*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:#F3F8FD;color:#24384C;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;font-size:16px;line-height:1.75;overflow-x:hidden}
body.is-locked{overflow:hidden}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
img{max-width:100%;display:block}
button{border:0}
:focus-visible{outline:3px solid #E8C9A0;outline-offset:3px}
.tide-line{position:fixed;top:0;left:0;right:0;height:8px;background:#3D7EA6;color:#fff;z-index:1200}
.tide-line-inner{max-width:1120px;height:8px;margin:0 auto;padding:0 16px;display:flex;align-items:center;justify-content:space-between;font-size:0}
.brand-mini,.text-control{font-size:0;width:1px;height:1px;overflow:hidden;opacity:0}
.text-control{cursor:pointer}
.tide-platform{position:fixed;top:8px;left:0;right:0;height:50px;background:#fff;border-bottom:1px solid rgba(14,58,92,.12);z-index:1190}
.tide-platform-inner{max-width:1120px;height:100%;margin:0 auto;padding:0 16px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand-lockup{display:flex;align-items:center;min-height:44px}
.brand-logo{height:26px;max-width:180px;object-fit:contain}
.brand-text{font-weight:800;color:#0E3A5C;font-size:20px;letter-spacing:.03em}
.platform-actions{display:flex;align-items:center;gap:8px}
.menu-button,.app-button{min-height:44px;padding:0 16px;border-radius:10px;display:inline-flex;align-items:center;justify-content:center;font-weight:700}
.menu-button{background:#fff;border:1px solid #5BA3D0;color:#0E3A5C;cursor:pointer}
.app-button{background:#3D7EA6;color:#fff}
.tide-bridge{position:fixed;top:58px;left:0;right:0;height:64px;background:#C5E4F5;z-index:1180;border-bottom:1px solid rgba(14,58,92,.12)}
.tide-bridge-inner{height:100%;max-width:1120px;margin:0 auto;display:grid;grid-template-columns:repeat(5,1fr)}
.tide-bridge a{display:flex;align-items:center;justify-content:center;font-weight:800;color:#0E3A5C;border-right:1px solid rgba(255,255,255,.85)}
.tide-bridge a:first-child{border-left:1px solid rgba(255,255,255,.85)}
.tide-bridge a:hover,.tide-bridge a.is-active{background:#fff;color:#0E3A5C}
.site-main{padding-top:146px;min-height:70vh}
.container{width:min(1120px,calc(100% - 32px));margin:0 auto}
.hero,.page-hero,.section-card,.info-card,.topic-card,.faq-item{background:#fff;border:1px solid rgba(14,58,92,.12);box-shadow:0 14px 34px rgba(14,58,92,.10);border-radius:12px}
.hero{padding:20px;margin-bottom:28px}
.cover-slot{background:#DCEAF6;border-radius:12px;min-height:150px;max-height:200px;display:flex;align-items:center;justify-content:center;overflow:hidden}
.cover-image{max-height:200px;width:100%;object-fit:contain;object-position:center}
.image-fallback{background:linear-gradient(135deg,#DCEAF6,#F3F8FD);border:1px dashed rgba(14,58,92,.16);min-height:150px;border-radius:12px}
.hero-copy{padding:18px 4px 2px}
.eyebrow{display:block;color:#3D7EA6;font-weight:800;letter-spacing:.08em;font-size:13px}
h1,h2,h3{color:#0E3A5C;line-height:1.35;margin:0 0 12px}
h1{font-size:clamp(28px,3vw,32px)}
h2{font-size:24px}
h3{font-size:19px}
p{margin:0 0 14px}
.button-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
.button{min-height:44px;padding:10px 16px;border-radius:10px;display:inline-flex;align-items:center;justify-content:center;font-weight:800}
.button.primary{background:#3D7EA6;color:#fff}
.button.secondary{background:#fff;border:1px solid #5BA3D0;color:#0E3A5C}
.section{margin:0 0 28px}
.section-heading{display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:14px}
.section-heading p{max-width:660px;color:#5A7388;margin:0}
