/* SSCH Lab Course — Theme (matches MHL iOS Userland) */
:root {
  --bg: #ffffff;
  --text: #1a1a1a;
  --text-secondary: #4a4a4a;
  --text-muted: #6b6b6b;
  --border: #e0e0e0;
  --border-light: #f0f0f0;
  --accent: #0a0a0a;
  --accent-light: #f5f5f5;
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --max-width: 820px;
}

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

body {
  font-family: var(--sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

header {
  border-bottom: 1px solid var(--border);
  padding: 32px 0;
  margin-bottom: 48px;
}
header .container { display: flex; align-items: center; justify-content: space-between; }
.logo { font-size: 14px; font-weight: 600; letter-spacing: 0.5px; text-transform: uppercase; color: var(--text-muted); }
.logo span { color: var(--text); }

nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  margin-left: 24px;
  transition: color 0.15s;
}
nav a:hover { color: var(--text); }

h1 { font-size: 36px; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 12px; }
h2 { font-size: 24px; font-weight: 600; margin-top: 48px; margin-bottom: 16px; padding-bottom: 8px; border-bottom: 1px solid var(--border-light); }
h3 { font-size: 18px; font-weight: 600; margin-top: 32px; margin-bottom: 12px; }

p { margin-bottom: 16px; }
a { color: var(--text); }

table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 10px 16px; text-align: left; border-bottom: 1px solid var(--border-light); }
th { font-weight: 600; color: var(--text-secondary); font-size: 12px; text-transform: uppercase; letter-spacing: 0.5px; }

footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  margin-top: 64px;
  font-size: 13px;
  color: var(--text-muted);
}