:root {
  color-scheme: light dark;
  --bg: #f8fafc;
  --surface: #ffffff;
  --ink: #0f172a;
  --muted: #475569;
  --line: #e2e8f0;
  --primary: #2563eb;
  --primary-light: #eff6ff;
  --primary-dark: #1d4ed8;
  --accent: #3b82f6;
  --focus: #2563eb;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: radial-gradient(circle at 90% -10%, #dbeafe 0, transparent 32rem), var(--bg);
  color: var(--ink);
  font: 16px/1.65 system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}
a { color: var(--primary); text-underline-offset: .18em; }
a:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
.wrap { width: min(100% - 32px, 920px); margin: auto; }
.site-header {
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 10;
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 72px;
}
.brand {
  display: flex;
  align-items: center;
  font-weight: 850;
  letter-spacing: -.03em;
  color: var(--ink);
  text-decoration: none;
  font-size: 1.25rem;
}
.mark {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  margin-right: 10px;
  border-radius: 10px;
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  color: #ffffff;
  font-size: 20px;
  font-weight: 900;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}
.nav { display: flex; flex-wrap: wrap; align-items: center; gap: 18px; }
.nav a { font-size: .95rem; font-weight: 600; text-decoration: none; color: var(--muted); }
.nav a:hover { color: var(--primary); }
.lang-btn {
  font-size: .85rem;
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  text-decoration: none;
  color: var(--ink);
}
.hero { padding: 80px 0 48px; }
.eyebrow {
  color: var(--primary);
  font-size: .82rem;
  font-weight: 850;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.hero h1 {
  max-width: 780px;
  margin: .45rem 0 1rem;
  font-size: clamp(2.4rem, 8vw, 4.4rem);
  line-height: 1.05;
  letter-spacing: -.055em;
}
.lead { max-width: 680px; color: var(--muted); font-size: 1.22rem; }
.actions { display: flex; flex-wrap: gap; gap: 12px; margin-top: 28px; }
.button {
  display: inline-block;
  padding: 12px 24px;
  border: 1px solid var(--primary);
  border-radius: 999px;
  background: var(--primary);
  color: #ffffff;
  font-weight: 700;
  text-decoration: none;
  transition: transform .15s ease, box-shadow .15s ease;
}
.button:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.3);
}
.button.secondary { background: transparent; color: var(--primary); }
.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  padding: 32px 0 64px;
}
.card {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--surface);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.04);
}
.card h2 { margin-top: 0; font-size: 1.18rem; color: var(--ink); }
.card p { margin-bottom: 0; color: var(--muted); font-size: .96rem; }
.content { padding: 48px 0 80px; max-width: 780px; }
.content h1 { font-size: clamp(2.2rem, 6vw, 3.4rem); line-height: 1.08; letter-spacing: -.045em; }
.content h2 { margin-top: 2.2em; font-size: 1.35rem; border-bottom: 1px solid var(--line); padding-bottom: .4em; }
.content h3 { margin-top: 1.5em; font-size: 1.15rem; }
.content p, .content li { color: var(--muted); }
.notice {
  padding: 18px 20px;
  border-left: 4px solid var(--primary);
  border-radius: 10px;
  background: var(--primary-light);
  color: var(--ink);
  margin: 24px 0;
}
.meta { font-size: .9rem; color: var(--muted); margin-bottom: 24px; }
.site-footer {
  padding: 34px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .9rem;
}
.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
@media(max-width: 700px) {
  .site-header .wrap { padding-block: 12px; align-items: flex-start; flex-direction: column; }
  .hero { padding-top: 40px; }
  .grid { grid-template-columns: 1fr; }
}
@media(prefers-color-scheme: dark) {
  :root {
    --bg: #090d16;
    --surface: #0f172a;
    --ink: #f8fafc;
    --muted: #94a3b8;
    --line: #1e293b;
    --primary: #60a5fa;
    --primary-light: #1e293b;
    --primary-dark: #3b82f6;
    --focus: #93c5fd;
  }
  .card { box-shadow: none; }
}