:root{--bg:#F5FAFE;--deep:#E7F2FA;--paper:#FFFFFF;--soft:#D7EAF6;--title:#16324A;--text:#2A4156;--muted:#4E6A80;--sub:#6E8899;--blue:#4AA3E0;--bright:#6BB8EC;--navy:#1B4A6E;--mist:#EAF5FC;--line:rgba(74,163,224,.16);--line-strong:rgba(74,163,224,.42);--shadow:0 12px 28px rgba(27,74,110,.08);--radius:12px;--max:1120px}
*{box-sizing:border-box}html{scroll-behavior:smooth;overflow-x:hidden}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;font-size:15px;line-height:1.7;overflow-x:hidden;padding-top:122px;padding-bottom:0}a{color:inherit;text-decoration:none}button,input{font:inherit}.skip-link{position:fixed;left:12px;top:-80px;z-index:110;background:#fff;color:var(--navy);padding:8px 12px;border-radius:8px;border:1px solid var(--line-strong)}.skip-link:focus{top:8px}.thinbar{position:fixed;left:0;right:0;top:0;height:22px;background:var(--navy);color:#fff;z-index:90}.thinbar-inner,.masthead-inner,.tabs-inner,.footer-inner,.section-inner{width:min(var(--max),calc(100% - 32px));margin:0 auto}.thinbar-inner{height:22px;display:flex;align-items:center;justify-content:space-between;font-size:12px;line-height:1}.text-button{position:relative;border:0;background:transparent;color:#fff;padding:0 8px;height:22px;cursor:pointer}.text-button:before{content:"";position:absolute;inset:-11px -8px}.masthead{position:fixed;left:0;right:0;top:22px;height:60px;background:#fff;border-bottom:1px solid var(--line-strong);z-index:88}.masthead-inner{height:60px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center}.brand-link{justify-self:start;height:44px;min-width:56px;display:flex;align-items:center}.brand-logo,.drawer-logo,.footer-logo{display:block;height:28px;width:auto;max-width:160px;object-fit:contain;object-position:center}.brand-fallback{font-size:16px;font-weight:800;color:var(--navy)}.drawer-trigger,.app-link,.icon-button,.search-row button{min-height:44px;border-radius:10px;border:1px solid var(--line-strong);background:#fff;color:var(--navy);padding:0 16px;display:inline-flex;align-items:center;justify-content:center;cursor:pointer}.drawer-trigger{justify-self:center}.app-link{justify-self:end}.drawer-trigger:hover,.app-link:hover,.icon-button:hover,.search-row button:hover{border-color:var(--blue);background:var(--mist)}.tabs{position:fixed;left:0;right:0;top:82px;height:40px;background:var(--mist);border-bottom:1px solid var(--line);z-index:86}.tabs-inner{height:40px;display:flex;align-items:center;justify-content:center;gap:8px}.tabs a{height:32px;min-width:82px;padding:0 18px;border-radius:9px;display:flex;align-items:center;justify-content:center;font-size:13px;color:var(--navy)}.tabs a:hover{background:#fff}.tabs a.is-current{background:var(--blue);color:#fff}.site-main{min-height:60vh}.section{padding:34px 0}.section.alt{background:var(--deep)}.section-title{margin:0 0 8px;color:var(--title);font-size:20px;line-height:1.4}.section-kicker{margin:0 0 8px;font-size:13px;color:var(--blue);font-weight:700;letter-spacing:.06em}.lead{max-width:760px;margin:0;color:var(--muted)}.page-hero{padding:42px 0 30px}.page-hero h1,.cover-copy h1{margin:0 0 12px;color:var(--title);font-size:24px;line-height:1.3}.page-hero p{max-width:780px;margin:0;color:var(--muted)}.cover{padding:28px 0 36px}.image-slot{background:var(--mist);border:1px solid var(--line);border-radius:14px;display:flex;align-items:center;justify-content:center;overflow:hidden}.image-slot img{display:block;width:100%;height:100%;object-fit:contain;object-position:center}.banner-slot{height:260px}.feature-slot{height:180px}.wide-slot{height:200px}.app-slot{height:340px}.cover-copy{max-width:820px;margin:22px auto 0;text-align:center}.cover-copy .brand-caption{font-size:13px;color:var(--blue);font-weight:700;letter-spacing:.08em}.cover-copy p{margin:0 auto 18px;max-width:760px}.actions{display:flex;justify-content:center;gap:10px;flex-wrap:wrap}.btn{height:42px;padding:0 18px;border-radius:10px;display:inline-flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;white-space:nowrap}.btn.primary{background:linear-gradient(135deg,#6BB8EC 0%,#4AA3E0 55%,#1B4A6E 100%);color:#fff}.btn.secondary{background:#fff;border:1px solid var(--line-strong);color:var(--navy)}.btn:hover{transform:translateY(-1px);box-shadow:var(--shadow)}.