/* ──────────────────────────────────────
   Jesse Wolfson – jpwolfson.com
   Clean, minimal academic site
   ────────────────────────────────────── */

:root {
  --text:    #1a1a1a;
  --muted:   #555;
  --accent:  #1a4a7a;   /* dark navy for links */
  --bg:      #ffffff;
  --border:  #e0e0e0;
  --max:     1100px;
  --nav-gap: 1.4rem;
}

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

html {
  font-size: 17px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue",
               Arial, sans-serif;
  line-height: 1.65;
}

/* ── Header ─────────────────────────── */
header {
  border-bottom: 1px solid var(--border);
  padding: 1.2rem 2rem 0;
  max-width: var(--max);
  margin: 0 auto;
}

.site-title {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 0.9rem;
}

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

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

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0 var(--nav-gap);
  margin-bottom: -1px;        /* sit on top of header border */
}

nav a {
  display: inline-block;
  padding: 0.35rem 0 0.55rem;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.88rem;
  border-bottom: 2px solid transparent;
  transition: color .15s, border-color .15s;
}

nav a:hover,
nav a[aria-current="page"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ── Main content ───────────────────── */
main {
  max-width: var(--max);
  margin: 2.5rem auto 4rem;
  padding: 0 2rem;
}

h1 {
  font-size: 1.7rem;
  font-weight: 600;
  margin: 0 0 1.5rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 2rem 0 0.6rem;
}

h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 1.5rem 0 0.4rem;
}

p { margin: 0 0 1rem; }

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

a:hover { text-decoration: underline; }

ol, ul {
  margin: 0 0 1rem;
  padding-left: 1.6rem;
}

li { margin-bottom: 0.4rem; }

/* Nested lists (corrigenda, sub-talks) */
li > ol, li > ul {
  margin-top: 0.3rem;
  margin-bottom: 0.3rem;
}

/* Section label for papers, talks */
.section-label {
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 2rem 0 0.6rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.3rem;
}

/* Working group member lists */
.member-section h2 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--muted);
  margin: 1.8rem 0 0.4rem;
}

/* Blockquote (NYT review) */
blockquote {
  margin: 1.2rem 0 1.2rem 1.5rem;
  padding-left: 1rem;
  border-left: 3px solid var(--border);
  color: var(--muted);
  font-style: italic;
}

blockquote p { margin-bottom: 0.3rem; }

/* ── Footer ─────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  max-width: var(--max);
  margin: 0 auto;
  padding: 1rem 2rem;
  font-size: 0.82rem;
  color: var(--muted);
}

/* ── Responsive video embeds ─────────── */
.video-wrapper {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 */
  height: 0;
  overflow: hidden;
  max-width: 100%;
  margin: 1.5rem 0;
}

.video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* ── Responsive ─────────────────────── */
@media (max-width: 600px) {
  header, main, footer { padding-left: 1.1rem; padding-right: 1.1rem; }
  nav { gap: 0 1rem; }
  nav a { font-size: 0.82rem; }
}