/* === Reset & Base === */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif; color: #1E293B; background: #FFFFFF; line-height: 1.6; }
a { text-decoration: none; color: inherit; transition: color .2s; }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }

/* === Utility === */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.section-alt { background: #F8FAFC; }
.text-center { text-align: center; }
.text-muted { color: #64748B; }
.section-title { font-size: 36px; font-weight: 700; text-align: center; margin-bottom: 16px; }
.section-desc { font-size: 18px; color: #64748B; text-align: center; max-width: 700px; margin: 0 auto 48px; }

/* === Header === */
.header { position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; background: rgba(255,255,255,0.95); backdrop-filter: blur(12px); border-bottom: 1px solid rgba(0,0,0,0.06); transition: background .3s; }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.logo { display: flex; align-items: center; gap: 10px; font-size: 22px; font-weight: 700; color: #2563EB; }
.logo-icon { width: 36px; height: 36px; background: #2563EB; border-radius: 10px; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 18px; font-weight: 800; }
.nav { display: flex; align-items: center; gap: 32px; }
.nav a { font-size: 15px; color: #475569; font-weight: 500; transition: color .2s; }
.nav a:hover { color: #2563EB; }
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 12px 28px; border-radius: 12px; font-size: 16px; font-weight: 600; transition: all .2s; cursor: pointer; border: none; }
.btn-primary { background: #2563EB; color: #fff; }
.btn-primary:hover { background: #1D4ED8; transform: translateY(-1px); box-shadow: 0 4px 16px rgba(37,99,235,0.3); }
.btn-outline { background: transparent; color: #2563EB; border: 2px solid #2563EB; }
.btn-outline:hover { background: #EFF6FF; }
.btn-sm { padding: 10px 22px; font-size: 14px; }
.btn-lg { padding: 16px 36px; font-size: 18px; }
.mobile-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px; }
.mobile-toggle span { width: 24px; height: 2px; background: #1E293B; border-radius: 2px; }

/* === Hero === */
.hero { padding: 140px 0 80px; background: linear-gradient(135deg, #EFF6FF 0%, #DBEAFE 50%, #F0F9FF 100%); position: relative; overflow: hidden; }
.hero-inner { display: flex; align-items: center; gap: 60px; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.hero-content { flex: 0 0 55%; }
.hero-visual { flex: 0 0 40%; display: flex; justify-content: center; align-items: center; }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; background: rgba(37,99,235,0.1); color: #2563EB; padding: 8px 16px; border-radius: 24px; font-size: 14px; font-weight: 600; margin-bottom: 24px; }
.hero h1 { font-size: 52px; font-weight: 800; line-height: 1.15; margin-bottom: 20px; color: #0F172A; }
.hero h1 span { color: #2563EB; }
.hero-subtitle { font-size: 18px; color: #475569; margin-bottom: 12px; line-height: 1.7; }
.hero-desc { font-size: 15px; color: #64748B; margin-bottom: 32px; }
.hero-ctas { display: flex; gap: 16px; margin-bottom: 32px; flex-wrap: wrap; }
.hero-trust { display: flex; align-items: center; gap: 24px; flex-wrap: wrap; }
.trust-item { display: flex; align-items: center; gap: 6px; font-size: 13px; color: #64748B; }
.trust-icon { color: #10B981; font-size: 16px; }
.hero-globe { width: 340px; height: 340px; background: radial-gradient(circle at 40% 40%, #60A5FA 0%, #2563EB 50%, #1E40AF 100%); border-radius: 50%; position: relative; box-shadow: 0 0 80px rgba(37,99,235,0.25), inset 0 0 40px rgba(255,255,255,0.1); }
.hero-globe::before { content: ""; position: absolute; top: 10%; left: 10%; width: 80%; height: 80%; border-radius: 50%; border: 1px dashed rgba(255,255,255,0.3); }
.hero-globe::after { content: ""; position: absolute; top: 25%; left: 25%; width: 50%; height: 50%; border-radius: 50%; border: 1px dashed rgba(255,255,255,0.2); }
.globe-dot { position: absolute; width: 8px; height: 8px; background: #10B981; border-radius: 50%; box-shadow: 0 0 12px rgba(16,185,129,0.6); }
.globe-dot:nth-child(1) { top: 20%; left: 60%; }
.globe-dot:nth-child(2) { top: 45%; left: 80%; }
.globe-dot:nth-child(3) { top: 70%; left: 35%; }
.globe-dot:nth-child(4) { top: 35%; left: 25%; }
.globe-dot:nth-child(5) { top: 60%; left: 65%; }

