:root{--brand-navy:#1f2d3d;--brand-orange:#c07845;--brand-cream:#f7f6f3;--navy-700:#394858;--navy-500:#64717d;--orange-100:#f3e5da;--paper:#fff;--text:#25282b;--muted:#6b7075;--border:#d8d6d1;--surface-muted:#eceae6;--content:72rem;--reading:45rem;--font-heading:"Songti SC", STSong, SimSun, serif;--font-body:"PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;color-scheme:light;font-family:var(--font-body);font-synthesis:none;text-rendering:optimizelegibility}*,:before,:after{box-sizing:border-box}html{background:var(--brand-cream);color:var(--text);scroll-behavior:smooth;scroll-padding-top:6rem}body{background:var(--brand-cream);min-width:20rem;min-height:100vh;color:var(--text);font-family:var(--font-body);overflow-wrap:break-word;margin:0;font-size:1rem;line-height:1.7}.visually-hidden{clip:rect(0, 0, 0, 0);clip-path:inset(50%);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}button,input,select,textarea{color:inherit;font:inherit}a{color:var(--brand-navy);text-decoration-color:var(--brand-orange);text-underline-offset:.18em;text-decoration-thickness:.08em}a:hover{color:var(--navy-700)}:focus-visible{outline:3px solid var(--brand-orange);outline-offset:3px}img,svg,video{max-width:100%;display:block}h1,h2,h3,h4,h5,h6{color:var(--brand-navy);font-family:var(--font-heading);overflow-wrap:anywhere;scroll-margin-top:6rem;font-weight:700;line-height:1.3}p,ul,ol,blockquote,figure,table{margin-block:0 1.3em}.shell-width{width:min(calc(100% - 2.5rem), var(--content));margin-inline:auto}.skip-link{z-index:100;background:var(--paper);border:2px solid var(--brand-orange);color:var(--brand-navy);padding:.65rem .9rem;font-weight:700;position:fixed;top:.75rem;left:.75rem;transform:translateY(-160%)}.skip-link:focus{transform:translateY(0)}.site-header{border-top:.25rem solid var(--brand-navy);border-bottom:1px solid var(--border);background:color-mix(in srgb, var(--brand-cream) 96%, var(--paper))}.site-header__inner{justify-content:space-between;align-items:center;gap:2rem;min-height:5rem;display:flex}.site-brand{min-height:2.75rem;color:var(--brand-navy);font-family:var(--font-heading);letter-spacing:.08em;white-space:nowrap;align-items:center;gap:.6rem;font-size:clamp(1.22rem,2vw,1.55rem);font-weight:700;text-decoration:none;display:inline-flex}.site-brand:before{background:var(--brand-orange);content:"";width:.24rem;height:1.35rem}.navigation-toggle{border:1px solid var(--navy-500);min-width:2.75rem;min-height:2.75rem;color:var(--brand-navy);cursor:pointer;background:0 0;border-radius:.15rem;justify-content:center;align-items:center;padding:.5rem .7rem;display:none}.navigation-toggle__icon,.navigation-toggle__icon:before,.navigation-toggle__icon:after{content:"";background:currentColor;width:1.25rem;height:2px;display:block}.navigation-toggle__icon{position:relative}.navigation-toggle__icon:before,.navigation-toggle__icon:after{position:absolute;left:0}.navigation-toggle__icon:before{top:-.38rem}.navigation-toggle__icon:after{top:.38rem}.site-navigation__list{align-items:stretch;gap:.15rem;margin:0;padding:0;list-style:none;display:flex}.site-navigation a{min-height:2.75rem;color:var(--navy-700);white-space:nowrap;align-items:center;padding:.5rem .65rem;font-size:.92rem;text-decoration:none;display:inline-flex;position:relative}.site-navigation a[aria-current=page]{color:var(--brand-navy);font-weight:700}.site-navigation a[aria-current=page]:after{background:var(--brand-orange);content:"";height:.16rem;position:absolute;bottom:.2rem;left:.65rem;right:.65rem}.site-main{min-height:58vh}.site-footer{border-top:.18rem solid var(--brand-orange);background:var(--brand-navy);color:var(--brand-cream);margin-top:clamp(4rem,8vw,7rem);padding-block:2.6rem}.site-footer__inner{grid-template-columns:minmax(0,1fr) minmax(15rem,.72fr);gap:2rem clamp(2rem,8vw,7rem);display:grid}.site-footer p{margin:0}.site-footer__purpose{max-width:38rem;font-family:var(--font-heading);font-size:1.1rem;line-height:1.75}.site-footer__notice{color:color-mix(in srgb, var(--brand-cream) 80%, var(--navy-500));font-size:.88rem}.breadcrumbs{color:var(--muted);margin-block:1.5rem 2rem;font-size:.88rem}.breadcrumbs ol{flex-wrap:wrap;gap:.35rem .55rem;margin:0;padding:0;list-style:none;display:flex}.breadcrumbs li:not(:last-child):after{color:var(--border);content:"/";margin-left:.55rem}.breadcrumbs [aria-current=page]{color:var(--navy-700)}.article-page{padding-bottom:1rem}.article-frame{grid-template-columns:minmax(10rem, 14rem) minmax(0, var(--reading));justify-content:center;gap:clamp(2rem,7vw,6rem);display:grid}.article-margin{min-width:0;padding-top:.4rem}.article-margin__label{color:var(--navy-500);letter-spacing:.12em;margin:0 0 1rem;font-size:.75rem;font-weight:700}.article-facts{border-top:2px solid var(--brand-navy);margin:0}.article-facts__row{border-bottom:1px solid var(--border);gap:.15rem;padding-block:.72rem;display:grid}.article-facts dt{color:var(--muted);font-size:.74rem}.article-facts dd{color:var(--brand-navy);overflow-wrap:anywhere;margin:0;font-size:.86rem;font-weight:600}.article-column{min-width:0}.article-header{border-bottom:1px solid var(--border);padding-bottom:clamp(1.8rem,4vw,3rem)}.article-kicker{color:var(--navy-500);align-items:center;gap:.65rem;margin:0 0 1rem;font-size:.8rem;display:flex}.article-kicker:before{background:var(--brand-orange);content:"";width:1.8rem;height:.16rem}.article-header h1{letter-spacing:-.025em;margin:0;font-size:clamp(2rem,5vw,3.6rem)}.article-byline{color:var(--muted);margin:1.25rem 0 0;font-size:.9rem}.article-body{background:var(--paper);padding-top:clamp(2rem,5vw,3.5rem)}.prose{max-width:var(--reading);color:var(--text);overflow-wrap:anywhere;word-break:normal;font-size:clamp(1rem,1.3vw,1.1rem);line-height:1.92}.prose>:first-child{margin-top:0}.prose h2{margin-block:2.5em .8em;font-size:clamp(1.55rem,3vw,2rem)}.prose h3{margin-block:2em .7em;font-size:clamp(1.25rem,2.3vw,1.55rem)}.prose a{overflow-wrap:anywhere}.prose img{height:auto;margin-block:2rem}.prose table{border-collapse:collapse;overscroll-behavior-inline:contain;white-space:nowrap;width:100%;max-width:100%;display:block;overflow-x:auto}.prose th,.prose td{border:1px solid var(--border);text-align:left;padding:.65rem .8rem}.prose blockquote{border-left:.2rem solid var(--brand-orange);color:var(--navy-700);margin-inline:0;padding:.15rem 0 .15rem 1.2rem}.table-of-contents{color:var(--navy-700);margin-top:2rem;font-size:.82rem}.table-of-contents__details{border-top:1px solid var(--border)}.table-of-contents__summary{min-height:2.75rem;color:var(--brand-navy);cursor:pointer;align-items:center;font-weight:700}.table-of-contents__list{margin:0;padding:.8rem 0 0 1rem}.table-of-contents__list li{margin-bottom:.6rem}.table-of-contents__list li[data-depth="3"]{margin-left:.75rem}.table-of-contents a{text-decoration-thickness:1px}.article-support{max-width:var(--reading);border-top:2px solid var(--brand-navy);gap:2rem;margin:3.5rem 0 0 auto;padding-top:1.5rem;display:grid}.article-support h2{margin:0 0 .8rem;font-size:1.25rem}.article-source p,.article-related ul{margin:0}.article-related ul{padding-left:1.2rem}.article-pagination{grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem;display:grid}.article-pagination a{border-top:1px solid var(--border);flex-direction:column;justify-content:center;min-height:4rem;padding:.8rem 0;display:flex}.article-pagination__next{text-align:right}.article-pagination__label{color:var(--muted);font-size:.75rem;text-decoration:none}@media (width>=56.01rem){.table-of-contents{position:sticky;top:2rem}.table-of-contents__summary{display:none}}@media (width<=56rem){.site-header__inner{flex-wrap:wrap;gap:0;min-height:4.4rem}.navigation-toggle{display:inline-flex}.site-navigation{border-top:1px solid var(--border);width:100%;padding-block:.4rem .8rem}.site-navigation[hidden]{display:none}.site-navigation__list{grid-template-columns:repeat(2,minmax(0,1fr));display:grid}.site-navigation a{width:100%}.article-frame{grid-template-columns:minmax(0,1fr);gap:2rem}.article-column{display:contents}.article-header{grid-row:1}.article-margin{grid-row:2;padding-top:0}.article-body{grid-row:3;padding-top:.5rem}.article-facts{grid-template-columns:repeat(2,minmax(0,1fr));gap:0 1rem;display:grid}.article-support{margin-inline:auto}}@media (width<=38rem){.shell-width{width:min(calc(100% - 1.5rem), var(--content))}.site-navigation__list,.site-footer__inner,.article-pagination{grid-template-columns:minmax(0,1fr)}.site-navigation a{padding-inline:.25rem}.article-header h1{font-size:clamp(1.8rem,10vw,2.5rem)}.article-facts{grid-template-columns:minmax(0,1fr)}.article-pagination__next{text-align:left}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}