/* ============================================================
   site.css — shared styles for sunchangsheng.com
   Covers: homepage, blog list, blog posts
   ============================================================ */

/* ------------------------------------------------------------
   Font faces (used by homepage)
   ------------------------------------------------------------ */
@font-face {
    font-family: 'STKaitiSubset';
    src: url('fonts/STKaiti-subset.woff2') format('woff2');
    font-display: swap;
}

@font-face {
    font-family: 'LXGW WenKai';
    src: url('fonts/LXGWWenKai-subset.woff2') format('woff2');
    font-display: swap;
}

/* TeX Gyre Heros - Helvetica alternative for non-Apple systems */
@font-face {
    font-family: 'TeX Gyre Heros';
    src: url('fonts/texgyreheros-regular.otf') format('opentype');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'TeX Gyre Heros';
    src: url('fonts/texgyreheros-bold.otf') format('opentype');
    font-weight: 700;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'TeX Gyre Heros';
    src: url('fonts/texgyreheros-italic.otf') format('opentype');
    font-weight: 400;
    font-style: italic;
    font-display: swap;
}

@font-face {
    font-family: 'TeX Gyre Heros';
    src: url('fonts/texgyreheros-bolditalic.otf') format('opentype');
    font-weight: 700;
    font-style: italic;
    font-display: swap;
}

/* Libre Baskerville - Variable Font */
@font-face {
    font-family: 'Libre Baskerville';
    src: url('fonts/LibreBaskerville-Variable.ttf') format('truetype');
    font-weight: 400 700;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'Libre Baskerville';
    src: url('fonts/LibreBaskerville-Italic-Variable.ttf') format('truetype');
    font-weight: 400 700;
    font-style: italic;
    font-display: swap;
}

/* ------------------------------------------------------------
   Shared base
   ------------------------------------------------------------ */
:root {
    --NUSBLUE: #003D7C;
    /* --NUSBLUE: #003366; */
    /* --NUSBLUE: #000000; */
}

html {
    overflow-y: scroll;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Default body — blog pages */
body {
    /* font-family: -apple-system, BlinkMacSystemFont, segoe ui, Roboto, Oxygen, Ubuntu, Cantarell, open sans, helvetica neue, sans-serif; */
    font-family:
        -apple-system,
        Helvetica,
        'TeX Gyre Heros',
        Arial,
        sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: #333;
    background: #fff;
    padding: 20px;
    max-width: 900px;
    margin: 0 auto;
}

/* ------------------------------------------------------------
   Navigation — shared across all pages
   ------------------------------------------------------------ */
.site-nav {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 15px;
    /* border-bottom: 2px solid var(--NUSBLUE); */
}

.site-nav a {
    color: var(--NUSBLUE);
    text-decoration: none;
    margin-right: 20px;
    font-size: 14px;
}

.site-nav a:hover {
    text-decoration: underline;
    color: #0026ff;
}

/* Push a nav link to the right end */
.site-nav .nav-right {
    margin-left: auto;
    margin-right: 0;
}

/* ============================================================
   HOMEPAGE
   ============================================================ */

/* Homepage body overrides */
body.homepage {
    font-family:
        -apple-system,
        Helvetica,
        'TeX Gyre Heros',
        Arial,
        sans-serif;
    font-size: 14px;
}

/* Sidebar name section */
.homepage .sidebar-name {
    margin-bottom: 10px;
    padding-bottom: 0px;
    /* border-bottom: 2px solid var(--NUSBLUE); */
}

.homepage h1 {
    font-size: 18px;
    color: var(--NUSBLUE);
    font-weight: bold;
    margin-bottom: 0px;
}

.homepage .chinese-name:lang(zh),
.homepage .chinese-name:lang(zh-Hans) {
    font-family:
        'STKaitiSubset',
        'LXGW WenKai',
        ui-serif,
        serif;
    color: var(--NUSBLUE);
    margin-bottom: 5px;
    font-size: 19px;
    font-weight: 600;
}

.homepage .title {
    color: #000000;
    font-size: 14px;
    font-weight: bold;
}

.homepage .affiliation {
    color: #000000;
    font-size: 14px;
}

/* Main content layout */
.homepage .content {
    display: flex;
    gap: 30px;
}

/* Sidebar */
.homepage .sidebar {
    flex: 0 0 180px;
    top: 20px;
    align-self: flex-start;
}

.homepage .photo {
    width: 160px;
    height: 160px;
    background: #f5f5f5;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #999;
    font-size: 12px;
}

.homepage .contact-section {
    margin-top: 20px;
}

.homepage .contact-section h3 {
    font-size: 15px;
    color: var(--NUSBLUE);
    font-weight: bold;
    margin-bottom: 10px;
    border-bottom: 1px solid #ccc;
    padding-bottom: 5px;
}

