:root {
  color-scheme: light;
  --body-bg: #e5e7eb;
  --card-bg: #ffffff;
  --text: #23262d;
  --muted: #5a6270;
  --link: #174ea6;
  --link-hover: #0b3478;
  --border: rgba(15, 23, 42, 0.12);
  --focus: #b45309;
  --shadow: 0 8px 24px rgba(15, 23, 42, 0.07);
  --highlight-bg: #fff8e6;
  --highlight-text: #70530a;
  --highlight-border: #f2ce73;
  --award-bg: #e8f5e9;
  --award-text: #246529;
  --award-border: #9ccc9f;
  --content-width: 790px;
  --radius: 10px;
  --mono: ui-monospace, Menlo, Monaco, "Cascadia Mono", "Segoe UI Mono", "Roboto Mono", "Oxygen Mono", "Ubuntu Mono", "Source Code Pro", "Fira Mono", "Droid Sans Mono", Consolas, "Courier New", monospace;
}

[data-theme="dark"] {
  color-scheme: dark;
  --body-bg: #111318;
  --card-bg: #25282f;
  --text: #f0f2f5;
  --muted: #bdc4cf;
  --link: #91b7ff;
  --link-hover: #c0d6ff;
  --border: rgba(255, 255, 255, 0.13);
  --focus: #fbbf24;
  --shadow: 0 8px 28px rgba(0, 0, 0, 0.24);
  --highlight-bg: #332e00;
  --highlight-text: #ffe278;
  --highlight-border: #76680a;
  --award-bg: #19311f;
  --award-text: #8dd893;
  --award-border: #396d41;
}

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

html {
  min-width: 0;
  background: var(--body-bg);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 0;
  overflow-x: hidden;
  background: var(--body-bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.5;
  transition: background-color 0.25s ease, color 0.25s ease;
}

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

a {
  color: var(--link);
  font-weight: 600;
  text-decoration: none;
}

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

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  border-radius: 4px;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0.5rem;
  font-size: clamp(2rem, 7vw, 2.125rem);
  line-height: 1.18;
}

h2 {
  margin-bottom: 0.75rem;
  font-size: 1.25rem;
  line-height: 1.3;
}

h3 {
  margin: 1.5rem 0 0.65rem;
  font-size: 1.05rem;
  line-height: 1.4;
}

.mono-font {
  font-family: var(--mono);
}

.site-shell {
  width: min(var(--content-width), calc(100% - 32px));
  margin: 20px auto;
}

.card {
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card-bg);
  box-shadow: var(--shadow);
  transition: background-color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--card-bg);
  box-shadow: var(--shadow);
  transform: translateY(-150%);
}

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

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

.site-header {
  padding-block: 14px;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 20px;
}

.nav-links a {
  padding: 4px 0;
  font-family: var(--mono);
  font-size: 1rem;
  font-weight: 700;
}

.nav-links a[aria-current="page"] {
  color: var(--link-hover);
}

.theme-toggle {
  position: relative;
  flex: 0 0 44px;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 2px solid var(--border);
  border-radius: 50%;
  background: var(--card-bg);
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
}

.theme-toggle:hover {
  border-color: var(--link);
  transform: translateY(-1px);
}

.theme-icon {
  position: absolute;
  inset: 8px;
  width: 24px;
  height: 24px;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.theme-icon.moon {
  opacity: 0;
  transform: rotate(-35deg);
}

[data-theme="dark"] .theme-icon.sun {
  opacity: 0;
  transform: rotate(35deg);
}

[data-theme="dark"] .theme-icon.moon {
  opacity: 1;
  transform: rotate(0);
}

.profile-card {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  align-items: center;
  gap: 44px;
}

.profile-photo {
  width: 250px;
  height: auto;
  border-radius: 10px;
}

.profile-role {
  line-height: 1.55;
}

.profile-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.news-list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.news-list li {
  display: grid;
  grid-template-columns: 104px minmax(0, 1fr);
  gap: 14px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}

.news-list li:last-child {
  border-bottom: 0;
}

.news-list time {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.92rem;
}

.news-list p {
  margin: 0;
}

.page-intro p:last-child,
.site-footer p:last-child,
.research-content > p:last-child {
  margin-bottom: 0;
}

.research-direction {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px;
  line-height: 1.45;
}

.research-image {
  width: 95%;
  height: 300px;
  margin: 0 auto 20px;
  border-radius: 8px;
  background: #ffffff;
  object-fit: contain;
}

.research-content {
  width: 95%;
}

.research-content h2 {
  margin: 0 0 10px;
  font-size: 1.125rem;
  line-height: 1.35;
}

.research-content > p {
  margin-bottom: 15px;
  line-height: 1.5;
  text-align: justify;
}

.research-accent {
  color: var(--link);
  font-family: "Rock Salt", cursive;
  font-size: 0.92em;
}

