@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500&family=Playfair+Display:ital,wght@0,400;0,700;0,900;1,400&family=Source+Serif+4:ital,wght@0,300;0,400;0,600;1,300&display=swap');

:root{
  --ink:#0d0d0d;
  --violet:#8000ff;
  --magenta:#ff00ff;
  --paper:#ece7f7;
  --dim:#a89cc4;
  --line:rgba(128,0,255,.30);
  --card:rgba(18,12,27,.74);
  --bar:66px;
  --mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --serif:'Source Serif 4','Songti SC','Noto Serif CJK SC',Georgia,serif;
  --disp:'Playfair Display','Songti SC','Noto Serif CJK SC',Georgia,serif;
}

*{box-sizing:border-box}

html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}

body{
  margin:0;
  padding:0 0 calc(var(--bar) + 34px);
  background:
    radial-gradient(120% 55% at 50% -8%, rgba(128,0,255,.24), transparent 62%),
    radial-gradient(90% 55% at 106% 94%, rgba(255,0,255,.14), transparent 60%),
    var(--ink);
  color:var(--paper);
  font-family:var(--serif);
  font-size:17px;
  line-height:1.78;
  overflow-x:hidden;
}

body::after{
  content:'';
  position:fixed;
  inset:0;
  z-index:70;
  pointer-events:none;
  background:repeating-linear-gradient(180deg, rgba(255,255,255,.035) 0 1px, transparent 1px 3px);
  opacity:.65;
}

::selection{background:var(--magenta);color:#0d0d0d}

img{max-width:100%;height:auto;display:block}

h1,h2,h3{font-family:var(--disp);line-height:1.24;margin:0;font-weight:700}

a{color:#e3d3ff}

/* ---------- 底部固定条 ---------- */
.bar{
  position:fixed;
  left:0;right:0;bottom:0;
  z-index:50;
  display:grid;
  grid-template-columns:56px 1fr 56px;
  align-items:center;
  min-height:var(--bar);
  background:rgba(11,9,15,.94);
  border-top:1px solid rgba(255,0,255,.38);
  box-shadow:0 -22px 46px -32px rgba(255,0,255,.95);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
}

.tog{position:absolute;opacity:0;width:1px;height:1px;margin:0}

.burger{
  grid-column:1;
  position:relative;
  z-index:3;
  display:flex;
  align-items:center;
  justify-content:center;
  min-height:var(--bar);
  font-family:var(--mono);
  font-size:1rem;
  letter-spacing:.12em;
  color:var(--magenta);
  text-shadow:0 0 10px rgba(255,0,255,.75);
  cursor:pointer;
  -webkit-user-select:none;
  user-select:none;
}
.burger .t-on{display:none}
.tog:checked ~ .burger .t-on{display:inline}
.tog:checked ~ .burger .t-off{display:none}
.tog:focus-visible ~ .burger{outline:2px solid var(--magenta);outline-offset:-8px;border-radius:14px}

.brand{
  grid-column:2;
  position:relative;
  z-index:2;
  justify-self:center;
  padding:12px 8px;
  font-family:var(--disp);
  font-weight:900;
  font-size:1.06rem;
  letter-spacing:.05em;
  text-align:center;
  text-decoration:none;
  color:#fff;
  text-shadow:0 0 12px rgba(255,0,255,.8),0 0 26px rgba(128,0,255,.7);
}

.menu{
  position:fixed;
  inset:0;
  z-index:1;
  margin:0;
  padding:76px 20px calc(var(--bar) + 28px);
  list-style:none;
  display:flex;
  flex-direction:column;
  justify-content:center;
  align-items:center;
  gap:2px;
  overflow-y:auto;
  background:rgba(8,6,12,.975);
  opacity:0;
  visibility:hidden;
  transform:translateY(12px);
  transition:opacity .26s ease, transform .26s ease, visibility .26s ease;
}
.tog:checked ~ .menu{opacity:1;visibility:visible;transform:none}

.menu li{width:100%;max-width:330px}

.menu a{
  display:flex;
  align-items:center;
  justify-content:center;
  min-height:52px;
  padding:14px 8px;
  font-family:var(--disp);
  font-size:1.18rem;
  text-align:center;
  text-decoration:none;
  color:#f3ecff;
  border-bottom:1px solid rgba(128,0,255,.28);
}
.menu a:active{color:var(--magenta);text-shadow:0 0 12px var(--magenta)}

/* ---------- 版面 ---------- */
.wrap{max-width:1140px;margin:0 auto;padding:0 18px}

.hero{
  position:relative;
  display:grid;
  place-items:center;
  min-height:45vh;
  padding:clamp(30px,9vh,64px) 0;
  border-bottom:1px solid var(--line);
  text-align:center;
  overflow:hidden;
}
.hero::before{
  content:'';
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(rgba(128,0,255,.17) 1px, transparent 1px),
    linear-gradient(90deg, rgba(128,0,255,.17) 1px, transparent 1px);
  background-size:36px 36px;
  -webkit-mask-image:radial-gradient(72% 66% at 50% 46%, #000 18%, transparent 80%);
  mask-image:radial-gradient(72% 66% at 50% 46%, #000 18%, transparent 80%);
  pointer-events:none;
}

