* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", Roboto, "Helvetica Neue", Arial, sans-serif; font-size: 15px; line-height: 1.7; color: #333; background: #fff; }
a { color: #165DFF; text-decoration: none; transition: color 0.2s; }
a:hover { color: #0E42C2; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header { background: #fff; box-shadow: 0 1px 3px rgba(0,0,0,0.08); position: sticky; top: 0; z-index: 100; }
.top-bar { background: #f5f7fa; border-bottom: 1px solid #eaecef; font-size: 13px; color: #666; }
.top-bar .container { display: flex; justify-content: space-between; align-items: center; height: 36px; }
.top-bar a { color: #666; margin-left: 20px; }
.top-bar a:hover { color: #165DFF; }
.top-contact a { color: #165DFF; font-weight: 500; margin-left: 4px; }
.main-header { padding: 16px 0; }
.header-flex { display: flex; justify-content: space-between; align-items: center; }
.logo { display: flex; align-items: center; gap: 8px; font-size: 22px; font-weight: 700; color: #1d2129; }
.logo-mark { color: #165DFF; font-size: 24px; }
.main-nav ul { display: flex; align-items: center; gap: 4px; }
.main-nav a { display: block; padding: 8px 16px; color: #333; font-size: 15px; border-radius: 4px; }
.main-nav a:hover { color: #165DFF; background: #f0f5ff; }
.main-nav a.nav-btn { background: #165DFF; color: #fff; padding: 8px 20px; margin-left: 8px; }
.main-nav a.nav-btn:hover { background: #0E42C2; color: #fff; }
.menu-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.menu-toggle span { display: block; width: 24px; height: 2px; background: #333; margin: 5px 0; transition: 0.3s; }

/* Hero */
.hero { padding: 60px 0; background: linear-gradient(135deg, #f0f5ff 0%, #e6f0ff 100%); }
.hero-flex { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }
.hero h1 { font-size: 38px; font-weight: 700; line-height: 1.3; color: #1d2129; margin-bottom: 20px; }
.hero p { font-size: 17px; color: #4e5969; margin-bottom: 30px; line-height: 1.8; }
.hero-ctas { display: flex; gap: 12px; margin-bottom: 24px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 12px 28px; border-radius: 4px; font-size: 15px; font-weight: 500; cursor: pointer; border: none; transition: all 0.2s; }
.btn-primary { background: #165DFF; color: #fff; }
.btn-primary:hover { background: #0E42C2; color: #fff; }
.btn-secondary { background: #fff; color: #165DFF; border: 1px solid #165DFF; }
.btn-secondary:hover { background: #f0f5ff; }
.btn-outline { background: transparent; color: #333; border: 1px solid #c9cdd4; }
.btn-outline:hover { border-color: #165DFF; color: #165DFF; }
.btn-lg { padding: 14px 36px; font-size: 16px; }
.w-full { width: 100%; }
.hero-tags { display: flex; gap: 24px; flex-wrap: wrap; font-size: 14px; color: #4e5969; }
.hero-image img { border-radius: 8px; box-shadow: 0 10px 40px rgba(22,93,255,0.15); }

/* Section */
.section { padding: 70px 0; }
.section-header { text-align: center; margin-bottom: 50px; }
.section-header.center { margin-bottom: 40px; }
.section-header h2 { font-size: 32px; font-weight: 700; color: #1d2129; margin-bottom: 12px; }
.section-header p { font-size: 16px; color: #86909c; }

/* Platforms */
.platform-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 20px; }
.platform-card { background: #fff; border: 1px solid #eaecef; border-radius: 8px; padding: 28px 20px; text-align: center; transition: all 0.3s; color: #333; }
.platform-card:hover { border-color: #165DFF; box-shadow: 0 8px 24px rgba(22,93,255,0.1); transform: translateY(-4px); }
.platform-icon { width: 56px; height: 56px; background: linear-gradient(135deg, #165DFF, #4080FF); border-radius: 12px; color: #fff; font-size: 24px; font-weight: 700; display: flex; align-items: center; justify-content: center; margin: 0 auto 16px; }
.platform-card h3 { font-size: 17px; margin-bottom: 8px; color: #1d2129; }
.platform-card p { font-size: 13px; color: #86909c; line-height: 1.6; }

