/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
}

/* 容器 */
.zf4bffcontainer {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部样式 */
.zf4bffheader {
    background-color: #fff;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.zf4bffheader .zf4bffcontainer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
    position: relative;
}

.zf4bfflogo h1 {
    font-size: 24px;
    color: #1a73e8;
}

/* 导航切换按钮 */
.zf4bffnav-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 21px;
    cursor: pointer;
    z-index: 1001;
}

.zf4bffnav-toggle span {
    display: block;
    height: 3px;
    width: 100%;
    background-color: #1a73e8;
    border-radius: 3px;
    transition: all 0.3s ease;
}

.zf4bffmain-nav ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}

.zf4bffmain-nav li {
    margin-left: 30px;
}

.zf4bffmain-nav a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
    padding: 5px 0;
    position: relative;
}

.zf4bffmain-nav a:hover {
    color: #1a73e8;
}

.zf4bffmain-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: #1a73e8;
    transition: width 0.3s ease;
}

.zf4bffmain-nav a:hover::after {
    width: 100%;
}

/* 移动端导航样式 */
@media (max-width: 768px) {
    .zf4bffnav-toggle {
        display: flex;
    }

    .zf4bffmain-nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background-color: #fff;
        box-shadow: -2px 0 5px rgba(0,0,0,0.1);
        transition: right 0.3s ease;
        z-index: 1000;
    }

    .zf4bffmain-nav.active {
        right: 0;
    }

    .zf4bffmain-nav ul {
        flex-direction: column;
        padding: 80px 20px 20px;
    }

    .zf4bffmain-nav li {
        margin: 0;
        border-bottom: 1px solid #eee;
    }

    .zf4bffmain-nav a {
        display: block;
        padding: 15px 0;
        font-size: 16px;
    }

    .zf4bffmain-nav a::after {
        display: none;
    }

    /* 汉堡菜单动画 */
    .zf4bffnav-toggle.active span:nth-child(1) {
        transform: translateY(9px) rotate(45deg);
    }

    .zf4bffnav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .zf4bffnav-toggle.active span:nth-child(3) {
        transform: translateY(-9px) rotate(-45deg);
    }

    /* 遮罩层 */
    .zf4bffnav-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0,0,0,0.5);
        z-index: 999;
    }

    .zf4bffnav-overlay.active {
        display: block;
    }

    .zf4bffheader .zf4bffcontainer {
        flex-direction: column;
        height: auto;
        padding: 8px;
    }

    .zf4bfflogo h1 {
        font-size: 18px;
        margin-bottom: 4px;
    }
}

/* 英雄区域 */
.zf4bffhero {
    background: linear-gradient(135deg, #1a73e8 0%, #0d47a1 100%);
    color: white;
    padding: 160px 0 80px;
    position: relative;
    overflow: hidden;
}

.zf4bffhero-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
}

.zf4bffhero-text {
    flex: 1;
    max-width: 600px;
}

.zf4bffhero-text h2 {
    font-size: 48px;
    margin-bottom: 20px;
    line-height: 1.2;
}

.zf4bffhero-text p {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.9;
}

.zf4bffhero-image {
    flex: 1;
    max-width: 500px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.zf4bffhero-image img {
    max-width: 100%;
    height: auto;
    /* 新增：放大图片 */
    width: 600px;
    max-height: 400px;
    display: block;
    margin: 0 auto;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    transform: perspective(1000px) rotateY(-5deg);
    transition: transform 0.3s ease;
}

.zf4bffhero-image img:hover {
    transform: perspective(1000px) rotateY(0deg);
}

.zf4bffdownload-buttons {
    display: flex;
    gap: 20px;
}

/* 按钮样式 */
.zf4bffbtn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s;
    margin: 0 10px;
}

.zf4bffbtn-primary {
    background-color: #fff;
    color: #1a73e8;
}

.zf4bffbtn-secondary {
    background-color: transparent;
    border: 2px solid #fff;
    color: #fff;
}

.zf4bffbtn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

/* 特点部分 */
.zf4bfffeatures {
    padding: 80px 0;
    background-color: #f8f9fa;
    border: 1px solid #e0e0e0;
    border-radius: 15px;
    margin: 20px;
}

.zf4bffsection-title {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
    color: #333;
    padding-bottom: 20px;
    border-bottom: 2px solid #1a73e8;
    position: relative;
}

.zf4bffsection-title:after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 2px;
    background: #1a73e8;
}

/* 框架布局 */
.zf4bffrow {
    display: flex;
    flex-wrap: wrap;
    margin: -15px;
    padding: 15px;
    border: 1px solid #e0e0e0;
    border-radius: 10px;
    background: #fff;
}