.hero-in{
  position:relative;
  z-index:1;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:16px;
}

.mark{
  width:44px;height:44px;
  fill:none;
  stroke:var(--magenta);
  stroke-width:2;
  stroke-linejoin:round;
  filter:drop-shadow(0 0 10px rgba(255,0,255,.85));
}
.mark path{fill:rgba(255,0,255,.16)}

.hero h1{
  max-width:22ch;
  font-size:clamp(1.62rem,6.4vw,3rem);
  letter-spacing:.01em;
  color:#fff;
  text-shadow:0 0 16px rgba(255,0,255,.5),0 0 44px rgba(128,0,255,.55);
}

.glitch{position:relative}
.glitch::before,
.glitch::after{
  content:attr(data-text);
  position:absolute;
  left:0;top:0;
  width:100%;
  pointer-events:none;
}
.glitch::before{
  color:var(--magenta);
  clip-path:inset(0 0 58% 0);
  transform:translate(-2px,-2px);
  opacity:.85;
}
.glitch::after{
  color:#b56bff;
  clip-path:inset(56% 0 0 0);
  transform:translate(2px,2px);
  opacity:.8;
}

/* ---------- 主内容 ---------- */
.deck{display:grid;gap:22px;padding:26px 0}

.rail{
  order:0;
  padding:18px;
  border:1px solid var(--line);
  border-radius:28px;
  background:var(--card);
  box-shadow:0 26px 50px -34px rgba(128,0,255,.9);
}

.rail h2{font-size:1.22rem;color:#fff;margin-bottom:4px}

.rail-list{list-style:none;margin:8px 0 0;padding:0}
.rail-list a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:8px 4px;
  font-family:var(--mono);
  font-size:1rem;
  text-decoration:none;
  color:#cfc2e6;
  border-bottom:1px dashed rgba(128,0,255,.26);
}
.rail-list li:last-child a{border-bottom:0}
.rail-list a:hover{color:#fff;text-shadow:0 0 10px var(--magenta)}

.prose{min-width:0;counter-reset:sec}

.prose > div{
  counter-increment:sec;
  padding:clamp(20px,4.4vw,36px);
  margin:0 0 22px;
  border:1px solid var(--line);
  border-radius:28px;
  background:var(--card);
  box-shadow:0 30px 60px -40px rgba(128,0,255,.95), inset 0 0 0 1px rgba(255,0,255,.06);
  scroll-margin-block:calc(var(--bar) + 24px);
}
.prose > div:last-child{margin-bottom:0}

.prose > div::before{
  content:counter(sec, decimal-leading-zero);
  display:block;
  margin-bottom:10px;
  font-family:var(--mono);
  font-size:1rem;
  letter-spacing:.24em;
  color:var(--magenta);
  text-shadow:0 0 12px rgba(255,0,255,.8);
}

.prose > div:target{
  border-color:rgba(255,0,255,.72);
  box-shadow:0 30px 60px -34px rgba(255,0,255,.9), inset 0 0 0 1px rgba(255,0,255,.24);
}

.prose h2{
  font-size:clamp(1.36rem,4vw,1.92rem);
  color:#fff;
  margin:.05em 0 .5em;
  text-shadow:0 0 16px rgba(128,0,255,.7);
}
.prose h3{
  font-size:1.16rem;
  color:#f4edff;
  margin:1.4em 0 .4em;
  text-shadow:0 0 12px rgba(255,0,255,.45);
}

.prose p{margin:.72em 0;max-width:66ch}
.prose > div > *:first-child{margin-top:0}
.prose ul,.prose ol{padding-left:1.35em;margin:.7em 0}
.prose li{margin:.36em 0}

.prose a{
  color:#e0c0ff;
  text-decoration:underline;
  text-decoration-color:rgba(255,0,255,.6);
  text-underline-offset:3px;
}
.prose a:hover{color:#fff;text-decoration-color:var(--magenta)}

.prose blockquote{
  margin:1.1em 0;
  padding:.4em 0 .4em 16px;
  border-left:2px solid var(--magenta);
  color:#d9cef0;
  font-style:italic;
}

.prose img{border:1px solid var(--line);border-radius:18px;margin:1em 0}

.prose figure{margin:1.1em 0}
.prose figcaption{font-family:var(--mono);font-size:1rem;color:var(--dim);margin-top:6px}

.prose table{display:block;width:100%;overflow-x:auto;border-collapse:collapse;font-size:1rem}
.prose th,.prose td{padding:10px 12px;border:1px solid var(--line);text-align:left}
.prose th{font-family:var(--mono);color:var(--magenta);background:rgba(128,0,255,.12)}

.prose code,.prose pre{
  font-family:var(--mono);
  font-size:1rem;
  background:rgba(128,0,255,.14);
  border-radius:10px;
}
.prose code{padding:1px 6px}
.prose pre{padding:14px;overflow-x:auto;border:1px solid var(--line)}

