:root{
  --red:#ff0000;
  --pink:#ff006e;
  --ink:#1a1a2e;
  --cyan:#2ae4ff;
  --bg:#08080f;
  --panel:#101022;
  --fg:#ecebf6;
  --dim:#a7a3c2;
  --rail:252px;
  --edge:rgba(255,0,110,.34);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--fg);
  font-family:"Barlow","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  font-size:17px;
  line-height:1.7;
  letter-spacing:.01em;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:80;
  pointer-events:none;
  background:repeating-linear-gradient(180deg,rgba(255,255,255,.05) 0 1px,transparent 1px 3px);
  opacity:.45;
}
img{max-width:100%;height:auto}
h1,h2,h3,.brand,.cta,.side h2{
  font-family:"Barlow Condensed","Barlow","PingFang SC",system-ui,sans-serif;
}
p{margin:0}
a{color:inherit}
::selection{background:var(--pink);color:#0a0010}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}

/* ---------- 左侧固定竖栏 ---------- */
.rail{
  position:fixed;
  inset:0 auto 0 0;
  width:var(--rail);
  z-index:20;
  display:flex;
  flex-direction:column;
  gap:22px;
  padding:22px 18px 26px;
  background:linear-gradient(180deg,#120f22 0%,#08080f 78%);
  border-right:1px solid var(--edge);
  box-shadow:inset -1px 0 0 rgba(255,0,0,.12),6px 0 40px rgba(0,0,0,.65);
}
.brandrow{display:flex;align-items:center}
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:46px;
  text-decoration:none;
  color:#fff;
  font-weight:700;
  font-size:26px;
  line-height:1.1;
  letter-spacing:.04em;
  text-shadow:0 0 10px rgba(255,0,110,.85),0 0 26px rgba(255,0,0,.5);
}
.brand img{display:block;width:36px;height:36px;border-radius:4px}
nav{margin:0}
.navline{
  display:flex;
  flex-direction:column;
  gap:8px;
  margin:0;
  padding:0;
}
.navline a{
  display:block;
  min-height:44px;
  padding:11px 15px;
  border:1px solid rgba(255,0,110,.38);
  border-radius:999px;
  background:rgba(255,0,110,.05);
  color:#d2cee6;
  font-size:16px;
  line-height:1.3;
  text-decoration:none;
  transition:transform .22s ease,box-shadow .22s ease,background .22s ease,color .22s ease,border-color .22s ease;
}
.navline a:hover,.navline a:focus-visible{
  color:#fff;
  border-color:var(--red);
  background:rgba(255,0,0,.18);
  transform:translateX(3px);
  box-shadow:0 0 18px rgba(255,0,110,.45),inset 0 0 12px rgba(255,0,110,.18);
}
.cta{
  margin-top:auto;
  display:block;
  padding:13px 12px;
  border-radius:999px;
  text-align:center;
  text-decoration:none;
  font-weight:700;
  font-size:18px;
  letter-spacing:.16em;
  color:#10000a;
  background:linear-gradient(100deg,var(--red),var(--pink));
  box-shadow:0 0 22px rgba(255,0,110,.5);
  transition:filter .2s ease,box-shadow .2s ease,transform .2s ease;
}
.cta:hover,.cta:focus-visible{filter:brightness(1.12);transform:translateY(-2px);box-shadow:0 0 30px rgba(255,0,110,.7)}

/* ---------- 主区 ---------- */
main{
  margin-left:var(--rail);
  padding:0 clamp(18px,3.6vw,52px);
  max-width:1280px;
}

