:root{
      /* 品牌色彩保持不变 */
      --brand-primary: #3b82f6;      /* 主蓝色 */
      --brand-secondary: #8b5cf6;    /* 辅助紫色 */
      --brand-gradient: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
      --accent: #f97316;             /* 亮橙色用于突出按钮和交互元素 */
      --accent-hover: #ea580c;
      --ink: #0f172a;                 /* 深色文字 */
      --muted: #64748b;               /* 次级文字 */
      --light-muted: #94a3b8;         /* 更浅的文字 */
      --bg-dark: #0f172a;             /* 顶部/底部深色 */
      --bg-light: #f8fafc;            /* 浅色背景 */
      --card: #ffffff;                /* 白卡片 */
      --border: #e2e8f0;              /* 边框色 */
      --radius: 12px;
      --shadow: 0 10px 25px -5px rgba(59, 130, 246, 0.1), 0 8px 10px -6px rgba(59, 130, 246, 0.05);
      --shadow-hover: 0 20px 25px -5px rgba(59, 130, 246, 0.1), 0 10px 10px -5px rgba(59, 130, 246, 0.04);
      --maxw: 1200px;
      --transition: all 0.3s ease;
    }
    *{box-sizing:border-box}
    html,body{margin:0;height:100%;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Inter,"Helvetica Neue",Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;color:var(--ink);background:var(--bg-light);scroll-behavior: smooth;}
    a{color:inherit;text-decoration:none}
    img{max-width:100%;display:block;border-radius:var(--radius);}
    .container{max-width:var(--maxw);margin:0 auto;padding:0 20px}

    /* 顶部导航 - 保持不变 */
    header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--border);transition: var(--transition);}
    header.scrolled {box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);}
    .nav{display:flex;align-items:center;justify-content:space-between;height:72px}
    .logo{display:flex;gap:10px;align-items:center;font-weight:800;letter-spacing:.3px;font-size:1.25rem;color:var(--brand-primary);}
    .logo .dot{width:12px;height:12px;background:var(--brand-gradient);border-radius:50%}
    nav ul{display:flex;gap:32px;list-style:none;margin:0;padding:0}
    nav a{font-size:15px;color:var(--ink);font-weight:500;position:relative;padding:5px 0;transition: var(--transition);}
    nav a:hover{color:var(--brand-primary);}
    nav a:after{content:'';position:absolute;bottom:0;left:0;width:0;height:2px;background:var(--brand-gradient);transition: var(--transition);}
    nav a:hover:after{width:100%;}
    .cta{display:inline-flex;align-items:center;gap:10px;background:var(--accent);color:#fff;padding:10px 20px;border-radius:999px;box-shadow:0 4px 6px -1px rgba(249, 115, 22, 0.2);font-weight:500;transition: var(--transition);}
    .cta:hover{transform:translateY(-2px);background:var(--accent-hover);box-shadow:0 10px 15px -3px rgba(249, 115, 22, 0.2);}

    /* 面包屑导航 - 保持 */
    .breadcrumb {
      padding: 20px 0;
      font-size: 14px;
      color: var(--muted);
      background: var(--bg-light);
      border-bottom: 1px solid var(--border);
    }
    .breadcrumb-container {
      max-width: var(--maxw);
      margin: 0 auto;
      padding: 0 20px;
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }
    .breadcrumb a {
      color: var(--muted);
      transition: var(--transition);
    }
    .breadcrumb a:hover {
      color: var(--brand-primary);
    }
    .breadcrumb span.separator {
      color: var(--light-muted);
    }
    .breadcrumb span.current {
      color: var(--ink);
      font-weight: 500;
    }

    /* 留言板区域样式 */
    .message-board {
      padding: 60px 0;
      background: var(--bg-light);
    }
    
    .message-container {
      max-width: 800px;
      margin: 0 auto;
      background: var(--card);
      border-radius: var(--radius);
      padding: 40px;
      box-shadow: var(--shadow);
      border: 1px solid var(--border);
    }
    
    .message-header {
      text-align: center;
      margin-bottom: 30px;
      padding-bottom: 20px;
      border-bottom: 1px solid var(--border);
    }
    
    .message-title {
      font-size: 28px;
      margin: 0 0 10px;
      color: var(--ink);
    }
    
    .message-subtitle {
      color: var(--muted);
      margin: 0;
      font-weight: normal;
    }
    
    /* 表单样式 */
    .message-form {
      display: grid;
      gap: 20px;
    }
    
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    
    .form-label {
      font-weight: 500;
      color: var(--ink);
      font-size: 15px;
    }
    
    .form-input,
    .form-textarea {
      padding: 12px 15px;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      font-size: 16px;
      transition: var(--transition);
      font-family: inherit;
    }
    