.homepage .contact-section p {
    font-size: 13px;
    padding-bottom: 5px;
    margin-bottom: 5px;
}

/* Main section */
.homepage .main {
    flex: 1;
}

.homepage h2 {
    font-size: 18px;
    color: var(--NUSBLUE);
    font-weight: bold;
    margin-bottom: 15px;
    border-bottom: 1px solid #ccc;
    padding-bottom: 5px;
}

.homepage h2:first-child {
    margin-top: 0;
}

.homepage p {
    margin-bottom: 15px;
    text-align: justify;
}

/* Links */
.homepage a {
    color: var(--NUSBLUE);
    /* text-decoration: underline; */
    text-decoration: none;
}

.homepage a:hover {
    text-decoration: underline;
    color: #0026ff;
}

/* Nav links should never have underline, even on homepage */
.homepage .site-nav a {
    text-decoration: none;
    color: var(--NUSBLUE);
}

.homepage .site-nav a:hover {
    text-decoration: underline;
    color: #0026ff;
}

/* Lists */
.homepage ul {
    margin-left: 20px;
    margin-bottom: 15px;
}

.homepage li {
    margin-bottom: 8px;
}

.homepage ul ul {
    margin-top: 5px;
    margin-bottom: 5px;
}

.homepage ul ul li {
    margin-bottom: 3px;
}

/* Publications */
.homepage .publication {
    margin-bottom: 20px;
}

.homepage .pub-title {
    font-weight: bold;
    margin-bottom: 5px;
}

.homepage .pub-authors {
    font-style: italic;
    color: #666;
    margin-bottom: 3px;
}

.homepage .pub-venue {
    color: #333;
    margin-bottom: 3px;
}

.homepage .pub-links {
    font-size: 13px;
}

.homepage .pub-links a {
    margin-right: 10px;
}

/* Footer */
.homepage .footer {
    padding-top: 20px;
    text-align: right;
    font-size: 12px;
    color: #666;
}

/* Year headings */
.homepage .year-heading {
    font-weight: bold;
    color: var(--NUSBLUE);
    margin-top: 20px;
    margin-bottom: 15px;
    font-size: 16px;
}

/* Homepage responsive */
@media (max-width: 768px) {
    .homepage .content {
        flex-direction: column;
    }

    .homepage .sidebar {
        flex: none;
        width: 100%;
        position: static;
    }

    /* Header row: photo left, name right on mobile */
    .homepage .sidebar-header {
        display: flex;
        align-items: top;
        gap: 15px;
    }

    .homepage .photo {
        width: 110px;
        height: 110px;
        flex-shrink: 0;
        margin: 0;
    }

    .homepage .sidebar-name {
        text-align: left;
    }

    /* Office address: hide line breaks on mobile */
    .homepage .office-address br,
    .homepage .contact-inline br {
        display: none;
    }
    .homepage .office-address span::after {
        content: ', ';
    }
    .homepage .office-address span:last-of-type::after {
        content: '';
    }

    /* Links: inline on mobile */
    .homepage .links-inline p {
        display: inline;
    }
    .homepage .links-inline p::after {
        content: ' · ';
    }
    .homepage .links-inline p:last-child::after {
        content: '';
    }
}

/* ============================================================
   BLOG — post header, content, index
   ============================================================ */

/* Post header */
.post-header {
    margin-bottom: 30px;
}

.post-header h1 {
    font-size: 22px;
    color: var(--NUSBLUE);
    font-weight: bold;
    margin-bottom: 10px;
    line-height: 1.3;
}

.post-meta {
    color: #666;
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.post-meta time {
    color: #666;
}

.post-meta .meta-separator {
    color: #999;
}

.post-meta .post-author {
    color: #666;
}

/* Table of Contents */
.toc {
    margin: 0 0 10px 0;
    border: 1px solid #ddd;
    background: #f9f9f9;
    border-radius: 4px;
    padding: 0;
    font-size: 12px;
}

.toc details {
    padding: 10px 15px;
}

.toc details summary {
    cursor: pointer;
    font-weight: bold;
    font-size: 14px;
    user-select: none;
    list-style: none;
}

.toc details summary::-webkit-details-marker {
    display: none;
}

.toc details summary::before {
    content: '▶ ';
    display: inline-block;
    transition: transform 0.2s;
}

.toc details[open] summary::before {
    transform: rotate(90deg);
}

.toc .toctitle {
    display: block;
    font-size: 12px;
    font-weight: bold;
    color: var(--NUSBLUE);
    margin-top: 5px;
    margin-bottom: 5px;
}

