*,*::before,*::after{box-sizing:border-box}
html{font-size:100%;-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:#fff;color:#000;font-family:Karla,"Helvetica Neue",Helvetica,Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;font-size:17px;line-height:1.65;letter-spacing:.012em;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
a{color:#000;text-decoration:none;transition:background .18s ease,color .18s ease,border-color .18s ease}
h1,h2,h3{font-family:"Playfair Display SC",Georgia,"Songti SC",serif;font-weight:700;line-height:1.1;letter-spacing:.02em;margin:0}
:focus-visible{outline:3px solid #000;outline-offset:2px}
.skip{position:absolute;left:-9999px;top:0;z-index:99;background:#000;color:#fff;padding:.8rem 1.1rem;font-weight:700}
.skip:focus{left:0}
/* 顶栏 */
.topbar{position:sticky;top:0;z-index:50;display:grid;grid-template-columns:1fr auto;align-items:center;gap:1rem;background:#fff;border-bottom:2px solid #000;padding:.45rem clamp(12px,3vw,26px)}
.topnav{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:.4rem;min-width:0}
.menu{display:flex;list-style:none;margin:0;padding:0;gap:.1rem;min-width:0}
.menu-a{justify-content:flex-end}
.menu-b{justify-content:flex-start}
.menu a{display:inline-flex;align-items:center;min-height:44px;padding:0 .5rem;font-size:16px;font-weight:500;border-bottom:2px solid transparent}
.menu a:hover{border-bottom-color:#000}
.brand{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 .85rem;border:2px solid #000;font-family:"Playfair Display SC",Georgia,serif;font-size:clamp(16px,1.9vw,22px);letter-spacing:.05em;white-space:nowrap}
.brand:hover{background:#000;color:#fff}
.cta{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 1.1rem;background:#000;color:#fff;border:2px solid #000;font-weight:700;letter-spacing:.08em;font-size:16px;white-space:nowrap}
.cta:hover{background:#fff;color:#000}
/* 首屏 */
.hero{display:grid;grid-template-columns:1.1fr .9fr;min-height:70vh;align-items:stretch;border-bottom:12px solid #000}
.hero-copy{display:flex;flex-direction:column;justify-content:center;gap:1.2rem;padding:clamp(28px,6vw,64px) clamp(16px,4vw,52px);max-width:46ch}
.hero-h1{font-size:clamp(30px,5.6vw,62px);line-height:1.04;letter-spacing:-.005em}
.hero-desc{margin:0;font-size:clamp(16px,1.3vw,19px);border-left:6px solid #000;padding-left:1rem;max-width:36ch}
.hero-more{align-self:flex-start;display:inline-flex;align-items:center;min-height:44px;padding:.2rem .1rem;font-weight:700;letter-spacing:.14em;font-size:16px;border-bottom:3px solid #000}
.hero-more:hover{background:#000;color:#fff}
.hero-fig{position:relative;margin:0;min-height:300px;overflow:hidden;background:#000;clip-path:polygon(11% 0,100% 0,100% 100%,0 100%)}
.hero-fig .slide{position:absolute;inset:0;display:block}
.hero-fig img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;filter:grayscale(1) contrast(1.05)}
.hero-fig.is-multi .slide{opacity:0;animation-name:herofade;animation-duration:var(--dur,21s);animation-timing-function:linear;animation-iteration-count:infinite}
@keyframes herofade{0%{opacity:0}3%{opacity:1}30%{opacity:1}37%{opacity:0}100%{opacity:0}}
.void{position:absolute;inset:0;background:repeating-linear-gradient(135deg,#000 0 14px,#fff 14px 28px)}
/* 主体 */
.shell{display:grid;grid-template-columns:minmax(170px,236px) 1fr;gap:clamp(20px,3vw,52px);max-width:1240px;margin:0 auto;padding:clamp(28px,4.5vw,58px) clamp(16px,4vw,40px);align-items:start}
.side{position:sticky;top:96px;border-top:3px solid #000;padding-top:.7rem}
.side-h{font-family:Karla,Helvetica,sans-serif;font-size:16px;letter-spacing:.2em;font-weight:700;margin:0 0 .4rem}
.side-h span{border-bottom:2px solid #000;padding-bottom:.1rem}
.side-list{list-style:none;margin:0;padding:0;counter-reset:s}
.side-list li{counter-increment:s;border-bottom:1px solid #000}
.side-list a{display:flex;align-items:center;gap:.55rem;min-height:44px;padding:.35rem .15rem;font-size:16px}
.side-list a::before{content:counter(s,decimal-leading-zero);font-size:14px;letter-spacing:.06em;font-variant-numeric:tabular-nums;color:#000;opacity:.55}
