@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

:root{
  --pink:#ff0080;
  --mag:#ff00ff;
  --ink:#26171f;
  --paper:#f8eff4;
  --dim:#cdb6c3;
  --line:rgba(255,0,128,.30);
  --mono:'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans:'IBM Plex Sans', "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
}

*,*::before,*::after{box-sizing:border-box}

html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  background:var(--ink);
  color:var(--paper);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.8;
  overflow-x:hidden;
}

body::before{
  content:"";
  position:fixed;
  inset:-25%;
  z-index:-2;
  pointer-events:none;
  background:
    radial-gradient(40% 42% at 18% 22%, rgba(255,0,128,.58), transparent 62%),
    radial-gradient(46% 40% at 80% 12%, rgba(255,0,255,.44), transparent 64%),
    radial-gradient(52% 50% at 62% 88%, rgba(255,0,128,.40), transparent 66%),
    conic-gradient(from 200deg at 40% 60%, rgba(255,0,255,.26), rgba(255,0,128,.30), rgba(255,0,255,.26));
  filter:blur(50px) saturate(135%);
  opacity:.92;
  animation:drift 26s ease-in-out infinite alternate, shimmer 24s linear infinite;
}

@keyframes drift{
  0%{transform:translate3d(-2%,-1%,0) scale(1)}
  100%{transform:translate3d(3%,2%,0) scale(1.14)}
}

@keyframes shimmer{
  to{filter:blur(50px) saturate(135%) hue-rotate(36deg)}
}

body::after{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background-image:radial-gradient(rgba(255,255,255,.18) 1px, transparent 1px);
  background-size:26px 26px;
  opacity:.30;
  -webkit-mask-image:linear-gradient(#000, rgba(0,0,0,.35));
  mask-image:linear-gradient(#000, rgba(0,0,0,.35));
}

img{max-width:100%}

a{color:var(--pink)}

a:focus-visible,button:focus-visible{
  outline:2px solid var(--mag);
  outline-offset:3px;
}

/* ---------- 左侧竖排导航 ---------- */
.rail{
  position:fixed;
  left:0;
  top:0;
  bottom:0;
  width:186px;
  z-index:20;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:16px;
  padding:18px 12px 20px;
  background:rgba(38,23,31,.66);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  border-right:1px solid var(--line);
}

.mark{
  display:grid;
  place-items:center;
  width:46px;
  height:46px;
  border:1px solid var(--pink);
  border-radius:999px;
  color:#fff;
  text-decoration:none;
  font-family:var(--mono);
  font-weight:700;
  background:rgba(255,0,128,.10);
  flex:0 0 auto;
}

.mark-char{font-size:18px;line-height:1}
.mark img{width:24px;height:24px;object-fit:contain;display:block}
.mark:hover{border-color:var(--mag);background:rgba(255,0,255,.16)}

.rail-nav{width:100%}
.rail-nav ul{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-direction:column;
  gap:8px;
}

.rail-nav a{
  display:block;
  padding:10px 12px;
  min-height:44px;
  border:1px solid var(--line);
  border-radius:999px;
  color:var(--paper);
  text-decoration:none;
  font-family:var(--mono);
  font-size:16px;
  line-height:1.5;
  text-align:center;
  white-space:nowrap;
  background:rgba(255,255,255,.03);
  transition:background .25s, color .25s, border-color .25s;
}

.rail-nav a:hover,
.rail-nav a:focus-visible{
  background:linear-gradient(100deg,var(--pink),var(--mag));
  border-color:transparent;
  color:#1a0d14;
}

.cta{
  position:fixed;
  right:22px;
  bottom:22px;
  z-index:30;
  display:inline-flex;
  align-items:center;
  min-height:46px;
  padding:10px 24px;
  border:1px solid rgba(255,255,255,.42);
  border-radius:999px;
  background:linear-gradient(100deg,var(--pink),var(--mag));
  color:#1a0d14;
  font-family:var(--mono);
  font-size:16px;
  font-weight:700;
  text-decoration:none;
  box-shadow:0 0 0 6px rgba(255,0,128,.12);
}

