* {margin: 0;padding: 0;box-sizing: border-box;}
        body { 
            font-family: "Microsoft Yahei", Arial, sans-serif; 
            margin: 0 auto; 
            color: #333; 
            line-height: 1.6;
            background-color: #f9f9f9;
            padding: 0;
        }
        .top-header {
            background: #fff;
            border-bottom: 1px solid #eee;
            position: relative;
            z-index: 999;
        }
        .header-main {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 20px;
        }
        .current-nav{
            background: #2896F0;
            padding: 6px 10px; 
            border-radius: 5px;
        }
        .nav-toggle {
            width: 30px;
            height: 30px;
            display: flex;
            flex-direction: column;
            justify-content: space-around;
            cursor: pointer;
            display: none;
        }
        .nav-toggle span {
            width: 100%;
            height: 3px;
            background: #333;
            border-radius: 2px;
        }
        .page-title {
            font-size: 22px;
            color: #333;
            text-align: center;
            flex: 1;
            margin: 0 20px;
        }
        .navigation-bar {
            background: #2175d9;
            padding: 12px 20px;
        }
        .nav-items {
            list-style: none;
            display: flex;
            gap: 5px;
            justify-content: flex-start;
            max-width: 939.9px;
            margin: 0 auto;
        }
        .nav-items li a {
            color: #fff;
            text-decoration: none;
            font-size: 16px;
            padding: 6px 10px; 
        }
        .nav-items li a:hover {
           background: #2896F0;
           padding: 6px 10px; 
           border-radius: 5px; 
        }
        .phone-nav {
            position: fixed;
            top: 0;
            left: -280px;
            width: 280px;
            height: 100vh;
            background: #fff;
            box-shadow: 2px 0 10px rgba(0,0,0,0.2);
            padding-top: 70px;
            transition: left 0.3s ease;
            z-index: 9999;
        }
        .phone-nav.show {
            left: 0;
        }
        .phone-nav-list {
            list-style: none;
            padding: 0 20px;
        }
        .phone-nav-list li {
            border-bottom: 1px solid #eee;
        }
        .phone-nav-list li a {
            display: block;
            padding: 15px 0;
            color: #333;
            text-decoration: none;
            font-size: 16px;
        }
        .mask-layer {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.5);
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
            z-index: 9998;
        }
        .mask-layer.show {
            opacity: 1;
            visibility: visible;
        }
        #content-wrapper {
            max-width: 940px;
            margin: 0 auto;
        }
        .section-block {
            margin-bottom: 10px;
        }
        .calc-module .header-area {
            margin-bottom: 20px;
        }
        .calc-module .main-title {
            font-size: 24px;
            color: #2c3e50;
            margin-bottom: 10px;
        }
        .content-card {
            background: #fff;
            border: 1px solid #eee;
            border-radius: 8px;
            padding: 20px;
            margin-top: 10px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
        }
        .content-card .card-header {
            margin-bottom: 15px;
        }
        .content-card .card-header .card-title {
            font-size: 18px;
            color: #2175d9;
            margin-bottom: 5px;
        }
        .content-card .card-header p {
            color: #666;
            font-size: 13px;
        }
        .tent {
            width: 43%;
        }
        .input-group {
            margin-bottom: 15px;
        }
        .input-wrapper {
            display: flex;
            align-items: center;
            margin-bottom: 10px;
        }
        .label-text {
            text-align: right;
            padding-right: 10px;
            color: #666;
        }
        .input-content {
            flex: 1;
        }
        input, select {
            padding: 8px 10px;
            border: 1px solid #ced4da;
            border-radius: 4px;
            width: 100%;
            max-width: 300px;
        }
        .action-btn {
            display: inline-block;
            padding: 8px 16px;
            font-size: 14px;
            font-weight: 400;
            text-align: center;
            white-space: nowrap;
            vertical-align: middle;
            cursor: pointer;
            background-image: none;
            border: 1px solid transparent;
            border-radius: 4px;
            text-decoration: none;
            transition: all 0.2s ease;
            color: #fff;
            background-color: #2175d9;
            border-color: #1e69c3;
        }
        .action-btn:hover {
            background-color: #1e69c3;
            border-color: #1a5cad;
        }
        .row-layout {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
        }
        .row-layout .content-card {
            flex: 1;
            min-width: 300px;
            margin-bottom: 0;
        }
        .result-box {
            margin-top: 15px;
            padding: 10px;
            background: #f8f9fa;
            border-radius: 4px;
            border-left: 3px solid #2175d9;
            color: #333;
            font-size: 15px;
        }
        .intro-section {
            background: #fff;
            border: 1px solid #eee;
            border-radius: 8px;
            padding: 20px;
            margin-bottom: 20px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
        }
        .intro-section .header-area {
            margin-bottom: 15px;
        }
        .intro-section .section-title {
            font-size: 18px;
            color: #2175d9;
            font-weight: bold;
        }
        .intro-section ul {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
        }
        .intro-section ul li {
            width: calc(50% - 7.5px);
            padding: 5px 0;
        }
        .page-footer {
            text-align: center;
            padding: 20px;
            color: #666;
            font-size: 14px;
            background: #f8f9fa;
            margin-top: 30px;
            max-width: 940px;
            margin-left: auto;
            margin-right: auto;
            border-radius: 4px;
        }
        .page-footer a {
            color: #666;  
            text-decoration: none;
        }
        .page-footer a:hover {
            color: #ff0000;  
        }
        .scroll-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: #4361ee;
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
            z-index: 9999;
            line-height: 1;
        }
        .scroll-top.visible {
            opacity: 1;
            visibility: visible;
        }
        .scroll-top:hover {
            background: #3a56d4;
        }
        @media (max-width: 1024px) {
            .nav-toggle {
                display: flex;
            }
            .navigation-bar {
                display: none;
            }
            .scroll-top {
                width: 45px;
                height: 45px;
                font-size: 18px;
                bottom: 20px;
                right: 20px;
            }
            .top-header, .page-footer {
                max-width: 100%;
                padding-left: 15px;
                padding-right: 15px;
            }
        }
        @media (max-width: 768px) {
            .row-layout {
                flex-direction: column;
            }
            .row-layout .content-card {
                min-width: 100%;
                margin-bottom: 20px;
            }
            .input-wrapper {
                flex-wrap: wrap;
            }
            .label-text {
                width: 100%;
                text-align: left;
                margin-bottom: 5px;
            }
            input, select {
                max-width: 100%;
            }
            .intro-section ul li {
                width: 100%;
            }
            #content-wrapper {
                padding: 16px 15px;
            }
        }