@import url('https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&display=swap');

:root{
  --paper:#ffffff;
  --ash:#f5f5f5;
  --ink:#1f1f1f;
  --soft:#4a4a4a;
  --hair:rgba(31,31,31,.16);
  --sh1:2px 2px 0 rgba(31,31,31,.85);
}

*,*::before,*::after{box-sizing:border-box}

html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:"Space Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:17px;
  line-height:1.85;
  letter-spacing:.01em;
}

a{color:var(--ink)}
a:focus-visible,
button:focus-visible,
input:focus-visible{outline:3px solid var(--ink);outline-offset:3px}

.skip{
  position:absolute;left:-9999px;top:0;z-index:99;
  background:var(--ink);color:var(--paper);
  padding:10px 16px;border-radius:0 0 8px 0;text-decoration:none;
}
.skip:focus{left:0;top:0}

/* 顶栏：品牌独占一行，菜单行在下 */
.top{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.9);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border-bottom:2px solid var(--ink);
}
.brandrow{
  max-width:1180px;margin:0 auto;
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  padding:11px 18px;
}
.brand{
  display:inline-flex;align-items:center;gap:9px;
  min-height:40px;text-decoration:none;
  font-size:18px;font-weight:700;letter-spacing:-.01em;
}
.mark{
  width:20px;height:20px;flex:none;
  border:2px solid var(--ink);border-radius:5px;
  background:var(--ink);
  box-shadow:3px 3px 0 rgba(31,31,31,.28);
}
.sform{
  display:flex;align-items:center;overflow:hidden;
  border:2px solid var(--ink);border-radius:10px;
  background:var(--paper);box-shadow:var(--sh1);
}
.sinput{
  width:150px;min-height:40px;padding:8px 10px;
  border:0;background:transparent;color:var(--ink);
  font:inherit;font-size:16px;
}
.sinput:focus{outline:none;background:var(--ash)}
.sbtn{
  min-height:40px;padding:0 13px;
  border:0;border-left:2px solid var(--ink);
  background:var(--ash);color:var(--ink);
  font:inherit;font-size:16px;cursor:pointer;
}
.sbtn:hover{background:var(--ink);color:var(--paper)}

.menu{max-width:1180px;margin:0 auto;padding:0 18px 11px}
.menu p{margin:0;display:flex;flex-wrap:wrap;gap:7px}
.menu a{
  display:inline-flex;align-items:center;
  min-height:40px;padding:5px 13px;
  border:2px solid var(--ink);border-radius:8px;
  background:var(--ash);color:var(--ink);
  font-size:16px;line-height:1.2;text-decoration:none;
  transition:transform .14s,box-shadow .14s,background .14s,color .14s;
}
.menu a:hover{
  background:var(--ink);color:var(--paper);
  transform:translate(-1px,-1px);
  box-shadow:3px 3px 0 rgba(31,31,31,.35);
}
.menu a:first-child{background:var(--ink);color:var(--paper)}

/* 主栅格：侧栏在左，正文在右 */
.dossier{
  max-width:1180px;margin:0 auto;padding:20px 18px 44px;
  display:grid;grid-template-columns:236px minmax(0,1fr);
  column-gap:26px;align-items:start;
}

/* 首屏 */
.hero{
  grid-column:1 / -1;grid-row:1;
  position:relative;z-index:2;overflow:hidden;
  display:grid;grid-template-columns:1.02fr .98fr;align-items:center;gap:20px;
  min-height:70vh;
  padding:48px 32px 54px;margin:0 0 30px;
  border:2px solid var(--ink);border-radius:10px;
  background-color:var(--ash);
  background-image:radial-gradient(rgba(31,31,31,.15) 1.2px,transparent 1.2px);
  background-size:15px 15px;
  box-shadow:12px 12px 0 rgba(31,31,31,.1);
}
.hero-copy{grid-column:2;grid-row:1;position:relative;z-index:2;text-align:right}
.hero h1{
  margin:0 0 14px;
  font-size:clamp(28px,5.2vw,52px);
  line-height:1.28;letter-spacing:-.02em;
  text-wrap:balance;
}
.hero-desc{
  margin:0 0 0 auto;max-width:36ch;
  font-size:16px;line-height:1.85;color:var(--soft);
}
.hero-art{
  grid-column:1;grid-row:1;
  position:relative;z-index:1;margin:0;
  height:min(320px,44vh);min-height:200px;
}
.hero-img{
  width:100%;height:100%;object-fit:cover;display:block;
  border:2px solid var(--ink);border-radius:10px;
  box-shadow:10px 10px 0 rgba(31,31,31,.14);
}
.plate{position:absolute;border:2px solid var(--ink);border-radius:10px;display:block}
.p1{inset:14% 30% 24% 6%;background:var(--paper);transform:rotate(-6deg);box-shadow:10px 10px 0 rgba(31,31,31,.12)}
.p2{inset:24% 14% 14% 24%;background:var(--ash);box-shadow:10px 10px 0 rgba(31,31,31,.1);animation:drift 9s ease-in-out infinite}
.p3{inset:38% 30% 30% 16%;background:var(--ink);box-shadow:10px 10px 0 rgba(31,31,31,.18);animation:drift 9s ease-in-out infinite reverse}
@keyframes drift{
  0%,100%{transform:rotate(4deg) translateY(0)}
  50%{transform:rotate(-3deg) translateY(-10px)}
}

