/* ========================================
   YQ STEEL - Mobile-First Responsive Design
   ======================================== */

/* CSS Variables - Bright Industrial Palette */
:root {
  /* Background Colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-elevated: #ffffff;
  
  /* Primary - Steel Blue */
  --primary-50: #eff6ff;
  --primary-100: #dbeafe;
  --primary-200: #bfdbfe;
  --primary-300: #93c5fd;
  --primary-400: #60a5fa;
  --primary-500: #3b82f6;
  --primary-600: #2563eb;
  --primary-700: #1d4ed8;
  --primary-800: #1e40af;
  --primary-900: #1e3a8a;
  
  /* Accent - Warm Orange */
  --accent-50: #fff7ed;
  --accent-100: #ffedd5;
  --accent-200: #fed7aa;
  --accent-300: #fdba74;
  --accent-400: #fb923c;
  --accent-500: #f97316;
  --accent-600: #ea580c;
  --accent-700: #c2410c;
  
  /* Neutral - Slate */
  --slate-50: #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-500: #64748b;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-800: #1e293b;
  --slate-900: #0f172a;
  
  /* Text Colors */
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-inverse: #ffffff;
  
  /* Border & Shadow */
  --border-light: #e2e8f0;
  --border-medium: #cbd5e1;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-accent: 0 10px 40px -10px rgba(249, 115, 22, 0.4);
  
  /* Typography */
  --font-display: 'Plus Jakarta Sans', 'Inter', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  
  /* Spacing Scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-3xl: 2rem;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========================================
   RESET & BASE - Mobile First
   ======================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-secondary);
  background: var(--bg-primary);
  min-height: 100vh;
  overflow-x: hidden;
  width: 100%;
}

/* Prevent horizontal scroll */
html, body {
  max-width: 100vw;
  overflow-x: hidden;
}

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

/* ========================================
   TYPOGRAPHY - Mobile First
   ======================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

/* Mobile font sizes (base) */
h1 { font-size: 1.875rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.125rem; }

p {
  color: var(--text-secondary);
  line-height: 1.7;
}

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

/* ========================================
   CONTAINER - Mobile First
   ======================================== */
.container {
  width: 100%;
  margin: 0 auto;
  padding: 0 var(--space-4);
  max-width: 100%;
}

/* ========================================
   NAVIGATION - Mobile First
   ======================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 99;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-light);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo img {
  height: 36px;
  width: auto;
  border-radius: 6px;
}

.logo span {
  color: var(--accent-500);
}

/* Mobile Menu Toggle */
.mobile-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  z-index: 101;
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
}

.mobile-toggle:hover {
  background: var(--bg-secondary);
}

.mobile-toggle.active {
  background: var(--bg-tertiary);
}

/* Navigation Menu - Mobile (hidden by default) */
.nav-menu {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  height: calc(100vh - 64px);
  min-height: calc(100vh - 64px);
  max-height: calc(100vh - 64px);
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  flex-direction: column;
  align-items: stretch;
  padding: var(--space-4);
  gap: var(--space-2);
  list-style: none;
  z-index: 100;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.nav-menu.active {
  display: flex;
}

.nav-menu li {
  width: 100%;
}

.nav-menu a {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: var(--space-3) var(--space-4);
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-lg);
  transition: var(--transition-fast);
}

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

.nav-menu a.btn-primary {
  justify-content: center;
  margin-top: var(--space-2);
}

/* Language Dropdown */
.language-dropdown {
  position: relative;
  width: 100%;
}

.language-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  min-height: 48px;
  padding: var(--space-3) var(--space-4);
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  color: var(--text-secondary);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-fast);
}

.language-toggle:hover {
  background: var(--bg-tertiary);
  border-color: var(--border-medium);
}

.language-toggle svg {
  width: 16px;
  height: 16px;
  transition: transform 0.2s ease;
}

.language-dropdown.active .language-toggle svg {
  transform: rotate(180deg);
}

.language-menu {
  position: static;
  width: 100%;
  background: white;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  margin-top: var(--space-2);
  overflow: hidden;
  display: none;
}

