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

/* Performance optimizations */
* {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  loading: lazy;
}

/* Root Variables for Theme and Consistency */
:root {
  /* Color Palette */
  --primary-color: #004080; /* Deep Blue for trust and professionalism */
  --secondary-color: #00aaff; /* Bright Blue for accents and highlights */
  --accent-color: #ff6b35; /* Orange accent for highlights */
  --success-color: #28a745; /* Green for success states */
  --warning-color: #ffc107; /* Yellow for warnings */
  --error-color: #dc3545; /* Red for errors */
  --background-color: #f9f9f9; /* Light Background for a clean look */
  --text-color: #333333; /* Dark Text for readability */
  --secondary-text-color: #555555; /* Lighter Text for secondary information */
  --cta-color: #007bff; /* Call-to-Action Button Color */
  --cta-hover-color: #0056b3; /* CTA Button Hover Color */
  --dark-background: #121212; /* Dark Mode Background */
  --dark-text: #ffffff; /* Dark Mode Text */
  --form-border: #cccccc; /* Form Border Color */
  --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --card-shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  
  /* Typography */
  --font-family: 'Roboto', sans-serif;
  --heading-font: 'Roboto Slab', serif;
  
  /* Spacing */
  --section-padding: 60px;
  --container-max-width: 1200px;
  --content-width: 90%;
  
  /* Transition */
  --transition-speed: 0.3s;
  
  /* Breakpoints */
  --breakpoint-sm: 600px;
  --breakpoint-md: 900px;
}

/* Dark Mode Variables */
body.dark-mode {
  background-color: var(--dark-background);
  color: var(--dark-text);
}

/* Google Form iFrame Styling */
.google-form-container iframe {
  background-color: var(--background-color);
  transition: background-color var(--transition-speed);
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

body.dark-mode .google-form-container iframe {
  background-color: var(--dark-background);
  filter: invert(0.9) hue-rotate(180deg);
}

body.dark-mode header,
body.dark-mode footer {
  background-color: var(--primary-color);
}

body.dark-mode nav a {
  color: var(--dark-text);
}

body.dark-mode nav a:hover {
  color: var(--secondary-color);
}

body.dark-mode #dark-mode-toggle {
  background-color: var(--dark-text);
  color: var(--dark-background);
}

/* Global Styles */
html {
  scroll-behavior: smooth;
}

/* Skip Link for Accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary-color);
  color: white;
  padding: 8px;
  text-decoration: none;
  border-radius: 4px;
  z-index: 1000;
  transition: top var(--transition-speed);
}

.skip-link:focus {
  top: 6px;
}

body {
  font-family: var(--font-family);
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.6;
  margin: 0;
  padding: 0;
  transition: background-color var(--transition-speed), color var(--transition-speed);
  overflow-x: hidden;
}

.container {
  width: var(--content-width);
  max-width: var(--container-max-width);
  margin: 0 auto;
}

/* Header */
header {
  width: 100%;
  padding: 20px 0;
  background-color: var(--primary-color);
  color: #ffffff;
  transition: background-color var(--transition-speed);
}

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

header .logo {
  max-width: 150px;
  height: auto;
  display: block;
}

header .logo img {
  width: 100%;
  height: auto;
  display: block;
}

/* Adjust the SVG logo size */
header .logo svg {
  width: 100%;
  height: auto;
}

/* Navigation */
nav ul {
  list-style: none;
  display: flex;
  gap: 25px;
}

nav a {
  color: #ffffff;
  text-decoration: none;
  font-weight: bold;
  font-size: 1rem;
  transition: color var(--transition-speed);
}

nav a:hover,
nav a:focus {
  color: var(--secondary-color);
  outline: none;
}

/* Dark Mode Toggle Button */
#dark-mode-toggle {
  background-color: var(--secondary-color);
  color: #ffffff;
  border: none;
  padding: 10px 20px;
  border-radius: 25px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: background-color var(--transition-speed), transform var(--transition-speed);
}

#dark-mode-toggle:hover,
#dark-mode-toggle:focus {
  background-color: var(--cta-hover-color);
  transform: scale(1.05);
  outline: none;
}

/* Main Section Styles */
#hero {
  position: relative;
  padding: var(--section-padding) 0;
  text-align: center;
  color: var(--text-color);
  background-color: var(--background-color);
  transition: background-color var(--transition-speed), color var(--transition-speed);
}

section {
  position: relative;
  padding: var(--section-padding) 0;
  text-align: left;
  color: var(--text-color);
  background-color: var(--background-color);
  transition: background-color var(--transition-speed), color var(--transition-speed);
}

.dark-mode #hero,
.dark-mode section {
  background-color: var(--dark-background);
  color: var(--dark-text);
}

