:root{--base:#F6FAFC;--white:#fff;--soft:#EAF6FA;--soft2:#EDF4F8;--cyan:#25C8D1;--sky:#25B6E8;--blue:#1787DB;--deep:#174B78;--heading:#183A56;--text:#31485D;--muted:#687D8E;--line:#DCE9F0;--footer:#123653}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--base);font:16px/1.8 Arial,'PingFang SC','Microsoft YaHei',sans-serif;color:var(--text);overflow-x:hidden}button,a{font:inherit}a{color:var(--deep);text-underline-offset:4px}a:hover{color:var(--blue)}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--cyan);outline-offset:3px}img{max-width:100%}h1,h2,h3,p{margin-top:0}h1,h2,h3{color:var(--heading);line-height:1.38}h1{font-size:clamp(32px,3.5vw,42px);letter-spacing:-.035em}h2{font-size:26px}h3{font-size:20px}p{margin-bottom:18px}.wrap{width:calc(100% - 56px);max-width:1180px;margin-inline:auto}.section{margin-block:58px}.eyebrow{display:inline-block;color:#147eaa;text-transform:uppercase;font-size:12px;letter-spacing:.16em;font-weight:800;margin-bottom:9px}.lead{font-size:17px;line-height:1.85;color:#405c71}.muted{color:var(--muted)}.skip-link{position:absolute;left:12px;top:-80px;z-index:99;background:white;padding:9px}.skip-link:focus{top:10px}.site-header{background:#fff;border-bottom:1px solid var(--line);position:relative;z-index:12}.topbar{height:72px;display:flex;align-items:center;gap:25px}.brand{display:flex;align-items:center;min-width:170px;text-decoration:none}.brand-fallback{color:var(--deep);font-size:22px;line-height:1.1;font-weight:900;letter-spacing:.04em}.brand-fallback b{color:#17b4c8}.brand-fallback 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.15s}.directory-card:hover{border-color:#78c5d3;transform:translateY(-2px)}.directory-card strong{display:block;font-size:18px;color:var(--heading);margin-bottom:8px}.directory-card p{font-size:14px;line-height:1.75;color:var(--muted);margin:0}.directory-card .number{font-size:12px;font-weight:800;color:#168caa;display:block;margin-bottom:9px}.editor-grid{display:grid;grid-template-columns:2fr 1fr;gap:18px}.editor-primary,.editor-side,.panel,.topic-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:26px}.editor-primary{background:var(--soft)}.editor-primary h3{font-size:26px;max-width:620px}.editor-side article+article{border-top:1px solid var(--line);margin-top:20px;padding-top:20px}.text-link{font-weight:700;text-decoration:underline;text-decoration-color:#80b7ca}.split-feature{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:34px;align-items:center}.split-feature.reverse .media{order:-1}.split-feature 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h1{font-size:clamp(30px,3vw,36px);max-width:930px}.page-head .lead{max-width:870px}.content-section{margin-block:38px}.content-section h2{margin-bottom:18px}.content-section p{max-width:790px}.content-section h3{margin-top:26px;margin-bottom:10px}.content-narrow{max-width:780px}.reading-grid{display:grid;grid-template-columns:minmax(0,760px) minmax(210px,240px);gap:38px;align-items:start}.sidebar{background:var(--soft);border:1px solid #d5e7ed;border-radius:12px;padding:21px;position:sticky;top:16px}.sidebar h2{font-size:19px}.sidebar ul{padding-left:18px;margin-bottom:0}.sidebar li{margin:11px 0;font-size:14px}.grid-two{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.grid-three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.mini-card{padding:23px;border:1px solid var(--line);background:#fff;border-radius:12px}.mini-card h3{margin:0 0 8px}.mini-card p{font-size:15px;margin:0}.mini-card 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p{margin:0;font-size:15px}.anchor-menu{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:26px}.anchor-menu a{display:inline-block;padding:6px 13px;background:#e4f3f7;border-radius:6px;text-decoration:none;font-size:14px;font-weight:700}.gallery-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.gallery-item{padding:16px;background:white;border:1px solid var(--line);border-radius:13px}.gallery-item h3{font-size:18px;margin:14px 0 5px}.gallery-item p{font-size:14px;margin:0}.gallery-item .media{height:205px}.faq details{background:#fff;border:1px solid var(--line);border-radius:9px;padding:14px 18px;margin-bottom:10px}.faq summary{cursor:pointer;font-weight:700;color:var(--heading);line-height:1.5}.faq details p{margin:12px 0 0;font-size:15px}.related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.related-link{display:grid;grid-template-columns:1fr auto;gap:3px;padding:22px;background:#fff;border:1px solid var(--line);border-radius:12px;text-decoration:none}.related-link strong{color:var(--heading);font-size:18px}.related-link span:nth-child(2){grid-row:2;color:var(--muted);font-size:14px}.related-link span:last-child{grid-row:1;grid-column:2;font-size:20px;color:var(--blue)}.site-footer{background:var(--footer);color:#eaf7ff;padding-top:52px;margin-top:68px}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:60px}.footer-brand{font-size:23px;font-weight:800;color:white;text-decoration:none}.footer-brand span{font-size:11px;font-weight:500;margin-left:9px;letter-spacing:.12em}.footer-about p{max-width:440px;color:#d6e7f1;font-size:14px;margin:12px 0}.footer-about .footer-note{color:#b9d2e2;font-size:13px}.footer-links{display:flex;flex-direction:column;gap:7px}.footer-links strong{margin-bottom:5px}.footer-links a,.footer-bottom a{color:#eaf7ff;font-size:14px;text-decoration:none}.footer-links a:hover,.footer-bottom a:hover{text-decoration:underline}.footer-bottom{margin-top:38px;border-top:1px solid #315b76;padding:16px 0;display:flex;justify-content:space-between;font-size:13px;color:#c4dce8}.drawer-overlay,.mobile-drawer,.mobile-bottom{display:none}.mobile-bottom{z-index:10}
