/* ======= RESET & BASE STYLES ======= */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  :root {
    /* Light Mode Colors */
    --primary-light: #e0e0e9;
    --primary-light-hover: #e7e7ef;
    --secondary-light: #8b5cf6;
    --text-light: #1f2937;
    --text-light-secondary: #4b5563;
    --bg-light: #ffffff;
    --bg-light-alt: #f5f5f5;
    --card-light: #ffffff;
    --border-light: #e5e7eb;
    
    /* Dark Mode Colors */
    --primary-dark: #6366f1;
    --primary-dark-hover: #e4e5ed;
    /* --secondary-dark: #f7f6fa; */
    /* --text-dark: #f3f4f6; */
    /* --text-dark-secondary: #d1d5db; */
    /* --bg-dark: #111827; */
    /* --bg-dark-alt: #ddecee; */
    --card-dark: #dae1ece2;
    --border-dark: #374151;
    
    /* Default Theme (Dark) */
    --primary: var(--primary-dark);
    --primary-hover: var(--primary-dark-hover);
    --secondary: var(--secondary-dark);
    --text: var(--text-dark);
    --text-secondary: var(--text-dark-secondary);
    --bg: var(--bg-dark);
    --bg-alt: var(--bg-dark-alt);
    --card: var(--card-dark);
    --border: var(--border-dark);
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1), 0 1px 3px rgba(0,0,0,0.08);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
    
    /* Transitions */
    --transition-fast: 0.3s ease;
    --transition-normal: 0.5s ease;
    --transition-slow: 0.8s ease;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-heading: 'Poppins', -apple-system, BlinkMacSystemFont, sans-serif;
  }
  
  html {
    font-size: 16px;
    scroll-behavior: smooth;
  }
  
  body {
    font-family: var(--font-primary);
    font-weight: 400;
    line-height: 1.6;
    color: var(--text);
    background-color: var(--bg);
    overflow-x: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
  }
  
  /* Light Mode */
  body.light-mode {
    --primary: var(--primary-light);
    --primary-hover: var(--primary-light-hover);
    --secondary: var(--secondary-light);
    --text: var(--text-light);
    --text-secondary: var(--text-light-secondary);
    --bg: var(--bg-light);
    --bg-alt: var(--bg-light-alt);
    --card: var(--card-light);
    --border: var(--border-light);
  }
  
  h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    line-height: 1.3;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 1rem;
  }
  
  h1 {
    font-size: 3.5rem;
  }
  
  h2 {
    font-size: 2.5rem;
  }
  
  h3 {
    font-size: 1.75rem;
  }
  
  h4 {
    font-size: 1.25rem;
  }
  
  p {
    margin-bottom: 1.5rem;
  }
  
  a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-fast);
  }
  
  a:hover {
    color: var(--primary-hover);
  }
  
  section {
    padding: 6rem 0;
  }
  
  .container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
  }
  
  img {
    max-width: 100%;
    height: auto;
  }
  
  /* ======= PRELOADER ======= */
  .preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.6s, visibility 0.6s;
  }
  
  .loader {
    width: 60px;
    height: 60px;
    border: 5px solid rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    border-top: 5px solid var(--primary);
    animation: spin 1s linear infinite;
  }
  
  @keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }
  
  .preloader.fade-out {
    opacity: 0;
    visibility: hidden;
  }
  
  /* ======= THEME TOGGLE ======= */
  .theme-toggle {
    position: fixed;
    bottom: 2rem;
    left: 2rem;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--card);
    box-shadow: var(--shadow-md);
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    z-index: 100;
    transition: transform var(--transition-fast);
  }
  
  .theme-toggle:hover {
    transform: scale(1.1);
  }
  
  .theme-toggle i {
    font-size: 1.5rem;
    color: var(--primary);
    position: absolute;
    transition: opacity 0.3s, transform 0.5s;
  }
  
  .theme-toggle .fa-sun {
    opacity: 0;
    transform: scale(0.5);
  }
  
  .theme-toggle .fa-moon {
    opacity: 1;
    transform: scale(1);
  }
  
  body.light-mode .theme-toggle .fa-sun {
    opacity: 1;
    transform: scale(1);
  }
  
  body.light-mode .theme-toggle .fa-moon {
    opacity: 0;
    transform: scale(0.5);
  }
  
