:root{color-scheme:light;--ink:#1c293d;--muted:#64748b;--blue:#315cc9;--line:#e2e9f1;--paper:#f6f8fc;--white:#fff}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.75}
a{color:inherit}
a:focus-visible{outline:3px solid #e3ab64;outline-offset:4px;border-radius:3px}
.skip-link{position:absolute;left:16px;top:-60px;z-index:100;padding:8px 14px;background:var(--ink);color:#fff}
.skip-link:focus{top:12px}
.site-header{position:relative;z-index:10;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line)}
.header-inner{max-width:1180px;margin:auto;min-height:72px;padding:12px 24px;display:flex;align-items:center;justify-content:space-between;gap:28px}
.brand{display:flex;align-items:center;gap:10px;white-space:nowrap;text-decoration:none;font-size:18px;font-weight:750}
.brand img{border-radius:10px}
.site-header nav{display:flex;align-items:center;gap:28px;flex-wrap:wrap}
.site-header nav a{font-size:14px;color:#46566d;text-decoration:none}
.site-header nav a:hover,.site-header nav a[aria-current]{color:var(--blue)}
.site-header nav a[aria-current]{font-weight:700}
.page-shell{max-width:1180px;margin:auto;padding:0 24px}
.hero{background:radial-gradient(circle at 82% 32%,rgba(111,160,255,.28),transparent 28%),linear-gradient(115deg,#102849,#243e71 62%,#4269ae);color:white;overflow:hidden}
.hero-inner{max-width:1180px;margin:auto;padding:80px 24px 88px;position:relative;z-index:1}
.eyebrow{font-size:12px;letter-spacing:.15em;font-weight:750;color:#5273b9}
.hero .eyebrow{color:#b8ccfa}
.hero h1{max-width:700px;margin:14px 0 16px;font-size:clamp(38px,6vw,64px);line-height:1.2;letter-spacing:-.045em}
.hero p{max-width:660px;margin:0;color:#e3ebff;font-size:18px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}
.button{min-height:44px;display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 20px;border-radius:10px;text-decoration:none;font-size:14px;font-weight:700}
.button-primary{background:#fff;color:#204788}
.button-secondary{border:1px solid rgba(255,255,255,.55);color:#fff}
.button-light{background:#fff;color:#234984;white-space:nowrap}
.button:hover{transform:translateY(-1px)}
.hero-mark{position:absolute;right:max(5%,calc((100vw - 1180px)/2));top:150px;display:flex;gap:9px;transform:rotate(-8deg);opacity:.28}
.hero-mark span{width:56px;height:76px;border:1px solid #fff;border-radius:9px;display:grid;place-items:center;font-size:30px;font-family:serif}
.breadcrumbs{display:flex;align-items:center;gap:9px;flex-wrap:wrap;margin:24px 0 30px;color:#7a8799;font-size:13px}
.breadcrumbs a{text-decoration:none;color:#536e9a}
.breadcrumbs a:hover{text-decoration:underline}
.intro-note{max-width:760px;margin:0 0 52px;font-size:17px;color:#4a5a70}
.group{margin:0 0 62px}
.section-heading{display:flex;justify-content:space-between;align-items:end;gap:16px;margin-bottom:20px}
.section-heading h2{margin:0 0 4px;font-size:27px;line-height:1.35}
.section-heading p{margin:0;color:var(--muted);font-size:14px}
.section-heading>span,.section-heading>a{color:#59749e;font-size:13px;white-space:nowrap}
.section-heading>a{text-decoration:none}
.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.guide-card{display:flex;flex-direction:column;min-height:238px;padding:25px 25px 22px;background:#fff;border:1px solid var(--line);border-radius:16px;text-decoration:none;box-shadow:0 6px 24px rgba(26,43,79,.035);transition:transform .2s,box-shadow .2s,border-color .2s}
.guide-card:hover{transform:translateY(-3px);border-color:#aec4e8;box-shadow:0 12px 32px rgba(26,43,79,.09)}
.guide-card h3{margin:11px 0 8px;font-size:20px;line-height:1.4}
.guide-card p{margin:0;color:#657287;font-size:14px;line-height:1.7}
.card-link{margin-top:auto;padding-top:22px;font-size:13px;color:var(--blue);font-weight:700}
.bottom-cta{display:flex;justify-content:space-between;align-items:center;gap:24px;margin:36px 0 88px;padding:32px 38px;border-radius:18px;background:linear-gradient(115deg,#214673,#3a69a3);color:#fff}
