/* ========== 1. Reset ========== */
*,*::before,*::after{box-sizing:border-box}
*{margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{min-height:100vh}
img,picture,svg,video{display:block;max-width:100%}
input,button,textarea,select{font:inherit}
ul,ol{list-style:none}
a{color:inherit}

/* ========== 2. Tokens ========== */
:root{
  --color-primary:#0B1F3F;
  --color-accent:#00FF85;
  --color-accent-alt:#FF6B00;
  --color-surface:#1A2A4A;
  --color-light:#F5F8FF;
  --color-data:#00D4FF;
  --color-warn:#FFD700;
  --color-dim:#3A5F8A;
  --font-heading:'Anton','Archivo Black','Noto Sans SC','Microsoft YaHei','Arial Black',sans-serif;
  --font-body:'Inter','Roboto','PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;
  --font-data:'JetBrains Mono','Courier New',monospace;
  --border-w:2px;
  --shadow-hard:0 4px 0 rgba(0,0,0,0.35);
  --radius:2px;
  --container-w:1160px;
  --gap:1.5rem;
  --header-h-mobile:auto;
}

/* ========== 3. Base ========== */
body{
  font-family:var(--font-body);
  font-size:1rem;
  line-height:1.68;
  color:var(--color-light);
  background-color:var(--color-primary);
}
h1,h2,h3,h4,h5{
  font-family:var(--font-heading);
  font-weight:400;
  line-height:1.2;
  color:var(--color-light);
  letter-spacing:0.02em;
}
h1{font-size:clamp(2.2rem,4vw,3.5rem)}
h2{font-size:clamp(1.6rem,2.5vw,2.4rem)}
h3{font-size:1.35rem}
h4{font-size:1.1rem}
p{color:var(--color-light)}
a{transition:color .15s ease,background-color .15s ease,border-color .15s ease,box-shadow .15s ease}
::selection{background:var(--color-accent);color:var(--color-primary)}

/* ========== 4. Utilities ========== */
.container{
  width:min(var(--container-w),92%);
  margin-inline:auto;
}
.sr-only{
  position:absolute;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;
  clip:rect(0,0,0,0);
  white-space:nowrap;
  border:0;
}
#main-content{min-height:60vh;outline:none}

/* ========== 5. Skip Link ========== */
.skip-link{
  position:fixed;
  top:0;
  left:1.25rem;
  z-index:2000;
  display:inline-block;
  padding:.6rem 1.1rem;
  background:var(--color-accent);
  color:var(--color-primary);
  font-weight:700;
  font-size:.875rem;
  text-decoration:none;
  border:var(--border-w) solid var(--color-primary);
  border-radius:var(--radius);
  transform:translateY(-150%);
  transition:transform .2s ease;
}
.skip-link:focus{
  transform:translateY(0);
}

/* ========== 6. Header ========== */
.site-header{
  position:sticky;
  top:0;
  z-index:100;
  background:var(--color-primary);
  border-bottom:var(--border-w) solid var(--color-dim);
  box-shadow:0 4px 12px rgba(0,0,0,.25);
}
.scroll-progress{
  position:absolute;
  top:0;
  left:0;
  height:3px;
  width:0%;
  background:linear-gradient(90deg,var(--color-accent),var(--color-data));
  z-index:10;
  pointer-events:none;
}
.site-header__masthead{
  position:relative;
  display:flex;
  justify-content:center;
  align-items:center;
  padding:1.1rem 4rem 0.9rem;
  border-bottom:var(--border-w) solid var(--color-dim);
  background:
    linear-gradient(135deg,rgba(0,255,133,.04) 0%,rgba(0,255,133,0) 45%),
    var(--color-primary);
}
.site-header__masthead::after{
  content:'';
  position:absolute;
  bottom:-2px;
  left:0;
  width:100%;
  height:2px;
  background:var(--color-accent);
  clip-path:polygon(0 0,18% 100%,100% 0,100% 0,0 0);
  opacity:.5;
}

