@import url('https://fonts.googleapis.com/css2?family=Abril+Fatface&family=Merriweather:wght@300;400;700&display=swap');

:root{
  --ink:#261717;
  --ink-2:#170d0e;
  --red:#ff0000;
  --pink:#ff1493;
  --violet:#7a2bff;
  --amber:#ffb43a;
  --paper:#2c1a1b;
  --text:#fff4f2;
  --dim:#e6cdc9;
  --line:rgba(255,255,255,.13);
  --r:28px;
  --max:1160px;
  --serif:'Abril Fatface','Merriweather',"Songti SC","Noto Serif SC",Georgia,serif;
  --body:'Merriweather',"Songti SC","Noto Serif SC",Georgia,serif;
}

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

html{
  background:var(--ink-2);
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}

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

body::before{
  content:"";
  position:fixed;
  inset:-25%;
  z-index:-3;
  pointer-events:none;
  background:
    radial-gradient(38% 44% at 18% 22%, rgba(255,0,0,.55), transparent 70%),
    radial-gradient(42% 40% at 82% 16%, rgba(255,20,147,.5), transparent 70%),
    radial-gradient(56% 58% at 62% 84%, rgba(122,43,255,.42), transparent 72%),
    radial-gradient(28% 30% at 28% 88%, rgba(255,180,58,.3), transparent 70%);
  filter:blur(42px) saturate(1.25);
  animation:drift 11s ease-in-out infinite alternate;
}

body::after{
  content:"";
  position:fixed;
  inset:-10%;
  z-index:-2;
  pointer-events:none;
  background:conic-gradient(from 200deg at 50% 10%,
    rgba(255,0,0,.24), rgba(255,20,147,.14),
    rgba(122,43,255,.24), rgba(255,0,0,.24));
  mix-blend-mode:screen;
  opacity:.5;
  animation:turn 12s linear infinite;
}

@keyframes drift{
  0%{transform:translate3d(-2%,-1%,0) scale(1)}
  100%{transform:translate3d(3%,2%,0) scale(1.08)}
}
@keyframes turn{
  0%{transform:rotate(0deg)}
  100%{transform:rotate(6deg) scale(1.04)}
}

a{color:inherit}
:focus-visible{outline:2px solid var(--amber);outline-offset:3px}

/* ---------- 顶栏 ---------- */
.top{
  position:sticky;
  top:0;
  z-index:60;
  background:linear-gradient(180deg, rgba(23,13,14,.95), rgba(23,13,14,.72));
  backdrop-filter:blur(16px);
  border-bottom:1px solid var(--line);
}
.top-in{
  max-width:var(--max);
  margin:0 auto;
  padding:8px 16px;
}
.nav{display:block}
.nav > summary{
  display:none;
  list-style:none;
  cursor:pointer;
  align-items:center;
  gap:9px;
  min-height:44px;
  padding:0 18px;
  border-radius:999px;
  background:rgba(255,255,255,.1);
  color:var(--text);
  font-size:16px;
  width:max-content;
  user-select:none;
}
.nav > summary::-webkit-details-marker{display:none}
.nav > summary::after{
  content:"";
  width:9px;
  height:9px;
  border-right:2px solid currentColor;
  border-bottom:2px solid currentColor;
  transform:rotate(45deg) translateY(-2px);
  transition:transform .25s ease;
}
.nav[open] > summary::after{transform:rotate(225deg) translateY(-2px)}

.rail{
  display:flex;
  align-items:center;
  gap:2px;
  list-style:none;
  margin:0;
  padding:0;
}
.rail li{min-width:0}
.rail a{
  display:flex;
  align-items:center;
  gap:7px;
  min-height:44px;
  padding:0 11px;
  border-radius:999px;
  color:var(--text);
  text-decoration:none;
  font-size:16px;
  line-height:1;
  white-space:nowrap;
}
.rail a:hover,.rail a:focus-visible{background:rgba(255,20,147,.2)}
.ic{
  width:8px;
  height:8px;
  flex:0 0 auto;
  border-radius:2px;
  transform:rotate(45deg);
  background:linear-gradient(135deg,var(--red),var(--pink));
  box-shadow:0 0 10px rgba(255,20,147,.9);
}
.brandcell{margin-inline:auto}
.brandcell a{
  padding:0 18px;
  font-family:var(--serif);
  font-size:22px;
  letter-spacing:.02em;
  background:linear-gradient(100deg,#fff,#ffc7e5 55%,var(--pink));
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.brandcell a:hover{
  background:linear-gradient(100deg,#fff,var(--pink));
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.cta-tab a{
  background:linear-gradient(100deg,var(--red),var(--pink));
  color:#fff;
  font-weight:700;
  padding:0 20px;
  box-shadow:0 12px 26px -12px rgba(255,0,0,.95);
}
.cta-tab a:hover,.cta-tab a:focus-visible{
  background:linear-gradient(100deg,var(--pink),var(--violet));
  color:#fff;
}

