/* ============================================
   Jieneng Industrial - Foreign Trade Website
   Global Styles
   ============================================ */

/* --- Design Tokens --- */
:root {
  /* Primary Colors - Industrial Blue */
  --color-primary: #0B3D91;
  --color-primary-dark: #082C6B;
  --color-primary-light: #1565C0;

  /* Accent - Safety Orange (industrial warning) */
  --color-accent: #E65100;
  --color-accent-dark: #BF360C;
  --color-accent-light: #FF6D00;

  /* Neutrals */
  --color-white: #FFFFFF;
  --color-gray-50: #F8F9FA;
  --color-gray-100: #F1F3F5;
  --color-gray-200: #E9ECEF;
  --color-gray-300: #DEE2E6;
  --color-gray-400: #ADB5BD;
  --color-gray-500: #6C757D;
  --color-gray-600: #495057;
  --color-gray-700: #343A40;
  --color-gray-800: #212529;
  --color-black: #111111;

  /* Functional */
  --color-success: #2E7D32;
  --color-warning: #F9A825;

  /* Typography */
  --font-heading: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-body: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;

  /* Spacing */
  --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;

  /* Layout */
  --max-width: 1200px;
  --header-height: 80px;

  /* Borders & Shadows */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-gray-700);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
  color: var(--color-primary-light);
}

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  font-size: inherit;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-gray-800);
}

h1 { font-size: var(--text-5xl); margin-bottom: var(--space-6); }
h2 { font-size: var(--text-4xl); margin-bottom: var(--space-5); }
h3 { font-size: var(--text-2xl); margin-bottom: var(--space-4); }
h4 { font-size: var(--text-xl); margin-bottom: var(--space-3); }

p {
  margin-bottom: var(--space-4);
}

.text-sm { font-size: var(--text-sm); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }
.text-center { text-align: center; }
.text-white { color: var(--color-white); }
.text-primary { color: var(--color-primary); }
.text-accent { color: var(--color-accent); }
.text-gray { color: var(--color-gray-500); }

/* --- Layout --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section {
  padding: var(--space-20) 0;
}

.section-gray {
  background-color: var(--color-gray-50);
}

.section-dark {
  background-color: var(--color-gray-800);
  color: var(--color-white);
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--space-16);
}

.section-header h2 {
  position: relative;
  display: inline-block;
}

.section-header h2::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: var(--color-accent);
  margin: var(--space-4) auto 0;
  border-radius: 2px;
}

.section-header p {
  color: var(--color-gray-500);
  font-size: var(--text-lg);
  margin-top: var(--space-4);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-8);
  font-weight: 600;
  font-size: var(--text-base);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  white-space: nowrap;
  text-decoration: none;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  color: var(--color-white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.btn-accent:hover {
  background-color: var(--color-accent-dark);
  color: var(--color-white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

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

.btn-lg {
  padding: var(--space-4) var(--space-10);
  font-size: var(--text-lg);
  border-radius: var(--radius-lg);
}

/* --- Header / Navigation --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
  z-index: 1000;
  transition: box-shadow var(--transition-base);
}

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

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

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--color-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-weight: 800;
  font-size: var(--text-lg);
}

.logo-text {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-gray-800);
}

.logo-text span {
  color: var(--color-primary);
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-links {
  display: flex;
  gap: var(--space-6);
}

.nav-links a {
  font-weight: 500;
  color: var(--color-gray-600);
  padding: var(--space-2) 0;
  position: relative;
}

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

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

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

/* Mobile menu toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-gray-700);
  transition: all var(--transition-base);
}

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 600px;
  display: flex;
  align-items: center;
  margin-top: var(--header-height);
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 60%, var(--color-primary-light) 100%);
  color: var(--color-white);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background: url('../images/hero-bg.svg') no-repeat center right / cover;
  opacity: 0.1;
}

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

.hero-content {
  max-width: 650px;
  padding: var(--space-16) 0;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(10px);
  padding: var(--space-2) var(--space-4);
  border-radius: 100px;
  font-size: var(--text-sm);
  font-weight: 500;
  margin-bottom: var(--space-6);
}

.hero h1 {
  color: var(--color-white);
  font-size: var(--text-5xl);
  margin-bottom: var(--space-6);
  line-height: 1.1;
}

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

.hero p {
  font-size: var(--text-lg);
  opacity: 0.9;
  margin-bottom: var(--space-8);
  max-width: 520px;
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  gap: var(--space-12);
  margin-top: var(--space-12);
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255,255,255,0.2);
}

.hero-stat-value {
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--color-white);
}

.hero-stat-label {
  font-size: var(--text-sm);
  opacity: 0.8;
  margin-top: var(--space-1);
}

/* --- Product Cards --- */
.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.product-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-gray-200);
  transition: all var(--transition-base);
}

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

.product-card-image {
  width: 100%;
  height: 220px;
  background: var(--color-gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

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

.product-card-image .placeholder {
  font-size: var(--text-4xl);
  color: var(--color-gray-400);
}

.product-card-body {
  padding: var(--space-6);
}

.product-card-tag {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  background: var(--color-primary);
  color: var(--color-white);
  font-size: var(--text-xs);
  font-weight: 600;
  border-radius: 100px;
  margin-bottom: var(--space-3);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.product-card-title {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-gray-800);
  margin-bottom: var(--space-2);
}