/* Brand */
.brand{
  display:inline-flex;
  align-items:center;
  gap:.75rem;
  text-decoration:none;
  flex-shrink:1;
  min-width:0;
}
.brand__mark{
  display:grid;
  place-items:center;
  width:3rem;
  height:3rem;
  background:var(--color-accent);
  color:var(--color-primary);
  font-family:var(--font-heading);
  font-size:1.15rem;
  font-weight:700;
  letter-spacing:.03em;
  clip-path:polygon(0 0,86% 0,100% 14%,100% 86%,14% 100%,0 86%);
  box-shadow:var(--shadow-hard);
  transition:clip-path .2s ease,transform .2s ease;
}
.brand:hover .brand__mark{
  clip-path:polygon(14% 0,100% 0,100% 86%,86% 100%,0 100%,0 14%);
  transform:rotate(-2deg);
}
.brand__type{
  display:flex;
  flex-direction:column;
  line-height:1.15;
}
.brand__name{
  font-family:var(--font-heading);
  font-size:1.6rem;
  letter-spacing:.06em;
  color:var(--color-light);
  white-space:nowrap;
}
.brand__subtitle{
  font-family:var(--font-data);
  font-size:.6rem;
  letter-spacing:.3em;
  text-transform:uppercase;
  color:var(--color-accent);
  margin-top:.15rem;
}

/* ========== 7. Navigation ========== */
.site-nav{
  display:block;
  background:var(--color-primary);
}
.site-nav__list{
  display:flex;
  justify-content:center;
  align-items:stretch;
  gap:0;
}
.site-nav__item{
  position:relative;
}
.site-nav__item + .site-nav__item{
  border-left:1px solid var(--color-dim);
}
.site-nav__link{
  display:flex;
  align-items:center;
  gap:.45rem;
  padding:.9rem 1.3rem;
  font-family:var(--font-body);
  font-weight:650;
  font-size:.95rem;
  color:var(--color-light);
  text-decoration:none;
  letter-spacing:.02em;
  transition:background-color .15s ease,color .15s ease,box-shadow .15s ease;
  position:relative;
  white-space:nowrap;
}
.site-nav__link::before{
  content:attr(data-nav-index);
  font-family:var(--font-data);
  font-size:.6rem;
  font-weight:400;
  color:var(--color-accent);
  line-height:1;
  opacity:.85;
  transition:color .15s ease;
}
.site-nav__link:hover{
  background:var(--color-surface);
  color:var(--color-accent);
  box-shadow:inset 0 -3px 0 var(--color-accent);
}
.site-nav__link:hover::before{
  color:var(--color-data);
}
.site-nav__link[aria-current="page"]{
  background:var(--color-accent);
  color:var(--color-primary);
  box-shadow:inset 0 -3px 0 var(--color-accent-alt);
}
.site-nav__link[aria-current="page"]::before{
  color:var(--color-primary);
  opacity:1;
}

/* Nav Toggle */
.nav-toggle{
  display:none;
  position:absolute;
  right:1.1rem;
  top:50%;
  transform:translateY(-50%);
  flex-direction:column;
  justify-content:center;
  gap:5px;
  width:2.75rem;
  height:2.75rem;
  padding:.55rem;
  background:var(--color-surface);
  border:var(--border-w) solid var(--color-dim);
  border-radius:var(--radius);
  cursor:pointer;
  transition:border-color .15s ease,background-color .15s ease;
}
.nav-toggle:hover{
  border-color:var(--color-accent);
  background:var(--color-primary);
}
.nav-toggle__bar{
  display:block;
  height:2px;
  width:100%;
  background:var(--color-accent);
  border-radius:1px;
  transition:transform .2s ease,background-color .2s ease,opacity .2s ease;
}
.nav-toggle--active .nav-toggle__bar:nth-child(1){
  transform:translateY(7px) rotate(45deg);
}
.nav-toggle--active .nav-toggle__bar:nth-child(2){
  opacity:0;
}
.nav-toggle--active .nav-toggle__bar:nth-child(3){
  transform:translateY(-7px) rotate(-45deg);
}

