:root{
  --ink:#26171f;
  --pink:#ff0080;
  --mag:#ff00ff;
  --violet:#9b6bff;
  --paper:#f9eff6;
  --muted:#cbb2c1;
  --card:rgba(26,14,22,.76);
  --line:rgba(255,0,255,.2);
  --font-body:system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-display:"Syncopate",system-ui,"PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"Space Mono",ui-monospace,SFMono-Regular,monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{background:#120a10;scroll-behavior:smooth;-webkit-text-size-adjust:100%}
html.lock{overflow:hidden}
body{
  margin:0;min-height:100vh;position:relative;overflow-x:hidden;
  background:#120a10;color:var(--paper);
  font-family:var(--font-body);font-size:17px;line-height:1.78;
  -webkit-font-smoothing:antialiased;
}
body::before{
  content:"";position:fixed;inset:-25% -20%;z-index:-2;
  background:
    radial-gradient(38% 40% at 16% 20%,rgba(255,0,128,.62),transparent 68%),
    radial-gradient(34% 36% at 84% 12%,rgba(255,0,255,.5),transparent 70%),
    radial-gradient(48% 46% at 66% 78%,rgba(122,40,255,.46),transparent 72%),
    radial-gradient(40% 40% at 6% 88%,rgba(0,214,255,.24),transparent 70%);
  background-blend-mode:screen;
  filter:blur(48px) saturate(1.25);opacity:.58;
  animation:aurora 26s ease-in-out infinite alternate;
}
body::after{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:repeating-linear-gradient(112deg,rgba(255,255,255,.055) 0 1px,transparent 1px 7px);
  background-size:420px 420px;
  mix-blend-mode:screen;opacity:.45;
  animation:sheen 18s linear infinite;
}
@keyframes aurora{
  0%{transform:translate3d(-2%,-1%,0) scale(1.04);filter:blur(48px) hue-rotate(0deg) saturate(1.25)}
  50%{transform:translate3d(2%,2%,0) scale(1.14);filter:blur(54px) hue-rotate(26deg) saturate(1.35)}
  100%{transform:translate3d(-1%,3%,0) scale(1.09);filter:blur(50px) hue-rotate(-16deg) saturate(1.2)}
}
@keyframes sheen{to{background-position:420px 0}}
::selection{background:var(--mag);color:#12070d}
:focus-visible{outline:2px solid #ff5fae;outline-offset:3px;border-radius:6px}
a{color:#ff77bd}
a:hover{color:#fff}
.skip{
  position:absolute;left:12px;top:-60px;z-index:80;
  padding:10px 16px;background:#fff;color:#1a0d14;border-radius:999px;
  font-size:.85rem;text-decoration:none;transition:top .25s ease;
}
.skip:focus{top:12px}

