* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      background: #2c3e50;
      color: #ecf0f1;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

    /* Header Styles */
    .header {
      background: #34495e;
      padding: 12px 32px;
      display: flex;
      align-items: center;
      gap: 24px;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
      position: sticky;
      top: 0;
      z-index: 100;
      justify-content: space-between;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
      color: white;
      font-size: 20px;
      font-weight: 600;
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, #ff6b6b, #ff8787);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
    }

    .search-container {
      position: absolute;
      left: 50%;
      transform: translateX(-50%);
      width: 100%;
      max-width: 500px;
    }

    .search-container input {
      width: 100%;
      padding: 10px 16px;
      background: #2c3e50;
      border: 1px solid #445566;
      border-radius: 8px;
      color: #ecf0f1;
      font-size: 14px;
    }

    .header-icons {
      display: flex;
      align-items: center;
      gap: 20px;
      margin-left: auto;
    }

    .icon-btn {
      background: none;
      border: none;
      color: #ecf0f1;
      font-size: 22px;
      cursor: pointer;
      padding: 8px;
      transition: all 0.3s ease;
      position: relative;
    }

    .icon-btn:hover {
      color: #ff6b6b;
    }

    .notification-badge {
      position: absolute;
      top: 4px;
      right: 4px;
      background: #ff6b6b;
      color: white;
      font-size: 10px;
      font-weight: bold;
      width: 18px;
      height: 18px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .sell-btn {
      background: linear-gradient(135deg, #ff6b6b, #ff5252);
      color: white;
      border: none;
      padding: 10px 24px;
      border-radius: 8px;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.3s ease;
      font-size: 14px;
    }

    .sell-btn:hover {
      background: linear-gradient(135deg, #ff5252, #ff3838);
      transform: translateY(-2px);
    }

    .menu-toggle {
      font-size: 24px;
      cursor: pointer;
      color: white;
      padding: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: all 0.3s ease;
      background: rgba(255, 107, 107, 0.1);
      border-radius: 8px;
      min-width: 40px;
      min-height: 40px;
    }

    .menu-toggle:hover {
      background: rgba(255, 107, 107, 0.2);
      transform: scale(1.05);
    }

    /* Side Menu */
    .side-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 280px;
      height: 100vh;
      background: #34495e;
      z-index: 200;
      padding: 24px;
      transform: translateX(-100%);
      transition: transform 0.3s ease;
      box-shadow: 4px 0 12px rgba(0, 0, 0, 0.3);
      overflow-y: auto;
      display: flex;
      flex-direction: column;
    }

    .side-menu.active {
      transform: translateX(0);
    }

    .menu-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 32px;
    }

    .menu-close {
      background: none;
      border: none;
      color: white;
      font-size: 24px;
      cursor: pointer;
      padding: 4px;
    }

    .menu-main-content {
      flex-grow: 1;
    }

    .menu-main-content a,
    .menu-bottom-section a {
      display: block;
      padding: 14px 16px;
      color: #bdc3c7;
      text-decoration: none;
      border-radius: 8px;
      margin-bottom: 8px;
      transition: all 0.3s ease;
      font-size: 15px;
    }

    .menu-main-content a:hover,
    .menu-bottom-section a:hover {
      background: #3d566e;
      color: #ff6b6b;
      transform: translateX(4px);
    }

    .menu-bottom-section {
      margin-top: auto;
      padding-top: 24px;
      border-top: 1px solid #445566;
    }

    /* Register Container */
    .register-container {
      display: flex;
      justify-content: center;
      align-items: center;
      flex-grow: 1;
      padding: 40px 20px;
    }

    .register-wrapper {
      width: 100%;
      max-width: 440px;
    }

    .register-form {
      background: #34495e;
      border-radius: 16px;
      padding: 48px 40px;
      box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
      border: 1px solid #445566;
      position: relative;
      overflow: hidden;
    }

    .register-form::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 3px;
      background: linear-gradient(90deg, #ff6b6b, #ffa07a, #ffb088);
    }

    .form-header {
      text-align: center;
      margin-bottom: 36px;
    }

    .form-title {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 8px;
      color: #ecf0f1;
    }

