:root {
  --earth-red: #9e5c3b;           /* Terracotta brown/red */
  --clay-orange: #c97d60;         /* Clay orange */
  --sand-yellow: #f4e2d8;         /* Muted sand */
  --olive-green: #7d946d;         /* Muted olive green */
  --tan: #dbc1ac;                 /* Natural tan */
  --dark-brown: #5c4327;          /* Deep brown */
  --light-bg: #faf8f4;            /* Pale earth background */
  --white: #fff;
  --text-dark: #2c2c2c;
  --text-light: #806b57;
  --radius: 16px;
  --shadow: 0 4px 18px rgba(158,92,59,0.10);
  --shadow-hover: 0 8px 24px rgba(158,92,59,0.18);
  --transition: 0.28s cubic-bezier(.4,2,.3,1);
  --font-main: 'Poppins', Arial, sans-serif;
}

html, body {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  max-width: 100vw;
  overflow-x: hidden;
  font-family: var(--font-main);
  background: var(--light-bg);
  color: var(--text-dark);
  scroll-behavior: smooth;
}

/* ===== HEADER & NAVIGATION ===== */
header {
  position: fixed;
  top: 0; left: 0; right: 0;
  background: rgba(255,255,255,0.97);
  box-shadow: var(--shadow);
  z-index: 1000;
  transition: background .25s, box-shadow .25s;
}
.nav-flex {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 74px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2vw;
}
.logo {
  display: flex; align-items: center; gap: 12px;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--earth-red);
  text-decoration: none;
  letter-spacing: 1px;
}
.logo img {
  height: 38px; width: 38px; object-fit: contain;
  border-radius: 8px;
  background: var(--sand-yellow);
  box-shadow: 0 2px 7px rgba(158,92,59,0.09);
}
.logo-accent {
  color: var(--olive-green);
  font-weight: 800;
}
.nav {
  display: flex;
  gap: 30px;
}
.nav a {
  color: var(--dark-brown);
  text-decoration: none;
  font-weight: 600;
  font-size: 1.08rem;
  padding: 7px 0;
  position: relative;
  transition: color .18s;
}
.nav a::after {
  content: '';
  display: block;
  position: absolute;
  left: 0; bottom: -3px;
  width: 100%; height: 2px;
  background: var(--olive-green);
  border-radius: 2px;
  transform: scaleX(0);
  transition: transform .28s cubic-bezier(.4,2,.3,1);
  transform-origin: right;
}
.nav a:hover, .nav a:focus { color: var(--olive-green);}
.nav a:hover::after, .nav a:focus::after {
  transform: scaleX(1);
  transform-origin: left;
}
.hamburger {
  display: none;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
}
.hamburger span {
  width: 27px;
  height: 3px;
  border-radius: 2px;
  background: var(--olive-green);
  display: block;
}
@media (max-width: 900px) {
  .nav {
    position: fixed;
    right: 0; top: 0;
    height: 100vh;
    background: var(--white);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    width: 210px;
    transform: translateX(100%);
    transition: transform .33s cubic-bezier(.4,2,.3,1);
    padding: 78px 20px 0 20px;
    box-shadow: -1px 0 10px rgba(158,92,59,0.13);
    z-index: 1001;
  }
  .nav.active { transform: translateX(0);}
  .nav a { padding: 17px 0; font-size: 1.12rem;}
  .hamburger { display: flex; z-index: 1002;}
}

/* ===== HERO SECTION (SLIDER) ===== */
.hero {
  position: relative;
  min-height: 470px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 74px;
  overflow: hidden;
  background: var(--light-bg);
}
.hero-slider {
  position: absolute;
  inset: 0;
  z-index: 1;
}
.hero-slide {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0;
  transition: opacity 0.9s var(--transition);
  will-change: opacity;
}
.hero-slide.active { opacity: 1; z-index: 2;}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(158,92,59,0.23) 65%, rgba(125,148,109,0.13) 100%);
  z-index: 3;
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 4;
  text-align: center;
  margin: auto;
  padding: 70px 14px 80px;
  background: rgba(255,255,255,0.6);
  border-radius: var(--radius);
  box-shadow: 0 8px 32px rgba(158,92,59,0.13);
  max-width: 670px;
  animation: fadeInUp 1.2s cubic-bezier(.4,2,.3,1);
}
.hero-content h1 {
  font-size: 2.3rem;
  color: var(--earth-red);
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: 1px;
}
.hero-content h1 span { color: var(--olive-green); font-weight: 700; }
.hero-content p {
  font-size: 1.11rem;
  color: var(--dark-brown);
  margin-bottom: 28px;
}
.btn, .btn-primary {
  display: inline-block;
  font-size: 1.08rem;
  font-weight: 600;
  border: none;
  border-radius: 9px;
  text-decoration: none;
  box-shadow: var(--shadow);
  padding: 15px 38px;
  transition: background var(--transition), color var(--transition), transform var(--transition);
  cursor: pointer;
  background: var(--earth-red);
  color: #fff;
}
.btn-primary:hover, .btn-primary:focus {
  background: var(--olive-green);
  color: var(--white);
  transform: translateY(-2px) scale(1.04);
}
@keyframes fadeInUp {
  0% { opacity: 0; transform: translateY(40px);}
  100% { opacity: 1; transform: none;}
}

