:root{
  --bg:#ffffff;
  --surface:#f5f5f5;
  --ink:#0a0a0a;
  --muted:#666666;
  --line:#e0e0e0;
  --accent:#333333;
  --accent-glow:rgba(51,51,51,0.05);
  --neon-yellow:#ffeb3b;
  --neon-black:#000000;
  --neon-glow-yellow:rgba(255,235,59,0.4);
  --neon-glow-black:rgba(0,0,0,0.1);
  --sidebar:280px;
  --content:720px;
  --gutter:80px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}

body{
  font-family:'Inter',-apple-system,BlinkMacSystemFont,sans-serif;
  background:var(--bg);
  color:var(--ink);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  font-size:16px;
}

a{color:var(--ink);text-decoration:none}

.mono{
  font-family:'SF Mono',Monaco,monospace;
  font-size:12px;
  letter-spacing:0.02em;
}

/* Layout */
.page{
  display:flex;
  min-height:100vh;
}

/* Sidebar */
.sidebar{
  width:var(--sidebar);
  padding:60px 40px;
  position:fixed;
  height:100vh;
  display:flex;
  flex-direction:column;
  justify-content:space-between;
  border-right:2px solid var(--ink);
  background:var(--bg);
}

.sidebar__brand{
  font-size:24px;
  font-weight:800;
  letter-spacing:-0.03em;
  line-height:1.2;
  color:var(--ink);
  text-transform:uppercase;
}

.sidebar__brand span{
  display:block;
  font-size:13px;
  font-weight:400;
  color:var(--muted);
  margin-top:8px;
  letter-spacing:0;
  text-transform:none;
}

.sidebar__nav{
  display:flex;
  flex-direction:column;
  gap:8px;
}

.sidebar__nav a{
  font-size:14px;
  color:var(--muted);
  padding:6px 0;
  transition:all .2s;
  position:relative;
  padding-left:16px;
  font-weight:500;
}

.sidebar__nav a::before{
  content:"";
  position:absolute;
  left:0;
  top:50%;
  transform:translateY(-50%);
  width:6px;
  height:6px;
  background:var(--line);
  transition:all .2s;
}

.sidebar__nav a:hover,
.sidebar__nav a.active{
  color:var(--ink);
  font-weight:700;
}

.sidebar__nav a:hover::before,
.sidebar__nav a.active::before{
  background:var(--neon-yellow);
  box-shadow:0 0 0 2px var(--neon-yellow);
}

.sidebar__contact{
  font-size:13px;
  color:var(--muted);
  line-height:1.8;
}

.sidebar__contact a{
  color:var(--muted);
  border-bottom:1px solid var(--line);
  transition:all .2s;
}

.sidebar__contact a:hover{
  color:var(--ink);
  border-color:var(--neon-yellow);
  background:var(--neon-yellow);
}

.sidebar__contact strong{
  display:block;
  color:var(--ink);
  font-weight:700;
  margin-bottom:8px;
}

/* Main Content */
.main{
  margin-left:var(--sidebar);
  flex:1;
  padding:0 var(--gutter);
}

.content{
  max-width:var(--content);
  margin:0 auto;
}

/* Sections */
section{
  padding:100px 0;
  border-bottom:2px solid var(--ink);
}

section:last-child{
  border-bottom:none;
}

/* Hero - Extended */
.hero{
  min-height:100vh;
  display:flex;
  flex-direction:column;
  justify-content:center;
  padding:80px 0;
  position:relative;
}

.hero::before{
  content:"";
  position:absolute;
  top:15%;
  right:-80px;
  width:300px;
  height:300px;
  background:var(--neon-yellow);
  opacity:0.3;
  pointer-events:none;
  mix-blend-mode:multiply;
}

.hero::after{
  content:"";
  position:absolute;
  bottom:20%;
  left:-40px;
  width:200px;
  height:200px;
  background:var(--neon-black);
  opacity:0.05;
  pointer-events:none;
}

.hero__label{
  font-size:11px;
  text-transform:uppercase;
  letter-spacing:0.25em;
  color:var(--ink);
  font-weight:800;
  margin-bottom:24px;
  display:inline-flex;
  align-items:center;
  gap:12px;
  background:var(--neon-yellow);
  padding:8px 16px;
}

