:root {
  --teal-900: #12292d;
  --teal-800: #17363b;
  --teal-700: #1e454b;
  --teal-600: #2a5960;
  --red-600: #c8202f;
  --red-700: #a81726;
  --cream: #f3ead9;
  --cream-100: #faf7f0;
  --brown: #8b5a2b;
  --ink: #1c2426;
  --muted: #5b6b6e;
  --border: #e4dfd3;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(18, 41, 45, 0.08);
  --shadow-lg: 0 20px 50px rgba(18, 41, 45, 0.16);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Segoe UI', system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--cream-100);
  line-height: 1.6;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { margin: 0 0 .5em; line-height: 1.2; font-weight: 800; }
p { margin: 0 0 1em; }
ul { margin: 0; padding: 0; list-style: none; }

.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

.icon { width: 18px; height: 18px; fill: currentColor; flex-shrink: 0; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  justify-content: center;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease, color .15s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn--primary { background: var(--red-600); color: #fff; }
.btn--primary:hover { background: var(--red-700); box-shadow: 0 10px 20px rgba(200,32,47,.3); }
.btn--ghost { background: transparent; color: var(--teal-900); border-color: var(--border); }
.btn--ghost:hover { border-color: var(--teal-700); }
.btn--outline { background: transparent; color: #fff; border-color: rgba(255,255,255,.5); }
.btn--outline:hover { background: rgba(255,255,255,.12); }
.btn--lg { padding: 15px 30px; font-size: 1rem; }
.btn--block { width: 100%; }

/* ===== Top bar ===== */
.topbar { background: var(--teal-900); color: #cfe3e0; font-size: .85rem; }
.topbar__inner { display: flex; align-items: center; justify-content: space-between; padding: 8px 24px; gap: 16px; flex-wrap: wrap; }
.topbar__contact { display: flex; gap: 22px; }
.topbar__contact a { display: inline-flex; align-items: center; gap: 6px; opacity: .9; }
.topbar__contact a:hover { opacity: 1; color: var(--red-600); }
.topbar__contact .icon { width: 14px; height: 14px; }
.topbar__badge { opacity: .85; }

/* ===== Header ===== */
.header { position: sticky; top: 0; z-index: 100; background: rgba(250,247,240,.92); backdrop-filter: blur(8px); border-bottom: 1px solid var(--border); }
.header__inner { display: flex; align-items: center; justify-content: space-between; padding: 12px 24px; gap: 20px; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand__logo { width: 52px; height: 52px; border-radius: 50%; object-fit: cover; background: #fff; box-shadow: var(--shadow); }
.brand__fallback {
  display: none; width: 52px; height: 52px; border-radius: 50%;
  background: var(--red-600); color: #fff; font-weight: 800; align-items: center; justify-content: center;
  box-shadow: var(--shadow);
}
.brand__text { display: flex; flex-direction: column; line-height: 1.2; }
.brand__name { font-weight: 800; font-size: 1.15rem; color: var(--teal-900); }
.brand__slogan { font-size: .75rem; color: var(--red-600); font-weight: 700; letter-spacing: .02em; }

.nav { display: flex; gap: 28px; }
.nav a { font-weight: 600; color: var(--teal-900); font-size: .95rem; position: relative; padding: 4px 0; }
.nav a:hover { color: var(--red-600); }

.header__actions { display: flex; align-items: center; gap: 12px; }
.nav-toggle {
  display: none; flex-direction: column; justify-content: center; gap: 5px;
  width: 40px; height: 40px; background: none; border: none; cursor: pointer;
}
.nav-toggle span { width: 24px; height: 2px; background: var(--teal-900); border-radius: 2px; }

