/* Yundaichuan Zhan — an editorial academic homepage. */

:root {
    color-scheme: light;
    --paper: #f7f5ef;
    --ink: #292822;
    --muted: #6d685f;
    --accent: #8a4939;
    --rule: #d8d3c8;
    --serif: Georgia, "Times New Roman", "Songti SC", serif;
    --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

html {
    scroll-behavior: smooth;
    scroll-padding-top: 30px;
}

body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: var(--sans);
    font-size: 16px;
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
}

::selection { background: #e7d8ca; }

a {
    color: var(--accent);
    text-decoration-thickness: 1px;
    text-underline-offset: 4px;
}

a:hover { text-decoration: underline; }

a:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 5px;
}

p, h1, h2, h3, figure { margin: 0; }

img { display: block; max-width: 100%; }

strong { font-weight: 600; }

.site-shell {
    width: min(1040px, calc(100% - 112px));
    margin-inline: auto;
}

.skip-link {
    position: absolute;
    top: -100px;
    left: 20px;
    z-index: 10;
    padding: 8px 16px;
    background: var(--ink);
    color: var(--paper);
}

.skip-link:focus { top: 12px; }

/* Masthead and introduction */

.site-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 27px 0 23px;
    border-bottom: 1px solid var(--rule);
}

.wordmark {
    color: var(--ink);
    font-family: var(--serif);
    font-size: 25px;
    letter-spacing: -0.7px;
    text-decoration: none;
    white-space: nowrap;
}

.wordmark span { color: var(--accent); }

.site-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 28px;
}

.site-nav a {
    color: var(--muted);
    font-size: 12px;
    letter-spacing: 0.04em;
    text-decoration: none;
}

.site-nav a:hover { color: var(--accent); text-decoration: underline; }

.profile {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 220px;
    align-items: center;
    gap: 90px;
    padding: 74px 0 78px;
}

.eyebrow {
    margin-bottom: 17px;
    color: var(--accent);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.profile h1 {
    font-family: var(--serif);
    font-size: clamp(50px, 5.8vw, 72px);
    font-weight: 400;
    letter-spacing: -2.8px;
    line-height: 1.04;
}

.surname { display: block; font-style: italic; }

.chinese-name {
    margin-top: 17px;
    color: var(--muted);
    font-family: "Songti SC", "STSong", var(--serif);
    font-size: 18px;
    letter-spacing: 0.18em;
}

.position {
    margin-top: 25px;
    color: var(--muted);
    font-size: 14px;
    line-height: 1.8;
}

.position a { color: inherit; text-decoration: none; }

.research-area {
    margin-top: 18px;
    font-family: var(--serif);
    font-size: 21px;
}

.contact-links {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
    margin-top: 25px;
    font-size: 12px;
}

.contact-links a { text-decoration: none; }
.contact-links a:hover { text-decoration: underline; }
.contact-divider { color: var(--rule); }

.portrait {
    padding: 8px;
    border: 1px solid var(--rule);
    transform: rotate(2deg);
}

.portrait img {
    width: 100%;
    height: 260px;
    object-fit: cover;
    object-position: 50% 45%;
}

/* Section labels share a narrow left column. */

.content-section {
    display: grid;
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 48px;
    padding: 43px 0 47px;
    border-top: 1px solid var(--rule);
}

.section-number {
    display: block;
    margin-bottom: 8px;
    color: var(--accent);
    font-size: 10px;
    letter-spacing: 0.08em;
}

.section-heading h2 {
    font-family: var(--serif);
    font-size: 28px;
    font-weight: 400;
    letter-spacing: -0.6px;
    line-height: 1.3;
}

.section-note {
    margin-top: 11px;
    color: var(--muted);
    font-size: 12px;
}

.prose { max-width: 720px; }
.prose p + p { margin-top: 17px; }

/* Publications are typeset entries, with figures in the outer margin. */

.publication {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 184px;
    align-items: start;
    gap: 28px;
    padding: 31px 0;
}

.publication:first-child { padding-top: 0; }
.publication:last-child { padding-bottom: 0; }
.publication + .publication { border-top: 1px solid var(--rule); }

.publication-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 6px 13px;
    margin-bottom: 10px;
    color: var(--accent);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.035em;
}

.first-author {
    padding-left: 13px;
    border-left: 1px solid var(--rule);
    color: var(--muted);
    font-size: 10px;
}

.publication h3 {
    font-family: var(--serif);
    font-size: 23px;
    font-weight: 400;
    letter-spacing: -0.35px;
    line-height: 1.35;
}

