:root {
            --primary: #4687f0;
            --primary-dark: #2558b8;
            --primary-light: #73b8ff;
            --dark: #1a1a1a;
            --gray: #666;
            --light-gray: #f8f8f8;
            --white: #fff;
            --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            --radius: 6px;
            --transition: 0.3s ease;
            --nav-height: 80px;
            --nav-height-mobile: 64px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            list-style: none;
            text-decoration: none;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: "Microsoft Yahei", "PingFang SC", -apple-system, BlinkMacSystemFont, sans-serif;
            color: var(--gray);
            background: #fff;
            line-height: 1.6;
            overflow-x: hidden;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: inherit;
        }

        /* ===== 导航栏 ===== */
        .header-nav-wrap {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 99999;
            padding: 0 clamp(16px, 4%, 60px);
            min-height: var(--nav-height-mobile);
            display: flex;
            align-items: center;
            justify-content: space-between;
            transition: background var(--transition), box-shadow var(--transition);
            background: rgba(0, 0, 0, 0.2);
            backdrop-filter: blur(2px);
            -webkit-backdrop-filter: blur(2px);
        }
        .header-nav-wrap.fixed-nav {
            background: #ffffff;
            box-shadow: var(--shadow);
            backdrop-filter: none;
            -webkit-backdrop-filter: none;
        }
        .logo {
            flex-shrink: 0;
            display: flex;
            align-items: center;
            z-index: 10;
        }
        .logo img {
            height: clamp(44px, 6vw, 76px);
            width: auto;
            object-fit: contain;
        }
        .nav-list {
            display: flex;
            align-items: center;
            gap: clamp(6px, 1.2vw, 16px);
        }
        .nav-list li a {
            display: block;
            color: #fff;
            font-size: clamp(14px, 1.1vw, 16px);
            padding: 8px 12px;
            position: relative;
            transition: color var(--transition);
            white-space: nowrap;
            font-weight: 500;
            letter-spacing: 0.3px;
        }
        .header-nav-wrap.fixed-nav .nav-list li a {
            color: #333;
        }
        .nav-list li a::after {
            content: '';
            position: absolute;
            left: 12px;
            bottom: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            transition: width var(--transition);
        }
        .nav-list li a:hover {
            color: var(--primary);
        }
        .nav-list li a:hover::after {
            width: calc(100% - 24px);
        }
        .header-nav-wrap.fixed-nav .nav-list li a:hover {
            color: var(--primary);
        }
        .nav-list li a.active {
            color: var(--primary) !important;
        }
        .nav-list li a.active::after {
            width: calc(100% - 24px);
        }
        .header-nav-wrap.fixed-nav .nav-list li a.active {
            color: var(--primary) !important;
        }
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 6px 4px;
            z-index: 20;
            background: transparent;
            border: none;
            outline: none;
        }
        .hamburger span {
            display: block;
            width: 28px;
            height: 3px;
            background: #fff;
            border-radius: 2px;
            transition: all var(--transition);
            transform-origin: center;
        }
        .header-nav-wrap.fixed-nav .hamburger span {
            background: #333;
        }
        .hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 6px);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -6px);
        }

        /* ===== 页面横幅 ===== */
        .page-banner {
            width: 100%;
            height: 50vh;
            min-height: 360px;
            max-height: 600px;
            position: relative;
            overflow: hidden;
            background: url("/tgy/bj4.jpg") center/cover no-repeat;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.35);
            z-index: 1;
        }
        .page-banner .banner-content {
            position: relative;
            z-index: 2;
            color: #fff;
            padding: 0 20px;
        }
        .page-banner .banner-title {
            font-size: clamp(36px, 6vw, 72px);
            font-weight: 700;
            letter-spacing: 4px;
            margin-bottom: 8px;
            text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
        }
        .page-banner .banner-sub {
            font-size: clamp(16px, 1.4vw, 24px);
            color: #cce0ff;
            letter-spacing: 2px;
            font-weight: 300;
        }
        .page-banner .banner-line {
            width: 60px;
            height: 3px;
            background: var(--primary);
            margin: 16px auto 0;
            border-radius: 2px;
        }