/* ---------- 头图 ---------- */
.hero{
  position:relative;
  isolation:isolate;
  overflow:hidden;
  display:flex;
  align-items:flex-end;
  min-height:44vh;
  background:conic-gradient(from 160deg at 24% 18%,
    #ff0000, #ff1493 32%, #7a2bff 62%, #ffb43a 84%, #ff0000);
  background-size:180% 180%;
  animation:shift 10s ease-in-out infinite alternate;
}
@keyframes shift{
  0%{background-position:0% 40%}
  100%{background-position:100% 65%}
}
.hero-img{
  position:absolute;
  inset:0;
  z-index:-2;
  width:100%;
  height:100%;
  object-fit:cover;
  opacity:.52;
  -webkit-mask-image:linear-gradient(180deg,#000 45%, rgba(0,0,0,.3));
  mask-image:linear-gradient(180deg,#000 45%, rgba(0,0,0,.3));
}
.hero-veil{
  position:absolute;
  inset:0;
  z-index:-1;
  background:linear-gradient(104deg, rgba(23,13,14,.92) 0%, rgba(23,13,14,.6) 48%, rgba(23,13,14,.2) 100%);
}
.hero-txt{
  width:100%;
  max-width:var(--max);
  margin:0 auto;
  padding:56px 20px 46px;
  text-align:left;
}
.hero h1{
  margin:0 0 14px;
  font-family:var(--serif);
  font-weight:400;
  font-size:clamp(30px, 5.4vw, 56px);
  line-height:1.14;
  letter-spacing:.01em;
  text-shadow:0 10px 34px rgba(0,0,0,.6);
}
.lede{
  margin:0;
  max-width:44ch;
  font-size:17px;
  color:#ffe9ef;
  text-shadow:0 2px 14px rgba(0,0,0,.5);
}
.slash{
  position:absolute;
  left:0;
  right:0;
  bottom:-2px;
  height:22px;
  background:linear-gradient(90deg,var(--red),var(--pink) 48%,var(--violet));
  clip-path:polygon(0 100%, 100% 0, 100% 100%);
}

/* ---------- 主体骨架 ---------- */
.wrap{
  display:grid;
  grid-template-columns:225px minmax(0,1fr);
  gap:28px;
  align-items:start;
  max-width:var(--max);
  margin:0 auto;
  padding:36px 18px 64px;
}
.side{
  position:sticky;
  top:84px;
  background:rgba(255,255,255,.07);
  border-radius:var(--r);
  padding:20px 18px;
  backdrop-filter:blur(8px);
}
.side h2{
  margin:0 0 10px;
  font-family:var(--serif);
  font-weight:400;
  font-size:19px;
  letter-spacing:.05em;
  color:#ffd9e6;
}
.side hr{
  border:0;
  height:2px;
  margin:0 0 14px;
  background:linear-gradient(90deg,var(--pink),transparent);
}
.jump{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-direction:column;
  gap:2px;
}
.jump a{
  display:block;
  padding:11px 12px;
  min-height:44px;
  border-radius:14px;
  text-decoration:none;
  font-size:16px;
  line-height:1.3;
}
.jump a:hover{background:rgba(255,20,147,.22)}

.body{min-width:0}

/* ---------- 正文 ---------- */
.prose{min-width:0}
.prose > section{
  background:var(--paper);
  border-radius:var(--r);
  padding:28px 26px 32px;
  margin:0 0 24px;
  scroll-margin-top:96px;
  box-shadow:0 30px 56px -40px #000;
}
.prose > section:last-child{margin-bottom:0}
.prose > section:nth-child(even){
  background:linear-gradient(180deg,#301d1e,#2a191a);
}

