:root{
  --ink:#071A14;
  --panel:#0C2A20;
  --panel-2:#0F342A;
  --cyan:#35E0D0;
  --mist:#8FF3E8;
  --amber:#F2B23E;
  --cream:#F4F1E8;
  --red:#E5484D;
  --yellow:#F5C542;
  --sage:#5E7A70;
  --line:#17453A;
  --line-soft:rgba(94,122,112,.32);
  --deep-a:#0E3B2E;
  --deep-b:#123F4A;
  --grad-deep:linear-gradient(135deg,var(--deep-a) 0%,var(--deep-b) 100%);
  --shadow-hard:6px 6px 0 0 rgba(0,0,0,.45);
  --shadow-cyan:6px 6px 0 0 rgba(53,224,208,.3);
  --font-display:-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  --font-mono:ui-monospace,"SF Mono",SFMono-Regular,Menlo,Consolas,"PingFang SC",monospace;
  --maxw:1280px;
  --pad:clamp(1rem,3vw,2.5rem);
  --radius:2px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  min-height:100vh;
  background:
    radial-gradient(circle at 84% -10%,rgba(53,224,208,.13),transparent 46%),
    radial-gradient(circle at -8% 14%,rgba(242,178,62,.09),transparent 42%),
    var(--ink);
  color:var(--cream);
  font-family:var(--font-display);
  font-size:clamp(16px,.38vw + 15px,18px);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:repeating-linear-gradient(0deg,rgba(143,243,232,.045) 0 1px,transparent 1px 4px);
  opacity:.55;
}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0}
h1,h2,h3,h4,h5,h6{
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.14;
  letter-spacing:-.018em;
  text-wrap:balance;
}
p{margin:0 0 1em}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
a{color:var(--cyan);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--mist)}
:focus-visible{outline:2px solid var(--amber);outline-offset:3px}
#main-content{display:block}
#main-content:focus{outline:none}
.sr-only{
  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;border:0;
}
.wrap{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--pad);
}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(.9rem,2vw,1.6rem)}
.col-3,.col-4,.col-5,.col-6,.col-7,.col-8,.col-12{grid-column:span 12}
.prose{max-width:38em}
.prose p:last-child{margin-bottom:0}

/* ---------- header ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  isolation:isolate;
  background:linear-gradient(180deg,rgba(12,42,32,.985),rgba(8,32,26,.985));
  border-bottom:2px solid var(--line);
  color:var(--cream);
}
.site-header__inner{
  display:flex;
  align-items:center;
  gap:clamp(.6rem,1.6vw,1.5rem);
  min-height:66px;
  padding-block:.6rem;
}
.scroll-progress{
  position:absolute;
  left:0;bottom:-2px;
  width:100%;height:2px;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--amber));
  box-shadow:0 0 10px rgba(53,224,208,.55);
  will-change:transform;
}
.skip-link{
  position:absolute;
  left:var(--pad);
  top:.5rem;
  z-index:99;
  transform:translateY(-320%);
  padding:.65rem 1rem;
  background:var(--cyan);
  color:var(--ink);
  font-weight:700;
  font-size:.9rem;
  text-decoration:none;
  border:2px solid var(--cream);
  transition:transform .18s ease;
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0);color:var(--ink)}
.brand{display:flex;align-items:center;gap:.6rem;text-decoration:none;color:var(--cream);flex:0 0 auto}
.brand:hover{color:var(--cream)}
.brand__index{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:.66rem;
  font-weight:600;
  letter-spacing:.14em;
  color:var(--amber);
  border:1px solid rgba(242,178,62,.45);
  padding:.2rem .38rem;
  line-height:1;
}
.brand__text{display:flex;flex-direction:column;gap:.16rem;line-height:1.05}
.brand__name{font-size:1.06rem;font-weight:800;letter-spacing:.02em}
.brand__line{
  font-family:var(--font-mono);
  font-size:.6rem;
  letter-spacing:.24em;
  color:var(--mist);
  opacity:.78;
}
.site-nav{display:flex;align-items:center;min-width:0}
.site-nav__list{
  display:flex;
  align-items:center;
  gap:.1rem;
  counter-reset:navidx;
  flex-wrap:wrap;
}
.site-nav__item{flex:0 0 auto}
.site-nav__link{
  position:relative;
  display:inline-block;
  padding:.42rem .62rem;
  font-size:.86rem;
  letter-spacing:.03em;
  color:var(--mist);
  text-decoration:none;
  border-bottom:2px solid transparent;
  transition:color .16s ease,background .16s ease,border-color .16s ease;
}
.site-nav__link::before{
  counter-increment:navidx;
  content:counter(navidx,decimal-leading-zero);
