:root {
  --primary: #2980FE;
  --primary-dark: #1767d8;
  --bg: #ffffff;
  --soft: #f5f8fc;
  --soft-blue: #eef6ff;
  --line: #e3e9f2;
  --text: #202736;
  --muted: #667085;
  --deep: #111827;
  --card: #ffffff;
  --shadow: 0 18px 48px rgba(41, 128, 254, .10);
  --radius: 22px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
.container { width: min(100% - 32px, 1180px); margin: 0 auto; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.header-inner { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.logo, .footer-logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; color: var(--deep); letter-spacing: .02em; }
.logo img, .footer-logo img { width: 34px; height: 34px; border-radius: 10px; object-fit: contain; }
.nav-toggle {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 999px;
  padding: 8px 14px;
  color: var(--text);
  font-weight: 700;
}
.site-nav {
  display: none;
  position: absolute;
  left: 16px;
  right: 16px;
  top: 72px;
  padding: 12px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
}
.site-nav.open { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.site-nav a { padding: 10px 12px; border-radius: 12px; color: var(--muted); font-size: 14px; }
.site-nav a.active, .site-nav a:hover { background: var(--soft-blue); color: var(--primary); }
.product-hero {
  position: relative;
  padding: 42px 0 34px;
  background:
    radial-gradient(circle at 75% 12%, rgba(41,128,254,.16), transparent 28%),
    linear-gradient(180deg, #fff 0%, #f6faff 100%);
  overflow: hidden;
}
.product-hero:before {
  content: "";
  position: absolute;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  right: -160px;
  top: 90px;
  background: rgba(41,128,254,.08);
}
.hero-grid { position: relative; display: grid; gap: 28px; align-items: center; }
.eyebrow, .badge, .category-badge {
  display: inline-flex;
  width: fit-content;
  align-items: center;
  gap: 8px;
  color: var(--primary);
  background: var(--soft-blue);
  border: 1px solid rgba(41,128,254,.16);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 700;
}
h1, h2, h3 { color: var(--deep); line-height: 1.22; margin: 0 0 12px; }
h1 { font-size: clamp(32px, 8vw, 60px); letter-spacing: -0.04em; }
h2 { font-size: clamp(26px, 5vw, 40px); letter-spacing: -0.03em; }
h3 { font-size: 19px; }
p { margin: 0 0 14px; color: var(--muted); }
.hero-lead { font-size: 17px; color: #475467; max-width: 650px; }
.download-btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 48px;
  padding: 0 26px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-weight: 800;
  box-shadow: 0 12px 28px rgba(41,128,254,.24);
  transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.download-btn:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 16px 34px rgba(41,128,254,.30); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin-top: 22px; }
.security-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.security-tags span { padding: 8px 12px; border-radius: 999px; background: #fff; border: 1px solid var(--line); color: #344054; font-size: 13px; }
.app-visual { position: relative; padding: 18px; border-radius: 30px; background: linear-gradient(145deg, #fff, #eef6ff); border: 1px solid var(--line); box-shadow: var(--shadow); }
.app-visual .phone-shell { display: grid; place-items: center; border-radius: 28px; min-height: 260px; background: rgba(255,255,255,.68); }
.app-visual img { max-height: 500px; margin: 0 auto; object-fit: contain; }
.float-card { position: relative; margin-top: 10px; background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 12px 14px; box-shadow: 0 12px 28px rgba(17,24,39,.06); font-size: 13px; color: var(--muted); }
.float-card strong { display: block; color: var(--deep); margin-bottom: 2px; }
.visual-tags { display: grid; grid-template-columns: 1fr; gap: 10px; margin-top: 12px; }
.visual-tags span { background: #fff; border: 1px solid var(--line); color: var(--primary); border-radius: 14px; padding: 10px 12px; font-size: 13px; font-weight: 700; }
.section { padding: 50px 0; }
.section.soft, .gradient-bg { background: linear-gradient(180deg, #f7fbff 0%, #fff 100%); }
.section-head { margin-bottom: 22px; max-width: 780px; }
.feature-shortcuts, .category-grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
.shortcut-card, .feature-card, .category-card, .risk-card, .faq-item, .info-card, .step-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: 0 10px 26px rgba(17,24,39,.04);
}
.shortcut-card { position: relative; overflow: hidden; min-height: 150px; }
.shortcut-card:before { content: ""; position: absolute; width: 42px; height: 42px; border-radius: 14px; right: 16px; top: 16px; background: linear-gradient(145deg, var(--primary), #86b7ff); opacity: .14; }
.shortcut-card .mark { width: 34px; height: 34px; border-radius: 12px; display: inline-grid; place-items: center; background: var(--soft-blue); color: var(--primary); font-weight: 900; margin-bottom: 14px; }
