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

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

:root{
  --ink:#000000;
  --panel:#121212;
  --panel-deep:#08080c;
  --line:#26262e;
  --line-soft:#1a1a21;
  --glow:#6c9bff;
  --glow-dim:rgba(108,155,255,.16);
  --gold:#e6c07b;
  --text:#e3e6ee;
  --dim:#98a0b0;
  --rail:238px;
  --r:18px;
  --mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --sans:"IBM Plex Sans","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  color-scheme:dark;
}

html{
  background:#000;
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  padding-left:var(--rail);
  min-height:100vh;
  font-family:var(--sans);
  font-size:17px;
  font-weight:300;
  line-height:1.75;
  color:var(--text);
  overflow-x:hidden;
  background:
    radial-gradient(1200px 620px at 78% -12%, rgba(108,155,255,.10), transparent 62%),
    radial-gradient(900px 520px at 0% 104%, rgba(108,155,255,.06), transparent 60%),
    #000;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  opacity:.55;
  background-image:repeating-linear-gradient(90deg, rgba(255,255,255,.05) 0 1px, transparent 1px 96px);
}

a{color:inherit}

:focus-visible{
  outline:2px solid var(--glow);
  outline-offset:2px;
}

/* 左侧固定竖排 */
.rail{
  position:fixed;
  top:0;
  bottom:0;
  left:0;
  z-index:40;
  width:var(--rail);
  display:flex;
  flex-direction:column;
  gap:34px;
  padding:34px 20px;
  border-right:1px solid var(--line-soft);
  background:linear-gradient(180deg, rgba(18,18,18,.92), rgba(0,0,0,.97));
}

.brand{
  display:flex;
  align-items:center;
  min-height:40px;
  font-family:var(--mono);
  font-size:17px;
  font-weight:600;
  line-height:1.4;
  letter-spacing:.04em;
  color:#fff;
  text-decoration:none;
  word-break:break-word;
  text-shadow:0 0 14px rgba(108,155,255,.5);
}

.rail nav{min-width:0}

.rail nav p{
  display:flex;
  flex-direction:column;
  gap:2px;
  margin:0;
}

.rail nav a{
  display:block;
  padding:10px 12px;
  font-family:var(--mono);
  font-size:16px;
  color:var(--dim);
  text-decoration:none;
  border-left:2px solid transparent;
  border-radius:0 10px 10px 0;
  animation:slideIn .5s backwards;
  transition:color .2s, background .2s, border-color .2s, transform .2s;
}

.rail nav a:nth-child(1){animation-delay:.04s}
.rail nav a:nth-child(2){animation-delay:.08s}
.rail nav a:nth-child(3){animation-delay:.12s}
.rail nav a:nth-child(4){animation-delay:.16s}
.rail nav a:nth-child(5){animation-delay:.2s}
.rail nav a:nth-child(6){animation-delay:.24s}
.rail nav a:nth-child(7){animation-delay:.28s}

.rail nav a:hover,
.rail nav a:focus-visible{
  color:#fff;
  border-left-color:var(--glow);
  background:linear-gradient(90deg, var(--glow-dim), transparent);
  transform:translateX(2px);
  text-shadow:0 0 10px rgba(108,155,255,.45);
}

.rail nav a.is-on{
  color:#fff;
  border-left-color:var(--gold);
}

/* 主视觉 */
.hero{
  position:relative;
  z-index:1;
  isolation:isolate;
  display:grid;
  place-items:center;
  min-height:45vh;
  padding:64px 28px 78px;
  overflow:hidden;
  border-bottom:1px solid var(--line-soft);
}

.hero-art{
  position:absolute;
  inset:-8% -2%;
  z-index:-1;
  will-change:transform;
}

.hero-art img{
  position:absolute;
  width:38%;
  max-width:430px;
  height:76%;
  object-fit:cover;
  border:1px solid #22222a;
  border-radius:14px;
  opacity:.42;
  filter:grayscale(1) contrast(1.15) brightness(.72);
  box-shadow:0 26px 64px rgba(0,0,0,.72);
}

