/* DigiTechInnov - Smart Digital Solutions */
/* Core CSS with Variables, Animations, and Base Styles */

/* CSS Variables */
:root {
  /* Brand Colors */
  --tech-blue: #1e90ff;
  --lime-green: #a4c639;
  --graphite-grey: #333333;
  --white: #ffffff;
  --light-grey: #f8f9fa;
  --dark-grey: #666666;
  --border-light: #e9ecef;
  
  /* Typography */
  --font-heading: 'Montserrat', sans-serif;
  --font-body: 'Lato', sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 3rem;
  --spacing-xl: 4rem;
  
  /* Border Radius */
  --border-radius: 8px;
  --border-radius-lg: 12px;
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.2);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--graphite-grey);
  background-color: var(--white);
}

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

h1 {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
}

h2 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
}

h4 {
  font-size: 1.5rem;
}

h5 {
  font-size: 1.25rem;
}

h6 {
  font-size: 1rem;
}

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

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

a:hover {
  color: var(--lime-green);
}

a:focus {
  outline: 2px solid var(--lime-green);
  outline-offset: 2px;
}

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

.section {
  padding: var(--spacing-xl) 0;
}

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

/* Grid System */
.row {
  display: flex;
  flex-wrap: wrap;
  margin: 0 -var(--spacing-sm);
}

.col {
  flex: 1;
  padding: 0 var(--spacing-sm);
}

.col-1 { flex: 0 0 8.333333%; }
.col-2 { flex: 0 0 16.666667%; }
.col-3 { flex: 0 0 25%; }
.col-4 { flex: 0 0 33.333333%; }
.col-6 { flex: 0 0 50%; }
.col-8 { flex: 0 0 66.666667%; }
.col-9 { flex: 0 0 75%; }
.col-12 { flex: 0 0 100%; }

/* Header Styles */
.header {
  background-color: var(--white);
  box-shadow: var(--shadow-sm);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  transition: all var(--transition-normal);
}

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

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

.logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--tech-blue);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-md);
}

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

.nav-link:hover,
.nav-link.active {
  background-color: var(--tech-blue);
  color: var(--white);
}

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

/* Button Styles */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-md);
  font-family: var(--font-heading);
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

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

.btn-primary:hover {
  background-color: var(--lime-green);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

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

.btn-lg {
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: 1.125rem;
}

/* Card Styles */
.card {
  background-color: var(--white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--spacing-md);
  transition: all var(--transition-normal);
  height: 100%;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card-header {
  margin-bottom: var(--spacing-sm);
}

.card-icon {
  width: 60px;
  height: 60px;
  background-color: var(--tech-blue);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-sm);
  color: var(--white);
  font-size: 1.5rem;
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--tech-blue) 0%, var(--lime-green) 100%);
  color: var(--white);
  padding: calc(var(--spacing-xl) * 2) 0 var(--spacing-xl);
  margin-top: 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.1);
  z-index: 1;
}

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

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: var(--spacing-md);
}

.hero p {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-lg);
  opacity: 0.9;
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.scroll-animate {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

.scroll-animate.animate {
  opacity: 1;
  transform: translateY(0);
}

/* Testimonials */
.testimonial {
  background-color: var(--white);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
  text-align: center;
  margin-bottom: var(--spacing-md);
}

.testimonial-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  margin: 0 auto var(--spacing-sm);
  background-color: var(--light-grey);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--tech-blue);
}

.testimonial-quote {
  font-style: italic;
  margin-bottom: var(--spacing-sm);
  color: var(--dark-grey);
}

.testimonial-author {
  font-weight: 600;
  color: var(--graphite-grey);
}

/* Footer */
.footer {
  background-color: var(--graphite-grey);
  color: var(--white);
  padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer h4 {
  color: var(--lime-green);
  margin-bottom: var(--spacing-sm);
}

.footer a {
  color: var(--white);
  opacity: 0.8;
  transition: opacity var(--transition-fast);
}

.footer a:hover {
  opacity: 1;
  color: var(--lime-green);
}

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

/* Scroll to Top Button */
.scroll-to-top {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background-color: var(--tech-blue);
  color: var(--white);
  border: none;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  font-size: 1.2rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: 1000;
}

.scroll-to-top.show {
  opacity: 1;
  visibility: visible;
}

.scroll-to-top:hover {
  background-color: var(--lime-green);
  transform: translateY(-2px);
}

/* Form Styles */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
  color: var(--graphite-grey);
}

.form-control {
  width: 100%;
  padding: var(--spacing-sm);
  border: 2px solid var(--border-light);
  border-radius: var(--border-radius);
  font-family: var(--font-body);
  font-size: 1rem;
  transition: border-color var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--tech-blue);
  box-shadow: 0 0 0 3px rgba(30, 144, 255, 0.1);
}

.form-control.error {
  border-color: #dc3545;
}

.error-message {
  color: #dc3545;
  font-size: 0.875rem;
  margin-top: var(--spacing-xs);
}

/* Accordion Styles */
.accordion {
  border: 1px solid var(--border-light);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.accordion-item {
  border-bottom: 1px solid var(--border-light);
}

