:root{
  --ink:#000;
  --blue:#3bb1ff;
  --red:#ff5252;
  --paper:#fff;
  --sh:5px 5px 0 #000;
  --ln:3px solid #000;
}
*,*::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:"Montserrat","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  font-size:17px;
  line-height:1.7;
  font-weight:400;
  overflow-x:hidden;
}
img{max-width:100%}
a{color:inherit}
menu{margin:0;padding:0;list-style:none}
button,input{font:inherit;color:inherit}
h1,h2,h3,h4{font-family:"Cormorant","Montserrat","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;line-height:1.15;font-weight:700}

/* ---------- 顶栏：品牌行 + 菜单行 ---------- */
.top{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--paper);
  border-bottom:var(--ln);
}
.top-row{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:12px;
  padding:10px clamp(12px,3vw,28px);
  border-bottom:3px solid var(--ink);
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:46px;
  padding:5px 16px 5px 6px;
  background:var(--blue);
  border:var(--ln);
  box-shadow:var(--sh);
  text-decoration:none;
  transition:transform .12s ease, box-shadow .12s ease;
}
.brand:hover,.brand:focus-visible{transform:translate(-2px,-2px);box-shadow:8px 8px 0 #000}
.brand-logo{width:34px;height:34px;object-fit:cover;border:3px solid var(--ink);background:#fff;display:block}
.brand-txt{font-size:22px;font-weight:700;letter-spacing:.02em}
.tools{margin-left:auto;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.finder{display:flex;border:var(--ln);background:#fff;box-shadow:var(--sh)}
.finder input{
  border:0;
  background:transparent;
  min-height:44px;
  padding:0 12px;
  width:170px;
  max-width:40vw;
  outline-offset:3px;
}
.finder button{
  border:0;
  border-left:3px solid var(--ink);
  background:var(--red);
  min-height:44px;
  padding:0 15px;
  font-weight:700;
  cursor:pointer;
  letter-spacing:.06em;
}
.finder button:hover{background:var(--blue)}
.pop{position:relative}
.pop summary{
  list-style:none;
  display:inline-flex;
  align-items:center;
  min-height:46px;
  padding:0 16px;
  border:var(--ln);
  background:var(--blue);
  box-shadow:var(--sh);
  font-weight:700;
  cursor:pointer;
  letter-spacing:.06em;
}
.pop summary::-webkit-details-marker{display:none}
.pop summary::after{content:"＋";margin-left:8px;font-weight:700}
.pop[open] summary{background:var(--red)}
.pop-menu{
  position:absolute;
  right:0;
  top:calc(100% + 10px);
  width:min(258px,84vw);
  padding:6px;
  background:#fff;
  border:var(--ln);
  box-shadow:var(--sh);
  z-index:90;
}
.pop-menu li + li{border-top:2px solid var(--ink)}
.pop-a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:0 12px;
  text-decoration:none;
  font-weight:600;
}
.pop-a:hover,.pop-a:focus-visible{background:var(--blue)}
.strip{padding:8px clamp(12px,3vw,28px) 10px}
.strip-menu{display:flex;flex-wrap:wrap;gap:6px}
.strip-a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:0 11px;
  border:2px solid var(--ink);
  background:#fff;
  text-decoration:none;
  font-size:16px;
  font-weight:600;
  transition:background .12s ease, transform .12s ease;
}
.strip-a:hover,.strip-a:focus-visible{background:var(--blue);transform:translate(-1px,-1px)}

/* ---------- Hero ---------- */
.hero{
  position:relative;
  min-height:92svh;
  display:flex;
  align-items:center;
  overflow:hidden;
  background:var(--blue);
  border-bottom:var(--ln);
}
.hero-fig{
  position:absolute;
  inset:0;
  margin:0;
  overflow:hidden;
}
.hero-img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
  transform:scale(1.06);
}
.hero-fig::after{
  content:"";
  position:absolute;
  inset:0;
  background:rgba(0,0,0,.44);
}
.hero-fig figcaption{
  position:absolute;
  z-index:3;
  left:clamp(16px,4vw,44px);
  bottom:clamp(20px,5vw,52px);
  background:var(--red);
  border:var(--ln);
  box-shadow:var(--sh);
  padding:8px 16px;
  font-size:16px;
  font-weight:700;
  letter-spacing:.04em;
  line-height:1.4;
  max-width:min(78vw,420px);
}
.hero-copy{
  position:relative;
  z-index:2;
  width:100%;
  max-width:1180px;
  margin:0 auto;
  padding:clamp(72px,12vw,120px) clamp(16px,4vw,44px) clamp(72px,12vw,120px);
  text-align:left;
}
.hero h1{
  margin:0;
  font-size:clamp(38px,8.2vw,94px);
  font-weight:700;
  line-height:1.02;
  letter-spacing:.005em;
  color:#fff;
  text-shadow:4px 4px 0 #000;
  max-width:16em;
}

