:root {
  --ink: #343a3d;
  --muted: #687276;
  --line: #d6d9da;
  --link: #315c70;
  --accent: #c45b16;
  --page-width: 1155px;
  --font: Arial, Helvetica, sans-serif;
}

* {
  box-sizing: border-box;
  letter-spacing: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: #ffffff;
  color: var(--ink);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.62;
}

body.menu-open {
  overflow: hidden;
}

a {
  color: var(--link);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

a:hover {
  color: var(--accent);
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid #8fc0cf;
  outline-offset: 3px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 10px;
  left: 10px;
  padding: 8px 12px;
  background: #ffffff;
  color: #111111;
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.hero {
  position: relative;
  min-height: 640px;
  overflow: hidden;
  color: #ffffff;
}

.hero-media,
.hero-shade {
  position: absolute;
  inset: 0;
}

.hero-media {
  background-image: url("assets/yuelu-academy-autumn.png");
  background-position: center bottom;
  background-size: cover;
}

.hero-shade {
  background: rgba(18, 27, 24, 0.64);
}

.site-header {
  position: absolute;
  z-index: 20;
  top: 0;
  right: 0;
  left: 0;
  color: #ffffff;
}

.header-inner {
  width: calc(100% - 56px);
  min-height: 64px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.wordmark {
  margin: 0;
  font-size: 18px;
  font-weight: 500;
}

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

.site-nav {
  display: flex;
  align-items: center;
  gap: 27px;
}

.site-nav a {
  position: relative;
  color: inherit;
  font-size: 15px;
  text-decoration: none;
}

.site-nav a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -7px;
  left: 0;
  height: 2px;
  background: currentColor;
  opacity: 0;
}

.site-nav a:hover::after,
.site-nav a.active::after {
  opacity: 1;
}

.menu-button {
  width: 42px;
  height: 42px;
  display: none;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 4px;
  background: transparent;
  color: inherit;
  cursor: pointer;
}

.menu-button svg {
  width: 24px;
  height: 24px;
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(calc(100% - 48px), var(--page-width));
  min-height: 640px;
  margin: 0 auto;
  padding: 80px 0 38px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 266px;
  align-items: start;
  gap: 72px;
}

.intro-copy {
  max-width: 810px;
  padding-top: 7px;
  font-size: 15px;
}

.intro-copy p {
  margin: 0 0 22px;
}

.intro-copy .intro-lead {
  margin-bottom: 27px;
  font-size: 18px;
  line-height: 1.7;
}

.intro-copy strong {
  font-weight: 650;
}

.hero a {
  color: #ffffff;
}

.placeholder {
  font-style: italic;
}

.hero-contact {
  margin-top: 2px;
}

.hero-contact p {
  margin: 0 0 4px;
}

.profile-photo {
  display: block;
  width: 266px;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  object-position: center;
  border: 1px solid rgba(255, 255, 255, 0.48);
}

.intro-note {
  width: min(calc(100% - 48px), var(--page-width));
  margin: 0 auto;
  padding: 34px 0 36px;
  text-align: center;
}

.intro-note > p:first-child {
  max-width: 1120px;
  margin: 0 auto 10px;
}

.research-statement {
  margin: 0;
  color: #111111;
  font-size: 23px;
}

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

.content-rule {
  width: min(calc(100% - 48px), var(--page-width));
  height: 1px;
  margin: 0 auto;
  background: var(--line);
}

.content-section {
  width: min(calc(100% - 48px), var(--page-width));
  margin: 0 auto;
  padding: 45px 8px 36px;
}

.content-section h2 {
  margin: 0 0 28px;
  color: #3f4c51;
  font-size: 39px;
  font-weight: 400;
  line-height: 1.2;
  text-align: center;
}

