:root {
    color-scheme: light dark;
    --color-text: #494e52;
    --color-heading: #353b3f;
    --color-muted: #68737b;
    --color-link: #177d9d;
    --color-link-hover: #105b73;
    --color-bg: #fff;
    --color-footer: #f5f6f7;
    --color-border: #eceeef;
    --site-width: 1200px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 108px; -webkit-text-size-adjust: 100%; }
body {
    margin: 0;
    background: var(--color-bg);
    color: var(--color-text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue",
        Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
    font-size: 1.0625rem;
    line-height: 1.8;
    overflow-wrap: break-word;
}
a { color: var(--color-link); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--color-link-hover); }
:focus-visible { outline: 2px solid var(--color-link); outline-offset: 5px; border-radius: 2px; }
[hidden] { display: none !important; }
.skip-link {
    position: fixed; top: 12px; left: 16px; z-index: 100;
    padding: 8px 16px; background: var(--color-bg); transform: translateY(-180%);
}
.skip-link:focus { transform: translateY(0); }

.masthead {
    position: sticky; top: 0; z-index: 10;
    border-bottom: 1px solid var(--color-border); background: var(--color-bg);
}
.masthead-inner {
    display: flex; align-items: center; gap: 64px;
    max-width: var(--site-width); min-height: 82px; margin: 0 auto; padding: 12px 28px;
}
.site-name {
    flex: 0 0 auto; color: var(--color-heading); font-size: 1.125rem;
    font-weight: 700; text-decoration: none;
}
.nav-links {
    display: flex; align-items: center; flex-wrap: wrap; gap: 8px 27px;
    margin: 0; padding: 0; list-style: none; font-size: 1rem;
}
.nav-links a {
    display: block; padding: 8px 0; border-bottom: 2px solid transparent;
    color: var(--color-muted); text-decoration: none;
}
.nav-links a:hover, .nav-links a[aria-current="location"] {
    border-bottom-color: var(--color-link); color: var(--color-heading);
}
.page-layout {
    display: grid; grid-template-columns: 220px minmax(0, 1fr); align-items: start;
    gap: 62px; max-width: var(--site-width); margin: 43px auto 76px; padding: 0 28px;
}
.author-profile { position: sticky; top: 118px; padding-top: 2px; font-size: 0.875rem; line-height: 1.6; }
.author-avatar {
    display: block; width: 170px; height: 170px; margin-bottom: 20px;
    padding: 5px; border: 1px solid var(--color-border); border-radius: 50%; object-fit: cover;
}
.author-name { margin: 0 0 6px; color: var(--color-heading); font-size: 1.1875rem; font-weight: 700; }
.chinese-name { margin-left: 3px; font-size: 1.0625rem; }
.author-bio { margin: 0 0 3px; }
.author-role { margin: 0; color: var(--color-muted); }
.author-links { display: grid; gap: 10px; margin: 20px 0 0; padding: 0; list-style: none; }
.author-links li, .author-links a { display: flex; align-items: center; gap: 10px; }
.author-links a { color: var(--color-text); text-decoration: none; }
.author-links a:hover { color: var(--color-link); text-decoration: underline; }
.icon { flex: 0 0 auto; width: 16px; height: 16px; }

.page-content { min-width: 0; }
h1, h2, h3, h4 { color: var(--color-heading); line-height: 1.45; }
h1 { margin: -5px 0 20px; font-size: 1.875rem; letter-spacing: -0.5px; }
h2 {
    margin: 38px 0 22px; padding-bottom: 9px; border-bottom: 1px solid var(--color-border);
    font-size: 1.4375rem; letter-spacing: -0.2px;
}
h3, h4 { margin: 0; font-size: 1.0625rem; font-weight: 650; }
p { margin: 0 0 16px; }
strong { color: var(--color-heading); font-weight: 650; }
.research-interests { margin-bottom: 0; }
.entry-heading {
    display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between;
    gap: 4px 18px; margin-bottom: 5px;
}
.entry-date { flex: 0 0 auto; margin: 0; color: var(--color-muted); font-size: 0.875rem; font-variant-numeric: tabular-nums; }
.entry-meta { margin-bottom: 14px; color: var(--color-muted); font-size: 0.9375rem; }
.work-list, .detail-list { margin: 0 0 14px; padding-left: 22px; }
.work-list > li { margin-bottom: 20px; padding-left: 3px; }
.work-list h4 { margin-bottom: 7px; }
.work-list p { margin-bottom: 8px; }
.detail-list li { margin-bottom: 6px; padding-left: 3px; }
.tech-line { margin-bottom: 0; color: var(--color-muted); font-size: 0.875rem; }
.project-entry + .project-entry { margin-top: 27px; }
.more-projects { margin: 22px 0 0; font-size: 0.9375rem; }
.skills-list { margin: 0; }
.skills-list > div { display: grid; grid-template-columns: 136px minmax(0, 1fr); gap: 14px; margin-bottom: 9px; }
.skills-list dt { color: var(--color-heading); font-weight: 600; }
.skills-list dd { margin: 0; }
.contact-links { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 14px; margin: 0; overflow-wrap: anywhere; }
.contact-separator { color: var(--color-muted); }

