* {
  box-sizing: border-box;
}

/* ── Theme variables ── */
:root {
  color-scheme: light;
  --background-color: #fff;
  --text-color: #1a1a1a;
  --dimmed-text-color: #777;
  --link-color: #0066cc;
  --border-color: #ddd;
  --code-bg: #f5f5f5;
  --btn-bg: #1a1a1a;
  --btn-text: #fff;
  --btn-bg-hover: #333;
}

[data-theme="dark"] {
  color-scheme: dark;
  --background-color: #0e0e11;
  --text-color: #ddd;
  --dimmed-text-color: #aaa;
  --link-color: #65a0ff;
  --border-color: #454545;
  --code-bg: #1a1a1e;
  --btn-bg: #ddd;
  --btn-text: #111;
  --btn-bg-hover: #fff;
}

html {
  -webkit-font-smoothing: antialiased;
  scrollbar-gutter: stable;
}

body {
  font: normal 1.21em KaTeX_Main, Times New Roman, serif;
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.6;
  
  max-width: 640px;
  width: 100%;
  margin: 0 auto;
  padding: 27px;
}

header {
  position: relative;
  margin-bottom: 0px;
}

.header-actions {
  position: absolute;
  top: 0;
  right: 0;
  display: flex;
  gap: 2px;
}

.theme-toggle,
.lang-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-color);
  border-radius: 6px;
}

.theme-toggle:hover,
.lang-toggle:hover {
  opacity: 0.65;
}

.theme-icon {
  width: 22px;
  height: 22px;
  display: block;
}

.translate-icon {
  width: 20px;
  height: 20px;
  display: block;
}

.theme-icon-moon {
  display: none;
}

[data-theme="dark"] .theme-icon-sun {
  display: none;
}

[data-theme="dark"] .theme-icon-moon {
  display: block;
}

h1, h2 {
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
  line-height: 2rem;
  font-size: 1.5rem;
}

header h1 {
  font-size: 1.8rem;
  font-weight: 800;
  margin: 0 0 0px 0;
}

.subtitle {
  color: var(--text-color);
  font-size: 1.05rem;
  margin: 0;
}

.home-photo {
  width: 600px;
  height: 150px;
  margin-top: 18px;
  margin-bottom:0px;
  display: block;
}

h2 {
  font-size: 20.25px;
  font-weight: 800;
  padding-bottom: 0px;
  margin-top: 25px;
  margin-bottom: 20px;
}

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

.post-item {
  margin-bottom: 18px;
}

.post-date {
  font-size: 15px;
  line-height: 1.25rem;
  color: var(--dimmed-text-color);
  width: 83px;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
  font-style: italic;
  font-family: ui-serif, Georgia, Cambria, "Times New Roman", Times, serif;
}

.post-date-blog {
  font-size: 13.5px;
  line-height: 1.25rem;
  color: var(--dimmed-text-color);
  width: 83px;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
  font-style: italic;
  font-family: ui-serif, Georgia, Cambria, "Times New Roman", Times, serif;
  margin-bottom:20px;
}

.post-title-link {
  display: flex;
  align-items: baseline;
  gap: 18px;
  color: var(--link-color);
  text-decoration: none;
  font-size: 18px;
  font-weight: normal;
  line-height: 1.5;
  font-family: ui-serif, Georgia, Cambria, "Times New Roman", Times, serif;
}

.bio p {
  margin-bottom: 16px;
  color: var(--text-color);
}

.bio-title-text {
  position: relative;
  display: inline-block;
  padding-right: 15px;
}

.bio-title-link {
  position: absolute;
  top: 2px;
  right: -2px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text-color);
  text-decoration: none;
  opacity: 0.55;
  border-radius: 4px;
  transition: opacity 0.15s ease;
}

.bio-title-link:hover {
  opacity: 1;
}

.bio-title-link svg {
  width: 14px;
  height: 14px;
  display: block;
  transform: rotate(11deg);
}

.post {
  margin-top: 0;
}

.post-title {
  font-size: 33.75px;
  font-weight: 800;
  margin: 0 0 13px 0;
  margin-top: 18px;
}

.post-content {
  margin-top: 24px;
}

.post-content h1,
.post-content h2,
.post-content h3 {
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  margin-top: 32px;
  margin-bottom: 12px;
}

.post-content h2 {
  font-size: 1.2rem;
}

.post-content p {
  margin-bottom: 16px;
}

.post-content img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 24px 0;
}

.post-content [align="center"] img {
  margin-left: auto;
  margin-right: auto;
}

.post-figure {
  margin: 24px 0;
}

.post-figure img {
  margin: 0;
}

.post-figcaption {
  margin-top: 8px;
  font-size: 0.85rem;
  color: var(--dimmed-text-color);
  text-align: center;
}

.post-content a {
  color: var(--link-color);
  text-decoration: none;
}

.post-content a:hover {
  text-decoration: underline;
}

.post-content pre {
  background: var(--code-bg);
  padding: 16px;
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.5;
  margin: 16px 0;
}

