:root {
  --bg: #000000;
  --surface: #111111;
  --card: #1a1a1a;
  --accent: #ffffff;
  --accent-dim: #999999;
  --text: #ffffff;
  --muted: #888888;
  --border: #2a2a2a;
  --border-hover: #555555;
  --tag-bg: rgba(255,255,255,0.08);
  --tag-text: #cccccc;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: 'Inter', -apple-system, system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--text); }

/* Hero */
.hero {
  padding: 4rem 2rem 3.5rem;
  text-align: center;
  border-bottom: 1px solid var(--border);
}
.hero-content { max-width: 820px; margin: 0 auto; }
.hero-logo {
  display: block;
  max-width: 320px;
  height: auto;
  margin: 0 auto 2.5rem;
}
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
}
.hero .subtitle {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 580px;
  margin: 0 auto 2.5rem;
  font-weight: 300;
  line-height: 1.7;
}
.hero-meta {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.hero-meta a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  transition: color 0.2s, border-color 0.2s;
}
.hero-meta a:hover { color: var(--text); border-color: var(--text); }
.hero-meta strong { color: var(--text); font-weight: 600; }
.hero-meta .sep { color: var(--border); }

/* Top navigation (new in Phase 1 for multi-page site) */
.topnav {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: center;
  gap: 2rem;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  flex-wrap: wrap;
}
.topnav a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
}
.topnav a:hover, .topnav a.active { color: var(--text); }

/* Section container */
.container { max-width: 1100px; margin: 0 auto; padding: 0 1.5rem; }
section { padding: 4.5rem 0; border-bottom: 1px solid var(--border); }
section:last-of-type { border-bottom: none; }
section h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}
section h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 2rem 0 0.75rem;
  letter-spacing: -0.01em;
}
.section-sub { color: var(--muted); margin-bottom: 2.5rem; font-size: 0.95rem; font-weight: 300; }

/* Prose inside generated content (syllabus, week pages) */
.prose p { color: var(--tag-text); font-weight: 300; margin-bottom: 1rem; font-size: 0.95rem; }
.prose ul, .prose ol { margin: 0 0 1.25rem 1.5rem; color: var(--tag-text); font-weight: 300; font-size: 0.95rem; }
.prose li { padding: 0.15rem 0; }
.prose strong { color: var(--text); font-weight: 600; }
.prose em { color: var(--tag-text); font-style: italic; }
.prose code {
  font-family: 'SF Mono', Monaco, monospace;
  font-size: 0.85em;
  background: var(--surface);
  padding: 0.1em 0.4em;
  border: 1px solid var(--border);
  color: var(--tag-text);
}
.prose a { color: var(--text); text-decoration: none; border-bottom: 1px solid var(--border-hover); }
.prose a:hover { border-color: var(--text); }
.prose hr { border: none; border-top: 1px solid var(--border); margin: 2.5rem 0; }
.prose blockquote {
  border-left: 2px solid var(--border-hover);
  padding-left: 1rem;
  margin: 1rem 0;
  color: var(--muted);
}

/* Data tables (grading, assignments) */
.data-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; margin: 1.25rem 0; }
.data-table th {
  text-align: left;
  padding: 0.75rem 1rem;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
  font-weight: 500;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.data-table td {
  padding: 0.6rem 1rem;
  border-bottom: 1px solid var(--border);
  font-weight: 300;
  color: var(--tag-text);
  vertical-align: top;
}
.data-table tr:hover td { background: var(--surface); }
.data-table td strong { color: var(--text); }

/* Highlights grid */
.highlights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
.highlight-card {
  background: var(--bg);
  padding: 2rem;
}
.highlight-card h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  letter-spacing: 0.01em;
  margin-top: 0;
}
.highlight-card p { color: var(--muted); font-size: 0.85rem; font-weight: 300; line-height: 1.7; }

/* Schedule */
.schedule-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.schedule-table th {
  text-align: left;
  padding: 0.75rem 1rem;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
  font-weight: 500;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.schedule-table td {
  padding: 0.6rem 1rem;
  border-bottom: 1px solid var(--border);
  font-weight: 300;
}
.schedule-table tr:hover td { background: var(--surface); }
.schedule-table .week-num { color: var(--muted); font-variant-numeric: tabular-nums; font-weight: 400; }
.schedule-table .break-row td { color: var(--muted); font-style: italic; }
.schedule-table td a {
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid var(--border-hover);
  transition: border-color 0.2s, color 0.2s;
}
.schedule-table td a:hover { border-color: var(--text); }
.tag {
  display: inline-block;
  font-size: 0.65rem;
  padding: 0.15rem 0.5rem;
  border: 1px solid var(--border);
  font-weight: 500;
  vertical-align: middle;
  margin-left: 0.3rem;
  letter-spacing: 0.02em;
  color: var(--tag-text);
}
a.tag {
  text-decoration: none;
  transition: border-color 0.2s, color 0.2s;
}
a.tag:hover {
  border-color: var(--text);
  color: var(--text);
}

