:root{
  color-scheme: dark;
  --ink-950:#04100C;
  --ink-900:#061410;
  --ink-800:#0E241C;
  --ink-700:#17352A;
  --lime:#C8FF4A;
  --orange:#FF6B2C;
  --blue:#8FB3C9;
  --paper:#E9F1E4;
  --moss:#6E8579;
  --teal:#3AD8C0;
  --amber:#FFD166;
  --line:rgba(143,179,201,.22);
  --line-strong:rgba(143,179,201,.4);
  --rail-w:236px;
  --bar-h:68px;
  --shell:1280px;
  --pad:clamp(18px,4vw,56px);
  --ease:cubic-bezier(.22,.61,.36,1);
  --font:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --mono:ui-monospace,"SFMono-Regular","Cascadia Mono","Roboto Mono",Consolas,"Courier New",monospace;
}

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

body{
  min-height:100vh;
  background:var(--ink-900);
  color:var(--paper);
  font-family:var(--font);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}

::selection{background:var(--lime);color:var(--ink-900)}

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

.visually-hidden{
  position:absolute;width:1px;height:1px;
  padding:0;margin:-1px;overflow:hidden;
  clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;
}

/* ---------- typography ---------- */
h1,h2,h3,h4{font-weight:900;letter-spacing:-.02em;line-height:1.18}
h1{font-size:clamp(40px,7vw,112px)}
h2{font-size:clamp(26px,3.4vw,44px)}
h3{font-size:clamp(19px,2vw,24px);font-weight:700;letter-spacing:-.01em}
h4{font-size:16px;font-weight:700;letter-spacing:.01em}
p{max-width:68ch}

.kicker{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--blue);
}
.lead{
  font-size:clamp(16px,1.4vw,19px);
  line-height:1.8;
  color:var(--blue);
  max-width:62ch;
}
.muted{color:var(--moss)}
.num{
  font-family:var(--mono);
  font-variant-numeric:tabular-nums;
  font-weight:600;
  letter-spacing:-.03em;
}

/* ---------- layout ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--pad);
}
.section{padding-block:clamp(48px,7vw,96px)}
.section--flush{padding-block-start:0}

.grid{display:grid;gap:24px;grid-template-columns:repeat(12,minmax(0,1fr))}
.grid > *{grid-column:span 12}
@media (min-width:820px){
  .col-3{grid-column:span 3}
  .col-4{grid-column:span 4}
  .col-5{grid-column:span 5}
  .col-6{grid-column:span 6}
  .col-7{grid-column:span 7}
  .col-8{grid-column:span 8}
  .col-9{grid-column:span 9}
  .col-12{grid-column:span 12}
  .start-7{grid-column-start:7}
}

.rule{height:1px;background:var(--line);border:0;margin-block:clamp(32px,5vw,56px)}

.chapter{display:flex;align-items:baseline;gap:16px;flex-wrap:wrap}
.chapter__no{
  font-family:var(--mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(28px,4vw,48px);
  font-weight:600;
  letter-spacing:-.04em;
  color:var(--lime);
  line-height:1;
}
.chapter__title{font-size:clamp(22px,2.4vw,32px);font-weight:900;letter-spacing:-.02em}

/* ---------- buttons & tags ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:12px 22px;
  border:1px solid transparent;
  border-radius:2px;
  font-size:15px;
  font-weight:700;
  line-height:1.3;
  cursor:pointer;
  transition:background .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease),transform .22s var(--ease);
}
.btn--lime{background:var(--lime);color:var(--ink-900)}
.btn--lime:hover{background:#DCFF7F}
.btn--ghost{border-color:var(--line-strong);color:var(--paper);background:transparent}
.btn--ghost:hover{border-color:var(--lime);color:var(--lime)}
.btn:active{transform:translateY(1px)}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:6px 10px;
  border:1px solid var(--line);
  border-radius:2px;
  font-family:var(--mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.16em;
  text-transform:uppercase;
  line-height:1;
  color:var(--blue);
}
.tag--orange{color:var(--orange);border-color:rgba(255,107,44,.42)}
.tag--lime{color:var(--lime);border-color:rgba(200,255,74,.38)}

/* ---------- tiles ---------- */
.tile{
  position:relative;
  padding:clamp(18px,2.4vw,28px);
  background:var(--ink-800);
  border:1px solid var(--line);
  border-radius:2px;
  box-shadow:0 1px 0 rgba(4,16,12,.6);
  transition:background .22s var(--ease),border-color .22s var(--ease),transform .22s var(--ease);
}
.tile:hover{background:var(--ink-700);border-color:rgba(200,255,74,.45)}
.tile--slant{clip-path:polygon(0 18px,100% 0,100% 100%,0 100%)}

