*, *::before, *::after { box-sizing: border-box; }
html { color-scheme: dark; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
.shell { width: var(--shell); margin-inline: auto; }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0; padding: 0; margin: -1px;
}

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--float-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--divider);
  /* Chromium leaves a stale backdrop-filter snapshot on a sticky element
     during scroll unless it's promoted to its own compositor layer. */
  transform: translateZ(0);
  will-change: transform;
}
.header-row {
  display: flex; align-items: center; gap: 20px;
  padding-block: 14px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-head); font-weight: 600; font-size: 18px;
  margin-right: auto;
}
.brand img { width: 30px; height: 30px; }
.main-nav { display: flex; gap: 4px; }
.main-nav a {
  display: flex; align-items: center; min-height: 44px; padding-inline: 14px;
  border-radius: var(--radius-pill);
  color: var(--muted);
  font-size: 14.5px;
  transition: color var(--duration) var(--ease-out), background var(--duration) var(--ease-out);
}
.main-nav a:hover { color: var(--text); background: color-mix(in srgb, var(--arc-white) 8%, transparent); }
.social-row { display: flex; align-items: center; gap: 4px; margin-left: 12px; }
.social-icon {
  display: flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; border-radius: var(--radius-pill);
  color: var(--muted);
  transition: color var(--duration) var(--ease-out), background var(--duration) var(--ease-out);
}
.social-icon svg { width: 18px; height: 18px; fill: currentColor; }
.social-icon:not([data-inert]):hover { color: var(--text); background: color-mix(in srgb, var(--arc-white) 8%, transparent); }
.social-icon[data-inert] { color: var(--faint); cursor: default; }
.social-icon[data-inert]:focus-visible { outline: 1px dashed var(--faint); outline-offset: 2px; }

/* ---------- CA slot ---------- */
.ca-bar {
  background: var(--bg-lift);
  border-bottom: 1px solid var(--divider);
}
.ca-row {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  padding-block: 10px;
  font-family: var(--font-mono);
}
.ca-label {
  font-size: 12px; letter-spacing: .06em; text-transform: uppercase; color: var(--faint);
}
.ca-value {
  font-size: clamp(13px, 2.4vw, 17px);
  word-break: break-all;
  color: var(--text);
}
.ca-value[data-status="absent"] { color: var(--faint); font-style: italic; }
.ca-copy {
  display: inline-flex; align-items: center; gap: 6px;
  min-height: 44px; padding-inline: 14px;
  border: 1px solid var(--divider); border-radius: var(--radius-pill);
  font-family: var(--font-body); font-size: 13px; color: var(--muted);
  margin-left: auto;
  transition: color var(--duration) var(--ease-out), border-color var(--duration) var(--ease-out);
}
.ca-copy:not(:disabled):hover { color: var(--text); border-color: var(--faint); }
.ca-copy:disabled { opacity: .5; cursor: default; }
.ca-copy[data-copied]::after { content: ' \2713'; }
.ca-dated { font-size: 12px; color: var(--faint); }

/* ---------- hero ---------- */
.hero {
  padding-block: clamp(56px, 10vw, 120px) clamp(48px, 8vw, 96px);
  text-align: center;
  position: relative;
}
.hero-mark { width: clamp(64px, 10vw, 108px); height: auto; margin-inline: auto; margin-bottom: 28px; }
.hero h1 {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(40px, 8vw, 92px);
  line-height: 1.02;
  letter-spacing: -.02em;
  margin: 0 0 18px;
}
.hero-lede {
  max-width: 640px; margin-inline: auto;
  color: var(--muted);
  font-size: clamp(15px, 2vw, 18px);
}
.hero-cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 32px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 44px; padding-inline: 22px;
  border-radius: var(--radius-pill);
  font-size: 14.5px; font-weight: 600;
  transition: transform var(--duration) var(--ease-out), background var(--duration) var(--ease-out), color var(--duration) var(--ease-out);
}
.btn-primary { background: var(--accent); color: var(--arc-ink); }
.btn-primary:hover { background: var(--accent-hi); }
.btn-ghost { border: 1px solid var(--divider); color: var(--text); }
.btn-ghost:hover { border-color: var(--faint); }

/* letter-light effect */
.lit .lit-word { display: inline-flex; }
.lit-letter {
  --glow: 0;
  display: inline-block;
  color: color-mix(in srgb, var(--text) calc(100% - var(--glow) * 0%), var(--accent-hi));
  text-shadow: 0 0 calc(var(--glow) * 22px) color-mix(in srgb, var(--accent-hi) calc(var(--glow) * 70%), transparent);
  will-change: transform;
}
@media (hover: none) { .lit-letter { --glow: 0; } }
@media (prefers-reduced-motion: reduce) { .lit-letter { --glow: 0; transition: none !important; } }

/* ---------- register / status panel ---------- */
.section { padding-block: clamp(48px, 8vw, 96px); }
.section-kicker {
  font-family: var(--font-mono); font-size: 12.5px; letter-spacing: .08em;
  text-transform: uppercase; color: var(--faint); margin-bottom: 10px;
}
.section-title {
  font-family: var(--font-head); font-weight: 600;
  font-size: clamp(28px, 4vw, 42px); margin: 0 0 14px;
}
.section-lede { color: var(--muted); max-width: 620px; margin: 0 0 32px; }

.register-grid {
  display: grid; gap: 1px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  background: var(--divider);
  border: 1px solid var(--divider);
  border-radius: var(--radius);
  overflow: hidden;
}
.register-cell { background: var(--bg-lift); padding: 22px; }
.register-key { font-size: 13px; color: var(--faint); margin-bottom: 8px; }
.register-value { font-family: var(--font-mono); font-size: 17px; word-break: break-word; }
.register-status {
  display: inline-flex; align-items: center; gap: 6px;
  margin-top: 10px; font-size: 12px; color: var(--faint);
}
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--faint); }
.dot[data-status="stated"] { background: var(--accent-hi); }
.dot[data-status="absent"], .dot[data-status="unconfirmed"] { background: var(--faint); }
[data-inert] { opacity: .82; }

/* ---------- doors / features ---------- */
.doors-grid {
  display: grid; gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}
.door-card {
  background: var(--bg-lift);
  border: 1px solid var(--divider);
  border-radius: var(--radius);
  padding: 26px;
  transition: border-color var(--duration) var(--ease-out), transform var(--duration) var(--ease-out);
}
.door-card:hover { border-color: var(--faint); transform: translateY(-2px); }
.door-title { font-family: var(--font-head); font-size: 20px; margin: 0 0 10px; }
.door-body { color: var(--muted); font-size: 14.5px; margin: 0; }

[data-reveal] { opacity: 0; transform: translateY(18px); transition: opacity .5s var(--ease-out), transform .5s var(--ease-out); transition-delay: calc(var(--i, 0) * .06s); }
[data-reveal].is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
}

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--divider);
  padding-block: 40px;
}
.footer-row { display: flex; flex-wrap: wrap; gap: 24px; justify-content: space-between; align-items: flex-start; }
.footer-brand { font-family: var(--font-head); font-weight: 600; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 16px; }
.footer-nav a { min-height: 44px; display: inline-flex; align-items: center; color: var(--muted); font-size: 13.5px; }
.footer-nav a:hover { color: var(--text); }
.footer-legal { color: var(--faint); font-size: 12.5px; max-width: 640px; margin-top: 18px; }
.footer-legal p { margin: 6px 0; }

@media (max-width: 900px) {
  .main-nav { display: none; }
}
@media (max-width: 560px) {
  .ca-row { flex-direction: column; align-items: flex-start; }
  .ca-copy { margin-left: 0; }
}