.side-list a:hover,.side-list a.on{background:#000;color:#fff}
.side-list a:hover::before,.side-list a.on::before{opacity:1}
.prose{min-width:0;max-width:72ch;padding-bottom:1rem}
.prose div{border-top:2px solid #000;padding:clamp(24px,3vw,42px) 0;scroll-margin-top:88px}
.prose div:first-child{border-top:0;padding-top:0}
.prose h2{font-size:clamp(23px,3.2vw,36px);line-height:1.15;margin:0 0 1rem}
.prose h2 span,.prose h3 span{display:inline;border-bottom:4px solid #000;padding-bottom:.08rem}
.prose h3{font-size:clamp(19px,2.1vw,24px);margin:1.9rem 0 .6rem}
.prose h3 span{border-bottom-width:2px}
.prose p{margin:0 0 1rem}
.prose ul,.prose ol{margin:0 0 1.1rem;padding-left:1.5rem}
.prose li{margin:.35rem 0}
.prose a{border-bottom:2px solid #000;font-weight:600}
.prose a:hover{background:#000;color:#fff}
.prose img{width:100%;height:auto;margin:1.2rem 0;border:2px solid #000;filter:grayscale(1)}
.prose blockquote{margin:1.4rem 0;padding:.15rem 0 .15rem 1.1rem;border-left:8px solid #000;font-size:18px}
.prose blockquote p:last-child{margin-bottom:0}
.prose strong{background:#000;color:#fff;padding:0 .22em}
.prose em{font-style:normal;border-bottom:2px dotted #000}
.prose code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:15px;background:#eee;padding:.1em .32em}
.prose table{width:100%;border-collapse:collapse;margin:1.2rem 0;font-size:16px}
.prose th,.prose td{border-bottom:1px solid #000;padding:.6rem .45rem;text-align:left;vertical-align:top}
.prose th{border-bottom:3px solid #000;letter-spacing:.06em}
.prose hr{border:0;border-top:2px solid #000;margin:2rem 0}
.prose time{font-variant-numeric:tabular-nums;font-weight:600;letter-spacing:.05em}
/* 页脚 */
.foot{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:clamp(20px,3vw,44px);background:#000;color:#fff;margin-top:clamp(34px,6vw,76px);padding:clamp(30px,5vw,58px) clamp(16px,4vw,40px) 0}
.foot a{color:#fff}
.foot-brand{font-size:clamp(24px,3.4vw,40px);line-height:1.06;margin:0 0 1.1rem}
.foot-brand span{display:inline;border-bottom:6px solid #fff;padding-bottom:.08rem}
.foot-btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 1.3rem;border:2px solid #fff;font-weight:700;letter-spacing:.1em}
.foot-btn:hover{background:#fff;color:#000}
.foot-h{font-family:Karla,Helvetica,sans-serif;font-size:16px;font-weight:700;letter-spacing:.18em;margin:0 0 .8rem}
.foot-h span{border-bottom:2px solid #fff;padding-bottom:.1rem}
.foot-list{list-style:none;margin:0;padding:0}
.foot-list a{display:inline-flex;align-items:center;min-height:42px;font-size:16px;border-bottom:1px solid transparent}
.foot-list a:hover{border-bottom-color:#fff}
.foot-kw{margin:0;font-size:16px;line-height:1.6;max-width:24ch}
.foot-bar{grid-column:1/-1;border-top:1px solid rgba(255,255,255,.4);margin-top:clamp(20px,3vw,34px);padding:1rem 0;text-align:center}
.copy{margin:0;font-size:16px;letter-spacing:.12em}
@media (max-width:1000px){
.shell{grid-template-columns:minmax(150px,200px) 1fr}
.hero-fig{clip-path:polygon(6% 0,100% 0,100% 100%,0 100%)}
}
@media (max-width:900px){
.topbar{position:static;grid-template-columns:1fr;gap:.45rem;padding:.6rem .8rem}
.topnav{grid-template-columns:1fr;gap:.2rem}
.brand{justify-self:center;border:0;padding:0;font-size:20px}
.brand:hover{background:transparent;color:#000;text-decoration:underline}
.menu{justify-content:center;flex-wrap:wrap;gap:.05rem}
.menu a{font-size:16px;padding:0 .45rem;font-weight:500}
.cta{width:100%}
.hero{grid-template-columns:1fr;min-height:0}
.hero-copy{padding:22px 16px 26px;max-width:none}
.hero-fig{clip-path:polygon(0 0,100% 0,100% 100%,0 100%);height:54vw;max-height:320px;min-height:200px}
.shell{grid-template-columns:1fr;gap:22px}
.side{position:static}
.side-list{display:grid;grid-template-columns:1fr 1fr;column-gap:1rem}
.prose{max-width:none}
.prose div{scroll-margin-top:14px}
.foot{grid-template-columns:1fr;padding-bottom:0}
.foot-kw{max-width:none}
}
@media (prefers-reduced-motion:reduce){
html{scroll-behavior:auto}
*{animation:none!important;transition:none!important}
.hero-fig.is-multi .slide:first-child{opacity:1}
}
button[aria-expanded]{min-width:44px;min-height:44px}