.language-dropdown.active .language-menu {
  display: block;
}

.language-option {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 48px;
  padding: var(--space-3) var(--space-4);
  color: var(--text-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-fast);
  border-bottom: 1px solid var(--border-light);
  text-decoration: none;
}

.language-option:last-child {
  border-bottom: none;
}

.language-option:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.language-option.active {
  background: var(--primary-50);
  color: var(--primary-600);
}

.language-flag {
  font-size: 1.125rem;
}

/* ========================================
   BUTTONS - Touch Friendly
   ======================================== */
.btn-primary, .btn-secondary, .btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 48px;
  padding: var(--space-3) var(--space-6);
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: var(--transition-base);
  border: none;
  text-align: center;
  touch-action: manipulation;
}

.btn-primary {
  background: var(--gradient-accent);
  background: linear-gradient(135deg, #f97316 0%, #fb923c 100%);
  color: white;
  box-shadow: var(--shadow-accent);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 40px -10px rgba(249, 115, 22, 0.5);
}

.btn-secondary {
  background: var(--primary-600);
  color: white;
}

.btn-secondary:hover {
  background: var(--primary-700);
  transform: translateY(-2px);
}

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

.btn-outline:hover {
  border-color: var(--accent-500);
  color: var(--accent-600);
}

.btn-large {
  min-height: 52px;
  padding: var(--space-4) var(--space-8);
  font-size: 1rem;
}

/* ========================================
   HERO SECTION - Mobile First
   ======================================== */
.hero {
  position: relative;
  min-height: auto;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #ffffff 0%, #f8fafc 50%, #f1f5f9 100%);
  padding-top: 100px;
  padding-bottom: var(--space-12);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 80% 20%, rgba(59, 130, 246, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 20% 80%, rgba(249, 115, 22, 0.06) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 100%;
  text-align: center;
}

.hero h1 {
  margin-bottom: var(--space-4);
  line-height: 1.15;
  font-size: 1.75rem;
}

.hero h1 span {
  color: var(--accent-500);
}

.hero-subtitle {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: var(--space-6);
  max-width: 100%;
}

.hero-cta {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  align-items: center;
}

.hero-cta .btn-primary,
.hero-cta .btn-outline,
.hero-cta a {
  width: 100%;
  max-width: 280px;
}

/* Hero with video background */
.hero video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

.hero > div[style*="z-index: 2"] {
  position: relative;
  z-index: 2;
}

/* ========================================
   COUNTER SECTION - Mobile First
   ======================================== */
.counter-section {
  padding: var(--space-12) 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.counter-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.counter-item {
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: var(--space-6) var(--space-4);
  text-align: center;
  transition: var(--transition-base);
  box-shadow: var(--shadow-sm);
}

.counter-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-200);
}

.counter-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent-500);
  line-height: 1.2;
  display: block;
  margin-bottom: var(--space-2);
}

.counter-label {
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ========================================
   PRODUCTS SECTION - Mobile First
   ======================================== */
.products-section {
  padding: var(--space-12) 0;
  background: var(--bg-primary);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-8);
}

.section-header h2 {
  margin-bottom: var(--space-3);
}

.section-header p {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 100%;
  margin: 0 auto;
}

.category-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 3px solid var(--accent-500);
  display: inline-block;
}

.product-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-10);
}

.product-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: var(--transition-base);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  display: block;
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-200);
}

.product-image {
  height: 180px;
  background: linear-gradient(135deg, var(--primary-50) 0%, var(--bg-tertiary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.product-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.placeholder-img {
  font-size: 0.875rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
}

.product-info {
  padding: var(--space-4);
}

.product-info h4 {
  font-size: 1.125rem;
  margin-bottom: var(--space-2);
  color: var(--text-primary);
}

.product-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: var(--space-2);
  line-height: 1.5;
}

.product-spec {
  display: block;
  font-size: 0.75rem;
  color: var(--primary-600);
  font-family: monospace;
  font-weight: 600;
  margin-bottom: var(--space-3);
  padding: var(--space-2) var(--space-3);
  background: var(--primary-50);
  border-radius: var(--radius-md);
  word-break: break-word;
}