.hero__label::before{
  content:"";
  width:0;
}

.hero h1{
  font-size:64px;
  line-height:1;
  font-weight:800;
  letter-spacing:-0.04em;
  margin-bottom:32px;
  color:var(--ink);
  text-transform:uppercase;
}

.hero__lead{
  font-size:22px;
  line-height:1.6;
  color:var(--muted);
  max-width:600px;
  margin-bottom:40px;
  font-weight:400;
}

.hero__description{
  font-size:17px;
  line-height:1.8;
  color:var(--muted);
  max-width:640px;
  margin-bottom:48px;
  padding-left:24px;
  border-left:4px solid var(--neon-yellow);
}

.hero__description strong{
  color:var(--ink);
  font-weight:700;
  background:var(--neon-yellow);
  padding:0 4px;
}

.hero__meta{
  display:flex;
  gap:32px;
  font-size:13px;
  color:var(--muted);
  flex-wrap:wrap;
  font-weight:600;
  text-transform:uppercase;
  letter-spacing:0.1em;
}

.hero__meta span{
  position:relative;
  padding-left:16px;
}

.hero__meta span::before{
  content:"";
  position:absolute;
  left:0;
  top:50%;
  transform:translateY(-50%);
  width:8px;
  height:8px;
  background:var(--neon-yellow);
}

/* Concept Block */
.concept-block{
  background:var(--surface);
  border:2px solid var(--ink);
  padding:32px;
  margin:48px 0;
  position:relative;
}

.concept-block::before{
  content:"";
  position:absolute;
  top:-8px;
  left:-8px;
  right:8px;
  bottom:8px;
  background:var(--neon-yellow);
  z-index:-1;
  opacity:0.3;
}

.concept-block h3{
  font-size:13px;
  text-transform:uppercase;
  letter-spacing:0.15em;
  color:var(--ink);
  margin-bottom:16px;
  font-weight:800;
  background:var(--neon-yellow);
  display:inline-block;
  padding:4px 12px;
}

.concept-block p{
  color:var(--muted);
  line-height:1.8;
  font-size:16px;
}

/* Section Header */
.section-header{
  margin-bottom:60px;
}

.section-header__label{
  font-size:11px;
  text-transform:uppercase;
  letter-spacing:0.25em;
  color:var(--ink);
  font-weight:800;
  margin-bottom:16px;
  display:inline-flex;
  align-items:center;
  gap:12px;
  background:var(--neon-yellow);
  padding:8px 16px;
}

.section-header__label::before{
  content:"";
  width:0;
}

.section-header h2{
  font-size:48px;
  font-weight:800;
  letter-spacing:-0.03em;
  line-height:1.1;
  color:var(--ink);
  text-transform:uppercase;
}

/* Products - Bold List Style */
.product-list{
  display:flex;
  flex-direction:column;
}

.product-item{
  padding:48px 0;
  border-bottom:2px solid var(--ink);
  display:grid;
  grid-template-columns:1fr auto;
  gap:40px;
  align-items:start;
  transition:all .3s;
  margin:0 -40px;
  padding-left:40px;
  padding-right:40px;
  position:relative;
}

.product-item:first-child{
  padding-top:0;
}

.product-item:last-child{
  border-bottom:none;
}

.product-item:hover{
  background:var(--surface);
}

.product-item:hover::before{
  content:"";
  position:absolute;
  left:0;
  top:0;
  bottom:0;
  width:8px;
  background:var(--neon-yellow);
}

.product-item__content h3{
  font-size:32px;
  font-weight:800;
  margin-bottom:12px;
  letter-spacing:-0.02em;
  transition:all .3s;
  color:var(--ink);
  text-transform:uppercase;
}

.product-item:hover .product-item__content h3{
  background:var(--neon-yellow);
  display:inline;
  padding:0 8px;
}

.product-item__content p{
  color:var(--muted);
  font-size:17px;
  line-height:1.6;
  max-width:480px;
}

.product-item__meta{
  text-align:right;
}

.product-item__price{
  font-size:36px;
  font-weight:800;
  color:var(--ink);
  margin-bottom:8px;
  background:var(--neon-yellow);
  padding:8px 16px;
  display:inline-block;
}

.product-item__note{
  font-size:13px;
  color:var(--muted);
  font-weight:600;
  text-transform:uppercase;
  letter-spacing:0.05em;
}