/* ---------- 主体网格：aside 在左 ---------- */
.stage{
  display:grid;
  grid-template-columns:minmax(180px,224px) minmax(0,1fr);
  gap:clamp(20px,3vw,42px);
  align-items:start;
  max-width:1180px;
  margin:0 auto;
  padding:clamp(26px,4vw,54px) clamp(14px,3vw,28px) 70px;
}
.rail{
  position:sticky;
  top:172px;
  padding:16px;
  background:#fff;
  border:var(--ln);
  box-shadow:var(--sh);
  border-radius:18px;
}
.rail-h{
  margin:0 0 8px;
  font-size:19px;
  letter-spacing:.16em;
}
.rail-line{
  border:0;
  border-top:3px solid var(--ink);
  margin:0 0 12px;
}
.rail-menu li{margin-bottom:6px}
.rail-a{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:0 8px;
  font-size:16px;
  font-weight:600;
  text-decoration:none;
  border:2px solid transparent;
  border-bottom:2px solid var(--ink);
  transition:background .12s ease, border-color .12s ease;
}
.rail-a:hover,.rail-a:focus-visible{background:var(--blue);border-color:var(--ink)}
.to-top{
  width:100%;
  min-height:44px;
  margin-top:16px;
  border:var(--ln);
  background:var(--red);
  box-shadow:var(--sh);
  font-weight:700;
  letter-spacing:.08em;
  cursor:pointer;
}
.to-top:hover{background:var(--blue)}

/* ---------- 正文 ---------- */
.body-col{min-width:0}
.body-col > article{
  padding:34px 0 44px;
  border-top:3px solid var(--ink);
  scroll-margin-top:180px;
}
.body-col > article:first-child{border-top:0;padding-top:0}
.body-col h2{
  font-size:clamp(26px,3.6vw,36px);
  margin:0 0 10px;
  letter-spacing:.01em;
}
.body-col h3{font-size:22px;margin:26px 0 8px}
.body-col h2 + hr,.body-col h3 + hr{
  border:0;
  height:0;
  border-top:3px solid var(--ink);
  margin:0 0 20px;
}
.body-col hr{border:0;border-top:3px solid var(--ink);margin:24px 0}
.body-col p{margin:0 0 16px}
.body-col ul,.body-col ol{padding-left:24px;margin:0 0 18px}
.body-col li{margin-bottom:8px}
.body-col li::marker{color:var(--red);font-weight:700}
.body-col strong{background:#cfeeff;padding:0 4px;font-weight:700}
.body-col a{
  text-decoration:underline;
  text-decoration-thickness:3px;
  text-decoration-color:var(--red);
  text-underline-offset:3px;
}
.body-col blockquote{
  margin:0 0 20px;
  padding:16px 18px;
  border:var(--ln);
  border-left:12px solid var(--red);
  border-radius:18px;
  box-shadow:var(--sh);
  background:#fff;
}
.body-col blockquote p:last-child{margin:0}
.body-col figure{
  margin:0 0 20px;
  border:var(--ln);
  border-radius:18px;
  box-shadow:var(--sh);
  overflow:hidden;
  background:#fff;
}
.body-col figure img{display:block;width:100%;height:auto}
.body-col figcaption{
  font-size:16px;
  padding:9px 12px;
  border-top:3px solid var(--ink);
  background:var(--blue);
}
.body-col table{
  display:block;
  overflow-x:auto;
  width:100%;
  border-collapse:collapse;
  font-size:16px;
  margin:0 0 20px;
}
.body-col th,.body-col td{border:2px solid var(--ink);padding:9px 11px;text-align:left}
.body-col th{background:var(--blue)}
.body-col .is-hit,
.body-col > article.is-hit{
  background:#eef8ff;
  outline:3px dashed var(--red);
  outline-offset:6px;
}

/* ---------- 页脚 ---------- */
.foot{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding:18px clamp(12px,3vw,28px);
  border-top:3px solid var(--ink);
  background:var(--ink);
  color:#fff;
}
.foot-brand a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 14px;
  border:3px solid #fff;
  box-shadow:5px 5px 0 #fff;
  font-size:19px;
  font-weight:700;
  text-decoration:none;
  letter-spacing:.03em;
}
.foot-brand a:hover{background:var(--blue);color:#000;border-color:#000;box-shadow:5px 5px 0 var(--red)}
.foot-menu{display:flex;flex-wrap:wrap;gap:5px}
.foot-a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:0 10px;
  font-size:16px;
  text-decoration:none;
  border:2px solid rgba(255,255,255,.4);
}
.foot-a:hover,.foot-a:focus-visible{background:var(--red);color:#000;border-color:#000}
.foot-copy{font-size:16px;letter-spacing:.08em}

/* ---------- 窄屏 ---------- */
@media (max-width:880px){
  .stage{grid-template-columns:minmax(0,1fr);gap:22px}
  .rail{position:static;top:auto}
  .rail-menu{display:flex;flex-wrap:wrap;gap:6px}
  .rail-menu li{margin-bottom:0}
  .rail-a{border:2px solid var(--ink);border-radius:10px;padding:0 10px}
  .to-top{margin-top:14px}
  .tools{width:100%;margin-left:0}
  .finder{flex:1 1 150px}
  .finder input{width:100%;max-width:none;flex:1}
  .hero{min-height:80svh}
  .hero h1{font-size:clamp(32px,9.6vw,58px)}
  .body-col > article{scroll-margin-top:210px}
}
@media (max-width:520px){
  body{font-size:16px}
  .brand-txt{font-size:20px}
  .foot{justify-content:flex-start}
  .foot-copy{width:100%}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition:none!important;animation:none!important}
  .hero-img{transform:none!important}
}

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