* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  color: #1f2937;
  line-height: 1.7;
  background: #f8fafc;
}
a { color: inherit; text-decoration: none; }

/* Top Bar */
.top-bar {
  background: #0f172a;
  color: #cbd5e1;
  font-size: 13px;
  padding: 8px 0;
}
.top-bar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}
.top-bar span { margin-right: 16px; }

/* Header / Nav */
.header {
  background: #fff;
  border-bottom: 1px solid #e2e8f0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}
.nav-logo {
  font-size: 22px;
  font-weight: 700;
  color: #0f172a;
  display: flex;
  align-items: center;
  gap: 10px;
}
.nav-logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, #dc2626, #f59e0b);
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
  font-weight: bold;
}
.nav-menu {
  display: flex;
  gap: 4px;
  list-style: none;
  flex-wrap: wrap;
}
.nav-menu a {
  padding: 8px 14px;
  border-radius: 6px;
  color: #475569;
  font-size: 15px;
  transition: all 0.2s;
}
.nav-menu a:hover, .nav-menu a.active {
  background: #f1f5f9;
  color: #0f172a;
}

/* Hero */
.hero {
  background: linear-gradient(135deg, #1e3a8a 0%, #312e81 50%, #4c1d95 100%);
  color: #fff;
  padding: 80px 24px 100px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(245, 158, 11, 0.15) 0%, transparent 70%);
  border-radius: 50%;
}
.hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}
.hero-tag {
  display: inline-block;
  padding: 6px 14px;
  background: rgba(251, 191, 36, 0.2);
  border: 1px solid rgba(251, 191, 36, 0.4);
  border-radius: 20px;
  font-size: 13px;
  color: #fde68a;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  max-width: 760px;
}
.hero-sub {
  font-size: 18px;
  opacity: 0.88;
  max-width: 680px;
  margin-bottom: 32px;
}
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 500;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}
.btn-primary {
  background: #f59e0b;
  color: #0f172a;
}
.btn-primary:hover { background: #fbbf24; transform: translateY(-1px); }
.btn-outline {
  border: 1px solid rgba(255,255,255,0.3);
  color: #fff;
}
.btn-outline:hover { background: rgba(255,255,255,0.1); }

/* Sections */
.section { padding: 72px 24px; }
.section-inner { max-width: 1200px; margin: 0 auto; }
.section-title {
  text-align: center;
  margin-bottom: 12px;
  font-size: 32px;
  font-weight: 700;
  color: #0f172a;
}
.section-sub {
  text-align: center;
  color: #64748b;
  margin-bottom: 48px;
  font-size: 16px;
}
.section-bg-light { background: #fff; }
.section-bg-gray { background: #f1f5f9; }

/* Feature grid */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 28px;
}
.feature-card {
  background: #fff;
  padding: 32px 26px;
  border-radius: 12px;
  border: 1px solid #e2e8f0;
  transition: all 0.3s;
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
  border-color: #cbd5e1;
}
.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 16px;
}
.icon-red { background: #fef2f2; color: #dc2626; }
.icon-blue { background: #eff6ff; color: #2563eb; }
.icon-green { background: #f0fdf4; color: #16a34a; }
.icon-amber { background: #fffbeb; color: #d97706; }
.feature-card h3 {
  font-size: 19px;
  margin-bottom: 10px;
  color: #0f172a;
}
.feature-card p {
  color: #64748b;
  font-size: 15px;
  line-height: 1.7;
}

/* Product card */
.product-card {
  background: #fff;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid #e2e8f0;
  transition: all 0.3s;
}
.product-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.1);
}
.product-visual {
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 72px;
  color: #fff;
  position: relative;
  overflow: hidden;
}
.product-visual.red { background: linear-gradient(135deg, #dc2626, #f59e0b); }
.product-visual.blue { background: linear-gradient(135deg, #0ea5e9, #2563eb); }
.product-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 70% 30%, rgba(255,255,255,0.2), transparent 50%);
}
.product-body { padding: 28px 24px; }
.product-body h3 {
  font-size: 22px;
  margin-bottom: 6px;
  color: #0f172a;
}
.product-tag {
  display: inline-block;
  padding: 2px 10px;
  font-size: 12px;
  background: #f1f5f9;
  color: #475569;
  border-radius: 4px;
  margin-bottom: 12px;
}
.product-body p {
  color: #64748b;
  font-size: 15px;
  margin-bottom: 16px;
}
.product-body a {
  color: #2563eb;
  font-weight: 500;
  font-size: 14px;
}