    .form-subtitle {
      color: #95a5a6;
      font-size: 15px;
    }

    #messageContainer {
      margin-bottom: 20px;
    }

    .message {
      padding: 14px 18px;
      border-radius: 10px;
      margin-bottom: 16px;
      font-weight: 500;
      font-size: 14px;
      text-align: center;
      opacity: 0;
      transform: translateY(-10px);
      transition: all 0.3s ease;
    }

    .message.show {
      opacity: 1;
      transform: translateY(0);
    }

    .message.error {
      background: linear-gradient(135deg, #ef4444, #dc2626);
      color: white;
    }

    .message.success {
      background: linear-gradient(135deg, #10b981, #059669);
      color: white;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 18px;
      margin-bottom: 28px;
    }

    .input-wrapper {
      position: relative;
    }

    .input-icon {
      position: absolute;
      left: 16px;
      top: 50%;
      transform: translateY(-50%);
      color: #95a5a6;
      font-size: 18px;
      pointer-events: none;
    }

    .form-input {
      width: 100%;
      padding: 14px 16px 14px 48px;
      background: #2c3e50;
      border: 1px solid #445566;
      border-radius: 10px;
      color: #ecf0f1;
      font-size: 15px;
      transition: all 0.3s ease;
    }

    .form-input::placeholder {
      color: #7f8c8d;
    }

    .form-input:focus {
      outline: none;
      border-color: #ff6b6b;
      box-shadow: 0 0 0 3px rgba(255, 107, 107, 0.1);
      background: #34495e;
    }

    .password-strength {
      margin-top: 6px;
      font-size: 12px;
      font-weight: 500;
      transition: all 0.3s ease;
    }

    .strength-weak { color: #ef4444; }
    .strength-medium { color: #f59e0b; }
    .strength-strong { color: #10b981; }

    .submit-button {
      width: 100%;
      padding: 16px;
      background: linear-gradient(135deg, #10b981, #059669);
      color: white;
      border: none;
      border-radius: 10px;
      font-size: 16px;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.3s ease;
    }

    .submit-button:hover {
      background: linear-gradient(135deg, #059669, #047857);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
    }

    .submit-button:active {
      transform: translateY(0);
    }

    .submit-button:disabled {
      opacity: 0.6;
      cursor: not-allowed;
      transform: none;
    }

    .form-footer {
      text-align: center;
      margin-top: 24px;
      color: #95a5a6;
      font-size: 14px;
    }

    .form-footer a {
      color: #ff8787;
      text-decoration: none;
      font-weight: 500;
      transition: color 0.3s ease;
    }

    .form-footer a:hover {
      color: #ffa07a;
    }

    /* Footer */
    .footer {
      background: #34495e;
      padding: 40px 32px 20px;
      margin-top: auto;
      border-top: 1px solid #445566;
    }

    .footer-content {
      max-width: 1400px;
      margin: 0 auto;
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 32px;
      margin-bottom: 24px;
    }

    .footer-section h3 {
      color: #ff6b6b;
      font-size: 16px;
      margin-bottom: 12px;
      font-weight: 600;
    }

    .footer-section p,
    .footer-section a {
      color: #95a5a6;
      font-size: 14px;
      line-height: 1.8;
      text-decoration: none;
    }

    .footer-section a:hover {
      color: #ff6b6b;
    }

    .footer-section ul {
      list-style: none;
    }

    .footer-section ul li {
      margin-bottom: 8px;
    }

    .footer-bottom {
      text-align: center;
      padding-top: 20px;
      border-top: 1px solid #445566;
      color: #7f8c8d;
      font-size: 13px;
    }

    /* Animations */
    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(30px); }
      to { opacity: 1; transform: translateY(0); }
    }

    .animate-fadeIn {
      animation: fadeIn 0.6s ease-out;
    }

    /* Responsive */
    @media (max-width: 768px) {
      .search-container {
        display: none;
      }

      .header {
        padding: 12px 16px;
      }

      .register-form {
        padding: 36px 28px;
      }

      .form-title {
        font-size: 28px;
      }

      .footer-content {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 480px) {
      .register-form {
        padding: 32px 24px;
      }

      .form-title {
        font-size: 26px;
      }

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