.houli-voltage-guide{
  --navy:#071b31;
  --navy2:#0d3155;
  --blue:#168eea;
  --orange:#f47b20;
  --orange2:#ff9b25;
  --green:#20a85a;
  --red:#dc2b2b;
  --light:#f5f8fb;
  --border:#dce5ee;
  --text:#15263a;
  --muted:#617386;

  width:100%;
  max-width:1180px;
  margin:0 auto;
  padding:0 16px 60px;
  font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;
  color:var(--text);
  line-height:1.65;
}

.houli-voltage-guide *{
  box-sizing:border-box;
}

.houli-voltage-guide h1,
.houli-voltage-guide h2,
.houli-voltage-guide h3,
.houli-voltage-guide p{
  margin-top:0;
}

/* HERO */

.hv-hero{
  margin-top:20px;
  padding:54px 42px;
  border-radius:22px;
  background:
    radial-gradient(circle at 85% 15%,rgba(22,142,234,.28),transparent 30%),
    linear-gradient(135deg,var(--navy),var(--navy2));
  color:#fff;
  text-align:center;
  overflow:hidden;
}

.hv-kicker{
  display:inline-block;
  margin-bottom:14px;
  padding:7px 16px;
  border:1px solid rgba(255,255,255,.28);
  border-radius:99px;
  font-size:14px;
  font-weight:700;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:#d9ebfb;
}

.hv-hero h1{
  margin-bottom:16px;
  font-size:44px;
  line-height:1.16;
  font-weight:800;
}

.hv-hero h1 span{
  color:var(--orange2);
}

.hv-hero p{
  max-width:850px;
  margin:0 auto;
  font-size:19px;
  color:#e6eef6;
}

/* IMPORTANT WARNING */

.hv-critical{
  margin:24px 0;
  padding:20px 24px;
  border-left:6px solid var(--red);
  border-radius:14px;
  background:#fff1f1;
  color:#6f1515;
  font-size:17px;
}

.hv-critical strong{
  color:#aa1414;
}

/* MAIN IMAGE */

.hv-main-image{
  margin:30px 0 42px;
  text-align:center;
}

.hv-main-image img{
  display:block;
  width:100%;
  max-width:1050px;
  height:auto;
  margin:0 auto;
  border-radius:20px;
  box-shadow:0 12px 35px rgba(9,34,57,.13);
}

/* GENERAL SECTION */

.hv-section{
  margin-top:50px;
}

.hv-section-title{
  text-align:center;
  margin-bottom:28px;
}

.hv-section-title h2{
  margin-bottom:8px;
  font-size:32px;
  line-height:1.25;
  color:var(--navy);
}

.hv-section-title p{
  margin-bottom:0;
  color:var(--muted);
  font-size:17px;
}

/* 12V / 24V CARDS */

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

.hv-card{
  padding:28px;
  border:1px solid var(--border);
  border-radius:18px;
  background:#fff;
  box-shadow:0 7px 24px rgba(12,49,88,.06);
}

.hv-card-12{
  border-top:6px solid var(--orange);
}

.hv-card-24{
  border-top:6px solid var(--blue);
}

.hv-version{
  display:flex;
  align-items:center;
  gap:12px;
  margin-bottom:18px;
}

.hv-badge{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-width:76px;
  height:44px;
  padding:0 16px;
  border-radius:10px;
  font-weight:800;
  color:#fff;
  font-size:21px;
}

.hv-badge.orange{
  background:var(--orange);
}

.hv-badge.blue{
  background:var(--blue);
}

.hv-version h3{
  margin:0;
  font-size:25px;
  color:var(--navy);
}

.hv-checks{
  list-style:none;
  padding:0;
  margin:0;
}

.hv-checks li{
  position:relative;
  padding-left:34px;
  margin:13px 0;
}

.hv-checks li:before{
  content:"✓";
  position:absolute;
  left:0;
  top:2px;
  display:flex;
  align-items:center;
  justify-content:center;
  width:23px;
  height:23px;
  border-radius:50%;
  background:var(--green);
  color:#fff;
  font-size:14px;
  font-weight:800;
}

/* COMPARISON TABLE */

.hv-table-wrap{
  overflow-x:auto;
  border-radius:16px;
  border:1px solid var(--border);
  background:#fff;
}

.hv-table{
  width:100%;
  min-width:680px;
  border-collapse:collapse;
}

.hv-table th,
.hv-table td{
  padding:17px 18px;
  text-align:left;
  border-bottom:1px solid var(--border);
}