/* ---------- data strip ---------- */
.datastrip{
  display:flex;
  overflow-x:auto;
  background:var(--ink-800);
  border-block:1px solid var(--line);
  scrollbar-width:thin;
}
.datastrip__item{
  flex:0 0 auto;
  min-width:190px;
  padding:20px 24px;
  border-inline-end:1px solid var(--line);
}
.datastrip__item:last-child{border-inline-end:0}
.datastrip__label{
  display:block;
  font-family:var(--mono);
  font-size:10px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--moss);
  margin-top:4px;
}

/* ---------- media ---------- */
.media{
  position:relative;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:2px;
  background:linear-gradient(150deg,var(--ink-700),var(--ink-800) 70%,var(--ink-900));
}
.media > img,.media > video,.media > .media__fill{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media--tall{aspect-ratio:3/4}
.media__cap{
  position:absolute;
  inset:auto 0 0 0;
  padding:10px 12px;
  font-family:var(--mono);
  font-size:10px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--paper);
  background:linear-gradient(transparent,rgba(4,16,12,.88));
}

/* ---------- breadcrumbs ---------- */
.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--moss);
}
.crumbs li{display:flex;align-items:center;gap:8px}
.crumbs li + li::before{content:"/";color:var(--line-strong)}
.crumbs a{color:var(--blue)}
.crumbs a:hover{color:var(--lime)}

/* ---------- accordion ---------- */
.acc{
  background:var(--ink-800);
  border:1px solid var(--line);
  border-radius:2px;
  transition:border-color .22s var(--ease);
}
.acc + .acc{margin-top:10px}
.acc > summary{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:18px 20px;
  font-weight:700;
  cursor:pointer;
  list-style:none;
}
.acc > summary::-webkit-details-marker{display:none}
.acc > summary::after{
  content:"▸";
  color:var(--lime);
  font-size:13px;
  transition:transform .22s var(--ease);
}
.acc[open]{border-color:rgba(200,255,74,.42);border-left:3px solid var(--lime)}
.acc[open] > summary::after{transform:rotate(90deg)}
.acc__body{padding:0 20px 20px;color:var(--blue)}
.acc__body p + p{margin-top:.9em}

/* ---------- header ---------- */
.site-header{position:relative;z-index:60}

.read-progress{
  position:fixed;
  top:0;left:0;right:0;
  height:4px;
  background:var(--lime);
  transform:scaleX(0);
  transform-origin:0 50%;
  z-index:90;
  pointer-events:none;
}

.skip-link{
  position:fixed;
  top:10px;left:10px;
  z-index:200;
  padding:10px 16px;
  background:var(--lime);
  color:var(--ink-900);
  font-weight:700;
  border-radius:2px;
  transform:translateY(-180%);
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:none}

.header-bar{
  position:sticky;
  top:0;
  z-index:60;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  min-height:var(--bar-h);
  padding:10px var(--pad);
  background:rgba(6,20,16,.9);
  backdrop-filter:blur(10px) saturate(120%);
  border-top:4px solid rgba(200,255,74,.18);
  border-bottom:1px solid var(--line);
}

.brand{display:flex;align-items:center;gap:12px;flex:none}
.brand__mark{
  font-family:var(--mono);
  font-variant-numeric:tabular-nums;
  font-size:21px;
  font-weight:700;
  letter-spacing:-.02em;
  line-height:1.3;
  color:var(--ink-900);
  background:var(--lime);
  padding:2px 10px 2px 8px;
  clip-path:polygon(0 0,100% 0,calc(100% - 7px) 100%,0 100%);
}
.brand__text{display:flex;flex-direction:column;line-height:1.15}
.brand__name{font-size:17px;font-weight:900;letter-spacing:.04em}
.brand__sub{
  font-family:var(--mono);
  font-size:10px;
  letter-spacing:.16em;
  color:var(--moss);
  text-transform:uppercase;
}

.bar-tools{display:flex;align-items:center;gap:10px}

.quick-search{position:relative;display:flex;align-items:center}
.quick-search::before{
  content:"⌕";
  position:absolute;
  left:12px;
  top:50%;
  transform:translateY(-50%);
  font-size:16px;
  line-height:1;
  color:var(--moss);
  pointer-events:none;
}
.quick-search__input{
  width:250px;
  height:38px;
  padding:0 12px 0 34px;
  background:var(--ink-700);
  border:1px solid var(--line);
  border-radius:2px;
  color:var(--paper);
  font-size:13px;
  transition:border-color .2s var(--ease),background .2s var(--ease);
}
.quick-search__input::placeholder{color:var(--moss)}
.quick-search__input:focus{border-color:var(--lime);background:var(--ink-800);outline-offset:1px}