.hero-art img:first-child{
  left:3%;
  top:4%;
  transform:rotate(-3.2deg);
}

.hero-art img:last-child{
  right:3%;
  bottom:2%;
  transform:rotate(3.2deg);
}

.hero-copy{position:relative;z-index:2}

.hero-copy h1{
  max-width:24ch;
  margin:0;
  font-family:var(--mono);
  font-size:clamp(26px,4.2vw,52px);
  font-weight:600;
  line-height:1.26;
  letter-spacing:-.01em;
  text-align:center;
  color:#fff;
  text-shadow:0 0 22px rgba(108,155,255,.55), 0 0 64px rgba(108,155,255,.22);
}

.hero-band{
  position:absolute;
  left:-8%;
  right:-8%;
  bottom:0;
  height:20px;
  transform:skewY(-1.4deg);
  transform-origin:bottom left;
  opacity:.55;
  background:linear-gradient(90deg, #0c1a38, var(--glow) 58%, rgba(108,155,255,0) 100%);
  box-shadow:0 0 26px rgba(108,155,255,.35);
}

/* 内容区：aside 在左 */
.wrap{
  position:relative;
  z-index:1;
  display:grid;
  grid-template-columns:258px minmax(0,1fr);
  align-items:start;
  gap:44px;
  max-width:1180px;
  margin:0 auto;
  padding:52px 28px 74px;
}

.side{
  position:sticky;
  top:34px;
  padding:20px 18px;
  border:1px solid var(--line);
  border-radius:var(--r);
  background:linear-gradient(180deg, #101018, var(--panel-deep));
  box-shadow:0 18px 52px rgba(0,0,0,.66), inset 0 1px 0 rgba(255,255,255,.04);
}

.side h2{
  margin:0;
  font-family:var(--mono);
  font-size:16px;
  font-weight:500;
  letter-spacing:.22em;
  color:#cfd6e6;
}

.side hr{
  height:1px;
  margin:12px 0 14px;
  border:0;
  background:linear-gradient(90deg, var(--glow), var(--line) 44%, transparent);
}

.side ul{
  display:grid;
  gap:2px;
  margin:0;
  padding:0;
  list-style:none;
}

.side li{animation:fadeUp .5s backwards}
.side li:nth-child(1){animation-delay:.05s}
.side li:nth-child(2){animation-delay:.1s}
.side li:nth-child(3){animation-delay:.15s}
.side li:nth-child(4){animation-delay:.2s}
.side li:nth-child(5){animation-delay:.25s}
.side li:nth-child(6){animation-delay:.3s}
.side li:nth-child(7){animation-delay:.35s}

.side a{
  display:block;
  padding:10px;
  font-size:16px;
  color:var(--dim);
  text-decoration:none;
  border-bottom:1px solid var(--line-soft);
  border-radius:10px;
  transition:color .2s, background .2s, padding-left .2s;
}

.side li:last-child a{border-bottom:0}

.side a:hover,
.side a:focus-visible,
.side a.is-on{
  color:#fff;
  padding-left:16px;
  background:rgba(108,155,255,.09);
}

.body{min-width:0}

article{
  max-width:72ch;
  font-size:17px;
  line-height:1.85;
  color:#dcdfe8;
}

main section[id]{
  margin:0 0 22px;
  padding:30px 28px;
  scroll-margin-top:96px;
  border:1px solid var(--line);
  border-radius:var(--r);
  background:var(--panel);
  box-shadow:0 20px 52px rgba(0,0,0,.55);
}

article h2,
article h3{
  font-family:var(--mono);
  color:#fff;
  line-height:1.36;
}

article h2{
  margin:0 0 2px;
  padding-left:16px;
  font-size:clamp(21px,2.3vw,28px);
  border-left:3px solid var(--glow);
  text-shadow:0 0 16px rgba(108,155,255,.35);
}

article h3{
  margin:26px 0 6px;
  font-size:19px;
  color:#eef1f8;
}

article hr{
  height:1px;
  margin:14px 0 18px;
  border:0;
  background:linear-gradient(90deg, rgba(108,155,255,.55), rgba(108,155,255,.08) 46%, transparent);
}

article p{margin:0 0 16px}
article ul,
article ol{margin:0 0 18px;padding-left:22px}
article li{margin:6px 0}
article strong{color:#fff;font-weight:600}
article em{color:#cfd8ea}

