/* ============================================================
   Site styles. Colors are defined once here; dark mode swaps them.
   ============================================================ */

:root {
  --bg: #fbfaf7;
  --text: #1d2125;
  --muted: #5b626b;
  --faint: #8a9099;
  --rule: #e3dfd6;
  --accent: #9b1b30;
  --accent-hover: #7a1325;
  --chip-bg: #f3efe8;
  --chip-border: #e3dfd6;
  --target: #fbf1e0;
  --nav-bg: rgba(251, 250, 247, 0.92);
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181b;
    --text: #e7e5e0;
    --muted: #a6acb4;
    --faint: #7c838c;
    --rule: #2d3136;
    --accent: #ec8f9c;
    --accent-hover: #f5b3bc;
    --chip-bg: #22252a;
    --chip-border: #33373d;
    --target: #2a2520;
    --nav-bg: rgba(22, 24, 27, 0.92);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 4.5rem; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; text-underline-offset: 2px; }

main, .topnav-inner, .footer {
  max-width: 50rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ---------- Top navigation ---------- */
.topnav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--nav-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}
.topnav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: 3.25rem;
}
.topnav-name {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text);
  white-space: nowrap;
}
.topnav-name:hover { color: var(--text); text-decoration: none; }
.topnav-links { display: flex; gap: 1.25rem; font-size: 0.95rem; }
.topnav-links a { color: var(--muted); white-space: nowrap; }
.topnav-links a:hover { color: var(--accent); text-decoration: none; }

/* ---------- Header ---------- */
.hero {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 3rem 0 1.5rem;
}
.hero-photo {
  width: 168px;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 14px;
  flex-shrink: 0;
}
.hero h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 2.4rem;
  line-height: 1.1;
  margin: 0 0 0.4rem;
  letter-spacing: -0.01em;
}
.hero-title { margin: 0 0 1rem; color: var(--muted); font-size: 1.05rem; line-height: 1.45; }
.hero-title a { color: var(--muted); }
.hero-title a:hover { color: var(--accent); }
.hero-links { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.hero-links a {
  display: inline-block;
  padding: 0.3rem 0.75rem;
  border: 1px solid var(--chip-border);
  border-radius: 999px;
  background: var(--chip-bg);
  font-size: 0.88rem;
  color: var(--text);
}
.hero-links a:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }

.about p { margin: 0.5rem 0 0; }

/* ---------- Sections ---------- */
section { padding-top: 1.5rem; }
h2 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.75rem;
  margin: 2rem 0 0.5rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--rule);
}
h3 {
  font-family: var(--sans);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--faint);
  margin: 2rem 0 0.75rem;
}
h3 a { color: inherit; text-decoration: underline; text-decoration-color: var(--rule); text-underline-offset: 3px; }
h3 a:hover { color: var(--accent); }
.note { color: var(--muted); font-size: 0.9rem; margin: -0.25rem 0 1rem; }

/* ---------- Paper lists ---------- */
.papers { list-style: none; padding: 0; margin: 0; }
.paper {
  padding: 0.85rem 0.9rem;
  margin: 0 -0.9rem;
  border-radius: 10px;
  transition: background-color 0.6s;
}
.paper:target { background: var(--target); }
.paper-title {
  font-family: var(--serif);
  font-size: 1.12rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--text);
}
.paper-title:hover { color: var(--accent); }
.paper-meta { color: var(--muted); font-size: 0.93rem; margin-top: 0.15rem; }
.paper-meta cite { font-style: italic; }

.links { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.45rem; }
.links a, .links button {
  font: inherit;
  font-size: 0.8rem;
  line-height: 1;
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--chip-border);
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}
.links a:hover, .links button:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.links button::after { content: " ▸"; }
.links button[aria-expanded="true"] { background: var(--chip-bg); color: var(--text); }
.links button[aria-expanded="true"]::after { content: " ▾"; }

.abstract {
  margin-top: 0.6rem;
  padding: 0.1rem 0 0.1rem 1rem;
  border-left: 2px solid var(--rule);
  font-size: 0.93rem;
  color: var(--muted);
}
.abstract p { margin: 0.25rem 0; }
.media { margin-top: 0.45rem; font-size: 0.85rem; color: var(--faint); }

/* Work in progress */
.wip { list-style: none; padding: 0; margin: 0; }
.wip li { padding: 0.45rem 0; }
.wip-title { font-family: var(--serif); font-size: 1.05rem; }
.wip-with { display: block; color: var(--muted); font-size: 0.9rem; }

/* Dated lists (policy, CV) */
.dated { list-style: none; padding: 0; margin: 0; }
.dated li {
  position: relative;
  padding: 0.35rem 0 0.35rem 7.5rem;
}
.dated .date {
  position: absolute;
  left: 0;
  top: 0.45rem;
  color: var(--faint);
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}
.dated .outlet { display: block; color: var(--muted); font-size: 0.88rem; font-style: italic; }
.coverage { color: var(--muted); font-size: 0.93rem; margin-top: 0.75rem; }

.button {
  display: inline-block;
  padding: 0.55rem 1.1rem;
  border-radius: 8px;
  background: var(--accent);
  color: var(--bg);
  font-weight: 600;
  font-size: 0.95rem;
}
.button:hover { background: var(--accent-hover); color: var(--bg); text-decoration: none; }

/* ---------- Footer ---------- */
.footer {
  margin-top: 4rem;
  padding-top: 1.5rem;
  padding-bottom: 3rem;
  border-top: 1px solid var(--rule);
  color: var(--faint);
  font-size: 0.85rem;
}

/* ---------- Phones ---------- */
@media (max-width: 640px) {
  body { font-size: 16px; }
  .topnav-name { display: none; }
  .topnav-inner { justify-content: center; }
  .hero { flex-direction: column; align-items: flex-start; gap: 1.25rem; padding-top: 2rem; }
  .hero-photo { width: 128px; }
  .hero h1 { font-size: 2rem; }
  .dated li { padding-left: 0; }
  .dated .date { position: static; display: block; }
}