:root{
  --ink:#1c1726;
  --ink2:#2b2438;
  --p1:#6514ff;
  --p2:#bf00ff;
  --paper:#f2edff;
  --line:rgba(242,237,255,.22);
  --r:10px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;overflow-x:hidden;
  background:var(--ink);color:var(--paper);
  font-family:"Chakra Petch",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  font-size:17px;line-height:1.78;
}
body::before{
  content:"";position:fixed;inset:-25%;z-index:0;pointer-events:none;
  background:repeating-linear-gradient(135deg,rgba(101,20,255,.20) 0 2px,transparent 2px 20px);
  animation:drift 20s linear infinite;
}
@keyframes drift{to{transform:translate3d(-40px,-40px,0)}}
img{max-width:100%}
a{color:var(--paper)}
:focus-visible{outline:3px solid var(--p2);outline-offset:3px}
body.locked{overflow:hidden}

/* 顶栏：左汉堡 / 中品牌 / 右留白 */
.top{
  position:sticky;top:0;z-index:70;
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:10px;
  padding:10px clamp(12px,3vw,26px);
  background:rgba(28,23,38,.94);
  border-bottom:2px solid var(--ink2);
  backdrop-filter:blur(8px);
}
.burger{
  justify-self:start;appearance:none;cursor:pointer;
  font:inherit;font-size:16px;font-weight:600;letter-spacing:.12em;
  color:var(--paper);background:transparent;
  border:2px solid var(--paper);border-radius:var(--r);
  padding:9px 16px;min-height:44px;
  transition:background .22s,color .22s,border-color .22s;
}
.burger:hover{background:var(--p2);border-color:var(--p2);color:#fff}
.brand{
  justify-self:center;text-decoration:none;color:#fff;font-weight:700;
  font-size:clamp(15px,2.6vw,19px);letter-spacing:.02em;
  padding:9px 18px;background:var(--p1);
  clip-path:polygon(0 0,calc(100% - 12px) 0,100% 12px,100% 100%,12px 100%,0 calc(100% - 12px));
  transition:background .22s;
}
.brand:hover{background:var(--p2)}
.top-r{justify-self:end;width:44px;height:44px}

/* 全屏遮罩菜单 */
.veil{
  position:fixed;inset:0;z-index:60;
  display:flex;align-items:center;justify-content:center;
  padding:84px 0 24px;overflow:auto;
  background:var(--p1);
  transform:translateY(-101%);
  transition:transform .3s ease;
  clip-path:polygon(0 0,100% 0,100% 94%,0 100%);
}
.veil.on{transform:none}
.veil ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:4px;min-width:min(620px,88vw)}
.veil a{
  display:flex;align-items:center;min-height:52px;padding:12px 20px;
  color:#fff;text-decoration:none;font-weight:600;
  font-size:clamp(19px,2.6vw,26px);
  border-bottom:2px solid rgba(255,255,255,.32);
  transition:background .22s,padding-left .22s;
}
.veil a:hover{background:var(--ink);padding-left:34px}

/* 主栅格：左 aside，右 article，hero 通栏 */
main{
  position:relative;z-index:1;
  display:grid;grid-template-columns:minmax(0,250px) minmax(0,1fr);
  gap:48px;align-items:start;
  max-width:1220px;margin:0 auto;
  padding:0 clamp(14px,3vw,30px) 80px;
}

/* Hero */
.hero{
  grid-column:1/-1;position:relative;
  min-height:70vh;display:grid;place-items:center;
  padding:clamp(28px,6vw,72px) 0;overflow:hidden;
  border-bottom:3px solid var(--ink2);
}
.hero::before{
  content:"";position:absolute;left:-12%;right:-12%;bottom:-22%;height:66%;
  background:linear-gradient(120deg,var(--p1),var(--p2));
  clip-path:polygon(0 32%,100% 0,100% 100%,0 100%);opacity:.36;
}
.hero-bg{position:absolute;inset:0;display:grid;place-items:center;overflow:hidden;pointer-events:none}
.hero-bg span{
  font-family:"Russo One",system-ui,sans-serif;
  font-size:clamp(56px,15vw,190px);line-height:.9;letter-spacing:-.02em;
  white-space:nowrap;color:transparent;
  -webkit-text-stroke:2px rgba(191,0,255,.45);
}
.hero-art{position:absolute;inset:0;pointer-events:none}
.art-a,.art-b{
  position:absolute;width:clamp(110px,17vw,210px);aspect-ratio:3/4;
  overflow:hidden;border-radius:var(--r);border:3px solid var(--p2);
  background:linear-gradient(160deg,var(--p1),var(--p2));
  box-shadow:0 18px 40px rgba(0,0,0,.5);
}
.art-a{left:3%;top:11%;transform:rotate(-6deg)}
.art-b{right:3%;bottom:8%;transform:rotate(5deg)}
.art-a img,.art-b img{width:100%;height:100%;object-fit:cover;display:block;border:0}
.hero-in{
  position:relative;z-index:2;text-align:center;
  max-width:min(760px,92%);
  padding:26px clamp(16px,4vw,46px) 30px;
  background:rgba(28,23,38,.74);
  border:3px solid rgba(191,0,255,.6);
  clip-path:polygon(0 20px,20px 0,calc(100% - 20px) 0,100% 20px,100% 100%,0 100%);
  animation:pop .45s ease both;
}
@keyframes pop{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
.kicker{
  margin:0;font-family:"Russo One",system-ui,sans-serif;
  font-size:16px;letter-spacing:.42em;color:var(--p2);
}
.hero h1{
  margin:10px 0 0;color:#fff;
  font-size:clamp(30px,7.2vw,58px);line-height:1.14;letter-spacing:-.01em;
  text-shadow:0 7px 0 rgba(28,23,38,.9);
}

