*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,figcaption,blockquote,dl,dd{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
[id]{scroll-margin-top:calc(var(--header-h) + 24px)}

:root{
  --c-space:#050915;
  --c-tactic:#0B1530;
  --c-panel:#13224A;
  --c-cyan:#22E6FF;
  --c-gold:#FF9A2E;
  --c-violet:#B46CFF;
  --c-green:#6BFFB8;
  --c-text:#EDF5FF;
  --c-muted:#A8BAD8;
  --c-line:#2E4268;
  --c-alert:#FF5C7A;
  --font-display:"Barlow Condensed","Oswald","Noto Sans SC","Source Han Sans SC","PingFang SC",system-ui,sans-serif;
  --font-body:"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;
  --shell:1280px;
  --shell-wide:1440px;
  --gutter:clamp(18px,4vw,48px);
  --header-h:74px;
  --rail-h:34px;
  --cut-sm:9px;
  --cut-md:18px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

body{
  background-color:var(--c-space);
  color:var(--c-text);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
body.is-locked{overflow:hidden}

h1,h2,h3,h4,h5{font-family:var(--font-display);font-weight:800;line-height:1.06;letter-spacing:-.02em;color:var(--c-text)}
h1{font-size:clamp(38px,6vw,64px)}
h2{font-size:clamp(28px,4vw,44px)}
h3{font-size:clamp(20px,2.4vw,30px);line-height:1.2}
h4{font-size:clamp(17px,1.6vw,22px);line-height:1.3;letter-spacing:0}
p{max-width:68ch}
strong,b{font-weight:700;color:#fff}

.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.shell--wide{max-width:var(--shell-wide)}
.main-offset{padding-top:calc(var(--rail-h) + var(--header-h))}

.eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-mono);font-size:11.5px;font-weight:500;letter-spacing:.24em;text-transform:uppercase;color:var(--c-cyan)}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--c-cyan);display:block;flex:none}
.label-mono{font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--c-muted)}
.rule{height:1px;border:0;background:linear-gradient(90deg,var(--c-line),rgba(46,66,104,0))}
.grid-field{position:absolute;inset:0;pointer-events:none;opacity:.55;background-image:linear-gradient(rgba(46,66,104,.35) 1px,transparent 1px),linear-gradient(90deg,rgba(46,66,104,.35) 1px,transparent 1px);background-size:64px 64px;-webkit-mask-image:radial-gradient(ellipse at 50% 0%,#000 0%,transparent 75%);mask-image:radial-gradient(ellipse at 50% 0%,#000 0%,transparent 75%)}

.tag{display:inline-flex;align-items:center;gap:6px;padding:3px 9px;border:1px solid currentColor;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--c-violet)}
.tag--cyan{color:var(--c-cyan)}
.tag--gold{color:var(--c-gold)}
.tag--green{color:var(--c-green)}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:14px 24px;font-family:var(--font-body);font-size:15px;font-weight:700;letter-spacing:.02em;line-height:1.2;border:1px solid transparent;cursor:pointer;clip-path:polygon(0 0,100% 0,100% calc(100% - var(--cut-sm)),calc(100% - var(--cut-sm)) 100%,0 100%);transition:transform .18s var(--ease),background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),box-shadow .18s var(--ease)}
.btn--cyan{background:var(--c-cyan);color:#03121B;box-shadow:0 0 0 1px rgba(34,230,255,.4)}
.btn--cyan:hover{transform:translate(-2px,-2px);box-shadow:6px 6px 0 rgba(34,230,255,.22)}
.btn--ghost{background:rgba(19,34,74,.45);border-color:var(--c-line);color:var(--c-text)}
.btn--ghost:hover{border-color:var(--c-cyan);color:var(--c-cyan);transform:translate(-2px,-2px)}
.btn--gold{background:transparent;border-color:rgba(255,154,46,.55);color:var(--c-gold)}
.btn--gold:hover{background:rgba(255,154,46,.12);transform:translate(-2px,-2px)}

