:root{--bg:#F4F7FA;--white:#fff;--pale:#EAF1F6;--mint:#E9F8F8;--navy:#102E46;--dark:#163C57;--cyan:#13B8C5;--blue:#237BD3;--title:#18364B;--text:#344C60;--muted:#64798A;--border:#DCE6ED}*{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-active{overflow:hidden}h1,h2,h3,p,figure{margin-top:0}h1,h2,h3{line-height:1.38;color:var(--title)}h1{font-size:36px;letter-spacing:-.02em}h2{font-size:27px}h3{font-size:20px}p{margin-bottom:1.2em}a{color:#1366A8;text-decoration-thickness:1px;text-underline-offset:4px}a:hover{color:#086C7C}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--cyan);outline-offset:3px}img{max-width:100%}button{font:inherit;cursor:pointer}.container{max-width:1200px;padding-inline:28px;margin-inline:auto;min-width:0}.site-header{background:white;position:relative;z-index:20}.brand-bar{height:72px;display:flex;align-items:center;gap:18px}.brand-link{display:flex;align-items:center;min-width:0;flex:0 0 auto;text-decoration:none;color:var(--navy)}.brand-link img{display:block;width:auto;height:auto;max-height:38px;max-width:190px;object-fit:contain}.brand-text{font-size:25px;font-weight:800;line-height:1.1}.brand-text small{display:block;font-size:10px;letter-spacing:2px}.brand-note{border-left:1px solid var(--border);padding-left:20px;font-size:13px;color:var(--muted)}.register-link{margin-left:auto;display:inline-flex;align-items:center;justify-content:center;padding:7px 19px;background:var(--navy);color:#fff;text-decoration:none;border-radius:9px;white-space:nowrap;font-weight:700;font-size:14px}.register-link:hover{background:#185377;color:#fff}.desktop-nav{background:var(--navy)}.nav-list{min-height:51px;display:flex;justify-content:space-between;align-items:stretch;gap:5px}.nav-list a{position:relative;display:inline-flex;align-items:center;justify-content:center;color:#F2F9FC;text-decoration:none;font-size:14px;font-weight:600;padding:9px 8px;white-space:nowrap}.nav-list a:hover,.nav-list a[aria-current="page"]{color:#fff}.nav-list a[aria-current="page"]{font-weight:800}.nav-list 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img{display:block;width:auto;height:auto;max-width:100%;max-height:var(--media-limit,185px);object-fit:contain;object-position:center}.media-frame--hero{--media-limit:310px}.media-frame--feature{--media-limit:250px}.media-frame--card{--media-limit:185px}.media-frame--rules{--media-limit:220px}.media-frame--banner{--media-limit:210px}.media-frame--mobile{--media-limit:350px;max-width:320px;margin:auto}.media-placeholder{display:flex;align-items:center;justify-content:center;width:100%;min-height:100px;max-height:180px;padding:24px;text-align:center;color:#718A9B;border:1px dashed #B1C7D3;border-radius:8px;background:#F1F7FA;font-size:13px}.hero .media-placeholder{min-height:170px}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:34px;align-items:start}.split-feature{display:grid;grid-template-columns:43fr 57fr;gap:36px;align-items:center}.content-aside{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:36px}.reader{max-width:780px}.reader p,.article-section p{line-height:1.84}.article-section{margin:0 0 46px}.note-panel{border-left:4px solid var(--cyan);background:var(--mint);padding:18px 22px;margin:22px 0;border-radius:0 10px 10px 0}.soft-panel{padding:24px;background:white;border:1px solid var(--border);border-radius:13px}.dark-panel{background:var(--dark);color:#EAF6FC;padding:27px 30px;border-radius:13px}.dark-panel h2,.dark-panel h3{color:#fff}.topic-directory{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 36px}.topic-item{border-top:1px solid var(--border);padding:20px 6px 22px 0}.topic-item strong{font-size:19px;color:var(--title)}.topic-item p{margin:6px 0 8px;font-size:15px}.focus-grid{display:grid;grid-template-columns:2fr 1fr;gap:28px}.focus-main{background:var(--white);padding:30px;border-left:5px solid var(--cyan)}.focus-side{display:grid;gap:16px}.focus-side article{padding:21px;background:var(--pale)}.focus-side h3{margin-bottom:7px}.horizontal-band{display:grid;grid-template-columns:1fr 1fr 1fr;gap:26px;padding:24px 0;border-top:1px solid var(--border);border-bottom:1px solid