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

    :root {
      --primary: #6366f1;
      --primary-light: #818cf8;
      --primary-dark: #4f46e5;
      --secondary: #f8fafc;
      --accent: #f1f5f9;
      --text: #1e293b;
      --text-light: #64748b;
      --text-muted: #94a3b8;
      --border: #e2e8f0;
      --success: #10b981;
      --warning: #f59e0b;
      --glass: rgba(255, 255, 255, 0.1);
      --shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
      --shadow-lg: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    }

    body {
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      min-height: 100vh;
      color: var(--text);
      overflow-x: hidden;
    }

    body::before {
      content: '';
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: 
        radial-gradient(circle at 20% 20%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(120, 119, 198, 0.15) 0%, transparent 50%);
      pointer-events: none;
      z-index: 0;
    }

    .container {
      position: relative;
      z-index: 1;
      max-width: 1000px;
      margin: 0 auto;
      padding: 2rem;
    }

    .header {
      text-align: center;
      margin-bottom: 3rem;
      animation: fadeInUp 0.8s ease-out;
    }

    .title {
      font-size: 3rem;
      font-weight: 700;
      background: linear-gradient(135deg, #ffffff 0%, #f1f5f9 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 0.5rem;
      text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    }

    .subtitle {
      color: rgba(255, 255, 255, 0.8);
      font-size: 1.1rem;
      font-weight: 400;
    }

    .progress-bar {
      display: flex;
      justify-content: space-between;
      margin-bottom: 3rem;
      background: var(--glass);
      backdrop-filter: blur(10px);
      padding: 1.5rem;
      border-radius: 1rem;
      border: 1px solid rgba(255, 255, 255, 0.2);
      animation: fadeInUp 0.8s ease-out 0.2s both;
    }

    .progress-step {
      display: flex;
      flex-direction: column;
      align-items: center;
      flex: 1;
      position: relative;
      cursor: pointer;
      transition: all 0.3s ease;
    }

    .progress-step:not(:last-child)::after {
      content: '';
      position: absolute;
      top: 1.5rem;
      right: -50%;
      width: 100%;
      height: 2px;
      background: rgba(255, 255, 255, 0.2);
      transform: translateY(-50%);
    }

    .progress-step.completed::after {
      background: var(--success);
    }

    .step-circle {
      width: 3rem;
      height: 3rem;
      border-radius: 50%;
      background: rgba(255, 255, 255, 0.2);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      color: white;
      transition: all 0.3s ease;
      margin-bottom: 0.5rem;
      border: 2px solid transparent;
    }

    .progress-step.completed .step-circle {
      background: var(--success);
      transform: scale(1.1);
    }

    .progress-step.active .step-circle {
      background: var(--primary);
      border-color: white;
      box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.3);
    }

    .step-label {
      font-size: 0.85rem;
      color: rgba(255, 255, 255, 0.8);
      text-align: center;
      font-weight: 500;
    }

    .progress-step.active .step-label,
    .progress-step.completed .step-label {
      color: white;
    }

    .card {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(20px);
      border-radius: 1.5rem;
      padding: 2.5rem;
      box-shadow: var(--shadow-lg);
      border: 1px solid rgba(255, 255, 255, 0.2);
      animation: fadeInUp 0.8s ease-out 0.4s both;
    }

    .step {
      display: none;
    }

    .step.active {
      display: block;
    }

    .step-title {
      font-size: 1.8rem;
      font-weight: 600;
      margin-bottom: 2rem;
      color: var(--text);
    }

    .section-title {
      font-size: 1.2rem;
      font-weight: 600;
      margin: 2rem 0 1rem 0;
      color: var(--text);
    }

    .options-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
      gap: 1rem;
      margin-bottom: 2rem;
    }

    .option-card {
      position: relative;
      background: var(--secondary);
      border: 2px solid var(--border);
      border-radius: 0.75rem;
      padding: 1rem;
      cursor: pointer;
      transition: all 0.3s ease;
      text-align: center;
      font-weight: 500;
      color: var(--text);
    }

