/* CSS Variables */
:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --bg-quaternary: #30363d;
    --text-primary: #f0f6fc;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --accent: #007acc;
    --accent-hover: #1177bb;
    --success: #238636;
    --warning: #d29922;
    --error: #da3633;
    --border: #30363d;
    --shadow: rgba(0, 0, 0, 0.45);
    --gradient-primary: linear-gradient(135deg, #007acc 0%, #238636 100%);
    --gradient-hero: linear-gradient(135deg, rgba(0, 122, 204, 0.1) 0%, rgba(35, 134, 54, 0.1) 100%);
  }
  
  /* Reset and Base Styles */
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
  }
  
  /* Header Styles */
  .header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(13, 17, 23, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    transition: all 0.3s ease;
  }
  
  .nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
  }
  
  .logo-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
  }
  
  .nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
  }
  
  .nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
    font-weight: 500;
  }
  
  .nav-links a:hover {
    color: var(--accent);
  }
  
  .cta-header {
    background: var(--accent);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
  }
  
  .cta-header:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 122, 204, 0.3);
  }
  
  /* Hero Section */
  .hero {
    padding: 120px 2rem 80px;
    background: var(--gradient-hero);
    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="%23007acc" stroke-width="0.5" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.5;
  }
  
  .hero-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 1;
  }
  
  .hero-text h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
  }
  
  .hero-text p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.6;
  }
  
  .hero-stats {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
  }
  
  .stat {
    text-align: center;
  }
  
  .stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent);
    display: block;
  }
  
  .stat-label {
    font-size: 0.9rem;
    color: var(--text-muted);
  }
  
  .hero-cta {
    display: flex;
    gap: 1rem;
    align-items: center;
  }
  
  .btn {
    padding: 1rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    border: none;
    cursor: pointer;
    font-size: 1rem;
  }
  
  .btn-primary {
    background: var(--accent);
    color: white;
  }
  
  .btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 122, 204, 0.3);
  }
  
  .btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border);
  }
  
  .btn-secondary:hover {
    border-color: var(--accent);
    color: var(--accent);
  }
  
  .hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
  }
  
  .phone-mockup {
    width: 300px;
    height: 600px;
    background: var(--bg-secondary);
    border-radius: 30px;
    border: 8px solid var(--bg-quaternary);
    position: relative;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    transform: rotate(-5deg);
    transition: transform 0.3s ease;
  }
  
  .phone-mockup:hover {
    transform: rotate(0deg) scale(1.05);
  }
  
  .phone-screen {
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, var(--accent), var(--success));
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 1rem;
    padding: 2rem;
  }
  
  .app-icon {
    width: 80px;
    height: 80px;
    background: white;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--accent);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  }
  
  .floating-elements {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120%;
    height: 120%;
    pointer-events: none;
  }
  
  .floating-icon {
    position: absolute;
    width: 60px;
    height: 60px;
    background: var(--bg-secondary);
    border: 2px solid var(--border);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    font-size: 1.5rem;
    animation: float 6s ease-in-out infinite;
  }
  
  .floating-icon:nth-child(1) { top: 10%; left: 10%; animation-delay: 0s; }
  .floating-icon:nth-child(2) { top: 20%; right: 10%; animation-delay: 2s; }
  .floating-icon:nth-child(3) { bottom: 20%; left: 15%; animation-delay: 4s; }
  .floating-icon:nth-child(4) { bottom: 10%; right: 15%; animation-delay: 6s; }
  
  @keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(5deg); }
  }
  
  /* Container */
  .container {
    max-width: 1200px;
    margin: 0 auto;
  }
  
  /* Section Styles */
  .services {
    padding: 80px 2rem;
    background: var(--bg-secondary);
  }
  
  .technologies {
    padding: 80px 2rem;
    background: var(--bg-primary);
  }
  
  .portfolio {
    padding: 80px 2rem;
    background: var(--bg-secondary);
  }
  
  .calculator {
    padding: 80px 2rem;
    background: var(--bg-primary);
  }
  
  .contact {
    padding: 80px 2rem;
    background: var(--bg-secondary);
  }
  
  .section-header {
    text-align: center;
    margin-bottom: 4rem;
  }
  
  .section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
  }
  
  .section-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
  }
  
  /* Services Grid */
  .services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
  }
  
  .service-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
  }
  
  .service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
  }
  
  .service-card:hover::before {
    transform: scaleX(1);
  }
  
  .service-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent);
    box-shadow: 0 10px 40px rgba(0, 122, 204, 0.1);
  }
  
  .service-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
  }
  
  .service-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
  }
  
  .service-description {
    color: var(--text-secondary);
    line-height: 1.6;
  }
  
  /* Technologies Grid */
  .tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
  }
  
  .tech-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
  }
  
  .tech-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent);
    box-shadow: 0 10px 40px rgba(0, 122, 204, 0.1);
  }
  
  .tech-logo {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: var(--bg-tertiary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--accent);
  }
  
  .tech-name {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
  }
  
  .tech-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
  }
  
  /* Portfolio Styles */
  .portfolio-showcase {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    margin-top: 3rem;
  }
  
