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

html {
  scroll-behavior: smooth;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  background: #151515;
  color: #ffffff;
  line-height: 1.6;
}

img {
  width: 100%;
  display: block;
}

a {
  text-decoration: none;
  color: inherit;
}

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

/* HEADER */

.header {
  background: #101010;
  border-bottom: 1px solid #2b2b2b;
  position: sticky;
  top: 0;
  z-index: 20;
}

.nav {
  height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 0.2px;
}

.logo-img {
  width: 38px;
  height: 38px;
  object-fit: contain;
}

.nav-btn {
  background: #e34b2f;
  color: #ffffff;
  padding: 10px 22px;
  border-radius: 7px;
  font-weight: 800;
  transition: 0.2s ease;
}

.nav-btn:hover {
  background: #ff5a3d;
}

/* HERO */

.hero {
  min-height: 560px;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("images/hero-heating.jpg");
  background-size: cover;
  background-position: center;
  filter: blur(3px);
  transform: scale(1.04);
  z-index: 1;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(10, 10, 10, 0.62);
  z-index: 2;
}

.hero-content {
  position: relative;
  z-index: 3;
  text-align: center;
  max-width: 920px;
}

.hero h1 {
  font-size: clamp(38px, 6vw, 72px);
  line-height: 1.05;
  margin-bottom: 22px;
  letter-spacing: -1px;
  color: #ffffff;
  text-shadow:
    -1px -1px 0 rgba(0,0,0,0.55),
     1px -1px 0 rgba(0,0,0,0.55),
    -1px  1px 0 rgba(0,0,0,0.55),
     1px  1px 0 rgba(0,0,0,0.55),
     0 8px 24px rgba(0,0,0,0.65);
}

.hero p {
  color: #eeeeee;
  font-size: clamp(18px, 2.3vw, 23px);
  max-width: 780px;
  margin: 0 auto;
  text-shadow:
    0 2px 8px rgba(0,0,0,0.8),
    0 0 1px rgba(0,0,0,0.9);
}

/* GENERAL SECTIONS */

.services,
.gallery,
.contact {
  padding: 66px 0;
}

.services {
  background: #1f1f1f;
}

.gallery {
  background: #171717;
}

.contact {
  background: #1f1f1f;
}

.section-heading {
  color: #e34b2f;
  font-size: clamp(32px, 4vw, 46px);
  line-height: 1.1;
  margin-bottom: 30px;
  font-weight: 900;
}

/* SERVICES */

.service-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.service-card {
  background: #242424;
  border: 1px solid #343434;
  border-top: 4px solid #e34b2f;
  border-radius: 14px;
  padding: 25px;
  min-height: 180px;
  box-shadow: 0 14px 34px rgba(0,0,0,0.22);
}

.service-card h3 {
  font-size: 20px;
  line-height: 1.25;
  margin-bottom: 12px;
}

.service-card p {
  color: #c8c8c8;
  font-size: 15px;
}

/* GALLERY */

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

.gallery-grid img {
  height: 240px;
  object-fit: cover;
  border-radius: 14px;
  border: 1px solid #333333;
  filter: brightness(0.92);
}

/* CONTACT */

.contact-card {
  background: #242424;
  border: 1px solid #343434;
  border-radius: 16px;
  padding: 24px 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  box-shadow: 0 14px 34px rgba(0,0,0,0.22);
}

.contact-info p {
  color: #d2d2d2;
  margin-bottom: 6px;
  font-size: 17px;
}

.contact-info p:last-child {
  margin-bottom: 0;
}

.contact-info strong {
  color: #ffffff;
  font-size: 20px;
}

.contact-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.contact-btn {
  background: #e34b2f;
  color: #ffffff;
  padding: 13px 22px;
  border-radius: 8px;
  font-weight: 900;
  white-space: nowrap;
  transition: 0.2s ease;
}

