:root {
  color-scheme: dark;
  --ink: #050d1a;
  --ink-soft: #081524;
  --panel: rgba(7, 20, 38, 0.86);
  --panel-solid: #071426;
  --text: #f5f8ff;
  --muted: #b7c4d8;
  --dim: #8190a7;
  --cyan: #00e5ff;
  --amber: #ffc857;
  --violet: #9b8afb;
  --coral: #ff5a7a;
  --mint: #70e0b1;
  --line: rgba(126, 200, 255, 0.28);
  --line-strong: rgba(0, 229, 255, 0.58);
  --shell: 1180px;
  --radius: 6px;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.34);
}

* { box-sizing: border-box; }
html { background: var(--ink); scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 0;
  background: var(--ink);
  color: var(--text);
  font-family: Inter, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  letter-spacing: 0;
}
a { color: inherit; text-decoration: none; }
a:hover { color: var(--cyan); }
button, a { -webkit-tap-highlight-color: transparent; }
button, .button { min-height: 46px; }
:focus-visible { outline: 3px solid var(--amber); outline-offset: 4px; }
.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  border-radius: 4px;
  background: #ffffff;
  color: #050d1a;
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }
.shell { width: min(var(--shell), calc(100% - 48px)); margin-inline: auto; }
.site-header {
  position: fixed;
  z-index: 30;
  inset: 0 0 auto;
  border-bottom: 1px solid transparent;
  background: rgba(5, 13, 26, 0.7);
  backdrop-filter: blur(18px) saturate(125%);
}
.site-header[data-scrolled="true"] {
  border-bottom-color: var(--line);
  background: rgba(5, 13, 26, 0.94);
}
.nav {
  display: flex;
  min-height: 70px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 11px;
  font-size: 1rem;
  font-weight: 800;
}
.brand-mark {
  position: relative;
  width: 30px;
  height: 30px;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
}
.brand-mark::before, .brand-mark::after { position: absolute; content: ""; }
.brand-mark::before {
  inset: 7px;
  border: 2px solid var(--cyan);
  transform: rotate(45deg);
}
.brand-mark::after {
  width: 6px;
  height: 6px;
  top: -4px;
  right: -4px;
  background: var(--amber);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  color: var(--muted);
  font-size: 0.94rem;
  font-weight: 650;
}
.nav-links [aria-current="page"] { color: var(--text); }
.nav-cta {
  display: inline-flex;
  align-items: center;
  padding: 8px 13px;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  color: var(--cyan);
}
.menu-button {
  display: none;
  width: 46px;
  height: 46px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--panel-solid);
  color: var(--text);
  cursor: pointer;
}
.menu-button span, .menu-button::before, .menu-button::after {
  display: block;
  width: 20px;
  height: 2px;
  margin: 4px auto;
  background: currentColor;
  content: "";
}
main { overflow: clip; }
.hero {
  position: relative;
  display: flex;
  min-height: min(840px, 88vh);
  align-items: center;
  isolation: isolate;
  padding: 126px 0 82px;
  background-color: var(--ink);
  background-image: url("chronospark-temporal-field.jpg");
  background-position: center;
  background-size: cover;
}
.hero::before {
  position: absolute;
  z-index: -1;
  inset: 0;
  background: rgba(5, 13, 26, 0.56);
  content: "";
}
.hero-copy { max-width: 670px; }
.kicker, .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  color: var(--cyan);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}
.kicker::before, .eyebrow::before {
  width: 30px;
  height: 2px;
  background: var(--amber);
  content: "";
}
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { line-height: 1.12; letter-spacing: 0; }
h1 {
  max-width: 14ch;
  margin-bottom: 22px;
  font-size: 6.8rem;
  font-weight: 820;
}
h2 {
  max-width: 17ch;
  margin-bottom: 16px;
  font-size: 4rem;
}
h3 { font-size: 1.16rem; }
.lede {
  max-width: 58ch;
  margin-bottom: 0;
  color: #d4dfef;
  font-size: 1.2rem;
}
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 10px 17px;
  border: 1px solid var(--line);
  border-radius: 4px;
  font-weight: 760;
  transition: border-color 160ms ease, background-color 160ms ease, color 160ms ease, transform 160ms ease;
}
.button:hover { transform: translateY(-2px); }
.button.primary { border-color: var(--cyan); background: var(--cyan); color: #02111d; }
.button.primary:hover { border-color: #ffffff; background: #ffffff; color: #02111d; }
.button.quiet { background: rgba(5, 13, 26, 0.66); color: var(--text); }
.microcopy { max-width: 58ch; margin: 22px 0 0; color: var(--dim); font-size: 0.9rem; }
.status-band { position: relative; z-index: 2; margin-top: -30px; }
.status-band-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 22px;
  min-height: 92px;
  padding: 18px 22px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--amber);
  border-radius: var(--radius);
  background: rgba(7, 20, 38, 0.94);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}
