:root {
  --color-text: #111111;
  --color-text-secondary: #828282;
  --color-background: #fdfdfd;
  --color-background-dropdown: #efefef;
  --color-border: #e8e8e8;
  --color-link: #2a7ae2;
  --color-link-visited: #1756a9;
  --color-header: #424242;
  --color-button-bg: #f3f3f3;
  --color-button-text: #111;
  --color-button-border: #111;
  --color-button-hover-bg: #111;
  --color-button-hover-text: #ffffff;
  --accent-blue: #2a7ae2;
  --accent-orange: #e67e22;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-text: #bbbbbb;
    --color-text-secondary: #999999;
    --color-background: #181818;
    --color-background-dropdown: #2b2b2b;
    --color-border: #404040;
    --color-link: #79b8ff;
    --color-link-visited: #79b8ff;
    --color-header: #d0d0d0;
    --color-button-bg: #212121;
    --color-button-text: #d0d0d0;
    --color-button-border: #d0d0d0;
    --color-button-hover-bg: #d0d0d0;
    --color-button-hover-text: #212121;
    --accent-blue: #5fa1ff;
    --accent-orange: #f5a85a;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --color-text: #bbbbbb;
  --color-text-secondary: #999999;
  --color-background: #181818;
  --color-background-dropdown: #2b2b2b;
  --color-border: #404040;
  --color-link: #79b8ff;
  --color-link-visited: #79b8ff;
  --color-header: #d0d0d0;
  --color-button-bg: #212121;
  --color-button-text: #d0d0d0;
  --color-button-border: #d0d0d0;
  --color-button-hover-bg: #d0d0d0;
  --color-button-hover-text: #212121;
  --accent-blue: #5fa1ff;
  --accent-orange: #f5a85a;
  color-scheme: dark;
}

* { box-sizing: border-box; }

body, h1, h2, h3, h4, h5, h6, p, blockquote, pre, hr, dl, dd, ol, ul, figure { margin: 0; padding: 0; }

body {
  font: 400 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", "Segoe UI Symbol", "Segoe UI Emoji", "Apple Color Emoji", Roboto, Helvetica, Arial, sans-serif;
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "kern" 1;
  font-kerning: normal;
  display: flex;
  min-height: 100vh;
  flex-direction: column;
  overflow-wrap: break-word;
}

h1, h2, h3, h4, h5, h6, p, blockquote, pre, ul, ol, dl, figure { margin-bottom: 15px; }
h1, h2, h3, h4, h5, h6 { font-weight: 400; color: var(--color-header); }
h1 { font-size: 2rem; letter-spacing: -0.5px; }
h2 { font-size: 1.4rem; margin-top: 30px; }

hr { border: 0; border-top: 1px solid var(--color-border); margin: 30px 0; }

a { color: var(--color-link); text-decoration: none; }
a:hover { text-decoration: underline; }
a:visited { color: var(--color-link-visited); }

img { max-width: 100%; vertical-align: middle; }

ul, ol { margin-left: 24px; }
li > ul, li > ol { margin-bottom: 0; }
li { margin-bottom: 4px; }

pre {
  background-color: var(--color-background-dropdown);
  border-radius: 6px;
  padding: 10px 14px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.45;
}

code {
  background-color: var(--color-background-dropdown);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 0.9em;
  font-family: "SF Mono", Monaco, Menlo, Consolas, monospace;
}
pre code { background: none; padding: 0; font-size: inherit; }

main { display: block; flex: 1; }

.wrapper {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 16px;
}

.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: 14px 0;
  margin-bottom: 24px;
}

.site-header .wrapper { display: flex; align-items: baseline; justify-content: space-between; flex-wrap: wrap; gap: 8px; }

.site-title {
  font-size: 1.625rem;
  font-weight: 300;
  letter-spacing: -1px;
}
.site-title, .site-title:visited { color: var(--color-header); }
.site-title:hover { text-decoration: none; }
.site-title .accent-blue { color: var(--accent-blue); }
.site-title .accent-orange { color: var(--accent-orange); }

.site-nav { font-size: 0.95rem; }
.site-nav a { color: var(--color-text); margin-left: 16px; }
.site-nav a:first-child { margin-left: 0; }

