:root{
  --ink:#261717;
  --ink-deep:#170d0d;
  --ink-soft:#1a0e0e;
  --red:#ff0000;
  --pink:#ff1493;
  --cream:#fdeff1;
  --dim:#ccb1b5;
  --line:rgba(255,255,255,.12);
  --rail:262px;
  --serif:"Bodoni Moda",Georgia,"Times New Roman",serif;
  --sans:"Jost",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{background:var(--ink-deep);scroll-behavior:smooth;-webkit-text-size-adjust:100%;overflow-x:hidden}
body{
  margin:0;font-family:var(--sans);font-size:17px;line-height:1.75;
  color:var(--cream);letter-spacing:.01em;overflow-x:hidden;background:transparent;
  width:100%;max-width:100%;
}
body::before{
  content:"";position:fixed;inset:-25% -15%;z-index:-2;pointer-events:none;
  background:
    radial-gradient(38% 34% at 18% 22%,rgba(255,0,0,.5),rgba(255,0,0,0) 68%),
    radial-gradient(42% 38% at 82% 16%,rgba(255,20,147,.44),rgba(255,20,147,0) 70%),
    radial-gradient(46% 40% at 70% 84%,rgba(255,0,0,.3),rgba(255,0,0,0) 70%),
    radial-gradient(34% 30% at 10% 80%,rgba(255,20,147,.38),rgba(255,20,147,0) 72%),
    var(--ink);
  background-size:175% 175%;
  background-position:0 0,100% 0,100% 100%,0 100%,0 0;
  filter:saturate(1.25);
  animation:aurora 10s ease-in-out infinite alternate;
}
@keyframes aurora{
  0%{background-position:0 0,100% 0,100% 100%,0 100%,0 0}
  100%{background-position:20% 24%,76% 12%,66% 76%,16% 84%,0 0}
}
body::after{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.2;
  background-image:
    linear-gradient(90deg,var(--ink-soft) 1px,transparent 1px),
    linear-gradient(var(--ink-soft) 1px,transparent 1px);
  background-size:66px 66px;mix-blend-mode:multiply;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3{font-family:var(--serif);font-weight:600;line-height:1.16;margin:0;overflow-wrap:break-word}
p{margin:0 0 1.1em}
a:focus-visible,summary:focus-visible{outline:2px solid var(--pink);outline-offset:3px;border-radius:6px}
article{scroll-margin-top:26px}

/* 左侧固定导航 */
.rail{
  position:fixed;inset:0 auto 0 0;width:var(--rail);z-index:40;
  display:flex;flex-direction:column;gap:22px;padding:34px 22px 28px;
  background:linear-gradient(180deg,rgba(38,23,23,.94),rgba(23,13,13,.9));
  border-right:1px solid var(--line);backdrop-filter:blur(10px);
}
.brand{display:flex;flex-direction:column;gap:10px;font-family:var(--serif);font-size:27px;line-height:1.1;letter-spacing:.04em}
.brand-mark{width:52px;height:52px;border-radius:14px;object-fit:cover;box-shadow:0 10px 26px rgba(255,0,0,.24)}
.brand-word{padding:2px 0;background:linear-gradient(100deg,#fff,var(--pink) 62%,var(--red));-webkit-background-clip:text;background-clip:text;color:transparent}
.menu-wrap summary{
  list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;
  min-height:44px;padding:0 16px;border:1px solid var(--line);border-radius:999px;
  font-size:13.5px;letter-spacing:.2em;color:var(--dim);
}
.menu-wrap summary::-webkit-details-marker{display:none}
.menu-wrap summary::after{
  content:"";width:8px;height:8px;margin-right:2px;
  border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;
  transform:rotate(45deg);transition:transform .3s ease;
}
.menu-wrap[open] summary::after{transform:rotate(-135deg)}
.menu-wrap menu{margin:14px 0 0;padding:0;list-style:none;display:flex;flex-direction:column;gap:9px}
.menu-wrap menu a{
  display:flex;align-items:center;min-height:44px;padding:0 16px;border-radius:999px;
  border:1px solid transparent;background:rgba(255,255,255,.05);font-size:15px;
  transition:background .25s ease,border-color .25s ease,transform .25s ease,color .25s ease;
}
.menu-wrap menu a:hover{
  color:#fff;transform:translateX(3px);
  background:linear-gradient(100deg,rgba(255,0,0,.6),rgba(255,20,147,.55));
  border-color:rgba(255,255,255,.22);
}
.contact{
  margin-top:auto;align-self:flex-start;display:inline-flex;align-items:center;
  min-height:44px;padding:0 24px;border-radius:999px;font-size:15px;color:#fff;
  background:linear-gradient(100deg,var(--red),var(--pink));
  box-shadow:0 10px 28px rgba(255,0,0,.3);
}

