/* Reset & Base */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif; color: #333; line-height: 1.6; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* Top Bar */
.top-bar { background: #1a1a2e; color: #aaa; font-size: 13px; padding: 6px 0; }
.top-bar .container { display: flex; justify-content: space-between; align-items: center; }
.top-bar a { color: #ccc; margin-left: 15px; transition: color .3s; }
.top-bar a:hover { color: #4fc3f7; }

/* Header */
.header { background: #0f0f23; padding: 0; position: sticky; top: 0; z-index: 100; box-shadow: 0 2px 10px rgba(0,0,0,.3); }
.header .container { display: flex; justify-content: space-between; align-items: center; height: 70px; }
.logo { font-size: 22px; font-weight: 700; color: #fff; letter-spacing: 1px; }
.logo span { color: #4fc3f7; }
.nav { display: flex; gap: 5px; }
.nav a { color: #ddd; padding: 10px 18px; font-size: 15px; border-radius: 4px; transition: all .3s; position: relative; }
.nav a:hover, .nav a.active { color: #4fc3f7; background: rgba(79,195,247,.08); }
.nav-toggle { display: none; background: none; border: none; color: #fff; font-size: 26px; cursor: pointer; }

/* Hero */
.hero { background: linear-gradient(135deg, #0f0f23 0%, #1a1a3e 40%, #0d2137 100%); color: #fff; padding: 100px 0 80px; text-align: center; position: relative; overflow: hidden; }
.hero::before { content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%; background: radial-gradient(circle at 30% 50%, rgba(79,195,247,.06) 0%, transparent 50%), radial-gradient(circle at 70% 30%, rgba(100,100,255,.05) 0%, transparent 40%); }
.hero h1 { font-size: 44px; margin-bottom: 20px; position: relative; }
.hero p { font-size: 18px; color: #b0bec5; max-width: 700px; margin: 0 auto 35px; position: relative; }
.btn { display: inline-block; padding: 14px 36px; border-radius: 4px; font-size: 15px; font-weight: 600; transition: all .3s; cursor: pointer; }
.btn-primary { background: linear-gradient(135deg, #4fc3f7, #2196f3); color: #fff; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(33,150,243,.4); }
.btn-outline { border: 1px solid rgba(255,255,255,.3); color: #fff; margin-left: 12px; }
.btn-outline:hover { border-color: #4fc3f7; color: #4fc3f7; }

/* Sections */
.section { padding: 70px 0; }
.section-dark { background: #f5f7fa; }
.section-title { text-align: center; margin-bottom: 50px; }
.section-title h2 { font-size: 32px; color: #1a1a2e; margin-bottom: 10px; }
.section-title p { color: #777; font-size: 16px; }

/* Feature Cards */
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 30px; }
.feature-card { background: #fff; border-radius: 8px; padding: 35px 30px; box-shadow: 0 2px 15px rgba(0,0,0,.06); transition: all .3s; border-top: 3px solid transparent; }
.feature-card:hover { transform: translateY(-5px); box-shadow: 0 8px 30px rgba(0,0,0,.1); border-top-color: #4fc3f7; }
.feature-card .icon { font-size: 40px; margin-bottom: 18px; }
.feature-card h3 { font-size: 20px; margin-bottom: 12px; color: #1a1a2e; }
.feature-card p { color: #666; font-size: 14px; }

/* Stats */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; text-align: center; }
.stat-item h3 { font-size: 42px; color: #4fc3f7; font-weight: 700; }
.stat-item p { color: #777; margin-top: 5px; font-size: 14px; }

/* Products Grid */
.products-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 25px; }
.product-card { background: #fff; border-radius: 8px; overflow: hidden; box-shadow: 0 2px 15px rgba(0,0,0,.06); transition: all .3s; }
.product-card:hover { transform: translateY(-3px); box-shadow: 0 8px 25px rgba(0,0,0,.1); }
.product-card .card-icon { background: linear-gradient(135deg, #0f0f23, #1a1a3e); padding: 30px; text-align: center; font-size: 48px; }
.product-card .card-body { padding: 25px; }
.product-card h3 { font-size: 18px; margin-bottom: 10px; color: #1a1a2e; }
.product-card p { color: #666; font-size: 14px; margin-bottom: 15px; }
.product-card .learn-more { color: #2196f3; font-size: 14px; font-weight: 600; }
.product-card .learn-more:hover { color: #4fc3f7; }

/* Advantages */
.advantages-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 25px; }
.advantage-item { display: flex; gap: 18px; padding: 25px; background: #fff; border-radius: 8px; box-shadow: 0 2px 10px rgba(0,0,0,.04); }
.advantage-item .num { font-size: 28px; font-weight: 700; color: #4fc3f7; min-width: 40px; }
.advantage-item h4 { font-size: 17px; color: #1a1a2e; margin-bottom: 6px; }
.advantage-item p { color: #666; font-size: 14px; }

/* CTA */
.cta { background: linear-gradient(135deg, #0f0f23, #1a1a3e); color: #fff; padding: 70px 0; text-align: center; }
.cta h2 { font-size: 32px; margin-bottom: 15px; }
.cta p { color: #b0bec5; margin-bottom: 30px; font-size: 16px; }

/* Page Header (sub pages) */
.page-header { background: linear-gradient(135deg, #0f0f23, #1a1a3e); color: #fff; padding: 60px 0; text-align: center; }
.page-header h1 { font-size: 36px; margin-bottom: 10px; }
.page-header p { color: #b0bec5; }

/* Content Sections for sub pages */
.content-section { padding: 50px 0; }
.content-section h2 { font-size: 26px; color: #1a1a2e; margin-bottom: 15px; }
.content-section p { color: #555; margin-bottom: 15px; }
.content-section ul { padding-left: 20px; color: #555; margin-bottom: 15px; }
.content-section li { margin-bottom: 8px; }

/* Table */
.data-table { width: 100%; border-collapse: collapse; margin: 20px 0; }
.data-table th { background: #1a1a2e; color: #fff; padding: 12px 15px; text-align: left; font-size: 14px; }
.data-table td { padding: 12px 15px; border-bottom: 1px solid #eee; font-size: 14px; }
.data-table tr:hover td { background: #f8f9fa; }

/* Footer */
.footer { background: #0a0a1a; color: #aaa; padding: 50px 0 20px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer h4 { color: #fff; font-size: 16px; margin-bottom: 15px; }
.footer p, .footer a { font-size: 14px; color: #888; }
.footer a { display: block; margin-bottom: 8px; transition: color .3s; }
.footer a:hover { color: #4fc3f7; }
.footer-bottom { border-top: 1px solid #1a1a2e; padding-top: 20px; text-align: center; font-size: 13px; color: #555; }
.footer .brand-desc { color: #777; font-size: 13px; line-height: 1.8; }

/* Responsive */
@media (max-width: 768px) {
  .nav { display: none; position: absolute; top: 70px; left: 0; right: 0; background: #0f0f23; flex-direction: column; padding: 15px; }
  .nav.open { display: flex; }
  .nav-toggle { display: block; }
  .hero h1 { font-size: 28px; }
  .hero { padding: 60px 0 50px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .advantages-list { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .top-bar { display: none; }
}