.page-footer { border-top: 1px solid var(--color-border); background: var(--color-footer); color: var(--color-muted); font-size: 0.875rem; }
.footer-inner {
    display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px 24px;
    max-width: var(--site-width); margin: 0 auto; padding: 27px 28px;
}
.footer-inner p { margin: 0; }
.footer-inner a { color: inherit; text-decoration: none; }
#back-to-top {
    position: fixed; right: 22px; bottom: 22px; z-index: 5;
    display: flex; align-items: center; justify-content: center; width: 42px; height: 42px;
    border: 1px solid var(--color-border); border-radius: 4px;
    background: var(--color-bg); color: var(--color-muted);
}
#back-to-top:hover { color: var(--color-link); border-color: currentColor; }

@media (prefers-color-scheme: dark) {
    :root {
        --color-text: #d2d6d9;
        --color-heading: #eff1f3;
        --color-muted: #a1aab2;
        --color-link: #70bed8;
        --color-link-hover: #a5d9eb;
        --color-bg: #1c2024;
        --color-footer: #22272c;
        --color-border: #353c43;
    }
}

@media (max-width: 1100px) {
    .masthead-inner { gap: 35px; }
    .nav-links { column-gap: 20px; }
    .page-layout { grid-template-columns: 200px minmax(0, 1fr); gap: 38px; }
}

@media (max-width: 900px) {
    html { scroll-padding-top: 150px; }
    .masthead-inner { flex-wrap: wrap; gap: 0; padding-top: 14px; padding-bottom: 8px; }
    .site-name { width: 100%; }
    .nav-links { column-gap: 24px; row-gap: 0; }
    .author-profile { top: 150px; }
    .page-layout { grid-template-columns: 180px minmax(0, 1fr); gap: 30px; margin-top: 32px; }
    .author-avatar { width: 150px; height: 150px; }
    .entry-date { flex-shrink: 1; }
}

@media (max-width: 700px) {
    .masthead { position: relative; }
    html { scroll-padding-top: 24px; }
    .masthead-inner { padding-right: 22px; padding-left: 22px; }
    .nav-links { column-gap: 21px; font-size: 0.9375rem; }
    .nav-links a { padding: 7px 0; }
    .page-layout { display: block; margin: 27px auto 48px; padding: 0 22px; }
    .author-profile {
        position: static; display: flex; align-items: center; gap: 23px;
        margin-bottom: 30px; padding: 0 0 26px; border-bottom: 1px solid var(--color-border);
    }
    .author-avatar { flex: 0 0 auto; width: 108px; height: 108px; margin: 0; padding: 4px; }
    .author-details { min-width: 0; }
    .author-name { font-size: 1.125rem; }
    .chinese-name { font-size: 1rem; }
    .author-links { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 10px; }
    .author-links li:first-child { flex-basis: 100%; }
    .author-links a { min-height: 28px; }
    h1 { font-size: 1.6875rem; }
    h2 { margin-top: 32px; font-size: 1.375rem; }
    .skills-list > div { grid-template-columns: 1fr; gap: 0; margin-bottom: 12px; }
    .footer-inner { padding: 24px 22px; }
    #back-to-top { right: 12px; bottom: 12px; }
}

@media (max-width: 380px) {
    .masthead-inner, .page-layout { padding-right: 18px; padding-left: 18px; }
    .author-profile { gap: 16px; align-items: flex-start; }
    .author-avatar { width: 80px; height: 80px; }
    .chinese-name { display: block; margin-left: 0; }
    .nav-links { column-gap: 18px; }
}

@media (max-height: 600px) {
    .author-profile { position: static; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
}

@media print {
    :root {
        --color-text: #333; --color-heading: #222; --color-muted: #555;
        --color-link: #222; --color-bg: #fff; --color-border: #ddd;
    }
    html { scroll-behavior: auto; }
    body { font-size: 10pt; }
    .masthead, .skip-link, .page-footer, #back-to-top { display: none !important; }
    .page-layout { display: block; margin: 0; padding: 0; }
    .author-profile { position: static; display: flex; gap: 20px; margin-bottom: 24px; }
    .author-avatar { width: 85px; height: 85px; margin: 0; }
    .author-links { display: none; }
    h2 { margin-top: 22px; break-after: avoid; }
    h3, h4, .entry-heading { break-after: avoid; }
    a { text-decoration: none; }
}