:root {
    --paper: #fff;
    --ink: #202b3b;
    --muted: #657284;
    --line: #e8edf3;
    --accent: #225cc8;
    --wash: #f6f8fb;
    --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", SimSun, serif;
    --sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
}
* {
    box-sizing: border-box;
}
html {
    scroll-behavior: smooth;
}
body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: var(--sans);
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}
a {
    color: inherit;
    text-decoration: none;
}
button,
input {
    font: inherit;
}
button,
a {
    touch-action: manipulation;
}
button {
    cursor: pointer;
}
a:focus-visible,
button:focus-visible,
input:focus-visible,
summary:focus-visible {
    outline: 3px solid #9bbaf5;
    outline-offset: 4px;
}
a:hover {
    color: var(--accent);
}
.site-shell {
    width: min(1180px, calc(100% - 80px));
    margin: 0 auto;
}
.site-header {
    border-bottom: 1px solid var(--line);
    background: #fff;
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    min-height: 92px;
}
.site-brand {
    display: inline-flex;
    gap: 12px;
    align-items: center;
    font-size: 21px;
    font-weight: 650;
    letter-spacing: 0.02em;
}
.brand-symbol {
    display: block;
    width: 21px;
    height: 27px;
    border: 2px solid var(--accent);
    border-radius: 2px;
    background:
        linear-gradient(var(--accent), var(--accent)) 5px 7px/9px 2px no-repeat,
        linear-gradient(var(--accent), var(--accent)) 5px 13px/9px 2px no-repeat;
}
.site-nav {
    display: flex;
    gap: 28px;
    align-items: center;
    flex-wrap: wrap;
}
.site-nav a {
    padding: 14px 0;
    font-size: 14px;
    color: #46556a;
}
.site-nav a:hover {
    color: var(--accent);
}
.article-index {
    padding-top: 64px;
    min-height: 65vh;
}
.index-heading {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 32px;
    padding-bottom: 38px;
}
.index-heading h1 {
    font-size: 44px;
    line-height: 1.25;
    font-weight: 600;
    letter-spacing: -0.035em;
    margin: 0 0 16px;
}
.index-heading p {
    color: var(--muted);
    font-size: 15px;
    line-height: 1.9;
    margin: 0;
    max-width: 530px;
}
.article-search {
    display: flex;
    flex: 0 1 350px;
    border: 1px solid #dce3ed;
    border-radius: 6px;
    min-height: 48px;
    overflow: hidden;
}
.article-search input {
    padding: 12px 14px;
    min-width: 0;
    width: 100%;
    border: 0;
    outline-offset: -4px;
    background: #fff;
    font-size: 14px;
}
.article-search button {
    border: 0;
    background: #f3f6fb;
    color: var(--accent);
    font-size: 14px;
    font-weight: 600;
    padding: 0 18px;
    white-space: nowrap;
}
.article-search button:hover {
    background: #e7effc;
}
.category-nav {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    border-bottom: 1px solid var(--line);
    padding: 0 0 22px;
}
.category-nav a {
    padding: 10px 15px;
    font-size: 14px;
    border-radius: 4px;
    color: #536176;
    min-height: 44px;
    display: flex;
    align-items: center;
}
.category-nav a:hover {
    background: var(--wash);
}
.category-nav .is-current {
    color: var(--accent);
    background: #edf3fe;
    font-weight: 600;
}
.search-result {
    padding: 24px 0 0;
    color: var(--muted);
    font-size: 14px;
    display: flex;
    justify-content: space-between;
    gap: 20px;
}
.search-result a {
    color: var(--accent);
}
.article-stream {
    max-width: 1040px;
}
.article-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 255px;
    gap: 40px;
    align-items: center;
    padding: 36px 0;
    border-bottom: 1px solid var(--line);
}
.article-row.without-image {
    grid-template-columns: minmax(0, 1fr);
}
.article-row-content {
    max-width: 760px;
}
.article-meta {
    display: flex;
    align-items: center;
    gap: 18px;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.5;
}
.article-meta > span:first-child {
    color: var(--accent);
}
.article-row h2 {
    font-size: 25px;
    line-height: 1.5;
    font-weight: 600;
    margin: 12px 0 14px;
    letter-spacing: -0.02em;
    overflow-wrap: anywhere;
}
.article-row p {
    font-size: 15px;
    line-height: 1.9;
    color: var(--muted);
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.article-row-bottom {
    display: flex;
    gap: 20px;
