:root{
  --main:#0A1F44;
  --accent:#FF6B35;
  --paper:#F7F3EB;
  --ink:#1A1A1A;
  --silver:#C0C0C0;
  --white:#FFFFFF;
  --data-blue:#3B82F6;
  --trend-green:#10B981;
  --warn-red:#EF4444;
  --gray:#6B7280;
  --body-font:"Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --heading-font:Impact,"Arial Black",sans-serif;
  --mono-font:"Roboto Mono","Courier New",monospace;
  --shadow-hard:5px 5px 0 rgba(10,31,68,.18);
  --shadow-accent:6px 6px 0 rgba(255,107,53,.3);
  --border-hard:3px solid var(--ink);
  --radius-card:0;
  --container:1200px;
  --space-unit:1.25rem;
}
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--body-font);
  line-height:1.6;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:var(--main)}
a:hover{color:var(--accent)}
.skip-link{
  position:absolute;left:-999px;top:0;z-index:2000;
  background:var(--accent);color:var(--white);
  padding:.75rem 1.5rem;text-decoration:none;
  font-family:var(--mono-font);font-size:.875rem;
  transition:top .2s ease;
}
.skip-link:focus{
  left:0;top:0;
  outline:3px solid var(--white);
  outline-offset:-3px;
}
.site-header{
  position:relative;
  padding:1rem 1.25rem 0;
  background:
    linear-gradient(135deg,var(--main) 0%,var(--main) 60%,#0d2b5b 100%);
  border-bottom:4px solid var(--accent);
}
.header-border{
  display:flex;justify-content:space-between;
  max-width:var(--container);margin:0 auto .6rem;
  font-family:var(--mono-font);font-size:.6875rem;
  letter-spacing:.18em;color:rgba(255,255,255,.45);
  border-bottom:1px solid rgba(255,255,255,.14);
  padding-bottom:.5rem;
  text-transform:uppercase;
}
.site-nav{
  position:sticky;
  top:12px;
  z-index:100;
  max-width:var(--container);
  margin:0 auto 1rem;
  display:flex;align-items:center;
  justify-content:space-between;
  gap:1rem;
  background:rgba(10,31,68,.82);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border:1px solid rgba(255,255,255,.14);
  border-radius:999px;
  padding:.55rem .7rem .55rem 1.1rem;
  box-shadow:0 12px 30px rgba(0,0,0,.25);
}
@supports not (backdrop-filter:blur(12px)){
  .site-nav{background:rgba(10,31,68,.95)}
}
.brand{
  display:inline-flex;align-items:center;gap:.6rem;
  text-decoration:none;flex-shrink:0;
}
.brand__shield{
  display:inline-flex;align-items:center;justify-content:center;
  width:38px;height:38px;border-radius:50%;
  background:var(--main);border:2px solid var(--accent);
  transition:transform .2s ease;
}
.brand__shield-bg{fill:var(--main);stroke:var(--accent);stroke-width:2}
.brand__shield-line{stroke:var(--accent);stroke-width:3;fill:none;stroke-linecap:round;stroke-linejoin:round}
.brand__shield-dot{fill:var(--accent)}
.brand:hover .brand__shield{transform:rotate(-8deg) scale(1.05)}
.brand__text{
  display:inline-flex;align-items:baseline;gap:.3rem;
  font-family:var(--heading-font);color:var(--white);
  font-size:1.35rem;letter-spacing:.03em;
}
.brand__text strong{font-weight:normal}
.brand__text em{
  font-style:normal;color:var(--accent);
  font-family:var(--mono-font);font-size:.85rem;
  letter-spacing:.1em;
}
.nav-list{
  display:flex;align-items:center;gap:1rem;
  list-style:none;margin:0;padding:0;
}
.nav-list__link{
  font-family:var(--body-font);font-size:.875rem;font-weight:600;
  color:rgba(255,255,255,.85);text-decoration:none;
  padding:.55rem .95rem;border-radius:999px;
  transition:background .15s ease,color .15s ease;
  position:relative;
}
.nav-list__link:hover{
  color:var(--white);
  background:rgba(255,107,53,.18);
}
.nav-list__link[aria-current="page"]{
  color:var(--main);
  background:var(--accent);
  box-shadow:0 3px 0 rgba(255,255,255,.12);
}
.nav-toggle{
  display:none;
  background:transparent;border:0;cursor:pointer;
  width:42px;height:42px;border-radius:50%;
  flex-direction:column;align-items:center;justify-content:center;
  gap:5px;background:rgba(255,255,255,.08);
  transition:background .15s ease;
}
.nav-toggle:hover{background:rgba(255,255,255,.16)}
.nav-toggle__bar{
  display:block;width:20px;height:2px;background:var(--white);