.shortcut-card a, .text-link { color: var(--primary); font-weight: 800; }
.product-section, .cold-wallet-section, .swap-section, .dapp-section { display: grid; gap: 24px; align-items: center; }
.section-media { border-radius: 30px; background: var(--soft-blue); border: 1px solid var(--line); padding: 18px; box-shadow: var(--shadow); }
.section-media img { border-radius: 24px; max-height: 480px; margin: 0 auto; object-fit: contain; }
.feature-list, .clean-list { margin: 16px 0 0; padding: 0; list-style: none; display: grid; gap: 10px; }
.feature-list li, .clean-list li { position: relative; padding-left: 26px; color: #475467; }
.feature-list li:before, .clean-list li:before { content: ""; position: absolute; left: 0; top: .72em; width: 9px; height: 9px; background: var(--primary); border-radius: 50%; box-shadow: 0 0 0 4px rgba(41,128,254,.12); }
.panel { padding: 22px; border-radius: 26px; background: linear-gradient(145deg, #eef6ff, #fff); border: 1px solid var(--line); }
.process-steps { display: grid; gap: 14px; counter-reset: steps; }
.step-card { position: relative; }
.step-no { width: 38px; height: 38px; border-radius: 13px; background: var(--primary); color: #fff; display: inline-grid; place-items: center; font-weight: 900; margin-bottom: 12px; }
.risk-grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
.risk-card { border-left: 4px solid var(--primary); }
.risk-card .advice { display: block; margin-top: 10px; padding: 10px 12px; border-radius: 14px; background: var(--soft); color: #344054; }
.faq-list { display: grid; gap: 14px; }
.faq-item h3 { margin-bottom: 8px; }
.cta-section { padding: 54px 0; background: linear-gradient(135deg, #eef6ff, #fff 50%, #f5f8fc); text-align: center; }
.cta-box { max-width: 760px; margin: 0 auto; padding: 28px; border-radius: 30px; background: rgba(255,255,255,.86); border: 1px solid var(--line); box-shadow: var(--shadow); }
.page-hero { padding: 42px 0 30px; background: linear-gradient(180deg, #f7fbff 0%, #fff 100%); }
.page-hero .summary { max-width: 790px; font-size: 16px; }
.content-layout { display: grid; gap: 24px; align-items: start; }
.article-card { background: #fff; border: 1px solid var(--line); border-radius: 28px; padding: 22px; box-shadow: 0 14px 36px rgba(17,24,39,.04); }
.article-card p + p { margin-top: 12px; }
.side-panel { display: grid; gap: 14px; }
.note-box { padding: 18px; border-radius: 22px; background: var(--soft-blue); border: 1px solid rgba(41,128,254,.16); color: #475467; }
.check-grid { display: grid; gap: 12px; margin-top: 18px; }
.check-item { padding: 14px 16px; border-radius: 18px; background: var(--soft); border: 1px solid var(--line); }
.download-center { margin-top: 22px; }
.download-flow { display: grid; gap: 12px; margin-top: 20px; }
.download-flow .step-card { display: flex; gap: 14px; align-items: flex-start; }
.site-footer { padding: 42px 0 0; background: #111827; color: #d0d5dd; }
.site-footer p { color: #98a2b3; }
.footer-grid { display: grid; gap: 24px; }
.site-footer h3 { color: #fff; font-size: 16px; }
.site-footer a { display: block; color: #d0d5dd; margin: 8px 0; }
.footer-logo { color: #fff; margin-bottom: 12px; }
.footer-bottom { margin-top: 26px; padding: 18px 0; border-top: 1px solid rgba(255,255,255,.12); color: #98a2b3; font-size: 13px; }
@media (min-width: 640px) {
  .feature-shortcuts { grid-template-columns: repeat(2, 1fr); }
  .category-grid { grid-template-columns: repeat(2, 1fr); }
  .risk-grid { grid-template-columns: repeat(2, 1fr); }
  .visual-tags { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 900px) {
  .nav-toggle { display: none; }
  .site-nav { display: flex; position: static; padding: 0; border: 0; box-shadow: none; background: transparent; align-items: center; gap: 2px; }
  .site-nav a { padding: 8px 10px; }
  .hero-grid, .product-section, .swap-section { grid-template-columns: 1.05fr .95fr; }
  .cold-wallet-section, .dapp-section { grid-template-columns: .95fr 1.05fr; }
  .cold-wallet-section .section-media, .dapp-section .section-media { order: 1; }
  .cold-wallet-section .section-copy, .dapp-section .section-copy { order: 2; }
  .feature-shortcuts { grid-template-columns: repeat(3, 1fr); }
  .process-steps { grid-template-columns: repeat(3, 1fr); }
  .category-grid { grid-template-columns: repeat(4, 1fr); }
  .risk-grid { grid-template-columns: repeat(3, 1fr); }
  .content-layout { grid-template-columns: minmax(0, 1fr) 330px; }
  .footer-grid { grid-template-columns: 1.4fr .8fr .8fr; }
  .article-card { padding: 30px; }
  .section { padding: 72px 0; }
  .product-hero { padding: 72px 0 56px; }
}
@media (min-width: 1120px) {
  .feature-shortcuts { grid-template-columns: repeat(6, 1fr); }
  .site-nav a { padding: 8px 12px; }
}