* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Helvetica, Arial, sans-serif;
    background: #f5f7fb;
    color: #1f2d3d;
    line-height: 1.5;
    font-size: 16px;
}
a {
    text-decoration: none;
    color: #2c6e9e;
    transition: color 0.2s ease;
}
a:hover {
    color: #e36209;
}
img {
    border: 0;
    max-width: 100%;
    vertical-align: middle;
}
.cl {
    clear: both;
}
/* ---------- HEADER ---------- */
#head {
    background: #ffffff;
    box-shadow: 0 1px 4px rgba(0,0,0,0.05), 0 2px 8px rgba(0,0,0,0.02);
    padding: 16px 24px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    position: relative;
    z-index: 10;
}
.s_form .logo img {
    height: 42px;
    width: auto;
    display: block;
}
.s_link {
    display: flex;
    align-items: center;
    gap: 20px;
}
.s_link a {
    font-size: 16px;
    font-weight: 500;
    background: #f0f2f5;
    padding: 8px 18px;
    border-radius: 30px;
    color: #2c3e50;
    transition: all 0.2s;
}
.s_link a:hover {
    background: #e2e6ea;
    color: #e36209;
}
.ErrorPage-goBackButton {
    cursor: pointer;
    background: #f0f2f5;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}
.ErrorPage-goBackButton:hover {
    background: #e2e6ea;
}
.ErrorPage-goBackButton img {
    width: 20px;
    height: 20px;
    opacity: 0.7;
}
/* ---------- MAIN LAYOUT ---------- */
#main {
    max-width: 1400px;
    margin: 0 auto;
    padding: 32px 24px 48px;
}
#content {
    background: transparent;
}
/* 分组标题 */
h3 {
    font-size: 1.8rem;
    font-weight: 600;
    margin: 40px 0 20px 0;
    padding-bottom: 12px;
    border-bottom: 3px solid #dce5ef;
    position: relative;
    color: #1e466e;
}
h3:first-of-type {
    margin-top: 0;
}
h3.new sup {
    background: #f97316;
    font-size: 0.75rem;
    padding: 2px 8px;
    border-radius: 20px;
    color: white;
    margin-left: 12px;
    font-weight: normal;
    letter-spacing: 0.5px;
}
/* 卡片网格 - 兼容IE8+, 同时支持现代响应式 */
.grid-nav {
    display: block;
    margin: 0 -12px;
    overflow: hidden;
}
.grid-nav:before,
.grid-nav:after {
    content: "";
    display: table;
    clear: both;
}
.nav-card {
    float: left;
    width: 25%;
    padding: 0 12px;
    margin-bottom: 24px;
}
/* 卡片内部样式 */
.card-inner {
    background: #ffffff;
    border-radius: 20px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
    padding: 20px 16px;
    transition: all 0.25s ease;
    border: 1px solid #eef2f6;
    height: 100%;
}
.card-inner:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 24px -8px rgba(0, 0, 0, 0.12);
    border-color: #cbdde9;
}
.nav-card a {
    font-size: 1.2rem;
    font-weight: 600;
    display: inline-block;
    margin-bottom: 8px;
    color: #1f6392;
}
.nav-card a:hover {
    color: #e36209;
}
.nav-card span {
    font-size: 0.85rem;
    color: #5a6e7c;
    line-height: 1.4;
    display: block;
}
/* 响应式：平板 2列，手机 1列 */
@media screen and (max-width: 992px) {
    .nav-card {
        width: 33.333%;
    }
}
@media screen and (max-width: 768px) {
    h1#s_fm.s_form{display:none}
    .nav-card {
        width: 50%;
    }
    #head {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
    .s_link {
        justify-content: center;
    }
    h3 {
        font-size: 1.5rem;
    }
}
@media screen and (max-width: 480px) {
    .nav-card {
        width: 100%;
    }
    #main {
        padding: 20px 16px;
    }
    .card-inner {
        padding: 16px;
    }
}
/* 针对IE8 固定为3列或2列降级 (媒体查询不支持, 使用默认25%宽) */
/* IE8 单独处理，不使用flex，保留浮动布局即可，保证可读 */
.ie8-fallback .nav-card {
    width: 33.33%;
}
/* 底部footer */
.footer {
    text-align: center;
    padding: 32px 20px 24px;
    margin-top: 48px;
    border-top: 1px solid #e2e8f0;
    color: #6c7a89;
    font-size: 0.85rem;
    background: #ffffff;
    border-radius: 30px 30px 0 0;
}
/* 辅助清除浮动 */
.clearfix {
    zoom: 1;
}
.clearfix:after {
    content: ".";
    display: block;
    height: 0;
    clear: both;
    visibility: hidden;
}
@media (min-width:741px) {
.no-pc1,.ErrorPage-goBackButton{display:none}
}