/* ===== SECTIONS AND LAYOUT ===== */
.section {
  padding: 64px 0;
}
.container {
  width: 100%;
  max-width: 1250px;
  margin: 0 auto;
  padding-left: 5vw;
  padding-right: 5vw;
}
@media (max-width: 700px) {
  .container { padding-left: 2vw; padding-right: 2vw; }
  .section { padding: 36px 0; }
}

/* ===== ABOUT SECTION ===== */
.about-flex {
  display: flex;
  gap: 48px;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}
.about-img { flex: 1; min-width: 180px; }
.about-img img {
  width: 100%; max-width: 340px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  background: var(--sand-yellow);
}
.about-text { flex: 1.2; min-width: 220px; }
.about-text h2 { color: var(--earth-red);}
.about-text p {
  font-size: 1.15rem;
  color: var(--text-light);
  margin-top: 18px;
}

/* ===== WHY WALLTECH BRICKS CSEB ===== */
.why-walltech {
  background: var(--sand-yellow);
}
.why-walltech h2 { color: var(--earth-red);}
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 28px;
  margin-top: 32px;
}
.feature-block {
  background: var(--tan);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 30px 18px 22px;
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition);
}
.feature-block:hover {
  transform: translateY(-4px) scale(1.03);
  box-shadow: var(--shadow-hover);
}
.feature-block i {
  color: var(--olive-green);
  font-size: 2.2rem;
  margin-bottom: 13px;
}
.feature-block h3 {
  color: var(--earth-red);
  font-size: 1.13rem;
  font-weight: 700;
  margin-bottom: 6px;
}
.feature-block p {
  color: var(--dark-brown);
  font-size: 1rem;
}

/* ===== VISION, MISSION, QUALITY POLICY ===== */
.vmp-cards {
  display: flex;
  gap: 34px;
  flex-wrap: wrap;
  justify-content: center;
}
.vmp-card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 38px 30px 30px;
  text-align: left;
  transition: transform var(--transition), box-shadow var(--transition);
  min-width: 230px;
  max-width: 370px;
}
.vmp-card img {
  width: 70px; height: 70px; object-fit: cover; border-radius: 10px; margin-bottom: 15px; background: var(--sand-yellow);
}
.vmp-card h3 { color: var(--earth-red); font-size: 1.18rem; margin-bottom: 8px;}
.vmp-card p, .vmp-card ul { color: var(--text-light); font-size: 1.03rem; }
.vmp-card ul { margin: 5px 0 0 20px; }

/* ===== PRODUCTS ===== */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 24px;
  margin-top: 28px;
}
.product-card {
  background: var(--tan);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 30px 18px 18px;
  text-align: center;
  color: var(--dark-brown);
  font-weight: 600;
}
.product-card h4 { color: var(--earth-red); margin: 0; font-size: 1.06rem; }

/* ===== TECHNICAL DATA & SPECIFICATIONS ===== */
#tech-specs {
  background: var(--light-bg);
}
.specs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 32px;
  margin-top: 24px;
}
.specs-col h4 { color: var(--earth-red); margin-bottom: 4px; }
.specs-col p { margin: 0 0 14px 0; color: var(--text-light); }
.process-diagram { text-align: center; }
.test-reports { display: flex; gap: 24px; justify-content: center; margin-top: 24px; flex-wrap: wrap; }
.test-reports img { border-radius: 12px; background: var(--tan); box-shadow: 0 2px 8px rgba(158,92,59,0.07); max-width: 100%; }

