/* ========== 动画关键帧 ========== */
@keyframes fadeInUp {
from {
opacity: 0;
transform: translateY(30px);
}
to {
opacity: 1;
transform: translateY(0);
}
}
@keyframes fadeIn {
from {
opacity: 0;
}
to {
opacity: 1;
}
}
/* 卡片默认动画 */
.card {
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.1s;
}
.main-nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 10px 0;
}
.main-nav > ul {
    display: flex;
    flex-wrap: wrap;
    gap: 25px;
    justify-content: center;
    position: relative;
}
.main-nav a {
    color: white;
    font-size: 24px;
    font-weight: 700;
    transition: color 0.3s, transform 0.3s;
    display: block;
    padding: 8px 0;
}
.main-nav a:hover {
    color: #80bfff;
    transform: translateY(-2px);
}
/* 二级菜单 */
.main-nav ul li {
    position: relative;
}
.main-nav ul li ul {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 160px;
    background: #0a4ea0;
    border-radius: 6px;
    padding: 8px 0;
    box-shadow: 0 3px 8px rgba(0,0,0,0.2);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s;
    z-index: 999;
}
.main-nav ul li ul li {
    padding: 0 12px;
}
.main-nav ul li ul li a {
    font-size: 16px;
    padding: 6px 0;
    white-space: nowrap;
}
.main-nav ul li ul li ul {
    top: 0;
    left: 100%;
    transform: translateX(10px);
}
.main-nav ul li:hover > ul {
    opacity: 1;
    visibility: visible;
    transform: translate(0);
}
/* 内容布局 */
.container {
    max-width: 1600px;
    margin: 20px auto;
    padding: 0 20px;
    width: 100%;
}
.row {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 20px;
    width: 100%;
    align-items: stretch;
}
/* 侧边导航栏 */
.col-sidebar {
    flex: 0 0 280px;
    min-width: 280px;
    display: flex;
    flex-direction: column;
}
/* 文章列表区域 */
.col-article {
    flex: 1;
    min-width: 300px;
    display: flex;
    flex-direction: column;
}
.card {
    background: white;
    border-radius: 16px;
    padding: 7px 18px 18px 18px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    border: 6px solid #cce7ff;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    width: 100%;
    min-height: 0;
}
.card:hover {
    box-shadow: 0 8px 16px rgba(0,0,0,0.15);
    transform: translateY(-3px);
}
.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 15px;
    padding-bottom: 8px;
    border-bottom: 2px solid #6293d6;
}
.card-header h3 {
    font-size: 24px;
    color: #40649b;
}
.snow-icon img {
    height: 30px;
    vertical-align: middle;
    max-width: 100%;
}
/* ==================== 侧边菜单样式 ==================== */
.side-menu {
    width: 100%;
}
.side-menu > li {
    margin-bottom: 8px;
}
.side-menu a {
    display: flex;
    align-items: center;
    padding: 12px 15px;
    font-size: 16px;
    color: #333;
    border-radius: 8px;
    cursor: pointer;
}
.side-menu a:hover {
    background-color: #e6f2ff;
    color: #0a4ea0;
    padding-left: 20px;
}
/* 菜单选中样式 */
.side-menu a.selected {
    background-color: #0a4ea0;
    color: #fff;
    font-weight: bold;
}
/* 二级菜单 */
.side-menu li ul {
    margin: 5px 0 5px 15px;
    display: none;
}
.side-menu li ul.show {
    display: block;
}
.side-menu li ul a {
    padding: 10px 15px;
    font-size: 15px;
}
/* 三级菜单 */
.side-menu li ul ul {
    margin: 5px 0 5px 15px;
}
.side-menu li ul ul a {
    padding: 8px 15px;
    font-size: 14px;
}
/* ==================== 文章列表样式 ==================== */
.article-list {
    width: 100%;
}
.article-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 10px;
    border-bottom: 1px dashed #cce7ff;
    cursor: pointer;
}
.article-item:last-child {
    border-bottom: none;
}
.article-item:hover {
    background-color: #f5f9ff;
    padding-left: 8px;
}
/* 文章标题：单行超出省略 */
.article-title {
    flex: 1;
    font-size: 16px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    padding-right: 20px;
}
.article-item:hover .article-title {
    color: #0a4ea0;
}
/* 文章日期 */
.article-date {
    color: #666;
    font-size: 14px;
    flex-shrink: 0;
}
/* ==================== 响应式适配 ==================== */
@media (max-width: 1200px) {
.main-nav a {
    font-size: 20px;
}
.main-nav > ul {
    gap: 18px;
}
}

@media (max-width: 992px) {
.top-bar {
    padding: 20px 0;
    justify-content: center;
    gap: 15px;
}
.main-nav a {
    font-size: 18px;
}
}

@media (max-width: 768px) {
.main-nav > ul {
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    background: rgba(10,78,160,0.95);
    padding: 20px;
    border-radius: 12px;
    width: 100%;
}
.main-nav > ul.show {
    display: flex;
}
.main-nav a {
    font-size: 18px;
}
.main-nav ul li ul {
    position: static;
    background: rgba(255,255,255,0.1);
    border-radius: 8px;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    text-align: center;
    width: 220px;
    margin: 8px 0;
    padding: 10px 0;
    display: none;
}
.main-nav ul li ul.show {
    display: block;
}
.main-nav ul li ul li a {
    font-size: 16px;
    color: #ffffff;
    padding: 6px 12px;
}
.main-nav ul li ul li a:hover {
    color: #80bfff;
}
.container {
    margin: 10px auto 0 auto;
}
.row {
    margin-bottom: 10px;
    gap: 15px;
}
.card {
    padding: 7px 12px 12px 12px;
    border-width: 4px;
}
.card-header h3 {
    font-size: 20px;
}
/* 移动端侧边栏全屏 */
.col-sidebar {
    flex: 0 0 100%;
    min-width: auto;
}
}

@media (max-width: 480px) {

}