:root{--page:#f6fafc;--surface:#fff;--soft:#eaf6fa;--soft2:#edf4f8;--cyan:#25c8d1;--sky:#25b6e8;--blue:#1787db;--sea:#174b78;--heading:#183a56;--text:#31485d;--muted:#687d8e;--line:#dce9f0;--shadow:0 10px 28px rgba(24,58,86,.065)}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:35px}body{margin:0;background:var(--page);color:var(--text);font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif;overflow-x:hidden}a{color:var(--sea);text-underline-offset:4px}a:hover{color:#0874b7}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--sky);outline-offset:3px}button{font:inherit;cursor:pointer}.container{width:min(100% - 56px,1180px);margin-inline:auto}.site-header{background:white;border-bottom:1px solid var(--line)}.topbar{min-height:72px;display:flex;align-items:center;gap:24px}.brand{display:flex;align-items:center;text-decoration:none;min-width:0}.brand-fallback{font-weight:800;font-size:19px;color:var(--heading)}.brand:has(img) .brand-fallback{display:none}.header-motto{margin:auto;color:var(--muted);font-size:14px;letter-spacing:.08em}.entry-button,.button-primary{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:7px 24px;border-radius:10px;background:linear-gradient(120deg,#1787db,#188ca8);color:#fff;text-decoration:none;font-weight:700;white-space:nowrap}.entry-button:hover,.button-primary:hover{color:#fff;background:#174b78}.desktop-nav{background:var(--sea)}.nav-inner{display:flex;align-items:stretch;justify-content:space-between;gap:10px;min-height:49px}.desktop-nav a{font-size:14px;white-space:nowrap;color:#edf7ff;text-decoration:none;display:flex;align-items:center;padding:8px 9px;border-bottom:3px solid transparent}.desktop-nav a:hover,.desktop-nav a.is-current{color:white;border-color:#77e8ef}.menu-toggle{display:none}.skip-link{position:absolute;left:12px;top:-90px;padding:8px;background:white;z-index:100}.skip-link:focus{top:10px}.mobile-drawer,.drawer-shade{display:none}.page-section{padding:52px 0}.section-white{background:white}.section-soft{background:var(--soft)}.section-soft2{background:var(--soft2)}.eyebrow{display:inline-block;color:#087b9c;font-weight:700;font-size:13px;letter-spacing:.14em;margin-bottom:8px}.hero{padding:64px 0 48px}.hero-grid,.split,.feature-duo,.section-grid{display:grid;grid-template-columns:minmax(0,1.12fr) minmax(0,.88fr);gap:36px;align-items:center}.hero h1{font-size:clamp(27px,3.3vw,42px);line-height:1.35;margin:8px 0 20px;letter-spacing:-.025em}.hero p{max-width:620px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:25px}.button-outline{display:inline-flex;align-items:center;justify-content:center;padding:7px 20px;border:1px solid #8bb4cb;border-radius:10px;text-decoration:none;min-height:42px;font-weight:700;background:#fff}.quick-path{background:white;border-bottom:1px solid var(--line);padding:17px 0}.quick-path-inner{display:flex;flex-wrap:wrap;gap:12px 32px}.quick-path strong{font-size:14px;color:var(--heading);margin-right:8px}.quick-path a{font-size:14px;margin-right:10px}.section-heading{margin-bottom:27px;max-width:780px}.section-heading h2{margin:0 0 10px;font-size:clamp(21px,2.4vw,27px)}.section-heading p{margin:0;color:var(--muted)}h1,h2,h3{color:var(--heading);line-height:1.4}h2{font-size:clamp(20px,2.2vw,27px)}h3{font-size:19px}p{margin:0 0 16px}p:last-child{margin-bottom:0}.topic-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:15px}.topic-card{border:1px solid var(--line);border-radius:15px;background:white;padding:22px;min-width:0}.topic-card h3{font-size:17px;margin:0 0 9px}.topic-card p{font-size:14px;color:var(--muted);line-height:1.75;margin-bottom:12px}.topic-card a{font-weight:700}.editor-grid{display:grid;grid-template-columns:2fr 1fr;gap:18px}.editor-main,.editor-side>article,.info-panel,.feature-article{padding:25px;background:white;border:1px solid var(--line);border-radius:15px}.editor-side{display:grid;gap:18px}.editor-main h3,.editor-side h3{margin-top:0}.link-line{display:inline-block;font-weight:700;margin-top:9px}.section-grid{align-items:start}.section-grid.reverse{grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr)}.section-grid h2{margin-top:0}.knowledge-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.knowledge-grid>article{padding:24px;border-top:4px solid var(--cyan);background:#fff;border-radius:12px}.knowledge-grid