:root {
  --bg: #f7f9fc;
  --surface: #ffffff;
  --text: #1f2a37;
  --muted: #5b6574;
  --primary: #1677ff;
  --primary-dark: #0f5fd1;
  --border: #e5eaf2;
  --shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

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

.container {
  width: min(1100px, 92vw);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.95);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
}

.nav {
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}

nav {
  display: flex;
  gap: 22px;
  color: var(--muted);
  font-size: 0.95rem;
}

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

.hero {
  padding: 86px 0 70px;
  background: linear-gradient(160deg, #eef4ff 0%, #f8fbff 55%, #ffffff 100%);
}

.hero-tag {
  margin: 0 0 12px;
  color: var(--primary);
  font-weight: 600;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.2;
}

.hero-desc {
  max-width: 760px;
  margin: 18px 0 28px;
  color: var(--muted);
}

.hero-actions {
  display: flex;
  gap: 14px;
}

.btn {
  display: inline-block;
  padding: 11px 22px;
  border-radius: 10px;
  border: 1px solid transparent;
  font-weight: 600;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

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

.btn-secondary {
  background: #fff;
  border-color: var(--border);
}

.section {
  padding: 68px 0;
}

.section-alt {
  background: #fff;
  border-block: 1px solid var(--border);
}

h2 {
  margin: 0 0 8px;
  font-size: 1.7rem;
}

.section-intro {
  margin: 0 0 30px;
  color: var(--muted);
}

.cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px;
  box-shadow: var(--shadow);
}

.card h3 {
  margin: 0 0 8px;
}

.card p {
  margin: 0;
  color: var(--muted);
}

.steps {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
}

.step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 14px;
  font-weight: 600;
}

.step span {
  display: inline-block;
  margin-right: 8px;
  color: var(--primary);
}

.about {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 30px;
  align-items: start;
}

.about p {
  margin: 0;
  color: var(--muted);
}

.about ul {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}

.about li + li {
  margin-top: 10px;
}

.site-footer {
  background: #0f172a;
  color: #d8e2f1;
  padding: 56px 0 24px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  gap: 30px;
}

.site-footer h2 {
  margin-bottom: 6px;
  color: #fff;
}

.site-footer p {
  margin: 0;
}

.contact-list {
  display: grid;
  gap: 8px;
}

.copyright {
  width: min(1100px, 92vw);
  margin: 24px auto 0;
  padding-top: 16px;
  border-top: 1px solid rgba(216, 226, 241, 0.25);
  font-size: 0.9rem;
  color: #a6b4ca;
}

@media (max-width: 860px) {
  nav {
    display: none;
  }

  .cards,
  .steps,
  .about,
  .footer-content {
    grid-template-columns: 1fr;
    display: grid;
  }

  .hero {
    padding-top: 64px;
  }
}