:root{
  --red:#ff0000;
  --pink:#ff1493;
  --ink:#261717;
  --text:#f9efef;
  --dim:#ccb7b7;
  --line:rgba(255,255,255,.13);
  --line-hot:rgba(255,20,147,.38);
  --glass:rgba(255,255,255,.055);
  --sans:Rubik,"Helvetica Neue",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  --head:Outfit,var(--sans);
}

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

html{
  background:var(--ink);
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  position:relative;
  overflow-x:hidden;
  font-family:var(--sans);
  font-size:17px;
  line-height:1.7;
  color:var(--text);
  padding-bottom:96px;
}

body::before{
  content:"";
  position:fixed;
  inset:-25% -12%;
  z-index:-2;
  pointer-events:none;
  background:
    radial-gradient(46% 56% at 16% 10%,rgba(255,0,0,.62),transparent 62%),
    radial-gradient(52% 62% at 84% 20%,rgba(255,20,147,.55),transparent 66%),
    radial-gradient(64% 72% at 38% 92%,rgba(255,20,147,.34),transparent 72%),
    conic-gradient(from 190deg at 58% 44%,rgba(255,0,0,.30),rgba(255,20,147,.24),rgba(38,23,23,.04),rgba(255,0,0,.30));
  filter:blur(72px) saturate(1.25);
  animation:aurora 10s ease-in-out infinite alternate;
}

body::after{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background:repeating-linear-gradient(115deg,rgba(255,255,255,.05) 0 1px,transparent 1px 5px);
  opacity:.35;
  mix-blend-mode:screen;
}

@keyframes aurora{
  0%{transform:translate3d(-2%,-1%,0) scale(1.04) rotate(-1deg)}
  50%{transform:translate3d(2%,2%,0) scale(1.12) rotate(1.5deg)}
  100%{transform:translate3d(-1%,3%,0) scale(1.06) rotate(-2deg)}
}

img{max-width:100%;height:auto}
a{color:var(--pink)}
a:focus-visible,
button:focus-visible{outline:2px solid var(--pink);outline-offset:3px}

h1,h2,h3,h4{font-family:var(--head);font-weight:700;letter-spacing:-.015em;line-height:1.15}

/* 底部固定条 */
.dock{
  position:fixed;
  left:0;right:0;bottom:0;
  z-index:60;
  padding:6px 12px calc(6px + env(safe-area-inset-bottom));
  background:rgba(38,23,23,.78);
  border-top:1px solid var(--line-hot);
  backdrop-filter:blur(20px) saturate(1.4);
  -webkit-backdrop-filter:blur(20px) saturate(1.4);
}

.dock ol{
  list-style:none;
  margin:0 auto;
  padding:0;
  max-width:1240px;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:center;
  gap:2px;
}

.dock li{display:flex}

.dock a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:0 10px;
  color:var(--dim);
  text-decoration:none;
  font-size:16px;
  letter-spacing:.02em;
  transition:color .22s ease,background .22s ease;
}

.dock a:hover,
.dock a:focus-visible,
.dock a.on{color:#fff}

.dock a.on{box-shadow:inset 0 -2px 0 var(--pink)}

.dock .brand{margin-inline:auto}

.dock .brand a{
  gap:8px;
  font-family:var(--head);
  font-weight:700;
  font-size:18px;
  letter-spacing:.07em;
  color:#fff;
}

.dock .brand a::before{
  content:"";
  width:9px;height:9px;
  background:linear-gradient(135deg,var(--red),var(--pink));
  box-shadow:0 0 14px rgba(255,20,147,.85);
}

.dock .cta a{
  padding:0 18px;
  color:#fff;
  font-weight:600;
  background:linear-gradient(100deg,var(--red),var(--pink));
}

/* 首屏 */
.hero{
  position:relative;
  min-height:100vh;
  min-height:100svh;
  display:flex;
  align-items:flex-end;
  overflow:hidden;
  isolation:isolate;
}

.hero-media{position:absolute;inset:0;z-index:-1}

.hero-media::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(38,23,23,.30) 0%,rgba(38,23,23,.55) 46%,rgba(38,23,23,.96) 100%);
}

.hero-img{width:100%;height:100%;object-fit:cover;display:block}

.hero-inner{
  width:100%;
  max-width:1240px;
  margin:0 auto;
  padding:120px 20px 92px;
  text-align:left;
}

.hero-title{
  margin:0 0 16px;
  font-size:clamp(2.3rem,7vw,4.6rem);
  line-height:1.02;
  letter-spacing:-.035em;
  background:linear-gradient(100deg,#fff 8%,#ffb6d8 42%,var(--pink) 70%,var(--red) 96%);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}

.hero-desc{
  margin:0;
  max-width:46ch;
  color:var(--dim);
  font-size:1.05rem;
}

/* 正文舞台 */
.stage{
  max-width:1240px;
  margin:0 auto;
  padding:44px 20px 88px;
  display:grid;
  grid-template-columns:232px minmax(0,1fr);
  gap:44px;
  align-items:start;
}