.contact-btn:hover {
  background: #ff5a3d;
}

.secondary-call {
  background: transparent;
  border: 1px solid #e34b2f;
}

.secondary-call:hover {
  background: #e34b2f;
}

/* FOOTER */

.footer {
  background: #0d0d0d;
  color: #9a9a9a;
  padding: 24px 0;
  text-align: center;
  font-size: 14px;
}

/* RESPONSIVE */

@media (max-width: 950px) {
  .service-grid,
  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero {
    min-height: 470px;
  }
}

@media (max-width: 620px) {
  .nav {
    height: 68px;
  }

  .brand {
    font-size: 19px;
    gap: 9px;
  }

  .logo-img {
    width: 32px;
    height: 32px;
  }

  .nav-btn {
    padding: 9px 16px;
  }

  .hero {
    min-height: 430px;
  }

  .services,
  .gallery,
  .contact {
    padding: 50px 0;
  }

  .service-grid,
  .gallery-grid {
    grid-template-columns: 1fr;
  }

  .service-card {
    min-height: auto;
  }

  .gallery-grid img {
    height: 220px;
  }

 .contact-card {
  padding: 22px;
  flex-direction: column;
  align-items: flex-start;
}

.contact-buttons {
  width: 100%;
  flex-direction: column;
  gap: 10px;
}

.contact-btn {
  width: 100%;
  text-align: center;
}
}
/* SLIDER */

.slider-wrapper {
  position: relative;
  overflow: hidden;
}

.slider {
  display: flex;
  gap: 16px;
  overflow-x: auto;
  scroll-behavior: smooth;
  padding-bottom: 10px;
}

.slider::-webkit-scrollbar {
  display: none;
}

.slider img {
  flex: 0 0 calc(25% - 12px);
  height: 220px;
  object-fit: cover;
  border-radius: 12px;
  cursor: pointer;
  transition: 0.3s ease;
  border: 1px solid #333;
}

.slider img:hover {
  transform: scale(1.05);
}

/* BUTTONS */

.slider-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(0,0,0,0.6);
  border: none;
  color: #fff;
  font-size: 28px;
  padding: 10px 16px;
  cursor: pointer;
  border-radius: 6px;
  z-index: 5;
}

.slider-btn.left {
  left: 10px;
}

.slider-btn.right {
  right: 10px;
}

/* LIGHTBOX */

.lightbox {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.92);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.lightbox img {
  width: auto;
  height: auto;
  max-width: 90vw;
  max-height: 85vh;
  object-fit: contain;
  border-radius: 12px;
}


.lightbox .close {
  position: absolute;
  top: 25px;
  right: 35px;
  font-size: 40px;
  color: white;
  cursor: pointer;
}

/* RESPONSIVE */

@media (max-width: 900px) {
  .slider img {
    flex: 0 0 calc(50% - 12px);
  }
}

@media (max-width: 600px) {
  .slider img {
    flex: 0 0 100%;
  }
}
.lightbox-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(0,0,0,0.55);
  border: 1px solid #444;
  color: white;
  font-size: 34px;
  padding: 12px 18px;
  cursor: pointer;
  border-radius: 8px;
  z-index: 101;
}

.lightbox-left {
  left: 30px;
}

.lightbox-right {
  right: 30px;
}

.lightbox-btn:hover {
  background: #e34b2f;
}

@media (max-width: 600px) {
  .lightbox-btn {
    font-size: 26px;
    padding: 10px 14px;
  }

  .lightbox-left {
    left: 10px;
  }

  .lightbox-right {
    right: 10px;
  }
}
.slider {
  scroll-behavior: auto;
}
.business-info {
  margin-top: 18px;
  background: #242424;
  border: 1px solid #343434;
  border-radius: 16px;
  padding: 20px 24px;
  box-shadow: 0 14px 34px rgba(0,0,0,0.18);
}

.business-info h3 {
  color: #e34b2f;
  font-size: 22px;
  margin-bottom: 10px;
}

.business-info p {
  color: #d2d2d2;
  margin-bottom: 6px;
}

.business-info p:last-child {
  margin-bottom: 0;
}