:root{
    --concrete-dark:#232220;
    --concrete:#5b5852;
    --concrete-mid:#8c8880;
    --concrete-light:#eae7e0;
    --concrete-lighter:#f5f3ef;
    --safety-orange:#e2560c;
    --safety-orange-dark:#b8430a;
    --safety-yellow:#f2b705;
    --white:#ffffff;
    --radius:4px;
  }
  *{box-sizing:border-box; margin:0; padding:0;}
  html{scroll-behavior:smooth;}
  body{
    font-family:'Source Sans 3', sans-serif;
    color:var(--concrete-dark);
    background:var(--white);
    line-height:1.6;
  }
  h1,h2,h3,h4{
    font-family:'Barlow Condensed', sans-serif;
    font-weight:800;
    text-transform:uppercase;
    letter-spacing:0.3px;
    line-height:1.05;
    color:var(--concrete-dark);
  }
  a{color:inherit; text-decoration:none;}
  img{max-width:100%; display:block;}
  .container{max-width:1180px; margin:0 auto; padding:0 24px;}
  .eyebrow{
    font-family:'Barlow Condensed', sans-serif;
    font-weight:700;
    text-transform:uppercase;
    letter-spacing:2px;
    font-size:13px;
    color:var(--safety-orange-dark);
    margin-bottom:10px;
    display:inline-block;
  }
  /* hazard stripe signature element */
  .hazard-strip{
    height:10px;
    width:100%;
    background:repeating-linear-gradient(
      -45deg,
      var(--concrete-dark),
      var(--concrete-dark) 14px,
      var(--safety-yellow) 14px,
      var(--safety-yellow) 28px
    );
  }
  /* ---------- NAV ---------- */
  header{
    position:sticky; top:0; z-index:100;
    background:var(--white);
    border-bottom:1px solid var(--concrete-light);
  }
  .nav-inner{
    display:flex; align-items:center; justify-content:space-between;
    padding:14px 24px;
    max-width:1180px; margin:0 auto;
  }
  .logo{
    display:flex; align-items:center; gap:10px;
  }
  .logo-mark{
    width:38px; height:38px; background:var(--concrete-dark);
    border-radius:var(--radius);
    display:flex; align-items:center; justify-content:center;
    position:relative; overflow:hidden;
  }
  .logo-mark::after{
    content:"";
    position:absolute; inset:0;
    background:repeating-linear-gradient(-45deg, transparent, transparent 5px, var(--safety-yellow) 5px, var(--safety-yellow) 8px);
    opacity:0.9;
  }
  .logo-img{
    height:46px; width:auto; border-radius:6px; object-fit:cover;
  }
  .logo-text{
    font-family:'Barlow Condensed', sans-serif;
    font-weight:800; font-size:22px; letter-spacing:0.5px;
    text-transform:uppercase;
  }
  .logo-text span{color:var(--safety-orange);}
  .logo-sub{font-size:10px; color:var(--concrete); letter-spacing:1.5px; text-transform:uppercase; margin-top:-2px;}
  nav ul{list-style:none; display:flex; gap:28px;}
  nav a{
    font-size:15px; font-weight:600; color:var(--concrete-dark);
    padding:6px 0; border-bottom:2px solid transparent;
    transition:border-color .2s;
  }
  nav a:hover{border-color:var(--safety-orange);}
  .nav-cta{
    background:var(--safety-orange); color:var(--white) !important;
    padding:10px 20px; border-radius:var(--radius); font-weight:700 !important;
    border-bottom:none !important;
  }
  .nav-cta:hover{background:var(--safety-orange-dark) !important;}
  .menu-toggle{display:none; background:none; border:none; font-size:26px; cursor:pointer; color:var(--concrete-dark);}