/* ========== 8. Buttons ========== */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  padding:.8rem 1.6rem;
  font-family:var(--font-body);
  font-weight:700;
  font-size:.9rem;
  text-decoration:none;
  border:var(--border-w) solid transparent;
  border-radius:var(--radius);
  cursor:pointer;
  transition:transform .15s ease,box-shadow .15s ease,background-color .15s ease,color .15s ease,border-color .15s ease;
}
.btn:hover{
  transform:translateY(-2px);
}
.btn:active{
  transform:translateY(0);
}
.btn--accent{
  background:var(--color-accent);
  color:var(--color-primary);
  box-shadow:0 3px 0 rgba(0,255,133,.35);
}
.btn--accent:hover{
  box-shadow:0 5px 0 rgba(0,255,133,.45);
}
.btn--outline{
  background:transparent;
  color:var(--color-light);
  border-color:var(--color-dim);
}
.btn--outline:hover{
  border-color:var(--color-accent);
  color:var(--color-accent);
  box-shadow:0 3px 0 rgba(0,255,133,.15);
}
.btn--alt{
  background:var(--color-accent-alt);
  color:var(--color-light);
  box-shadow:0 3px 0 rgba(255,107,0,.35);
}
.btn--alt:hover{
  box-shadow:0 5px 0 rgba(255,107,0,.45);
}

/* ========== 9. Breadcrumb ========== */
.breadcrumb{
  padding:.9rem 0;
  border-bottom:1px solid var(--color-dim);
  margin-bottom:2rem;
}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:0;
}
.breadcrumb__item{
  font-size:.85rem;
  color:var(--color-dim);
}
.breadcrumb__item + .breadcrumb__item::before{
  content:'/';
  margin:0 .55rem;
  color:var(--color-dim);
  font-family:var(--font-data);
}
.breadcrumb__link{
  color:var(--color-data);
  text-decoration:none;
  transition:color .15s ease;
}
.breadcrumb__link:hover{
  color:var(--color-accent);
  text-decoration:underline;
}
.breadcrumb__item[aria-current="page"]{
  color:var(--color-accent);
  font-weight:600;
}

/* ========== 10. Section Heading ========== */
.section-heading{
  display:flex;
  align-items:baseline;
  gap:1rem;
  margin:0 0 1.4rem;
  padding-bottom:.5rem;
  border-bottom:2px solid var(--color-dim);
}
.section-heading__num{
  font-family:var(--font-data);
  font-size:clamp(2rem,3.5vw,3.2rem);
  font-weight:700;
  color:var(--color-accent);
  line-height:1;
}
.section-heading__text{
  font-family:var(--font-heading);
  font-size:clamp(1.3rem,2vw,1.8rem);
  color:var(--color-light);
  letter-spacing:.03em;
  text-transform:uppercase;
}

/* ========== 11. Panels & Cards ========== */
.panel{
  background:var(--color-surface);
  border:2px solid var(--color-dim);
  border-radius:var(--radius);
  box-shadow:var(--shadow-hard);
  padding:1.6rem;
  margin-bottom:1.8rem;
  position:relative;
}
.panel::before{
  content:attr(data-panel-number);
  position:absolute;
  top:-.7rem;
  left:1rem;
  background:var(--color-primary);
  color:var(--color-accent);
  font-family:var(--font-data);
  font-size:.75rem;
  font-weight:700;
  padding:.2rem .6rem;
  border:1px solid var(--color-dim);
  border-radius:1px;
}
.panel--dark{
  background:var(--color-primary);
}
.panel--light{
  background:var(--color-light);
  color:var(--color-primary);
}
.panel--light .section-heading__text,
.panel--light p{
  color:var(--color-primary);
}
.card{
  background:var(--color-surface);
  border:2px solid var(--color-dim);
  border-radius:var(--radius);
  box-shadow:var(--shadow-hard);
  padding:1.4rem;
  transition:border-color .15s ease,clip-path .2s ease,transform .15s ease;
  clip-path:polygon(0 0,calc(100% - .6rem) 0,100% .6rem,100% 100%,.6rem 100%,0 calc(100% - .6rem));
}
.card:hover{
  border-color:var(--color-accent);
  transform:translateY(-2px);
  clip-path:polygon(.6rem 0,100% 0,100% calc(100% - .6rem),calc(100% - .6rem) 100%,0 100%,0 .6rem);
}
.card__title{
  font-size:1.15rem;
  margin-bottom:.75rem;
  color:var(--color-light);
  border-bottom:1px solid var(--color-dim);
  padding-bottom:.5rem;
}
.card__body{
  font-size:.9rem;
  color:var(--color-dim);
  line-height:1.6;
}

