:root {
  color-scheme: light;
  --bg: #f7f9fc;
  --surface: #fff;
  --text: #15263e;
  --muted: #60728b;
  --line: #e0e8f2;
  --accent: #155baf;
  --soft: #e9f2fd;
  --sidebar: 256px;
  font-family: Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  font-synthesis: none;
  --banner-tint: linear-gradient(110deg,rgba(246,250,255,.12),rgba(246,250,255,.08));
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: auto;
  scroll-padding-top: 24px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

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

button, input, select, textarea {
  font: inherit;
}

button, a, input, select, textarea {
  -webkit-tap-highlight-color: transparent;
}

button {
  cursor: pointer;
}

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

[data-theme=dark] {
  color-scheme: dark;
  --bg: #0b1424;
  --surface: #111e32;
  --text: #edf4ff;
  --muted: #a6b8cf;
  --line: #283b55;
  --accent: #7bb6ff;
  --soft: #172d4c;
  --banner-tint: linear-gradient(110deg,rgba(4,17,38,.24),rgba(4,17,38,.16));
}

.shell {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--sidebar);
  height: 100vh;
  flex: none;
  border-right: 1px solid var(--line);
  padding: 32px 20px 4px;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  overflow-y: auto;
}

.brand {
  display: flex;
  align-items: center;
  flex: none;
  min-height: 52px;
  margin-bottom: 48px;
}

.nav {
  display: grid;
  gap: 5px;
}

.nav a {
  display: block;
  padding: 11px 13px;
  border-radius: 10px;
  font-size: 14px;
  transition: background .2s;
}

.nav a:hover, .nav a[aria-current="page"] {
  background: var(--soft);
}

.nav a[aria-current] {
  color: var(--accent);
  font-weight: 650;
}

.sidebar-bottom {
  display: flex;
  justify-content: center;
  margin-top: auto;
  padding-top: 8px;
  border-top: 1px solid var(--line);
}

.page {
  min-width: 0;
  flex: 1;
  margin-left: var(--sidebar);
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
}

.page .topbar {
  display: none;
  border: 0;
}

.icon-button {
  border: 0;
  background: none;
  color: var(--text);
  font-size: 23px;
  padding: 5px;
}

.menu-button, .mobile-brand {
  display: none;
}

.content {
  max-width: 1600px;
  margin: auto;
  padding: 0 clamp(30px,5vw,96px);
}

.eyebrow {
  color: var(--accent);
  font-size: 11px;
  letter-spacing: .2em;
  font-weight: 700;
}

.submit-intro h1 {
  letter-spacing: -.045em;
  line-height: 1.27;
  font-weight: 500;
  font-family: Georgia,"Songti SC",serif;
  font-size: clamp(30px,3.6vw,44px);
  margin: 10px 0;
}

.submit-intro h1 em {
  color: var(--accent);
  font-style: normal;
}

.lead {
  font-size: clamp(15px,1.4vw,18px);
  color: var(--muted);
  max-width: 600px;
}

.text-link {
  display: inline-block;
  color: var(--accent);
  font-weight: 650;
  font-size: 14px;
  margin-top: 22px;
}

.section {
  padding: 75px 0;
}

.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 20px;
  margin-bottom: 30px;
}

.section-heading h2 {
  font-family: Georgia,"Songti SC",serif;
  font-size: 30px;
  font-weight: 500;
  margin: 8px 0 0;
}

.section-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
}

.section-actions>p {
  font-size: 13px;
  color: var(--muted);
  margin: 0;
}

.year-select select, .field input, .field select, .field textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  border-radius: 9px;
  padding: 12px 14px;
  outline: none;
}

.year-select select:focus, .field input:focus, .field select:focus, .field textarea:focus {
  border-color: var(--accent);
}

.search-open {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: none;
  min-width: 0;
  min-height: 40px;
  padding: 8px 0;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 13px;
  text-align: left;
  cursor: pointer;
}

.search-open:hover, .search-open:focus-visible {
  color: var(--accent);
}

.search-label {
  white-space: nowrap;
}

.search-open kbd {
  font: inherit;
  font-size: 11px;
}

.search-dialog {
  position: fixed;
  top: var(--search-top, 132px);
  left: 50%;
  transform: translateX(-50%);
  width: min(460px, calc(100% - 32px));
  max-height: min(580px, var(--search-available, calc(100dvh - var(--search-top, 132px) - 16px)));
  margin: 0;
  padding: 0;
  border: 1px solid color-mix(in srgb, var(--text) 10%, transparent);
  border-radius: 14px;
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 16px 48px rgba(18,19,23,.14);
  overflow: hidden;
}