  /* ---------- HERO ---------- */
  .hero{
    background:
      linear-gradient(rgba(24,23,21,0.88), rgba(24,23,21,0.93)),
      url("../images/hero-bg.jpg");
    background-size:cover;
    background-position:center 70%;
    color:var(--white);
    padding:90px 0 70px;
    position:relative;
    overflow:hidden;
  }
  .hero::before{
    content:"";
    position:absolute; top:0; right:-10%;
    width:60%; height:100%;
    background:repeating-linear-gradient(-45deg, transparent, transparent 40px, rgba(242,183,5,0.05) 40px, rgba(242,183,5,0.05) 80px);
    pointer-events:none;
  }
  .hero-inner{
    display:grid; grid-template-columns:1.3fr 1fr; gap:50px; align-items:center;
    position:relative; z-index:1;
  }
  .hero h1{
    color:var(--white);
    font-size:52px;
    margin-bottom:20px;
  }
  .hero h1 em{
    font-style:normal; color:var(--safety-yellow);
  }
  .hero p.lead{
    font-size:18px; color:var(--concrete-light); max-width:520px; margin-bottom:30px;
  }
  .btn{
    display:inline-block; padding:14px 30px; border-radius:var(--radius);
    font-weight:700; font-size:15px; text-transform:uppercase; letter-spacing:0.5px;
    cursor:pointer; border:2px solid transparent; transition:all .2s;
  }
  .btn-primary{background:var(--safety-orange); color:var(--white);}
  .btn-primary:hover{background:var(--safety-orange-dark);}
  .btn-outline{background:transparent; border-color:var(--white); color:var(--white); margin-left:14px;}
  .btn-outline:hover{background:var(--white); color:var(--concrete-dark);}
  .hero-stats{
    display:flex; flex-direction:column; gap:0;
    border-left:3px solid var(--safety-orange);
    padding-left:26px;
  }
  .hero-stat{padding:16px 0; border-bottom:1px solid rgba(255,255,255,0.12);}
  .hero-stat:last-child{border-bottom:none;}
  .hero-stat .num{font-family:'Barlow Condensed'; font-weight:800; font-size:40px; color:var(--safety-yellow); line-height:1;}
  .hero-stat .label{font-size:13px; color:var(--concrete-light); text-transform:uppercase; letter-spacing:1px; margin-top:4px;}

  /* ---------- SOBRE ---------- */
  .sobre{padding:80px 0; background:var(--concrete-lighter);}
  .sobre-grid{display:grid; grid-template-columns:1fr 1fr; gap:60px; align-items:start;}
  .sobre h2{font-size:36px; margin-bottom:18px;}
  .sobre p{color:var(--concrete); font-size:16px; margin-bottom:16px;}
  .norms-box{
    background:var(--white); border:1px solid var(--concrete-light);
    border-left:4px solid var(--safety-orange);
    padding:26px 28px; border-radius:var(--radius);
  }
  .norms-box h4{font-size:20px; margin-bottom:12px;}
  .norms-box ul{list-style:none;}
  .norms-box li{
    padding:9px 0; border-bottom:1px solid var(--concrete-light);
    font-size:15px; display:flex; gap:10px;
  }
  .norms-box li:last-child{border-bottom:none;}
  .norms-box li::before{content:"—"; color:var(--safety-orange); font-weight:700;}
  .norms-box .note{font-size:12.5px; color:var(--concrete-mid); margin-top:14px; font-style:italic;}

  /* ---------- SERVIÇOS ---------- */
  .servicos{padding:90px 0;}
  .section-head{text-align:center; max-width:640px; margin:0 auto 50px;}
  .section-head h2{font-size:38px;}
  .section-head p{color:var(--concrete); font-size:16px; margin-top:12px;}
  .servicos-grid{display:grid; grid-template-columns:repeat(2, 1fr); gap:28px;}
  .servico-card{
    border:1px solid var(--concrete-light); border-radius:var(--radius);
    padding:32px; position:relative; overflow:hidden;
    transition:transform .2s, box-shadow .2s;
  }
  .servico-card:hover{transform:translateY(-4px); box-shadow:0 12px 30px rgba(0,0,0,0.08);}
  .servico-card::before{
    content:""; position:absolute; top:0; left:0; width:100%; height:5px;
    background:var(--safety-orange);
  }
  .servico-icon{
    width:52px; height:52px; background:var(--concrete-dark); border-radius:var(--radius);
    display:flex; align-items:center; justify-content:center; font-size:26px; margin-bottom:18px;
  }
  .servico-card h3{font-size:24px; margin-bottom:10px;}
  .servico-card p{color:var(--concrete); font-size:15px; margin-bottom:10px;}
  .servico-tags{display:flex; flex-wrap:wrap; gap:8px; margin:14px 0 18px;}
  .servico-tags span{
    background:var(--concrete-lighter); color:var(--concrete); font-size:12px;
    padding:5px 10px; border-radius:20px; font-weight:600;
  }
  .servico-link{
    font-weight:700; color:var(--safety-orange-dark); font-size:14px;
    text-transform:uppercase; letter-spacing:0.5px;
    display:inline-flex; align-items:center; gap:6px;
  }
  .servico-link:hover{color:var(--concrete-dark);}

