:root {
  --bg:#F5FAFE; --deep:#E7F2FA; --card:#FFFFFF; --secondary:#D7EAF6;
  --title:#16324A; --text:#2A4156; --muted:#4E6A80; --soft:#6E8899;
  --brand:#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;
  --top:22px; --mast:60px; --tabs:40px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--bg);overflow-x:hidden}
body{margin:0;color:var(--text);background:var(--bg);font:15px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;overflow-x:hidden}
a{color:inherit;text-decoration:none} button,input{font:inherit} img{display:block;max-width:100%}
button,a{outline-offset:3px} :focus-visible{outline:3px solid rgba(74,163,224,.45)}
.skip-link{position:fixed;left:16px;top:-70px;z-index:1000;background:#fff;color:var(--navy);padding:10px 14px;border-radius:8px;box-shadow:var(--shadow)}
.skip-link:focus{top:8px}
.topline{position:fixed;inset:0 0 auto 0;height:var(--top);z-index:120;background:var(--navy);color:#fff}
.topline-inner,.masthead-inner{max-width:var(--max);height:100%;margin:auto;padding:0 16px;display:flex;align-items:center;justify-content:space-between}
.topline-inner{font-size:12px;letter-spacing:.03em}.text-button{min-height:22px;border:0;background:transparent;color:#fff;padding:0 6px;cursor:pointer}
.masthead{position:fixed;top:var(--top);left:0;right:0;height:var(--mast);z-index:115;background:#fff;border-bottom:1px solid var(--line)}
.masthead-inner{display:grid;grid-template-columns:1fr auto 1fr;gap:14px}.brand-mark{justify-self:start;min-width:44px;min-height:44px;display:flex;align-items:center;font-size:22px;font-weight:800;color:var(--navy)}
.brand-mark img,.drawer-title img,.footer-logo img{height:28px;width:auto;max-width:132px;object-fit:contain;object-position:center}
.drawer-trigger,.app-link{height:44px;display:inline-flex;align-items:center;justify-content:center;border-radius:10px;font-size:14px;font-weight:700;white-space:nowrap}
.drawer-trigger{justify-self:center;border:1px solid var(--line-strong);background:var(--mist);color:var(--navy);padding:0 20px;cursor:pointer}
.app-link{justify-self:end;padding:0 16px;color:#fff;background:linear-gradient(135deg,#6BB8EC 0%,#4AA3E0 55%,#1B4A6E 100%)}
.tabbar{position:fixed;top:calc(var(--top) + var(--mast));left:0;right:0;height:var(--tabs);z-index:110;background:var(--mist);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:center;gap:10px}
.tabbar a{min-width:84px;height:32px;padding:0 15px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:13px;color:var(--navy)}
.tabbar a:hover,.tabbar a.is-current{background:var(--brand);color:#fff}
.site-main{padding-top:calc(var(--top) + var(--mast) + var(--tabs) + 28px);padding-bottom:40px;min-height:70vh}
.content-wrap{width:min(calc(100% - 32px),var(--max));margin-left:auto;margin-right:auto}.section-block{margin-top:44px}.page-hero{padding:24px 0 8px}.page-hero h1,.cover-copy h1{margin:4px 0 14px;color:var(--title);font-size:24px;line-height:1.3;letter-spacing:-.02em}.page-hero .lead,.cover-copy>p:not(.eyebrow){max-width:820px;color:var(--text);margin:0;font-size:15px;line-height:1.8}.eyebrow{margin:0 0 7px;color:var(--brand);font-size:12px;font-weight:800;letter-spacing:.12em;text-transform:uppercase}.section-heading{max-width:780px;margin-bottom:18px}.section-heading h2,.feature-copy h2,.info-card h2,.callout h2{margin:4px 0 10px;color:var(--title);font-size:20px;line-height:1.35}.section-heading p:last-child{margin:0;color:var(--muted)}
h2{font-size:20px;line-height:1.4;color:var(--title)} h3{font-size:16px;line-height:1.45;color:var(--title)} p{margin:0 0 14px}
.cover-section{padding-top:2px}.cover-slot{width:100%;height:260px;background:var(--mist);border:1px solid var(--line);border-radius:14px}.cover-slot img{width:100%;height:100%;object-fit:contain;object-position:center}.cover-copy{padding:20px 0 0;max-width:850px}
.button-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}.button{height:42px;min-width:112px;padding:0 18px;border-radius:10px;display:inline-flex;align-items:center;justify-content:center;font-size:14px;font-weight:800;white-space:nowrap}.button.primary{color:#fff;background:linear-gradient(135deg,#6BB8EC 0%,#4AA3E0 55%,#1B4A6E 100%);box-shadow:0 9px 20px rgba(27,74,110,.12)}.button.secondary{background:#fff;border:1px solid var(--line-strong);color:var(--navy)}.button:hover{transform:translateY(-1px)}
