:root {
  color-scheme: light;
  --bg: #f7f8fb;
  --surface: #ffffff;
  --text: #18202a;
  --muted: #5f6b7a;
  --line: #dfe4ec;
  --primary: #0766F5;
  --primary-dark: #0047b3;
  --soft: #eef5ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav {
  max-width: 1040px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 750;
  color: var(--text);
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  display: grid;
  place-items: center;
  background: var(--primary);
  color: #fff;
  font-weight: 800;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 14px;
}

.hero {
  background: linear-gradient(180deg, #ffffff 0%, #f7f8fb 100%);
  border-bottom: 1px solid var(--line);
}

.hero-inner,
.page {
  max-width: 1040px;
  margin: 0 auto;
  padding: 48px 20px;
}

.hero h1,
.page h1 {
  margin: 0 0 14px;
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.05;
  letter-spacing: 0;
}

.hero p {
  max-width: 720px;
  margin: 0;
  color: var(--muted);
  font-size: 18px;
}

.actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 24px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 16px;
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  font-weight: 650;
}

.button:hover {
  color: #fff;
  background: var(--primary-dark);
  text-decoration: none;
}

.button.secondary {
  background: var(--soft);
  color: var(--primary-dark);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 20px;
}

.card h2,
.card h3,
.section h2 {
  margin-top: 0;
  line-height: 1.2;
}

.section {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 24px;
  margin: 18px 0;
}

.section ul {
  padding-left: 22px;
}

.meta {
  color: var(--muted);
  font-size: 14px;
}

.notice {
  background: var(--soft);
  border: 1px solid #c9defb;
  border-radius: 10px;
  padding: 16px;
  color: #153f73;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.footer-inner {
  max-width: 1040px;
  margin: 0 auto;
  padding: 24px 20px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 720px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero-inner,
  .page {
    padding: 34px 16px;
  }
}