/* ===== 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;
  background: #0F172A;
  color: #E2E8F0;
  line-height: 1.6;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; transition: color 0.3s; }
img { max-width: 100%; height: auto; }
ul { list-style: none; }

/* ===== Container ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== Navigation ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  padding: 0 24px;
  height: 72px;
  display: flex; align-items: center;
}
.navbar .container {
  display: flex; align-items: center; justify-content: space-between; width: 100%;
}
.nav-brand {
  display: flex; align-items: center; gap: 10px;
  font-size: 22px; font-weight: 700; color: #fff;
}
.nav-brand .logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, #2563EB, #7C3AED);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; font-weight: 900; color: #fff;
}
.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-links a {
  font-size: 15px; color: #94A3B8; font-weight: 500;
  transition: color 0.3s;
  position: relative;
}
.nav-links a:hover, .nav-links a.active { color: #fff; }
.nav-links a::after {
  content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px;
  background: #2563EB; transition: width 0.3s;
}
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-right { display: flex; align-items: center; gap: 16px; }
.btn-download {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 24px;
  background: linear-gradient(135deg, #2563EB, #7C3AED);
  color: #fff; font-size: 14px; font-weight: 600;
  border-radius: 8px;
  transition: transform 0.3s, box-shadow 0.3s;
}
.btn-download:hover {
  transform: scale(1.02);
  box-shadow: 0 8px 25px rgba(37, 99, 235, 0.4);
  color: #fff;
}

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  background: radial-gradient(ellipse at 50% 0%, rgba(37, 99, 235, 0.15) 0%, transparent 60%),
              radial-gradient(ellipse at 80% 50%, rgba(124, 58, 237, 0.1) 0%, transparent 50%);
  position: relative;
}
.hero-content { max-width: 800px; }
.hero h1 {
  font-size: 56px; font-weight: 800; line-height: 1.15;
  background: linear-gradient(135deg, #fff 0%, #94A3B8 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 20px;
}
.hero .subtitle {
  font-size: 20px; color: #94A3B8; margin-bottom: 16px; max-width: 600px; margin-left: auto; margin-right: auto;
}
.hero .stats {
  font-size: 16px; color: #64748B; margin-bottom: 40px;
}
.hero .stats span { color: #2563EB; font-weight: 700; }
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 16px 36px;
  background: linear-gradient(135deg, #2563EB, #7C3AED);
  color: #fff; font-size: 17px; font-weight: 600;
  border-radius: 12px;
  transition: transform 0.3s, box-shadow 0.3s;
}
.btn-primary:hover {
  transform: scale(1.02);
  box-shadow: 0 12px 35px rgba(37, 99, 235, 0.4);
  color: #fff;
}
.btn-secondary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 16px 36px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  color: #E2E8F0; font-size: 17px; font-weight: 600;
  border-radius: 12px;
  transition: background 0.3s, border-color 0.3s;
}
.btn-secondary:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.2);
  color: #fff;
}

/* ===== Section Common ===== */
.section { padding: 100px 24px; }
.section-header { text-align: center; margin-bottom: 64px; }
.section-header h2 {
  font-size: 36px; font-weight: 700; color: #fff; margin-bottom: 16px;
}
.section-header p { font-size: 18px; color: #94A3B8; max-width: 600px; margin: 0 auto; }

/* ===== Value Cards ===== */
.value-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
  max-width: 1200px; margin: 0 auto;
}
.value-card {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 16px;
  padding: 36px 28px;
  text-align: center;
  transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
}
.value-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0,0,0,0.3);
  border-color: rgba(37, 99, 235, 0.3);
}
.value-card .icon {
  width: 64px; height: 64px; margin: 0 auto 20px;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.15), rgba(124, 58, 237, 0.15));
  border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 28px;
}
.value-card h3 { font-size: 20px; font-weight: 600; color: #fff; margin-bottom: 12px; }
.value-card p { font-size: 15px; color: #94A3B8; line-height: 1.7; }

