:root {
  --bg: #f4f8fb;
  --fg: #16232e;
  --muted: #55677a;
  --card: #ffffff;
  --line: #d6e0e8;
  --accent: #1a6fa8;
  --accent-ink: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1a22;
    --fg: #e8eef3;
    --muted: #9fb0bf;
    --card: #172530;
    --line: #2a3b48;
    --accent: #5cb2ea;
    --accent-ink: #0f1a22;
  }
}

* { box-sizing: border-box; }

html, body { margin: 0; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 0 16px;
}

.hero {
  text-align: center;
  padding: 3rem 0 1.5rem;
}

.hero .mark { display: block; margin: 0 auto 0.75rem; }

.hero h1 {
  margin: 0 0 0.4rem;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  letter-spacing: 0.01em;
}

.hero p { margin: 0; color: var(--muted); }

.apps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 340px));
  justify-content: center;
  gap: 1.25rem;
  padding: 1rem 0 2rem;
  flex: 1;
}

.app {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.6rem;
  padding: 1.5rem 1.25rem 1.25rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  color: inherit;
  text-decoration: none;
  transition: transform 120ms ease, box-shadow 120ms ease;
}

.app:hover, .app:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  outline: none;
  border-color: var(--accent);
}

.app img { display: block; }

.app h2 { margin: 0.25rem 0 0; font-size: 1.3rem; }

.app p { margin: 0; color: var(--muted); font-size: 0.95rem; }

.app .go {
  margin-top: 0.5rem;
  padding: 0.45rem 1.4rem;
  border-radius: 999px;
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 600;
}

footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  padding: 1rem 0 2rem;
}