:root{
  --ink:#0F0F12;
  --red:#FF3D2E;
  --paper:#F2EDE4;
  --hair:rgba(242,237,228,.22);
}
*,*::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:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:17px;
  line-height:1.65;
  font-weight:400;
  overflow-x:hidden;
}
body.menu-open{overflow:hidden}
a{color:inherit}
a:focus-visible,button:focus-visible{outline:3px solid var(--red);outline-offset:2px}
img{max-width:100%}

/* 顶栏 */
.topbar{
  position:sticky;
  top:0;
  z-index:60;
  display:grid;
  grid-template-columns:1fr auto;
  align-items:center;
  gap:10px;
  padding:10px 16px 0;
  background:var(--ink);
  color:var(--paper);
  border-bottom:3px solid var(--red);
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  color:var(--paper);
  text-decoration:none;
  font-weight:800;
  font-size:18px;
  letter-spacing:-.02em;
}
.dot{width:12px;height:12px;background:var(--red);border-radius:2px;transform:rotate(45deg);flex:none}
.brand-t{overflow-wrap:anywhere}
.acts{display:flex;align-items:center;gap:10px}
.cta{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 16px;
  background:var(--red);
  color:var(--ink);
  font-weight:800;
  font-size:16px;
  text-decoration:none;
  border-radius:2px;
  transition:opacity .16s ease;
}
.cta:hover{opacity:.82}
.burger{
  width:44px;
  height:44px;
  padding:0 10px;
  display:inline-flex;
  flex-direction:column;
  justify-content:center;
  gap:5px;
  background:transparent;
  border:2px solid var(--paper);
  border-radius:2px;
  cursor:pointer;
}
.burger span{display:block;height:2px;width:100%;background:var(--paper);transition:transform .18s ease,opacity .18s ease}
.burger[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.anchors{
  grid-column:1/-1;
  margin-top:8px;
  border-top:1px solid var(--hair);
  overflow-x:auto;
  scrollbar-width:none;
}
.anchors::-webkit-scrollbar{display:none}
.anchors p{display:flex;margin:0;padding:0;white-space:nowrap}
.anchors a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 13px;
  color:var(--paper);
  font-weight:600;
  font-size:16px;
  text-decoration:none;
  opacity:.82;
  transition:color .16s ease,opacity .16s ease;
}
.anchors a:hover{color:var(--red);opacity:1}
.anchors a+a{border-left:1px solid var(--hair)}

/* 全屏遮罩菜单 */
.menu{
  position:fixed;
  inset:0;
  z-index:55;
  display:none;
  padding:120px 20px 32px;
  background:var(--ink);
  color:var(--paper);
  overflow-y:auto;
}
.menu.is-open{display:block}
.menu p{display:flex;flex-direction:column;margin:0}
.menu a{
  display:flex;
  align-items:center;
  min-height:56px;
  padding:12px 0;
  color:var(--paper);
  font-weight:800;
  font-size:clamp(1.4rem,7vw,2rem);
  letter-spacing:-.03em;
  text-decoration:none;
  border-bottom:1px solid var(--hair);
  transition:color .16s ease;
}
.menu a:hover{color:var(--red)}

/* 首屏 */
.hero{
  position:relative;
  overflow:hidden;
  min-height:70vh;
  display:flex;
  align-items:flex-end;
  background:var(--ink);
  color:var(--paper);
  padding:28px 20px 52px;
}
.band{
  position:absolute;
  left:-10%;
  right:-10%;
  top:32%;
  height:74px;
  background:var(--red);
  transform:skewY(-6deg);
  will-change:transform;
}
.hero-in{position:relative;width:100%;max-width:1200px;margin:0 auto;text-align:right}
.hero h1{
  margin:0;
  font-size:clamp(2.1rem,9.6vw,5.6rem);
  line-height:.98;
  font-weight:800;
  letter-spacing:-.045em;
  text-transform:uppercase;
  overflow-wrap:anywhere;
}

