:root {
  --ink: #1a2332;
  --ink-soft: #3d4a5c;
  --paper: #f3f6f9;
  --paper-2: #e7eef4;
  --white: #ffffff;
  --accent: #2a7a86;
  --accent-deep: #1d5f69;
  --accent-soft: rgba(42, 122, 134, 0.12);
  --muted: #5c6b7a;
  --line: rgba(26, 35, 50, 0.1);
  --shadow: 0 14px 36px rgba(26, 35, 50, 0.06);
  --radius: 18px;
  --max: 1120px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.7;
  overflow-x: hidden;
}

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

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(16px);
  background: rgba(243, 246, 249, 0.9);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  min-width: 0;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.brand-name {
  font-size: 14px;
  line-height: 1.4;
}

.nav {
  display: flex;
  gap: 28px;
  font-size: 14px;
  color: var(--ink-soft);
}

.nav a {
  position: relative;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 100%;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

.nav a:hover::after,
.nav a:focus-visible::after {
  transform: scaleX(1);
}

.menu-toggle {
  display: none;
  border: 1px solid var(--line);
  background: transparent;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 18px;
  height: 1.5px;
  margin: 4px auto;
  background: var(--ink);
}

.hero {
  position: relative;
  padding: 88px 0 96px;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 85% 0%, rgba(42, 122, 134, 0.14), transparent 48%),
    radial-gradient(ellipse at 10% 90%, rgba(120, 160, 190, 0.16), transparent 42%),
    linear-gradient(165deg, #f8fbfd 0%, #eaf1f6 55%, #e3ecf2 100%);
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero h1 {
  color: var(--ink);
  font-size: clamp(36px, 5vw, 64px);
  line-height: 1.12;
  letter-spacing: 0.06em;
  margin-bottom: 20px;
}

.hero p.lead {
  color: var(--ink-soft);
  font-size: 18px;
  max-width: 36em;
  margin-bottom: 36px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border-radius: 999px;
  font-size: 14px;
  border: 1px solid transparent;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

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

.btn-primary {
  background: var(--accent);
  color: var(--white);
  font-weight: 700;
}

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

.btn-ghost {
  border-color: rgba(26, 35, 50, 0.18);
  color: var(--ink);
  background: rgba(255, 255, 255, 0.55);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent-deep);
}

.hero-panel {
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(26, 35, 50, 0.08);
  border-radius: 24px;
  padding: 28px;
  color: var(--ink);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
}

.hero-panel h2 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 18px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

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

.stat {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.stat:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.stat span {
  color: var(--muted);
  font-size: 13px;
}

.stat strong {
  font-size: 22px;
  letter-spacing: 0.04em;
  color: var(--accent-deep);
}

.section {
  padding: 88px 0;
}

.section-head {
  max-width: 640px;
  margin-bottom: 40px;
}

.kicker {
  color: var(--accent-deep);
  font-size: 13px;
  letter-spacing: 0.16em;
  margin-bottom: 10px;
}

.section h2 {
  font-size: clamp(28px, 3.4vw, 40px);
  line-height: 1.25;
  letter-spacing: 0.04em;
  margin-bottom: 14px;
}

.section p {
  color: var(--muted);
}

.about-grid,
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: start;
}

.about-copy p + p {
  margin-top: 16px;
}

.about-card,
.contact-card,
.capability,
.solution {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.about-card {
  padding: 28px;
}

.about-card dt {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 4px;
}

.about-card dd {
  font-weight: 600;
  margin-bottom: 16px;
}

.about-card dd:last-child {
  margin-bottom: 0;
}

.capability-grid,
.solution-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.capability,
.solution {
  padding: 28px 24px;
  transition: transform 0.2s ease;
}

.capability:hover,
.solution:hover {
  transform: translateY(-4px);
}

.num {
  color: var(--accent);
  font-size: 12px;
  letter-spacing: 0.16em;
  margin-bottom: 16px;
}

.capability h3,
.solution h3,
.contact-card h3 {
  font-size: 20px;
  margin-bottom: 10px;
}

.alt {
  background: var(--paper-2);
}

.contact-card {
  padding: 28px;
}

.contact-card p {
  margin-bottom: 18px;
}

.contact-list {
  list-style: none;
  margin: 0;
  padding-top: 8px;
  border-top: 1px solid var(--line);
}

.contact-list li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  font-size: 14px;
}

.contact-list span {
  color: var(--muted);
}

.site-footer {
  background: var(--paper-2);
  color: var(--muted);
  border-top: 1px solid var(--line);
  padding: 28px 0;
  font-size: 13px;
}

.footer-inner {
  display: flex;
  justify-content: center;
  text-align: center;
  gap: 16px;
  flex-wrap: wrap;
}

.beian {
  color: var(--muted);
  text-decoration: none;
}

.beian:hover {
  color: var(--ink);
}

@media (max-width: 860px) {
  .brand {
    flex: 1;
    padding-right: 8px;
  }

  .brand-name {
    font-size: 13px;
  }

  .menu-toggle {
    display: block;
  }

  .nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(243, 246, 249, 0.98);
    border-bottom: 1px solid var(--line);
    padding: 8px 20px 16px;
  }

  .nav.open {
    display: flex;
  }

  .nav a {
    padding: 12px 0;
  }

  .hero-grid,
  .about-grid,
  .contact-grid,
  .capability-grid,
  .solution-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 56px 0 64px;
  }

  .section {
    padding: 64px 0;
  }
}