:root {
  --green-dark: #1f3a26;
  --green:      #2f6a3c;
  --green-soft: #e6f0e8;
  --bark:       #5b3a1e;
  --sand:       #f7f3ec;
  --ink:        #1c1c1c;
  --muted:      #5b5b5b;
  --line:       #d9d5cc;
  --accent:     #b8531a;
  --code-bg:    #1e1f23;
  --code-fg:    #e8e8e8;
  --good:       #2e7d32;
  --warn:       #c0392b;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16.5px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--sand);
}

.layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  min-height: 100vh;
}

aside.sidebar {
  background: var(--green-dark);
  color: #fff;
  padding: 24px 18px;
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  overflow-y: auto;
}

aside.sidebar h1 {
  font-size: 17px;
  margin: 0 0 4px 0;
  letter-spacing: 0.2px;
}

aside.sidebar .subtitle {
  font-size: 12.5px;
  color: #c6d6c9;
  margin-bottom: 18px;
}

aside.sidebar nav h3 {
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: #9ec2a4;
  margin: 18px 0 6px 0;
  border-bottom: 1px solid #355a3d;
  padding-bottom: 4px;
}

aside.sidebar nav a {
  display: block;
  color: #e6f0e8;
  text-decoration: none;
  padding: 4px 6px;
  border-radius: 4px;
  font-size: 14px;
  margin: 1px 0;
}

aside.sidebar nav a:hover { background: #355a3d; }
aside.sidebar nav a.current { background: var(--accent); color: #fff; }

main {
  padding: 36px 56px 80px 56px;
  max-width: 1000px;
}

main h1 {
  font-size: 32px;
  margin: 0 0 6px 0;
  color: var(--green-dark);
  letter-spacing: -0.3px;
}

main .lead {
  font-size: 17px;
  color: var(--muted);
  margin-bottom: 28px;
}

main h2 {
  font-size: 22px;
  margin-top: 36px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--green);
  color: var(--green-dark);
}

main h3 {
  font-size: 17.5px;
  margin-top: 24px;
  color: var(--bark);
}

main h4 { margin-top: 18px; color: var(--ink); }

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

table {
  border-collapse: collapse;
  width: 100%;
  margin: 14px 0 22px 0;
  font-size: 14.5px;
  background: #fff;
}

th, td {
  border: 1px solid var(--line);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--green-soft);
  color: var(--green-dark);
  font-weight: 600;
}

tr:nth-child(even) td { background: #fbfaf6; }

pre {
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 14px 16px;
  border-radius: 6px;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.45;
}

code {
  font-family: "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: 0.92em;
}

p code, li code, td code {
  background: #efe8d8;
  color: #2a2a2a;
  padding: 1px 5px;
  border-radius: 3px;
}

.callout {
  border-left: 4px solid var(--green);
  background: #fff;
  padding: 12px 16px;
  margin: 16px 0;
  border-radius: 4px;
}

.callout.warn  { border-left-color: var(--warn);   background: #fdecea; }
.callout.tip   { border-left-color: var(--good);   background: #eaf4ec; }
.callout.note  { border-left-color: var(--bark);   background: #f4ecd8; }
.callout.do    { border-left-color: var(--good);   background: #eaf4ec; }
.callout.dont  { border-left-color: var(--warn);   background: #fdecea; }

.callout h4 { margin: 0 0 6px 0; }

.kbd {
  display: inline-block;
  background: #fff;
  border: 1px solid #bbb;
  border-bottom-width: 2px;
  border-radius: 3px;
  padding: 1px 6px;
  font-family: monospace;
  font-size: 0.85em;
}

.pill {
  display: inline-block;
  background: var(--green-soft);
  color: var(--green-dark);
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 12px;
  font-weight: 600;
  margin-right: 6px;
}

.pill.lab { background: #fce4cb; color: var(--accent); }
.pill.lec { background: #e0e8d6; color: var(--green-dark); }
.pill.tut { background: #d8e4f3; color: #1a3a72; }
.pill.proj{ background: #f3d8e4; color: #7a1a4a; }

.day-block {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 14px 18px;
  margin: 14px 0;
}

.day-block h3 { margin-top: 0; }

.session {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 10px;
  padding: 8px 0;
  border-top: 1px dashed var(--line);
}

.session:first-of-type { border-top: none; }
.session .time {
  font-weight: 600;
  color: var(--muted);
  font-size: 13px;
}

.lab-meta {
  background: var(--green-soft);
  border: 1px solid #c7dccd;
  border-radius: 6px;
  padding: 12px 16px;
  margin: 12px 0 22px 0;
  font-size: 14.5px;
}

.lab-meta strong { color: var(--green-dark); }

footer {
  text-align: center;
  font-size: 13px;
  color: var(--muted);
  margin-top: 60px;
  padding: 14px;
  border-top: 1px solid var(--line);
}

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  aside.sidebar { position: relative; height: auto; }
  main { padding: 24px; }
}