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

.awards-list li {
  margin: 0 0 10px;
}

.publications-section {
  padding-top: 48px;
  padding-bottom: 70px;
}

.publications-section > h2 {
  margin-bottom: 35px;
  text-align: left;
}

.publication-group {
  margin-bottom: 32px;
}

.publication-group h3 {
  margin: 0 0 12px;
  color: #273338;
  font-size: 21px;
  font-weight: 600;
}

.publication-list {
  margin: 0;
  padding-left: 28px;
  list-style-type: square;
}

.publication-list > li {
  margin: 0 0 17px;
  padding-left: 2px;
}

.publication-list p {
  margin: 0;
}

.publication-details {
  margin: 7px 0 0;
  padding-left: 22px;
}

.publication-details li {
  margin: 2px 0;
}

.site-footer {
  padding: 24px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}

.site-footer p {
  margin: 3px 0;
}

.site-header-solid {
  position: relative;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
  background: #ffffff;
}

.subpage-main {
  width: min(calc(100% - 48px), 980px);
  min-height: calc(100vh - 175px);
  margin: 0 auto;
  padding: 72px 0 90px;
}

.subpage-main h1 {
  margin: 0 0 42px;
  color: #3f4c51;
  font-size: 42px;
  font-weight: 400;
}

.subpage-main h2 {
  margin: 38px 0 13px;
  font-size: 23px;
  font-weight: 500;
}

.simple-list {
  margin: 0;
  padding-left: 24px;
}

.simple-list li {
  margin-bottom: 16px;
}

.simple-section {
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

.simple-section p {
  margin: 0 0 10px;
}

.notes-page {
  width: min(calc(100% - 48px), 780px);
  min-height: calc(100vh - 175px);
  margin: 0 auto;
  padding: 64px 0 96px;
}

.notes-body {
  position: relative;
  min-height: 100vh;
  background-color: #18211d;
  color: #eef2f0;
  background-image: url("assets/notes-blossom-background.png");
  background-repeat: no-repeat;
  background-position: center center;
  background-size: cover;
  background-attachment: fixed;
}

.notes-body::before {
  content: "";
  position: fixed;
  z-index: 0;
  inset: 0;
  background: rgba(18, 27, 24, 0.4);
  pointer-events: none;
}

.notes-body > :not(.skip-link) {
  position: relative;
  z-index: 1;
}

.notes-body .site-header-solid,
.notes-body .site-footer {
  border-color: rgba(255, 255, 255, 0.18);
  background: rgba(18, 27, 24, 0.8);
  color: #ffffff;
  backdrop-filter: blur(6px);
}

.notes-body .note-entry {
  border-color: rgba(255, 255, 255, 0.24);
}

.notes-article {
  min-width: 0;
  max-width: 780px;
}

.notes-section {
  margin-top: 46px;
  scroll-margin-top: 24px;
}

.notes-article > .notes-section:first-child {
  margin-top: 0;
}

.notes-section h2 {
  margin: 0 0 16px;
  color: #3f5661;
  font-size: 27px;
  font-weight: 600;
  line-height: 1.3;
}

.notes-section > p {
  margin: 0;
  max-width: 720px;
}

.notes-group {
  margin-top: 30px;
}

.notes-group h3 {
  margin: 0 0 12px;
  color: #3f4c51;
  font-size: 19px;
  font-weight: 600;
}

.note-entry {
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

.note-entry:last-child {
  border-bottom: 1px solid var(--line);
}

.note-entry h4 {
  margin: 0 0 8px;
  color: #3f5661;
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
}

.note-entry p {
  margin: 0;
  color: var(--muted);
}

.notes-body .notes-section h2,
.notes-body .notes-group h3,
.notes-body .note-entry h4 {
  color: #f4f7f5;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.28);
}

.notes-body .notes-section > p {
  color: #edf1ef;
}

.notes-body .note-entry p {
  color: #dce3df;
}

.notes-body .note-entry a {
  color: inherit;
}

.notes-body .note-entry a:hover {
  color: #ffffff;
  text-decoration-thickness: 2px;
}