.card-grid{display:grid;gap:16px}.card-grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}.card-grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.card,.info-card,.help-grid article,.contact-grid article{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px;box-shadow:var(--shadow)}.card h2,.card h3{margin:8px 0}.card p{color:var(--muted)}.card-media{height:180px;margin:-18px -18px 16px;border-radius:12px 12px 0 0}.media-slot{display:flex;align-items:center;justify-content:center;background:var(--mist);overflow:hidden}.media-slot img{width:100%;height:100%;object-fit:contain;object-position:center}.card-kicker{display:inline-block;color:var(--brand);font-size:12px;font-weight:800}.text-link{display:inline-flex;min-height:44px;align-items:center;color:var(--navy);font-weight:800}.text-link:hover{text-decoration:underline;text-underline-offset:4px}
.feature-split{display:grid;grid-template-columns:minmax(0,.95fr) minmax(0,1.05fr);gap:28px;align-items:center}.feature-split.reverse>div:first-child{order:2}.feature-media{height:200px;border:1px solid var(--line);border-radius:12px}.feature-copy{min-width:0}.number-list p{display:grid;grid-template-columns:44px 60px 1fr;gap:8px;align-items:start;padding:10px 0;border-bottom:1px solid var(--line);margin:0}.number-list span,.big-number-list>li>span,.method-list article>span,.shelf-large article>span{color:var(--brand);font-weight:900;letter-spacing:.04em}
.shelf-list{display:grid;gap:10px}.shelf-list a{display:grid;grid-template-columns:170px 1fr;gap:18px;align-items:center;min-height:64px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 16px}.shelf-list span{font-weight:800;color:var(--title)}.shelf-list small{font-size:13px;color:var(--muted)}.shelf-list a:hover{border-color:var(--line-strong);box-shadow:var(--shadow)}
.big-number-list{list-style:none;padding:0;margin:0;display:grid;gap:10px}.big-number-list li{display:grid;grid-template-columns:48px 1fr;gap:10px;padding:12px 0;border-bottom:1px solid var(--line)}.big-number-list li>span{font-size:22px}.big-number-list strong{color:var(--title)}.big-number-list p{margin:2px 0 0;color:var(--muted)}
.timeline{position:relative;padding-left:28px;display:grid;gap:2px}.timeline:before{content:"";position:absolute;left:7px;top:9px;bottom:10px;width:2px;background:var(--secondary)}.timeline>div{position:relative;padding:0 0 18px}.timeline>div>span{position:absolute;left:-26px;top:7px;width:14px;height:14px;border-radius:50%;background:var(--brand);border:3px solid #fff;box-shadow:0 0 0 2px var(--brand)}.timeline strong{color:var(--title)}.timeline p{margin:4px 0 0;color:var(--muted)}.timeline.compact{margin:12px 0 4px}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}.tag-row span{background:var(--mist);border:1px solid var(--line);color:var(--navy);padding:6px 10px;border-radius:999px;font-size:13px}
.app-band{background:var(--deep);border:1px solid var(--line);border-radius:14px;padding:22px;display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);gap:28px;align-items:center}.app-media{height:340px;background:#fff;border-radius:12px}.icon-slot{width:48px;height:48px;background:#fff;border:1px solid var(--line);border-radius:12px}.app-icon{margin-bottom:10px}.app-copy h2{margin:4px 0 10px}.app-copy p{color:var(--text)}
.info-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.info-card p{color:var(--muted)}
.faq-preview .accordion-static,.faq-list{display:grid;gap:10px}.accordion-static details,.faq-list details{background:#fff;border:1px solid var(--line);border-radius:10px;padding:0 16px}.accordion-static summary,.faq-list summary{cursor:pointer;min-height:52px;display:flex;align-items:center;font-weight:800;color:var(--title)}.accordion-static details p,.faq-list details p{padding:0 0 14px;margin:0;color:var(--muted)}
.number-cards{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.number-cards article{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px}.number-cards span{display:inline-block;color:var(--brand);font-size:22px;font-weight:900}.number-cards h2{margin:5px 0}.number-cards p{color:var(--muted)}.number-cards a{min-height:44px;display:inline-flex;align-items:center;color:var(--navy);font-weight:800}
