/* --- Base --- */
:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --text: #1a1a1a;
  --muted: #5c5c5c;
  --accent: #0b57d0;
  --accent-hover: #0842a0;
  --border: #e0e0e0;
  --tab-active-bg: #e8f0fe;
  --font: "Source Serif 4", "Georgia", "Times New Roman", serif;
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --max: 42rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: #fff;
  z-index: 100;
}

.skip-link:focus {
  left: 0;
}

/* --- Header --- */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 1.75rem 1rem;
}

.site-header .inner {
  max-width: var(--max);
  margin: 0 auto;
}

.site-title {
  margin: 0;
  font-family: var(--font);
  font-size: 1.75rem;
  font-weight: 600;
}

.site-tagline {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

/* --- Tabs --- */
.tabs {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.5rem 1rem;
}

.tab-list button {
  font: inherit;
  font-size: 0.9rem;
  padding: 0.55rem 1rem;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.tab-list button:hover {
  background: #f0f0f0;
}

.tab-list button[aria-selected="true"] {
  background: var(--tab-active-bg);
  color: var(--accent);
  font-weight: 600;
  border-color: #c4d7fb;
}

.tab-list button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* --- Content --- */
.content {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2rem 1rem 3rem;
}

.panel h1 {
  font-family: var(--font);
  font-size: 1.65rem;
  margin-top: 0;
}

.lead {
  font-size: 1.05rem;
  color: var(--muted);
}

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

.panel.is-active {
  display: block;
}

.pub-list {
  padding-left: 1.25rem;
}

.pub-list li {
  margin-bottom: 1.25rem;
}

.pub-list li > span {
  display: block;
}

.pub-title {
  font-style: italic;
}

.pub-venue {
  color: var(--muted);
  font-size: 0.92rem;
}

.people-list li {
  margin-bottom: 0.5rem;
}

.contact-block dt {
  font-weight: 600;
  margin-top: 1rem;
}

.contact-block dt:first-child {
  margin-top: 0;
}

.contact-block dd {
  margin: 0.25rem 0 0;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

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

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  padding: 1.25rem 1rem;
  font-size: 0.88rem;
  color: var(--muted);
}

.site-footer .inner {
  max-width: var(--max);
  margin: 0 auto;
}

.site-footer a {
  color: var(--muted);
}

.site-footer a:hover {
  color: var(--accent);
}

@media (min-width: 40rem) {
  .content {
    padding-left: 0;
    padding-right: 0;
  }

  .tabs .tab-list,
  .site-header .inner {
    padding-left: 0;
    padding-right: 0;
  }
}