/* ==========================================================================
           1. 承袭全局核心变量与基础样式
           ========================================================================== */
        :root {
            --primary-color: #0056b3;
            --secondary-color: #ff6600;
            --text-dark: #333333;
            --bg-light: #f8f9fa;
            --border-color: #e0e0e0;
        }

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

        html { 
            scroll-behavior: smooth; 
            scroll-padding-top: 130px; 
        }

        body { 
            font-family: "Helvetica Neue", Helvetica, Arial, "Microsoft YaHei", sans-serif; 
            line-height: 1.6; 
            color: var(--text-dark); 
            background-color: #fff; 
            -webkit-font-smoothing: antialiased; 
        }

        .container { 
            width: 100%; 
            max-width: 1200px; 
            margin: 0 auto; 
            padding: 0 20px; 
        }
        
        /* 按钮公用样式 */
        .btn { 
            display: inline-block; 
            background: var(--secondary-color); 
            color: #fff; 
            padding: 12px 28px; 
            text-decoration: none; 
            border-radius: 4px; 
            font-weight: bold; 
            transition: background 0.3s; 
            text-align: center; 
            font-size: 1rem; 
            border: none; 
            cursor: pointer; 
        }
        .btn:hover { 
            background: #e05500; 
        }

        /* ==========================================================================
           2. Header 头部样式
           ========================================================================== */
        header { 
            background: #fff; 
            box-shadow: 0 2px 10px rgba(0,0,0,0.05); 
            position: sticky; 
            top: 0; 
            z-index: 1000; 
        }
        .header-top { 
            display: flex; 
            justify-content: space-between; 
            align-items: center; 
            padding: 15px 0; 
            border-bottom: 1px solid #f1f3f5; 
        }
        .logo { 
            flex: 0 0 auto; 
        }
		
		        .bt { font-size: 1.5rem; color: var(--primary-color); line-height: 1.2; font-weight: 700; }
		.logo a {text-decoration: none;}
		
        .logo h1 { 
            font-size: 1.5rem; 
            color: var(--primary-color); 
            line-height: 1.2; 
            font-weight: 700; 
        }
        .logo span { 
            font-size: 0.85rem; 
            color: #666; 
            display: block; 
            margin-top: 4px; 
            letter-spacing: 1px; 
        }
        .header-rt { 
            text-align: right; 
            flex: 0 0 auto; 
        }
        .hotline { 
            font-size: 1.4rem; 
            color: var(--secondary-color); 
            font-weight: bold; 
            text-decoration: none; 
            display: block; 
        }
        .main-nav { 
            background: #fff; 
            padding: 10px 0; 
            display: block; 
        }
        .nav-list { 
            display: flex; 
            list-style: none; 
            gap: 40px; 
            justify-content: center; 
            align-items: center; 
        }
        .nav-list a { 
            text-decoration: none; 
            color: #495057; 
            font-weight: 500; 
            font-size: 1.05rem; 
            transition: all 0.2s; 
            padding: 5px 0; 
            white-space: nowrap; 
        }
        .nav-list a:hover, .nav-list .active { 
            color: var(--primary-color); 
            border-bottom: 2px solid var(--primary-color); 
        }
        .menu-toggle, .menu-btn { 
            display: none; 
        }

        /* ==========================================================================
           3. 面包屑导航样式
           ========================================================================== */
        .breadcrumb { 
            background: var(--bg-light); 
            padding: 12px 0; 
            border-bottom: 1px solid var(--border-color); 
            font-size: 0.9rem; 
        }
        .breadcrumb-list { 
            display: flex; 
            list-style: none; 
            gap: 8px; 
            color: #6c757d; 
        }
        .breadcrumb-list a { 
            color: #495057; 
            text-decoration: none; 
        }
        .breadcrumb-list a:hover { 
            color: var(--primary-color); 
            text-decoration: underline; 
        }
        .breadcrumb-list li:not(:last-child)::after { 
            content: '/'; 
            margin-left: 8px; 
            color: #adb5bd; 
        }
        .breadcrumb-list li:last-child { 
            color: var(--primary-color); 
            font-weight: 500; 
        }