/* ---------- 顶栏 ---------- */
.top{
  position:sticky;top:0;z-index:40;
  backdrop-filter:blur(16px) saturate(1.3);
  background:linear-gradient(180deg,rgba(18,10,16,.94),rgba(18,10,16,.45));
  border-bottom:1px solid var(--line);
}
.top-bar{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  max-width:1400px;margin:0 auto;padding:14px clamp(16px,4vw,44px) 4px;
}
.brand{
  display:inline-flex;align-items:center;min-height:40px;padding-right:.44em;
  font-family:var(--font-display);font-weight:700;font-size:1.06rem;
  letter-spacing:.44em;text-decoration:none;text-transform:uppercase;
  background:linear-gradient(94deg,#ff0080,#ff00ff 58%,#a98bff);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
  filter:drop-shadow(0 0 22px rgba(255,0,160,.5));
}
.pulse{
  width:9px;height:9px;border-radius:50%;flex:0 0 auto;
  background:radial-gradient(circle,#fff,var(--pink) 60%,transparent 72%);
  box-shadow:0 0 18px 4px rgba(255,0,128,.55);
  animation:pulse 2.6s ease-in-out infinite;
}
@keyframes pulse{50%{transform:scale(1.5);opacity:.55}}
.top-rail{
  display:flex;align-items:center;gap:12px;
  max-width:1400px;margin:0 auto;padding:0 clamp(16px,4vw,44px) 13px;
}
.burger{
  display:inline-flex;align-items:center;gap:10px;min-height:44px;
  padding:0 18px;border-radius:999px;cursor:pointer;
  border:1px solid rgba(255,0,255,.36);background:rgba(255,0,128,.13);
  color:#fff;font:inherit;font-size:.85rem;letter-spacing:.2em;
  transition:background .25s ease,border-color .25s ease;
}
.burger:hover{background:rgba(255,0,128,.28);border-color:var(--mag)}
.burger-lines{width:18px;height:2px;background:#fff;border-radius:2px;box-shadow:0 6px 0 #fff,0 -6px 0 #fff}
.find{flex:1 1 auto;max-width:340px;margin:0}
.find input{
  width:100%;min-height:44px;padding:0 18px;border-radius:999px;
  border:1px solid rgba(255,255,255,.18);background:rgba(255,255,255,.07);
  color:#fff;font:inherit;font-size:.9rem;
}
.find input::placeholder{color:rgba(249,239,246,.6)}
.find input:focus{background:rgba(255,255,255,.13);border-color:var(--mag);outline:none}

/* ---------- 全屏菜单 ---------- */
.veil{
  position:fixed;inset:0;z-index:60;
  display:grid;grid-template-rows:auto 1fr;
  background:
    radial-gradient(70% 60% at 80% 8%,rgba(255,0,128,.34),transparent 65%),
    radial-gradient(60% 60% at 10% 92%,rgba(155,107,255,.32),transparent 68%),
    rgba(13,7,12,.97);
  opacity:0;visibility:hidden;transition:opacity .35s ease,visibility .35s ease;
}
.veil.on{opacity:1;visibility:visible}
.veil-head{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px clamp(16px,4vw,44px);
  border-bottom:1px solid var(--line);
}
.veil-brand{
  font-family:var(--font-display);font-weight:700;letter-spacing:.42em;
  font-size:.95rem;
  background:linear-gradient(94deg,#ff0080,#ff00ff);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.veil-close{
  min-height:44px;padding:0 20px;border-radius:999px;cursor:pointer;
  border:1px solid rgba(255,255,255,.28);background:transparent;
  color:#fff;font:inherit;font-size:.82rem;letter-spacing:.2em;
  transition:background .25s ease;
}
.veil-close:hover{background:rgba(255,255,255,.12)}
.veil-nav{overflow-y:auto;padding:clamp(20px,5vh,52px) clamp(16px,4vw,44px) 60px}
.veil-nav ol{list-style:none;margin:0;padding:0;counter-reset:vn}
.veil-nav li{counter-increment:vn;border-bottom:1px solid rgba(255,255,255,.08)}
.veil-nav li.off{display:none}
.veil-nav a{
  display:flex;align-items:baseline;gap:.9em;
  padding:15px 0;text-decoration:none;color:#fff;
  font-family:var(--font-display);font-weight:700;
  font-size:clamp(1.2rem,4.4vw,2.3rem);line-height:1.25;letter-spacing:.05em;
  transition:transform .3s ease,color .3s ease;
}
.veil-nav a::before{
  content:counter(vn,decimal-leading-zero);
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.14em;
  color:#ff5fae;flex:0 0 auto;
}
.veil-nav a:hover,.veil-nav a:focus-visible{transform:translateX(8px);color:#ffb6dc}