  font-family:var(--font-mono);
  font-size:.56rem;
  letter-spacing:.06em;
  color:var(--sage);
  margin-right:.35rem;
  vertical-align:.45em;
}
.site-nav__link:hover,.site-nav__link:focus-visible{
  color:var(--cream);
  border-bottom-color:rgba(53,224,208,.55);
}
.site-nav__link[aria-current="page"]{
  background:var(--cyan);
  color:var(--ink);
  border-bottom-color:var(--cyan);
  font-weight:700;
}
.site-nav__link[aria-current="page"]::before{color:rgba(7,26,20,.62)}
.site-nav__foot{
  display:none;
  margin:0;
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.16em;
  color:var(--sage);
}
.header-actions{display:flex;align-items:center;gap:.7rem;margin-left:auto;flex:0 0 auto}
.header-status{display:flex;align-items:center;gap:.42rem;margin:0}
.header-status__text{
  font-family:var(--font-mono);
  font-size:.64rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--mist);
  opacity:.85;
}
.header-status__dot{
  width:7px;height:7px;
  border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 0 0 rgba(53,224,208,.6);
  animation:dotPulse 2.8s ease-out infinite;
}
@keyframes dotPulse{
  0%{box-shadow:0 0 0 0 rgba(53,224,208,.55)}
  70%{box-shadow:0 0 0 8px rgba(53,224,208,0)}
  100%{box-shadow:0 0 0 0 rgba(53,224,208,0)}
}
.nav-toggle{
  display:none;
  position:relative;
  width:44px;height:44px;
  padding:0;
  background:transparent;
  border:2px solid var(--cyan);
  border-radius:var(--radius);
  cursor:pointer;
}
.nav-toggle__bars,
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  position:absolute;
  left:50%;
  width:18px;height:2px;
  background:var(--cyan);
  transform:translateX(-50%);
  transition:transform .18s ease,opacity .18s ease,background .18s ease;
}
.nav-toggle__bars{top:50%;margin-top:-1px}
.nav-toggle__bars::before{content:"";top:-6px}
.nav-toggle__bars::after{content:"";top:6px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:0;transform:translateX(-50%) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{top:0;transform:translateX(-50%) rotate(-45deg)}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  z-index:1;
  margin-top:clamp(3rem,7vw,6rem);
  background:linear-gradient(180deg,rgba(8,32,26,.96),rgba(5,19,14,.99));
  border-top:2px solid var(--line);
  color:var(--cream);
}
.site-footer__inner{padding-block:clamp(2.4rem,5vw,4rem) 2rem}
.footer-top{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:1.5rem;
  flex-wrap:wrap;
  padding-bottom:1.6rem;
  border-bottom:1px dashed var(--line-soft);
}
.footer-brand__mark{
  margin:0;
  font-size:clamp(1.9rem,5.2vw,3.4rem);
  font-weight:800;
  letter-spacing:-.03em;
  line-height:1;
  color:var(--cream);
}
.footer-brand__meta{
  margin:.6rem 0 0;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.2em;
  color:var(--mist);
  opacity:.8;
}
.footer-scan{
  margin:0;
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.34em;
  color:var(--sage);
  text-transform:uppercase;
}
.footer-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(1.4rem,3vw,2.4rem);
  padding-block:clamp(1.8rem,4vw,2.6rem);
}
.footer-col{min-width:0}
.footer-col__title{
  margin:0 0 .9rem;
  font-family:var(--font-mono);
  font-size:.68rem;
  font-weight:600;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--cyan);
}
.footer-list{display:flex;flex-direction:column;gap:.45rem}
.footer-list__item{display:block}
.footer-link{
  display:inline-block;
  color:var(--cream);
  font-size:.94rem;
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .16s ease,border-color .16s ease;
}
.footer-link:hover,.footer-link:focus-visible{color:var(--cyan);border-bottom-color:var(--cyan)}
.footer-col--contact .footer-contact__line{
  margin:0 0 .55rem;
  font-size:.9rem;
  color:var(--mist);
  word-break:break-word;
}
.footer-col--contact .footer-contact__line:last-child{margin-bottom:0}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5rem 1.5rem;
  padding-top:1.4rem;
  border-top:2px solid var(--line);
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.1em;
  color:var(--sage);
}
.footer-legal{margin:0;color:var(--amber);letter-spacing:.14em}
.footer-note{margin:0;flex:1 1 16rem;line-height:1.6}
.footer-copy{margin:0;margin-left:auto}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.45rem;
