@import url('https://fonts.googleapis.com/css2?family=Crimson+Text:wght@400;600;700&family=EB+Garamond:wght@400;500;600;700;800&display=swap');

:root{
  --red:#ff0000;
  --pink:#ff1493;
  --ink:#261717;
  --bg:#180e0f;
  --fg:#fbecee;
  --dim:#ccb1b6;
  --glass:rgba(255,255,255,.055);
  --line:rgba(255,255,255,.14);
  --r:18px;
  --serif:"EB Garamond","Crimson Text","Songti SC","Noto Serif SC",Georgia,serif;
  --body:"Crimson Text","EB Garamond","Songti SC","Noto Serif SC",Georgia,serif;
}

*{box-sizing:border-box}

html{scroll-behavior:smooth;background:var(--bg)}

body{
  margin:0;
  min-height:100vh;
  color:var(--fg);
  background:var(--bg);
  font-family:var(--body);
  font-size:17px;
  line-height:1.72;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

body::after{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background:
    radial-gradient(120% 85% at 50% 0%, rgba(38,23,23,.30), rgba(18,10,11,.90) 72%),
    linear-gradient(180deg, rgba(24,14,15,.15), rgba(18,10,11,.75));
}

.aurora{
  position:fixed;
  inset:-22%;
  z-index:0;
  pointer-events:none;
  will-change:transform;
}

.aurora .sheet{
  position:absolute;
  inset:0;
  background-image:
    radial-gradient(36% 40% at 16% 24%, rgba(255,0,0,.55), transparent 62%),
    radial-gradient(42% 36% at 84% 14%, rgba(255,20,147,.45), transparent 64%),
    radial-gradient(46% 44% at 62% 80%, rgba(255,0,64,.36), transparent 68%),
    radial-gradient(34% 32% at 24% 90%, rgba(255,132,168,.28), transparent 70%),
    conic-gradient(from 210deg at 50% 50%, rgba(255,0,0,.22), rgba(255,20,147,.16), rgba(255,0,64,.20), rgba(255,0,0,.22));
  background-size:200% 200%,200% 200%,200% 200%,200% 200%,180% 180%;
  filter:blur(22px) saturate(1.3);
  animation:aurora 10s ease-in-out infinite alternate;
}

@keyframes aurora{
  0%{transform:translate3d(-2%,-1%,0) scale(1.04);background-position:0% 50%,100% 0%,50% 100%,20% 80%,0% 50%}
  50%{transform:translate3d(1%,1%,0) scale(1.12);background-position:40% 20%,60% 30%,30% 70%,50% 50%,40% 60%}
  100%{transform:translate3d(3%,2%,0) scale(1.18);background-position:100% 50%,0% 100%,80% 0%,90% 20%,100% 50%}
}

/* ---- 左侧竖排导航 ---- */
.rail{
  position:fixed;
  left:0;
  top:0;
  bottom:0;
  width:184px;
  z-index:6;
  display:flex;
  flex-direction:column;
  gap:24px;
  padding:22px 14px 22px 16px;
  border-right:1px solid var(--line);
  background:linear-gradient(180deg, rgba(38,23,23,.78), rgba(18,10,11,.62));
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
}

.mark{
  flex:none;
  display:flex;
  align-items:center;
  justify-content:center;
  width:48px;
  height:48px;
  border-radius:15px;
  text-decoration:none;
  color:#fff;
  font-family:var(--serif);
  font-size:22px;
  font-weight:700;
  border:1px solid rgba(255,255,255,.26);
  background:linear-gradient(140deg, rgba(255,0,0,.9), rgba(255,20,147,.78));
  box-shadow:0 10px 28px rgba(255,20,147,.34);
}

.mark img{width:30px;height:30px;object-fit:contain;border-radius:8px}

.rail-nav{min-height:0;overflow-y:auto}

.rail-nav ol{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-direction:column;
  gap:3px;
}

.rail-nav a{
  display:flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:9px 8px;
  border-radius:12px;
  border:1px solid transparent;
  color:var(--dim);
  text-decoration:none;
  font-size:16px;
  line-height:1.3;
  transition:color .25s ease, background .25s ease, border-color .25s ease;
}

.rail-nav a:hover,.rail-nav a:focus-visible{
  color:#fff;
  background:var(--glass);
  border-color:var(--line);
  outline:none;
}

.rail-nav a.on{color:#fff;background:rgba(255,20,147,.16);border-color:rgba(255,20,147,.4)}

.ico{
  flex:none;
  width:8px;
  height:8px;
  border-radius:50%;
  background:linear-gradient(140deg,var(--red),var(--pink));
  box-shadow:0 0 10px rgba(255,20,147,.85);
}

.rail-nav li:nth-child(2n) .ico{border-radius:2px;transform:rotate(45deg)}
.rail-nav li:nth-child(3n) .ico{width:9px;height:3px;border-radius:2px;transform:none}
.rail-nav li:nth-child(4n) .ico{background:none;border:1px solid rgba(255,160,190,.9);box-shadow:none}

