:root{--orange:#FF5500;--orange-ink:#A8390A;--blue:#155CC3;--ink:#182230;--muted:#475467;--line:#D5DFEB;--ease:cubic-bezier(.4,0,.2,1);--orange-hover:#FF6724;--orange-tint-rgb:255,85,0;--blue-ink:#104A9F;--blue-rgb:21,92,195;--canvas-warm:#F7F9FC;--canvas-cool:#F2F6FA;--surface-warm:#FCFDFF;--surface-cool:#F3F6FA;--surface-warm-rgb:252,253,255;--surface-cool-rgb:243,246,250;--heading-emphasis:#182230;--control-line:#7C8DA5;--shadow:0 8px 24px -18px rgba(24,34,48,.18)}
    *,*::before,*::after{box-sizing:border-box}
    html{scroll-behavior:smooth;scroll-padding-top:94px}
    body{margin:0;padding-top:70px;color:var(--ink);font-family:system-ui,-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-size:14px;line-height:1.7;background:var(--canvas-warm);overflow-wrap:anywhere}
    a{color:inherit;text-decoration:none}button,input{font:inherit;color:inherit}button{cursor:pointer}button,a,input{-webkit-tap-highlight-color:transparent}
    button{border:0}h2,h3,h4,p,ul{margin:0}ul{padding:0;list-style:none}svg{display:block;flex-shrink:0;aspect-ratio:1}
    [hidden]{display:none!important}:focus-visible{outline:3px solid var(--blue);outline-offset:5px;border-radius:5px}::selection{background:rgba(var(--orange-tint-rgb),0.1300);color:var(--ink)}
    .container{width:min(1200px,calc(100% - 64px));margin-inline:auto}.svg-library{position:absolute;width:0;height:0;overflow:hidden}
    .skip-link{position:fixed;z-index:100;top:10px;left:16px;padding:10px 18px;background:#EDF3FD;transform:translateY(-160%)}.skip-link:focus{transform:none}
    .site-header{position:fixed;inset:0 0 auto;z-index:30;height:70px;border-bottom:1px solid var(--line);background:var(--surface-warm);backdrop-filter:none;-webkit-backdrop-filter:none;}
    .header-inner{height:70px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand-logo{display:inline-flex;align-items:center;gap:10px;min-height:44px;font-size:22px;font-weight:800;letter-spacing:-.8px;white-space:nowrap}.brand-logo svg{width:40px;height:40px}
    .main-navigation{display:flex;align-items:center;gap:32px;height:100%;font-size:14px;font-weight:650}.main-navigation a{position:relative;display:flex;align-items:center;min-height:44px}.main-navigation [aria-current="page"]{color:var(--orange-ink)}.main-navigation [aria-current="page"]::after{content:"";position:absolute;bottom:0;left:calc(50% - 9px);width:18px;height:3px;border-radius:3px;background:var(--orange)}
    .main-navigation a:hover,.footer-links-grid a:hover,.brand-logo:hover{color:var(--orange-ink)}.menu-toggle{display:none;place-items:center;width:44px;height:44px;border-radius:12px;background:rgba(var(--orange-tint-rgb),0.0520)}
    .help-section{position:relative;isolation:isolate;padding:30px 0 76px;overflow:hidden}.help-section::before{content:"";position:absolute;z-index:-1;pointer-events:none;inset:0;background:none;}
    .breadcrumb{display:flex;align-items:center;gap:10px;min-height:44px;color:var(--muted);font-size:12px}.breadcrumb a{display:inline-flex;align-items:center;min-height:44px}.breadcrumb a:hover{color:var(--orange-ink)}.breadcrumb svg{width:12px;height:12px;color:var(--orange)}
    .help-intro{text-align:center;margin:28px auto 0}.eyebrow{display:inline-flex;align-items:center;gap:9px;color:var(--orange-ink);font-size:11px;font-weight:750;letter-spacing:2px}.eyebrow::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--orange);box-shadow:0 0 0 5px rgba(var(--orange-tint-rgb),0.0455)}
    .section-title{margin:14px 0 18px;font-size:clamp(32px,4.4vw,49px);line-height:1.3;font-weight:850;letter-spacing:-1.8px}.section-title span{color:var(--heading-emphasis)}.section-subtitle{max-width:39em;margin:auto;font-size:15px;line-height:1.9}.intro-detail{margin-top:9px;font-size:12px;color:var(--muted)}