.search-dialog[open] {
  display: flex;
  flex-direction: column;
}

.search-dialog::backdrop {
  background: rgba(18,19,23,.3);
}

.search-field {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: none;
  min-height: 54px;
  padding: 0 14px;
}

.search-field svg {
  flex: none;
  color: var(--muted);
}

.search-field input {
  flex: 1;
  min-width: 0;
  height: 54px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 16px;
}

.search-field input:focus {
  outline: none;
}

.search-field input::placeholder {
  color: var(--muted);
}

.search-field input::-webkit-search-cancel-button {
  display: none;
}

.search-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 36px;
  flex: none;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--muted);
  font: 24px/1 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  cursor: pointer;
}

.search-close:hover, .search-close:focus-visible {
  color: var(--text);
  background: var(--surface);
}

#search-results {
  min-height: 0;
  overflow-y: auto;
  scrollbar-width: none;
  border-top: 1px solid var(--line);
}

#search-results:empty {
  display: none;
}

#search-results::-webkit-scrollbar {
  display: none;
}

.search-dialog:not(:has(#search-results ul)) .scroll-hint {
  display: none;
}

.scroll-hint {
  display: flex;
  justify-content: center;
  align-items: center;
  flex: none;
  height: 20px;
  color: var(--muted);
  visibility: hidden;
}

.scroll-hint.is-visible {
  visibility: visible;
}

.scroll-hint::before {
  content: "";
  width: 7px;
  height: 7px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg);
}

.scroll-hint.is-visible::before {
  animation: scroll-hint 1.4s ease-in-out infinite;
}

@keyframes scroll-hint {
  50% { transform: translateY(3px) rotate(45deg); }
}

#search-results:not(:empty) {
  padding: 10px 16px;
  color: var(--muted);
  font-size: 13px;
}

.search-summary {
  padding: 2px 2px 8px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 600;
}

#search-results ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

#search-results li+li {
  border-top: 1px solid var(--line);
}

#search-results li a {
  display: block;
  padding: 10px 2px;
  border-radius: 8px;
  color: var(--text);
  font-size: 15px;
  line-height: 1.5;
}

.search-title {
  display: block;
  font-weight: 600;
}

#search-results li a:hover, #search-results li a:focus-visible {
  color: var(--accent);
}

.search-match {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow: hidden;
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 400;
  overflow-wrap: anywhere;
}

#search-results mark {
  background: transparent;
  color: var(--accent);
  font-weight: 700;
}

.year-select {
  position: relative;
  display: inline-flex;
  flex: none;
  width: max-content;
  min-width: 0;
}

.year-select select {
  appearance: none;
  -webkit-appearance: none;
  width: auto;
  max-width: none;
  padding: 10px 35px 10px 13px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 550;
  border-radius: 9px;
}

.year-select>svg {
  display: none;
}

.year-select.has-popover select {
  display: none;
}

.year-trigger {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  width: auto;
  min-height: 44px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-size: 14px;
  font-weight: 550;
  cursor: pointer;
}

.year-trigger[hidden] {
  display: none;
}

.year-trigger svg {
  width: 16px;
  height: 16px;
  flex: none;
  color: var(--muted);
}

.year-trigger:hover, .year-trigger:focus-visible {
  border-color: var(--accent);
  outline: none;
}

.year-options[popover] {
  position: fixed;
  inset: auto;
  min-width: 0;
  max-height: min(280px,60vh);
  overflow-y: auto;
  padding: 5px;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 12px 30px rgba(8,28,55,.16);
}

.year-option {
  display: block;
  width: 100%;
  padding: 9px 12px;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: inherit;
  text-align: left;
  font: inherit;
  font-size: 14px;
  white-space: nowrap;
  cursor: pointer;
}

.year-option:hover, .year-option:focus-visible {
  background: var(--soft);
  outline: none;
}

.year-option.is-selected {
  background: var(--soft);
  color: var(--accent);
  font-weight: 650;
}

.article-item {
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.article-item h3 {
  font-size: 20px;
  margin: 4px 0;
}

