/* ===== RESET ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{min-height:100vh;line-height:1.6;font-family:system-ui,-apple-system,sans-serif;background:var(--bg-dark);color:var(--text-light);-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
button{cursor:pointer;border:none;background:transparent;font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* ===== VARIABLES ===== */
:root{
  --bg-dark:#0a1f3d;
  --accent:#ff3b30;
  --accent-glow:0 0 12px rgba(255,59,48,.45);
  --gold:#ffd700;
  --gold-dim:rgba(255,215,0,.25);
  --text-light:#ffffff;
  --bg-light:#f0f0f0;
  --text-dark:#333333;
  --tech:#00bcd4;
  --nav-width:260px;
  --header-h-mobile:60px;
  --radius:4px;
  --shadow-card:0 2px 12px rgba(0,0,0,.35);
  --transition:0.3s cubic-bezier(.22,.61,.36,1);
  --font-heading:Impact,'Futura Bold','Arial Black',sans-serif;
  --font-body:system-ui,-apple-system,sans-serif;
  --font-accent:monospace;
}
@media(max-width:767px){
  :root{--nav-width:0px}
}

/* ===== SKIP LINK ===== */
.skip-link{
  position:fixed;top:-100%;left:0;z-index:9999;
  padding:.5rem 1rem;background:var(--accent);color:#fff;
  font-weight:700;font-size:.875rem;border-radius:0 0 var(--radius) 0;
  transition:top .2s
}
.skip-link:focus{top:0}

/* ===== HEADER ===== */
.site-header{
  position:fixed;top:0;left:0;z-index:900;
  width:var(--nav-width);height:100vh;
  background:var(--bg-dark);
  display:flex;flex-direction:column;
  border-right:1px solid rgba(255,255,255,.06);
  overflow:hidden;
}
.header-bar{
  display:flex;align-items:center;justify-content:space-between;
  padding:1.25rem 1.25rem .5rem;
  border-bottom:1px solid rgba(255,255,255,.06);
}
.brand-link{
  font-family:var(--font-heading);font-weight:900;font-size:1.5rem;
  letter-spacing:.02em;color:var(--text-light);text-transform:uppercase;
}
.brand-link::after{content:'';display:block;width:40%;height:3px;background:var(--accent);margin-top:2px;border-radius:2px}
.nav-toggle{display:none;width:40px;height:40px;flex-direction:column;justify-content:center;align-items:center;gap:5px}
.nav-toggle-icon{display:block;width:24px;height:2px;background:var(--text-light);border-radius:2px;transition:var(--transition)}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.nav-panel{flex:1;padding:.5rem 0;overflow-y:auto}
.nav-list{counter-reset:nav-counter;display:flex;flex-direction:column;gap:2px}
.nav-item{counter-increment:nav-counter;position:relative}
.nav-link{
  display:flex;align-items:center;gap:.75rem;
  padding:.75rem 1.25rem .75rem 1rem;
  font-family:var(--font-body);font-weight:500;font-size:.9375rem;
  color:rgba(255,255,255,.7);letter-spacing:.01em;
  border-left:3px solid transparent;
  transition:var(--transition);position:relative;
}
.nav-link::before{
  content:"0" counter(nav-counter);
  font-family:var(--font-accent);font-size:.75rem;
  color:var(--gold);opacity:.6;width:1.8rem;text-align:right;
  transition:var(--transition);
}
.nav-link:hover,.nav-link:focus-visible{color:var(--text-light);background:rgba(255,255,255,.04)}
.nav-link[aria-current="page"]{
  color:var(--text-light);border-left-color:var(--accent);
  background:linear-gradient(90deg,rgba(255,59,48,.12) 0%,transparent 80%);
  box-shadow:inset 3px 0 0 var(--accent);
}
.nav-link[aria-current="page"]::before{color:var(--accent);opacity:1}
.nav-link[aria-current="page"]::after{
  content:'';position:absolute;top:0;right:0;width:80px;height:100%;
  background:linear-gradient(135deg,transparent 49.5%,rgba(255,59,48,.18) 49.5%,rgba(255,59,48,.18) 50.5%,transparent 50.5%);
  pointer-events:none;
}
.scroll-progress{
  position:absolute;bottom:0;left:0;width:0;height:3px;
  background:var(--accent);box-shadow:var(--accent-glow);
  transition:width .1s linear;z-index:5;
}