.accordion-item:last-child {
  border-bottom: none;
}

.accordion-header {
  background: none;
  border: none;
  width: 100%;
  padding: var(--spacing-md);
  text-align: left;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.125rem;
  cursor: pointer;
  transition: background-color var(--transition-fast);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.accordion-header:hover {
  background-color: var(--light-grey);
}

.accordion-header:focus {
  outline: 2px solid var(--lime-green);
  outline-offset: -2px;
}

.accordion-content {
  padding: 0 var(--spacing-md) var(--spacing-md);
  display: none;
}

.accordion-content.active {
  display: block;
}

.accordion-icon {
  transition: transform var(--transition-fast);
}

.accordion-header[aria-expanded="true"] .accordion-icon {
  transform: rotate(180deg);
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .hero p {
    font-size: 1.125rem;
  }
  
  h1 {
    font-size: 2.5rem;
  }
  
  h2 {
    font-size: 2rem;
  }
  
  h3 {
    font-size: 1.5rem;
  }
  
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--white);
    box-shadow: var(--shadow-md);
    flex-direction: column;
    padding: var(--spacing-sm);
    gap: 0;
  }
  
  .nav-menu.active {
    display: flex;
  }
  
  .nav-link {
    padding: var(--spacing-sm);
    border-radius: 0;
    border-bottom: 1px solid var(--border-light);
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  .row {
    flex-direction: column;
  }
  
  .col,
  .col-1,
  .col-2,
  .col-3,
  .col-4,
  .col-6,
  .col-8,
  .col-9,
  .col-12 {
    flex: 0 0 100%;
    margin-bottom: var(--spacing-md);
  }
  
  .btn-lg {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: var(--spacing-xl) 0;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .section {
    padding: var(--spacing-md) 0;
  }
  
  .card {
    padding: var(--spacing-sm);
  }
}

/* Utility Classes */
.text-center {
  text-align: center;
}

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

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

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-inline-block { display: inline-block; }

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

.w-100 { width: 100%; }
.h-100 { height: 100%; }

/* Video Responsive */
.video-container {
  position: relative;
  width: 100%;
  height: 0;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  overflow: hidden;
  border-radius: var(--border-radius);
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

/* Lazy Loading */
.lazy {
  opacity: 0;
  transition: opacity 0.3s;
}

.lazy.loaded {
  opacity: 1;
}

/* Accordion Styles */
.accordion {
    max-width: 100%;
}

.accordion-item {
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-sm);
    overflow: hidden;
}

.accordion-header {
    width: 100%;
    padding: var(--spacing-md);
    background: white;
    border: none;
    text-align: left;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--graphite-grey);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color var(--transition-normal);
}

.accordion-header:hover {
    background-color: var(--light-grey);
}

.accordion-header:focus {
    outline: 2px solid var(--lime-green);
    outline-offset: -2px;
}

.accordion-header[aria-expanded="true"] {
    background-color: var(--tech-blue);
    color: white;
}

.accordion-icon {
    transition: transform var(--transition-normal);
    font-size: 1rem;
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    padding: 0 var(--spacing-md);
    background: white;
    transition: max-height 0.3s ease-out, padding 0.3s ease-out;
}

.accordion-content.active {
    max-height: 1000px;
    padding: var(--spacing-md);
}

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

.accordion-content ul {
    margin: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
}

.accordion-content li {
    margin-bottom: var(--spacing-xs);
}

/* Scroll to Top Button */
.scroll-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--tech-blue) 0%, var(--lime-green) 100%);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal);
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

.scroll-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-to-top:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.scroll-to-top:focus {
    outline: 2px solid var(--lime-green);
    outline-offset: 2px;
}

/* Header Scroll Effect */
.header.scrolled {
    box-shadow: var(--shadow-md);
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
}

/* Additional Text Colors */
.text-muted {
    color: var(--dark-grey);
}

/* Testimonial Enhancements */
.testimonial-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--tech-blue) 0%, var(--lime-green) 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    font-size: 1.5rem;
}

.testimonial-quote {
    font-style: italic;
    margin-bottom: var(--spacing-md);
    flex-grow: 1;
    display: flex;
    align-items: center;
}

.testimonial-author {
    font-size: 0.875rem;
    color: var(--dark-grey);
}

/* Video Container Enhancements */
.video-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, var(--light-grey) 25%, transparent 25%), 
                linear-gradient(-45deg, var(--light-grey) 25%, transparent 25%), 
                linear-gradient(45deg, transparent 75%, var(--light-grey) 75%), 
                linear-gradient(-45deg, transparent 75%, var(--light-grey) 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    opacity: 0.1;
    z-index: 1;
}

.video-container iframe {
    z-index: 2;
}

/* Mobile Responsive Enhancements */
@media (max-width: 768px) {
    .accordion-header {
        font-size: 1rem;
        padding: var(--spacing-sm);
    }
    
    .accordion-content {
        padding: 0 var(--spacing-sm);
    }
    
    .accordion-content.active {
        padding: var(--spacing-sm);
    }
    
    .testimonial {
        padding: var(--spacing-md);
    }
    
    .scroll-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
        font-size: 1.25rem;
    }
}