:root{--bg:#f5fbff;--white:#fff;--mist:#eaf7fc;--ice:#dff5fb;--cyan:#25c8d1;--sky:#25b6e8;--blue:#1787db;--navy:#174b78;--title:#173b60;--text:#2d4359;--muted:#687f93;--line:#dcebf3;--shadow:0 16px 48px rgba(23,75,120,.07)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif}body.drawer-open{overflow:hidden}a{color:var(--blue);text-underline-offset:4px}a:hover{color:#0c6ba9}button{font:inherit}img{max-width:100%}.wrap{width:min(1160px,calc(100% - 48px));margin-inline:auto}.skip-link{position:absolute;top:-80px;left:12px;z-index:100;background:#fff;padding:8px 14px}.skip-link:focus{top:10px}.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:30;box-shadow:0 4px 22px rgba(23,75,120,.035)}.head-inner{height:72px;display:flex;align-items:center;gap:20px}.brand{display:flex;align-items:center;flex-shrink:0;gap:7px;color:var(--title);text-decoration:none}.brand img{height:38px;width:auto;max-width:160px;object-fit:contain}.brand-sign{background:linear-gradient(135deg,var(--cyan),var(--blue));color:#fff;border-radius:12px;font-weight:900;font-size:28px;line-height:40px;width:42px;text-align:center}.brand-sign span{font-size:10px;vertical-align:super}.brand-words{display:flex;flex-direction:column;line-height:1.1}.brand-words strong{font-size:18px;letter-spacing:1px}.brand-words small{font-size:9px;letter-spacing:1.4px;color:var(--navy);margin-top:4px}.desktop-nav{display:flex;align-items:center;gap:19px;flex:1;justify-content:center}.desktop-nav a{text-decoration:none;color:var(--title);font-size:14px;font-weight:700;white-space:nowrap;padding:22px 0 19px;border-bottom:3px solid transparent}.desktop-nav a.active,.desktop-nav a:hover{color:var(--blue);border-bottom-color:var(--cyan)}.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;text-decoration:none;white-space:nowrap;box-shadow:0 8px 18px rgba(37,182,232,.16)}.main-btn:hover{color:#fff;filter:brightness(.96)}.menu-trigger{display:none;background:transparent;border:0;padding:10px;cursor:pointer}.menu-trigger span{display:block;width:22px;height:2px;margin:4px 0;background:var(--title);border-radius:5px}.drawer-overlay{position:fixed;inset:0;background:rgba(8,26,48,.5);z-index:35;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .22s,visibility .22s}.site-drawer{position:fixed;z-index:36;top:0;bottom:0;left:0;width:min(86vw,350px);background:#fff;transform:translateX(-101%);transition:transform .24s;overflow:auto;box-shadow:var(--shadow)}.drawer-open .drawer-overlay{visibility:visible;opacity:1;pointer-events:auto}.drawer-open .site-drawer{transform:translateX(0)}.drawer-head{display:flex;justify-content:space-between;align-items:center;padding:18px 22px;font-weight:800;color:var(--title);border-bottom:1px solid var(--line)}.drawer-close{background:var(--mist);border:0;border-radius:50%;font-size:26px;color:var(--navy);width:38px;height:38px;cursor:pointer;line-height:1}.drawer-nav{padding:5px 20px 25px}.drawer-group{border-bottom:1px solid var(--line);padding:9px 0 14px}.drawer-group p{color:var(--muted);font-size:12px;letter-spacing:2px;margin:5px 0}.drawer-group a{display:block;padding:8px 10px;border-radius:8px;text-decoration:none;color:var(--title);font-weight:600}.drawer-group a.active,.drawer-group a:hover{background:var(--mist);color:var(--blue)}.eyebrow{text-transform:uppercase;letter-spacing:2px;color:#078f9b;font-size:12px;font-weight:800}.hero{margin-top:28px;padding:38px 40px;background:linear-gradient(125deg,#fff 40%,#e4f6fc 100%);border:1px solid var(--line);border-radius:24px;display:grid;grid-template-columns:1.08fr .92fr;gap:32px;align-items:center;min-height:360px}.hero h1{font-size:39px;line-height:1.33;color:var(--title);letter-spacing:-.5px;margin:12px 0 20px}.hero p{max-width:550px;margin:0 0 22px;font-size:17px}.hero-actions{display:flex;gap:13px;flex-wrap:wrap}.outline-btn{display:inline-flex;padding:8px 19px;border:1px solid #abdce9;border-radius:999px;color:var(--navy);font-weight:700;text-decoration:none;background:#fff}.hero .media{height:275px}.media{display:flex;align-items:center;justify-content:center;overflow:hidden;background:var(--mist);border:1px solid var(--line);border-radius:15px;position:relative;min-height:170px}.media