.note-entry p + p {
  margin-top: 6px;
}

.notes-body .site-footer {
  color: rgba(255, 255, 255, 0.72);
}

@media (max-width: 900px) {
  .site-nav {
    gap: 17px;
  }

  .site-nav a {
    font-size: 13px;
  }

  .hero-content {
    grid-template-columns: minmax(0, 1fr) 220px;
    gap: 42px;
  }

  .profile-photo {
    width: 220px;
  }

}

@media (max-width: 720px) {
  .header-inner,
  .hero-content,
  .intro-note,
  .content-rule,
  .content-section,
  .subpage-main {
    width: calc(100% - 32px);
  }

  .header-inner {
    min-height: 64px;
  }

  .wordmark {
    font-size: 17px;
  }

  .menu-button {
    display: inline-flex;
  }

  .site-nav {
    position: fixed;
    z-index: 30;
    top: 64px;
    right: 0;
    left: 0;
    height: calc(100svh - 64px);
    padding: 28px 24px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    visibility: hidden;
    opacity: 0;
    background: #ffffff;
    color: var(--ink);
    transform: translateY(-8px);
    transition: opacity 150ms ease, transform 150ms ease, visibility 150ms ease;
  }

  .site-nav.is-open {
    visibility: visible;
    opacity: 1;
    transform: translateY(0);
  }

  .site-nav a {
    width: 100%;
    padding: 14px 0;
    border-bottom: 1px solid var(--line);
    font-size: 21px;
  }

  .site-nav a::after {
    display: none;
  }

  /* .hero a sits later in this file with the same specificity, so it repainted
     the open menu's links white on the white panel. */
  .hero .site-nav a {
    color: inherit;
  }

  /* .notes-body > :not(.skip-link) puts the header and <main> on the same
     stacking level; <main> comes later, so the fixed menu panel was painted
     underneath the page content. */
  .notes-body > .site-header {
    z-index: 40;
  }

  .hero {
    min-height: 0;
  }

  .hero-content {
    min-height: 0;
    padding: 88px 0 38px;
    display: flex;
    flex-direction: column;
  }

  .intro-copy {
    max-width: none;
    padding: 0;
    font-size: 14px;
    line-height: 1.55;
  }

  .intro-copy .intro-lead {
    margin-bottom: 17px;
    font-size: 16px;
    line-height: 1.58;
  }

  .intro-copy p {
    margin-bottom: 15px;
  }

  .hero-contact {
    max-width: none;
  }

  .profile-photo {
    position: static;
    align-self: center;
    width: 150px;
    margin-top: 18px;
    aspect-ratio: 3 / 4;
  }

  .intro-note {
    padding: 30px 0 32px;
  }

  .research-statement {
    font-size: 20px;
  }

  .content-section {
    padding-right: 0;
    padding-left: 0;
  }

  .content-section h2 {
    font-size: 34px;
  }

  .publication-list {
    padding-left: 23px;
  }

  .publication-details {
    padding-left: 17px;
  }

  .subpage-main {
    padding: 48px 0 70px;
  }

  .subpage-main h1 {
    margin-bottom: 32px;
    font-size: 36px;
  }

  .notes-page {
    width: calc(100% - 32px);
    padding: 44px 0 70px;
  }

  .notes-body {
    background-position: center top;
    background-attachment: scroll;
  }

  .notes-body .site-nav {
    /* opaque: at 0.97 the page text behind stayed legible through the panel */
    background: #18211d;
    color: #ffffff;
  }

  .notes-body .site-nav a {
    border-bottom-color: rgba(255, 255, 255, 0.2);
  }

  .notes-section {
    margin-top: 40px;
  }

  .notes-section h2 {
    font-size: 24px;
  }
}

@media (max-width: 360px) {
  .hero-content {
    padding-bottom: 32px;
  }

  .profile-photo {
    width: 132px;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}