article a{
  color:#a8c2ff;
  text-decoration:underline;
  text-decoration-color:rgba(168,194,255,.42);
  text-underline-offset:3px;
}

article a:hover{color:#fff}

article blockquote{
  margin:0 0 18px;
  padding:14px 18px;
  color:#d8dbe4;
  border-left:2px solid var(--gold);
  border-radius:0 12px 12px 0;
  background:rgba(230,192,123,.05);
}

article img{
  max-width:100%;
  height:auto;
  border-radius:12px;
}

article table{
  width:100%;
  border-collapse:collapse;
  font-size:16px;
}

article th,
article td{
  padding:10px 12px;
  text-align:left;
  border-bottom:1px solid var(--line);
}

article th{color:#fff;font-weight:500}

article code{
  font-family:var(--mono);
  font-size:16px;
  padding:1px 6px;
  border-radius:6px;
  background:#1b1b22;
  color:#d9e4ff;
}

article pre{
  overflow-x:auto;
  padding:16px 18px;
  border:1px solid var(--line);
  border-radius:12px;
  background:#0d0d12;
}

article pre code{padding:0;background:none}

/* 页脚 */
.foot{
  position:relative;
  z-index:1;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:center;
  gap:10px 22px;
  padding:30px 24px 34px;
  border-top:1px solid var(--line-soft);
  background:#05050a;
  color:var(--dim);
  font-size:16px;
}

.foot address{
  font-style:normal;
  font-family:var(--mono);
  letter-spacing:.06em;
  color:#c8cede;
}

.foot ul{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  margin:0;
  padding:0;
  list-style:none;
}

.foot a{
  display:inline-block;
  padding:10px;
  color:var(--dim);
  text-decoration:none;
  border-radius:8px;
  transition:color .2s, background .2s;
}

.foot a:hover,
.foot a:focus-visible{
  color:#fff;
  background:rgba(108,155,255,.1);
}

.copy{
  flex:0 0 100%;
  margin:6px 0 0;
  text-align:center;
  font-size:16px;
  color:#6f7688;
}

@keyframes fadeUp{
  from{opacity:0;transform:translateY(8px)}
  to{opacity:1;transform:none}
}

@keyframes slideIn{
  from{opacity:0;transform:translateX(-8px)}
  to{opacity:1;transform:none}
}

@media (max-width:980px){
  body{padding-left:0}

  .rail{
    position:sticky;
    top:0;
    bottom:auto;
    width:auto;
    height:auto;
    flex-direction:row;
    flex-wrap:wrap;
    align-items:center;
    justify-content:space-between;
    gap:4px 10px;
    padding:8px 14px;
    border-right:0;
    border-bottom:1px solid var(--line);
    background:rgba(0,0,0,.93);
    backdrop-filter:blur(10px);
  }

  .brand{font-size:16px;min-height:40px}

  .rail nav{
    flex:1 1 100%;
    overflow-x:auto;
    scrollbar-width:none;
    -webkit-overflow-scrolling:touch;
  }

  .rail nav::-webkit-scrollbar{display:none}

  .rail nav p{flex-direction:row;gap:2px}

  .rail nav a{
    padding:10px 9px;
    white-space:nowrap;
    border-left:0;
    border-bottom:2px solid transparent;
    border-radius:8px;
  }

  .rail nav a:hover,
  .rail nav a:focus-visible{transform:none;background:transparent;border-bottom-color:var(--glow)}
  .rail nav a.is-on{border-bottom-color:var(--gold)}

  .hero{min-height:42vh;padding:44px 16px 62px}

  .hero-art img{width:44%;height:74%;opacity:.3}

  .wrap{
    grid-template-columns:1fr;
    gap:24px;
    padding:26px 16px 46px;
  }

  .side{position:static}

  main section[id]{
    padding:22px 18px;
    border-radius:14px;
    scroll-margin-top:112px;
  }

  article{max-width:none}

  .foot{padding:24px 16px 28px}
}

@media (max-width:560px){
  .hero-art img{width:50%;height:70%}
  .hero-copy h1{font-size:clamp(24px,7vw,32px)}
}

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

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