.hv-table th{
  background:var(--navy);
  color:#fff;
  font-size:15px;
}

.hv-table tr:last-child td{
  border-bottom:none;
}

.hv-good{
  color:var(--green);
  font-weight:800;
}

.hv-warn{
  color:var(--red);
  font-weight:800;
}

/* STEPS */

.hv-how{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:18px;
}

.hv-step{
  padding:24px 20px;
  text-align:center;
  border:1px solid var(--border);
  border-radius:17px;
  background:var(--light);
}

.hv-step-num{
  width:44px;
  height:44px;
  margin:0 auto 14px;
  display:flex;
  align-items:center;
  justify-content:center;
  border-radius:50%;
  background:var(--navy);
  color:#fff;
  font-weight:800;
  font-size:20px;
}

.hv-step h3{
  margin-bottom:7px;
  font-size:18px;
  color:var(--navy);
}

.hv-step p{
  margin:0;
  font-size:15px;
  color:var(--muted);
}

/* DANGER AREA */

.hv-danger{
  margin-top:48px;
  padding:32px;
  border-radius:20px;
  background:linear-gradient(135deg,#fff2f2,#fff8f5);
  border:1px solid #f3c5c5;
}

.hv-danger h2{
  margin-bottom:18px;
  font-size:30px;
  color:#9e1717;
}

.hv-danger ul{
  margin:0;
  padding-left:22px;
}

.hv-danger li{
  margin:10px 0;
}

.hv-note{
  margin-top:22px;
  padding:18px 20px;
  border-radius:12px;
  background:#fff;
  border:1px solid #f1d2d2;
  color:#6b2525;
  font-weight:700;
}

/* ORDER CHECKLIST */

.hv-checklist{
  margin-top:48px;
  padding:32px;
  border-radius:20px;
  background:#f5f9fd;
  border:1px solid #d8e5ef;
}

.hv-checklist h2{
  margin-bottom:20px;
  text-align:center;
  color:var(--navy);
  font-size:30px;
}

.hv-checklist-grid{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:14px;
}

.hv-check-item{
  padding:16px 18px;
  border-radius:12px;
  background:#fff;
  border:1px solid #dfe8f0;
  font-weight:700;
}

.hv-check-item:before{
  content:"✓";
  margin-right:10px;
  color:var(--green);
  font-weight:900;
}

/* CTA */

.hv-cta{
  margin-top:48px;
  padding:38px 30px;
  text-align:center;
  border-radius:20px;
  background:linear-gradient(135deg,var(--navy),#104a7c);
  color:#fff;
}

.hv-cta h2{
  font-size:31px;
  margin-bottom:9px;
}

.hv-cta p{
  max-width:760px;
  margin:0 auto 22px;
  color:#dceaf6;
  font-size:17px;
}

.hv-buttons{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:14px;
}

.hv-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-width:235px;
  padding:14px 24px;
  border-radius:10px;
  color:#fff !important;
  text-decoration:none !important;
  font-weight:800;
  transition:.2s ease;
}

.hv-btn:hover{
  transform:translateY(-2px);
}

.hv-btn-12{
  background:var(--orange);
}

.hv-btn-24{
  background:var(--blue);
}

/* FAQ */

.hv-faq{
  max-width:900px;
  margin:0 auto;
}

.hv-faq-item{
  margin-bottom:13px;
  padding:21px 23px;
  border:1px solid var(--border);
  border-radius:14px;
  background:#fff;
}

.hv-faq-item h3{
  margin-bottom:8px;
  font-size:18px;
  color:var(--navy);
}

.hv-faq-item p{
  margin:0;
  color:#506274;
}

.hv-final-warning{
  margin-top:38px;
  text-align:center;
  padding:20px;
  border-radius:14px;
  background:#fff5df;
  border:1px solid #f6d28d;
  font-weight:800;
  color:#7c5100;
}

/* MOBILE */

@media(max-width:800px){

  .hv-hero{
    padding:38px 20px;
  }

  .hv-hero h1{
    font-size:33px;
  }

  .hv-grid-2{
    grid-template-columns:1fr;
  }

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

  .hv-checklist-grid{
    grid-template-columns:1fr;
  }

  .hv-section-title h2{
    font-size:27px;
  }
}

@media(max-width:520px){

  .houli-voltage-guide{
    padding:0 10px 40px;
  }

  .hv-hero h1{
    font-size:28px;
  }

  .hv-hero p{
    font-size:16px;
  }

  .hv-how{
    grid-template-columns:1fr;
  }

  .hv-card{
    padding:22px 18px;
  }

  .hv-danger{
    padding:24px 18px;
  }

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