/* Textbook callout */
.callout {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 2.5rem;
  display: flex;
  gap: 2rem;
  align-items: center;
  flex-wrap: wrap;
}
.callout-text { flex: 1; min-width: 280px; }
.callout-text h2 { margin-bottom: 0.75rem; }
.callout-text p { color: var(--muted); margin-bottom: 1.5rem; font-weight: 300; }
.btn {
  display: inline-block;
  padding: 0.65rem 1.5rem;
  font-weight: 500;
  text-decoration: none;
  font-size: 0.85rem;
  transition: all 0.2s;
  letter-spacing: 0.01em;
}
.btn-primary {
  background: var(--text);
  color: var(--bg);
}
.btn-primary:hover { background: #cccccc; }
.btn-outline {
  border: 1px solid var(--border);
  color: var(--muted);
  margin-left: 0.75rem;
}
.btn-outline:hover { border-color: var(--text); color: var(--text); }

/* Info cards row */
.info-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
.info-card {
  background: var(--bg);
  padding: 2rem;
}
.info-card h3 {
  font-size: 0.75rem;
  font-weight: 500;
  margin-bottom: 1rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 0;
}
.info-card ul { list-style: none; padding: 0; margin: 0; }
.info-card li { padding: 0.25rem 0; color: var(--tag-text); font-size: 0.9rem; font-weight: 300; }
.info-card li::before { content: '\2014'; margin-right: 0.75rem; color: var(--border-hover); }

/* Footer */
footer {
  padding: 3rem 1.5rem;
  color: var(--muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
}
footer .footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}
footer a { color: var(--muted); text-decoration: none; transition: color 0.2s; }
footer a:hover { color: var(--text); }
footer .footer-links { display: flex; gap: 1.5rem; }
.footer-logo {
  height: 40px;
  width: auto;
  opacity: 0.85;
}

/* Enrollment banner */
.enroll-banner {
  border-bottom: 1px solid var(--border);
  padding: 3rem 1.5rem;
  text-align: center;
}
.enroll-banner .container { max-width: 720px; }
.enroll-banner h2 {
  font-size: 1.35rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  letter-spacing: -0.01em;
}
.enroll-notice {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  text-align: left;
  margin-bottom: 1.75rem;
}
.enroll-notice .notice-item {
  display: flex;
  gap: 1rem;
  align-items: baseline;
  font-size: 0.95rem;
  font-weight: 300;
  color: var(--tag-text);
  line-height: 1.6;
}
.enroll-notice .notice-label {
  flex-shrink: 0;
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text);
  border: 1px solid var(--border-hover);
  padding: 0.2rem 0.6rem;
  white-space: nowrap;
}
.enroll-cta {
  font-size: 1rem;
  color: var(--text);
  font-weight: 400;
}
.enroll-cta a {
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid var(--border-hover);
  transition: border-color 0.2s;
}
.enroll-cta a:hover { border-color: var(--text); }

/* Page header (for non-landing pages) */
.page-header {
  padding: 4rem 1.5rem 2rem;
  text-align: center;
  border-bottom: 1px solid var(--border);
}
.page-header h1 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}
.page-header .eyebrow {
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 1rem;
  font-weight: 500;
}
.page-header p { color: var(--muted); max-width: 640px; margin: 0 auto; font-weight: 300; }

@media (max-width: 640px) {
  .hero { padding: 3rem 1.25rem 2.5rem; }
  .hero-logo { max-width: 240px; }
  .hero-meta { flex-direction: column; gap: 0.5rem; }
  .callout { flex-direction: column; padding: 1.75rem; }
  .btn-outline { margin-left: 0; margin-top: 0.5rem; }
  .highlights, .info-row { grid-template-columns: 1fr; }
  footer .footer-inner { flex-direction: column; text-align: center; }
  .topnav { gap: 1rem; padding: 1rem; }
}

/* Readings page */
.readings-week {
  margin: 2.5rem 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}
.readings-week h3 {
  font-size: 1.15rem;
  margin: 0 0 1rem 0;
  font-weight: 600;
}
.readings-week h4 {
  font-size: 0.95rem;
  margin: 1rem 0 0.35rem 0;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.readings-week ul { margin: 0 0 0.5rem 1.25rem; }
.readings-week li { margin-bottom: 0.65rem; line-height: 1.4; }
.readings-week .dim { color: var(--muted); font-size: 0.9em; font-style: italic; }

/* Small PDF pill next to the slide-HTML link in the schedule */
.schedule-table .tag-slides {
  font-size: 0.65rem;
  padding: 0.1em 0.5em;
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border-hover);
  border-radius: 0.3em;
  text-decoration: none;
  margin-left: 0.35em;
  font-weight: 600;
  letter-spacing: 0.04em;
}
.schedule-table .tag-slides:hover {
  color: var(--text);
  border-color: var(--text);
}