.zf4bffcol-md-4 {
    flex: 0 0 33.333333%;
    max-width: 33.333333%;
    padding: 15px;
    border-right: 1px solid #e0e0e0;
}

.zf4bffcol-md-4:last-child {
    border-right: none;
}

/* 特点盒子 */
.zf4bfffeature-box {
    background: white;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    height: 100%;
    transition: all 0.3s ease;
    overflow: hidden;
    border: 1px solid #e0e0e0;
}

.zf4bfffeature-box:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    border-color: #1a73e8;
}

.zf4bfffeature-header {
    padding: 25px 25px 15px;
    text-align: center;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border-bottom: 2px solid #1a73e8;
    position: relative;
}

.zf4bfffeature-header:after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 2px;
    background: #1a73e8;
}

.zf4bfffeature-icon {
    font-size: 40px;
    margin-bottom: 15px;
    background: linear-gradient(135deg, #1a73e8 0%, #0d47a1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
    padding: 10px;
    border: 2px solid #1a73e8;
    border-radius: 50%;
}

.zf4bfffeature-header h3 {
    color: #333;
    font-size: 20px;
    margin: 0;
    font-weight: 600;
    padding: 10px 0;
    border-bottom: 1px solid #e0e0e0;
}

.zf4bfffeature-body {
    padding: 20px 25px;
    background: #fff;
}

.zf4bfffeature-list {
    list-style: none;
    padding: 0;
    margin: 0;
    border: 1px solid #e0e0e0;
    border-radius: 5px;
    background: #f8f9fa;
}

.zf4bfffeature-list li {
    color: #666;
    margin: 0;
    padding: 12px 20px;
    position: relative;
    font-size: 14px;
    line-height: 1.5;
    border-bottom: 1px solid #e0e0e0;
    display: flex;
    flex-direction: column;
}

.zf4bfffeature-list li:last-child {
    border-bottom: none;
}

.zf4bfffeature-list li:before {
    content: "✓";
    color: #1a73e8;
    position: absolute;
    left: 0;
    font-weight: bold;
    padding: 0 10px;
}

.zf4bfffeature-detail {
    font-size: 12px;
    color: #888;
    margin-top: 5px;
    padding-left: 20px;
    font-style: italic;
}

.zf4bfffeature-footer {
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px solid #e0e0e0;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.zf4bfffeature-tag {
    background: #f0f7ff;
    color: #1a73e8;
    padding: 5px 10px;
    border-radius: 15px;
    font-size: 12px;
    border: 1px solid #1a73e8;
}

/* 特点盒子内容样式 */
.zf4bfffeature-description {
    margin-bottom: 20px;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 5px;
    border-left: 3px solid #1a73e8;
}

.zf4bfffeature-description p {
    color: #333;
    font-size: 14px;
    line-height: 1.6;
    margin: 0;
}

/* 安全保障部分 */
.zf4bffsecurity {
    padding: 80px 0;
    background-color: #f8f9fa;
}

.zf4bffsecurity-framework {
    margin: 0 -15px;
}

.zf4bffsecurity-row {
    display: flex;
    flex-wrap: wrap;
    margin: 0;
}

.zf4bffsecurity-col {
    flex: 0 0 33.333333%;
    max-width: 33.333333%;
    padding: 15px;
}

.zf4bffsecurity-box {
    background: white;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    height: 100%;
    transition: all 0.3s ease;
    border: 1px solid #e0e0e0;
    overflow: hidden;
}

.zf4bffsecurity-box:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    border-color: #1a73e8;
}

.zf4bffsecurity-header {
    padding: 25px 25px 15px;
    text-align: center;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border-bottom: 2px solid #1a73e8;
    position: relative;
}

.zf4bffsecurity-header:after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 2px;
    background: #1a73e8;
}

.zf4bffsecurity-icon {
    font-size: 40px;
    margin-bottom: 15px;
    background: linear-gradient(135deg, #1a73e8 0%, #0d47a1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
    padding: 10px;
    border: 2px solid #1a73e8;
    border-radius: 50%;
}

.zf4bffsecurity-header h3 {
    color: #333;
    font-size: 20px;
    margin: 0;
    font-weight: 600;
    padding: 10px 0;
    border-bottom: 1px solid #e0e0e0;
}

.zf4bffsecurity-body {
    padding: 20px 25px;
}

.zf4bffsecurity-description {
    margin-bottom: 20px;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 5px;
    border-left: 3px solid #1a73e8;
}