/* ---------- 首屏 ---------- */
.hero{
  display:flex;flex-direction:column;align-items:flex-start;gap:24px;
  min-height:calc(100vh - 118px);
  max-width:1400px;margin:0 auto;width:100%;
  padding:clamp(40px,9vh,108px) clamp(16px,4vw,44px) 64px;
  background:radial-gradient(120% 80% at 18% 0%,rgba(14,7,12,.62),transparent 72%);
}
.badge{
  display:inline-flex;align-items:center;gap:10px;margin:0;
  padding:9px 18px;border-radius:999px;
  border:1px solid rgba(255,0,255,.4);background:rgba(255,0,128,.12);
  font-family:var(--font-mono);font-size:.76rem;letter-spacing:.16em;
  color:#ffc2e2;max-width:100%;
  animation:float 7s ease-in-out infinite;
}
.badge .dot{width:7px;height:7px;border-radius:50%;background:var(--mag);box-shadow:0 0 14px 3px rgba(255,0,255,.7);flex:0 0 auto}
@keyframes float{50%{transform:translateY(-9px)}}
.hero h1{
  margin:0;max-width:16ch;
  font-family:var(--font-display);font-weight:700;
  font-size:clamp(2.3rem,10.4vw,6.5rem);line-height:1.05;letter-spacing:.035em;
  color:#fff;text-shadow:0 6px 44px rgba(0,0,0,.6),0 0 90px rgba(255,0,128,.35);
}
.hero h1::after{
  content:"";display:block;width:clamp(70px,22vw,220px);height:3px;margin-top:26px;
  background:linear-gradient(90deg,var(--pink),var(--mag),transparent);border-radius:3px;
}
.lede{
  margin:0;max-width:44ch;color:var(--muted);
  font-size:clamp(1rem,1.7vw,1.12rem);line-height:1.8;
}

/* ---------- 正文区 ---------- */
.stage{
  display:grid;grid-template-columns:222px minmax(0,1fr);
  gap:clamp(20px,3vw,42px);align-items:start;
  max-width:1400px;margin:0 auto;
  padding:0 clamp(16px,4vw,44px) 90px;
}
.rail{
  position:sticky;top:126px;
  padding:18px 16px 20px;border-radius:18px;
  border:1px solid var(--line);background:var(--card);
  backdrop-filter:blur(10px);
  box-shadow:0 20px 50px -30px rgba(255,0,128,.6);
}
.rail h2{
  margin:0 0 10px;font-family:var(--font-display);font-weight:700;
  font-size:.82rem;letter-spacing:.3em;color:#fff;
}
.rail hr{width:42px;height:2px;margin:0 0 6px;border:0;border-radius:2px;background:linear-gradient(90deg,var(--pink),transparent)}
.rail ol{list-style:none;margin:8px 0 0;padding:0;counter-reset:rn}
.rail li{counter-increment:rn}
.rail a{
  position:relative;display:flex;align-items:center;min-height:40px;
  padding:4px 0 4px 2.1em;text-decoration:none;
  color:var(--muted);font-size:.92rem;line-height:1.45;
  transition:color .25s ease,padding-left .25s ease;
}
.rail a::before{
  position:absolute;left:0;content:counter(rn,decimal-leading-zero);
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.1em;color:#ff5fae;
}
.rail a:hover,.rail a:focus-visible{color:#fff;padding-left:2.4em}

.prose{min-width:0;display:flex;flex-direction:column;gap:clamp(18px,2.4vw,30px)}
.prose > div{
  scroll-margin-top:132px;
  padding:clamp(22px,3.6vw,46px);
  border-radius:18px;border:1px solid var(--line);
  background:var(--card);backdrop-filter:blur(9px);
  box-shadow:0 30px 70px -42px rgba(255,0,128,.8),0 0 0 1px rgba(255,255,255,.04) inset;
}
.prose > div > :last-child{margin-bottom:0}
.prose h2{
  margin:0 0 14px;font-family:var(--font-display);font-weight:700;
  font-size:clamp(1.24rem,3.1vw,1.9rem);line-height:1.32;letter-spacing:.035em;color:#fff;
}
.prose h2 + hr{
  height:2px;width:100%;margin:0 0 22px;border:0;border-radius:2px;
  background:linear-gradient(90deg,var(--pink),var(--mag) 42%,transparent 88%);
}
.prose h3{
  margin:1.5em 0 .6em;font-size:clamp(1.05rem,2.2vw,1.24rem);
  letter-spacing:.02em;color:#ffd7ec;
}
.prose p{margin:0 0 1em;color:#eddfe8}
.prose strong{color:#fff}
.prose ul,.prose ol{margin:0 0 1em;padding-left:1.3em}
.prose li{margin:.4em 0}
.prose a{text-decoration:underline;text-underline-offset:3px}
.prose blockquote{
  margin:0 0 1em;padding:2px 0 2px 18px;
  border-left:3px solid var(--pink);color:var(--muted);
}
.prose hr{height:1px;border:0;margin:1.6em 0;background:linear-gradient(90deg,rgba(255,0,255,.55),transparent)}
.prose code{font-family:var(--font-mono);font-size:.9em;background:rgba(255,0,255,.14);padding:1px 6px;border-radius:6px}