h3{margin-top:0}.steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;counter-reset:step}.step{counter-increment:step;padding:21px;border-radius:13px;background:white;border:1px solid var(--line)}.step:before{content:counter(step,decimal-leading-zero);display:block;color:#087b9c;font-weight:800;font-size:22px}.step h3{font-size:17px;margin:8px 0}.page-intro{padding:44px 0 29px}.page-intro h1{font-size:clamp(25px,3vw,36px);margin:5px 0 15px}.page-intro p{max-width:800px}.article-shell{padding-bottom:60px}.article-flow{max-width:780px}.article-flow h2,.article-shell h2{margin:35px 0 14px}.article-flow h2:first-child{margin-top:0}.article-flow p{line-height:1.85}.article-aside-layout{display:grid;grid-template-columns:minmax(0,760px) minmax(0,240px);gap:35px;align-items:start}.side-note{background:var(--soft);border-radius:14px;padding:18px;position:sticky;top:20px}.side-note h2{font-size:19px;margin:0 0 12px}.side-note ul{padding-left:18px;margin:0}.side-note li{margin:8px 0}.comparison-wrap{max-width:100%;overflow-x:auto;border:1px solid var(--line);border-radius:12px;background:white}table{width:100%;border-collapse:collapse;min-width:520px;text-align:left}th,td{padding:14px 15px;border-bottom:1px solid var(--line);vertical-align:top}th{color:var(--heading);background:var(--soft);font-weight:700}tr:last-child td{border-bottom:0}.two-up{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.mini-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:17px}.mini-grid article,.two-up article,.resource{border:1px solid var(--line);border-radius:13px;padding:20px;background:white}.mini-grid h3,.two-up h3{margin-top:0}.number-list{counter-reset:item;list-style:none;padding:0}.number-list li{counter-increment:item;margin-bottom:16px;padding:12px 15px 12px 54px;position:relative;background:white;border-left:2px solid var(--cyan);border-radius:8px}.number-list li::before{content:counter(item);position:absolute;left:16px;top:13px;font-weight:800;color:#087b9c}.project-matrix{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.project-matrix article{padding:24px;background:white;border:1px solid var(--line);border-radius:14px}.project-matrix h2{font-size:20px;margin:0 0 9px}.gallery-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.gallery-grid figure{margin:0;background:white;border-radius:14px;border:1px solid var(--line);padding:14px}.gallery-grid figcaption{padding:13px 5px 6px;font-size:14px;color:var(--muted)}.gallery-grid strong{color:var(--heading);display:block;font-size:16px;margin-bottom:5px}.manual-section{padding:35px 0;border-top:1px solid var(--line)}.manual-section:first-child{border-top:0}.manual-nav{display:flex;flex-wrap:wrap;gap:10px;margin:15px 0 34px}.manual-nav a{padding:8px 14px;border:1px solid #b2cedc;border-radius:9px;background:white;text-decoration:none}.related{margin-top:40px;border-top:1px solid var(--line);padding-top:22px}.related h2{font-size:22px}.related-links{display:flex;gap:12px;flex-wrap:wrap}.related-links a{padding:12px 17px;background:var(--soft);border-radius:9px;text-decoration:none;font-weight:700}.faq-list{display:grid;gap:10px;max-width:850px}.faq-list details{background:white;border:1px solid var(--line);border-radius:11px;padding:13px 18px}.faq-list summary{font-weight:700;color:var(--heading);cursor:pointer}.faq-list details p{padding-top:10px;font-size:15px}.callout{padding:22px 26px;border-left:4px solid var(--cyan);background:var(--soft);border-radius:5px 12px 12px 5px}.callout h2,.callout h3{margin-top:0}.site-footer{background:#123653;color:#eaf7ff}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:48px;padding:48px 0}.footer-grid p{font-size:14px;color:#cfe4f2;max-width:490px}.footer-brand{font-size:21px}.footer-brand small{font-size:11px;display:block;letter-spacing:.14em}.footer-grid nav{display:flex;flex-direction:column;gap:8px}.footer-grid nav strong{margin-bottom:6px}.footer-grid a,.footer-bottom a{color:#eaf7ff}.footer-disclaimer{opacity:.85}.footer-bottom{padding:13px 0 20px;border-top:1px solid #355a76;display:flex;justify-content:space-between;font-size:13px}.media{display:flex;align-items:center;justify-content:center;max-width:100%;min-width:0;background:var(--soft);border-radius:14px;overflow:hidden}.media img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.media-placeholder{width:100%;height:100%;background:linear-gradient(135deg,#eaf6fa,#d9eef5)}.media--logo{max-width:210px;max-height:38px;width:auto;background:transparent;border-radius:0}.media--logo img{max-height:38px}.media--logo .media-placeholder{display:none}.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}.site-header .brand .media--logo:has(.media-placeholder){display:none}.site-footer .media{display:none}.mobile-bottom{display:none}
