:root{--bg:#f6fafc;--surface:#fff;--wash:#eaf6fa;--wash2:#edf4f8;--cyan:#25c8d1;--sky:#25b6e8;--blue:#1787db;--navy:#174b78;--heading:#183a56;--body:#31485d;--muted:#687d8e;--line:#dce9f0;--footer:#123653;--radius:18px;--shadow:0 12px 34px rgba(24,58,86,.055)}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:130px}body{margin:0;background:var(--bg);color:var(--body);font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.8}body.drawer-open{overflow:hidden}a{color:var(--navy);text-decoration-thickness:1px;text-underline-offset:4px}a:hover{color:#077bb9}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--cyan);outline-offset:3px}button{font:inherit;cursor:pointer}img{max-width:100%;height:auto}.container{width:min(1180px,calc(100% - 56px));margin-inline:auto}.readable{max-width:780px}.skip-link{position:fixed;top:-80px;left:20px;z-index:300;background:#fff;padding:10px 16px}.skip-link:focus{top:12px}.site-header{position:relative;z-index:30;background:#fff}.masthead{height:72px;display:flex;align-items:center;gap:22px}.brand{display:inline-flex;align-items:center;text-decoration:none;gap:10px;flex:0 1 auto;min-width:0}.media--logo{max-height:38px;max-width:200px;background:transparent;border:0;border-radius:0}.media--logo img{max-height:38px;max-width:200px}.brand-fallback{font-size:23px;line-height:1.1;font-weight:800;letter-spacing:.025em;white-space:nowrap}.brand-fallback small{display:block;font-size:9px;font-weight:700;letter-spacing:.18em;color:var(--muted);margin-top:4px}.brand:has(img) .brand-fallback{display:none}.masthead-tagline{margin:0 auto;color:var(--muted);font-size:13px;letter-spacing:.12em}.masthead-tagline i{font-style:normal;color:var(--sky)}.entry-button,.button-primary{display:inline-flex;align-items:center;justify-content:center;gap:14px;white-space:nowrap;border-radius:11px;background:var(--navy);color:white;text-decoration:none;font-size:14px;font-weight:700;padding:10px 19px;min-height:42px}.entry-button:hover,.button-primary:hover{color:#fff;background:#126caa}.entry-button span{font-size:16px}.desktop-nav{background:var(--navy)}.nav-inner{height:48px;display:flex;align-items:stretch;justify-content:space-between;gap:18px}.nav-inner a{display:inline-flex;align-items:center;position:relative;color:#eaf7ff;white-space:nowrap;text-decoration:none;font-size:14px;padding:0 6px}.nav-inner a:hover,.nav-inner a[aria-current=page]{color:#fff}.nav-inner a[aria-current=page]:after{content:"";position:absolute;bottom:0;left:6px;right:6px;height:3px;background:var(--cyan);border-radius:3px 3px 0 0}.menu-toggle{display:none;width:40px;height:40px;border:1px solid var(--line);border-radius:10px;background:#fff;flex-direction:column;justify-content:center;align-items:center;gap:5px}.menu-toggle span{width:19px;height:2px;background:var(--heading);border-radius:2px}.drawer-overlay{position:fixed;inset:0;background:rgba(12,35,54,.52);z-index:100;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s,visibility .2s}.drawer-overlay.is-open{opacity:1;visibility:visible;pointer-events:auto}.site-drawer{position:fixed;top:0;bottom:0;left:0;width:min(86vw,344px);z-index:101;background:white;transform:translateX(-102%);visibility:hidden;pointer-events:none;transition:transform .24s,visibility .24s;box-shadow:16px 0 50px rgba(0,0,0,.13);display:flex;flex-direction:column}.site-drawer.is-open{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-top{padding:19px 20px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.drawer-title{font-weight:800;color:var(--heading);font-size:18px}.drawer-top button{border:0;background:var(--wash2);width:40px;height:40px;border-radius:10px;font-size:29px;line-height:1}.drawer-scroll{overflow:auto;padding:14px 20px 32px}.drawer-group{font-size:12px;font-weight:800;color:#688299;margin:22px 0 6px;letter-spacing:.12em}.drawer-scroll>a{display:block;padding:11px 8px;border-bottom:1px solid var(--line);text-decoration:none;font-size:15px;font-weight:600}.mobile-bottom{display:none}.back-top{position:fixed;right:24px;bottom:24px;z-index:25;width:44px;height:44px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--navy);box-shadow:var(--shadow);opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s}.back-top.is-visible{opacity:1;visibility:visible;pointer-events:auto}.eyebrow{font-size:11px!important;font-weight:800;letter-spacing:.15em;text-transform:uppercase;color:#1386a3!important;margin:0 