.wrapper {
    width: 90%;
    margin: 0 auto;
    box-sizing: border-box;
}

/* header */

.header {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 5% 0 2%;
    gap: 20px;
    background-color: #2D6B7D;
}

.header .logo {
    display: flex;
    flex: 1 1 auto;
    max-width: 55%;
    min-width: 0;
    align-items: center;
    margin: 0;
    border-radius: 20px;
    font-size: 120%;
    font-weight: 700;
}

.header .logo img {
    height: 80px;
    width: auto;
    object-fit: contain;
    display: block;
}

.header .logo .title {
    margin-left: 2%;
    width: auto;
    display: flex;
    flex-direction: row;
    align-items: baseline;
    gap: 8px;
    flex-wrap: wrap;
    overflow: hidden;
}

.header .logo .title h3 {
    font-size: 110%;
    color: white;
    font-weight: 600;
    margin: 0;
    white-space: normal;
    line-height: 1.2;
}

.header .logo .title p {
    font-size: 80%;
    color: white;
    margin: 0;
    white-space: normal;
    line-height: 1.2;
}

.header .nev { 
    flex: 0 1 auto;
    height: 100%;
    min-width: 0;
}

.header .nev .nev-child-1 {
    display: flex;
    width: 100%;
    height: 100%;
    justify-content: flex-end;
    align-items: center;
}

.header .nev-child-1 li {
    padding: 1% 2%;
    border-radius: 10px;
    position: relative;
    list-style: none;
}

/* 鼠标悬停导航栏 */
.header li:hover a {
    color: black;
}
.header .icon-jiantou_shang {
    display: none;
}
.header li:hover .icon-jiantou_xia {
    display: none;
}
.header li:hover .icon-jiantou_shang {
    display: inline-block;
}

/* 箭头图标对齐样式 */
.header .icon-jiantou_xia,
.header .icon-jiantou_shang {
    font-size: 12px;
    vertical-align: middle;
    line-height: 1;
    margin-left: 4px;
}

.header a {
    font-size: 150%;
    font-weight: 700;
    color: white;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.header .nev-child-2 {
    display: none;
    position: absolute;
    top: 70%;
    left: 50%;
    transform: translateX(-50%) translateY(-10px);
    background: linear-gradient(135deg, #ffffff 0%, #f8fbfc 100%);
    border-radius: 12px;
    box-shadow: 0 12px 35px rgba(46, 90, 97, 0.2);
    border: 1px solid rgba(46, 90, 97, 0.08);
    overflow: hidden;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    margin-top: 8px;
    min-width: 200px;
}

/* 下拉菜单顶部小箭头 */
.header .nev-child-2::before {
    content: '';
    position: absolute;
    top: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-bottom: 8px solid #ffffff;
    filter: drop-shadow(0 -2px 4px rgba(46, 90, 97, 0.1));
}

.header .nev-child-2 li {
    width: 100%;
    background-color: transparent;
    text-align: left;
    border-bottom: 1px solid rgba(46, 90, 97, 0.08);
    font-weight: 400;
    transition: all 0.2s ease;
}

.header .nev-child-2 li:nth-last-child(1) {
    border-bottom: none;
}

.header .nev-child-2 li a {
    display: flex;
    align-items: center;
    padding: 14px 10px;
    color: #2E5A61;
    text-decoration: none;
    font-size: 100%;
    font-weight: 500;
    position: relative;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.header .nev-child-2 li a:before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 0;
    z-index: -1;
}

.header .nev-child-2 li:hover {
    background-color: rgba(71, 183, 190, 0.05);
    transform: translateX(3px);
}

.header .nev-child-2 li:hover a {
    color: #2E5A61;
}

.header .nev-child-2 li:hover a:before {
    width: 4px;
}


/* 每个菜单项的特色样式 */
.header .nev-child-2 li:nth-child(1):hover {
    background: linear-gradient(90deg, rgba(255, 193, 7, 0.1), transparent);
}