  border-radius:2px;transition:transform .2s ease,opacity .2s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.site-footer{
  background:var(--ink);
  color:rgba(255,255,255,.75);
  border-top:6px solid var(--main);
}
.trust-strip{
  background:var(--main);
  color:rgba(255,255,255,.9);
  border-bottom:1px solid rgba(255,255,255,.12);
}
.trust-strip__container{
  max-width:var(--container);margin:0 auto;
  display:flex;align-items:center;gap:1.25rem;
  padding:1rem 1.5rem;
  font-size:.85rem;line-height:1.6;
  font-family:var(--mono-font);
}
.trust-strip__badge{
  background:var(--accent);color:var(--main);
  font-weight:700;font-family:var(--heading-font);
  font-size:.8125rem;padding:.3rem .75rem;
  border-radius:3px;letter-spacing:.1em;flex-shrink:0;
}
.footer-grid{
  max-width:var(--container);margin:0 auto;
  display:grid;grid-template-columns:1.4fr 1fr 1.2fr;
  gap:2rem;padding:3rem 1.5rem 2rem;
}
.footer-brand__logo{
  font-family:var(--heading-font);font-size:1.7rem;color:var(--white);
  margin-bottom:.6rem;
}
.footer-brand__logo em{
  font-style:normal;color:var(--accent);
  font-family:var(--mono-font);font-size:1rem;margin-left:.2rem;
}
.footer-brand__desc{font-size:.875rem;color:rgba(255,255,255,.6);max-width:30ch}
.footer-brand__icp{
  margin-top:1rem;font-family:var(--mono-font);font-size:.75rem;
  color:rgba(255,255,255,.4);display:inline-block;
  border:1px solid rgba(255,255,255,.15);padding:.2rem .5rem;
}
.footer-links__title,.footer-meta__title{
  font-family:var(--mono-font);font-size:.75rem;
  letter-spacing:.16em;text-transform:uppercase;
  color:var(--silver);margin-bottom:1rem;
  border-bottom:1px solid rgba(255,255,255,.12);
  padding-bottom:.5rem;
}
.footer-links ul,.footer-meta ul{
  list-style:none;margin:0;padding:0;
  display:flex;flex-direction:column;gap:.4rem;
}
.footer-links a,.footer-meta a{
  color:rgba(255,255,255,.75);text-decoration:none;
  font-size:.875rem;transition:color .15s ease;
}
.footer-links a:hover,.footer-meta a:hover{color:var(--accent)}
.footer-meta__contact,.footer-meta__addr{
  font-size:.8125rem;color:rgba(255,255,255,.5);
  margin-top:.5rem;font-family:var(--mono-font);
}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.12);
  padding:1rem 1.5rem;
  display:flex;flex-wrap:wrap;justify-content:space-between;
  gap:.5rem;max-width:var(--container);margin:0 auto;
  font-size:.75rem;color:rgba(255,255,255,.4);
  font-family:var(--mono-font);
}
.footer-bottom__note{color:rgba(255,255,255,.3)}
/* ---------- base grid ---------- */
.grid-bg{
  background-image:
    linear-gradient(rgba(10,31,68,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(10,31,68,.05) 1px,transparent 1px);
  background-size:32px 32px;
}
.container{
  max-width:var(--container);
  margin-inline:auto;
  padding-inline:1.5rem;
  width:100%;
}
.section-block{
  padding:calc(var(--space-unit)*2) 0;
}
/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  background:var(--main);color:var(--white);
  font-family:var(--body-font);font-weight:600;font-size:.875rem;
  border:2px solid var(--main);border-radius:0;
  padding:.7rem 1.5rem;text-decoration:none;cursor:pointer;
  box-shadow:3px 3px 0 var(--silver);
  transition:background .15s ease,color .15s ease,box-shadow .15s ease;
  margin:.5rem .5rem .5rem 0;
}
.btn:hover{background:var(--accent);border-color:var(--accent);color:var(--main);box-shadow:3px 3px 0 rgba(10,31,68,.25)}
.btn--accent{background:var(--accent);border-color:var(--accent);color:var(--main);box-shadow:3px 3px 0 rgba(10,31,68,.2)}
.btn--accent:hover{background:var(--main);color:var(--white);border-color:var(--main);box-shadow:3px 3px 0 var(--accent)}
.btn--ghost{background:transparent;border-color:var(--main);color:var(--main);box-shadow:none}
.btn--ghost:hover{background:var(--main);color:var(--white);border-color:var(--main);box-shadow:none}
/* ---------- data card ---------- */
.data-card{
  background:var(--white);
  border:var(--border-hard);