/* === Features Grid === */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card { background: #fff; border-radius: 16px; padding: 32px; border: 1px solid #E2E8F0; transition: all .3s; }
.feature-card:hover { transform: translateY(-4px); box-shadow: 0 12px 32px rgba(0,0,0,0.08); border-color: #BFDBFE; }
.feature-icon { width: 56px; height: 56px; background: #EFF6FF; border-radius: 14px; display: flex; align-items: center; justify-content: center; font-size: 28px; margin-bottom: 20px; }
.feature-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; }
.feature-card p { font-size: 15px; color: #64748B; line-height: 1.7; }

/* === Trust / Security === */
.trust-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.trust-card { text-align: center; padding: 40px 24px; background: #fff; border-radius: 16px; border: 1px solid #E2E8F0; }
.trust-badge { width: 80px; height: 80px; background: linear-gradient(135deg, #F59E0B, #D97706); border-radius: 50%; margin: 0 auto 20px; display: flex; align-items: center; justify-content: center; font-size: 36px; color: #fff; }
.trust-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; }
.trust-card p { font-size: 15px; color: #64748B; line-height: 1.6; }
.trust-card a { color: #2563EB; font-weight: 600; font-size: 14px; display: inline-block; margin-top: 12px; }
.trust-card a:hover { text-decoration: underline; }

/* === Pricing === */
.pricing-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; max-width: 900px; margin: 0 auto; }
.pricing-card { background: #fff; border-radius: 20px; padding: 40px; border: 2px solid #E2E8F0; position: relative; transition: all .3s; }
.pricing-card.featured { border-color: #2563EB; box-shadow: 0 8px 32px rgba(37,99,235,0.12); }
.pricing-tag { position: absolute; top: -14px; left: 50%; transform: translateX(-50%); background: #2563EB; color: #fff; padding: 6px 20px; border-radius: 20px; font-size: 13px; font-weight: 600; white-space: nowrap; }
.pricing-card h3 { font-size: 24px; font-weight: 700; margin-bottom: 8px; }
.pricing-card .price-desc { font-size: 14px; color: #64748B; margin-bottom: 24px; }
.pricing-table { width: 100%; border-collapse: collapse; margin-bottom: 24px; }
.pricing-table th, .pricing-table td { padding: 12px 16px; text-align: left; font-size: 15px; }
.pricing-table th { background: #F8FAFC; color: #64748B; font-weight: 600; font-size: 13px; text-transform: uppercase; }
.pricing-table td { border-bottom: 1px solid #F1F5F9; }
.pricing-table .price { font-weight: 700; color: #2563EB; }
.pricing-table tr.best td { background: #EFF6FF; }
.pricing-features { margin-bottom: 24px; }
.pricing-features li { padding: 8px 0; font-size: 14px; color: #475569; display: flex; align-items: center; gap: 8px; }
.pricing-features li::before { content: "\2713"; color: #10B981; font-weight: 700; }

/* === Testimonials === */
.testimonials-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.testimonial-card { background: #fff; border-radius: 16px; padding: 28px; border: 1px solid #E2E8F0; }
.testimonial-stars { color: #F59E0B; font-size: 16px; margin-bottom: 12px; letter-spacing: 2px; }
.testimonial-text { font-size: 15px; color: #334155; line-height: 1.7; margin-bottom: 16px; font-style: italic; }
.testimonial-meta { font-size: 13px; color: #94A3B8; }

/* === FAQ === */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { border: 1px solid #E2E8F0; border-radius: 12px; margin-bottom: 12px; overflow: hidden; background: #fff; }
.faq-item details { padding: 0; }
.faq-item summary { padding: 20px 24px; font-size: 17px; font-weight: 600; cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; transition: background .2s; }
.faq-item summary:hover { background: #F8FAFC; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-size: 22px; color: #94A3B8; font-weight: 300; transition: transform .2s; }
.faq-item details[open] summary::after { content: "-"; }
.faq-answer { padding: 0 24px 20px; font-size: 15px; color: #64748B; line-height: 1.8; }
.faq-answer ol { padding-left: 20px; list-style: decimal; }
.faq-answer ol li { padding: 4px 0; }

/* === Footer === */
.footer { background: #0F172A; color: #CBD5E1; padding: 60px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .logo { color: #fff; margin-bottom: 12px; }
.footer-brand p { font-size: 14px; line-height: 1.7; color: #94A3B8; }
.footer h4 { font-size: 15px; font-weight: 600; color: #F1F5F9; margin-bottom: 16px; }
.footer ul li { margin-bottom: 10px; }
.footer ul li a { font-size: 14px; color: #94A3B8; transition: color .2s; }
.footer ul li a:hover { color: #60A5FA; }
.footer-notice { background: rgba(37,99,235,0.1); border: 1px solid rgba(37,99,235,0.2); border-radius: 12px; padding: 16px 20px; margin-bottom: 32px; font-size: 14px; color: #93C5FD; }
.footer-bottom { border-top: 1px solid #1E293B; padding: 20px 0; display: flex; justify-content: space-between; align-items: center; font-size: 13px; color: #64748B; flex-wrap: wrap; gap: 12px; }
.footer-badges { display: flex; gap: 16px; align-items: center; }
.footer-badges span { background: rgba(255,255,255,0.08); padding: 6px 14px; border-radius: 8px; font-size: 12px; color: #94A3B8; }

