/* 全局样式与重置 */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: 'Segoe UI', 'PingFang SC', Roboto, 'Helvetica Neue', sans-serif; background: #f8fafc; color: #1e293b; line-height: 1.6; transition: background 0.3s, color 0.3s; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
img, svg { display: block; max-width: 100%; height: auto; }
.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
/* 渐变背景与品牌色 */
.bg-gradient { background: linear-gradient(135deg, #1a73e8 0%, #0d47a1 100%); }
.text-primary { color: #1a73e8; }
.border-primary { border-color: #1a73e8; }
.btn-primary { background: #1a73e8; color: #fff; padding: 12px 28px; border-radius: 30px; border: none; font-weight: 600; cursor: pointer; transition: all 0.3s; display: inline-block; }
.btn-primary:hover { background: #0d47a1; transform: translateY(-2px); box-shadow: 0 8px 20px rgba(26,115,232,0.3); }
/* 毛玻璃卡片 */
.glass-card { background: rgba(255,255,255,0.7); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); border: 1px solid rgba(255,255,255,0.3); border-radius: 24px; box-shadow: 0 8px 32px rgba(0,0,0,0.06); transition: all 0.4s; }
.glass-card:hover { transform: translateY(-6px); box-shadow: 0 16px 48px rgba(0,0,0,0.1); }
/* 圆角与阴影 */
.rounded-2xl { border-radius: 20px; }
.shadow-soft { box-shadow: 0 4px 20px rgba(0,0,0,0.05); }
/* 滚动动画 */
.fade-in { opacity: 0; transform: translateY(30px); transition: opacity 0.7s ease, transform 0.7s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }
/* 暗黑模式 */
.dark-mode { background: #0f172a; color: #e2e8f0; }
.dark-mode .glass-card { background: rgba(30,41,59,0.7); border-color: rgba(255,255,255,0.08); }
.dark-mode .btn-primary { background: #3b82f6; }
.dark-mode .btn-primary:hover { background: #2563eb; }
.dark-mode .bg-gradient { background: linear-gradient(135deg, #1e3a5f 0%, #0a1628 100%); }
/* 导航 */
.navbar { position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; background: rgba(255,255,255,0.85); backdrop-filter: blur(20px); border-bottom: 1px solid rgba(0,0,0,0.05); transition: background 0.3s; }
.dark-mode .navbar { background: rgba(15,23,42,0.85); border-bottom-color: rgba(255,255,255,0.05); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.nav-logo { font-size: 1.6rem; font-weight: 800; background: linear-gradient(135deg, #1a73e8, #0d47a1); -webkit-background-clip: text; -webkit-text-fill-color: transparent; letter-spacing: -0.5px; }
.nav-links { display: flex; gap: 32px; font-weight: 500; }
.nav-links a { position: relative; padding: 4px 0; transition: color 0.2s; }
.nav-links a::after { content: ''; position: absolute; bottom: -2px; left: 0; width: 0; height: 2px; background: #1a73e8; transition: width 0.3s; }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-actions { display: flex; gap: 12px; align-items: center; }
.dark-toggle { background: none; border: none; font-size: 1.4rem; cursor: pointer; padding: 6px; border-radius: 50%; transition: background 0.2s; }
.dark-toggle:hover { background: rgba(0,0,0,0.05); }
.mobile-menu-btn { display: none; background: none; border: none; font-size: 1.8rem; cursor: pointer; padding: 4px; }
@media (max-width: 768px) { .nav-links { display: none; flex-direction: column; position: absolute; top: 72px; left: 0; width: 100%; background: rgba(255,255,255,0.95); backdrop-filter: blur(20px); padding: 20px 24px; gap: 16px; } .nav-links.open { display: flex; } .mobile-menu-btn { display: block; } .dark-mode .nav-links { background: rgba(15,23,42,0.95); } }
/* Hero Banner */
.hero { padding-top: 80px; min-height: 100vh; display: flex; align-items: center; background: linear-gradient(135deg, #e8f0fe 0%, #f1f5f9 100%); position: relative; overflow: hidden; }
.dark-mode .hero { background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%); }
.hero-slider { position: relative; width: 100%; }
.hero-slide { display: none; align-items: center; justify-content: space-between; gap: 40px; padding: 60px 0; }
.hero-slide.active { display: flex; }
.hero-text { flex: 1; }
.hero-text h1 { font-size: 3.2rem; font-weight: 800; line-height: 1.2; margin-bottom: 20px; }
.hero-text p { font-size: 1.2rem; color: #475569; margin-bottom: 32px; max-width: 560px; }
.dark-mode .hero-text p { color: #94a3b8; }