.article-item h3 a:hover {
  color: var(--accent);
}

.article-meta {
  color: var(--muted);
  font-size: 13px;
  margin: 0;
}

.empty-state {
  text-align: center;
  padding: 65px 15px;
  background: var(--surface);
  border: 1px dashed var(--line);
  border-radius: 14px;
}

.empty-state h3 {
  font-family: Georgia,"Songti SC",serif;
  font-size: 23px;
  font-weight: 500;
}

.empty-state p {
  font-size: 14px;
  color: var(--muted);
}

.submit-intro {
  max-width: 820px;
  margin-inline: auto;
  padding: 42px 0 24px;
}

.form-wrap {
  max-width: 820px;
  padding: 0;
  margin-bottom: 76px;
  margin-inline: auto;
  color: var(--text);
}

.notice {
  background: var(--soft);
  padding: 14px 16px;
  border-radius: 11px;
  margin-bottom: 22px;
  font-size: 13px;
  line-height: 1.7;
}

.notice p {
  margin: 5px 0 0;
  color: var(--muted);
}

.field {
  display: grid;
  gap: 8px;
  margin-bottom: 24px;
}

.education-fields {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  align-items: start;
  min-width: 0;
  margin: 0 0 24px;
  padding: 0;
  border: 0;
}

.education-fields legend {
  padding: 0 0 16px;
  color: var(--text);
  font-size: 14px;
  font-weight: 700;
}

.education-fields .field {
  margin-bottom: 0;
  align-self: start;
}

.field label {
  font-size: 14px;
  font-weight: 600;
}

.field textarea {
  display: block;
  width: 100%;
  height: auto;
  field-sizing: content;
  resize: vertical;
  line-height: 1.75;
  min-height: 110px;
  overflow-y: auto;
}

.input-suffix {
  display: flex;
  align-items: center;
  gap: 12px;
}

.input-suffix input {
  width: 8ch;
  max-width: 100px;
  padding: 12px;
  text-align: center;
  letter-spacing: .02em;
}

.input-suffix span {
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  color: var(--muted);
}

.field-hint {
  font-size: 12px;
  color: var(--muted);
}

.form-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 12px 0 22px;
}

.primary-button, .secondary-button {
  min-height: 44px;
  padding: 11px 20px;
  border-radius: 10px;
  font-weight: 650;
  font-size: 14px;
}

.primary-button {
  background: var(--accent);
  border: 1px solid var(--accent);
  color: var(--bg);
}

.secondary-button {
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--text);
}

.primary-button:disabled {
  opacity: .55;
  cursor: not-allowed;
}

.secondary-button:hover:not(:disabled) {
  border-color: var(--accent);
}

.submission-checkpoint {
  display: grid;
  gap: 16px;
  padding: 22px 0 0;
  border-top: 1px solid var(--line);
  background: transparent;
}

.submission-checkpoint-heading strong {
  font-size: 16px;
  color: var(--text);
}

.submission-checkpoint-heading p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  margin: 4px 0 0;
}

.submission-turnstile {
  min-height: 65px;
  max-width: 100%;
  overflow: visible;
}

.submission-checkpoint-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 18px;
}

.submission-checkpoint-actions p {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  margin: 0;
  flex: 1 1 230px;
  overflow-wrap: anywhere;
}

.submission-checkpoint-actions p[data-state=error] {
  color: #b62f37;
}

.submission-checkpoint-actions p[data-state=success] {
  color: #187d4b;
}

.submission-checkpoint-actions a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.preview {
  margin-top: 30px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 12px;
}

.preview #preview-text.article-page {
  padding: 0;
  margin: 0;
}

.preview #preview-text.article-page h1 {
  margin-top: 14px;
}

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

.skip-link {
  position: absolute;
  left: 10px;
  top: -60px;
  padding: 10px;
  background: var(--surface);
  z-index: 20;
}

.skip-link:focus {
  top: 10px;
}

/* Editorial article pages */
.article-page {
  position: relative;
  margin: 0 auto;
  padding: 65px 0 90px;
  padding-top: 38px;
}

.article-page h1 {
  font-family: Georgia,"Songti SC",serif;
  font-size: clamp(32px,4.2vw,52px);
  line-height: 1.3;
  letter-spacing: -.03em;
  margin: 14px 0;
}

