@import url('https://fonts.googleapis.com/css2?family=Fira+Code:wght@400;500;600;700&family=Fira+Sans:wght@300;400;500;600;700&display=swap');

:root{
  --ink:#0d0d0d;
  --ink2:#120f18;
  --ink3:#1a1422;
  --purple:#8000ff;
  --magenta:#ff00ff;
  --txt:#e9e4f4;
  --dim:#a99cc4;
  --line:#2c1f40;
  --mono:"Fira Code",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --sans:"Fira Sans",system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",sans-serif;
  --max:1180px;
  --glow-m:0 0 12px rgba(255,0,255,.55);
  --glow-p:0 0 12px rgba(128,0,255,.7);
  --r:10px;
}

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

html{
  scroll-behavior:smooth;
  scroll-padding-top:150px;
  -webkit-text-size-adjust:100%;
  overflow-x:hidden;
}

body{
  margin:0;
  background:var(--ink);
  color:var(--txt);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.78;
  overflow-x:hidden;
  width:100%;
  background-image:
    radial-gradient(920px 520px at 92% -12%,rgba(128,0,255,.24),transparent 62%),
    radial-gradient(680px 460px at -5% 8%,rgba(255,0,255,.13),transparent 58%),
    linear-gradient(180deg,#0d0d0d,#0b0a10 62%,#0d0d0d);
  background-attachment:fixed;
}

body::after{
  content:"";
  position:fixed;
  inset:0;
  z-index:60;
  pointer-events:none;
  opacity:.42;
  mix-blend-mode:screen;
  background:repeating-linear-gradient(180deg,rgba(255,255,255,.05) 0 1px,transparent 1px 4px);
}

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

a{color:#d8c7ff;text-decoration:none;transition:color .16s ease,box-shadow .16s ease,border-color .16s ease,background-color .16s ease}

a:focus-visible,button:focus-visible,input:focus-visible{
  outline:2px solid var(--magenta);
  outline-offset:2px;
}

.skip{
  position:absolute;
  left:-9999px;
  top:0;
  z-index:80;
  padding:12px 18px;
  background:var(--magenta);
  color:#0d0d0d;
  font-family:var(--mono);
  font-weight:600;
  border-radius:0 0 var(--r) 0;
}
.skip:focus{left:0}

/* ---------- 顶部：品牌行 + 菜单行 ---------- */

.top{
  position:sticky;
  top:0;
  z-index:50;
  background:rgba(13,13,13,.95);
  backdrop-filter:blur(9px);
  border-bottom:1px solid var(--line);
  transition:box-shadow .2s ease;
}
.top::after{
  content:"";
  display:block;
  height:2px;
  background:linear-gradient(90deg,var(--purple),var(--magenta) 46%,rgba(255,0,255,0));
}
.top--stuck{box-shadow:0 14px 34px -18px rgba(255,0,255,.6)}

.top__bar{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  max-width:var(--max);
  margin:0 auto;
  padding:14px 20px 12px;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:11px;
  min-height:44px;
  min-width:0;
  color:#fff;
  font-family:var(--mono);
  font-weight:700;
  font-size:19px;
  letter-spacing:.2em;
}

.brand__mark{
  flex:0 0 auto;
  width:14px;
  height:14px;
  background:linear-gradient(135deg,var(--magenta),var(--purple));
  box-shadow:var(--glow-m);
  transform:rotate(45deg);
  animation:pulse 3.4s ease-in-out infinite;
}
img.brand__mark{transform:none;width:20px;height:20px;background:none;box-shadow:none}

.brand__txt{position:relative;overflow-wrap:anywhere}

.brand:hover .brand__txt{
  text-shadow:0 0 10px rgba(255,0,255,.7);
  animation:glitch .42s steps(2,end) 2;
}

.read{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--magenta);
  border:1px solid rgba(255,0,255,.55);
  border-radius:var(--r);
  padding:4px 9px;
  white-space:nowrap;
  text-shadow:var(--glow-m);
}

.nav{
  border-top:1px dashed rgba(128,0,255,.34);
  background:linear-gradient(90deg,rgba(128,0,255,.16),rgba(255,0,255,.05));
  max-width:100%;
}