.publication h3 a { color: var(--ink); text-decoration: none; }
.publication h3 a:hover { color: var(--accent); text-decoration: underline; }

.publication-authors {
    margin-top: 11px;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.8;
}

.publication-authors strong { color: var(--ink); }

.publication-links {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-top: 15px;
    font-size: 12px;
}

.publication-links a { text-decoration: underline; }
.publication-links a:hover { text-decoration-thickness: 2px; }
.publication-links span { padding-left: 2px; }

.publication-figure {
    display: block;
    margin-top: 32px;
    border: 1px solid #e5e0d6;
    background: #fff;
    overflow: hidden;
}

.publication-figure img,
.publication-figure svg { display: block; width: 100%; height: auto; }

/* Education */

.education-item {
    display: grid;
    grid-template-columns: 126px minmax(0, 1fr);
    gap: 22px;
    padding: 21px 0;
}

.education-item:first-child { padding-top: 0; }
.education-item:last-child { padding-bottom: 0; }
.education-item + .education-item { border-top: 1px solid var(--rule); }

.education-date {
    color: var(--muted);
    font-size: 12px;
    font-variant-numeric: tabular-nums;
}

.education-item h3 { font-size: 15px; font-weight: 600; }
.education-item h3 a { color: var(--ink); text-decoration: none; }
.education-item h3 a:hover { color: var(--accent); text-decoration: underline; }
.education-item p:not(.education-date) { margin-top: 4px; font-size: 13px; color: var(--muted); }

/* Footer and smaller screens */

.site-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    padding: 24px 0 35px;
    border-top: 1px solid var(--rule);
    color: var(--muted);
    font-size: 11px;
}

.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }

@media (max-width: 960px) {
    .site-shell { width: calc(100% - 72px); }
    .profile { grid-template-columns: minmax(0, 1fr) 190px; gap: 45px; }
    .portrait img { height: 235px; }
    .content-section { grid-template-columns: 135px minmax(0, 1fr); gap: 30px; }
    .publication { grid-template-columns: minmax(0, 1fr) 145px; gap: 22px; }
    .publication h3 { font-size: 21px; }
}

@media (max-width: 720px) {
    .site-shell { width: calc(100% - 44px); }
    .site-header { align-items: flex-start; flex-direction: column; gap: 14px; padding: 21px 0; }
    .site-nav { gap: 23px; }
    .profile { grid-template-columns: minmax(0, 1fr) 130px; align-items: start; gap: 25px; padding: 48px 0; }
    .profile h1 { font-size: 49px; letter-spacing: -2px; }
    .portrait { margin-top: 43px; padding: 5px; }
    .portrait img { height: 165px; }
    .content-section { grid-template-columns: 1fr; gap: 27px; padding: 32px 0 38px; }
    .section-heading { display: flex; flex-wrap: wrap; align-items: baseline; gap: 13px; }
    .section-number { margin: 0; }
    .section-heading h2 { font-size: 27px; }
    .section-note { margin: 0 0 0 auto; }
    .prose { font-size: 15px; }
    .publication { grid-template-columns: minmax(0, 1fr) 145px; }
}

@media (max-width: 520px) {
    .profile { display: block; position: relative; }
    .eyebrow { max-width: calc(100% - 110px); font-size: 10px; }
    .profile h1 { max-width: calc(100% - 105px); font-size: 43px; letter-spacing: -1.9px; overflow-wrap: anywhere; }
    .portrait { position: absolute; top: 53px; right: 0; width: 94px; margin: 0; transform: rotate(2deg); }
    .portrait img { height: 120px; }
    .chinese-name { margin-top: 15px; font-size: 16px; }
    .position { margin-top: 25px; font-size: 13px; }
    .research-area { font-size: 20px; }
    .contact-links { gap: 10px; font-size: 11px; }
    .publication { grid-template-columns: 1fr; gap: 20px; }
    .publication h3 { font-size: 23px; }
    .publication-figure { order: -1; width: 100%; max-width: 240px; margin: 0; }
    .publication-authors { font-size: 13px; }
    .education-item { grid-template-columns: 1fr; gap: 6px; }
    .site-footer { align-items: flex-start; font-size: 10px; }
}

@media (max-width: 360px) {
    .eyebrow { max-width: none; font-size: 9px; letter-spacing: 0.12em; }
    .profile h1 { max-width: calc(100% - 82px); font-size: 35px; letter-spacing: -2px; }
    .portrait { width: 76px; padding: 4px; }
    .portrait img { height: 104px; }
    .site-nav { gap: 17px; }
}

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