/* =========================================================
   Zilong Wang — restrained academic homepage
   No framework / no external fonts / no JavaScript
   ========================================================= */

:root {
  --bg: #fcfcfb;
  --paper: #ffffff;
  --text: #20252b;
  --muted: #66717b;
  --faint: #929aa1;
  --link: #2c5f85;
  --link-hover: #163f5d;
  --rule: #e6e8e8;
  --shell: 900px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Helvetica,
    Arial,
    sans-serif;
  font-size: 16px;
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--link);
  text-decoration: none;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

p {
  margin: 0;
}

strong {
  font-weight: 650;
}

.shell {
  width: min(calc(100% - 40px), var(--shell));
  margin-inline: auto;
}

section {
  scroll-margin-top: 76px;
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(252, 252, 251, 0.95);
  border-bottom: 1px solid var(--rule);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.header-inner {
  min-height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.site-name {
  color: var(--text);
  font-family: ui-serif, Georgia, "Times New Roman", serif;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.site-name:hover {
  color: var(--text);
  text-decoration: none;
}

.nav {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav a {
  color: var(--muted);
  font-size: 13px;
  font-weight: 500;
}

.nav a:hover {
  color: var(--text);
  text-decoration: none;
}

/* ---------- Intro ---------- */

.intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 170px;
  gap: 58px;
  align-items: center;
  padding-top: 62px;
  padding-bottom: 54px;
}

.intro h1 {
  margin: 0 0 9px;
  font-family: ui-serif, Georgia, "Times New Roman", serif;
  font-size: clamp(38px, 5.5vw, 50px);
  line-height: 1.05;
  font-weight: 700;
  letter-spacing: -0.035em;
}

.position {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.55;
}

.lead {
  max-width: 650px;
  margin-top: 22px;
  color: #343b42;
  font-size: 18px;
  line-height: 1.64;
}

.affiliation {
  margin-top: 15px;
  color: var(--muted);
  font-size: 14px;
}

.profile-links {
  display: flex;
  flex-wrap: wrap;
  gap: 3px 8px;
  margin-top: 18px;
  font-size: 14px;
  font-weight: 550;
}

.profile-links span {
  color: #b1b6ba;
}

.research-line {
  margin-top: 21px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

.research-line span {
  color: var(--text);
  font-weight: 600;
}

.portrait-wrap {
  width: 170px;
  height: 190px;
  overflow: hidden;
  border-radius: 10px;
  background: #f1f2f1;
}

.portrait {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  object-position: center 18%;
  transform: scale(1.06);
  transform-origin: center 28%;
}

/* ---------- Generic sections ---------- */

.section {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  gap: 38px;
  padding: 42px 0;
  border-top: 1px solid var(--rule);
}

.section > h2,
.section-title-row h2 {
  margin: 0;
  font-family: ui-serif, Georgia, "Times New Roman", serif;
  font-size: 22px;
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.section-body {
  min-width: 0;
}

.prose {
  color: #414950;
  font-size: 15.5px;
}

.prose p + p {
  margin-top: 14px;
}

/* ---------- News ---------- */

.news-list {
  display: grid;
}

.news-row {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 20px;
  padding: 0 0 15px;
}

.news-row:last-child {
  padding-bottom: 0;
}

.news-row time {
  color: var(--faint);
  font-size: 12px;
  font-weight: 650;
  line-height: 1.7;
}

.news-row p {
  color: #434b52;
  font-size: 14px;
  line-height: 1.62;
}

/* ---------- Publications ---------- */

#publications {
  grid-template-columns: 1fr;
  gap: 26px;
}

.section-title-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 24px;
}

.all-papers {
  flex: 0 0 auto;
  color: var(--muted);
  font-size: 13px;
}

.publications {
  display: grid;
  gap: 31px;
}

.year-block {
  display: grid;
  grid-template-columns: 70px minmax(0, 1fr);
  gap: 28px;
}

.year {
  padding-top: 1px;
  color: var(--faint);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.paper-list {
  display: grid;
  gap: 23px;
}

.paper {
  max-width: 760px;
}

.paper h3 {
  margin: 0;
  color: var(--text);
  font-size: 15.5px;
  line-height: 1.48;
  font-weight: 650;
  letter-spacing: -0.006em;
}

.authors {
  margin-top: 4px;
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.55;
}

.paper-meta {
  margin-top: 5px;
  color: var(--muted);
  font-size: 12.5px;
  line-height: 1.5;
}

.paper-meta a {
  color: var(--muted);
}

.paper-meta a:hover {
  color: var(--link-hover);
}

.paper-meta .venue {
  color: var(--link);
  font-weight: 650;
}

.sep {
  margin-inline: 3px;
  color: #c0c4c7;
}

/* ---------- Contact ---------- */

.contact {
  color: #444d54;
  font-size: 14px;
}

.secondary-links {
  display: flex;
  gap: 8px;
  margin-top: 12px;
  color: var(--faint);
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--rule);
}

.footer-inner {
  min-height: 82px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  color: var(--faint);
  font-size: 11.5px;
}

/* ---------- Mobile ---------- */

@media (max-width: 760px) {
  .shell {
    width: min(calc(100% - 30px), var(--shell));
  }

  .site-header {
    position: static;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }

  .header-inner {
    min-height: auto;
    padding: 14px 0;
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  .nav {
    gap: 14px;
    flex-wrap: wrap;
  }

  .intro {
    grid-template-columns: 1fr;
    gap: 28px;
    padding-top: 40px;
    padding-bottom: 42px;
  }

  .portrait-wrap {
    order: -1;
    width: 126px;
    height: 142px;
  }

  .intro h1 {
    font-size: 39px;
  }

  .lead {
    font-size: 17px;
  }

  .section {
    grid-template-columns: 1fr;
    gap: 18px;
    padding: 34px 0;
  }

  .section > h2,
  .section-title-row h2 {
    font-size: 21px;
  }

  .year-block {
    grid-template-columns: 1fr;
    gap: 11px;
  }

  .year {
    color: var(--text);
  }

  .footer-inner {
    min-height: auto;
    padding: 25px 0 34px;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
}

@media (max-width: 480px) {
  .section-title-row {
    align-items: flex-start;
    flex-direction: column;
    gap: 7px;
  }

  .news-row {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 12px;
  }
}

/* ---------- Reduced motion ---------- */

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