:root {
  --ink: #16202b;
  --muted: #5b6776;
  --line: #e6e9ee;
  --accent: #3b5bdb;
  --bg: #ffffff;
  --soft: #f5f7fa;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.5;
}
.container { max-width: 960px; margin: 0 auto; padding: 0 20px; }
a { color: var(--accent); }

/* nav */
.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px; border-bottom: 1px solid var(--line); position: sticky; top: 0; background: rgba(255,255,255,.9);
  backdrop-filter: blur(6px);
}
.brand { font-weight: 800; font-size: 18px; text-decoration: none; color: var(--ink); }
.nav-links { display: flex; gap: 18px; }
.nav-links a { text-decoration: none; color: var(--muted); font-weight: 600; font-size: 15px; }
.nav-links a.active, .nav-links a:hover { color: var(--ink); }

/* jumbotron */
.jumbotron { background: linear-gradient(160deg, #eef2ff, #f7f9fc); padding: 80px 0; border-bottom: 1px solid var(--line); }
.eyebrow { text-transform: uppercase; letter-spacing: 0.08em; font-size: 12px; font-weight: 700; color: var(--accent); margin: 0 0 12px; }
.jumbotron h1 { font-size: 44px; line-height: 1.1; margin: 0 0 14px; letter-spacing: -0.02em; }
.lede { font-size: 18px; color: var(--muted); max-width: 560px; margin: 0 0 24px; }
.cta-row { display: flex; gap: 12px; flex-wrap: wrap; }
.btn { display: inline-block; padding: 11px 20px; border-radius: 9px; font-weight: 600; text-decoration: none; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-ghost { background: #fff; color: var(--ink); border: 1px solid var(--line); }

/* sections */
.section { padding: 64px 0; }
.section h2 { font-size: 30px; margin: 0 0 6px; letter-spacing: -0.01em; }
.section-sub { color: var(--muted); margin: 0 0 28px; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card { border: 1px solid var(--line); border-radius: 12px; padding: 22px; background: var(--soft); }
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); }

/* contact */
.contact-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; margin-top: 28px; }
.contact-item { border: 1px solid var(--line); border-radius: 12px; padding: 20px; }
.contact-item h3 { margin: 0 0 6px; font-size: 14px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); }
.contact-item p { margin: 0; font-size: 17px; }

.footer { border-top: 1px solid var(--line); padding: 28px 0; color: var(--muted); font-size: 14px; }

@media (max-width: 720px) {
  .jumbotron h1 { font-size: 32px; }
  .cards, .contact-grid { grid-template-columns: 1fr; }
}