* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: 'Segoe UI', sans-serif;
    background: linear-gradient(to bottom, #e6f0ff, #ffffff);
    padding: 40px 20px;
    color: #333;
  }
  
  .contact-section {
    max-width: 600px;
    margin: auto;
    background: #ffffff;
    border-radius: 16px;
    padding: 40px 30px;
    box-shadow: 0 8px 24px rgba(0, 188, 212, 0.2);
  }
  
  .contact-box h1 {
    color: #00bcd4;
    font-size: 2.4rem;
    margin-bottom: 10px;
    text-align: center;
  }
  
  .subtitle {
    font-size: 1rem;
    color: #666;
    margin-bottom: 30px;
    text-align: center;
  }
  
  form .form-group {
    margin-bottom: 20px;
  }
  
  form label {
    font-weight: 600;
    display: block;
    margin-bottom: 8px;
    color: #007c91;
  }
  
  form input,
  form textarea {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e0f7fa;
    border-radius: 8px;
    outline: none;
    transition: 0.3s;
    font-size: 1rem;
  }
  
  form input:focus,
  form textarea:focus {
    border-color: #00bcd4;
    box-shadow: 0 0 8px rgba(0, 188, 212, 0.2);
  }
  
  form button {
    background-color: #00bcd4;
    color: white;
    padding: 12px 20px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.3s;
    display: block;
    width: 100%;
    margin-top: 10px;
  }
  
  form button:hover {
    background-color: #0097a7;
  }
  .hamburger {
    font-size: 30px;
    padding: 10px 20px;
    background-color: #00bcd4;
    color: white;
    position: fixed;
    top: 10px;
    left: 10px;
    z-index: 1001;
    border-radius: 8px;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0,0,0,0.15);
  }
  
  .sidebar {
    position: fixed;
    top: 0;
    left: -260px;
    width: 240px;
    height: 100%;
    background-color: #00bcd4;
    color: white;
    padding: 25px 20px;
    transition: left 0.3s ease;
    z-index: 1000;
    box-shadow: 4px 0 12px rgba(0,0,0,0.2);
    border-top-right-radius: 20px;
    border-bottom-right-radius: 20px;
  }
  
  .sidebar.active {
    left: 0;
  }
  
  .sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .sidebar-links {
    list-style: none;
    margin-top: 30px;
    padding: 0;
  }
  
  .sidebar-links li {
    margin: 15px 0;
  }
  
  .sidebar-links a {
    color: white;
    text-decoration: none;
    padding: 10px 15px;
    display: block;
    border-radius: 8px;
    transition: background 0.2s, transform 0.2s;
  }
  
  .sidebar-links a:hover {
    background-color: #007c91;
    transform: translateX(5px);
  }
  .sidebar.active ~ .hamburger {
    display: none;
  }
  /* 🔄 Page Loader Styling */
.page-loader {
    position: fixed;
    top: 0; left: 0;
    width: 100vw; height: 100vh;
    background-color: #ffffff;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.4s ease, visibility 0.4s;
  }
  
  .spinner {
    width: 50px;
    height: 50px;
    border: 6px solid #00bcd4;
    border-top: 6px solid #007c91;
    border-radius: 50%;
    animation: spin 5s linear infinite;
  }
  
  @keyframes spin {
    to { transform: rotate(360deg); }
  }
  body.dark {
    background-color: #121212;
    color: #f0f0f0;
  }
  
  body.dark .sidebar {
    background-color: #1f1f1f;
  }
  
  body.dark .main-content,
  body.dark .hero,
  body.dark .about,
  body.dark .skills,
  body.dark .login-box,
  body.dark .footer {
    background-color: #1a1a1a;
    color: #f0f0f0;
  }
  
  body.dark .btn {
    background-color: #333;
    color: #00bcd4;
    border: 1px solid #00bcd4;
  }
  
  body.dark .footer-links a {
    color: #4dd0e1;
  }