:root {
  color-scheme: dark;
  --ink: #f4f8ff;
  --muted: #9aa9bd;
  --panel: rgba(12, 25, 42, 0.82);
  --panel-strong: #0c1b2d;
  --line: rgba(111, 226, 255, 0.16);
  --cyan: #42e8ff;
  --violet: #8a6cff;
  --green: #57efb5;
  --page: #030b16;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  background: var(--page);
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 8%, rgba(66, 232, 255, 0.1), transparent 28rem),
    radial-gradient(circle at 84% 28%, rgba(138, 108, 255, 0.12), transparent 30rem),
    linear-gradient(rgba(61, 115, 159, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(61, 115, 159, 0.045) 1px, transparent 1px),
    var(--page);
  background-size: auto, auto, 56px 56px, 56px 56px, auto;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

.skip-link {
  position: fixed;
  z-index: 20;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  border-radius: 10px;
  color: #001018;
  background: var(--cyan);
  transform: translateY(-150%);
}

.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  z-index: 10;
  top: 0;
  border-bottom: 1px solid var(--line);
  background: rgba(3, 11, 22, 0.8);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1120px, calc(100% - 40px));
  min-height: 72px;
  margin: 0 auto;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-size: 1.05rem;
  font-weight: 850;
  letter-spacing: 0.08em;
}

.brand-mark {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border: 1px solid rgba(66, 232, 255, 0.36);
  border-radius: 11px;
  color: var(--cyan);
  background: linear-gradient(145deg, rgba(66, 232, 255, 0.12), rgba(138, 108, 255, 0.18));
  box-shadow: inset 0 0 20px rgba(66, 232, 255, 0.08), 0 0 30px rgba(66, 232, 255, 0.08);
}

.brand-mark svg { width: 21px; height: 21px; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-links a,
.footer-links a {
  color: var(--muted);
  text-decoration: none;
  transition: color 160ms ease;
}

.nav-links a:hover,
.nav-links a[aria-current="page"],
.footer-links a:hover { color: var(--cyan); }

.menu-button {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--ink);
  background: var(--panel);
}

.menu-button svg { width: 22px; height: 22px; }

main { overflow: hidden; }

.hero,
.document-shell,
.feature-shell {
  width: min(1120px, calc(100% - 40px));
  margin-inline: auto;
}

.hero {
  display: grid;
  min-height: 680px;
  padding: 110px 0 84px;
  align-items: center;
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.92fr);
  gap: clamp(48px, 8vw, 112px);
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--cyan);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1, h2, h3 { line-height: 1.12; }

h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(3rem, 7vw, 6.6rem);
  letter-spacing: -0.065em;
}

.gradient-text {
  color: transparent;
  background: linear-gradient(100deg, var(--cyan), #8ea5ff 50%, var(--violet));
  background-clip: text;
  -webkit-background-clip: text;
}

.lead {
  max-width: 650px;
  margin: 28px 0 0;
  color: #b5c2d2;
  font-size: clamp(1.08rem, 2vw, 1.3rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  border: 1px solid rgba(66, 232, 255, 0.42);
  border-radius: 14px;
  color: #021119;
  background: linear-gradient(115deg, var(--cyan), #74f1dc);
  box-shadow: 0 10px 35px rgba(66, 232, 255, 0.14);
  font-weight: 800;
  text-decoration: none;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.button:hover { transform: translateY(-2px); box-shadow: 0 14px 42px rgba(66, 232, 255, 0.22); }
.button:active { transform: translateY(0) scale(0.98); }

.button.secondary {
  color: var(--ink);
  background: rgba(13, 27, 46, 0.75);
  border-color: var(--line);
  box-shadow: none;
}

.system-card {
  position: relative;
  padding: 28px;
  overflow: hidden;
  border: 1px solid rgba(66, 232, 255, 0.25);
  border-radius: 28px;
  background: linear-gradient(155deg, rgba(17, 38, 61, 0.92), rgba(7, 16, 30, 0.88));
  box-shadow: var(--shadow), inset 0 1px rgba(255, 255, 255, 0.04);
}

.system-card::before {
  position: absolute;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  content: "";
  top: -90px;
  right: -80px;
  background: var(--cyan);
  filter: blur(100px);
  opacity: 0.25;
}

.system-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--cyan);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.16em;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 16px var(--green);
}

.protocol-ring {
  display: grid;
  width: 178px;
  height: 178px;
  margin: 42px auto;
  place-items: center;
  border: 1px dashed rgba(66, 232, 255, 0.35);
  border-radius: 50%;
}

.protocol-ring::before {
  display: grid;
  width: 124px;
  height: 124px;
  place-items: center;
  border: 1px solid rgba(66, 232, 255, 0.48);
  border-radius: 50%;
  color: var(--ink);
  background: radial-gradient(circle at 36% 28%, rgba(66, 232, 255, 0.8), rgba(67, 83, 197, 0.7) 50%, rgba(18, 31, 50, 0.9) 72%);
  box-shadow: 0 0 46px rgba(66, 232, 255, 0.22);
  content: "3 / 3";
  font-size: 2rem;
  font-weight: 850;
}

