/* ============================================================================
   CS6140 shared site style — used by index.html, aboutcs6140.html,
   schedulen_mod.html. Modern visual layer; plain CSS, no build step.
   ============================================================================ */

:root {
  --ink: #1c2530;
  --muted: #5b6b7a;
  --accent: #2159a6;
  --accent-dark: #16386f;
  --accent-light: #eaf2ff;
  --page-bg: #dfe3e8;
  --card-bg: #ffffff;
  --border: #dde3ea;
  --radius: 10px;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-serif: Palatino, "Palatino Linotype", Georgia, serif;
}

* { box-sizing: border-box; }

html, body {
  background: var(--page-bg);
  color: var(--ink);
  font-family: var(--font-body);
  margin: 0;
  padding: 0;
}

.site-wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 18px 40px 18px;
}

/* ---- Header / title banner ---- */

.site-title {
  background: var(--card-bg);
  color: var(--ink);
  padding: 14px 22px;
  margin: 0 0 2px 0;
  font-size: 1.15em;
  font-weight: 600;
  border-bottom: 2px solid var(--border);
}

/* ---- Nav bar ---- */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  align-items: center;
  background: var(--accent-dark);
  padding: 4px 14px 4px max(18px, calc(50vw - 582px));
  margin: 0 0 20px 0;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.site-nav a {
  color: #ffe27a;
  text-decoration: none;
  font-weight: 500;
  font-size: 0.82em;
  padding: 5px 9px;
  border-radius: 5px;
  transition: background-color 0.15s ease;
}

.site-nav a:hover {
  background: rgba(255, 255, 255, 0.15);
}

.site-nav a.current {
  background: rgba(255, 255, 255, 0.22);
  color: #fff;
}

/* ---- Generic content cards used on about/index pages ---- */

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 22px;
  margin-bottom: 18px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.card h2 {
  margin-top: 0;
  color: var(--accent-dark);
  font-family: var(--font-body);
  font-size: 1.15em;
  border-bottom: 1px solid var(--border);
  padding-bottom: 6px;
}

.card ul {
  padding-left: 22px;
  margin: 8px 0;
}

.note-box {
  background: var(--accent-light);
  border-left: 4px solid var(--accent);
  padding: 10px 16px;
  border-radius: 6px;
  font-size: 0.92em;
  color: var(--muted);
  margin: 10px 0;
}

.footer-space {
  height: 30px;
}