/* ============================================
   Jiajian Hot Melt Adhesive - B2B Website
   Professional Industrial Style
   Color Scheme: Blue-Gray
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
  --primary: #1a3a5c;
  --primary-light: #2c5f8a;
  --primary-dark: #0f2440;
  --secondary: #4a6fa5;
  --accent: #e8943a;
  --accent-hover: #d4832e;
  --text-dark: #2d3748;
  --text-medium: #4a5568;
  --text-light: #718096;
  --bg-white: #ffffff;
  --bg-light: #f7f9fb;
  --bg-gray: #edf2f7;
  --border: #d2dae4;
  --border-light: #e8eef4;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.12);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --transition: all 0.3s ease;
  --max-width: 1200px;
  --header-height: 80px;
}

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

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

body {
  font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  color: var(--text-dark);
  background: var(--bg-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  color: var(--accent);
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

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

h1 { font-size: 2.75rem; }
h2 { font-size: 2rem; margin-bottom: 1rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
  margin-bottom: 1rem;
  color: var(--text-medium);
}

.section-title {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title h2 {
  position: relative;
  display: inline-block;
  padding-bottom: 12px;
}

.section-title h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
}

.section-title p {
  margin-top: 1rem;
  font-size: 1.1rem;
  color: var(--text-light);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  line-height: 1.5;
}

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

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

.btn-secondary {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,0.8);
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.15);
  color: #fff;
  border-color: #fff;
}

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

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

.btn-sm {
  padding: 8px 20px;
  font-size: 0.9rem;
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.1rem;
}

/* ---------- Header / Navigation ---------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid var(--border-light);
  transition: var(--transition);
}

.header.scrolled {
  box-shadow: var(--shadow-sm);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.logo-icon {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 1.2rem;
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-text .brand-name {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.2;
  letter-spacing: -0.5px;
}

.logo-text .brand-slogan {
  font-size: 0.7rem;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 1.5px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav a {
  padding: 8px 16px;
  color: var(--text-medium);
  font-weight: 500;
  font-size: 0.95rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.nav a:hover,
.nav a.active {
  color: var(--primary);
  background: var(--bg-light);
}

.nav .btn-primary {
  color: #fff;
  margin-left: 8px;
}

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

/* Mobile Menu Toggle */
.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
}

.mobile-toggle span {
  width: 24px;
  height: 2.5px;
  background: var(--text-dark);
  border-radius: 2px;
  transition: var(--transition);
}

/* ---------- Hero Section ---------- */
.hero {
  position: relative;
  min-height: 600px;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--secondary) 100%);
  overflow: hidden;
  margin-top: var(--header-height);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.5;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 650px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 50px;
  color: rgba(255,255,255,0.9);
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 24px;
  backdrop-filter: blur(4px);
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  background: #48bb78;
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.hero h1 {
  color: #fff;
  font-size: 3rem;
  margin-bottom: 20px;
  line-height: 1.2;
}

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

.hero p {
  color: rgba(255,255,255,0.85);
  font-size: 1.15rem;
  line-height: 1.8;
  margin-bottom: 32px;
}

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

.hero-stats {
  display: flex;
  gap: 48px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.15);
}

.hero-stat {
  text-align: left;
}

.hero-stat .number {
  font-size: 2rem;
  font-weight: 800;
  color: #fff;
}

.hero-stat .label {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.7);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Hero Visual */
.hero-visual {
  position: absolute;
  right: -50px;
  top: 50%;
  transform: translateY(-50%);
  width: 500px;
  height: 500px;
  opacity: 0.15;
}

.hero-visual .circle {
  position: absolute;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.3);
}

.hero-visual .circle:nth-child(1) {
  width: 400px; height: 400px;
  top: 50px; left: 50px;
  animation: spin 20s linear infinite;
}

.hero-visual .circle:nth-child(2) {
  width: 300px; height: 300px;
  top: 100px; left: 100px;
  animation: spin 15s linear infinite reverse;
}

.hero-visual .circle:nth-child(3) {
  width: 200px; height: 200px;
  top: 150px; left: 150px;
  animation: spin 10s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ---------- Features / USP Section ---------- */
.features {
  padding: 80px 0;
  background: var(--bg-white);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  text-align: center;
  padding: 40px 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  transition: var(--transition);
}

.feature-card:hover {
  border-color: var(--secondary);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, var(--bg-light), var(--bg-gray));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
}

.feature-card h4 {
  margin-bottom: 8px;
  font-size: 1.1rem;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-light);
  margin-bottom: 0;
}

/* ---------- Products Section ---------- */
.products-section {
  padding: 80px 0;
  background: var(--bg-light);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

