/* ==================================================
   EMTAT LTD - PROFESSIONAL WEBSITE STYLES
   Modern, Scientific, Professional Design
   ================================================== */

:root {
  /* Brand Colors */
  --primary-color: #1e3a8a;
  --secondary-color: #3b82f6;
  --accent-color: #06b6d4;
  --highlight-color: #f59e0b;
  
  /* Neutral Colors */
  --dark-bg: #0f172a;
  --dark-secondary: #1e293b;
  --light-gray: #f8fafc;
  --medium-gray: #64748b;
  --text-dark: #1e293b;
  --text-light: #f8fafc;
  
  /* Scientific Theme Colors */
  --dna-color: #10b981;
  --molecule-color: #8b5cf6;
  --tech-color: #ec4899;
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Poppins', sans-serif;
  
  /* Spacing */
  --section-padding: 4rem 0;
  --container-padding: 0 1.5rem;
  --border-radius: 12px;
  --shadow-light: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-medium: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-heavy: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

/* ==================================================
   GLOBAL STYLES
   ================================================== */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

/* ==================================================
   TYPOGRAPHY
   ================================================== */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
}

h1 { font-size: 3.5rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 2rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1.125rem; }

p {
  margin-bottom: 1rem;
  font-size: 1.1rem;
  line-height: 1.7;
}

/* ==================================================
   LAYOUT COMPONENTS
   ================================================== */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--container-padding);
}

.section {
  padding: var(--section-padding);
}

.row {
  display: flex;
  flex-wrap: wrap;
  margin: 0 -1rem;
}

.col {
  padding: 0 1rem;
  flex: 1;
}

/* ==================================================
   HEADER & NAVIGATION
   ================================================== */

.header {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  padding: 1rem 0;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

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

.logo {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-light);
  text-decoration: none;
  position: relative;
}

.logo::before {
  content: '';
  position: absolute;
  top: 50%;
  left: -1.5rem;
  transform: translateY(-50%);
  width: 1rem;
  height: 1rem;
  background: var(--accent-color);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

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

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-link {
  color: var(--text-light);
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s ease;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -0.5rem;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-color);
  transition: width 0.3s ease;
}

.nav-link:hover::after {
  width: 100%;
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-light);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ==================================================
   BUTTONS
   ================================================== */

.btn {
  display: inline-block;
  padding: 1rem 2rem;
  background: var(--accent-color);
  color: var(--text-light);
  text-decoration: none;
  border-radius: var(--border-radius);
  font-weight: 600;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s ease;
}

.btn:hover::before {
  left: 100%;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-medium);
}

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

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

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

.btn-outline:hover {
  background: var(--accent-color);
  color: var(--text-light);
}

/* ==================================================
   CARDS & COMPONENTS
   ================================================== */

.card {
  background: white;
  border-radius: var(--border-radius);
  padding: 2rem;
  box-shadow: var(--shadow-light);
  transition: all 0.3s ease;
  height: 100%;
}

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

.card-icon {
  width: 4rem;
  height: 4rem;
  background: linear-gradient(135deg, var(--accent-color), var(--dna-color));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  position: relative;
}

.card-icon::before {
  content: '';
  position: absolute;
  inset: -2px;
  background: linear-gradient(45deg, var(--accent-color), var(--dna-color), var(--molecule-color));
  border-radius: 50%;
  z-index: -1;
  animation: rotate 3s linear infinite;
}

@keyframes rotate {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* ==================================================
   HERO SECTION
   ================================================== */

.hero {
  background: linear-gradient(135deg, var(--dark-bg) 0%, var(--primary-color) 100%);
  color: var(--text-light);
  padding: 8rem 0 4rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
  opacity: 0.3;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero-title {
  font-size: 4rem;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, var(--text-light) 0%, var(--accent-color) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.5rem;
  margin-bottom: 2rem;
  opacity: 0.9;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
}

/* ==================================================
   SECTIONS
   ================================================== */

.about-section {
  background: white;
}

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

.ip-services-section {
  background: white;
  position: relative;
}

.innovation-section {
  background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-color) 100%);
  color: var(--text-light);
}

/* ==================================================
   GRID LAYOUTS
   ================================================== */

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
}

/* ==================================================
   FEATURES & HIGHLIGHTS
   ================================================== */

.feature-item {
  text-align: center;
  padding: 2rem 1rem;
}

.feature-number {
  display: inline-block;
  width: 3rem;
  height: 3rem;
  background: var(--highlight-color);
  color: white;
  border-radius: 50%;
  line-height: 3rem;
  font-weight: bold;
  margin-bottom: 1rem;
}

