* {
  box-sizing: border-box;
}

:root {
  --bg: #f5f8fc;
  --surface: #ffffff;
  --surface-soft: #eef4ff;
  --text: #162033;
  --muted: #60708a;
  --primary: #2156d8;
  --primary-dark: #163ea2;
  --accent: #4f8cff;
  --border: rgba(22, 32, 51, 0.08);
  --shadow: 0 20px 50px rgba(18, 36, 84, 0.12);
  --radius: 20px;
  --container: 1180px;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}

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

img {
  max-width: 100%;
  display: block;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(18px);
  background: rgba(245, 248, 252, 0.88);
  border-bottom: 1px solid rgba(22, 32, 51, 0.06);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  gap: 24px;
}

.brand {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary-dark);
}

.nav-links,
.mobile-menu {
  display: flex;
  gap: 22px;
}

.nav-links a,
.mobile-menu a,
.site-footer a {
  color: var(--muted);
  transition: color 0.2s ease;
}

.nav-links a:hover,
.mobile-menu a:hover,
.site-footer a:hover,
.contact-card a:hover {
  color: var(--primary);
}

.menu-toggle {
  display: none;
  width: 46px;
  height: 46px;
  padding: 10px;
  border: 0;
  border-radius: 12px;
  background: var(--surface);
  box-shadow: 0 8px 20px rgba(22, 32, 51, 0.08);
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  height: 2px;
  margin: 6px 0;
  background: var(--text);
  border-radius: 999px;
}

.mobile-menu {
  display: none;
  flex-direction: column;
  padding: 0 20px 18px;
}

.mobile-menu.open {
  display: flex;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 92px 0 68px;
  background:
    radial-gradient(circle at top left, rgba(79, 140, 255, 0.22), transparent 34%),
    linear-gradient(180deg, #f7fbff 0%, #f3f7fc 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
  gap: 36px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--primary);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.85rem;
}

.hero h1,
.section-heading h2 {
  margin: 0;
  line-height: 1.2;
}

.hero h1 {
  font-size: clamp(2rem, 4vw, 3.5rem);
  max-width: 12ch;
}

.hero-text {
  max-width: 58ch;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 138px;
  padding: 14px 20px;
  border-radius: 999px;
  font-weight: 700;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button.primary {
  background: linear-gradient(135deg, var(--primary), #3a7dff);
  color: #fff;
  box-shadow: 0 16px 30px rgba(33, 86, 216, 0.24);
}

.button.secondary {
  background: rgba(33, 86, 216, 0.08);
  color: var(--primary);
}

.hero-card,
.panel,
.card,
.scope-card,
.scope-item,
.contact-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero-card {
  display: grid;
  gap: 16px;
  padding: 26px;
}

.stat {
  padding: 20px;
  border-radius: 16px;
  background: linear-gradient(180deg, #f7faff 0%, #eff4ff 100%);
}

.stat-value {
  display: block;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--primary-dark);
}

.stat-label {
  display: block;
  margin-top: 8px;
  color: var(--muted);
}

.section {
  padding: 88px 0;
}

.section-muted {
  background: #f0f5fb;
}

.section-dark {
  background: linear-gradient(180deg, #10203d 0%, #14284f 100%);
  color: #fff;
}

.section-heading {
  margin-bottom: 34px;
  max-width: 760px;
}

.section-heading h2 {
  font-size: clamp(1.7rem, 3vw, 2.6rem);
}

.section-heading-light .eyebrow,
.section-heading-light h2,
.section-dark .contact-card h3,
.section-dark .contact-card p,
.section-dark .contact-card a {
  color: #fff;
}

.about-grid,
.cards-grid,
.contact-grid,
.scope-layout {
  display: grid;
  gap: 24px;
}

.about-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.cards-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.panel,
.card,
.scope-card,
.scope-item,
.contact-card {
  padding: 28px;
}

.panel p,
.card p,
.scope-card p,
.scope-item p,
.contact-card p {
  margin: 12px 0 0;
  color: var(--muted);
}

.scope-layout {
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  align-items: start;
}

.scope-card-accent {
  background: linear-gradient(180deg, #f9fbff 0%, #eff5ff 100%);
}

.scope-note {
  font-weight: 600;
  color: var(--primary-dark);
}

.scope-list {
  display: grid;
  gap: 18px;
}

.contact-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.section-dark .contact-card {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.14);
  box-shadow: none;
}

.section-dark .contact-card p {
  color: rgba(255, 255, 255, 0.8);
}

.site-footer {
  background: #0d1830;
  color: rgba(255, 255, 255, 0.74);
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 0;
}

.footer-meta p {
  margin: 0;
}

.beian {
  margin-top: 6px;
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.62);
}

@media (max-width: 1080px) {
  .cards-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-grid,
  .scope-layout,
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .nav-links {
    display: none;
  }

  .menu-toggle {
    display: inline-block;
  }

  .hero {
    padding-top: 72px;
  }

  .section {
    padding: 68px 0;
  }

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

  .footer-content {
    flex-direction: column;
    align-items: flex-start;
  }
}