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

:root {
  --primary: #1a56db;
  --primary-dark: #1344b0;
  --text: #1f2937;
  --text-light: #6b7280;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --border: #e5e7eb;
}

html {
  scroll-behavior: smooth;
}

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

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 32px;
}

.nav-links a {
  color: var(--text);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.2s;
}

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

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 50%, #f0f9ff 100%);
  padding-top: 64px;
}

.hero-content {
  text-align: center;
  padding: 80px 24px;
}

.hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 700;
  color: var(--text);
  margin-bottom: 20px;
  line-height: 1.3;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-light);
  max-width: 560px;
  margin: 0 auto 36px;
}

.btn-primary {
  display: inline-block;
  padding: 14px 32px;
  background: var(--primary);
  color: #fff;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 500;
  transition: background 0.2s;
}

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

.section {
  padding: 80px 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section-title {
  text-align: center;
  font-size: 1.75rem;
  margin-bottom: 48px;
  color: var(--text);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.about-text p {
  color: var(--text-light);
  margin-bottom: 16px;
  font-size: 1.05rem;
}

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

.stat-item {
  text-align: center;
  padding: 24px;
  background: var(--bg-alt);
  border-radius: 12px;
  border: 1px solid var(--border);
}

.stat-num {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-light);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.service-card {
  background: var(--bg);
  padding: 32px 24px;
  border-radius: 12px;
  border: 1px solid var(--border);
  transition: box-shadow 0.2s, transform 0.2s;
}

.service-card:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}

.service-icon {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 16px;
}

.service-card h3 {
  font-size: 1.125rem;
  margin-bottom: 12px;
}

.service-card p {
  color: var(--text-light);
  font-size: 0.95rem;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  max-width: 800px;
  margin: 0 auto;
}

.contact-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 20px;
}

.contact-item strong {
  color: var(--text);
  font-size: 0.9rem;
}

.contact-item span {
  color: var(--text-light);
}

.contact-note {
  display: flex;
  align-items: center;
}

.contact-note p {
  color: var(--text-light);
  font-size: 0.95rem;
  padding: 24px;
  background: var(--bg-alt);
  border-radius: 12px;
  border-left: 4px solid var(--primary);
}

.footer {
  background: #111827;
  color: #9ca3af;
  padding: 32px 0;
  text-align: center;
}

.footer-content p {
  margin-bottom: 8px;
  font-size: 0.9rem;
}

.footer a {
  color: #9ca3af;
  text-decoration: none;
}

.footer a:hover {
  color: #fff;
}

@media (max-width: 768px) {
  .nav-links {
    gap: 16px;
    font-size: 0.85rem;
  }

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

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