:root {
  --primary: #2456a6;
  --primary-dark: #183d78;
  --text: #1e293b;
  --muted: #64748b;
  --light: #f4f7fb;
  --white: #ffffff;
  --border: #e2e8f0;
}

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

html {
  scroll-behavior: smooth;
}

body {
  color: var(--text);
  background: var(--white);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  line-height: 1.7;
}

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

.container {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.96);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
}

.logo {
  color: var(--primary-dark);
  font-size: 22px;
  font-weight: 700;
}

.nav-links {
  display: flex;
  gap: 34px;
}

.nav-links a {
  color: #475569;
  font-size: 15px;
}

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

.menu-button {
  display: none;
  width: 40px;
  height: 40px;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.menu-button span {
  display: block;
  width: 22px;
  height: 2px;
  margin: 5px auto;
  background: var(--text);
}

.hero {
  display: flex;
  align-items: center;
  min-height: 620px;
  background:
    linear-gradient(90deg, rgba(244, 247, 251, 0.98), rgba(244, 247, 251, 0.78)),
    radial-gradient(circle at 82% 40%, #bed4f6 0, #dce8f8 18%, transparent 42%);
}

.hero-content {
  padding: 96px 0;
}

.eyebrow {
  margin-bottom: 14px;
  color: var(--primary);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.16em;
}

h1,
h2,
h3 {
  line-height: 1.3;
}

h1 {
  max-width: 720px;
  margin-bottom: 24px;
  color: #16335e;
  font-size: clamp(44px, 6vw, 72px);
}

.hero-text {
  max-width: 650px;
  margin-bottom: 34px;
  color: var(--muted);
  font-size: 18px;
}

.button {
  display: inline-block;
  padding: 13px 30px;
  border-radius: 6px;
  color: var(--white);
  background: var(--primary);
  font-weight: 700;
  transition: background 0.2s ease;
}

.button:hover {
  background: var(--primary-dark);
}

.section {
  padding: 96px 0;
}

.section-heading {
  margin-bottom: 44px;
  text-align: center;
}

h2 {
  color: #16335e;
  font-size: clamp(30px, 4vw, 42px);
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.card {
  padding: 34px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--white);
}

.card span {
  color: var(--primary);
  font-size: 14px;
  font-weight: 700;
}

.card h3 {
  margin: 18px 0 12px;
  color: #16335e;
  font-size: 22px;
}

.card p,
.about-content > p {
  color: var(--muted);
}

.about {
  background: var(--light);
}

.about-content,
.contact-content {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  align-items: center;
  gap: 80px;
}

.about-content > p {
  font-size: 17px;
}

.contact {
  color: var(--white);
  background: var(--primary-dark);
}

.contact .eyebrow {
  color: #a8c8f8;
}

.contact h2 {
  color: var(--white);
}

.contact-list {
  display: grid;
  gap: 16px;
}

.contact-list a {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.22);
  font-size: 18px;
}

.contact-list span {
  color: #b9c9e3;
  font-size: 14px;
}

.footer {
  padding: 24px 0;
  color: #94a3b8;
  background: #10294f;
  font-size: 14px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  gap: 20px;
}

.footer a:hover {
  color: var(--white);
}

@media (max-width: 760px) {
  .menu-button {
    display: block;
  }

  .nav-links {
    position: absolute;
    top: 72px;
    right: 20px;
    left: 20px;
    display: none;
    flex-direction: column;
    gap: 0;
    padding: 10px 20px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--white);
    box-shadow: 0 12px 30px rgba(15, 23, 42, 0.12);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    padding: 12px 0;
  }

  .hero {
    min-height: 540px;
  }

  .hero-content,
  .section {
    padding: 72px 0;
  }

  .cards,
  .about-content,
  .contact-content {
    grid-template-columns: 1fr;
  }

  .about-content,
  .contact-content {
    gap: 34px;
  }

  .footer-content,
  .contact-list a {
    flex-direction: column;
  }

  .contact-list a {
    gap: 4px;
  }
}