/* Services */
.services-section { background: #f7f8fa; }
.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.service-card { background: #fff; border-radius: 8px; padding: 32px; border: 1px solid #eaecef; transition: all 0.3s; position: relative; overflow: hidden; }
.service-card:hover { box-shadow: 0 12px 32px rgba(0,0,0,0.08); transform: translateY(-4px); }
.service-card.featured { border-color: #165DFF; }
.service-card.featured::before { content: "推荐"; position: absolute; top: 16px; right: 16px; background: #165DFF; color: #fff; font-size: 12px; padding: 2px 10px; border-radius: 4px; }
.service-num { font-size: 36px; font-weight: 700; color: #e8f3ff; margin-bottom: 12px; }
.service-card h3 { font-size: 20px; color: #1d2129; margin-bottom: 12px; }
.service-card > p { font-size: 14px; color: #4e5969; margin-bottom: 20px; line-height: 1.7; min-height: 72px; }
.service-list { margin-bottom: 24px; }
.service-list li { padding: 6px 0; font-size: 14px; color: #4e5969; padding-left: 20px; position: relative; }
.service-list li::before { content: "✓"; position: absolute; left: 0; color: #00b42a; font-weight: 700; }
.service-meta { display: flex; justify-content: space-between; align-items: center; padding-top: 20px; border-top: 1px solid #f2f3f5; }
.price { font-size: 18px; font-weight: 700; color: #f53f3f; }
.btn-link { font-weight: 500; }

/* Advantages */
.advantages-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; }
.advantage-item { text-align: center; }
.advantage-icon { width: 72px; height: 72px; background: #f0f5ff; border-radius: 50%; color: #165DFF; font-size: 28px; font-weight: 700; display: flex; align-items: center; justify-content: center; margin: 0 auto 20px; }
.advantage-item h3 { font-size: 18px; color: #1d2129; margin-bottom: 10px; }
.advantage-item p { font-size: 14px; color: #4e5969; line-height: 1.7; }

/* Process */
.process-section { background: #f7f8fa; }
.process-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; position: relative; }
.process-steps::before { content: ""; position: absolute; top: 36px; left: 10%; right: 10%; height: 2px; background: #d0e0ff; z-index: 0; }
.process-step { text-align: center; position: relative; z-index: 1; background: #f7f8fa; padding: 0 10px; }
.step-number { width: 72px; height: 72px; background: #fff; border: 3px solid #165DFF; border-radius: 50%; font-size: 28px; font-weight: 700; color: #165DFF; display: flex; align-items: center; justify-content: center; margin: 0 auto 20px; }
.process-step h3 { font-size: 18px; color: #1d2129; margin-bottom: 10px; }
.process-step p { font-size: 14px; color: #4e5969; line-height: 1.7; }

/* News */
.news-section { background: #fff; }
.news-more { text-align: center; margin-top: 40px; }
ul.article-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 20px; list-style: none; margin: 0; padding: 0; width: 100%; box-sizing: border-box; }
ul.article-cards > li.article-card { min-width: 0; width: auto; max-width: none; margin: 0; float: none; box-sizing: border-box; background: #fff; border: 1px solid #eaecef; border-radius: 8px; overflow: hidden; transition: all 0.3s; }
ul.article-cards > li.article-card:hover { box-shadow: 0 8px 24px rgba(0,0,0,0.08); transform: translateY(-4px); }
.article-card .card-thumb { width: 100%; overflow: hidden; aspect-ratio: 16/9; }
.article-card .card-thumb img { display: block; width: 100%; max-width: 100%; height: 100%; object-fit: cover; transition: transform 0.3s; }
.article-card:hover .card-thumb img { transform: scale(1.05); }
.article-card .card-body { padding: 20px; }
.article-card .card-title { overflow-wrap: anywhere; font-size: 16px; font-weight: 600; color: #1d2129; margin-bottom: 10px; line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.article-card .card-title a { color: #1d2129; }
.article-card .card-title a:hover { color: #165DFF; }
.article-card .card-date { display: block; font-size: 13px; color: #86909c; margin-bottom: 8px; }
.article-card .card-summary { overflow-wrap: anywhere; font-size: 14px; color: #4e5969; line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

