:root{
  --bg:#E7F4F8;--deep-bg:#D7ECF2;--content:#F3FAFC;--secondary:#EAF6F9;--title:#163038;--text:#1F3C44;--muted:#4A6E78;--soft:#6A8C96;--blue:#7EB8E0;--cyan:#6EC9D4;--deep:#1A3A44;--white:#F3FAFC;--kelp:#5A8A6A;--border:rgba(26,58,68,.14);--border-strong:rgba(110,201,212,.50);--shadow:0 12px 28px rgba(22,48,56,.08)
}
*{box-sizing:border-box}html{scroll-behavior:smooth;background:var(--bg)}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;font-size:15px;line-height:1.7;overflow-x:hidden}a{color:inherit;text-decoration:none}button,input{font:inherit}.is-locked{overflow:hidden}.skip-link{position:fixed;left:12px;top:-60px;z-index:2000;background:var(--deep);color:var(--white);padding:10px 14px;border-radius:8px}.skip-link:focus{top:10px}.shell{width:min(1000px,calc(100% - 32px));margin-inline:auto}.site-top{position:fixed;top:0;left:0;right:0;z-index:1000;box-shadow:0 1px 0 var(--border)}.tide-brow{height:20px;background:var(--deep);color:var(--white);font-size:12px}.tide-brow-inner{height:20px;display:flex;align-items:center;justify-content:space-between}.text-button{appearance:none;border:0;background:transparent;color:var(--white);padding:0;min-height:20px;cursor:pointer}.bay-brand{height:54px;background:var(--blue);border-bottom:1px solid var(--border-strong)}.bay-brand-inner{height:54px;display:flex;align-items:center;justify-content:space-between}.brand-link{display:flex;align-items:center;min-height:44px;min-width:90px}.brand-logo,.footer-logo,.panel-logo{height:24px;max-width:160px;object-fit:contain;object-position:center}.brand-fallback{font-size:16px;font-weight:700;color:var(--deep)}.brand-actions{display:flex;align-items:center;gap:8px}.top-app-link,.menu-button{min-height:44px;display:inline-flex;align-items:center;justify-content:center;padding:0 14px;border-radius:8px;font-size:14px;color:var(--deep);border:1px solid rgba(26,58,68,.22);background:rgba(243,250,252,.52);cursor:pointer}.menu-button{appearance:none}.shore-nav{height:44px;background:var(--white);border-bottom:1px solid var(--border)}.shore-nav-inner{height:44px;display:flex;justify-content:center;gap:48px}.shore-item{min-width:74px;height:44px;display:flex;flex-direction:column;align-items:center;justify-content:center;font-size:13px;color:var(--muted);gap:2px}.shore-dot{width:6px;height:6px;border-radius:50%;background:var(--cyan)}.shore-item.is-current{color:var(--deep);font-weight:700}.shore-item.is-current .shore-dot{background:var(--deep)}.site-main{padding-top:118px;min-height:70vh}.page-wrap{padding:34px 0 64px}.page-head{margin-bottom:28px}.centered-head{text-align:center}.page-head h1,.hero-line h1{font-size:24px;line-height:1.3;color:var(--title);margin:0 0 12px}.page-head p,.hero-line p{margin:0;color:var(--muted)}h2{font-size:20px;line-height:1.4;color:var(--title)}h3{font-size:16px;color:var(--title)}p{margin:0 0 15px}.btn-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}.btn{min-height:42px;padding:0 18px;border-radius:9px;display:inline-flex;align-items:center;justify-content:center;font-size:14px;font-weight:700}.btn-primary{background:linear-gradient(135deg,var(--blue) 0%,var(--cyan) 100%);color:var(--deep);border:1px solid var(--border-strong)}.btn-secondary{background:var(--white);color:var(--deep);border:1px solid var(--deep)}.btn:hover,.top-app-link:hover,.menu-button:hover,.search-presets a:hover{transform:translateY(-1px)}a:focus-visible,button:focus-visible{outline:3px solid var(--kelp);outline-offset:3px}.media-slot{width:100%;background:var(--deep-bg);border:1px solid var(--border);border-radius:10px;display:flex;align-items:center;justify-content:center;overflow:hidden}.media-slot img{width:100%;height:100%;object-fit:contain;object-position:center}.slot-short{height:188px}.slot-banner{height:200px}.slot-app{height:min(320px,62vw)}.slot-medium{height:230px}.section{margin:34px 0}.section-card{background:var(--content);border:1px solid