/* hero */
.hero{
  position:relative;
  display:grid;
  grid-template-columns:minmax(0,1.08fr) minmax(0,.82fr);
  gap:clamp(22px,3.6vw,54px);
  align-items:center;
  min-height:70vh;
  padding:clamp(42px,8vh,96px) 0 clamp(30px,5vh,60px);
  border-bottom:1px solid var(--edge);
}
.hero::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(255,0,110,.14) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,0,110,.14) 1px,transparent 1px);
  background-size:46px 46px;
  -webkit-mask-image:radial-gradient(ellipse at 34% 38%,#000 12%,transparent 76%);
  mask-image:radial-gradient(ellipse at 34% 38%,#000 12%,transparent 76%);
}
.hero-copy{position:relative;z-index:1;min-width:0}
.badge{
  display:inline-block;
  margin:0 0 16px;
  padding:7px 16px;
  border:1px solid var(--pink);
  border-radius:999px;
  font-size:16px;
  letter-spacing:.2em;
  color:#ffd9e6;
  background:rgba(255,0,110,.1);
  box-shadow:0 0 16px rgba(255,0,110,.35);
}
h1{
  position:relative;
  display:inline-block;
  margin:0 0 20px;
  font-size:clamp(38px,5.6vw,74px);
  line-height:1.06;
  font-weight:700;
  letter-spacing:.01em;
  color:#fff;
  text-shadow:0 0 10px rgba(255,0,110,.9),0 0 34px rgba(255,0,0,.55);
}
h1.glitch::before,
h1.glitch::after{
  content:attr(data-text);
  position:absolute;
  left:0;
  top:0;
  width:100%;
  pointer-events:none;
  opacity:.72;
}
h1.glitch::before{color:var(--cyan);clip-path:inset(0 0 56% 0);animation:gl-a 5.5s infinite steps(2)}
h1.glitch::after{color:var(--pink);clip-path:inset(56% 0 0 0);animation:gl-b 7s infinite steps(2)}
@keyframes gl-a{
  0%,90%,100%{transform:translate(-2px,-2px)}
  93%{transform:translate(-6px,-1px) skewX(-7deg)}
  96%{transform:translate(3px,1px) skewX(5deg)}
}
@keyframes gl-b{
  0%,88%,100%{transform:translate(2px,2px)}
  92%{transform:translate(6px,1px) skewX(6deg)}
  95%{transform:translate(-4px,-1px) skewX(-4deg)}
}
.lead{
  max-width:54ch;
  font-size:17px;
  line-height:1.75;
  color:var(--dim);
}
.hero-art{
  position:relative;
  z-index:1;
  margin:0;
  aspect-ratio:4/5;
  overflow:hidden;
  border:4px solid var(--pink);
  border-radius:4px;
  background:
    radial-gradient(circle at 22% 18%,rgba(255,0,110,.42),transparent 58%),
    linear-gradient(150deg,rgba(255,0,0,.28),rgba(26,26,46,.94) 62%),
    var(--ink);
  box-shadow:0 0 0 1px rgba(255,255,255,.07),0 0 38px rgba(255,0,110,.35);
}
.hero-art::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    repeating-linear-gradient(90deg,rgba(255,255,255,.08) 0 1px,transparent 1px 22px),
    repeating-linear-gradient(0deg,rgba(255,255,255,.08) 0 1px,transparent 1px 22px);
  pointer-events:none;
}
.hero-art::after{
  content:"";
  position:absolute;
  inset:10px;
  border:1px dashed rgba(255,255,255,.3);
  border-radius:2px;
  pointer-events:none;
}
.hero-art img{position:relative;z-index:2;display:block;width:100%;height:100%;object-fit:cover}

/* stage */
.stage{
  display:grid;
  grid-template-columns:220px minmax(0,1fr);
  gap:clamp(20px,3vw,46px);
  padding:clamp(30px,5vh,58px) 0 clamp(34px,6vh,66px);
}
.side{
  position:sticky;
  top:24px;
  align-self:start;
  padding:16px 14px 18px;
  border:1px solid rgba(255,0,110,.45);
  border-radius:4px;
  background:rgba(255,0,110,.05);
  box-shadow:inset 0 0 24px rgba(255,0,110,.07);
}
.side h2{
  margin:0 0 8px;
  font-size:22px;
  font-weight:700;
  letter-spacing:.24em;
  color:#fff;
  text-shadow:0 0 10px rgba(255,0,110,.85);
}
.side .subtitle{
  height:2px;
  margin:0 0 14px;
  background:linear-gradient(90deg,var(--red),rgba(255,0,110,.15));
}
.side-list{
  margin:0;
  padding:0;
  list-style:none;
  counter-reset:sd;
  font-size:16px;
}
.side-list li{counter-increment:sd}
.side-list a{
  position:relative;
  display:block;
  min-height:40px;
  padding:9px 0 9px 28px;
  border-bottom:1px dashed rgba(255,0,110,.2);
  color:#c9c5de;
  text-decoration:none;
  line-height:1.35;
  transition:color .2s ease,text-shadow .2s ease;
}
.side-list li:last-child a{border-bottom:0}
.side-list a::before{
  content:counter(sd,decimal-leading-zero);
  position:absolute;
  left:0;
  top:10px;
  font-size:13px;
  letter-spacing:.1em;
  color:var(--pink);
}
.side-list a:hover,.side-list a:focus-visible{color:#fff;text-shadow:0 0 10px rgba(255,0,110,.9)}