/* FAQ */
.faq-section { background: #f7f8fa; }
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { background: #fff; border-radius: 8px; margin-bottom: 12px; border: 1px solid #eaecef; overflow: hidden; }
.faq-q { padding: 20px 24px; font-size: 16px; font-weight: 600; color: #1d2129; cursor: pointer; position: relative; }
.faq-q::after { content: "+"; position: absolute; right: 24px; top: 50%; transform: translateY(-50%); font-size: 20px; color: #165DFF; transition: transform 0.3s; }
.faq-item.active .faq-q::after { content: "−"; }
.faq-a { padding: 0 24px; max-height: 0; overflow: hidden; font-size: 14px; color: #4e5969; line-height: 1.8; transition: all 0.3s; }
.faq-item.active .faq-a { padding: 0 24px 20px; max-height: 500px; }

/* About */
.about-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 50px; align-items: start; }
.about-content h2 { font-size: 32px; color: #1d2129; margin-bottom: 24px; }
.about-content p { font-size: 15px; color: #4e5969; margin-bottom: 16px; line-height: 1.8; }
.about-content .btn { margin-top: 16px; }
.contact-card { background: #f7f8fa; border-radius: 8px; padding: 30px; border: 1px solid #eaecef; }
.contact-card h3 { font-size: 20px; color: #1d2129; margin-bottom: 20px; }
.contact-item { padding: 10px 0; font-size: 14px; color: #4e5969; border-bottom: 1px solid #eaecef; }
.contact-item:last-of-type { border-bottom: none; margin-bottom: 20px; }
.contact-item a { color: #165DFF; font-weight: 600; }

/* Apply Form */
.apply-section { background: #f7f8fa; }
.apply-form-wrap { max-width: 800px; margin: 0 auto; background: #fff; padding: 40px; border-radius: 8px; box-shadow: 0 4px 20px rgba(0,0,0,0.06); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 20px; }
.form-group { display: flex; flex-direction: column; }
.form-group.full { grid-column: 1 / -1; margin-bottom: 20px; }
.form-group label { font-size: 14px; font-weight: 500; color: #1d2129; margin-bottom: 8px; }
.form-group input, .form-group select, .form-group textarea { padding: 12px 16px; border: 1px solid #c9cdd4; border-radius: 4px; font-size: 15px; font-family: inherit; transition: border-color 0.2s; }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: #165DFF; }
.form-group textarea { resize: vertical; }
.form-submit { text-align: center; }
.form-tip { margin-top: 12px; font-size: 13px; color: #86909c; }