.reveal{transition:opacity .7s ease,transform .7s cubic-bezier(.2,.7,.2,1)}
.js .reveal{opacity:0;transform:translateY(22px)}
.js .reveal.in{opacity:1;transform:none}

/* ---------- 页脚 ---------- */
.foot{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:26px 40px;max-width:1400px;margin:0 auto;
  padding:clamp(28px,5vw,56px) clamp(16px,4vw,44px) 46px;
  border-top:1px solid var(--line);
}
.foot-brand a{
  display:inline-block;text-decoration:none;
  font-family:var(--font-display);font-weight:700;
  font-size:clamp(2.4rem,9.5vw,5.6rem);line-height:.94;letter-spacing:.05em;
  background:linear-gradient(100deg,#ff0080,#ff00ff 55%,#a98bff);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
  filter:drop-shadow(0 0 34px rgba(255,0,160,.45));
}
.foot-nav dl{display:flex;flex-wrap:wrap;align-items:center;gap:0 12px;margin:0}
.foot-nav dt{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.22em;color:#ff5fae;margin-right:4px}
.foot-nav dd{margin:0}
.foot-nav a{
  display:inline-flex;align-items:center;min-height:40px;padding:0 4px;
  color:var(--muted);text-decoration:none;font-size:.9rem;
  transition:color .25s ease;
}
.foot-nav a:hover,.foot-nav a:focus-visible{color:#fff}
.foot-copy p{margin:0 0 10px;font-family:var(--font-mono);font-size:.78rem;letter-spacing:.12em;color:var(--muted)}

.totop{
  position:fixed;right:16px;bottom:16px;z-index:35;
  min-height:44px;padding:0 18px;border-radius:999px;cursor:pointer;
  border:1px solid rgba(255,0,255,.34);background:rgba(20,11,17,.82);
  color:#fff;font:inherit;font-size:.8rem;letter-spacing:.16em;
  backdrop-filter:blur(8px);
  transition:background .25s ease,transform .25s ease;
}
.totop:hover{background:rgba(255,0,128,.4);transform:translateY(-2px)}

@media (max-width:900px){
  body::before{filter:blur(36px) saturate(1.2);opacity:.5}
  .stage{grid-template-columns:minmax(0,1fr);gap:22px}
  .rail{position:static;padding:14px 14px 10px}
  .rail h2{font-size:.76rem;margin-bottom:8px}
  .rail ol{display:flex;gap:14px;overflow-x:auto;padding-bottom:6px;scrollbar-width:thin}
  .rail li{flex:0 0 auto}
  .rail a{padding:8px 0 8px 2.1em;white-space:nowrap}
  .rail a:hover{padding-left:2.1em;color:#fff}
  .hero{min-height:calc(100vh - 130px)}
}
@media (max-width:560px){
  body{font-size:16px}
  .hero{padding-top:34px;min-height:calc(100vh - 128px)}
  .hero h1{font-size:clamp(2.1rem,10.8vw,3rem)}
  .foot{flex-direction:column;align-items:flex-start;gap:22px}
  .foot-copy p{margin:0}
  .veil-nav a{padding:13px 0}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{animation:none!important;transition:none!important}
  .js .reveal{opacity:1;transform:none}
}
</style>

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