*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{max-width:100%;display:block}
button{font:inherit;color:inherit;background:none;border:0}
a{color:inherit}
:root{
  --ink:#0A0C0E;
  --steel:#12171B;
  --grid:#1B2228;
  --line:#2C353D;
  --orange:#FF5A1F;
  --lime:#C8FF3D;
  --blue:#4FA8FF;
  --white:#F4F6F7;
  --muted:#9BA5AD;
  --red:#E33B2E;
  --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  --mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --header-h:68px;
  --header-h-sm:52px;
  --w-max:1280px;
  --pad:clamp(16px,4vw,48px);
  --ease:cubic-bezier(.22,.61,.36,1);
}
body{
  background:var(--ink);
  color:var(--white);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4{line-height:1.15;font-weight:700;letter-spacing:-.01em}
strong{font-weight:700}
.mono{font-family:var(--mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
:focus-visible{outline:2px solid var(--lime);outline-offset:3px}
.skip-link{
  position:fixed;top:8px;left:8px;z-index:200;
  transform:translateY(-180%);
  background:var(--orange);color:#0A0C0E;
  font-size:13px;font-weight:700;letter-spacing:.04em;
  padding:10px 18px;text-decoration:none;
  transition:transform .16s var(--ease);
}
.skip-link:focus{transform:none}

/* ---------- header ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:90;
  background:rgba(10,12,14,.46);
  border-bottom:1px solid transparent;
  transition:background .2s var(--ease),border-color .2s var(--ease);
}
.site-header[data-scrolled="true"]{
  background:rgba(10,12,14,.97);
  border-bottom-color:var(--line);
}
.header-inner{
  max-width:var(--w-max);margin:0 auto;padding:0 var(--pad);
  height:var(--header-h);
  display:flex;align-items:center;gap:16px;
  transition:height .2s var(--ease);
}
.site-header[data-scrolled="true"] .header-inner{height:var(--header-h-sm)}
.brand{
  display:inline-flex;align-items:center;gap:10px;flex:none;
  text-decoration:none;color:var(--white);
}
.brand-bar{
  width:4px;height:24px;background:var(--orange);flex:none;
  transition:height .2s var(--ease);
}
.site-header[data-scrolled="true"] .brand-bar{height:20px}
.brand-name{font-weight:900;font-size:19px;letter-spacing:.01em}
.brand-ver{
  font-family:var(--mono);font-size:11px;letter-spacing:.16em;
  color:var(--muted);padding-left:10px;border-left:1px solid var(--line);
  line-height:1.1;
}
.site-nav{margin-left:auto}
.nav-list{display:flex;align-items:center;gap:2px;counter-reset:navitem}
.nav-item{counter-increment:navitem}
.nav-link{
  position:relative;display:inline-block;
  padding:10px 12px;font-size:14px;
  color:var(--muted);text-decoration:none;
  transition:color .14s var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:12px;right:12px;bottom:5px;height:1px;
  background:var(--orange);transform:scaleX(0);transform-origin:left;
  transition:transform .16s var(--ease);
}
.nav-link:hover{color:var(--white)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--white);font-weight:700}
.nav-link[aria-current="page"]::after{transform:scaleX(1);background:var(--lime)}
.header-cta{
  flex:none;margin-left:12px;
  background:var(--orange);color:#0A0C0E;
  font-size:13px;font-weight:700;letter-spacing:.06em;
  padding:9px 18px;text-decoration:none;
  clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);
  transition:transform .14s var(--ease),background .14s var(--ease);
}
.header-cta:hover{transform:translate(2px,-2px);background:#FF743F}
.nav-toggle{
  display:none;align-items:center;gap:9px;margin-left:auto;
  padding:8px 11px;border:1px solid var(--line);
  background:rgba(27,34,40,.65);color:var(--white);
  font-size:12px;letter-spacing:.12em;cursor:pointer;
  transition:border-color .14s var(--ease);
}
.nav-toggle:hover{border-color:var(--orange)}
.nav-toggle-bars{position:relative;display:block;width:16px;height:2px;background:var(--orange)}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";position:absolute;left:0;width:16px;height:2px;background:var(--orange);
  transition:transform .16s var(--ease),top .16s var(--ease);
}
.nav-toggle-bars::before{top:-5px}
.nav-toggle-bars::after{top:5px}
.site-header[data-open] .nav-toggle-bars{background:transparent}
.site-header[data-open] .nav-toggle-bars::before{top:0;transform:rotate(45deg)}
.site-header[data-open] .nav-toggle-bars::after{top:0;transform:rotate(-45deg)}
.scroll-progress{position:absolute;left:0;right:0;bottom:0;height:2px;pointer-events:none}
.scroll-progress-bar{
  display:block;height:100%;width:100%;background:var(--orange);
  transform:scaleX(0);transform-origin:left;
  transition:transform .1s linear;
}

