:root {
  --primary: #E65100;
  --primary-dark: #BF360C;
  --primary-light: #FFF3E0;
  --dark: #1A1A2E;
  --dark-2: #16213E;
  --gray-900: #212529;
  --gray-800: #343A40;
  --gray-700: #495057;
  --gray-600: #6C757D;
  --gray-500: #ADB5BD;
  --gray-400: #CED4DA;
  --gray-300: #DEE2E6;
  --gray-200: #E9ECEF;
  --gray-100: #F8F9FA;
  --white: #FFFFFF;
  --green: #198754;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
  --shadow: 0 4px 12px rgba(0,0,0,.1);
  --shadow-lg: 0 8px 24px rgba(0,0,0,.12);
  --transition: .2s ease;
}

*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}

html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}

body{
  font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  font-size:16px;
  color:var(--gray-900);
  background:var(--white);
  line-height:1.6;
}

::selection{background:var(--primary);color:#fff}

img{max-width:100%;height:auto;display:block}
a{text-decoration:none;color:inherit}
ul{list-style:none}

/* ========== LAYOUT ========== */
.container{
  max-width:1140px;
  margin:0 auto;
  padding:0 1rem;
}
@media(min-width:576px){.container{padding:0 1.5rem}}

.section{padding:3.5rem 0}
@media(min-width:768px){.section{padding:4.5rem 0}}

.section-header{text-align:center;margin-bottom:2.5rem}
.section-badge{
  display:inline-block;
  padding:6px 14px;
  font-size:11px;
  font-weight:700;
  letter-spacing:1.2px;
  text-transform:uppercase;
  border-radius:50px;
  margin-bottom:10px;
}
.section-badge--primary{background:var(--primary-light);color:var(--primary)}
.section-badge--light{background:rgba(255,255,255,.1);color:rgba(255,255,255,.8);border:1px solid rgba(255,255,255,.15)}
.section-title{font-size:1.75rem;font-weight:800;line-height:1.2;margin-bottom:8px}
@media(min-width:768px){.section-title{font-size:2.25rem}}
.section-desc{font-size:.9375rem;color:var(--gray-600);max-width:560px;margin:0 auto}

/* ========== GRID ========== */
.grid{display:grid;gap:1rem}
.grid-2{grid-template-columns:1fr}
.grid-3{grid-template-columns:1fr}
.grid-4{grid-template-columns:repeat(2,1fr)}
.grid-5{grid-template-columns:repeat(2,1fr)}
@media(min-width:768px){
  .grid-2{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(3,1fr)}
  .grid-4{grid-template-columns:repeat(4,1fr)}
  .grid-5{grid-template-columns:repeat(5,1fr)}
}

/* ========== BUTTONS ========== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:10px 20px;font-size:14px;font-weight:600;
  border-radius:var(--radius);border:1px solid transparent;
  cursor:pointer;transition:all var(--transition);white-space:nowrap;
}
.btn-primary{background:var(--primary);color:#fff;border-color:var(--primary)}
.btn-primary:hover{background:var(--primary-dark);border-color:var(--primary-dark)}
.btn-dark{background:var(--gray-900);color:#fff;border-color:var(--gray-900)}
.btn-dark:hover{background:var(--gray-800)}
.btn-outline{background:transparent;color:var(--primary);border-color:var(--primary)}
.btn-outline:hover{background:var(--primary);color:#fff}
.btn-outline-light{background:transparent;color:#fff;border-color:rgba(255,255,255,.4)}
.btn-outline-light:hover{background:rgba(255,255,255,.1);border-color:#fff}
.btn-lg{padding:12px 24px;font-size:15px}
.btn-sm{padding:7px 14px;font-size:13px}

/* ========== CARD ========== */
.card{
  background:var(--white);
  border:1px solid var(--gray-300);
  border-radius:var(--radius-lg);
  overflow:hidden;
  transition:box-shadow var(--transition),transform var(--transition);
}
.card:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.card-img{width:100%;height:200px;object-fit:cover}
.card-body{padding:1.25rem}
.card-tag{
  display:inline-flex;align-items:center;gap:6px;
  font-size:12px;font-weight:700;text-transform:uppercase;
  letter-spacing:.5px;color:var(--primary);margin-bottom:8px;
}
.card-title{font-size:1.125rem;font-weight:700;margin-bottom:6px}
.card-text{font-size:.875rem;color:var(--gray-600);line-height:1.6}
.card-link{
  display:flex;align-items:center;justify-content:space-between;
  padding-top:12px;margin-top:12px;border-top:1px solid var(--gray-200);
  font-size:.8125rem;font-weight:600;color:var(--primary);
}
.card-link svg{transition:transform var(--transition)}
.card:hover .card-link svg{transform:translateX(4px)}

