:root {
      --primary: #e74c3c;
      --primary-dark: #c0392b;
      --secondary: #3498db;
      --light: #f5f5f5;
      --dark: #333;
      --gray: #7f8c8d;
      --success: #2ecc71;
      --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    }

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

    body {
      font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
      background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
      min-height: 100vh;
      display: flex;
      justify-content: center;
      align-items: center;
      padding: 20px;
      color: var(--dark);
      line-height: 1.6;
    }

    .container {
      background: white;
      width: 100%;
      max-width: 800px;
      border-radius: 12px;
      box-shadow: var(--shadow);
      overflow: hidden;
    }

    .header {
      background: var(--primary);
      color: white;
      padding: 30px 20px;
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .header::before {
      content: "";
      position: absolute;
      top: -50px;
      right: -50px;
      width: 200px;
      height: 200px;
      background: rgba(255, 255, 255, 0.1);
      border-radius: 50%;
    }

    .header::after {
      content: "";
      position: absolute;
      bottom: -80px;
      left: -30px;
      width: 150px;
      height: 150px;
      background: rgba(255, 255, 255, 0.1);
      border-radius: 50%;
    }

    .logo {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 15px;
      margin-bottom: 20px;
    }

    .logo-icon {
      background: white;
      width: 60px;
      height: 60px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    }

    .logo-icon i {
      font-size: 28px;
      color: var(--primary);
    }

    .logo-text {
      font-size: 24px;
      font-weight: bold;
      letter-spacing: 1px;
    }

    h1 {
      font-size: 28px;
      margin-bottom: 10px;
      position: relative;
      z-index: 2;
    }

    .subtitle {
      font-size: 16px;
      opacity: 0.9;
      max-width: 500px;
      margin: 0 auto;
      position: relative;
      z-index: 2;
    }

    .content {
      padding: 30px;
    }

    .form-group {
      margin-bottom: 25px;
      flex: 1;
    }

    label {
      display: block;
      margin-bottom: 8px;
      font-weight: bold;
      color: var(--dark);
      font-size: 16px;
    }

    input {
      width: 100%;
      padding: 14px 16px;
      border: 1px solid #ddd;
      border-radius: 8px;
      font-size: 16px;
      transition: all 0.3s;
    }

    input:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.2);
      outline: none;
    }

    .btn {
      display: block;
      width: 100%;
      padding: 16px;
      font-size: 18px;
      font-weight: bold;
      text-align: center;
      border: none;
      border-radius: 8px;
      cursor: pointer;
      transition: all 0.3s;
      margin-top: 10px;
    }

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

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 6px 15px rgba(231, 76, 60, 0.3);
    }

    .btn-secondary {
      background: var(--secondary);
      color: white;
    }

    .btn-secondary:hover {
      background: #2980b9;
      transform: translateY(-2px);
      box-shadow: 0 6px 15px rgba(52, 152, 219, 0.3);
    }

    .notice {
      background-color: #f8f9fa;
      border-left: 4px solid var(--primary);
      padding: 20px;
      border-radius: 0 8px 8px 0;
      margin-top: 30px;
    }

    .notice h3 {
      color: var(--primary);
      margin-bottom: 15px;
      font-size: 20px;
    }

    .notice ol {
      padding-left: 20px;
    }

    .notice li {
      margin-bottom: 10px;
    }

    /* 弹窗样式 */
    .modal {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0, 0, 0, 0.7);
      display: flex;
      justify-content: center;
      align-items: center;
      z-index: 1000;
      opacity: 0;
      visibility: hidden;
      transition: all 0.3s;
    }

    .modal.active {
      opacity: 1;
      visibility: visible;
    }

    .modal-content {
      background: white;
      width: 90%;
      max-width: 500px;
      border-radius: 12px;
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
      transform: translateY(-50px);
      transition: transform 0.4s;
      overflow: hidden;
    }

    .modal.active .modal-content {
      transform: translateY(0);
    }

    .modal-header {
      background: var(--primary);
      color: white;
      padding: 20px;
      position: relative;
    }

    .modal-header h2 {
      font-size: 24px;
    }

    .close-modal {
      position: absolute;
      top: 20px;
      right: 20px;
      background: none;
      border: none;
      font-size: 24px;
      color: white;
      cursor: pointer;
      transition: all 0.3s;
    }

    .close-modal:hover {
      transform: rotate(90deg);
    }

    .modal-body {
      padding: 25px;
    }

    .user-info {
      margin-bottom: 25px;
    }

    .info-row {
      display: flex;
      padding: 12px 0;
      border-bottom: 1px solid #eee;
    }

    .info-label {
      width: 120px;
      font-weight: bold;
      color: var(--gray);
    }

    .info-value {
      flex: 1;
    }

    .modal-footer {
      padding: 20px;
      background: #f9f9f9;
      display: flex;
      gap: 15px;
    }

    /* 加载指示器 */
    .loader {
      display: none;
      text-align: center;
      padding: 20px;
    }

    .spinner {
      width: 50px;
      height: 50px;
      border: 5px solid rgba(231, 76, 60, 0.2);
      border-top: 5px solid var(--primary);
      border-radius: 50%;
      animation: spin 1s linear infinite;
      margin: 0 auto 20px;
    }

    @keyframes spin {
      0% {
        transform: rotate(0deg);
      }

      100% {
        transform: rotate(360deg);
      }
    }

    .success-message {
      display: none;
      background: var(--success);
      color: white;
      padding: 15px;
      border-radius: 8px;
      text-align: center;
      margin-top: 20px;
    }

    /* 响应式设计 */
    @media (max-width: 600px) {
      .header {
        padding: 20px 15px;
      }

      .content {
        padding: 20px 15px;
      }

      h1 {
        font-size: 24px;
      }

      .modal-footer {
        flex-direction: column;
      }
    }