#hero h1,
section h1 {
  font-family: var(--heading-font);
  font-size: 3rem;
  margin-bottom: 20px;
  color: var(--primary-color);
}

#hero p,
section p {
  font-size: 1.2rem;
  margin-bottom: 20px;
  color: var(--secondary-text-color);
}

.dark-mode #hero p,
.dark-mode section p,
.dark-mode #services li p,
.dark-mode #technologies li p {
  color: var(--dark-text);
}

.cta {
  background-color: var(--cta-color);
  color: #ffffff;
  padding: 15px 30px;
  text-decoration: none;
  border-radius: 30px;
  font-size: 1rem;
  display: inline-block;
  transition: background-color var(--transition-speed), transform var(--transition-speed);
}

.cta:hover,
.cta:focus {
  background-color: var(--cta-hover-color);
  transform: translateY(-3px);
  outline: none;
}

/* Sections */
section {
  padding: var(--section-padding) 0;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.8s ease-out forwards;
}

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

/* Stagger animation for sections */
section:nth-of-type(1) { animation-delay: 0.1s; }
section:nth-of-type(2) { animation-delay: 0.2s; }
section:nth-of-type(3) { animation-delay: 0.3s; }
section:nth-of-type(4) { animation-delay: 0.4s; }
section:nth-of-type(5) { animation-delay: 0.5s; }
section:nth-of-type(6) { animation-delay: 0.6s; }
section:nth-of-type(7) { animation-delay: 0.7s; }

section h2 {
  font-family: var(--heading-font);
  font-size: 2rem;
  margin-bottom: 20px;
  color: var(--primary-color);
  text-align: center;
}


section p {
  font-size: 1.1rem;
  color: var(--secondary-text-color);
  max-width: 800px;
  margin: 0 auto 20px;
}

.about-highlights {
  list-style: none;
  margin: 30px auto 0;
  padding: 0;
  max-width: 800px;
  display: grid;
  gap: 16px;
}

.about-highlights li {
  background: #ffffff;
  border-radius: 12px;
  padding: 18px 20px;
  box-shadow: var(--card-shadow);
  color: var(--secondary-text-color);
  border: 1px solid var(--form-border);
}

.about-highlights strong {
  display: block;
  color: var(--primary-color);
  margin-bottom: 6px;
}

.dark-mode .about-highlights li {
  background: var(--dark-background);
  border-color: var(--primary-color);
  color: var(--dark-text);
}

/* Services and Technologies Sections */
#services ul,
#technologies ul {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  padding: 0;
}

#services li,
#technologies li {
  background-color: #ffffff;
  border: 1px solid var(--form-border);
  border-radius: 15px;
  padding: 30px;
  text-align: left;
  transition: all var(--transition-speed);
  box-shadow: var(--card-shadow);
  position: relative;
  overflow: hidden;
}

#services li::before,
#technologies li::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  transform: scaleX(0);
  transition: transform var(--transition-speed);
}

#services li:hover::before,
#technologies li:hover::before {
  transform: scaleX(1);
}

#services li:hover,
#technologies li:hover,
#services li:focus-within,
#technologies li:focus-within {
  transform: translateY(-8px);
  box-shadow: var(--card-shadow-hover);
  border-color: var(--secondary-color);
}

#services li h3,
#technologies li h3 {
  color: var(--primary-color);
  margin-bottom: 10px;
}

@media (min-width: var(--breakpoint-sm)) {
  #services ul,
  #technologies ul {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: var(--breakpoint-md)) {
  #services ul,
  #technologies ul {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Statistics Section */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.stat-item {
  text-align: center;
  padding: 30px 20px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  border-radius: 15px;
  box-shadow: var(--card-shadow);
  transition: all var(--transition-speed);
}

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

.stat-number {
  font-size: 3rem;
  font-weight: bold;
  margin-bottom: 10px;
  font-family: var(--heading-font);
}

.stat-label {
  font-size: 1.1rem;
  opacity: 0.9;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Case Study */
.case-study-highlights {
  list-style: disc;
  margin: 30px auto;
  max-width: 800px;
  padding-left: 25px;
  color: var(--secondary-text-color);
}

.case-study-highlights li {
  margin-bottom: 12px;
  line-height: 1.6;
}

.case-study-highlights li::marker {
  color: var(--primary-color);
  font-size: 1.2rem;
}

/* Contact Form */
#contact form {
  background-color: #ffffff;
  padding: 30px;
  border-radius: 10px;
  max-width: 600px;
  margin: 0 auto;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

#contact form label {
  font-weight: bold;
  margin-bottom: 5px;
  display: block;
  color: var(--text-color);
}

#contact form input,
#contact form textarea {
  width: 100%;
  padding: 12px 15px;
  margin-bottom: 20px;
  border: 1px solid var(--form-border);
  border-radius: 5px;
  font-size: 1rem;
  transition: border-color var(--transition-speed), box-shadow var(--transition-speed);
}

