/* ==========================================================================
   CTAO Science Portal — design tokens per the official CTAO Brand Guidelines
   (April 2024): colors D.2, typography D.3 (Inter body / Space Grotesk display
   at medium weight per D.3.4), flash D.4. All look-and-feel lives in the tokens
   below; WCAG 2.1 AA contrast (photo-hero worst cases computed — see DESIGN.md).
   Light theme only (brand is light-first; navy bands carry the dark identity).
   System rules (spacing / elevation / surfaces / motion): see DESIGN.md.
   ========================================================================== */
:root {
  color-scheme: light;
  /* Brand palette — hex values straight from the brand book */
  --galaxy: #00004a;        /* Galaxy Blue — headings, header/footer bands */
  --cherenkov: #00e4d8;     /* Cherenkov Blue — primary CTA, flash, hero subtitle, logo cluster ONLY */
  --moon: #f5f5f5;          /* Moon Gray — surfaces */
  --azure: #007aff;         /* Cosmic Azure — focus rings (UI only on light) */
  --indigo: #00009c;        /* Interestellar Indigo — gradient depth */
  /* Derived, WCAG-adjusted */
  --text: #101228;          /* near-Galaxy body ink */
  --muted: #46536a;
  --border: #e2e5ee;
  --link: #0057c2;          /* Cosmic Azure darkened to pass AA (4.5:1) for body links */
  --on-galaxy-muted: #c7cde9;
  --tint-cherenkov: color-mix(in srgb, var(--cherenkov) 16%, transparent); /* <mark> highlight only */
  --cherenkov-hover: color-mix(in oklab, var(--cherenkov), var(--galaxy) 12%); /* CTA hover state */
  --ico-ext: url('data:image/svg+xml,%3Csvg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"%3E%3Cpath d="M7 17 17 7M9 7h8v8" fill="none" stroke="black" stroke-width="2.5"/%3E%3C/svg%3E');
  /* Type — fonts (BRAND D.3.1/D.3.2) and the ONLY font sizes in this codebase */
  --font-body: "Inter", "Inter Fallback", Arial, system-ui, sans-serif;
  --font-display: "Space Grotesk", var(--font-body);                      /* headlines only */
  --fs-xs: 0.8125rem;                            /* chips, meta, badges, labels */
  --fs-s: 0.9rem;                                /* secondary text, nav, forms, footer */
  --fs-l: 1.125rem;                              /* card titles, standfirst, panel titles */
  --fs-xl: 1.5rem;                               /* prose h2, featured title, auth h1 */
  --fs-h2: clamp(1.75rem, 3.5vw, 2.5rem);        /* section heads */
  --fs-h1: clamp(2.25rem, 5vw, 3.5rem);          /* page/article headlines */
  --fs-display: clamp(2.5rem, 7vw, 4.75rem);     /* home hero only */
  /* ctao.org uses generous rounding (15/30/60px tokens) and pill buttons */
  --radius: 16px;
  --radius-pill: 999px;
  --maxw: 1120px;
  /* Fluid spacing scale (Apple-scale rhythm: sections breathe, mobile stays compact).
     Every section / container / card padding sits on this scale — no ad-hoc values. */
  --gutter: clamp(18px, 4vw, 28px);              /* page side padding */
  --space-s: 12px;
  --space-m: 24px;
  --space-l: clamp(24px, 2vw + 16px, 40px);
  --space-xl: clamp(56px, 7vw, 120px);           /* section rhythm */
  --space-band: clamp(72px, 10vw, 160px);        /* hero / auth / landing-head padding */
  /* Elevation — navy-tinted, soft/large/low-alpha; the ONLY two shadows allowed */
  --shadow-ambient: 0 1px 2px rgba(0, 0, 74, 0.04), 0 8px 24px rgba(0, 0, 74, 0.06);
  --shadow-lifted: 0 2px 6px rgba(0, 0, 74, 0.05), 0 24px 48px rgba(0, 0, 74, 0.14);
  /* Motion — ONE hover language everywhere (ctao.org: quiet .25s fades) */
  --dur: 0.25s;
  --ease: ease-out;
  /* Nebula glow (BRAND D.5) — auth band, static AND animated. Alphas are
     contrast ceilings (DESIGN.md): Cherenkov ≤.38 / Azure ≤.35; cores sit in
     opposite corners — cores never meet. */
  --nebula:
    radial-gradient(52% 58% at 78% 76%, rgba(0, 228, 216, 0.38), transparent 66%),
    radial-gradient(46% 52% at 12% 18%, rgba(0, 122, 255, 0.33), transparent 64%),
    radial-gradient(75% 85% at 40% 55%, rgba(0, 0, 156, 0.8), transparent 72%);
  /* Photo-hero variant: no indigo depth blob over photography, Cherenkov ≤.30
     with its core pinned ≥80% band width (only ~.15 fringe reaches text). */
  --nebula-glow:
    radial-gradient(52% 58% at 82% 80%, rgba(0, 228, 216, 0.3), transparent 66%),
    radial-gradient(46% 52% at 10% 15%, rgba(0, 122, 255, 0.28), transparent 64%);
  /* Hero scrim over the photo — worst-case AA computed in DESIGN.md:
     small text lives left of 52% band width (α ≥ .76 there). */
  --hero-scrim: linear-gradient(to right,
    rgba(0, 0, 74, 0.84), rgba(0, 0, 74, 0.76) 52%,
    rgba(0, 0, 74, 0.44) 78%, rgba(0, 0, 74, 0.26));
}
/* ≤640px the hero text spans the full width — flat scrim, computed ≥5.28:1 */
@media (max-width: 640px) {
  :root { --hero-scrim: linear-gradient(rgba(0, 0, 74, 0.8), rgba(0, 0, 74, 0.8)); }
}

