:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --surface-alt: #eef3ff;
  --text: #1e2433;
  --text-muted: #5b6378;
  --border: #d6ddec;
  --divider: #cfd8ea;
  --link: #245bd6;
  --link-hover: #173f9c;
  --nav-bg: #ffffff;
  --nav-link: #2b3550;
  --nav-link-muted: #5f6b86;
  --nav-link-hover: #245bd6;
  --footer-bg: #1f2a44;
  --footer-text: #f1f5ff;
  --shadow: 0 10px 30px rgba(15, 25, 44, 0.08);
}

html[data-theme="dark"] {
  --bg: #111214;
  --surface: #181a1d;
  --surface-alt: #202327;
  --text: #e6e8eb;
  --text-muted: #adb3bc;
  --border: #2f343b;
  --divider: #3a4048;
  --link: #f3e6a1;
  --link-hover: #fff3bf;
  --nav-bg: #181a1d;
  --nav-link: #e6e8eb;
  --nav-link-muted: #adb3bc;
  --nav-link-hover: #d2d9e3;
  --footer-bg: #131417;
  --footer-text: #c9ced6;
  --shadow: 0 8px 20px rgba(0, 0, 0, 0.45);
}

html,
body {
  background: var(--bg);
  color: var(--text);
}

body {
  transition: background-color 0.2s ease, color 0.2s ease;
}

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

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

.masthead {
  background: var(--nav-bg);
  border-bottom: 1px solid var(--border);
}

.masthead__inner-wrap {
  padding: 0.45rem 0.75rem;
}

.greedy-nav {
  background: transparent;
}

.greedy-nav a {
  color: var(--nav-link-muted);
}

.greedy-nav .visible-links a {
  color: var(--nav-link);
}

.greedy-nav .visible-links a:hover {
  color: var(--nav-link-hover);
}

.greedy-nav .visible-links a:before {
  background: var(--nav-link-hover);
}

.greedy-nav button {
  background: var(--surface-alt);
  color: var(--text);
  border-left: 1px solid var(--border);
}

.greedy-nav .hidden-links {
  border-color: var(--border);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.greedy-nav .hidden-links a {
  color: var(--text);
}

.greedy-nav .hidden-links a:hover {
  color: var(--link);
  background: var(--surface-alt);
}

.greedy-nav .hidden-links:before {
  border-color: var(--border) transparent;
}

.greedy-nav .hidden-links:after {
  border-color: var(--surface) transparent;
}

.author__urls,
.author__urls_sm {
  color: var(--text);
}

.author__urls a,
.author__urls_sm a {
  color: inherit;
}

.author__urls a:hover,
.author__urls_sm a:hover {
  color: var(--link);
}

.author__urls.social-icons .fa,
.author__urls.social-icons .fas,
.author__urls.social-icons .fab,
.author__urls.social-icons .far,
.author__urls.social-icons .ai,
.author__urls_sm .fa,
.author__urls_sm .fas,
.author__urls_sm .fab,
.author__urls_sm .far,
.author__urls_sm .ai {
  color: currentColor;
}

.inline-school-icon {
  width: 1em;
  height: 1em;
  margin-right: 0.25em;
  vertical-align: -0.15em;
  object-fit: contain;
}

.page__content,
.page__content p,
.page__content li,
.page__content h1,
.page__content h2,
.page__content h3,
.page__content h4 {
  color: var(--text);
}

.page__content h1 {
  border-bottom-color: var(--divider);
}

hr {
  border-top-color: var(--divider);
}

html[data-theme="dark"] .page__share,
html[data-theme="dark"] .page__related,
html[data-theme="dark"] .page__comments-title,
html[data-theme="dark"] .page__content + .pagination,
html[data-theme="dark"] .page__meta + .pagination,
html[data-theme="dark"] .page__share + .pagination,
html[data-theme="dark"] .page__comments + .pagination {
  border-top-color: var(--divider);
}

.paper-box {
  border-bottom-color: var(--border);
}

.paper-box .paper-box-image > div {
  position: relative;
  padding: 0.4rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: linear-gradient(180deg, #fdfdff 0%, #f4f7ff 100%);
  box-shadow: 0 8px 22px rgba(15, 25, 44, 0.12);
}

