/* 
   Gantra.ai Landing Page Styles
   Modern, responsive design with dark/light mode support
*/

:root {
  /* Light Theme Colors */
  --primary-color: #F38B00; /* Primary Orange */
  --primary-dark: #C62828; /* Deep Red */
  --secondary-color: #FFD54F; /* Accent Yellow */
  --text-color: #2E2E2E; /* Graphite/Dark Base */
  --text-light: #6b7280;
  --bg-color: #ffffff; /* Optional White */
  --bg-secondary: #f9fafb;
  --border-color: #e5e7eb;
  --card-bg: #ffffff;
  --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  
  /* Font Settings */
  --font-primary: 'Inter', sans-serif;
  --font-secondary: 'Plus Jakarta Sans', sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 8rem;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

/* Dark Theme Colors */
[data-theme="dark"] {
  --primary-color: #F38B00; /* Primary Orange */
  --primary-dark: #C62828; /* Deep Red */
  --secondary-color: #FFD54F; /* Accent Yellow */
  --text-color: #FFFFFF; /* Optional White */
  --text-light: #d1d5db;
  --bg-color: #2E2E2E; /* Graphite/Dark Base */
  --bg-secondary: #1f2937;
  --border-color: #374151;
  --card-bg: #1f2937;
  --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  color: var(--text-color);
  background-color: var(--bg-color);
  line-height: 1.6;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

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

h1 {
  font-size: 3.5rem;
}

h2 {
  font-size: 2.5rem;
}

h3 {
  font-size: 1.75rem;
}

p {
  margin-bottom: var(--spacing-sm);
}

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

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

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-lg);
  position: relative;
}

.section-title:after {
  content: '';
  display: block;
  width: 80px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  margin: var(--spacing-sm) auto 0;
  border-radius: 2px;
}

/* Gradient Text Effect */
.gradient-text {
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* Button Styles */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  font-family: var(--font-primary);
}

.btn-primary {
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  color: white;
  box-shadow: 0 4px 14px rgba(243, 139, 0, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 6px 20px rgba(243, 139, 0, 0.4);
  transform: translateY(-2px);
  color: white;
}

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

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

/* Header/Navigation */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: rgba(var(--bg-color), 0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  transition: all var(--transition-normal);
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}

.logo a {
  display: flex;
  align-items: center;
}

.logo img {
  max-height: 40px;
  width: auto;
}

.nav-links ul {
  display: flex;
  list-style: none;
}

.nav-links li {
  margin-left: var(--spacing-md);
}

.nav-links a {
  color: var(--text-color);
  font-weight: 500;
  position: relative;
}

.nav-links a:after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  transition: width var(--transition-fast);
}

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

.theme-toggle {
  margin-left: var(--spacing-md);
  cursor: pointer;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--bg-secondary);
  transition: background-color var(--transition-fast);
}

.theme-toggle:hover {
  background-color: var(--border-color);
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 30px;
  height: 21px;
  cursor: pointer;
}

.mobile-menu-toggle span {
  display: block;
  width: 100%;
  height: 3px;
  background-color: var(--text-color);
  border-radius: 3px;
  transition: all var(--transition-fast);
}

/* Hero Section */
.hero {
  padding: calc(var(--spacing-xl) + 80px) 0 var(--spacing-xl);
  background: linear-gradient(135deg, rgba(var(--bg-color), 0.9), rgba(var(--bg-secondary), 0.9));
  position: relative;
  overflow: hidden;
}

.hero:before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.1) 0%, rgba(16, 185, 129, 0.05) 50%, transparent 70%);
  z-index: -1;
  border-radius: 50%;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.hero h1 {
  margin-bottom: var(--spacing-md);
}

.hero-subtitle {
  font-size: 1.5rem;
  color: var(--text-light);
  margin-bottom: var(--spacing-lg);
}

.hero-cta {
  margin-top: var(--spacing-md);
}

/* About Section */
.about {
  padding: var(--spacing-xl) 0;
  background-color: var(--bg-color);
}

.about-content {
  max-width: 800px;
  margin: 0 auto;
}

.about-text p {
  margin-bottom: var(--spacing-md);
  font-size: 1.1rem;
  line-height: 1.8;
}

/* Services Section */
.services {
  padding: var(--spacing-xl) 0;
  background-color: var(--bg-secondary);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-md);
}

.service-card {
  background-color: var(--card-bg);
  border-radius: 1rem;
  padding: var(--spacing-md);
  box-shadow: var(--card-shadow);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  text-align: center;
}

.service-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.service-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--primary-color);
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Process Section */
.process {
  padding: var(--spacing-xl) 0;
}

.process-steps {
  max-width: 800px;
  margin: 0 auto;
}

.process-step {
  display: flex;
  margin-bottom: var(--spacing-lg);
  position: relative;
}

.step-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  border-radius: 50%;
  font-size: 1.5rem;
  font-weight: 700;
  margin-right: var(--spacing-md);
  flex-shrink: 0;
}

.step-content {
  padding-top: 0.5rem;
}

.process-step:not(:last-child):after {
  content: '';
  position: absolute;
  top: 60px;
  left: 30px;
  width: 2px;
  height: calc(100% - 30px);
  background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
}

/* Contact Section */
.contact {
  padding: var(--spacing-xl) 0;
  background-color: var(--bg-secondary);
}

.contact-container {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--spacing-md);
}

.contact-info {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.contact-item {
  display: flex;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.contact-item i {
  font-size: 1.5rem;
  margin-right: var(--spacing-sm);
  color: var(--primary-color);
}

.contact-form {
  background-color: var(--card-bg);
  border-radius: 1rem;
  padding: var(--spacing-md);
  box-shadow: var(--card-shadow);
}

/* Footer */
.footer {
  padding: var(--spacing-md) 0;
  background-color: var(--bg-color);
  border-top: 1px solid var(--border-color);
}

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

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.animated-heading {
  animation: fadeIn 1s ease-out;
}

/* Media Queries */
@media (max-width: 992px) {
  h1 {
    font-size: 3rem;
  }
  
  h2 {
    font-size: 2.2rem;
  }
  
  .contact-container {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  h1 {
    font-size: 2.5rem;
  }
  
  h2 {
    font-size: 2rem;
  }
  
  .nav-links, .cta-button {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: flex;
  }
  
  .mobile-menu-active {
    position: fixed;
    top: 80px;
    left: 0;
    width: 100%;
    background-color: var(--bg-color);
    padding: var(--spacing-md);
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
  }
  
  .mobile-menu-active ul {
    flex-direction: column;
  }
  
  .mobile-menu-active li {
    margin: var(--spacing-sm) 0;
  }
  
  .process-step {
    flex-direction: column;
  }
  
  .step-number {
    margin-bottom: var(--spacing-sm);
  }
  
  .process-step:not(:last-child):after {
    left: 30px;
    top: 60px;
    height: calc(100% - 60px);
  }
}

@media (max-width: 576px) {
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.8rem;
  }
  
  .hero {
    padding-top: calc(var(--spacing-lg) + 80px);
  }
  
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
  
  .footer-content p:first-child {
    margin-bottom: var(--spacing-xs);
  }
}