:root{--base:#F6FAFC;--surface:#fff;--pale:#EAF6FA;--pale2:#EDF4F8;--cyan:#25C8D1;--sky:#25B6E8;--blue:#1787DB;--navy:#174B78;--heading:#183A56;--body:#31485D;--muted:#687D8E;--line:#DCE9F0;--foot:#123653;--max:1180px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:36px}body{margin:0;background:var(--base);color:var(--body);font:16px/1.8 Arial,'PingFang SC','Microsoft YaHei',sans-serif}body.drawer-open{overflow:hidden}a{color:var(--navy);text-underline-offset:4px}a:hover{color:var(--blue)}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(calc(100% - 56px),var(--max));margin-inline:auto}.site-header{background:white;position:relative;z-index:20;border-bottom:1px solid var(--line)}.toolbar{height:72px;display:flex;align-items:center;gap:24px}.brand{display:flex;align-items:center;text-decoration:none;min-width:155px;max-width:220px}.brand .media{padding:0;background:transparent;border:0;justify-content:flex-start}.brand-fallback{display:none;color:var(--heading);font-size:16px;font-weight:800;letter-spacing:.04em}.brand:has(.media-placeholder) .brand-fallback{display:inline}.brand:has(.media-placeholder) .media{display:none}.tagline{color:var(--muted);margin-left:auto;letter-spacing:.1em;font-size:14px}.entry-button{display:inline-flex;align-items:center;justify-content:center;border-radius:8px;background:var(--navy);color:#fff;font-size:14px;font-weight:700;height:42px;padding:0 23px;text-decoration:none;white-space:nowrap}.entry-button:hover{background:#1266a6;color:white}.desktop-nav{background:var(--navy)}.nav-row{display:flex;align-items:stretch;justify-content:space-between;min-height:48px;gap:4px}.nav-row>a{color:#F0FAFF;display:flex;align-items:center;white-space:nowrap;padding:8px 14px;border-bottom:3px solid transparent;text-decoration:none;font-size:14px;font-weight:600}.nav-row>a:hover,.nav-row>a[aria-current=page]{color:#fff;border-bottom-color:var(--cyan);background:rgba(255,255,255,.1)}.skip-link{position:absolute;left:8px;top:-60px;z-index:100;background:white;padding:8px}.skip-link:focus{top:8px}.menu-toggle{display:none;width:40px;height:40px;border:1px solid var(--line);background:white;border-radius:8px;flex-shrink:0;align-items:center;justify-content:center;flex-direction:column;gap:5px}.menu-toggle span{width:20px;height:2px;background:var(--heading)}.drawer,.drawer-overlay{display:none}.media{width:100%;min-width:0;display:flex;align-items:center;justify-content:center;overflow:hidden;border-radius:14px;background:var(--pale);border:1px solid var(--line)}.media img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.media-placeholder{display:block;width:72%;height:52%;border:1px dashed #BBD7E1;border-radius:10px;background:linear-gradient(135deg,#eaf6fa,#daeef5)}.media--logo{height:38px;width:auto;max-width:220px;border:0;background:none;justify-content:flex-start}.media--logo img{max-height:38px}.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}.media--wide{height:auto;min-height:110px;aspect-ratio:2.8}.media--portrait:not(.media--mobile){max-width:310px;margin:auto}.section{padding:54px 0}.section.soft{background:var(--pale2)}.section.pale{background:var(--pale)}.eyebrow{font-size:12px;letter-spacing:.14em;text-transform:uppercase;font-weight:800;color:#137c97}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:22px}.section-heading h2{margin:0}.section-heading>a{font-size:14px;font-weight:700}.hero{display:grid;grid-template-columns:56fr 44fr;gap:36px;align-items:center;padding:54px 0 50px}.hero h1{font-size:clamp(38px,3.5vw,42px);line-height:1.34;color:var(--heading);margin:11px 0 22px}.hero p{font-size:16px;max-width:660px}.hero .media{box-shadow:0 14px 35px rgba(23,75,120,.06)}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}.action{display:inline-flex;align-items:center;min-height:44px;padding:8px 20px;background:var(--navy);color:white;border-radius:8px;text-decoration:none;font-weight:700;font-size:14px}.action:hover{color:white;background:var(--blue)}.action.ghost{background:white;color:var(--navy);border:1px solid #bfd5e3}.quick-bar{border-block:1px solid var(--line);background:#fff}.quick-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0}.quick-grid>div{padding:12px 16px;border-right:1px solid var(--line);font-size:13px}.quick-grid>div:last-child{border-right:0}.quick-grid strong{color:var(--heading);margin-right:8px}.quick-grid a{margin:0 5px;white-space:nowrap}.topic-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.topic-card{border:1px solid