/* ===== Hero ===== */
.hero { position: relative; overflow: hidden; color: #fff; }
.hero__bg {
  position: absolute; inset: 0;
  background: linear-gradient(120deg, var(--teal-900) 0%, var(--teal-800) 55%, var(--teal-600) 100%);
}
.hero__bg::after {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(circle at 80% 20%, rgba(200,32,47,.25), transparent 45%),
              radial-gradient(circle at 10% 90%, rgba(255,255,255,.08), transparent 40%);
}
.hero__inner {
  position: relative; display: grid; grid-template-columns: 1.2fr .8fr; gap: 40px;
  align-items: center; padding: 90px 24px 80px;
}
.eyebrow { display: inline-block; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; font-size: .78rem; color: var(--red-600); margin-bottom: 10px; }
.hero .eyebrow { color: #ffb3ba; }
.eyebrow.center { display: block; text-align: center; }
.hero h1 { font-size: clamp(2rem, 4vw, 3rem); }
.hero__lead { font-size: 1.05rem; color: #dfeceb; max-width: 560px; }
.hero__ctas { display: flex; gap: 14px; flex-wrap: wrap; margin: 26px 0; }
.hero__trust { display: flex; gap: 22px; flex-wrap: wrap; font-size: .88rem; color: #cfe3e0; font-weight: 600; }
.hero__figure { display: flex; justify-content: center; }
.hero__figure img { max-width: 340px; filter: drop-shadow(0 25px 40px rgba(0,0,0,.35)); }

/* ===== Trust strip ===== */
.trust-strip { background: var(--cream); border-bottom: 1px solid var(--border); }
.trust-strip__inner { display: flex; justify-content: center; text-align: center; padding: 28px 24px; }
.trust-strip__inner div { display: flex; flex-direction: column; gap: 2px; }
.trust-strip__inner strong { font-size: 1.6rem; color: var(--teal-900); font-weight: 800; }
.trust-strip__inner span { font-size: .82rem; color: var(--muted); font-weight: 600; }

/* ===== Sections ===== */
.section { padding: 90px 0; }
.section--alt { background: var(--cream); }
.section__title { font-size: clamp(1.6rem, 3vw, 2.2rem); color: var(--teal-900); }
.section__title.center { text-align: center; max-width: 700px; margin-left: auto; margin-right: auto; }
.section__lead { color: var(--muted); text-align: center; max-width: 620px; margin: 0 auto 50px; }
.section__title.center + .section__lead { margin-top: -8px; }

/* ===== Grid / Cards ===== */
.grid { display: grid; gap: 24px; margin-top: 20px; }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px; box-shadow: var(--shadow); transition: transform .2s ease, box-shadow .2s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.card__icon {
  width: 52px; height: 52px; border-radius: 12px; background: var(--teal-900);
  display: flex; align-items: center; justify-content: center; margin-bottom: 16px;
}
.card__icon svg { width: 26px; height: 26px; fill: none; stroke: var(--red-600); stroke-width: 1.6; }
.card h3 { font-size: 1.05rem; color: var(--teal-900); }
.card p { color: var(--muted); margin: 0; font-size: .92rem; }

/* ===== Gas geyser split ===== */
.gas-split { display: grid; grid-template-columns: 1.15fr .85fr; gap: 50px; align-items: center; }
.gas-split__content h2 { max-width: 520px; }
.gas-split__content > p { color: var(--muted); max-width: 540px; }
.check-list { margin: 20px 0 28px; display: flex; flex-direction: column; gap: 12px; }
.check-list li { padding-left: 30px; position: relative; font-weight: 600; color: var(--teal-900); }
.check-list li::before {
  content: "✓"; position: absolute; left: 0; top: 0;
  width: 20px; height: 20px; border-radius: 50%; background: var(--red-600); color: #fff;
  font-size: .7rem; display: flex; align-items: center; justify-content: center;
}
.gas-split__figure { display: flex; justify-content: center; }
.gas-badge {
  width: 260px; height: 260px; border-radius: 50%; background: var(--teal-900); color: #fff;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px;
  box-shadow: var(--shadow-lg); border: 8px solid var(--cream);
  text-align: center; padding: 20px;
}
.gas-badge__num { font-size: 1.8rem; font-weight: 800; color: var(--red-600); letter-spacing: .05em; }
.gas-badge__text { font-size: .85rem; font-weight: 600; color: #dfeceb; max-width: 180px; }

/* ===== Why us / features ===== */
.feature { text-align: center; padding: 10px; }
.feature__num { font-size: 2.2rem; font-weight: 800; color: var(--border); margin-bottom: 8px; }
.feature h3 { color: var(--teal-900); font-size: 1.02rem; }
.feature p { color: var(--muted); font-size: .9rem; }

