:root {
  color-scheme: light dark;
  --bg: #f5f5f4;
  --fg: #1c1917;
  --muted: #78716c;
  --card-bg: #ffffff;
  --card-border: #e7e5e4;
  --accent: #0f766e;
  --shadow: 0 1px 2px rgba(28, 25, 23, 0.04);
  --shadow-hover: 0 10px 24px rgba(28, 25, 23, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1917;
    --fg: #f5f5f4;
    --muted: #a8a29e;
    --card-bg: #292524;
    --card-border: #3f3a37;
    --accent: #2dd4bf;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-hover: 0 12px 28px rgba(0, 0, 0, 0.4);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 4.5rem 1.5rem 3rem;
}

header {
  margin-bottom: 2.5rem;
}

h1 {
  font-size: 1.6rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
  text-transform: lowercase;
  letter-spacing: 0.02em;
}

.tagline {
  margin: 0;
  max-width: 46ch;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.55;
}

#tiles {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
}

.tile {
  display: block;
  padding: 1.25rem;
  border-radius: 0.85rem;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  color: inherit;
  text-decoration: none;
  box-shadow: var(--shadow);
  transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}

.tile:hover,
.tile:focus-visible {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

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

.tile-icon {
  font-size: 1.75rem;
  line-height: 1;
  margin-bottom: 0.6rem;
}

.tile-name {
  font-weight: 600;
  font-size: 1.05rem;
}

.tile-description {
  margin-top: 0.35rem;
  font-size: 0.88rem;
  color: var(--muted);
}

footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--card-border);
  color: var(--muted);
  font-size: 0.8rem;
}

footer p {
  margin: 0;
}

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