.chip{display:inline-flex;align-items:center;gap:8px;padding:9px 15px;font-family:var(--font-mono);font-size:12px;font-weight:500;letter-spacing:.1em;border:1px solid var(--c-line);background:rgba(19,34,74,.5);color:var(--c-text);white-space:nowrap;clip-path:polygon(0 0,100% 0,100% calc(100% - var(--cut-sm)),calc(100% - var(--cut-sm)) 100%,0 100%);transition:transform .18s var(--ease),background-color .18s var(--ease),border-color .18s var(--ease)}
.chip--cyan{color:var(--c-cyan);border-color:rgba(34,230,255,.45)}
.chip--gold{color:var(--c-gold);border-color:rgba(255,154,46,.4)}
.chip:hover{transform:translate(-1px,-2px);background:rgba(34,230,255,.1);border-color:rgba(34,230,255,.7)}

.sheet{position:relative;background:linear-gradient(155deg,var(--c-tactic),#0A1229 72%);border:1px solid var(--c-line);padding:clamp(20px,3vw,28px);clip-path:polygon(0 0,100% 0,100% calc(100% - var(--cut-md)),calc(100% - var(--cut-md)) 100%,0 100%)}
.sheet::before{content:"";position:absolute;inset:6px;border:1px solid rgba(46,66,104,.45);pointer-events:none}
.sheet--cyan{border-color:rgba(34,230,255,.4)}
.sheet--gold{border-color:rgba(255,154,46,.4)}

.media-frame{position:relative;overflow:hidden;border:1px solid var(--c-line);background:linear-gradient(150deg,var(--c-tactic),var(--c-panel));clip-path:polygon(0 0,100% 0,100% calc(100% - var(--cut-md)),calc(100% - var(--cut-md)) 100%,0 100%)}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame::after{content:"";position:absolute;inset:0;pointer-events:none;background:linear-gradient(180deg,rgba(5,9,21,0) 55%,rgba(5,9,21,.78) 100%)}
.media-frame--21x9{aspect-ratio:21/9}
.media-frame--16x9{aspect-ratio:16/9}
.media-frame--4x3{aspect-ratio:4/3}
.media-frame--1x1{aspect-ratio:1/1}
.media-caption{margin-top:10px;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--c-muted)}

.breadcrumb{font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;color:var(--c-muted)}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb li{display:flex;align-items:center;gap:8px}
.breadcrumb li+li::before{content:"/";color:var(--c-line)}
.breadcrumb a{color:var(--c-muted)}
.breadcrumb a:hover{color:var(--c-cyan)}
.breadcrumb [aria-current="page"]{color:var(--c-text)}

.chapter-index{display:grid;gap:4px;font-family:var(--font-mono)}
.chapter-index--sticky{position:sticky;top:calc(var(--header-h) + 24px)}
.chapter-link{display:grid;grid-template-columns:2.6em 1fr;align-items:baseline;gap:10px;padding:8px 10px;border-left:2px solid transparent;font-size:13px;letter-spacing:.06em;color:var(--c-muted);transition:color .18s var(--ease),background-color .18s var(--ease),border-color .18s var(--ease)}
.chapter-link:hover{color:var(--c-text);background:rgba(19,34,74,.65)}
.chapter-link[aria-current="true"]{color:var(--c-cyan);border-left-color:var(--c-cyan);background:rgba(34,230,255,.08)}
.chapter-num{font-size:11px;letter-spacing:.16em;color:var(--c-violet)}
.chapter-link[aria-current="true"] .chapter-num{color:var(--c-cyan)}

/* ============ Header ============ */
.site-header{position:fixed;inset:0 0 auto;z-index:100;color:var(--c-text);transition:background-color .3s var(--ease),box-shadow .3s var(--ease)}
.site-header[data-solid],.site-header[data-open]{background:rgba(5,9,21,.95);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);box-shadow:0 1px 0 rgba(46,66,104,.9),0 24px 60px -42px #000}