        /* ==========================================================================
           4. 联系我们专属核心布局样式（高度对齐重构版）
           ========================================================================== */
        .contact-wrapper {
            padding: 40px 0 70px;
            background: #fff;
        }

        /* 欢迎寄语致辞卡片 */
        .welcome-message {
            background: #fdf8f4;
            border-left: 4px solid var(--secondary-color);
            padding: 20px 25px;
            margin-bottom: 40px;
            border-radius: 0 6px 6px 0;
        }
        .welcome-message h2 {
            font-size: 1.25rem;
            color: var(--secondary-color);
            margin-bottom: 8px;
            font-weight: bold;
        }
        .welcome-message p {
            font-size: 0.95rem;
            color: #555;
            text-align: justify;
        }

        /* 强对齐网格：确保左右两栏等高（stretch） */
        .contact-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: stretch; /* 强制拉伸对齐高度 */
        }

        /* 左栏：官方联络名片（自适应撑满） */
        .contact-info-card {
            background: #fff;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            padding: 30px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.02);
            display: flex;
            flex-direction: column; /* 内部Flex布局撑高 */
            height: 100%;
        }
        .contact-info-card h3 {
            font-size: 1.4rem;
            color: var(--primary-color);
            margin-bottom: 25px;
            border-bottom: 2px solid var(--primary-color);
            padding-bottom: 10px;
            display: inline-block;
            flex: 0 0 auto;
        }
        .info-items-group {
            flex: 1; /* 撑满剩余纵向空间 */
            display: flex;
            flex-direction: column;
            justify-content: flex-start;
        }
        .info-item-box {
            display: flex;
            margin-bottom: 24px;
            align-items: flex-start;
        }
        .info-item-box:last-child {
            margin-bottom: 0;
        }
        .info-label {
            flex: 0 0 90px;
            font-weight: bold;
            color: #555;
            font-size: 1rem;
        }
        .info-value {
            flex: 1;
            color: #111;
            font-size: 1rem;
            line-height: 1.5;
        }
        .info-value a {
            color: #111;
            text-decoration: none;
        }
        .info-value .highlight-phone {
            font-size: 1.3rem;
            color: var(--secondary-color);
            font-weight: bold;
        }

        /* 右栏：在线快捷留言表单 */
        .contact-form-card {
            background: var(--bg-light);
            border-radius: 6px;
            padding: 30px;
            border: 1px solid #e9ecef;
            display: flex;
            flex-direction: column;
            height: 100%;
        }
        .contact-form-card h3 {
            font-size: 1.3rem;
            margin-bottom: 8px;
            color: #212529;
        }
        .contact-form-card p {
            font-size: 0.85rem;
            color: #6c757d;
            margin-bottom: 20px;
        }
        .contact-form-card form {
            flex: 1;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }
        .form-group-item {
            margin-bottom: 18px;
        }
        .form-group-item label {
            display: block;
            margin-bottom: 6px;
            font-size: 0.9rem;
            font-weight: 500;
            color: #495057;
        }
        .form-group-item label span {
            color: red;
            margin-left: 3px;
        }
        .form-control-input, .form-control-textarea {
            width: 100%;
            padding: 10px 14px;
            border: 1px solid #ced4da;
            border-radius: 4px;
            font-size: 0.95rem;
            color: var(--text-dark);
            background-color: #fff;
            transition: border-color 0.15s ease-in-out;
        }
        .form-control-input:focus, .form-control-textarea:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(0, 86, 179, 0.1);
        }
        .form-control-textarea {
            resize: vertical;
            min-height: 85px;
        }

