*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.5;
  color: #1a1a2e;
  background: #f5f6fa;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

header h1 {
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
  font-weight: 700;
}

.subtitle {
  margin: 0 0 1.5rem;
  color: #555;
  font-size: 0.95rem;
}

.tools h2 {
  margin: 0 0 1rem;
  font-size: 1.35rem;
}

.tool-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.tool-list li + li {
  margin-top: 0.75rem;
}

.tool-list a {
  display: block;
  padding: 1rem 1.25rem;
  background: #fff;
  border: 1px solid #e0e3eb;
  border-radius: 10px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.tool-list a:hover {
  border-color: #4a6cf7;
  box-shadow: 0 4px 12px rgba(74, 108, 247, 0.12);
}

.tool-name {
  display: block;
  font-weight: 600;
  color: #4a6cf7;
  margin-bottom: 0.25rem;
}

.tool-desc {
  display: block;
  font-size: 0.9rem;
  color: #555;
}

@media (max-width: 480px) {
  .container {
    padding: 1.25rem 1rem 2rem;
  }
}