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

:root {
  --color-primary-dark: #1a1a1a;
  --color-primary-text: #2d2d2d;
  --color-text-light: #5a5a5a;
  --color-bg: #ffffff;
  --color-bg-alt: #f9f9f9;
  --color-border: #e6e6e6;
  --color-accent: #0056b3;
  --color-accent-hover: #004494;
  --max-width: 1100px;
  --spacing-section: 80px;
  --transition: 0.3s ease;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-primary-text);
  background-color: var(--color-bg);
  font-weight: 400;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-primary-dark);
}

h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
}

h2 {
  font-size: 2.25rem;
  margin-bottom: 3rem;
  text-align: center;
}

h3 {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

h4 {
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

p {
  margin-bottom: 1rem;
}

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

a:hover {
  color: var(--color-accent-hover);
}

/* Layout */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

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

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

/* Header */
.header {
  position: sticky;
  top: 0;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
  backdrop-filter: blur(10px);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 0;
}

.logo {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-primary-dark);
  letter-spacing: -0.02em;
}

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

.nav {
  display: flex;
  gap: 2rem;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-primary-text);
  transition: color var(--transition);
}

.nav-link:hover {
  color: var(--color-accent);
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.mobile-menu-toggle span {
  width: 24px;
  height: 2px;
  background-color: var(--color-primary-dark);
  transition: transform var(--transition), opacity var(--transition);
}

.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background-color: var(--color-bg);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
}

.mobile-menu.active {
  opacity: 1;
  visibility: visible;
}

.mobile-nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
}

.mobile-nav-link {
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--color-primary-text);
}

/* Hero Section */
.hero {
  padding: 120px 0 100px;
  text-align: center;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-text-light);
  max-width: 700px;
  margin: 0 auto 2.5rem;
  line-height: 1.7;
}

/* Components */
.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  font-size: 1rem;
  font-weight: 500;
  text-align: center;
  border-radius: 4px;
  cursor: pointer;
  border: none;
  transition: background-color var(--transition), transform var(--transition);
}

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

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  color: var(--color-bg);
  transform: translateY(-2px);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.card {
  padding: 2rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background-color: var(--color-bg);
  transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.card-tech {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 1.5rem 1rem;
  min-height: 140px;
  background-color: var(--color-bg-alt);
}

.card-tech h3 {
  margin-top: 0.25rem;
  margin-bottom: 0;
  font-size: 1.25rem;
}

.icon {
  color: var(--color-accent);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
}

.icon svg {
  display: block;
  width: 100%;
  height: 100%;
}

/* Services Section */
#services .card p {
  color: var(--color-text-light);
  font-size: 0.9375rem;
  line-height: 1.7;
}


/* Clients Section */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  max-width: 900px;
  margin: 0 auto;
}

.client-badge {
  padding: 2rem 1.5rem;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  text-align: center;
  font-weight: 500;
  color: var(--color-text-light);
  transition: all var(--transition);
  filter: grayscale(100%);
}

.client-badge:hover {
  filter: grayscale(0%);
  color: var(--color-primary-text);
  border-color: var(--color-accent);
}

/* Contact Section */
.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  max-width: 1000px;
  margin: 0 auto;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.contact-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.contact-item .icon {
  margin-bottom: 0;
  flex-shrink: 0;
}

.contact-item h4 {
  margin-bottom: 0.25rem;
}

.contact-item p {
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* Contact Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-weight: 500;
  color: var(--color-primary-dark);
  font-size: 0.9375rem;
}

.form-group input,
.form-group textarea {
  padding: 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-family: inherit;
  font-size: 1rem;
  color: var(--color-primary-text);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(0, 86, 179, 0.1);
}

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

.form-feedback {
  padding: 1rem;
  border-radius: 4px;
  font-size: 0.9375rem;
  text-align: center;
  display: none;
}

.form-feedback.success {
  display: block;
  background-color: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}

.form-feedback.error {
  display: block;
  background-color: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
}

/* Footer */
.footer {
  background-color: var(--color-primary-dark);
  color: #ffffff;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer .container {
  padding-top: 3rem;
  padding-bottom: 3rem;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 4rem;
  margin-bottom: 2rem;
}

.footer-column h3 {
  color: #ffffff;
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.footer-column h4 {
  color: #ffffff;
  font-size: 1rem;
  margin-bottom: 1rem;
}

.footer-column p {
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.7;
  font-size: 0.9375rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9375rem;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
}

.footer-bottom p {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.875rem;
  margin-bottom: 0;
}

/* Utility Classes */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Focus Styles */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Responsive Design */
@media (max-width: 768px) {
  :root {
    --spacing-section: 60px;
  }

  h1 {
    font-size: 2.25rem;
  }

  h2 {
    font-size: 1.875rem;
  }

  .container {
    padding: 0 1.5rem;
  }

  .nav {
    display: none;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .hero {
    padding: 80px 0 60px;
  }

  .hero-subtitle {
    font-size: 1.125rem;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  #technologies .grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }

  .contact-wrapper {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.875rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .container {
    padding: 0 1rem;
  }

  .hero {
    padding: 60px 0 50px;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .card {
    padding: 1.5rem;
  }

  .btn {
    padding: 0.75rem 1.5rem;
    font-size: 0.9375rem;
  }
}

/* Accessibility - Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}