var(--border)}.horizontal-band h3{margin-bottom:8px}.rule-trio{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;align-items:start}.rule-trio article{padding:23px;border:1px solid var(--border);background:white;border-radius:12px}.rule-trio article:nth-child(2){margin-top:22px}.rule-trio article:nth-child(3){margin-top:43px}.steps{list-style:none;counter-reset:step;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin:24px 0;padding:0}.steps li{counter-increment:step;background:white;border-top:3px solid var(--cyan);padding:18px 18px 20px;min-width:0}.steps li:before{content:counter(step,decimal-leading-zero);display:block;font-weight:800;color:#0A8693;font-size:24px}.steps li strong{display:block;color:var(--title)}.steps li p{font-size:14px;margin:4px 0 0}.text-link-item{display:grid;grid-template-columns:1fr auto;column-gap:14px;text-decoration:none;border-top:1px solid var(--border);padding:13px 0;color:var(--title)}.text-link-item strong{font-size:16px}.text-link-item span:nth-child(2){grid-column:1;font-size:13px;color:var(--muted)}.text-link-item span:last-child{grid-column:2;grid-row:1 / 3;align-self:center;color:#258295}.inline-nav{display:flex;flex-wrap:wrap;gap:8px;margin:28px 0 36px}.inline-nav a{padding:8px 15px;border:1px solid var(--border);border-radius:8px;background:#fff;text-decoration:none;font-weight:700;font-size:14px}.fact-index{position:sticky;top:15px;background:#EAF1F6;padding:22px;border-radius:12px}.fact-index h3{font-size:17px}.fact-index ul{padding-left:20px;margin-bottom:0}.fact-index li{margin:10px 0;font-size:14px}.table-scroll{width:100%;overflow-x:auto;margin:20px 0 28px;border:1px solid var(--border);border-radius:11px}.data-table{width:100%;border-collapse:collapse;background:white;min-width:590px;text-align:left}.data-table caption{text-align:left;font-size:14px;color:var(--muted);padding:12px 15px;caption-side:top}.data-table th,.data-table td{border-bottom:1px solid var(--border);padding:12px 15px;vertical-align:top;font-size:14px}.data-table th{background:#EAF1F6;color:var(--title)}.data-table tr:last-child td{border-bottom:0}.vertical-steps{counter-reset:vstep;list-style:none;padding:0}.vertical-steps li{position:relative;padding:0 0 25px 55px;border-left:2px solid #B9DBE1;margin-left:18px;counter-increment:vstep}.vertical-steps li:before{content:counter(vstep);position:absolute;left:-18px;top:0;width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:var(--navy);color:#fff;font-weight:800}.vertical-steps li:last-child{border-left-color:transparent}.vertical-steps h3{margin-bottom:8px}.matrix{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.matrix article{padding:22px;background:white;border:1px solid var(--border);border-radius:12px}.matrix article:nth-child(2){background:var(--mint)}.matrix article:nth-child(3){background:var(--pale)}.gallery-grid{display:grid;grid-template-columns:1fr 1fr;gap:35px;align-items:start}.gallery-grid article:nth-child(2){margin-top:60px}.gallery-grid article:nth-child(3){grid-column:1 / -1;display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:32px}.toc{padding:18px 23px;border:1px solid var(--border);background:#fff;border-radius:12px;max-width:760px}.toc a{display:inline-block;margin:5px 15px 5px 0}.faq details{background:white;border:1px solid var(--border);border-radius:9px;margin:9px 0;padding:0 18px}.faq summary{padding:13px 4px;font-weight:700;color:var(--title);cursor:pointer}.faq details p{margin:0;padding:0 4px 16px;font-size:15px}.about-layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:36px}.about-links{background:#EAF1F6;padding:20px;border-radius:12px;align-self:start;position:sticky;top:18px}.about-links a{display:block;margin:10px 0}.about-content{min-width:0}.statement{border-top:1px solid var(--border);padding:22px 0;color:var(--muted);font-size:14px}.site-footer{background:#0B2539;color:#DCECF5;padding:46px 0 18px}.site-footer a{color:#DCECF5}.site-footer p{font-size:14px;line-height:1.8}.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:44px}.footer-brand{font-size:22px;font-weight:800;color:#fff;margin-bottom:12px}.footer-brand span{font-size:10px;letter-spacing:1px}.footer-bottom{border-top:1px solid #305268;margin-top:27px;padding-top:16px;display:flex;justify-content:space-between;font-size:13px;gap:12px}.nojs-nav{display:none}section[id],h2[id],article[id]{scroll-margin-top:18px}
