*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:#fff;color:#000;font:17px/1.65 "Source Sans 3","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img,svg{display:block;max-width:100%;height:auto}
a{color:#000}
h1,h2,h3,h4{font-family:"Bebas Neue","Source Sans 3","PingFang SC","Microsoft YaHei",system-ui,sans-serif;font-weight:900;line-height:1.05;letter-spacing:-.035em;margin:0 0 .55em}
h1{font-size:clamp(2.4rem,8.6vw,5.6rem);line-height:.97}
h2{font-size:clamp(1.8rem,5.2vw,3.2rem)}
h3{font-size:clamp(1.25rem,3vw,1.8rem)}
p,ul,ol,figure{margin:0 0 1.05em}
:focus-visible{outline:3px solid #000;outline-offset:3px}
.sr{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip{position:absolute;left:-9999px;top:0;z-index:999;background:#000;color:#fff;padding:.75rem 1.1rem;font-weight:700;text-decoration:none}
.skip:focus{left:.6rem;top:.6rem}

/* 顶栏 */
.bar{position:sticky;top:0;z-index:60;display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.45rem clamp(.8rem,3vw,1.6rem);background:#fff;border-bottom:2px solid #000}
.brand{display:inline-flex;align-items:center;min-height:44px;padding:.4rem .2rem;font-weight:700;font-size:1.05rem;letter-spacing:-.02em;text-decoration:none;white-space:nowrap}
.nav ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;align-items:center;gap:.1rem}
.nav li{position:relative}
.nav ol a{display:inline-flex;align-items:center;min-height:44px;padding:.35rem .68rem;font-size:.95rem;font-weight:600;text-decoration:none;border-radius:999px;transition:background .18s ease,color .18s ease}
.nav ol a:hover,.nav ol a:focus-visible{background:#000;color:#fff}
.nav .drop{position:absolute;right:0;top:100%;min-width:196px;display:flex;flex-direction:column;gap:.1rem;margin:0;padding:.4rem;list-style:none;background:#000;border-radius:18px;opacity:0;visibility:hidden;transform:translateY(-6px);transition:opacity .2s ease,transform .2s ease,visibility .2s}
.nav .has-menu:hover .drop,.nav .has-menu:focus-within .drop{opacity:1;visibility:visible;transform:none}
.nav .drop a{color:#fff;border-radius:12px}
.nav .drop a:hover,.nav .drop a:focus-visible{background:#fff;color:#000}

/* 主视觉 */
.hero{position:relative;overflow:hidden;background:#000;color:#fff;border-bottom:2px solid #000;min-height:45vh;display:flex;align-items:center;padding:clamp(2rem,7vw,3.6rem) clamp(1rem,3vw,2rem)}
.ghost{position:absolute;right:-1.5vw;bottom:-.28em;margin:0;font-family:"Bebas Neue","Source Sans 3","PingFang SC",system-ui,sans-serif;font-weight:900;font-size:clamp(4.4rem,19vw,15rem);line-height:.78;letter-spacing:-.05em;color:transparent;-webkit-text-stroke:1.4px rgba(255,255,255,.3);white-space:nowrap;pointer-events:none;user-select:none}
.hero-in{position:relative;z-index:2;width:100%;max-width:1200px;margin:0 auto;display:flex;align-items:center;gap:clamp(.9rem,2.6vw,1.7rem)}
.mark{flex:0 0 auto;width:clamp(42px,7vw,74px);color:#fff}
.mark img,.mark svg{width:100%}
.hero-txt{min-width:0}
.hero h1{color:#fff;margin:0}
.lede{margin:.75rem 0 0;max-width:44ch;font-size:clamp(1rem,2.2vw,1.25rem);line-height:1.55;color:rgba(255,255,255,.84)}

/* 版心 */
.wrap{max-width:1200px;margin:0 auto;padding:clamp(2.2rem,6vw,4.6rem) clamp(1rem,3vw,2rem) clamp(3rem,8vw,6rem);display:grid;grid-template-columns:236px minmax(0,1fr);gap:clamp(1.6rem,4vw,3.4rem);align-items:start}
.body{min-width:0}
.prose{max-width:74ch}
.prose>p:first-child,.prose>article:first-child{margin-top:0}

/* 侧栏 */
.side{position:sticky;top:calc(56px + 1.2rem);align-self:start}
.side small,.fcol small{display:block;font-size:.72rem;font-weight:700;letter-spacing:.3em;text-transform:uppercase;margin-bottom:.35rem}
.side h2{font-size:clamp(1.5rem,3.4vw,2rem);margin:0 0 1rem;line-height:1}
.jump{list-style:none;margin:0;padding:0;counter-reset:jump}
.jump li{margin-bottom:.5rem}
.jump li a{display:flex;align-items:center;gap:.6rem;min-height:44px;padding:.5rem .85rem;border:1.5px solid #000;border-radius:18px;text-decoration:none;font-weight:600;font-size:.95rem;box-shadow:0 7px 20px rgba(0,0,0,.09);transition:transform .2s ease,background .2s ease,color .2s ease,box-shadow .2s ease}
.jump li a::before{counter-increment:jump;content:counter(jump,decimal-leading-zero);font-size:.76rem;font-weight:700;letter-spacing:.06em;opacity:.55}
.jump li a:hover,.jump li a:focus-visible{background:#000;color:#fff;transform:translate(-2px,-2px);box-shadow:0 11px 26px rgba(0,0,0,.22)}

