:root{--bg:#f5fbff;--white:#fff;--light:#eaf7fc;--pale:#dff5fb;--cyan:#25c8d1;--sky:#25b6e8;--blue:#1787db;--navy:#174b78;--ink:#173b60;--body:#2d4359;--muted:#687f93;--border:#dcebf3;--shadow:0 16px 48px rgba(24,91,135,.08)}
*,*::before,*::after{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:88px}body{margin:0;font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.8;background:var(--bg);color:var(--body);overflow-x:hidden}body.drawer-open{overflow:hidden}a{color:var(--blue);text-decoration:none}a:hover{color:#1162a4}button{font:inherit;cursor:pointer}img{max-width:100%}h1,h2,h3,p{margin-top:0}h1,h2,h3{color:var(--ink);line-height:1.36;letter-spacing:-.02em}h1{font-size:clamp(27px,3.2vw,40px);font-weight:800}h2{font-size:clamp(20px,2.25vw,26px)}h3{font-size:19px}p{margin-bottom:16px}.container{width:min(1160px,calc(100% - 48px));margin-inline:auto}.skip-link{position:absolute;top:-80px;left:10px;z-index:1000;padding:10px 14px;background:#fff}.skip-link:focus{top:10px}.site-header{position:sticky;top:0;z-index:100;background:#fff;border-bottom:1px solid var(--border);box-shadow:0 4px 20px rgba(23,59,96,.04)}.topbar{height:72px;display:flex;gap:22px;align-items:center}.brand{display:inline-flex;align-items:center;min-width:170px;color:var(--ink)}.brand-image{display:block;width:auto;max-width:178px;height:38px;object-fit:contain}.brand-fallback{display:flex;align-items:center;gap:9px;font-size:19px;font-weight:800;color:var(--ink);line-height:1.14;white-space:nowrap}.brand-fallback small{display:block;font-size:9px;letter-spacing:.14em;color:var(--blue);margin-top:4px}.brand-glyph{width:38px;height:38px;display:grid;place-items:center;background:linear-gradient(135deg,var(--cyan),var(--blue));border-radius:11px;color:#fff;font-size:24px}.desktop-nav{display:flex;align-items:center;gap:clamp(10px,1.5vw,22px);margin-left:auto}.desktop-nav a{color:var(--navy);font-size:14px;white-space:nowrap;font-weight:600;position:relative;padding:8px 0}.desktop-nav a:hover,.desktop-nav a.active{color:var(--blue)}.desktop-nav a.active:after{content:"";position:absolute;bottom:-13px;left:0;right:0;height:3px;background:var(--cyan);border-radius:3px}.main-btn{display:inline-flex;align-items:center;justify-content:center;min-width:82px;height:42px;padding:0 20px;border-radius:999px;background:linear-gradient(110deg,#25c8d1,#25b6e8,#1787db);color:#fff;font-weight:700;white-space:nowrap;font-size:14px;box-shadow:0 7px 18px rgba(37,182,232,.18)}.main-btn:hover{color:#fff;filter:brightness(.96)}.menu-toggle{display:none;border:0;background:transparent;width:42px;height:42px;padding:10px;flex-direction:column;justify-content:center;gap:5px}.menu-toggle span{display:block;height:2px;width:100%;background:var(--ink);border-radius:2px}.drawer-overlay{position:fixed;inset:0;background:rgba(12,38,62,.53);z-index:110;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s,visibility .2s}.mobile-drawer{position:fixed;top:0;left:0;bottom:0;width:min(86vw,340px);background:#fff;z-index:111;transform:translateX(-105%);visibility:hidden;transition:transform .25s,visibility .25s;overflow-y:auto;padding:18px 22px 36px;box-shadow:15px 0 60px #10365222}.drawer-open .drawer-overlay{opacity:1;visibility:visible;pointer-events:auto}.drawer-open .mobile-drawer{transform:translateX(0);visibility:visible}.drawer-top{display:flex;justify-content:space-between;align-items:center;gap:10px}.drawer-top .brand-image{max-width:156px;height:32px}.drawer-close{border:0;background:var(--light);color:var(--ink);width:40px;height:40px;border-radius:50%;font-size:27px;line-height:1}.drawer-caption{font-size:13px;color:var(--muted);margin:12px 0 20px}.drawer-group{padding:14px 0;border-top:1px solid var(--border)}.drawer-group strong{display:block;font-size:13px;color:var(--blue);letter-spacing:.08em;margin-bottom:8px}.drawer-group a{display:block;padding:9px 4px;color:var(--body);font-size:15px}.site-footer{background:#123653;color:#eaf7ff;padding-top:44px}.site-footer h2{color:#fff;font-size:16px}.site-footer a{display:block;color:#eaf7ff;font-size:14px;margin:8px 0}.site-footer p{color:#d0e2ee;font-size:14px}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:60px}.footer-brand{display:inline-block!important;margin:0 0 16px!important}.footer-brand .brand-fallback{color:#fff}.footer-note{max-width:470px}.footer-bottom{border-top:1px