:root {
  color-scheme: light;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #172033;
  background: #f4f7fb;
  line-height: 1.65;
}

* { box-sizing: border-box; }

body { margin: 0; }

a { color: #1769e8; }

.shell {
  width: min(880px, calc(100% - 32px));
  margin: 0 auto;
}

header {
  padding: 48px 0 28px;
  background: linear-gradient(145deg, #0f2552, #1769e8);
  color: #fff;
}

header p { color: #dce9ff; }

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 28px;
}

nav a { color: #fff; }

main {
  margin: 28px auto 56px;
  padding: 32px clamp(20px, 5vw, 56px);
  background: #fff;
  border: 1px solid #e3e9f2;
  border-radius: 18px;
  box-shadow: 0 18px 45px rgba(24, 45, 84, .08);
}

h1 { margin: 0 0 8px; font-size: clamp(2rem, 6vw, 3rem); line-height: 1.15; }
h2 { margin-top: 2.2rem; color: #10254f; }
h3 { margin-top: 1.5rem; color: #173666; }
p, li { color: #3a4659; }
li + li { margin-top: .45rem; }
.meta { margin: 0; font-size: .95rem; }
.notice {
  padding: 16px 18px;
  border-left: 4px solid #1769e8;
  border-radius: 8px;
  background: #f0f6ff;
}
.contact {
  padding: 18px;
  border-radius: 12px;
  background: #f7f9fc;
}
footer { padding: 0 16px 40px; text-align: center; color: #667085; }

@media (max-width: 600px) {
  header { padding-top: 32px; }
  main { margin-top: 16px; padding: 24px 20px; border-radius: 14px; }
}