/* ==========================================================================
   GFENG Engenharia — Design System compartilhado
   Mesma linguagem visual das páginas energiasolar.html / cursoenergiasolar.html
   / eletromobilidadegfeng.html — fundo escuro + acento laranja.
   ========================================================================== */

:root{
  --bg:#0a0e17;
  --bg-alt:#0d1220;
  --card:#12172a;
  --card-border:#232a42;
  --text:#e7ebf3;
  --text-muted:#9aa3b8;
  --orange:#f5a623;
  --orange-dark:#d98c12;
  --green:#25d366;
  --blue:#2f6fed;
  --radius:14px;
  --max:1180px;
  --font: 'Poppins','Segoe UI',Arial,Helvetica,sans-serif;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--font);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
ul{margin:0;padding:0;}
h1,h2,h3,h4{font-weight:800;line-height:1.15;margin:0 0 .5em;}
p{margin:0 0 1em;color:var(--text-muted);}
.container{max-width:var(--max);margin:0 auto;padding:0 24px;}
section{padding:64px 0;}
.section-tag{
  display:inline-block;color:var(--orange);font-weight:700;font-size:.8rem;
  letter-spacing:.08em;text-transform:uppercase;margin-bottom:10px;
}
.section-head{max-width:640px;margin:0 0 40px;}
.section-head h2{font-size:clamp(1.6rem,3vw,2.3rem);}
.section-head h2 em{color:var(--orange);font-style:normal;}

/* Botões */
.btn{
  display:inline-flex;align-items:center;gap:8px;justify-content:center;
  padding:14px 26px;border-radius:10px;font-weight:700;font-size:.95rem;
  border:2px solid transparent;cursor:pointer;transition:.2s ease;
}
.btn-primary{background:var(--orange);color:#1a1305;}
.btn-primary:hover{background:var(--orange-dark);}
.btn-outline{border-color:var(--card-border);color:var(--text);background:transparent;}
.btn-outline:hover{border-color:var(--orange);color:var(--orange);}
.btn-whatsapp{background:var(--green);color:#04220f;}
.btn-whatsapp:hover{filter:brightness(1.08);}
.btn-block{width:100%;}

/* Header / Nav */
header.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(10,14,23,.92);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--card-border);
}
.nav-wrap{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 24px;max-width:var(--max);margin:0 auto;
}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.05rem;}
.logo .mark{
  width:36px;height:36px;border-radius:9px;
  background:linear-gradient(135deg,var(--orange),var(--blue));
  display:flex;align-items:center;justify-content:center;font-size:1.1rem;
}
.logo small{display:block;font-weight:500;color:var(--text-muted);font-size:.65rem;letter-spacing:.05em;}
nav.main-nav{display:flex;gap:26px;align-items:center;}
nav.main-nav a{font-size:.92rem;font-weight:600;color:var(--text-muted);transition:.2s;}
nav.main-nav a:hover,nav.main-nav a.active{color:var(--text);}
.nav-cta{display:flex;align-items:center;gap:14px;}
.hamburger{
  display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:6px;
}
.hamburger span{width:24px;height:2px;background:var(--text);border-radius:2px;transition:.25s;}
.hamburger.open span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.hamburger.open span:nth-child(2){opacity:0;}
.hamburger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

/* Hero */
.hero{
  padding:70px 0 50px;background:
    radial-gradient(circle at 80% 0%,rgba(245,166,35,.10),transparent 55%),var(--bg);
}
.badge-pill{
  display:inline-flex;align-items:center;gap:8px;background:var(--card);
  border:1px solid var(--card-border);color:var(--orange);font-weight:700;font-size:.82rem;
  padding:8px 16px;border-radius:999px;margin-bottom:22px;
}
.hero h1{font-size:clamp(2.1rem,5vw,3.4rem);}
.hero h1 em{color:var(--orange);font-style:normal;}
.hero p.lead{font-size:1.05rem;max-width:560px;}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:22px;}

/* Cards / grids */
.grid{display:grid;gap:22px;}
.grid-2{grid-template-columns:repeat(2,1fr);}
.grid-3{grid-template-columns:repeat(3,1fr);}
.grid-4{grid-template-columns:repeat(4,1fr);}
.card{
  background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius);
  padding:26px;
}
.card .ico{font-size:1.7rem;margin-bottom:14px;}
.card h3,.card h4{font-size:1.05rem;margin-bottom:8px;}
.card p{margin-bottom:0;font-size:.92rem;}

.stat{text-align:left;}
.stat .num{font-size:2rem;font-weight:800;color:var(--orange);}
.stat .label{color:var(--text-muted);font-size:.85rem;}

/* Listas de serviços */
.service-list{list-style:none;display:grid;grid-template-columns:repeat(2,1fr);gap:10px 28px;}
.service-list li{
  padding:10px 0 10px 26px;position:relative;color:var(--text);font-size:.94rem;
  border-bottom:1px dashed var(--card-border);
}
.service-list li::before{
  content:"⚡";position:absolute;left:0;top:9px;color:var(--orange);font-size:.85rem;
}