.status-label { color: var(--amber); font-size: 0.76rem; font-weight: 800; text-transform: uppercase; }
.status-band p { margin: 0; color: var(--muted); }
.text-link { display: inline-flex; min-height: 44px; align-items: center; color: var(--cyan); font-weight: 760; }
.section { padding: 110px 0; }
.section.compact { padding: 74px 0; }
.section.alt { border-block: 1px solid rgba(126, 200, 255, 0.12); background: #071322; }
.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(260px, 0.65fr);
  align-items: end;
  gap: 60px;
  margin-bottom: 52px;
}
.section-head p { margin: 0; color: var(--muted); }
.human-loop { display: grid; grid-template-columns: repeat(5, 1fr); border-block: 1px solid var(--line); }
.loop-step { position: relative; min-height: 190px; padding: 28px 24px; border-right: 1px solid var(--line); }
.loop-step:last-child { border-right: 0; }
.loop-step::after {
  position: absolute;
  top: 50%;
  right: -8px;
  z-index: 2;
  width: 14px;
  height: 14px;
  border-top: 2px solid var(--cyan);
  border-right: 2px solid var(--cyan);
  background: var(--ink);
  content: "";
  transform: rotate(45deg) translateY(-50%);
}
.loop-step:last-child::after { display: none; }
.loop-step span { display: block; margin-bottom: 24px; color: var(--amber); font-size: 0.78rem; font-weight: 800; }
.loop-step p { margin: 0; color: var(--muted); font-size: 0.93rem; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.feature-card, .truth-cell, .surface-card, .availability-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}
.feature-card { min-height: 250px; padding: 26px; }
.feature-card .index { display: inline-block; margin-bottom: 48px; color: var(--cyan); font-size: 0.76rem; font-weight: 800; }
.feature-card:nth-child(2n) .index { color: var(--amber); }
.feature-card:nth-child(3n) .index { color: var(--violet); }
.feature-card p, .truth-cell p, .surface-card p, .availability-card p { margin-bottom: 0; color: var(--muted); }
.truth-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; border: 1px solid var(--line); background: var(--line); }
.truth-cell { min-height: 190px; padding: 28px; border: 0; border-radius: 0; background: var(--ink-soft); }
.truth-cell strong { display: block; margin-bottom: 9px; color: var(--mint); }
.truth-cell.caution strong { color: var(--amber); }
.page-hero { min-height: 520px; padding: 160px 0 82px; }
.page-hero h1 { max-width: 17ch; font-size: 5.8rem; }
.page-hero p { max-width: 64ch; }
.surface-list { display: grid; gap: 18px; }
.surface-card {
  display: grid;
  grid-template-columns: 150px minmax(0, 0.85fr) minmax(280px, 1.15fr);
  gap: 28px;
  align-items: start;
  padding: 30px;
}
.surface-card .surface-id { color: var(--cyan); font-size: 0.78rem; font-weight: 800; text-transform: uppercase; }
.surface-card ul, .policy-list { margin: 0; padding-left: 20px; color: var(--muted); }
.surface-card li + li, .policy-list li + li { margin-top: 8px; }
.model-note {
  margin: 34px 0 0;
  padding: 18px 20px;
  border-left: 4px solid var(--violet);
  background: rgba(155, 138, 251, 0.08);
  color: var(--muted);
}
.availability { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.availability-card { padding: 26px; }
.availability-card .state {
  display: inline-block;
  margin-bottom: 36px;
  padding-bottom: 4px;
  border-bottom: 2px solid var(--amber);
  color: var(--amber);
  font-size: 0.76rem;
  font-weight: 800;
  text-transform: uppercase;
}
.availability-card.available .state { border-color: var(--mint); color: var(--mint); }
.availability-card h2 { font-size: 1.45rem; }
.notice {
  margin: 32px auto 0;
  padding: 20px 22px;
  border: 1px solid rgba(255, 200, 87, 0.45);
  border-left: 4px solid var(--amber);
  border-radius: var(--radius);
  background: rgba(255, 200, 87, 0.06);
  color: var(--muted);
}
.cta-band { border-block: 1px solid var(--line); background: #071426; }
.cta-band-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 34px; padding-block: 58px; }
.cta-band h2 { max-width: 22ch; margin: 0; font-size: 2.2rem; }
.site-footer { border-top: 1px solid var(--line); background: #030a13; }
.footer { display: grid; grid-template-columns: 1.4fr 0.8fr 0.8fr; gap: 48px; padding: 58px 0 40px; color: var(--muted); }
.footer strong, .footer h2 { color: var(--text); }
.footer h2 { margin-bottom: 16px; font-size: 0.9rem; text-transform: uppercase; }
.footer a { display: flex; width: fit-content; min-height: 44px; align-items: center; }
.copyright { padding: 20px 0 34px; border-top: 1px solid rgba(126, 200, 255, 0.12); color: var(--dim); font-size: 0.86rem; }
.app-placeholder { display: grid; min-height: 100vh; place-items: center; padding: 120px 0 70px; text-align: center; }
.app-placeholder > div { max-width: 720px; }
.app-placeholder h1 { max-width: none; }
.app-placeholder .actions { justify-content: center; }