/* ========== 12. Tags ========== */
.tag{
  display:inline-block;
  padding:.25rem .75rem;
  font-family:var(--font-data);
  font-size:.7rem;
  font-weight:600;
  letter-spacing:.08em;
  color:var(--color-light);
  background:var(--color-primary);
  border:1px solid var(--color-dim);
  border-radius:1px;
  text-transform:uppercase;
}
.tag--accent{
  color:var(--color-accent);
  border-color:var(--color-accent);
}
.tag--alt{
  color:var(--color-accent-alt);
  border-color:var(--color-accent-alt);
}

/* ========== 13. Media Placeholder ========== */
.media-frame{
  position:relative;
  width:100%;
  aspect-ratio:16/10;
  background:var(--color-surface);
  border:2px solid var(--color-dim);
  clip-path:polygon(0 0,calc(100% - 1rem) 0,100% 1rem,100% 100%,1rem 100%,0 calc(100% - 1rem));
  overflow:hidden;
  transition:border-color .15s ease;
}
.media-frame::after{
  content:'IMG';
  position:absolute;
  inset:0;
  display:grid;
  place-items:center;
  font-family:var(--font-data);
  font-size:.9rem;
  font-weight:600;
  letter-spacing:.4em;
  color:var(--color-dim);
  background:
    repeating-linear-gradient(
      -45deg,
      rgba(0,212,255,.03) 0,
      rgba(0,212,255,.03) 8px,
      transparent 8px,
      transparent 16px
    );
}
.media-frame:hover{
  border-color:var(--color-data);
}

/* ========== 14. Footer ========== */
.site-footer{
  background:var(--color-primary);
  border-top:3px solid var(--color-accent);
  margin-top:4rem;
  position:relative;
}
.site-footer::before{
  content:'';
  position:absolute;
  top:-3px;
  left:0;
  width:100%;
  height:3px;
  background:var(--color-accent-alt);
  clip-path:polygon(0 0,22% 100%,100% 0);
  opacity:.45;
}
.site-footer__inner{
  width:min(var(--container-w),94%);
  margin-inline:auto;
}
.site-footer__top{
  display:grid;
  grid-template-columns:1.6fr 1fr 1.4fr;
  gap:2.5rem;
  padding:2.8rem 0 2rem;
}
.site-footer__brand{
  display:flex;
  flex-direction:column;
  gap:1rem;
}
.brand--footer .brand__name{
  font-size:1.4rem;
}
.brand--footer .brand__mark{
  width:2.5rem;
  height:2.5rem;
  font-size:1rem;
}
.brand--footer .brand__subtitle{
  font-size:.55rem;
}
.site-footer__statement{
  font-size:.85rem;
  color:var(--color-dim);
  line-height:1.7;
  border-left:2px solid var(--color-accent);
  padding-left:.9rem;
}
.site-footer__heading{
  font-family:var(--font-heading);
  font-size:1rem;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--color-accent);
  border-bottom:1px solid var(--color-dim);
  padding-bottom:.5rem;
  margin-bottom:1rem;
}
.site-footer__links li{
  margin-bottom:.55rem;
}
.site-footer__links a{
  color:var(--color-light);
  text-decoration:none;
  font-size:.9rem;
  transition:color .15s ease,padding-left .15s ease;
}
.site-footer__links a:hover{
  color:var(--color-accent);
  padding-left:.25rem;
}
.site-footer__contact li{
  display:flex;
  flex-direction:column;
  margin-bottom:.65rem;
  font-size:.85rem;
  color:var(--color-light);
}
.site-footer__label{
  font-family:var(--font-data);
  font-size:.62rem;
  text-transform:uppercase;
  letter-spacing:.15em;
  color:var(--color-data);
  margin-bottom:.1rem;
}
.site-footer__note{
  font-size:.75rem;
  color:var(--color-dim);
  margin-top:.8rem;
  line-height:1.6;
  border-top:1px dashed var(--color-dim);
  padding-top:.8rem;
}
.site-footer__meta{
  display:flex;
  justify-content:space-between;
  align-items:center;
  border-top:2px solid var(--color-dim);
  padding:1rem 0;
  font-family:var(--font-data);
  font-size:.75rem;
  color:var(--color-dim);
}
.site-footer__meta p{
  font-family:var(--font-data);
  font-size:.75rem;
  color:var(--color-dim);
}