0 12px!important;line-height:1.6}.section{padding:58px 0}.section--white{background:white}.section--wash{background:var(--wash2)}.section-head{max-width:790px;margin-bottom:27px}.section-head h2,.article-section h2{font-size:27px;line-height:1.35;letter-spacing:-.02em;color:var(--heading);margin:0 0 12px}.section-head>p:last-child{margin:0;color:var(--muted)}h1,h2,h3,h4{color:var(--heading);line-height:1.38}h1{letter-spacing:-.025em}h3{font-size:20px}p{margin:0 0 16px}strong{color:var(--heading)}.hero{padding:58px 0 52px;background:linear-gradient(125deg,#f7fbfd,#e9f7fa)}.hero-grid{display:grid;grid-template-columns:1.12fr .88fr;gap:58px;align-items:center}.hero h1{font-size:42px;line-height:1.3;margin:0 0 23px}.hero p:not(.eyebrow){font-size:16px;max-width:600px}.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px}.text-action{display:inline-flex;align-items:center;gap:7px;font-weight:700;text-decoration:none;padding:9px 1px;border-bottom:1px solid var(--blue)}.media{display:flex;justify-content:center;align-items:center;min-width:0;width:100%;overflow:hidden;border-radius:14px;background:var(--wash);border:1px solid #e2edf2}.media img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.media-placeholder{width:60%;height:55%;display:block;border:1px solid #d4e8ee;border-radius:12px;background:linear-gradient(135deg,#e9f5fa,#dcecf3)}.media--hero{height:clamp(250px,26vw,330px)}.media--feature{height:250px}.media--card{height:170px}.media--banner{height:220px}.media--mobile{height:350px;max-width:320px}.media--wide{background:#eef7fa}.media--portrait{max-width:330px;margin-inline:auto}.media--logo{height:auto}.media--logo .media-placeholder{display:none}.quickbar{background:white;border-bottom:1px solid var(--line)}.quickbar-inner{display:flex;flex-wrap:wrap;gap:18px 34px;padding:16px 0}.quickbar-group{display:flex;flex-wrap:wrap;gap:13px;align-items:baseline}.quickbar-group strong{font-size:13px}.quickbar-group a{font-size:13px;text-decoration:none;color:var(--muted)}.quickbar-group a:hover{text-decoration:underline;color:var(--navy)}.topic-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:13px}.topic-card{border:1px solid var(--line);background:white;border-radius:15px;padding:23px 22px 24px;display:flex;flex-direction:column;text-decoration:none;transition:border-color .2s,transform .2s}.topic-card:hover{border-color:var(--sky);transform:translateY(-2px)}.topic-card .topic-num{color:#0b95ab;font-weight:800;font-size:12px;letter-spacing:.13em}.topic-card strong{font-size:18px;margin:13px 0 8px}.topic-card span:last-child{color:var(--muted);font-size:14px;line-height:1.7}.topic-card:last-child{background:var(--wash)}.editorial-grid{display:grid;grid-template-columns:1.6fr 1fr;gap:20px}.editorial-main{border-radius:18px;padding:32px;background:var(--navy);color:#eaf7ff}.editorial-main h3{font-size:25px;color:white;margin:0 0 14px}.editorial-main strong{color:#fff}.editorial-main .eyebrow{color:#80e3e8!important}.editorial-main p{color:#e2f0f6}.editorial-main a{color:#fff}.editorial-side{display:grid;gap:16px}.editorial-mini{padding:23px 26px;background:var(--wash2);border-radius:16px}.editorial-mini h3{margin:0 0 9px}.editorial-mini p{font-size:14px;margin-bottom:10px}.editorial-mini a{font-weight:700}.split-feature{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}.split-feature.reverse .feature-copy{order:2}.split-feature.reverse .feature-visual{order:1}.feature-copy h2{font-size:27px;margin:0 0 16px}.feature-copy p{font-size:16px}.feature-copy .detail-list{margin:20px 0;padding-left:21px}.feature-copy .detail-list li{padding-bottom:7px}.rule-teasers{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.rule-teaser{border-top:3px solid var(--cyan);padding:24px;background:white;border-radius:0 0 13px 13px}.rule-teaser .num{font-weight:800;color:var(--blue);font-size:13px}.rule-teaser h3{margin:12px 0}.rule-teaser p{font-size:14px}.path-steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;counter-reset:path}.path-step{position:relative;border:1px solid var(--line);border-radius:14px;background:white;padding:22px}.path-step:before{counter-increment:path;content:counter(path,decimal-leading-zero);color:#1386a3;font-weight:800;font-size:14px}.path-step h3{font-size:18px;margin:11px 0 8px}.path-step