  .portfolio-info {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
  }
  
  .app-title {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
  }
  
  .app-description {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.6;
  }
  
  .app-features {
    list-style: none;
    margin-bottom: 2rem;
  }
  
  .app-features li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }
  
  .app-features li::before {
    content: '✓';
    color: var(--success);
    font-weight: bold;
  }
  
  .app-links {
    display: flex;
    gap: 1rem;
  }
  
  .store-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-quaternary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s ease;
  }
  
  .store-badge:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
  }
  
  .portfolio-visual {
    display: flex;
    justify-content: center;
  }
  
  .app-screenshot {
    max-width: 300px;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease;
  }
  
  .app-screenshot:hover {
    transform: scale(1.05);
  }
  
  /* Calculator Styles */
  .calculator-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 3rem;
    margin-top: 3rem;
  }
  
  .calculator-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
  
  .form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .form-label {
    font-weight: 600;
    color: var(--text-primary);
  }
  
  .form-select, .form-input {
    background: var(--bg-tertiary);
    border: 2px solid var(--border);
    border-radius: 6px;
    padding: 0.75rem;
    color: var(--text-primary);
    font-size: 1rem;
  }
  
  .form-select:focus, .form-input:focus {
    outline: none;
    border-color: var(--accent);
  }
  
  .checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .checkbox-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }
  
  .checkbox-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--accent);
  }
  
  .price-result {
    grid-column: 1 / -1;
    background: var(--bg-tertiary);
    border: 2px solid var(--accent);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    margin-top: 2rem;
  }
  
  .price-estimate {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 0.5rem;
  }
  
  .price-note {
    color: var(--text-secondary);
    font-size: 0.9rem;
  }
  
  /* Contact Styles */
  .contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    margin-top: 3rem;
  }
  
  .contact-info {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
  }
  
  .contact-methods {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }
  
  .contact-method {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-quaternary);
    border-radius: 8px;
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s ease;
  }
  
  .contact-method:hover {
    background: var(--accent);
    transform: translateX(5px);
  }
  
  .contact-icon {
    width: 40px;
    height: 40px;
    background: var(--accent);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
  }
  
  .contact-details h4 {
    margin-bottom: 0.25rem;
    font-size: 1.1rem;
  }
  
  .contact-details p {
    color: var(--text-secondary);
    font-size: 0.9rem;
  }
  
  .project-form {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
  }
  
  .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
  }
  
  .form-textarea {
    background: var(--bg-quaternary);
    border: 2px solid var(--border);
    border-radius: 6px;
    padding: 0.75rem;
    color: var(--text-primary);
    font-size: 1rem;
    resize: vertical;
    min-height: 120px;
    font-family: inherit;
  }
  
  .form-textarea:focus {
    outline: none;
    border-color: var(--accent);
  }
  
  /* Footer */
  .footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border);
    padding: 3rem 2rem 2rem;
    text-align: center;
  }
  
  .footer-content {
    max-width: 1200px;
    margin: 0 auto;
  }
  
  .footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
  }
  
  .footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
  }
  
  .footer-links a:hover {
    color: var(--accent);
  }
  
  .footer-text {
    color: var(--text-muted);
    font-size: 0.9rem;
  }
  
  /* Mobile Menu */
  .mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
  }
  
  .mobile-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 2rem;
  }
  
  .mobile-menu.active {
    display: block;
  }
  
  .mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    list-style: none;
    margin-bottom: 2rem;
  }
  
  /* Responsive Design */
  @media (max-width: 968px) {
    .nav-links {
      display: none;
    }
  
    .mobile-menu-toggle {
      display: block;
    }
  
    .hero-content {
      grid-template-columns: 1fr;
      gap: 2rem;
      text-align: center;
    }
  
    .hero-text h1 {
      font-size: 2.5rem;
    }
  
    .hero-stats {
      justify-content: center;
    }
  
    .calculator-form {
      grid-template-columns: 1fr;
    }
  
    .contact-container {
      grid-template-columns: 1fr;
    }
  
    .portfolio-showcase {
      grid-template-columns: 1fr;
    }
  
    .form-row {
      grid-template-columns: 1fr;
    }
  
    .floating-elements {
      display: none;
    }
  }
  
  @media (max-width: 640px) {
    .hero {
      padding: 100px 1rem 60px;
    }
  
    .services, .technologies, .portfolio, .calculator, .contact {
      padding: 60px 1rem;
    }
  
    .nav {
      padding: 1rem;
    }
  
    .hero-cta {
      flex-direction: column;
      align-items: stretch;
    }
  
    .btn {
      text-align: center;
      justify-content: center;
    }
  
    .footer-links {
      flex-direction: column;
      gap: 1rem;
    }
  
    .hero-stats {
      flex-direction: column;
      gap: 1rem;
    }
  
    .section-title {
      font-size: 2rem;
    }
  
    .calculator-container {
      padding: 2rem 1rem;
    }
  
    .price-estimate {
      font-size: 2rem;
    }
  }