.paper-box .paper-box-image img {
  display: block;
  position: relative;
  z-index: 1;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #ffffff;
  box-shadow: 0 6px 16px rgba(15, 25, 44, 0.16);
}

.paper-box .paper-box-image > div > .badge,
.paper-box .paper-box-image > div > .redbadge,
.paper-box .paper-box-image > div > .graybadge,
.paper-box .paper-box-image > div > .greenbadge {
  position: absolute;
  top: 0.58rem;
  left: 0.58rem;
  z-index: 5;
  display: inline-flex;
  align-items: center;
  gap: 0.38rem;
  margin: 0;
  padding: 0.24rem 0.72rem;
  border-radius: 999px;
  border: 1px solid transparent;
  color: #ffffff;
  font-size: 0.74rem;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: 0.01em;
  box-shadow: 0 6px 14px rgba(7, 12, 24, 0.26);
}

.paper-box .paper-box-image > div > .badge::before,
.paper-box .paper-box-image > div > .redbadge::before,
.paper-box .paper-box-image > div > .graybadge::before,
.paper-box .paper-box-image > div > .greenbadge::before {
  display: inline-block;
  font-family: "Font Awesome 5 Free";
  font-size: 0.72rem;
  font-weight: 900;
  line-height: 1;
}

/* Blue = Conference */
.paper-box .paper-box-image > div > .badge {
  background: #1f57c8;
  border-color: #2e6adf;
}

.paper-box .paper-box-image > div > .badge::before {
  content: "\f073";
}

/* Red = Journal/Transactions */
.paper-box .paper-box-image > div > .redbadge {
  background: #a11d1d;
  border-color: #bf2e2e;
}

.paper-box .paper-box-image > div > .redbadge::before {
  content: "\f02d";
}

/* Gray = Preprint (keep greenbadge as backward-compatible alias) */
.paper-box .paper-box-image > div > .graybadge,
.paper-box .paper-box-image > div > .greenbadge {
  background: #5b6674;
  border-color: #6f7c8b;
}

.paper-box .paper-box-image > div > .graybadge::before,
.paper-box .paper-box-image > div > .greenbadge::before {
  content: "\f15c";
}

.paper-box .paper-box-image img.paper-preview {
  background: #fbfdff;
}

.paper-box .paper-box-image img.preview-invert {
  filter: none;
}

html[data-theme="dark"] .paper-box .paper-box-image > div {
  border-color: #3b4350;
  background: linear-gradient(180deg, #21262d 0%, #1a1f25 100%);
  box-shadow: 0 10px 22px rgba(0, 0, 0, 0.38);
}

html[data-theme="dark"] .paper-box .paper-box-image > div > .badge,
html[data-theme="dark"] .paper-box .paper-box-image > div > .redbadge,
html[data-theme="dark"] .paper-box .paper-box-image > div > .graybadge,
html[data-theme="dark"] .paper-box .paper-box-image > div > .greenbadge {
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.45);
}

html[data-theme="dark"] .paper-box .paper-box-image img {
  border-color: #4a535e;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.34);
}

html[data-theme="dark"] .paper-box .paper-box-image img.paper-preview {
  filter: brightness(0.97) saturate(0.88) contrast(0.98);
}

html[data-theme="dark"] .paper-box .paper-box-image img.preview-invert {
  filter: grayscale(1) invert(1) hue-rotate(180deg) contrast(1.02);
}

.theme-toggle {
  position: fixed;
  left: 18px;
  right: auto;
  bottom: 18px;
  z-index: 1200;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 999px;
  width: 2.55rem;
  height: 2.55rem;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
  box-shadow: var(--shadow);
}

.theme-toggle:hover {
  border-color: var(--link);
}

.theme-toggle i {
  pointer-events: none;
}

.author__avatar img {
  transition: filter 0.2s ease, opacity 0.2s ease;
}

html[data-theme="dark"] .author__avatar img {
  filter: brightness(0.86) saturate(0.82) contrast(0.97);
}

#live2d-widget,
#live2dcanvas,
.live2d-widget-container {
  transition: filter 0.2s ease, opacity 0.2s ease;
}

html[data-theme="dark"] #live2d-widget,
html[data-theme="dark"] #live2dcanvas,
html[data-theme="dark"] .live2d-widget-container {
  filter: brightness(0.84) saturate(0.8) contrast(0.97);
  opacity: 0.94;
}