  /* ---------- PÚBLICO ---------- */
  .publico{background:var(--concrete-dark); padding:70px 0; color:var(--white);}
  .publico h2{color:var(--white); font-size:34px; text-align:center; margin-bottom:10px;}
  .publico > .container > p{text-align:center; color:var(--concrete-light); max-width:600px; margin:0 auto 40px;}
  .publico-grid{display:flex; flex-wrap:wrap; gap:12px; justify-content:center;}
  .publico-chip{
    border:1px solid rgba(255,255,255,0.25); padding:10px 20px; border-radius:30px;
    font-size:14px; font-weight:600; color:var(--concrete-light);
  }
  .publico-chip.destaque{
    background:var(--safety-orange); color:var(--white); border-color:var(--safety-orange);
  }

  /* ---------- CLIENTES ---------- */
  .clientes{padding:80px 0; background:var(--white);}
  .clientes-grid{
    display:grid; grid-template-columns:repeat(3, 1fr); gap:24px;
  }
  .cliente-card{
    border:1px solid var(--concrete-light); border-top:4px solid var(--safety-yellow);
    border-radius:var(--radius); padding:34px 20px; text-align:center;
    font-family:'Barlow Condensed'; font-weight:700; font-size:19px;
    color:var(--concrete-dark); text-transform:uppercase; letter-spacing:0.3px;
    display:flex; align-items:center; justify-content:center; min-height:110px;
  }
  @media(max-width:860px){
    .clientes-grid{grid-template-columns:1fr;}
  }

  /* ---------- PORTFÓLIO ---------- */
  .portfolio{padding:90px 0;}
  .portfolio-grid{display:grid; grid-template-columns:repeat(4, 1fr); gap:18px;}
  .foto-placeholder{
    aspect-ratio:4/3; background:var(--concrete-light);
    border:2px dashed var(--concrete-mid); border-radius:var(--radius);
    display:flex; flex-direction:column; align-items:center; justify-content:center;
    color:var(--concrete); font-size:13px; text-align:center; padding:16px; gap:8px;
  }
  .foto-placeholder .icon{font-size:30px; opacity:0.5;}
  .portfolio-item{
    position:relative; aspect-ratio:4/3; border-radius:var(--radius);
    overflow:hidden; background:var(--concrete-light);
  }
  .portfolio-item img{
    width:100%; height:100%; object-fit:cover; display:block;
    transition:transform .35s ease;
  }
  .portfolio-item:hover img{transform:scale(1.06);}
  .portfolio-caption{
    position:absolute; left:0; right:0; bottom:0;
    background:linear-gradient(transparent, rgba(24,23,21,0.92));
    color:var(--white); padding:26px 14px 12px; font-size:13px; font-weight:600;
    line-height:1.3;
  }
  .portfolio-caption span{
    display:block; font-size:11px; font-weight:700; text-transform:uppercase;
    letter-spacing:0.5px; color:var(--safety-yellow); margin-bottom:3px;
  }

  /* ---------- CONTATO ---------- */
  .contato{background:var(--concrete-lighter); padding:90px 0;}
  .contato-grid{display:grid; grid-template-columns:1fr 1.2fr; gap:50px;}
  .contato-info h2{font-size:34px; margin-bottom:16px;}
  .contato-info p{color:var(--concrete); margin-bottom:26px;}
  .info-item{display:flex; gap:14px; margin-bottom:20px; align-items:flex-start;}
  .info-icon{
    width:40px; height:40px; background:var(--safety-orange); border-radius:var(--radius);
    display:flex; align-items:center; justify-content:center; color:white; flex-shrink:0; font-size:18px;
  }
  .info-item h4{font-family:'Source Sans 3'; font-size:15px; text-transform:none; font-weight:700; margin-bottom:2px;}
  .info-item p{margin:0; font-size:14px; color:var(--concrete);}