@media(max-width:980px){.wrap{width:calc(100% - 44px)}.topbar{height:64px;justify-content:space-between;gap:10px}.menu-toggle{display:block;flex:0 0 40px}.brand{min-width:0;justify-content:center;flex:1}.media--logo{height:30px;max-width:170px}.media--logo img{max-height:30px}.brand-fallback{font-size:17px}.brand-fallback small{font-size:8px}.topbar-note,.desktop-nav{display:none}.entry-button{min-height:40px;padding:7px 12px;font-size:13px}.quick-inner{flex-wrap:wrap;justify-content:flex-start;gap:4px 16px}.drawer-overlay{display:block;position:fixed;inset:0;background:rgba(13,38,57,.5);z-index:49;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s,visibility .2s}.mobile-drawer{display:block;position:fixed;inset:0 auto 0 0;width:min(86vw,344px);background:white;box-shadow:9px 0 35px #102e4430;z-index:50;transform:translateX(-104%);visibility:hidden;pointer-events:none;transition:transform .2s,visibility .2s;overflow-y:auto;padding:22px}.drawer-open{overflow:hidden}.drawer-open .drawer-overlay{opacity:1;visibility:visible;pointer-events:auto}.drawer-open .mobile-drawer{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-head{display:flex;align-items:center;justify-content:space-between;font-size:21px;color:var(--heading);border-bottom:1px solid var(--line);padding-bottom:14px}.drawer-close{border:0;background:#eaf6fa;color:var(--deep);font-size:30px;width:40px;height:40px;line-height:1;cursor:pointer}.drawer-group{border-bottom:1px solid var(--line);padding:15px 0;display:flex;flex-direction:column}.drawer-group>span{font-size:12px;letter-spacing:.12em;color:var(--muted);font-weight:800;margin-bottom:6px}.drawer-group a{padding:7px 10px;border-radius:6px;text-decoration:none;color:var(--heading)}.drawer-group a.is-active{background:var(--soft);font-weight:700;border-left:3px solid var(--cyan)}.drawer-foot{font-size:12px;color:var(--muted);margin-top:20px}.directory-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.reading-grid{grid-template-columns:minmax(0,1fr) 215px;gap:22px}}
@media(max-width:760px){.hero,.split-feature,.editor-grid,.reading-grid{grid-template-columns:1fr}.hero{padding-top:24px;gap:14px}.hero .media{order:-1}.split-feature .media,.split-feature.reverse .media{order:-1}.section{margin-block:38px}.sidebar{position:static}.rule-tiles,.grid-three,.related-grid{grid-template-columns:1fr}.path-steps{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-grid{gap:25px;grid-template-columns:1fr 1fr}.footer-about{grid-column:1/-1}.site-footer{margin-top:40px}}
@media(max-width:640px){body{font-size:15px}.wrap{width:calc(100% - 32px)}.topbar{height:62px}.entry-button{font-size:12px;padding:6px 10px;min-height:38px;gap:3px}.brand-fallback{font-size:15px}.brand-fallback small{font-size:7px}.quick-inner{padding-block:9px;line-height:1.9}.quick-inner span{width:100%}.quick-inner a{margin-left:7px}.hero h1{font-size:29px}.page-head{padding-top:30px}.page-head h1{font-size:27px}.lead{font-size:15px}.section-head h2,h2{font-size:22px}h3{font-size:18px}.directory-grid,.grid-two,.gallery-grid{grid-template-columns:1fr}.directory-card{min-height:auto;padding:17px}.editor-primary,.editor-side,.panel,.topic-card,.tinted{padding:19px}.editor-primary h3{font-size:22px}.media--hero{height:200px}.media--feature{height:180px}.media--card{height:145px}.media--banner{height:150px}.media--mobile{height:290px;max-width:250px}.gallery-item .media{height:175px}.path-steps{gap:12px}.footer-grid{grid-template-columns:1fr 1fr}.footer-bottom{gap:10px;flex-wrap:wrap}.mobile-bottom{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;bottom:0;left:0;right:0;min-height:55px;padding-bottom:env(safe-area-inset-bottom);background:#fff;border-top:1px solid var(--line);box-shadow:0 -4px 18px #12365312}.mobile-bottom a{display:flex;align-items:center;justify-content:center;text-decoration:none;color:var(--deep);font-weight:700;font-size:13px}.mobile-bottom a[aria-current=page]{border-top:3px solid var(--cyan);background:#eff9fb}body{padding-bottom:calc(58px + env(safe-area-inset-bottom))}.site-footer{margin-bottom:0}table{font-size:14px}.content-section{margin-block:29px}}@media(max-width:640px) and (max-height:480px){.mobile-bottom{position:static}body{padding-bottom:0}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}

.noscript-nav{display:flex;flex-wrap:wrap;gap:9px;padding:14px 0}.noscript-nav a{padding:5px 9px;background:#eaf6fa;border-radius:5px;text-decoration:none}.noscript-nav a.is-active{font-weight:700;border-bottom:2px solid #25c8d1}