/* ============================================
   Minglong Solar - Professional Solar Lighting
   Stylesheet
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  --primary: #0a6b3c;
  --primary-dark: #064a2a;
  --primary-light: #0d8c4e;
  --secondary: #1a3a5c;
  --secondary-light: #2a5a8c;
  --accent: #f5a623;
  --accent-light: #ffc857;
  --dark: #1a1a2e;
  --dark-gray: #2d2d44;
  --text: #333333;
  --text-light: #666666;
  --bg-light: #f8f9fa;
  --bg-white: #ffffff;
  --border: #e0e0e0;
  --gradient-hero: linear-gradient(135deg, #0a6b3c 0%, #1a3a5c 50%, #0a6b3c 100%);
  --gradient-card: linear-gradient(135deg, #f8f9fa 0%, #e8f5e9 100%);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.12);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.16);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all 0.3s ease;
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --container: 1200px;
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  color: var(--text);
  line-height: 1.7;
  background: var(--bg-white);
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

ul {
  list-style: none;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 100px 0;
}

.section-dark {
  background: var(--dark);
  color: #fff;
}

.section-light {
  background: var(--bg-light);
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  font-weight: 700;
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: 15px;
  color: var(--dark);
  text-align: center;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-light);
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px;
  line-height: 1.6;
}

.section-dark .section-title {
  color: #fff;
}

.section-dark .section-subtitle {
  color: rgba(255,255,255,0.7);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  font-family: var(--font-primary);
}

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

.btn-primary:hover {
  background: var(--primary-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(10,107,60,0.35);
}

.btn-secondary {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,0.4);
}

.btn-secondary:hover {
  border-color: #fff;
  background: rgba(255,255,255,0.1);
  transform: translateY(-2px);
}

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

.btn-accent:hover {
  background: var(--accent-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(245,166,35,0.35);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}

.btn-outline:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-2px);
}

.btn-sm {
  padding: 10px 24px;
  font-size: 0.9rem;
}

/* --- Header / Navbar --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.98);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.header.scrolled {
  box-shadow: var(--shadow-sm);
  background: rgba(255,255,255,0.98);
  backdrop-filter: blur(10px);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  height: 72px;
  max-width: var(--container);
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--gradient-hero);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.2rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

/* --- Language Switcher --- */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: 8px;
  border-left: 1px solid var(--border);
  padding-left: 16px;
}

.lang-switch-btn {
  background: none;
  border: 1.5px solid var(--border);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font-primary);
  color: var(--text-light);
}

.lang-switch-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.lang-switch-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
  padding: 4px 0;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: var(--transition);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-links a:hover {
  color: var(--primary);
}

.nav-links .btn {
  margin-left: 8px;
}

/* Hamburger (mobile) */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 5px;
  background: none;
  border: none;
}

.hamburger span {
  width: 25px;
  height: 2px;
  background: var(--dark);
  transition: var(--transition);
  border-radius: 2px;
}

/* --- Hero Section --- */
.hero {
  padding: 140px 0 100px;
  background: var(--gradient-hero);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: rgba(255,255,255,0.03);
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: rgba(255,255,255,0.02);
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-content h1 {
  font-size: 3.2rem;
  font-weight: 800;
  margin-bottom: 20px;
  line-height: 1.2;
}

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

.hero-content p {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.85);
  margin-bottom: 35px;
  max-width: 500px;
  line-height: 1.7;
}

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

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 50px;
}

.hero-stat {
  padding: 20px;
  background: rgba(255,255,255,0.08);
  border-radius: var(--radius);
  backdrop-filter: blur(5px);
  border: 1px solid rgba(255,255,255,0.1);
  text-align: center;
}

.hero-stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  display: block;
}

.hero-stat-label {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.7);
  margin-top: 5px;
}

.hero-image {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-image img {
  width: 100%;
  border-radius: var(--radius);
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.hero-image img:hover {
  transform: scale(1.02);
  transition: transform 0.3s ease;
}

.hero-image-placeholder {
  width: 100%;
  aspect-ratio: 4/3;
  background: rgba(255,255,255,0.08);
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,0.15);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.6);
  font-size: 3rem;
  gap: 15px;
  text-align: center;
}

.hero-image-placeholder span {
  font-size: 1rem;
  max-width: 280px;
  line-height: 1.5;
}

/* --- Features / Why Us --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

.feature-card {
  text-align: center;
  padding: 40px 25px;
  background: var(--bg-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid var(--border);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.feature-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: linear-gradient(135deg, #e8f5e9, #c8e6c9);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 1.5rem;
}

.feature-card h3 {
  font-size: 1.15rem;
  margin-bottom: 12px;
  color: var(--dark);
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-light);
  line-height: 1.6;
}

/* --- Products Section --- */
.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.product-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid var(--border);
}

.product-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.product-card-image {
  height: 240px;
  background: linear-gradient(135deg, #e8f5e9, #f1f8f9);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: var(--primary);
}

.product-card-body {
  padding: 25px;
}

.product-card-category {
  font-size: 0.8rem;
  color: var(--primary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.product-card-body h3 {
  font-size: 1.15rem;
  margin: 8px 0 12px;
  color: var(--dark);
}