  form{background:var(--white); padding:36px; border-radius:var(--radius); border:1px solid var(--concrete-light);}
  .form-row{display:grid; grid-template-columns:1fr 1fr; gap:16px; margin-bottom:16px;}
  .form-group{margin-bottom:16px;}
  .form-group label{display:block; font-size:13px; font-weight:700; text-transform:uppercase; letter-spacing:0.5px; color:var(--concrete-dark); margin-bottom:6px;}
  .form-group input, .form-group select, .form-group textarea{
    width:100%; padding:12px 14px; border:1px solid var(--concrete-mid); border-radius:var(--radius);
    font-family:'Source Sans 3'; font-size:15px; color:var(--concrete-dark); background:var(--white);
  }
  .form-group input:focus, .form-group select:focus, .form-group textarea:focus{
    outline:none; border-color:var(--safety-orange); box-shadow:0 0 0 3px rgba(226,86,12,0.12);
  }
  .form-group textarea{resize:vertical; min-height:100px;}
  .form-submit{width:100%; border:none; font-family:'Barlow Condensed'; cursor:pointer;}
  .form-note{font-size:13px; color:var(--concrete-mid); margin-top:12px; text-align:center;}
  .form-success{
    display:none; background:#e9f7ef; border:1px solid #34a853; color:#1e7e39;
    padding:16px; border-radius:var(--radius); font-size:14px; margin-bottom:16px; font-weight:600;
  }
  .form-error{
    display:none; background:#fdecea; border:1px solid #e2560c; color:#b8430a;
    padding:16px; border-radius:var(--radius); font-size:14px; margin-bottom:16px; font-weight:600;
  }
  .form-submit[disabled]{opacity:0.7; cursor:not-allowed;}

  /* ---------- FOOTER ---------- */
  footer{background:var(--concrete-dark); color:var(--concrete-light); padding:40px 0 24px;}
  .footer-inner{display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:16px;}
  .footer-inner p{font-size:13px; color:var(--concrete-mid);}
  .footer-social{display:flex; gap:14px;}
  .footer-social a{
    width:36px; height:36px; border:1px solid rgba(255,255,255,0.2); border-radius:var(--radius);
    display:flex; align-items:center; justify-content:center; font-size:16px;
  }
  .footer-social a:hover{background:var(--safety-orange); border-color:var(--safety-orange);}

  /* ---------- RESPONSIVE ---------- */
  @media(max-width:860px){
    nav ul{display:none;}
    .menu-toggle{display:block;}
    .hero-inner{grid-template-columns:1fr;}
    .hero h1{font-size:38px;}
    .sobre-grid{grid-template-columns:1fr;}
    .servicos-grid{grid-template-columns:1fr;}
    .portfolio-grid{grid-template-columns:repeat(2,1fr);}
    .contato-grid{grid-template-columns:1fr;}
    .form-row{grid-template-columns:1fr;}
  }
  @media(max-width:480px){
    .portfolio-grid{grid-template-columns:1fr;}
    .btn-outline{margin-left:0; margin-top:10px;}
  }

  /* focus visibility for accessibility */
  a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible{
    outline:3px solid var(--safety-yellow); outline-offset:2px;
  }

  /* ---------- FLOATING WHATSAPP BUTTON ---------- */
  .whatsapp-float{
    position:fixed; bottom:24px; right:24px; z-index:999;
    background:#25D366; color:#fff;
    width:60px; height:60px; border-radius:50%;
    display:flex; align-items:center; justify-content:center;
    box-shadow:0 6px 18px rgba(0,0,0,0.25);
    font-size:30px;
    transition:transform .2s ease, box-shadow .2s ease;
  }
  .whatsapp-float:hover{
    transform:scale(1.08);
    box-shadow:0 8px 22px rgba(0,0,0,0.32);
  }
  .whatsapp-float svg{width:30px; height:30px;}
  @media(max-width:480px){
    .whatsapp-float{width:52px; height:52px; bottom:16px; right:16px;}
    .whatsapp-float svg{width:26px; height:26px;}
  }