.product-link {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent-600);
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.product-link::after {
  content: '→';
  transition: var(--transition-fast);
}

.product-card:hover .product-link::after {
  transform: translateX(4px);
}

/* ========================================
   WHY CHOOSE US - Mobile First
   ======================================== */
.why-us {
  padding: var(--space-12) 0;
  background: var(--bg-secondary);
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.feature-item {
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  transition: var(--transition-base);
  box-shadow: var(--shadow-sm);
}

.feature-item:hover {
  border-color: var(--primary-200);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.feature-item h4 {
  font-size: 1.0625rem;
  margin-bottom: var(--space-2);
  color: var(--text-primary);
}

.feature-item p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ========================================
   WORKFLOW - Mobile First
   ======================================== */
.workflow {
  padding: var(--space-12) 0;
  background: var(--bg-primary);
  position: relative;
}

.workflow-steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  position: relative;
}

.workflow-steps::before {
  display: none;
}

.step {
  flex: 1;
  text-align: center;
  position: relative;
  z-index: 1;
}

.step-number {
  width: 48px;
  height: 48px;
  background: var(--bg-primary);
  border: 3px solid var(--accent-500);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--accent-600);
  margin: 0 auto var(--space-3);
  box-shadow: 0 0 0 4px var(--bg-primary), 0 0 20px rgba(249, 115, 22, 0.3);
}

.step h4 {
  font-size: 1rem;
  margin-bottom: var(--space-1);
  color: var(--text-primary);
}

.step p {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* ========================================
   TANGSHAN SECTION - Mobile First
   ======================================== */
.tangshan-ports,
.tangshan-section {
  padding: var(--space-12) 0;
  background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
}

.tangshan-ports .section-header,
.tangshan-section .section-header {
  margin-bottom: var(--space-8);
}

.tangshan-ports h2,
.tangshan-section h2 {
  font-size: 1.5rem;
  margin-bottom: var(--space-3);
}

.tangshan-ports h2 span,
.tangshan-section h2 span {
  color: var(--accent-500);
}

/* Stats cards in Tangshan section */
[style*="display: grid"] {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

/* ========================================
   CTA SECTION - Mobile First
   ======================================== */
.cta-section {
  padding: var(--space-12) var(--space-4);
  background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-700) 100%);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-section::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='0.05'%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");
}

.cta-section h2 {
  color: white;
  margin-bottom: var(--space-3);
  position: relative;
  font-size: 1.5rem;
}

.cta-section p {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.9);
  max-width: 100%;
  margin: 0 auto var(--space-6);
  position: relative;
}

.cta-section .btn-primary {
  background: white;
  color: var(--primary-700);
  position: relative;
  width: 100%;
  max-width: 280px;
}

.cta-section .btn-primary:hover {
  background: var(--bg-secondary);
  transform: translateY(-2px);
  box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.3);
}

/* ========================================
   FOOTER - Mobile First
   ======================================== */
.footer {
  background: var(--bg-secondary);
  padding: var(--space-10) 0 var(--space-6);
  border-top: 1px solid var(--border-light);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

.footer-col h4 {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-3);
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: var(--space-2);
}

.footer-col a {
  display: flex;
  align-items: center;
  min-height: 36px;
  font-size: 0.9375rem;
  color: var(--text-muted);
  transition: var(--transition-fast);
}

.footer-col a:hover {
  color: var(--accent-600);
}

.footer-col p {
  font-size: 0.9375rem;
  color: var(--text-muted);
  margin-bottom: var(--space-1);
}

.footer-bottom {
  padding-top: var(--space-6);
  border-top: 1px solid var(--border-light);
  text-align: center;
}

.footer-bottom p {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* ========================================
   PRODUCT PAGES - Mobile First
   ======================================== */

/* Product Overview Grid */
[style*="display: grid"][style*="grid-template-columns: 1fr 1fr"] {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

[style*="display: grid"][style*="grid-template-columns: 1fr 1fr"] > div {
  width: 100%;
}

[style*="height: 400px"] {
  height: 250px !important;
}

/* Product specs grid */
[style*="grid-template-columns: 1fr 1fr"] {
  grid-template-columns: 1fr !important;
}

