:root{
  --void:#0B0618;
  --night:#170C29;
  --neon:#A855F7;
  --volt:#2F7BFF;
  --cyan:#37F2D6;
  --amber:#FFB454;
  --rose:#FF4D8D;
  --ink:#F4F1FF;
  --mist:#A79BC9;
  --line:#2A1B45;

  --rail-w:232px;
  --bar-h:64px;
  --maxw:1180px;

  --gap-xs:8px;
  --gap-sm:16px;
  --gap-1:24px;
  --gap-2:48px;
  --gap-3:96px;

  --radius-sm:12px;
  --radius:18px;
  --radius-lg:28px;

  --font-sans:"PingFang SC","Hiragino Sans GB","Noto Sans SC","Source Han Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",ui-monospace,Menlo,Consolas,"Courier New",monospace;

  --ease:cubic-bezier(.22,1,.36,1);
}

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

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

body{
  margin:0;
  min-height:100vh;
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  background-color:var(--void);
  background-image:
    radial-gradient(120% 85% at 78% -10%,rgba(168,85,247,.30),transparent 60%),
    radial-gradient(95% 70% at 6% 14%,rgba(47,123,255,.22),transparent 62%),
    radial-gradient(80% 60% at 62% 104%,rgba(55,242,214,.12),transparent 62%);
  background-attachment:fixed;
  background-repeat:no-repeat;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:2;
  pointer-events:none;
  background-image:repeating-linear-gradient(to bottom,rgba(244,241,255,.032) 0 1px,transparent 1px 3px);
}

h1,h2,h3,h4,h5,p,figure,blockquote,ul,ol{margin:0}
ul[class],ol[class]{list-style:none;padding:0}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
strong{font-weight:800}

:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
  border-radius:6px;
}

.mono{font-family:var(--font-mono);letter-spacing:.02em;font-variant-numeric:tabular-nums}
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}
.tilt-l{transform:rotate(-1.6deg)}
.tilt-r{transform:rotate(1.6deg)}

/* ============ 头部 ============ */
.site-header{position:relative;z-index:100}

.skip-link{
  position:fixed;
  top:12px;
  left:12px;
  z-index:200;
  padding:11px 20px;
  border-radius:999px;
  background:var(--cyan);
  color:#04201C;
  font-size:14px;
  font-weight:800;
  transform:translateY(-180%);
  transition:transform .24s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

.brand-rail{
  position:fixed;
  top:0;
  left:0;
  bottom:0;
  width:var(--rail-w);
  z-index:110;
  display:flex;
  flex-direction:column;
  gap:24px;
  padding:22px 18px 26px;
  overflow-y:auto;
  background:linear-gradient(180deg,rgba(23,12,41,.98),rgba(11,6,24,.95));
  border-right:1px solid var(--line);
}
.brand-rail::before{
  content:"";
  position:absolute;
  top:0;
  right:-1px;
  width:2px;
  height:190px;
  background:linear-gradient(180deg,var(--cyan),rgba(168,85,247,.5),transparent);
  opacity:.85;
}

.rail-top{display:flex;align-items:center;justify-content:space-between;gap:12px}

.brand-mark{display:inline-flex;align-items:center;gap:10px;color:var(--ink)}
.brand-mark__pixel{display:inline-flex;gap:2px}
.brand-mark__pixel i{
  display:grid;
  place-items:center;
  width:17px;
  height:21px;
  border-radius:3px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  font-style:normal;
  color:#0B0618;
}
.brand-mark__pixel i:nth-child(1){background:var(--neon);box-shadow:0 0 16px rgba(168,85,247,.9)}
.brand-mark__pixel i:nth-child(2){background:var(--volt);box-shadow:0 0 12px rgba(47,123,255,.7)}
.brand-mark__pixel i:nth-child(3){background:var(--cyan);box-shadow:0 0 12px rgba(55,242,214,.6)}
.brand-mark__text{display:flex;flex-direction:column;line-height:1.22}
.brand-mark__text strong{font-size:17px;letter-spacing:.02em}
.brand-mark__text em{
  font-family:var(--font-mono);
  font-size:10px;
  font-style:normal;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--mist);
}