.product-card-body p {
  font-size: 0.9rem;
  color: var(--text-light);
  margin-bottom: 15px;
  line-height: 1.6;
}

.product-specs {
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
  margin-bottom: 15px;
}

.product-spec {
  font-size: 0.8rem;
  background: var(--bg-light);
  padding: 4px 12px;
  border-radius: 20px;
  color: var(--text-light);
}

/* --- Projects Section --- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.project-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid var(--border);
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.project-card-image {
  height: 200px;
  background: linear-gradient(135deg, #1a3a5c, #2a5a8c);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: rgba(255,255,255,0.3);
}

.project-card-body {
  padding: 25px;
}

.project-card-body h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
  color: var(--dark);
}

.project-card-body p {
  font-size: 0.9rem;
  color: var(--text-light);
  margin-bottom: 10px;
}

.project-tag {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--primary);
  background: #e8f5e9;
  padding: 3px 12px;
  border-radius: 20px;
  font-weight: 500;
}

/* --- About Preview Section --- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-image {
  aspect-ratio: 4/3;
  background: linear-gradient(135deg, #e8f5e9, #c8e6c9);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: var(--primary);
}

.about-content h2 {
  font-size: 2.2rem;
  margin-bottom: 20px;
  color: var(--dark);
}

.about-content p {
  font-size: 1rem;
  color: var(--text-light);
  line-height: 1.8;
  margin-bottom: 20px;
}

.about-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 15px;
  margin: 25px 0;
}

.about-feature {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
}

.about-feature-icon {
  color: var(--primary);
  font-weight: bold;
}

/* --- CTA Section --- */
.cta-section {
  background: var(--gradient-hero);
  padding: 80px 0;
  text-align: center;
  color: #fff;
}

.cta-section h2 {
  font-size: 2.3rem;
  margin-bottom: 15px;
}

.cta-section p {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.8);
  max-width: 600px;
  margin: 0 auto 35px;
}

.cta-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* --- Certifications --- */
.certs-grid {
  display: flex;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
}

.cert-item {
  text-align: center;
  padding: 25px 35px;
  background: var(--bg-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  min-width: 120px;
}

.cert-item .cert-icon {
  font-size: 2.5rem;
  margin-bottom: 10px;
}

.cert-item span {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
}

/* --- Footer --- */
.footer {
  background: var(--dark);
  color: rgba(255,255,255,0.8);
  padding: 80px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 60px;
}

.footer-brand p {
  margin: 20px 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(255,255,255,0.6);
}

.footer-social {
  display: flex;
  gap: 12px;
}

.footer-social a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.6);
  transition: var(--transition);
}

.footer-social a:hover {
  border-color: var(--primary);
  background: var(--primary);
  color: #fff;
}

.footer h4 {
  font-size: 1rem;
  color: #fff;
  margin-bottom: 20px;
}

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.6);
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--accent);
  padding-left: 3px;
}

.footer-contact li {
  display: flex;
  gap: 12px;
  margin-bottom: 15px;
  font-size: 0.9rem;
  color: rgba(255,255,255,0.6);
}

.footer-contact-icon {
  color: var(--accent);
  flex-shrink: 0;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 20px 0;
  text-align: center;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.4);
}

/* --- Contact Page Styles --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.contact-info h2 {
  font-size: 2rem;
  margin-bottom: 20px;
}

.contact-info > p {
  color: var(--text-light);
  margin-bottom: 35px;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 25px;
  margin-bottom: 35px;
}

.contact-item {
  display: flex;
  gap: 15px;
}

.contact-item-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, #e8f5e9, #c8e6c9);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.2rem;
}

.contact-item h4 {
  font-size: 1rem;
  margin-bottom: 4px;
  color: var(--dark);
}

.contact-item p {
  font-size: 0.9rem;
  color: var(--text-light);
}

.contact-form {
  background: var(--bg-white);
  padding: 40px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}

.contact-form h3 {
  font-size: 1.3rem;
  margin-bottom: 25px;
  color: var(--dark);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  transition: var(--transition);
  font-family: var(--font-primary);
  background: var(--bg-light);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(10,107,60,0.1);
  background: var(--bg-white);
}

.form-group textarea {
  min-height: 130px;
  resize: vertical;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

/* --- Page Banner --- */
.page-banner {
  padding: 140px 0 80px;
  background: var(--gradient-hero);
  color: #fff;
  text-align: center;
}

.page-banner h1 {
  font-size: 2.8rem;
  margin-bottom: 15px;
}

.page-banner p {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.8);
  max-width: 600px;
  margin: 0 auto;
}

/* --- About Page Styles --- */
.about-story {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-story-image {
  aspect-ratio: 4/3;
  background: linear-gradient(135deg, #e8f5e9, #c8e6c9);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: var(--primary);
}

.about-story-content h2 {
  font-size: 2.2rem;
  color: var(--dark);
  margin-bottom: 20px;
}