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

.product-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-6px);
}

.product-card-image {
  position: relative;
  height: 240px;
  background: linear-gradient(135deg, #e2e8f0, #edf2f7);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.product-card-image .product-icon {
  font-size: 4rem;
  opacity: 0.6;
}

.product-card-image .product-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  padding: 4px 12px;
  background: var(--accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 50px;
  text-transform: uppercase;
}

.product-card-body {
  padding: 24px;
}

.product-card-body h3 {
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.product-card-body p {
  font-size: 0.9rem;
  color: var(--text-light);
  margin-bottom: 16px;
}

.product-card-body .specs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.product-card-body .specs span {
  padding: 4px 10px;
  background: var(--bg-gray);
  color: var(--text-medium);
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
}

.product-card-body .card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--secondary);
  font-weight: 600;
  font-size: 0.9rem;
}

.product-card-body .card-link:hover {
  color: var(--accent);
  gap: 10px;
}

/* ---------- About Section ---------- */
.about-section {
  padding: 80px 0;
  background: var(--bg-white);
}

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

.about-image {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-image-text {
  color: rgba(255,255,255,0.15);
  font-size: 8rem;
  font-weight: 900;
  letter-spacing: -4px;
}

.about-content h2 {
  margin-bottom: 20px;
}

.about-content p {
  margin-bottom: 16px;
  font-size: 1.05rem;
}

.about-highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 24px;
}

.about-highlight-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--bg-light);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent);
}

.about-highlight-item .check-icon {
  color: #48bb78;
  font-weight: bold;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.about-highlight-item span {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-dark);
}

/* ---------- CTA / Inquiry Section ---------- */
.cta-section {
  padding: 80px 0;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  background: rgba(255,255,255,0.03);
  border-radius: 50%;
}

.cta-content {
  text-align: center;
  position: relative;
  z-index: 2;
}

.cta-content h2 {
  color: #fff;
  font-size: 2.2rem;
  margin-bottom: 16px;
}

.cta-content p {
  color: rgba(255,255,255,0.8);
  font-size: 1.1rem;
  margin-bottom: 32px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

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

/* ---------- Inquiry Form Section ---------- */
.inquiry-section {
  padding: 80px 0;
  background: var(--bg-light);
}

.inquiry-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.inquiry-info h2 {
  margin-bottom: 16px;
}

.inquiry-info p {
  font-size: 1.05rem;
  margin-bottom: 24px;
}

.contact-list {
  list-style: none;
}

.contact-list li {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-light);
}

.contact-list li:last-child {
  border-bottom: none;
}

.contact-list .icon {
  width: 44px;
  height: 44px;
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.contact-list .info-label {
  font-size: 0.85rem;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

.contact-list .info-value {
  font-weight: 600;
  color: var(--text-dark);
}

.inquiry-form {
  background: var(--bg-white);
  padding: 40px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}

.inquiry-form h3 {
  margin-bottom: 24px;
  font-size: 1.3rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

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

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

.form-group label .required {
  color: #e53e3e;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--text-dark);
  transition: var(--transition);
  background: var(--bg-white);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--secondary);
  box-shadow: 0 0 0 3px rgba(74, 111, 165, 0.1);
}

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

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-light);
}

.form-submit {
  width: 100%;
  padding: 14px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
}

.form-submit:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.form-note {
  margin-top: 12px;
  font-size: 0.8rem;
  color: var(--text-light);
  text-align: center;
}

/* ---------- Footer ---------- */
.footer {
  background: var(--primary-dark);
  color: rgba(255,255,255,0.7);
  padding: 60px 0 0;
}

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

.footer-brand .footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.footer-brand .footer-logo .logo-icon {
  width: 40px;
  height: 40px;
  background: rgba(255,255,255,0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 1.1rem;
}

.footer-brand .footer-logo .brand-name {
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
}

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

.footer h4 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 10px;
}

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

.footer-links a:hover {
  color: #fff;
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
}

.footer-bottom a {
  color: rgba(255,255,255,0.5);
}

.footer-bottom a:hover {
  color: #fff;
}

/* ---------- Product Detail Page ---------- */
.page-header {
  padding: 40px 0;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  margin-top: var(--header-height);
}

.page-header h1 {
  color: #fff;
  font-size: 2rem;
}

.page-header .breadcrumb {
  display: flex;
  gap: 8px;
  margin-top: 8px;
  font-size: 0.9rem;
}