solid #ffffff25;display:flex;justify-content:space-between;padding:15px 0 20px;font-size:12px;color:#bbd1e1}.footer-bottom a{font-size:12px;margin:0}.mobile-bottom{display:none}main{min-height:55vh}.eyebrow{display:inline-flex;align-items:center;gap:7px;color:#077ba8;text-transform:uppercase;letter-spacing:.14em;font-size:12px;font-weight:800;margin-bottom:13px}.eyebrow:before{content:"";width:18px;height:2px;background:var(--cyan)}.hero{padding:58px 0 46px;background:radial-gradient(circle at 77% 25%,#d8f5fd,transparent 44%),linear-gradient(150deg,#fff,#f1faff 63%,#e8f7fc)}.hero-grid{display:grid;grid-template-columns:1.07fr .93fr;align-items:center;gap:45px}.hero h1{margin-bottom:18px}.hero p{font-size:17px;max-width:590px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:25px}.outline-btn{display:inline-flex;align-items:center;justify-content:center;padding:9px 22px;border:1px solid #9bcfe6;border-radius:999px;font-weight:700;background:#fff;color:var(--navy)}.hero-keywords{display:flex;flex-wrap:wrap;gap:8px;margin-top:23px}.hero-keywords span,.tag{display:inline-block;padding:4px 12px;border-radius:30px;background:#e3f6fa;color:#187da9;font-size:12px;font-weight:700}.media{display:flex;justify-content:center;align-items:center;overflow:hidden;background:var(--light);border-radius:16px;width:100%;min-height:180px}.media img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.media-placeholder{height:100%;min-height:inherit;width:100%;display:grid;place-items:center;background:radial-gradient(circle at 23% 20%,#d6f4fb 0,transparent 45%),linear-gradient(140deg,#eaf7fc,#dff5fb)}.placeholder-shape{display:block;width:41%;aspect-ratio:1.5;border:2px solid #95dce6;border-radius:34% 66% 60% 40%;transform:rotate(-13deg);opacity:.46}.hero-media{height:312px}.feature-media{height:210px}.landscape-media{height:240px}.portrait-media{height:350px}.content-section{padding:42px 0}.section-header{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:22px}.section-header h2{margin:0}.section-header p{margin:6px 0 0;color:var(--muted)}.text-link{font-weight:700;white-space:nowrap}.panel{border:1px solid var(--border);background:#fff;border-radius:17px;padding:28px;box-shadow:var(--shadow)}.topic-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.topic-card{display:block;padding:26px;background:#fff;border:1px solid var(--border);border-radius:16px;color:var(--body);transition:transform .18s,box-shadow .18s}.topic-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}.topic-card h3{margin:12px 0 8px}.topic-card p{font-size:14px;margin:0}.topic-card .num{font-size:12px;letter-spacing:.08em;font-weight:800;color:#078aa9}.topic-card .arrow{color:var(--blue);display:block;margin-top:15px;font-weight:700;font-size:13px}.split{display:grid;grid-template-columns:1.1fr .9fr;gap:30px;align-items:center}.split.reverse{grid-template-columns:.9fr 1.1fr}.muted-section{background:#edf8fc}.page-hero{padding:50px 0 35px;background:linear-gradient(120deg,#fff,#e7f7fd)}.page-hero .container{max-width:1160px}.page-hero p{font-size:17px;max-width:810px}.page-hero h1{font-size:clamp(24px,2.85vw,34px);margin-bottom:14px}.page-kicker{font-size:13px;font-weight:700;color:var(--blue);margin-bottom:14px}.article-shell{padding-top:38px;padding-bottom:56px}.article{max-width:820px;margin:0 auto}.article p,.article li{line-height:1.82}.article h2{margin-top:34px;margin-bottom:14px}.article h3{margin-top:23px}.article ul,.article ol{padding-left:23px}.article li{margin:7px 0}.article .panel{margin:24px 0}.quote{border-left:4px solid var(--cyan);padding:17px 23px;background:#eaf7fc;color:var(--navy);font-size:18px;font-weight:700;margin:24px 0;border-radius:0 12px 12px 0}.columns-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.columns-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.mini-card{border:1px solid var(--border);border-radius:14px;background:#fff;padding:22px}.mini-card h3{margin:0 0 8px}.mini-card p{margin:0;font-size:15px}.section-num{font-size:12px;letter-spacing:.1em;color:var(--blue);font-weight:800}.lead{font-size:17px;color:var(--navy)}.data-table{width:100%;border-collapse:collapse;margin:20px 0;background:#fff;border-radius:12px;overflow:hidden;font-size:15px}.data-table th,.data-table td{border:1px solid var(--border);padding:13px 16px;text-align:left;vertical-align:top}.data-table th{background:#e8f7fb;color:var(--ink)}.related{margin:42px auto 0;max-width:1160px;padding-top:23px;border-top:1px solid var(--border)}.related h2{font-size:21px}.