.hero-visual { flex: 1; display: flex; justify-content: center; }
.hero-visual svg { width: 100%; max-width: 480px; height: auto; }
.hero-dots { display: flex; justify-content: center; gap: 12px; margin-top: 24px; }
.hero-dots button { width: 12px; height: 12px; border-radius: 50%; border: none; background: #cbd5e1; cursor: pointer; transition: all 0.3s; }
.hero-dots button.active { background: #1a73e8; width: 32px; border-radius: 6px; }
@media (max-width: 768px) { .hero-slide { flex-direction: column; text-align: center; } .hero-text h1 { font-size: 2rem; } .hero-text p { font-size: 1rem; } }
/* 通用模块标题 */
.section-title { text-align: center; margin-bottom: 48px; }
.section-title h2 { font-size: 2.2rem; font-weight: 700; margin-bottom: 12px; }
.section-title p { color: #64748b; max-width: 640px; margin: 0 auto; font-size: 1.05rem; }
.dark-mode .section-title p { color: #94a3b8; }
/* 网格 */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.grid-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 28px; }
.grid-4 { display: grid; grid-template-columns: repeat(4,1fr); gap: 24px; }
.grid-5 { display: grid; grid-template-columns: repeat(5,1fr); gap: 20px; }
@media (max-width: 1024px) { .grid-4 { grid-template-columns: repeat(2,1fr); } .grid-5 { grid-template-columns: repeat(3,1fr); } }
@media (max-width: 768px) { .grid-2, .grid-3, .grid-4, .grid-5 { grid-template-columns: 1fr; } }
/* 模块间距 */
.section { padding: 80px 0; }
/* 面包屑 */
.breadcrumb { padding: 16px 0; font-size: 0.9rem; color: #64748b; display: flex; flex-wrap: wrap; gap: 8px; }
.breadcrumb a { color: #1a73e8; }
/* Footer */
.footer { background: #0f172a; color: #cbd5e1; padding: 60px 0 30px; }
.footer a { color: #94a3b8; transition: color 0.2s; }
.footer a:hover { color: #fff; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
@media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.footer-bottom { border-top: 1px solid #1e293b; padding-top: 24px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; font-size: 0.85rem; }
/* 数据展示 */
.stat-item { text-align: center; padding: 24px; }
.stat-number { font-size: 2.8rem; font-weight: 800; color: #1a73e8; }
.dark-mode .stat-number { color: #60a5fa; }
.stat-label { color: #64748b; margin-top: 8px; }
/* FAQ */
.faq-item { border-bottom: 1px solid #e2e8f0; padding: 16px 0; cursor: pointer; }
.dark-mode .faq-item { border-color: #334155; }
.faq-question { display: flex; justify-content: space-between; font-weight: 600; font-size: 1.05rem; }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding 0.3s; padding-top: 0; color: #475569; }
.dark-mode .faq-answer { color: #94a3b8; }
.faq-item.open .faq-answer { max-height: 300px; padding-top: 12px; }
/* 返回顶部 */
#backToTop { position: fixed; bottom: 40px; right: 40px; width: 48px; height: 48px; border-radius: 50%; background: #1a73e8; color: #fff; border: none; font-size: 1.4rem; cursor: pointer; box-shadow: 0 4px 16px rgba(26,115,232,0.3); opacity: 0; visibility: hidden; transition: all 0.3s; z-index: 999; }
#backToTop.show { opacity: 1; visibility: visible; }
#backToTop:hover { transform: scale(1.1); }
/* 搜索模拟 */
.search-box { display: flex; gap: 8px; max-width: 400px; margin: 20px auto 0; }
.search-box input { flex: 1; padding: 12px 20px; border-radius: 30px; border: 1px solid #e2e8f0; background: rgba(255,255,255,0.8); outline: none; font-size: 1rem; }
.dark-mode .search-box input { background: rgba(30,41,59,0.8); border-color: #334155; color: #e2e8f0; }
.search-box button { padding: 12px 24px; border-radius: 30px; border: none; background: #1a73e8; color: #fff; font-weight: 600; cursor: pointer; }
/* 其他 */
.client-logo { display: flex; align-items: center; justify-content: center; padding: 16px; opacity: 0.7; transition: opacity 0.3s; }
.client-logo:hover { opacity: 1; }
.news-card { padding: 24px; }
.news-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
.news-card .date { color: #94a3b8; font-size: 0.85rem; }
.team-member { text-align: center; padding: 24px; }
.team-member h4 { margin-top: 12px; font-weight: 600; }
.team-member p { color: #64748b; font-size: 0.9rem; }
.contact-info p { margin-bottom: 8px; }
.contact-info strong { display: inline-block; min-width: 80px; }