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}.card h2,.card h3{color:var(--title);margin:0 0 8px}.card h2{font-size:20px}.card h3{font-size:16px}.card p{margin:0;color:var(--text)}.card .image-slot{margin-bottom:14px}.card-link{display:inline-flex;min-height:44px;align-items:center;margin-top:10px;color:var(--navy);font-weight:700}.number-list,.shelf,.timeline,.article-list,.note-list,.method-list,.index-grid,.policy-list{display:grid;gap:12px;margin-top:20px}.number-item,.shelf-item,.timeline-item,.article-item,.note-item,.method-item,.policy-item{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px}.number-item{display:grid;grid-template-columns:58px 1fr;gap:14px}.num{font-size:24px;line-height:1;color:var(--blue);font-weight:800}.number-item h3,.shelf-item h3,.timeline-item h3,.article-item h2,.note-item h3,.method-item h2,.policy-item h2{margin:0 0 6px;color:var(--title);font-size:16px}.number-item p,.shelf-item p,.timeline-item p,.article-item p,.note-item p,.method-item p,.policy-item p{margin:0}.shelf{grid-template-columns:repeat(2,1fr)}.shelf-item{border-left:4px solid var(--blue)}.timeline{position:relative;padding-left:18px}.timeline:before{content:"";position:absolute;left:5px;top:8px;bottom:8px;width:2px;background:var(--soft)}.timeline-item{position:relative}.timeline-item:before{content:"";position:absolute;left:-18px;top:22px;width:10px;height:10px;background:var(--blue);border:3px solid var(--bg);border-radius:50%}.status{display:inline-flex;align-items:center;min-height:28px;padding:0 10px;border-radius:999px;background:var(--mist);color:var(--navy);font-size:12px;font-weight:700;margin-bottom:8px}.quote-note{border-left:3px solid var(--bright);padding:12px 16px;background:var(--mist);border-radius:0 10px 10px 0;color:var(--navy)}.prose{max-width:820px}.prose p{margin:0 0 14px}.prose h2{margin:30px 0 10px;color:var(--title);font-size:20px}.prose h3{margin:22px 0 8px;color:var(--title);font-size:16px}.tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}.tag{display:inline-flex;min-height:32px;align-items:center;padding:0 10px;border-radius:999px;background:var(--mist);color:var(--navy);font-size:13px}.index-grid{grid-template-columns:repeat(4,1fr)}.index-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px}.index-card h2{font-size:16px;margin:0 0 10px;color:var(--title)}.index-card a{display:flex;min-height:40px;align-items:center;border-top:1px solid var(--line);color:var(--navy)}.index-card a:first-of-type{border-top:0}.faq-list{display:grid;gap:12px;margin-top:20px}.faq-item{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px}.faq-item h2{font-size:16px;margin:0 0 8px;color:var(--title)}.faq-item p{margin:0}.site-footer{background:var(--navy);color:#E7F2FA;border-top:1px solid rgba(234,245,252,.35);padding:30px 0 26px;margin-top:28px}.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{font-size:13px;color:#D7EAF6}.footer-logo{filter:none}.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}.footer-grid h2{font-size:13px;margin:0 0 8px;color:#fff}.footer-grid a{display:block;min-height:32px;line-height:32px;font-size:13px;color:#E7F2FA}.footer-grid a:hover{text-decoration:underline}.footer-note,.copyright{font-size:13px;color:#D7EAF6}.footer-note{border-top:1px solid rgba(234,245,252,.18);padding-top:18px;margin:20px 0 6px}.copyright{margin:0}.overlay{position:fixed;inset:0;background:rgba(22,50,74,.34);z-index:94;opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.overlay.is-active{opacity:1;visibility:visible;pointer-events:auto}.drawer{position:fixed;top:0;right:0;bottom:0;width:400px;max-width:86vw;background:#fff;z-index:98;transform:translateX(102%);visibility:hidden;pointer-events:none;transition:transform .22s ease,visibility .22s;overflow-y:auto;box-shadow:-18px 0 40px rgba(27,74,110,.12)}.drawer-open .drawer{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-head{position:sticky;top:0;z-index:2;background:#fff;border-bottom:1px solid var(--line);padding:12px 16px;display:flex;align-items:center;justify-content:space-between}.drawer-brand{display:flex;align-items:center;gap:10px}.drawer-groups{padding:6px 16px 26px}.drawer-groups section{padding:12px 