.cta:hover{filter:hue-rotate(-18deg)}

/* ---------- 主体 ---------- */
main{margin-left:186px;display:block}

.wrap{
  max-width:1120px;
  margin:0 auto;
  padding:0 clamp(18px,4vw,46px) 76px;
}

.hero{
  min-height:100vh;
  display:flex;
  flex-direction:column;
  justify-content:center;
  align-items:center;
  text-align:center;
  gap:20px;
  padding:70px 0 46px;
}

.hero h1{
  margin:0;
  font-family:var(--mono);
  font-weight:700;
  font-size:clamp(31px,5vw,58px);
  line-height:1.14;
  letter-spacing:-.015em;
  background:linear-gradient(104deg,#ffffff 8%, var(--pink) 52%, var(--mag) 88%);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}

.hero-sub{
  margin:0;
  max-width:56ch;
  color:var(--dim);
  font-size:17px;
  line-height:1.85;
}

.hero-media{
  margin:24px 0 0;
  width:100%;
  max-width:720px;
  border:1px solid var(--line);
  border-radius:0;
  overflow:hidden;
  background:rgba(255,255,255,.04);
  will-change:transform;
}

.hero-media img{display:block;width:100%;height:auto}

/* ---------- 正文舞台 ---------- */
.stage{
  display:grid;
  grid-template-columns:minmax(0,1fr) 250px;
  gap:clamp(22px,3.4vw,48px);
  align-items:start;
  border-top:1px solid var(--line);
  padding-top:40px;
}

.prose{min-width:0}

.prose section{
  scroll-margin-top:96px;
  padding:8px 0 38px;
  border-top:1px dashed rgba(255,0,255,.24);
  margin-top:30px;
}

.prose section:first-child{margin-top:0;padding-top:0;border-top:0}

.prose h2{
  font-family:var(--mono);
  font-weight:700;
  font-size:clamp(22px,3.1vw,31px);
  line-height:1.32;
  color:#fff;
  margin:0 0 .7em;
  letter-spacing:-.01em;
}

.prose h2 small,
.prose h3 small{
  display:block;
  font-family:var(--mono);
  font-size:14px;
  font-weight:500;
  letter-spacing:.22em;
  color:var(--mag);
  margin-bottom:.55em;
  text-transform:uppercase;
}

.prose h3{
  font-family:var(--mono);
  font-size:20px;
  line-height:1.45;
  color:#ffd8ec;
  margin:1.5em 0 .6em;
}

.prose p,
.prose li{
  color:#eadde5;
  font-size:17px;
  line-height:1.9;
}

.prose p{margin:0 0 1.05em}

.prose ul,
.prose ol{padding-left:1.35em;margin:0 0 1.1em}
.prose li{margin:.35em 0}

.prose a{
  color:var(--pink);
  text-decoration:underline;
  text-underline-offset:3px;
  text-decoration-thickness:1px;
}

.prose a:hover{color:var(--mag)}

.prose blockquote{
  margin:1.2em 0;
  padding:.2em 0 .2em 18px;
  border-left:2px solid var(--pink);
  color:var(--dim);
  font-style:normal;
}

.prose strong{color:#fff}

.prose code{
  font-family:var(--mono);
  font-size:.92em;
  padding:.12em .4em;
  border:1px solid var(--line);
  background:rgba(255,255,255,.06);
  color:#ffd8ec;
}

.prose pre{
  font-family:var(--mono);
  font-size:15px;
  line-height:1.7;
  padding:16px;
  overflow-x:auto;
  border:1px solid var(--line);
  background:rgba(20,10,16,.7);
}

.prose pre code{border:0;background:none;padding:0}

.prose figure{margin:1.2em 0}
.prose figcaption{font-size:15px;color:var(--dim);margin-top:.5em}

/* ---------- 右侧目录 ---------- */
.side{
  position:sticky;
  top:24px;
  padding:18px 16px 14px;
  border:1px solid var(--line);
  border-radius:0;
  background:rgba(38,23,31,.62);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
}

.side small{
  display:block;
  font-family:var(--mono);
  font-size:14px;
  letter-spacing:.24em;
  color:var(--mag);
}