#contact form input:focus,
#contact form textarea:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 5px rgba(0, 64, 128, 0.5);
  outline: none;
}

#contact form button {
  background-color: var(--cta-color);
  color: #ffffff;
  padding: 15px 25px;
  border: none;
  border-radius: 30px;
  cursor: pointer;
  font-size: 1rem;
  transition: background-color var(--transition-speed), transform var(--transition-speed);
}

#contact form button:hover,
#contact form button:focus {
  background-color: var(--cta-hover-color);
  transform: translateY(-3px);
  outline: none;
}

/* Error Messages */
.error-message {
  color: red;
  font-size: 0.9rem;
  margin-top: 5px;
  display: block;
}

/* Loading Indicator */
#loading-indicator {
  margin-top: 10px;
  font-style: italic;
  color: var(--secondary-color);
}

/* Modern Loading Spinner */
.loading-spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(0, 170, 255, 0.3);
  border-radius: 50%;
  border-top-color: var(--secondary-color);
  animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Pulse animation for CTAs */
.pulse {
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

/* Hidden Class */
.hidden {
  display: none;
}

/* Hero Section */
.hero-container {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  color: white;
  border-radius: 20px;
  margin: 20px auto;
  padding: 80px 40px;
  box-shadow: var(--card-shadow-hover);
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0.1;
  z-index: 1;
}

.hero-container h1 {
  position: relative;
  z-index: 2;
  color: white;
  font-size: 3.5rem;
  margin-bottom: 20px;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-container p {
  position: relative;
  z-index: 2;
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.3rem;
  margin-bottom: 30px;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

.hero-container .cta {
  position: relative;
  z-index: 2;
  background-color: var(--accent-color);
  color: white;
  padding: 18px 36px;
  font-size: 1.1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  box-shadow: 0 4px 15px rgba(255, 107, 53, 0.4);
  transition: all var(--transition-speed);
}

.hero-container .cta:hover {
  background-color: #e55a2b;
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(255, 107, 53, 0.6);
}

/* Burger Menu */
.burger-menu {
  display: none;
  cursor: pointer;
  background: none;
  border: none;
  padding: 10px;
}

.burger-menu span {
  display: block;
  width: 25px;
  height: 3px;
  margin: 5px 0;
  background-color: #ffffff;
  transition: var(--transition-speed);
}

/* Dark Mode Services and Contact */
.dark-mode #services li,
.dark-mode #technologies li,
.dark-mode #contact form,
.dark-mode .testimonial-card {
  background-color: var(--dark-background);
  color: var(--dark-text);
  border-color: var(--primary-color);
}

.dark-mode .stat-item {
  background: linear-gradient(135deg, var(--dark-background), var(--primary-color));
  border: 1px solid var(--primary-color);
}

.dark-mode #services li h3,
.dark-mode #technologies li h3 {
  color: var(--secondary-color);
}

.dark-mode #contact form label {
  color: var(--dark-text);
}

.dark-mode #contact form input,
.dark-mode #contact form textarea {
  background-color: var(--dark-background);
  color: var(--dark-text);
  border-color: var(--primary-color);
}

.dark-mode #contact form input::placeholder,
.dark-mode #contact form textarea::placeholder {
  color: var(--dark-text);
  opacity: 0.7;
}

/* Responsive Navigation */
@media (max-width: 768px) {
  .burger-menu {
    display: block;
  }

  nav ul {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--primary-color);
    padding: 20px;
  }

  nav ul.active {
    display: flex;
  }

  header .container {
    position: relative;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }

  #dark-mode-toggle {
    margin-left: 20px;
  }
}

/* Responsive Adjustments */
@media (max-width: 768px) {
  header .container {
    flex-direction: column;
    align-items: flex-start;
  }

  nav ul {
    flex-direction: column;
    gap: 10px;
    margin-top: 10px;
  }

  #hero h1 {
    font-size: 2.5rem;
  }

  #hero p {
    font-size: 1rem;
  }

  #services ul,
  #technologies ul {
    grid-template-columns: 1fr;
  }

  #services li,
  #technologies li {
    max-width: 400px;
  }
}

/* Accessibility Enhancements */
a:focus,
button:focus {
  outline: 2px dashed var(--secondary-color);
  outline-offset: 4px;
}

/* Utility Classes (Optional for Reusability) */
.text-center {
  text-align: center;
}

.mt-1 {
  margin-top: 1rem;
}

.mb-1 {
  margin-bottom: 1rem;
}

/* Dark Mode Toggle Button Accessibility */
#dark-mode-toggle[aria-pressed="true"]::after {
  content: ' ☀️';
}

#dark-mode-toggle[aria-pressed="false"]::after {
  content: ' 🌙';
}