.zf4bffsecurity-description p {
    color: #333;
    font-size: 14px;
    line-height: 1.6;
    margin: 0;
}

.zf4bffsecurity-list {
    list-style: none;
    padding: 0;
    margin: 0;
    border: 1px solid #e0e0e0;
    border-radius: 5px;
    background: #f8f9fa;
}

.zf4bffsecurity-list li {
    padding: 12px 20px;
    border-bottom: 1px solid #e0e0e0;
    display: flex;
    flex-direction: column;
}

.zf4bffsecurity-list li:last-child {
    border-bottom: none;
}

.zf4bffsecurity-title {
    color: #333;
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 5px;
}

.zf4bffsecurity-detail {
    color: #666;
    font-size: 12px;
    line-height: 1.4;
}

.zf4bffsecurity-footer {
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px solid #e0e0e0;
    display: flex;
    justify-content: space-around;
}

.zf4bffsecurity-metric {
    text-align: center;
    padding: 10px;
    background: #f0f7ff;
    border-radius: 5px;
    min-width: 100px;
}

.zf4bffmetric-value {
    display: block;
    color: #1a73e8;
    font-size: 20px;
    font-weight: bold;
    margin-bottom: 5px;
}

.zf4bffmetric-label {
    display: block;
    color: #666;
    font-size: 12px;
}

/* 安全保障响应式布局 */
@media (max-width: 992px) {
    .zf4bffsecurity-col {
        flex: 0 0 50%;
        max-width: 50%;
    }
}

@media (max-width: 768px) {
    .zf4bffsecurity-col {
        flex: 0 0 100%;
        max-width: 100%;
    }

    .zf4bffsecurity-header {
        padding: 20px 20px 10px;
    }

    .zf4bffsecurity-body {
        padding: 15px 20px;
    }

    .zf4bffsecurity-icon {
        font-size: 36px;
    }

    .zf4bffsecurity-header h3 {
        font-size: 18px;
    }

    .zf4bffsecurity-footer {
        flex-direction: column;
        gap: 10px;
    }

    .zf4bffsecurity-metric {
        width: 100%;
    }
}

/* 下载中心部分 */
.zf4bffdownload-section {
    padding: 80px 0;
    background-color: #f8f9fa;
}

.zf4bffdownload-framework {
    margin: 0 -15px;
}

.zf4bffdownload-row {
    display: flex;
    flex-wrap: wrap;
    margin: 0;
}

.zf4bffdownload-col {
    flex: 0 0 50%;
    max-width: 50%;
    padding: 15px;
}

.zf4bffdownload-box {
    background: white;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    height: 100%;
    transition: all 0.3s ease;
    border: 1px solid #e0e0e0;
    overflow: hidden;
}

.zf4bffdownload-box:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    border-color: #1a73e8;
}

.zf4bffdownload-header {
    padding: 25px 25px 15px;
    text-align: center;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border-bottom: 2px solid #1a73e8;
    position: relative;
}

.zf4bffdownload-header:after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 2px;
    background: #1a73e8;
}

.zf4bffdownload-icon {
    font-size: 40px;
    margin-bottom: 15px;
    background: linear-gradient(135deg, #1a73e8 0%, #0d47a1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
    padding: 10px;
    border: 2px solid #1a73e8;
    border-radius: 50%;
}

.zf4bffdownload-header h3 {
    color: #333;
    font-size: 20px;
    margin: 0;
    font-weight: 600;
    padding: 10px 0;
    border-bottom: 1px solid #e0e0e0;
}

.zf4bffdownload-body {
    padding: 20px 25px;
}

.zf4bffdownload-description {
    margin-bottom: 20px;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 5px;
    border-left: 3px solid #1a73e8;
}

.zf4bffdownload-description p {
    color: #333;
    font-size: 14px;
    line-height: 1.6;
    margin: 0;
}

.zf4bffdownload-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    margin-bottom: 20px;
}

.zf4bffinfo-item {
    text-align: center;
    padding: 10px;
    background: #f0f7ff;
    border-radius: 5px;
    border: 1px solid #1a73e8;
}

.zf4bffinfo-label {
    display: block;
    color: #666;
    font-size: 12px;
    margin-bottom: 5px;
}

.zf4bffinfo-value {
    display: block;
    color: #1a73e8;
    font-size: 16px;
    font-weight: 600;
}

.zf4bffdownload-features {
    margin-bottom: 20px;
}

.zf4bfffeature-list {
    list-style: none;
    padding: 0;
    margin: 0;
    border: 1px solid #e0e0e0;
    border-radius: 5px;
    background: #f8f9fa;
}