/* Self-hosted brand fonts — latin subset, variable weight, swap + metric-matched fallback */
@font-face {
  font-family: "Inter"; font-weight: 400 700; font-display: swap;
  src: url("/fonts/inter-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "Space Grotesk"; font-weight: 500 700; font-display: swap;
  src: url("/fonts/space-grotesk-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "Inter Fallback"; src: local("Arial");
  size-adjust: 107%; ascent-override: 90.2%; descent-override: 22.48%; line-gap-override: 0%;
}

/* Screen-reader-only utility (visually hidden, still announced) */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 76px; /* sticky header + anchor jumps */ }
/* Guard, not a solution (DESIGN.md): every wide element is contained at its own
   level (tables scroll in their box, long words wrap); clip only catches
   regressions so one offender can never remove the page gutters. `clip`, unlike
   `hidden`, creates no scroll container — sticky header keeps working. */
html, body { overflow-x: clip; }
body {
  margin: 0;
  font-family: var(--font-body);
  background: #fff;
  color: var(--text);
  line-height: 1.5;
  min-height: 100dvh;
}

/* Display type: Space Grotesk at medium weight (BRAND D.3.4 — regular/medium),
   tight tracking at display sizes, compact leading. Hierarchy comes from size. */
h1, h2 { font-family: var(--font-display); font-weight: 500; letter-spacing: -0.025em; line-height: 1.1; }
h3 { font-weight: 600; }
h1, h2, h3, .hero p { text-wrap: balance; }
/* Overlong unbroken words (slugs, codes) may break rather than overflow the page */
h1, h2, h3 { overflow-wrap: break-word; }
.prose p, .desc { text-wrap: pretty; }

/* Inline SVG icons — stroke inherits currentColor */
.ico { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; flex: none; }

/* All <summary> disclosures (menu, search, TOC) share the plain-button look */
summary { cursor: pointer; list-style: none; }
summary::-webkit-details-marker { display: none; }

a { color: var(--link); text-decoration: underline; text-underline-offset: 3px; }
a:hover { color: var(--indigo); }
/* Placeholder links (<a> without href) don't pretend to be clickable */
a:not([href]) { text-decoration: none; cursor: default; }
img { max-width: 100%; height: auto; display: block; }

/* Visible keyboard focus everywhere (WCAG 2.4.7) */
:focus-visible { outline: 2px solid var(--azure); outline-offset: 2px; }

/* Skip link — first tab stop, hidden until focused (WCAG 2.4.1) */
.skip {
  position: absolute; left: 16px; top: -52px; z-index: 20;
  background: var(--galaxy); color: #fff; text-decoration: none;
  padding: 10px 16px; border-radius: 0 0 var(--radius) var(--radius);
}
.skip:focus { top: 0; }

/* Safety net: even third-party/UA leftovers never move for reduced-motion users */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); }
/* Surface rhythm: white (editorial + landing heads) → Moon Gray (service/utility
   bands) → Galaxy (home hero, auth, footer) */
.band--moon { background: var(--moon); }

/* Flash — the REAL brand star (BRAND D.4): inline SVG path lifted from the
   official logo, never a CSS approximation. Budget: one accent per view; static. */
.flash { width: 12px; height: 12px; color: var(--cherenkov); flex: none; }


/* Header — Galaxy Blue band, reverse (white) logo per BRAND B.1.2; translucent
   over content where backdrop blur is supported (AA computed: worst underlying
   white → bar (31,31,96), muted nav text 9.4:1). Solid Galaxy fallback. */
.site-header { background: var(--galaxy); position: sticky; top: 0; z-index: 10; }
@supports ((-webkit-backdrop-filter: blur(1px)) or (backdrop-filter: blur(1px))) {
  .site-header {
    background: color-mix(in srgb, var(--galaxy) 88%, transparent);
    -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  }
}
.nav { display: flex; align-items: center; gap: 4px; min-height: 56px; flex-wrap: nowrap; }
.nav > nav { display: flex; align-items: center; gap: 4px; }
/* One-row guarantee: everything keeps its natural size except the spacer
   (links are single words, they can never wrap) */
.nav > * { flex: none; }
/* Header tiers, one row always: ≥1025px full nav · ≤1024px disclosure menu ·
   ≤640px sub-brand hidden · ≤480px icon-only menu, smaller logo · ≤360px compact.
   Search is the same icon-reveal at every width (one pattern, no width math). */
.menu { display: none; }
.menu .i-close { display: none; }
.menu[open] .i-menu { display: none; }
.menu[open] .i-close { display: block; }
.brand { display: flex; align-items: center; gap: 10px; margin-right: 10px; text-decoration: none; }
.brand img { height: 26px; width: auto; }
.brand .brand-sub {
  color: var(--cherenkov); font-size: var(--fs-xs); font-weight: 500;
  border-left: 1px solid rgba(255, 255, 255, 0.25); padding-left: 10px;
}
.nav .spacer { flex: 1; }
.nav a.navlink {
  color: var(--on-galaxy-muted); font-weight: 500; font-size: var(--fs-s);
  padding: 10px 10px; text-decoration: none; border-bottom: 2px solid transparent;
}
.nav a.navlink:hover { color: #fff; }
.nav a.navlink[aria-current="page"] { color: #fff; border-bottom-color: #fff; }
/* AAI sign-in entry — ghost/outline: Cherenkov fill is reserved for the page's
   primary CTA, the header only whispers. */
.nav .login-mock {
  color: #fff; background: transparent; font: inherit; font-weight: 600; font-size: var(--fs-s);
  border: 1px solid rgba(255, 255, 255, 0.55); border-radius: var(--radius-pill);
  padding: 7px 18px; margin-left: 6px; text-decoration: none; white-space: nowrap;
}
.nav .login-mock:hover { background: rgba(255, 255, 255, 0.12); color: #fff; border-color: #fff; }
/* Tap targets ≥44px (WCAG 2.5.5); inline-flex keeps the active bottom border */
.nav a.navlink, .nav .login-mock {
  display: inline-flex; align-items: center; gap: 6px; min-height: 44px;
}
/* Site search. Desktop ≥1025px: VISIBLE quiet field — NN/g magnifying-glass-
   icon research: icon-only search reduces discoverability/usage; a visible
   input is recommended when search is an important task (content-heavy portal,
   spec-required search). Chrome stays whisper-quiet: hairline on navy.
   Flexes 140-200px (only it and the spacer flex — one-row invariant). */
.nav-search { position: relative; display: flex; align-items: center; flex: 0 1 200px; min-width: 140px; margin-left: 6px; }
.nav-search .search-ico { left: 11px; width: 14px; height: 14px; color: rgba(255, 255, 255, 0.7); }
.nav-search input {
  width: 100%; min-width: 0; font: inherit; font-size: var(--fs-s); color: #fff;
  background: rgba(255, 255, 255, 0.08); border: 1px solid rgba(255, 255, 255, 0.45); /* 3.55:1 vs Galaxy — WCAG 1.4.11 */
  border-radius: var(--radius-pill); padding: 7px 14px 7px 32px;
}
.nav-search input::placeholder { color: rgba(255, 255, 255, 0.65); } /* 6.9:1 */
.nav-search input:focus { border-color: #fff; }
/* Autocomplete panel: never narrower than the field, wide enough for a
   typical title in ≤2 lines (Baymard autocomplete; DocSearch ~500px) */
.nav-search .suggest { left: auto; right: 0; width: min(480px, calc(100vw - 2 * var(--gutter))); top: calc(100% + 10px); }
/* ≤1024px replacement: a 44px magnifier <details> reveals a search row under
   the header (NN/g mobile-search pattern) — see the menu media block. */
.search-pop { display: none; }
.search-pop summary {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 44px; min-height: 44px; color: #fff;
}
.search-pop form {
  position: absolute; left: 0; right: 0; top: 100%;
  display: flex; justify-content: center; gap: 8px; padding: 12px var(--gutter) 16px;
  background: var(--galaxy); border-top: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: var(--shadow-lifted);
}
.search-pop input {
  flex: 0 1 560px; min-width: 0; font: inherit; color: var(--text);
  background: #fff; border: 1px solid transparent; border-radius: var(--radius-pill);
  padding: 10px 16px;
}
.search-pop input:focus { border-color: var(--azure); }
.search-pop .btn { padding: 10px 18px; }
.search-pop .suggest {
  left: max(var(--gutter), 50vw - 330px); right: max(var(--gutter), 50vw - 330px);
  top: calc(100% + 4px);
}
@media (max-width: 1024px) {
  .nav > nav { display: none; }
  .nav-search { display: none; }  /* field is desktop-only (NN/g tiers) */
  .search-pop { display: block; } /* magnifier reveal takes over ≤1024px */
  .menu { display: block; }
  .menu summary {
    display: inline-flex; align-items: center; gap: 8px; min-height: 44px;
    padding: 0 10px; margin-left: 6px; color: #fff; font-weight: 500; white-space: nowrap;
  }
  .menu nav {
    position: absolute; left: 0; right: 0; top: 100%;
    display: flex; flex-direction: column; padding: 6px var(--gutter) 14px;
    background: var(--galaxy); border-top: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow: var(--shadow-lifted);
  }
  .menu nav a {
    display: flex; align-items: center; min-height: 44px;
    color: #fff; font-weight: 500; text-decoration: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  }
  .menu nav a:last-child { border-bottom: 0; }
  .menu nav a[aria-current="page"] { font-weight: 700; }
}
@media (max-width: 640px) { .brand .brand-sub { display: none; } }
@media (max-width: 480px) {
  .brand img { height: 22px; }
  .menu summary .menu-label { display: none; }
  .menu summary { min-width: 44px; justify-content: center; padding: 0; margin-left: 2px; }
}
@media (max-width: 360px) {
  .nav { padding: 0 14px; gap: 2px; }
  .brand { margin-right: 4px; }
  /* logo stays 22px — 22px tall ≈ 105px wide, brand minimum is 100px digital */
  .nav .login-mock { padding: 7px 12px; }
}
/* External-link marker — SVG arrow via mask, inherits currentColor */
.external::after {
  content: ""; display: inline-block; width: 0.72em; height: 0.72em; margin-left: 3px;
  background: currentColor;
  -webkit-mask: var(--ico-ext) center / contain no-repeat;
  mask: var(--ico-ext) center / contain no-repeat;
}

/* Hero (home only) — image-led: LST-1 under the night sky, full-bleed beneath a
   Galaxy scrim (--hero-scrim; worst-case AA computed in DESIGN.md). With motion
   allowed a Cherenkov/Azure glow layer drifts above the photo (see motion block). */
.hero-band {
  background: var(--hero-scrim), url("/brand/hero.jpg") center / cover, var(--galaxy);
  color: #fff; padding: var(--space-band) 0; position: relative;
  /* NO overflow:hidden here — it would clip the search-suggest dropdown.
     The animated glow is clipped by its own .band-bg frame instead. */
}
.band-bg { position: absolute; inset: 0; overflow: hidden; pointer-events: none; }
.hero { position: relative; } /* content above the animated glow layer */
.hero h1 { font-size: var(--fs-display); margin: 0 0 12px; }
.hero p { color: var(--cherenkov); font-size: var(--fs-l); max-width: 62ch; margin: 0; } /* subtitle per BRAND D.3.4 */
.eyebrow {
  color: var(--on-galaxy-muted); font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.14em; font-size: var(--fs-xs); margin-bottom: 8px;
}

/* Hero CTAs — the two core scientist tasks (SPEC §3.1): one Cherenkov primary,
   one quiet ghost. Links styled as buttons because they navigate. */
.hero-cta { display: flex; flex-wrap: wrap; gap: var(--space-s); margin-top: var(--space-l); }
a.btn { display: inline-flex; align-items: center; gap: 6px; text-decoration: none; }
/* Compound selector: outranks the later-defined .btn base (source-order tie
   would otherwise fill the ghost with Cherenkov) */
.btn.btn--ghost { background: transparent; color: #fff; border: 1px solid rgba(255, 255, 255, 0.55); }
.btn.btn--ghost:hover { background: rgba(255, 255, 255, 0.12); color: #fff; border-color: #fff; }

/* Section-landing head (news/search/proposals/dashboard/support) — white page,
   display-scale Galaxy h1 + standfirst; the navy band is reserved for / and /login. */
.page-head { padding-block: var(--space-band) var(--space-l); }
.page-head h1 { color: var(--galaxy); font-size: var(--fs-h1); margin: 0 0 10px; }
.page-head .standfirst { margin: 0; max-width: 62ch; }
.page-head + .page { padding-block-start: 0; } /* white-on-white: head already spaces */

/* Search field (/search page) — large pill input with inline magnifier; real GET form */
.search-form { position: relative; display: flex; gap: 8px; max-width: 560px; }
.search-ico { position: absolute; left: 16px; top: 50%; translate: 0 -50%; color: var(--muted); pointer-events: none; }
.search-form input {
  flex: 1; min-width: 0; font: inherit; color: var(--text);
  background: #fff; border: 1px solid var(--border);
  border-radius: var(--radius-pill); padding: 13px 18px 13px 44px;
}
.search-form input:focus { border-color: var(--azure); }
/* Live suggestions — plain links, Tab-accessible */
.suggest {
  position: absolute; top: calc(100% + 8px); left: 0; right: 0;
  z-index: 11; /* above the sticky header (10) — never slides under it on scroll */
  list-style: none; margin: 0; padding: 8px; text-align: left;
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow-lifted);
  max-height: min(60vh, 480px); overflow: auto; /* long lists scroll on mobile */
}
.suggest:empty { display: none; }
.suggest li { display: flex; align-items: flex-start; gap: var(--space-s); padding: 0 12px; border-radius: calc(var(--radius) - 8px); }
.suggest li:hover, .suggest li:focus-within { background: var(--moon); }
/* Focused-empty state labels ("Recent" / "Latest news") — quiet, non-interactive */
li.suggest-label {
  color: var(--muted); font-size: var(--fs-xs); font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.08em; padding-top: 8px;
}
.suggest li.suggest-label:hover { background: none; }
.search-results li.suggest-label { background: none; border: 0; box-shadow: none; padding: 8px 0 0; }
/* The link holds <mark>-split text nodes — it must lay out as flowing text,
   never as a flex row (flex would turn every fragment into its own item and
   stop titles from wrapping). ≥44px target comes from the block padding. */
.suggest a {
  flex: 1; min-width: 0; display: block; padding-block: 10px;
  color: var(--text); font-weight: 500; font-size: var(--fs-s); text-decoration: none;
  overflow-wrap: break-word;
}
.suggest small { margin-top: 12px; } /* date tracks the first title line */
.suggest::after {
  content: "Press Enter for all results"; display: block; margin-top: 4px;
  padding: 8px 12px 2px; border-top: 1px solid var(--border);
  color: var(--muted); font-size: var(--fs-xs);
}

/* Section header row (h2 + optional "All news →" link) */
.section-head {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: var(--space-s); margin: var(--space-l) 0 var(--space-m);
}
.section-head:first-child { margin-top: 0; }
.section-head h2 { margin: 0; color: var(--galaxy); font-size: var(--fs-h2); }
.more { font-weight: 600; text-decoration: none; white-space: nowrap; }
.more:hover { text-decoration: underline; }

/* Responsive 1/2/3-column grid (news cards + service tiles); container for @container */
.grid { display: grid; gap: var(--space-m); grid-template-columns: 1fr; container-type: inline-size; }
@media (min-width: 640px) { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 940px) { .grid { grid-template-columns: repeat(3, 1fr); } }
/* Subgrid: cover/title/desc/meta rows align across each card row */
@supports (grid-template-rows: subgrid) {
  .grid > .card:not(.card--featured, .tile) { display: grid; grid-template-rows: subgrid; grid-row: span 4; gap: 0; }
  .grid > .card:not(.card--featured, .tile) .body { display: grid; grid-template-rows: subgrid; grid-row: span 3; gap: 10px; }
}

/* News cards — image + clamped title/description + <time> meta; whole card
   clickable via stretched link. Chrome is single-signal: hairline on white,
   borderless on Moon (white-on-moon separates); hover = one elevate gesture. */
.card {
  position: relative; background: #fff; border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-ambient);
  display: flex; flex-direction: column; line-height: 1.45;
}
.band--moon :is(.card, .panel) { border-color: transparent; }
.card:hover, .card:focus-within { box-shadow: var(--shadow-lifted); }
/* Visible focus ring for the whole-card stretched link (WCAG 2.4.7) */
.card:focus-within { box-shadow: 0 0 0 2px var(--azure), var(--shadow-lifted); }
.card .cover { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.card .body { padding: var(--space-m); display: flex; flex-direction: column; gap: 10px; flex: 1; }
.card h3 {
  margin: 2px 0 0; font-size: var(--fs-l); line-height: 1.3; font-family: var(--font-body), sans-serif;
  display: -webkit-box; -webkit-line-clamp: 3; line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}
.card h3 a { color: var(--galaxy); text-decoration: none; }
/* Stretched link: the title's tap target covers the whole card (still one tab stop);
   ::before keeps ::after free for the external-link arrow */
.card h3 a::before { content: ""; position: absolute; inset: 0; }
.card h3 a:hover { color: var(--link); }
.card .desc {
  margin: 0; color: var(--muted); font-size: var(--fs-s);
  display: -webkit-box; -webkit-line-clamp: 2; line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.card .meta { margin-top: auto; color: var(--muted); font-size: var(--fs-xs); }
/* Lead story — larger, splits when the grid itself is wide enough (container query) */
@container (min-width: 640px) {
  .card--featured { grid-column: 1 / -1; display: grid; grid-template-columns: 3fr 2fr; }
  .card--featured .cover { height: 100%; aspect-ratio: auto; }
  .card--featured .body { padding: var(--space-l); justify-content: center; }
  .card--featured h3 { font-size: var(--fs-xl); font-family: var(--font-display), sans-serif; font-weight: 500; -webkit-line-clamp: 3; line-clamp: 3; }
  .card--featured .desc { -webkit-line-clamp: 3; line-clamp: 3; }
}

/* Pagination (news archive) — prev/next + windowed page numbers; ≥44px targets. */
.pagination {
  display: flex; align-items: center; justify-content: center; flex-wrap: wrap;
  gap: 4px var(--space-s); margin-top: var(--space-xl);
}
.pagination ol { display: flex; flex-wrap: wrap; justify-content: center; list-style: none; margin: 0; padding: 0; gap: 4px; }
.page-link {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 44px; min-height: 44px; padding: 0 12px;
  border-radius: var(--radius-pill); text-decoration: none; font-weight: 500; color: var(--text);
}
a.page-link:hover { background: var(--moon); }
.page-link[aria-current="page"] { background: var(--galaxy); color: #fff; }
.page-step { font-weight: 600; }
a.page-step { color: var(--link); }
span.page-step { color: var(--muted); } /* disabled end stop — non-interactive */
.page-gap { display: inline-flex; align-items: center; justify-content: center; min-width: 24px; min-height: 44px; color: var(--muted); }

/* Service tiles — card tokens; stroke glyph above an always-visible label
   (NN/g: icons differentiate and speed scanning only when labelled).
   Planned (not-yet-available) tiles are subdued: muted, no link, no chrome —
   availability lives in the description text ("— planned"). */
.tile { padding: var(--space-m); gap: 8px; }
.tile .ico { width: 26px; height: 26px; stroke-width: 1.75; stroke-linejoin: round; color: var(--galaxy); }
.tile h3 { margin: 0; }
.tile--planned :is(h3, .ico) { color: var(--muted); }

/* Article — 70ch column; on ≥1200px a sticky "On this page" rail sits to the right */
.article-layout { display: grid; grid-template-columns: minmax(0, 70ch); }
.article { padding-block: var(--space-l) var(--space-xl); max-width: 70ch; }
.article .back { color: var(--muted); font-size: var(--fs-s); }
.article h1 { color: var(--galaxy); font-size: var(--fs-h1); margin: 14px 0 10px; }
.article .meta {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px 10px;
  color: var(--muted); font-size: var(--fs-s); margin-bottom: var(--space-l);
}
/* Lead image — borderless, breaking slightly out of the text column on wide
   screens (editorial breakout; the column stays 70ch for reading) */
.article .cover { border-radius: var(--radius); margin-bottom: var(--space-l); }
@media (min-width: 900px) {
  .article .cover { margin-inline: -40px; width: calc(100% + 80px); max-width: none; }
}
/* Standfirst — the description shown as the visible lead under the headline
   (Guardian/BBC anatomy); also the intro line under section-landing h1s. */
.standfirst { margin: 0 0 var(--space-s); font-size: var(--fs-l); line-height: 1.55; color: var(--muted); }
/* Article TOC (Stripe/Apple-docs pattern, rendered only when ≥3 h2/h3):
   quiet "On this page" — sticky hairline-rule rail on wide screens, a light
   disclosure row otherwise. Links are muted, Galaxy on hover; the scrollspy
   active state (Galaxy text + Cherenkov rule segment) is navigation state,
   not decoration — it sits outside the one-accent budget. */
.toc { font-size: var(--fs-s); }
.toc strong, .toc summary {
  font-size: var(--fs-xs); text-transform: uppercase; font-weight: 600;
  letter-spacing: 0.08em; color: var(--muted);
}
.toc strong { display: block; margin-bottom: 10px; }
.toc ol { list-style: none; margin: 0; padding: 0; }
.toc li { margin: 6px 0; }
.toc .d3 { padding-left: var(--space-s); }
.toc a {
  color: var(--muted); text-decoration: none;
  display: inline-flex; align-items: center; min-height: 24px; position: relative;
}
.toc a:hover { color: var(--galaxy); }
/* Scrollspy state (set by the [slug].astro script) — functional, not motion */
.toc a[aria-current="true"] { color: var(--galaxy); font-weight: 600; }
/* Inline rendering (< 1200px): light disclosure row with a chevron */
.toc--inline { border: 1px solid var(--border); border-radius: var(--radius); padding: 4px var(--space-m); margin-bottom: var(--space-l); }
.toc--inline summary { display: flex; align-items: center; justify-content: space-between; gap: var(--space-s); min-height: 40px; }
.toc--inline summary .ico { width: 14px; height: 14px; }
.toc--inline[open] summary .ico { transform: rotate(180deg); }
.toc--inline ol { padding-bottom: var(--space-s); }
.toc--rail { display: none; }
@media (min-width: 1200px) {
  .article-layout { grid-template-columns: minmax(0, 70ch) 15rem; column-gap: var(--space-xl); justify-content: space-between; }
  .toc--inline { display: none; }
  .toc--rail {
    display: block; position: sticky; top: 80px; align-self: start;
    margin-top: calc(var(--space-l) + 44px); /* aligns with the article h1 */
    max-height: calc(100dvh - 104px); overflow: auto;
    border-left: 1px solid var(--border); padding-left: var(--space-m);
  }
  /* Active rule segment: 2px Cherenkov over the hairline, tracking the link */
  .toc--rail a[aria-current="true"]::before {
    content: ""; position: absolute; left: calc(-1 * var(--space-m) - 1px);
    top: 3px; bottom: 3px; width: 2px; background: var(--cherenkov);
  }
}

/* Long unbroken strings (URLs, identifiers) wrap instead of forcing page overflow */
.prose { line-height: 1.65; overflow-wrap: break-word; }
.prose a { overflow-wrap: anywhere; }
.prose h2 { color: var(--galaxy); margin: 44px 0 12px; font-size: var(--fs-xl); }
.prose h3 { color: var(--galaxy); margin: 30px 0 8px; font-size: var(--fs-l); }
.prose p { margin: 0 0 16px; }
.prose ul, .prose ol { margin: 0 0 16px; padding-left: 22px; }
.prose li { margin: 6px 0; }
.prose blockquote {
  margin: 22px 0; padding: 12px 20px; border-left: 3px solid var(--galaxy);
  background: var(--moon); color: var(--text);
}
.prose img { border: 1px solid var(--border); border-radius: var(--radius); }
.prose img + em, .prose p > em:only-child { color: var(--muted); font-size: var(--fs-s); }
.prose hr { border: 0; border-top: 1px solid var(--border); margin: 32px 0; }
/* Wide tables scroll inside their own box, never the page (mobile guard) */
.prose table { display: block; width: 100%; overflow-x: auto; border-collapse: collapse; margin: 0 0 16px; font-size: var(--fs-s); }
.prose th { text-align: left; font-weight: 600; color: var(--galaxy); }
.prose th, .prose td { padding: 10px 12px; border-bottom: 1px solid var(--border); }
.prose thead th { border-bottom: 2px solid var(--galaxy); }