p{font-size:14px;margin:0}.editor-note{font-size:14px;border-top:1px solid var(--line);padding:22px 0 30px;color:var(--muted)}.page-intro{padding:45px 0 30px}.page-intro .eyebrow{margin-bottom:10px!important}.page-intro h1{font-size:35px;margin:0 0 19px;max-width:950px}.page-intro p{font-size:16px;max-width:810px}.page-intro.compact{padding-bottom:14px}.article-section{padding:32px 0}.article-section h2{margin-bottom:20px}.article-section h3{margin:23px 0 10px}.article-section p,.article-section li{line-height:1.83}.article-section ul,.article-section ol{padding-left:22px}.article-section li{margin-bottom:8px}.article-rule{border:0;border-top:1px solid var(--line);margin:10px 0}.content-panel{background:white;border:1px solid var(--line);border-radius:17px;padding:28px}.content-panel--wash{background:var(--wash2)}.two-col{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:23px}.three-col{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:17px}.compare-wrap{max-width:100%;overflow-x:auto;border:1px solid var(--line);border-radius:13px;background:#fff}.compare{width:100%;border-collapse:collapse;min-width:590px;text-align:left}.compare th,.compare td{padding:15px 18px;border-bottom:1px solid var(--line);vertical-align:top;font-size:14px}.compare th{background:var(--wash2);color:var(--heading)}.compare tr:last-child td{border-bottom:0}.compare tbody th{background:white;white-space:nowrap}.timeline{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.timeline-item{border-left:3px solid var(--sky);padding:5px 19px}.timeline-item h3{margin:5px 0 8px}.timeline-item p{font-size:14px}.note{padding:18px 20px;border-left:3px solid var(--cyan);background:var(--wash2);border-radius:0 12px 12px 0;font-size:14px}.related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.related-item{display:flex;flex-direction:column;border:1px solid var(--line);padding:23px;background:#fff;border-radius:14px;text-decoration:none;min-height:177px;position:relative}.related-item strong{font-size:18px;margin-bottom:8px}.related-item>span:nth-child(3){font-size:14px;color:var(--muted);padding-right:12px}.related-item .arrow{position:absolute;right:19px;top:21px;font-size:20px;color:var(--blue)}.article-layout{display:grid;grid-template-columns:minmax(0,760px) minmax(190px,240px);gap:38px;align-items:start}.sidebar{position:sticky;top:20px;background:var(--wash2);padding:23px;border-radius:14px}.sidebar h2{font-size:20px}.sidebar dl{margin:0}.sidebar dt{font-weight:800;margin-top:15px;color:var(--heading)}.sidebar dd{margin:3px 0 0;font-size:14px}.contents{padding:20px 23px;border:1px solid var(--line);background:white;border-radius:13px;margin:12px 0 24px}.contents strong{display:block;margin-bottom:7px}.contents a{display:inline-block;margin:5px 16px 5px 0;font-size:14px}.numbered{display:grid;gap:12px}.numbered-item{padding:21px;background:var(--wash2);border-radius:12px}.numbered-item strong{display:block;font-size:18px;margin-bottom:6px}.numbered-item p{margin:0}.project-matrix{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.project-matrix article{padding:24px;background:white;border:1px solid var(--line);border-radius:15px}.project-matrix h3{margin:4px 0 14px}.project-matrix dl{margin:0}.project-matrix dt{font-weight:800;color:var(--navy);margin-top:15px}.project-matrix dd{margin:2px 0 0;font-size:14px}.gallery{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}.gallery figure{margin:0;background:#fff;padding:14px;border:1px solid var(--line);border-radius:15px}.gallery figcaption{padding:11px 5px 4px;font-size:14px}.gallery figcaption strong{display:block;font-size:17px;margin-bottom:5px}.gallery .media{height:230px}.gallery .media--portrait{max-width:none}.faq{display:grid;gap:10px}.faq details{background:white;border:1px solid var(--line);border-radius:12px;padding:0 19px}.faq summary{cursor:pointer;color:var(--heading);font-weight:700;padding:15px 24px 15px 0;position:relative;list-style:none}.faq summary::-webkit-details-marker{display:none}.faq summary:after{content:'+';position:absolute;right:0;font-size:23px;line-height:1}.faq details[open] summary:after{content:'−'}.faq details p{font-size:14px;color:var(--body);margin:0;padding:0 0 16px}.guide-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.guide-links a{display:block;background:var(--wash2);padding:16px 