.prose hr{border:0;border-top:1px dashed var(--line);margin:1.4em 0}

small{
  display:block;
  margin-bottom:6px;
  font-family:var(--mono);
  font-size:1rem;
  letter-spacing:.22em;
  color:var(--magenta);
  text-shadow:0 0 10px rgba(255,0,255,.7);
}

/* ---------- 页脚 ---------- */
.foot{
  display:grid;
  gap:22px 26px;
  margin-top:36px;
  padding:32px 18px calc(var(--bar) + 30px);
  border-top:1px solid var(--line);
  background:linear-gradient(180deg, rgba(128,0,255,.12), transparent 74%);
}
.foot div{min-width:0}
.foot h2{font-size:1.24rem;color:#fff;margin-bottom:6px}
.foot p{margin:.4em 0 0}

.host{
  font-family:var(--mono);
  font-size:1rem;
  color:var(--dim);
  word-break:break-all;
}

.f-list{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-wrap:wrap;
  gap:0 16px;
}
.f-list a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:8px 0;
  font-family:var(--mono);
  font-size:1rem;
  text-decoration:none;
  color:#cfc2e6;
}
.f-list a:hover{color:#fff;text-shadow:0 0 10px var(--magenta)}

.sub{display:flex;flex-wrap:wrap;gap:10px;margin-top:10px}
.sub input{
  flex:1 1 170px;
  min-height:46px;
  padding:12px 14px;
  font-family:var(--mono);
  font-size:1rem;
  color:var(--paper);
  background:#120c1a;
  border:1px solid var(--line);
  border-radius:14px;
}
.sub input::placeholder{color:var(--dim)}
.sub input:focus{outline:2px solid rgba(255,0,255,.7);outline-offset:1px}
.sub button{
  min-height:46px;
  padding:12px 22px;
  font-family:var(--mono);
  font-size:1rem;
  letter-spacing:.08em;
  color:#fff;
  background:linear-gradient(135deg,var(--violet),var(--magenta));
  border:0;
  border-radius:14px;
  cursor:pointer;
  box-shadow:0 0 22px -4px rgba(255,0,255,.8);
}
.sub button:hover{filter:brightness(1.14)}

.copy{
  grid-column:1 / -1;
  margin:6px 0 0;
  padding-top:14px;
  border-top:1px dashed rgba(128,0,255,.3);
  font-family:var(--mono);
  font-size:1rem;
  color:var(--dim);
  text-align:center;
}

/* ---------- 动效 ---------- */
@media (prefers-reduced-motion: no-preference){
  .glitch::before{animation:gA 5.4s steps(2,end) infinite}
  .glitch::after{animation:gB 6.2s steps(2,end) infinite}
  @keyframes gA{
    0%,88%,100%{transform:translate(-2px,-2px)}
    90%{transform:translate(3px,-1px)}
    94%{transform:translate(-4px,1px)}
  }
  @keyframes gB{
    0%,84%,100%{transform:translate(2px,2px)}
    86%{transform:translate(-3px,2px)}
    92%{transform:translate(4px,-2px)}
  }

  html.js .reveal{opacity:0;transform:translateY(18px)}
  html.js .reveal.in{
    opacity:1;
    transform:none;
    transition:opacity .62s ease, transform .62s cubic-bezier(.18,.72,.28,1);
  }
}

/* ---------- 大屏 ---------- */
@media (min-width:900px){
  .bar{grid-template-columns:56px repeat(3,1fr) minmax(150px,auto) repeat(4,1fr)}
  .brand{grid-column:5}
  .menu{
    position:static;
    display:contents;
    padding:0;
    background:none;
    overflow:visible;
  }
  .menu li{width:auto;max-width:none}
  .menu a{
    min-height:46px;
    padding:8px 6px;
    font-family:var(--mono);
    font-size:1rem;
    letter-spacing:.02em;
    color:#c9bce2;
    border-bottom:0;
  }
  .menu a:hover{color:#fff;text-shadow:0 0 10px var(--magenta)}
  .tog:checked ~ .menu{
    display:flex;
    position:fixed;
    inset:0;
    padding:80px 20px calc(var(--bar) + 30px);
    overflow-y:auto;
    background:rgba(8,6,12,.985);
    border-bottom:1px solid var(--magenta);
  }
  .tog:checked ~ .menu li{width:100%;max-width:360px}
  .tog:checked ~ .menu a{
    justify-content:center;
    font-family:var(--disp);
    font-size:1.22rem;
    padding:16px 8px;
    color:#f3ecff;
    border-bottom:1px solid rgba(128,0,255,.28);
  }

  .hero-in{flex-direction:row;gap:24px;align-items:center}
  .hero h1{max-width:24ch;text-align:left}
  .hero{text-align:left;place-items:center;min-height:46vh}

  .deck{grid-template-columns:232px minmax(0,1fr);gap:26px;align-items:start}
  .rail{position:sticky;top:22px}

  .foot{grid-template-columns:1.15fr 1fr;max-width:1140px;margin:44px auto 0;padding:38px 18px calc(var(--bar) + 34px)}
  .f-three,.copy{grid-column:1 / -1}
}

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