.article-page .article-byline {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 45px;
}

.article-body {
  font-size: 16px;
  line-height: 1.95;
  overflow-wrap: anywhere;
}

.article-body h2, .article-body h3 {
  line-height: 1.45;
  scroll-margin-top: 90px;
}

.article-body h2 {
  font-size: 25px;
  margin-top: 50px;
}

.article-body h3 {
  font-size: 20px;
  margin-top: 35px;
}

.article-body p, .article-body ul, .article-body ol {
  margin: 17px 0;
}

.article-body a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-body blockquote {
  margin: 25px 0;
  padding: 3px 20px;
  border-left: 3px solid var(--accent);
  background: var(--soft);
  color: var(--muted);
}

.article-body img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
}

.article-body pre {
  overflow: auto;
  padding: 20px;
  border-radius: 10px;
  background: var(--soft);
}

.article-body code {
  font-size: .9em;
}

.article-body table {
  border-collapse: collapse;
  display: block;
  overflow: auto;
}

.article-body th, .article-body td {
  padding: 10px 14px;
  border: 1px solid var(--line);
}

.article-toc {
  margin: 20px 0 40px;
  border-bottom: 1px solid var(--line);
}

.article-toc summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  cursor: pointer;
  padding: 14px 0;
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.article-toc summary:focus-visible {
  outline: none;
  color: var(--accent);
}

.article-toc summary::-webkit-details-marker {
  display: none;
}

.article-toc summary::after {
  content: "";
  width: 8px;
  height: 8px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg);
  transition: transform .2s;
}

.article-toc.is-open summary::after, .article-toc[open]:not(.is-enhanced) summary::after {
  transform: rotate(225deg);
}

.article-toc-panel {
  display: grid;
  grid-template-rows: 1fr;
}

.article-toc.is-enhanced .article-toc-panel {
  grid-template-rows: 0fr;
  transition: grid-template-rows .24s ease;
}

.article-toc.is-open .article-toc-panel {
  grid-template-rows: 1fr;
}

.article-toc-clip {
  min-height: 0;
  overflow: hidden;
}

.article-toc ul {
  list-style: none;
  margin: 0;
  padding: 8px 6px 12px;
  max-height: 50vh;
  overflow-y: auto;
}

.article-toc li {
  margin: 0;
  font-size: 15px;
}

.article-toc li a {
  display: block;
  padding: 12px 6px;
  border-bottom: 1px solid var(--line);
  line-height: 1.5;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.article-toc li a:focus-visible {
  outline: none;
  color: var(--accent);
}

.article-toc a:hover, .article-toc a.is-active {
  color: var(--accent);
}

.article-toc li:last-child a {
  border-bottom: 0;
}

.article-contact {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 12px;
  margin-top: 50px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.article-back {
  font-size: 14px;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.demo-badge {
  display: inline-block;
  color: var(--accent);
  background: var(--soft);
  font-size: 11px;
  font-weight: 700;
  border-radius: 6px;
  padding: 2px 8px;
  margin: 5px 0;
}

.article-more {
  display: inline-flex;
  gap: 6px;
  align-items: center;
  color: var(--accent);
  font-weight: 650;
  font-size: 13px;
  margin-top: 12px;
}

.article-toc .toc-depth-3 {
  margin-left: 16px;
}

.article-toc a {
  color: var(--muted);
  text-decoration: none;
}

/* Archive-first layout: category navigation lives in the sidebar, not repeated cards. */
.archive-intro {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: clamp(38px,6vw,76px) 0 26px;
  padding-top: 42px;
  padding-bottom: 14px;
}

.archive-intro h1 {
  font-family: Georgia,"Songti SC",serif;
  font-size: clamp(32px,4vw,49px);
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: -.035em;
  margin: 8px 0;
}