/* 正文 */
.content{min-width:0}
.content section{
  scroll-margin-top:34px;
  padding:clamp(26px,4vh,46px) 0;
  border-top:1px solid rgba(255,0,110,.22);
}
.content section:first-child{border-top:0;padding-top:0}
.content h2{
  margin:0 0 14px;
  font-size:clamp(26px,3.2vw,38px);
  font-weight:700;
  line-height:1.16;
  color:#fff;
  letter-spacing:.02em;
  text-shadow:0 0 10px rgba(255,0,110,.55);
}
.content h3{
  margin:26px 0 10px;
  font-size:21px;
  line-height:1.3;
  color:#ffd5e3;
}
.content p{margin:0 0 16px;color:#d8d4ea}
.content a{color:#ff8ab4;text-decoration:underline;text-underline-offset:3px}
.content ul,.content ol{margin:0 0 16px;padding-left:1.25em}
.content li{margin:0 0 8px}
.content figure{margin:22px 0}
.content img{border:1px solid rgba(255,0,110,.4);border-radius:4px}
.content blockquote{
  margin:22px 0;
  padding:14px 18px;
  border-left:4px solid var(--pink);
  border-radius:0 4px 4px 0;
  background:rgba(255,0,110,.07);
  color:#e4e0f2;
}
.content table{width:100%;border-collapse:collapse;margin:0 0 18px;font-size:16px}
.content th,.content td{border:1px solid rgba(255,0,110,.3);padding:9px 12px;text-align:left}
.content th{background:rgba(255,0,110,.12);color:#fff}

/* ---------- 页脚 ---------- */
footer{
  margin-left:var(--rail);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:center;
  gap:2px clamp(16px,3vw,32px);
  padding:22px clamp(18px,3.6vw,52px) 30px;
  border-top:1px solid var(--edge);
  color:var(--dim);
  font-size:16px;
}
footer section{flex:0 0 auto;margin:0}
footer p{margin:0;display:flex;flex-wrap:wrap;justify-content:center;gap:2px 16px}
footer a{
  display:inline-block;
  min-height:44px;
  padding:10px 2px;
  line-height:24px;
  color:#cfcbe4;
  text-decoration:none;
  transition:color .2s ease,text-shadow .2s ease;
}
footer a:hover,footer a:focus-visible{color:#fff;text-shadow:0 0 10px rgba(255,0,110,.9)}
.f-copy p{letter-spacing:.06em}

/* ---------- 滚动显现 ---------- */
.reveal{transition:opacity .58s ease,transform .58s cubic-bezier(.2,.75,.3,1)}
html.js .reveal:not(.in){opacity:0;transform:translateY(20px)}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{animation-duration:.001s!important;animation-iteration-count:1!important;transition-duration:.001s!important}
  html.js .reveal:not(.in){opacity:1;transform:none}
}

/* ---------- 平板 / 手机 ---------- */
@media (max-width:980px){
  .hero{grid-template-columns:minmax(0,1fr);min-height:0}
  .hero-art{order:2;aspect-ratio:16/10}
  .stage{grid-template-columns:minmax(0,1fr)}
  .side{position:static}
}

@media (max-width:860px){
  .rail{
    position:sticky;
    top:0;
    inset:0 0 auto;
    width:auto;
    gap:10px;
    padding:10px 14px 12px;
    border-right:0;
    border-bottom:1px solid var(--edge);
    background:rgba(8,8,15,.96);
    box-shadow:0 8px 26px rgba(0,0,0,.7);
  }
  .brandrow{justify-content:space-between;gap:12px}
  .brand{font-size:22px}
  .navline{
    flex-direction:row;
    gap:8px;
    overflow-x:auto;
    padding-bottom:4px;
    scrollbar-width:thin;
  }
  .navline a{flex:0 0 auto;white-space:nowrap;min-height:42px;padding:10px 15px}
  .navline a:hover,.navline a:focus-visible{transform:none}
  .cta{margin-top:0;align-self:flex-start;padding:10px 20px;font-size:16px}
  main{margin-left:0;padding:0 16px}
  .stage{padding-top:22px}
  .content section{scroll-margin-top:128px}
  footer{margin-left:0;flex-direction:column;gap:6px;text-align:center}
  footer p{justify-content:center}
}

@media (max-width:420px){
  .badge{letter-spacing:.14em}
  .side{padding:14px 12px}
}

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