/* Standalone pages */
body.standalone-page {
  font-family: "Roboto", sans-serif;
  line-height: 1.6;
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

body.standalone-page #main {
  max-width: none;
  width: 100%;
  margin-top: 0;
  padding: 0;
}

body.standalone-page .page {
  float: none;
  width: 100%;
  max-width: none;
  margin: 0;
  padding: 0;
}

body.standalone-page .page__inner-wrap,
body.standalone-page .page__content {
  width: 100%;
  max-width: none;
  margin: 0;
}

body.standalone-page .page__content {
  padding: 0;
}

.standalone-container {
  width: min(1200px, 90vw);
  margin: 0 auto;
}

.page-header {
  background: linear-gradient(135deg, var(--surface-alt), var(--surface));
  border-bottom: 1px solid var(--border);
  padding: 40px 0 30px;
}

.page-subtitle {
  color: var(--text-muted);
}

.header-inner,
.footer-inner {
  width: min(1200px, 90vw);
  margin: 0 auto;
  text-align: center;
}

body.standalone-page .page-footer {
  background: transparent;
  color: var(--text-muted);
  border-top: 1px solid var(--divider);
  padding: 16px 0 20px;
  margin-top: 28px;
  font-size: 0.92rem;
}

body.standalone-page .page-footer p {
  margin: 0;
  text-align: center;
}

/* Gallery page */
body.gallery-page .gallery-container {
  width: min(1200px, 90vw);
  margin: 24px auto 0;
  padding: 30px;
  flex: 1 0 auto;
  text-align: center;
  background: var(--surface);
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

body.gallery-page .gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
}

body.gallery-page .gallery-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.45s ease, transform 0.45s ease;
}

body.gallery-page .gallery-item.is-visible {
  opacity: 1;
  transform: translateY(0);
}

body.gallery-page .gallery a {
  display: block;
  position: relative;
  overflow: hidden;
  border-radius: 8px;
  width: 100%;
  padding-top: 100%;
  box-shadow: 0 3px 6px rgba(0, 0, 0, 0.15);
}

body.gallery-page .gallery img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease-out;
}

body.gallery-page .gallery img:hover {
  transform: scale(1.08);
}

body.gallery-page .caption {
  font-size: 0.9em;
  color: var(--text-muted);
  margin-top: 8px;
}

.site-button,
.button {
  display: inline-block;
  padding: 12px 24px;
  margin: 24px 12px 0;
  border-radius: 8px;
  background: var(--surface-alt);
  color: var(--text);
  border: 1px solid var(--border);
  cursor: pointer;
  font-size: 1rem;
}

.site-button:hover,
.button:hover {
  border-color: var(--link);
}

.site-button:disabled,
.button:disabled,
.button[disabled] {
  opacity: 0.6;
  cursor: default;
}

/* Notes page */
body.notes-page .container {
  width: min(900px, 90vw);
  margin: 0 auto;
  padding: 20px;
}

body.notes-page h1,
body.notes-page h2 {
  text-align: center;
}

body.notes-page h3 {
  color: var(--text-muted);
}

body.notes-page .highlight-quote,
body.notes-page .project {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow);
}

body.notes-page .highlight-quote {
  border-left: 4px solid var(--link);
  margin: 20px 0 40px;
  padding: 20px 25px;
  font-style: italic;
}

body.notes-page .highlight-quote cite {
  display: block;
  margin-top: 10px;
  font-style: normal;
  color: var(--text-muted);
  text-align: right;
}

body.notes-page .project {
  padding: 15px;
  margin: 20px 0;
}

#site-visit-widget {
  margin: 0 auto 2rem;
  text-align: center;
}

#site-visit-widget iframe,
#site-visit-widget img,
#site-visit-widget canvas,
#site-visit-widget svg,
#site-visit-widget > div {
  margin: 0 auto;
  max-width: 100%;
}

@media (prefers-reduced-motion: reduce) {
  body.gallery-page .gallery-item,
  body.gallery-page .gallery img,
  .site-button,
  .button {
    transition: none;
  }
}