:root{
  --pink:#ff0080;
  --mag:#ff00ff;
  --ink:#26171f;
  --bg:#0b050a;
  --paper:#f9eef5;
  --glass:rgba(255,255,255,.05);
  --line:rgba(255,255,255,.12);
  --r:10px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--bg);-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--paper);
  font-family:"Be Vietnam Pro","Noto Sans",system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{color:inherit}
a:focus-visible,button:focus-visible{outline:2px solid var(--mag);outline-offset:3px;border-radius:6px}
img{max-width:100%}

/* ---------- aurora bed ---------- */
.aurora{
  position:fixed;
  inset:-25% -20%;
  z-index:-1;
  pointer-events:none;
  background:
    radial-gradient(38% 42% at 18% 22%,rgba(255,0,128,.55),transparent 68%),
    radial-gradient(34% 40% at 82% 12%,rgba(255,0,255,.42),transparent 70%),
    radial-gradient(46% 44% at 74% 78%,rgba(255,0,128,.40),transparent 72%),
    radial-gradient(52% 52% at 22% 84%,rgba(96,0,168,.55),transparent 70%),
    linear-gradient(160deg,#1a0813,#090309 58%,#1c0616);
  filter:blur(56px) saturate(140%);
  animation:auroraFlow 26s ease-in-out infinite alternate;
}
.aurora::after{
  content:"";
  position:absolute;
  inset:0;
  background:conic-gradient(from 120deg at 60% 38%,rgba(255,0,255,.34),transparent 38%,rgba(255,0,128,.30) 72%,transparent);
  mix-blend-mode:screen;
  opacity:.65;
  animation:shimmer 18s linear infinite;
}
@keyframes auroraFlow{
  from{transform:translate3d(0,0,0) rotate(0deg)}
  to{transform:translate3d(-3%,2%,0) rotate(7deg)}
}
@keyframes shimmer{
  from{filter:hue-rotate(0deg)}
  to{filter:hue-rotate(90deg)}
}

/* ---------- left rail ---------- */
.rail{
  position:fixed;
  left:0;
  top:0;
  bottom:0;
  width:264px;
  z-index:30;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:34px;
  padding:38px 18px;
  border-right:1px solid var(--line);
  background:linear-gradient(180deg,rgba(38,23,31,.72),rgba(11,5,10,.86));
  backdrop-filter:blur(18px);
}
.brand{
  margin:0;
  text-align:center;
  font-size:19px;
  font-weight:600;
  letter-spacing:.16em;
  line-height:1.5;
}
.brand a{
  color:#fff;
  text-decoration:none;
  background:linear-gradient(96deg,#fff,#ffbfe0 60%,#ff6fb8);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.rail nav{width:100%}
.rail nav p{
  margin:0;
  columns:2;
  column-gap:10px;
  text-align:center;
}
.rail nav a{
  display:flex;
  align-items:center;
  justify-content:center;
  min-height:40px;
  padding:8px 6px;
  font-size:16px;
  line-height:1.4;
  color:rgba(255,255,255,.76);
  text-decoration:none;
  border-radius:var(--r);
  break-inside:avoid;
  transition:color .25s,background .25s,transform .25s;
}
.rail nav a:hover{color:#fff;background:rgba(255,0,128,.22);transform:translateY(-1px)}
.rail nav a.on{color:#fff;background:linear-gradient(100deg,rgba(255,0,128,.42),rgba(255,0,255,.22))}

/* ---------- shell ---------- */
main{
  margin-left:264px;
  padding:0 clamp(20px,4vw,60px);
}
.wrap{max-width:1080px;margin:0 auto}

/* ---------- hero ---------- */
.hero{
  position:relative;
  min-height:100vh;
  min-height:100svh;
  display:grid;
  grid-template-rows:auto minmax(0,1fr);
  align-content:center;
  align-items:center;
  justify-items:center;
  gap:30px;
  padding:70px 0 56px;
  text-align:center;
  overflow:hidden;
}
.hero-ghost{
  position:absolute;
  inset:0;
  display:grid;
  place-items:center;
  padding:0 6px;
  font-size:clamp(52px,11vw,168px);
  font-weight:700;
  line-height:1.02;
  letter-spacing:-.03em;
  color:rgba(255,255,255,.085);
  mix-blend-mode:screen;
  overflow-wrap:anywhere;
  pointer-events:none;
  animation:ghostDrift 20s ease-in-out infinite alternate;
}
@keyframes ghostDrift{
  from{transform:translate3d(-1.5%,0,0) scale(1)}
  to{transform:translate3d(1.5%,-1%,0) scale(1.04)}
}
.hero-copy{position:relative;z-index:1;max-width:20ch}
h1{
  margin:0;
  font-size:clamp(27px,5.2vw,50px);
  line-height:1.22;
  font-weight:700;
  letter-spacing:-.01em;
  background:linear-gradient(100deg,#fff 8%,#ffc9e4 42%,#ff74bd 68%,#fff);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  text-shadow:0 0 46px rgba(255,0,128,.35);
}
.hero-desc{
  margin:16px auto 0;
  max-width:42ch;
  font-size:16px;
  line-height:1.7;
  color:rgba(255,255,255,.72);
}
.hero-media{
  position:relative;
  width:min(880px,100%);
  max-height:52vh;
  border-radius:var(--r);
  overflow:hidden;
  border:1px solid rgba(255,255,255,.18);
  background:var(--glass);
  box-shadow:0 26px 74px rgba(255,0,128,.22);
  backdrop-filter:blur(12px);
}
.hero-media img{display:block;width:100%;height:100%;max-height:52vh;object-fit:cover}