.nav__list{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  max-width:var(--max);
  margin:0 auto;
  padding:8px 20px 12px;
  list-style:none;
  counter-reset:n;
  max-width:100%;
}
.nav__list li{display:block}

.nav__list a{
  display:flex;
  align-items:center;
  gap:7px;
  min-height:44px;
  padding:8px 12px;
  font-family:var(--mono);
  font-size:16px;
  color:var(--dim);
  background:rgba(13,13,13,.7);
  border:1px solid var(--line);
  border-radius:var(--r);
  transform:skewX(-7deg);
}
.nav__list a > span{display:inline-block;transform:skewX(7deg)}
.nav__list a:hover,
.nav__list a:focus-visible{
  color:#fff;
  border-color:var(--magenta);
  background:rgba(255,0,255,.12);
  box-shadow:inset 0 0 16px rgba(255,0,255,.25),var(--glow-m);
  transform:skewX(-7deg) translateY(-2px);
}
.nav__list a:hover .lbl{text-shadow:var(--glow-p)}

.idx{
  font-size:11px;
  letter-spacing:.1em;
  color:var(--magenta);
  opacity:.85;
}

/* ---------- Hero ---------- */

.hero{
  position:relative;
  display:grid;
  grid-template-rows:auto 1fr;
  gap:20px;
  min-height:70vh;
  max-width:var(--max);
  margin:0 auto;
  padding:38px 20px 0;
  overflow:hidden;
}

.hero__txt{
  padding-left:4%;
  text-align:right;
  min-width:0;
}

.hero__h1{
  margin:0;
  font-family:var(--mono);
  font-size:clamp(1.8rem,6vw,3.5rem);
  line-height:1.26;
  letter-spacing:.01em;
  color:#fff;
  text-shadow:0 0 18px rgba(255,0,255,.5),0 0 48px rgba(128,0,255,.45);
  overflow-wrap:break-word;
}

.hero__sub{
  max-width:56ch;
  margin:14px 0 0 auto;
  color:var(--dim);
  font-size:16px;
  line-height:1.72;
}

.hero__media{
  position:relative;
  min-height:32vh;
  overflow:hidden;
  border:1px solid var(--line);
  border-bottom:0;
  border-radius:var(--r) var(--r) 0 0;
  background:
    linear-gradient(180deg,rgba(128,0,255,.16),rgba(13,13,13,.92) 72%),
    repeating-linear-gradient(90deg,rgba(255,0,255,.1) 0 1px,transparent 1px 46px),
    repeating-linear-gradient(0deg,rgba(128,0,255,.1) 0 1px,transparent 1px 46px);
}

.hero__img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(.86) contrast(1.12) brightness(.92);
  transform-origin:50% 20%;
}

.hero__band{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:12px;
  background:linear-gradient(90deg,var(--magenta),var(--purple) 58%,rgba(128,0,255,0));
  transform:skewY(-2.6deg);
  transform-origin:0 100%;
  box-shadow:0 0 26px rgba(255,0,255,.45);
}

/* ---------- 主体：左目录 + 右正文 ---------- */

.wrap{
  display:grid;
  grid-template-columns:232px minmax(0,1fr);
  align-items:start;
  gap:34px;
  max-width:var(--max);
  margin:0 auto;
  padding:46px 20px 66px;
}
.wrap > *{min-width:0}

.side{
  position:sticky;
  top:134px;
  min-width:0;
  padding:13px 12px 15px;
  border:1px solid var(--line);
  border-left:3px solid var(--magenta);
  border-radius:var(--r);
  background:linear-gradient(180deg,rgba(128,0,255,.14),rgba(13,13,13,.92));
  overflow:hidden;
}

.side__h{
  margin:0 0 8px;
  font-family:var(--mono);
  font-size:13px;
  font-weight:600;
  letter-spacing:.28em;
  color:var(--magenta);
  text-shadow:var(--glow-m);
}
.side__h span{display:inline-block}

.side__list{
  display:grid;
  gap:3px;
  margin:0;
  padding:0;
  list-style:none;
}
.side__list a{
  display:flex;
  align-items:center;
  gap:8px;
  min-height:42px;
  padding:5px 8px;
  font-family:var(--mono);
  font-size:16px;
  color:var(--dim);
  border-left:2px solid transparent;
  border-radius:0 var(--r) var(--r) 0;
  overflow-wrap:anywhere;
}
.side__list a:hover,
.side__list a:focus-visible{
  color:#fff;
  background:rgba(255,0,255,.13);
  border-left-color:var(--magenta);
}