main{margin-left:var(--rail);position:relative;z-index:1;overflow-x:clip}

/* 首屏 */
.hero{
  position:relative;min-height:70vh;display:flex;flex-direction:column;
  justify-content:flex-end;align-items:flex-end;text-align:right;
  padding:16vh clamp(20px,5vw,74px) 12vh;overflow:hidden;
}
.hero h1{
  max-width:15ch;font-size:clamp(2.1rem,7.4vw,5.3rem);letter-spacing:.005em;
  background:linear-gradient(95deg,#fff 12%,var(--pink) 58%,var(--red));
  -webkit-background-clip:text;background-clip:text;color:transparent;
  text-wrap:balance;position:relative;z-index:1;
}
.hero::after{
  content:"";position:absolute;left:-6%;right:-6%;bottom:-58px;height:150px;
  background:linear-gradient(95deg,var(--pink),var(--red) 55%,#ff6039);
  transform:skewY(-5deg);opacity:.78;filter:saturate(1.2) blur(1px);
  mix-blend-mode:screen;
}

/* 极光光斑 */
.aura{position:absolute;margin:0;pointer-events:none;z-index:0}
.aura span{position:absolute;display:block;border-radius:50%;filter:blur(54px);opacity:.5}
.hero .aura{top:6%;left:5%;width:54%;height:62%}
.hero .aura span:nth-child(1){inset:0 42% 52% 0;background:var(--red);animation:drift 12s ease-in-out infinite alternate}
.hero .aura span:nth-child(2){inset:42% 0 0 46%;background:var(--pink);animation:drift 9s ease-in-out infinite alternate-reverse}
.board .aura{right:0;bottom:80px;width:300px;height:300px}
.board .aura span{inset:0;background:var(--red);opacity:.28}
@keyframes drift{to{transform:translate3d(-24px,26px,0) scale(1.18)}}

/* 正文与侧栏 */
.board{
  position:relative;display:grid;grid-template-columns:224px minmax(0,1fr);
  gap:clamp(20px,3.4vw,54px);
  padding:0 clamp(20px,5vw,74px) clamp(56px,8vw,110px);
  max-width:100%;
}
.side{position:sticky;top:26px;align-self:start;padding-top:6px;z-index:2}
.side small{display:block;font-size:12px;letter-spacing:.36em;color:var(--pink);margin-bottom:7px}
.side h2{font-size:26px;letter-spacing:.03em}
.toc{margin:16px 0 20px;padding:0;list-style:none;counter-reset:toc;border-left:1px solid var(--line)}
.toc li{counter-increment:toc}
.toc a{
  display:flex;gap:10px;align-items:baseline;padding:9px 0 9px 14px;margin-left:-1px;
  font-size:14.5px;color:var(--dim);border-left:1px solid transparent;
  transition:color .2s ease,border-color .2s ease;
}
.toc a::before{content:counter(toc,decimal-leading-zero);font-family:var(--serif);font-size:12px;color:rgba(255,255,255,.34)}
.toc a:hover{color:#fff;border-left-color:var(--pink)}
.back{
  display:inline-flex;align-items:center;min-height:42px;padding:0 18px;border-radius:999px;
  border:1px solid var(--line);font-size:13.5px;color:var(--dim);transition:color .2s,border-color .2s;
}
.back:hover{color:#fff;border-color:var(--pink)}

.article{min-width:0;overflow-wrap:break-word}
.article article{padding:clamp(26px,4vw,50px) 0;border-top:1px solid var(--line)}
.article article:first-child{border-top:0;padding-top:0}
.article h2{font-size:clamp(1.6rem,3.2vw,2.3rem);margin:0 0 .6em;letter-spacing:.01em}
.article h3{font-size:1.22rem;margin:1.7em 0 .5em;color:#fff}
.article p{max-width:66ch;color:#f4e2e3}
.article ul,.article ol{max-width:66ch;padding-left:1.25em}
.article li{margin:.35em 0}
.article a{color:var(--pink);text-decoration:underline;text-underline-offset:3px;overflow-wrap:break-word}
.article strong{color:#fff}
.article blockquote{
  margin:1.5em 0;padding:15px 22px;border-left:3px solid var(--red);
  background:rgba(255,255,255,.05);border-radius:0 10px 10px 0;
}
.article img{border-radius:10px;box-shadow:0 16px 42px rgba(0,0,0,.42)}
.article table{width:100%;border-collapse:collapse;font-size:15.5px}
.article th,.article td{border-bottom:1px solid var(--line);padding:10px 8px;text-align:left}

