:root {
  --primary: #2980FE;
  --primary-dark: #0f63dc;
  --bg: #ffffff;
  --soft: #f5f8fc;
  --soft-blue: #eef6ff;
  --line: #e5ebf3;
  --text: #1f2937;
  --muted: #667085;
  --deep: #111827;
  --card: #ffffff;
  --shadow: 0 16px 46px rgba(31, 41, 55, .08);
  --radius-lg: 28px;
  --radius: 20px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", "Microsoft JhengHei", Arial, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #fff 0%, #f7fbff 42%, #fff 100%);
  line-height: 1.72;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .9);
  border-bottom: 1px solid rgba(229, 235, 243, .9);
  backdrop-filter: blur(16px);
}
.header-inner,
.container,
.footer-inner {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
}
.header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand,
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  color: var(--deep);
  letter-spacing: -.02em;
}
.logo-img,
.footer-brand img {
  width: 38px;
  height: 38px;
  object-fit: contain;
  border-radius: 12px;
}
.nav-toggle {
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--deep);
  border-radius: 14px;
  font-size: 22px;
}
.main-nav {
  display: none;
  position: absolute;
  left: 16px;
  right: 16px;
  top: 78px;
  padding: 12px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow);
}
.main-nav.is-open { display: grid; gap: 4px; }
.main-nav a {
  padding: 11px 12px;
  border-radius: 12px;
  color: #344054;
  font-size: 15px;
}
.main-nav a:hover { background: var(--soft-blue); color: var(--primary); }
.portal-hero {
  position: relative;
  padding: 46px 0 28px;
  overflow: hidden;
}
.portal-hero::before,
.gradient-bg::before {
  content: "";
  position: absolute;
  width: 480px;
  height: 480px;
  border-radius: 999px;
  background: radial-gradient(circle, rgba(41,128,254,.16), rgba(41,128,254,0) 70%);
  right: -180px;
  top: -140px;
  pointer-events: none;
}
.hero-grid,
.split-feature,
.article-grid,
.download-layout,
.about-grid {
  display: grid;
  gap: 28px;
  align-items: center;
}
.hero-copy {
  position: relative;
  z-index: 1;
}
.eyebrow,
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: fit-content;
  border: 1px solid rgba(41,128,254,.18);
  color: var(--primary);
  background: rgba(41,128,254,.08);
  border-radius: 999px;
  padding: 7px 12px;
  font-size: 13px;
  font-weight: 700;
}
h1,
h2,
h3 { color: var(--deep); line-height: 1.18; letter-spacing: -.035em; margin: 0; }
h1 { font-size: clamp(34px, 7vw, 64px); margin-top: 18px; }
h2 { font-size: clamp(26px, 4.5vw, 42px); }
h3 { font-size: 20px; }
p { margin: 0; color: var(--muted); }
.lead { font-size: 17px; margin: 18px 0 24px; max-width: 650px; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; }
.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 13px 24px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-weight: 800;
  box-shadow: 0 14px 30px 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 18px 36px rgba(41,128,254,.32); }
.security-tags,
.hero-tags,
.inline-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.security-tags span,
.hero-tags span,
.inline-tags span {
  padding: 9px 12px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--line);
  color: #344054;
  font-size: 13px;
  box-shadow: 0 8px 22px rgba(31,41,55,.04);
}
.hero-visual {
  position: relative;
  min-height: 410px;
  display: grid;
  place-items: center;
  padding: 22px;
  border: 1px solid rgba(41,128,254,.12);
  border-radius: 32px;
  background: linear-gradient(145deg, rgba(238,246,255,.9), #fff 62%);
  box-shadow: var(--shadow);
}
.hero-visual .product-img {
  max-height: 360px;
  margin: 0 auto;
  filter: drop-shadow(0 22px 30px rgba(31,41,55,.12));
}
.float-card,
.portal-stat {
  position: static;
  margin-top: 12px;
  width: 100%;
  padding: 14px 16px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.92);
  box-shadow: 0 12px 32px rgba(31,41,55,.08);
}
.float-card strong,
.portal-stat strong { display: block; color: var(--deep); }
.float-card small,
.portal-stat small { color: var(--muted); }
.section { padding: 44px 0; position: relative; }
.section-head { margin-bottom: 24px; display: grid; gap: 10px; }
.section-head.center { text-align: center; justify-items: center; }
.channel-nav,
.category-grid,
.risk-grid,
.faq-grid,
.feature-grid,
.check-grid,
.process-steps,
.info-grid {
  display: grid;
  gap: 16px;
}
.channel-card,
.category-card,
.risk-card,
.faq-item,
.feature-card,
.info-card,
.step-card,
.tip-card,
.panel-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: 0 10px 30px rgba(31,41,55,.05);
}
.channel-card {
  position: relative;
  overflow: hidden;
}
.channel-card::before,
.risk-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 4px;
  background: var(--primary);
}
.channel-card .tag,
.category-card .tag,
