: 6px; }
.get .aside p + p { margin-top: .8rem; }
code { padding: .05rem .3rem; font-size: .92em; background: var(--paper-2); border-radius: 3px; }

/* Subpages */
.page-head { border-top: 0; padding-bottom: 1.5rem; }
.page-head + section { border-top: 1px solid var(--rule); }

/* Reused blocks from the previous homepage (principles, research, evidence log, team) */
.principles { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2.4rem 3rem; margin: 3rem 0 0; padding: 0; list-style: none; counter-reset: p; }
.principles li { display: grid; grid-template-columns: 3rem minmax(0, 1fr); gap: 0 1rem; counter-increment: p; }
.principles li::before { content: counter(p); grid-row: span 2; color: var(--brass); font: 400 2.6rem/1 var(--serif); }
.principles h3 { font: 500 1.3rem/1.25 var(--serif); margin-bottom: .4rem; }
.principles p { color: var(--ink-2); }
.principles li:last-child { grid-column: 1 / -1; max-width: 46em; }
.folio { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 3fr); gap: 1.5rem 4rem; }
.folio > .main { min-width: 0; }
.margin { display: grid; align-content: start; gap: 1.6rem; padding-top: .5rem; }
.annot { padding-left: 1rem; border-left: 1px solid var(--brass); color: var(--ink-2); font: italic 400 1.02rem/1.5 var(--serif); }
.annot b { display: block; margin-bottom: .2rem; color: var(--brass); font: 500 normal .95rem/1.3 var(--serif); }
.ledger { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 3rem; margin-top: 3rem; }
.ledger h3 { margin-bottom: 1rem; padding-bottom: .6rem; border-bottom: 1px solid var(--ink); font: 400 1.4rem/1.2 var(--serif); }
.ledger ul { margin: 0; padding: 0; list-style: none; }
.ledger li { position: relative; padding: .55rem 0 .55rem 1.4rem; color: var(--ink-2); border-bottom: 1px solid var(--rule); }
.ledger li::before { content: ""; position: absolute; left: 0; top: 1.15rem; width: .5rem; height: .5rem; border-radius: 50%; background: var(--celest); }
.ledger .ahead li::before { background: transparent; border: 1.5px solid var(--brass); }
.ledger li strong { color: var(--ink); font-weight: 600; }
.history { margin-top: 2.5rem; padding-top: 1.2rem; border-top: 1px solid var(--rule); }
.history summary { cursor: pointer; color: var(--celest); font-weight: 600; }
.history > ul { padding-left: 1.3rem; color: var(--ink-2); }
.history > ul li { margin-top: 1rem; }
.history strong { color: var(--ink); }
.roster { margin: 2.6rem 0 0; padding: 0; list-style: none; border-top: 1px solid var(--ink); }
.roster li { display: grid; grid-template-columns: 9rem 8rem minmax(0, 1fr); gap: .3rem 1.5rem; align-items: baseline; padding: 1rem 0; border-bottom: 1px solid var(--rule); }
.roster .name { font: 400 1.5rem/1.1 var(--serif); }
.roster .role { color: var(--brass); font: italic 400 1rem/1.3 var(--serif); }
.roster p { color: var(--ink-2); }
.pair { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2rem 3rem; margin-top: 2.6rem; }
.pair p { color: var(--ink-2); }
.spectrum { position: relative; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 2rem; margin-top: 3rem; padding-top: 2rem; }
.spectrum::before { content: ""; position: absolute; left: 0; right: 0; top: .45rem; height: 2px; background: linear-gradient(90deg, var(--brass), var(--celest), var(--orbit)); }
.spectrum article { position: relative; }
.spectrum article::before { content: ""; position: absolute; top: -1.85rem; left: 0; width: .8rem; height: .8rem; border-radius: 50%; background: var(--paper); border: 2px solid var(--ink); }
.spectrum .pole { display: block; margin-bottom: .3rem; color: var(--brass); font: italic 400 1rem/1.3 var(--serif); }
.spectrum p { color: var(--ink-2); }
.index { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 3rem; margin: 3rem 0 0; padding: 0; list-style: none; }
.index li { padding: 1rem 0; border-top: 1px solid var(--rule); }
.index p { color: var(--ink-2); font-size: .97rem; }
.index .links { display: flex; flex-wrap: wrap; gap: .2rem 1.2rem; margin-top: .4rem; font-weight: 500; }
.founder { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 6fr); gap: 3rem; align-items: start; }
.founder .who { color: var(--ink-2); margin-bottom: .6rem; }
.quote { margin: 0; font: italic 400 clamp(1.45rem, 2.8vw, 2.1rem)/1.35 var(--serif); }
.founder .button { margin-top: 1.6rem; }

/* Footer */
footer.site { padding: 2.5rem 0 3rem; border-top: 1px solid var(--rule); color: var(--ink-2); font-size: .95rem; }
.footer-row { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .8rem 2rem; }
.footer-row ul { display: flex; flex-wrap: wrap; gap: .3rem 1.3rem; margin: 0; padding: 0; list-style: none; }

@media (max-width: 960px) {
  .hero-grid, .tech, .get, .feature, .feature.flip, .founder, .folio { grid-template-columns: 1fr; }
  .feature.flip .shot { order: 0; }
  .stairs { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stairs li:nth-child(n) { min-height: 0; }
  .benefits, .adv, .cols, .status-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .steps { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .margin { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); padding-top: 1.5rem; }
}
@media (max-width: 680px) {
  header.site { position: static; }
  header.site nav { flex-direction: column; align-items: flex-start; gap: .5rem; padding: .8rem 0; }
  header.site ul { gap: .2rem 1rem; }
  section[id] { scroll-margin-top: 12px; }
  .stairs, .benefits, .adv, .cols, .status-grid, .principles, .ledger, .pair, .index, .spectrum { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .vs li { grid-template-columns: 1fr; gap: .6rem; }
  .vs .vs-head { display: none; }
  .vs .tag { display: block; }
  .roster li { grid-template-columns: 1fr; }
  .spectrum { padding-top: 0; padding-left: 1.6rem; gap: 1.6rem; }
  .spectrum::before { left: .35rem; right: auto; top: 0; bottom: 0; width: 2px; height: auto; background: linear-gradient(180deg, var(--brass), var(--celest), var(--orbit)); }
  .spectrum article::before { top: .35rem; left: -1.6rem; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }