/* ==========================================================================
   Archetech AI Labs — landing page
   Tokens follow DESIGN.md (Archetech Construct). Amber is the brand accent,
   blueprint navy is structure, teal is reserved for "live" signals only.
   ========================================================================== */

:root {
  --void: #07080c;
  --void-2: #0c0f16;
  --blueprint: #141b2c;
  --blueprint-line: #2a3656;
  --platinum: #ece9e2;
  --muted: #8d94a7;
  --muted-2: #636b80;
  --amber: #e3a857;
  --amber-deep: #b9772f;
  --signal: #5ee6c0;

  /* AthenOps sub-brand (used on its card only) */
  --athen-navy: #0d1a33;
  --athen-navy-2: #12244a;
  --athen-gold: #d4af37;

  --line: rgba(236, 233, 226, 0.08);
  --line-2: rgba(236, 233, 226, 0.14);

  --font-display: "Space Grotesk", ui-sans-serif, system-ui, sans-serif;
  --font-body: "Plus Jakarta Sans", ui-sans-serif, system-ui, sans-serif;

  --step--1: 0.8125rem;
  --step-0: 1rem;
  --step-1: 1.125rem;
  --step-2: 1.375rem;
  --step-3: clamp(1.6rem, 1.2rem + 1.4vw, 2.25rem);
  --step-4: clamp(2rem, 1.4rem + 2.4vw, 3.25rem);
  --step-5: clamp(2.6rem, 1.6rem + 4.4vw, 5.25rem);

  --gutter: clamp(1.25rem, 4vw, 3rem);
  --maxw: 1200px;
  --radius-s: 6px;
  --radius-m: 10px;
  --radius-l: 18px;

  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--void);
  color: var(--platinum);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg, canvas { display: block; max-width: 100%; }
[hidden] { display: none !important; }
a { color: inherit; }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.08;
  letter-spacing: -0.025em;
  margin: 0;
  text-wrap: balance;
}
p { margin: 0; text-wrap: pretty; }
ul, ol { margin: 0; padding: 0; list-style: none; }

:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
  border-radius: 4px;
}
.skip {
  position: absolute; left: 1rem; top: -4rem; z-index: 100;
  background: var(--amber); color: var(--void); padding: .6rem 1rem; border-radius: var(--radius-s);
  font-weight: 600; text-decoration: none;
}
.skip:focus { top: 1rem; }
.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}

.wrap { width: min(100% - 2 * var(--gutter), var(--maxw)); margin-inline: auto; }

/* Blueprint grid backdrop, used sparingly */
.blueprint-bg {
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
}

/* ---------- Wordmark ---------- */
.wordmark {
  display: inline-flex; align-items: flex-end; gap: .55em;
  text-decoration: none; color: var(--platinum);
}
.wordmark__name {
  display: inline-flex; align-items: baseline;
  font-family: var(--font-display); font-weight: 600;
  font-size: 1.35rem; letter-spacing: -0.035em; line-height: 1;
}
.wordmark__a { width: .78em; height: .74em; margin-right: .02em; fill: currentColor; align-self: baseline; transform: translateY(.02em); }
.wordmark__labs {
  font-family: var(--font-display); font-weight: 400; font-size: .72rem;
  letter-spacing: .32em; color: var(--muted); padding-bottom: .12rem;
}

/* ---------- Buttons ---------- */
.btn {
  --h: 3rem;
  display: inline-flex; align-items: center; justify-content: center; gap: .6rem;
  min-height: var(--h); padding: 0 1.4rem; border-radius: 999px;
  font-family: var(--font-display); font-weight: 600; font-size: .95rem; letter-spacing: -0.005em;
  text-decoration: none; cursor: pointer; border: 1px solid transparent;
  transition: transform .2s ease, box-shadow .25s ease, background-color .2s ease, border-color .2s ease;
  white-space: nowrap;
}
.btn--primary { background: var(--amber); color: #120c03; }
.btn--primary:hover { transform: translateY(-1px); box-shadow: 0 0 0 1px rgba(227,168,87,.6), 0 10px 34px -8px rgba(227,168,87,.55); }
.btn--ghost { background: rgba(20,27,44,.45); color: var(--platinum); border-color: var(--line-2); backdrop-filter: blur(8px); }
.btn--ghost:hover { border-color: rgba(227,168,87,.6); background: rgba(227,168,87,.08); }
.btn--small { --h: 2.4rem; padding: 0 1.05rem; font-size: .875rem; }

.text-link {
  color: var(--platinum); text-decoration: none; font-weight: 600; font-family: var(--font-display);
  border-bottom: 1px solid rgba(227,168,87,.5); padding-bottom: 1px;
  transition: border-color .2s, color .2s;
}
.text-link:hover { color: var(--amber); border-color: var(--amber); }

/* ---------- Header ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  transition: background-color .3s ease, border-color .3s ease;
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  background: rgba(7,8,12,.78); backdrop-filter: blur(14px) saturate(1.2);
  border-bottom-color: var(--line);
}
.site-header__inner { display: flex; align-items: center; justify-content: space-between; height: 4.5rem; gap: 1.5rem; }
.nav { display: flex; align-items: center; gap: 2rem; }
.nav__links { display: flex; gap: 1.6rem; font-size: .9rem; }
.nav__links a { color: var(--muted); text-decoration: none; transition: color .2s; }
.nav__links a:hover { color: var(--platinum); }
.nav__toggle {
  display: none; background: none; border: 1px solid var(--line-2); color: var(--platinum);
  width: 2.6rem; height: 2.6rem; border-radius: 999px; cursor: pointer;
}
.nav__toggle span { display: block; width: 16px; height: 1.5px; background: currentColor; margin: 4px auto; transition: transform .25s; }
@media (max-width: 900px) {
  .nav__links {
    position: fixed; inset: 4.5rem 0 auto 0; flex-direction: column; gap: 0;
    background: rgba(7,8,12,.97); border-bottom: 1px solid var(--line);
    padding: .5rem var(--gutter) 1.25rem; font-size: 1.05rem;
    transform: translateY(-8px); opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s;
  }
  .nav__links a { padding: .85rem 0; border-bottom: 1px solid var(--line); color: var(--platinum); }
  .nav.is-open .nav__links { opacity: 1; transform: none; pointer-events: auto; }
  .nav__toggle { display: inline-block; }
  .nav { gap: .75rem; }
  .nav.is-open .nav__toggle span:first-child { transform: translateY(2.75px) rotate(45deg); }
  .nav.is-open .nav__toggle span:last-child { transform: translateY(-2.75px) rotate(-45deg); }
}
@media (max-width: 420px) { .nav .btn--small { display: none; } }

/* ---------- Hero ---------- */
.hero {
  position: relative; min-height: 100svh; display: grid; align-items: center;
  padding: 7rem 0 4rem; isolation: isolate; overflow: hidden;
}
.hero__canvas { position: absolute; inset: 0; z-index: -1; width: 100%; height: 100%; }
.hero::before {
  /* amber horizon glow, echoing the brand imagery */
  content: ""; position: absolute; z-index: -2; left: 50%; bottom: -30vh; width: 120vw; height: 60vh;
  transform: translateX(-50%);
  background: radial-gradient(closest-side, rgba(227,168,87,.22), rgba(185,119,47,.06) 55%, transparent 75%);
}
.hero::after {
  content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background:
    linear-gradient(90deg, var(--void) 0%, rgba(7,8,12,.82) 32%, rgba(7,8,12,0) 62%),
    linear-gradient(0deg, var(--void) 0%, transparent 22%);
}
.no-webgl .hero__canvas { background: radial-gradient(60% 60% at 70% 45%, rgba(42,54,86,.55), transparent 70%); }
.hero__content { max-width: 40rem; }
.hero__eyebrow {
  display: inline-flex; align-items: center; gap: .6rem;
  font-family: var(--font-display); font-size: .95rem; color: var(--muted); margin-bottom: 1.6rem;
}
.signal-dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--signal);
  box-shadow: 0 0 0 0 rgba(94,230,192,.5); animation: breathe 2.6s ease-in-out infinite;
}
@keyframes breathe { 0%,100% { box-shadow: 0 0 0 0 rgba(94,230,192,.45); } 50% { box-shadow: 0 0 0 6px rgba(94,230,192,0); } }
.hero h1 { font-size: var(--step-5); font-weight: 500; letter-spacing: -0.04em; line-height: 1.0; max-width: 14ch; }
.hero__sub { margin-top: 1.6rem; font-size: var(--step-1); color: #c3c6cf; max-width: 36rem; line-height: 1.65; }
.hero__actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 2.4rem; }
.trust { display: flex; flex-wrap: wrap; gap: .55rem 1.6rem; margin-top: 2.6rem; font-size: var(--step--1); color: var(--muted); }
.trust li { display: inline-flex; align-items: center; gap: .55rem; }
.trust li::before { content: ""; width: 6px; height: 6px; transform: rotate(45deg); border: 1px solid var(--amber); flex: none; }
.hero__coords {
  position: absolute; right: var(--gutter); bottom: 2rem; font-size: .75rem; color: var(--muted-2);
  font-family: var(--font-display); letter-spacing: .02em; text-align: right;
}
@media (max-width: 900px) {
  .hero { align-items: start; min-height: auto; padding-top: calc(4.5rem + min(40vh, 340px)); }
  .hero::after { background: linear-gradient(0deg, var(--void) 0%, rgba(7,8,12,.88) 45%, rgba(7,8,12,0) 72%); }
  .trust { flex-direction: column; }
  .hero__coords { display: none; }
}

/* ---------- Sections ---------- */
.section { padding: clamp(5rem, 10vw, 8.5rem) 0; position: relative; }
.section--tight { padding-top: 0; }
.section__head { max-width: 44rem; margin-bottom: clamp(2.5rem, 5vw, 4rem); }
.section__head h2 { font-size: var(--step-4); }
.section__head p { margin-top: 1rem; color: var(--muted); font-size: var(--step-1); }
.section__foot { margin-top: 2.5rem; color: var(--muted); }
.section__foot a { margin-left: .25rem; }

/* ---------- Services: one blueprint panel, four bays ---------- */
.bays {
  display: grid; grid-template-columns: repeat(2, 1fr);
  border: 1px solid var(--line-2); border-radius: var(--radius-l);
  background: linear-gradient(180deg, rgba(20,27,44,.55), rgba(12,15,22,.4));
  overflow: hidden; position: relative;
}
.bay { padding: clamp(1.75rem, 3.5vw, 2.75rem); position: relative; }
.bay:nth-child(even) { border-right: 1px solid var(--line); }
.bay:nth-child(2), .bay:nth-child(3) { border-bottom: 1px solid var(--line); }
.bay--lead {
  grid-column: 1 / -1; border-bottom: 1px solid var(--line);
  display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 5fr); gap: clamp(2rem, 5vw, 4rem); align-items: start;
  background: radial-gradient(70% 140% at 0% 0%, rgba(227,168,87,.10), transparent 60%);
}
.bay--lead::after { display: none; }
.bay--lead h3 { font-size: var(--step-3); margin: 1rem 0 .6rem; }
.bay__kicker { color: var(--platinum) !important; font-family: var(--font-display); font-size: var(--step-1); margin-bottom: 1rem; }
.chip--amber { color: var(--amber); border-color: rgba(227,168,87,.45); background: rgba(227,168,87,.08); }
.lead-steps { display: grid; gap: 1.25rem; position: relative; }
.lead-steps::before { content: ""; position: absolute; left: 1rem; top: 1rem; bottom: 1rem; width: 1px; background: linear-gradient(180deg, var(--amber), rgba(227,168,87,.12)); }
.lead-steps li { display: grid; grid-template-columns: 2rem 1fr; gap: 1rem; position: relative; }
.lead-steps__n { width: 2rem; height: 2rem; border-radius: 50%; display: grid; place-items: center; background: var(--void); border: 1px solid rgba(227,168,87,.6); color: var(--amber); font-family: var(--font-display); font-weight: 600; font-size: .85rem; }
.lead-steps h4 { font-family: var(--font-display); font-weight: 600; font-size: 1.05rem; margin: .2rem 0 .25rem; letter-spacing: -0.01em; }
.lead-steps p { color: var(--muted); font-size: .95rem; }
.bay__glyph { width: 44px; height: 44px; color: var(--amber); margin-bottom: 1.5rem; }
.bay__glyph * { vector-effect: non-scaling-stroke; }
.bay h3 { font-size: var(--step-2); margin-bottom: .75rem; }
.bay p { color: var(--muted); max-width: 34rem; }
.bay::after {
  /* hairline corner crosshair */
  content: ""; position: absolute; width: 9px; height: 9px; right: -5px; bottom: -5px;
  background:
    linear-gradient(var(--blueprint-line), var(--blueprint-line)) center/1px 100% no-repeat,
    linear-gradient(var(--blueprint-line), var(--blueprint-line)) center/100% 1px no-repeat;
}
@media (max-width: 760px) {
  .bays { grid-template-columns: 1fr; }
  .bay:nth-child(even) { border-right: 0; }
  .bay--lead { grid-template-columns: 1fr; }
  .bay:not(:last-child) { border-bottom: 1px solid var(--line); }
  .bay::after { display: none; }
}

/* ---------- Open source ---------- */
.oss { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: clamp(2rem, 5vw, 4.5rem); align-items: start; }
.network {
  position: sticky; top: 6rem; aspect-ratio: 1; border-radius: var(--radius-l);
  border: 1px solid var(--line); overflow: hidden; cursor: grab; touch-action: pan-y;
  background: radial-gradient(70% 70% at 50% 45%, rgba(42,54,86,.35), transparent 70%), var(--void-2);
}
.network:active { cursor: grabbing; }
.network canvas { width: 100%; height: 100%; }
.network__caption {
  position: absolute; left: 1.1rem; bottom: 1rem; right: 1.1rem; display: flex; align-items: center; gap: .55rem;
  font-size: .8rem; color: var(--muted); pointer-events: none;
}
.repos { border-top: 1px solid var(--line-2); }
.repo { padding: 2rem 0; border-bottom: 1px solid var(--line-2); display: grid; gap: .8rem; }
.repo__top { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: .5rem 1rem; }
.repo h3 { font-size: var(--step-2); }
.repo p { color: var(--muted); }
.chip {
  display: inline-flex; align-items: center; font-size: .75rem; color: var(--muted);
  border: 1px solid var(--line-2); border-radius: 999px; padding: .2rem .7rem; background: rgba(20,27,44,.5);
  font-family: var(--font-display);
}
.repo__links { display: flex; flex-wrap: wrap; gap: 1.25rem; font-size: .9rem; }
.repo__links a:empty, .repo__links a[hidden] { display: none; }
@media (max-width: 900px) {
  .oss { grid-template-columns: 1fr; }
  .network { position: relative; top: 0; max-height: 420px; width: 100%; }
}

/* ---------- AthenOps product card ---------- */
.athen {
  --rx: 0deg; --ry: 0deg;
  position: relative; border-radius: var(--radius-l); padding: clamp(1.75rem, 4vw, 3.25rem);
  background:
    radial-gradient(80% 120% at 100% 0%, rgba(212,175,55,.12), transparent 55%),
    linear-gradient(160deg, var(--athen-navy-2), var(--athen-navy) 60%);
  border: 1px solid rgba(212,175,55,.32);
  display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: clamp(2rem, 5vw, 4rem);
  transform: perspective(1400px) rotateX(var(--rx)) rotateY(var(--ry));
  transition: transform .4s cubic-bezier(.2,.7,.2,1);
  box-shadow: 0 40px 80px -40px rgba(0,0,0,.7);
}
.athen__brand { display: flex; align-items: center; gap: .9rem; margin-bottom: 1.8rem; flex-wrap: wrap; }
.athen__logo { display: inline-flex; align-items: center; gap: .55rem; font-family: var(--font-display); font-weight: 600; font-size: 1.3rem; letter-spacing: -0.02em; }
.athen__logo svg { width: 26px; height: 26px; color: var(--athen-gold); }
.badge {
  font-family: var(--font-display); font-size: .75rem; font-weight: 600;
  color: var(--athen-gold); background: rgba(212,175,55,.12); border: 1px solid rgba(212,175,55,.4);
  border-radius: 999px; padding: .2rem .75rem;
}
.athen h3 { font-size: var(--step-3); margin-bottom: 1rem; max-width: 22ch; }
.athen__body { color: #b9c1d6; }
.athen__list { margin-top: 1.75rem; display: grid; gap: .8rem; }
.athen__list li { display: grid; grid-template-columns: 20px 1fr; gap: .75rem; color: #dfe3ee; }
.athen__list svg { width: 18px; height: 18px; color: var(--athen-gold); margin-top: .2rem; }
.athen__h4 { font-family: var(--font-display); font-size: .95rem; font-weight: 600; margin-top: 2rem; color: var(--platinum); }
.roadmap { margin-top: 1.25rem; padding: 1rem 1.1rem; border: 1px dashed rgba(212,175,55,.3); border-radius: var(--radius-m); color: #9aa5c0; font-size: .92rem; }
.roadmap strong { color: #cfd6e6; font-weight: 600; }

.form { display: grid; gap: 1rem; align-content: start; background: rgba(5,10,24,.45); border: 1px solid rgba(212,175,55,.18); border-radius: var(--radius-m); padding: 1.5rem; }
.form h4 { font-size: 1.1rem; }
.field { display: grid; gap: .4rem; }
.field label { font-size: .85rem; color: #b9c1d6; }
.field input, .field select {
  width: 100%; min-height: 2.9rem; padding: 0 .9rem; border-radius: var(--radius-s);
  background: rgba(13,26,51,.8); color: var(--platinum); border: 1px solid rgba(236,233,226,.14);
  font: inherit; font-size: .95rem; transition: border-color .2s, box-shadow .2s;
}
.field select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, #b9c1d6 50%), linear-gradient(135deg, #b9c1d6 50%, transparent 50%); background-position: calc(100% - 18px) 52%, calc(100% - 13px) 52%; background-size: 5px 5px; background-repeat: no-repeat; }
.field input::placeholder { color: #6f7a95; }
.field input:focus, .field select:focus { outline: none; border-color: var(--athen-gold); box-shadow: 0 0 0 3px rgba(212,175,55,.18); }
.btn--gold { background: var(--athen-gold); color: #1a1403; }
.btn--gold:hover { transform: translateY(-1px); box-shadow: 0 10px 30px -10px rgba(212,175,55,.6); }
.form__note { font-size: .82rem; color: #8f9ab5; }
.form__status { font-size: .9rem; min-height: 1.4em; }
.form__status.is-ok { color: var(--signal); }
.form__status.is-err { color: #f2b8a2; }
.hp { display: none; }
@media (max-width: 900px) { .athen { grid-template-columns: 1fr; } }

/* ---------- How we work: a real sequence ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; counter-reset: step; position: relative; }
.steps::before {
  content: ""; position: absolute; left: 0; right: 0; top: 1.25rem; height: 1px;
  background: linear-gradient(90deg, var(--amber), rgba(227,168,87,.15) 70%, transparent);
}
.step { padding-right: 2rem; position: relative; }
.step__n {
  width: 2.5rem; height: 2.5rem; border-radius: 50%; display: grid; place-items: center;
  font-family: var(--font-display); font-weight: 600; font-size: .95rem;
  background: var(--void); border: 1px solid rgba(227,168,87,.6); color: var(--amber); margin-bottom: 1.6rem; position: relative;
}
.step:first-child .step__n { background: var(--amber); color: #120c03; }
.step h3 { font-size: var(--step-1); font-weight: 600; letter-spacing: -0.01em; margin-bottom: .6rem; }
.step p { color: var(--muted); font-size: .95rem; }
.ownership { margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--line); color: var(--platinum); font-family: var(--font-display); font-size: var(--step-1); }
@media (max-width: 900px) {
  .steps { grid-template-columns: 1fr; gap: 2rem; }
  .steps::before { left: 1.25rem; right: auto; top: 0; bottom: 0; width: 1px; height: auto; background: linear-gradient(180deg, var(--amber), rgba(227,168,87,.12)); }
  .step { padding: 0 0 0 4rem; }
  .step__n { position: absolute; left: 0; top: -.35rem; margin: 0; }
}

/* ---------- Founding partners ---------- */
.partners { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: clamp(2rem, 6vw, 5rem); align-items: start; }
.partners__intro h2 { font-size: var(--step-4); }
.partners__intro p { margin-top: 1.25rem; color: #c3c6cf; }
.partners__intro .btn { margin-top: 2rem; }
.partners__fine { margin-top: 1rem; font-size: .85rem; color: var(--muted-2); }
.perks { display: grid; gap: 0; border-top: 1px solid var(--line-2); }
.perk { padding: 1.5rem 0; border-bottom: 1px solid var(--line-2); display: grid; grid-template-columns: minmax(0, 12rem) 1fr; gap: 1.5rem; }
.perk dt { font-family: var(--font-display); font-weight: 600; font-size: 1.05rem; }
.perk dd { margin: 0; color: var(--muted); }
@media (max-width: 900px) { .partners { grid-template-columns: 1fr; } }
@media (max-width: 560px) { .perk { grid-template-columns: 1fr; gap: .4rem; } }

/* ---------- Founder ---------- */
.founder { display: grid; grid-template-columns: auto 1fr; gap: clamp(2rem, 5vw, 4rem); align-items: center; }
.portrait {
  width: clamp(180px, 22vw, 260px); aspect-ratio: 4/5; border-radius: var(--radius-l); overflow: hidden;
  position: relative; background: linear-gradient(160deg, var(--blueprint), var(--void-2)); border: 1px solid var(--line-2);
}
.portrait img { width: 100%; height: 100%; object-fit: cover; }
.portrait__fallback { position: absolute; inset: 0; display: grid; place-items: center; }
.portrait__fallback svg { width: 42%; color: var(--amber); opacity: .85; }
.portrait img + .portrait__fallback { display: none; }
.portrait.is-missing img { display: none; }
.portrait.is-missing .portrait__fallback { display: grid; }
.founder__name { font-family: var(--font-display); font-size: var(--step-2); font-weight: 500; }
.founder__title { color: var(--muted); margin-top: .2rem; }
.founder__bio { margin-top: 1.5rem; display: grid; gap: 1rem; color: #c9ccd4; max-width: 40rem; font-size: var(--step-1); line-height: 1.7; }
.founder__links { display: flex; gap: 1.5rem; margin-top: 1.75rem; flex-wrap: wrap; }
@media (max-width: 700px) { .founder { grid-template-columns: 1fr; } }

/* ---------- FAQ ---------- */
.faq { max-width: 50rem; border-top: 1px solid var(--line-2); }
.faq details { border-bottom: 1px solid var(--line-2); }
.faq summary {
  list-style: none; cursor: pointer; padding: 1.5rem 3rem 1.5rem 0; position: relative;
  font-family: var(--font-display); font-size: var(--step-1); font-weight: 500;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: ""; position: absolute; right: .4rem; top: 50%; width: 12px; height: 12px; margin-top: -6px;
  background:
    linear-gradient(var(--amber), var(--amber)) center/100% 1.5px no-repeat,
    linear-gradient(var(--amber), var(--amber)) center/1.5px 100% no-repeat;
  transition: transform .25s ease;
}
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { padding: 0 3rem 1.6rem 0; color: var(--muted); max-width: 42rem; }

/* ---------- Final CTA with perspective horizon ---------- */
.closing { position: relative; overflow: hidden; padding: clamp(7rem, 14vw, 11rem) 0 clamp(9rem, 16vw, 13rem); text-align: center; isolation: isolate; }
.horizon { position: absolute; inset: 0; z-index: -1; perspective: 420px; perspective-origin: 50% 35%; pointer-events: none; }
.horizon__floor {
  position: absolute; left: -50%; right: -50%; top: 55%; height: 140%;
  transform: rotateX(72deg); transform-origin: top center;
  background-image:
    linear-gradient(rgba(227,168,87,.32) 1px, transparent 1px),
    linear-gradient(90deg, rgba(90,110,170,.28) 1px, transparent 1px);
  background-size: 64px 64px;
  animation: floor 6s linear infinite;
  mask-image: linear-gradient(180deg, transparent 0%, #000 20%, #000 60%, transparent 100%);
  -webkit-mask-image: linear-gradient(180deg, transparent 0%, #000 20%, #000 60%, transparent 100%);
}
@keyframes floor { to { background-position: 0 64px, 0 0; } }
.horizon::before {
  content: ""; position: absolute; left: 50%; top: 55%; width: 90vw; height: 50vh; transform: translate(-50%, -50%);
  background: radial-gradient(closest-side, rgba(227,168,87,.28), transparent 70%);
}
.horizon::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, var(--void) 0%, transparent 30%, transparent 80%, var(--void) 100%); }
.closing h2 { font-size: var(--step-4); max-width: 20ch; margin-inline: auto; }
.closing p { margin: 1.25rem auto 0; color: #c3c6cf; max-width: 36rem; font-size: var(--step-1); }
.closing .btn { margin-top: 2.25rem; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--line); padding: 3.5rem 0 2.5rem; font-size: .9rem; color: var(--muted); }
.footer__grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 2rem; }
.footer__tag { margin-top: 1rem; max-width: 22rem; }
.footer__col h4 { font-family: var(--font-display); font-size: .9rem; font-weight: 600; color: var(--platinum); margin-bottom: .9rem; letter-spacing: 0; }
.footer__col ul { display: grid; gap: .55rem; }
.footer__col a { text-decoration: none; color: var(--muted); transition: color .2s; }
.footer__col a:hover { color: var(--platinum); }
.footer__base { margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--line); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem; font-size: .82rem; color: var(--muted-2); }
@media (max-width: 760px) { .footer__grid { grid-template-columns: 1fr 1fr; } .footer__brand { grid-column: 1 / -1; } }

/* ---------- Motion preferences ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .athen { transform: none !important; }
}