.rail-nav{flex:1 1 auto}
.rail-nav__list{display:flex;flex-direction:column;gap:4px}
.rail-nav__link{
  display:flex;
  align-items:center;
  gap:10px;
  padding:11px 12px;
  border:1px solid transparent;
  border-radius:var(--radius-sm);
  color:var(--mist);
  font-size:15px;
  font-weight:700;
  transition:color .28s var(--ease),background .28s var(--ease),border-color .28s var(--ease),box-shadow .28s var(--ease);
}
.rail-nav__link::before{
  content:"";
  width:6px;
  height:6px;
  border-radius:1px;
  background:var(--line);
  transition:background .28s var(--ease),box-shadow .28s var(--ease);
}
.rail-nav__link:hover{color:var(--ink);background:rgba(168,85,247,.10)}
.rail-nav__link[aria-current="page"]{
  color:var(--ink);
  border-color:rgba(168,85,247,.55);
  background:linear-gradient(90deg,rgba(168,85,247,.30),rgba(47,123,255,.10));
  box-shadow:0 0 0 1px rgba(168,85,247,.16),0 14px 34px -22px rgba(168,85,247,1);
}
.rail-nav__link[aria-current="page"]::before{background:var(--cyan);box-shadow:0 0 10px var(--cyan)}
.rail-nav__link--member .badge{margin-left:auto}

.badge{
  display:inline-flex;
  align-items:center;
  padding:2px 8px;
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:10px;
  font-weight:700;
  letter-spacing:.08em;
}
.badge--member{
  color:var(--amber);
  border:1px solid rgba(255,180,84,.55);
  background:rgba(255,180,84,.10);
}

.rail-cta{margin-top:auto;display:flex;flex-direction:column;gap:10px}
.rail-meta{margin:0;font-size:12px;line-height:1.6;color:var(--mist)}

.top-bar{
  position:fixed;
  top:0;
  right:0;
  left:var(--rail-w);
  z-index:100;
  height:var(--bar-h);
  display:flex;
  align-items:center;
  padding:0 clamp(16px,4vw,40px);
  background:transparent;
  transition:background .32s var(--ease),box-shadow .32s var(--ease);
}
.site-header[data-stuck="true"] .top-bar{
  background:rgba(23,12,41,.92);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  box-shadow:0 1px 0 var(--line),0 22px 44px -34px var(--neon);
}
.top-bar__inner{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
}
.top-bar__brand{
  display:none;
  font-size:16px;
  font-weight:800;
  letter-spacing:.02em;
}
.top-bar__meta{margin:0;font-size:13px;color:var(--mist)}
.top-bar__actions{display:flex;align-items:center;gap:10px}

.read-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  background:rgba(42,27,69,.7);
  overflow:hidden;
}
.read-progress__bar{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--neon),var(--volt) 45%,var(--cyan));
  box-shadow:0 0 12px rgba(55,242,214,.8);
  transition:width .12s linear;
}

.nav-toggle{
  display:none;
  width:42px;
  height:42px;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:4px;
  border:1px solid var(--line);
  border-radius:var(--radius-sm);
  background:rgba(23,12,41,.72);
}
.nav-toggle__bar{
  width:18px;
  height:2px;
  border-radius:2px;
  background:var(--ink);
  transition:transform .26s var(--ease),opacity .26s var(--ease);
}
.site-header[data-open="true"] .nav-toggle__bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
.site-header[data-open="true"] .nav-toggle__bar:nth-child(2){opacity:0}
.site-header[data-open="true"] .nav-toggle__bar:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

.nav-scrim{
  position:fixed;
  inset:0;
  z-index:105;
  background:rgba(6,3,14,.74);
  opacity:0;
  pointer-events:none;
  transition:opacity .3s var(--ease);
}
.site-header[data-open="true"] .nav-scrim{opacity:1;pointer-events:auto}

.mobile-dock{
  display:none;
  position:fixed;
  left:0;
  right:0;
  bottom:0;
  z-index:108;
  padding:12px 16px calc(12px + env(safe-area-inset-bottom,0px));
  background:rgba(11,6,24,.95);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-top:1px solid var(--line);
}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:13px 22px;
  border:1px solid transparent;
  border-radius:999px;
  font-size:15px;
  font-weight:800;
  letter-spacing:.01em;
  text-align:center;
  transition:filter .26s var(--ease),box-shadow .26s var(--ease),border-color .26s var(--ease),color .26s var(--ease),background .26s var(--ease);
}
.btn--amber{
  background:var(--amber);
  color:#20130A;
  box-shadow:0 14px 32px -18px rgba(255,180,84,1);
}
.btn--neon{
  background:linear-gradient(120deg,var(--neon),var(--volt));
  color:#fff;
  box-shadow:0 16px 38px -20px rgba(168,85,247,1),inset 0 0 0 1px rgba(244,241,255,.18);
}
.btn--ghost{
  border-color:var(--line);
  background:rgba(23,12,41,.55);
  color:var(--ink);
}
.btn--sm{padding:9px 16px;font-size:14px}
.btn--block{width:100%}
.btn:hover{filter:brightness(1.12)}
.btn--ghost:hover{border-color:rgba(55,242,214,.7);color:var(--cyan)}
.btn:active{filter:brightness(.96)}