/* ===== Features ===== */
.feature-row {
  display: flex; align-items: center; gap: 64px;
  max-width: 1100px; margin: 0 auto 80px;
}
.feature-row:nth-child(even) { flex-direction: row-reverse; }
.feature-text { flex: 1; }
.feature-text h3 { font-size: 28px; font-weight: 700; color: #fff; margin-bottom: 16px; }
.feature-text p { font-size: 16px; color: #94A3B8; line-height: 1.8; }
.feature-visual {
  flex: 1;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.08), rgba(124, 58, 237, 0.08));
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 20px;
  padding: 48px;
  display: flex; align-items: center; justify-content: center;
  min-height: 280px;
  font-size: 64px;
}

/* ===== Nodes Map ===== */
.nodes-section { background: rgba(255,255,255,0.01); }
.nodes-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 16px;
  max-width: 900px; margin: 0 auto;
}
.node-item {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 12px;
  padding: 20px;
  text-align: center;
  transition: border-color 0.3s, transform 0.3s;
}
.node-item:hover {
  border-color: rgba(37, 99, 235, 0.4);
  transform: translateY(-4px);
}
.node-item .flag { font-size: 32px; margin-bottom: 8px; }
.node-item .name { font-size: 15px; color: #E2E8F0; font-weight: 500; }
.node-item .status { font-size: 12px; color: #22C55E; margin-top: 4px; }

/* ===== Download / Platform ===== */
.platform-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
  max-width: 900px; margin: 0 auto;
}
.platform-card {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 16px;
  padding: 36px 24px;
  text-align: center;
  transition: transform 0.3s, border-color 0.3s;
}
.platform-card:hover {
  transform: translateY(-6px);
  border-color: rgba(37, 99, 235, 0.3);
}
.platform-card .p-icon { font-size: 48px; margin-bottom: 16px; }
.platform-card h3 { font-size: 18px; color: #fff; margin-bottom: 8px; }
.platform-card .version { font-size: 13px; color: #64748B; margin-bottom: 16px; }
.platform-card .btn-dl {
  display: inline-block;
  padding: 10px 28px;
  background: linear-gradient(135deg, #2563EB, #7C3AED);
  color: #fff; font-size: 14px; font-weight: 600;
  border-radius: 8px;
  transition: box-shadow 0.3s;
}
.platform-card .btn-dl:hover {
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.35);
  color: #fff;
}

/* ===== Testimonials ===== */
.testimonial-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
  max-width: 1100px; margin: 0 auto;
}
.testimonial-card {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 16px;
  padding: 32px;
}
.testimonial-card .stars { color: #F59E0B; font-size: 18px; margin-bottom: 16px; }
.testimonial-card .quote { font-size: 15px; color: #CBD5E1; line-height: 1.8; margin-bottom: 20px; font-style: italic; }
.testimonial-card .author { font-size: 14px; color: #64748B; }
.rating-badge {
  text-align: center; margin-bottom: 48px;
}
.rating-badge .score { font-size: 48px; font-weight: 800; color: #F59E0B; }
.rating-badge .count { font-size: 16px; color: #94A3B8; }

/* ===== Pricing ===== */
.pricing-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px;
  max-width: 900px; margin: 0 auto;
}
.pricing-card {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 20px;
  padding: 40px 32px;
  position: relative;
  transition: transform 0.3s, border-color 0.3s;
}
.pricing-card:hover {
  transform: translateY(-6px);
  border-color: rgba(37, 99, 235, 0.3);
}
.pricing-card.featured {
  border-color: #2563EB;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.08), rgba(124, 58, 237, 0.05));
}
.pricing-card.featured::before {
  content: '最受欢迎';
  position: absolute; top: -12px; right: 24px;
  background: linear-gradient(135deg, #F59E0B, #EF4444);
  color: #fff; font-size: 12px; font-weight: 700;
  padding: 4px 16px; border-radius: 20px;
}
.pricing-card h3 { font-size: 22px; color: #fff; margin-bottom: 8px; }
.pricing-card .price-range { font-size: 14px; color: #94A3B8; margin-bottom: 24px; }
.pricing-table { width: 100%; margin-bottom: 28px; }
.pricing-table td {
  padding: 10px 0; font-size: 14px; border-bottom: 1px solid rgba(255,255,255,0.04);
}
.pricing-table td:first-child { color: #94A3B8; }
.pricing-table td:last-child { color: #E2E8F0; font-weight: 600; text-align: right; }
.pricing-card .btn-sub {
  display: block; text-align: center;
  padding: 14px; border-radius: 10px;
  font-size: 15px; font-weight: 600;
  transition: box-shadow 0.3s, transform 0.3s;
}
.pricing-card .btn-sub.primary {
  background: linear-gradient(135deg, #2563EB, #7C3AED); color: #fff;
}
.pricing-card .btn-sub.secondary {
  background: rgba(255,255,255,0.06); color: #E2E8F0;
  border: 1px solid rgba(255,255,255,0.1);
}
.pricing-card .btn-sub:hover {
  transform: scale(1.02);
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.3);
  color: #fff;
}