/* ---------- side rail ---------- */
.rail{
  position:fixed;right:0;top:50%;transform:translateY(-50%);
  z-index:70;display:flex;flex-direction:column;gap:1px;
}
.rail-link{
  writing-mode:vertical-rl;text-orientation:mixed;
  font-size:12px;letter-spacing:.16em;text-decoration:none;
  color:var(--muted);background:var(--steel);
  border:1px solid var(--line);border-right:0;
  padding:16px 7px;
  transition:color .14s var(--ease),background .14s var(--ease),transform .14s var(--ease);
}
.rail-link:hover{color:var(--ink);background:var(--lime);transform:translateX(-2px)}
.rail-link:nth-child(2):hover{background:var(--blue)}

/* ---------- mobile dock ---------- */
.dock{display:none}
.dock-link{
  display:block;padding:12px 4px 14px;text-align:center;
  font-size:13px;letter-spacing:.08em;text-decoration:none;
  color:var(--muted);border-left:1px solid var(--line);
  transition:color .14s var(--ease),background .14s var(--ease);
}
.dock-link:first-child{border-left:0}
.dock-link:hover,.dock-link:focus-visible{color:var(--lime)}

/* ---------- footer ---------- */
.site-footer{
  position:relative;margin-top:clamp(56px,9vw,110px);
  background:var(--steel);border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;
  width:min(180px,42%);height:2px;background:var(--orange);
}
.footer-inner{
  max-width:var(--w-max);margin:0 auto;
  padding:clamp(32px,5vw,56px) var(--pad) 0;
}
.footer-top{
  display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.7fr);
  gap:clamp(24px,4vw,56px);
  padding-bottom:clamp(24px,3vw,36px);
}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:12px}
.brand--footer .brand-name{font-size:22px;letter-spacing:.02em}
.brand--footer .brand-bar{height:26px}
.footer-tagline{font-size:14px;line-height:1.65;color:var(--muted);max-width:22em}
.footer-stamp{
  font-size:11px;letter-spacing:.18em;color:var(--orange);
  border:1px solid var(--line);padding:4px 9px;
}
.footer-cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.footer-col-title{
  display:flex;align-items:baseline;gap:8px;
  font-size:13px;font-weight:700;letter-spacing:.1em;
  margin-bottom:14px;color:var(--white);
}
.footer-col-title .idx{font-family:var(--mono);font-size:11px;letter-spacing:.04em;color:var(--orange)}
.footer-list{display:grid;gap:10px}
.footer-list a{
  font-size:14px;color:var(--muted);text-decoration:none;
  border-bottom:1px solid transparent;padding-bottom:1px;
  transition:color .14s var(--ease),border-color .14s var(--ease);
}
.footer-list a:hover{color:var(--white);border-bottom-color:var(--orange)}
.footer-facts{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:18px 0}
.footer-contact{display:flex;flex-wrap:wrap;gap:10px 32px;font-style:normal}
.fact{display:inline-flex;align-items:baseline;gap:8px;font-size:13px}
.fact-k{font-size:11px;letter-spacing:.16em;color:var(--orange)}
.fact-v{color:var(--muted);word-break:break-all}
.footer-sub{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:16px;padding:26px 0 30px;
}
.footer-sub-text{font-size:15px;color:var(--white);max-width:34em}
.footer-base{
  max-width:var(--w-max);margin:0 auto;
  padding:16px var(--pad) 22px;
  display:flex;align-items:center;flex-wrap:wrap;gap:12px;
  font-size:12px;color:var(--muted);letter-spacing:.04em;
  border-top:1px solid var(--line);
}
.footer-base-sep{width:24px;height:1px;background:var(--line)}