/* Horizontal card */
.card-horizontal{display:flex;flex-direction:column}
.card-horizontal .card-img{height:180px}
@media(min-width:576px){
  .card-horizontal{flex-direction:row}
  .card-horizontal .card-img{width:200px;height:auto;min-height:180px}
  .card-horizontal .card-body{flex:1}
}

/* ========== ICON BOX ========== */
.icon-box{
  width:44px;height:44px;border-radius:var(--radius);
  display:flex;align-items:center;justify-content:center;flex-shrink:0;
}
.icon-box--primary{background:var(--primary-light);color:var(--primary)}
.icon-box--dark{background:rgba(255,255,255,.1);color:rgba(255,148,61,1)}
.icon-box--green{background:#D1FAE5;color:var(--green)}

/* ========== HEADER ========== */
.header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  background:var(--white);border-bottom:1px solid var(--gray-300);
  transition:box-shadow var(--transition);
}
.header.scrolled{box-shadow:var(--shadow-sm)}
.header .container{display:flex;align-items:center;justify-content:space-between;height:64px}
.header-brand{display:flex;align-items:center;gap:10px}
.header-brand-icon{
  width:36px;height:36px;background:var(--primary);border-radius:var(--radius);
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-weight:800;font-size:18px;
}
.header-brand-text h1{font-size:15px;font-weight:700;line-height:1.2}
.header-brand-text span{font-size:11px;color:var(--gray-600)}
.header-nav{display:none;align-items:center;gap:28px}
.header-nav a{font-size:14px;font-weight:500;color:var(--gray-700);transition:color var(--transition)}
.header-nav a:hover{color:var(--primary)}
@media(min-width:768px){.header-nav{display:flex}}
.header-toggle{
  display:flex;align-items:center;justify-content:center;
  width:40px;height:40px;border:1px solid var(--gray-300);
  border-radius:var(--radius);background:none;cursor:pointer;color:var(--gray-700);
}
@media(min-width:768px){.header-toggle{display:none}}

/* Mobile menu */
.mobile-menu{
  position:fixed;inset:0;background:var(--white);z-index:200;
  display:flex;flex-direction:column;transform:translateX(100%);
  transition:transform .3s ease;
}
.mobile-menu.open{transform:translateX(0)}
.mobile-menu-header{
  display:flex;align-items:center;justify-content:space-between;
  padding:16px;border-bottom:1px solid var(--gray-200);
}
.mobile-menu-close{background:none;border:none;cursor:pointer;color:var(--gray-600);padding:8px}
.mobile-menu nav{padding:16px;flex:1}
.mobile-menu nav a{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 12px;font-size:16px;font-weight:500;color:var(--gray-800);
  border-bottom:1px solid var(--gray-100);
}
.mobile-menu-footer{padding:16px;border-top:1px solid var(--gray-200)}
.mobile-menu-footer .btn{width:100%}

/* ========== HERO ========== */
.hero{
  position:relative;min-height:88vh;display:flex;align-items:center;
  background:var(--dark);padding-top:64px;overflow:hidden;
}
.hero-bg{
  position:absolute;inset:0;
  background:url('/images/hero.jpg') center/cover no-repeat;
  opacity:.25;
}
.hero-overlay{
  position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(26,26,46,.5) 0%,rgba(26,26,46,.85) 100%);
}
.hero-content{position:relative;z-index:2;max-width:600px;padding:3rem 0}
.hero-content .section-badge{margin-bottom:16px}
.hero-content h2{font-size:2rem;font-weight:800;color:#fff;line-height:1.15;margin-bottom:12px}
.hero-content h2 em{font-style:normal;color:#FF8A50}
@media(min-width:768px){.hero-content h2{font-size:2.75rem}}
@media(min-width:1024px){.hero-content h2{font-size:3.25rem}}
.hero-content p{font-size:1rem;color:rgba(255,255,255,.7);margin-bottom:24px;line-height:1.7}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:28px}
.hero-features{display:flex;flex-wrap:wrap;gap:16px;padding-top:20px;border-top:1px solid rgba(255,255,255,.1)}
.hero-features span{display:flex;align-items:center;gap:8px;font-size:13px;color:rgba(255,255,255,.65)}
.hero-features svg{color:#FF8A50}

/* ========== TRUST STRIP ========== */
.trust-strip{background:var(--white);border-bottom:1px solid var(--gray-200);padding:16px 0}
.trust-item{display:flex;align-items:center;gap:12px;padding:6px 0}
.trust-item h4{font-size:13px;font-weight:600;color:var(--gray-900)}
.trust-item p{font-size:11px;color:var(--gray-600)}