.search-hits{
  position:absolute;
  top:calc(100% + 8px);
  right:0;
  z-index:70;
  width:340px;
  max-height:62vh;
  overflow-y:auto;
  padding:6px;
  background:var(--ink-800);
  border:1px solid var(--line-strong);
  border-radius:2px;
  box-shadow:0 24px 48px rgba(0,0,0,.55);
}
.search-hit{
  display:flex;
  align-items:center;
  gap:10px;
  padding:10px 12px;
  border-radius:2px;
  font-size:14px;
  transition:background .16s var(--ease);
}
.search-hit:hover,.search-hit:focus-visible{background:var(--ink-700)}
.search-hit__type{
  flex:none;
  padding:2px 6px;
  border:1px solid rgba(255,107,44,.4);
  font-family:var(--mono);
  font-size:10px;
  letter-spacing:.14em;
  line-height:1.5;
  color:var(--orange);
}
.search-hit__label{color:var(--paper);line-height:1.5}
.search-hits__empty{
  padding:14px 12px;
  font-size:13px;
  color:var(--moss);
}

.icon-btn,.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  height:38px;
  padding:0 12px;
  background:transparent;
  border:1px solid var(--line);
  border-radius:2px;
  color:var(--paper);
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.16em;
  cursor:pointer;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.icon-btn:hover,.nav-toggle:hover{border-color:var(--lime);color:var(--lime)}

.nav-toggle__bars{display:flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle__bars span{display:block;height:2px;background:currentColor;transition:transform .22s var(--ease),opacity .22s var(--ease)}
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(2){opacity:0}
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

.rail{
  position:fixed;
  top:0;left:0;
  z-index:58;
  display:flex;
  flex-direction:column;
  gap:20px;
  width:var(--rail-w);
  height:100dvh;
  padding:24px 16px 18px;
  background:var(--ink-800);
  border-top:4px solid rgba(200,255,74,.18);
  border-right:1px solid var(--line);
  overflow-y:auto;
}
.rail__kicker{
  font-family:var(--mono);
  font-size:10px;
  letter-spacing:.24em;
  color:var(--moss);
  padding-inline-start:16px;
}
.rail__list{display:flex;flex-direction:column;gap:2px}
.rail__link{
  position:relative;
  display:flex;
  align-items:baseline;
  gap:12px;
  padding:12px 14px 12px 18px;
  border-radius:2px;
  font-size:15px;
  font-weight:500;
  color:var(--paper);
  transition:background .2s var(--ease),color .2s var(--ease);
}
.rail__link::before{
  content:"";
  position:absolute;
  left:0;top:50%;
  width:3px;height:0;
  background:var(--lime);
  transform:translateY(-50%);
  transition:height .22s var(--ease);
}
.rail__link:hover{background:var(--ink-700)}
.rail__link:hover::before{height:52%}
.rail__link[aria-current="page"]{background:var(--ink-700);color:var(--lime);font-weight:700}
.rail__link[aria-current="page"]::before{height:72%}
.rail__no{
  font-family:var(--mono);
  font-variant-numeric:tabular-nums;
  font-size:11px;
  letter-spacing:.12em;
  color:var(--moss);
}
.rail__link[aria-current="page"] .rail__no{color:var(--lime)}
.rail__foot{margin-top:auto;padding-top:14px;border-top:1px solid var(--line)}
.rail__meta{
  font-family:var(--mono);
  font-size:10px;
  letter-spacing:.1em;
  color:var(--moss);
  padding-inline-start:18px;
  word-break:break-all;
}
.nav-scrim{display:none}