var(--border);border-radius:10px;box-shadow:var(--shadow);padding:24px}.hero-line{border-left:3px solid var(--cyan);padding:16px 0 16px 22px}.hero-line .lead{font-size:17px;font-weight:700;color:var(--deep);margin-bottom:10px}.interleave{display:grid;grid-template-columns:1fr;gap:14px}.interleave-block{background:var(--content);border:1px solid var(--border);border-radius:10px;padding:18px}.notes-stack{display:grid;gap:14px}.note-line{position:relative;background:var(--content);border-left:4px solid var(--cyan);padding:18px 20px;border-radius:0 10px 10px 0}.center-cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;max-width:760px;margin-inline:auto}.center-card{text-align:center;background:var(--content);border:1px solid var(--border);border-radius:12px;padding:22px}.period-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.period-grid article{background:var(--secondary);border:1px solid var(--border);border-radius:10px;padding:18px}.status-list{display:grid;gap:10px}.status-item{display:grid;grid-template-columns:120px 1fr;gap:14px;align-items:center;background:var(--content);border:1px solid var(--border);border-radius:9px;padding:14px 16px}.status-tag{font-weight:700;color:var(--deep);background:var(--deep-bg);border-radius:8px;padding:8px 10px;text-align:center}.product-band{background:var(--deep);color:var(--white);border-radius:12px;padding:26px;display:grid;grid-template-columns:minmax(0,1.35fr) minmax(210px,.65fr);gap:24px;align-items:center}.product-band h2,.product-band h1,.product-band h3{color:var(--white)}.product-band p{color:#DCEEF2}.product-band .media-slot{background:rgba(243,250,252,.08);border-color:rgba(243,250,252,.18)}.app-icon-row{display:flex;align-items:center;gap:12px;margin-bottom:14px}.app-icon{width:48px;height:48px;object-fit:contain}.article-list{display:grid;gap:18px}.article-list article{background:var(--content);border:1px solid var(--border);border-radius:10px;padding:22px}.article-list h2{margin-top:0}.faq-grid{display:grid;gap:14px}.faq-item{background:var(--content);border:1px solid var(--border);border-radius:10px;padding:20px}.faq-item h2{font-size:17px;margin:0 0 10px}.about-banner{margin-bottom:24px}.text-columns{columns:2;column-gap:36px}.text-columns p{break-inside:avoid}.compact-links{display:flex;flex-wrap:wrap;gap:10px}.compact-links a{min-height:40px;padding:0 14px;border:1px solid var(--border);border-radius:8px;background:var(--content);display:inline-flex;align-items:center}.checklist{display:grid;gap:10px}.check-item{background:var(--content);border:1px solid var(--border);border-radius:9px;padding:14px 16px}.method-steps{counter-reset:steps;display:grid;gap:14px}.method-steps article{counter-increment:steps;background:var(--content);border:1px solid var(--border);border-radius:10px;padding:18px 20px}.method-steps h2:before{content:counter(steps) ". ";color:var(--kelp)}.topic-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.topic-list article{background:var(--content);border:1px solid var(--border);border-radius:10px;padding:20px}.terms article{padding:18px 0;border-bottom:1px solid var(--border)}.terms article:last-child{border-bottom:0}.site-footer{background:#143038;color:#E7F4F8;border-top:1px solid var(--cyan);font-size:13px}.footer-inner{padding:34px 0 calc(82px + env(safe-area-inset-bottom))}.footer-brand{display:flex;align-items:center;gap:12px;margin-bottom:22px}.footer-brand div{display:flex;flex-direction:column}.footer-brand strong{font-size:16px}.footer-brand span{color:#BFD7DD;font-size:12px}.footer-links{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px;padding:20px 0;border-top:1px solid rgba(110,201,212,.28);border-bottom:1px solid rgba(110,201,212,.28)}.footer-links section{display:flex;flex-direction:column;gap:7px}.footer-links h2{font-size:13px;color:#E7F4F8;margin:0 0 5px}.footer-links a{color:#D9E9ED}.footer-note{max-width:760px;color:#C9DDE2;margin:18px 0 