.zf4bfffeature-list li {
    padding: 12px 20px;
    border-bottom: 1px solid #e0e0e0;
    display: flex;
    flex-direction: column;
}

.zf4bfffeature-list li:last-child {
    border-bottom: none;
}

.zf4bfffeature-title {
    color: #333;
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 5px;
}

.zf4bfffeature-detail {
    color: #666;
    font-size: 12px;
    line-height: 1.4;
}

.zf4bffdownload-footer {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.zf4bffbtn-download {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    background: #1a73e8;
    color: white;
    padding: 12px 30px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s;
    width: 100%;
    max-width: 200px;
}

.zf4bffbtn-download:hover {
    background: #0d47a1;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.zf4bffbtn-icon {
    font-size: 20px;
}

.zf4bffdownload-tags {
    display: flex;
    gap: 10px;
}

.zf4bffdownload-tag {
    background: #f0f7ff;
    color: #1a73e8;
    padding: 5px 15px;
    border-radius: 15px;
    font-size: 12px;
    border: 1px solid #1a73e8;
}

/* 系统要求部分 */
.zf4bffsystem-requirements {
    margin-top: 40px;
    padding: 30px;
    background: white;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.zf4bffrequirements-title {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
    font-size: 24px;
    position: relative;
    padding-bottom: 15px;
}

.zf4bffrequirements-title:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 2px;
    background: #1a73e8;
}

.zf4bffrequirements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.zf4bffrequirement-box {
    background: #f8f9fa;
    border-radius: 8px;
    padding: 20px;
    border: 1px solid #e0e0e0;
    transition: all 0.3s ease;
}

.zf4bffrequirement-box:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    border-color: #1a73e8;
}

.zf4bffrequirement-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid #e0e0e0;
}

.zf4bffrequirement-icon {
    font-size: 24px;
}

.zf4bffrequirement-header h4 {
    color: #333;
    margin: 0;
    font-size: 18px;
}

.zf4bffrequirement-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.zf4bffrequirement-list li {
    color: #666;
    margin-bottom: 8px;
    padding-left: 20px;
    position: relative;
    font-size: 14px;
}

.zf4bffrequirement-list li:before {
    content: "✓";
    color: #1a73e8;
    position: absolute;
    left: 0;
}

/* 下载中心响应式布局 */
@media (max-width: 992px) {
    .zf4bffdownload-col {
        flex: 0 0 100%;
        max-width: 100%;
    }
}

@media (max-width: 768px) {
    .zf4bffdownload-info {
        grid-template-columns: 1fr;
    }

    .zf4bffdownload-header {
        padding: 20px 20px 10px;
    }

    .zf4bffdownload-body {
        padding: 15px 20px;
    }

    .zf4bffdownload-icon {
        font-size: 36px;
    }

    .zf4bffdownload-header h3 {
        font-size: 18px;
    }

    .zf4bffrequirements-grid {
        grid-template-columns: 1fr;
    }

    .zf4bffdownload-footer {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }
    .zf4bffbtn-download {
        max-width: 100%;
        width: 100%;
        margin: 0;
        font-size: 17px;
        padding: 16px 0;
        letter-spacing: 1px;
    }
    .zf4bffdownload-tags {
        justify-content: center;
    }
    .zf4bffdownload-col {
        flex: 0 0 100%;
        max-width: 100%;
        padding: 8px 0;
    }
    .zf4bffdownload-box {
        margin-bottom: 16px;
        padding: 10px 0;
    }
    .zf4bffdownload-description p {
        font-size: 15px;
    }
}

/* 使用指南 */
.zf4bffguide {
    padding: 80px 0;
    background-color: #f8f9fa;
}

.zf4bffguide-framework {
    margin: 0 -15px;
}

.zf4bffguide-steps {
    display: flex;
    flex-wrap: wrap;
    margin: 0 0 40px 0;
    gap: 20px;
}

.zf4bffstep-box {
    flex: 1;
    min-width: 300px;
    background: white;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
    border: 1px solid #e0e0e0;
    overflow: hidden;
}

.zf4bffstep-box:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    border-color: #1a73e8;
}

.zf4bffstep-header {
    padding: 20px;
    text-align: center;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border-bottom: 2px solid #1a73e8;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.zf4bffstep-header:after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 2px;
    background: #1a73e8;
}

.zf4bffstep-number {
    width: 40px;
    height: 40px;
    background: #1a73e8;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: bold;
}