/* ===== Steps ===== */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-top: 30px; position: relative; }
.step { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 28px 22px; text-align: center; box-shadow: var(--shadow); }
.step__circle {
  width: 44px; height: 44px; border-radius: 50%; background: var(--red-600); color: #fff;
  display: flex; align-items: center; justify-content: center; font-weight: 800; margin: 0 auto 14px;
}
.step h3 { font-size: 1rem; color: var(--teal-900); }
.step p { color: var(--muted); font-size: .88rem; margin: 0; }

/* ===== Gallery ===== */
.gallery-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 20px;
}
.gallery-item {
  position: relative; padding: 0; border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; cursor: pointer; background: var(--teal-900); aspect-ratio: 4 / 3;
  box-shadow: var(--shadow); transition: transform .2s ease, box-shadow .2s ease;
}
.gallery-item:hover, .gallery-item:focus-visible { transform: translateY(-4px); box-shadow: var(--shadow-lg); outline: none; }
.gallery-item img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .3s ease; }
.gallery-item:hover img { transform: scale(1.06); }
.gallery-item::after {
  content: attr(data-caption); position: absolute; left: 0; right: 0; bottom: 0;
  padding: 20px 12px 10px; font-size: .78rem; font-weight: 700; color: #fff; text-align: left;
  background: linear-gradient(0deg, rgba(18,41,45,.85), transparent);
  opacity: 0; transform: translateY(6px); transition: opacity .2s ease, transform .2s ease;
}
.gallery-item:hover::after, .gallery-item:focus-visible::after { opacity: 1; transform: translateY(0); }

.lightbox {
  display: none; position: fixed; inset: 0; z-index: 200; background: rgba(10,20,22,.94);
  align-items: center; justify-content: center; flex-direction: column; padding: 40px 20px;
}
.lightbox.open { display: flex; }
.lightbox__img { max-width: min(90vw, 900px); max-height: 74vh; border-radius: 10px; box-shadow: 0 20px 60px rgba(0,0,0,.5); }
.lightbox__caption { color: #f3ead9; font-weight: 600; margin: 18px 0 0; text-align: center; }
.lightbox__close {
  position: absolute; top: 20px; right: 24px; width: 44px; height: 44px; border-radius: 50%;
  background: rgba(255,255,255,.1); color: #fff; border: none; font-size: 1.6rem; line-height: 1; cursor: pointer;
}
.lightbox__close:hover { background: rgba(255,255,255,.2); }
.lightbox__nav {
  position: absolute; top: 50%; transform: translateY(-50%); width: 52px; height: 52px; border-radius: 50%;
  background: rgba(255,255,255,.1); color: #fff; border: none; font-size: 2rem; line-height: 1; cursor: pointer;
}
.lightbox__nav:hover { background: rgba(255,255,255,.2); }
.lightbox__nav--prev { left: 20px; }
.lightbox__nav--next { right: 20px; }

/* ===== Reviews ===== */
.review { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow); }
.review__stars { color: var(--red-600); letter-spacing: 2px; margin-bottom: 12px; }
.review p { color: var(--ink); font-style: italic; }
.review__author { font-weight: 700; color: var(--teal-900); font-size: .9rem; }

/* ===== CTA banner ===== */
.cta-banner { background: linear-gradient(120deg, var(--red-600), var(--red-700)); color: #fff; }
.cta-banner__inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 50px 24px; flex-wrap: wrap; }
.cta-banner h2 { font-size: 1.5rem; margin-bottom: 4px; }
.cta-banner p { margin: 0; color: #ffe1e4; }
.cta-banner .btn--primary { background: #fff; color: var(--red-700); }
.cta-banner .btn--primary:hover { background: var(--cream); }

/* ===== Contact ===== */
.contact-split { display: grid; grid-template-columns: .9fr 1.1fr; gap: 60px; }
.contact-info p { color: var(--muted); }
.contact-item { display: flex; align-items: flex-start; gap: 14px; margin-bottom: 22px; }
.contact-item .icon { width: 22px; height: 22px; fill: var(--red-600); margin-top: 3px; }
.contact-item strong { display: block; color: var(--teal-900); font-size: .85rem; }
.contact-item a, .contact-item span { color: var(--muted); }
.contact-item a:hover { color: var(--red-600); }

