/* 通用Header和Footer样式 */

/* 顶部极简导航 */
.ppt-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    padding: 30px 60px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    background: rgba(255, 255, 255, 1);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

.ppt-logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.ppt-logo img {
    height: 40px;
    width: auto;
}

.ppt-logo .heyi-logo {
    height: 40px;
}

.ppt-logo .client-logo {
    height: 40px;
    width: auto;
    min-width: 120px;
    object-fit: contain;
}

.ppt-logo-text {
    font-size: 22px;
    font-weight: 600;
    letter-spacing: 1px;
    background: linear-gradient(90deg, #2c3e50 0%, #4a9eff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.ppt-nav {
    display: flex;
    gap: 25px;
    align-items: center;
}

.ppt-nav-link {
    color: #2c3e50;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s;
    position: relative;
}

.ppt-nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: #4a9eff;
    transition: width 0.3s;
}

.ppt-nav-link:hover {
    color: #4a9eff;
}

.ppt-nav-link:hover::after {
    width: 100%;
}

/* 当前页面高亮 */
.ppt-nav-link.active {
    color: #4a9eff;
}

.ppt-nav-link.active::after {
    width: 100%;
}

/* 页脚 */
.ppt-footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 1);
    backdrop-filter: blur(10px);
    padding: 30px 60px;
    text-align: center;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
    box-shadow: 0 -2px 20px rgba(0, 0, 0, 0.08);
    z-index: 1000;
}

.ppt-footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.ppt-footer-left {
    display: flex;
    align-items: center;
    gap: 15px;
}

.ppt-footer-links {
    display: flex;
    gap: 30px;
    align-items: center;
}

.ppt-footer-link {
    color: #666;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s;
}

.ppt-footer-link:hover {
    color: #4a9eff;
}

.ppt-copyright {
    color: #999;
    font-size: 13px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .ppt-header, .ppt-footer {
        padding-left: 30px;
        padding-right: 30px;
    }
    
    .ppt-nav {
        display: none;
    }
    
    .ppt-footer-content {
        flex-direction: column;
        gap: 20px;
    }
}

/* 添加顶部和底部间距以避免被header和footer遮挡 */
body {
    padding-top: 100px;
    padding-bottom: 150px;
}