/* ---- 页面骨架 ---- */
.page{position:relative;z-index:1;margin-left:184px}

.hero{
  min-height:45vh;
  display:flex;
  align-items:center;
  justify-content:flex-end;
  padding:52px clamp(20px,5vw,64px) 30px;
  text-align:right;
}

.hero-in{
  display:flex;
  align-items:center;
  justify-content:flex-end;
  gap:clamp(14px,3vw,26px);
}

.hero h1{
  margin:0;
  font-family:var(--serif);
  font-weight:700;
  font-size:clamp(30px,4.6vw,56px);
  line-height:1.16;
  letter-spacing:.005em;
  color:#fff;
  background:linear-gradient(115deg,#ffffff 12%,#ffd9e6 46%,#ff5c86 92%);
  -webkit-background-clip:text;
  background-clip:text;
  -webkit-text-fill-color:transparent;
  max-width:16ch;
  text-wrap:balance;
}

.glyph{
  position:relative;
  flex:none;
  width:clamp(54px,7vw,76px);
  height:clamp(54px,7vw,76px);
  display:grid;
  place-items:center;
  border-radius:22px;
  overflow:hidden;
  font-family:var(--serif);
  font-size:clamp(20px,2.6vw,28px);
  font-weight:700;
  color:#fff;
  border:1px solid rgba(255,255,255,.24);
  background:radial-gradient(circle at 30% 24%, rgba(255,20,147,.62), rgba(255,0,0,.28) 58%, rgba(255,255,255,.06));
  box-shadow:0 14px 44px rgba(255,0,0,.34);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
  will-change:transform;
}

.glyph::before{
  content:"";
  position:absolute;
  inset:-40%;
  z-index:-1;
  background:conic-gradient(from 0deg, rgba(255,0,0,.55), rgba(255,20,147,.1), rgba(255,255,255,.4), rgba(255,0,0,.55));
  animation:spin 9s linear infinite;
  opacity:.75;
}

@keyframes spin{to{transform:rotate(360deg)}}

.glyph img{width:60%;height:60%;object-fit:contain;border-radius:10px}

/* ---- 正文 ---- */
.wrap{
  max-width:1180px;
  margin:0 auto;
  padding:6px clamp(16px,4vw,46px) 56px;
}

.stage{
  display:grid;
  grid-template-columns:214px minmax(0,1fr);
  gap:26px;
  align-items:start;
}

.side{
  position:sticky;
  top:24px;
  padding:15px 14px;
  border-radius:var(--r);
  border:1px solid var(--line);
  background:var(--glass);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
}

.side-h{
  margin:0 0 10px;
  font-family:var(--serif);
  font-size:15px;
  font-weight:600;
  letter-spacing:.22em;
  color:#ffaec8;
}

.side-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:1px}

.side-list a{
  display:flex;
  align-items:baseline;
  gap:9px;
  min-height:40px;
  padding:8px 6px;
  color:var(--dim);
  text-decoration:none;
  font-size:16px;
  line-height:1.35;
  border-radius:10px;
  transition:color .2s ease, background .2s ease;
}

.side-list a:hover,.side-list a:focus-visible{color:#fff;background:rgba(255,255,255,.07);outline:none}

.side-list b{
  font-family:var(--serif);
  font-size:13px;
  font-weight:600;
  color:#ff7fa8;
  min-width:1.5em;
}

.prose{
  border-radius:var(--r);
  padding:clamp(18px,3vw,34px) clamp(16px,3vw,34px) clamp(24px,4vw,44px);
  border:1px solid var(--line);
  background:linear-gradient(180deg, rgba(255,255,255,.075), rgba(255,255,255,.032));
  -webkit-backdrop-filter:blur(16px);
  backdrop-filter:blur(16px);
  box-shadow:0 22px 62px rgba(0,0,0,.34);
  overflow-wrap:break-word;
}

.prose h2{
  font-family:var(--serif);
  font-weight:700;
  font-size:clamp(23px,2.5vw,31px);
  line-height:1.28;
  margin:0 0 .52em;
  color:#fff;
}

.prose hr{
  border:0;
  height:1px;
  margin:0 0 1.35em;
  background:linear-gradient(90deg, var(--pink), rgba(255,0,0,.55) 45%, rgba(255,255,255,0));
}

.prose h3,.prose article h2{
  font-family:var(--serif);
  font-weight:700;
  font-size:clamp(20px,2.1vw,26px);
  line-height:1.3;
  margin:1.5em 0 .5em;
  color:#fff;
}

.prose article h2{margin-top:.2em}

.prose article{
  padding:24px 0;
  border-bottom:1px solid rgba(255,255,255,.09);
  scroll-margin-top:86px;
}

