:root {
  color-scheme: light dark;
  --bg: #f4f7fb;
  --surface: rgba(255, 255, 255, 0.86);
  --surface-strong: #ffffff;
  --text: #172033;
  --muted: #667085;
  --line: rgba(23, 32, 51, 0.1);
  --blue: #0868e8;
  --blue-dark: #064db4;
  --orange: #ff981f;
  --shadow: 0 18px 50px rgba(23, 47, 89, 0.1);
  --radius: 22px;
}
* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 15% 0%, rgba(33, 140, 255, 0.17), transparent 31rem),
    radial-gradient(circle at 100% 12%, rgba(255, 152, 31, 0.12), transparent 26rem),
    var(--bg);
  line-height: 1.65;
}

a { color: var(--blue); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--blue-dark); }

.shell { width: min(1080px, calc(100% - 32px)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: rgba(244, 247, 251, 0.82);
  backdrop-filter: blur(20px) saturate(160%);
}

.nav { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { display: inline-flex; align-items: center; gap: 11px; color: var(--text); text-decoration: none; font-weight: 750; }
.brand-mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  color: white;
  border-radius: 10px;
  background: linear-gradient(145deg, #1f8cff, #064fc6);
  box-shadow: 0 7px 18px rgba(8, 104, 232, 0.26);
}
.brand-mark::before { content: "◫"; font-size: 21px; transform: translateY(-1px); }
.nav-links { display: flex; align-items: center; gap: 18px; font-size: 0.94rem; }
.nav-links a { color: var(--muted); text-decoration: none; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--text); }

main { padding: 74px 0 88px; }
.hero { max-width: 800px; margin-bottom: 36px; }
.eyebrow { color: var(--blue); font-size: 0.8rem; font-weight: 800; letter-spacing: 0.12em; text-transform: uppercase; }
h1 { margin: 10px 0 16px; font-size: clamp(2.35rem, 7vw, 4.5rem); line-height: 1.02; letter-spacing: -0.045em; }
.hero p { max-width: 720px; margin: 0; color: var(--muted); font-size: clamp(1.05rem, 2vw, 1.25rem); }

.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.card, .document {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}
.card { padding: 28px; }
.card h2 { margin: 0 0 8px; font-size: 1.35rem; }
.card p { margin: 0 0 22px; color: var(--muted); }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 17px;
  border-radius: 12px;
  color: #fff;
  background: var(--blue);
  font-weight: 700;
  text-decoration: none;
}
.button:hover { color: #fff; background: var(--blue-dark); }
.button.secondary { color: var(--text); background: rgba(127, 138, 160, 0.13); }
.button.secondary:hover { background: rgba(127, 138, 160, 0.2); }

.document { padding: clamp(24px, 6vw, 64px); }
.document h1 { font-size: clamp(2.15rem, 5vw, 3.6rem); }
.document h2 { margin: 2.4rem 0 0.7rem; font-size: 1.45rem; line-height: 1.3; }
.document h3 { margin: 1.65rem 0 0.4rem; font-size: 1.08rem; }
.document p, .document li { color: #3e4b62; }
.document ul, .document ol { padding-left: 1.3rem; }
.document li + li { margin-top: 0.42rem; }
.meta { margin: 0 0 2rem; color: var(--muted); font-size: 0.93rem; }
.notice {
  margin: 1.6rem 0;
  padding: 18px 20px;
  border: 1px solid rgba(8, 104, 232, 0.18);
  border-radius: 15px;
  background: rgba(8, 104, 232, 0.07);
}
.notice strong { display: block; margin-bottom: 3px; color: var(--text); }
.steps { counter-reset: support-step; list-style: none; padding: 0 !important; }
.steps li { position: relative; padding: 0 0 20px 46px; }
.steps li::before {
  counter-increment: support-step;
  content: counter(support-step);
  position: absolute;
  left: 0;
  top: 0;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  color: white;
  background: var(--blue);
  font-weight: 800;
}

.site-footer { padding: 28px 0 44px; color: var(--muted); font-size: 0.9rem; }
.footer-row { display: flex; justify-content: space-between; gap: 20px; border-top: 1px solid var(--line); padding-top: 24px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 14px; }

@media (max-width: 720px) {
  .nav { align-items: flex-start; padding: 14px 0; }
  .nav-links { flex-wrap: wrap; justify-content: flex-end; gap: 8px 14px; }
  main { padding-top: 48px; }
  .grid { grid-template-columns: 1fr; }
  .footer-row { flex-direction: column; }
}

@media (prefers-reduced-motion: no-preference) {
  .card { transition: transform 180ms ease, box-shadow 180ms ease; }
  .card:hover { transform: translateY(-3px); box-shadow: 0 23px 60px rgba(23, 47, 89, 0.14); }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1320;
    --surface: rgba(22, 31, 48, 0.87);
    --surface-strong: #161f30;
    --text: #f1f5fb;
    --muted: #aab5c8;
    --line: rgba(226, 232, 240, 0.12);
    --blue: #4aa3ff;
    --blue-dark: #79baff;
    --shadow: 0 18px 50px rgba(0, 0, 0, 0.22);
  }
  .site-header { background: rgba(13, 19, 32, 0.82); }
  .document p, .document li { color: #c7d0de; }
  .button { color: #07101f; }
  .button:hover { color: #07101f; }
}
.catalog-intro { max-width: 760px; margin-bottom: 30px; }
.catalog-intro h1 { font-size: clamp(2.3rem, 6vw, 4.2rem); }
.app-card { display: grid; grid-template-columns: auto 1fr; gap: 20px; align-items: start; }
.app-icon {
  width: 72px;
  height: 72px;
  border-radius: 18px;
  box-shadow: 0 10px 25px rgba(8, 70, 180, 0.22);
}
.app-card .card-content { min-width: 0; }
.app-card .actions { display: flex; flex-wrap: wrap; gap: 10px; }
.route-page { display: grid; min-height: 100vh; place-items: center; padding: 24px; }
.route-card { width: min(560px, 100%); text-align: center; }
.route-card h1 { font-size: clamp(2rem, 8vw, 3.4rem); }
.route-card p { color: var(--muted); }
.language-options { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 24px; }
.skip-link {
  position: absolute;
  left: 12px;
  top: -80px;
  z-index: 20;
  padding: 10px 14px;
  border-radius: 10px;
  color: white;
  background: var(--blue);
}
.skip-link:focus { top: 12px; }
code { overflow-wrap: anywhere; }
@media (max-width: 520px) {
  .app-card { grid-template-columns: 1fr; }
  .app-icon { width: 64px; height: 64px; }
}