:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --text: #1a1a1a;
  --muted: #5c5c66;
  --border: #dcdce2;
  --accent: #2455d6;
  --accent-contrast: #ffffff;
  --radius: 10px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111216;
    --surface: #1b1d23;
    --text: #ececf1;
    --muted: #a0a0ad;
    --border: #2d3039;
    --accent: #7fa4ff;
    --accent-contrast: #111216;
  }
}

*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 1rem/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; }

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

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.container {
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 1.5rem 1rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.skip-link {
  position: absolute;
  left: 0.5rem;
  top: -4rem;
  background: var(--accent);
  color: var(--accent-contrast);
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  z-index: 20;
}
.skip-link:focus { top: 0.5rem; }

/* Header and nav */
.site-header {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.brand {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
  text-decoration: none;
}

.menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
}

.menu-icon,
.menu-icon::before,
.menu-icon::after {
  display: block;
  width: 20px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  transition: transform 0.2s, opacity 0.2s;
}
.menu-icon { position: relative; }
.menu-icon::before, .menu-icon::after { content: ""; position: absolute; left: 0; }
.menu-icon::before { top: -6px; }
.menu-icon::after { top: 6px; }

.menu-toggle[aria-expanded="true"] .menu-icon { background: transparent; }
.menu-toggle[aria-expanded="true"] .menu-icon::before { top: 0; transform: rotate(45deg); }
.menu-toggle[aria-expanded="true"] .menu-icon::after { top: 0; transform: rotate(-45deg); }

.site-nav {
  position: absolute;
  top: 100%;
  right: 0;
  min-width: 220px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0 0 var(--radius) var(--radius);
  z-index: 10;
}
.site-nav[hidden] { display: none; }
.site-nav ul { list-style: none; margin: 0; padding: 0.25rem; }
.site-nav a {
  display: block;
  padding: 0.6rem 0.9rem;
  border-radius: 6px;
  color: var(--text);
  text-decoration: none;
}
.site-nav a:hover { background: var(--bg); }
.site-nav a[aria-current="page"] { font-weight: 700; color: var(--accent); }

/* Cards */
.lead { color: var(--muted); margin-top: 0; }

.card-grid {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
}

.card {
  display: block;
  height: 100%;
  padding: 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  text-decoration: none;
  transition: border-color 0.15s, transform 0.15s;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card h2 { margin: 0 0 0.4rem; font-size: 1.15rem; color: var(--accent); }
.card p { margin: 0; color: var(--muted); }

.status { color: var(--muted); }

.site-footer { color: var(--muted); font-size: 0.9rem; }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}

/* Desktop: nav inline would also work, but keep the hamburger everywhere by design. */