        /* ===== 联系信息主区域（新设计） ===== */
        .contact-main {
            width: 100%;
            max-width: 1300px;
            margin: 0 auto;
            padding: clamp(50px, 8vh, 80px) clamp(20px, 4vw, 60px);
        }
        .contact-main .section-tit {
            font-size: clamp(20px, 2vw, 28px);
            color: #333;
            text-align: center;
            margin-bottom: 40px;
            font-weight: 500;
            letter-spacing: 1px;
        }
        .contact-main .section-tit span {
            color: var(--primary);
        }

        /* 双栏容器 */
        .contact-wrapper {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: start;
        }

        /* ---- 左侧：联系信息 ---- */
        .contact-info {
            background: var(--light-gray);
            border-radius: 12px;
            padding: clamp(28px, 3vw, 40px) clamp(24px, 3vw, 36px);
            transition: all var(--transition);
            border: 1px solid transparent;
        }
        .contact-info:hover {
            background: #fff;
            border-color: var(--primary);
            box-shadow: 0 8px 30px rgba(70, 135, 240, 0.08);
            transform: translateY(-4px);
        }
        .contact-info .info-item {
            display: flex;
            align-items: flex-start;
            gap: 14px;
            padding: 14px 0;
            border-bottom: 1px solid #e8ecf0;
        }
        .contact-info .info-item:last-child {
            border-bottom: none;
        }
        .contact-info .info-icon {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            flex-shrink: 0;
            margin-top: 2px;
        }
        .contact-info .info-label {
            font-size: 13px;
            color: #999;
            font-weight: 500;
            letter-spacing: 0.5px;
        }
        .contact-info .info-value {
            font-size: clamp(15px, 1vw, 17px);
            color: #1a2a4a;
            font-weight: 500;
            margin-top: 2px;
        }
        .contact-info .info-value a {
            color: var(--primary);
            transition: color var(--transition);
        }
        .contact-info .info-value a:hover {
            color: var(--primary-dark);
        }
        .contact-info .info-value small {
            font-weight: 400;
            color: #999;
            font-size: 13px;
            display: block;
            margin-top: 4px;
        }
        .module-title {
  font-size: 22px;
  font-weight: bold;
  color: #1a1a1a;
  margin: 0 0 12px 0;
}

/* 标题下方描述小字：左右统一 */
.module-desc {
  font-size: 16px;
  color: #666666;
  margin: 0 0 24px 0;
}
        /* 地图占位（在联系信息内） */
        .contact-info .map-placeholder {
            margin-top: 16px;
            border-radius: 8px;
            overflow: hidden;
            background: #e8ecf0;
            min-height: 140px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #999;
            font-size: 14px;
            border: 1px solid #e0e4e8;
            position: relative;
        }
        .contact-info .map-placeholder .map-icon {
            font-size: 32px;
            margin-right: 8px;
            opacity: 0.5;
        }
        .contact-info .map-placeholder .map-text {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        /* ---- 右侧：留言表单 ---- */
        .contact-form {
            background: var(--light-gray);
            border-radius: 12px;
            padding: clamp(28px, 3vw, 40px) clamp(24px, 3vw, 36px);
            transition: all var(--transition);
            border: 1px solid transparent;
        }
        .contact-form:hover {
            background: #fff;
            border-color: var(--primary);
            box-shadow: 0 8px 30px rgba(70, 135, 240, 0.08);
            transform: translateY(-4px);
        }
        .contact-form .form-title {
            font-size: clamp(18px, 1.3vw, 22px);
            color: #1a2a4a;
            font-weight: 600;
            margin-bottom: 6px;
        }
        .contact-form .form-sub {
            font-size: clamp(13px, 0.9vw, 15px);
            color: #999;
            margin-bottom: 20px;
        }
        .contact-form .form-group {
            margin-bottom: 18px;
        }
        .contact-form .form-group label {
            display: block;
            font-size: 14px;
            color: #555;
            font-weight: 500;
            margin-bottom: 4px;
        }
        .contact-form .form-group input,
        .contact-form .form-group textarea {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid #dce0e5;
            border-radius: 8px;
            font-size: 15px;
            color: #333;
            background: #fff;
            transition: border-color var(--transition), box-shadow var(--transition);
            outline: none;
            font-family: inherit;
        }
        .contact-form .form-group input:focus,
        .contact-form .form-group textarea:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(70, 135, 240, 0.12);
        }
        .contact-form .form-group textarea {
            resize: vertical;
            min-height: 100px;
        }
        .contact-form .form-group input::placeholder,
        .contact-form .form-group textarea::placeholder {
            color: #bbb;
            font-size: 14px;
        }
        .contact-form .submit-btn {
            width: 100%;
            padding: 14px;
            background: var(--primary);
            color: #fff;
            border: none;
            border-radius: 8px;
            font-size: 18px;
            font-weight: 600;
            cursor: pointer;
            transition: background var(--transition), transform var(--transition);
            letter-spacing: 1px;
        }
        .contact-form .submit-btn:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
        }

