:root{--bg:#F3F7FB;--deep:#E6EFF7;--surface:#fff;--sub:#DCEBF5;--ink:#10263A;--text:#263B4C;--muted:#60788C;--soft:#8094A5;--brand:#3B9FE0;--light:#67B9EC;--steel:#1E6FB8;--ice:#B8DDF3;--mint:#39A69C;--line:rgba(30,111,184,.16);--strong:rgba(59,159,224,.38);--shadow:0 14px 36px rgba(16,38,58,.08);--max:1240px}
*{box-sizing:border-box}html{scroll-behavior:smooth;overflow-x:hidden}body{margin:0;overflow-x:hidden;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;font-size:16px;line-height:1.82}body.layer-open{overflow:hidden}img{display:block;max-width:100%;height:auto}a{color:var(--steel);text-underline-offset:3px}a:hover{color:#145f9d}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid rgba(59,159,224,.42);outline-offset:3px}button,input{font:inherit}button{cursor:pointer}.skip-link{position:fixed;left:16px;top:-70px;z-index:120;background:var(--ink);color:#fff;padding:10px 14px;border-radius:8px}.skip-link:focus{top:12px}
.brand-bar{position:sticky;top:0;z-index:80;height:72px;background:rgba(255,255,255,.93);backdrop-filter:blur(14px);border-bottom:1px solid var(--line);box-shadow:0 8px 24px rgba(16,38,58,.05)}.brand-bar__inner{width:min(var(--max),calc(100% - 32px));height:100%;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:18px}.brand-home{min-width:0;display:flex;align-items:center;gap:14px;text-decoration:none;color:var(--ink)}.brand-home img,.footer-logo-link img,.panel-brand img{max-height:34px;width:auto;object-fit:contain}.brand-wordmark,.footer-wordmark{font-size:22px;font-weight:900;color:var(--ink)}.brand-status{font-size:14px;color:var(--muted);white-space:nowrap}.brand-actions{display:flex;gap:8px;align-items:center}.icon-button,.top-app-link,.rail-all,.close-button{min-height:44px;padding:0 15px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--steel);font-weight:800;text-decoration:none;display:inline-flex;align-items:center;justify-content:center}.icon-button:hover,.top-app-link:hover,.rail-all:hover,.close-button:hover{border-color:var(--strong);background:#eef7fd}.menu-button{border-color:transparent;color:#fff;background:linear-gradient(135deg,#67B9EC 0%,#3B9FE0 52%,#1E6FB8 100%)}.menu-button:hover{color:#fff;filter:brightness(.98)}
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.page-section{margin:32px 0;padding:28px;border:1px solid var(--line);border-radius:14px;background:var(--surface);box-shadow:var(--shadow)}.page-section.soft{background:linear-gradient(145deg,#fff,#eef7fd)}.section-heading{margin-bottom:18px}.two-col,.three-col,.four-col,.task-grid,.related-grid,.term-grid,.feedback-grid,.help-categories,.workbench,.collection-layout,.mobile-product{display:grid;gap:18px}.two-col,.term-grid,.feedback-grid,.help-categories,.workbench{grid-template-columns:repeat(2,minmax(0,1fr))}.three-col,.related-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.four-col,.task-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.collection-layout{grid-template-columns:1.1fr .9fr}.mobile-product{grid-template-columns:minmax(260px,.8fr) minmax(0,1.2fr);align-items:center}.task-card,.mini-card,.term-card,.short-read,.tool-card,.chapter-card,.feedback-card,.help-card{padding:20px;border:1px solid var(--line);border-radius:12px;background:#fff}.task-card .num,.topic-tile .num,.rank-item .num{color:var(--steel);font-size:28px;font-weight:900;line-height:1}.editorial-grid{display:grid;grid-template-columns:1.3fr .7fr;gap:18px}.editorial-main{padding:24px;border:1px solid var(--line);border-radius:14px;background:#fff}.editorial-side{display:grid;gap:18px}.channel-band{display:grid;grid-template-columns:minmax(260px,.9fr) minmax(0,1.1fr);gap:24px;align-items:center;margin:22px 0;padding:22px;border:1px solid var(--line);border-radius:14px;background:#fff}.channel-band:nth-child(even) .channel-copy{order:-1}.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0}.tag{padding:6px 10px;border-radius:8px;background:var(--deep);color:var(--ink);font-size:13px}.timeline-nodes{display:grid;gap:14px}.timeline-node{display:grid;grid-template-columns:44px 1fr;gap:14px}.timeline-node>span{width:34px;height:34px;display:grid;place-items:center;border-radius:50%;background:var(--steel);color:#fff;font-weight:900}