.home-intro h1:focus, .archive-intro h1:focus {
  outline: none;
}

.archive-intro .lead {
  font-size: 15px;
  margin: 0;
}

.archive-intro+.section {
  padding-top: 18px;
}

.archive-intro+.section .section-heading {
  margin-bottom: 22px;
}

.submit-intro .lead {
  font-size: 14px;
  margin: 0;
}


/* Community contact page: shared layout, tokens and responsive typography. */
.community-content { max-width: 820px; margin: 0 auto 76px; }
.community-section { padding: 28px 0; border-top: 1px solid var(--line); }
.community-section h2 { margin: 0 0 10px; font-size: 20px; font-weight: 600; letter-spacing: -.02em; }
.community-section > p { color: var(--muted); font-size: 14px; margin: 0 0 18px; }
.community-people { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 24px; margin-bottom: 18px; }
.community-person { display: flex; align-items: center; justify-content: space-between; gap: 18px; min-width: 0; padding: 22px 0; border-bottom: 1px solid var(--line); }
.community-person-info { min-width: 0; }
.community-person-name { display: flex; align-items: center; flex-wrap: wrap; gap: 9px; margin: 0; font-size: 16px; font-weight: 650; }
.community-role { font-size: 12px; font-weight: 500; color: var(--muted); }
.community-person-info p { color: var(--muted); font-size: 13px; margin: 4px 0; }
.community-person-links { display: flex; gap: 12px; flex: none; }
.community-person-links a { display: inline-flex; align-items: center; justify-content: center; width: 28px; height: 28px; color: var(--muted); }
.community-person-links a:hover, .community-person-links a:focus-visible { color: var(--accent); }
.community-person-links svg { width: 18px; height: 18px; }
.community-links { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 5px; }
.community-links a, .community-contact a { color: var(--accent); font-size: 14px; }
.community-links a:hover, .community-contact a:hover { text-decoration: underline; text-underline-offset: 3px; }
.community-contact { display: flex; gap: 14px 24px; align-items: center; flex-wrap: wrap; }
@media(max-width:580px) {
  .community-content { margin-bottom: 42px; }
  .community-people { grid-template-columns: 1fr; }
  .community-person { gap: 12px; }
}

/* One shared right-arrow interaction, following the personal-site implementation. */
.link-arrow {
  display: inline-block;
  vertical-align: middle;
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  margin-left: 6px;
  border-top: 1.5px solid currentColor;
  border-right: 1.5px solid currentColor;
  transform: rotate(45deg);
  transition: transform .16s ease;
}

a:is(:hover, :focus-visible) .link-arrow {
  transform: translateX(3px) rotate(45deg);
}

.link-arrow-left {
  transform: rotate(225deg);
}

a:is(:hover, :focus-visible) .link-arrow-left {
  transform: translateX(-3px) rotate(225deg);
}

.nav a:is(.nav-contribute, .nav-community) {
  position: relative;
  margin-top: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-contribute::before, .nav-community::before {
  content: "";
  position: absolute;
  top: -11px;
  left: 0;
  right: 0;
  border-top: 1px solid var(--line);
}

.sidebar-theme {
  display: flex;
  align-items: center;
  gap: 12px;
  width: max-content;
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
  padding: 12px 13px;
  text-align: left;
  font-size: 14px;
  border-radius: 10px;
  transition: background .18s,color .18s;
}

.sidebar-theme:hover {
  background: var(--soft);
  color: var(--text);
}

.sidebar-theme svg {
  display: block;
  width: 19px;
  height: 19px;
  flex: none;
}

.sidebar-theme [data-theme-icon] {
  display: none;
}

.sidebar-theme[data-mode=system] [data-theme-icon=system], .sidebar-theme[data-mode=light] [data-theme-icon=light], .sidebar-theme[data-mode=dark] [data-theme-icon=dark] {
  display: block;
}

.home-intro {
  padding: clamp(50px,8vw,105px) 0 65px;
  max-width: 760px;
}

.home-intro h1 {
  font-family: Georgia,"Songti SC",serif;
  font-size: clamp(38px,5.3vw,68px);
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: -.035em;
  margin: 18px 0 24px;
}

.home-intro h1 em {
  color: var(--accent);
  font-style: normal;
}

.home-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 30px;
}

[hidden] {
  display: none!important;
}

html[data-view="home"] #archive-intro,
html[data-view="home"] #archive-section,
html[data-view="archive"] #home-intro {
  display: none;
}

/* Accessible mobile navigation and compact page structure. */
.nav a:focus-visible, .sidebar-theme:focus-visible {
  outline-offset: 0;
}

.nav a[aria-current="page"] {
  background: var(--soft);
  color: var(--accent);
  font-weight: 650;
}

