:root{
  --ink:#06101D;
  --panel:#0C1D31;
  --line:#1B3550;
  --mint:#33F0C0;
  --mint-soft:#B8FFEA;
  --amber:#FFAE2B;
  --cream:#F2E8D5;
  --mist:#8CA3B8;
  --alert:#D95B2B;
  --white:#FFFFFF;
  --wrap:1280px;
  --gutter:clamp(18px,4vw,40px);
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg{max-width:100%;height:auto}
button{font:inherit;color:inherit}
a{color:inherit;text-decoration:none}
[hidden]{display:none!important}

html,body{background-color:var(--ink)}
body{
  background-image:
    linear-gradient(to right,rgba(27,53,80,.34) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(27,53,80,.16) 1px,transparent 1px);
  background-size:96px 96px,96px 96px;
  color:var(--cream);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
}

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

.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1}

.wrap{width:calc(100% - var(--gutter) * 2);max-width:var(--wrap);margin-inline:auto}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;top:0;left:50%;z-index:200;
  transform:translate(-50%,-140%);
  display:inline-block;padding:11px 22px;
  background:var(--mint);color:var(--ink);
  font-size:13px;letter-spacing:.12em;
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translate(-50%,0)}

/* ---------- header ---------- */
.site-header{
  position:relative;
  background:rgba(6,16,29,.96);
  color:var(--cream);
  border-bottom:1px solid var(--line);
  z-index:60;
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;
  background:linear-gradient(90deg,transparent,rgba(51,240,192,.4) 28%,rgba(27,53,80,.9) 62%,transparent);
  pointer-events:none;
}
.header-rail{border-bottom:1px dashed rgba(27,53,80,.85)}
.header-rail__inner{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  min-height:38px;
}
.header-rail__meta{
  font-size:11px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--mist);white-space:nowrap;
}
.header-rail__meta:last-child{color:var(--amber)}

.masthead{
  position:relative;
  display:flex;align-items:center;justify-content:center;
  padding:clamp(20px,3.2vw,32px) 0 clamp(16px,2.4vw,24px);
}
.masthead::before,
.masthead::after{
  content:"";position:absolute;top:50%;height:1px;
  width:clamp(20px,7vw,110px);
  background:linear-gradient(90deg,transparent,var(--line));
  pointer-events:none;
}
.masthead::before{left:0}
.masthead::after{right:0;background:linear-gradient(270deg,transparent,var(--line))}

.brand{display:flex;flex-direction:column;align-items:center;gap:8px;text-align:center}
.brand__mark{
  font-size:clamp(1.9rem,4.8vw,3.15rem);
  font-weight:400;line-height:1.08;
  letter-spacing:.34em;text-indent:.34em;
  color:var(--cream);
}
.brand__sub{
  font-size:11px;letter-spacing:.4em;text-indent:.4em;
  color:var(--mist);text-transform:uppercase;
}

.entry-chip{
  position:absolute;right:0;top:50%;transform:translateY(-50%);
  display:inline-flex;align-items:center;gap:9px;
  padding:8px 16px;
  border:1px solid rgba(51,240,192,.5);
  color:var(--mint);
  font-size:12px;letter-spacing:.18em;white-space:nowrap;
  background:rgba(51,240,192,.05);
  clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);
  transition:border-color .2s var(--ease),background-color .2s var(--ease),color .2s var(--ease);
}
.entry-chip:hover,.entry-chip:focus-visible{
  border-color:var(--mint);color:var(--mint-soft);background:rgba(51,240,192,.13);
}
.entry-chip__dot{
  width:7px;height:7px;flex:0 0 auto;border-radius:50%;
  background:var(--mint);box-shadow:0 0 0 3px rgba(51,240,192,.16);
}

.nav-band{border-top:1px solid rgba(27,53,80,.55)}
.nav-band__inner{
  display:flex;align-items:center;justify-content:center;
  min-height:54px;
}
.site-nav{width:100%}
.nav-list{display:flex;flex-wrap:wrap;justify-content:center;gap:clamp(14px,2.6vw,36px)}
.nav-link{
  display:inline-block;padding:15px 0 13px;
  font-size:14px;letter-spacing:.16em;
  color:var(--mist);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.nav-link:hover,.nav-link:focus-visible{color:var(--mint-soft);border-bottom-color:rgba(51,240,192,.5)}
.nav-link[aria-current="page"]{color:var(--mint);border-bottom-color:var(--mint)}