20px;border-radius:12px;text-decoration:none;font-weight:700}.site-footer{background:var(--footer);color:#eaf7ff;padding:48px 0 0}.footer-layout{display:grid;grid-template-columns:1fr 1fr;gap:70px}.footer-brand{font-size:25px;font-weight:800;line-height:1.2}.footer-brand small{display:block;font-size:10px;letter-spacing:.16em;margin-top:6px;color:#b0cfdd}.footer-lead p{max-width:440px;font-size:14px;color:#d2e5ed;margin-top:20px}.footer-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px 16px;align-content:start}.footer-links a{font-size:14px;color:#eaf7ff;text-decoration:none}.footer-links a:hover{text-decoration:underline}.footer-bottom{display:flex;justify-content:space-between;gap:30px;margin-top:35px;padding:19px 0;border-top:1px solid #426078;color:#bacfdb;font-size:12px}#main-content{min-height:35vh}@media(max-width:980px){.menu-toggle{display:flex}.desktop-nav{display:none}.masthead{height:64px;gap:12px;justify-content:space-between}.masthead-tagline{display:none}.brand{margin-inline:auto}.brand-fallback{font-size:20px}.media--logo img{max-height:30px}.entry-button{min-height:40px;padding:8px 13px;font-size:12px}.topic-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.hero-grid{gap:25px}.hero h1{font-size:36px}.article-layout{grid-template-columns:minmax(0,1fr)}.sidebar{position:static}.footer-layout{gap:30px}}@media(max-width:760px){.container{width:calc(100% - 44px)}.hero{padding:35px 0}.hero-grid{grid-template-columns:1fr}.hero .feature-visual{order:-1}.hero h1{font-size:31px}.hero-grid>.hero-visual{order:-1}.media--hero{height:220px}.section{padding:38px 0}.split-feature,.editorial-grid{grid-template-columns:1fr;gap:21px}.split-feature.reverse .feature-copy,.split-feature.reverse .feature-visual{order:initial}.topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.rule-teasers,.project-matrix,.related-grid,.three-col{grid-template-columns:1fr}.path-steps{grid-template-columns:repeat(2,minmax(0,1fr))}.timeline{grid-template-columns:1fr}.footer-layout{grid-template-columns:1fr}.footer-bottom{flex-direction:column;gap:5px}.page-intro h1{font-size:29px}.article-section{padding:24px 0}.gallery{gap:12px}.gallery .media{height:190px}.two-col{grid-template-columns:1fr}.mobile-bottom{display:grid;position:fixed;bottom:0;left:0;right:0;z-index:40;grid-template-columns:repeat(4,1fr);background:#fff;border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom);box-shadow:0 -4px 20px rgba(16,44,62,.07)}.mobile-bottom a{text-decoration:none;text-align:center;font-size:11px;font-weight:700;padding:7px 2px 5px;color:var(--muted);line-height:1.4}.mobile-bottom a span{display:block;font-size:19px;line-height:1.2}.mobile-bottom a[aria-current=page]{color:var(--blue)}.site-footer{padding-bottom:66px}.back-top{bottom:82px;right:12px}}@media(max-width:640px){body{font-size:15px}.container{width:calc(100% - 32px)}.masthead{height:62px}.brand-fallback{font-size:18px}.brand-fallback small{font-size:8px}.entry-button{padding:8px 10px;gap:5px}.hero h1{font-size:29px}.hero p:not(.eyebrow){font-size:15px}.hero-actions{margin-top:20px}.quickbar-inner{gap:8px;padding:13px 0}.quickbar-group{gap:10px}.quickbar-group strong,.quickbar-group a{font-size:12px}.topic-card{padding:17px 15px}.topic-card strong{font-size:16px}.topic-card span:last-child{font-size:13px}.section-head h2,.article-section h2,.feature-copy h2{font-size:22px}.section-head{margin-bottom:19px}.page-intro{padding:30px 0 14px}.page-intro h1{font-size:27px}.page-intro p{font-size:15px}.content-panel{padding:19px}.editorial-main{padding:24px}.editorial-main h3{font-size:22px}.editorial-mini{padding:19px}.gallery{grid-template-columns:1fr}.gallery .media{height:190px}.media--feature{height:180px}.media--card{height:145px}.media--banner{height:150px}.media--mobile{height:290px;max-width:250px}.media--hero{height:200px}.path-step{padding:16px}.path-step h3{font-size:16px}.path-step p{font-size:13px}.footer-links{grid-template-columns:repeat(2,minmax(0,1fr))}.related-item{min-height:145px}.project-matrix article{padding:19px}}@media(max-width:360px){.entry-button{font-size:11px}.brand-fallback{font-size:16px}.brand-fallback small{letter-spacing:.08em}.topic-grid,.path-steps{grid-template-columns:1fr}}@media(max-height:460px) and (max-width:760px){.mobile-bottom{position:static}.site-footer{padding-bottom:0}.back-top{bottom:16px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}