/* ---------- generic layout ---------- */
.wrap{
  width:100%;max-width:var(--w-max);margin:0 auto;
  padding-left:var(--pad);padding-right:var(--pad);
}
.page-main{padding-top:calc(var(--header-h) + 40px)}
.page-main--flush{padding-top:var(--header-h)}
#main-content{scroll-margin-top:calc(var(--header-h) + 12px)}
.divider{height:1px;background:var(--line);border:0;margin:0}
.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--aside{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.grid--halves{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--thirds{grid-template-columns:repeat(3,minmax(0,1fr))}

/* ---------- buttons & tags ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 22px;font-size:14px;font-weight:700;letter-spacing:.02em;
  text-decoration:none;color:var(--white);
  background:var(--grid);border:1px solid var(--line);
  transition:transform .14s var(--ease),border-color .14s var(--ease),background .14s var(--ease),color .14s var(--ease);
}
.btn:hover{transform:translate(2px,-2px);border-color:var(--orange)}
.btn-cut{
  background:var(--orange);color:#0A0C0E;border-color:var(--orange);
  clip-path:polygon(12px 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%,0 12px);
}
.btn-cut:hover{background:#FF743F;border-color:#FF743F;transform:translate(2px,-2px)}
.btn-cut:focus-visible{outline:none;box-shadow:inset 0 0 0 2px var(--lime)}
.tag-cut{
  display:inline-block;padding:4px 12px;
  font-size:11px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;
  background:var(--grid);color:var(--lime);border:1px solid var(--line);
  clip-path:polygon(8px 0,100% 0,100% 100%,0 100%,0 8px);
  transition:transform .14s var(--ease),background .14s var(--ease),color .14s var(--ease);
}
.tag-cut:hover{transform:translate(2px,-2px)}
.chapter-num{
  display:block;font-family:var(--mono);font-weight:700;
  font-size:clamp(40px,7vw,88px);line-height:.9;
  color:var(--line);font-variant-numeric:tabular-nums;
  transition:color .16s var(--ease);
}
[data-chapter].is-current .chapter-num{color:var(--orange)}

/* ---------- breadcrumb ---------- */
.breadcrumb{font-size:12px;letter-spacing:.04em;color:var(--muted)}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb li{display:flex;align-items:center;gap:8px}
.breadcrumb li::after{content:"/";color:var(--line)}
.breadcrumb li:last-child::after{content:""}
.breadcrumb a{color:var(--muted);text-decoration:none;transition:color .14s var(--ease)}
.breadcrumb a:hover{color:var(--orange)}

/* ---------- media frame ---------- */
.media-frame{
  position:relative;overflow:hidden;
  aspect-ratio:16/9;
  background-color:var(--grid);
  background-image:
    linear-gradient(90deg,var(--line) 1px,transparent 1px),
    linear-gradient(0deg,var(--line) 1px,transparent 1px);
  background-size:40px 40px;
  background-position:center;
  border:1px solid var(--line);
}
.media-frame--portrait{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:4/5}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  border:1px solid rgba(244,246,247,.07);
}

/* ---------- table ---------- */
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
.table-scroll table{min-width:560px}
.data-table{width:100%;border-collapse:collapse;font-size:14px}
.data-table th,.data-table td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--line)}
.data-table thead th{
  font-size:11px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;
  color:var(--muted);background:var(--steel);
}
.data-table tbody tr{transition:background .14s var(--ease)}
.data-table tbody tr:hover{background:var(--steel)}
.data-table .num{font-family:var(--mono);font-variant-numeric:tabular-nums}

