:root{--bg:#f5fbff;--surface:#fff;--soft:#eaf7fc;--cyan:#25c8d1;--sky:#25b6e8;--blue:#1787db;--navy:#174b78;--heading:#173b60;--text:#2d4359;--muted:#687f93;--line:#dcebf3;--footer:#123653;--radius:18px;--shadow:0 18px 45px rgba(23,75,120,.075)}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:90px}body{margin:0;background:var(--bg);font-family:Arial,'PingFang SC','Microsoft YaHei',sans-serif;color:var(--text);font-size:16px;line-height:1.8}a{color:inherit;text-decoration:none}a:hover{color:var(--blue)}button{font:inherit}img{max-width:100%}.wrap{width:min(1160px,calc(100% - 48px));margin-inline:auto}.skip-link{position:absolute;z-index:1000;top:-100px;left:15px;background:white;padding:10px 20px}.skip-link:focus{top:10px}.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.98);border-bottom:1px solid var(--line);box-shadow:0 4px 22px rgba(23,75,120,.025)}.header-inner{height:72px;display:flex;align-items:center;gap:24px}.brand{display:flex;align-items:center;gap:10px;flex:none;color:var(--heading)}.brand-image{width:auto!important;height:39px!important;max-width:85px;min-width:38px;background:transparent!important;border-radius:0!important}.brand-image img{max-height:39px}.brand-image.media-placeholder{font-size:0;min-width:36px;width:36px!important;background:linear-gradient(145deg,#25c8d1,#1787db)!important;border-radius:10px!important}.brand-image.media-placeholder .placeholder-mark{font-size:25px;color:white}.brand-text{display:flex;flex-direction:column;line-height:1.18;white-space:nowrap}.brand-text strong{font-size:19px;letter-spacing:1px}.brand-text small{font-size:9px;color:#358bb3;letter-spacing:2px;margin-top:4px}.desktop-nav{display:flex;align-items:center;justify-content:center;gap:20px;flex:1}.desktop-nav a{font-size:14px;font-weight:600;white-space:nowrap;position:relative;padding:25px 0;color:#35556e}.desktop-nav a.active{color:#1787db}.desktop-nav a.active:after{content:'';position:absolute;bottom:0;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!important;font-weight:700;text-decoration:none;white-space:nowrap;box-shadow:0 8px 20px #1787db22}.main-btn:hover{filter:brightness(.95);transform:translateY(-1px)}.header-cta{font-size:14px}.menu-toggle{display:none;width:42px;height:42px;border:1px solid var(--line);border-radius:12px;background:white;align-items:center;justify-content:center;flex-direction:column;gap:5px;cursor:pointer}.menu-toggle span{display:block;width:19px;height:2px;border-radius:2px;background:var(--heading)}.drawer-overlay{position:fixed;inset:0;background:rgba(13,39,65,.44);z-index:70;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s,visibility .2s}.mobile-drawer{position:fixed;top:0;bottom:0;left:0;width:min(86vw,340px);overflow-y:auto;background:white;z-index:71;transform:translateX(-105%);visibility:hidden;transition:transform .24s,visibility .24s;box-shadow:10px 0 40px #10355122}.drawer-open .drawer-overlay{opacity:1;visibility:visible;pointer-events:auto}.drawer-open .mobile-drawer{transform:translateX(0);visibility:visible}.drawer-head{display:flex;align-items:center;justify-content:space-between;padding:18px 22px;border-bottom:1px solid var(--line);font-weight:700;color:var(--heading)}.drawer-close{border:0;background:var(--soft);width:35px;height:35px;border-radius:10px;cursor:pointer}.drawer-brand{padding:22px;color:var(--heading);font-weight:800;font-size:23px}.drawer-brand small{display:block;font-size:10px;font-weight:500;letter-spacing:3px;color:var(--muted)}.drawer-label{font-size:12px;font-weight:700;color:#159baa;background:#ecfaff;padding:5px 22px;margin-top:12px}.mobile-drawer nav a{display:block;padding:11px 22px;border-bottom:1px solid #edf4f8;font-size:15px}.eyebrow,.section-label{font-size:12px;letter-spacing:2.4px;text-transform:uppercase;font-weight:800;color:#079db3}.page-top{padding:60px 0 34px}.page-top .eyebrow{margin-bottom:12px}.page-top h1{font-size:34px;line-height:1.4;margin:0 0 16px;color:var(--heading)}.page-top p{max-width:780px;font-size:17px;line-height:1.85;margin:0;color:var(--muted)}.hero{position:relative;padding:62px 0 48px;overflow:hidden;background:radial-gradient(circle at 90% 5%,#cff6fb 0,transparent 43%),linear-gradient(145deg,#f6fcff,#e8f7fd)}.hero-grid{display:grid;grid-template-columns:1.06fr .94fr;align-items:center;gap:48px}.hero .eyebrow{margin-bottom:16px}.hero h1{font-size:40px;line-height:1.35;color:var(--heading);margin:0 0 20px;letter-spacing:-1px}.hero h1 em{font-style:normal;color:var(--blue)}.hero