var(--line);border-radius:12px;padding:22px;background:white;text-decoration:none;display:block;min-height:155px;transition:border-color .2s,transform .2s}.topic-card:hover{border-color:var(--sky);transform:translateY(-2px)}.topic-card h3{margin:2px 0 9px;font-size:18px;color:var(--heading)}.topic-card p{margin:0;color:var(--muted);font-size:14px;line-height:1.7}.feature-split{display:grid;grid-template-columns:2fr 1fr;gap:22px}.feature-card,.panel,.note{background:white;border:1px solid var(--line);border-radius:14px;padding:25px}.feature-card h3,.panel h3{margin:0 0 10px}.feature-aside{display:grid;gap:14px}.feature-aside .panel{padding:20px}.feature-card p,.panel p{margin:6px 0 12px}.story-split{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:40px}.story-split.reverse .media{order:-1}.story-split h2{margin-top:0}.micro-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.micro-grid article{padding:23px;border-top:3px solid var(--cyan);background:#fff;border-radius:0 0 10px 10px}.micro-grid h3{margin:0 0 10px}.steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;counter-reset:steps}.steps>div{padding:18px;background:#fff;border:1px solid var(--line);border-radius:12px;position:relative}.steps>div:before{counter-increment:steps;content:'0' counter(steps);display:block;color:var(--blue);font-weight:800;font-size:22px}.steps strong{display:block;color:var(--heading)}.page-intro{padding:44px 0 30px;max-width:1000px}.page-intro h1{font-size:34px;line-height:1.35;color:var(--heading);margin:9px 0 16px}.page-intro p{max-width:840px;font-size:17px}.prose{max-width:780px}.prose p{margin:0 0 17px}.prose h2,.content-section h2{margin:0 0 16px;color:var(--heading);font-size:26px;line-height:1.35}.prose h3,.content-section h3{font-size:20px;color:var(--heading);line-height:1.4}.content-section{margin:30px 0 48px}.content-section p{margin:0 0 14px}.chips{display:flex;gap:10px;flex-wrap:wrap;margin:15px 0 24px}.chips a{background:var(--pale);border:1px solid var(--line);padding:6px 13px;border-radius:6px;font-size:14px;text-decoration:none}.table-scroll{overflow-x:auto;margin:18px 0 22px;border:1px solid var(--line);border-radius:12px;background:white}table{border-collapse:collapse;width:100%;min-width:570px;font-size:15px}th,td{padding:14px 16px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}th{background:var(--pale2);color:var(--heading);font-weight:700}tr:last-child td{border-bottom:0}.two-columns{display:grid;grid-template-columns:1fr 1fr;gap:24px}.three-columns{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.article-layout{display:grid;grid-template-columns:minmax(0,760px) minmax(0,240px);gap:40px;align-items:start}.sidebox{background:var(--pale2);padding:20px;border-left:4px solid var(--cyan);border-radius:8px;position:sticky;top:16px}.sidebox h2{font-size:18px;margin:0 0 14px}.sidebox dl{margin:0}.sidebox dt{font-weight:700;color:var(--heading)}.sidebox dd{margin:0 0 13px;font-size:14px}.numbered{display:grid;gap:12px;counter-reset:step}.numbered article{counter-increment:step;border:1px solid var(--line);background:white;padding:20px 24px;border-radius:10px}.numbered article h3:before{content:counter(step) '. ';color:var(--blue)}.numbered article h3{margin:0 0 8px}.numbered article p{margin:0}.matrix{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.matrix article{background:white;border-top:4px solid var(--cyan);border-radius:10px;padding:22px;border-inline:1px solid var(--line);border-bottom:1px solid var(--line)}.matrix h3{margin-top:0}.exhibit{display:grid;grid-template-columns:1fr 1fr;gap:20px}.exhibit figure{margin:0;background:white;border:1px solid var(--line);padding:15px;border-radius:12px}.exhibit figcaption{padding:12px 4px 2px;color:var(--body);font-size:14px}.faq details{background:white;border:1px solid var(--line);border-radius:8px;margin:9px 0}.faq summary{padding:13px 17px;cursor:pointer;color:var(--heading);font-weight:700}.faq details p{padding:0 17px 15px;margin:0}.related{border-top:1px solid var(--line);padding:24px 0 42px}.related h2{font-size:22px;color:var(--heading)}.related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.related-grid a{background:white;border:1px solid var(--line);padding:17px;text-decoration:none;border-radius:10px;font-weight:700}.editor-note{padding:26px;background:var(--pale);border-left:4px solid var(--cyan);margin-bottom:35px}.editor-note p{margin:0}.site-footer{background:var(--foot);color:#EAF7FF;padding-top:46px}.footer-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:65px}.footer-brand{font-size:22px}.footer-brand