@media(max-width:1100px){.topic-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.container{width:min(100% - 44px,1180px)}}
@media(max-width:980px){.desktop-nav{display:none}.topbar{height:63px;min-height:63px;justify-content:space-between;gap:12px}.header-motto{display:none}.menu-toggle{display:flex;width:40px;height:40px;flex:0 0 40px;flex-direction:column;align-items:center;justify-content:center;gap:5px;background:white;border:1px solid var(--line);border-radius:9px}.menu-toggle span{display:block;width:19px;height:2px;background:var(--heading)}.brand{margin-right:auto}.brand .media--logo{max-height:30px}.brand .media--logo img{max-height:30px}.entry-button{min-height:39px;padding:5px 13px;font-size:13px}.drawer-shade{display:block;position:fixed;inset:0;z-index:90;background:rgba(15,34,50,.5);visibility:hidden;opacity:0;pointer-events:none;transition:opacity .2s}.mobile-drawer{display:flex;position:fixed;z-index:91;inset:0 auto 0 0;width:min(86vw,344px);background:#fff;flex-direction:column;padding:18px 18px 32px;overflow-y:auto;visibility:hidden;transform:translateX(-101%);pointer-events:none;transition:transform .22s,visibility .22s;box-shadow:var(--shadow)}.drawer-open{overflow:hidden}.drawer-open .drawer-shade{visibility:visible;opacity:1;pointer-events:auto}.drawer-open .mobile-drawer{visibility:visible;transform:translateX(0);pointer-events:auto}.drawer-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}.drawer-close{font-size:30px;background:transparent;border:0;line-height:1;width:40px;height:40px}.drawer-group{font-weight:800;font-size:13px;color:#47788e;border-bottom:1px solid var(--line);margin:15px 0 5px}.mobile-drawer>a{display:block;text-decoration:none;padding:8px 10px;border-radius:8px}.mobile-drawer>a.is-current{background:var(--soft);font-weight:700}.mobile-bottom{position:fixed;z-index:30;display:grid;grid-template-columns:repeat(4,1fr);bottom:0;left:0;right:0;background:#fff;border-top:1px solid var(--line);padding:5px 0 max(5px,env(safe-area-inset-bottom));box-shadow:0 -3px 12px #12365310}.mobile-bottom a{text-align:center;font-size:13px;text-decoration:none;font-weight:700;padding:6px}body{padding-bottom:58px}.footer-grid{grid-template-columns:2fr 1fr 1fr;gap:24px}.article-aside-layout{grid-template-columns:minmax(0,1fr) 210px;gap:20px}}
@media(max-width:760px){.hero-grid,.split,.feature-duo,.section-grid,.section-grid.reverse,.editor-grid,.article-aside-layout{grid-template-columns:1fr}.editor-side{grid-template-columns:repeat(2,minmax(0,1fr))}.side-note{position:static}.topic-grid,.project-matrix,.mini-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.hero{padding:35px 0}.hero-grid .media{order:-1}.page-section{padding:34px 0}.footer-grid{grid-template-columns:1fr 1fr}.footer-grid>div{grid-column:1/-1}.knowledge-grid{grid-template-columns:1fr}.steps{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:640px){.container{width:calc(100% - 32px)}.hero h1{font-size:29px}.page-intro h1{font-size:27px}.page-intro{padding:30px 0 18px}.topic-grid,.project-matrix,.mini-grid,.gallery-grid,.editor-side,.two-up{grid-template-columns:1fr}.topic-card{padding:17px}.editor-main,.editor-side>article{padding:20px}.hero-grid,.section-grid{gap:20px}.media--hero{height:200px}.media--feature{height:180px}.media--card{height:145px}.media--banner{height:150px}.media--mobile{height:290px;max-width:250px}.steps{grid-template-columns:1fr 1fr}.step{padding:15px}.footer-grid{padding:34px 0;gap:22px}.footer-bottom{gap:10px;flex-wrap:wrap}.quick-path-inner{display:grid;gap:8px}.quick-path a{display:inline-block;margin-right:10px}.section-heading{margin-bottom:18px}.page-section{padding:30px 0}}
@media(max-height:480px) and (max-width:980px){.mobile-bottom{position:static}body{padding-bottom:0}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}

.nojs-nav{display:flex;flex-wrap:wrap;gap:8px;padding:12px 0}.nojs-nav a{display:inline-block;padding:5px 9px;border:1px solid var(--line);border-radius:6px;background:white}.nojs-nav a.is-current{font-weight:700}