.toc{
  position:sticky;
  top:28px;
  padding:18px 16px;
  background:var(--glass);
  border:1px solid var(--line);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
}

.toc h2{
  margin:0;
  font-size:1rem;
  font-weight:600;
  letter-spacing:.22em;
  color:var(--pink);
}

.toc hr{
  border:0;
  height:1px;
  margin:10px 0 12px;
  background:linear-gradient(90deg,var(--pink),transparent);
}

.toc ol{list-style:none;margin:0;padding:0}

.toc li a{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:8px 0;
  font-size:16px;
  color:var(--dim);
  text-decoration:none;
  border-bottom:1px solid rgba(255,255,255,.07);
  transition:color .22s ease,padding-left .22s ease;
}

.toc li:last-child a{border-bottom:0}

.toc li a:hover,
.toc li a:focus-visible{color:#fff;padding-left:7px}

.content{min-width:0;overflow-wrap:anywhere}

.content > section{
  padding:52px 0;
  border-top:1px solid var(--line);
  scroll-margin-top:28px;
}

.content > section:first-child{border-top:0;padding-top:0}

.content > section:nth-child(even){
  padding:36px 22px;
  margin:26px 0;
  border:1px solid var(--line);
  background:var(--glass);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
}

.content h2{
  margin:0 0 16px;
  font-size:clamp(1.5rem,3.4vw,2.1rem);
}

.content h3{margin:28px 0 10px;font-size:1.22rem}

.content p{margin:0 0 16px;color:#f0e4e4}

.content ul,.content ol{padding-left:1.25em;margin:0 0 18px}

.content li{margin:6px 0}

.content blockquote{
  margin:22px 0;
  padding:14px 18px;
  border-left:3px solid var(--pink);
  background:var(--glass);
}

.content hr{
  border:0;
  height:1px;
  margin:26px 0;
  background:var(--line);
}

.content img{
  display:block;
  margin:22px 0;
  border:1px solid var(--line);
}

.content table{width:100%;border-collapse:collapse;font-size:16px}
.content th,.content td{border:1px solid var(--line);padding:10px;text-align:left}
.content code{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:15px}

/* 页脚 */
.foot{
  border-top:1px solid var(--line-hot);
  background:rgba(20,10,11,.55);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
}

.foot section{
  max-width:1240px;
  margin:0 auto;
  padding:40px 20px;
}

.foot-cta{border-bottom:1px solid var(--line)}

.foot-cta h2{
  margin:0 0 12px;
  font-size:clamp(1.6rem,4vw,2.6rem);
  background:linear-gradient(100deg,#fff,var(--pink) 70%,var(--red));
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}

.foot-cta hr{
  border:0;
  height:1px;
  margin:0 0 22px;
  background:linear-gradient(90deg,var(--pink),var(--red),transparent);
}

.foot-btn{
  display:inline-flex;
  align-items:center;
  min-height:48px;
  padding:0 26px;
  color:#fff;
  font-weight:600;
  letter-spacing:.05em;
  text-decoration:none;
  background:linear-gradient(100deg,var(--red),var(--pink));
  transition:filter .22s ease,transform .22s ease;
}

.foot-btn:hover{filter:saturate(1.3) brightness(1.1);transform:translateY(-2px)}

.foot-links ol{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-wrap:wrap;
  gap:4px 22px;
}

.foot-links a{
  display:flex;
  align-items:center;
  min-height:42px;
  padding:4px 0;
  font-size:16px;
  color:var(--dim);
  text-decoration:none;
}

.foot-links a:hover,
.foot-links a:focus-visible{color:#fff}

.foot-base{border-top:1px solid var(--line)}

.foot-base p{
  margin:0;
  text-align:center;
  color:var(--dim);
  font-size:16px;
}

/* 滚动出现 */
.reveal{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .7s ease,transform .7s ease;
}

.reveal.in{opacity:1;transform:none}

@media (max-width:760px){
  body{padding-bottom:132px;font-size:16px}

  .dock{padding:4px 8px calc(4px + env(safe-area-inset-bottom))}

  .dock .brand{
    order:-1;
    flex:0 0 100%;
    justify-content:center;
    margin:0 0 2px;
  }

  .dock a{font-size:16px;padding:0 8px}

  .dock .cta a{padding:0 14px}

  .hero-inner{padding:96px 16px 72px}

  .hero-desc{font-size:1rem}

  .stage{
    grid-template-columns:minmax(0,1fr);
    gap:26px;
    padding:32px 16px 56px;
  }

  .toc{position:static;padding:14px}

  .toc li a{min-height:40px}

  .content > section{padding:38px 0}

  .content > section:nth-child(even){padding:28px 16px;margin:22px 0}

  .foot section{padding:32px 16px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  body::before{animation:none}
  .reveal{opacity:1;transform:none;transition:none}
  *{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
}

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