/* ========== PROBLEM SECTION ========== */
.problem-item{
  display:flex;align-items:flex-start;gap:12px;
  padding:14px;background:var(--gray-100);
  border:1px solid var(--gray-200);border-radius:var(--radius);
  transition:border-color var(--transition);
}
.problem-item:hover{border-color:var(--primary)}
.problem-item h4{font-size:14px;font-weight:600}
.problem-item p{font-size:12px;color:var(--gray-600);margin-top:2px}

/* Solution card */
.solution-card{
  background:var(--dark);color:#fff;border-radius:var(--radius-lg);
  padding:28px;height:100%;display:flex;flex-direction:column;
}
.solution-card h3{font-size:1.25rem;font-weight:700;margin-bottom:10px;color:#fff}
.solution-card p{font-size:14px;color:rgba(255,255,255,.7);margin-bottom:20px;line-height:1.7}
.solution-card .check-list{margin-bottom:24px}
.solution-card .check-list li{
  display:flex;align-items:center;gap:10px;
  font-size:14px;color:rgba(255,255,255,.85);margin-bottom:10px;
}
.solution-card .check-list li svg{color:#FF8A50;flex-shrink:0}
.solution-card-footer{display:flex;gap:10px;padding-top:16px;border-top:1px solid rgba(255,255,255,.1);margin-top:auto}
.solution-card-footer .btn{flex:1}

/* ========== GAS SPRING SECTION ========== */
.gas-section{background:var(--dark);color:#fff}
.gas-card{
  text-align:center;padding:24px 16px;
  background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);
  border-radius:var(--radius-lg);transition:all var(--transition);
}
.gas-card:hover{background:rgba(255,255,255,.08);border-color:rgba(255,148,61,.3)}
.gas-card h3{font-size:14px;font-weight:700;color:#fff;margin:8px 0 4px}
.gas-card p{font-size:12px;color:rgba(255,255,255,.5)}

/* ========== WHY US ========== */
.why-img{
  position:relative;border-radius:var(--radius-lg);overflow:hidden;
  aspect-ratio:4/3;
}
.why-img img{width:100%;height:100%;object-fit:cover}
.why-img-badge{
  position:absolute;bottom:16px;left:16px;
  background:var(--white);padding:12px 16px;border-radius:var(--radius);
  box-shadow:var(--shadow);display:flex;align-items:center;gap:12px;
}
.why-img-badge .num{
  width:40px;height:40px;background:var(--primary);border-radius:var(--radius);
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-weight:800;font-size:16px;
}
.why-img-badge h4{font-size:13px;font-weight:700}
.why-img-badge p{font-size:11px;color:var(--gray-600)}
.why-list li{display:flex;align-items:flex-start;gap:10px;margin-bottom:12px;font-size:14px;color:var(--gray-700)}

/* ========== GALLERY ========== */
.gallery-item{
  position:relative;border-radius:var(--radius);overflow:hidden;
  aspect-ratio:4/3;cursor:pointer;border:1px solid var(--gray-200);
}
.gallery-item img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease}
.gallery-item:hover img{transform:scale(1.05)}
.gallery-item .overlay{
  position:absolute;inset:0;background:rgba(0,0,0,0);
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  transition:background var(--transition);
}
.gallery-item:hover .overlay{background:rgba(0,0,0,.45)}
.gallery-item .overlay span{color:#fff;font-weight:600;font-size:14px;opacity:0;transition:opacity var(--transition)}
.gallery-item:hover .overlay span{opacity:1}

/* Lightbox */
.lightbox{
  position:fixed;inset:0;z-index:300;background:rgba(0,0,0,.92);
  display:flex;align-items:center;justify-content:center;padding:24px;
  opacity:0;pointer-events:none;transition:opacity .3s ease;
}
.lightbox.active{opacity:1;pointer-events:auto}
.lightbox img{max-width:90vw;max-height:85vh;object-fit:contain;border-radius:var(--radius)}
.lightbox-close{
  position:absolute;top:20px;right:20px;
  width:44px;height:44px;border-radius:50%;background:rgba(255,255,255,.1);
  border:none;cursor:pointer;color:#fff;display:flex;align-items:center;justify-content:center;
}
.lightbox-close:hover{background:rgba(255,255,255,.2)}