.about-story-content p {
  color: var(--text-light);
  line-height: 1.8;
  margin-bottom: 15px;
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.value-card {
  text-align: center;
  padding: 40px 25px;
  background: var(--bg-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.value-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.value-icon {
  font-size: 2.5rem;
  margin-bottom: 20px;
}

.value-card h3 {
  font-size: 1.15rem;
  margin-bottom: 12px;
  color: var(--dark);
}

.value-card p {
  font-size: 0.9rem;
  color: var(--text-light);
  line-height: 1.6;
}

.timeline {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  flex-wrap: wrap;
}

.timeline-item {
  flex: 1;
  min-width: 200px;
  text-align: center;
  padding: 35px 20px;
  background: var(--bg-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  position: relative;
}

.timeline-year {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 10px;
}

.timeline-item p {
  font-size: 0.9rem;
  color: var(--text-light);
}

/* --- Product Detail Page --- */
.product-detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.product-gallery {
  background: linear-gradient(135deg, #e8f5e9, #f1f8f9);
  border-radius: var(--radius);
  padding: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 6rem;
  color: var(--primary);
  min-height: 400px;
}

.product-info h2 {
  font-size: 2rem;
  color: var(--dark);
  margin-bottom: 10px;
}

.product-info .product-category {
  color: var(--primary);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 1px;
}

.product-info .product-description {
  color: var(--text-light);
  line-height: 1.7;
  margin: 20px 0;
}

.specs-table {
  width: 100%;
  border-collapse: collapse;
  margin: 25px 0;
}

.specs-table tr {
  border-bottom: 1px solid var(--border);
}

.specs-table td {
  padding: 12px 15px;
  font-size: 0.9rem;
}

.specs-table td:first-child {
  font-weight: 600;
  color: var(--text);
  width: 40%;
}

.specs-table td:last-child {
  color: var(--text-light);
}

/* --- Blog Cards --- */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.blog-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.blog-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.blog-card-image {
  height: 200px;
  background: linear-gradient(135deg, #1a3a5c, #2a5a8c);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  color: rgba(255,255,255,0.2);
}

.blog-card-body {
  padding: 25px;
}

.blog-date {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-bottom: 8px;
}

.blog-card-body h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
  color: var(--dark);
}

.blog-card-body p {
  font-size: 0.9rem;
  color: var(--text-light);
  line-height: 1.6;
  margin-bottom: 15px;
}

.blog-card-body .btn {
  padding: 8px 0;
  font-size: 0.9rem;
  color: var(--primary);
  background: none;
  border: none;
}

.blog-card-body .btn:hover {
  color: var(--primary-light);
  gap: 12px;
}

/* --- Page Header (for sub pages) --- */
.page-header {
  padding: 120px 0 60px;
  background: var(--bg-light);
  border-bottom: 1px solid var(--border);
}

.page-header h1 {
  font-size: 2.2rem;
  color: var(--dark);
  text-align: center;
}

/* ============================================
   Responsive Design
   ============================================ */

/* Tablet */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-content {
    text-align: center;
  }

  .hero-content p {
    margin: 0 auto 35px;
  }

  .hero-buttons {
    justify-content: center;
  }

  .hero-stats {
    max-width: 500px;
    margin: 40px auto 0;
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .products-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-image {
    order: -1;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-story {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .values-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .product-detail-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .blog-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .section-title {
    font-size: 2rem;
  }
}

/* Mobile */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .nav-links {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--bg-white);
    flex-direction: column;
    padding: 30px 20px;
    gap: 20px;
    box-shadow: var(--shadow-md);
    border-bottom: 1px solid var(--border);
  }

  .nav-links.open {
    display: flex;
  }

  .hero {
    padding: 120px 0 60px;
  }

  .hero-content h1 {
    font-size: 2.2rem;
  }

  .hero-stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
  }

  .hero-stat-number {
    font-size: 1.5rem;
  }

  .section {
    padding: 60px 0;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .products-grid {
    grid-template-columns: 1fr;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .values-grid {
    grid-template-columns: 1fr;
  }

  .blog-grid {
    grid-template-columns: 1fr;
  }

  .about-features {
    grid-template-columns: 1fr;
  }

  .about-story-content h2 {
    font-size: 1.8rem;
  }

  .page-banner h1 {
    font-size: 2rem;
  }

  .section-title {
    font-size: 1.8rem;
  }

  .cta-section h2 {
    font-size: 1.8rem;
  }

  .contact-form {
    padding: 25px;
  }

  .timeline {
    flex-direction: column;
  }

  .hero-image {
    display: none;
  }

  .certs-grid {
    gap: 20px;
  }
}

/* Small Mobile */
@media (max-width: 480px) {
  .hero-content h1 {
    font-size: 1.8rem;
  }

  .hero-stat-number {
    font-size: 1.3rem;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }

  .page-banner h1 {
    font-size: 1.6rem;
  }

  .section-title {
    font-size: 1.5rem;
  }
}

/* ============================================
   Animations
   ============================================ */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Utility */
.text-center {
  text-align: center;
}
.mt-20 { margin-top: 20px; }
.mt-40 { margin-top: 40px; }
.mb-40 { margin-bottom: 40px; }