:root{
  --bg:#07111f;
  --bg-strong:#030711;
  --panel:rgba(13,25,42,.82);
  --panel-soft:rgba(255,255,255,.055);
  --border:rgba(255,255,255,.12);
  --text:#f4f8fc;
  --text-soft:#cdd8e5;
  --muted:#9fb0c4;
  --accent:#00bfff;
  --accent-soft:rgba(0,191,255,.18);
  --shadow:0 0 34px rgba(0,0,0,.28);
}

*{
  margin:0;
  padding:0;
  box-sizing:border-box;
  font-family:Arial,Helvetica,sans-serif;
}

html{
  scroll-behavior:smooth;
}

body{
  background:var(--bg);
  color:var(--text);
  line-height:1.7;
  overflow-x:hidden;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  background:
    linear-gradient(rgba(3,7,17,.8), rgba(3,7,17,.94)),
    url("logo.png") center/cover no-repeat;
  filter:blur(6px);
  transform:scale(1.08);
  z-index:-2;
}

body::after{
  content:"";
  position:fixed;
  inset:0;
  background:
    radial-gradient(circle at top, rgba(0,191,255,.26), transparent 42%),
    linear-gradient(180deg, rgba(7,17,31,.15), rgba(7,17,31,.65));
  z-index:-1;
}

a{
  color:inherit;
}

.site-header{
  background:rgba(3,7,17,.86);
  backdrop-filter:blur(12px);
  border-bottom:1px solid rgba(255,255,255,.1);
  padding:18px 20px 24px;
  text-align:center;
}

.site-logo{
  width:115px;
  height:115px;
  object-fit:cover;
  border-radius:24px;
  box-shadow:0 0 28px rgba(0,191,255,.35);
}

.site-title{
  margin-top:12px;
  font-size:42px;
  color:var(--accent);
  text-shadow:0 0 18px rgba(0,191,255,.35);
}

.site-subtitle{
  margin-top:6px;
  color:var(--muted);
  font-size:17px;
}

.site-nav{
  display:flex;
  justify-content:center;
  gap:12px;
  flex-wrap:wrap;
  margin-top:18px;
}

.nav-link{
  text-decoration:none;
  font-weight:700;
  padding:11px 18px;
  border-radius:999px;
  background:rgba(255,255,255,.08);
  border:1px solid rgba(255,255,255,.12);
  transition:.25s ease;
}

.nav-link:hover,
.nav-link.is-active{
  background:var(--accent);
  color:#06101c;
  box-shadow:0 0 20px rgba(0,191,255,.35);
}

.page-shell{
  max-width:1260px;
  margin:0 auto;
  padding:42px 22px 0;
}

.hero,
.panel,
.card,
.toc,
details{
  background:var(--panel);
  border:1px solid var(--border);
  box-shadow:var(--shadow);
}

.hero{
  border-radius:30px;
  padding:52px 36px;
  text-align:center;
}

.hero-compact{
  padding:38px 30px;
}

.hero__eyebrow{
  display:inline-block;
  margin-bottom:14px;
  padding:7px 14px;
  border-radius:999px;
  background:var(--accent-soft);
  border:1px solid rgba(0,191,255,.25);
  color:#9adfff;
  font-size:14px;
  letter-spacing:.04em;
  text-transform:uppercase;
}

.hero h2{
  font-size:52px;
  color:var(--accent);
  margin-bottom:18px;
  text-shadow:0 0 18px rgba(0,191,255,.25);
}

.hero p{
  color:#dce6f0;
  font-size:19px;
  max-width:940px;
  margin:0 auto 16px;
}

.button-row{
  display:flex;
  justify-content:center;
  gap:16px;
  flex-wrap:wrap;
  margin-top:30px;
}

.btn{
  display:inline-block;
  text-decoration:none;
  padding:15px 28px;
  border-radius:14px;
  font-size:18px;
  font-weight:700;
  transition:.25s ease;
}

.btn:hover{
  transform:translateY(-3px);
}

.btn-primary{
  background:var(--accent);
  color:#06101c;
  box-shadow:0 0 28px rgba(0,191,255,.35);
}

.btn-primary:hover{
  background:#35d0ff;
}

.btn-secondary{
  color:var(--text);
  background:rgba(255,255,255,.08);
  border:1px solid rgba(255,255,255,.16);
}

.btn-secondary:hover{
  background:rgba(255,255,255,.15);
}

.content-section{
  padding:40px 0;
}

.content-section-tight{
  padding:26px 0 8px;
}

.section-heading{
  margin-bottom:26px;
  text-align:center;
  font-size:38px;
  color:var(--accent);
}

