/* === 基础重置 === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  line-height: 1.6; color: #1a1a2e; background: #fff;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
.container { max-width: 1140px; margin: 0 auto; padding: 0 20px; }

/* === 导航栏 === */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,0.95); backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(0,0,0,0.06);
  transition: box-shadow 0.3s;
}
.navbar.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,0.08); }
.nav-container { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; gap: 8px; }
.logo-icon { font-size: 1.6rem; }
.logo-text { font-size: 1.1rem; font-weight: 700; color: #16213e; }
.nav-links { display: flex; gap: 32px; }
.nav-links a { font-size: 0.9rem; color: #555; transition: color 0.2s; font-weight: 500; }
.nav-links a:hover { color: #0f3460; }
.nav-toggle { display: none; background: none; border: none; font-size: 1.5rem; cursor: pointer; }

/* === Hero === */
.hero {
  position: relative; min-height: 100vh; display: flex; align-items: center;
  background: linear-gradient(135deg, #0f3460 0%, #16213e 60%, #1a1a2e 100%);
  overflow: hidden;
}
.hero-overlay {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(83, 157, 232, 0.15) 0%, transparent 70%);
}
.hero-content { position: relative; color: #fff; padding: 120px 0 80px; }
.hero-content h1 { font-size: 3rem; font-weight: 800; line-height: 1.3; margin-bottom: 16px; }
.highlight { color: #53a8e8; }
.hero-subtitle { font-size: 1.15rem; color: rgba(255,255,255,0.75); margin-bottom: 36px; max-width: 560px; }
.hero-cta { display: flex; gap: 16px; margin-bottom: 60px; }
.btn {
  display: inline-block; padding: 12px 32px; border-radius: 8px;
  font-size: 0.95rem; font-weight: 600; cursor: pointer; transition: all 0.2s;
}
.btn-primary { background: #53a8e8; color: #fff; border: none; }
.btn-primary:hover { background: #3d8fd4; transform: translateY(-2px); }
.btn-outline { background: transparent; color: #fff; border: 1.5px solid rgba(255,255,255,0.4); }
.btn-outline:hover { border-color: #fff; background: rgba(255,255,255,0.1); }
.hero-stats { display: flex; gap: 48px; }
.stat-item { }
.stat-number { font-size: 2.2rem; font-weight: 800; color: #53a8e8; }
.stat-label { font-size: 0.85rem; color: rgba(255,255,255,0.6); margin-top: 4px; }

/* === Section Common === */
.section { padding: 100px 0; }
.section-alt { background: #f7f9fc; }
.section-dark { background: #16213e; color: #fff; }
.section-title { text-align: center; font-size: 2rem; font-weight: 800; margin-bottom: 8px; }
.section-title-light { color: #fff; }
.section-subtitle { text-align: center; color: #666; font-size: 1rem; margin-bottom: 56px; }
.section-subtitle-light { color: rgba(255,255,255,0.6); }

/* === About === */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-text p { color: #555; margin-bottom: 20px; font-size: 0.98rem; line-height: 1.8; }
.about-highlights { display: flex; gap: 24px; margin-top: 32px; }
.highlight-item { display: flex; align-items: center; gap: 8px; font-weight: 600; color: #16213e; }
.highlight-icon { font-size: 1.3rem; }
.about-card {
  background: linear-gradient(135deg, #f7f9fc, #eef2f8);
  border-radius: 16px; padding: 48px 40px; text-align: center;
}
.about-card-icon { font-size: 3rem; margin-bottom: 16px; }
.about-card h3 { font-size: 1.3rem; margin-bottom: 12px; color: #16213e; }
.about-card p { color: #666; font-size: 0.95rem; }

