/* Theme tokens: light by default, dark via the system setting or the toggle button. */
:root {
  --bg: #ffffff;
  --surface: #ffffff;
  --text: #1f2937;
  --text-muted: #4b5563;
  --text-faint: #6b7280;
  --heading: #111827;
  --border: #e6e8ee;
  --accent: #1d4f91;
  --accent-strong: #163d72;
  --on-accent: #ffffff;
  --chip-bg: #eef3fa;
  --chip-text: #1d4f91;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.04), 0 6px 20px rgba(15, 23, 42, 0.06);
  --font-serif: Charter, "Bitstream Charter", "Sitka Text", Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  --fs-xl: 38px;
  --fs-lg: 23px;
  --fs-md: 16px;
  --fs-sm: 13.5px;
  --fs-xs: 12.5px;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --bg: #0d1117;
  --surface: #151b24;
  --text: #e4e8ee;
  --text-muted: #b3bcc9;
  --text-faint: #8a94a4;
  --heading: #f2f5f9;
  --border: #252d3a;
  --accent: #82a8ff;
  --accent-strong: #a9c3ff;
  --on-accent: #0d1117;
  --chip-bg: rgba(130, 168, 255, 0.13);
  --chip-text: #a9c3ff;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 6px 20px rgba(0, 0, 0, 0.25);
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0d1117;
    --surface: #151b24;
    --text: #e4e8ee;
    --text-muted: #b3bcc9;
    --text-faint: #8a94a4;
    --heading: #f2f5f9;
    --border: #252d3a;
    --accent: #82a8ff;
    --accent-strong: #a9c3ff;
    --on-accent: #0d1117;
    --chip-bg: rgba(130, 168, 255, 0.13);
    --chip-text: #a9c3ff;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 6px 20px rgba(0, 0, 0, 0.25);
    color-scheme: dark;
  }
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-serif);
  font-size: var(--fs-md);
  line-height: 1.65;
  text-wrap: pretty;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  color: var(--accent-strong);
  text-decoration: underline;
  text-underline-offset: 2px;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 6px;
}

.icon {
  width: 15px;
  height: 15px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.container {
  max-width: 820px;
  margin: 0 auto;
  padding: 72px 24px 24px;
}

.intro h1 {
  margin: 0 0 18px;
  font-size: var(--fs-xl);
  line-height: 1.2;
  font-weight: 600;
  font-variant: small-caps;
  color: var(--heading);
  letter-spacing: 0.05em;
}

.intro p {
  margin: 0 0 12px;
  color: var(--text-muted);
}

.intro strong {
  color: var(--text);
  font-weight: 600;
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 7px;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: var(--fs-sm);
  font-weight: 500;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.links a:hover {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--on-accent);
  text-decoration: none;
}

section {
  margin-top: 56px;
}

h2 {
  margin: 0 0 18px;
  padding-left: 12px;
  border-left: 3px solid var(--accent);
  font-size: var(--fs-lg);
  line-height: 1.15;
  font-weight: 600;
  color: var(--heading);
}

h3 {
  margin: 30px 0 14px;
  font-family: var(--font-sans);
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.section-note {
  margin: -6px 0 0;
  color: var(--text-muted);
  font-size: var(--fs-md);
}

.section-note + h3 {
  margin-top: 22px;
}

/* Dotted lists: recent updates ("Mon YYYY: sentence") and service. */
.dots {
  list-style: none;
  margin: 0;
  padding: 0;
}

.dots li {
  position: relative;
  padding: 5px 0 5px 18px;
  font-size: var(--fs-md);
  color: var(--text-muted);
}

.dots li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 15px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.7;
}

.dots .date,
.dots strong {
  font-weight: 600;
  color: var(--heading);
  font-variant-numeric: tabular-nums;
}

/* Paper entries: title, authors, venue and links. */
.papers {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.paper {
  padding: 2px 0 2px 18px;
  border-left: 2px solid var(--border);
  transition: border-color 0.2s ease;
}

.paper:hover {
  border-left-color: var(--accent);
}

.paper h4 {
  margin: 0 0 6px;
  font-size: var(--fs-md);
  line-height: 1.4;
  font-weight: 600;
  color: var(--heading);
}

.authors {
  margin: 0 0 10px;
  font-size: var(--fs-sm);
  line-height: 1.55;
  color: var(--text-muted);
}

.authors .me {
  font-weight: 700;
  color: var(--text);
}

.meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.meta a,
.venue {
  padding: 2px 10px;
  font-family: var(--font-sans);
  border-radius: 6px;
  font-size: var(--fs-xs);
  font-weight: 500;
}

.meta a {
  background: var(--chip-bg);
  color: var(--chip-text);
}

.meta a:hover {
  background: var(--accent);
  color: var(--on-accent);
  text-decoration: none;
}

.venue {
  margin-right: 4px;
  background: var(--accent);
  color: var(--on-accent);
  font-weight: 650;
}

/* Education. */
.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.timeline li {
  display: grid;
  grid-template-columns: 112px 1fr;
  gap: 16px;
  padding: 6px 0;
  font-size: var(--fs-md);
}

.timeline .date {
  font-weight: 600;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.timeline strong {
  color: var(--heading);
  font-weight: 600;
}

.timeline .detail {
  color: var(--text-muted);
}

footer {
  max-width: 820px;
  margin: 64px auto 0;
  padding: 22px 24px 40px;
  border-top: 1px solid var(--border);
  color: var(--text-faint);
  font-size: var(--fs-sm);
  text-align: center;
}

.theme-toggle {
  position: absolute;
  top: 18px;
  right: 18px;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--surface);
  color: var(--text-muted);
  cursor: pointer;
  box-shadow: var(--shadow);
}

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

.theme-toggle .icon {
  width: 18px;
  height: 18px;
}

.icon-sun {
  display: none;
}

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

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

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-sun {
    display: block;
  }

  :root:not([data-theme="light"]) .icon-moon {
    display: none;
  }
}

@media (max-width: 720px) {
  .container {
    padding: 64px 16px 16px;
  }

  :root {
    --fs-xl: 32px;
  }

  section {
    margin-top: 44px;
  }

  .paper {
    padding-left: 14px;
  }
}

@media (max-width: 480px) {
  .timeline li {
    grid-template-columns: 1fr;
    gap: 0;
    padding: 7px 0;
  }

  .timeline .date {
    font-size: var(--fs-sm);
  }
}