:root {
  --primary: #2980FE;
  --primary-dark: #1767d8;
  --text: #1f2937;
  --muted: #64748b;
  --line: #e5eaf2;
  --soft: #f5f8fc;
  --blue-soft: #eef6ff;
  --white: #ffffff;
  --shadow: 0 18px 50px rgba(31, 41, 55, .08);
  --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: linear-gradient(180deg, #fff 0%, #f7fbff 42%, #fff 100%);
  line-height: 1.75;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}
.header-inner { width: min(1180px, calc(100% - 28px)); margin: 0 auto; min-height: 66px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; color: #0f172a; letter-spacing: -.02em; }
.brand-logo { width: 38px; height: 38px; border-radius: 12px; object-fit: contain; background: var(--blue-soft); }
.nav-toggle { display: inline-flex; align-items: center; justify-content: center; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 12px; background: var(--white); color: var(--text); font-size: 20px; }
.primary-nav { display: none; position: absolute; left: 14px; right: 14px; top: 68px; padding: 12px; background: var(--white); border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); }
.primary-nav.is-open { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.primary-nav a { padding: 10px 12px; border-radius: 12px; color: #334155; font-size: 14px; }
.primary-nav a:hover { background: var(--blue-soft); color: var(--primary); }
.product-hero { position: relative; padding: 52px 0 30px; overflow: hidden; }
.product-hero::before { content: ""; position: absolute; width: 420px; height: 420px; right: -160px; top: -140px; background: radial-gradient(circle, rgba(41,128,254,.22), transparent 68%); }
.hero-grid { display: grid; gap: 34px; align-items: center; position: relative; }
.eyebrow, .badge { display: inline-flex; align-items: center; width: fit-content; gap: 8px; padding: 6px 12px; border-radius: 999px; background: var(--blue-soft); color: var(--primary); font-weight: 700; font-size: 13px; }
h1 { margin: 14px 0 14px; font-size: clamp(32px, 9vw, 64px); line-height: 1.08; letter-spacing: -.05em; color: #0f172a; }
h2 { margin: 0 0 14px; font-size: clamp(25px, 5vw, 40px); line-height: 1.18; letter-spacing: -.035em; color: #0f172a; }
h3 { margin: 0 0 8px; font-size: 19px; line-height: 1.35; color: #0f172a; }
p { margin: 0 0 14px; color: #475569; }
.lead { font-size: 18px; color: #475569; max-width: 720px; }
.hero-tags, .tag-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.hero-tags span, .tag-row span { padding: 8px 11px; border: 1px solid #dbeafe; background: #fff; color: #2563eb; border-radius: 999px; font-size: 13px; font-weight: 700; }
.download-btn { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 24px; margin-top: 14px; border-radius: 999px; background: var(--primary); color: #fff; font-weight: 800; box-shadow: 0 14px 30px rgba(41,128,254,.22); transition: transform .2s, background .2s, box-shadow .2s; }
.download-btn:hover { transform: translateY(-2px); background: var(--primary-dark); box-shadow: 0 18px 42px rgba(41,128,254,.25); }
.app-visual { position: relative; padding: 22px; border-radius: 30px; background: linear-gradient(145deg, #fff, #edf6ff); border: 1px solid #dcecff; box-shadow: var(--shadow); }
.phone-frame { max-width: 330px; margin: 0 auto; padding: 16px; border-radius: 34px; background: #fff; border: 1px solid #dce7f5; box-shadow: inset 0 0 0 8px #f8fafc; }
.float-card { position: relative; margin-top: 12px; padding: 14px; border-radius: 18px; background: rgba(255,255,255,.94); border: 1px solid #dbeafe; box-shadow: 0 12px 28px rgba(15,23,42,.07); font-size: 14px; color: #475569; }
.float-card strong { color: #0f172a; display: block; }
.section { padding: 58px 0; }
.section.soft { background: var(--soft); }
.section-head { max-width: 760px; margin-bottom: 24px; }
.feature-shortcuts { display: grid; grid-template-columns: 1fr; gap: 14px; }
.feature-card, .category-card, .risk-card, .faq-item, .info-card, .step-card { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; box-shadow: 0 10px 28px rgba(15,23,42,.04); }