.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:9px 16px;
  background:transparent;
  border:1px solid var(--line);
  color:var(--cream);
  font-size:12px;letter-spacing:.22em;
  cursor:pointer;
  clip-path:polygon(9px 0,100% 0,100% calc(100% - 9px),calc(100% - 9px) 100%,0 100%,0 9px);
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover,.nav-toggle:focus-visible{border-color:var(--mint);color:var(--mint)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:4px;width:18px}
.nav-toggle__bars span{
  display:block;height:1.5px;width:100%;
  background:currentColor;transform-origin:center;
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.nav-toggle__label{line-height:1}

/* ---------- footer ---------- */
.site-footer{
  margin-top:clamp(48px,8vw,100px);
  background:linear-gradient(180deg,rgba(12,29,49,.55),rgba(4,11,20,.96) 62%);
  border-top:1px solid var(--line);
  color:var(--cream);
}
.footer-top{
  display:grid;
  grid-template-columns:minmax(240px,1fr) minmax(0,1.9fr);
  gap:clamp(26px,4vw,60px);
  padding:clamp(40px,6vw,74px) 0 clamp(28px,4vw,46px);
}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:10px;max-width:340px}
.footer-brand__mark{
  font-size:clamp(1.4rem,2.6vw,1.9rem);
  letter-spacing:.3em;text-indent:.3em;line-height:1.2;
}
.footer-brand__sub{font-size:10px;letter-spacing:.36em;color:var(--mist);text-transform:uppercase}
.footer-brand__note{
  font-size:13px;line-height:1.7;color:var(--mist);
  border-left:1px solid var(--line);padding-left:12px;margin:6px 0 14px;
}
.footer-cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(16px,3vw,32px)}
.footer-col__title{
  font-size:11px;letter-spacing:.28em;color:var(--amber);
  text-transform:uppercase;margin-bottom:14px;
}
.footer-links{display:flex;flex-direction:column;gap:9px}
.footer-link{
  font-size:14px;color:rgba(242,232,213,.82);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-link:hover,.footer-link:focus-visible{color:var(--mint-soft);border-bottom-color:rgba(184,255,234,.45)}

.footer-bottom{border-top:1px dashed var(--line)}
.footer-bottom__inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 24px;
  padding:18px 0 22px;
  font-size:12px;color:var(--mist);letter-spacing:.06em;
}
.footer-contact{color:var(--mist)}
.footer-copy{color:rgba(140,163,184,.85)}
.footer-icp{color:rgba(140,163,184,.85);letter-spacing:.1em}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  min-height:46px;padding:0 24px;
  background:var(--mint);color:var(--ink);
  border:1px solid var(--mint);
  font-size:14px;letter-spacing:.14em;line-height:1;
  cursor:pointer;
  clip-path:polygon(11px 0,100% 0,100% calc(100% - 11px),calc(100% - 11px) 100%,0 100%,0 11px);
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.btn:hover,.btn:focus-visible{background:var(--mint-soft);border-color:var(--mint-soft);transform:translateY(-2px)}
.btn--ghost{
  background:transparent;color:var(--mint);
  border-color:rgba(51,240,192,.55);
}
.btn--ghost:hover,.btn--ghost:focus-visible{
  background:rgba(51,240,192,.1);color:var(--mint-soft);border-color:var(--mint);
}

/* ---------- panels / tags / chapters ---------- */
.panel{
  position:relative;
  background:var(--panel);
  border:1px solid var(--line);
  padding:clamp(18px,2.4vw,28px);
  clip-path:polygon(0 0,calc(100% - 20px) 0,100% 20px,100% 100%,20px 100%,0 calc(100% - 20px));
}
.panel--flush{padding:0}
.panel--soft{background:rgba(12,29,49,.55)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 10px;
  border:1px solid var(--line);
  color:var(--mist);
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:11px;letter-spacing:.14em;line-height:1.6;
  white-space:nowrap;
}
.tag--mint{color:var(--mint);border-color:rgba(51,240,192,.45)}
.tag--amber{color:var(--amber);border-color:rgba(255,174,43,.45)}
.tag--alert{color:var(--alert);border-color:rgba(217,91,43,.5)}