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.topic-card{padding:16px;display:flex;flex-direction:column}
.topic-card .media-frame{background:#F3F8FD;border-radius:10px;min-height:150px;height:166px;display:flex;align-items:center;justify-content:center;overflow:hidden;margin-bottom:15px}
.content-image{width:100%;height:166px;object-fit:contain;object-position:center}
.topic-card p{color:#5A7388}
.topic-card .card-link{margin-top:auto;font-weight:800;color:#3D7EA6}
.feature-card{display:grid;grid-template-columns:1.05fr .95fr;gap:20px;padding:22px;align-items:center}
.feature-card.reverse{grid-template-columns:.95fr 1.05fr}
.feature-card.reverse .feature-copy{order:2}
.feature-card.reverse .media-frame{order:1}
.feature-card .media-frame{min-height:170px;background:#F3F8FD;border-radius:10px;display:flex;align-items:center;justify-content:center;overflow:hidden}
.feature-card .content-image{height:180px}
.feature-copy p{color:#5A7388}
.feature-copy .button{margin-top:4px}
.app-showcase{display:grid;grid-template-columns:1fr 280px;gap:24px;padding:24px}
.app-showcase .app-image{height:420px;width:100%;object-fit:contain}
.mark-row{display:flex;align-items:center;gap:14px;margin:10px 0 14px}
.mark-icon{width:64px;height:64px;object-fit:contain}
.triple-info{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.info-card{padding:22px}
.info-card p{color:#5A7388}
.page-hero{padding:26px;margin-bottom:22px}
.page-hero p{max-width:820px;color:#5A7388}
.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:22px;align-items:start}
.article-main{background:#fff;border:1px solid rgba(14,58,92,.12);border-radius:12px;padding:26px;box-shadow:0 14px 34px rgba(14,58,92,.10)}
.article-main section+section{margin-top:26px;padding-top:22px;border-top:1px solid rgba(14,58,92,.12)}
.article-main ul,.article-main ol{padding-left:1.2em}
.article-aside{position:sticky;top:144px}
.aside-card{background:#DCEAF6;border-radius:12px;padding:18px;border:1px solid rgba(14,58,92,.12)}
.aside-card a{display:block;padding:10px 0;border-bottom:1px solid rgba(14,58,92,.10);font-weight:700}
.aside-card a:last-child{border-bottom:0}
.highlight-box{background:#C5E4F5;color:#0E3A5C;border-radius:12px;padding:18px;margin:18px 0}
.deep-box{background:#0E3A5C;color:#C5E4F5;border-radius:12px;padding:18px;margin:18px 0}
.deep-box h2,.deep-box h3{color:#fff}
.list-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.list-card{background:#F3F8FD;border:1px solid rgba(14,58,92,.12);border-radius:12px;padding:18px}
.faq-list{display:grid;gap:14px}
.faq-item{padding:20px}
.faq-item h2{font-size:19px}
.tide-bay{position:fixed;top:58px;left:0;width:300px;height:min(480px,calc(100vh - 58px));background:#fff;border-radius:0 0 12px 0;box-shadow:0 18px 50px rgba(14,58,92,.22);z-index:1400;visibility:hidden;opacity:0;pointer-events:none;transform:translateY(-10px);transition:.2s ease}
.tide-bay.is-open{visibility:visible;opacity:1;pointer-events:auto;transform:translateY(0)}
.bay-head{height:66px;padding:12px 14px;border-bottom:1px solid rgba(14,58,92,.12);display:flex;align-items:center;justify-content:space-between;gap:10px}
.bay-brand{display:flex;align-items:center;gap:10px}
.bay-brand div{display:flex;flex-direction:column;line-height:1.2}
.bay-brand span{font-size:11px;color:#7A93A8}
.icon-close{width:44px;height:44px;border-radius:10px;background:#F3F8FD;color:#0E3A5C;cursor:pointer;font-size:24px}
.bay-scroll{height:calc(100% - 66px);overflow:auto;padding:12px 14px 18px}
.bay-group{margin-bottom:14px}
.bay-group h2{font-size:13px;color:#7A93A8;margin-bottom:4px}
.bay-group a{display:block;padding:9px 0;border-bottom:1px solid rgba(14,58,92,.08)}