.feature-card .icon { width: 36px; height: 36px; border-radius: 12px; display: grid; place-items: center; color: var(--primary); background: var(--blue-soft); font-weight: 900; margin-bottom: 12px; }
.feature-card a, .category-card a, .risk-card a, .text-link { color: var(--primary); font-weight: 800; }
.product-section, .cold-wallet-section, .swap-section, .dapp-section { display: grid; gap: 26px; align-items: center; }
.visual-panel { border-radius: 28px; padding: 24px; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow); }
.visual-panel.blue { background: linear-gradient(145deg, #f8fbff, #eef6ff); }
.check-list { list-style: none; padding: 0; margin: 16px 0 0; display: grid; gap: 10px; }
.check-list li { position: relative; padding-left: 28px; color: #475569; }
.check-list li::before { content: "✓"; position: absolute; left: 0; top: 0; width: 20px; height: 20px; display: grid; place-items: center; border-radius: 50%; color: #fff; background: var(--primary); font-size: 12px; font-weight: 800; }
.process-steps { display: grid; gap: 14px; counter-reset: step; }
.step-card { position: relative; padding-top: 26px; }
.step-number { width: 38px; height: 38px; border-radius: 14px; display: grid; place-items: center; background: var(--primary); color: #fff; font-weight: 900; margin-bottom: 12px; }
.risk-grid, .category-grid, .info-grid, .faq-grid { display: grid; gap: 14px; }
.risk-card { border-left: 4px solid var(--primary); }
.cta-section { margin: 56px auto; padding: 34px 22px; border-radius: 30px; background: linear-gradient(135deg, #eef6ff, #ffffff); border: 1px solid #dcecff; text-align: center; box-shadow: var(--shadow); }
.page-hero { padding: 50px 0 28px; background: linear-gradient(180deg, #f8fbff, #fff); border-bottom: 1px solid var(--line); }
.page-layout { display: grid; gap: 22px; padding: 42px 0 60px; }
.article-body { background: #fff; border: 1px solid var(--line); border-radius: 28px; padding: 24px; box-shadow: var(--shadow); }
.article-body h2 { font-size: 26px; margin-top: 22px; }
.side-panel { background: #f8fbff; border: 1px solid #dcecff; border-radius: 24px; padding: 20px; align-self: start; }
.note-box { padding: 18px; border-radius: 18px; background: var(--blue-soft); border: 1px solid #d7eafe; color: #334155; margin: 18px 0; }
.download-wrap { margin-top: 20px; }
.faq-item details { display: block; }
.faq-item summary { cursor: pointer; font-weight: 800; color: #0f172a; }
.faq-item p { margin-top: 10px; }
.site-footer { background: #0f172a; color: #e2e8f0; padding-top: 42px; }
.footer-grid { display: grid; gap: 28px; }
.footer-brand { font-size: 22px; font-weight: 900; margin-bottom: 10px; }
.site-footer h3 { color: #fff; font-size: 16px; }
.site-footer p, .site-footer a { color: #cbd5e1; }
.site-footer a { display: block; margin: 8px 0; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); margin-top: 28px; padding: 18px 16px; text-align: center; color: #94a3b8; font-size: 14px; }
@media (min-width: 640px) {
  .feature-shortcuts { grid-template-columns: repeat(2, 1fr); }
  .risk-grid, .category-grid, .info-grid, .faq-grid { grid-template-columns: repeat(2, 1fr); }
  .process-steps { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 900px) {
  .nav-toggle { display: none; }
  .primary-nav { position: static; display: flex; align-items: center; gap: 4px; padding: 0; border: 0; box-shadow: none; background: transparent; }
  .hero-grid, .product-section, .cold-wallet-section, .swap-section, .dapp-section { grid-template-columns: 1.05fr .95fr; }
  .cold-wallet-section, .dapp-section.reverse { grid-template-columns: .95fr 1.05fr; }
  .feature-shortcuts { grid-template-columns: repeat(3, 1fr); }
  .category-grid { grid-template-columns: repeat(4, 1fr); }
  .risk-grid { grid-template-columns: repeat(3, 1fr); }
  .process-steps { grid-template-columns: repeat(3, 1fr); }
  .page-layout { grid-template-columns: minmax(0, 1fr) 310px; }
  .article-body { padding: 34px; }
  .footer-grid { grid-template-columns: 1.5fr 1fr 1fr; }
}
@media (min-width: 1120px) {
  .feature-shortcuts { grid-template-columns: repeat(6, 1fr); }
}