.side h2{
  font-family:var(--mono);
  font-size:18px;
  line-height:1.4;
  color:#fff;
  margin:.4em 0 .75em;
}

.side-list{
  list-style:none;
  margin:0;
  padding:0;
  counter-reset:s;
}

.side-list li{counter-increment:s}

.side-list a{
  display:block;
  padding:9px 4px;
  min-height:40px;
  color:var(--dim);
  text-decoration:none;
  font-size:15px;
  line-height:1.6;
  border-bottom:1px solid rgba(255,255,255,.09);
}

.side-list a::before{
  content:"0" counter(s) "  ";
  font-family:var(--mono);
  font-size:13px;
  color:var(--pink);
}

.side-list a:hover{color:#fff;background:rgba(255,0,128,.10)}

/* ---------- 页脚 ---------- */
.foot{
  margin-left:186px;
  border-top:1px solid var(--line);
  background:rgba(18,10,14,.74);
  padding:clamp(32px,5vw,66px) clamp(18px,4vw,46px) 26px;
  display:grid;
  grid-template-columns:minmax(0,1fr) 250px;
  gap:clamp(26px,4vw,56px);
}

.giant{
  margin:0 0 16px;
  font-family:var(--mono);
  font-weight:700;
  font-size:clamp(38px,8.6vw,96px);
  line-height:.96;
  letter-spacing:-.02em;
  word-break:break-all;
  background:linear-gradient(118deg,#ffffff, var(--pink) 46%, var(--mag) 92%);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}

.foot-desc{
  margin:0;
  max-width:46ch;
  color:var(--dim);
  font-size:16px;
  line-height:1.85;
}

.foot-links nav dl{
  margin:0;
  padding:0;
  counter-reset:fn;
}

.foot-links dt{counter-increment:fn}

.foot-links dt a{
  display:block;
  padding:9px 0;
  min-height:40px;
  color:var(--paper);
  text-decoration:none;
  font-family:var(--mono);
  font-size:15px;
  line-height:1.6;
  border-bottom:1px solid rgba(255,255,255,.10);
}

.foot-links dt a::before{
  content:"0" counter(fn) "  ";
  color:var(--pink);
  font-size:13px;
}

.foot-links dt a:hover{color:var(--mag);padding-left:4px}

.foot-links dd{margin:0;height:0}

.foot-base{
  grid-column:1 / -1;
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  justify-content:space-between;
  align-items:center;
  border-top:1px solid rgba(255,255,255,.14);
  padding-top:16px;
  font-family:var(--mono);
  font-size:14px;
  color:var(--dim);
}

.copy{margin:0}

.base-links{
  margin:0;
  display:flex;
  gap:8px;
}

.base-links a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:8px 14px;
  border:1px solid var(--line);
  border-radius:999px;
  color:var(--dim);
  text-decoration:none;
}

.base-links a:hover{color:#fff;border-color:var(--mag)}

/* ---------- 动效 ---------- */
.rv{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .7s ease, transform .7s ease;
}

.rv.on{opacity:1;transform:none}

/* ---------- 移动端 ---------- */
@media (max-width:899px){
  .rail{
    position:static;
    width:auto;
    flex-direction:row;
    flex-wrap:wrap;
    align-items:center;
    gap:10px;
    padding:12px 14px;
    border-right:0;
    border-bottom:1px solid var(--line);
  }

  .rail-nav{flex:1 1 auto;min-width:0;width:auto}

  .rail-nav ul{
    flex-direction:row;
    flex-wrap:wrap;
    gap:8px;
  }

  .rail-nav a{
    padding:9px 13px;
    min-height:40px;
    font-size:16px;
  }

  .cta{
    position:static;
    display:inline-block;
    margin:12px 14px 0;
    box-shadow:none;
  }

  main,.foot{margin-left:0}

  .hero{min-height:auto;padding:44px 0 32px}

  .stage{
    grid-template-columns:1fr;
    gap:26px;
    padding-top:28px;
  }

  .side{position:static}

  .prose section{scroll-margin-top:20px}

  .foot{grid-template-columns:1fr}

  .giant{font-size:clamp(34px,11vw,60px)}
}

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

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