.toc ul {
    margin: 10px 0 0 0;
    padding-left: 20px;
    list-style: none;
}

.toc li {
    margin: 5px 0;
    line-height: 1.4;
}

.toc a {
    color: #333;
    text-decoration: none;
}

.toc a:hover {
    color: var(--NUSBLUE);
    text-decoration: underline;
}

/* Post content */
.post-content {
    line-height: 1.7;
}

.post-content h1 {
    font-size: 20px;
    color: var(--NUSBLUE);
    font-weight: bold;
    margin-top: 28px;
    margin-bottom: 20px;
    border-bottom: 1px solid #ccc;
}

.post-content h2 {
    font-size: 18px;
    color: var(--NUSBLUE);
    font-weight: bold;
    margin-top: 30px;
    margin-bottom: 10px;
    padding-bottom: 5px;
}

.post-content h3 {
    font-size: 18px;
    color: var(--NUSBLUE);
    font-weight: normal;
    margin-top: 25px;
    margin-bottom: 10px;
}

.post-content h4 {
    font-size: 16px;
    color: var(--NUSBLUE);
    margin-top: 20px;
    margin-bottom: 8px;
}

.post-content h5 {
    font-size: 14px;
    color: var(--NUSBLUE);
    margin-top: 18px;
    margin-bottom: 8px;
}

.post-content h6 {
    font-size: 12px;
    color: var(--NUSBLUE);
    margin-top: 15px;
    margin-bottom: 8px;
}

.post-content p {
    margin-bottom: 14px;
    text-align: left;
}

.post-content a {
    color: var(--NUSBLUE);
    text-decoration: underline;
}

.post-content ul,
.post-content ol {
    margin-left: 20px;
    margin-bottom: 14px;
}

.post-content li {
    margin-bottom: 8px;
}

/* Code blocks */
.post-content code {
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 13px;
    background: #f5f5f5;
    padding: 2px 5px;
    border-radius: 3px;
}

.post-content pre {
    background: #f8f8f8;
    border: 1px solid #ddd;
    border-left: 3px solid var(--NUSBLUE);
    padding: 15px;
    margin-bottom: 20px;
    overflow-x: auto;
    line-height: 1.5;
}

.post-content pre code {
    background: none;
    padding: 0;
    font-size: 13px;
}

/* Math blocks */
.katex-display {
    margin: 20px 0;
    padding: 10px 20px;
    overflow-x: auto;
}

/* Block quotes */
.post-content blockquote {
    border-left: 3px solid var(--NUSBLUE);
    margin: 20px 0;
    padding: 10px 20px;
    background: #f9f9f9;
    color: #555;
}

/* Images */
.post-content img {
    max-width: 100%;
    height: auto;
    margin: 20px 0;
}

/* Tables */
.post-content table {
    border-collapse: collapse;
    width: 100%;
    margin-bottom: 20px;
}

.post-content th,
.post-content td {
    border: 1px solid #ddd;
    padding: 8px 12px;
    text-align: left;
}

.post-content th {
    background: #f5f5f5;
    color: var(--NUSBLUE);
}

/* Post disclaimer */
.post-disclaimer {
    margin-top: 40px;
    padding: 15px 20px;
    border-top: 1px solid #ddd;
    border-bottom: 1px solid #ddd;
    background: #f9f9f9;
    font-size: 14px;
    line-height: 1.6;
    color: #555;
}

.post-disclaimer p {
    margin: 0;
}

.post-disclaimer strong {
    color: #333;
}

/* Post footer */
.post-footer {
    margin-top: 20px;
    padding-top: 20px;
}

.post-footer a {
    color: var(--NUSBLUE);
    text-decoration: none;
}

.post-footer a:hover {
    text-decoration: underline;
}

/* Site footer */
.site-footer {
    margin-top: 10px;
    padding-top: 10px;
    text-align: center;
    font-size: 12px;
    color: #666;
}

/* Blog index page */
.blog-index {
    margin-top: 0;
}

.post-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.post-item {
    margin-bottom: 10px;
    padding-bottom: 10px;
}

.post-item a {
    display: block;
    color: var(--NUSBLUE);
    text-decoration: none;
    font-size: 22px;
    font-weight: bold;
    line-height: 1.3;
    margin-bottom: 10px;
}

.post-item a:hover {
    text-decoration: underline;
}

.post-description {
    color: #333;
    font-size: 14px;
    margin-top: 10px;
}

/* Blog responsive */
@media (max-width: 768px) {
    body {
        padding: 15px;
    }

    /* .post-header h1 {
        font-size: 22px;
    } */
}