.skip-link{position:absolute;left:var(--gutter);top:-120px;z-index:210;padding:12px 18px;background:var(--c-cyan);color:#03121B;font-family:var(--font-mono);font-size:13px;font-weight:600;letter-spacing:.08em;clip-path:polygon(0 0,100% 0,100% calc(100% - var(--cut-sm)),calc(100% - var(--cut-sm)) 100%,0 100%);transition:top .2s var(--ease)}
.skip-link:focus{top:10px}

.header-rail{max-height:44px;overflow:hidden;background:rgba(11,21,48,.7);border-bottom:1px solid rgba(46,66,104,.55);transition:max-height .3s var(--ease),opacity .22s var(--ease),border-color .3s var(--ease)}
.site-header[data-solid] .header-rail,.site-header[data-open] .header-rail{max-height:0;opacity:0;border-bottom-color:transparent}
.rail-inner{position:relative;display:flex;align-items:center;gap:clamp(10px,2vw,26px);max-width:var(--shell-wide);margin-inline:auto;padding:7px var(--gutter);overflow:hidden;font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--c-muted)}
.rail-tag{color:var(--c-cyan);white-space:nowrap}
.rail-line{flex:1 1 auto;height:1px;background:repeating-linear-gradient(90deg,var(--c-line) 0 6px,transparent 6px 14px)}
.rail-meta{white-space:nowrap}
.rail-meta--alt{display:inline-flex;align-items:center;gap:7px;color:var(--c-green)}
.rail-meta--alt::before{content:"";width:6px;height:6px;background:var(--c-green);border-radius:50%;box-shadow:0 0 8px var(--c-green);flex:none}
.rail-sweep{position:absolute;top:0;bottom:0;left:0;width:110px;pointer-events:none;background:linear-gradient(90deg,transparent,rgba(34,230,255,.2),transparent);animation:rail-sweep 9s linear infinite}
@keyframes rail-sweep{0%{transform:translateX(-120px)}100%{transform:translateX(100vw)}}

.header-bar{position:relative;z-index:95;border-bottom:1px solid transparent;transition:border-color .3s var(--ease),background-color .3s var(--ease)}
.site-header[data-solid] .header-bar{border-bottom-color:rgba(46,66,104,.8)}
.site-header[data-open] .header-bar{background:linear-gradient(180deg,rgba(5,9,21,.98),rgba(5,9,21,.7))}
.header-inner{display:flex;align-items:center;gap:clamp(12px,2vw,30px);max-width:var(--shell-wide);margin-inline:auto;padding-inline:var(--gutter);min-height:var(--header-h)}

.brand{display:inline-flex;align-items:center;gap:12px;flex:none}
.brand-mark{position:relative;width:42px;height:42px;flex:none;background:linear-gradient(140deg,var(--c-cyan) 0%,var(--c-violet) 100%);clip-path:polygon(0 0,100% 0,100% 70%,70% 100%,0 100%);transition:transform .25s var(--ease)}
.brand-mark::before{content:"";position:absolute;inset:3px;background:var(--c-space);clip-path:polygon(0 0,100% 0,100% 70%,70% 100%,0 100%)}
.brand-mark::after{content:"";position:absolute;left:11px;top:12px;width:20px;height:4px;background:var(--c-cyan);transform:rotate(-40deg);box-shadow:-8px 12px 0 -1px var(--c-gold)}
.brand:hover .brand-mark{transform:rotate(-4deg) translateY(-1px)}
.brand-text{display:flex;flex-direction:column;gap:1px;line-height:1.1}
.brand-name{font-family:var(--font-display);font-size:19px;font-weight:800;letter-spacing:-.01em;color:var(--c-text)}
.brand-sub{font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;text-transform:uppercase;color:var(--c-muted)}
.brand--footer .brand-mark{width:48px;height:48px}
.brand--footer .brand-name{font-size:22px}