/* ==================================================
   FORMS
   ================================================== */

.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--text-dark);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 1rem;
  border: 2px solid #e2e8f0;
  border-radius: var(--border-radius);
  font-size: 1rem;
  transition: border-color 0.3s ease;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--accent-color);
}

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

/* ==================================================
   FOOTER
   ================================================== */

.footer {
  background: var(--dark-bg);
  color: var(--text-light);
  padding: 3rem 0 1rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h4 {
  margin-bottom: 1rem;
  color: var(--accent-color);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 1rem;
  text-align: center;
  opacity: 0.7;
}

/* ==================================================
   ANIMATIONS & EFFECTS
   ================================================== */

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeIn 0.6s ease forwards;
}

@keyframes fadeIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.slide-in-left {
  opacity: 0;
  transform: translateX(-50px);
  animation: slideInLeft 0.6s ease forwards;
}

@keyframes slideInLeft {
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.slide-in-right {
  opacity: 0;
  transform: translateX(50px);
  animation: slideInRight 0.6s ease forwards;
}

@keyframes slideInRight {
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ==================================================
   UTILITY CLASSES
   ================================================== */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mb-5 { margin-bottom: 3rem; }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mt-5 { margin-top: 3rem; }

.hidden { display: none; }
.visible { display: block; }

/* ==================================================
   RESPONSIVE DESIGN
   ================================================== */

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: block;
  }
  
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--primary-color);
    flex-direction: column;
    padding: 1rem;
    box-shadow: var(--shadow-medium);
  }
  
  .nav-menu.active {
    display: flex;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-cta {
    flex-direction: column;
    align-items: center;
  }
  
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .col {
    margin-bottom: 2rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 1rem;
  }
  
  .section {
    padding: 2rem 0;
  }
  
  .hero {
    padding: 6rem 0 2rem;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .btn {
    padding: 0.8rem 1.5rem;
    font-size: 0.9rem;
  }
}

/* ==================================================
   SPECIAL SECTIONS & FEATURES
   ================================================== */

/* Scientific DNA helix animation */
.dna-animation {
  width: 100%;
  height: 200px;
  background: linear-gradient(90deg, 
    transparent 0%, 
    var(--dna-color) 25%, 
    var(--dna-color) 75%, 
    transparent 100%
  );
  position: relative;
  margin: 2rem 0;
  overflow: hidden;
}

.dna-animation::before,
.dna-animation::after {
  content: '';
  position: absolute;
  top: 0;
  width: 2px;
  height: 100%;
  background: var(--molecule-color);
  animation: dnaMove 3s ease-in-out infinite;
}

.dna-animation::before {
  left: 30%;
  animation-delay: 0s;
}

.dna-animation::after {
  left: 70%;
  animation-delay: 1.5s;
}

@keyframes dnaMove {
  0%, 100% { transform: translateY(-100%) scaleY(0.5); opacity: 0.3; }
  50% { transform: translateY(0%) scaleY(1); opacity: 1; }
}

/* Patent showcase section */
.patent-showcase {
  background: linear-gradient(45deg, 
    rgba(16, 185, 129, 0.1) 0%, 
    rgba(139, 92, 246, 0.1) 50%, 
    rgba(236, 72, 153, 0.1) 100%
  );
  padding: 2rem;
  border-radius: var(--border-radius);
  border: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
}

/* Innovation timeline */
.timeline {
  position: relative;
  padding: 2rem 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--accent-color);
  transform: translateX(-50%);
}

.timeline-item {
  position: relative;
  margin: 2rem 0;
  display: flex;
  align-items: center;
}

.timeline-item:nth-child(odd) {
  flex-direction: row-reverse;
}

.timeline-content {
  flex: 1;
  padding: 1.5rem;
  background: white;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-light);
  margin: 0 2rem;
  position: relative;
}

.timeline-dot {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 1rem;
  height: 1rem;
  background: var(--accent-color);
  border-radius: 50%;
  border: 3px solid white;
  box-shadow: var(--shadow-light);
}

/* File upload area */
.upload-area {
  border: 2px dashed var(--accent-color);
  border-radius: var(--border-radius);
  padding: 3rem;
  text-align: center;
  transition: all 0.3s ease;
  background: rgba(6, 182, 212, 0.05);
}

.upload-area:hover,
.upload-area.drag-over {
  border-color: var(--dna-color);
  background: rgba(16, 185, 129, 0.1);
  transform: scale(1.02);
}

.upload-icon {
  font-size: 3rem;
  color: var(--accent-color);
  margin-bottom: 1rem;
}