/* ---------------------------------------------------------------
   Wei Liu — site theme
   Same content and page structure as before; this file only
   controls presentation (colour, type, spacing, layout).
------------------------------------------------------------------ */

:root {
  --bg: #f7f7f7;
  --surface: #6f97c2;
  --ink: #1e1e1e;
  --ink-soft: #4a4a4a;
  --accent: #a43f49;
  --accent-soft: #f4e4e6;
  --rule: #e2e2e2;
  --focus: #a43f49;
  --link: #1a3a6b;
  --bar: #1d4ed8;
  --sidebar-width: 380px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17191b;
    --surface: #2c4560;
    --ink: #f2f2f2;
    --ink-soft: #a8a8a8;
    --accent: #d17b83;
    --accent-soft: #34181b;
    --rule: #2a2d2f;
    --focus: #d17b83;
    --link: #6fa3d8;
    --bar: #3b82f6;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Inter", -apple-system, "Segoe UI", system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--link);
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

h3 {
  position: relative;
  font-family: "Source Serif 4", Georgia, serif;
  font-weight: 600;
  font-size: 26px;
  color: var(--ink);
  margin: 0 0 20px;
  padding-top: 16px;
  letter-spacing: -0.01em;
}

h3::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 36px;
  height: 3px;
  border-radius: 2px;
  background: var(--bar);
}

p {
  margin: 0 0 16px;
}

b,
strong {
  font-weight: 600;
  color: var(--ink);
}

em {
  font-style: italic;
  color: var(--ink-soft);
}

/* Empty structural spacer divs left over from the old template */
.section-heading {
  display: none;
}

/* ---------------------------------------------------------------
   Sidebar / navigation
------------------------------------------------------------------ */

.responsive-nav {
  position: relative;
}

.icon-btn {
  appearance: none;
  border: none;
  background: var(--surface);
  color: var(--ink);
  width: 42px;
  height: 42px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 0;
}

#menu-toggle {
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 30;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.12);
}

.i-bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
}
.i-bars::before,
.i-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
}
.i-bars::before {
  top: -6px;
}
.i-bars::after {
  top: 6px;
}

.i-close {
  position: relative;
  display: block;
  width: 16px;
  height: 16px;
}
.i-close::before,
.i-close::after {
  content: "";
  position: absolute;
  top: 7px;
  left: -1px;
  width: 18px;
  height: 2px;
  background: currentColor;
}
.i-close::before {
  transform: rotate(45deg);
}
.i-close::after {
  transform: rotate(-45deg);
}

#menu-close {
  margin-bottom: 18px;
}

.menu {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: min(86vw, 340px);
  background: var(--surface);
  padding: 20px 26px 32px;
  overflow-y: auto;
  z-index: 39;
  transform: translateX(-100%);
  transition: transform 0.25s ease;
  box-shadow: 1px 0 0 var(--rule), 4px 0 24px -8px rgba(20, 24, 20, 0.12);
  --ink: #000;
  --ink-soft: #000;
}

.menu.open {
  transform: translateX(0);
  box-shadow:
    1px 0 0 var(--rule),
    4px 0 24px -8px rgba(20, 24, 20, 0.12),
    0 0 0 2000px rgba(10, 12, 11, 0.35);
}

.menu .container {
  text-align: center;
}

.menu .image {
  display: none; /* empty in current content */
}

.author-content h4 {
  margin: 6px 0 10px;
  font-size: 21px;
}

.author-content h4 a {
  color: var(--ink);
  text-decoration: none;
}

.author-content p {
  font-size: 14.5px;
  color: var(--ink-soft);
  line-height: 1.6;
  text-align: center !important;
}

.author-content br {
  content: "";
}

.main-nav {
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--rule);
}

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

.main-menu li {
  margin: 0;
}

.main-menu a {
  display: block;
  padding: 9px 4px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--ink-soft);
  text-decoration: none;
  text-align: center;
  border-radius: 6px;
}

.main-menu a:hover {
  color: var(--ink);
}

.main-menu li.active a {
  color: var(--link);
  font-weight: 600;
}

.social-network {
  margin-top: 24px;
}

/* Desktop: persistent sidebar, no toggle needed */
@media (min-width: 960px) {
  #menu-toggle {
    display: none;
  }
  #menu-close {
    display: none;
  }
  .menu {
    position: fixed;
    width: var(--sidebar-width);
    transform: none;
    transition: none;
  }
}

/* ---------------------------------------------------------------
   Content
------------------------------------------------------------------ */

#page-wraper > .section {
  padding: 64px clamp(20px, 5vw, 64px);
  border-top: 1px solid var(--rule);
}

#page-wraper > .section:first-of-type {
  border-top: none;
  padding-top: 56px;
}

@media (min-width: 960px) {
  #page-wraper > .section {
    margin-left: var(--sidebar-width);
  }
}

.section .container {
  max-width: 1320px;
  margin: 0 auto;
}

.left-image-post .row {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  align-items: flex-start;
}

.left-image-post .col-md-3 {
  flex: 0 0 260px;
}

.left-image-post .col-md-8 {
  flex: 1 1 420px;
  min-width: 0;
}

.left-image img {
  width: 100%;
  max-width: 260px;
  border-radius: 14px;
  display: block;
}

.right-text p {
  color: var(--ink);
  font-size: 16.5px;
}

.right-text sup {
  color: var(--accent);
}

/* Publication / grant / code / team / ancestry lists */
.right-text ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.right-text ul ul {
  margin-top: 4px;
}

.right-text li {
  padding: 6px 0;
  font-size: 15.5px;
  line-height: 1.5;
}

.right-text li a {
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.right-text li a:hover {
  border-bottom-color: var(--link);
}

.right-text > p > b:only-child,
.right-text > p > strong:only-child {
  display: inline-block;
  margin-top: 18px;
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

/* ---------------------------------------------------------------
   Contact / footer section
------------------------------------------------------------------ */

.contact-me {
  padding-bottom: 90px !important;
}

.copyright-text p {
  color: var(--ink-soft);
  font-size: 13.5px;
}

/* ---------------------------------------------------------------
   Motion
------------------------------------------------------------------ */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .menu {
    transition: none;
  }
}