img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.media-placeholder{flex-direction:column;gap:14px;background:radial-gradient(circle at 30% 20%,#dffaff,#eaf7fc 55%,#dceefb)}.placeholder-art{display:flex;gap:7px;align-items:end;height:68px;opacity:.75}.placeholder-art i{display:block;width:28px;border-radius:8px;background:linear-gradient(160deg,#25c8d1,#1787db);transform:skew(-12deg)}.placeholder-art i:nth-child(1){height:40px}.placeholder-art i:nth-child(2){height:65px}.placeholder-art i:nth-child(3){height:51px}.placeholder-label{font-size:13px;font-weight:700;color:var(--navy);padding:0 15px;text-align:center}.section{margin-block:43px}.section-head{display:flex;align-items:end;justify-content:space-between;gap:20px;margin:0 0 22px}.section h2,.related h2{font-size:26px;line-height:1.4;color:var(--title);margin:0 0 12px}.section-head h2{margin-bottom:3px}.section-lead{color:var(--muted);max-width:740px;margin:0}.text-link{font-weight:700;white-space:nowrap}.feature-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:22px}.card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px;box-shadow:var(--shadow)}.card h3{color:var(--title);font-size:19px;margin:8px 0}.card p{margin:8px 0 15px}.card a{font-weight:700}.card .media{height:190px;margin-bottom:14px}.topic-list{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.topic{padding:24px;border-radius:16px;border:1px solid var(--line);background:#fff;text-decoration:none;color:var(--text);transition:transform .2s,border-color .2s}.topic:hover{transform:translateY(-4px);border-color:var(--cyan)}.topic strong{display:block;font-size:19px;color:var(--title);margin:8px 0}.topic p{font-size:14px;color:var(--muted);margin:0}.topic-index{font-weight:800;color:#0aa8bf;letter-spacing:2px;font-size:13px}.split{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:center}.split .media{height:260px}.article-index{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.article-index a{background:#fff;border:1px solid var(--line);border-radius:12px;padding:15px 19px;color:var(--title);text-decoration:none;font-weight:700}.article-index a:hover{border-color:var(--cyan)}.notice{border-left:4px solid var(--cyan);background:var(--mist);padding:19px 24px;border-radius:0 12px 12px 0}.page-hero{background:linear-gradient(115deg,#eaf9fc,#fff);padding:42px 0 38px;border-bottom:1px solid var(--line)}.page-hero h1{color:var(--title);font-size:33px;line-height:1.35;margin:8px 0 15px}.page-hero p{max-width:790px;margin:0;color:var(--text);font-size:17px}.crumb{font-size:13px;color:var(--muted)}.crumb a{text-decoration:none}.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:45px;align-items:start;margin-top:35px}.prose{max-width:820px}.prose h2{color:var(--title);font-size:25px;line-height:1.4;margin:34px 0 13px}.prose h3{color:var(--navy);font-size:19px;margin:23px 0 10px}.prose p{margin:0 0 17px}.prose ul,.prose ol{padding-left:24px;margin:0 0 24px}.prose li{margin:6px 0}.prose .media{height:290px;margin:24px 0}.side-panel{position:sticky;top:100px;padding:23px;background:#fff;border:1px solid var(--line);border-radius:16px}.side-panel h2{font-size:17px;color:var(--title);margin:0 0 12px}.side-panel a{display:block;padding:9px 0;border-bottom:1px solid var(--line);text-decoration:none;font-size:14px}.side-panel a:last-child{border-bottom:0}.comparison{display:grid;grid-template-columns:1fr 1fr;gap:18px}.comparison>div{padding:22px;background:#fff;border:1px solid var(--line);border-radius:14px}.comparison h3{margin:0 0 10px;color:var(--title)}.data-table{border-collapse:collapse;width:100%;font-size:15px;background:#fff;margin:18px 0 28px}.data-table th,.data-table td{border:1px solid var(--line);padding:12px 14px;text-align:left;vertical-align:top}.data-table th{background:var(--mist);color:var(--title)}.steps{counter-reset:step;list-style:none!important;padding:0!important}.steps li{counter-increment:step;position:relative;padding:16px 20px 16px 60px;margin-bottom:12px!important;background:#fff;border:1px solid var(--line);border-radius:13px}.steps li:before{content:counter(step);position:absolute;left:16px;top:14px;display:grid;place-items:center;width:31px;height:31px;border-radius:50%;background:var(--mist);color:var(--blue);font-weight:800}.quote-strip{font-size:18px;font-weight:700;color:var(--navy);background:var(--mist);padding:24px;border-radius:15px;margin:25px 0}.gallery-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}.gallery-item{background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px}.gallery-item .media{height:225px}.gallery-item h3{font-size:19px;color:var(--title);margin:14px 5px 4px}.gallery-item p{font-size:14px;margin:0 5px 8px}.