/* 左栏 */
.side{
  position:sticky;top:88px;
  padding:20px 18px;border:2px solid var(--line);
  border-bottom:6px solid var(--p2);border-radius:var(--r);
  background:rgba(101,20,255,.14);
}
.side-h{margin:0 0 8px;font-size:20px;line-height:1.36;letter-spacing:.01em}
.subtitle{margin:0 0 16px;font-size:16px;line-height:1.7;color:rgba(242,237,255,.82)}
.side ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:3px}
.side a{
  display:block;min-height:40px;padding:9px 12px;
  text-decoration:none;font-size:16px;
  border-left:3px solid var(--p1);background:rgba(28,23,38,.5);
  transition:background .2s,border-color .2s,transform .2s,color .2s;
}
.side a:hover{background:var(--p1);border-color:var(--p2);color:#fff;transform:translateX(4px)}

/* 正文 */
.prose{grid-column:2;min-width:0;max-width:76ch}
.prose section{padding:44px 0;border-top:2px solid var(--ink2);scroll-margin-top:96px}
.prose section:first-of-type{border-top:0;padding-top:8px}
.prose h2{
  position:relative;padding-left:16px;margin:0 0 14px;
  font-size:clamp(25px,3.6vw,36px);line-height:1.26;letter-spacing:-.01em;
}
.prose h2::before{
  content:"";position:absolute;left:0;top:.22em;bottom:.22em;width:7px;
  background:linear-gradient(var(--p1),var(--p2));
  clip-path:polygon(0 0,100% 0,100% 100%,0 82%);
}
.prose h2 + .subtitle{margin-top:-6px;margin-bottom:18px}
.prose h3{font-size:21px;line-height:1.4;margin:28px 0 10px;color:#fff}
.prose p{margin:0 0 18px}
.prose a{
  color:#dccbff;text-decoration:underline;text-underline-offset:3px;
  text-decoration-thickness:2px;transition:color .2s,background .2s;
}
.prose a:hover{color:#fff;background:var(--p1)}
.prose ul,.prose ol{margin:0 0 18px;padding-left:1.35em}
.prose li{margin:0 0 8px}
.prose img{height:auto;border-radius:var(--r);border:2px solid var(--ink2)}
.prose blockquote{
  margin:24px 0;padding:14px 20px;
  border-left:6px solid var(--p2);background:rgba(101,20,255,.16);
  border-radius:0 var(--r) var(--r) 0;
}
.prose blockquote p:last-child{margin:0}
.prose strong{color:#fff}
.prose hr{border:0;border-top:2px solid var(--ink2);margin:32px 0}

/* 页脚：四栏网格，仅 p 与 small */
footer{
  position:relative;z-index:1;margin-top:20px;
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;
  padding:clamp(30px,5vw,56px) clamp(16px,3vw,30px) 22px;
  background:var(--p1);color:var(--ink);
  border-top:6px solid var(--p2);
}
footer p{margin:0}
footer .f-brand{
  grid-column:span 2;color:#fff;
  font-family:"Russo One",system-ui,sans-serif;
  font-size:clamp(26px,5.4vw,56px);line-height:1.04;letter-spacing:-.02em;
  text-shadow:0 3px 0 rgba(28,23,38,.35);
}
footer .f-col a{
  display:block;min-height:40px;padding:7px 0;font-size:16px;
  color:var(--ink);text-decoration:none;
  border-bottom:2px solid rgba(28,23,38,.28);
  transition:color .2s,padding-left .2s;
}
footer .f-col a:hover{color:#fff;padding-left:6px}
footer small{
  grid-column:1/-1;font-size:16px;color:var(--ink);
  border-top:2px solid rgba(28,23,38,.38);padding-top:14px;
}

/* 回到顶部 */
.totop{
  position:fixed;right:16px;bottom:16px;z-index:50;
  min-height:44px;padding:10px 16px;cursor:pointer;
  font:inherit;font-size:16px;font-weight:600;color:#fff;
  background:var(--p2);border:0;border-radius:var(--r);
  opacity:0;pointer-events:none;
  transition:opacity .25s,background .2s;
}
.totop.show{opacity:1;pointer-events:auto}
.totop:hover{background:var(--p1)}

/* 滚动揭示 */
.js .rv{opacity:0;transform:translateY(18px);transition:opacity .3s ease,transform .3s ease}
.js .rv.in{opacity:1;transform:none}

@media (max-width:900px){
  main{grid-template-columns:minmax(0,1fr);gap:26px;padding-bottom:56px}
  .hero{grid-column:1;min-height:auto;padding:34px 0 40px}
  .hero-bg span{opacity:.55}
  .art-a,.art-b{width:86px;aspect-ratio:1/1;opacity:.9}
  .art-a{left:-10px;top:6%}
  .art-b{right:-10px;bottom:4%}
  .hero-in{max-width:94%;padding:22px 18px 26px}
  .side{position:static;grid-column:1}
  .side ul{flex-direction:row;gap:8px;overflow-x:auto;padding-bottom:6px}
  .side a{
    border-left:0;border-bottom:3px solid var(--p1);
    border-radius:6px;white-space:nowrap;
  }
  .side a:hover{transform:none}
  .prose{grid-column:1}
  footer{grid-template-columns:repeat(2,minmax(0,1fr))}
  footer .f-brand{grid-column:span 2}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  body::before,.hero-in{animation:none}
  .veil{transition:none}
  .js .rv{opacity:1;transform:none;transition:none}
  .totop{transition:none}
}

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