0;border-bottom:1px solid var(--line)}.drawer-groups h2{font-size:13px;color:var(--muted);margin:0 0 4px}.drawer-groups a{display:grid;grid-template-columns:72px 1fr;gap:10px;padding:10px;border-radius:9px}.drawer-groups a:hover{background:var(--mist)}.drawer-groups b{font-size:14px;color:var(--title)}.drawer-groups span{font-size:12px;color:var(--muted)}.search-panel{position:fixed;left:0;right:0;top:82px;z-index:97;visibility:hidden;pointer-events:none;opacity:0;transition:.18s}.search-open .search-panel{visibility:visible;pointer-events:auto;opacity:1}.search-card{width:min(760px,calc(100% - 32px));margin:14px auto;background:#fff;border:1px solid var(--line-strong);border-radius:14px;padding:18px;box-shadow:var(--shadow)}.search-head{display:flex;justify-content:space-between;gap:20px}.search-head strong{color:var(--title)}.search-head p{margin:2px 0 0;color:var(--muted)}.search-form{margin-top:14px}.search-form label{display:block;font-size:13px;color:var(--muted);margin-bottom:6px}.search-row{display:grid;grid-template-columns:1fr auto;gap:8px}.search-row input{min-width:0;height:44px;border:1px solid var(--line-strong);border-radius:10px;padding:0 12px;color:var(--title);background:#fff}.search-presets{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}.search-presets a{display:inline-flex;align-items:center;min-height:36px;padding:0 12px;border-radius:999px;background:var(--mist);color:var(--navy);font-size:13px}.modal-lock{overflow:hidden}.mobile-bottom{display:none}.split{display:grid;grid-template-columns:1.2fr .8fr;gap:20px;align-items:start}.mini-list{display:grid;gap:10px}.mini-list a{display:block;background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px;color:var(--navy)}.app-intro{display:grid;grid-template-columns:.8fr 1.2fr;gap:22px;align-items:center}.icon-row{display:flex;align-items:center;gap:12px;margin-bottom:14px}.app-icon{width:48px;height:48px;object-fit:contain}.figure-caption{font-size:13px;color:var(--sub);margin-top:8px}.legal-callout{background:var(--mist);border:1px solid var(--line);border-radius:12px;padding:16px;color:var(--navy)}
:focus-visible{outline:3px solid rgba(74,163,224,.4);outline-offset:2px}
@media(max-width:820px){body{padding-top:82px;padding-bottom:calc(58px + env(safe-area-inset-bottom))}.tabs{display:none}.thinbar-inner,.masthead-inner,.footer-inner,.section-inner{width:calc(100% - 32px)}.masthead-inner{grid-template-columns:auto 1fr auto;gap:8px}.drawer-trigger{justify-self:center}.brand-link{min-width:44px}.app-link,.drawer-trigger{padding:0 12px}.section{padding:26px 0}.page-hero{padding:30px 0 20px}.grid-3,.grid-2,.shelf,.index-grid,.split,.app-intro{grid-template-columns:1fr}.banner-slot{height:220px}.feature-slot{height:170px}.wide-slot{height:190px}.app-slot{height:320px}.cover-copy{text-align:left}.actions{justify-content:flex-start}.footer-grid{grid-template-columns:repeat(2,1fr)}.drawer{width:86vw;max-width:86vw}.search-panel{top:0;bottom:0;background:var(--navy)}.search-card{width:100%;height:100%;margin:0;border:0;border-radius:0;background:var(--navy);color:#fff;padding:calc(24px + env(safe-area-inset-top)) 16px 20px}.search-head strong,.search-head p,.search-form label{color:#fff}.search-row{grid-template-columns:1fr}.search-row button{background:#fff}.search-presets a{background:#fff;color:var(--navy)}.search-head .icon-button{border-color:rgba(255,255,255,.5);background:transparent;color:#fff}.mobile-bottom{position:fixed;display:grid;grid-template-columns:repeat(5,1fr);left:0;right:0;bottom:0;height:calc(48px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:#fff;border-top:1px solid var(--line-strong);z-index:89}.mobile-bottom a{display:flex;align-items:center;justify-content:center;font-size:13px;color:var(--navy)}.mobile-bottom a.is-current{background:var(--blue);color:#fff}.drawer-open .mobile-bottom,.search-open .mobile-bottom{z-index:80}.number-item{grid-template-columns:44px 1fr}.footer-note{margin-bottom:10px}}
@media(max-width:480px){.banner-slot{height:190px}.feature-slot{height:160px}.wide-slot{height:170px}.app-slot{height:290px}.footer-grid{grid-template-columns:1fr 1fr}.drawer-groups a{grid-template-columns:64px 1fr}.page-hero h1,.cover-copy h1{font-size:24px}}