        /* 验证码专属组合样式 */
        .captcha-flex-container {
            display: flex;
            gap: 12px;
            align-items: center;
        }
        .captcha-flex-container .form-control-input {
            flex: 1;
        }
        .captcha-img-box {
            flex: 0 0 110px;
            height: 40px;
            background: linear-gradient(45deg, #e0e0e0, #f5f5f5);
            border: 1px solid #ced4da;
            border-radius: 4px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-family: "Georgia", serif;
            font-size: 1.2rem;
            font-weight: bold;
            font-style: italic;
            color: var(--primary-color);
            letter-spacing: 4px;
            user-select: none;
            cursor: pointer;
            box-shadow: inset 0 0 4px rgba(0,0,0,0.05);
        }

        .contact-form-card .btn {
            width: 100%;
            padding: 12px;
            font-size: 1.05rem;
            letter-spacing: 1px;
            box-shadow: 0 4px 10px rgba(255, 102, 0, 0.2);
            margin-top: 5px;
        }

        /* ==========================================================================
           5. Footer 页脚样式
           ========================================================================== */
        footer { 
            background: #212529; 
            color: #b5b9bd; 
            padding: 40px 0; 
            text-align: center; 
            font-size: 0.9rem; 
            line-height: 1.8; 
        }
        footer p { 
            margin-bottom: 8px; 
        }
        footer p strong { 
            color: #fff; 
        }
        footer a { 
            color: #fff; 
            text-decoration: none; 
        }
        footer a:hover { 
            text-decoration: underline; 
        }

        /* ==========================================================================
           6. 严格响应式适配断点
           ========================================================================== */
        @media (max-width: 992px) {
            .nav-list { gap: 20px; }
            .logo h1 { font-size: 1.3rem; }
            .hotline { font-size: 1.2rem; }
            .contact-grid { gap: 25px; }
            .contact-info-card, .contact-form-card { padding: 22px; }
        }

        @media (max-width: 768px) {
            html { scroll-padding-top: 90px; }
            .header-top { padding: 10px 0; position: relative; }
            .logo h1 { font-size: 1.1rem; }
            .logo span { font-size: 0.75rem; letter-spacing: 0; }
            .header-rt { margin-right: 45px; text-align: right; }
            .hotline { font-size: 1rem; }
            
            .menu-btn { 
                display: block; 
                position: absolute; 
                right: 20px; 
                top: 50%; 
                transform: translateY(-50%); 
                cursor: pointer; 
                padding: 10px 0; 
                z-index: 1002; 
            }
            .menu-btn .icon-bar { 
                display: block; 
                width: 22px; 
                height: 2px; 
                background: #333; 
                margin: 4px 0; 
                transition: all 0.2s; 
            }
            
            .main-nav { 
                display: block; 
                position: absolute; 
                top: 100%; 
                left: 0; 
                right: 0; 
                background: #fff; 
                border-top: 1px solid var(--border-color); 
                border-bottom: 2px solid var(--primary-color); 
                max-height: 0; 
                overflow: hidden; 
                opacity: 0; 
                transition: all 0.3s ease-in-out; 
                padding: 0; 
            }
            .nav-list { flex-direction: column; gap: 0; width: 100%; padding: 10px 0; }
            .nav-list li { width: 100%; text-align: center; }
            .nav-list a { display: block; padding: 12px 0; font-size: 1rem; border-bottom: 1px solid #f8f9fa; }
            .nav-list li:last-child a { border-bottom: none; }
            .nav-list a:hover { border-bottom: none; background: var(--bg-light); }
            
            .menu-toggle:checked ~ .main-nav { max-height: 400px; opacity: 1; }
            .menu-toggle:checked ~ .menu-btn .icon-bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
            .menu-toggle:checked ~ .menu-btn .icon-bar:nth-child(2) { opacity: 0; }
            .menu-toggle:checked ~ .menu-btn .icon-bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

            /* 移动端降级为单栏流式布局，高度自然撑开即可 */
            .contact-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .welcome-message { padding: 15px; }
        }

        @media (max-width: 414px) {
            .header-rt p { display: none; }
            .logo h1 { font-size: 1rem; }
            .info-label { flex: 0 0 75px; }
        }