.article-back .link-arrow {
  margin-left: 0;
}

.field #body {
  min-height: 250px;
}

.field textarea[hidden] {
  display: none!important;
}

.markdown-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding: 12px;
  border: 1px solid var(--line);
  border-bottom: 0;
  border-radius: 10px 10px 0 0;
  background: var(--surface);
  margin-bottom: -8px;
}

.markdown-action {
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--surface);
  color: var(--text);
  font-size: 13px;
  line-height: 1.4;
  padding: 7px 10px;
  white-space: nowrap;
}

.markdown-action:hover, .markdown-action:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
}

/* Lightweight Markdown editing and in-place formatted preview. */
.markdown-toolbar+textarea {
  border-radius: 0 0 10px 10px;
  min-height: 250px;
}

.markdown-preview {
  border: 1px solid var(--line);
  border-radius: 0 0 10px 10px;
  background: var(--surface);
  padding: 16px;
  min-height: 180px;
}

.markdown-preview:empty:before {
  content: '暂无正文，返回编辑后开始填写';
  color: var(--muted);
  font-size: 14px;
}

.markdown-preview-toggle {
  background: var(--soft);
  color: var(--accent);
  border-color: var(--accent);
  font-weight: 650;
}

.markdown-preview-toggle[aria-pressed="true"] {
  color: var(--accent);
  border-color: var(--accent);
}

/* Form demo controls and published article typography share the same article-body rules. */
.demo-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.article-body h1 {
  font-size: clamp(27px,3.5vw,38px);
  line-height: 1.4;
  margin-top: 42px;
}

.article-body del {
  text-decoration: line-through;
}

.article-body input[type="checkbox"] {
  margin-right: 8px;
}

.markdown-help {
  border-top: 1px solid var(--line);
  padding: 12px 0;
  margin: 12px 0 16px;
  color: var(--muted);
}

.markdown-help summary {
  font-size: 13px;
  color: var(--accent);
  font-weight: 600;
  cursor: pointer;
}

.markdown-help-content {
  display: grid;
  gap: 9px;
  padding: 13px 0 4px;
  font-size: 13px;
  line-height: 1.6;
}

.markdown-help-content>div {
  display: grid;
  grid-template-columns: minmax(110px,170px) minmax(0,1fr);
  gap: 12px;
}

.markdown-help-content code {
  font-size: 12px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  color: var(--text);
  background: var(--soft);
  padding: 5px 7px;
  border-radius: 5px;
}

.markdown-help-content p {
  margin: 7px 0 0;
}

.field #contact {
  min-height: 105px;
}

.year-select:focus-within .year-trigger {
  border-color: var(--accent);
}

/* Shared brand artwork and photographic page atmosphere. */
/* Use the original official horizontal logo as one image. Keep its native
proportions; no composition, mask, crop or duplicate seal. */
.brand-logo {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1226/285;
  max-width: 215px;
}

.mobile-brand-logo {
  display: block;
  width: 150px;
  max-width: 100%;
  height: auto;
  object-fit: contain;
}

.campus-banner {
  flex: none;
  height: clamp(270px,30vw,440px);
  background-color: var(--soft);
  background-image: linear-gradient(to bottom,transparent 70%,var(--bg) 100%),
    var(--banner-tint),url("../images/anguo-garden.jpg");
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center,center,center 43%;
  overflow: hidden;
}

.page .content {
  flex: 1;
  width: 100%;
  background: var(--bg);
}

.page .icon-button {
  color: var(--text);
}

.page.is-home .home-intro {
  display: flex;
  flex-direction: column;
  justify-content: center;
  max-width: none;
  min-height: 0;
  padding: clamp(44px,6vw,86px) 0;
}

.page.is-home .hero-copy {
  max-width: 650px;
}

.page.is-home .home-intro h1 {
  position: relative;
  top: -140px;
  font-family: "Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",serif;
  font-style: italic;
  transform: skewX(-7deg);
  transform-origin: left center;
  font-weight: 720;
  letter-spacing: -.04em;
  line-height: 1.15;
  font-size: clamp(40px,4.7vw,70px);
  color: var(--text);
  margin: 24px 0;
  margin-bottom: -100px;
}

.page.is-home .home-intro h1 em {
  color: var(--accent);
  font-style: inherit;
}

.page.is-home .home-intro .lead {
  font-size: clamp(15px,1.35vw,18px);
  max-width: 560px;
}