    .help-hero-search{width:100%;max-width:none;min-height:188px;margin:29px auto 22px;padding:21px 24px 18px;border:1px solid rgba(var(--orange-tint-rgb),0.1235);border-radius:22px;background:var(--surface-cool);box-shadow:none;border-color:var(--line);}
    .search-label{display:block;margin-bottom:9px;font-size:12px;font-weight:700}.search-form{display:flex;align-items:center;gap:11px;min-height:60px;padding:6px 7px 6px 17px;border:1px solid rgba(var(--orange-tint-rgb),0.2080);border-radius:14px;background:var(--surface-warm);box-shadow:none;transition:border-color .3s,box-shadow .3s;border-color:var(--control-line);}.search-form:focus-within{border-color:var(--blue);box-shadow:0 0 0 3px rgba(var(--blue-rgb),.15);}
    .search-form>svg{width:21px;height:21px;color:var(--orange)}.search-form input{flex:1;min-width:0;height:46px;padding:8px 0;border:0;outline:0;background:transparent;font-size:14px;appearance:none}.search-form input:focus-visible{outline:none}.search-form input::placeholder{color:var(--muted)}.search-form input::-webkit-search-cancel-button{appearance:none}
    .clear-search{display:grid;place-items:center;flex:none;visibility:hidden;width:36px;height:40px;border-radius:9px;background:rgba(var(--orange-tint-rgb),0.0423)}.clear-search.has-query{visibility:visible}.clear-search:hover{background:rgba(var(--orange-tint-rgb),0.0975)}.search-submit{flex:none;min-width:78px;height:46px;padding:8px 17px;border-radius:10px;background:var(--orange);color:var(--ink);font-size:14px;font-weight:800;box-shadow:0 5px 15px rgba(var(--orange-tint-rgb),0.1170)}.search-submit:hover{background:var(--orange-hover)}
    .search-hints{display:flex;align-items:center;flex-wrap:wrap;gap:2px 12px;min-height:38px;margin-top:8px;color:var(--muted);font-size:11px}.search-hints button{min-height:36px;padding:2px 0;background:transparent;font-size:11px;text-decoration:underline;text-decoration-color:rgba(var(--orange-tint-rgb),0.1950);text-underline-offset:4px}.search-hints button:hover{color:var(--orange-ink)}
    .category-shortcuts{display:flex;justify-content:center;flex-wrap:wrap;gap:10px;margin:25px 0 36px}.category-shortcuts a{display:inline-flex;align-items:center;gap:9px;min-height:44px;padding:9px 16px;border:1px solid rgba(var(--orange-tint-rgb),0.1170);border-radius:99px;background:rgba(var(--orange-tint-rgb),0.0292);font-size:12px;font-weight:600}.category-shortcuts svg{color:var(--orange)}.category-shortcuts a:hover{color:var(--orange-ink);border-color:var(--orange);background:rgba(var(--orange-tint-rgb),0.0520)}
    .list-toolbar{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:6px 20px;min-height:49px;margin-bottom:14px;border-bottom:1px solid var(--line);color:var(--muted);font-size:11px}.list-toolbar strong{color:var(--orange-ink);font-size:12px}.search-status{min-width:13em;min-height:24px}
    .category-container{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));align-items:start;gap:24px;min-height:100px}.category-column{min-width:0;scroll-margin-top:96px}.category-heading{display:flex;align-items:center;justify-content:space-between;gap:8px;min-height:64px;margin-bottom:14px;padding:7px 0}.category-heading h3{position:relative;padding-left:15px;font-size:19px;line-height:1.5;font-weight:800;letter-spacing:-.5px}.category-heading h3::before{content:"";position:absolute;inset:4px auto 4px 0;width:4px;border-radius:99px;background:var(--orange);box-shadow:0 0 13px rgba(var(--orange-tint-rgb),0.1300)}.category-count{display:grid;place-items:center;flex:none;width:30px;height:30px;border:1px solid rgba(var(--orange-tint-rgb),0.1300);border-radius:10px;background:rgba(var(--orange-tint-rgb),0.0520);color:var(--orange-ink);font-size:12px;font-weight:800;font-variant-numeric:tabular-nums}