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.related a{display:flex;justify-content:space-between;gap:10px;background:#fff;border:1px solid var(--border);border-radius:12px;padding:15px 17px;color:var(--navy);font-weight:700}.related a span{color:var(--sky)}.number-list{counter-reset:step;list-style:none;padding-left:0!important}.number-list li{position:relative;padding:4px 0 14px 50px;counter-increment:step;min-height:53px}.number-list li:before{content:counter(step,decimal-leading-zero);position:absolute;left:0;top:2px;background:#e0f4f9;color:var(--blue);padding:4px 9px;border-radius:9px;font-weight:800;font-size:13px}.index-list{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.index-list a{background:#fff;border:1px solid var(--border);border-radius:12px;padding:15px 18px;color:var(--ink);font-weight:700}.index-list small{display:block;font-weight:400;color:var(--muted)}.article-feature{padding:22px 0 6px}.visual-gallery{display:grid;grid-template-columns:1.2fr 1fr;gap:22px}.visual-gallery .media{height:255px}.visual-gallery .media:nth-child(2){height:255px}.faq details{border-bottom:1px solid var(--border);padding:15px 0}.faq summary{cursor:pointer;font-weight:700;color:var(--ink)}.faq p{margin:8px 0 0}.callout{background:linear-gradient(110deg,#ddf6f8,#e9f5fd);padding:24px;border-radius:16px;border:1px solid #c6eaf4}.callout 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@media(max-width:1100px){.topbar{gap:12px}.desktop-nav{gap:12px}.desktop-nav a{font-size:13px}.brand{min-width:140px}.brand-image{max-width:143px}}@media(max-width:980px){.desktop-nav{display:none}.menu-toggle{display:flex}.topbar{height:60px;justify-content:space-between;gap:8px}.brand{position:absolute;left:50%;transform:translateX(-50%);min-width:0;max-width:calc(100% - 190px);justify-content:center}.brand-image{height:29px;max-width:150px}.brand-fallback{font-size:16px}.brand-glyph{width:30px;height:30px;font-size:19px}.entry-link{height:40px;padding:0 13px;font-size:12px;min-width:80px;margin-left:auto}.hero-grid{gap:25px}.hero-media{height:265px}.footer-grid{gap:25px}}@media(max-width:700px){html{scroll-padding-top:65px}.container{width:calc(100% - 32px)}body{font-size:15px;padding-bottom:65px}.hero{padding:31px 0}.hero-grid,.split,.split.reverse{grid-template-columns:1fr}.hero-grid .hero-media{order:-1;height:205px}.hero h1{font-size:29px}.hero p,.page-hero p{font-size:15px}.hero-actions{margin-top:18px}.hero-keywords{margin-top:18px}.content-section{padding:27px 0}.section-header{align-items:start}.topic-grid,.columns-3{grid-template-columns:1fr 1fr;gap:12px}.topic-card{padding:18px}.topic-card h3{font-size:17px}.topic-card p{font-size:13px}.panel{padding:19px}.page-hero{padding:33px 0 24px}.page-hero h1{font-size:27px}.article-shell{padding-top:25px;padding-bottom:35px}.article h2{margin-top:28px}.columns-2,.index-list,.visual-gallery{grid-template-columns:1fr}.media{border-radius:12px}.feature-media,.landscape-media{height:180px}.portrait-media{height:285px}.related-grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr;gap:26px}.footer-grid>div:first-child{grid-column:1/-1}.site-footer{padding-top:32px}.footer-bottom{flex-direction:column;gap:6px}.mobile-bottom{display:grid;position:fixed;bottom:0;left:0;right:0;grid-template-columns:repeat(4,1fr);height:calc(58px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:#fff;border-top:1px solid var(--border);z-index:90;box-shadow:0 -6px 20px #23496310}.mobile-bottom a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:0;color:var(--muted);font-size:11px;line-height:1.6}.mobile-bottom a span{font-size:20px;line-height:1.2}.mobile-bottom a[aria-current=page]{color:var(--blue)}.data-table{font-size:13px}.data-table th,.data-table td{padding:10px}.flow-steps{grid-template-columns:1fr}}@media(max-width:390px){.brand-fallback{font-size:14px}.brand-glyph{width:26px;height:26px}.entry-link{min-width:72px;padding:0 10px}.topic-grid{grid-template-columns:1fr}.section-header{display:block}.section-header .text-link{display:inline-block;margin-top:8px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}