:root {
  --primary: #2980FE;
  --primary-dark: #1367df;
  --ink: #1f2937;
  --muted: #667085;
  --soft: #f5f8fc;
  --soft-blue: #eef6ff;
  --line: #e4eaf2;
  --white: #ffffff;
  --shadow: 0 18px 50px rgba(41, 128, 254, 0.10);
  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 14px;
}
* { 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(--ink);
  background: linear-gradient(180deg, #ffffff 0%, #f7fbff 48%, #ffffff 100%);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--line);
}
.header-inner { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.logo, .footer-logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: -0.02em; }
.logo img, .footer-logo img { width: 34px; height: 34px; object-fit: contain; }
.nav-toggle { display: none; }
.nav-toggle-label { display: inline-flex; flex-direction: column; gap: 5px; padding: 10px; border: 1px solid var(--line); border-radius: 14px; background: #fff; }
.nav-toggle-label span { width: 22px; height: 2px; background: var(--ink); border-radius: 2px; }
.main-nav {
  position: absolute;
  left: 16px;
  right: 16px;
  top: 72px;
  display: none;
  flex-direction: column;
  gap: 8px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--white);
  box-shadow: var(--shadow);
}
.nav-toggle:checked ~ .main-nav { display: flex; }
.main-nav a { padding: 10px 12px; border-radius: 12px; color: var(--muted); font-size: 15px; }
.main-nav a:hover, .main-nav a.active { color: var(--primary); background: var(--soft-blue); }
.section { padding: 66px 0; }
.section-tight { padding: 42px 0; }
.section-eyebrow, .badge, .category-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--primary);
  background: var(--soft-blue);
  border: 1px solid rgba(41,128,254,0.16);
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
}
.section h2, .page-hero h1, .web3-hero h1 { line-height: 1.16; letter-spacing: -0.04em; margin: 14px 0 14px; }
.section h2 { font-size: clamp(28px, 4vw, 44px); }
p { color: var(--muted); margin: 0 0 16px; }
.lead { font-size: 18px; color: #4b5563; }
.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 13px 22px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-weight: 800;
  box-shadow: 0 12px 30px rgba(41,128,254,0.25);
  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 38px rgba(41,128,254,0.28); }
.link-arrow { color: var(--primary); font-weight: 800; display: inline-flex; align-items: center; gap: 6px; }
.link-arrow::after { content: '→'; }
.web3-hero {
  position: relative;
  padding: 62px 0 34px;
  overflow: hidden;
}
.web3-hero::before {
  content: '';
  position: absolute;
  inset: -160px -120px auto auto;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(41,128,254,.18), rgba(41,128,254,0) 70%);
  pointer-events: none;
}
.hero-grid { display: grid; gap: 34px; align-items: center; }
.hero-copy h1 { font-size: clamp(38px, 8vw, 70px); max-width: 760px; }
.hero-copy .lead { max-width: 660px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; margin-top: 26px; }
.security-tags, .floating-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.security-tags span, .floating-tags span, .mini-tag {
  padding: 7px 12px;
  border-radius: 999px;
  background: #fff;
  color: #344054;
  border: 1px solid var(--line);
  font-size: 14px;
  box-shadow: 0 8px 24px rgba(16,24,40,.04);
}
.hero-visual {
  position: relative;
  min-height: 360px;
  border-radius: 34px;
  padding: 26px;
  background: linear-gradient(135deg, #eff7ff 0%, #ffffff 52%, #f5f8fc 100%);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.hero-visual img { margin: 0 auto; max-height: 420px; object-fit: contain; filter: drop-shadow(0 30px 45px rgba(20,68,140,.16)); }
.floating-tags { position: relative; justify-content: center; }
.ecosystem-nav { padding: 28px 0 58px; }
.ecosystem-grid, .category-grid, .risk-grid, .faq-grid, .quick-grid, .feature-grid { display: grid; gap: 16px; }
.ecosystem-card, .feature-card, .risk-card, .faq-item, .info-card, .step-card, .quick-card, .note-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 22px;
  box-shadow: 0 10px 30px rgba(16,24,40,0.04);
}
.ecosystem-card { min-height: 170px; display: flex; flex-direction: column; justify-content: space-between; }
.ecosystem-card h3, .feature-card h3, .risk-card h3, .quick-card h3 { margin: 10px 0 8px; font-size: 21px; }
.ecosystem-card .pill, .feature-card .pill { color: var(--primary); font-size: 13px; font-weight: 800; }
.split-section, .web3-section, .hardware-wallet-section, .digital-assets-section, .swap-section, .privacy-section, .submit-chain-section, .developer-center-section {
  display: grid;
  gap: 28px;
  align-items: center;
}
.panel-soft { background: var(--soft); border-radius: 34px; padding: 28px; border: 1px solid var(--line); }
.panel-blue { background: linear-gradient(135deg, #eef6ff 0%, #ffffff 100%); border-radius: 34px; padding: 28px; border: 1px solid rgba(41,128,254,.18); }