p{font-size:17px;color:#46657b;max-width:560px;margin:0 0 26px}.hero-actions{display:flex;align-items:center;gap:20px;flex-wrap:wrap}.text-link{font-weight:700;color:var(--navy);border-bottom:1px solid #8bcce3}.hero-facts{display:flex;gap:22px;margin-top:34px;padding-top:20px;border-top:1px solid #cce7f4;color:var(--muted);font-size:13px}.hero-facts span{display:block}.hero-facts strong{display:block;color:var(--heading);font-size:20px;line-height:1.3}.media{display:flex;justify-content:center;align-items:center;width:100%;overflow:hidden;background:var(--soft);border-radius:14px}.media img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.media-placeholder{min-height:190px;flex-direction:column;gap:6px;border:1px solid #b9e8f3;color:#438aab;background:linear-gradient(135deg,#e9fbff,#d7f1fb);font-size:14px;text-align:center;padding:16px}.placeholder-mark{font-size:45px;color:#26acc8;line-height:1.2}.hero-image{height:340px;border-radius:28px;box-shadow:var(--shadow);background:linear-gradient(140deg,#e7fbff,#cceaf8)}.hero-image img{max-height:100%}.section{padding:46px 0}.section-heading{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:24px}.section-heading h2,.related-section h2{font-size:27px;line-height:1.4;color:var(--heading);margin:7px 0 0}.section-heading p{max-width:500px;color:var(--muted);margin:0}.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.topic-card{display:flex;flex-direction:column;gap:10px;background:white;border:1px solid var(--line);border-radius:var(--radius);padding:25px;box-shadow:0 8px 24px #144f8010;transition:transform .2s,border-color .2s}.topic-card:hover{transform:translateY(-4px);border-color:#80d2e8}.topic-number{font-size:12px;font-weight:800;color:#19b6c7;letter-spacing:2px}.topic-card h3{margin:0;color:var(--heading);font-size:20px;line-height:1.4}.topic-card p{margin:0;color:var(--muted);font-size:15px;flex:1}.card-arrow{margin-top:4px;color:var(--blue);font-size:14px;font-weight:700}.feature-panel{display:grid;grid-template-columns:1fr 1fr;gap:34px;align-items:center;padding:28px;border-radius:24px;background:white;border:1px solid var(--line)}.feature-panel.flip .feature-media{order:-1}.feature-panel h2{font-size:27px;color:var(--heading);margin:8px 0 14px}.feature-panel p{color:var(--muted);margin-bottom:18px}.feature-panel .media{height:260px}.pill-list{display:flex;gap:9px;flex-wrap:wrap;margin-top:18px}.pill-list span{font-size:12px;color:var(--navy);border:1px solid #cbe8f3;padding:5px 12px;background:#f0fbff;border-radius:999px}.link-articles{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.link-articles a{display:flex;justify-content:space-between;gap:12px;background:white;padding:18px 22px;border:1px solid var(--line);border-radius:12px;font-size:15px;font-weight:700;color:var(--heading)}.link-articles a:hover{border-color:var(--cyan)}.article-shell{display:grid;grid-template-columns:minmax(0,820px) 250px;align-items:start;gap:48px;padding:22px 0 58px}.article-body{min-width:0}.article-body>section,.article-body>article{margin-bottom:38px}.article-body h2{color:var(--heading);font-size:25px;line-height:1.4;margin:0 0 18px}.article-body h3{color:var(--heading);font-size:19px;margin:22px 0 8px}.article-body p{margin:0 0 16px}.article-body ul,.article-body ol{padding-left:23px}.article-body li{margin:8px 0}.article-body .media{height:260px;margin:18px 0 23px}.side-index{position:sticky;top:110px;background:#eaf7fc;border:1px solid var(--line);border-radius:16px;padding:22px}.side-index h2{font-size:16px;margin:0 0 12px;color:var(--heading)}.side-index a{display:block;font-size:14px;padding:9px 0;border-top:1px solid #d8eaf3;color:#406077}.quote-panel{padding:24px 28px;background:linear-gradient(110deg,#e9faff,#f6fcff);border-left:4px solid var(--cyan);border-radius:0 14px 14px 0;color:var(--navy);font-size:18px;font-weight:600;margin:22px 0}.info-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin:22px 0}.info-box{background:white;border:1px solid var(--line);border-radius:14px;padding:22px}.info-box h3{margin:0 0 10px;font-size:18px}.info-box p{margin:0;font-size:15px}.data-table{width:100%;border-collapse:collapse;background:white;margin:20px 0 25px;font-size:15px}.data-table th{background:#e0f5fc;color:var(--heading);text-align:left}.data-table th,.data-table td{padding:13px 15px;border:1px solid #d3e8f1;vertical-align:top}.article-kicker{font-size:13px;color:#1a9caf;font-weight:700;letter-spacing:1px}.steps{counter-reset:steps;display:grid;gap:13px;padding:0;list-style:none!important}.steps