.page.is-home .home-actions {
  gap: 12px;
  margin-top: 30px;
}

.page.is-home .home-actions .text-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin: 0;
  padding: 11px 20px;
  min-height: 46px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  font-size: 14px;
}

.page.is-home .home-actions .text-link:first-child {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}

.page.is-home .home-actions .text-link:hover {
  border-color: var(--accent);
}

/* HAI's two-column footer structure; colors and surface belong to UEM's theme. */
.site-footer {
  flex: none;
  background: linear-gradient(to bottom,var(--bg),var(--surface) 80px);
  color: var(--text);
  padding: 48px clamp(22px,5vw,76px) 22px;
}

.footer-inner {
  width: 100%;
  max-width: none;
  margin: 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0,1fr) max-content;
  justify-content: space-between;
  align-items: center;
  gap: clamp(24px,5vw,72px);
}

.footer-grid>div:last-child {
  justify-self: end;
  text-align: right;
}

.footer-brand-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  max-width: 100%;
  color: var(--text);
}

.footer-logo {
  display: block;
  width: 52px;
  height: 52px;
  flex: none;
  object-fit: contain;
}

.footer-brand-name {
  display: inline-block;
  font-family: "Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",serif;
  font-style: italic;
  transform: skewX(-7deg);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .035em;
}

.footer-brand p {
  max-width: 420px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.9;
  margin: 16px 0 0;
}

.footer-title {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--muted);
  font-weight: 700;
  margin: 0 0 13px;
}

.footer-links {
  display: grid;
  justify-items: end;
  gap: 9px;
}

.footer-links a {
  font-size: 14px;
  color: var(--text);
}

.footer-links a:hover, .footer-links a:focus-visible, .footer-bottom a:hover {
  color: var(--accent);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-top: 36px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
}

.footer-github {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.footer-github svg {
  width: 16px;
  height: 16px;
  flex: none;
}

/* Responsive layout and environment preferences */

@media(max-width:900px) {
  .search-open {
    width: 44px;
    height: 44px;
    margin-left: auto;
    margin-right: 8px;
    justify-content: center;
    padding: 0;
    border: 0;
  }

  .search-open .search-label, .search-open kbd {
    display: none;
  }

  .search-open svg {
    width: 28px;
    height: 28px;
  }

  .education-fields {
    grid-template-columns: 1fr;
  }
  :root {
  --mobile-header-height: 72px;
  }

  .shell {
  display: block;
  }

  .page {
  width: 100%;
  margin-left: 0;
  }

  .page .topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--mobile-header-height);
  padding: 0 clamp(18px,4vw,28px);
  background: var(--surface);
  border-bottom: 0;
  }

  .campus-banner {
  background-image: linear-gradient(to bottom,var(--surface),transparent 80px),
    linear-gradient(to bottom,transparent 70%,var(--bg) 100%),
    var(--banner-tint),url("../images/anguo-garden.jpg");
  background-position: center,center,center,center 43%;
  }

  .mobile-brand {
  display: flex;
  align-items: center;
  min-width: 0;
  min-height: 44px;
  }

  .menu-button {
  display: grid;
  place-items: center;
  touch-action: manipulation;
  flex: none;
  width: 44px;
  height: 44px;
  padding: 0;
  color: var(--text);
  }

  .menu-lines {
  display: grid;
  gap: 5px;
  width: 20px;
  }

  .menu-lines span {
  display: block;
  height: 2px;
  width: 100%;
  border-radius: 2px;
  background: currentColor;
  transition: transform .2s ease,opacity .2s ease;
  }

  .menu-button[aria-expanded=true] .menu-lines span:first-child {
  transform: translateY(7px) rotate(45deg);
  }

  .menu-button[aria-expanded=true] .menu-lines span:nth-child(2) {
  opacity: 0;
  }

  .menu-button[aria-expanded=true] .menu-lines span:last-child {
  transform: translateY(-7px) rotate(-45deg);
  }

  .sidebar {
  position: fixed;
  z-index: 45;
  top: calc(var(--mobile-header-height) + 10px);
  bottom: auto;
  left: clamp(14px,4vw,28px);
  right: clamp(14px,4vw,28px);
  width: auto;
  height: auto;
  max-height: calc(100dvh - var(--mobile-header-height) - 22px);
  padding: 14px;
  overflow-y: auto;
  overscroll-behavior: contain;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
  box-shadow: 0 20px 50px rgba(4,16,38,.18);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(-8px);
  transition: opacity .2s ease,transform .2s ease,visibility 0s linear .2s;
  }