.section-heading-left{
  text-align:left;
}

.grid{
  display:grid;
  gap:22px;
}

.grid-2{
  grid-template-columns:repeat(2,minmax(0,1fr));
}

.grid-3{
  grid-template-columns:repeat(3,minmax(0,1fr));
}

.grid-4{
  grid-template-columns:repeat(4,minmax(0,1fr));
}

.card,
.panel{
  border-radius:24px;
  padding:28px;
}

.card h3,
.panel h3{
  color:var(--accent);
  font-size:24px;
  margin-bottom:12px;
}

.card p,
.panel p{
  color:var(--text-soft);
}

.split-layout{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:22px;
}

.step-stack{
  display:grid;
  gap:16px;
}

.step-card{
  display:flex;
  gap:16px;
  align-items:flex-start;
  padding:18px;
  border-radius:18px;
  background:rgba(255,255,255,.05);
  border:1px solid rgba(255,255,255,.08);
}

.step-card h3{
  margin-bottom:6px;
  font-size:22px;
}

.step-number{
  min-width:56px;
  height:56px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border-radius:16px;
  background:var(--accent-soft);
  color:#8fe0ff;
  font-weight:700;
  font-size:18px;
  border:1px solid rgba(0,191,255,.22);
}

.feature-list{
  padding-left:22px;
  color:var(--text-soft);
}

.feature-list li{
  margin-bottom:10px;
}

.callout{
  margin-top:20px;
  padding:16px 18px;
  border-left:4px solid var(--accent);
  border-radius:14px;
  background:rgba(0,191,255,.08);
  color:#dce6f0;
}

.quick-links{
  display:flex;
  justify-content:center;
  gap:12px;
  flex-wrap:wrap;
  margin-top:28px;
}

.quick-links a{
  text-decoration:none;
  padding:10px 16px;
  border-radius:999px;
  background:rgba(255,255,255,.07);
  border:1px solid rgba(255,255,255,.1);
  color:#d7e3ef;
  transition:.25s ease;
}

.quick-links a:hover{
  color:#06101c;
  background:var(--accent);
}

.search-input{
  width:100%;
  padding:18px 20px;
  border-radius:16px;
  border:1px solid rgba(255,255,255,.15);
  background:#0d1a2c;
  color:var(--text);
  font-size:18px;
  outline:none;
}

.search-input:focus{
  border-color:var(--accent);
  box-shadow:0 0 0 3px rgba(0,191,255,.12);
}

.toc{
  border-radius:24px;
  padding:24px;
  margin:10px 0 34px;
}

.toc h2{
  color:var(--accent);
  margin-bottom:16px;
}

.toc-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(230px,1fr));
  gap:10px;
}

.toc-grid a{
  text-decoration:none;
  color:#d7e3ef;
  background:rgba(255,255,255,.055);
  padding:11px 14px;
  border-radius:12px;
  border:1px solid rgba(255,255,255,.075);
  transition:.2s ease;
}

.toc-grid a:hover{
  color:var(--accent);
  border-color:var(--accent);
  transform:translateX(4px);
}

details{
  border-radius:20px;
  margin-bottom:16px;
  overflow:hidden;
}

details[open]{
  border-color:rgba(0,191,255,.38);
}

summary{
  cursor:pointer;
  list-style:none;
  padding:22px 24px;
  font-size:22px;
  font-weight:700;
  color:var(--accent);
  background:rgba(0,0,0,.18);
}

summary::-webkit-details-marker{
  display:none;
}

summary::after{
  content:"+";
  float:right;
  width:30px;
  height:30px;
  border-radius:50%;
  text-align:center;
  background:rgba(0,191,255,.25);
  color:#fff;
}

details[open] summary::after{
  content:"-";
}

.rule-content{
  padding:24px;
}

.rule-content h3{
  margin:20px 0 8px;
  color:var(--accent);
  font-size:19px;
}

.rule-content p{
  color:#dce5ef;
  margin:8px 0 12px;
}

.site-footer{
  text-align:center;
  padding:34px 18px;
  margin-top:44px;
  background:rgba(3,7,17,.9);
  border-top:1px solid rgba(255,255,255,.08);
  color:#8fa3b8;
}

@media(max-width:1080px){
  .grid-4,
  .grid-3,
  .grid-2,
  .split-layout{
    grid-template-columns:1fr 1fr;
  }
}

@media(max-width:820px){
  .site-title{
    font-size:32px;
  }

  .hero{
    padding:38px 22px;
  }

  .hero h2{
    font-size:38px;
  }

  .hero p{
    font-size:17px;
  }

  .section-heading{
    font-size:30px;
  }

  summary{
    font-size:18px;
    padding:18px;
  }
}

@media(max-width:700px){
  .page-shell{
    padding:28px 14px 0;
  }

  .grid-4,
  .grid-3,
  .grid-2,
  .split-layout{
    grid-template-columns:1fr;
  }

  .card,
  .panel,
  .toc,
  .rule-content{
    padding:20px;
  }

  .step-card{
    flex-direction:column;
  }

  .site-logo{
    width:92px;
    height:92px;
  }
}