/* ---------- frame: aside + section ---------- */
.frame{
  display:grid;
  grid-template-columns:204px minmax(0,1fr);
  gap:clamp(20px,3vw,44px);
  align-items:start;
  padding:58px 0 84px;
  border-top:1px solid var(--line);
}
.side{
  position:sticky;
  top:34px;
  padding:16px 12px;
  border:1px solid var(--line);
  border-radius:var(--r);
  background:var(--glass);
  backdrop-filter:blur(14px);
}
.side-head{
  margin:0 0 10px;
  font-size:16px;
  letter-spacing:.26em;
  color:rgba(255,255,255,.58);
}
.side-list{
  margin:0;
  display:flex;
  flex-direction:column;
  gap:2px;
}
.side-list a{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:8px 8px;
  font-size:16px;
  line-height:1.45;
  color:rgba(255,255,255,.8);
  text-decoration:none;
  border-radius:8px;
  transition:background .25s,color .25s;
}
.side-list a:hover{background:rgba(255,0,128,.2);color:#fff}
.side-list a.on{background:linear-gradient(100deg,rgba(255,0,128,.38),rgba(255,0,255,.2));color:#fff}

/* ---------- section ---------- */
section{min-width:0}
section > h2{
  margin:0 0 14px;
  font-size:clamp(20px,2.4vw,26px);
  line-height:1.4;
  letter-spacing:.02em;
}
section hr{
  border:0;
  height:1px;
  background:linear-gradient(90deg,var(--pink),var(--mag),transparent);
  margin:12px 0 20px;
}
section > hr{margin:0 0 32px}
section > article{
  margin:0 0 20px;
  padding:clamp(20px,3vw,34px);
  border:1px solid rgba(255,255,255,.11);
  border-radius:var(--r);
  background:rgba(255,255,255,.045);
  backdrop-filter:blur(14px);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.07);
  scroll-margin-top:32px;
  transition:border-color .3s,box-shadow .3s,transform .3s,background .3s;
  animation:rise .5s ease-out both;
}
section > article:hover{
  border-color:rgba(255,0,128,.48);
  background:rgba(255,255,255,.07);
  box-shadow:0 18px 52px rgba(255,0,128,.16);
  transform:translateY(-2px);
}
@keyframes rise{from{opacity:0}to{opacity:1}}
section h2,
section > article h2{
  margin:0 0 12px;
  font-size:clamp(19px,2.2vw,23px);
  line-height:1.45;
  letter-spacing:.01em;
  color:#fff;
}
section h3{
  margin:24px 0 10px;
  font-size:18px;
  line-height:1.5;
  color:#ffd2e7;
}
section p{margin:0 0 14px}
section p:last-child{margin-bottom:0}
section ul,section ol{margin:0 0 16px;padding-left:1.25em}
section li{margin:0 0 8px}
section strong{color:#fff}
section a{color:#ff92c9;text-decoration:underline;text-underline-offset:3px}
section a:hover{color:#fff}
section img{border-radius:var(--r);display:block;height:auto;margin:16px 0}
section blockquote{
  margin:0 0 16px;
  padding:12px 18px;
  border-left:2px solid var(--pink);
  background:rgba(255,0,128,.09);
  border-radius:0 var(--r) var(--r) 0;
}
section table{width:100%;border-collapse:collapse;font-size:16px}
section th,section td{border-bottom:1px solid var(--line);padding:10px 8px;text-align:left}

/* ---------- footer ---------- */
.foot{
  margin-left:264px;
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  align-items:center;
  gap:12px 20px;
  padding:26px clamp(20px,4vw,60px);
  border-top:1px solid var(--line);
  background:rgba(9,3,9,.55);
  font-size:16px;
  color:rgba(255,255,255,.62);
}
.foot p{margin:0}
.foot small{font-size:16px;color:rgba(255,255,255,.5)}
.foot p:first-child{color:#ffb3d8;letter-spacing:.08em}

/* ---------- narrow ---------- */
@media (max-width:899px){
  .rail{
    position:sticky;
    top:0;
    left:auto;
    right:auto;
    bottom:auto;
    width:auto;
    align-items:stretch;
    justify-content:flex-start;
    gap:6px;
    padding:8px 12px 10px;
    border-right:0;
    border-bottom:1px solid var(--line);
    backdrop-filter:blur(16px);
  }
  .brand{font-size:16px;letter-spacing:.1em}
  .rail nav{width:100%;overflow-x:auto;scrollbar-width:none}
  .rail nav::-webkit-scrollbar{display:none}
  .rail nav p{columns:auto;display:flex;gap:6px;text-align:left}
  .rail nav a{flex:0 0 auto;white-space:nowrap;padding:9px 12px}
  main{margin-left:0;padding:0 14px}
  .hero{min-height:0;padding:26px 0 32px;gap:18px}
  .hero-ghost{font-size:clamp(36px,12.5vw,84px)}
  .hero-copy{max-width:100%}
  .hero-media,.hero-media img{max-height:none}
  .frame{grid-template-columns:1fr;gap:22px;padding:28px 0 46px}
  section{order:1}
  aside{order:2;position:static}
  .side-list{flex-direction:row;flex-wrap:wrap;gap:6px}
  .side-list a{padding:8px 10px}
  section > article{scroll-margin-top:120px}
  .foot{margin-left:0;flex-direction:column;align-items:flex-start;gap:6px;padding:20px 14px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  section > article:hover{transform:none}
}

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