  /* ======= NAVIGATION ======= */
  .navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1.5rem 0;
    z-index: 1000;
    transition: all var(--transition-normal);
  }
  
  .navbar.scrolled {
    background-color: var(--bg);
    box-shadow: var(--shadow-md);
    padding: 1rem 0;
  }
  
  .navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .logo {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text);
  }
  
  .logo span {
    color: var(--primary);
  }
  
  .nav-links {
    display: flex;
    list-style: none;
  }
  
  .nav-links li {
    margin-left: 2.5rem;
  }
  
  .nav-links a {
    color: var(--text);
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
  }
  
  .nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    transition: width var(--transition-fast);
  }
  
  .nav-links a:hover::after,
  .nav-links a.active::after {
    width: 100%;
  }
  
  .hamburger {
    display: none;
    cursor: pointer;
  }
  
  .bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    background-color: var(--text);
    transition: all var(--transition-fast);
  }
  
  /* ======= BUTTONS ======= */
  .btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    outline: none;
  }
  
  .btn.primary {
    background-color: var(--primary);
    color: white;
    box-shadow: var(--shadow-md);
  }
  
  .btn.primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
  }
  
  .btn.secondary {
    background-color: transparent;
    color: var(--text);
    border: 2px solid var(--primary);
  }
  
  .btn.secondary:hover {
    background-color: var(--primary);
    color: white;
    transform: translateY(-3px);
  }
   
  /* ======= CONTACT SECTION ======= */
  .contact {
    background-color: var(--bg-alt);
  }
  
  .contact-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
  }
  
  .contact-info {
    padding-right: 2rem;
  }
  
  .contact-info h3 {
    margin-bottom: 1.5rem;
    position: relative;
    display: inline-block;
  }
  
  .contact-info h3::after {
    content: '';
    position: absolute;
    width: 50%;
    height: 3px;
    background: linear-gradient(to right, var(--primary), transparent);
    bottom: -8px;
    left: 0;
  }
  
  .contact-info .info-item {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
  }
  
  .contact-info .info-item i {
    width: 50px;
    height: 50px;
    background-color: var(--primary);
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 50%;
    font-size: 1.2rem;
  }
  
  .contact-info .info-item h4 {
    margin-bottom: 0.25rem;
  }
  
  .contact-info .info-item p {
    color: var(--text-secondary);
    margin-bottom: 0;
  }
  
  .social-links {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
  }
  
  .social-icon {
    width: 45px;
    height: 45px;
    background-color: var(--bg);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--text);
    font-size: 1.2rem;
    transition: all var(--transition-fast);
  }
  
  .social-icon:hover {
    background-color: var(--primary);
    color: white;
    transform: translateY(-5px);
  }
  
  .copyable {
    cursor: pointer;
    position: relative;
  }
  
  .copyable:hover::after {
    content: 'Click to copy';
    position: absolute;
    bottom: 100%;
    left: 0;
    background-color: var(--bg);
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    font-size: 0.8rem;
    box-shadow: var(--shadow-sm);
    opacity: 0.9;
  }
  
  .contact-form {
    background-color: var(--card);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
  }
  
  .form-group {
    position: relative;
    margin-bottom: 2rem;
  }
  
  .form-control {
    width: 100%;
    padding: 0.75rem 0;
    font-size: 1rem;
    border: none;
    border-bottom: 1px solid var(--border);
    background-color: transparent;
    color: var(--text);
    outline: none;
    transition: border-color var(--transition-fast);
  }
  
  .form-control:focus {
    border-color: var(--primary);
  }
  
  .form-group label {
    position: absolute;
    top: 0.75rem;
    left: 0;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    pointer-events: none;
  }
  
  .form-control:focus ~ label,
  .form-control:valid ~ label {
    top: -1.2rem;
    font-size: 0.85rem;
    color: var(--primary);
  }
  
  .form-line {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary);
    transition: width var(--transition-fast);
  }
  
  .form-control:focus ~ .form-line {
    width: 100%;
  }
  
  textarea.form-control {
    min-height: 100px;
    resize: vertical;
  }