/* 左侧栏 */
.rail{
  grid-column:1;grid-row:2 / span 40;
  position:sticky;top:132px;align-self:start;z-index:3;
  padding:14px 13px;
  border:2px solid var(--ink);border-radius:10px;
  background:var(--ash);
  box-shadow:8px 8px 0 rgba(31,31,31,.13);
}
.rail-t{
  margin:0 0 10px;padding-bottom:9px;
  font-size:15px;letter-spacing:.16em;
  border-bottom:2px solid var(--ink);
}
.rail-t > span{display:inline-block}
.rail-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column}
.rail-list li a{
  display:flex;align-items:center;gap:8px;
  min-height:40px;padding:6px 4px;
  font-size:16px;line-height:1.4;text-decoration:none;
  border-bottom:1px dashed var(--hair);
  transition:transform .14s;
}
.rail-list li:last-child a{border-bottom:0}
.rail-list a:hover{transform:translateX(2px)}
.rail-list .dot{
  width:7px;height:7px;flex:none;
  border:1.5px solid var(--ink);border-radius:50%;
}
.rail-list a:hover .dot{background:var(--ink)}

/* 正文区块 */
.dossier > section[id]{
  grid-column:2;
  position:relative;z-index:1;
  margin:0 0 26px;padding:24px 26px 28px;
  border:2px solid var(--ink);border-radius:10px;
  background:var(--paper);
  scroll-margin-top:148px;
}
.dossier > section[id]::before{
  content:"";position:absolute;z-index:-1;
  inset:9px -9px -9px 9px;
  border:2px solid rgba(31,31,31,.3);border-radius:10px;
  pointer-events:none;
}

.dossier h2{
  margin:0 0 16px;
  font-size:clamp(21px,3.4vw,28px);
  line-height:1.4;letter-spacing:-.01em;
}
.dossier h2 > span{display:inline-block;padding-bottom:5px;border-bottom:3px solid var(--ink)}
.dossier h3{margin:26px 0 10px;font-size:19px;line-height:1.5}
.dossier h3 > span{display:inline-block;padding-bottom:3px;border-bottom:2px solid rgba(31,31,31,.4)}
.dossier p{margin:0 0 16px}
.dossier ul,.dossier ol{margin:0 0 16px;padding-left:1.3em}
.dossier li{margin:0 0 8px}
.dossier blockquote{
  margin:20px 0;padding:12px 16px;
  background:var(--ash);
  border-left:5px solid var(--ink);
  border-radius:0 10px 10px 0;
}
.dossier blockquote p:last-child{margin:0}
.dossier figure{margin:20px 0}
.dossier img{
  display:block;max-width:100%;height:auto;
  border:2px solid var(--ink);border-radius:10px;
}
.dossier figcaption{margin-top:8px;font-size:15px;color:var(--soft)}
.dossier table{width:100%;border-collapse:collapse;margin:0 0 18px;font-size:16px}
.dossier th,.dossier td{border:2px solid var(--ink);padding:8px 10px;text-align:left;vertical-align:top}
.dossier th{background:var(--ash)}
.dossier code{
  padding:1px 5px;font-size:15px;
  background:var(--ash);border:1px solid var(--hair);border-radius:5px;
}
.dossier a{text-decoration:underline;text-underline-offset:3px}
.dossier a:hover{background:var(--ink);color:var(--paper);text-decoration:none}

/* 页脚：四栏，无顶部块 */
.foot{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  gap:16px 18px;
  padding:30px max(18px,calc((100% - 1180px) / 2)) 24px;
  border-top:2px solid var(--ink);
  background:var(--ash);
}
.foot p{margin:0;font-size:15px;line-height:1.7}
.foot a{
  display:inline-block;min-height:40px;padding:7px 0;
  color:var(--ink);text-decoration:none;
  border-bottom:1px solid rgba(31,31,31,.35);
}
.foot a:hover{background:var(--ink);color:var(--paper)}
.f1{font-size:17px;font-weight:700;letter-spacing:-.01em}
.f2,.f3{display:flex;flex-direction:column;align-items:flex-start}
.f4{text-align:right}
.foot small{
  grid-column:1 / -1;
  padding-top:12px;
  font-size:15px;color:var(--soft);
  border-top:1px dashed var(--hair);
}

/* 滚动显现 */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .5s ease,transform .5s ease}
.reveal.in{opacity:1;transform:none}

@media (max-width:880px){
  body{font-size:16px}
  .brandrow{padding:10px 14px}
  .menu{padding:0 14px 10px}
  .dossier{display:block;padding:16px 14px 34px}
  .hero{
    grid-template-columns:1fr;min-height:0;
    padding:28px 18px 32px;margin-bottom:22px;
    box-shadow:8px 8px 0 rgba(31,31,31,.1);
  }
  .hero-copy{grid-column:1;grid-row:1}
  .hero h1{font-size:clamp(25px,7.6vw,34px)}
  .hero-art{grid-column:1;grid-row:2;height:168px;min-height:0;margin-top:18px}
  .rail{position:static;margin:0 0 22px;box-shadow:5px 5px 0 rgba(31,31,31,.12)}
  .rail-list{flex-direction:row;flex-wrap:wrap;gap:6px}
  .rail-list li a{border:1.5px solid var(--hair);border-radius:8px;padding:4px 9px;font-size:15px}
  .rail-list li:last-child a{border-bottom:1.5px solid var(--hair)}
  .dossier > section[id]{padding:20px 16px 22px;scroll-margin-top:122px}
  .dossier > section[id]::before{inset:7px -7px -7px 7px}
  .sinput{width:104px}
  .foot{grid-template-columns:1fr 1fr;padding:24px 14px 20px;gap:12px}
  .f4{text-align:left}
}

@media (max-width:420px){
  .brand{font-size:16px}
  .brandrow{gap:8px}
  .menu a{font-size:15px;padding:4px 10px}
  .sinput{width:82px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .reveal{opacity:1 !important;transform:none !important}
}

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