:root {
  color-scheme: dark;
  --bg: #07111f;
  --panel: rgba(10, 30, 48, 0.86);
  --panel-strong: #0c2539;
  --line: rgba(82, 221, 214, 0.24);
  --text: #f7fbff;
  --muted: #b7c9d8;
  --accent: #2bd5cc;
  --accent-2: #7cdfff;
  --gold: #ffd45d;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.68;
  color: var(--text);
  background:
    radial-gradient(circle at 18% 5%, rgba(32, 141, 201, 0.34), transparent 34rem),
    radial-gradient(circle at 90% 15%, rgba(43, 213, 204, 0.18), transparent 26rem),
    linear-gradient(155deg, #07111f 0%, #0a1b2b 50%, #06101b 100%);
}

a { color: var(--accent-2); }
a:hover { color: #fff; }

.shell {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
}

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 22px 0;
}

.brand {
  color: #fff;
  font-weight: 850;
  letter-spacing: -0.03em;
  text-decoration: none;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 16px;
  font-size: 0.92rem;
}

.nav-links a { color: var(--muted); text-decoration: none; }

.language-switch {
  display: inline-flex;
  align-items: center;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(4, 15, 26, 0.52);
}

.language-switch button {
  min-height: 34px;
  padding: 5px 10px;
  border: 0;
  border-radius: 999px;
  color: var(--muted);
  background: transparent;
  font: inherit;
  font-size: 0.76rem;
  font-weight: 750;
  cursor: pointer;
}

.language-switch button:hover { color: #fff; }

.language-switch button[aria-pressed="true"] {
  color: #04191e;
  background: var(--accent);
}

.language-switch button:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 2px;
}

.hero {
  display: grid;
  grid-template-columns: 180px 1fr;
  align-items: center;
  gap: 46px;
  padding: 68px 0 58px;
}

.app-icon {
  width: 180px;
  height: 180px;
  display: block;
  object-fit: cover;
  border-radius: 38px;
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(255, 255, 255, 0.18);
}

.eyebrow {
  color: var(--accent);
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  margin: 8px 0 12px;
  font-size: clamp(2.35rem, 8vw, 4.8rem);
  line-height: 1.04;
  letter-spacing: -0.055em;
}

.lead {
  max-width: 680px;
  margin: 0;
  color: var(--muted);
  font-size: 1.14rem;
}

.badge {
  display: inline-flex;
  margin-top: 24px;
  padding: 10px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--gold);
  background: rgba(8, 25, 40, 0.74);
  font-weight: 750;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  padding: 14px 0 72px;
}

.card, .document {
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.22);
  backdrop-filter: blur(14px);
}

.card {
  padding: 24px;
  border-radius: 22px;
}

.card h2 { margin: 0 0 8px; font-size: 1.08rem; }
.card p { margin: 0; color: var(--muted); }

.document {
  max-width: 820px;
  margin: 46px auto 72px;
  padding: clamp(24px, 6vw, 58px);
  border-radius: 28px;
}

.document h1 { font-size: clamp(2rem, 6vw, 3.35rem); }
.document h2 { margin: 2.1rem 0 0.7rem; font-size: 1.25rem; }
.document h3 { margin: 1.35rem 0 0.5rem; font-size: 1rem; color: var(--accent); }
.document p, .document li { color: var(--muted); }
.document strong { color: var(--text); }
.document ul { padding-left: 1.25rem; }
.document li { margin: 0.5rem 0; }

.meta {
  margin-bottom: 2rem;
  color: var(--accent);
  font-weight: 750;
}

.notice {
  margin: 1.3rem 0;
  padding: 16px 18px;
  border-left: 4px solid var(--accent);
  border-radius: 12px;
  background: var(--panel-strong);
}

.language-divider {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 3.5rem 0;
}

footer {
  padding: 26px 0 42px;
  border-top: 1px solid var(--line);
  color: #91a8ba;
  font-size: 0.88rem;
}

footer .shell {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

@media (max-width: 720px) {
  nav { align-items: flex-start; flex-wrap: wrap; }
  .nav-links { flex: 1 1 auto; }
  .language-switch { margin-left: auto; }
  .hero { grid-template-columns: 1fr; gap: 28px; padding-top: 42px; }
  .app-icon { width: 132px; height: 132px; border-radius: 29px; }
  .grid { grid-template-columns: 1fr; }
  .document { margin-top: 22px; }
}

@media (max-width: 460px) {
  .nav-links { order: 3; width: 100%; justify-content: flex-start; }
  .language-switch button { padding-inline: 8px; font-size: 0.72rem; }
}