/* Portfólio / Realizações */
.gallery{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;}
.gallery img{border-radius:10px;aspect-ratio:4/3;object-fit:cover;border:1px solid var(--card-border);}
.timeline-group{margin-bottom:34px;}
.timeline-group h3{color:var(--orange);font-size:1.05rem;border-bottom:1px solid var(--card-border);padding-bottom:10px;margin-bottom:14px;}
.timeline-group ul{list-style:none;}
.timeline-group li{
  padding:9px 0 9px 22px;position:relative;font-size:.92rem;color:var(--text-muted);
  border-bottom:1px solid rgba(255,255,255,.04);
}
.timeline-group li::before{content:"▸";position:absolute;left:0;color:var(--orange);}
.timeline-group li strong{color:var(--text);}
details.timeline-more{margin-top:10px;}
details.timeline-more summary{cursor:pointer;color:var(--orange);font-weight:700;font-size:.9rem;padding:8px 0;}

.notice{
  background:rgba(245,166,35,.08);border:1px solid rgba(245,166,35,.3);
  border-radius:var(--radius);padding:20px 24px;margin-bottom:36px;
}
.notice strong{color:var(--orange);}

/* Formulário de contato */
.form-card{background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius);padding:32px;}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.field{margin-bottom:16px;}
.field label{display:block;font-size:.85rem;font-weight:600;margin-bottom:6px;color:var(--text-muted);}
.field input,.field select,.field textarea{
  width:100%;background:var(--bg-alt);border:1px solid var(--card-border);border-radius:8px;
  padding:12px 14px;color:var(--text);font-family:var(--font);font-size:.95rem;
}
.field textarea{min-height:120px;resize:vertical;}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--orange);}
.contact-info-card{display:flex;gap:14px;padding:18px 0;border-bottom:1px solid var(--card-border);}
.contact-info-card:last-child{border-bottom:none;}
.contact-info-card .ico{font-size:1.3rem;}

/* Footer */
footer.site-footer{background:var(--bg-alt);border-top:1px solid var(--card-border);padding:56px 0 26px;margin-top:40px;}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:36px;margin-bottom:36px;}
.footer-grid h5{color:var(--text);font-size:.85rem;text-transform:uppercase;letter-spacing:.06em;margin-bottom:14px;}
.footer-grid a{display:block;color:var(--text-muted);font-size:.9rem;margin-bottom:9px;}
.footer-grid a:hover{color:var(--orange);}
.footer-bottom{
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;
  padding-top:22px;border-top:1px solid var(--card-border);color:var(--text-muted);font-size:.82rem;
}
.social-row{display:flex;gap:12px;}
.social-row a{
  width:36px;height:36px;border-radius:50%;background:var(--card);border:1px solid var(--card-border);
  display:flex;align-items:center;justify-content:center;
}

/* WhatsApp flutuante */
.wa-float{
  position:fixed;right:22px;bottom:22px;z-index:200;background:var(--green);color:#04220f;
  padding:13px 20px;border-radius:999px;font-weight:700;display:flex;align-items:center;gap:8px;
  box-shadow:0 8px 22px rgba(0,0,0,.35);
}

/* ============ RESPONSIVO ============ */
@media(max-width:980px){
  .grid-4{grid-template-columns:repeat(2,1fr);}
  .grid-3{grid-template-columns:repeat(2,1fr);}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .gallery{grid-template-columns:repeat(3,1fr);}
}

@media(max-width:760px){
  nav.main-nav{
    position:fixed;top:64px;left:0;right:0;bottom:0;background:var(--bg);
    flex-direction:column;align-items:flex-start;padding:26px 24px;gap:0;
    transform:translateX(100%);transition:transform .25s ease;overflow-y:auto;
  }
  nav.main-nav.open{transform:translateX(0);}
  nav.main-nav a{width:100%;padding:14px 0;border-bottom:1px solid var(--card-border);}
  .hamburger{display:flex;}
  .nav-cta .btn-outline{display:none;}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr;}
  .service-list{grid-template-columns:1fr;}
  .form-row{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr;}
  .gallery{grid-template-columns:repeat(2,1fr);}
  section{padding:44px 0;}
  .hero{padding:40px 0 32px;}
  .wa-float{right:14px;bottom:14px;padding:12px 16px;font-size:.85rem;}
  .footer-bottom{flex-direction:column;}
}

@media(max-width:420px){
  .gallery{grid-template-columns:repeat(2,1fr);}
  .container{padding:0 16px;}
}

.logo-badge{background:#fff;border-radius:8px;padding:4px 10px;display:inline-flex;align-items:center;}
.logo-badge img{height:28px;display:block;}
.footer-logo-badge{background:#fff;border-radius:8px;padding:6px 14px;display:inline-flex;align-items:center;margin-bottom:14px;}
.footer-logo-badge img{height:32px;display:block;}