:root{color-scheme:light;--ink:#162e43;--muted:#667582;--line:#dce4e8;--accent:#267e88;--paper:#fbfcfc}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--paper);color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}a:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:5px}.skip{position:absolute;left:16px;top:-80px;background:white;padding:12px;z-index:4}.skip:focus{top:12px}
.masthead{max-width:1280px;margin:auto;padding:28px 56px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);font-size:13px}.brand{font-size:20px;font-weight:700;letter-spacing:2px}.brand span{font-size:12px;font-weight:400;letter-spacing:1px;border-left:1px solid #b7c5cd;margin-left:18px;padding-left:18px;color:var(--muted)}.masthead>a{padding:8px 0}.masthead>a span{margin-left:12px;color:var(--accent)}
.hero{max-width:1280px;margin:0 auto;padding:64px 56px 36px}.eyebrow{font-size:13px;color:var(--accent);letter-spacing:2px;margin-bottom:22px}h1{font-size:clamp(27px,3.2vw,43px);line-height:1.65;letter-spacing:.035em;margin:0;font-weight:600}h1 span{font-family:"Noto Serif SC","Songti SC",SimSun,serif;font-weight:500}.hero-rule{margin-top:38px;width:64px;border-top:3px solid var(--accent)}
.layout{max-width:1280px;margin:0 auto;display:grid;grid-template-columns:264px minmax(0,1fr);gap:60px;padding:16px 56px 60px}aside{align-self:start;position:sticky;top:28px;padding-top:12px}summary{font-size:13px;font-weight:600;letter-spacing:2px;cursor:pointer;margin-bottom:16px;color:var(--muted)}nav{display:grid;gap:3px}nav a{display:grid;grid-template-columns:28px minmax(0,1fr);gap:7px;font-size:12px;line-height:1.7;padding:7px 9px 7px 0;color:#536674}nav a span{color:#8b9ba5;font-size:11px}nav a:hover{color:var(--accent);background:#eef4f4}
main{min-width:0}section{border-top:1px solid var(--line);padding:32px 0 38px}.section-label{font-size:12px;letter-spacing:2px;color:var(--accent);margin-bottom:10px}h2{font-size:25px;line-height:1.5;margin:0 0 18px;font-weight:600;letter-spacing:.02em}section p{font-size:16px;line-height:2.05;margin:0 0 22px;color:#435664;text-align:justify}.subsections{list-style:none;margin:0;padding:0;display:grid;gap:11px}.subsections li{display:flex;align-items:baseline;gap:16px;font-size:14px;line-height:1.8}.sub-number{flex:0 0 42px;color:#7b909c;font-size:12px;font-variant-numeric:tabular-nums}footer{border-top:1px solid var(--line);padding-top:26px;display:flex;justify-content:space-between;gap:20px;font-size:12px;color:var(--muted)}footer a{color:var(--accent)}
@media(min-width:1400px){.layout{gap:80px;grid-template-columns:280px minmax(0,1fr)}}
@media(max-width:900px){.masthead{padding:22px 28px}.hero{padding:44px 28px 28px}.layout{padding:0 28px 40px;display:block}aside{position:static;padding:12px 0 24px}nav{grid-template-columns:repeat(2,minmax(0,1fr));column-gap:24px}h2{font-size:23px}section{padding:28px 0 32px}}
@media(max-width:540px){.masthead{padding:20px}.brand{font-size:18px}.brand span{display:none}.hero{padding:36px 20px 25px}h1{font-size:22px;line-height:1.65}.eyebrow{font-size:11px;letter-spacing:1px}.layout{padding:0 20px 32px}nav{grid-template-columns:1fr}section p{font-size:15px;line-height:2}h2{font-size:22px}.subsections li{font-size:14px;gap:10px}footer{flex-direction:column}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media print{body{background:white;color:#000}.masthead,aside,.hero-rule,.skip,footer{display:none}.hero{padding:0 0 20px}.eyebrow{color:#555}h1{font-size:25px}.layout{display:block;padding:0}section{break-inside:avoid;padding:18px 0}h2{font-size:18px}section p{font-size:11pt;line-height:1.7}.subsections li{font-size:10pt}.subsections{gap:3px}@page{size:A4;margin:18mm}}