.header .nev-child-2 li:nth-child(2):hover {
    background: linear-gradient(90deg, rgba(220, 53, 69, 0.1), transparent);
}

.header .nev-child-2 li:nth-child(3):hover {
    background: linear-gradient(90deg, rgba(255, 87, 34, 0.1), transparent);
}

.header .nev-child-2 li:nth-child(4):hover {
    background: linear-gradient(90deg, rgba(76, 175, 80, 0.1), transparent);
}

.header .nev-child-2 li:nth-child(5):hover {
    background: linear-gradient(90deg, rgba(156, 39, 176, 0.1), transparent);
}

/* 菜单项动画序列 */
.header li:hover .nev-child-2 li {
    animation: slideInFromLeft 0.3s ease forwards;
    opacity: 0;
    transform: translateX(-20px);
}

.header li:hover .nev-child-2 li:nth-child(1) { animation-delay: 0.1s; }
.header li:hover .nev-child-2 li:nth-child(2) { animation-delay: 0.15s; }
.header li:hover .nev-child-2 li:nth-child(3) { animation-delay: 0.2s; }
.header li:hover .nev-child-2 li:nth-child(4) { animation-delay: 0.25s; }
.header li:hover .nev-child-2 li:nth-child(5) { animation-delay: 0.3s; }

@keyframes slideInFromLeft {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* 下拉菜单显示动画 */
.header li:hover .nev-child-2 {
    display: block;
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.content {
    background-color: #eff5ff;
    padding: 20px 0;
    width: 100%;
}


/* 页面标题区域 */
.download-header {
    text-align: center;
    padding: 60px 0 40px 0;
    background: linear-gradient(135deg, #f8fbfc 0%, #ffffff 100%);
    margin-bottom: 40px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(46, 90, 97, 0.1);
}

.page-title {
    font-size: 2.5em;
    color: #2E5A61;
    margin-bottom: 16px;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(46, 90, 97, 0.1);
}

.page-subtitle {
    font-size: 1.2em;
    color: #666;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

/* 下载统计区域 */
.download-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    margin-bottom: 50px;
    padding: 30px;
    background: linear-gradient(135deg, #2E5A61 0%, #47b7be 100%);
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(46, 90, 97, 0.2);
}

.stat-item {
    text-align: center;
    color: white;
}

.stat-number {
    font-size: 2.2em;
    font-weight: 700;
    margin-bottom: 8px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.stat-label {
    font-size: 1em;
    opacity: 0.9;
    font-weight: 500;
}

/* 下载卡片容器 */
.download-container {
    padding: 20px 0;
    background-color: #fff;
    border-radius: 8px;
    border: 1px solid rgba(46, 90, 97, 0.1);
}

/* 下载卡片 */
.download-card {
    padding: 15px 15%;
    position: relative;
    margin: 20px 0;
}

/* 卡片图标 */
.card-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #47b7be, #2E5A61);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    box-shadow: 0 4px 15px rgba(71, 183, 190, 0.3);
}

.card-title {
    font-size: 1.4em;
    color: #2E5A61;
    margin-bottom: 12px;
    font-weight: 600;
    line-height: 1.3;
}

.card-description {
    color: #666;
    line-height: 1.6;
    margin-bottom: 20px;
}

.card-info {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 6px;
    color: #888;
    background: rgba(46, 90, 97, 0.05);
    padding: 6px 12px;
    border-radius: 20px;
}

.info-item i {
    font-size: 12px;
    color: #47b7be;
}

.card-content {
    width: 75%;
}

/* 下载按钮 */
.card-actions {
    text-align: center;
    position: absolute;
    right: 18%;
    top: 10%;
}

.download-btn {
    background: linear-gradient(135deg, #47b7be 0%, #2E5A61 100%);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 25px;
    font-weight: 600;
    font-size: 110%;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(71, 183, 190, 0.4);
    background: linear-gradient(135deg, #2E5A61 0%, #47b7be 100%);
}