/* Article Detail */
.breadcrumb-wrap { padding: 16px 0; background: #f7f8fa; border-bottom: 1px solid #eaecef; font-size: 14px; color: #86909c; }
.breadcrumb-wrap a { color: #4e5969; }
.breadcrumb-wrap a:hover { color: #165DFF; }
.article-detail { padding: 40px 0 80px; }
.article-main { max-width: 800px; margin: 0 auto; }
.article-header { margin-bottom: 30px; text-align: center; }
.article-header h1 { font-size: 32px; font-weight: 700; color: #1d2129; line-height: 1.4; margin-bottom: 20px; }
.article-meta { font-size: 14px; color: #86909c; margin-bottom: 20px; }
.article-meta span { margin: 0 10px; }
.article-date { display: none; }
.article-summary { font-size: 16px; color: #4e5969; padding: 20px; background: #f7f8fa; border-left: 4px solid #165DFF; text-align: left; line-height: 1.8; border-radius: 0 4px 4px 0; }
.article-cover { margin-bottom: 30px; border-radius: 8px; overflow: hidden; }
.article-cover img { width: 100%; }
.article-content { font-size: 16px; line-height: 1.9; color: #333; margin-bottom: 40px; }
.article-content p { margin-bottom: 20px; }
.article-content h2, .article-content h3 { margin: 30px 0 15px; color: #1d2129; }
.article-content h2 { font-size: 24px; }
.article-content h3 { font-size: 20px; }
.article-content img { border-radius: 4px; margin: 20px 0; }
.article-footer { padding: 40px 0; border-top: 1px solid #eaecef; }
.article-contact { text-align: center; padding: 40px; background: #f0f5ff; border-radius: 8px; }
.article-contact h4 { font-size: 20px; color: #1d2129; margin-bottom: 10px; }
.article-contact p { color: #4e5969; margin-bottom: 24px; }
.article-contact .btn { margin: 0 8px; }

/* Footer */
.site-footer { background: #1d2129; color: #c9cdd4; }
.footer-main { padding: 60px 0 40px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 40px; }
.footer-logo { font-size: 22px; font-weight: 700; color: #fff; margin-bottom: 20px; }
.footer-about p { font-size: 14px; line-height: 1.8; margin-bottom: 12px; }
.footer-about a { color: #fff; }
.footer-col h4 { font-size: 16px; color: #fff; margin-bottom: 20px; font-weight: 600; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { color: #c9cdd4; font-size: 14px; }
.footer-col ul li a:hover { color: #fff; }
.friend-links { font-size: 13px; line-height: 2; }
.friend-links a { color: #86909c; margin-right: 12px; }
.friend-links a:hover { color: #fff; }
.footer-copyright { padding: 20px 0; border-top: 1px solid #2e343e; font-size: 13px; text-align: center; color: #86909c; }
.footer-copyright a { color: #86909c; }
.footer-copyright a:hover { color: #fff; }

/* Responsive */
@media (max-width: 992px) {
  .platform-grid { grid-template-columns: repeat(3, 1fr); }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .advantages-grid { grid-template-columns: repeat(2, 1fr); gap: 30px; }
  .process-steps { grid-template-columns: repeat(2, 1fr); gap: 30px; }
  .process-steps::before { display: none; }
  .hero-flex { grid-template-columns: 1fr; gap: 40px; }
  .about-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 30px; }
}
@media (max-width: 768px) {
  .top-bar { display: none; }
  .main-nav { position: fixed; top: 72px; left: -100%; width: 80%; max-width: 300px; height: calc(100vh - 72px); background: #fff; box-shadow: 2px 0 10px rgba(0,0,0,0.1); transition: left 0.3s; padding: 20px; }
  .main-nav.open { left: 0; }
  .main-nav ul { flex-direction: column; align-items: stretch; gap: 0; }
  .main-nav a { padding: 14px 12px; border-bottom: 1px solid #f2f3f5; }
  .main-nav a.nav-btn { margin-left: 0; margin-top: 12px; text-align: center; }
  .menu-toggle { display: block; }
  .hero { padding: 40px 0; }
  .hero h1 { font-size: 28px; }
  .section { padding: 50px 0; }
  .section-header h2 { font-size: 24px; }
  .platform-grid { grid-template-columns: repeat(2, 1fr); gap: 15px; }
  .services-grid { grid-template-columns: 1fr; }
  .advantages-grid { grid-template-columns: 1fr; }
  .process-steps { grid-template-columns: 1fr; gap: 30px; }
  .form-row { grid-template-columns: 1fr; gap: 0; margin-bottom: 0; }
  .form-group { margin-bottom: 16px; }
  .apply-form-wrap { padding: 24px; }
  .article-header h1 { font-size: 24px; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-tags { gap: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}