@media(max-width:1100px){.container{padding-inline:22px}.hero{gap:24px}.nav-list a{font-size:13px;padding-inline:5px}.brand-note{font-size:12px}}
@media(max-width:920px){.site-header .brand-bar{height:63px;display:grid;grid-template-columns:40px minmax(0,1fr) auto;gap:10px;padding-inline:16px}.menu-toggle{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;border:1px solid var(--border);background:white;width:40px;height:40px;border-radius:9px}.menu-toggle span{display:block;width:19px;height:2px;background:var(--navy)}.brand-link{justify-content:center}.brand-link img{max-height:30px;max-width:min(38vw,180px)}.brand-text{font-size:18px}.brand-text small{font-size:8px}.brand-note,.desktop-nav{display:none}.register-link{margin:0;padding:8px 10px;font-size:12px;height:39px}.drawer-shade{display:block;position:fixed;inset:0;background:rgba(8,25,40,.55);opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s,visibility .2s;z-index:30}.drawer-shade.is-visible{opacity:1;visibility:visible;pointer-events:auto}.mobile-drawer{display:block;position:fixed;top:0;bottom:0;left:0;width:min(86vw,340px);overflow:auto;background:#fff;z-index:31;transform:translateX(-102%);visibility:hidden;transition:transform .2s,visibility .2s;padding:20px}.mobile-drawer.is-open{transform:translateX(0);visibility:visible}.drawer-top{display:flex;align-items:center;justify-content:space-between;color:var(--title);margin-bottom:20px}.drawer-close{background:var(--pale);border:0;border-radius:8px;font-size:27px;width:40px;height:40px;line-height:1}.drawer-group{border-top:1px solid var(--border);padding:14px 0}.drawer-group span{display:block;color:var(--muted);font-weight:700;font-size:13px;margin:0 0 6px}.drawer-group a{display:block;text-decoration:none;color:var(--title);font-weight:700;padding:8px 4px}.mobile-quick{display:flex;gap:14px;flex-wrap:wrap;padding-top:16px;padding-bottom:18px;font-size:13px;justify-content:space-between}.mobile-quick a{color:var(--muted)}.nojs-nav{display:flex;flex-wrap:wrap;gap:8px;padding:12px 16px;background:var(--pale)}.nojs-nav a{font-size:13px}.hero h1{font-size:37px}}
@media(max-width:760px){.two-col,.split-feature,.content-aside,.focus-grid,.gallery-grid,.gallery-grid article:nth-child(3),.about-layout{grid-template-columns:1fr}.fact-index,.about-links{position:static}.about-content{grid-row:1}.about-links{grid-row:2}.hero{grid-template-columns:1fr}.hero .media-frame{max-width:600px}.topic-directory{gap:0 18px}.horizontal-band{grid-template-columns:1fr}.steps{grid-template-columns:1fr 1fr}.rule-trio{grid-template-columns:1fr}.rule-trio article:nth-child(2),.rule-trio article:nth-child(3),.gallery-grid article:nth-child(2){margin-top:0}.gallery-grid article:nth-child(3){display:block}.matrix{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr;gap:24px}.footer-grid>div:first-child{grid-column:1 / -1}.reader{max-width:none}}
@media(max-width:640px){body{font-size:15px}.container{padding-inline:16px}h1{font-size:28px}h2{font-size:22px}h3{font-size:18px}.hero{padding-top:30px}.hero h1{font-size:30px}.hero .lead,.lead{font-size:16px}.section{margin-top:36px;margin-bottom:36px}.section-heading{margin-bottom:18px}.topic-directory{grid-template-columns:1fr}.focus-main{padding:20px}.soft-panel,.dark-panel{padding:19px}.steps{grid-template-columns:1fr}.media-frame--hero{--media-limit:205px}.media-frame--feature{--media-limit:185px}.media-frame--card{--media-limit:145px}.media-frame--rules{--media-limit:175px}.media-frame--banner{--media-limit:135px}.media-frame--mobile{--media-limit:285px;max-width:250px}.footer-grid{grid-template-columns:1fr}.footer-grid>div:first-child{grid-column:auto}.footer-bottom{flex-direction:column}.section-heading{display:block}.section-heading .eyebrow{display:block;margin-bottom:4px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition-duration:.01ms!important;animation-duration:.01ms!important}}