/* ===== HEADER MOBILE ===== */
@media(max-width:767px){
  .site-header{
    width:100%;height:var(--header-h-mobile);flex-direction:row;
    border-right:none;border-bottom:1px solid rgba(255,255,255,.06);
    align-items:center;overflow:visible;
  }
  .header-bar{flex:1;padding:.5rem 1rem;border-bottom:none}
  .brand-link{font-size:1.25rem}
  .brand-link::after{width:30%}
  .nav-toggle{display:flex}
  .nav-panel{
    position:fixed;top:var(--header-h-mobile);left:0;width:280px;height:calc(100vh - var(--header-h-mobile));
    background:var(--bg-dark);border-right:1px solid rgba(255,255,255,.08);
    transform:translateX(-110%);transition:transform var(--transition);
    box-shadow:4px 0 20px rgba(0,0,0,.4);padding:.5rem 0;z-index:899;
  }
  .nav-panel[data-open]{transform:translateX(0)}
  .nav-link{padding:.7rem 1rem .7rem .75rem;font-size:.9rem}
  .scroll-progress{position:fixed;top:var(--header-h-mobile);left:0;width:0;height:3px;z-index:901}
}

/* ===== MAIN CONTENT OFFSET ===== */
#main-content{margin-left:var(--nav-width);padding:0;min-height:100vh}
@media(max-width:767px){#main-content{margin-left:0;padding-top:var(--header-h-mobile)}}

/* ===== FOOTER ===== */
.site-footer{
  background:var(--bg-dark);color:var(--text-light);
  border-top:1px solid rgba(255,255,255,.06);
  padding:3rem 1.5rem 1.5rem;margin-left:var(--nav-width);
  position:relative;overflow:hidden;
}
.site-footer::before{
  content:'';position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--accent) 0%,var(--gold) 50%,var(--tech) 100%);
  opacity:.5;
}
.footer-container{max-width:1100px;margin:0 auto;display:grid;grid-template-columns:2fr 1fr 2fr;gap:2rem;align-items:start}
.footer-brand{display:flex;flex-direction:column;gap:.35rem}
.footer-logo{
  font-family:var(--font-heading);font-weight:900;font-size:1.35rem;
  color:var(--text-light);text-transform:uppercase;letter-spacing:.03em;
}
.footer-logo::after{content:'';display:block;width:48px;height:2px;background:var(--accent);margin-top:4px;border-radius:2px}
.footer-tagline{font-size:.85rem;color:rgba(255,255,255,.55);font-family:var(--font-body)}
.footer-links{display:flex;flex-direction:column;gap:.5rem;padding-top:.25rem}
.footer-link{
  font-size:.875rem;color:rgba(255,255,255,.7);
  transition:var(--transition);position:relative;width:fit-content;
  padding-left:1rem;border-left:2px solid transparent;
}
.footer-link:hover,.footer-link:focus-visible{color:var(--accent);border-left-color:var(--accent);padding-left:1.25rem}
.footer-contact{display:flex;flex-direction:column;gap:.35rem;padding-top:.25rem}
.footer-contact-item{font-size:.8rem;color:rgba(255,255,255,.55);font-family:var(--font-body);line-height:1.5}
.footer-legal{grid-column:1/-1;display:flex;justify-content:space-between;align-items:center;padding-top:1.5rem;margin-top:1rem;border-top:1px solid rgba(255,255,255,.06)}
.footer-icp{font-size:.75rem;color:rgba(255,255,255,.4);font-family:var(--font-accent)}
.footer-copyright{font-size:.75rem;color:rgba(255,255,255,.4);font-family:var(--font-accent)}

@media(max-width:767px){
  .site-footer{margin-left:0;padding:2rem 1rem 1rem}
  .footer-container{grid-template-columns:1fr;gap:1.25rem}
  .footer-legal{flex-direction:column;gap:.5rem;align-items:flex-start}
}

/* ===== BUTTONS ===== */
.btn{
  display:inline-flex;align-items:center;gap:.5rem;
  padding:.6rem 1.4rem;font-family:var(--font-body);font-weight:600;
  font-size:.9375rem;border-radius:var(--radius);
  transition:var(--transition);text-align:center;line-height:1.2;
  border:1px solid transparent;
}
.btn-primary{background:var(--accent);color:#fff;border-color:var(--accent);box-shadow:0 2px 8px rgba(255,59,48,.25)}
.btn-primary:hover,.btn-primary:focus-visible{background:#e0352b;box-shadow:0 4px 16px rgba(255,59,48,.4);transform:translateY(-1px)}
.btn-secondary{background:transparent;color:var(--text-light);border-color:rgba(255,255,255,.25)}
.btn-secondary:hover,.btn-secondary:focus-visible{border-color:var(--accent);color:var(--accent)}