/* Prev/next article links — sequential nav from the date-sorted collection */
.post-nav {
  display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-m);
  border-top: 1px solid var(--border); margin-top: var(--space-xl); padding-top: var(--space-m);
}
.post-nav a { display: block; min-width: 0; text-decoration: none; }
.post-nav .post-nav-prev { grid-column: 1; }
.post-nav .post-nav-next { grid-column: 2; text-align: right; }
.post-nav small {
  display: block; color: var(--muted); font-size: var(--fs-xs); font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 4px;
}
.post-nav .post-nav-title {
  color: var(--galaxy); font-weight: 500;
  display: -webkit-box; -webkit-line-clamp: 2; line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.post-nav a:hover .post-nav-title { color: var(--link); }

/* Generic page section — one rhythm token for all pages */
.page { padding-block: var(--space-xl); }
.panel {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: var(--space-m); box-shadow: var(--shadow-ambient);
}
.panel--narrow { max-width: 640px; }
.form-row { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
.form-row label { font-size: var(--fs-s); font-weight: 500; }
.form-row input, .form-row select, .form-row textarea {
  background: #fff; border: 1px solid var(--border); border-radius: calc(var(--radius) - 4px);
  color: var(--text); padding: 11px 12px; font: inherit;
}
.form-row input:focus, .form-row select:focus, .form-row textarea:focus { border-color: var(--azure); }
.btn {
  background: var(--cherenkov); color: var(--galaxy); border: 0;
  padding: 12px 24px; border-radius: var(--radius-pill);
  font: inherit; font-weight: 600; cursor: pointer;
}
.btn:hover { background: var(--cherenkov-hover); }
.notice { color: var(--muted); font-size: var(--fs-s); margin-top: 10px; }

/* Search results (list built by the inline script on /search) — card-like rows;
   same single-signal chrome as cards (borderless on Moon, shadow hover) */
.search-results { list-style: none; margin: var(--space-m) 0 0; padding: 0; max-width: 720px; display: grid; gap: var(--space-s); }
.search-results li {
  display: flex; align-items: flex-start; gap: var(--space-s);
  background: #fff; border-radius: var(--radius);
  padding: 12px 18px; box-shadow: var(--shadow-ambient);
}
.search-results li:hover { box-shadow: var(--shadow-lifted); }
/* Title flows as inline text (never display:flex — see .suggest a note) */
.search-results a { flex: 1; min-width: 0; overflow-wrap: break-word; text-decoration: none; font-weight: 500; }
.search-results a:hover { text-decoration: underline; }
/* Dates on results and suggestions — plain muted text, no chip chrome */
.search-results small, .suggest small { color: var(--muted); white-space: nowrap; font-size: var(--fs-xs); }
.search-results small { margin-top: 5px; } /* optical align with the first title line */
/* Matched-term highlight in results/suggestions (Starlight search pattern) —
   functional state, brand tint, no new hues */
mark { background: var(--tint-cherenkov); color: inherit; border-radius: calc(var(--radius) - 12px); padding: 0 2px; }

/* Mock/status badges — whisper-quiet hairline pill, ONLY where a mock
   interaction actually happens (/proposals, /dashboard, /login, /support head);
   REQUIREMENTS §5 honesty lives at the interaction point, not on every tile. */
.badge-mock, .badge-ext {
  display: inline-flex; align-items: center; gap: 6px; max-width: 100%;
  font-size: var(--fs-xs); font-weight: 500; color: var(--muted);
  background: var(--moon); border: 1px solid var(--border);
  border-radius: var(--radius-pill); padding: 2px 10px; margin-bottom: 14px;
}
.badge-mock::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--galaxy); flex: none; }

/* Dashboard mock — aggregation panels with status pills */
.dash-grid { display: grid; gap: var(--space-m); grid-template-columns: 1fr; margin-top: var(--space-s); }
@media (min-width: 940px) { .dash-grid { grid-template-columns: repeat(2, 1fr); } }
.panel-title { color: var(--galaxy); font-size: var(--fs-l); margin: 0 0 var(--space-s); font-family: var(--font-body), sans-serif; font-weight: 600; }
.rows { list-style: none; margin: 0; padding: 0; }
.rows li {
  display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap;
  padding: 10px 0; border-bottom: 1px solid var(--border); font-size: var(--fs-s);
}
.rows li:last-child { border-bottom: 0; }
.row-id { color: var(--muted); font-size: var(--fs-xs); min-width: 7.5em; }
.row-main { flex: 1; min-width: 12em; }
.row-date { color: var(--muted); font-size: var(--fs-xs); }
/* Status pills — neutral chrome; the label text carries the state */
.pill {
  font-size: var(--fs-xs); font-weight: 600; letter-spacing: 0.05em; text-transform: uppercase;
  padding: 3px 10px; border-radius: var(--radius-pill); border: 1px solid var(--border);
}
.pill--ok { color: var(--galaxy); background: var(--moon); }
.pill--review { color: var(--text); background: #fff; }
.pill--draft { color: var(--muted); background: #fff; }