/* Size grid */
[style*="grid-template-columns: repeat(4"] {
  grid-template-columns: repeat(2, 1fr) !important;
}

/* Applications grid */
[style*="grid-template-columns: repeat(3"] {
  grid-template-columns: 1fr !important;
}

/* ========================================
   ABOUT PAGE - Mobile First
   ======================================== */
.about-hero {
  background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 50%, #f1f5f9 100%);
  padding: 100px 0 var(--space-8);
  position: relative;
  overflow: hidden;
}

.about-hero h1 {
  font-size: 1.875rem;
  margin-bottom: var(--space-4);
}

.about-hero .subtitle {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.mv-section {
  padding: var(--space-10) 0;
  background: #ffffff;
}

.mv-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.mv-card {
  background: linear-gradient(145deg, #ffffff 0%, #f8fafc 100%);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  text-align: center;
}

.mv-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-4);
  font-size: 1.5rem;
  color: white;
}

.mv-card h3 {
  font-size: 1.125rem;
  margin-bottom: var(--space-2);
}

.mv-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.profile-section {
  padding: var(--space-10) 0;
}

.profile-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.profile-content h2 {
  font-size: 1.5rem;
  margin-bottom: var(--space-4);
}

.profile-content p {
  font-size: 0.9375rem;
  margin-bottom: var(--space-3);
}

.profile-highlight {
  background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
  border-left: 4px solid var(--accent-500);
  padding: var(--space-4);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  margin: var(--space-4) 0;
}

.profile-image-main {
  height: 280px !important;
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.profile-stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.stat-item {
  background: white;
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  text-align: center;
  min-width: 100px;
}

.stat-number {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent-500);
  display: block;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Products Table */
.products-table {
  background: white;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
}

.products-table-header,
.products-table-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
  padding: var(--space-4);
}

.products-table-header {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: white;
  font-weight: 600;
  display: none; /* Hide header on mobile */
}

.products-table-row {
  border-bottom: 1px solid var(--border-light);
  padding: var(--space-4);
}

.products-table-row:last-child {
  border-bottom: none;
}

.category-cell {
  font-weight: 700;
  color: var(--primary-600);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.product-cell {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 1rem;
}

.spec-cell {
  color: var(--text-muted);
  font-family: monospace;
  font-size: 0.8125rem;
  word-break: break-word;
}

/* Service Grid */
.service-section {
  padding: var(--space-10) 0;
}

.service-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.service-step {
  background: white;
  border: 2px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  text-align: center;
}

.service-step h4 {
  font-size: 1rem;
  margin-bottom: var(--space-2);
}

.service-step p {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* Why Section */
.why-section {
  padding: var(--space-10) 0;
}

.why-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.why-card {
  background: white;
  padding: var(--space-5);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-light);
  text-align: center;
}

.why-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-4);
  font-size: 1.5rem;
}

.why-card h4 {
  font-size: 1.0625rem;
  margin-bottom: var(--space-2);
}

.why-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* CTA Buttons */
.cta-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  align-items: center;
}

.cta-buttons a {
  width: 100%;
  max-width: 280px;
}

.btn-white,
.btn-outline-white {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-xl);
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition-base);
}

.btn-white {
  background: white;
  color: var(--primary-700);
}

.btn-outline-white {
  background: transparent;
  color: white;
  border: 2px solid white;
}

/* ========================================
   TABLET BREAKPOINT (640px)
   ======================================== */
@media (min-width: 640px) {
  .container {
    padding: 0 var(--space-6);
  }
  
  /* Typography */
  h1 { font-size: 2.25rem; }
  h2 { font-size: 1.875rem; }
  h3 { font-size: 1.5rem; }
  
  /* Hero */
  .hero h1 {
    font-size: 2.25rem;
  }
  
  .hero-subtitle {
    font-size: 1.125rem;
  }
  
  .hero-cta {
    flex-direction: row;
    justify-content: center;
    flex-wrap: wrap;
  }
  
  .hero-cta .btn-primary,
  .hero-cta .btn-outline,
  .hero-cta a {
    width: auto;
  }
  