.zf4bffstep-icon {
    font-size: 24px;
}

.zf4bffstep-body {
    padding: 20px;
}

.zf4bffstep-body h3 {
    color: #333;
    font-size: 20px;
    margin-bottom: 15px;
    text-align: center;
}

.zf4bffstep-description {
    margin-bottom: 20px;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 5px;
    border-left: 3px solid #1a73e8;
}

.zf4bffstep-description p {
    color: #333;
    font-size: 14px;
    line-height: 1.6;
    margin: 0;
}

.zf4bffstep-list {
    list-style: none;
    padding: 0;
    margin: 0;
    border: 1px solid #e0e0e0;
    border-radius: 5px;
    background: #f8f9fa;
}

.zf4bffstep-list li {
    padding: 12px 20px;
    border-bottom: 1px solid #e0e0e0;
    display: flex;
    flex-direction: column;
}

.zf4bffstep-list li:last-child {
    border-bottom: none;
}

.zf4bffstep-title {
    color: #333;
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 5px;
}

.zf4bffstep-detail {
    color: #666;
    font-size: 12px;
    line-height: 1.4;
}

.zf4bffguide-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.zf4bffguide-category {
    background: white;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
    border: 1px solid #e0e0e0;
    overflow: hidden;
}

.zf4bffguide-category:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    border-color: #1a73e8;
}

.zf4bffcategory-header {
    padding: 20px;
    text-align: center;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border-bottom: 2px solid #1a73e8;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.zf4bffcategory-header:after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 2px;
    background: #1a73e8;
}

.zf4bffcategory-icon {
    font-size: 24px;
}

.zf4bffcategory-header h3 {
    color: #333;
    font-size: 20px;
    margin: 0;
}

.zf4bffcategory-body {
    padding: 20px;
}

.zf4bffcategory-list {
    list-style: none;
    padding: 0;
    margin: 0;
    border: 1px solid #e0e0e0;
    border-radius: 5px;
    background: #f8f9fa;
}

.zf4bffcategory-list li {
    padding: 12px 20px;
    border-bottom: 1px solid #e0e0e0;
    display: flex;
    flex-direction: column;
}

.zf4bffcategory-list li:last-child {
    border-bottom: none;
}

.zf4bffcategory-title {
    color: #333;
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 5px;
}

.zf4bffcategory-detail {
    color: #666;
    font-size: 12px;
    line-height: 1.4;
}

/* 使用指南响应式布局 */
@media (max-width: 992px) {
    .zf4bffguide-steps {
        flex-direction: column;
    }

    .zf4bffstep-box {
        width: 100%;
    }
}

@media (max-width: 768px) {
    .zf4bffguide-details {
        grid-template-columns: 1fr;
    }

    .zf4bffstep-header,
    .zf4bffcategory-header {
        padding: 15px;
    }

    .zf4bffstep-body,
    .zf4bffcategory-body {
        padding: 15px;
    }

    .zf4bffstep-number {
        width: 35px;
        height: 35px;
        font-size: 18px;
    }

    .zf4bffstep-icon,
    .zf4bffcategory-icon {
        font-size: 20px;
    }

    .zf4bffstep-body h3,
    .zf4bffcategory-header h3 {
        font-size: 18px;
    }
}

/* FAQ部分 */
.zf4bfffaq {
    padding: 80px 0;
    background-color: #f8f9fa;
}

.zf4bfffaq-framework {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin: 0 -15px;
}

.zf4bfffaq-category {
    background: white;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
    border: 1px solid #e0e0e0;
    overflow: hidden;
}

.zf4bfffaq-category:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    border-color: #1a73e8;
}

.zf4bfffaq-header {
    padding: 20px;
    text-align: center;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border-bottom: 2px solid #1a73e8;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.zf4bfffaq-header:after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 2px;
    background: #1a73e8;
}

.zf4bfffaq-icon {
    font-size: 24px;
}

.zf4bfffaq-header h3 {
    color: #333;
    font-size: 20px;
    margin: 0;
}

.zf4bfffaq-body {
    padding: 20px;
}

.zf4bfffaq-item {
    margin-bottom: 20px;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    overflow: hidden;
}

.zf4bfffaq-item:last-child {
    margin-bottom: 0;
}

.zf4bfffaq-question {
    padding: 15px 20px;
    background: #f8f9fa;
    display: flex;
    align-items: center;
    gap: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.zf4bfffaq-question:hover {
    background: #f0f7ff;
}

.zf4bffquestion-icon {
    font-size: 20px;
    color: #1a73e8;
}

.zf4bfffaq-question h4 {
    color: #333;
    font-size: 16px;
    margin: 0;
    flex: 1;
}

