/* ===================================================================
   KHONSAVANH TRADING INTERNATIONAL - Iron Ore Supplier Website
   Responsive CSS with Noto Sans Lao font support
   =================================================================== */

/* ===== GOOGLE FONTS - Noto Sans Lao ===== */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+Lao:wght@300;400;500;600;700&family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ===== CSS VARIABLES ===== */
:root {
  /* Colors - Professional B2B Palette */
  --primary-color: #1a4d8f;
  --primary-dark: #0f3b6e;
  --primary-light: #2a5fa5;
  --secondary-color: #d4852f;
  --secondary-dark: #b56f1f;
  --accent-color: #c94f2f;
  
  /* Neutral Colors */
  --dark: #1a1a1a;
  --dark-gray: #2d2d2d;
  --medium-gray: #666666;
  --light-gray: #e5e5e5;
  --bg-light: #f8f9fa;
  --white: #ffffff;
  
  /* Status Colors */
  --success: #28a745;
  --info: #17a2b8;
  --warning: #ffc107;
  
  /* Typography */
  --font-primary: 'Inter', 'Noto Sans Lao', sans-serif;
  --font-lao: 'Noto Sans Lao', sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 3rem;
  --spacing-xl: 5rem;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

/* ===== GLOBAL RESET ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-primary);
  line-height: 1.6;
  color: var(--dark);
  background-color: var(--white);
  overflow-x: hidden;
}

/* Lao language specific font */
body[lang="lo"],
.lang-lo {
  font-family: var(--font-lao);
}

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

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

ul {
  list-style: none;
}

/* ===== CONTAINER ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

.container-wide {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

/* ===== HEADER & NAVIGATION ===== */
.header {
  background: var(--white);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: var(--transition-normal);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) 0;
}

.logo-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo {
  height: 60px;
  width: auto;
}

.company-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary-color);
  line-height: 1.3;
  max-width: 250px;
}

.nav-menu {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
}

.nav-link {
  font-weight: 500;
  color: var(--dark);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary-color);
  background-color: rgba(26, 77, 143, 0.05);
}

/* External link indicator */
.nav-link[target="_blank"]::after {
  content: " ↗";
  font-size: 0.8em;
  opacity: 0.7;
}

/* Dropdown menu for Vehicle Trading */
.nav-item {
  position: relative;
}

.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--white);
  box-shadow: var(--shadow-md);
  border-radius: var(--radius-md);
  min-width: 200px;
  padding: 0.5rem 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: var(--transition-normal);
  z-index: 1000;
  margin-top: 0.5rem;
}

.nav-item:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1rem;
  color: var(--dark);
  font-weight: 500;
  transition: var(--transition-fast);
  white-space: nowrap;
}

.dropdown-link:hover {
  background: var(--bg-light);
  color: var(--primary-color);
}

.dropdown-link i {
  font-size: 1rem;
  width: 20px;
}

/* Download icon */
.download-icon::before {
  content: "📥";
  margin-right: 0.3rem;
}

/* View icon */
.view-icon::before {
  content: "👁️";
  margin-right: 0.3rem;
}

.lang-switcher {
  display: flex;
  gap: 0.5rem;
  padding: 0.4rem 0.8rem;
  background: var(--bg-light);
  border-radius: var(--radius-md);
}

.lang-btn {
  padding: 0.3rem 0.8rem;
  background: transparent;
  border: none;
  cursor: pointer;
  font-weight: 500;
  color: var(--medium-gray);
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
  font-size: 0.9rem;
}

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

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

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.menu-toggle span {
  display: block;
  width: 25px;
  height: 3px;
  background: var(--dark);
  border-radius: 2px;
  transition: var(--transition-fast);
}

/* ===== HERO SECTION ===== */
.hero {
  position: relative;
  height: 70vh;
  min-height: 500px;
  display: flex;
  align-items: center;
  color: var(--white);
  overflow: hidden;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 1;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(26, 77, 143, 0.85) 0%, rgba(15, 59, 110, 0.75) 100%);
  z-index: 2;
}

.hero-content {
  position: relative;
  z-index: 3;
  max-width: 800px;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  line-height: 1.2;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.5rem);
  margin-bottom: var(--spacing-md);
  opacity: 0.95;
  font-weight: 400;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-block;
  padding: 0.9rem 2rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition-normal);
  border: 2px solid transparent;
  font-size: 1rem;
  text-align: center;
}

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

.btn-primary:hover {
  background: var(--secondary-dark);
  border-color: var(--secondary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: transparent;
  color: var(--white);
  border-color: var(--white);
}

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

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

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

/* ===== SECTIONS ===== */
.section {
  padding: var(--spacing-xl) 0;
}

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

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: var(--spacing-sm);
  text-align: center;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--medium-gray);
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--spacing-lg);
  line-height: 1.7;
}

/* ===== ABOUT SECTION (HOME) ===== */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: center;
}

.about-text h2 {
  font-size: 2rem;
  color: var(--primary-color);
  margin-bottom: var(--spacing-sm);
}

.about-text p {
  color: var(--dark-gray);
  margin-bottom: var(--spacing-md);
  line-height: 1.8;
}

.about-features {
  list-style: none;
}

.about-features li {
  padding: 0.7rem 0;
  padding-left: 2rem;
  position: relative;
  color: var(--dark-gray);
}