.page-header .breadcrumb a {
  color: rgba(255,255,255,0.6);
}

.page-header .breadcrumb span {
  color: rgba(255,255,255,0.4);
}

.product-detail {
  padding: 60px 0;
}

.product-detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.product-gallery {
  background: var(--bg-light);
  border-radius: var(--radius-lg);
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-light);
}

.product-gallery .product-icon {
  font-size: 8rem;
  opacity: 0.4;
}

.product-info h1 {
  font-size: 1.8rem;
  margin-bottom: 12px;
}

.product-info .product-subtitle {
  font-size: 1.1rem;
  color: var(--text-light);
  margin-bottom: 24px;
}

.product-info .product-desc {
  margin-bottom: 24px;
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 24px;
}

.spec-table th,
.spec-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.9rem;
}

.spec-table th {
  background: var(--bg-light);
  font-weight: 600;
  color: var(--text-dark);
  width: 40%;
}

.spec-table td {
  color: var(--text-medium);
}

/* ---------- Product Category Tabs ---------- */
.product-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 40px;
  flex-wrap: wrap;
  justify-content: center;
}

.product-tab {
  padding: 10px 24px;
  border: 1px solid var(--border);
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-medium);
  cursor: pointer;
  transition: var(--transition);
  background: var(--bg-white);
}

.product-tab:hover,
.product-tab.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* ---------- Industries Section ---------- */
.industries-section {
  padding: 80px 0;
  background: var(--bg-white);
}

.industries-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.industry-card {
  position: relative;
  padding: 32px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: #fff;
  overflow: hidden;
  transition: var(--transition);
}

.industry-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.industry-card::before {
  content: '';
  position: absolute;
  top: -20px;
  right: -20px;
  width: 100px;
  height: 100px;
  background: rgba(255,255,255,0.05);
  border-radius: 50%;
}

.industry-card .industry-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.industry-card h4 {
  color: #fff;
  margin-bottom: 8px;
}

.industry-card p {
  color: rgba(255,255,255,0.7);
  font-size: 0.9rem;
  margin-bottom: 0;
}

/* ---------- Testimonials ---------- */
.testimonials-section {
  padding: 80px 0;
  background: var(--bg-gray);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial-card {
  background: var(--bg-white);
  padding: 32px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
}

.testimonial-card .stars {
  color: var(--accent);
  font-size: 1rem;
  margin-bottom: 16px;
}

.testimonial-card .quote {
  font-style: italic;
  color: var(--text-medium);
  margin-bottom: 20px;
  line-height: 1.7;
}

.testimonial-card .author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.testimonial-card .author-avatar {
  width: 44px;
  height: 44px;
  background: var(--bg-gray);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--secondary);
}

.testimonial-card .author-info .name {
  font-weight: 600;
  color: var(--text-dark);
  font-size: 0.9rem;
}

.testimonial-card .author-info .role {
  font-size: 0.8rem;
  color: var(--text-light);
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .products-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }
  .industries-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }
  
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  
  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-white);
    flex-direction: column;
    padding: 20px;
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-md);
    display: none;
  }
  
  .nav.open {
    display: flex;
  }
  
  .nav a {
    width: 100%;
    padding: 12px 16px;
  }
  
  .mobile-toggle {
    display: flex;
  }
  
  .hero {
    min-height: 500px;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .hero-stats {
    gap: 24px;
    flex-wrap: wrap;
  }
  
  .hero-visual {
    display: none;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .products-grid {
    grid-template-columns: 1fr;
  }
  
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .inquiry-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .product-detail-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
  
  .industries-grid {
    grid-template-columns: 1fr;
  }
  
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  
  .inquiry-form {
    padding: 24px;
  }
  
  .about-highlights {
    grid-template-columns: 1fr;
  }
}

/* ---------- Animations ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ---------- Utility ---------- */
.text-center { text-align: center; }
.text-left { text-align: left; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }

/* ---------- Toast Notification ---------- */
.toast {
  position: fixed;
  bottom: 30px;
  right: 30px;
  padding: 16px 24px;
  background: #48bb78;
  color: #fff;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 10000;
  font-weight: 500;
  transform: translateX(120%);
  transition: transform 0.4s ease;
}

.toast.show {
  transform: translateX(0);
}

.toast.error {
  background: #e53e3e;
}

/* ---------- Certifications Section ---------- */
.certifications {
  padding: 40px 0;
  background: var(--bg-white);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

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

.cert-item {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-light);
  font-size: 0.9rem;
  font-weight: 500;
}

.cert-item .cert-icon {
  width: 48px;
  height: 48px;
  background: var(--bg-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
}

/* ---------- Back to Top ---------- */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 44px;
  height: 44px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 1.2rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--accent);
  transform: translateY(-3px);
}