/* 正文块 */
.prose small{display:block;font-size:.74rem;font-weight:700;letter-spacing:.3em;text-transform:uppercase;margin-bottom:.3rem;opacity:.6}
.prose article[id]{margin-top:clamp(2.6rem,6vw,4.4rem);padding-top:clamp(1.4rem,3vw,2rem);border-top:2px solid #000;scroll-margin-top:96px}
.prose>article:first-child{border-top:0;padding-top:0;margin-top:0}
.prose h2,.prose h3{margin-top:0}
.prose ul,.prose ol{padding-left:1.3rem}
.prose li{margin-bottom:.45rem}
.prose a{text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:3px}
.prose a:hover{background:#000;color:#fff;text-decoration:none}
.prose strong{font-weight:700}
.prose blockquote{margin:0 0 1.2em;padding:.2rem 0 .2rem 1.2rem;border-left:6px solid #000;font-size:1.05rem}
.prose hr{border:0;border-top:2px solid #000;margin:2.4rem 0}
.stamp{font-size:.9rem;font-weight:600;letter-spacing:.04em;opacity:.7}
.stamp i{margin:0 .5em;font-style:normal}
.lede-ink{color:#000;margin-bottom:1.6rem}
.mark-in{margin:0 0 1rem;width:52px}

/* 页脚 */
.foot{background:#000;color:#fff;padding:clamp(2.6rem,6vw,4rem) clamp(1rem,3vw,2rem) 1.4rem}
.foot-grid{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(1.4rem,4vw,3rem)}
.fcol small,.foot small{color:rgba(255,255,255,.55)}
.foot address{font-style:normal;font-weight:700;font-size:1.12rem;line-height:1.55}
.foot .host{font-weight:400;opacity:.7;word-break:break-all}
.sub{display:flex;flex-direction:column;gap:.55rem;max-width:260px}
.sub input{width:100%;min-height:48px;padding:.7rem .95rem;font:inherit;color:#fff;background:#000;border:1.5px solid #fff;border-radius:18px}
.sub input::placeholder{color:rgba(255,255,255,.6)}
.sub button{min-height:48px;padding:.7rem 1rem;font:inherit;font-weight:700;color:#000;background:#fff;border:0;border-radius:18px;cursor:pointer;transition:transform .18s ease,background .18s ease}
.sub button:hover{transform:translateY(-2px);background:#e6e6e6}
.foot-links{list-style:none;margin:0;padding:0}
.foot-links a{display:inline-flex;align-items:center;min-height:40px;padding:.15rem 0;color:#fff;text-decoration:none;border-bottom:1.5px solid transparent}
.foot-links a:hover,.foot-links a:focus-visible{border-bottom-color:#fff}
.foot a:focus-visible{outline-color:#fff}
.foot-bot{max-width:1200px;margin:2.4rem auto 0;padding-top:1.2rem;border-top:1px solid rgba(255,255,255,.3);display:flex;flex-wrap:wrap;gap:.4rem 1.2rem;align-items:center;justify-content:center;text-align:center;font-size:.86rem}
.foot-bot p{margin:0;opacity:.75}
.foot-bot .top{display:inline-flex;align-items:center;min-height:40px;padding:0 .4rem;color:#fff;text-decoration:none;border-bottom:1.5px solid transparent}
.foot-bot .top:hover{border-bottom-color:#fff}

/* 动效 */
@media (prefers-reduced-motion:no-preference){
  .hero h1,.lede{animation:rise .6s both}
  .lede{animation-delay:.08s}
  .jump li{animation:rise .5s both}
  .jump li:nth-child(2){animation-delay:.05s}
  .jump li:nth-child(3){animation-delay:.1s}
  .jump li:nth-child(4){animation-delay:.15s}
  .jump li:nth-child(5){animation-delay:.2s}
  .jump li:nth-child(6){animation-delay:.25s}
  .jump li:nth-child(7){animation-delay:.3s}
  @keyframes rise{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .jump li a,.sub button{transition:none}
}

/* 窄屏 */
@media (max-width:860px){
  .bar{position:static;flex-direction:column;align-items:stretch;gap:.2rem;padding-bottom:.6rem}
  .brand{font-size:1.15rem}
  .nav ol{aargin-top:.1rem;gap:.15rem}
  .nav ol a{font-size:.9rem;padding:.3rem .55rem}
  .nav .drop{position:static;opacity:1;visibility:visible;transform:none;background:transparent;border-radius:0;padding:0 0 .2rem .7rem;margin-top:.15rem;flex-direction:row;flex-wrap:wrap;gap:.15rem}
  .nav .drop a{color:#000}
  .nav .drop a:hover,.nav .drop a:focus-visible{background:#000;color:#fff}
  .hero{min-height:0;padding:2.2rem 1rem 2.6rem}
  .hero-in{align-items:flex-start}
  .ghost{bottom:-.2em;right:-4vw}
  .wrap{grid-template-columns:minmax(0,1fr);gap:2rem;padding:2rem 1rem 3rem}
  .side{position:static}
  .jump{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.5rem}
  .jump li{margin:0}
  .jump li a{font-size:.86rem;padding:.4rem .6rem;gap:.4rem;box-shadow:0 5px 14px rgba(0,0,0,.08)}
  .foot-grid{grid-template-columns:minmax(0,1fr);gap:1.8rem}
  .prose article[id]{scroll-margin-top:12px}
}
@media (max-width:420px){
  body{font-size:16px}
  .jump{grid-template-columns:minmax(0,1fr)}
}

button[aria-expanded]{min-width:44px;min-height:44px}