:root{--bg:#f5fbff;--white:#fff;--light:#eaf7fc;--cyan:#25c8d1;--sky:#25b6e8;--blue:#1787db;--ocean:#174b78;--heading:#173b60;--ink:#2d4359;--muted:#687f93;--border:#dcebf3;--footer:#123653;--shadow:0 12px 40px rgba(23,75,120,.07)}
*,*::before,*::after{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:95px}body{margin:0;font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);font-size:16px;line-height:1.8}body.drawer-open{overflow:hidden}a{color:inherit;text-decoration:none}a:hover{color:var(--blue)}a:focus-visible,button:focus-visible{outline:3px solid var(--blue);outline-offset:3px}button{font:inherit;cursor:pointer}img{max-width:100%}.shell{width:min(1160px,calc(100% - 48px));margin-inline:auto}.skip-link{position:absolute;left:16px;top:-60px;z-index:100;background:#fff;padding:8px 16px}.skip-link:focus{top:8px}.site-header{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.98);border-bottom:1px solid var(--border);box-shadow:0 4px 26px rgba(23,75,120,.04)}.header-inner{height:72px;display:flex;align-items:center;gap:26px}.brand{display:flex;align-items:center;flex-shrink:0;min-width:148px}.brand-image{display:block;max-width:172px;width:auto;height:36px;object-fit:contain}.brand-fallback{font-size:19px;font-weight:900;letter-spacing:-.7px;color:var(--blue);white-space:nowrap}.brand-fallback span{color:var(--cyan)}.desktop-nav{display:flex;align-items:center;justify-content:center;gap:clamp(9px,1.5vw,23px);margin-left:auto}.desktop-nav a{font-size:14px;font-weight:650;white-space:nowrap;color:var(--heading);padding:23px 0 19px;border-bottom:3px solid transparent}.desktop-nav a:hover,.desktop-nav .active{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 6px 15px rgba(37,182,232,.18)}.main-btn:hover{color:#fff;filter:brightness(.96)}.top-entry{font-size:14px;margin-left:5px}.menu-toggle{display:none;width:40px;height:40px;border:0;background:transparent;padding:10px;flex-direction:column;justify-content:center;gap:5px}.menu-toggle span{height:2px;width:22px;background:var(--heading);border-radius:2px}.drawer-overlay{position:fixed;inset:0;z-index:39;background:rgba(9,30,50,.52);opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s,visibility .2s}.mobile-drawer{position:fixed;inset:0 auto 0 0;width:min(86vw,340px);z-index:40;overflow-y:auto;background:#fff;box-shadow:var(--shadow);transform:translateX(-103%);visibility:hidden;pointer-events:none;transition:transform .25s,visibility .25s;padding:22px 22px 38px}.drawer-open .drawer-overlay{opacity:1;visibility:visible;pointer-events:auto}.drawer-open .mobile-drawer{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-head{display:flex;justify-content:space-between;align-items:center;padding-bottom:18px;border-bottom:1px solid var(--border)}.drawer-logo{height:32px;width:auto;max-width:175px;object-fit:contain}.drawer-close{background:var(--light);color:var(--heading);border:0;width:40px;height:40px;border-radius:50%;font-size:27px;line-height:1}.mobile-drawer nav{display:grid;gap:1px}.mobile-drawer nav a{padding:10px 12px;border-radius:8px;color:var(--heading);font-weight:600}.mobile-drawer nav a:hover{background:var(--light)}.drawer-group{margin:19px 0 5px;color:var(--blue);font-size:12px;font-weight:800;letter-spacing:.12em}.drawer-note{font-size:13px;color:var(--muted);margin-top:30px}.eyebrow,.kicker{font-weight:800;font-size:12px;color:#1686b3;letter-spacing:.12em;text-transform:uppercase}.page-head{padding:56px 0 35px}.page-head .kicker{margin:0 0 12px}.page-head h1,.hero h1{font-size:clamp(30px,3.4vw,40px);line-height:1.34;letter-spacing:-.035em;color:var(--heading);margin:0 0 18px;font-weight:850}.page-head p{max-width:760px;margin:0;color:#4a6680}.breadcrumbs{font-size:13px;color:var(--muted);margin-bottom:22px}.breadcrumbs a{color:var(--blue)}.hero{padding:56px 0 40px;position:relative}.hero-grid{display:grid;grid-template-columns:1.13fr 1fr;gap:42px;align-items:center}.hero h1{font-size:clamp(32px,3.6vw,40px)}.hero p{font-size:17px;max-width:560px;margin:0 0 24px;color:#4c6982}.hero-actions{display:flex;flex-wrap:wrap;gap:11px;align-items:center}.text-btn{display:inline-flex;align-items:center;justify-content:center;padding:8px 12px;color:var(--ocean);font-weight:700;border-bottom:1px solid var(--cyan)}.hero-stat{display:flex;flex-wrap:wrap;gap:12px 20px;margin-top:27px;color:var(--muted);font-size:13px}.hero-stat span::before{content:'•';color:var(--cyan);margin-right:8px}.media{width:100%;display:flex;align-items:center;justify-content:center;min-height:175px;background:#eaf7fc;border:1px solid #daedf5;border-radius:18px;overflow:hidden;position:relative}.media--hero{aspect-ratio:1.48}.media--landscape{aspect-ratio:1.72}.media--wide{aspect-ratio:2.3}.media--square{aspect-ratio:1}.media--portrait{aspect-ratio:3 / 4;max-width:360px;margin:auto}.media img{display:block;max-height:100%;max-width:100%;width:auto;height:auto;object-fit:contain;object-position:center}.media-placeholder{display:flex;align-items:end;justify-content:center;gap:12px;transform:rotate(-8deg);opacity:.48}.media-placeholder i{display:block;width:34px;border-radius:24px 24px 8px 8px;background:linear-gradient(180deg,#25c8d1,#1787db);height:78px}.media-placeholder i:nth-child(2){height:115px}.media-placeholder i:nth-child(3){height:61px}.media--hero .media-placeholder i{width:45px;height:110px}.media--hero .media-placeholder i:nth-child(2){height:157px}.section{padding:34px 0 44px}.section--alt{background:linear-gradient(180deg,#eaf7fc 0%,#f5fbff 100%);border-block:1px solid var(--border)}.section-header{display:flex;justify-content:space-between;gap:20px;align-items:end;margin-bottom:24px}.section-header h2{font-size:26px;line-height:1.4;color:var(--heading);margin:6px 0}.section-header p{margin:0;max-width:650px;color:var(--muted)}.section-header>a{font-size:14px;font-weight:700;color:var(--blue);white-space:nowrap}.columns-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.columns-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.link-card,.panel,.story-card,.feature-panel,.reading-panel{background:#fff;border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow)}.link-card{position:relative;display:flex;flex-direction:column;gap:10px;padding:24px;transition:transform .2s,border-color .2s;min-height:190px}.link-card:hover{transform:translateY(-3px);border-color:#9cdaed}.link-card strong{font-size:19px;line-height:1.35;color:var(--heading)}.link-card>span:not(.eyebrow):not(.link-arrow){font-size:14px;color:var(--muted);line-height:1.7}.link-arrow{position:absolute;right:22px;top:18px;color:var(--blue);font-size:21px}.panel{padding:26px}.panel h3,.story-card h3{color:var(--heading);margin:0 0 11px;font-size:20px;line-height:1.45}.panel p,.story-card p{margin:0;color:var(--ink)}.panel p+p,.article-body p+p{margin-top:13px}.small-label{font-size:12px;font-weight:800;color:var(--blue);letter-spacing:.1em}.topic-list{padding:0;list-style:none;margin:0;display:grid}.topic-list li{border-top:1px solid var(--border);padding:16px 0}.topic-list li:first-child{border-top:0}.topic-list a{font-weight:700;color:var(--heading)}.topic-list small{display:block;margin-top:4px;font-size:13px;color:var(--muted)}.story-card{overflow:hidden}.story-card .card-text{padding:21px}.story-card h3{font-size:19px}.story-card p{font-size:14px;line-height:1.75}.split{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:center}.split--wide{grid-template-columns:1.3fr .8fr}.split>div>h2{color:var(--heading);font-size:25px;line-height:1.4;margin:0 0 14px}.split>div>p{margin:0 0 15px}.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:46px;align-items:start;padding-bottom:52px}.article-body{max-width:820px}.article-body h2{color:var(--heading);font-size:25px;line-height:1.4;margin:35px 0 14px}.article-body h2:first-child{margin-top:0}.article-body h3{color:var(--heading);font-size:19px;margin:25px 0 10px}.article-body p{line-height:1.86;margin:0 0 12px}.article-body ul,.article-body ol{padding-left:24px}.article-body li{padding:4px 0}.aside-panel{background:#fff;border-radius:15px;border:1px solid var(--border);padding:22px;position:sticky;top:100px}.aside-panel h2{font-size:17px;color:var(--heading);margin:0 0 12px}.aside-panel a{display:block;padding:10px 0;border-bottom:1px solid var(--border);font-size:14px;color:var(--ocean)}.aside-panel a:last-child{border:0}.quote-panel{padding:24px 28px;margin:25px 0;border-left:4px solid var(--cyan);background:var(--light);border-radius:0 12px 12px 0;color:var(--heading);font-weight:700}.comparison{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:22px 0}.comparison .panel{box-shadow:none}.comparison .panel h3{font-size:19px}.text-table{width:100%;border-collapse:collapse;margin:20px 0 28px;background:white;border-radius:12px;overflow:hidden;font-size:15px}.text-table th,.text-table td{text-align:left;vertical-align:top;padding:13px 15px;border:1px solid var(--border)}.text-table th{background:#eaf7fc;color:var(--heading)}.timeline{display:grid;gap:17px;counter-reset:time}.timeline-item{display:grid;grid-template-columns:46px 1fr;gap:18px;align-items:start;padding-bottom:18px;border-bottom:1px solid