.js .article article.rv{opacity:0;transform:translateY(20px);transition:opacity .7s cubic-bezier(.22,.61,.36,1),transform .7s cubic-bezier(.22,.61,.36,1)}
.js .article article.rv.in{opacity:1;transform:none}

/* 页脚 */
footer{
  position:relative;z-index:1;margin-left:var(--rail);
  padding:clamp(38px,5vw,64px) clamp(20px,5vw,74px) 26px;
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(23,13,13,.1),rgba(23,13,13,.92));
  display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);
  gap:4px clamp(20px,4vw,50px);align-items:start;
}
.f-lead{margin:0;font-family:var(--serif);font-size:clamp(1.5rem,3vw,2.2rem);line-height:1.15;background:linear-gradient(100deg,#fff,var(--pink));-webkit-background-clip:text;background-clip:text;color:transparent}
.f-links{margin:0;display:flex;flex-wrap:wrap;gap:0 18px}
.f-links a{display:inline-flex;align-items:center;min-height:42px;font-size:14.5px;color:var(--dim);border-bottom:1px solid transparent}
.f-links a:hover{color:#fff;border-bottom-color:var(--pink)}
.f-touch{margin:14px 0 0;font-size:14.5px;color:var(--dim)}
.f-touch a{display:inline-block;padding:10px 0;color:#fff;border-bottom:1px solid var(--pink)}
.f-bot{
  grid-column:1/-1;display:flex;flex-wrap:wrap;justify-content:space-between;
  gap:6px 20px;margin:20px 0 0;padding-top:14px;border-top:1px solid var(--line);
  font-size:12.5px;color:rgba(255,255,255,.46);
}
.f-bot small{font-size:12.5px}
.f-bot a{display:inline-block;padding:10px 0}
.f-bot a:hover{color:#fff}

.totop{
  position:fixed;right:18px;bottom:18px;z-index:50;display:inline-flex;align-items:center;
  justify-content:center;min-height:44px;padding:0 20px;border-radius:999px;font-size:13px;
  letter-spacing:.1em;color:#fff;background:rgba(38,23,23,.82);border:1px solid var(--line);
  backdrop-filter:blur(6px);opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .3s ease,transform .3s ease,visibility .3s ease;
}
.totop.on{opacity:1;visibility:visible;transform:none}

@media (max-width:900px){
  .rail{
    position:static;inset:auto;width:auto;max-width:100%;flex-direction:row;flex-wrap:wrap;
    align-items:center;gap:12px;padding:14px 16px;border-right:0;border-bottom:1px solid var(--line);
  }
  .brand{flex-direction:row;align-items:center;gap:10px;font-size:20px;min-width:0}
  .brand-mark{width:34px;height:34px;border-radius:10px;flex:none}
  .menu-wrap{flex:1 1 100%;order:3;min-width:0}
  .contact{order:2;margin:0 0 0 auto;padding:0 18px}
  main,footer{margin-left:0}
  .board{grid-template-columns:minmax(0,1fr);padding-top:8px}
  .board .aura{width:220px;height:220px;right:-6px;bottom:34px}
  .side{position:static;border-bottom:1px solid var(--line);padding-bottom:16px;margin-bottom:8px}
  .toc{margin-bottom:12px}
  .hero{min-height:auto;padding:11vh 20px 8vh}
  .hero::after{bottom:-42px;height:112px}
  .hero .aura{width:80%;height:52%}
  footer{grid-template-columns:minmax(0,1fr)}
  .f-touch{margin-top:6px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  body::before,.aura span{animation:none}
  .js .article article.rv{opacity:1;transform:none;transition:none}
  .totop,.menu-wrap summary::after,.menu-wrap menu a,.toc a,.back{transition:none}
  .menu-wrap menu a:hover{transform:none}
}

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