/* ---------- footer ---------- */
.site-footer{
  margin-top:clamp(64px,9vw,120px);
  background:var(--ink-800);
  border-top:1px solid var(--line);
  padding-block:clamp(40px,6vw,64px) 22px;
}
.footer-shell{
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--pad);
  display:grid;
  gap:clamp(28px,4vw,48px);
  grid-template-columns:1fr;
}
.footer-brand__mark{
  display:inline-block;
  font-size:20px;
  font-weight:900;
  letter-spacing:.02em;
  color:var(--lime);
}
.footer-brand__note{
  margin-top:6px;
  font-family:var(--mono);
  font-size:10px;
  letter-spacing:.18em;
  color:var(--moss);
  text-transform:uppercase;
}
.footer-cols{display:grid;gap:24px;grid-template-columns:repeat(2,minmax(0,1fr))}
.footer-col__title{
  margin-bottom:10px;
  font-family:var(--mono);
  font-size:10px;
  font-weight:600;
  letter-spacing:.2em;
  color:var(--blue);
  text-transform:uppercase;
}
.footer-list{display:flex;flex-direction:column;gap:8px}
.footer-list a{
  font-size:14px;
  color:var(--paper);
  transition:color .18s var(--ease);
  border-bottom:1px solid transparent;
}
.footer-list a:hover{color:var(--lime);border-bottom-color:rgba(200,255,74,.4)}

.footer-contact{
  max-width:var(--shell);
  margin:clamp(28px,4vw,44px) auto 0;
  padding:clamp(20px,3vw,28px) var(--pad) 0;
  border-top:1px solid var(--line);
}
.footer-contact__list{display:flex;flex-wrap:wrap;gap:10px 34px}
.footer-contact__item{
  display:flex;
  align-items:baseline;
  gap:10px;
  font-size:13px;
}
.footer-contact__key{
  font-family:var(--mono);
  font-size:10px;
  letter-spacing:.16em;
  color:var(--moss);
  text-transform:uppercase;
  flex:none;
}
.footer-contact__val{color:var(--paper);word-break:break-all}
.footer-contact__note{
  margin-top:12px;
  font-size:12px;
  line-height:1.7;
  color:var(--moss);
  max-width:70ch;
}

.footer-legal{
  max-width:var(--shell);
  margin:clamp(20px,3vw,30px) auto 0;
  padding:16px var(--pad) 0;
  border-top:1px solid var(--line);
  display:flex;
  flex-wrap:wrap;
  gap:8px 24px;
  align-items:baseline;
  justify-content:space-between;
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--moss);
}

/* ---------- reveal ---------- */
html.js [data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .32s var(--ease),transform .32s var(--ease);
}
html.js [data-reveal].is-in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (min-width:820px){
  .footer-shell{grid-template-columns:minmax(180px,1fr) 2.2fr}
  .footer-cols{grid-template-columns:repeat(3,minmax(0,1fr))}
}

@media (min-width:1080px){
  body{padding-inline-start:var(--rail-w)}
  .read-progress{left:var(--rail-w)}
}

@media (max-width:1079px){
  :root{--bar-h:62px}
  .icon-btn,.nav-toggle{display:inline-flex}
  .quick-search{
    position:absolute;
    left:0;right:0;top:100%;
    display:none;
    z-index:65;
    padding:12px var(--pad) 14px;
    background:var(--ink-800);
    border-bottom:1px solid var(--line);
    box-shadow:0 18px 30px rgba(0,0,0,.45);
  }
  .quick-search::before{display:none}
  .quick-search__input{width:100%;height:42px;padding-left:14px;font-size:14px}
  .site-header[data-search="true"] .quick-search{display:block}
  .search-hits{
    position:static;
    width:100%;
    max-height:46vh;
    margin-top:8px;
    box-shadow:none;
  }
  .rail{
    top:var(--bar-h);
    bottom:0;
    height:auto;
    width:min(88vw,340px);
    padding-top:18px;
    border-top:0;
    border-left:1px solid var(--line);
    box-shadow:-24px 0 60px rgba(0,0,0,.55);
    transform:translateX(102%);
    visibility:hidden;
    transition:transform .28s var(--ease),visibility .28s var(--ease);
  }
  .site-header[data-open="true"] .rail{transform:none;visibility:visible}
  .nav-scrim{
    display:block;
    position:fixed;
    inset:0;
    z-index:56;
    background:rgba(4,16,12,.74);
    backdrop-filter:blur(2px);
    opacity:0;
    pointer-events:none;
    transition:opacity .24s var(--ease);
  }
  .site-header[data-open="true"] .nav-scrim{opacity:1;pointer-events:auto}
}

@media (max-width:620px){
  .brand__sub{display:none}
  .brand__mark{font-size:18px}
  .brand__name{font-size:15px}
  .nav-toggle__label{display:none}
  .nav-toggle{padding:0 10px}
  .icon-btn{padding:0 10px}
  .search-hits{width:100%}
  .footer-contact__list{flex-direction:column;gap:8px}
  .footer-legal{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;
  }
  html.js [data-reveal]{opacity:1;transform:none}
  .read-progress{transition:none}
}