.visual-card { background: #fff; border: 1px solid var(--line); border-radius: 30px; padding: 24px; box-shadow: var(--shadow); }
.visual-card img { margin: 0 auto; max-height: 380px; object-fit: contain; }
.check-list, .plain-list { margin: 22px 0 0; padding: 0; list-style: none; display: grid; gap: 12px; }
.check-list li, .plain-list li { position: relative; padding-left: 30px; color: #475467; }
.check-list li::before { content: '✓'; position: absolute; left: 0; top: 0; color: var(--primary); font-weight: 900; }
.plain-list li::before { content: ''; position: absolute; left: 0; top: 10px; width: 8px; height: 8px; background: var(--primary); border-radius: 50%; }
.code-panel {
  background: #f7fbff;
  color: #263445;
  border: 1px solid var(--line);
  border-radius: 26px;
  padding: 22px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  box-shadow: inset 0 0 0 1px rgba(41,128,254,.04);
  overflow: auto;
}
.code-panel span { color: var(--primary); }
.process-steps { display: grid; gap: 16px; counter-reset: steps; }
.step-card { position: relative; padding-left: 72px; min-height: 142px; }
.step-card::before {
  counter-increment: steps;
  content: counter(steps, decimal-leading-zero);
  position: absolute;
  left: 20px;
  top: 22px;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 900;
  font-size: 13px;
}
.step-card h3 { margin: 0 0 8px; }
.risk-card { border-top: 4px solid var(--primary); }
.page-hero {
  padding: 58px 0 34px;
  background: radial-gradient(circle at 84% 0%, rgba(41,128,254,.14), transparent 36%), linear-gradient(180deg, #fff, #f7fbff);
}
.page-hero h1 { font-size: clamp(34px, 7vw, 58px); max-width: 860px; }
.page-hero .summary { max-width: 760px; font-size: 18px; color: #475467; }
.content-layout { display: grid; gap: 24px; align-items: start; }
.article-card { background: #fff; border: 1px solid var(--line); border-radius: 30px; padding: 26px; box-shadow: var(--shadow); }
.article-card h2 { font-size: 28px; margin: 0 0 14px; }
.side-panel { position: relative; display: grid; gap: 14px; }
.safety-panel { background: linear-gradient(135deg, #eef6ff, #ffffff); border: 1px solid rgba(41,128,254,.18); border-radius: 26px; padding: 22px; }
.safety-panel h3 { margin: 0 0 10px; }
.cta-section { padding: 58px 0 76px; }
.cta-card {
  text-align: center;
  border: 1px solid rgba(41,128,254,.18);
  background: linear-gradient(135deg, #eef6ff 0%, #fff 52%, #f5f8fc 100%);
  border-radius: 34px;
  padding: 36px 22px;
  box-shadow: var(--shadow);
}
.cta-card h2 { margin: 0 0 12px; font-size: clamp(28px, 5vw, 44px); }
.cta-card p { max-width: 680px; margin: 0 auto 22px; }
.download-steps { display: grid; gap: 14px; margin: 28px 0; }
.download-steps .step-card { min-height: 116px; }
.faq-item h2, .faq-item h3 { margin: 0 0 8px; font-size: 20px; }
.site-footer { background: #f3f6fa; border-top: 1px solid var(--line); padding: 42px 0 24px; }
.footer-grid { display: grid; gap: 24px; }
.footer-grid h3 { margin: 0 0 12px; font-size: 16px; }
.footer-grid a:not(.footer-logo) { display: block; color: var(--muted); margin: 7px 0; font-size: 14px; }
.footer-grid p { max-width: 360px; font-size: 14px; }
.footer-bottom { display: flex; flex-direction: column; gap: 8px; margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--line); color: #667085; font-size: 13px; }
@media (min-width: 720px) {
  .ecosystem-grid { grid-template-columns: repeat(2, 1fr); }
  .category-grid, .risk-grid, .faq-grid, .quick-grid, .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .process-steps { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr 1fr; }
  .footer-bottom { flex-direction: row; justify-content: space-between; }
}
@media (min-width: 960px) {
  .nav-toggle-label { display: none; }
  .main-nav { position: static; display: flex; flex-direction: row; align-items: center; gap: 4px; padding: 0; border: 0; box-shadow: none; background: transparent; }
  .main-nav a { font-size: 14px; padding: 8px 10px; }
  .hero-grid { grid-template-columns: 1.06fr .94fr; }
  .web3-hero { padding: 92px 0 42px; }
  .ecosystem-grid { grid-template-columns: repeat(7, 1fr); }
  .ecosystem-card { grid-column: span 2; }
  .ecosystem-card:nth-child(1), .ecosystem-card:nth-child(7) { grid-column: span 3; }
  .split-section, .web3-section, .hardware-wallet-section, .digital-assets-section, .swap-section, .privacy-section, .submit-chain-section, .developer-center-section { grid-template-columns: 1fr 1fr; }
  .hardware-wallet-section .visual-card, .swap-section .visual-card { order: -1; }
  .category-grid, .feature-grid { grid-template-columns: repeat(4, 1fr); }
  .risk-grid { grid-template-columns: repeat(3, 1fr); }
  .faq-grid { grid-template-columns: repeat(2, 1fr); }
  .content-layout { grid-template-columns: minmax(0, 1fr) 330px; }
  .side-panel { position: sticky; top: 98px; }
}
@media (min-width: 1180px) {
  .main-nav a { padding: 8px 12px; }
}