:root {
  --navy: #112949;
  --blue: #004aad;
  --teal: #1999af;
  --bg: #ffffff;
  --bg-alt: #f5f7fa;
  --text: #1a1a1a;
  --text-light: #5a6472;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 24px;
}

a {
  color: inherit;
  text-decoration: none;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  background: var(--bg);
  border-bottom: 1px solid #eaecef;
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand-logo {
  height: 40px;
  display: block;
}

.nav {
  display: flex;
  gap: 28px;
}

.nav a {
  font-weight: 500;
  color: var(--navy);
}

.nav a:hover {
  color: var(--blue);
}

/* Hero */
.hero {
  text-align: center;
  padding: 100px 0 90px;
  background: linear-gradient(180deg, var(--bg-alt), var(--bg));
}

.hero h1 {
  font-size: 2.6rem;
  color: var(--navy);
  margin-bottom: 18px;
}

.hero-sub {
  font-size: 1.15rem;
  color: var(--text-light);
  max-width: 620px;
  margin: 0 auto 32px;
}

.btn {
  display: inline-block;
  background: var(--blue);
  color: #fff;
  padding: 12px 28px;
  border-radius: 6px;
  font-weight: 600;
  transition: background 0.2s ease;
}

.btn:hover {
  background: var(--navy);
}

/* Sections */
.section {
  padding: 72px 0;
}

.section.alt {
  background: var(--bg-alt);
}

.section h2 {
  font-size: 1.9rem;
  color: var(--navy);
  margin-bottom: 20px;
}

.section p {
  color: var(--text-light);
  max-width: 640px;
}

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 32px;
}

.card {
  background: var(--bg);
  border: 1px solid #eaecef;
  border-radius: 10px;
  padding: 28px;
}

.card h3 {
  color: var(--blue);
  margin-bottom: 10px;
  font-size: 1.2rem;
}

.card p {
  font-size: 0.95rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid #eaecef;
  padding: 24px 0;
  text-align: center;
  color: var(--text-light);
  font-size: 0.9rem;
}

@media (max-width: 640px) {
  .cards {
    grid-template-columns: 1fr;
  }
  .hero h1 {
    font-size: 2rem;
  }
  .nav {
    gap: 16px;
    font-size: 0.9rem;
  }
}