        /* ===== 页脚 ===== */
        footer {
            width: 100%;
            background: var(--dark);
            color: #ccc;
            padding: clamp(40px, 8vh, 80px) clamp(20px, 4vw, 60px) 30px;
            position: relative;
        }
        .back-top-btn {
            width: clamp(48px, 5vw, 60px);
            height: clamp(48px, 5vw, 60px);
            border-radius: 50%;
            background: #444;
            color: #fff;
            font-size: clamp(20px, 2vw, 28px);
            display: flex;
            align-items: center;
            justify-content: center;
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            top: -30px;
            cursor: pointer;
            transition: background var(--transition);
            border: none;
        }
        .back-top-btn:hover {
            background: var(--primary);
        }
        .footer-top-wrap {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
            gap: clamp(30px, 4vw, 60px);
            margin-bottom: 50px;
        }
        .footer-column h3 {
            font-size: clamp(18px, 1.3vw, 20px);
            color: #fff;
            font-weight: 400;
            margin-bottom: 20px;
            padding-left: 16px;
            position: relative;
        }
        .footer-column h3::before {
            content: "|";
            position: absolute;
            left: 0;
            color: #fff;
            font-size: 22px;
        }
        .footer-column ul li {
            margin-bottom: 12px;
        }
        .footer-column ul li a {
            color: #ccc;
            font-size: clamp(13px, 0.9vw, 14px);
            transition: color var(--transition);
        }
        .footer-column ul li a:hover {
            color: var(--primary-light);
        }
        .footer-qrcode-box {
            text-align: right;
            display: flex;
            flex-direction: column;
            align-items: flex-end;
        }
        .footer-qrcode-title {
            font-size: clamp(16px, 1.2vw, 18px);
            color: #ccc;
            letter-spacing: 2px;
            margin-bottom: 16px;
            font-style: italic;
        }
        .footer-qrcode {
            width: clamp(140px, 15vw, 220px);
            height: auto;
            aspect-ratio: 1/1;
            border: 8px solid #fff;
            border-radius: 4px;
            max-width: 220px;
        }
        .footer-copyright {
            border-top: 1px solid #333;
            padding-top: 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 12px;
            font-size: clamp(12px, 0.8vw, 14px);
            color: #888;
        }
        .copyright-left {
            display: flex;
            align-items: center;
            flex-wrap: nowrap;
            gap: 6px;
        }
        .copyright-left img {
            height: 20px;
        }
        .copyright-right {
            flex-shrink: 0;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 992px) {
            .contact-wrapper {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .page-banner {
                height: 40vh;
                min-height: 280px;
            }
        }

