:root {
  --bg: #f4f6f8;
  --card: #ffffff;
  --text: #1c2733;
  --muted: #64748b;
  --accent: #0e7c66;
  --accent-soft: #e0f2ee;
  --border: #d7dee5;
  --radius: 12px;
}

* {
  box-sizing: border-box;
}

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

.container {
  max-width: 640px;
  margin: 0 auto;
  padding: 48px 16px 48px;
}

header h1 {
  font-size: 1.8rem;
  margin: 0 0 4px;
}

.subtitle {
  color: var(--muted);
  margin: 0 0 32px;
}

.tools {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 560px) {
  .tools {
    grid-template-columns: repeat(2, 1fr);
  }
}

.tool-card {
  display: flex;
  flex-direction: column;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.tool-card:hover,
.tool-card:focus-visible {
  border-color: var(--accent);
  box-shadow: 0 2px 8px rgba(14, 124, 102, 0.12);
  outline: none;
}

.tool-card h2 {
  font-size: 1.1rem;
  margin: 0 0 8px;
}

.tool-card p {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0;
  flex: 1;
}

.tool-link {
  margin-top: 16px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
}

footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.8rem;
  margin-top: 48px;
}