.chapter{
  display:flex;align-items:baseline;gap:14px;
  border-top:1px solid var(--line);
  padding-top:12px;margin-bottom:22px;
}
.chapter__num{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:12px;letter-spacing:.22em;color:var(--amber);
}
.chapter__label{font-size:12px;letter-spacing:.26em;color:var(--mist);text-transform:uppercase}

.rail{
  position:sticky;top:28px;
  display:flex;flex-direction:column;gap:14px;
  padding:18px 20px;
  background:rgba(12,29,49,.82);
  border:1px solid var(--line);
  border-left:2px solid var(--mint);
  font-size:13px;
}
.rail__title{font-size:11px;letter-spacing:.26em;color:var(--amber);text-transform:uppercase}
.rail__row{display:flex;align-items:baseline;justify-content:space-between;gap:12px;border-top:1px dashed rgba(27,53,80,.9);padding-top:9px;color:var(--mist)}
.rail__row span:last-child{font-family:var(--font-mono);color:var(--cream)}

/* ---------- media ---------- */
.media-frame{
  position:relative;
  display:block;width:100%;
  overflow:hidden;
  background:
    linear-gradient(155deg,rgba(27,53,80,.75),rgba(6,16,29,.95) 72%),
    var(--panel);
  border:1px solid var(--line);
  clip-path:polygon(0 0,calc(100% - 24px) 0,100% 24px,100% 100%,24px 100%,0 calc(100% - 24px));
}
.media-frame img{display:block;width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-frame__caption{
  display:block;margin-top:10px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--mist);
}

/* ---------- breadcrumb / prose / grid ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding:18px 0 0;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  color:var(--mist);
}
.breadcrumb a{color:var(--mist);transition:color .2s var(--ease)}
.breadcrumb a:hover,.breadcrumb a:focus-visible{color:var(--mint-soft)}
.breadcrumb__sep{color:var(--line)}
.breadcrumb [aria-current="page"]{color:var(--amber)}

.prose{max-width:68ch;color:rgba(242,232,213,.9)}
.prose > * + *{margin-top:1em}
.prose h1{font-size:clamp(2rem,4.6vw,3.2rem);font-weight:400;line-height:1.16;letter-spacing:.06em;color:var(--cream);margin-top:0}
.prose h2{font-size:clamp(1.35rem,2.4vw,1.9rem);font-weight:400;line-height:1.3;letter-spacing:.06em;color:var(--cream);margin-top:1.9em}
.prose h3{font-size:1.1rem;font-weight:500;letter-spacing:.08em;color:var(--mint-soft);margin-top:1.6em}
.prose p{font-size:17px;line-height:1.8}
.prose a{color:var(--mint-soft);border-bottom:1px solid rgba(184,255,234,.4)}
.prose a:hover{border-bottom-color:var(--mint)}
.prose ul,.prose ol{padding-left:1.2em}
.prose ul > li{list-style:none;position:relative;padding-left:16px;margin-top:.4em}
.prose ul > li::before{content:"";position:absolute;left:0;top:.72em;width:7px;height:1px;background:var(--amber)}
.prose ol{list-style:decimal;padding-left:1.4em}
.prose ol > li{margin-top:.4em}
.prose blockquote{
  border-left:2px solid var(--mint);
  padding:4px 0 4px 18px;
  color:var(--mist);font-size:15px;
}
.prose code{
  font-family:var(--font-mono);font-size:.9em;
  background:rgba(27,53,80,.6);padding:2px 6px;color:var(--mint-soft);
}

.grid{display:grid;gap:clamp(18px,2.4vw,28px)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.col-8{grid-column:span 8;min-width:0}
.col-4{grid-column:span 4;min-width:0}
.col-6{grid-column:span 6;min-width:0}
.col-12{grid-column:1/-1;min-width:0}