  /* Counter */
  .counter-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .counter-number {
    font-size: 2.25rem;
  }
  
  /* Products */
  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  /* Features */
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  /* Workflow */
  .workflow-steps {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .step {
    flex: 0 0 calc(50% - var(--space-3));
  }
  
  /* Footer */
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  /* Product pages */
  [style*="grid-template-columns: repeat(4"] {
    grid-template-columns: repeat(3, 1fr) !important;
  }
  
  [style*="grid-template-columns: repeat(3"] {
    grid-template-columns: repeat(2, 1fr) !important;
  }
  
  /* About page */
  .about-hero h1 {
    font-size: 2.5rem;
  }
  
  .cta-buttons {
    flex-direction: row;
    justify-content: center;
  }
  
  .cta-buttons a {
    width: auto;
  }
}

/* ========================================
   DESKTOP BREAKPOINT (768px)
   ======================================== */
@media (min-width: 768px) {
  /* Navigation */
  .navbar .container {
    height: 72px;
  }
  
  .mobile-toggle {
    display: none;
  }
  
  .nav-menu {
    display: flex;
    position: static;
    flex-direction: row;
    align-items: center;
    padding: 0;
    background: transparent;
    overflow: visible;
    width: auto;
  }
  
  .nav-menu li {
    width: auto;
  }
  
  .nav-menu a {
    min-height: auto;
    padding: var(--space-2) var(--space-4);
    font-size: 0.9375rem;
  }
  
  .nav-menu a.btn-primary {
    margin-top: 0;
  }
  
  /* Language Dropdown - Desktop */
  .language-dropdown {
    width: auto;
    margin-right: var(--space-4);
    padding-right: var(--space-4);
    border-right: 1px solid var(--border-light);
  }
  
  .language-toggle {
    width: auto;
    min-height: auto;
    justify-content: flex-start;
  }
  
  .language-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 16px;
    left: auto;
    width: 180px;
    min-width: 180px;
    display: block;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    margin-top: 0;
    z-index: 1000;
    background: white;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    box-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.3);
    overflow: visible;
  }
  
  .language-dropdown.active .language-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    display: block;
  }
  
  .language-option {
    white-space: nowrap;
    padding: 14px 18px;
  }
  
  /* Hero */
  .hero {
    min-height: 100vh;
    padding-top: 120px;
    padding-bottom: var(--space-16);
  }
  
  .hero-content {
    text-align: left;
    max-width: 600px;
  }
  
  .hero h1 {
    font-size: 2.75rem;
  }
  
  .hero-cta {
    justify-content: flex-start;
  }
  
  /* Counter */
  .counter-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .counter-number {
    font-size: 2.5rem;
  }
  
  /* Products */
  .product-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  }
  
  /* Features */
  .features-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  /* Workflow */
  .workflow-steps {
    flex-wrap: nowrap;
    justify-content: space-between;
  }
  
  .workflow-steps::before {
    display: block;
    content: '';
    position: absolute;
    top: 28px;
    left: 10%;
    right: 10%;
    height: 2px;
    background: linear-gradient(90deg, var(--border-light), var(--accent-400), var(--border-light));
    z-index: 0;
  }
  
  .step {
    flex: 1;
  }
  
  /* Footer */
  .footer-grid {
    grid-template-columns: 2fr 1fr 1.5fr;
  }
  
  /* Product pages */
  [style*="display: grid"][style*="grid-template-columns: 1fr 1fr"] {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }
  
  [style*="height: 400px"] {
    height: 350px !important;
  }
  
  [style*="grid-template-columns: 1fr 1fr"] {
    grid-template-columns: repeat(2, 1fr) !important;
  }
  
  [style*="grid-template-columns: repeat(4"] {
    grid-template-columns: repeat(4, 1fr) !important;
  }
  
  [style*="grid-template-columns: repeat(3"] {
    grid-template-columns: repeat(3, 1fr) !important;
  }
  
  /* About page */
  .mv-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .profile-grid {
    flex-direction: row;
    align-items: center;
  }
  