  box-shadow:var(--shadow-hard);
  border-radius:var(--radius-card);
  padding:1.25rem;
  margin:1rem 0;
  display:flex;
  flex-direction:column;
}
.data-card--accent{border-color:var(--accent);box-shadow:var(--shadow-accent)}
.data-card__index{
  font-family:var(--mono-font);font-size:.75rem;color:var(--gray);
  letter-spacing:.12em;margin-bottom:.25rem;
}
.data-card__title{
  font-family:var(--heading-font);font-weight:normal;
  font-size:1.25rem;color:var(--main);
  margin-bottom:.5rem;line-height:1.2;
}
.data-card__value{
  font-family:var(--mono-font);font-size:2rem;color:var(--accent);
  line-height:1;font-weight:700;
}
.data-card__meta{font-size:.8125rem;color:var(--gray);margin-top:.75rem}
/* ---------- section index ---------- */
.section-index{
  position:relative;
  padding-left:1.25rem;
  font-size:1.25rem;
  font-weight:700;
  color:var(--main);
  margin-bottom:1.5rem;
  display:flex;align-items:center;gap:.6rem;
}
.section-index::before{
  content:"";
  position:absolute;left:0;width:6px;height:1.6em;
  background:var(--accent);transition:height .2s ease;
}
.section-index__no{
  font-family:var(--mono-font);font-size:.875rem;color:var(--accent);
  background:rgba(255,107,53,.1);border:1px solid rgba(255,107,53,.3);
  padding:.1rem .4rem;border-radius:2px;
}
.section-index.is-active::before{height:2em;background:var(--main)}
/* ---------- reading progress ---------- */
.reading-progress{
  position:fixed;top:0;left:0;height:4px;width:100%;
  background:transparent;z-index:1000;pointer-events:none;
}
.reading-progress__bar{
  height:100%;width:0;
  background:var(--accent);
  box-shadow:0 0 6px rgba(255,107,53,.4);
  transition:width .12s ease-out;
}
/* ---------- tabs ---------- */
.data-tabs__list{
  display:flex;flex-wrap:wrap;gap:.8rem;
  border-bottom:2px solid var(--main);
  padding-bottom:.2rem;margin-bottom:1.5rem;
}
.data-tabs__btn{
  background:transparent;border:2px solid transparent;
  font-family:var(--body-font);font-size:.875rem;font-weight:600;
  color:var(--gray);padding:.5rem 1.1rem;cursor:pointer;
  border-radius:3px;
  transition:color .15s ease,background .15s ease,border-color .15s ease;
}
.data-tabs__btn:hover{color:var(--accent)}
.data-tabs__btn[aria-selected="true"]{
  background:var(--main);color:var(--white);
  border-color:var(--main);
}
.data-tabs__panel{display:block}
.data-tabs__panel[hidden]{display:none}
/* ---------- details ---------- */
.fold-panel{
  background:var(--white);
  border:2px solid var(--ink);
  box-shadow:var(--shadow-hard);
  margin:0 0 1rem;
  border-radius:0;
}
.fold-panel summary{
  list-style:none;cursor:pointer;
  display:flex;align-items:center;gap:.9rem;
  padding:1rem 1.25rem;
  background:rgba(10,31,68,.02);
  font-weight:600;color:var(--main);
  transition:background .15s ease;
}
.fold-panel summary::-webkit-details-marker{display:none}
.fold-panel summary:hover{background:rgba(10,31,68,.06)}
.fold-panel summary::before{
  content:"";
  width:10px;height:10px;flex-shrink:0;
  border-left:2px solid var(--accent);
  border-top:2px solid var(--accent);
  transform:rotate(225deg);
  transition:transform .15s ease;
}
.fold-panel[open] summary::before{transform:rotate(45deg)}
.fold-panel__no{
  font-family:var(--mono-font);font-size:.75rem;
  color:var(--accent);background:rgba(255,107,53,.1);
  padding:.15rem .4rem;border-radius:2px;
}
.fold-panel__content{padding:1rem 1.25rem;border-top:1px solid var(--silver)}
/* ---------- breadcrumb ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;gap:.4rem;
  list-style:none;padding-left:0;margin:0 0 1.5rem;
  font-family:var(--mono-font);font-size:.75rem;
  color:var(--gray);
}
.breadcrumb li:not(:last-child)::after{content:"/";margin-left:.4rem;color:var(--silver)}
.breadcrumb a{color:var(--main);text-decoration:none}
.breadcrumb a:hover{color:var(--accent)}
.breadcrumb li[aria-current]{color:var(--accent);font-weight:700}
/* ---------- prose ---------- */
.prose{
  max-width:760px;
  margin:0 auto;