/* ===== BREADCRUMB ===== */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:.35rem .5rem;
  padding:.75rem 0;font-size:.8rem;color:rgba(255,255,255,.5);
  font-family:var(--font-accent);
}
.breadcrumb a{color:rgba(255,255,255,.7);transition:var(--transition)}
.breadcrumb a:hover,.breadcrumb a:focus-visible{color:var(--accent)}
.breadcrumb .separator{color:rgba(255,255,255,.25);user-select:none}

/* ===== SECTION ===== */
.section{padding:3rem 1.5rem;position:relative}
.section-dark{background:var(--bg-dark)}
.section-light{background:var(--bg-light);color:var(--text-dark)}
.section-light .section-title{color:var(--text-dark)}
.section-light .section-title .section-number{color:var(--accent)}
.section-container{max-width:1100px;margin:0 auto}
.section-title{
  font-family:var(--font-heading);font-weight:900;font-size:2.25rem;
  color:var(--text-light);margin-bottom:1.5rem;display:flex;align-items:center;gap:1rem;
}
.section-number{
  font-family:var(--font-accent);font-size:1rem;color:var(--gold);
  background:rgba(255,215,0,.12);padding:.2rem .6rem;border-radius:var(--radius);
  border:1px solid rgba(255,215,0,.2);
}
.section-sub{font-size:1rem;font-weight:400;color:rgba(255,255,255,.6);font-family:var(--font-body);margin-top:-.75rem;margin-bottom:2rem}

/* ===== CARD ===== */
.card{
  background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);
  border-radius:var(--radius);padding:1.5rem;
  box-shadow:var(--shadow-card);transition:var(--transition);
  position:relative;overflow:hidden;
}
.card::before{content:'';position:absolute;top:0;left:0;width:3px;height:0;background:var(--accent);transition:height .4s}
.card:hover::before,.card:focus-within::before{height:100%}
.card:hover{box-shadow:0 4px 20px rgba(0,0,0,.45);transform:translateY(-2px)}
.card-title{font-family:var(--font-heading);font-weight:900;font-size:1.25rem;margin-bottom:.5rem;color:var(--text-light)}
.card-content{font-size:.9rem;line-height:1.65;color:rgba(255,255,255,.7)}
.card-light{background:var(--bg-light);color:var(--text-dark);border-color:rgba(0,0,0,.06)}
.card-light .card-title{color:var(--text-dark)}
.card-light .card-content{color:var(--text-dark)}

/* ===== CONTENT CONTAINER ===== */
.content-container{max-width:760px;margin:0 auto;padding:0 1.5rem}
.content-container h2{font-family:var(--font-heading);font-weight:900;font-size:1.75rem;margin:2rem 0 .75rem;color:var(--text-light)}
.content-container h3{font-family:var(--font-heading);font-weight:700;font-size:1.25rem;margin:1.5rem 0 .5rem;color:var(--text-light)}
.content-container p{margin-bottom:1rem;font-size:1rem;line-height:1.7}
.content-container a{color:var(--accent);border-bottom:1px solid transparent;transition:var(--transition)}
.content-container a:hover{border-bottom-color:var(--accent)}

/* ===== IMAGE WRAPPER ===== */
.image-wrapper{position:relative;overflow:hidden;border-radius:var(--radius);background:rgba(255,255,255,.04);margin:1.5rem 0}
.image-wrapper-16x9{padding-bottom:56.25%}
.image-wrapper-4x3{padding-bottom:75%}
.image-wrapper img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover}
.image-wrapper .placeholder{position:absolute;top:0;left:0;width:100%;height:100%;display:flex;align-items:center;justify-content:center;font-size:.85rem;color:rgba(255,255,255,.3);font-family:var(--font-accent);background:linear-gradient(135deg,rgba(255,255,255,.03) 0%,rgba(255,255,255,.08) 100%)}

/* ===== TAG ===== */
.tag{display:inline-block;background:var(--gold);color:var(--text-dark);font-size:.7rem;font-weight:700;padding:.15rem .55rem;border-radius:2px;font-family:var(--font-accent);text-transform:uppercase;letter-spacing:.04em}

/* ===== ANIMATIONS ===== */
.fade-in{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.fade-in.visible{opacity:1;transform:translateY(0)}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:0.01ms!important;transition-duration:0.01ms!important}
  html{scroll-behavior:auto}
  .fade-in{opacity:1;transform:none}
  .scroll-progress{display:none}
}

/* ===== RESPONSIVE UTILITY ===== */
@media(max-width:767px){
  .section{padding:2rem 1rem}
  .section-title{font-size:1.6rem;flex-wrap:wrap}
  .content-container{padding:0 1rem}
  .card{padding:1.25rem}
}