.research-groups {
  margin-top: 15px;
  font-size: 0.875rem;
  line-height: 1.45;
}

.research-groups h3 {
  margin: 8px 0;
  font-size: 0.875rem;
  line-height: 1.4;
  font-style: italic;
}

.research-paper-list {
  margin: 5px 0 20px;
  padding-left: 20px;
}

.research-paper-list li {
  margin-bottom: 5px;
}

.research-paper-title {
  font-weight: 700;
}

.research-authors {
  color: inherit;
}

.short-bio p {
  text-align: justify;
  text-justify: inter-word;
}

.software-project {
  padding: 20px;
}

.software-hero {
  margin: 20px 0 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #ffffff;
}

.software-hero img {
  width: 100%;
  height: auto;
}

.software-heading {
  display: block;
}

.software-logo-title {
  margin: 0;
}

.software-logo {
  width: clamp(220px, 42vw, 320px);
  height: auto;
}

.software-logo-dark {
  display: none;
}

[data-theme="dark"] .software-logo-light {
  display: none;
}

[data-theme="dark"] .software-logo-dark {
  display: block;
}

.software-tagline {
  margin: 6px 0 0;
  color: var(--muted);
}

.software-actions ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.software-action-link {
  display: inline-block;
  padding: 8px 13px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg);
}

.software-action-link:hover {
  border-color: var(--link);
}

.publication-section {
  padding: 20px;
}

.publication-section h2 {
  margin: 0;
  font-size: 1.25rem;
}

.publication-section h3 {
  margin: 20px 0 10px;
  color: var(--muted);
  font-size: 1.125rem;
}

.publication-list {
  margin: 0;
  padding-left: 1.65rem;
  font-size: 0.8125rem;
  line-height: 1.45;
}

.publication-list li {
  margin-bottom: 12px;
  padding-left: 0.15rem;
  text-align: left;
}

.publication-links {
  white-space: normal;
}

.pub-note {
  display: inline-block;
  margin: 3px 0 0 4px;
  padding: 1px 5px;
  border: 1px solid;
  border-radius: 5px;
  font-size: 0.84em;
  font-weight: 600;
  line-height: 1.5;
}

.pub-note.highlight {
  border-color: var(--highlight-border);
  background: var(--highlight-bg);
  color: var(--highlight-text);
}

.pub-note.award {
  border-color: var(--award-border);
  background: var(--award-bg);
  color: var(--award-text);
}

.site-footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.88rem;
}

.site-footer p {
  margin-bottom: 0.25rem;
}

.error-page {
  padding-block: 48px;
  text-align: center;
}

.error-code {
  margin-bottom: 0;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 3rem;
  font-weight: 800;
}

.button-link {
  display: inline-block;
  padding: 9px 14px;
  border-radius: 8px;
  background: var(--link);
  color: #ffffff;
  font-weight: 700;
  text-decoration: none;
}

.button-link:hover {
  background: var(--link-hover);
  color: #ffffff;
}

.js.animations-ready .scroll-reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.js.animations-ready .scroll-reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 700px) {
  .profile-card {
    grid-template-columns: 1fr;
    gap: 24px;
    text-align: center;
  }

  .profile-photo {
    width: min(220px, 70vw);
    margin-inline: auto;
  }

  .profile-links {
    justify-content: center;
  }

  .research-direction {
    padding: 20px;
  }

  .research-image,
  .research-content {
    width: 100%;
  }

}

@media (max-width: 520px) {
  .site-shell {
    width: min(var(--content-width), calc(100% - 20px));
    margin-block: 10px;
  }

  .card {
    padding: 16px;
    border-radius: 10px;
  }

  .site-header {
    padding-block: 10px;
  }

  .site-nav {
    align-items: flex-start;
  }

  .nav-links {
    gap: 6px 14px;
  }

  .nav-links a {
    font-size: 0.94rem;
  }

  .theme-toggle {
    flex-basis: 40px;
    width: 40px;
    height: 40px;
  }

  .theme-icon {
    inset: 6px;
  }

  .news-list li {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .research-direction {
    padding: 16px;
  }

  .research-content > p {
    text-align: left;
  }

  .short-bio p {
    text-align: left;
  }

  .publication-list {
    padding-left: 1.35rem;
    font-size: 0.9rem;
  }

  .software-project {
    padding: 16px;
  }

  .software-actions a {
    width: 100%;
    text-align: center;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .js.animations-ready .scroll-reveal {
    opacity: 1;
    transform: none;
  }
}

@media print {
  :root,
  [data-theme="dark"] {
    --body-bg: #ffffff;
    --card-bg: #ffffff;
    --text: #000000;
    --muted: #333333;
    --link: #000000;
    --border: #cccccc;
    --shadow: none;
  }

  .site-header,
  .site-footer,
  .skip-link {
    display: none;
  }

  .site-shell {
    width: 100%;
    margin: 0 0 12px;
  }
}