.download-btn:active {
    transform: translateY(0);
}

.category-select {
    padding: 12px 16px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 14px;
    background: white;
    color: #333;
    cursor: pointer;
    transition: all 0.3s ease;
    outline: none;
}

.category-select:focus {
    border-color: #47b7be;
    box-shadow: 0 0 0 3px rgba(71, 183, 190, 0.1);
}

.category-select:hover {
    border-color: #47b7be;
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .download-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }
}

@media (max-width: 1024px) {
    .download-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .category-selector {
        gap: 12px;
    }
}

@media (max-width: 768px) {
    .download-grid {
        gap: 20px;
    }
    
    .download-card {
        padding: 25px 20px;
    }
    
    .category-selector {
        gap: 10px;
    }
    
    .select-group label {
        font-size: 13px;
    }
    
    .category-select {
        padding: 10px 12px;
        font-size: 13px;
    }
    
    /* .download-btn.primary {
        padding: 12px 25px;
        font-size: 14px;
    } */
    
    /* .download-btn.secondary {
        padding: 10px 20px;
        font-size: 13px;
    } */
}

/* 使用说明区域 */
.usage-info {
    background: linear-gradient(135deg, #f8fbfc 0%, #ffffff 100%);
    padding: 50px 40px;
    border-radius: 16px;
    box-shadow: 0 4px 15px rgba(46, 90, 97, 0.1);
    border: 1px solid rgba(46, 90, 97, 0.08);
}

.section-title {
    text-align: center;
    font-size: 2em;
    color: #2E5A61;
    margin-bottom: 40px;
    font-weight: 600;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.info-card {
    text-align: center;
    padding: 30px 20px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(46, 90, 97, 0.08);
    transition: all 0.3s ease;
}

.info-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(46, 90, 97, 0.15);
}

.info-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #47b7be, #2E5A61);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px auto;
    box-shadow: 0 4px 15px rgba(71, 183, 190, 0.3);
}

.info-icon i {
    font-size: 22px;
    color: white;
}

.info-card h3 {
    font-size: 1.2em;
    color: #2E5A61;
    margin-bottom: 15px;
    font-weight: 600;
}

.info-card p {
    color: #666;
    line-height: 1.6;
    font-size: 14px;
}

/* 下载提示 Toast */
.download-toast {
    position: fixed;
    top: 20px;
    right: 20px;
    background: linear-gradient(135deg, #47b7be, #2E5A61);
    color: white;
    padding: 15px 25px;
    border-radius: 8px;
    box-shadow: 0 8px 25px rgba(71, 183, 190, 0.3);
    display: flex;
    align-items: center;
    gap: 10px;
    z-index: 10000;
    transform: translateX(100%);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.download-toast.show {
    transform: translateX(0);
    opacity: 1;
}

.download-toast i {
    font-size: 18px;
}


/* copyright */
.copyright {
    width: 100%;
    margin: 0 auto;
    margin-bottom: 20px;
}

.copyright .bottom {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    margin: 0 auto;
    padding-top: 40px;
    padding-bottom: 40px;
    background-color: #1E3A4A;
}

.copyright .bottom p {
    margin: 0 20px;
    color: white;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .download-header {
        padding: 40px 20px 30px 20px;
        margin-bottom: 30px;
    }
    
    .page-title {
        font-size: 2em;
    }
    
    .page-subtitle {
        font-size: 1.1em;
        padding: 0 20px;
    }
    
    .download-stats {
        flex-direction: column;
        gap: 20px;
        padding: 25px 20px;
        margin-bottom: 30px;
    }
    
    .download-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .download-card {
        padding: 25px 20px;
    }
    
    .card-info {
        flex-direction: column;
        gap: 10px;
    }
    
    .info-item {
        justify-content: center;
    }
    
    .usage-info {
        padding: 40px 20px;
    }
    
    .section-title {
        font-size: 1.6em;
        margin-bottom: 30px;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .download-toast {
        right: 10px;
        left: 10px;
        transform: translateY(-100%);
    }
    