/* Intro split */
.intro-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}
@media (max-width: 768px) {
  .intro-split { grid-template-columns: 1fr; }
}
.intro-split h2 {
  font-size: 30px;
  margin-bottom: 18px;
  color: #0f172a;
}
.intro-split p {
  color: #475569;
  margin-bottom: 14px;
}
.intro-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 24px;
}
.stat-box {
  background: #fff;
  padding: 20px;
  border-radius: 10px;
  border: 1px solid #e2e8f0;
  text-align: center;
}
.stat-num {
  font-size: 28px;
  font-weight: 700;
  color: #2563eb;
  display: block;
}
.stat-label {
  font-size: 13px;
  color: #64748b;
}
.intro-visual {
  background: linear-gradient(135deg, #fef3c7, #fed7aa);
  border-radius: 16px;
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 120px;
  color: #b45309;
}

/* News list */
.news-list { display: grid; gap: 16px; }
.news-item {
  background: #fff;
  padding: 20px 24px;
  border-radius: 10px;
  border: 1px solid #e2e8f0;
  display: flex;
  align-items: center;
  gap: 20px;
  transition: all 0.2s;
}
.news-item:hover {
  border-color: #cbd5e1;
  transform: translateX(4px);
}
.news-date {
  flex-shrink: 0;
  text-align: center;
  padding: 8px 14px;
  background: #f1f5f9;
  border-radius: 8px;
  font-size: 13px;
  color: #475569;
}
.news-title {
  font-size: 16px;
  color: #0f172a;
  font-weight: 500;
}
.news-desc {
  color: #64748b;
  font-size: 14px;
  margin-top: 4px;
}

/* Content page (agreement, privacy) */
.content-page {
  max-width: 900px;
  margin: 0 auto;
  padding: 50px 24px 80px;
}
.content-page h1 {
  font-size: 32px;
  color: #0f172a;
  margin-bottom: 10px;
}
.content-page .update {
  color: #64748b;
  font-size: 14px;
  margin-bottom: 30px;
  padding-bottom: 20px;
  border-bottom: 1px solid #e2e8f0;
}
.content-page h2 {
  font-size: 20px;
  margin-top: 32px;
  margin-bottom: 12px;
  color: #0f172a;
  padding-left: 12px;
  border-left: 3px solid #2563eb;
}
.content-page p {
  margin-bottom: 12px;
  color: #334155;
}
.content-page ul, .content-page ol {
  padding-left: 22px;
  margin-bottom: 14px;
  color: #334155;
}
.content-page li { margin-bottom: 6px; }

/* Breadcrumb */
.breadcrumb {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 24px 0;
  font-size: 14px;
  color: #64748b;
}
.breadcrumb a:hover { color: #2563eb; }

/* Footer */
.footer {
  background: #0f172a;
  color: #cbd5e1;
  padding: 60px 24px 30px;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
}
.footer-cols {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
@media (max-width: 768px) {
  .footer-cols { grid-template-columns: 1fr 1fr; }
}
.footer-brand { font-size: 18px; font-weight: 700; color: #fff; margin-bottom: 14px; }
.footer-col p { font-size: 14px; color: #94a3b8; line-height: 1.8; }
.footer-col h4 {
  color: #fff;
  font-size: 15px;
  margin-bottom: 16px;
}
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul a {
  color: #94a3b8;
  font-size: 14px;
  transition: color 0.2s;
}
.footer-col ul a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: 24px;
  text-align: center;
  font-size: 13px;
  color: #64748b;
  line-height: 1.9;
}
.footer-bottom a { color: #94a3b8; }
.footer-bottom a:hover { color: #fff; }

@media (max-width: 768px) {
  .hero { padding: 60px 20px 70px; }
  .hero h1 { font-size: 32px; }
  .hero-sub { font-size: 16px; }
  .section { padding: 50px 20px; }
  .section-title { font-size: 26px; }
  .nav { padding: 12px 20px; }
  .nav-menu { width: 100%; justify-content: flex-start; overflow-x: auto; }
}