.bay-group strong{display:block;color:#0E3A5C;font-size:14px}
.bay-group span{display:block;color:#5A7388;font-size:12px;line-height:1.5;margin-top:2px}
.search-panel{position:fixed;top:58px;left:max(16px,calc((100vw - 1120px)/2));width:min(440px,calc(100vw - 32px));background:#fff;border:1px solid rgba(14,58,92,.12);border-radius:0 0 12px 12px;box-shadow:0 18px 50px rgba(14,58,92,.22);padding:18px;z-index:1400;visibility:hidden;opacity:0;pointer-events:none;transform:translateY(-10px);transition:.2s ease}
.search-panel.is-open{visibility:visible;opacity:1;pointer-events:auto;transform:translateY(0)}
.search-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px}
.search-head strong{display:block;color:#0E3A5C;line-height:1.5}
.search-look{min-height:48px;margin:16px 0;background:#F3F8FD;border:1px solid rgba(14,58,92,.12);border-radius:10px;padding:11px 14px;color:#7A93A8}
.preset-links{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}
.preset-links a{min-height:44px;display:flex;align-items:center;padding:8px 12px;border:1px solid #5BA3D0;border-radius:10px;color:#0E3A5C;font-weight:700}
.site-overlay{position:fixed;inset:0;background:rgba(14,58,92,.28);z-index:1300;visibility:hidden;opacity:0;pointer-events:none;transition:.2s ease}
.site-overlay.is-open{visibility:visible;opacity:1;pointer-events:auto}
.site-footer{background:#0E3A5C;color:#C5E4F5;margin-top:40px}
.footer-inner{max-width:1120px;margin:0 auto;padding:34px 16px 26px}
.footer-brand{display:flex;align-items:center;gap:12px;margin-bottom:22px}
.footer-brand strong{display:block;color:#fff;font-size:20px}
.footer-brand span{font-size:12px;color:#C5E4F5}
.footer-logo{filter:brightness(0) invert(1);opacity:.95}
.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.footer-grid h2{font-size:15px;color:#fff;margin-bottom:8px}
.footer-grid a{display:block;color:#C5E4F5;padding:5px 0}
.footer-note{margin-top:22px;padding-top:18px;border-top:1px solid rgba(197,228,245,.25);color:#C5E4F5}
.copyright{color:#fff;margin-bottom:0}
.mobile-bottom-nav{display:none}
@media (max-width:820px){
  .tide-bridge{display:none}
  .site-main{padding-top:82px}
  .card-grid,.triple-info,.list-cards{grid-template-columns:1fr}
  .feature-card,.feature-card.reverse,.app-showcase,.article-layout{grid-template-columns:1fr}
  .feature-card.reverse .feature-copy,.feature-card.reverse .media-frame{order:initial}
  .article-aside{position:static}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
  .app-showcase .app-image{height:360px}
}
@media (max-width:640px){
  body{padding-bottom:calc(50px + env(safe-area-inset-bottom))}
  .tide-platform-inner{padding:0 12px}
  .menu-button,.app-button{padding:0 12px}
  .brand-logo{max-width:140px;height:24px}
  .tide-bay{top:58px;left:0;width:calc(100vw - 12px);height:62vh;border-radius:0 0 12px 0}
  .search-panel{top:58px;left:8px;width:calc(100vw - 16px)}
  .container{width:calc(100% - 32px)}
  .hero{padding:14px}
  .feature-card,.app-showcase,.article-main,.page-hero{padding:18px}
  .cover-slot{min-height:130px}
  .section-heading{display:block}
  .section-heading p{margin-top:8px}
  .footer-grid{grid-template-columns:1fr 1fr}
  .mobile-bottom-nav{position:fixed;left:0;right:0;bottom:0;height:calc(50px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:#fff;border-top:1px solid rgba(14,58,92,.12);z-index:1250;display:grid;grid-template-columns:repeat(5,1fr)}
  .mobile-bottom-nav a{display:flex;align-items:center;justify-content:center;min-height:50px;color:#0E3A5C;font-size:13px;font-weight:800}
  .mobile-bottom-nav a.is-active{background:#3D7EA6;color:#fff}
}