        @media (max-width: 768px) {
            .header-nav-wrap {
                min-height: var(--nav-height-mobile);
                padding: 0 16px;
                background: rgba(0, 0, 0, 0.3);
            }
            .header-nav-wrap.fixed-nav {
                background: #fff;
            }
            .nav-list {
                position: fixed;
                top: 0;
                left: 0;
                width: 100%;
                height: 100vh;
                background: rgba(0, 0, 0, 0.92);
                flex-direction: column;
                justify-content: center;
                align-items: center;
                gap: 8px;
                transform: translateX(100%);
                transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
                padding: 80px 20px 40px;
                backdrop-filter: blur(10px);
                -webkit-backdrop-filter: blur(10px);
            }
            .nav-list.open {
                transform: translateX(0);
            }
            .nav-list li a {
                color: #fff !important;
                font-size: 20px;
                padding: 12px 20px;
                border-bottom: 1px solid rgba(255, 255, 255, 0.06);
                width: 100%;
                text-align: center;
            }
            .nav-list li a::after {
                display: none;
            }
            .nav-list li a:hover {
                color: var(--primary-light) !important;
            }
            .nav-list li a.active {
                color: var(--primary-light) !important;
            }
            .hamburger {
                display: flex;
            }
            .header-nav-wrap.fixed-nav .hamburger span {
                background: #333;
            }

            .page-banner {
                height: 35vh;
                min-height: 220px;
            }
            .page-banner .banner-title {
                font-size: 28px;
            }
            .page-banner .banner-sub {
                font-size: 14px;
            }

            .contact-main {
                padding: 30px 16px;
            }
            .contact-main .section-tit {
                font-size: 18px;
                margin-bottom: 24px;
            }
            .contact-info,
            .contact-form {
                padding: 20px;
            }
            .contact-info .info-item {
                flex-direction: column;
                gap: 4px;
                padding: 12px 0;
            }
            .contact-info .info-icon {
                width: 36px;
                height: 36px;
                font-size: 16px;
            }

            footer {
                padding: 40px 16px 20px;
            }
            .footer-top-wrap {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
                margin-bottom: 30px;
            }
            .footer-qrcode-box {
                text-align: left;
                grid-column: 1 / -1;
            }
            .footer-qrcode {
                width: 140px;
                border-width: 6px;
            }
            .footer-copyright {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 8px;
        padding: 12px 8px;
        font-size: 12px;
    }

    /* 左侧内容：强制换行，居中，允许内部元素换行 */
    .copyright-left {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        align-items: center;
        gap: 4px 6px;
        width: 100%;
        max-width: 100%;
        box-sizing: border-box;
    }

    /* 所有文字、链接允许换行，去除强制不换行 */
    .copyright-left span,
    .copyright-left a,
    .copyright-left text {
        white-space: normal !important;
        word-break: break-word;
    }

    /* 安全图标限制尺寸，防止溢出 */
    .copyright-left .safe-icon {
        max-height: 18px;
        width: auto;
        display: inline-block;
    }

    /* 技术支持也居中，自动换行 */
    .copyright-right {
        text-align: center;
        width: 100%;
        word-break: break-word;
    }
            .back-top-btn {
                width: 48px;
                height: 48px;
                font-size: 20px;
                top: -24px;
            }
        }

        @media (max-width: 420px) {
            .page-banner {
                height: 30vh;
                min-height: 180px;
            }
            .page-banner .banner-title {
                font-size: 24px;
            }
            .footer-top-wrap {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .footer-qrcode-box {
                text-align: center;
            }
            .footer-qrcode {
                width: 120px;
            }
            .contact-info .info-icon {
                width: 32px;
                height: 32px;
                font-size: 14px;
            }
        }

        /* ===== 滚动条美化 ===== */
        ::-webkit-scrollbar {
            width: 6px;
        }
        ::-webkit-scrollbar-track {
            background: #f0f0f0;
        }
        ::-webkit-scrollbar-thumb {
            background: var(--primary);
            border-radius: 3px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--primary-dark);
        }