.header-right { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
dark-mode-toggle { font-size: 0.85rem; }

.page-content { padding-bottom: 40px; }

.profile-photo {
  float: left;
  width: 130px;
  border-radius: 4px;
  margin: 0 18px 12px 0;
}


.year-section { margin-bottom: 18px; }

.year-toggle {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--color-header);
  padding: 0;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.year-toggle .arrow {
  display: inline-block;
  transition: transform 0.2s ease;
  font-size: 0.85em;
}
.year-toggle.collapsed .arrow { transform: rotate(-90deg); }

.year-content { margin: 8px 0 0 18px; }
.year-content ul { margin-left: 18px; padding-left: 0; list-style: disc; }
.year-content li { margin-bottom: 14px; }

.section-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  font-family: inherit;
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--color-header);
  margin: 30px 0 15px 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-align: left;
}
.section-toggle .arrow {
  display: inline-block;
  transition: transform 0.2s ease;
  font-size: 0.7em;
}
.section-toggle.collapsed .arrow { transform: rotate(-90deg); }
.collapsible-content { margin-top: 0; }

.paper-title { font-weight: 600; }
.paper-meta { color: var(--color-text-secondary); }

.paper-actions { margin-top: 4px; display: flex; flex-wrap: wrap; gap: 6px; }

.btn {
  appearance: none;
  background-color: var(--color-button-bg);
  border: 1px solid var(--color-button-border);
  border-radius: 5px;
  color: var(--color-button-text);
  cursor: pointer;
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  padding: 3px 10px;
  line-height: 1.4;
  transition: background-color 0.15s, color 0.15s;
  text-decoration: none;
}
.btn:hover, .btn.active {
  background-color: var(--color-button-hover-bg);
  color: var(--color-button-hover-text);
  text-decoration: none;
}
.btn:visited { color: var(--color-button-text); }
.btn:visited:hover { color: var(--color-button-hover-text); }

.dropdown-panel {
  display: none;
  background-color: var(--color-background-dropdown);
  padding: 10px 14px;
  border-radius: 6px;
  margin-top: 6px;
  font-size: 0.95rem;
}
.dropdown-panel.open { display: block; }
.dropdown-panel pre { background: transparent; padding: 0; margin: 0; }

.post-header { margin-bottom: 28px; }
.post-title { font-size: 2rem; letter-spacing: -0.5px; margin-bottom: 6px; }
.post-date { color: var(--color-text-secondary); font-size: 0.9rem; margin-bottom: 0; }
.post-lede { color: var(--color-text-secondary); font-style: italic; margin-top: 6px; }

article p, article ul, article ol { line-height: 1.7; }

table {
  border-collapse: collapse;
  margin-bottom: 18px;
  width: 100%;
  font-size: 0.92rem;
}
th, td {
  border-bottom: 1px solid var(--color-border);
  padding: 7px 10px;
  text-align: left;
  vertical-align: top;
}
thead th { border-bottom: 2px solid var(--color-border); }
tbody tr:last-child td { border-bottom: 2px solid var(--color-border); }

.post-list { list-style: none; margin-left: 0; padding-left: 0; }
.post-list li { margin-bottom: 18px; padding-bottom: 14px; border-bottom: 1px solid var(--color-border); }
.post-list li:last-child { border-bottom: none; }
.post-list .post-list-title { font-size: 1.15rem; }
.post-list .post-list-date { color: var(--color-text-secondary); font-size: 0.88rem; margin-left: 8px; }
.post-list .post-list-excerpt { color: var(--color-text-secondary); margin-top: 4px; }

.site-footer {
  border-top: 1px solid var(--color-border);
  margin-top: 40px;
  padding: 22px 0;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  text-align: center;
}
.site-footer p { margin-bottom: 6px; }
.site-footer p:last-child { margin-bottom: 0; }
.footer-links a { margin: 0 6px; }
.footer-meta { color: var(--color-text-muted, #999); font-size: 0.85rem; }

@media (max-width: 600px) {
  .profile-photo { width: 100px; margin: 0 12px 8px 0; }
  h1 { font-size: 1.7rem; }
  h2, .section-toggle { font-size: 1.2rem; }
  .site-nav a { margin-left: 10px; }
}