/* ========== 15. Focus ========== */
:focus-visible{
  outline:3px solid var(--color-warn);
  outline-offset:2px;
  border-radius:1px;
}
.nav-toggle:focus-visible,
.site-nav__link:focus-visible,
.brand:focus-visible,
.btn:focus-visible,
.breadcrumb__link:focus-visible,
.skip-link:focus-visible{
  outline-color:var(--color-warn);
}

/* ========== 16. Reduced Motion ========== */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }
}

/* ========== 17. Responsive ========== */
@media (max-width: 60rem){
  .site-footer__top{
    grid-template-columns:1fr 1fr;
    gap:2rem;
  }
  .site-footer__brand{
    grid-column:1 / -1;
  }
}
@media (max-width: 48rem){
  .site-header__masthead{
    padding:1rem 3.5rem 1rem 1rem;
    justify-content:flex-start;
  }
  .site-header__masthead::after{
    clip-path:none;
    opacity:.9;
    height:2px;
  }
  .nav-toggle{
    display:flex;
    right:.9rem;
  }
  .site-nav{
    display:none;
    border-top:2px solid var(--color-dim);
    box-shadow:0 8px 16px rgba(0,0,0,.3);
  }
  .site-nav[data-open]{
    display:block;
  }
  .site-nav__list{
    flex-direction:column;
    width:100%;
  }
  .site-nav__item{
    border-top:1px solid rgba(58,95,138,.4);
  }
  .site-nav__item + .site-nav__item{
    border-left:none;
  }
  .site-nav__link{
    padding:.85rem 1.4rem;
    border-radius:0;
  }
  .site-nav__link::before{
    content:attr(data-nav-index);
    display:inline-block;
    width:2.2rem;
  }
  .brand__name{
    font-size:1.35rem;
  }
  .brand__mark{
    width:2.5rem;
    height:2.5rem;
    font-size:.95rem;
  }
  .brand__subtitle{
    font-size:.5rem;
    letter-spacing:.15em;
  }
  .site-footer__top{
    grid-template-columns:1fr;
    gap:1.8rem;
    padding:2rem 0 1.5rem;
  }
  .site-footer__brand{
    grid-column:auto;
  }
  .site-footer__meta{
    flex-direction:column;
    gap:.4rem;
    text-align:center;
  }
  .container{
    width:92%;
  }
  .panel{
    padding:1.2rem;
  }
  .section-heading{
    flex-direction:column;
    gap:.35rem;
    align-items:flex-start;
  }
}
@media (max-width: 22.5rem){
  .brand__name{
    font-size:1.15rem;
  }
  .brand__subtitle{
    font-size:.48rem;
  }
}