    .article-list{display:grid;gap:17px}.article-list>li{min-width:0}.article-card{display:flex;flex-direction:column;position:relative;min-height:344px;height:100%;padding:23px;border:1px solid var(--line);border-radius:19px;background:var(--surface-warm);box-shadow:var(--shadow);transition:all .3s var(--ease)}
    .category-column:nth-child(2) .article-card{border-color:rgba(var(--blue-rgb),0.1050);background:var(--surface-warm);border:1px solid var(--line);box-shadow:var(--shadow);}.article-card:hover,.article-card:focus-within{transform:translateY(-4px);border-color:rgba(var(--orange-tint-rgb),0.3250);box-shadow:0 17px 34px -20px rgba(var(--orange-tint-rgb),0.1625),0 12px 32px -24px rgba(var(--blue-rgb),0.1540)}.category-column:nth-child(2) .article-card:hover{border-color:rgba(var(--blue-rgb),0.2450);box-shadow:0 17px 34px -20px rgba(var(--blue-rgb),0.1470),0 12px 32px -24px rgba(var(--orange-tint-rgb),0.1300)}
    .article-meta{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:6px;margin-bottom:16px;min-height:24px;font-size:10px;color:var(--muted)}.article-tag{padding:3px 9px;border:1px solid rgba(var(--orange-tint-rgb),0.0910);border-radius:6px;background:rgba(var(--orange-tint-rgb),0.0455);color:var(--orange-ink);font-weight:700}.category-column:nth-child(2) .article-tag{border-color:rgba(var(--blue-rgb),0.0980);background:rgba(var(--blue-rgb),0.0420);color:var(--blue-ink)}
    .article-card h4{font-size:17px;line-height:1.65;font-weight:750;letter-spacing:-.3px}.article-card h4 a{transition:color .2s}.article-card h4 a:hover{color:var(--blue);text-decoration:underline;text-underline-offset:4px;}.summary{margin-top:13px;font-size:12px;line-height:1.95;color:var(--muted)}
    .article-footer{margin-top:auto;padding-top:20px}.source-name{display:block;margin-bottom:5px;color:var(--muted);font-size:10px;line-height:1.7}.read-more{display:inline-flex;align-items:center;gap:7px;min-height:44px;padding:5px 11px;border:1px solid rgba(var(--orange-tint-rgb),0.1170);border-radius:8px;background:#EDF4FF;color:var(--blue);font-size:11px;font-weight:750;border-color:#C6D8F4;text-decoration:underline;text-underline-offset:4px;}.read-more:hover{color:var(--blue-ink);border-color:var(--blue);background:#E3EDFC;}.read-more svg{transition:transform .3s var(--ease)}.read-more:hover svg{transform:translateX(3px)}.related-link{display:inline-flex;align-items:center;min-height:40px;margin-left:10px;font-size:10px;color:var(--blue);text-decoration:underline;text-decoration-color:currentColor;text-underline-offset:4px;}.related-link:hover{color:var(--orange-ink)}
    .empty-state{min-height:190px;padding:42px 20px;text-align:center;border:1px dashed rgba(var(--orange-tint-rgb),0.2600);border-radius:20px;background:rgba(var(--orange-tint-rgb),0.0292)}.empty-state strong{display:block;margin-bottom:10px;font-size:20px}.empty-state p{font-size:13px;color:var(--muted)}.reset-results{min-height:44px;margin-top:15px;padding:7px 16px;border-radius:9px;background:rgba(var(--orange-tint-rgb),0.0780);color:var(--orange-ink);font-weight:700}
    .editorial-note{display:flex;justify-content:space-between;flex-wrap:wrap;gap:7px 20px;margin:25px 0 29px;font-size:11px;color:var(--muted)}.support-panel{display:flex;align-items:center;justify-content:space-between;gap:25px;padding:28px 32px;border:1px solid rgba(var(--orange-tint-rgb),0.1430);border-radius:19px;background:var(--surface-cool);border-color:var(--line);box-shadow:none;}.support-panel strong{font-size:18px}.support-panel p{margin-top:6px;font-size:12px;color:var(--muted)}.support-link{display:inline-flex;align-items:center;justify-content:center;flex:none;gap:9px;min-height:46px;padding:9px 16px;border:1px solid rgba(var(--orange-tint-rgb),0.1950);border-radius:10px;background:rgba(var(--orange-tint-rgb),0.0650);color:var(--orange-ink);font-size:12px;font-weight:750}.support-link:hover{color:var(--orange-ink);border-color:var(--orange)}