.prose{max-width:880px}.prose h2{margin:26px 0 8px}.prose p{color:var(--text);line-height:1.85}.prose .button-row{margin-top:22px}
.steps{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.steps article{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px}.steps span{color:var(--brand);font-weight:900}.steps h2{margin:4px 0 8px}.steps p{color:var(--muted)}
.visual-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.visual-grid article{background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden}.visual-grid article>h2,.visual-grid article>p{margin-left:18px;margin-right:18px}.visual-grid article>h2{margin-top:14px;margin-bottom:8px}.visual-grid article>p{color:var(--muted);margin-bottom:18px}.visual-media{height:220px}.shelf-large{display:grid;gap:12px}.shelf-media{height:220px;border:1px solid var(--line);border-radius:12px}.shelf-large article{display:grid;grid-template-columns:54px 1fr;gap:14px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px}.shelf-large article>span{font-size:24px}.shelf-large h2{margin:0 0 6px}.shelf-large p{color:var(--muted)}.shelf-large a{display:inline-flex;min-height:44px;align-items:center;color:var(--navy);font-weight:800}
.notes-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.notes-grid article{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px}.notes-grid article:first-child{grid-column:1/-1}.notes-grid h2{margin:8px 0}.notes-grid p{color:var(--muted)}
.method-list{display:grid;gap:14px}.method-list article{display:grid;grid-template-columns:58px 1fr;gap:14px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px}.method-list article>span{font-size:24px}.method-list h2{margin:0 0 8px}.method-list p{color:var(--muted)}.callout{background:var(--mist);border:1px solid var(--line-strong);border-radius:12px;padding:20px}.callout p{margin:0;color:var(--text)}
.directory-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.directory-grid section{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px}.directory-grid h2{margin-top:0}.directory-grid a{display:block;padding:11px 0;border-top:1px solid var(--line)}.directory-grid a:first-of-type{border-top:0}.directory-grid strong,.directory-grid span{display:block}.directory-grid span{color:var(--muted);font-size:13px;margin-top:2px}
.stack-list{display:grid;gap:10px}.stack-list>div{background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px}.stack-list p{margin:3px 0 0;color:var(--muted)}.policy-list{display:grid;gap:14px}.policy-list article{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px}.policy-list h2{margin:0 0 8px}.policy-list p:last-child{margin-bottom:0}.help-grid,.contact-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.help-grid h2,.contact-grid h2{margin-top:0}.help-grid p,.contact-grid p{color:var(--muted)}.help-grid a{display:inline-flex;min-height:44px;align-items:center;color:var(--navy);font-weight:800}
.site-footer{background:var(--navy);color:#E7F2FA;border-top:1px solid rgba(234,245,252,.28);padding:34px 0 calc(30px + env(safe-area-inset-bottom))}.footer-inner{width:min(calc(100% - 32px),var(--max));margin:auto}.footer-brand{display:flex;gap:14px;align-items:center;padding-bottom:18px;border-bottom:1px solid rgba(234,245,252,.18)}.footer-brand>div:last-child{display:grid}.footer-brand span{font-size:12px;color:#D7EAF6}.footer-links{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px;padding:22px 0}.footer-links h2{margin:0 0 8px;color:#fff;font-size:13px}.footer-links a{display:block;min-height:32px;color:#E7F2FA;font-size:13px}.footer-links a:hover{text-decoration:underline}.footer-note,.copyright{font-size:13px;color:#D7EAF6}.footer-note{max-width:760px;margin-top:6px}.copyright{margin-bottom:0}