li{counter-increment:steps;background:white;border:1px solid var(--line);border-radius:14px;padding:18px 20px 18px 64px;position:relative;margin:0!important}.steps li:before{content:counter(steps,decimal-leading-zero);position:absolute;left:20px;top:17px;font-weight:800;color:var(--blue)}.related-section{padding:28px 0 45px;border-top:1px solid var(--line)}.related-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:19px}.related-links a{display:flex;justify-content:space-between;gap:10px;background:white;border:1px solid var(--line);border-radius:12px;padding:14px 16px;font-weight:700;color:var(--heading);font-size:14px}.related-links span{color:var(--blue)}.notice{background:#e8f8ff;border:1px solid #bce8f4;padding:18px 22px;border-radius:14px;font-size:14px;color:#37647d}.faq-list details{background:white;border:1px solid var(--line);border-radius:12px;padding:16px 20px;margin-bottom:10px}.faq-list summary{cursor:pointer;font-weight:700;color:var(--heading)}.faq-list p{margin:13px 0 0;font-size:15px}.site-footer{margin-top:30px;background:var(--footer);color:#eaf7ff;padding:55px 0 16px}.footer-layout{display:grid;grid-template-columns:2fr 1fr 1fr;gap:50px}.footer-logo{font-weight:800;font-size:25px;color:white}.footer-logo span{font-size:10px;font-weight:400;letter-spacing:2px;display:block}.footer-about p{font-size:14px;color:#c9e2f3;max-width:445px}.footer-about .footer-note{font-size:12px;color:#a8c9db}.footer-layout h3{font-size:16px;margin:5px 0 20px;color:white}.footer-layout>div>a:not(.footer-logo){display:block;font-size:14px;color:#c9e2f3;margin:10px 0}.footer-bottom{border-top:1px solid #ffffff20;margin-top:30px;padding-top:18px;display:flex;justify-content:space-between;gap:15px;font-size:12px;color:#a8c9db}.footer-bottom a{color:#eaf7ff}.bottom-nav{display:none}@media(max-width:1100px){.desktop-nav{gap:12px}.desktop-nav a{font-size:13px}.header-inner{gap:14px}.brand-text strong{font-size:17px}}@media(max-width:980px){.desktop-nav{display:none}.menu-toggle{display:flex}.header-inner{justify-content:space-between;height:60px;position:relative}.brand{position:absolute;left:50%;transform:translateX(-50%)}.brand-image{height:30px!important;max-height:30px}.brand-image img{max-height:30px}.brand-text strong{font-size:16px}.brand-text small{font-size:8px;letter-spacing:1px}.header-cta{height:39px;padding:0 13px;font-size:13px}.article-shell{grid-template-columns:1fr}.side-index{position:static;display:none}.hero-grid{gap:24px}.hero h1{font-size:34px}}@media(max-width:680px){body{font-size:15px;line-height:1.78}.wrap{width:calc(100% - 32px)}.header-inner{height:60px}.brand-text{display:none}.brand-image{min-width:70px!important;max-width:105px}.brand-image.media-placeholder{min-width:38px!important}.hero{padding:32px 0}.hero-grid{grid-template-columns:1fr;gap:18px}.hero-grid .hero-image{grid-row:1;height:204px;border-radius:17px}.hero h1{font-size:29px;margin-bottom:14px}.hero p{font-size:15px}.hero-facts{gap:16px}.hero-facts strong{font-size:17px}.section{padding:28px 0}.section-heading{display:block;margin-bottom:18px}.section-heading h2,.related-section h2{font-size:22px}.section-heading p{margin-top:10px;font-size:14px}.grid-3,.grid-2,.link-articles,.related-links,.info-grid{grid-template-columns:1fr}.topic-card{padding:21px}.topic-card h3{font-size:18px}.feature-panel{grid-template-columns:1fr;padding:18px;gap:15px}.feature-panel .feature-media{order:-1}.feature-panel .media{height:185px}.feature-panel h2{font-size:22px}.page-top{padding:32px 0 22px}.page-top h1{font-size:27px}.page-top p{font-size:15px}.article-shell{padding:12px 0 40px}.article-body h2{font-size:21px}.article-body h3{font-size:18px}.article-body .media{height:194px}.data-table{font-size:13px}.data-table th,.data-table td{padding:10px 8px}.quote-panel{font-size:16px;padding:17px}.footer-layout{grid-template-columns:1fr 1fr;gap:25px}.footer-about{grid-column:1/-1}.site-footer{padding:36px 0 90px}.footer-bottom{display:block}.footer-bottom a{display:block;margin-top:5px}.bottom-nav{position:fixed;bottom:0;left:0;right:0;z-index:49;display:grid;grid-template-columns:repeat(4,1fr);padding:5px 0 max(7px,env(safe-area-inset-bottom));background:#fff;box-shadow:0 -5px 24px #174b7819;border-top:1px solid var(--line)}.bottom-nav a{text-align:center;font-size:18px;color:#52758c;line-height:1.25}.bottom-nav small{display:block;font-size:11px}.bottom-nav a.active{color:#159fca}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important}}