  .shell.menu-open .sidebar {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
  transition: opacity .2s ease,transform .2s ease,visibility 0s;
  }

  /* Navigation reset is a lifecycle state, not an additional animation.
  Close the old menu in the same frame before the browser swaps documents. */
  .shell.nav-reset .sidebar, .shell.nav-reset .menu-lines span {
  transition: none;
  }

  .sidebar .brand {
  display: none;
  }

  .sidebar .nav {
  gap: 3px;
  }

  .sidebar .nav a {
  padding: 10px 13px;
  }

  .sidebar-bottom {
  justify-content: flex-start;
  margin-top: 12px;
  padding-top: 16px;
  }

  .content {
  max-width: 900px;
  }

  .home-intro {
  padding: 42px 0 40px;
  }

  .brand-logo {
  max-width: 100%;
  }

  .mobile-brand-logo {
  width: clamp(128px,38vw,174px);
  }

  .page.is-home .hero-copy {
  max-width: 720px;
  }

  .page.is-home .home-intro {
  padding: 52px 0 62px;
  }
}

@media(max-width:720px) {
  .footer-grid {
  grid-template-columns: minmax(0,1fr);
  gap: 28px;
  }

  .footer-grid>div:last-child {
  justify-self: start;
  text-align: left;
  }

  .footer-links {
  justify-items: start;
  }
}

@media(max-width:580px) {
  .form-wrap {
  padding: 0;
  margin-bottom: 42px;
  }

  .submission-checkpoint {
  padding: 14px 0;
  }

  .submission-checkpoint-actions {
  align-items: stretch;
  }

  .submission-checkpoint-actions .primary-button {
  width: 100%;
  }

  .section {
  padding: 52px 0;
  }

  .section-heading {
  align-items: flex-end;
  }

  .section-actions>p {
  text-align: right;
  }

  .submit-intro {
  padding-top: 55px;
  }

  .archive-intro {
  padding: 36px 0 18px;
  }

  .archive-intro+.section {
  padding-top: 20px;
  }

  .submit-intro, .archive-intro {
  padding-top: 26px;
  }

  .article-page {
  padding-top: 25px;
  }

  .home-intro h1 {
  font-size: clamp(34px,9vw,46px);
  }

  .home-actions {
  gap: 4px 24px;
  }

  .markdown-toolbar {
  padding: 9px;
  gap: 5px;
  }

  .markdown-action {
  padding: 7px 9px;
  font-size: 12px;
  }

  .markdown-help-content>div {
  grid-template-columns: 1fr;
  gap: 4px;
  }

  .mobile-brand-logo {
  width: clamp(128px,38vw,154px);
  }

  .campus-banner {
  height: clamp(220px,60vw,320px);
  background-position: center,center,center,52% 43%;
  }

  .page.is-home .content {
  padding: 0 22px;
  }

  .page.is-home .home-intro {
  padding: 40px 0 64px;
  }

  .page.is-home .home-intro h1 {
  top: -105px;
  margin-bottom: -75px;
  font-size: clamp(34px,9vw,48px);
  }

  .page.is-home .home-actions .text-link {
  padding: 10px 14px;
  }

  .site-footer {
  padding: 38px 22px 24px;
  }

  .footer-bottom {
  flex-direction: column;
  gap: 12px;
  margin-top: 28px;
  }
}

@media(prefers-color-scheme:dark) {
  :root:not([data-theme]) {
  color-scheme: dark;
  --bg: #0b1424;
  --surface: #111e32;
  --text: #edf4ff;
  --muted: #a6b8cf;
  --line: #283b55;
  --accent: #7bb6ff;
  --soft: #172d4c;
  --banner-tint: linear-gradient(110deg,rgba(4,17,38,.24),rgba(4,17,38,.16));
  }
}

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

  *, *:before, *:after {
  transition: none!important;
  animation: none!important;
  }

  .sidebar {
  transition: none;
  }

  .link-arrow {
  transition: none;
  }

  a:is(:hover, :focus-visible) .link-arrow {
  transform: rotate(45deg);
  }

  a:is(:hover, :focus-visible) .link-arrow-left {
  transform: rotate(225deg);
  }
}