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 12px;
  padding: 28px 32px;
  margin-bottom: 16px;
}
.faq-item h3 {
  font-size: 18px; color: #fff; font-weight: 600; margin-bottom: 16px;
  display: flex; align-items: center; gap: 10px;
}
.faq-item h3 .q-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px;
  background: linear-gradient(135deg, #2563EB, #7C3AED);
  border-radius: 50%; font-size: 13px; font-weight: 700; color: #fff;
  flex-shrink: 0;
}
.faq-item .steps { padding-left: 38px; }
.faq-item .steps li {
  position: relative; padding: 6px 0; font-size: 15px; color: #CBD5E1; line-height: 1.7;
  list-style: decimal;
}

/* ===== About ===== */
.about-content { max-width: 800px; margin: 0 auto; }
.about-content p { font-size: 16px; color: #CBD5E1; line-height: 1.9; margin-bottom: 20px; }
.about-highlights {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
  margin-top: 48px;
}
.about-stat {
  text-align: center;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 16px;
  padding: 32px;
}
.about-stat .num { font-size: 40px; font-weight: 800; color: #2563EB; }
.about-stat .label { font-size: 14px; color: #94A3B8; margin-top: 8px; }

/* ===== Footer ===== */
.footer {
  background: rgba(0,0,0,0.3);
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 64px 24px 32px;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px;
  max-width: 1200px; margin: 0 auto 48px;
}
.footer-brand .brand-name { font-size: 20px; font-weight: 700; color: #fff; margin-bottom: 12px; }
.footer-brand p { font-size: 14px; color: #64748B; line-height: 1.7; }
.footer-col h4 { font-size: 14px; font-weight: 600; color: #fff; margin-bottom: 16px; text-transform: uppercase; letter-spacing: 0.5px; }
.footer-col a { display: block; font-size: 14px; color: #64748B; padding: 4px 0; transition: color 0.3s; }
.footer-col a:hover { color: #2563EB; }
.footer-bottom {
  max-width: 1200px; margin: 0 auto;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.06);
  display: flex; justify-content: space-between; align-items: center;
  font-size: 13px; color: #475569;
}
.footer-bottom a { color: #64748B; }
.footer-bottom a:hover { color: #2563EB; }

/* ===== Warning Banner ===== */
.warning-banner {
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.2);
  border-radius: 12px;
  padding: 16px 24px;
  text-align: center;
  font-size: 14px; color: #F59E0B;
  max-width: 800px; margin: 0 auto 48px;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .value-grid { grid-template-columns: repeat(2, 1fr); }
  .platform-grid { grid-template-columns: repeat(2, 1fr); }
  .testimonial-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hero h1 { font-size: 36px; }
  .hero .subtitle { font-size: 17px; }
  .section-header h2 { font-size: 28px; }
  .feature-row, .feature-row:nth-child(even) { flex-direction: column; gap: 32px; }
  .value-grid { grid-template-columns: 1fr; }
  .platform-grid { grid-template-columns: 1fr 1fr; }
  .about-highlights { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
}
@media (max-width: 480px) {
  .hero h1 { font-size: 28px; }
  .hero-buttons { flex-direction: column; align-items: center; }
  .platform-grid { grid-template-columns: 1fr; }
}