/* ---------- filter ---------- */
.filter-bar{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:22px}
.filter-btn{
  appearance:none;
  padding:8px 15px;
  background:transparent;
  border:1px solid var(--line);
  color:var(--mist);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;line-height:1;
  cursor:pointer;
  transition:color .2s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease);
}
.filter-btn:hover,.filter-btn:focus-visible{color:var(--mint-soft);border-color:rgba(51,240,192,.5)}
.filter-btn[aria-pressed="true"]{background:var(--mint);border-color:var(--mint);color:var(--ink)}
.filter-empty{
  display:none;
  padding:18px 20px;
  border:1px dashed var(--line);
  color:var(--mist);font-size:14px;
}
.filter-empty.is-visible{display:block}

/* ---------- js ui ---------- */
.scroll-progress{
  position:fixed;top:0;left:0;z-index:120;
  width:0;height:2px;
  background:linear-gradient(90deg,var(--mint),var(--amber));
  pointer-events:none;
}
.to-top{
  position:fixed;right:clamp(14px,3vw,28px);bottom:clamp(14px,3vw,28px);z-index:100;
  display:none;align-items:center;justify-content:center;
  padding:11px 16px;
  background:rgba(12,29,49,.94);
  border:1px solid var(--line);
  color:var(--cream);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;line-height:1;
  cursor:pointer;
  backdrop-filter:blur(8px);
  clip-path:polygon(9px 0,100% 0,100% calc(100% - 9px),calc(100% - 9px) 100%,0 100%,0 9px);
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.to-top.is-visible{display:inline-flex}
.to-top:hover,.to-top:focus-visible{border-color:var(--mint);color:var(--mint)}

[data-reveal-ready]{opacity:0;transform:translateY(14px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
[data-reveal-ready].is-visible{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1024px){
  .grid--12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .col-8,.col-4,.col-6{grid-column:span 6}
  .rail{position:static;flex-direction:row;flex-wrap:wrap;align-items:center;gap:10px 22px;border-left-width:1px;border-top:2px solid var(--mint);padding:14px 18px}
  .rail__row{border-top:0;padding-top:0}
  .footer-top{grid-template-columns:1fr}
  .footer-brand{max-width:none}
}

@media (max-width:880px){
  .header-rail__inner{min-height:34px}
  .header-rail__meta{font-size:10px;letter-spacing:.14em}
  .masthead{flex-direction:column;gap:14px;padding:18px 0 16px}
  .masthead::before,.masthead::after{display:none}
  .brand__mark{letter-spacing:.24em;text-indent:.24em}
  .brand__sub{font-size:10px;letter-spacing:.3em;text-indent:.3em}
  .entry-chip{position:static;transform:none;padding:7px 14px;font-size:11px;letter-spacing:.16em}

  .nav-band__inner{flex-direction:column;align-items:stretch;gap:8px;padding:10px 0 14px;min-height:0}
  .nav-toggle{display:inline-flex;align-self:center}
  .site-nav{display:none}
  .site-header[data-open] .site-nav{display:block}
  .nav-list{
    flex-direction:column;gap:0;
    margin-top:10px;
    border-top:1px solid var(--line);
  }
  .nav-list > li{border-bottom:1px solid rgba(27,53,80,.7)}
  .nav-link{display:block;padding:15px 4px;font-size:15px;border-bottom:1px solid transparent}
  .nav-link[aria-current="page"]{border-bottom-color:transparent;color:var(--mint);box-shadow:inset 2px 0 0 var(--mint);padding-left:12px}
  .site-header[data-open] .nav-toggle__bars span:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
  .site-header[data-open] .nav-toggle__bars span:nth-child(2){opacity:0}
  .site-header[data-open] .nav-toggle__bars span:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}

  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:22px 18px}
  .footer-bottom__inner{flex-direction:column;align-items:flex-start;gap:8px}
}

@media (max-width:640px){
  body{font-size:16px;background-size:64px 64px,64px 64px}
  .grid--12{grid-template-columns:1fr}
  .col-8,.col-4,.col-6{grid-column:1/-1}
  .prose p{font-size:16px}
  .filter-bar{gap:6px}
  .filter-btn{padding:7px 12px;font-size:11px}
  .to-top{right:14px;bottom:14px;padding:10px 13px;font-size:11px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  [data-reveal-ready]{opacity:1;transform:none}
  .btn:hover,.btn:focus-visible{transform:none}
}