/* ===== FAQ ===== */
.faq-list {
  margin: 32px auto 0 auto;
  max-width: 680px;
}
.faq-item {
  margin-bottom: 17px;
  border-radius: 11px;
  box-shadow: 0 1.5px 7px rgba(158,92,59,0.08);
  background: var(--white);
  overflow: hidden;
}
.faq-question {
  width: 100%;
  text-align: left;
  padding: 16px 20px;
  background: var(--sand-yellow);
  color: var(--earth-red);
  font-size: 1.05rem;
  font-weight: 700;
  border: none;
  cursor: pointer;
  outline: none;
  transition: background var(--transition), color var(--transition);
  position: relative;
}
.faq-question::after {
  content: '+';
  float: right;
  font-size: 1.2rem;
  transition: transform .21s;
}
.faq-question.open::after {
  content: '-';
  transform: rotate(180deg);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  background: var(--light-bg);
  color: var(--dark-brown);
  font-size: 0.98rem;
  padding: 0 20px;
  transition: max-height .4s cubic-bezier(.4,2,.3,1), padding .4s;
}
.faq-question.open + .faq-answer {
  padding: 14px 20px 18px 20px;
  max-height: 300px;
}

/* ===== GALLERY ===== */
.gallery-grid {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 18px;
  margin-top: 18px;
}
.gallery-grid img {
  display: block;
  width: 100%; height: 170px; object-fit: cover;
  border-radius: 12px;
  box-shadow: 0 1px 8px 0 rgba(158,92,59,0.10);
  background: var(--sand-yellow);
  transition: transform .18s, box-shadow .18s;
  cursor: pointer;
}
.gallery-grid img:hover, .gallery-grid img:focus {
  transform: scale(1.08);
  box-shadow: var(--shadow-hover);
}

/* ===== CONTACT ===== */
.contact-flex {
  display: flex;
  gap: 38px;
  flex-wrap: wrap;
  align-items: flex-start;
  margin-top: 16px;
  justify-content: center;
}
.contact-form {
  flex: 1;
  background: var(--white);
  padding: 34px 18px 22px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 13px;
  min-width: 230px;
  align-items: center;
}
.contact-form h2 { color: var(--earth-red);}
.contact-form input,
.contact-form textarea {
  font-size: 1rem;
  padding: 10px 12px;
  border: 1.5px solid var(--sand-yellow);
  border-radius: 7px;
  background: var(--sand-yellow);
  resize: none;
  font-family: inherit;
  transition: border var(--transition);
  width: 100%;
  max-width: 320px;
  margin-bottom: 6px;
}
.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--olive-green);
  outline: none;
}
.contact-form button {
  background: var(--earth-red);
  color: #fff;
  font-weight: 600;
  font-size: 1.06rem;
  border: none;
  border-radius: 7px;
  padding: 13px 0;
  margin-top: 6px;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
  width: 100%;
  max-width: 320px;
}
.contact-form button:hover, .contact-form button:focus {
  background: var(--olive-green);
  color: var(--white);
}
.contact-info {
  flex: 1;
  min-width: 180px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
  justify-content: flex-start;
}
.contact-info div, .contact-info a {
  color: var(--dark-brown);
  font-size: 1.07rem;
  margin-bottom: 4px;
  display: block;
  text-align: left;
}
.contact-info a {
  color: var(--olive-green);
  text-decoration: none;
  font-weight: 600;
}
.contact-info a:hover { text-decoration: underline; }
.contact-info i { color: var(--earth-red); font-size: 1.15em; margin-right: 6px; }

/* ===== FOOTER ===== */
footer {
  background: var(--earth-red);
  color: #fff;
  padding: 28px 0 16px;
  font-size: 1rem;
}
.footer-content {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 22px;
  text-align: center;
}
.footer-content a {
  color: var(--sand-yellow);
  text-decoration: none;
  margin: 0 5px;
  font-weight: 500;
  transition: color .18s;
}
.footer-content a:hover { color: var(--tan); text-decoration: underline; }

/* ===== RESPONSIVE ADJUSTMENTS ===== */
@media (max-width: 1100px) {
  .about-flex, .contact-flex, .vmp-cards { flex-direction: column; gap: 20px; align-items: center; }
  .about-img { margin-bottom: 32px; }
  .test-reports { flex-direction: column; align-items: center; }
  .vmp-card { max-width: 98vw; }
}
@media (max-width: 900px) {
  .footer-content { padding: 0; }
  .specs-grid, .features-grid, .products-grid, .gallery-grid { grid-template-columns: 1fr; }
}
@media (max-width: 700px) {
  .container { padding-left: 2vw; padding-right: 2vw; }
  .section { padding: 28px 0; }
  .hero-content { padding: 14vw 2vw 10vw;}
  .about-img img { max-width: 95vw;}
}
.whatsapp-float {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: #25d366;
  color: #fff;
  border-radius: 50%;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  z-index: 2000;
  box-shadow: 0 4px 18px rgba(38, 50, 56, 0.12);
  transition: transform .17s, box-shadow .17s;
}
.whatsapp-float:hover, .whatsapp-float:focus {
  transform: scale(1.08);
  background: #128c7e;
}