.primary-nav{margin-left:auto}
.nav-list{display:flex;align-items:center;gap:clamp(8px,1.4vw,22px)}
.nav-link{position:relative;display:inline-flex;flex-direction:column;gap:1px;padding:10px 2px;font-size:14.5px;font-weight:600;letter-spacing:.02em;color:var(--c-text);transition:color .2s var(--ease)}
.nav-index{font-family:var(--font-mono);font-size:10px;font-weight:500;letter-spacing:.18em;color:var(--c-violet);transition:color .2s var(--ease)}
.nav-text{display:inline-block}
.nav-link::after{content:"";position:absolute;left:0;right:0;bottom:3px;height:2px;background:var(--c-cyan);transform:scaleX(0);transform-origin:left center;transition:transform .22s var(--ease)}
.nav-link:hover{color:var(--c-cyan)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--c-cyan)}
.nav-link[aria-current="page"]::after{transform:scaleX(1)}
.nav-link[aria-current="page"] .nav-index{color:var(--c-cyan)}
.nav-panel{display:none}
.nav-panel-note{font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--c-muted);margin-bottom:14px;max-width:none}

.header-actions{display:flex;align-items:center;gap:10px;margin-left:4px}
.nav-toggle{display:none;align-items:center;gap:9px;margin-left:auto;padding:10px 13px;border:1px solid var(--c-line);background:rgba(19,34,74,.6);color:var(--c-text);font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;cursor:pointer;clip-path:polygon(0 0,100% 0,100% calc(100% - var(--cut-sm)),calc(100% - var(--cut-sm)) 100%,0 100%)}
.nav-toggle:hover{border-color:var(--c-cyan);color:var(--c-cyan)}
.nav-toggle-bars{display:grid;gap:4px;width:18px}
.nav-toggle-bars span{display:block;height:2px;background:var(--c-cyan);transition:transform .2s var(--ease)}
.site-header[data-open] .nav-toggle-bars span:first-child{transform:translateY(3px) rotate(45deg)}
.site-header[data-open] .nav-toggle-bars span:last-child{transform:translateY(-3px) rotate(-45deg)}

.scroll-progress{position:absolute;left:0;right:0;bottom:0;height:2px;overflow:hidden;background:rgba(46,66,104,.45)}
.progress-fill{display:block;width:100%;height:100%;transform:scaleX(0);transform-origin:0 50%;background:linear-gradient(90deg,var(--c-cyan),var(--c-violet) 55%,var(--c-gold))}

/* ============ Footer ============ */
.site-footer{position:relative;margin-top:clamp(64px,9vw,120px);overflow:hidden;border-top:1px solid var(--c-line);background:linear-gradient(180deg,var(--c-space) 0%,var(--c-tactic) 58%,#071026 100%);color:var(--c-text)}
.footer-scan{position:absolute;inset:0 0 auto;height:2px;background:linear-gradient(90deg,var(--c-cyan),var(--c-violet) 45%,var(--c-gold))}
.footer-ghost{position:absolute;left:50%;bottom:-.16em;z-index:0;max-width:none;transform:translateX(-50%);font-family:var(--font-display);font-size:clamp(72px,17vw,220px);font-weight:800;line-height:.8;letter-spacing:-.04em;color:rgba(46,66,104,.24);white-space:nowrap;pointer-events:none;user-select:none}
.footer-inner{position:relative;z-index:1;max-width:var(--shell);margin-inline:auto;padding:clamp(44px,7vw,84px) var(--gutter) 26px}
.footer-top{display:grid;grid-template-columns:minmax(240px,1.15fr) minmax(0,1.6fr) minmax(230px,1fr);gap:clamp(26px,4vw,56px)}
.footer-tag{margin-top:18px;font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--c-cyan);max-width:32ch}
.footer-note{margin-top:12px;font-size:13px;line-height:1.7;color:var(--c-muted);max-width:34ch}
.footer-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(18px,3vw,32px)}
.footer-col-title{display:flex;align-items:center;gap:8px;margin-bottom:16px;font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.22em;text-transform:uppercase;color:var(--c-muted)}
.footer-col-title::before{content:"";width:6px;height:6px;flex:none;background:var(--c-cyan);transform:rotate(45deg)}
.footer-list{display:grid;gap:10px}
.footer-link{position:relative;display:inline-block;padding-left:15px;font-size:14.5px;color:var(--c-text);transition:color .18s var(--ease),transform .18s var(--ease)}
.footer-link::before{content:"›";position:absolute;left:0;color:var(--c-violet)}
.footer-link:hover{color:var(--c-cyan);transform:translateX(3px)}
.contact-list{display:grid;gap:14px}
.contact-row{display:grid;gap:2px}
.contact-key{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--c-violet)}
.contact-val{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:14px;line-height:1.6;color:var(--c-text);word-break:break-word}
.copy-btn{display:inline-flex;align-items:center;padding:3px 8px;border:1px solid rgba(46,66,104,.9);background:transparent;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--c-muted);cursor:pointer;transition:color .18s var(--ease),border-color .18s var(--ease)}
.copy-btn:hover{color:var(--c-cyan);border-color:rgba(34,230,255,.6)}
.copy-btn[data-copied="ok"]{color:var(--c-green);border-color:rgba(107,255,184,.6)}
.copy-btn[data-copied="fail"]{color:var(--c-alert);border-color:rgba(255,92,122,.6)}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px;margin-top:clamp(30px,5vw,54px);padding-top:18px;border-top:1px solid rgba(46,66,104,.6);font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;color:var(--c-muted)}
.footer-legal{display:flex;flex-wrap:wrap;align-items:center;gap:6px 18px;max-width:none}
.footer-icp{color:var(--c-muted)}
.footer-copy{color:var(--c-muted)}
.to-top{display:inline-flex;align-items:center;gap:8px;padding:9px 14px;border:1px solid var(--c-line);background:rgba(19,34,74,.7);color:var(--c-text);font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;cursor:pointer;clip-path:polygon(0 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%);transition:transform .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease)}
.to-top:hover{color:var(--c-cyan);border-color:rgba(34,230,255,.6);transform:translateY(-2px)}
.to-top-arrow{color:var(--c-gold)}