    .site-footer{padding:43px 0 24px;border-top:1px solid var(--line);background:#EDF2F7;}.footer-top{display:grid;grid-template-columns:1fr 1.25fr;gap:65px;margin-bottom:29px}.footer-brand>p{margin-top:12px;color:var(--muted);font-size:12px;line-height:1.9}.footer-links-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px}.footer-links-grid h3{margin-bottom:9px;color:var(--orange-ink);font-size:13px}.footer-links-grid a{display:flex;align-items:center;min-height:40px;color:var(--muted);font-size:12px}.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px 22px;padding-top:18px;border-top:1px solid var(--line);color:var(--muted);font-size:10px;align-items:center;}
    @media(max-width:1100px){.category-container{gap:18px}.article-card{padding:20px}.category-heading h3{font-size:17px}.main-navigation{gap:24px}.related-link{margin-left:6px}.footer-top{gap:35px}}
    @media(max-width:950px){.category-container{grid-template-columns:repeat(2,minmax(0,1fr))}.article-card{min-height:340px}.category-heading h3{font-size:19px}}
    @media(max-width:760px){.container{width:calc(100% - 40px)}.brand-logo{font-size:20px}.brand-logo svg{width:36px;height:36px}.menu-toggle{display:grid}.main-navigation{display:none;position:absolute;top:70px;left:0;right:0;flex-direction:column;align-items:stretch;height:auto;padding:16px 20px 22px;gap:4px;background:var(--surface-warm);border-bottom:1px solid var(--line);box-shadow:0 16px 30px rgba(var(--orange-tint-rgb),0.0585)}.main-navigation.is-open{display:flex}.main-navigation a{min-height:46px;padding:8px 14px}.main-navigation [aria-current="page"]::after{left:auto;right:14px;bottom:20px}.help-section{padding:22px 0 48px}.help-intro{margin-top:25px}.section-title{font-size:36px}.section-subtitle{font-size:13px}.help-hero-search{padding:17px;min-height:188px}.search-form{gap:8px;padding-left:12px}.search-form input{font-size:13px}.search-submit{min-width:66px;padding-inline:12px}.category-shortcuts{gap:8px;margin-bottom:25px}.category-shortcuts a{padding-inline:12px;font-size:11px}.footer-top{grid-template-columns:1fr;gap:28px}.footer-links-grid{gap:18px}.support-panel{padding:24px;align-items:start;flex-direction:column;gap:17px}}
    @media(max-width:620px){.category-container{grid-template-columns:minmax(0,1fr);gap:27px}.category-heading{min-height:56px;margin-bottom:10px}.category-heading h3{font-size:20px}.article-card{padding:23px;min-height:310px}.article-card h4{font-size:18px}.summary{font-size:13px}.article-meta{font-size:11px}.article-list{gap:14px}.list-toolbar{align-items:start;padding-bottom:11px}.help-hero-search{padding:16px 12px}.search-form{flex-wrap:wrap;column-gap:7px}.search-form>svg{width:18px;height:18px}.clear-search{width:28px}.search-submit{min-width:57px;padding-inline:8px;font-size:12px}.search-form input{font-size:12px}.search-hints{gap:0 12px}.intro-detail{font-size:11px}.section-title{font-size:34px;letter-spacing:-1px}.section-title span{display:block}.category-shortcuts a{gap:6px}.category-shortcuts svg{width:15px;height:15px}}
    @media(max-width:380px){.container{width:calc(100% - 32px)}.section-title{font-size:31px}.eyebrow{letter-spacing:1.3px;font-size:10px}.help-hero-search{padding:14px 9px}.search-form{gap:5px;padding-left:9px}.search-form>svg{display:none}.search-submit{min-width:49px}.search-form input{font-size:11px}.category-shortcuts{gap:6px}.category-shortcuts a{padding:8px 10px;font-size:10px}.article-card{padding:20px}.category-heading h3{font-size:19px}.footer-links-grid{gap:12px}.footer-links-grid h3,.footer-links-grid a{font-size:11px}}
    @media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}.article-card:hover,.article-card:focus-within{transform:none}}
  
    a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid var(--blue);outline-offset:4px}
    .main-navigation [aria-current="page"]{color:var(--ink);font-weight:800}