:root {
  --bg: #F6F9FF;
  --card: rgba(255,255,255,.88);
  --text: #0A2857;
  --muted: #6E819F;
  --blue: #1689FF;
  --blue-2: #63B3FF;
  --line: rgba(22,137,255,.12);
  --shadow: 0 18px 50px rgba(24, 77, 140, .08);
  --max: 860px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 85% 10%, rgba(74,163,255,.12), transparent 30%),
    radial-gradient(circle at 10% 90%, rgba(74,163,255,.10), transparent 28%),
    var(--bg);
  color: var(--text);
  line-height: 1.65;
}

.wrap {
  width: min(calc(100% - 32px), var(--max));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  background: rgba(246,249,255,.82);
  border-bottom: 1px solid var(--line);
}

.nav {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text);
  text-decoration: none;
  font-size: 1.15rem;
}

.navlinks { display: flex; gap: 10px; flex-wrap: wrap; }

.navlinks a {
  text-decoration: none;
  color: var(--muted);
  padding: 8px 12px;
  border-radius: 999px;
}

.navlinks a:hover,
.navlinks a.active {
  color: var(--blue);
  background: rgba(22,137,255,.08);
}

.langs {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  margin-left: 4px;
  padding-left: 10px;
  border-left: 1px solid var(--line);
}

.langs a {
  font-size: .82rem;
  font-weight: 800;
  letter-spacing: .04em;
}

.hero {
  padding: 56px 0 26px;
}

.hero-card {
  position: relative;
  overflow: hidden;
  padding: 34px;
  background: linear-gradient(135deg, rgba(255,255,255,.96), rgba(235,245,255,.92));
  border: 1px solid var(--line);
  border-radius: 30px;
  box-shadow: var(--shadow);
}

.hero-card:after {
  content: "";
  position: absolute;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  right: -80px;
  top: -90px;
  background: radial-gradient(circle, rgba(22,137,255,.18), rgba(22,137,255,0));
}

.kicker {
  color: var(--blue);
  text-transform: uppercase;
  font-size: .78rem;
  letter-spacing: .13em;
  font-weight: 800;
}

h1 {
  font-size: clamp(2.2rem, 5vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
  margin: 10px 0 12px;
}

.updated {
  color: var(--muted);
  margin: 0;
}

.intro {
  margin-top: 22px;
  max-width: 700px;
  color: var(--muted);
  font-size: 1.05rem;
}

main { padding: 12px 0 64px; }

.section {
  margin: 18px 0;
  padding: 28px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: 0 12px 36px rgba(24,77,140,.05);
}

.section h2 {
  margin: 0 0 14px;
  font-size: 1.45rem;
  letter-spacing: -0.02em;
}

.section h3 {
  margin: 20px 0 8px;
  font-size: 1.05rem;
}

p { margin: 10px 0; }

ul {
  margin: 10px 0 12px;
  padding-left: 22px;
}

li { margin: 6px 0; }

.notice {
  padding: 16px 18px;
  border-radius: 18px;
  background: rgba(22,137,255,.07);
  border: 1px solid rgba(22,137,255,.10);
  color: var(--muted);
}

.contact {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--blue);
  color: white;
  text-decoration: none;
  font-weight: 700;
}

.footer {
  padding: 10px 0 50px;
  color: var(--muted);
  text-align: center;
  font-size: .9rem;
}

.lang-note {
  font-size: .9rem;
  color: var(--muted);
}

@media (max-width: 640px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 14px 0;
  }

  .hero { padding-top: 28px; }

  .hero-card,
  .section {
    border-radius: 22px;
    padding: 22px;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #07111F;
    --card: rgba(12, 25, 44, .88);
    --text: #F3F7FF;
    --muted: #9AB0CC;
    --line: rgba(102,176,255,.14);
    --shadow: 0 18px 50px rgba(0,0,0,.22);
  }

  body {
    background:
      radial-gradient(circle at 85% 10%, rgba(22,137,255,.15), transparent 30%),
      radial-gradient(circle at 10% 90%, rgba(22,137,255,.10), transparent 28%),
      var(--bg);
  }

  .topbar { background: rgba(7,17,31,.80); }

  .hero-card {
    background: linear-gradient(135deg, rgba(15,31,54,.96), rgba(9,22,39,.92));
  }
}