/* ============ 页脚 ============ */
.site-footer{
  position:relative;
  z-index:5;
  margin-top:clamp(64px,9vw,120px);
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(23,12,41,.88),rgba(11,6,24,.99));
}
.footer-inner{
  width:100%;
  max-width:var(--maxw);
  margin:0 auto;
  padding:clamp(40px,6vw,72px) clamp(20px,4vw,40px) 0;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.35fr;
  gap:var(--gap-1);
}
.footer-col{display:flex;flex-direction:column;gap:12px}
.footer-heading{
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:700;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--cyan);
}
.footer-tagline{max-width:34ch;font-size:15px;color:var(--mist)}
.brand-mark--footer{margin-bottom:4px}
.footer-links{display:flex;flex-direction:column;gap:9px;font-size:15px}
.footer-links a{color:var(--mist);transition:color .24s var(--ease)}
.footer-links a:hover{color:var(--ink)}
.footer-contact{display:flex;flex-direction:column;gap:9px;font-size:15px;color:var(--mist)}
.footer-contact .mono{color:var(--ink);font-size:14px}
.footer-contact a{color:var(--cyan);font-weight:700}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  margin-top:var(--gap-2);
  padding-top:22px;
  border-top:1px solid var(--line);
}
.footer-copy,.footer-note{margin:0;font-size:12.5px;color:var(--mist)}
.footer-note{max-width:56ch}
.pixel-strip{display:flex;gap:5px;margin-top:26px;padding-bottom:18px}
.pixel-strip span{flex:1 1 0;min-width:8px;height:8px;border-radius:2px;background:var(--line)}
.pixel-strip span:nth-child(4n+1){background:var(--neon);box-shadow:0 0 14px rgba(168,85,247,.9)}
.pixel-strip span:nth-child(4n+2){background:var(--volt);opacity:.85}
.pixel-strip span:nth-child(4n+3){background:var(--cyan);opacity:.7}
.pixel-strip span:nth-child(4n+4){background:var(--amber);opacity:.45}

/* ============ 通用内容组件 ============ */
.wrap{
  width:100%;
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 clamp(20px,4vw,40px);
}
.prose{max-width:700px}
.prose p{color:var(--mist)}
.prose p + p{margin-top:1.05em}
.prose h2,.prose h3{margin:1.7em 0 .55em;color:var(--ink);line-height:1.25}
.prose strong{color:var(--ink)}

.section{padding:clamp(56px,7vw,96px) 0}
.section--tight{padding:clamp(36px,5vw,56px) 0}
.section-head{display:flex;flex-direction:column;gap:12px;margin-bottom:var(--gap-1)}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:700;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--cyan);
}
.eyebrow::before{content:"";width:22px;height:1px;background:currentColor;opacity:.65}
.section-title{
  font-size:clamp(30px,4.6vw,54px);
  font-weight:900;
  line-height:1.08;
  letter-spacing:-.01em;
  color:var(--ink);
  text-shadow:0 0 1px var(--neon),0 0 34px rgba(168,85,247,.45);
}
.section-sub{max-width:640px;font-size:16px;color:var(--mist)}

.grid{display:grid;gap:var(--gap-1)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}

.panel{
  padding:clamp(20px,3vw,32px);
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  background:linear-gradient(155deg,rgba(38,20,64,.86),rgba(17,9,32,.92));
}
.panel--quiet{background:rgba(23,12,41,.62)}

.figure{
  position:relative;
  margin:0;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  background:linear-gradient(160deg,#241344,#100720);
}
.figure > img{width:100%;height:100%;object-fit:cover}
.figure--wide{aspect-ratio:16/9}
.figure--tall{aspect-ratio:4/5}
.figure--square{aspect-ratio:1/1}
.figure::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:repeating-linear-gradient(to bottom,rgba(55,242,214,.06) 0 1px,transparent 1px 4px);
}
.figure__caption{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  margin:0;
  padding:16px;
  font-size:13px;
  line-height:1.6;
  color:var(--mist);
  background:linear-gradient(180deg,transparent,rgba(11,6,24,.94));
}