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.faq-list details{margin-bottom:12px;border:1px solid var(--line);border-radius:12px;background:#fff;overflow:hidden}.faq-list summary{min-height:52px;padding:14px 18px;display:flex;align-items:center;cursor:pointer;color:var(--ink);font-weight:900}.faq-list details p{padding:0 18px 18px;margin:0}.principles{display:grid;gap:22px;counter-reset:principle}.principle{counter-increment:principle;display:grid;grid-template-columns:70px 1fr;gap:20px;padding:24px;border:1px solid var(--line);border-radius:13px;background:#fff}.principle:before{content:counter(principle,decimal-leading-zero);font-size:30px;font-weight:900;color:var(--steel)}.related-block{margin:44px 0 28px}.related-card{min-height:140px;padding:20px;border:1px solid var(--line);border-radius:13px;background:#fff;text-decoration:none;color:var(--text)}.related-card strong{display:block;margin-bottom:8px;color:var(--ink);font-size:18px}.related-card span{display:block;color:var(--muted)}.action-band{margin-top:34px;padding:28px;display:flex;align-items:center;justify-content:space-between;gap:24px;border:1px solid var(--line);border-radius:14px;background:linear-gradient(135deg,#dcebf5,#eef7fb)}.action-band p{margin-bottom:0;max-width:720px}
.site-footer{padding:52px 0 28px;background:var(--ink);color:#c7d8e6}.footer-inner{width:min(var(--max),calc(100% - 32px));margin:auto}.footer-brand{display:flex;align-items:center;gap:14px;margin-bottom:28px}.footer-brand strong{display:block;color:#fff;font-size:20px}.footer-brand span{display:block;color:#9fc1da;font-size:13px}.footer-wordmark{color:#fff}.footer-nav{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:28px}.footer-nav h2{color:#fff;font-size:15px}.footer-nav a{display:block;min-height:34px;color:#c7d8e6;text-decoration:none;font-size:14px}.footer-note{margin-top:28px;padding-top:22px;border-top:1px solid rgba(255,255,255,.12);color:#a9c4d8}.copyright{color:#8fb0c8;font-size:14px}
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@media(max-width:760px){body{padding-bottom:calc(58px + env(safe-area-inset-bottom))}.brand-bar{height:68px}.brand-bar__inner{width:calc(100% - 24px);gap:10px}.brand-status,.top-app-link{display:none}.brand-actions{gap:6px}.icon-button{padding:0 12px}.layout-shell,.footer-inner{width:calc(100% - 32px)}.layout-shell{padding:24px 0 46px}.page-section{padding:20px;margin:26px 0}.two-col,.three-col,.four-col,.task-grid,.related-grid,.term-grid,.feedback-grid,.help-categories,.workbench,.clip-directory{grid-template-columns:1fr}.editorial-grid,.profile-index{grid-template-columns:1fr}.channel-band,.channel-band:nth-child(even){grid-template-columns:1fr}.channel-band:nth-child(even) .channel-copy{order:initial}.channel-band figure,.channel-band .media-fallback{order:-1}.topic-mosaic{grid-template-columns:1fr}.topic-tile:nth-child(n){grid-column:span 1;min-height:150px}.film-row,.shelf-layer{grid-template-columns:1fr}.clip-entry{grid-template-columns:1fr}.process-flow,.kanban,.topic-map{grid-template-columns:1fr}.magazine-grid{grid-template-columns:1fr}.magazine-block:nth-child(n){grid-column:span 1}.action-band{align-items:flex-start;flex-direction:column}.panel-groups{grid-template-columns:1fr}.site-panel{width:100%;padding:20px 16px calc(20px + env(safe-area-inset-bottom))}.search-results{grid-template-columns:1fr}.mobile-bottom-nav{position:fixed;left:0;right:0;bottom:0;z-index:70;display:grid;grid-template-columns:repeat(5,1fr);min-height:58px;padding-bottom:env(safe-area-inset-bottom);border-top:1px solid var(--line);background:rgba(255,255,255,.97);box-shadow:0 -8px 24px rgba(16,38,58,.07)}.mobile-bottom-nav a{min-width:0;min-height:58px;display:grid;place-items:center;text-decoration:none;color:var(--muted);font-size:13px;font-weight:900;white-space:nowrap}.mobile-bottom-nav a.is-current{background:var(--steel);color:#fff}.media-frame,.media-frame-wide,.brand-banner,.media-frame-portrait{min-height:0;max-height:none}.media-frame img,.media-frame-wide img,.brand-banner img,.media-frame-portrait img{height:auto}}
@media(max-width:420px){.brand-wordmark{font-size:19px}.brand-actions .icon-button{padding:0 10px;font-size:14px}.footer-nav{grid-template-columns:1fr 1fr;gap:20px}.step-item{padding-left:62px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}