  padding:.72rem 1.1rem;
  border:2px solid var(--cyan);
  border-radius:var(--radius);
  background:transparent;
  color:var(--cyan);
  font-size:.86rem;
  font-weight:700;
  letter-spacing:.04em;
  line-height:1;
  text-decoration:none;
  cursor:pointer;
  transition:transform .18s ease,box-shadow .18s ease,background .18s ease,color .18s ease,border-color .18s ease;
}
.btn:hover{color:var(--ink);background:var(--mist);border-color:var(--mist)}
.btn--primary{
  background:var(--cyan);
  color:var(--ink);
  box-shadow:5px 5px 0 0 rgba(53,224,208,.22);
}
.btn--primary:hover{
  background:var(--mist);
  color:var(--ink);
  transform:translate(-2px,-2px);
  box-shadow:7px 7px 0 0 rgba(53,224,208,.32);
}
.btn--ghost{
  background:transparent;
  color:var(--cream);
  border-color:var(--line-soft);
  box-shadow:none;
}
.btn--ghost:hover{background:transparent;border-color:var(--cyan);color:var(--cyan)}
.header-cta{font-size:.8rem;padding:.62rem .9rem}

/* ---------- shared building blocks ---------- */
.eyebrow{
  display:block;
  margin:0 0 .7rem;
  font-family:var(--font-mono);
  font-size:.66rem;
  font-weight:600;
  letter-spacing:.26em;
  text-transform:uppercase;
  color:var(--cyan);
}
.chapter-num{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:.72rem;
  font-weight:600;
  letter-spacing:.3em;
  color:var(--amber);
}
.rule{height:2px;border:0;margin:clamp(1.5rem,4vw,2.6rem) 0;background:linear-gradient(90deg,var(--line),transparent)}
.breadcrumbs{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.12em}
.breadcrumbs ol,.breadcrumbs__list{display:flex;flex-wrap:wrap;align-items:center;gap:.45rem}
.breadcrumbs__item{display:flex;align-items:center;gap:.45rem;color:var(--sage)}
.breadcrumbs__item + .breadcrumbs__item::before{content:"/";color:var(--line-soft)}
.breadcrumbs__link{color:var(--mist);text-decoration:none}
.breadcrumbs__link:hover,.breadcrumbs__link:focus-visible{color:var(--cyan);text-decoration:underline}
.breadcrumbs__current{color:var(--cream)}
.card{
  position:relative;
  padding:clamp(1.1rem,2.6vw,1.8rem);
  background:var(--panel);
  border:2px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow-hard);
}
.card--accent{border-color:rgba(53,224,208,.5);box-shadow:var(--shadow-cyan)}
.card__title{margin:0 0 .6rem;font-size:clamp(1.05rem,2vw,1.3rem);letter-spacing:-.01em}
.tag{
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  padding:.2rem .5rem;
  border:1px solid var(--line-soft);
  border-radius:var(--radius);
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--mist);
  background:rgba(12,42,32,.6);
}
.tag--cyan{color:var(--ink);background:var(--cyan);border-color:var(--cyan)}
.tag--amber{color:var(--ink);background:var(--amber);border-color:var(--amber)}
.tag--red{color:var(--red);border-color:rgba(229,72,77,.55);background:rgba(229,72,77,.1)}
.tag--yellow{color:var(--yellow);border-color:rgba(245,197,66,.55);background:rgba(245,197,66,.1)}
.data-table{
  width:100%;
  border-collapse:collapse;
  font-size:.92rem;
  background:rgba(7,26,20,.35);
}
.data-table caption{
  padding-bottom:.6rem;
  text-align:left;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.18em;
  color:var(--sage);
}
.data-table th,.data-table td{
  padding:.65rem .8rem;
  border:1px solid var(--line);
  text-align:left;
  vertical-align:top;
}
.data-table thead th{
  background:var(--panel-2);
  color:var(--mist);
  font-family:var(--font-mono);
  font-size:.7rem;
  font-weight:600;
  letter-spacing:.12em;
  text-transform:uppercase;
}
.data-table tbody tr:nth-child(even){background:rgba(12,42,32,.5)}
.data-table__key{
  font-family:var(--font-mono);
  font-weight:600;
  color:var(--amber);
  letter-spacing:.04em;
}
.timeline{
  overflow-x:auto;
  padding-bottom:.5rem;
  scrollbar-width:thin;
  scrollbar-color:var(--line) transparent;
}
.timeline__track{display:flex;gap:.55rem;padding:.25rem;min-width:max-content}
.timeline__node{
  flex:0 0 auto;
  min-width:90px;
  padding:.6rem .8rem;
  background:var(--panel);
  border:2px solid var(--line);
  border-radius:var(--radius);
  font-family:var(--font-mono);
  font-size:.76rem;
  letter-spacing:.08em;