small{font-size:12px;display:block;letter-spacing:.15em}.site-footer p{max-width:620px;font-size:14px;opacity:.88}.footer-links{display:grid;grid-template-columns:1fr 1fr;gap:7px 20px;margin-top:13px}.site-footer a{color:#EAF7FF;font-size:14px}.footer-bottom{border-top:1px solid rgba(255,255,255,.18);padding:16px 0;display:flex;justify-content:space-between;gap:12px;font-size:12px;margin-top:35px}.mobile-bottom{display:none}.back-top{position:fixed;bottom:24px;right:24px;background:var(--navy);color:white;border:0;border-radius:10px;width:42px;height:42px;opacity:0;visibility:hidden;transition:opacity .2s;z-index:10}.back-top.visible{opacity:1;visibility:visible}.reading-table td:first-child{font-weight:700;color:var(--heading)}
@media(max-width:1180px){.container{width:calc(100% - 44px)}.nav-row>a{padding-inline:9px}}@media(max-width:980px){.toolbar{height:64px;justify-content:space-between;gap:12px}.menu-toggle{display:flex}.brand{min-width:0;justify-content:center;max-width:180px}.brand .media{height:30px;max-width:172px}.brand .media img{max-height:30px}.brand-fallback{font-size:12px}.tagline,.desktop-nav{display:none}.entry-button{height:40px;padding:0 14px;font-size:13px}.drawer-overlay{display:block;position:fixed;inset:0;z-index:40;background:rgba(11,34,52,.48);opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s,visibility .2s}.drawer-overlay.is-visible{opacity:1;visibility:visible;pointer-events:auto}.drawer{display:block;position:fixed;left:0;top:0;bottom:0;width:min(86vw,344px);background:white;z-index:41;transform:translateX(-102%);transition:transform .22s;overflow-y:auto;box-shadow:5px 0 25px rgba(0,0,0,.1)}.drawer.is-open{transform:translateX(0)}.drawer-head{display:flex;align-items:center;justify-content:space-between;padding:16px;border-bottom:1px solid var(--line);color:var(--heading)}.drawer-close{background:var(--pale2);border:0;border-radius:8px;font-size:27px;width:40px;height:40px}.drawer nav{padding:12px 18px 28px}.drawer nav p{font-size:12px;color:var(--muted);font-weight:700;margin:14px 0 4px}.drawer nav a{display:block;padding:9px 10px;text-decoration:none;color:var(--heading);border-bottom:1px solid var(--line)}.topic-grid{grid-template-columns:repeat(2,1fr)}.quick-grid{grid-template-columns:1fr;gap:0}.quick-grid>div{border-right:0;border-bottom:1px solid var(--line)}.article-layout{grid-template-columns:minmax(0,1fr)}.sidebox{position:static}.mobile-bottom{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;bottom:0;left:0;right:0;background:white;border-top:1px solid var(--line);z-index:22;padding-bottom:env(safe-area-inset-bottom);box-shadow:0 -3px 18px rgba(0,0,0,.05)}.mobile-bottom a{padding:10px 3px;text-align:center;font-size:13px;font-weight:700;text-decoration:none}.site-footer{padding-bottom:calc(65px + env(safe-area-inset-bottom))}.back-top{bottom:80px}}@media(max-width:760px){.story-split,.feature-split,.two-columns{grid-template-columns:1fr}.story-split.reverse .media{order:0}.matrix,.micro-grid,.three-columns{grid-template-columns:1fr}.hero{grid-template-columns:1fr;padding:34px 0;gap:20px}.hero>div:first-child{order:2}.hero>.media{order:1}.hero h1{font-size:30px}.page-intro h1{font-size:28px}.page-intro p{font-size:16px}.section{padding:36px 0}.steps{grid-template-columns:1fr 1fr}.exhibit{grid-template-columns:1fr}.related-grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr;gap:22px}}@media(max-width:640px){.container{width:calc(100% - 32px)}body{font-size:15px;line-height:1.77}.media--hero{height:200px}.media--feature{height:180px}.media--card{height:145px}.media--banner{height:150px}.media--mobile{height:290px;max-width:250px}.topic-card{padding:16px;min-height:175px}.topic-card h3{font-size:16px}.topic-card p{font-size:13px}.section-heading h2,.prose h2,.content-section h2{font-size:22px}.feature-card,.panel{padding:18px}.story-split{gap:18px}.footer-bottom{flex-direction:column}.quick-grid>div{line-height:2}.steps{grid-template-columns:1fr 1fr}.page-intro{padding:28px 0 14px}.hero h1{font-size:29px}}@media(max-width:360px){.topic-grid{grid-template-columns:1fr}.steps{grid-template-columns:1fr}.brand{max-width:125px}.entry-button{padding-inline:9px}.toolbar{gap:6px}}@media(max-height:480px) and (max-width:980px){.mobile-bottom{position:static}.site-footer{padding-bottom:0}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition-duration:.01ms!important;animation-duration:.01ms!important}}
