#tab {
    display: flex;
    justify-content: space-around;
    font-size: 15px;
    color: #3d3a39;
    width: 100%;
    margin: 0 auto;
    background-color: #f6f6f4;
}

#tab .moused {
    cursor: pointer;
}

#tab .showed {
    color: #005a9c;
    padding-bottom: 10px;
    border-bottom: 4px solid #005a9c;
    background-color: #fff;
}

#tab li {
    display: block;
    flex: 1;
    text-align: center;
    padding-top: 10px;
    background-color: #f6f6f4;
    border: 1px solid #8c8c8c;
    border-left-width: 0;
}

#tab li:nth-child(1) {
    border-left: 1px solid #8c8c8c;
}


.container3 {
    padding-top: 23px;
}


@font-face {
    font-family: 'Source Han Sans CN';
    src: local('Source Han Sans CN Normal'), local('思源黑体 CN Normal');
    font-weight: 400;
    font-style: normal;
}

@font-face {
    font-family: 'Source Han Sans CN Bold';
    src: local('Source Han Sans CN Bold'), local('思源黑体 CN Bold');
    font-weight: 700;
    font-style: normal;
}

@font-face {
    font-family: 'Source Han Sans CN Heavy';
    src: local('Source Han Sans CN Heavy'), local('思源黑体 CN Heavy');
    font-weight: 800;
    font-style: normal;
}

@font-face {
    font-family: 'Source Han Sans CN';
    src: local('Source Han Sans CN Normal Italic'), local('思源黑体 CN Normal Italic');
    font-weight: 400;
    font-style: italic;
}

:root {
    --hrl-primary: #003580;
    --hrl-accent: #ff6b00;
    --hrl-text: #3d3a39;
    --hrl-bg-light: #fafafa;
    --hrl-border-color: #e0e0e0;
}

html {
    scroll-padding-top: 2rem;
    scroll-behavior: smooth;
}

body {
    font-family: "Source Han Sans CN", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: #3d3a39;
    margin: 0;
    background-color: #fff;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.hrl-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* --- FONT USAGE STANDARD (CORRECTED) --- */
h1 {
    font: 800 46px/56px "Source Han Sans CN Heavy", -apple-system, BlinkMacSystemFont, sans-serif;
    margin: 0 0 14px;
}

h2 {
    font: 700 20px/24px "Source Han Sans CN Bold", -apple-system, BlinkMacSystemFont, sans-serif;
    margin: 30px 0 8px 0;
}

h3 {
    font: 700 16px/20px "Source Han Sans CN Bold", -apple-system, BlinkMacSystemFont, sans-serif;
    margin: 20px 0 8px 0;
}

h4 {
    font: 700 16px "Source Han Sans CN Bold", -apple-system, BlinkMacSystemFont, sans-serif;
    margin: 20px 0 8px 0;
}

p {
    font: 400 15px "Source Han Sans CN", -apple-system, BlinkMacSystemFont, sans-serif;
    margin: 0 0 2px;
    line-height: 1.7;
}

em {
    font-style: italic;
    word-break: break-all;
}

.hrl-references li {
    font: 400 14px "Source Han Sans CN", -apple-system, BlinkMacSystemFont, sans-serif;
    font-style: italic;
    margin: 20px 0;
    /* 显示数字 */
    list-style: decimal; 
    
}

sup {
    font-size: 0.6em;
    vertical-align: super;
    line-height: 0;
}

/* --- UI LAYOUT --- */
.hrl-cover {
    padding: 4rem 1rem;
    border-radius: 8px;
    text-align: center;
    background-color: #1a2c48;
    color: #fff;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 1rem;
}

.hrl-cover .hrl-logo-main {
    font: 800 24px/1.2 "Source Han Sans CN Heavy", sans-serif;
}

.hrl-cover .hrl-logo-sub {
    font: 700 18px/1.2 "Source Han Sans CN Bold", sans-serif;
}

.hrl-cover h1 {
    color: #fff;
}

.hrl-cover .hrl-organizer {
    margin-top: 2rem;
    font: 400 11px/20px "Source Han Sans CN", sans-serif;
    opacity: 0.8;
}

.hrl-cover .hrl-organizer span {
    display: block;
}

.hrl-section-divider {
    padding: 0;
    text-align: center;
    color: #fff;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    gap: 1rem;
}