/* 主体 */
.shell{
  max-width:1200px;
  margin:0 auto;
  padding:52px 20px 64px;
  display:grid;
  grid-template-columns:264px minmax(0,1fr);
  gap:36px;
  align-items:start;
}
.rail{
  position:sticky;
  top:124px;
  border:2px solid var(--ink);
  border-radius:28px;
  padding:22px;
  background:var(--paper);
}
.rail h2{
  margin:0 0 8px;
  font-size:1.25rem;
  line-height:1.15;
  font-weight:800;
  letter-spacing:-.02em;
  overflow-wrap:anywhere;
}
.subtitle{margin:0 0 18px;font-size:16px;line-height:1.55;opacity:.72}
.rail-nav p{display:flex;flex-direction:column;margin:0}
.rail-nav a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:6px 0;
  font-size:16px;
  font-weight:600;
  text-decoration:none;
  border-top:1px solid rgba(15,15,18,.14);
  transition:color .16s ease;
}
.rail-nav a::before{content:"";flex:none;width:10px;height:2px;margin-right:10px;background:var(--red)}
.rail-nav a:hover{color:var(--red)}

.prose{min-width:0}
.prose>div{
  background:var(--paper);
  border:2px solid var(--ink);
  border-radius:28px;
  padding:clamp(20px,3vw,38px);
  margin-bottom:26px;
}
.prose [id]{scroll-margin-top:132px}
.prose h2{
  margin:0 0 12px;
  font-size:clamp(1.4rem,3.6vw,2.05rem);
  line-height:1.14;
  font-weight:800;
  letter-spacing:-.03em;
  overflow-wrap:anywhere;
}
.prose h3,.prose h4{margin:26px 0 10px;font-size:1.15rem;line-height:1.3;font-weight:800;letter-spacing:-.01em}
.prose p{margin:0 0 16px}
.prose a{color:var(--red);font-weight:600;text-decoration:underline;text-underline-offset:3px}
.prose ul,.prose ol{margin:0 0 16px;padding-left:1.3em}
.prose li{margin-bottom:8px}
.prose blockquote{margin:0 0 18px;padding:12px 18px;border-left:6px solid var(--red);font-weight:600}
.prose figure{margin:0 0 20px}
.prose figure img{display:block;width:100%;height:auto;border-radius:20px}
.prose figcaption{margin-top:8px;font-size:16px;opacity:.7}
.prose hr{border:0;border-top:2px solid var(--ink);margin:26px 0}
.prose table{width:100%;border-collapse:collapse;font-size:16px}
.prose th,.prose td{border:1px solid var(--ink);padding:9px 11px;text-align:left;vertical-align:top}
.prose th{background:rgba(15,15,18,.06);font-weight:800}
.prose code{
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  font-size:.94em;
  background:rgba(15,15,18,.08);
  padding:1px 5px;
  border-radius:2px;
}

/* 页脚 */
.foot{
  display:grid;
  grid-template-columns:1.4fr 1fr auto;
  gap:22px;
  align-items:start;
  padding:44px 20px 28px;
  background:var(--ink);
  color:var(--paper);
  border-top:8px solid var(--red);
}
.foot-brand{margin:0;font-size:clamp(2rem,7.4vw,3.6rem);line-height:.94;font-weight:800;letter-spacing:-.05em;color:var(--red);overflow-wrap:anywhere}
.foot-links{margin:0;display:flex;flex-wrap:wrap;gap:0 16px;font-size:16px}
.foot-links a{display:inline-flex;align-items:center;min-height:40px;color:var(--paper);text-decoration:none;font-weight:600;opacity:.86;transition:color .16s ease,opacity .16s ease}
.foot-links a:hover{color:var(--red);opacity:1}
.foot small{justify-self:end;display:inline-flex;align-items:center;min-height:40px;font-size:16px;opacity:.78;text-align:right}

/* 入场动效 */
.js .prose>div,.js .rail{transition:opacity .42s ease,transform .42s ease}
.js .prose>div,.js .rail{opacity:0;transform:translateY(16px)}
.js .prose>div.in,.js .rail.in{opacity:1;transform:none}

@media (max-width:900px){
  .shell{grid-template-columns:1fr;gap:26px;padding:34px 16px 48px}
  .rail{position:static;border-radius:24px;padding:18px}
  .rail-nav p{flex-direction:row;flex-wrap:wrap;gap:0 8px}
  .rail-nav a{border-top:0;padding-right:10px;font-size:16px}
  .prose [id]{scroll-margin-top:118px}
  .prose>div{border-radius:24px;padding:20px}
  .foot{grid-template-columns:1fr;gap:14px;padding:34px 16px 24px}
  .foot small{justify-self:start;text-align:left}
  .hero{min-height:62vh;padding:24px 16px 44px}
  .band{height:56px;top:38%}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .js .prose>div,.js .rail{opacity:1;transform:none;transition:none}
  .band{transform:skewY(-6deg)!important}
}

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