.zf4bfffaq-answer {
    padding: 20px;
    background: white;
    display: flex;
    gap: 15px;
}

.zf4bffanswer-icon {
    font-size: 20px;
    color: #1a73e8;
}

.zf4bffanswer-content {
    flex: 1;
}

.zf4bffanswer-content p {
    color: #666;
    font-size: 14px;
    line-height: 1.6;
    margin: 0 0 15px 0;
}

.zf4bffanswer-steps {
    list-style: none;
    padding: 0;
    margin: 0;
    background: #f8f9fa;
    border-radius: 5px;
    border: 1px solid #e0e0e0;
}

.zf4bffanswer-steps li {
    padding: 10px 15px;
    color: #666;
    font-size: 14px;
    border-bottom: 1px solid #e0e0e0;
    position: relative;
    padding-left: 25px;
}

.zf4bffanswer-steps li:last-child {
    border-bottom: none;
}

.zf4bffanswer-steps li:before {
    content: "→";
    color: #1a73e8;
    position: absolute;
    left: 10px;
}

/* FAQ响应式布局 */
@media (max-width: 992px) {
    .zf4bfffaq-framework {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .zf4bfffaq-header {
        padding: 15px;
    }

    .zf4bfffaq-body {
        padding: 15px;
    }

    .zf4bfffaq-icon {
        font-size: 20px;
    }

    .zf4bfffaq-header h3 {
        font-size: 18px;
    }

    .zf4bfffaq-question {
        padding: 12px 15px;
    }

    .zf4bfffaq-answer {
        padding: 15px;
    }

    .zf4bffquestion-icon,
    .zf4bffanswer-icon {
        font-size: 18px;
    }

    .zf4bfffaq-question h4 {
        font-size: 15px;
    }

    .zf4bffanswer-content p {
        font-size: 13px;
    }

    .zf4bffanswer-steps li {
        font-size: 13px;
        padding: 8px 12px;
        padding-left: 25px;
    }
}

/* 页脚 */
.zf4bfffooter {
    background-color: #333;
    color: white;
    padding: 60px 0 20px;
}

.zf4bfffooter-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.zf4bfffooter-info h3 {
    margin-bottom: 20px;
    color: #fff;
}

.zf4bffcontact-info {
    margin-top: 20px;
    color: #ccc;
}

.zf4bfffooter-links h4,
.zf4bfffooter-news h4 {
    margin-bottom: 20px;
    color: #fff;
}

.zf4bfffooter-links ul,
.zf4bfffooter-news ul {
    list-style: none;
}

.zf4bfffooter-links a {
    color: #ccc;
    text-decoration: none;
    margin-bottom: 10px;
    display: block;
    transition: color 0.3s;
}

.zf4bfffooter-links a:hover {
    color: #fff;
}

.zf4bfffooter-news li {
    color: #ccc;
    margin-bottom: 10px;
}

.zf4bfffooter-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: #ccc;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .zf4bffcol-md-4 {
        flex: 0 0 50%;
        max-width: 50%;
        border-right: 1px solid #e0e0e0;
        border-bottom: 1px solid #e0e0e0;
    }

    .zf4bffcol-md-4:nth-child(2n) {
        border-right: none;
    }

    .zf4bffcol-md-4:nth-last-child(-n+2) {
        border-bottom: none;
    }
}

@media (max-width: 768px) {
    .zf4bffheader .zf4bffcontainer {
        flex-direction: column;
        height: auto;
        padding: 8px;
    }

    .zf4bffmain-nav ul {
        flex-direction: column;
        text-align: center;
        margin-top: 20px;
    }

    .zf4bffmain-nav li {
        margin: 10px 0;
    }

    .zf4bffhero {
        padding: 120px 0 60px;
    }

    .zf4bffhero-text h2 {
        font-size: 36px;
    }

    .zf4bffhero-text p {
        font-size: 18px;
    }

    .zf4bffhero-image {
        max-width: 300px;
    }

    .zf4bffhero-image img {
        width: 100vw;
        max-width: 100vw;
        height: auto;
        max-height: 50vw;
        display: block;
        margin: 0 auto;
    }

    .zf4bffbtn {
        display: block;
        margin: 10px auto;
        max-width: 200px;
    }

    .zf4bffsection-title {
        font-size: 28px;
    }

    .zf4bffsecurity-item,
    .zf4bffdownload-card,
    .zf4bffguide-item,
    .zf4bfffaq-item {
        padding: 20px;
    }