/* ---------- filter ---------- */
.filter-bar{display:flex;flex-wrap:wrap;gap:8px}
.filter-btn{
  padding:7px 14px;font-size:12px;font-weight:700;letter-spacing:.08em;
  color:var(--muted);background:var(--steel);border:1px solid var(--line);
  cursor:pointer;
  clip-path:polygon(8px 0,100% 0,100% 100%,0 100%,0 8px);
  transition:color .14s var(--ease),background .14s var(--ease),transform .14s var(--ease);
}
.filter-btn:hover{color:var(--white);transform:translate(2px,-2px)}
.filter-btn[aria-pressed="true"]{background:var(--orange);color:#0A0C0E}
.filter-empty{
  display:none;padding:20px;font-size:14px;color:var(--muted);
  border:1px dashed var(--line);
}
.filter-empty[data-visible="true"]{display:block}
[data-filter-item][hidden]{display:none}

/* ---------- prose ---------- */
.prose{max-width:70ch}
.prose p{font-size:16px;line-height:1.75;color:#D7DDE2;margin-bottom:12px}
.prose h2{
  position:relative;font-size:clamp(22px,3vw,28px);
  margin:28px 0 12px;padding-left:14px;
}
.prose h2::before{content:"";position:absolute;left:0;top:.28em;width:4px;height:.9em;background:var(--orange)}
.prose ul{display:grid;gap:8px;margin:12px 0}
.prose ul li{position:relative;padding-left:16px;color:#D7DDE2}
.prose ul li::before{content:"";position:absolute;left:0;top:.72em;width:8px;height:1px;background:var(--orange)}
.prose a{color:var(--white);text-decoration:none;border-bottom:1px solid var(--orange)}

/* ---------- reveal ---------- */
.js-reveal [data-reveal]{
  opacity:0;transform:translateY(8px);
  transition:opacity .12s var(--ease),transform .12s var(--ease);
}
.js-reveal [data-reveal].is-in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1180px){
  .rail{display:none}
}
@media (max-width:1080px){
  .nav-link{padding:10px 9px;font-size:13px}
  .nav-link::after{left:9px;right:9px}
}
@media (max-width:1024px){
  .grid--thirds{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:900px){
  :root{--header-h:58px;--header-h-sm:52px}
  .brand-ver{display:none}
  .header-cta{display:none}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:fixed;left:0;right:0;top:var(--header-h);bottom:0;z-index:1;
    margin:0;padding:8px var(--pad) 96px;
    background:var(--ink);border-top:1px solid var(--line);
    overflow-y:auto;
    opacity:0;visibility:hidden;transform:translateY(-8px);
    transition:opacity .16s var(--ease),transform .16s var(--ease),visibility .16s var(--ease);
  }
  .site-header[data-scrolled="true"] .site-nav{top:var(--header-h-sm)}
  .site-header[data-open] .site-nav{opacity:1;visibility:visible;transform:none}
  .nav-list{display:block}
  .nav-item{border-bottom:1px solid var(--line)}
  .nav-link{
    display:flex;align-items:baseline;gap:14px;
    padding:18px 0;font-size:21px;font-weight:700;color:var(--white);
  }
  .nav-link::before{
    content:counter(navitem,decimal-leading-zero);
    font-family:var(--mono);font-size:12px;font-weight:500;
    color:var(--orange);letter-spacing:.04em;
  }
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{color:var(--lime)}
  .dock{
    display:grid;grid-template-columns:repeat(3,1fr);
    position:fixed;left:0;right:0;bottom:0;z-index:88;
    background:rgba(10,12,14,.97);
    border-top:1px solid var(--line);
    padding-bottom:env(safe-area-inset-bottom,0px);
  }
  .site-header[data-open] ~ .dock{display:none}
  .grid--aside,.grid--halves,.grid--thirds{grid-template-columns:minmax(0,1fr)}
  .footer-top{grid-template-columns:minmax(0,1fr)}
  .footer-cols{grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
  .footer-base{padding-bottom:calc(22px + 64px + env(safe-area-inset-bottom,0px))}
}
@media (max-width:640px){
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
  .footer-sub{align-items:flex-start}
  .footer-contact{flex-direction:column;gap:8px}
  .fact{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-reveal [data-reveal]{opacity:1;transform:none}
  .rail-link:hover,.btn:hover,.btn-cut:hover,.header-cta:hover,.tag-cut:hover,.filter-btn:hover{transform:none}
}