.panel{min-width:0}

.prose{overflow-wrap:break-word;word-break:break-word}

.prose > div{
  scroll-margin-top:154px;
  padding:28px 0 34px;
  border-top:1px solid rgba(128,0,255,.26);
}
.prose > div:first-child{border-top:0;padding-top:0}

.prose h2{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:10px;
  margin:0 0 16px;
  font-family:var(--mono);
  font-size:clamp(1.28rem,3.1vw,1.82rem);
  line-height:1.42;
  color:#fff;
  text-shadow:0 0 14px rgba(128,0,255,.6);
  overflow-wrap:anywhere;
}
.prose h2::before{
  content:"";
  flex:0 0 auto;
  width:9px;
  height:18px;
  background:linear-gradient(180deg,var(--magenta),var(--purple));
  transform:skewY(-12deg);
  box-shadow:var(--glow-m);
}
.prose h2 span{position:relative;display:inline-block;padding-bottom:7px}
.prose h2 span::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:3px;
  background:linear-gradient(90deg,var(--magenta),var(--purple));
  transform:skewY(-6deg);
}

.prose h3{
  display:flex;
  align-items:baseline;
  gap:8px;
  margin:26px 0 10px;
  font-family:var(--mono);
  font-size:1.14rem;
  line-height:1.5;
  color:#fff;
  overflow-wrap:anywhere;
}
.prose h3::before{
  content:"▚";
  flex:0 0 auto;
  color:var(--magenta);
  font-size:.9em;
}
.prose h3 span{display:inline-block}

.prose p{margin:0 0 16px}

.prose a{border-bottom:1px dashed rgba(255,0,255,.6)}
.prose a:hover{color:#fff;border-bottom-style:solid}

.prose strong{color:#fff;font-weight:600}

.prose ul,.prose ol{margin:0 0 18px;padding-left:22px}
.prose li{margin:7px 0}
.prose ul li::marker{color:var(--magenta)}
.prose ol li::marker{color:var(--magenta);font-family:var(--mono)}

.prose code{
  padding:2px 6px;
  font-family:var(--mono);
  font-size:.95em;
  color:#ffc4ff;
  background:var(--ink3);
  border-radius:6px;
  overflow-wrap:anywhere;
}

.prose blockquote{
  margin:20px 0;
  padding:12px 18px;
  border-left:3px solid var(--purple);
  background:rgba(128,0,255,.1);
  color:#efe8fb;
}
.prose blockquote p:last-child{margin:0}

.prose table{
  width:100%;
  max-width:100%;
  margin:20px 0;
  border-collapse:collapse;
  font-family:var(--mono);
  font-size:16px;
  line-height:1.55;
}
.prose th,.prose td{
  padding:10px 12px;
  text-align:left;
  border:1px solid var(--line);
}
.prose th{background:rgba(128,0,255,.22);color:#fff}
.prose tr:nth-child(even) td{background:rgba(255,0,255,.055)}

.prose hr{
  height:0;
  margin:26px 0;
  border:0;
  border-top:1px dashed rgba(255,0,255,.4);
}

.prose img{
  border-radius:var(--r);
  border:1px solid var(--line);
}

/* ---------- 页脚 ---------- */

.foot{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-start;
  justify-content:space-between;
  gap:26px;
  max-width:var(--max);
  margin:0 auto;
  padding:28px 20px 46px;
  border-top:1px solid var(--line);
  position:relative;
  overflow:hidden;
}
.foot > *{min-width:0}
.foot::before{
  content:"";
  position:absolute;
  top:-1px;
  left:0;
  width:46%;
  height:2px;
  background:linear-gradient(90deg,var(--magenta),var(--purple),transparent);
}

.sig{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  font-family:var(--mono);
  font-weight:700;
  font-size:17px;
  letter-spacing:.2em;
  color:#fff;
  text-shadow:0 0 10px rgba(128,0,255,.7);
}
.sig:hover{color:var(--magenta)}