.post-content code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.875em;
}

.post-content pre code {
  font-size: 0.875rem;
}

.post-content blockquote {
  border-left: 3px solid var(--border-color);
  margin: 16px 0;
  padding-left: 16px;
  color: var(--dimmed-text-color);
}

.post-content ul,
.post-content ol {
  margin: 16px 0;
  padding-left: 24px;
}

.post-content li {
  margin-bottom: 8px;
}

.back-link {
  margin-top: 40px;
}

/* ── Admin ── */
.admin {
  margin-top: 0;
}

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

.admin-post-item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 8px;
}

.admin-post-date {
  font-size: 0.875rem;
  color: var(--dimmed-text-color);
  flex-shrink: 0;
}

.admin-post-title {
  color: var(--link-color);
  text-decoration: none;
  flex: 1;
}

.admin-post-title:hover {
  text-decoration: underline;
}

.admin-post-edit {
  color: var(--dimmed-text-color);
  text-decoration: none;
  font-size: 0.875rem;
  flex-shrink: 0;
}

.admin-post-edit:hover {
  color: var(--link-color);
}

.admin-empty {
  color: var(--dimmed-text-color);
  font-style: italic;
  margin-bottom: 12px;
}

.admin-error {
  color: #cc0000;
  margin-bottom: 12px;
  font-size: 0.9rem;
}

.admin-input {
  display: block;
  width: 100%;
  padding: 8px 12px;
  font-size: 0.95rem;
  background: var(--background-color);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  margin-bottom: 12px;
  font-family: inherit;
  box-sizing: border-box;
}

.admin-textarea {
  display: block;
  width: 100%;
  padding: 12px;
  font-size: 0.9rem;
  background: var(--background-color);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  line-height: 1.6;
  resize: vertical;
  box-sizing: border-box;
}

.admin-btn {
  padding: 8px 24px;
  font-size: 0.95rem;
  cursor: pointer;
  background: var(--btn-bg);
  color: var(--btn-text);
  border: none;
  font-family: inherit;
}

.admin-btn:hover {
  background: var(--btn-bg-hover);
}

.admin-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 12px;
}

.admin-link {
  color: var(--dimmed-text-color);
  text-decoration: none;
  font-size: 0.9rem;
}

.admin-link:hover {
  text-decoration: underline;
}

/* ── Admin Media ── */
.admin-media-section {
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

.admin-media-upload {
  margin-bottom: 20px;
}

.admin-media-upload-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.admin-file-input {
  font-size: 0.9rem;
  font-family: inherit;
  flex: 1;
}

.admin-btn-small {
  padding: 6px 16px;
  font-size: 0.85rem;
}

.admin-media-hint {
  margin-top: 6px;
  font-size: 0.8rem;
  color: var(--dimmed-text-color);
}

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

.admin-media-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border-color);
}

.admin-media-item:last-child {
  border-bottom: none;
}

.admin-media-preview {
  width: 80px;
  height: 60px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--code-bg);
  border-radius: 2px;
}

.admin-media-preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.admin-media-badge {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--dimmed-text-color);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.admin-media-info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.admin-media-name {
  font-size: 0.85rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.admin-media-size {
  font-size: 0.75rem;
  color: var(--dimmed-text-color);
}

.admin-media-delete-btn {
  padding: 4px 10px;
  font-size: 0.8rem;
  cursor: pointer;
  background: var(--background-color);
  color: #cc0000;
  border: 1px solid #cc0000;
  font-family: inherit;
  border-radius: 2px;
  flex-shrink: 0;
}

.admin-media-delete-btn:hover {
  background: #cc0000;
  color: #fff;
}

.admin-media-empty {
  color: var(--dimmed-text-color);
  font-style: italic;
  font-size: 0.9rem;
}

.admin-media-error {
  color: #cc0000;
  margin-bottom: 12px;
  font-size: 0.9rem;
}

.get-in-touch {
  margin: 0;
  color: var(--dimmed-text-color);
}

.get-in-touch-link {
  color: var(--link-color);
  text-decoration: none;
  font-size: 18px;
  font-weight: normal;
  line-height: 0.5rem;
  margin: 0;
  font-family: ui-serif, Georgia, Cambria, "Times New Roman", Times, serif;
}

/* ── Chat with me section ── */
.chat-desc a {
  color: var(--link-color);
  text-decoration: none;
}

.chat-desc a:hover {
  text-decoration: underline;
}

/* ── Agent page ── */
.agent-cta {
  display: inline-block;
  padding: 10px 24px;
  background: var(--btn-bg);
  color: var(--btn-text);
  border: none;
  font-family: inherit;
  font-size: 1rem;
  line-height: 1.4;
  text-decoration: none;
}

.agent-cta:hover {
  background: var(--btn-bg-hover);
}

.site-footer {
  margin-top: 10px;
  padding-top: 6px;
  font-size: 0.8rem;
  color: var(--dimmed-text-color);
  text-align: right;
}

.site-footer a {
  color: var(--link-color);
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
}

.site-footer p {
  margin: -4px;
}

/* ── Language toggle ── */
[data-lang="en"] .lang-zh {
  display: none;
}

[data-lang="zh"] .lang-en {
  display: none;
}