:focus-visible{outline:2px solid var(--c-cyan);outline-offset:3px}
.skip-link:focus-visible{outline-color:#03121B}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  .rail-sweep{display:none}
}

/* ============ Responsive ============ */
@media (max-width:1180px){
  .header-actions .chip--gold{display:none}
}
@media (max-width:1024px){
  .footer-top{grid-template-columns:1fr 1fr;gap:34px}
  .footer-brand{grid-column:1 / -1}
}
@media (max-width:1000px){
  :root{--header-h:64px}
  .nav-toggle{display:inline-flex}
  .header-actions{display:none}
  .primary-nav{position:fixed;inset:0;z-index:90;display:block;margin:0;padding:calc(var(--header-h) + 28px) var(--gutter) 44px;overflow-y:auto;background:radial-gradient(120% 80% at 100% 0%,rgba(34,230,255,.14),transparent 60%),linear-gradient(165deg,#050915 0%,#0B1530 62%,#13224A 100%);clip-path:polygon(0 0,100% 0,100% 93%,0 100%);opacity:0;visibility:hidden;pointer-events:none;transform:translateY(-10px);transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s}
  .site-header[data-open] .primary-nav{opacity:1;visibility:visible;pointer-events:auto;transform:none}
  .nav-list{display:block}
  .nav-item{border-bottom:1px solid rgba(46,66,104,.55)}
  .nav-link{flex-direction:row;align-items:baseline;gap:14px;padding:16px 2px;font-family:var(--font-display);font-size:22px;font-weight:800;letter-spacing:-.01em}
  .nav-index{font-size:12px}
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{color:var(--c-cyan)}
  .nav-panel{display:grid;gap:10px;margin-top:28px}
  .nav-panel .btn{width:100%}
}
@media (max-width:760px){
  .brand-sub{display:none}
  .rail-meta:nth-of-type(2){display:none}
  .footer-nav{grid-template-columns:1fr 1fr}
  .footer-bottom{align-items:flex-start}
}
@media (max-width:560px){
  .footer-top{grid-template-columns:1fr}
  .footer-nav{grid-template-columns:1fr}
  .rail-meta:nth-of-type(1){display:none}
  .footer-ghost{font-size:clamp(60px,22vw,120px)}
}