.bottom-cta .eyebrow{color:#b8ccfa}
.bottom-cta h2{margin:6px 0;font-size:24px}
.bottom-cta p{margin:0;color:#e1eafd;font-size:14px}
.site-footer{background:#13253d;color:#c0ccdc;padding:42px 24px 22px}
.footer-inner{max-width:1132px;margin:auto;display:flex;align-items:start;justify-content:space-between;gap:24px}
.footer-inner strong{color:#fff}
.footer-inner p{font-size:13px;margin:4px 0}
.footer-inner nav{display:flex;gap:20px;flex-wrap:wrap}
.footer-inner nav a{font-size:13px;text-decoration:none}
.footer-inner nav a:hover{text-decoration:underline}
.copyright{max-width:1132px;margin:34px auto 0;padding-top:17px;border-top:1px solid #35455a;font-size:12px}
.article-shell{padding-bottom:88px}
.article-layout{display:grid;grid-template-columns:minmax(0,760px) minmax(210px,280px);gap:50px;align-items:start}
.article{min-width:0}
.article-header{padding:10px 0 30px;border-bottom:1px solid var(--line)}
.article-header h1{margin:11px 0 16px;font-size:clamp(32px,4vw,46px);line-height:1.27;letter-spacing:-.035em}
.article-lead{margin:0;color:#45576e;font-size:18px;line-height:1.8}
.article-meta{margin:20px 0 0;font-size:13px;color:#8290a1}
.article-body section{padding-top:24px;scroll-margin-top:20px}
.article-body h2{margin:12px 0 14px;font-size:24px;line-height:1.45}
.article-body p,.article-body li{color:#435369;font-size:16px;line-height:1.92}
.article-body p{margin:0 0 16px}
.article-body ul,.article-body ol{padding-left:24px;margin:0 0 18px}
.article-body li{padding-left:3px;margin-bottom:8px}
.article-body strong{color:#243f67}
.data-table{overflow-x:auto;margin:18px 0 22px;border:1px solid var(--line);border-radius:12px;background:#fff}
.data-table table{width:100%;border-collapse:collapse;min-width:370px;text-align:left;font-size:14px}
.data-table th,.data-table td{padding:12px 16px;border-bottom:1px solid var(--line)}
.data-table tr:last-child td{border-bottom:0}
.data-table th{background:#edf3fa;color:#3f5d89}
.editor-note{margin:36px 0 0;padding:20px 24px;background:#eaf1fa;border-left:3px solid #597fc3;border-radius:0 10px 10px 0}
.editor-note p{margin:5px 0 0;font-size:14px}
.article-aside{position:sticky;top:24px}
.toc,.aside-cta{border:1px solid var(--line);border-radius:14px;background:#fff;padding:22px}
.toc h2{margin:0 0 10px;font-size:16px}
.toc ol{margin:0;padding-left:20px}
.toc li{margin:8px 0;color:#73849a;font-size:13px}
.toc a{text-decoration:none;color:#4b5c72}
.toc a:hover{color:var(--blue)}
.aside-cta{margin-top:14px;background:#eaf1fc}
.aside-cta strong{font-size:15px}
.aside-cta p{font-size:13px;color:#586b85;margin:8px 0 10px}
.aside-cta a{font-size:13px;color:var(--blue);font-weight:700;text-decoration:none}
.related-guides{margin-top:70px;padding-top:32px;border-top:1px solid var(--line)}
.related-guides .guide-card{min-height:210px}

@media(max-width:850px){.article-layout{grid-template-columns:1fr}
.article-aside{position:static;display:grid;grid-template-columns:1fr 1fr;gap:14px}
.aside-cta{margin-top:0}
.card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
.hero-mark{opacity:.13;right:2%;top:95px}
.hero-inner{padding-top:64px;padding-bottom:70px}
}

@media(max-width:600px){.header-inner{align-items:flex-start;flex-direction:column;gap:10px;padding:12px 18px}
.site-header nav{gap:14px}
.site-header nav a{font-size:12px}
.page-shell{padding:0 18px}
.hero-inner{padding:56px 18px 64px}
.hero h1{font-size:clamp(30px,8.5vw,34px);letter-spacing:-.055em}
.hero p{font-size:16px}
.hero-mark{display:none}
.intro-note{margin-bottom:38px;font-size:15px}
.group{margin-bottom:46px}
.card-grid{grid-template-columns:1fr}
.guide-card{min-height:0}
.bottom-cta{flex-direction:column;align-items:start;margin-bottom:58px;padding:26px}
.footer-inner{flex-direction:column}
.article-aside{grid-template-columns:1fr}
.article-header h1{font-size:32px}
.article-lead{font-size:16px}
.article-body h2{font-size:21px}
.article-body p,.article-body li{font-size:15px}
}