@media (max-width: 980px) {
  h1 { font-size: 5.2rem; }
  h2 { font-size: 3.25rem; }
  .page-hero h1 { font-size: 4.8rem; }
  .human-loop { grid-template-columns: 1fr; }
  .loop-step { min-height: 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .loop-step:last-child { border-bottom: 0; }
  .loop-step::after { top: auto; right: 28px; bottom: -7px; transform: rotate(135deg); }
  .feature-grid, .availability { grid-template-columns: repeat(2, 1fr); }
  .surface-card { grid-template-columns: 110px 1fr; }
  .surface-card ul { grid-column: 2; }
}

@media (max-width: 760px) {
  .shell { width: min(var(--shell), calc(100% - 32px)); }
  .menu-button { display: block; }
  .nav-links {
    position: absolute;
    top: 69px;
    right: 16px;
    left: 16px;
    display: none;
    align-items: stretch;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: #071426;
    box-shadow: var(--shadow);
  }
  .nav-links[data-open="true"] { display: grid; }
  .nav-links a { min-height: 46px; padding: 11px 12px; }
  .hero { min-height: 820px; align-items: flex-end; padding-bottom: 100px; background-position: 65% center; }
  h1 { font-size: 3.5rem; }
  h2 { font-size: 2.65rem; }
  .page-hero h1 { font-size: 3.5rem; }
  .section, .section.compact { padding: 74px 0; }
  .section-head, .status-band-inner, .truth-grid, .cta-band-inner, .footer { grid-template-columns: 1fr; }
  .section-head { gap: 20px; }
  .status-band-inner { gap: 10px; }
  .feature-grid, .availability { grid-template-columns: 1fr; }
  .surface-card { grid-template-columns: 1fr; }
  .surface-card ul { grid-column: auto; }
  .cta-band-inner .actions { margin-top: 0; }
}

@media (max-width: 420px) {
  h1 { font-size: 3rem; }
  .page-hero h1 { font-size: 3rem; }
  .lede { font-size: 1.08rem; }
  .actions, .button { width: 100%; }
}

@media (max-width: 360px) {
  h1, .page-hero h1 { font-size: 2.55rem; }
  .brand > span:last-child { display: none; }
}

@media (max-width: 760px) and (max-height: 650px) {
  .hero {
    min-height: 540px;
    align-items: center;
    padding: 92px 0 36px;
  }

  .hero .microcopy { display: none; }
  .hero .actions { margin-top: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}