.risk-card .tag {
  display: inline-flex;
  margin-bottom: 12px;
  color: var(--primary);
  font-weight: 800;
  font-size: 13px;
}
.card-link,
.text-link {
  display: inline-flex;
  margin-top: 14px;
  color: var(--primary);
  font-weight: 800;
}
.split-feature {
  padding: 26px;
  border-radius: 32px;
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: var(--shadow);
}
.split-feature.alt,
.cold-wallet-split { background: linear-gradient(135deg, #f6faff, #fff); }
.split-media {
  border-radius: 26px;
  min-height: 260px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, rgba(41,128,254,.08), #fff);
  border: 1px solid rgba(41,128,254,.12);
  overflow: hidden;
}
.split-media img { max-height: 310px; object-fit: contain; padding: 16px; }
.split-content { display: grid; gap: 16px; }
.check-list,
.clean-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}
.check-list li,
.clean-list li {
  position: relative;
  padding-left: 26px;
  color: #475467;
}
.check-list li::before,
.clean-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 9px;
  height: 9px;
  border-radius: 999px;
  background: var(--primary);
  box-shadow: 0 0 0 4px rgba(41,128,254,.12);
}
.safety-panel {
  padding: 24px;
  border-radius: 28px;
  background: linear-gradient(135deg, #eef6ff, #fff);
  border: 1px solid rgba(41,128,254,.14);
}
.process-steps { counter-reset: step; }
.step-card { position: relative; padding-top: 54px; }
.step-card::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  top: 18px;
  left: 20px;
  color: var(--primary);
  font-weight: 900;
  font-size: 20px;
}
.ecosystem-category .category-card { min-height: 180px; }
.faq-item h3 { margin-bottom: 8px; font-size: 18px; }
.cta-section {
  text-align: center;
  padding: 46px 22px;
  border-radius: 32px;
  background: linear-gradient(135deg, #edf6ff, #fff);
  border: 1px solid rgba(41,128,254,.14);
  box-shadow: var(--shadow);
}
.cta-section p { max-width: 720px; margin: 14px auto 24px; }
.page-hero {
  padding: 44px 0 28px;
  background: linear-gradient(180deg, #fff, #f7fbff);
}
.page-hero .lead { margin-bottom: 0; }
.article-grid { align-items: start; }
.article-body {
  display: grid;
  gap: 18px;
}
.article-body p { font-size: 16px; }
.side-panel {
  display: grid;
  gap: 16px;
}
.download-layout { align-items: start; }
.number-list {
  margin: 0;
  padding-left: 22px;
  color: #475467;
}
.number-list li { margin-bottom: 10px; }
.site-footer {
  margin-top: 56px;
  padding: 38px 0;
  background: #f6f9fd;
  border-top: 1px solid var(--line);
}
.footer-inner { display: grid; gap: 26px; }
.footer-inner p { max-width: 650px; margin-top: 12px; }
.footer-links { display: grid; gap: 10px; }
.footer-links a { color: #475467; font-weight: 700; }
.footer-links a:hover { color: var(--primary); }
.code-panel {
  background: #0f172a;
  color: #dbeafe;
  border-radius: 24px;
  padding: 20px;
  overflow: hidden;
  border: 1px solid rgba(41,128,254,.18);
}
.code-panel code { display: block; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 13px; line-height: 1.8; white-space: pre-wrap; }
@media (min-width: 640px) {
  .channel-nav,
  .category-grid,
  .risk-grid,
  .faq-grid,
  .feature-grid,
  .check-grid,
  .info-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 860px) {
  .nav-toggle { display: none; }
  .main-nav {
    display: flex;
    position: static;
    padding: 0;
    border: 0;
    box-shadow: none;
    background: transparent;
    gap: 2px;
    align-items: center;
  }
  .main-nav a { font-size: 14px; padding: 9px 10px; }
  .hero-grid,
  .split-feature,
  .download-layout,
  .about-grid { grid-template-columns: 1.04fr .96fr; }
  .split-feature.reverse { grid-template-columns: .96fr 1.04fr; }
  .split-feature.reverse .split-media { order: -1; }
  .article-grid { grid-template-columns: minmax(0, 1fr) 330px; }
  .portal-hero { padding: 72px 0 36px; }
  .section { padding: 62px 0; }
  .channel-nav { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .process-steps { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .float-card { position: absolute; width: 210px; margin: 0; }
  .float-card.one { left: 22px; top: 28px; }
  .float-card.two { right: 22px; top: 70px; }
  .float-card.three { left: 34px; bottom: 42px; }
  .float-card.four { right: 34px; bottom: 34px; }
  .portal-stat { position: absolute; left: 50%; bottom: 18px; transform: translateX(-50%); width: 240px; margin: 0; }
}
@media (min-width: 1060px) {
  .category-grid.ecosystem-category { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .risk-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .faq-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .feature-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer-inner { grid-template-columns: 1fr 280px; align-items: start; }
}