:root {
  --color-bg: #f6f7fb;
  --color-surface: #ffffff;
  --color-text: #1c2430;
  --color-muted: #5a6675;
  --color-accent: #2f6fed;
  --color-accent-strong: #1c4fd0;
  --color-border: #e2e6ee;
  --focus-ring: #f5a623;
  --radius: 12px;
  --shadow: 0 4px 14px rgba(28, 36, 48, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
}

#app {
  max-width: 900px;
  margin: 0 auto;
  padding: 32px 20px 48px;
}

.page-header {
  text-align: center;
  margin-bottom: 28px;
}

.page-header h1 {
  margin: 0 0 8px;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
}

.page-header .lead {
  margin: 0;
  color: var(--color-muted);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

.tiles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 20px;
}

.tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 28px 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.tile:hover {
  border-color: var(--color-accent);
  box-shadow: 0 8px 20px rgba(28, 36, 48, 0.12);
  transform: translateY(-2px);
}

.tile:active {
  transform: translateY(0);
}

.tile img {
  width: 48px;
  height: 48px;
  color: var(--color-accent);
  pointer-events: none;
}

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

.status {
  margin-top: 32px;
  text-align: center;
  font-size: 1.05rem;
  color: var(--color-muted);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 14px 18px;
  min-height: 1.5em;
}

@media (prefers-reduced-motion: reduce) {
  .tile {
    transition: none;
  }
}