.prose h2{
  margin:0 0 12px;
  font-family:var(--serif);
  font-weight:400;
  font-size:clamp(23px, 3vw, 33px);
  line-height:1.28;
  letter-spacing:.01em;
  color:#fff0f4;
}
.prose h3{
  margin:26px 0 10px;
  font-family:var(--serif);
  font-weight:400;
  font-size:clamp(19px, 2.2vw, 23px);
  line-height:1.35;
  color:#ffe0ec;
}
.prose hr{
  border:0;
  height:2px;
  margin:0 0 20px;
  background:linear-gradient(90deg,var(--pink),rgba(255,20,147,.12));
}
.prose p{margin:0 0 16px}
.prose ul,.prose ol{margin:0 0 18px;padding-left:22px}
.prose li{margin-bottom:8px}
.prose a{color:#ffa6cf;text-underline-offset:3px}
.prose strong{color:#fff}
.prose code{
  font-size:.95em;
  padding:1px 6px;
  border-radius:6px;
  background:rgba(255,255,255,.1);
}
.prose blockquote{
  margin:0 0 18px;
  padding:14px 20px;
  border-left:4px solid var(--pink);
  border-radius:0 18px 18px 0;
  background:rgba(255,255,255,.06);
}
.prose img,.prose figure img{
  display:block;
  max-width:100%;
  height:auto;
  border-radius:18px;
}
.prose figure{margin:0 0 18px}
.prose figcaption{font-size:15px;color:var(--dim);margin-top:8px}
.prose table{width:100%;border-collapse:collapse;font-size:16px;margin:0 0 18px}
.prose th,.prose td{padding:10px;text-align:left;border-bottom:1px solid var(--line)}
.prose th{color:#ffd9e6}

/* ---------- 页脚 ---------- */
.foot{
  margin-top:24px;
  border-top:1px solid var(--line);
  background:linear-gradient(180deg, rgba(23,13,14,.55), rgba(23,13,14,.97));
}
.foot-in{
  display:grid;
  grid-template-columns:1.7fr 1fr 1fr;
  gap:30px;
  max-width:var(--max);
  margin:0 auto;
  padding:44px 18px 12px;
}
.foot dt{
  font-family:var(--serif);
  font-size:18px;
  line-height:1.4;
  margin-bottom:10px;
  color:#ffd9e6;
}
.foot dd{margin:0 0 6px;font-size:16px;color:var(--dim)}
.foot dd a{
  display:inline-block;
  min-height:40px;
  line-height:40px;
  text-decoration:none;
  color:var(--text);
}
.foot dd a:hover{color:#ffa6cf}
.foot code{font-size:15px;color:#ffc9de;word-break:break-all}
.cr{
  max-width:var(--max);
  margin:0 auto;
  padding:8px 18px 32px;
  font-size:15px;
  color:#c8a9a7;
}

/* ---------- 滚动显现 ---------- */
.rv{opacity:0;transform:translateY(16px);transition:opacity .7s ease, transform .7s ease}
.rv.in{opacity:1;transform:none}

/* ---------- 窄屏 ---------- */
@media (max-width:899px){
  .top-in{padding:8px 12px}
  .nav > summary{display:flex}
  .rail{
    flex-direction:column;
    align-items:stretch;
    gap:4px;
    padding:10px 0 4px;
  }
  .rail a{min-height:46px;padding:0 14px;border-radius:16px;background:rgba(255,255,255,.06)}
  .brandcell{order:-1;margin-inline:0}
  .brandcell a{justify-content:center;font-size:20px}
  .nav:not([open]) .rail{display:flex;padding:4px 0}
  .nav:not([open]) .rail li:not(.brandcell){display:none}

  .hero{min-height:40vh}
  .hero-txt{padding:40px 16px 34px}
  .lede{font-size:16px}

  .wrap{grid-template-columns:minmax(0,1fr);gap:16px;padding:20px 12px 44px}
  .side{position:static;padding:16px}
  .jump{flex-direction:row;flex-wrap:wrap;gap:6px}
  .jump a{background:rgba(255,255,255,.07);padding:10px 13px}

  .prose > section{padding:22px 18px 24px;border-radius:22px;scroll-margin-top:78px}

  .foot-in{grid-template-columns:1fr 1fr;gap:22px}
  .foot-in dl:first-child{grid-column:1 / -1}
}

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

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