/* style.css -- root app launcher. Mobile-first, single file, no
   frameworks. Conventions ported from the ddr_drills app. */

:root {
  --bg: #f5f6f8;
  --panel: #ffffff;
  --ink: #1b2230;
  --ink-dim: #5a6474;
  --accent: #1f5fa8;
  --accent-soft: #e3ecf7;
  --border: #d4d9e0;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               Helvetica, Arial, sans-serif;
  line-height: 1.45;
}

.app-header {
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  padding: 1rem 1rem 0.75rem;
}

.app-header h1 {
  margin: 0;
  font-size: 1.4rem;
}

.tagline {
  margin: 0.25rem 0 0.75rem;
  color: var(--ink-dim);
  font-size: 0.9rem;
}

main {
  max-width: 44rem;
  margin: 0 auto;
  padding: 0.75rem;
}

#tiles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

.tile {
  display: block;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem;
  text-decoration: none;
  color: var(--ink);
}

.tile:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.tile-name {
  display: block;
  font-size: 1.1rem;
  font-weight: bold;
  color: var(--accent);
  margin-bottom: 0.25rem;
}

.tile-blurb {
  display: block;
  font-size: 0.9rem;
  color: var(--ink-dim);
}

.app-footer {
  max-width: 44rem;
  margin: 0 auto;
  padding: 0.5rem 0.75rem 1.5rem;
  color: var(--ink-dim);
  font-size: 0.8rem;
}

@media (min-width: 40rem) {
  #tiles {
    grid-template-columns: 1fr 1fr;
  }

  .app-header h1 {
    font-size: 1.6rem;
  }
}