:root {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --text: #182235;
  --muted: #5a677d;
  --line: #dce3ee;
  --accent: #245f9e;
  --accent-dark: #163f6d;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
}
a { color: var(--accent); }
header {
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}
.nav {
  max-width: 980px;
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 750;
  color: var(--text);
  text-decoration: none;
}
.brand img { width: 46px; height: 46px; border-radius: 12px; }
nav a {
  text-decoration: none;
  margin-left: 18px;
  font-weight: 600;
  color: var(--muted);
}
main { max-width: 980px; margin: 0 auto; padding: 54px 24px 72px; }
.hero {
  display: grid;
  grid-template-columns: 1.3fr .7fr;
  gap: 42px;
  align-items: center;
  padding: 34px 0 50px;
}
.hero img {
  width: min(260px, 100%);
  justify-self: center;
  border-radius: 28px;
  box-shadow: 0 20px 55px rgba(30, 54, 88, .12);
}
h1 { font-size: clamp(2.2rem, 6vw, 4.2rem); line-height: 1.03; margin: 0 0 18px; }
h2 { margin-top: 42px; font-size: 1.55rem; }
h3 { margin-top: 28px; }
.lead { font-size: 1.18rem; color: var(--muted); max-width: 720px; }
.badge {
  display: inline-block;
  padding: 7px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--accent-dark);
  font-weight: 700;
  font-size: .9rem;
  margin-bottom: 16px;
}
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 28px 0;
}
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px;
}
.card h3 { margin-top: 0; }
.content {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 32px;
}
code {
  background: #eef3f9;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 2px 6px;
  overflow-wrap: anywhere;
}
footer {
  border-top: 1px solid var(--line);
  background: var(--panel);
  color: var(--muted);
}
.footer-inner {
  max-width: 980px;
  margin: 0 auto;
  padding: 25px 24px;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}
.footer-inner a { margin-right: 14px; }
ul { padding-left: 22px; }
.notice {
  border-left: 4px solid var(--accent);
  background: #eef5fc;
  padding: 14px 18px;
  border-radius: 8px;
}
@media (max-width: 720px) {
  .hero { grid-template-columns: 1fr; }
  .card-grid { grid-template-columns: 1fr; }
  nav { display: none; }
}