.foot__nav{flex:1 1 300px;min-width:0}

.foot__list{
  display:flex;
  flex-wrap:wrap;
  gap:4px 12px;
  margin:0;
  padding:0;
  list-style:none;
  font-family:var(--mono);
  font-size:16px;
}
.foot__list .idx{display:none}
.foot__list a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:2px 2px;
  color:var(--dim);
  border-bottom:1px solid transparent;
}
.foot__list a:hover{color:#fff;border-bottom-color:var(--magenta)}

.foot__end{flex:0 1 300px;min-width:0}

.foot__h{
  margin:0 0 8px;
  font-family:var(--mono);
  font-size:13px;
  font-weight:600;
  letter-spacing:.26em;
  color:var(--magenta);
  text-shadow:var(--glow-m);
}
.foot__h span{display:inline-block}

.sub{display:flex;gap:8px;margin-bottom:10px;min-width:0}

.sub__in{
  flex:1 1 auto;
  min-width:0;
  min-height:44px;
  padding:8px 11px;
  font-family:var(--mono);
  font-size:16px;
  color:#fff;
  background:var(--ink2);
  border:1px solid var(--line);
  border-radius:var(--r);
}
.sub__in::placeholder{color:#8d80a6}

.sub__btn{
  flex:0 0 auto;
  min-height:44px;
  padding:8px 16px;
  font-family:var(--mono);
  font-size:16px;
  color:#0d0d0d;
  background:linear-gradient(135deg,var(--magenta),var(--purple));
  border:0;
  border-radius:var(--r);
  cursor:pointer;
  transition:box-shadow .16s ease,filter .16s ease;
}
.sub__btn:hover{filter:brightness(1.14);box-shadow:var(--glow-m)}

.foot__copy{
  margin:0;
  font-family:var(--mono);
  font-size:14px;
  color:#7f7398;
  letter-spacing:.04em;
  overflow-wrap:anywhere;
}

/* ---------- 动效 ---------- */

@keyframes pulse{
  0%,100%{box-shadow:0 0 6px rgba(255,0,255,.6)}
  50%{box-shadow:0 0 18px rgba(128,0,255,.9)}
}

@keyframes glitch{
  0%,100%{transform:translate(0,0) skewX(0)}
  25%{transform:translate(-1.5px,1px) skewX(-1.5deg)}
  55%{transform:translate(1.5px,-1px) skewX(1.5deg)}
  80%{transform:translate(-1px,0) skewX(-.6deg)}
}

/* ---------- 断点 ---------- */

@media (max-width:900px){
  .wrap{grid-template-columns:minmax(0,1fr);gap:24px;padding-top:28px}
  .side{position:static;order:-1;border-left:1px solid var(--line);border-top:3px solid var(--magenta)}
  .side__list{grid-template-columns:1fr 1fr}
  .hero__txt{padding-left:0}
  .foot{flex-direction:column;gap:18px}
  .foot__nav{flex:1 1 auto}
  .foot__end{flex:1 1 auto;width:100%}
}

@media (max-width:620px){
  body{font-size:16px}
  .top__bar{padding:11px 16px 9px}
  .brand{font-size:17px;letter-spacing:.12em}
  .read{font-size:11px;padding:3px 7px;letter-spacing:.1em}
  .nav__list{
    flex-wrap:nowrap;
    overflow-x:auto;
    overflow-y:hidden;
    padding:7px 16px 10px;
    scrollbar-width:none;
    -webkit-overflow-scrolling:touch;
  }
  .nav__list::-webkit-scrollbar{display:none}
  .nav__list a{font-size:16px;padding:8px 11px;white-space:nowrap}
  .hero{min-height:66vh;padding:24px 16px 0}
  .hero__txt{text-align:left}
  .hero__h1{font-size:clamp(1.7rem,7.4vw,2.4rem)}
  .hero__sub{margin-left:0}
  .hero__media{min-height:26vh}
  .wrap{padding:24px 16px 48px}
  .side__list{grid-template-columns:minmax(0,1fr)}
  .prose > div{padding:24px 0 28px}
  .prose table{display:block;overflow-x:auto;font-size:15px}
  .foot{padding:22px 16px 38px}
  .foot__list{font-size:16px}
  .sub{flex-wrap:wrap}
  .sub__in{flex:1 1 140px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
}

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