  .profile-image-main {
    height: 400px !important;
  }
  
  .service-grid {
    grid-template-columns: repeat(5, 1fr);
  }
  
  .service-step::after {
    content: '→';
    position: absolute;
    right: -16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--border-medium);
    font-size: 1.25rem;
    font-weight: 700;
  }
  
  .service-step:last-child::after {
    display: none;
  }
  
  .why-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  /* Products Table */
  .products-table-header {
    display: grid;
    grid-template-columns: 1fr 2fr 2fr;
  }
  
  .products-table-row {
    grid-template-columns: 1fr 2fr 2fr;
  }
}

/* ========================================
   LARGE DESKTOP BREAKPOINT (1024px)
   ======================================== */
@media (min-width: 1024px) {
  .container {
    max-width: 1024px;
  }
  
  /* Typography */
  h1 { font-size: 3rem; }
  h2 { font-size: 2.25rem; }
  
  /* Hero */
  .hero h1 {
    font-size: 3.25rem;
  }
  
  .hero-subtitle {
    font-size: 1.25rem;
  }
  
  /* Counter */
  .counter-number {
    font-size: 3rem;
  }
  
  /* Product pages */
  [style*="height: 400px"] {
    height: 400px !important;
  }
}

/* ========================================
   EXTRA LARGE DESKTOP BREAKPOINT (1280px)
   ======================================== */
@media (min-width: 1280px) {
  .container {
    max-width: 1280px;
    padding: 0 var(--space-6);
  }
  
  /* Hero */
  .hero h1 {
    font-size: 3.5rem;
  }
  
  .hero-content {
    max-width: 700px;
  }
}

/* ========================================
   MOBILE OPTIMIZATION - Critical Fixes
   ======================================== */

/* Fix horizontal overflow */
html, body {
  overflow-x: hidden;
  max-width: 100vw;
}

/* Mobile navigation fixes */
@media (max-width: 767px) {
  /* Navbar mobile fixes */
  .navbar .container {
    height: 64px;
    padding: 0 var(--space-4);
  }
  
  .logo {
    font-size: 1.25rem;
  }
  
  .logo img {
    height: 40px !important;
  }
  
  /* Mobile menu */
  .nav-menu {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    bottom: 0;
    background: white;
    flex-direction: column;
    padding: var(--space-6);
    gap: var(--space-4);
    transform: translateX(100%);
    transition: transform 0.3s ease;
    z-index: 100;
    overflow-y: auto;
  }
  
  .nav-menu.active {
    transform: translateX(0);
  }
  
  .nav-menu li {
    width: 100%;
  }
  
  .nav-menu a {
    display: block;
    padding: var(--space-4);
    font-size: 1.125rem;
    border-bottom: 1px solid var(--border-light);
  }
  
  .mobile-toggle {
    display: block !important;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--space-2);
    min-height: 44px;
    min-width: 44px;
  }
  
  /* Hero section mobile */
  .hero {
    min-height: auto;
    padding: 100px 0 60px;
  }
  
  .hero h1 {
    font-size: 1.75rem !important;
    line-height: 1.3;
    margin-bottom: var(--space-4);
  }
  
  .hero h1 span {
    display: block;
  }
  
  .hero-subtitle {
    font-size: 1rem !important;
    margin-bottom: var(--space-6);
  }
  
  .hero-cta {
    flex-direction: column;
    gap: var(--space-3);
  }
  
  .hero-cta .btn-primary,
  .hero-cta .btn-large {
    width: 100%;
    justify-content: center;
  }
  
  /* Counter section - stack to 2x2 then 1 column */
  .counter-grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: var(--space-4);
  }
  
  .counter-item {
    padding: var(--space-6) var(--space-4) !important;
  }
  
  .counter-number {
    font-size: 1.75rem !important;
  }
  
  .counter-label {
    font-size: 0.75rem !important;
  }
  
  /* Product grid - single column */
  .product-grid {
    grid-template-columns: 1fr !important;
  }
  
  .product-card {
    max-width: 100%;
  }
  
  .product-image {
    height: 200px;
  }
  
  /* Why choose us - single column */
  .why-grid {
    grid-template-columns: 1fr !important;
  }
  