    .download-toast.show {
        transform: translateY(0);
    }
}

@media (max-width: 480px) {
    .download-stats {
        gap: 15px;
        padding: 20px 15px;
    }
    
    .stat-number {
        font-size: 1.8em;
    }
    
    .download-card {
        padding: 20px 15px;
    }
    
    .card-title {
        font-size: 1.2em;
    }
    
    .download-btn {
        padding: 10px 25px;
        font-size: 13px;
    }
}

/* 加载动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Header响应式设计 */

/* 1550px及以下 - 防止logo和nav重叠 */
@media (max-width: 1550px) {
    .header {
        padding: 0.5% 1.5%;
        gap: 15px;
    }
    
    .header .logo {
        max-width: 50%;
    }
    
    .header .logo img {
        height: 75px;
    }
    
    .header .logo .title {
        margin-left: 1.5%;
    }
    
    .header .logo .title h3 {
        font-size: 105%;
    }
    
    .header .logo .title p {
        font-size: 75%;
    }
    
    .header .nev-child-1 {
        gap: 12px;
    }
    
    .header .nev-child-1 li {
        padding: 1% 1.5%;
    }
    
    .header a {
        font-size: 130%;
    }
}

/* 1350px及以下 - 进一步优化空间 */
@media (max-width: 1350px) {
    .header .logo {
        max-width: 48%;
    }
    
    .header .logo img {
        height: 70px;
    }
    
    .header .logo .title h3 {
        font-size: 100%;
    }
    
    .header .logo .title p {
        font-size: 70%;
    }
    
    .header .nev-child-1 {
        gap: 10px;
    }
    
    .header a {
        font-size: 120%;
    }
}

/* 1200px及以下 */
@media (max-width: 1200px) {
    .header {
        padding: 1% 2%;
        flex-wrap: wrap;
        gap: 15px;
    }
    
    .header .logo {
        max-width: 45%;
    }
    
    .header .logo img {
        height: 65px;
    }
    
    .header .logo .title {
        margin-left: 10px;
    }
    
    .header .logo .title h3 {
        font-size: 95%;
    }
    
    .header .logo .title p {
        font-size: 68%;
    }
    
    .header .nev-child-1 {
        gap: 8px;
    }
    
    .header .nev-child-1 li {
        padding: 1% 1.2%;
    }
    
    .header a {
        font-size: 110%;
    }
    
    /* 调整下拉菜单定位 */
    .header .nav-tools .tools-dropdown,
    .header .nav-help .help-dropdown {
        left: 50%;
    }
}

@media (max-width: 992px) {
    .header {
        flex-direction: column;
        align-items: center;
        gap: 15px;
        padding: 1.5% 2%;
    }
    
    .header .logo {
        max-width: 90%;
        justify-content: center;
    }
    
    .header .nev {
        width: 100%;
    }
    
    .header .nev-child-1 {
        justify-content: center;
        flex-wrap: wrap;
        gap: 12px;
    }
}

@media (max-width: 768px) {
    .header {
        padding: 2% 1.5%;
    }
    
    .header .logo {
        max-width: 100%;
    }
    
    .header .logo img {
        height: 60px;
    }
    
    .header .logo .title h3 {
        font-size: 90%;
    }
    
    .header .logo .title p {
        font-size: 70%;
    }
    
    .header .nev-child-1 li {
        padding: 8px 15px;
    }
    
    .header a {
        font-size: 110%;
    }
}

@media (max-width: 480px) {
    .header .logo img {
        height: 50px;
    }
    
    .header .logo .title h3 {
        font-size: 85%;
    }
    
    .header .logo .title p {
        display: none;
    }
    
    .header .nev-child-1 {
        gap: 8px;
    }
    
    .header .nev-child-1 li {
        padding: 6px 10px;
    }
    
    .header a {
        font-size: 100%;
    }
}