.product-features{
  display:flex;
  gap:24px;
  margin-top:24px;
  font-size:14px;
  color:var(--muted);
  flex-wrap:wrap;
  font-weight:600;
  text-transform:uppercase;
  letter-spacing:0.05em;
}

.product-features span{
  position:relative;
  padding-left:20px;
}

.product-features span::before{
  content:"—";
  position:absolute;
  left:0;
  color:var(--ink);
  font-weight:800;
}

/* Process - Bold Timeline */
.process-list{
  display:flex;
  flex-direction:column;
  gap:48px;
}

.process-item{
  display:grid;
  grid-template-columns:100px 1fr;
  gap:32px;
  align-items:start;
}

.process-item__num{
  font-size:56px;
  font-weight:800;
  color:var(--line);
  line-height:1;
  font-family:'Inter',sans-serif;
  transition:all .3s;
  text-align:center;
  background:var(--surface);
  padding:20px;
  border:2px solid var(--ink);
}

.process-item:hover .process-item__num{
  background:var(--neon-yellow);
  color:var(--ink);
}

.process-item__content h3{
  font-size:22px;
  font-weight:800;
  margin-bottom:8px;
  color:var(--ink);
  text-transform:uppercase;
  letter-spacing:0.02em;
}

.process-item__content p{
  color:var(--muted);
  font-size:17px;
}

/* FAQ */
.faq-list{
  display:flex;
  flex-direction:column;
}

.faq-item{
  border-bottom:2px solid var(--ink);
  padding:32px 0;
}

.faq-item:first-child{
  padding-top:0;
}

.faq-item summary{
  font-size:20px;
  font-weight:800;
  cursor:pointer;
  list-style:none;
  display:flex;
  justify-content:space-between;
  align-items:center;
  transition:all .2s;
  color:var(--ink);
  text-transform:uppercase;
  letter-spacing:0.02em;
}

.faq-item summary:hover{
  background:var(--neon-yellow);
  padding:8px;
  margin:-8px;
}

.faq-item summary::after{
  content:"+";
  font-size:28px;
  font-weight:800;
  color:var(--ink);
  width:40px;
  height:40px;
  display:grid;
  place-items:center;
  border:2px solid var(--ink);
  background:var(--bg);
  transition:all .2s;
}

.faq-item:hover summary::after{
  background:var(--neon-yellow);
}

.faq-item[open] summary::after{
  content:"−";
  background:var(--ink);
  color:var(--neon-yellow);
  border-color:var(--ink);
}

.faq-item p{
  color:var(--muted);
  margin-top:20px;
  font-size:17px;
  line-height:1.7;
  max-width:560px;
}

/* Form */
.form-section{
  background:var(--surface);
  margin:0 -80px;
  padding:100px 80px;
  position:relative;
  border-top:2px solid var(--ink);
}

.form-section::before{
  content:"";
  position:absolute;
  top:-12px;
  left:80px;
  width:120px;
  height:12px;
  background:var(--neon-yellow);
}

.form-container{
  max-width:var(--content);
  margin:0 auto;
}

.form-header{
  margin-bottom:48px;
}

.form-header h2{
  font-size:40px;
  font-weight:800;
  margin-bottom:16px;
  letter-spacing:-0.03em;
  color:var(--ink);
  text-transform:uppercase;
}

.form-header p{
  color:var(--muted);
  font-size:19px;
}

.form-grid{
  display:grid;
  gap:32px;
  margin-bottom:40px;
}

.form-row{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:32px;
}

.form-field{
  display:flex;
  flex-direction:column;
  gap:8px;
}

.form-field label{
  font-size:12px;
  text-transform:uppercase;
  letter-spacing:0.15em;
  color:var(--ink);
  font-weight:800;
  background:var(--neon-yellow);
  display:inline-block;
  padding:4px 12px;
  width:fit-content;
}

.form-field input{
  height:64px;
  border:none;
  border-bottom:3px solid var(--ink);
  background:var(--bg);
  font:inherit;
  font-size:20px;
  color:var(--ink);
  transition:all .2s;
  border-radius:0;
  padding:0 16px;
  font-weight:500;
}

.form-field input:focus{
  outline:none;
  border-color:var(--neon-yellow);
  background:var(--neon-yellow);
  box-shadow:8px 8px 0 var(--ink);
}