.screen-overlay{position:fixed;inset:0;z-index:200;background:rgba(22,50,74,.36);opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.screen-overlay.is-open{opacity:1;visibility:visible;pointer-events:auto}.issue-drawer{position:fixed;right:0;top:0;bottom:0;z-index:220;width:min(400px,86vw);background:#fff;box-shadow:-20px 0 50px rgba(22,50,74,.16);transform:translateX(102%);visibility:hidden;pointer-events:none;transition:transform .24s ease,visibility .24s}.issue-drawer.is-open{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-head{height:70px;display:flex;align-items:center;justify-content:space-between;padding:0 16px;border-bottom:1px solid var(--line)}.drawer-title{display:flex;align-items:center;gap:10px;color:var(--title)}.close-button{min-width:58px;min-height:44px;border:1px solid var(--line-strong);background:#fff;color:var(--navy);border-radius:10px;cursor:pointer}.drawer-scroll{height:calc(100vh - 70px);overflow:auto;padding:14px 16px 28px}.drawer-group{padding:8px 0 16px}.drawer-group h2{font-size:13px;margin:0 0 6px;color:var(--soft)}.drawer-group a{display:grid;gap:2px;padding:10px 8px;border-radius:9px}.drawer-group a:hover{background:var(--mist)}.drawer-group strong{color:var(--title)}.drawer-group span{font-size:12px;color:var(--muted)}
.search-panel{position:fixed;left:0;right:0;top:calc(var(--top) + var(--mast));z-index:215;visibility:hidden;opacity:0;pointer-events:none;transform:translateY(-10px);transition:.2s}.search-panel.is-open{visibility:visible;opacity:1;pointer-events:auto;transform:translateY(0)}.search-card{width:min(calc(100% - 32px),760px);margin:12px auto 0;background:#fff;border:1px solid var(--line-strong);border-radius:14px;box-shadow:var(--shadow);padding:16px}.search-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}.search-head strong{color:var(--title)}.search-card label{display:block;color:var(--muted);margin-bottom:6px}.search-card input{width:100%;height:44px;border:1px solid var(--line-strong);border-radius:10px;padding:0 12px;color:var(--title);background:#fff}.search-presets{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin-top:12px}.search-presets a{min-height:44px;border-radius:10px;background:var(--mist);color:var(--navy);display:flex;align-items:center;justify-content:center;font-weight:700}.search-empty{margin:12px 0 0;color:var(--muted)}.is-locked{overflow:hidden}
.mobile-bottom{display:none}
@media (max-width:800px){
  :root{--tabs:0px}.tabbar{display:none}.site-main{padding-top:calc(var(--top) + var(--mast) + 22px);padding-bottom:calc(76px + env(safe-area-inset-bottom))}.masthead-inner{gap:8px}.brand-mark{max-width:90px}.drawer-trigger{padding:0 14px}.app-link{padding:0 12px}.card-grid.three,.card-grid.two,.info-grid,.help-grid,.contact-grid,.visual-grid,.directory-grid,.steps,.notes-grid{grid-template-columns:1fr}.notes-grid article:first-child{grid-column:auto}.feature-split,.app-band{grid-template-columns:1fr;gap:18px}.feature-split.reverse>div:first-child{order:0}.cover-slot{height:220px}.feature-media{height:190px}.app-media{height:330px}.number-cards{grid-template-columns:1fr 1fr}.shelf-list a{grid-template-columns:1fr;gap:2px}.footer-links{grid-template-columns:1fr 1fr}.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(20px + env(safe-area-inset-top)) 16px 24px}.search-head strong,.search-card label{color:#fff}.search-card input{background:#fff}.search-presets{grid-template-columns:1fr 1fr}.search-presets a{background:#fff;color:var(--navy)}.search-empty{color:#E7F2FA}.mobile-bottom{position:fixed;left:0;right:0;bottom:0;z-index:150;height:calc(48px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);display:grid;grid-template-columns:repeat(5,1fr);background:#fff;border-top:1px solid var(--line);box-shadow:0 -8px 24px rgba(27,74,110,.08)}.mobile-bottom a{min-width:0;height:48px;display:flex;align-items:center;justify-content:center;font-size:12px;color:var(--navy)}.mobile-bottom a.is-current{background:var(--brand);color:#fff}.issue-drawer{bottom:0}.screen-overlay{z-index:200}.issue-drawer,.search-panel{z-index:220}.mobile-bottom{z-index:150}
}
@media (max-width:520px){
  .content-wrap{width:calc(100% - 32px)}.section-block{margin-top:34px}.cover-slot{height:200px}.number-cards{grid-template-columns:1fr}.footer-links{grid-template-columns:1fr 1fr}.number-list p{grid-template-columns:38px 52px 1fr}.method-list article,.shelf-large article{grid-template-columns:46px 1fr}.app-band{padding:16px}.page-hero{padding-top:14px}
}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}