    .option-card:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
      border-color: var(--primary-light);
    }

    .option-card.selected {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
      color: white;
      border-color: var(--primary);
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(99, 102, 241, 0.3);
    }

    .textarea-container {
      margin: 2rem 0;
    }

    .textarea {
      width: 100%;
      min-height: 120px;
      padding: 1rem;
      border: 2px solid var(--border);
      border-radius: 0.75rem;
      font-family: inherit;
      font-size: 1rem;
      resize: vertical;
      transition: all 0.3s ease;
      background: var(--secondary);
    }

    .textarea:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    }

    .button-group {
      display: flex;
      gap: 1rem;
      margin-top: 2rem;
      flex-wrap: wrap;
    }

    .btn {
      padding: 0.75rem 1.5rem;
      border: none;
      border-radius: 0.75rem;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.3s ease;
      font-size: 1rem;
      position: relative;
      overflow: hidden;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
      color: white;
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(99, 102, 241, 0.3);
    }

    .btn-secondary {
      background: var(--accent);
      color: var(--text);
      border: 2px solid var(--border);
    }

    .btn-secondary:hover {
      background: var(--border);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      color: var(--primary);
      border: 2px solid var(--primary);
    }

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

    .btn:disabled {
      opacity: 0.5;
      cursor: not-allowed;
      transform: none !important;
    }

    .output-box {
      background: linear-gradient(135deg, var(--accent) 0%, var(--secondary) 100%);
      border-left: 4px solid var(--primary);
      border-radius: 1rem;
      padding: 1.5rem;
      margin: 1.5rem 0;
      line-height: 1.7;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    }

    .loading {
      display: none;
      text-align: center;
      padding: 2rem;
      color: var(--text-light);
    }

    .loading.show {
      display: block;
    }

    .spinner {
      width: 40px;
      height: 40px;
      border: 4px solid var(--border);
      border-top: 4px solid var(--primary);
      border-radius: 50%;
      animation: spin 1s linear infinite;
      margin: 0 auto 1rem;
    }

    .user-idea-display {
      background: linear-gradient(135deg, #f0f4ff 0%, #e0e7ff 100%);
      border-left: 4px solid var(--primary);
      border-radius: 1rem;
      padding: 1.5rem;
      margin-bottom: 2rem;
    }

    .user-idea-label {
      font-weight: 600;
      color: var(--text);
      margin-bottom: 0.5rem;
    }

    .user-idea-text {
      color: var(--text-light);
      line-height: 1.6;
      white-space: pre-line;
    }

    @keyframes fadeInUp {
      from {
        opacity: 0;
        transform: translateY(30px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    @keyframes spin {
      0% { transform: rotate(0deg); }
      100% { transform: rotate(360deg); }
    }

    @media (max-width: 768px) {
      .container {
        padding: 1rem;
      }
      
      .title {
        font-size: 2rem;
      }
      
      .progress-bar {
        flex-direction: column;
        gap: 1rem;
      }
      
      .progress-step::after {
        display: none;
      }
      
      .options-grid {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
      }
      
      .button-group {
        flex-direction: column;
      }
    }

/* 页脚样式 */
footer {
            padding: 30px 20px;
            text-align: center;
}
        
 /* 页脚链接样式 */
.footer-link {
    color: inherit; /* 继承父元素的颜色 */
    text-decoration: none; /* 去掉下划线 */
    transition: opacity 0.3s ease; /* 添加过渡效果 */
}

.footer-link:hover {
    opacity: 0.7; /* 鼠标悬停时变淡 */
    text-decoration: underline; /* 鼠标悬停时显示下划线 */
}

        /* 备案号链接样式 */
        .beian-link {
            color: #333;
            text-decoration: none;
            font-size: 14px;
        }
        
        .beian-link:hover {
            color: #f5f5f5;
            text-decoration: underline;
        }