:root {
  --dybiz-bg: #ffffff;
  --dybiz-surface: #f8f8f8;
  --dybiz-border: #e5e5e5;
  --dybiz-text: #111111;
  --dybiz-muted: #666666;
  --dybiz-accent: #00e5ff;
  --dybiz-radius: 4px;
}
* { margin:0; padding:0; box-sizing:border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--dybiz-bg);
  color: var(--dybiz-text);
  line-height: 1.75;
  font-size: 15px;
}
.dybiz-wrapper { max-width: 1120px; margin: 0 auto; padding: 0 20px; }
.dybiz-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.96); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--dybiz-border);
}
.dybiz-header-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 0; max-width: 1120px; margin: 0 auto; padding-left:20px; padding-right:20px;
}
.dybiz-logo {
  font-size: 19px; font-weight: 700; letter-spacing: -0.4px;
}
.dybiz-nav {
  display: flex; align-items: center; gap: 26px;
}
.dybiz-nav a {
  color: var(--dybiz-muted); text-decoration: none; font-size: 14px; font-weight: 500;
  transition: color 0.2s ease;
}
.dybiz-nav a:hover { color: var(--dybiz-text); }
.dybiz-cta-btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 10px 24px; background: var(--dybiz-accent); color: #111;
  font-size: 14px; font-weight: 700; text-decoration: none; border-radius: var(--dybiz-radius);
  transition: all 0.2s ease;
}
.dybiz-cta-btn:hover { background: #00c8e0; transform: translateY(-1px); }
.dybiz-hero {
  padding: 88px 0 56px; text-align: center; border-bottom: 1px solid var(--dybiz-border);
}
.dybiz-hero-title {
  font-size: 2.8rem; line-height: 1.15; font-weight: 700; letter-spacing: -1.3px;
  max-width: 960px; margin: 0 auto 22px;
}
.dybiz-hero-lead {
  font-size: 15.5px; color: var(--dybiz-muted); max-width: 620px; margin: 0 auto 32px;
}
.dybiz-hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-bottom: 42px; }
.dybiz-index-bar {
  max-width: 820px; margin: 0 auto;
  background: var(--dybiz-surface); border: 1px solid var(--dybiz-border);
  border-radius: var(--dybiz-radius); padding: 18px 28px;
}
.dybiz-index-row {
  display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap;
}
.dybiz-index-item { text-align: center; flex: 1; min-width: 120px; }
.dybiz-index-value { font-size: 22px; font-weight: 700; color: var(--dybiz-accent); display: block; }
.dybiz-index-label { font-size: 12px; color: var(--dybiz-muted); margin-top: 3px; }
.dybiz-section { padding: 64px 0; }
.dybiz-chapter { font-size: 13px; font-weight: 700; color: var(--dybiz-accent); letter-spacing: 2px; margin-bottom: 8px; }
.dybiz-section-header h2 {
  font-size: 1.65rem; font-weight: 700; line-height: 1.3; margin-bottom: 8px;
}
.dybiz-asym-grid {
  display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 24px; align-items: start;
}
.dybiz-asym-grid p { color: var(--dybiz-muted); }
.dybiz-mini-module {
  background: var(--dybiz-surface); border: 1px solid var(--dybiz-border);
  border-radius: var(--dybiz-radius); padding: 18px; margin-bottom: 12px;
}
.dybiz-mini-module:last-child { margin-bottom: 0; }
.dybiz-mini-module h4 { font-size: 14px; font-weight: 600; margin-bottom: 6px; }
.dybiz-mini-module p { font-size: 13.5px; color: var(--dybiz-muted); }
.dybiz-path-map {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 16px;
  position: relative;
}
.dybiz-path-node {
  background: var(--dybiz-surface); border: 1px solid var(--dybiz-border);
  border-radius: var(--dybiz-radius); padding: 20px; position: relative;
}
.dybiz-path-node::before {
  content: ''; position: absolute; top: -1px; left: 24px; right: 24px; height: 3px;
  background: var(--dybiz-accent); opacity: 0.15;
}
.dybiz-path-num {
  display: inline-block; width: 24px; height: 24px; background: var(--dybiz-accent);
  color: #111; font-size: 12px; font-weight: 700; text-align: center; line-height: 24px;
  border-radius: 50%; margin-bottom: 12px;
}
.dybiz-path-node h4 { font-size: 14.5px; font-weight: 600; margin-bottom: 6px; }
.dybiz-path-node p { font-size: 13.5px; color: var(--dybiz-muted); }
.dybiz-tag-matrix {
  display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px;
}
.dybiz-tag {
  display: inline-block; padding: 5px 14px; background: var(--dybiz-surface);
  border: 1px solid var(--dybiz-border); border-radius: 999px; font-size: 13px; color: var(--dybiz-text);
}
.dybiz-evidence-wall {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px;
}
.dybiz-evidence-item {
  background: var(--dybiz-surface); border: 1px solid var(--dybiz-border);
  border-radius: var(--dybiz-radius); padding: 22px; text-align: center;
}
.dybiz-evidence-num { font-size: 28px; font-weight: 700; color: var(--dybiz-accent); display: block; }
.dybiz-evidence-label { font-size: 13px; color: var(--dybiz-muted); margin-top: 6px; }
.dybiz-faq { margin-top: 8px; }
.dybiz-faq details {
  background: var(--dybiz-surface); border: 1px solid var(--dybiz-border);
  border-radius: var(--dybiz-radius); margin-bottom: 10px; overflow: hidden;
}
.dybiz-faq summary {
  padding: 17px 22px; font-weight: 600; font-size: 15px; cursor: pointer;
  list-style: none; display: flex; justify-content: space-between; align-items: center;
  border-left: 4px solid var(--dybiz-accent);
}
.dybiz-faq summary::-webkit-details-marker { display: none; }
.dybiz-faq summary:after {
  content: "+"; font-size: 18px; color: var(--dybiz-accent); transition: transform 0.2s ease;
}
.dybiz-faq details[open] summary:after { content: "−"; }
.dybiz-faq details[open] { border-color: #d4d4d4; }
.dybiz-faq p { padding: 0 22px 18px 26px; color: var(--dybiz-muted); font-size: 14px; }
.dybiz-footer {
  background: #f1f1f1; border-top: 1px solid var(--dybiz-border);
  padding: 48px 0 28px; font-size: 13px; color: var(--dybiz-muted);
}
.dybiz-footer-grid {
  display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 38px;
}
.dybiz-footer h4 { color: var(--dybiz-text); font-size: 14px; margin-bottom: 12px; font-weight: 600; }
.dybiz-footer a { color: var(--dybiz-muted); text-decoration: none; display: block; margin-bottom: 7px; }
.dybiz-footer a:hover { color: var(--dybiz-text); }
.dybiz-copyright { text-align: center; margin-top: 40px; padding-top: 22px; border-top: 1px solid var(--dybiz-border); }
@media (max-width: 820px) {
  .dybiz-hero-title { font-size: 2.3rem; }
  .dybiz-asym-grid { grid-template-columns: 1fr; }
  .dybiz-nav { gap: 15px; }
  .dybiz-header-inner { padding-left: 16px; padding-right: 16px; }
  .dybiz-wrapper { padding: 0 16px; }
  .dybiz-section { padding: 52px 0; }
  .dybiz-footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .dybiz-path-map { grid-template-columns: 1fr; }
}