  text-align:center;
  color:var(--mist);
}
.timeline__node--current{
  background:var(--cyan);
  border-color:var(--cyan);
  color:var(--ink);
  font-weight:700;
  box-shadow:4px 4px 0 0 rgba(53,224,208,.3);
  animation:nodePulse 2.4s ease-out 1;
}
@keyframes nodePulse{
  0%{box-shadow:4px 4px 0 0 rgba(53,224,208,.3),0 0 0 0 rgba(53,224,208,.5)}
  100%{box-shadow:4px 4px 0 0 rgba(53,224,208,.3),0 0 0 14px rgba(53,224,208,0)}
}
.media-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16/10;
  background:var(--grad-deep);
  border:2px solid var(--line);
  border-radius:var(--radius);
}
.media-frame img{
  width:100%;height:100%;
  object-fit:cover;
  display:block;
}
.media-frame::before{
  content:"";
  position:absolute;inset:0;
  z-index:1;
  pointer-events:none;
  background-image:repeating-linear-gradient(0deg,rgba(7,26,20,.22) 0 1px,transparent 1px 4px);
}
.media-frame::after{
  content:"";
  position:absolute;inset:0;
  z-index:2;
  pointer-events:none;
  background:linear-gradient(180deg,rgba(7,26,20,0) 42%,rgba(7,26,20,.72) 100%);
}
.media-frame--slant{clip-path:polygon(0 0,100% 0,100% 88%,0 100%)}
.media-frame--tall{aspect-ratio:3/4}
.filter-bar{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem}
.filter-btn{
  padding:.46rem .82rem;
  background:transparent;
  border:2px solid var(--line-soft);
  border-radius:var(--radius);
  color:var(--mist);
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.12em;
  text-transform:uppercase;
  cursor:pointer;
  transition:background .18s ease,color .18s ease,border-color .18s ease,transform .18s ease;
}
.filter-btn:hover{border-color:var(--cyan);color:var(--cyan)}
.filter-btn[aria-pressed="true"]{
  background:var(--cyan);
  border-color:var(--cyan);
  color:var(--ink);
  font-weight:700;
}
.filter-count{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.12em;
  color:var(--amber);
}
.filter-empty{
  margin:.9rem 0 0;
  padding:.85rem 1rem;
  border:2px dashed var(--line-soft);
  border-radius:var(--radius);
  font-family:var(--font-mono);
  font-size:.78rem;
  letter-spacing:.08em;
  color:var(--sage);
}
[data-filter-item][hidden]{display:none}

/* ---------- responsive ---------- */
@media (max-width:1150px){
  .header-status{display:none}
}
@media (max-width:1024px){
  .nav-toggle{display:inline-block}
  .header-cta{display:none}
  .site-header__inner{flex-wrap:nowrap}
  .site-nav{
    display:none;
    position:absolute;
    left:0;right:0;top:100%;
    z-index:70;
    padding:.6rem var(--pad) 1.1rem;
    background:linear-gradient(180deg,var(--panel),#08201A);
    border-top:2px solid var(--line);
    border-bottom:2px solid var(--line);
    box-shadow:0 22px 34px -20px rgba(0,0,0,.95);
  }
  .site-nav[data-open="true"]{display:block}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .site-nav__item{width:100%}
  .site-nav__link{
    display:block;
    width:100%;
    padding:.72rem .4rem;
    font-size:.98rem;
    border-bottom:1px solid rgba(94,122,112,.22);
    border-left:2px solid transparent;
  }
  .site-nav__link:hover{border-bottom-color:rgba(94,122,112,.22);border-left-color:var(--cyan)}
  .site-nav__link[aria-current="page"]{border-bottom-color:var(--cyan);border-left-color:var(--cyan)}
  .site-nav__foot{
    display:block;
    margin-top:.85rem;
    padding-top:.7rem;
    border-top:1px dashed var(--line-soft);
  }
}
@media (min-width:760px){
  .col-4{grid-column:span 6}
  .col-6{grid-column:span 6}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-col--contact{grid-column:span 2}
}
@media (min-width:1024px){
  .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-12{grid-column:span 12}
  .footer-grid{grid-template-columns:1.1fr 1.1fr 1.5fr}
  .footer-col--contact{grid-column:auto}
}
@media (max-width:560px){
  .brand__line{display:none}
  .brand__name{font-size:1rem}
  .site-header__inner{min-height:58px;padding-block:.5rem}
  .footer-scan{display:none}
  .footer-copy{margin-left:0;flex:1 1 100%}
  .btn{font-size:.82rem;padding:.65rem .9rem}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  .header-status__dot{box-shadow:none}
  .timeline__node--current{animation:none}
  .btn--primary:hover{transform:none}
  .skip-link{transition:none}
}