.product-card-desc {
  font-size: var(--text-sm);
  color: var(--color-gray-500);
  margin-bottom: var(--space-4);
  line-height: 1.5;
}

.product-card-specs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}

.product-card-spec {
  font-size: var(--text-xs);
  padding: var(--space-1) var(--space-2);
  background: var(--color-gray-100);
  color: var(--color-gray-600);
  border-radius: var(--radius-sm);
}

.product-card-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--color-primary);
}

.product-card-link:hover {
  gap: var(--space-3);
}

/* --- Features / Advantages --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.feature-card {
  padding: var(--space-8);
  background: var(--color-white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-gray-200);
  transition: all var(--transition-base);
}

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

.feature-icon {
  width: 56px;
  height: 56px;
  background: var(--color-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-5);
  font-size: var(--text-2xl);
}

.feature-title {
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.feature-desc {
  font-size: var(--text-sm);
  color: var(--color-gray-500);
  line-height: 1.6;
}

/* --- Certifications --- */
.certs-grid {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-8);
}

.cert-item {
  text-align: center;
  padding: var(--space-6);
  background: rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  min-width: 140px;
}

.cert-icon {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-3);
}

.cert-name {
  font-size: var(--text-sm);
  font-weight: 600;
}

/* --- CTA Section --- */
.cta-section {
  background: linear-gradient(135deg, var(--color-accent-dark), var(--color-accent));
  color: var(--color-white);
  text-align: center;
  padding: var(--space-20) 0;
}

.cta-section h2 {
  color: var(--color-white);
  margin-bottom: var(--space-4);
}

.cta-section p {
  font-size: var(--text-lg);
  opacity: 0.9;
  margin-bottom: var(--space-8);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* --- Footer --- */
.footer {
  background: var(--color-gray-800);
  color: var(--color-gray-400);
  padding: var(--space-16) 0 var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

.footer-brand p {
  font-size: var(--text-sm);
  line-height: 1.7;
  margin-top: var(--space-4);
}

.footer-title {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-white);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--space-4);
}

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

.footer-links a {
  color: var(--color-gray-400);
  font-size: var(--text-sm);
  transition: color var(--transition-fast);
}

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

.footer-contact li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
  font-size: var(--text-sm);
}

.footer-contact .icon {
  flex-shrink: 0;
  width: 20px;
  text-align: center;
}

.footer-bottom {
  border-top: 1px solid var(--color-gray-700);
  padding-top: var(--space-8);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--text-sm);
}

/* --- WhatsApp Float --- */
.whatsapp-float {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  width: 60px;
  height: 60px;
  background: #25D366;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  z-index: 999;
  transition: transform var(--transition-base);
}

.whatsapp-float:hover {
  transform: scale(1.1);
}

.whatsapp-float svg {
  width: 32px;
  height: 32px;
  fill: white;
}

/* --- Product Detail Page --- */
.product-hero {
  margin-top: var(--header-height);
  padding: var(--space-16) 0;
  background: var(--color-gray-50);
}

.product-hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: start;
}

.product-gallery {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-gray-200);
}

.product-gallery-main {
  width: 100%;
  aspect-ratio: 4/3;
  background: var(--color-gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
}

.product-gallery-main img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.product-info h1 {
  font-size: var(--text-3xl);
}

.product-tag {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  background: var(--color-accent);
  color: var(--color-white);
  font-size: var(--text-xs);
  font-weight: 600;
  border-radius: 100px;
  margin-bottom: var(--space-4);
}

.product-description {
  font-size: var(--text-lg);
  color: var(--color-gray-600);
  margin-bottom: var(--space-6);
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-6);
}

.spec-table tr {
  border-bottom: 1px solid var(--color-gray-200);
}

.spec-table td {
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
}

.spec-table td:first-child {
  font-weight: 600;
  color: var(--color-gray-700);
  width: 40%;
  background: var(--color-gray-50);
}

.product-cta {
  display: flex;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

/* --- FAQ --- */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--color-gray-200);
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: var(--space-5) 0;
  font-weight: 600;
  font-size: var(--text-base);
  color: var(--color-gray-800);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-question::after {
  content: '+';
  font-size: var(--text-xl);
  color: var(--color-primary);
  transition: transform var(--transition-base);
}

.faq-item.active .faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow);
}

.faq-answer-inner {
  padding-bottom: var(--space-5);
  color: var(--color-gray-600);
  font-size: var(--text-sm);
  line-height: 1.7;
}

/* --- Contact Form --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
}

.form-group {
  margin-bottom: var(--space-5);
}

.form-group label {
  display: block;
  font-weight: 600;
  font-size: var(--text-sm);
  margin-bottom: var(--space-2);
  color: var(--color-gray-700);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  transition: border-color var(--transition-fast);
  background: var(--color-white);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(11, 61, 145, 0.1);
}

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

/* --- Responsive --- */
@media (max-width: 1024px) {
  .products-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }
  .product-hero .container {
    grid-template-columns: 1fr;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }
  h1 { font-size: var(--text-3xl); }
  h2 { font-size: var(--text-2xl); }
  .hero h1 { font-size: var(--text-3xl); }
  .hero-stats { gap: var(--space-6); }
  .hero-stat-value { font-size: var(--text-2xl); }
  .section { padding: var(--space-12) 0; }
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .products-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: var(--space-6); }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; text-align: center; }
}

/* --- Utility --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}