    justify-content: space-between;
    align-items: center;
    margin-top: 24px;
    font-size: 13px;
    color: var(--muted);
}
.article-row-bottom > a {
    color: var(--accent);
    padding: 5px 0;
}
.article-cover {
    overflow: hidden;
    border-radius: 5px;
    aspect-ratio: 8/5;
    background: var(--wash);
}
.article-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: opacity 0.2s;
}
.article-cover:hover img {
    opacity: 0.9;
}
.pagination {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
    padding: 40px 0 0;
}
.pagination a,
.pagination span {
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 10px 14px;
    border: 1px solid var(--line);
    border-radius: 4px;
    font-size: 14px;
}
.pagination span {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}
.empty-state {
    padding: 85px 20px 100px;
    text-align: center;
}
.empty-state h2 {
    font-weight: 500;
    font-size: 25px;
    margin: 0 0 18px;
}
.empty-state p {
    color: var(--muted);
    line-height: 1.8;
}
.text-link {
    color: var(--accent);
    display: inline-block;
    padding: 14px;
}
.site-footer {
    border-top: 1px solid var(--line);
    margin-top: 80px;
    padding: 32px 0;
}
.footer-inner {
    display: flex;
    justify-content: space-between;
    gap: 24px;
    font-size: 13px;
    color: var(--muted);
}
.footer-inner > a {
    color: var(--ink);
    font-weight: 600;
}
.article-detail {
    padding-top: 32px;
}
.breadcrumbs {
    display: flex;
    gap: 12px;
    color: var(--muted);
    font-size: 13px;
    align-items: center;
    flex-wrap: wrap;
    line-height: 2;
}
.breadcrumbs a {
    padding: 5px 0;
}
.article-heading {
    padding: 44px 0 36px;
    border-bottom: 1px solid var(--line);
    max-width: 880px;
}
.article-heading h1 {
    font-family: var(--serif);
    font-weight: 600;
    font-size: 40px;
    line-height: 1.5;
    letter-spacing: -0.025em;
    margin: 20px 0 24px;
    overflow-wrap: anywhere;
}
.byline {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    font-size: 13px;
    color: var(--muted);
    line-height: 1.6;
}
.reading-layout {
    display: grid;
    grid-template-columns: minmax(0, 800px) minmax(180px, 1fr);
    gap: 64px;
    padding-top: 32px;
}
.reading-main {
    min-width: 0;
}
.article-abstract {
    font-size: 17px;
    line-height: 1.9;
    color: #536276;
    margin: 0 0 32px;
    padding: 16px 22px;
    border-left: 3px solid #c1d3ef;
    background: #f8fafd;
}
.article-body {
    font-size: 17px;
    line-height: 1.95;
    overflow-wrap: anywhere;
    color: #2e3745;
}
.article-body p {
    margin: 0 0 1.5em;
}
.article-body h2 {
    font-size: 27px;
    line-height: 1.55;
    margin: 1.8em 0 0.8em;
}
.article-body h3 {
    font-size: 22px;
    line-height: 1.6;
    margin: 1.6em 0 0.7em;
}
.article-body h4 {
    font-size: 19px;
}
.article-body img,
.article-body video {
    max-width: 100%;
    height: auto;
    border-radius: 3px;
}
.article-body img {
    display: inline-block;
}
.article-body a {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 3px;
}
.article-body ul,
.article-body ol {
    padding-left: 1.6em;
}
.article-body blockquote {
    margin: 28px 0;
    padding: 4px 24px;
    border-left: 3px solid #cbd7e9;
    color: #607088;
}
.article-body blockquote p:last-child {
    margin-bottom: 0;
}
.article-body pre {
    max-width: 100%;
    overflow: auto;
    background: var(--wash);
    padding: 20px;
    font-size: 14px;
    line-height: 1.6;
}
.article-body table {
    border-collapse: collapse;
    max-width: 100%;
    display: block;
    overflow: auto;
    font-size: 15px;
    margin: 24px 0;
}
.article-body th,
.article-body td {
    border: 1px solid #dce3ed;
    padding: 10px 14px;
    min-width: 90px;
}
.article-body th {
    background: var(--wash);
}
.article-body figure {
    margin: 24px 0;
}
.article-body figcaption {
    text-align: center;
    color: var(--muted);
    font-size: 13px;
}
.article-keywords {
    border-top: 1px solid var(--line);
    margin-top: 40px;
    padding-top: 22px;
    display: flex;
    gap: 20px;
    font-size: 13px;
    line-height: 1.8;
    color: var(--muted);
}
.article-keywords > span {
    flex-shrink: 0;
}
.article-keywords p {
    margin: 0;
}
.article-end {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--line);
    font-size: 14px;