var(--border)}.timeline-item::before{counter-increment:time;content:counter(time,decimal-leading-zero);border-radius:50%;display:grid;place-items:center;width:42px;height:42px;color:#fff;background:var(--blue);font-weight:800;font-size:13px}.timeline-item h3{margin:0 0 7px;color:var(--heading)}.timeline-item p{margin:0}.tag-list{display:flex;flex-wrap:wrap;gap:9px;margin:22px 0}.tag-list span{display:inline-block;padding:6px 12px;background:var(--light);color:var(--ocean);border-radius:100px;font-size:13px;font-weight:700}.reading-panel{padding:25px}.reading-panel h2{font-size:23px;color:var(--heading);margin:0 0 18px}.reading-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.reading-grid a{border:1px solid var(--border);border-radius:12px;padding:14px;font-weight:700;color:var(--ocean);font-size:14px}.reading-grid a:hover{background:var(--light)}.faq{display:grid;gap:12px}.faq details{border:1px solid var(--border);background:#fff;border-radius:12px;padding:17px 20px}.faq summary{cursor:pointer;font-weight:750;color:var(--heading)}.faq details p{margin:11px 0 0}.footer-grid{display:grid;grid-template-columns:1.5fr 1fr .9fr;gap:55px;padding:45px 0 36px}.site-footer{background:var(--footer);color:#eaf7ff}.footer-logo{max-width:160px;height:35px;object-fit:contain}.footer-brand .brand-fallback{color:#fff}.footer-intro p{max-width:340px;font-size:14px;line-height:1.8;color:#c5e1f0;margin:12px 0}.footer-grid h2{font-size:15px;margin:3px 0 13px}.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:7px 16px}.footer-links a{color:#d8eef9;font-size:14px}.footer-links a:hover{color:#fff;text-decoration:underline}.footer-bottom{border-top:1px solid rgba(255,255,255,.16);display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;padding:18px 0 26px;font-size:12px;color:#b9d5e4}.mobile-bottom{display:none}.back-top{position:fixed;right:25px;bottom:25px;width:42px;height:42px;border:0;border-radius:50%;background:var(--ocean);color:#fff;z-index:25;box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:opacity .15s}.back-top.visible{opacity:1;pointer-events:auto}
@media(max-width:1100px){.desktop-nav{gap:10px}.brand{min-width:122px}.brand-image{max-width:135px}.top-entry{padding:0 14px}.header-inner{gap:15px}}
@media(max-width:980px){.desktop-nav{display:none}.menu-toggle{display:flex;flex-shrink:0}.header-inner{height:60px;justify-content:space-between}.brand{position:absolute;left:50%;transform:translateX(-50%);justify-content:center;min-width:0}.brand-image{height:29px;max-width:142px}.top-entry{height:40px;margin-left:auto;padding:0 12px;font-size:13px}.hero-grid{gap:25px}.article-layout{grid-template-columns:1fr}.aside-panel{position:static}.columns-3{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-grid{gap:22px}}
@media(max-width:640px){body{font-size:15px}.shell{width:calc(100% - 32px)}.hero{padding:33px 0 20px}.hero-grid{grid-template-columns:1fr;gap:22px}.hero-grid .hero-copy{order:2}.hero-grid .hero-visual{order:1}.hero h1{font-size:29px}.hero p{font-size:15px}.hero-stat{margin-top:18px}.page-head{padding:31px 0 23px}.page-head h1{font-size:27px}.section{padding:26px 0 32px}.section-header{align-items:start;flex-direction:column;gap:7px;margin-bottom:18px}.section-header h2{font-size:22px}.columns-3,.columns-2,.split,.split--wide,.comparison{grid-template-columns:1fr}.split{gap:19px}.split>div>h2{font-size:22px}.panel{padding:21px}.link-card{min-height:160px}.article-layout{gap:22px;padding-bottom:35px}.article-body h2{font-size:21px;margin-top:27px}.article-body h3{font-size:18px}.reading-grid{grid-template-columns:1fr}.text-table{font-size:13px}.text-table th,.text-table td{padding:9px}.footer-grid{grid-template-columns:1fr 1fr;gap:27px;padding:35px 0 26px}.footer-intro{grid-column:1/-1}.footer-bottom{display:block;padding-bottom:78px}.footer-bottom span{display:block;margin-bottom:6px}.mobile-bottom{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;bottom:0;left:0;right:0;z-index:29;background:#fff;border-top:1px solid var(--border);padding:7px 0 max(6px,env(safe-area-inset-bottom));box-shadow:0 -2px 20px rgba(23,75,120,.07)}.mobile-bottom a{display:flex;flex-direction:column;text-align:center;align-items:center;justify-content:center;gap:0;color:var(--ocean);font-size:19px;line-height:1.2}.mobile-bottom a span{font-size:11px;margin-top:3px}.mobile-bottom a[aria-current=page]{color:var(--blue)}.back-top{bottom:79px;right:14px;width:38px;height:38px}.media--hero{aspect-ratio:1.7}.media--portrait{max-width:280px}.timeline-item{gap:12px}.quote-panel{padding:19px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important}}