.prose article:last-child{border-bottom:0;padding-bottom:0}
.prose article:first-child{padding-top:4px}

.prose p{margin:0 0 1.05em}
.prose p:last-child{margin-bottom:0}
.prose a{color:#ffa2be;text-underline-offset:3px}
.prose a:hover{color:#fff}
.prose ul,.prose ol{margin:0 0 1.05em;padding-left:1.35em}
.prose li{margin:.32em 0}
.prose strong{color:#fff;font-weight:700}
.prose blockquote{
  margin:1.2em 0;
  padding:.35em 0 .35em 1em;
  border-left:2px solid rgba(255,20,147,.75);
  color:#ffd9e4;
}
.prose img{max-width:100%;height:auto;border-radius:14px;margin:1em 0}
.prose code{font-size:.95em;background:rgba(255,255,255,.09);padding:.1em .4em;border-radius:6px}
.prose hr+article{padding-top:24px}

/* ---- 页脚 ---- */
footer{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto auto;
  align-items:center;
  gap:22px;
  margin-top:8px;
  padding:26px clamp(16px,4vw,46px) 34px;
  border-top:1px solid var(--line);
  background:linear-gradient(0deg, rgba(38,23,23,.72), rgba(38,23,23,0));
}

.f-brand{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;min-width:0}

.f-mark{
  align-self:center;
  flex:none;
  width:38px;
  height:38px;
  display:grid;
  place-items:center;
  border-radius:12px;
  font-family:var(--serif);
  font-size:17px;
  font-weight:700;
  color:#fff;
  border:1px solid rgba(255,255,255,.22);
  background:linear-gradient(140deg, rgba(255,0,0,.85), rgba(255,20,147,.7));
}

.f-mark img{width:22px;height:22px;object-fit:contain;border-radius:6px}

.f-word{
  font-family:var(--serif);
  font-weight:800;
  font-size:clamp(28px,5.4vw,58px);
  line-height:1.02;
  letter-spacing:-.01em;
  color:#fff;
  background:linear-gradient(100deg,#ffffff 8%,#ffb3c9 58%,#ff2d6a);
  -webkit-background-clip:text;
  background-clip:text;
  -webkit-text-fill-color:transparent;
  max-width:100%;
}

.f-brand small{display:block;flex-basis:100%;color:var(--dim);font-size:16px;line-height:1.55;max-width:38ch}

.f-nav ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:2px}

.f-nav a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:6px 10px;
  border-radius:10px;
  color:var(--dim);
  text-decoration:none;
  font-size:16px;
  transition:color .2s ease, background .2s ease;
}

.f-nav a:hover,.f-nav a:focus-visible{color:#fff;background:rgba(255,255,255,.08);outline:none}

.f-copy{color:#a98f94;font-size:16px;white-space:nowrap}

/* ---- 中屏 ---- */
@media (max-width:1180px){
  .stage{grid-template-columns:186px minmax(0,1fr);gap:20px}
}

@media (max-width:1040px){
  footer{grid-template-columns:minmax(0,1fr);align-items:start}
  .f-copy{white-space:normal}
}

/* ---- 窄屏 ---- */
@media (max-width:900px){
  .rail{
    left:0;
    right:0;
    bottom:auto;
    width:auto;
    flex-direction:row;
    align-items:center;
    gap:10px;
    padding:8px 12px;
    border-right:0;
    border-bottom:1px solid var(--line);
  }

  .rail-nav{flex:1;min-width:0;overflow-x:auto;overflow-y:hidden;-webkit-overflow-scrolling:touch;scrollbar-width:none}
  .rail-nav::-webkit-scrollbar{display:none}

  .rail-nav ol{flex-direction:row;gap:4px}

  .rail-nav a{white-space:nowrap;padding:8px 11px;min-height:44px}

  .page{margin-left:0;padding-top:62px}

  .hero{min-height:auto;padding:24px 18px 10px;justify-content:flex-end}

  .hero h1{font-size:clamp(26px,7.6vw,36px);max-width:14ch}

  .wrap{padding:8px 14px 34px}
  .stage{grid-template-columns:minmax(0,1fr);gap:16px}
  .side{position:static;top:auto;padding:12px 12px 14px}
  .side-list{flex-direction:row;flex-wrap:wrap;gap:4px}
  .side-list a{min-height:40px;padding:6px 9px;background:rgba(255,255,255,.05);border-radius:10px}
  .side-list b{display:none}

  .prose{padding:18px 15px 26px}
  .prose article{scroll-margin-top:74px}
  .prose h3,.prose article h2{font-size:20px}

  footer{padding:22px 16px 30px;gap:14px}
  .f-nav ol{gap:4px}
}

@media (max-width:420px){
  .f-word{font-size:32px}
  .hero-in{gap:12px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{animation:none!important;transition:none!important}
  .glyph,.aurora{transform:none!important}
}

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