.contact-form {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 32px; box-shadow: var(--shadow-lg);
}
.contact-form h3 { color: var(--teal-900); margin-bottom: 18px; }
.contact-form label { display: block; font-size: .85rem; font-weight: 700; color: var(--teal-900); margin-bottom: 14px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.contact-form input, .contact-form select, .contact-form textarea {
  width: 100%; margin-top: 6px; padding: 11px 14px; border: 1.5px solid var(--border);
  border-radius: 8px; font-family: inherit; font-size: .92rem; font-weight: 500; color: var(--ink); background: var(--cream-100);
}
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus {
  outline: none; border-color: var(--red-600); background: #fff;
}
.form-note { text-align: center; font-weight: 700; color: var(--teal-700); min-height: 1.2em; margin-top: 12px; }

/* ===== Footer ===== */
.footer { background: var(--teal-900); color: #cfe3e0; padding-top: 60px; }
.footer__inner { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 30px; padding-bottom: 40px; }
.footer__brand { display: flex; align-items: center; gap: 12px; }
.footer__brand img { width: 48px; height: 48px; border-radius: 50%; background: #fff; }
.footer__brand .brand__name { color: #fff; display: block; }
.footer__brand .brand__slogan { color: var(--red-600); }
.footer h4 { color: #fff; font-size: .9rem; margin-bottom: 14px; }
.footer__links, .footer__contact { display: flex; flex-direction: column; gap: 10px; font-size: .88rem; }
.footer__links a, .footer__contact a, .footer__contact span { color: #a9c2bf; }
.footer__links a:hover, .footer__contact a:hover { color: var(--red-600); }
.footer__bottom { border-top: 1px solid rgba(255,255,255,.08); }
.footer__bottom-inner { display: flex; justify-content: space-between; padding: 18px 24px; font-size: .8rem; color: #86a19e; flex-wrap: wrap; gap: 8px; }

/* ===== WhatsApp FAB / back to top ===== */
.whatsapp-fab {
  position: fixed; right: 24px; bottom: 24px; width: 58px; height: 58px; border-radius: 50%;
  background: #25D366; display: flex; align-items: center; justify-content: center;
  box-shadow: 0 10px 24px rgba(0,0,0,.25); z-index: 90; transition: transform .2s ease;
}
.whatsapp-fab svg { width: 30px; height: 30px; fill: #fff; }
.whatsapp-fab:hover { transform: scale(1.08); }
.back-to-top {
  position: fixed; right: 24px; bottom: 92px; width: 44px; height: 44px; border-radius: 50%;
  background: var(--teal-900); color: #fff; border: none; font-size: 1.1rem; cursor: pointer;
  box-shadow: 0 10px 24px rgba(0,0,0,.2); z-index: 90; opacity: 0; pointer-events: none; transition: opacity .2s ease, transform .2s ease;
}
.back-to-top.show { opacity: 1; pointer-events: auto; }
.back-to-top:hover { transform: translateY(-3px); }

/* ===== Responsive ===== */
@media (max-width: 980px) {
  .nav { display: none; }
  .header__actions .btn--ghost { display: none; }
  .nav-toggle { display: flex; }
  .hero__inner { grid-template-columns: 1fr; text-align: center; padding-top: 60px; }
  .hero__lead { margin: 0 auto; }
  .hero__ctas, .hero__trust { justify-content: center; }
  .hero__figure { order: -1; }
  .hero__figure img { max-width: 220px; }
  .grid--3, .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .gallery-grid { grid-template-columns: repeat(3, 1fr); }
  .gas-split, .contact-split { grid-template-columns: 1fr; }
  .gas-split__figure { order: -1; }
  .footer__inner { grid-template-columns: 1fr 1fr; }

  .nav {
    position: absolute; top: 100%; left: 0; right: 0; background: var(--cream-100);
    flex-direction: column; padding: 16px 24px; border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
  }
  .nav.open { display: flex; }
}
@media (max-width: 640px) {
  .topbar__inner { justify-content: center; text-align: center; }
  .topbar__badge { display: none; }
  .grid--3, .grid--4, .steps { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .lightbox__nav { width: 40px; height: 40px; font-size: 1.5rem; }
  .form-row { grid-template-columns: 1fr; }
  .cta-banner__inner { flex-direction: column; text-align: center; }
  .footer__inner { grid-template-columns: 1fr; text-align: center; }
  .footer__brand { justify-content: center; }
  .footer__bottom-inner { flex-direction: column; text-align: center; }
}