.metric-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.metric {
  padding: 15px 10px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(2, 10, 20, 0.55);
  text-align: center;
}

.metric strong { display: block; font-size: 1.18rem; }
.metric span { color: var(--muted); font-size: 0.72rem; letter-spacing: 0.08em; }

.feature-shell { padding: 60px 0 110px; }

.section-heading {
  max-width: 650px;
  margin-bottom: 34px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.5rem);
  letter-spacing: -0.04em;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.feature-card {
  min-height: 230px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--panel);
}

.feature-index { color: var(--cyan); font: 800 0.75rem/1 monospace; letter-spacing: 0.12em; }
.feature-card h3 { margin: 64px 0 10px; font-size: 1.35rem; }
.feature-card p { margin: 0; color: var(--muted); }

.privacy-note {
  display: flex;
  margin-top: 18px;
  padding: 22px 24px;
  align-items: flex-start;
  gap: 16px;
  border: 1px solid rgba(87, 239, 181, 0.2);
  border-radius: 18px;
  background: rgba(87, 239, 181, 0.055);
}

.privacy-note svg { flex: 0 0 auto; width: 24px; color: var(--green); }
.privacy-note strong { display: block; margin-bottom: 3px; }
.privacy-note p { margin: 0; color: var(--muted); }

.document-shell {
  display: grid;
  padding: 76px 0 110px;
  grid-template-columns: 250px minmax(0, 760px);
  justify-content: space-between;
  gap: 72px;
}

.document-aside { align-self: start; }
.document-aside .eyebrow { margin-bottom: 10px; }
.document-aside p { color: var(--muted); }

.document-nav {
  display: grid;
  margin-top: 28px;
  gap: 7px;
}

.document-nav a {
  padding: 10px 12px;
  border-radius: 10px;
  color: var(--muted);
  text-decoration: none;
}

.document-nav a:hover { color: var(--cyan); background: rgba(66, 232, 255, 0.06); }

.document h1 {
  margin-bottom: 18px;
  font-size: clamp(2.5rem, 6vw, 4.7rem);
}

.updated { margin-bottom: 48px; color: var(--muted); }

.document section {
  padding: 32px 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 90px;
}

.document h2 { margin: 0 0 14px; font-size: 1.48rem; letter-spacing: -0.02em; }
.document h3 { margin: 24px 0 10px; font-size: 1.08rem; }
.document p, .document li { color: #b7c3d2; }
.document ul { padding-left: 22px; }
.document li + li { margin-top: 8px; }
.document a:not(.button) { color: var(--cyan); text-underline-offset: 3px; }

.callout {
  margin: 24px 0;
  padding: 20px 22px;
  border-left: 3px solid var(--cyan);
  border-radius: 0 14px 14px 0;
  background: rgba(66, 232, 255, 0.07);
}

.support-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin: 28px 0 10px;
}

.support-card {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel);
}

.support-card h2 { font-size: 1.15rem; }
.support-card p { margin-bottom: 0; }

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.footer-inner {
  display: flex;
  width: min(1120px, calc(100% - 40px));
  min-height: 120px;
  margin: 0 auto;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.footer-inner p { margin: 0; }
.footer-links { display: flex; flex-wrap: wrap; gap: 18px; }

:focus-visible { outline: 3px solid rgba(66, 232, 255, 0.7); outline-offset: 3px; }

@media (max-width: 860px) {
  .menu-button { display: inline-flex; }
  .nav-links {
    position: absolute;
    top: calc(100% + 8px);
    right: 20px;
    display: none;
    width: min(280px, calc(100vw - 40px));
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: #081525;
    box-shadow: var(--shadow);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .nav-links.open { display: flex; }
  .nav-links a { min-height: 46px; padding: 10px 12px; }
  .hero { min-height: auto; padding-top: 80px; grid-template-columns: 1fr; }
  .system-card { width: min(100%, 500px); }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-card { min-height: 190px; }
  .feature-card h3 { margin-top: 45px; }
  .document-shell { grid-template-columns: 1fr; gap: 32px; }
  .document-nav { display: none; }
}

@media (max-width: 580px) {
  .nav, .hero, .document-shell, .feature-shell, .footer-inner { width: min(100% - 28px, 1120px); }
  .nav { min-height: 64px; }
  .hero { padding: 66px 0 60px; }
  h1 { font-size: clamp(2.75rem, 16vw, 4.3rem); }
  .hero-actions { flex-direction: column; }
  .button { width: 100%; }
  .system-card { padding: 22px; border-radius: 22px; }
  .protocol-ring { width: 154px; height: 154px; margin: 34px auto; }
  .protocol-ring::before { width: 108px; height: 108px; font-size: 1.65rem; }
  .document-shell { padding: 54px 0 80px; }
  .document h1 { font-size: 2.8rem; }
  .document section { padding: 26px 0; }
  .support-grid { grid-template-columns: 1fr; }
  .footer-inner { padding: 28px 0; flex-direction: column; align-items: flex-start; }
}

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