  .why-card {
    padding: var(--space-6) !important;
  }
  
  /* Tangshan section mobile */
  .tangshan-ports [style*="grid-template-columns: 1fr 1fr"] {
    grid-template-columns: 1fr !important;
  }
  
  .tangshan-ports [style*="grid-template-columns: repeat(2"] {
    grid-template-columns: 1fr !important;
  }
  
  .tangshan-ports [style*="grid-template-columns: repeat(4"] {
    grid-template-columns: repeat(2, 1fr) !important;
  }
  
  /* Port cards stack */
  .tangshan-ports [style*="grid-template-columns: 1fr 1fr"] {
    grid-template-columns: 1fr !important;
  }
  
  /* CTA section */
  .cta-section h2 {
    font-size: 1.5rem !important;
  }
  
  .cta-section .btn-white,
  .cta-section .btn-outline-white {
    width: 100%;
    margin-bottom: var(--space-3);
  }
  
  /* Footer mobile */
  .footer-grid {
    grid-template-columns: 1fr !important;
    gap: var(--space-8);
    text-align: center;
  }
  
  .footer-col h4 {
    margin-bottom: var(--space-4);
  }
  
  /* Product pages mobile */
  [style*="display: grid"][style*="grid-template-columns: 1fr 1fr"] {
    grid-template-columns: 1fr !important;
  }
  
  [style*="height: 400px"] {
    height: 250px !important;
  }
  
  /* Specs grid mobile */
  [style*="grid-template-columns: repeat(4"] {
    grid-template-columns: repeat(2, 1fr) !important;
  }
  
  [style*="grid-template-columns: repeat(6"] {
    grid-template-columns: repeat(2, 1fr) !important;
  }
  
  [style*="grid-template-columns: repeat(8"] {
    grid-template-columns: repeat(2, 1fr) !important;
  }
  
  [style*="grid-template-columns: repeat(10"] {
    grid-template-columns: repeat(2, 1fr) !important;
  }
  
  /* Tables mobile */
  .products-table-header,
  .products-table-row {
    grid-template-columns: 1fr !important;
    gap: var(--space-2);
  }
  
  .products-table-header > div:first-child,
  .products-table-row > div:first-child {
    font-weight: 700;
    color: var(--primary-600);
  }
  
  /* Service steps mobile */
  .service-grid {
    grid-template-columns: 1fr !important;
  }
  
  .service-step::after {
    display: none !important;
  }
  
  /* About page mobile */
  .mv-grid {
    grid-template-columns: 1fr !important;
  }
  
  .profile-grid {
    grid-template-columns: 1fr !important;
  }
  
  .profile-stats {
    position: relative !important;
    bottom: auto !important;
    left: auto !important;
    transform: none !important;
    margin-top: var(--space-4);
    flex-wrap: wrap;
  }
  
  /* Stats cards */
  .stat-item {
    padding: var(--space-4) !important;
    min-width: auto;
    flex: 1 1 45%;
  }
  
  /* Language dropdown mobile */
  .language-menu {
    right: 0 !important;
    left: auto !important;
    min-width: 140px;
  }
}

/* Extra small screens */
@media (max-width: 375px) {
  .counter-grid {
    grid-template-columns: 1fr !important;
  }
  
  .hero h1 {
    font-size: 1.5rem !important;
  }
  
  .section-header h2 {
    font-size: 1.25rem !important;
  }
}

/* ========================================
   UTILITY CLASSES
   ======================================== */
.text-center { text-align: center; }
.mt-4 { margin-top: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }

/* Touch target optimization */
@media (hover: none) and (pointer: coarse) {
  a, button {
    min-height: 44px;
    min-width: 44px;
  }
  
  .nav-menu a,
  .footer-col a,
  .product-card,
  .btn-primary,
  .btn-secondary,
  .btn-outline {
    min-height: 48px;
  }
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Print styles */
@media print {
  .navbar,
  .mobile-toggle,
  .hero video,
  .cta-section,
  .footer {
    display: none !important;
  }
  
  body {
    font-size: 12pt;
    line-height: 1.5;
  }
  
  h1 { font-size: 24pt; }
  h2 { font-size: 20pt; }
  h3 { font-size: 16pt; }
}