/* ========== FAQ ACCORDION ========== */
.accordion{
  border:1px solid var(--gray-300);border-radius:var(--radius-lg);overflow:hidden;
  max-width:720px;margin:0 auto;
}
.accordion-item{border-bottom:1px solid var(--gray-200)}
.accordion-item:last-child{border-bottom:none}
.accordion-btn{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:16px 20px;background:none;border:none;cursor:pointer;text-align:left;
  font-size:14px;font-weight:600;color:var(--gray-900);transition:background var(--transition);
}
.accordion-btn:hover{background:var(--gray-100)}
.accordion-btn.active{background:var(--gray-100)}
.accordion-btn svg{color:var(--gray-500);transition:transform .2s ease;flex-shrink:0}
.accordion-btn.active svg{transform:rotate(180deg)}
.accordion-body{
  max-height:0;overflow:hidden;transition:max-height .3s ease;
}
.accordion-body-inner{padding:0 20px 16px;font-size:14px;color:var(--gray-600);line-height:1.7}

/* ========== CTA ========== */
.cta{background:var(--dark);color:#fff;text-align:center}
.cta .section-title{color:#fff}
.cta .section-desc{color:rgba(255,255,255,.65)}
.cta-buttons{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-top:24px;margin-bottom:32px}
.cta-info{
  display:grid;grid-template-columns:1fr;gap:12px;
  max-width:640px;margin:0 auto;padding-top:24px;border-top:1px solid rgba(255,255,255,.1);
}
@media(min-width:576px){.cta-info{grid-template-columns:repeat(3,1fr)}}
.cta-info-item{text-align:left;padding:16px;background:rgba(255,255,255,.04);border-radius:var(--radius)}
.cta-info-item h4{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.5px;color:#fff;margin-bottom:6px;display:flex;align-items:center;gap:8px}
.cta-info-item h4 svg{color:#FF8A50}
.cta-info-item p{font-size:12px;color:rgba(255,255,255,.55);line-height:1.5}

/* ========== FOOTER ========== */
.footer{background:var(--gray-900);color:var(--gray-500);border-top:1px solid rgba(255,255,255,.05)}
.footer .container{padding-top:2.5rem;padding-bottom:2.5rem}
.footer-grid{display:grid;grid-template-columns:1fr;gap:2rem}
@media(min-width:576px){.footer-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:768px){.footer-grid{grid-template-columns:2fr 1fr 1fr 1.5fr}}
.footer h3{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:1px;color:var(--white);margin-bottom:12px}
.footer-brand h2{font-size:15px;font-weight:700;color:var(--white);margin-bottom:8px}
.footer-brand p{font-size:13px;line-height:1.6}
.footer ul li{margin-bottom:8px}
.footer ul li a{font-size:13px;transition:color var(--transition)}
.footer ul li a:hover{color:var(--white)}
.footer-contact li{display:flex;align-items:flex-start;gap:8px;margin-bottom:10px;font-size:13px}
.footer-contact li svg{color:#FF8A50;flex-shrink:0;margin-top:2px}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.08);margin-top:2rem;padding-top:1.5rem;
  display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;
  font-size:12px;
}
.footer-bottom-links{display:flex;gap:16px}
.footer-bottom-links a:hover{color:var(--white)}

/* ========== WHATSAPP FAB ========== */
.whatsapp-fab{
  position:fixed;bottom:24px;right:24px;z-index:90;
  display:flex;align-items:center;gap:8px;
  background:#25D366;color:#fff;padding:12px 20px;
  border-radius:50px;font-size:14px;font-weight:600;
  box-shadow:0 4px 16px rgba(37,211,102,.35);
  transition:all var(--transition);
}
.whatsapp-fab:hover{transform:translateY(-3px);box-shadow:0 8px 24px rgba(37,211,102,.45)}
.whatsapp-fab svg{width:20px;height:20px}

/* ========== COOKIE BANNER ========== */
.cookie-banner{
  position:fixed;bottom:0;left:0;right:0;z-index:80;
  background:var(--white);border-top:1px solid var(--gray-300);
  padding:16px;box-shadow:0 -4px 12px rgba(0,0,0,.08);
  transform:translateY(100%);transition:transform .4s ease;
}
.cookie-banner.show{transform:translateY(0)}
.cookie-banner .container{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px}
.cookie-banner p{font-size:13px;color:var(--gray-700);flex:1;min-width:200px}
.cookie-banner p a{color:var(--primary);text-decoration:underline}
.cookie-banner-actions{display:flex;gap:8px}

/* ========== RESPONSIVE ========== */
@media(max-width:767px){
  .section-title{font-size:1.5rem}
  .hero-content h2{font-size:1.75rem}
  .solution-card{margin-top:1rem}
  .d-md-flex{display:block!important}
}