  font-size:1rem;
  line-height:1.85;
  color:var(--ink);
}
.prose h1,.prose h2,.prose h3{
  font-family:var(--heading-font);font-weight:normal;
  color:var(--main);line-height:1.2;
  margin-top:2rem;margin-bottom:.8rem;
}
.prose h1{font-size:clamp(2rem,5vw,3.2rem);border-bottom:4px solid var(--accent);display:inline-block;padding-bottom:.3rem}
.prose h2{font-size:clamp(1.4rem,3vw,2rem)}
.prose h3{font-size:1.2rem}
.prose p{margin-bottom:1.2rem}
.prose ul,.prose ol{margin:0 0 1.2rem 1.5rem}
.prose li{margin-bottom:.35rem}
.prose strong{color:var(--main)}
.prose blockquote{
  border-left:4px solid var(--accent);
  margin:1.5rem 0;padding:.75rem 1.25rem;
  background:rgba(255,107,53,.05);
  font-style:normal;
}
.prose code{
  font-family:var(--mono-font);background:rgba(10,31,68,.06);
  padding:.15rem .35rem;font-size:.85em;color:var(--main);
}
/* ---------- media frame ---------- */
.media-frame{
  position:relative;
  background:var(--main);
  border:2px solid var(--ink);
  box-shadow:var(--shadow-hard);
  padding:0;
  overflow:hidden;
  min-height:220px;
  display:flex;align-items:center;justify-content:center;
  color:rgba(255,255,255,.35);
  font-family:var(--mono-font);font-size:.75rem;
  letter-spacing:.1em;
  text-transform:uppercase;
}
.media-frame::before{
  content:"IMG // PLACEHOLDER";
  position:absolute;top:8px;left:10px;
  color:var(--accent);opacity:.7;
  font-size:.65rem;
}
.media-frame::after{
  content:"";
  position:absolute;right:10px;bottom:10px;
  width:20px;height:20px;
  border-right:2px solid var(--accent);
  border-bottom:2px solid var(--accent);
}
.media-frame img{
  width:100%;height:100%;object-fit:cover;
  position:absolute;inset:0;
}
.media-frame--wide{min-height:320px}
.media-frame--tall{min-height:460px}
/* ---------- shared utilities ---------- */
.mono{font-family:var(--mono-font)}
.text-accent{color:var(--accent)}
.text-main{color:var(--main)}
.bg-main{background:var(--main);color:var(--white)}
.bg-paper{background:var(--paper)}
.bg-white{background:var(--white)}
.pad-top-2{padding-top:2rem}
.pad-bottom-2{padding-bottom:2rem}
.mt-1{margin-top:1rem}
.mb-1{margin-bottom:1rem}
.d-flex{display:flex;align-items:center}
.flex-wrap{flex-wrap:wrap}
.gap-1{gap:1rem}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:1.5rem}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem}
.flow > *+*{margin-top:var(--space-unit)}
/* ---------- focus visible ---------- */
:focus-visible{
  outline:3px solid var(--accent);
  outline-offset:2px;border-radius:2px;
}
/* ---------- responsive ---------- */
@media (max-width: 992px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:1.5rem}
  .grid-3{grid-template-columns:repeat(2,1fr)}
}
@media (max-width: 768px){
  .site-header{padding:1rem .8rem 1.2rem}
  .header-border{font-size:.625rem;letter-spacing:.1em}
  .site-nav{
    flex-wrap:wrap;border-radius:20px;
    padding:.75rem 1rem;
    align-items:center;
  }
  .brand__text{font-size:1.2rem}
  .nav-toggle{display:inline-flex}
  .nav-list{
    display:none;
    width:100%;flex-direction:column;
    align-items:stretch;gap:.4rem;
    margin-top:.8rem;padding-top:.8rem;
    border-top:1px solid rgba(255,255,255,.12);
  }
  .nav-list[data-open]{display:flex}
  .nav-list__link{
    padding:.8rem 1rem;border-radius:8px;
    font-size:1rem;
    background:rgba(255,255,255,.05);
  }
  .nav-list__link[aria-current="page"]{background:var(--accent);color:var(--main)}
  .footer-grid{grid-template-columns:1fr;gap:2rem;padding-top:2rem}
  .trust-strip__container{flex-direction:column;align-items:flex-start;gap:.6rem}
  .grid-2,.grid-3{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;gap:.3rem;text-align:center;align-items:center}
}
@media (max-width: 480px){
  .brand__text{font-size:1.05rem}
  .brand__shield{width:32px;height:32px}
  .site-nav{padding:.6rem .75rem}
  .container{padding-inline:1rem}
}
/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce){
  *{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }
}