.about-features li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--success);
  font-weight: bold;
  font-size: 1.2rem;
}

.about-image img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ===== PRODUCTS GRID ===== */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.product-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
}

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

.product-image {
  height: 200px;
  overflow: hidden;
}

.product-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-normal);
}

.product-card:hover .product-image img {
  transform: scale(1.05);
}

.product-info {
  padding: var(--spacing-md);
}

.product-name {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

.product-description {
  color: var(--medium-gray);
  margin-bottom: var(--spacing-sm);
  font-size: 0.95rem;
}

.product-specs {
  background: var(--bg-light);
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
}

.product-specs strong {
  color: var(--dark);
}

/* ===== WHY CHOOSE SECTION ===== */
.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.why-item {
  background: var(--white);
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
}

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

.why-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-sm);
  color: var(--white);
  font-size: 1.5rem;
}

.why-item h3 {
  font-size: 1.2rem;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

.why-item p {
  color: var(--medium-gray);
  line-height: 1.6;
}

/* ===== SPECIFICATIONS TABLE ===== */
.spec-table {
  width: 100%;
  background: var(--white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  margin: var(--spacing-md) 0;
}

.spec-table table {
  width: 100%;
  border-collapse: collapse;
}

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

.spec-table th {
  background: var(--primary-color);
  color: var(--white);
  font-weight: 600;
}

.spec-table tr:last-child td {
  border-bottom: none;
}

.spec-table tr:hover {
  background: var(--bg-light);
}

/* ===== CONTACT FORM ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.contact-form {
  background: var(--white);
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.form-group {
  margin-bottom: var(--spacing-sm);
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--dark);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.8rem;
  border: 1px solid var(--light-gray);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 1rem;
  transition: var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(26, 77, 143, 0.1);
}

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

.contact-info {
  background: var(--primary-color);
  color: var(--white);
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  height: fit-content;
}

.contact-info h3 {
  margin-bottom: var(--spacing-sm);
  font-size: 1.5rem;
}

.info-item {
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: flex-start;
  gap: 0.8rem;
}

.info-icon {
  font-size: 1.2rem;
  margin-top: 0.2rem;
}

.info-text h4 {
  font-size: 0.9rem;
  font-weight: 500;
  opacity: 0.9;
  margin-bottom: 0.2rem;
}

.info-text p {
  font-size: 1rem;
  line-height: 1.5;
}

/* ===== LOGISTICS ROUTES ===== */
.routes-list {
  margin-top: var(--spacing-md);
}

.route-item {
  background: var(--white);
  padding: var(--spacing-sm);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-sm);
  box-shadow: var(--shadow-sm);
  border-left: 4px solid var(--primary-color);
}

.route-item h4 {
  color: var(--primary-color);
  margin-bottom: 0.3rem;
  font-size: 1rem;
}

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

/* ===== CTA SECTION ===== */
.cta-section {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: var(--white);
  text-align: center;
  padding: var(--spacing-xl) 0;
}

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

.cta-section p {
  max-width: 600px;
  margin: 0 auto var(--spacing-md);
  opacity: 0.95;
  font-size: 1.1rem;
}

/* ===== FOOTER ===== */
.footer {
  background: var(--dark);
  color: var(--white);
  padding: var(--spacing-lg) 0 var(--spacing-sm);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.footer-section h3 {
  margin-bottom: var(--spacing-sm);
  color: var(--secondary-color);
}

.footer-section p,
.footer-section a {
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.8;
  font-size: 0.95rem;
}

.footer-section a:hover {
  color: var(--secondary-color);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-sm);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9rem;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 968px) {
  .nav-menu {
    position: fixed;
    top: 80px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 80px);
    background: var(--white);
    flex-direction: column;
    padding: var(--spacing-md);
    box-shadow: var(--shadow-lg);
    transition: left var(--transition-normal);
    overflow-y: auto;
  }
  
  .nav-menu.active {
    left: 0;
  }
  
  .menu-toggle {
    display: flex;
  }
  
  .about-content {
    grid-template-columns: 1fr;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
  }
  
  .hero {
    height: 60vh;
    min-height: 400px;
  }
}

@media (max-width: 640px) {
  :root {
    --spacing-xl: 3rem;
    --spacing-lg: 2rem;
  }
  
  .logo {
    height: 50px;
  }
  
  .company-name {
    font-size: 0.8rem;
    max-width: 180px;
  }
  
  .hero-cta {
    flex-direction: column;
  }
  
  .btn {
    padding: 0.8rem 1.5rem;
    font-size: 0.95rem;
  }
  
  .products-grid {
    grid-template-columns: 1fr;
  }
  
  .why-grid {
    grid-template-columns: 1fr;
  }
  
  .spec-table th,
  .spec-table td {
    padding: 0.7rem;
    font-size: 0.9rem;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
}

/* ===== UTILITY CLASSES ===== */
.text-center {
  text-align: center;
}

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }

.hidden {
  display: none !important;
}

/* ===== LOADING ANIMATION ===== */
.loading {
  opacity: 0;
  animation: fadeIn 0.3s ease forwards;
}

@keyframes fadeIn {
  to {
    opacity: 1;
  }
}