.form-field input::placeholder{
  color:var(--muted);
}

/* Radio Group */
.radio-group{
  margin-bottom:40px;
}

.radio-group__label{
  font-size:12px;
  text-transform:uppercase;
  letter-spacing:0.15em;
  color:var(--ink);
  font-weight:800;
  margin-bottom:20px;
  display:block;
  background:var(--neon-yellow);
  padding:8px 16px;
  width:fit-content;
}

.radio-options{
  display:flex;
  flex-direction:column;
  gap:16px;
}

.radio-option{
  display:block;
  cursor:pointer;
}

.radio-option input{
  position:absolute;
  opacity:0;
}

.radio-option__content{
  display:grid;
  grid-template-columns:1fr auto;
  gap:24px;
  padding:28px;
  border:2px solid var(--ink);
  transition:all .2s;
  background:var(--bg);
}

.radio-option__title{
  font-size:20px;
  font-weight:800;
  margin-bottom:4px;
  color:var(--ink);
  text-transform:uppercase;
  letter-spacing:0.02em;
}

.radio-option__desc{
  font-size:15px;
  color:var(--muted);
  font-weight:500;
}

.radio-option__price{
  font-size:28px;
  font-weight:800;
  color:var(--ink);
  background:var(--neon-yellow);
  padding:8px 16px;
}

.radio-option input:checked + .radio-option__content{
  border-color:var(--ink);
  background:var(--neon-yellow);
  box-shadow:8px 8px 0 var(--ink);
}

.radio-option:hover .radio-option__content{
  background:var(--surface);
}

/* Button */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  height:72px;
  padding:0 56px;
  background:var(--ink);
  color:var(--bg);
  font-size:16px;
  font-weight:800;
  border:3px solid var(--ink);
  cursor:pointer;
  transition:all .2s;
  position:relative;
  overflow:hidden;
  text-transform:uppercase;
  letter-spacing:0.1em;
}

.btn::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  width:100%;
  height:100%;
  background:var(--neon-yellow);
  transform:translateY(100%);
  transition:transform .3s;
}

.btn:hover::before{
  transform:translateY(0);
}

.btn span{
  position:relative;
  z-index:1;
}

.btn:hover{
  color:var(--ink);
  box-shadow:8px 8px 0 var(--ink);
  transform:translate(-4px,-4px);
}

.btn--full{
  width:100%;
}

/* Disclaimer */
.disclaimer{
  font-size:14px;
  color:var(--muted);
  line-height:1.6;
  margin-top:32px;
  padding-top:32px;
  border-top:2px solid var(--ink);
  font-weight:500;
}

.disclaimer a{
  color:var(--ink);
  text-decoration:underline;
  text-underline-offset:3px;
  font-weight:700;
  background:var(--neon-yellow);
  padding:0 4px;
}

/* Footer */
.site-footer{
  margin-left:var(--sidebar);
  padding:40px 80px;
  border-top:2px solid var(--ink);
  display:flex;
  justify-content:space-between;
  font-size:13px;
  color:var(--muted);
  background:var(--surface);
  font-weight:600;
  text-transform:uppercase;
  letter-spacing:0.05em;
}

.footer-links{
  display:flex;
  gap:24px;
}

.footer-links a:hover{
  color:var(--ink);
  background:var(--neon-yellow);
  padding:4px 8px;
  margin:-4px -8px;
}

/* Mobile */
@media (max-width:1100px){
  .sidebar{
    display:none;
  }
  .main{
    margin-left:0;
    padding:0 32px;
  }
  .site-footer{
    margin-left:0;
    padding:32px;
    flex-direction:column;
    gap:16px;
    text-align:center;
  }
  .form-section{
    margin:0 -32px;
    padding:60px 32px;
  }
  .hero h1{
    font-size:42px;
  }
  .product-item{
    grid-template-columns:1fr;
    gap:24px;
  }
  .product-item__meta{
    text-align:left;
  }
  .form-row{
    grid-template-columns:1fr;
  }
  .hero::before,
  .hero::after{
    display:none;
  }
  .process-item{
    grid-template-columns:70px 1fr;
  }
  .process-item__num{
    font-size:36px;
    padding:12px;
  }
}

@media (max-width:600px){
  .hero h1{
    font-size:32px;
  }
  .section-header h2{
    font-size:28px;
  }
  .product-item h3{
    font-size:24px;
  }
  .concept-block{
    padding:24px;
  }
  .concept-block::before{
    display:none;
  }
}