.img-cover{
    width: 100%;
    margin: 20px 0;
}

#part2 .img-cover, #part1 .img-cover{
    margin: 0;
}

.cover{
    font: 800 40px/48px "Source Han Sans CN Heavy", -apple-system, BlinkMacSystemFont, sans-serif;
    width: 100%;
}

nav.hrl-toc {
    border-left: 4px solid #3d3a39;
    padding-left: 1rem;
    margin: 2rem 0;
    overflow-wrap: anywhere;
}

nav.hrl-toc ol {
    list-style: none;
    margin: 0;
    padding: 0;
    counter-reset: toc;
}

nav.hrl-toc li {
    margin: .35rem 0;
}

nav.hrl-toc li::before {
    counter-increment: toc;
    content: counters(toc, ".") ". ";
    font-weight: 600;
    color: #3d3a39;
    font-size: 16px;
}

nav.hrl-toc ol ol {
    margin-left: 1.25rem;
}

nav.hrl-toc a {
    text-decoration: none;
    color: var(--hrl-text);
    font: 400 16px "Source Han Sans CN", sans-serif;
}

nav.hrl-toc a:hover {
    color: #003580;
}

.hrl-table-wrapper {
    overflow-x: auto;
    width: 100%;
    margin-top: 1rem;
}

table.hrl-table {
    width: 100%;
    border-collapse: collapse;
}

.hrl-table th,
.hrl-table td {
    border: 1px solid var(--hrl-border-color);
    padding: 0.75rem;
    text-align: left;
    vertical-align: top;
    font: 400 14px "Source Han Sans CN", sans-serif;
}

.hrl-table thead th {
    background-color: var(--hrl-bg-light);
    font-family: "Source Han Sans CN Bold", sans-serif;
    font-weight: 700;
}

.hrl-table tbody tr:nth-child(even) {
    background-color: var(--hrl-bg-light);
}



.hrl-table ul {
    margin: 0;
    padding-left: 0;
}

.hrl-table ul li {
    padding-left: 0.5rem;
    margin-bottom: 0.5rem;
}

.hrl-references {
    list-style-position: inside;
    padding-left: 15px;
}

.hrl-org-info {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    align-items: flex-start;
}

.hrl-org-logo-placeholder {
    flex-shrink: 0;
    width: 120px;
    height: 60px;
    background-color: var(--hrl-bg-light);
    border: 1px solid var(--hrl-border-color);
    display: flex;
    justify-content: center;
    align-items: center;
    font: 700 14px/1 "Source Han Sans CN Bold", sans-serif;
    color: #aaa;
}

.hrl-org-text {
    flex: 1;
    min-width: 300px;
}

footer {
    border-top: 1px solid var(--hrl-border-color);
    padding-top: 2rem;
}

footer .hrl-contact-info p {
    margin-bottom: 1rem;
}

.hrl-qr-codes {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    justify-content: center;
    margin-top: 2rem;
}

.hrl-qr-codes figure {
    margin: 0;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.hrl-qr-placeholder {
    width: 120px;
    height: 120px;
    background-color: var(--hrl-bg-light);
    border: 1px solid var(--hrl-border-color);
    display: flex;
    justify-content: center;
    align-items: center;
    font: 700 12px/1 "Source Han Sans CN Bold", sans-serif;
    color: #aaa;
}

.hrl-qr-codes figcaption {
    font: 400 11px/20px "Source Han Sans CN", sans-serif;
}

#part1-1,#part1-2{
    margin: 40px 0 8px 0;
}

#part2{
    margin: 32px 0;
}

.hrl-table th{
    background-color: #51535F !important;
    color: #fff;
}

.hrl-table tr td:nth-child(1){
    font-weight: bold !important;
}

.hrl-table-section-header th {
    background-color: #FEFEFE !important;
    color: #3d3a39;
    font: 700 16px/20px "Source Han Sans CN Bold", sans-serif;
    padding: 0.5rem;
}

.hrl-page-logo{
    display: flex;
    justify-content: flex-end;
    align-items: center;
    margin-bottom: 16px;
}

.hrl-page-logo img{
    width: 150px;
}

.mb-2{
    margin-bottom: 8px;
}

.disc{
    padding-left: 30px;
}
.disc li{
    list-style: disc;
    line-height: 1.7;
}

strong{
    font-weight: bold;
}

.gotoHeader {
    position: fixed;
    right: 30px;
    bottom: 100px;
    z-index: 2;
}

.toheader_box{
    position: relative;
    width: 40px;
    height: 40px;
    cursor: pointer;
    padding: 10px 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 50%;
    background-color: #0999D6;
}

#backToTop .icon{
    filter: brightness(0) invert(1);
}


@media (max-width: 768px) {
    h1 {
        font-size: 32px;
        line-height: 40px;
    }

    h2 {
        font-size: 18px;
        line-height: 22px;
    }

    h3 {
        font-size: 15px;
        line-height: 19px;
    }

    .hrl-cover {
        padding: 2rem 1rem;
    }

    .hrl-cover h1 {
        font-size: 2.5rem;
    }

    .hrl-section-divider div {
        font-size: 32px;
        line-height: 40px;
    }

    #tab .moused{
        font-size: 13px;
    }
}