    .zf4bfffeature-box {
        padding: 20px;
    }

    .zf4bfffeature-icon {
        font-size: 36px;
    }

    .zf4bfffeature-header {
        padding: 20px 20px 10px;
    }

    .zf4bfffeature-body {
        padding: 15px 20px;
    }

    .zf4bfffeature-header h3 {
        font-size: 18px;
    }

    .zf4bfffeature-list li {
        padding: 10px 15px;
    }

    .zf4bfffeature-detail {
        padding-left: 15px;
    }

    .zf4bfffeature-footer {
        flex-direction: column;
        gap: 5px;
    }

    .zf4bfffeature-tag {
        width: 100%;
        text-align: center;
    }

    .zf4bffcol-md-4 {
        flex: 0 0 100%;
        max-width: 100%;
        border-right: none;
        border-bottom: 1px solid #e0e0e0;
    }

    .zf4bffcol-md-4:last-child {
        border-bottom: none;
    }
}

@media (max-width: 480px) {
    .zf4bffhero-text h2 {
        font-size: 28px;
    }

    .zf4bffhero-text p {
        font-size: 16px;
    }

    .zf4bffhero-image {
        max-width: 250px;
    }

    .zf4bffdownload-buttons {
        flex-direction: column;
        align-items: center;
    }

    .zf4bffbtn {
        width: 100%;
        max-width: 200px;
    }

    .zf4bffsection-title {
        font-size: 24px;
    }

    .zf4bfffeature-item,
    .zf4bffdownload-card,
    .zf4bffstep {
        padding: 20px;
    }

    .zf4bfffooter-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .zf4bfffooter-links ul,
    .zf4bfffooter-news ul {
        text-align: center;
    }
}

/* 响应式设计优化 */
@media (max-width: 1200px) {
    .zf4bffcontainer {
        max-width: 960px;
        padding: 0 15px;
    }

    .zf4bffhero-text h2 {
        font-size: 42px;
    }

    .zf4bffhero-image {
        max-width: 450px;
    }

    .zf4bfffeature-box,
    .zf4bffsecurity-box,
    .zf4bffdownload-box,
    .zf4bffguide-category,
    .zf4bfffaq-category {
        margin-bottom: 20px;
    }
}

@media (max-width: 992px) {
    .zf4bffcontainer {
        max-width: 720px;
    }

    /* 导航栏响应式 */
    .zf4bffheader .zf4bffcontainer {
        padding: 0 15px;
    }

    .zf4bffmain-nav ul {
        gap: 15px;
    }

    /* 英雄区域响应式 */
    .zf4bffhero-content {
        flex-direction: column;
        text-align: center;
        gap: 30px;
    }

    .zf4bffhero-text {
        max-width: 100%;
    }

    .zf4bffhero-text h2 {
        font-size: 36px;
    }

    .zf4bffhero-image {
        max-width: 400px;
        margin: 0 auto;
    }

    .zf4bffhero-image img {
        width: 100vw;
        max-width: 100vw;
        height: auto;
        max-height: 50vw;
        display: block;
        margin: 0 auto;
    }

    .zf4bffdownload-buttons {
        justify-content: center;
    }

    /* 特点部分响应式 */
    .zf4bffrow {
        margin: 0;
    }

    .zf4bffcol-md-4 {
        flex: 0 0 50%;
        max-width: 50%;
        padding: 10px;
    }

    /* 安全保障响应式 */
    .zf4bffsecurity-row {
        flex-wrap: wrap;
    }

    .zf4bffsecurity-col {
        flex: 0 0 50%;
        max-width: 50%;
        padding: 10px;
    }

    /* 下载中心响应式 */
    .zf4bffdownload-row {
        flex-direction: column;
    }

    .zf4bffdownload-col {
        flex: 0 0 100%;
        max-width: 100%;
        padding: 8px 0;
    }

    /* 使用指南响应式 */
    .zf4bffguide-steps {
        flex-direction: column;
    }

    .zf4bffstep-box {
        width: 100%;
    }

    /* FAQ响应式 */
    .zf4bfffaq-framework {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .zf4bffcontainer {
        max-width: 540px;
    }

    /* 导航栏响应式 */
    .zf4bffheader {
        position: relative;
    }

    .zf4bffheader .zf4bffcontainer {
        flex-direction: column;
        padding: 15px;
    }

    .zf4bfflogo h1 {
        font-size: 18px;
        margin-bottom: 4px;
    }

    .zf4bffmain-nav ul {
        flex-direction: column;
        text-align: center;
        gap: 10px;
    }