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;margin:10px 0;padding:14px 18px}.faq summary{font-weight:700;color:var(--title);cursor:pointer}.faq details p{margin:11px 0 0}.related{margin-top:38px;margin-bottom:44px;padding:25px;background:#eaf7fc;border-radius:16px}.related-links{display:flex;flex-wrap:wrap;gap:10px}.related-link{padding:7px 16px;border:1px solid #b8dbe8;border-radius:999px;text-decoration:none;background:#fff;font-weight:700}.site-footer{background:#123653;color:#eaf7ff;margin-top:65px;padding:48px 0 22px}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:60px}.site-footer p{font-size:14px;max-width:410px}.footer-brand{color:#fff;text-decoration:none;font-size:23px;font-weight:800}.footer-brand small{display:block;font-size:10px;letter-spacing:2px;font-weight:400}.site-footer h2{font-size:16px;margin:0 0 15px;color:#fff}.footer-links{display:grid;gap:6px}.footer-links a{color:#eaf7ff;text-decoration:none;font-size:14px}.footer-links a:hover{color:#8ee8ff}.footer-muted{opacity:.7}.footer-bottom{border-top:1px solid rgba(255,255,255,.15);margin-top:28px;padding-top:16px;display:flex;justify-content:space-between;gap:20px;font-size:12px;color:#b8d6e8}.bottom-nav{display:none}.back-top{position:fixed;right:20px;bottom:24px;width:42px;height:42px;border:0;border-radius:50%;background:var(--navy);color:#fff;box-shadow:var(--shadow);cursor:pointer;opacity:0;visibility:hidden;transition:.2s;z-index:20}.back-top.visible{opacity:1;visibility:visible}@media(max-width:1100px){.desktop-nav{gap:12px}.desktop-nav a{font-size:13px}.head-inner{gap:12px}.head-action{padding:0 15px}}@media(max-width:980px){.head-inner{height:60px;justify-content:space-between}.menu-trigger{display:block}.brand{position:absolute;left:50%;transform:translateX(-50%)}.brand img{height:29px;max-width:135px}.brand-sign{height:32px;width:32px;font-size:21px;line-height:32px}.brand-words strong{font-size:14px}.brand-words small{font-size:7px}.desktop-nav{display:none}.head-action{height:38px;font-size:13px;min-width:0;padding:0 13px;margin-left:auto}.site-footer{padding-bottom:88px}.bottom-nav{position:fixed;z-index:29;bottom:0;left:0;right:0;display:grid;grid-template-columns:repeat(4,1fr);background:#fff;box-shadow:0 -6px 25px rgba(23,75,120,.12);padding-bottom:env(safe-area-inset-bottom)}.bottom-nav a{text-align:center;padding:10px 0 8px;color:var(--title);font-size:13px;font-weight:700;text-decoration:none}.bottom-nav a[aria-current=page]{color:var(--blue)}.back-top{bottom:74px}.article-layout{grid-template-columns:1fr;gap:20px}.side-panel{position:static;display:none}}@media(max-width:700px){body{font-size:15px;line-height:1.78}.wrap{width:calc(100% - 32px)}.hero{grid-template-columns:1fr;padding:25px 21px;gap:20px;margin-top:16px}.hero .media{grid-row:1;height:195px}.hero h1{font-size:29px}.hero p,.page-hero p{font-size:15px}.section{margin-block:30px}.section h2,.related h2{font-size:22px}.section-head{align-items:start}.feature-grid,.split,.comparison,.gallery-grid,.article-index{grid-template-columns:1fr}.topic-list{grid-template-columns:repeat(2,1fr);gap:12px}.topic{padding:17px}.topic strong{font-size:17px}.split .media{height:210px}.page-hero{padding:28px 0}.page-hero h1{font-size:27px}.prose h2{font-size:21px}.prose h3{font-size:18px}.prose .media{height:205px}.card{padding:19px}.footer-grid{grid-template-columns:1fr 1fr;gap:30px}.footer-grid>div:first-child{grid-column:1/-1}.footer-bottom{display:block}.gallery-item .media{height:190px}.data-table{font-size:13px}.data-table th,.data-table td{padding:9px 8px}}@media(max-width:375px){.brand-words small{display:none}.brand-words strong{font-size:13px}.head-action{padding:0 10px}.topic-list{grid-template-columns:1fr}.hero h1{font-size:27px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}