/* === Services === */
.services-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.service-card {
  background: #fff; border-radius: 16px; padding: 40px 32px;
  border: 1px solid rgba(0,0,0,0.06); transition: transform 0.3s, box-shadow 0.3s;
}
.service-card:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,0.08); }
.service-icon { font-size: 2.5rem; margin-bottom: 20px; }
.service-card h3 { font-size: 1.2rem; margin-bottom: 12px; color: #16213e; }
.service-card p { color: #666; font-size: 0.92rem; line-height: 1.7; margin-bottom: 20px; }
.service-features { display: flex; flex-wrap: wrap; gap: 8px; }
.service-features li {
  background: #f0f4ff; color: #0f3460; padding: 4px 12px;
  border-radius: 20px; font-size: 0.8rem; font-weight: 500;
}

/* === Pricing === */
.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; align-items: start; }
.pricing-card {
  background: #fff; border-radius: 16px; overflow: hidden;
  border: 1px solid rgba(0,0,0,0.08); transition: transform 0.3s;
  position: relative;
}
.pricing-card:hover { transform: translateY(-4px); }
.pricing-card.featured { border: 2px solid #53a8e8; transform: scale(1.04); }
.pricing-card.featured:hover { transform: scale(1.06); }
.pricing-badge {
  position: absolute; top: 16px; right: -32px;
  background: #53a8e8; color: #fff; padding: 4px 40px;
  font-size: 0.75rem; font-weight: 600; transform: rotate(45deg);
}
.pricing-header {
  padding: 32px 28px 20px; border-bottom: 1px solid rgba(0,0,0,0.06);
  text-align: center;
}
.pricing-header h3 { font-size: 1.2rem; margin-bottom: 4px; }
.pricing-desc { color: #888; font-size: 0.85rem; }
.pricing-body { padding: 24px 28px 32px; }
.pricing-body ul { margin-bottom: 16px; }
.pricing-body li {
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 0; border-bottom: 1px solid rgba(0,0,0,0.04);
  font-size: 0.9rem;
}
.flow { color: #333; font-weight: 500; }
.price { color: #0f3460; font-weight: 600; }
.pricing-note { color: #999; font-size: 0.78rem; font-style: italic; }

/* === Contact === */
.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.contact-card {
  background: rgba(255,255,255,0.06); border-radius: 16px; padding: 40px 28px;
  text-align: center; border: 1px solid rgba(255,255,255,0.1);
}
.contact-icon { font-size: 2.5rem; margin-bottom: 16px; }
.contact-card h3 { font-size: 1.1rem; margin-bottom: 16px; }
.contact-card p { color: rgba(255,255,255,0.7); font-size: 0.9rem; margin-bottom: 8px; }
.qr-placeholder {
  margin-top: 16px; padding: 24px; background: rgba(255,255,255,0.08);
  border-radius: 8px; color: rgba(255,255,255,0.5); font-size: 0.85rem;
}

/* === Footer === */
.footer { background: #0d1a2e; padding: 48px 0 24px; }
.footer-content { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 32px; }
.footer-brand .logo-text { color: #fff; font-size: 1.1rem; font-weight: 700; }
.footer-brand p { color: rgba(255,255,255,0.5); font-size: 0.85rem; margin-top: 8px; }
.footer-links { display: flex; gap: 24px; }
.footer-links a { color: rgba(255,255,255,0.6); font-size: 0.88rem; transition: color 0.2s; }
.footer-links a:hover { color: #53a8e8; }
.footer-bottom { text-align: center; padding-top: 24px; border-top: 1px solid rgba(255,255,255,0.08); }
.footer-bottom p { color: rgba(255,255,255,0.35); font-size: 0.8rem; }

/* === 响应式 === */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-toggle { display: block; }
  .nav-links.active {
    display: flex; flex-direction: column; position: absolute;
    top: 64px; left: 0; right: 0; background: #fff;
    padding: 20px; gap: 16px; box-shadow: 0 8px 20px rgba(0,0,0,0.1);
  }
  .hero-content h1 { font-size: 2rem; }
  .hero-stats { flex-wrap: wrap; gap: 24px; }
  .about-grid { grid-template-columns: 1fr; gap: 32px; }
  .services-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .pricing-card.featured { transform: scale(1); }
  .pricing-card.featured:hover { transform: translateY(-4px); }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-content { flex-direction: column; gap: 24px; }
  .section { padding: 64px 0; }
}