8px}.footer-copy{color:#ABC7CE;margin:0}.overlay{position:fixed;inset:0;z-index:1090;background:rgba(20,48,56,.42);opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.overlay.is-open{opacity:1;visibility:visible;pointer-events:auto}.bay-panel{position:fixed;left:0;right:0;top:0;z-index:1100;height:58vh;max-height:680px;background:var(--content);transform:translateY(-104%);visibility:hidden;pointer-events:none;transition:transform .26s ease,visibility .26s}.bay-panel.is-open{transform:translateY(0);visibility:visible;pointer-events:auto;box-shadow:0 20px 50px rgba(22,48,56,.18)}.panel-head{height:70px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border)}.panel-brand{display:flex;align-items:center;gap:10px}.close-button{appearance:none;min-height:44px;padding:0 14px;border-radius:8px;border:1px solid var(--deep);background:var(--white);color:var(--deep);cursor:pointer}.panel-grid{height:calc(58vh - 70px);max-height:610px;overflow:auto;padding-top:18px;padding-bottom:22px;display:grid;grid-template-columns:1.2fr 1.2fr .9fr 1.3fr;gap:18px}.panel-grid section{min-width:0}.panel-grid h2{font-size:14px;margin:0 0 8px;color:var(--muted)}.panel-grid a{display:block;padding:8px 0;border-bottom:1px solid var(--border)}.panel-grid b{display:block;color:var(--deep);font-size:14px}.panel-grid span{display:block;color:var(--soft);font-size:12px;line-height:1.5;margin-top:2px}.search-layer{position:fixed;left:0;right:0;top:74px;z-index:1100;visibility:hidden;pointer-events:none;opacity:0;transition:.2s}.search-layer.is-open{visibility:visible;pointer-events:auto;opacity:1}.search-card{background:var(--white);border:1px solid var(--border);border-radius:0 0 12px 12px;box-shadow:var(--shadow);padding:20px}.search-head{display:flex;align-items:center;justify-content:space-between;gap:18px}.search-head h2{margin:0}.search-card p{color:var(--muted)}.search-presets{display:flex;flex-wrap:wrap;gap:10px}.search-presets a{min-height:42px;padding:0 16px;border:1px solid var(--border-strong);border-radius:8px;display:inline-flex;align-items:center;background:var(--secondary);color:var(--deep)}.mobile-bottom{display:none}
@media (max-width:720px){.shore-nav{display:none}.site-main{padding-top:74px}.shell{width:calc(100% - 32px)}.brand-actions{gap:6px}.top-app-link,.menu-button{padding:0 10px}.page-wrap{padding-top:24px;padding-bottom:70px}.center-cards,.period-grid,.topic-list,.product-band{grid-template-columns:1fr}.status-item{grid-template-columns:1fr}.footer-links{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-inner{padding-bottom:calc(72px + env(safe-area-inset-bottom))}.mobile-bottom{position:fixed;left:0;right:0;bottom:0;z-index:1050;height:calc(48px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);display:grid;grid-template-columns:repeat(4,1fr);background:var(--white);border-top:1px solid var(--border)}.mobile-bottom a{display:flex;align-items:center;justify-content:center;min-height:48px;color:var(--muted);font-size:13px}.mobile-bottom a.is-current{background:var(--cyan);color:var(--deep);font-weight:700}.bay-panel{height:58vh}.panel-grid{grid-template-columns:1fr 1fr;height:calc(58vh - 70px)}.search-layer{top:0;bottom:0;background:var(--deep);color:var(--white);padding-top:0}.search-layer.is-open{display:block}.search-card{width:100%;height:100%;border-radius:0;border:0;background:var(--deep);color:var(--white);padding:24px 16px}.search-head h2{color:var(--white)}.search-card p{color:#CEE1E6}.search-card .close-button{border-color:var(--white)}.search-presets{display:grid;grid-template-columns:1fr 1fr}.search-presets a{background:rgba(243,250,252,.1);color:var(--white);border-color:rgba(243,250,252,.24)}.text-columns{columns:1}.slot-app{height:320px}.site-footer{margin-bottom:0}}
@media (max-width:420px){.tide-brow-inner span{max-width:70%;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.brand-fallback{font-size:15px}.top-app-link,.menu-button{font-size:13px}.panel-grid{grid-template-columns:1fr}.panel-grid section{padding-bottom:10px}.footer-links{grid-template-columns:1fr 1fr}}