/* Auth (login mock) — nebula backdrop + floating card; the ONLY navy band
   besides the home hero */
.auth-band {
  min-height: calc(100dvh - 56px); position: relative;
  display: grid; place-items: center; padding: var(--space-band) var(--gutter);
  background: var(--nebula), var(--galaxy);
}
.auth-card {
  position: relative; background: #fff; border-radius: calc(var(--radius) + 8px);
  padding: var(--space-l); max-width: 440px; width: 100%;
  box-shadow: var(--shadow-lifted);
}
.auth-logo { height: 24px; width: auto; margin-bottom: var(--space-m); }
/* Whisper badge sits top-right, off the reading flow (back in flow ≤480px
   where it would collide with the logo) */
.auth-card .badge-mock { position: absolute; top: var(--space-l); right: var(--space-l); margin: 0; }
@media (max-width: 480px) { .auth-card .badge-mock { position: static; margin-bottom: 14px; } }
.auth-card h1 { color: var(--galaxy); margin: 6px 0 10px; font-size: var(--fs-xl); }
.auth-card .muted { color: var(--muted); font-size: var(--fs-s); }
.btn-wide { width: 100%; margin-top: var(--space-s); }

/* Footer — brand band: logo + descriptor / spec links (§3.3.1) / demo note + flash.
   No top margin: Moon/Galaxy bands meet it flush; white pages pad via .page/.article. */
.footer { background: var(--galaxy); color: var(--on-galaxy-muted); font-size: var(--fs-s); line-height: 1.45; }
.footer .container { display: grid; gap: var(--space-m); padding-top: var(--space-xl); padding-bottom: var(--space-l); }
.foot-top { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-s) var(--space-m); }
.foot-top img { height: 30px; width: auto; }
.foot-top p { margin: 0; max-width: 60ch; }
.foot-links { display: flex; flex-wrap: wrap; gap: 4px var(--space-m); }
.foot-links a { color: #fff; font-weight: 500; text-decoration: none; display: inline-flex; align-items: center; min-height: 24px; }
.foot-links a[href]:hover { text-decoration: underline; }
.foot-links a:not([href]) { color: var(--on-galaxy-muted); }
.foot-note { display: flex; align-items: center; gap: var(--space-s); border-top: 1px solid rgba(255, 255, 255, 0.15); padding-top: var(--space-m); }

/* Whole-page ambient — a fixed brand-hue wash behind everything, opt-in per
   page via <Base ambient> (home only). Clearly visible pastel fields (alphas
   .16/.12/.10 — ceilings: links on the worst blob overlap stay ≥ 5.3:1); all
   reading surfaces (cards, panels, bands) are solid and cover it. Static when
   motion is reduced. */
.has-ambient::before {
  content: ""; position: fixed; inset: -30%; z-index: -1; pointer-events: none;
  background:
    radial-gradient(44% 38% at 82% 10%, rgba(0, 228, 216, 0.16), transparent 70%),
    radial-gradient(50% 44% at 6% 38%, rgba(0, 122, 255, 0.12), transparent 70%),
    radial-gradient(46% 40% at 68% 90%, rgba(0, 0, 156, 0.1), transparent 70%);
}

/* ==========================================================================
   Motion — ALL animation/transition lives in this block (WCAG 2.3.3; the
   reduce block above is a second safety net). One hover language: every
   interactive element fades color/background/border/shadow on the SAME two
   tokens (--dur/--ease — ctao.org's quiet-fade feel); cards elevate as one
   gesture (shadow + 2px lift). Nebula/ambient drift is transform-only and
   sized to be clearly perceptible within ~10s of looking.
   ========================================================================== */
@media (prefers-reduced-motion: no-preference) {
  @view-transition { navigation: auto; }
  html { scroll-behavior: smooth; }
  /* The auth band hands its glow to a roaming layer inside the .band-bg clip
     frame (same --nebula stack); the photo hero keeps its scrimmed photo and
     gets the lighter --nebula-glow drifting above it. */
  .auth-band { background: var(--galaxy); }
  .band-bg::before {
    content: ""; position: absolute; inset: -45% -30%;
    background: var(--nebula);
    animation: nebula 16s ease-in-out infinite alternate;
  }
  .hero-band .band-bg::before { background: var(--nebula-glow); }
  /* Whole-page wash — slow drift, clearly alive */
  .has-ambient::before { animation: ambient 36s ease-in-out infinite alternate; }
  /* Hero content rises in once, gently staggered */
  .hero > * { animation: rise 0.5s var(--ease) backwards; }
  .hero > :nth-child(2) { animation-delay: 0.08s; }
  .hero > :nth-child(3) { animation-delay: 0.16s; }
  .hero > :nth-child(4) { animation-delay: 0.24s; }
  .hero > :nth-child(5) { animation-delay: 0.32s; }
  /* Unified hover feedback — single-property fades, shared tokens */
  a, .btn, .post-nav-title {
    transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease),
      border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
  }
  .card, .search-results li { transition: box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease); }
  .card:hover { transform: translateY(-2px); } /* the one elevate gesture (no cover zoom) */
}
@keyframes nebula { /* inert unless applied inside the block above */
  from { transform: translate3d(-8%, -5%, 0) rotate(-6deg) scale(1); }
  to { transform: translate3d(8%, 6%, 0) rotate(6deg) scale(1.3); }
}
@keyframes ambient {
  from { transform: translate3d(-5%, -4%, 0) rotate(-10deg) scale(1); opacity: 0.85; }
  to { transform: translate3d(5%, 5%, 0) rotate(10deg) scale(1.16); opacity: 1; }
}
@keyframes rise { from { opacity: 0; transform: translateY(14px); } }