:root {
  --bg: #081224;
  --surface: #ffffff;
  --surface-muted: #f5f8ff;
  --text: #1e2a3a;
  --text-light: #52637a;
  --primary: #0f6fff;
  --primary-dark: #0a54bf;
  --border: #d8e2f2;
  --shadow: 0 12px 36px rgba(8, 18, 36, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family:
    "PingFang SC",
    "Microsoft YaHei",
    "Noto Sans SC",
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  color: var(--text);
  background: #f0f4fb;
  line-height: 1.65;
}

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

.container {
  width: min(1120px, calc(100% - 2.4rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8, 18, 36, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.nav-wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 72px;
  gap: 1rem;
}

.brand {
  color: #fff;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1rem;
}

.brand-dot {
  width: 0.9rem;
  height: 0.9rem;
  border-radius: 999px;
  background: linear-gradient(135deg, #4bc1ff, #0f6fff);
  box-shadow: 0 0 0 6px rgba(79, 159, 255, 0.2);
}

.site-nav {
  display: flex;
  gap: 1.4rem;
}

.site-nav a {
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.94rem;
  transition: color 0.2s ease;
}

.site-nav a:hover {
  color: #fff;
}

.menu-toggle {
  display: none;
  border: 0;
  background: transparent;
  width: 44px;
  height: 44px;
  padding: 0;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  margin: 5px auto;
  background: #fff;
}

.hero {
  background:
    radial-gradient(circle at top right, #2557a6 0%, transparent 45%),
    linear-gradient(155deg, #081224, #102848);
  color: #fff;
  padding: 6rem 0 5rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 2rem;
  align-items: center;
}

.eyebrow {
  letter-spacing: 0.08em;
  font-size: 0.78rem;
  text-transform: uppercase;
  margin: 0 0 0.6rem;
  color: #9ec9ff;
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.9rem, 3.4vw, 3rem);
  line-height: 1.22;
}

.hero p {
  margin-top: 1rem;
  color: rgba(255, 255, 255, 0.9);
  max-width: 52ch;
}

.hero-actions {
  margin-top: 1.8rem;
  display: flex;
  gap: 0.9rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  padding: 0.72rem 1.2rem;
  font-weight: 600;
  transition: all 0.2s ease;
}

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

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

.btn-ghost {
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.12);
}

.hero-card {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 16px;
  padding: 1.3rem 1.4rem;
}

.hero-card h2 {
  margin: 0 0 0.8rem;
  font-size: 1.08rem;
}

.hero-card ul {
  margin: 0;
  padding-left: 1.1rem;
}

.section {
  padding: 4rem 0;
}

.section-muted {
  background: var(--surface-muted);
}

.section h2 {
  margin: 0;
  font-size: clamp(1.5rem, 2.2vw, 2rem);
}

.section-lead {
  margin-top: 0.9rem;
  color: var(--text-light);
  max-width: 72ch;
}

.cards {
  margin-top: 1.4rem;
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.2rem 1.1rem;
  box-shadow: var(--shadow);
}

.card h3 {
  margin: 0 0 0.6rem;
}

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

.grid-3 {
  margin-top: 1.4rem;
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.feature {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.05rem;
}

.feature h3 {
  margin-top: 0;
}

.feature p {
  margin-bottom: 0;
  color: var(--text-light);
}

.timeline {
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.7rem;
}

.timeline li {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.9rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.timeline span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2rem;
  height: 2rem;
  border-radius: 999px;
  background: #e7f0ff;
  color: var(--primary-dark);
  font-size: 0.82rem;
  font-weight: 700;
}

.contact-wrap {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 1.2rem;
  align-items: start;
}

.contact-box {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1rem 1.1rem;
}

.contact-box p {
  margin: 0.45rem 0;
}

.site-footer {
  border-top: 1px solid var(--border);
  background: #fff;
}

.footer-content {
  min-height: 68px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  color: var(--text-light);
  font-size: 0.92rem;
}

@media (max-width: 920px) {
  .hero-grid,
  .contact-wrap {
    grid-template-columns: 1fr;
  }
}

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

  .site-nav {
    position: absolute;
    top: 72px;
    right: 1rem;
    width: min(240px, calc(100% - 2rem));
    background: #0d1e37;
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: 10px;
    padding: 0.7rem;
    display: none;
    flex-direction: column;
    gap: 0.4rem;
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    display: block;
    border-radius: 8px;
    padding: 0.55rem 0.6rem;
  }

  .site-nav a:hover {
    background: rgba(255, 255, 255, 0.1);
  }
}