}
.article-end a {
    color: var(--accent);
    min-height: 44px;
}
.article-end span {
    color: var(--muted);
}
.reading-aside {
    border-left: 1px solid var(--line);
    padding-left: 28px;
    align-self: start;
}
.reading-aside h2 {
    font-size: 16px;
    font-weight: 600;
    margin: 0 0 22px;
}
.reading-aside ul {
    list-style: none;
    margin: 0;
    padding: 0;
}
.reading-aside li {
    padding: 0 0 20px;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--line);
}
.reading-aside a {
    font-size: 14px;
    line-height: 1.8;
    display: block;
}
.reading-aside time {
    display: block;
    font-size: 12px;
    color: var(--muted);
    margin-top: 10px;
}
.muted {
    color: var(--muted);
    font-size: 14px;
    line-height: 1.8;
}
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}
.skip-link {
    position: fixed;
    top: -80px;
    left: 20px;
    background: var(--accent);
    color: #fff;
    z-index: 10;
    padding: 14px;
}
.skip-link:focus {
    top: 12px;
    color: #fff;
}
@media (max-width: 1000px) {
    .site-shell {
        width: calc(100% - 48px);
    }
    .reading-layout {
        grid-template-columns: minmax(0, 1fr);
        gap: 48px;
    }
    .reading-main {
        max-width: 800px;
    }
    .reading-aside {
        border-left: 0;
        border-top: 1px solid var(--line);
        padding: 28px 0 0;
    }
    .reading-aside ul {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 24px;
    }
    .reading-aside li {
        margin: 0;
    }
    .index-heading {
        align-items: flex-start;
    }
    .article-search {
        flex-basis: 310px;
    }
    .article-row {
        grid-template-columns: minmax(0, 1fr) 210px;
        gap: 24px;
    }
    .article-heading {
        max-width: 100%;
    }
}
@media (max-width: 640px) {
    .site-shell {
        width: calc(100% - 36px);
    }
    .header-inner {
        min-height: 82px;
        padding: 18px 0;
        align-items: flex-start;
        flex-direction: column;
        gap: 8px;
    }
    .site-brand {
        font-size: 19px;
    }
    .site-nav {
        gap: 22px;
    }
    .site-nav a {
        padding: 8px 0;
        min-height: 40px;
    }
    .article-index {
        padding-top: 32px;
    }
    .index-heading {
        display: block;
        padding-bottom: 24px;
    }
    .index-heading h1 {
        font-size: 34px;
        margin-bottom: 12px;
    }
    .index-heading p {
        font-size: 14px;
    }
    .article-search {
        margin-top: 24px;
        min-height: 46px;
    }
    .category-nav {
        gap: 5px;
        padding-bottom: 16px;
    }
    .category-nav a {
        padding: 9px 12px;
    }
    .article-row {
        grid-template-columns: minmax(0, 1fr);
        gap: 18px;
        padding: 28px 0;
    }
    .article-row h2 {
        font-size: 22px;
        line-height: 1.5;
        margin: 10px 0 12px;
    }
    .article-cover {
        width: 100%;
        max-height: 230px;
        grid-row: 1;
    }
    .article-row p {
        font-size: 14px;
    }
    .article-row-bottom {
        margin-top: 18px;
    }
    .footer-inner {
        flex-direction: column;
        gap: 12px;
        line-height: 1.8;
    }
    .site-footer {
        margin-top: 52px;
        padding: 26px 0;
    }
    .article-heading {
        padding: 28px 0;
    }
    .article-heading h1 {
        font-size: 29px;
        line-height: 1.55;
        margin: 16px 0 20px;
    }
    .byline {
        gap: 10px 18px;
    }
    .article-detail {
        padding-top: 20px;
    }
    .reading-layout {
        padding-top: 24px;
    }
    .article-abstract {
        font-size: 15px;
        padding: 14px 16px;
        margin-bottom: 28px;
    }
    .article-body {
        font-size: 16px;
        line-height: 1.95;
    }
    .article-body h2 {
        font-size: 23px;
    }
    .article-body h3 {
        font-size: 20px;
    }
    .reading-aside ul {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .article-meta {
        font-size: 12px;
    }
    .pagination {
        gap: 5px;
    }
    .pagination a,
    .pagination span {
        padding: 10px;
        min-width: 40px;
    }
    .empty-state {
        padding: 64px 0;
    }
}
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    * {
        transition: none !important;
    }
}