:root {
  color-scheme: light;
  --navy950: #011335;
  --navy900: #031b4a;
  --blue600: #035eee;
  --blue500: #0066f8;
  --blue100: #e0edff;
  --white: #fafafa;
  --surface: #f5f7fb;
  --border: #e6eaf1;
  --gray400: #9199ad;
  --slate600: #4e5c7a;
  --green: #16a34a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--white);
  color: var(--navy950);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
}

a { color: var(--blue600); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 880px; margin: auto; padding: 24px 22px 64px; }

.nav {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  padding: 14px 0 22px;
  border-bottom: 1px solid var(--border);
  font-weight: 500;
}

.brand {
  font-size: 2.3rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--navy950);
  margin: 34px 0 4px;
}

.tagline { color: var(--slate600); font-size: 1.1rem; }

.hero { padding: 34px 0 26px; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 22px;
  margin: 16px 0;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
}

.button {
  display: inline-block;
  background: var(--blue600);
  color: #fff;
  font-weight: 600;
  padding: 12px 20px;
  border-radius: 999px;
  margin: 8px 8px 0 0;
}
.button:hover { text-decoration: none; background: var(--blue500); }

.button.secondary {
  background: transparent;
  color: var(--blue600);
  border: 1px solid var(--border);
}
.button.secondary:hover { background: var(--blue100); }

h1, h2, h3 { line-height: 1.25; letter-spacing: -0.01em; }
h1 { font-size: 2.4rem; margin: 0 0 6px; }
h2 { margin-top: 34px; font-size: 1.4rem; }
h3 { font-size: 1.1rem; margin-top: 0; }

small, .muted { color: var(--slate600); }

.notice {
  border-left: 4px solid var(--blue500);
  padding: 14px 16px;
  background: var(--blue100);
  border-radius: 10px;
  margin: 18px 0;
}

ul { padding-left: 22px; }
li { margin: 4px 0; }

footer {
  margin-top: 50px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
  color: var(--slate600);
}

@media (max-width: 600px) {
  h1 { font-size: 1.9rem; }
  .brand { font-size: 2rem; }
  .wrap { padding: 20px 18px 48px; }
}