    .zf4bffmain-nav li {
        margin: 0;
    }

    /* 英雄区域响应式 */
    .zf4bffhero {
        padding: 120px 0 60px;
    }

    .zf4bffhero-text h2 {
        font-size: 32px;
    }

    .zf4bffhero-text p {
        font-size: 16px;
        margin-bottom: 30px;
    }

    .zf4bffhero-image {
        max-width: 300px;
    }

    .zf4bffhero-image img {
        width: 100vw;
        max-width: 100vw;
        height: auto;
        max-height: 50vw;
        display: block;
        margin: 0 auto;
    }

    /* 特点部分响应式 */
    .zf4bffcol-md-4 {
        flex: 0 0 100%;
        max-width: 100%;
    }

    .zf4bfffeature-box {
        margin-bottom: 15px;
    }

    /* 安全保障响应式 */
    .zf4bffsecurity-col {
        flex: 0 0 100%;
        max-width: 100%;
    }

    .zf4bffsecurity-box {
        margin-bottom: 15px;
    }

    /* 下载中心响应式 */
    .zf4bffdownload-info {
        grid-template-columns: 1fr;
    }

    .zf4bffdownload-box {
        margin-bottom: 15px;
    }

    /* 使用指南响应式 */
    .zf4bffguide-details {
        grid-template-columns: 1fr;
    }

    .zf4bffguide-category {
        margin-bottom: 15px;
    }

    /* FAQ响应式 */
    .zf4bfffaq-category {
        margin-bottom: 15px;
    }

    .zf4bfffaq-question h4 {
        font-size: 15px;
    }

    .zf4bfffaq-answer {
        padding: 15px;
    }
}

@media (max-width: 576px) {
    .zf4bffcontainer {
        padding: 0 10px;
    }

    /* 英雄区域响应式 */
    .zf4bffhero {
        padding: 100px 0 40px;
    }

    .zf4bffhero-text h2 {
        font-size: 28px;
    }

    .zf4bffhero-text p {
        font-size: 14px;
    }

    .zf4bffhero-image {
        max-width: 250px;
    }

    .zf4bffhero-image img {
        width: 100vw;
        max-width: 100vw;
        height: auto;
        max-height: 50vw;
        display: block;
        margin: 0 auto;
    }

    .zf4bffdownload-buttons {
        flex-direction: column;
        gap: 10px;
    }

    .zf4bffbtn {
        width: 100%;
        max-width: 200px;
        margin: 0 auto;
    }

    /* 特点部分响应式 */
    .zf4bffsection-title {
        font-size: 24px;
        margin-bottom: 30px;
    }

    .zf4bfffeature-header,
    .zf4bffsecurity-header,
    .zf4bffdownload-header,
    .zf4bffguide-header,
    .zf4bfffaq-header {
        padding: 15px;
    }

    .zf4bfffeature-body,
    .zf4bffsecurity-body,
    .zf4bffdownload-body,
    .zf4bffguide-body,
    .zf4bfffaq-body {
        padding: 15px;
    }

    /* 列表项响应式 */
    .zf4bfffeature-list li,
    .zf4bffsecurity-list li,
    .zf4bffdownload-list li,
    .zf4bffguide-list li,
    .zf4bfffaq-list li {
        padding: 10px 15px;
    }

    .zf4bfffeature-title,
    .zf4bffsecurity-title,
    .zf4bffdownload-title,
    .zf4bffguide-title,
    .zf4bfffaq-title {
        font-size: 14px;
    }

    .zf4bfffeature-detail,
    .zf4bffsecurity-detail,
    .zf4bffdownload-detail,
    .zf4bffguide-detail,
    .zf4bfffaq-detail {
        font-size: 12px;
    }

    /* 页脚响应式 */
    .zf4bfffooter-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 30px;
    }

    .zf4bfffooter-links ul,
    .zf4bfffooter-news ul {
        text-align: center;
    }
}

/* 打印样式优化 */
@media print {
    .zf4bffheader,
    .zf4bffhero,
    .zf4bffdownload-buttons,
    .zf4bfffooter {
        display: none;
    }

    .zf4bffcontainer {
        max-width: 100%;
        padding: 0;
    }

    body {
        font-size: 12pt;
        line-height: 1.5;
    }

    .zf4bffsection-title {
        font-size: 18pt;
        margin-bottom: 20pt;
    }

    .zf4bfffeature-box,
    .zf4bffsecurity-box,
    .zf4bffdownload-box,
    .zf4bffguide-category,
    .zf4bfffaq-category {
        break-inside: avoid;
        page-break-inside: avoid;
    }
}