/* Gas Kavach - Modern Stylesheet */
:root {
  --primary: #1e3a5f;
  --primary-light: #2c5282;
  --accent: #e53e3e;
  --accent-dark: #c53030;
  --gray-50: #f7fafc;
  --gray-100: #edf2f7;
  --gray-200: #e2e8f0;
  --gray-600: #718096;
  --gray-700: #4a5568;
  --gray-800: #2d3748;
  --gray-900: #1a202c;
  --white: #ffffff;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  color: var(--gray-800);
  line-height: 1.6;
  background: var(--white);
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --- HEADER / NAV --- */
header {
  background: var(--white);
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
}

.logo img {
  height: 40px;
  width: auto;
  max-width: 220px;
  display: block;
}

nav ul {
  display: flex;
  gap: 32px;
  align-items: center;
}

nav a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--gray-700);
  transition: color 0.2s;
  position: relative;
}

nav a:hover, nav a.active {
  color: var(--accent);
}

nav a.cta-btn {
  background: var(--accent);
  color: var(--white);
  padding: 10px 24px;
  border-radius: 6px;
  font-weight: 600;
  transition: background 0.2s;
}

nav a.cta-btn:hover {
  background: var(--accent-dark);
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--gray-800);
}

/* --- HERO --- */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: var(--white);
  padding: 100px 0 80px;
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: rgba(255,255,255,0.03);
  border-radius: 50%;
}

.hero-content {
  max-width: 700px;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
}

.hero h1 span { color: var(--accent); }

.hero p {
  font-size: 1.2rem;
  opacity: 0.9;
  margin-bottom: 36px;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: var(--white);
}

.btn-primary:hover { background: var(--accent-dark); transform: translateY(-1px); }

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 2px solid rgba(255,255,255,0.4);
}

.btn-outline:hover { border-color: var(--white); }

/* --- SECTIONS --- */
section { padding: 80px 0; }

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-header h2 {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 12px;
}

.section-header p {
  color: var(--gray-600);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent);
  margin-bottom: 8px;
}

/* --- STATS BAR --- */
.stats-bar {
  background: var(--gray-50);
  padding: 48px 0;
  border-bottom: 1px solid var(--gray-200);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}

.stat h3 {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--accent);
}

.stat p {
  font-size: 0.95rem;
  color: var(--gray-600);
  margin-top: 4px;
}

/* --- PRODUCT CARDS --- */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}

.product-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 12px;
  padding: 36px 28px;
  transition: all 0.3s;
}

.product-card:hover {
  box-shadow: 0 12px 40px rgba(0,0,0,0.1);
  transform: translateY(-4px);
  border-color: transparent;
}

.product-card .icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.product-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 10px;
}

.product-card p {
  color: var(--gray-600);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 16px;
}

.product-card .features {
  padding-top: 16px;
  border-top: 1px solid var(--gray-100);
}

.product-card .features li {
  font-size: 0.85rem;
  color: var(--gray-700);
  padding: 4px 0;
  padding-left: 20px;
  position: relative;
}

.product-card .features li::before {
  content: '\2713';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: bold;
}

/* --- WHY CHOOSE / FEATURES --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-item {
  text-align: center;
  padding: 32px 20px;
}

.feature-item .icon-circle {
  width: 72px;
  height: 72px;
  background: var(--gray-50);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 1.8rem;
}

.feature-item h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--gray-900);
}

.feature-item p {
  font-size: 0.9rem;
  color: var(--gray-600);
}

/* --- CLIENTS --- */
.clients-section { background: var(--gray-50); }

.clients-grid {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 48px;
  flex-wrap: wrap;
}

.clients-grid img {
  height: 60px;
  width: auto;
  filter: grayscale(100%);
  opacity: 0.6;
  transition: all 0.3s;
}

.clients-grid img:hover {
  filter: grayscale(0%);
  opacity: 1;
}

/* --- ABOUT PAGE --- */
.page-hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: var(--white);
  padding: 60px 0;
  text-align: center;
}

.page-hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
}

.page-hero p {
  opacity: 0.85;
  margin-top: 8px;
  font-size: 1.1rem;
}

.content-section { padding: 60px 0; }

.content-section h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 16px;
}

.content-section p {
  color: var(--gray-700);
  margin-bottom: 16px;
  line-height: 1.8;
}

.content-section + .content-section {
  border-top: 1px solid var(--gray-200);
}

/* --- CERTIFICATIONS --- */
.cert-badges {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  margin-top: 20px;
}

.cert-badge {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  padding: 16px 28px;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--primary);
}

/* --- CONTACT --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-info-card {
  background: var(--gray-50);
  border-radius: 12px;
  padding: 36px;
}

.contact-info-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 24px;
}

.contact-detail {
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
  align-items: flex-start;
}

.contact-detail .detail-icon {
  width: 40px;
  height: 40px;
  background: var(--primary);
  color: var(--white);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1rem;
}

.contact-detail .detail-text strong {
  display: block;
  font-size: 0.85rem;
  color: var(--gray-600);
  margin-bottom: 2px;
}

.contact-detail .detail-text span {
  font-size: 0.95rem;
  color: var(--gray-800);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-form input,
.contact-form textarea,
.contact-form select {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color 0.2s;
  background: var(--white);
}

.contact-form input:focus,
.contact-form textarea:focus,
.contact-form select:focus {
  outline: none;
  border-color: var(--primary);
}

.contact-form textarea { resize: vertical; min-height: 120px; }

.contact-form .btn { width: 100%; text-align: center; }

/* --- FOOTER --- */
footer {
  background: var(--gray-900);
  color: var(--gray-200);
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-col h4 {
  color: var(--white);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.footer-col p {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--gray-600);
}

.footer-col a {
  display: block;
  font-size: 0.9rem;
  color: var(--gray-600);
  padding: 4px 0;
  transition: color 0.2s;
}

.footer-col a:hover { color: var(--white); }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 20px 0;
  text-align: center;
  font-size: 0.85rem;
  color: var(--gray-600);
}

/* --- RESPONSIVE --- */
@media (max-width: 768px) {
  .logo img { height: 32px; max-width: 180px; }
  .mobile-toggle { display: block; }

  nav ul {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
  }

  nav ul.open { display: flex; }

  .hero { padding: 60px 0 50px; }
  .hero h1 { font-size: 2rem; }
  .hero p { font-size: 1rem; }

  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .features-grid { grid-template-columns: 1fr; }
  .products-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }

  .section-header h2 { font-size: 1.7rem; }
  section { padding: 56px 0; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-buttons { flex-direction: column; }
  .btn { text-align: center; }
}