.stat{display:flex;flex-direction:column;gap:4px}
.stat__value{
  font-family:var(--font-mono);
  font-size:clamp(28px,3.6vw,40px);
  font-weight:700;
  letter-spacing:.02em;
  color:var(--cyan);
  font-variant-numeric:tabular-nums;
}
.stat__value--amber{color:var(--amber)}
.stat__value--neon{color:var(--neon)}
.stat__label{font-size:14px;color:var(--mist)}

.callout{
  padding:20px 24px;
  border-left:3px solid var(--volt);
  border-radius:var(--radius);
  background:rgba(47,123,255,.10);
}
.callout--warn{border-left-color:var(--rose);background:rgba(255,77,141,.10)}
.callout__title{margin-bottom:6px;font-size:15px;font-weight:800;color:var(--ink)}
.callout p{font-size:15px;color:var(--mist)}

.divider{height:1px;border:0;margin:var(--gap-2) 0;background:linear-gradient(90deg,transparent,var(--line),transparent)}

.chip-row{display:flex;flex-wrap:wrap;gap:10px}
.chip{
  padding:9px 16px;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(23,12,41,.7);
  color:var(--mist);
  font-size:14px;
  font-weight:700;
  transition:color .25s var(--ease),border-color .25s var(--ease),background .25s var(--ease),box-shadow .25s var(--ease);
}
.chip:hover{color:var(--ink);border-color:rgba(168,85,247,.6)}
.chip[aria-pressed="true"]{
  color:var(--ink);
  border-color:var(--cyan);
  background:rgba(55,242,214,.12);
  box-shadow:0 0 24px -12px rgba(55,242,214,1);
}

.tabs{display:flex;flex-wrap:wrap;gap:8px;padding-bottom:12px;border-bottom:1px solid var(--line)}
.tab{
  padding:10px 18px;
  border:1px solid transparent;
  border-radius:999px;
  font-size:15px;
  font-weight:700;
  color:var(--mist);
  transition:color .25s var(--ease),border-color .25s var(--ease),background .25s var(--ease);
}
.tab:hover{color:var(--ink)}
.tab[aria-selected="true"]{
  color:var(--ink);
  border-color:rgba(168,85,247,.65);
  background:linear-gradient(120deg,rgba(168,85,247,.30),rgba(47,123,255,.14));
}
.tabpanel{padding-top:var(--gap-1)}
.tabpanel[hidden]{display:none}

.breadcrumb{font-size:13px;color:var(--mist)}
.breadcrumb__list{display:flex;flex-wrap:wrap;gap:8px}
.breadcrumb__list li{display:flex;align-items:center;gap:8px}
.breadcrumb__list li + li::before{content:"/";color:var(--line)}
.breadcrumb a{color:var(--mist);transition:color .24s var(--ease)}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb__item--current{color:var(--ink);font-weight:700}

.js-on .reveal{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .32s var(--ease),transform .32s var(--ease);
}
.js-on .reveal.is-visible{opacity:1;transform:none}

/* ============ 桌面画布偏移 ============ */
@media (min-width:901px){
  body{padding-left:var(--rail-w)}
}

/* ============ 平板 / 移动 ============ */
@media (max-width:1100px){
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:20px}
}
@media (max-width:1000px){
  .grid--4,.grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:var(--gap-1)}
}
@media (max-width:900px){
  body{padding-left:0;padding-bottom:86px}

  .brand-rail{
    width:min(86vw,320px);
    transform:translateX(-105%);
    transition:transform .34s var(--ease);
    box-shadow:0 0 70px rgba(0,0,0,.65);
    z-index:109;
  }
  .site-header[data-open="true"] .brand-rail{transform:translateX(0)}

  .top-bar{
    left:0;
    padding:0 16px;
    background:rgba(11,6,24,.88);
    backdrop-filter:blur(12px);
    -webkit-backdrop-filter:blur(12px);
    box-shadow:0 1px 0 var(--line);
  }
  .site-header[data-stuck="true"] .top-bar{background:rgba(23,12,41,.96)}
  .top-bar__brand{display:inline-flex}
  .top-bar__meta{display:none}
  .nav-toggle{display:flex}
  .rail-cta{display:none}
  .mobile-dock{display:block}
  main{padding-top:var(--bar-h)}
}
@media (max-width:640px){
  body{font-size:16px}
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .section-title{font-size:clamp(28px,8vw,40px)}
  .footer-bottom{flex-direction:column;align-items:flex-start}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .js-on .reveal{opacity:1;transform:none}
  .brand-rail{transition:none}
  .skip-link{transition:none}
}