/* === Page Hero (sub pages) === */
.page-hero { padding: 120px 0 60px; background: linear-gradient(135deg, #EFF6FF 0%, #DBEAFE 100%); text-align: center; }
.page-hero h1 { font-size: 42px; font-weight: 800; margin-bottom: 16px; color: #0F172A; }
.page-hero p { font-size: 18px; color: #475569; max-width: 600px; margin: 0 auto; }

/* === Feature Detail === */
.feature-detail { display: flex; align-items: center; gap: 60px; margin-bottom: 64px; }
.feature-detail:nth-child(even) { flex-direction: row-reverse; }
.feature-detail-content { flex: 1; }
.feature-detail-visual { flex: 1; display: flex; justify-content: center; }
.feature-detail-content h3 { font-size: 28px; font-weight: 700; margin-bottom: 16px; }
.feature-detail-content p { font-size: 16px; color: #64748B; line-height: 1.8; margin-bottom: 12px; }
.feature-visual-box { width: 280px; height: 200px; background: linear-gradient(135deg, #DBEAFE, #BFDBFE); border-radius: 20px; display: flex; align-items: center; justify-content: center; font-size: 64px; }

/* === About === */
.about-content { max-width: 800px; margin: 0 auto; }
.about-content p { font-size: 16px; color: #475569; line-height: 1.9; margin-bottom: 20px; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin: 48px 0; }
.stat-card { text-align: center; padding: 32px 16px; background: #fff; border-radius: 16px; border: 1px solid #E2E8F0; }
.stat-number { font-size: 42px; font-weight: 800; color: #2563EB; margin-bottom: 8px; }
.stat-label { font-size: 14px; color: #64748B; }

/* === CTA Section === */
.cta-section { background: linear-gradient(135deg, #2563EB, #1E40AF); padding: 80px 0; text-align: center; color: #fff; }
.cta-section h2 { font-size: 36px; font-weight: 700; margin-bottom: 16px; }
.cta-section p { font-size: 18px; opacity: 0.9; margin-bottom: 32px; }
.btn-white { background: #fff; color: #2563EB; }
.btn-white:hover { background: #F0F9FF; transform: translateY(-1px); box-shadow: 0 4px 16px rgba(0,0,0,0.15); }

/* === Official Notice === */
.official-notice { background: #FEF3C7; border: 1px solid #FDE68A; border-radius: 12px; padding: 20px 24px; margin: 32px auto; max-width: 800px; display: flex; align-items: center; gap: 12px; }
.official-notice-icon { font-size: 24px; flex-shrink: 0; }
.official-notice p { font-size: 14px; color: #92400E; line-height: 1.6; }
.official-notice strong { color: #78350F; }

/* === Mobile Nav === */
.mobile-nav { display: none; position: fixed; top: 72px; left: 0; width: 100%; background: #fff; border-bottom: 1px solid #E2E8F0; padding: 16px 20px; z-index: 999; box-shadow: 0 8px 24px rgba(0,0,0,0.08); }
.mobile-nav a { display: block; padding: 12px 0; font-size: 16px; color: #475569; border-bottom: 1px solid #F1F5F9; }
.mobile-nav a:last-child { border-bottom: none; }

/* === Responsive === */
@media (max-width: 1199px) {
  .features-grid, .testimonials-grid, .trust-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .hero h1 { font-size: 40px; }
}
@media (max-width: 767px) {
  .nav { display: none; }
  .mobile-toggle { display: flex; }
  .mobile-nav.active { display: block; }
  .hero-inner { flex-direction: column; text-align: center; }
  .hero-content, .hero-visual { flex: none; width: 100%; }
  .hero h1 { font-size: 32px; }
  .hero-ctas { justify-content: center; }
  .hero-trust { justify-content: center; }
  .hero-globe { width: 220px; height: 220px; }
  .features-grid, .testimonials-grid, .trust-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .feature-detail, .feature-detail:nth-child(even) { flex-direction: column; }
  .footer-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .section { padding: 48px 0; }
  .section-title { font-size: 28px; }
  .page-hero h1 { font-size: 30px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}