    .form-input:focus,
    .form-textarea:focus {
      outline: none;
      border-color: var(--brand-primary);
      box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
    }
    
    .form-textarea {
      min-height: 180px;
      resize: vertical;
    }
    
    /* 验证码区域 */
    .captcha-group {
      display: flex;
      gap: 15px;
      align-items: center;
    }
    
    .captcha-image {
      width: 150px;
      height: 50px;
      background-color: #f0f0f0;
      border-radius: var(--radius);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      letter-spacing: 5px;
      color: var(--ink);
      user-select: none;
      cursor: pointer;
      position: relative;
      overflow: hidden;
    }
    
    .captcha-image canvas {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
    }
    
    .captcha-refresh {
      color: var(--muted);
      cursor: pointer;
      transition: var(--transition);
      margin-left: auto;
    }
    
    .captcha-refresh:hover {
      color: var(--brand-primary);
    }
    
    .captcha-input {
      flex-grow: 1;
    }
    
    /* 提交按钮 */
    .submit-button {
      background: var(--accent);
      color: white;
      border: none;
      padding: 14px 20px;
      border-radius: var(--radius);
      font-size: 16px;
      font-weight: 500;
      cursor: pointer;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    
    .submit-button:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 10px 15px -3px rgba(249, 115, 22, 0.2);
    }
    
    .submit-button i {
      transition: transform 0.3s ease;
    }
    
    .submit-button:hover i {
      transform: translateX(3px);
    }
    
    .submit-button.loading {
      background: var(--muted);
      cursor: not-allowed;
    }
    
    .submit-button.loading i {
      animation: spin 1s linear infinite;
      transform: none;
    }
    
    @keyframes spin {
      0% { transform: rotate(0deg); }
      100% { transform: rotate(360deg); }
    }
    
    /* 表单验证提示 */
    .form-error {
      color: #ef4444;
      font-size: 14px;
      min-height: 18px;
      display: none;
    }
    
    .form-group.error .form-input,
    .form-group.error .form-textarea {
      border-color: #ef4444;
    }
    
    .form-group.error .form-error {
      display: block;
    }
    
    /* 消息提示 */
    .message-alert {
      padding: 15px 20px;
      border-radius: var(--radius);
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      gap: 10px;
      opacity: 0;
      transform: translateY(-20px);
      transition: opacity 0.5s ease, transform 0.5s ease;
    }
    
    .message-alert.show {
      opacity: 1;
      transform: translateY(0);
    }
    
    .success-message {
      background-color: #10b981;
      color: white;
    }
    
    .error-message {
      background-color: #ef4444;
      color: white;
    }
    
    /* 底部 - 保持不变 */
    footer{background:var(--bg-dark);color:#e2e8f0;padding:80px 0 40px;position:relative;}
    footer:before{
      content:'';
      position:absolute;
      top:0;
      left:0;
      width:100%;
      height:8px;
      background:var(--brand-gradient);
    }
    .foot{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:40px;}
    .foot-col h4{margin:0 0 20px;font-size:18px;color:white;position:relative;display:inline-block;}
    .foot-col h4:after{
      content:'';
      position:absolute;
      bottom:-6px;
      left:0;
      width:30px;
      height:2px;
      background:var(--accent);
    }
    .foot-col p{margin:0 0 16px;line-height:1.7;color:#94a3b8;}
    .contact-info{display:flex;align-items:center;gap:12px;margin-bottom:16px;color:#94a3b8;}
    .contact-info i{color:var(--accent);width:20px;text-align:center;}
    .social-links{display:flex;gap:12px;margin-top:20px;}
    .social-links a{width:36px;height:36px;border-radius:50%;background:rgba(255,255,255,0.1);display:flex;align-items:center;justify-content:center;color:white;transition: var(--transition);}
    .social-links a:hover{background:var(--accent);transform: translateY(-3px);}
    .foot-nav{display:flex;flex-wrap:wrap;gap:10px 20px;}
    .foot-nav a{color:#94a3b8;transition: var(--transition);}
    .foot-nav a:hover{color:white;}
    .copyright{margin-top:40px;border-top:1px solid rgba(255,255,255,.1);padding-top:24px;color:#94a3b8;font-size:14px;text-align:center;}

    /* 响应式调整 */
    @media (max-width: 768px) {
      nav ul{display:none}
      .message-container {
        padding: 25px;
      }
      .message-title {
        font-size: 24px;
      }
      .captcha-group {
        flex-direction: column;
        align-items: stretch;
      }
      .captcha-image {
        width: 100%;
      }
      .captcha-refresh {
        align-self: flex-end;
        margin-top: -35px;
        margin-right: 10px;
        z-index: 1;
      }
    }