/* Homepage (index.html) — CMU-themed landing page for the lecture decks */

:root {
  --cmu-purple:   #5d2c80;
  --cmu-purple-2: #7b46a3;
  --ink:          #1d1f24;
  --muted:        #5b6270;
  --accent:       #d4711f;
  --panel:        #f5f3f9;
  --border:       #e4def0;
}

body {
  font-family: "Inter", "Sarabun", system-ui, sans-serif;
  color: var(--ink);
  background: #ffffff;
  margin: 0;
}

main.content, .page-columns, #quarto-content {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

.lead {
  font-size: 1.05rem;
  color: var(--muted);
  line-height: 1.6;
  margin: 1.5rem 0 2.5rem;
}
.lead strong { color: var(--ink); }
.lead code {
  background: var(--panel);
  color: var(--cmu-purple);
  padding: 0.05em 0.4em;
  border-radius: 4px;
  font-size: 0.9em;
}

h2.section, h2 {
  color: var(--cmu-purple);
  font-weight: 700;
  border-bottom: 3px solid var(--cmu-purple);
  padding-bottom: 0.3rem;
  margin: 2.5rem 0 1.25rem;
  letter-spacing: -0.01em;
}

/* Disclaimer — content under review */
.disclaimer {
  margin: 0 0 2rem;
  padding: 0.85rem 1.2rem;
  background: #fdf4e7;
  border: 1px solid #f0d9b5;
  border-left: 5px solid var(--accent);
  border-radius: 10px;
  font-size: 0.95rem;
  line-height: 1.6;
  color: #7a4d12;
}
.disclaimer strong { color: #5c3a0d; }

/* Lecture tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1rem;
  font-size: 1rem;
}
th, td {
  text-align: left;
  padding: 0.55rem 0.8rem;
  border-bottom: 1px solid var(--border);
}
thead th {
  color: var(--cmu-purple);
  font-weight: 700;
  border-bottom: 2px solid var(--cmu-purple-2);
}
/* first column = lecture number */
td:first-child, th:first-child {
  width: 3rem;
  text-align: right;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
tbody tr:hover { background: var(--panel); }
td a { color: var(--cmu-purple-2); font-weight: 600; text-decoration: none; }
td a:hover { color: var(--accent); text-decoration: underline; }

/* Attribution / credit box */
.credit {
  margin-top: 3rem;
  padding: 1.1rem 1.35rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-left: 5px solid var(--accent);
  border-radius: 10px;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--muted);
}
.credit strong { color: var(--ink); }
.credit a { color: var(--cmu-purple-2); font-weight: 600; }

/* Title banner tweak */
.quarto-title-block .quarto-title .title { font-weight: 700; letter-spacing: -0.01em; }
.quarto-title-block .subtitle { font-weight: 400; opacity: 0.92; }