* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', sans-serif;
  background: #f5f5f5;
  color: #333;
  line-height: 1.7;
}

header {
  background: #fff;
  border-bottom: 1px solid #e0e0e0;
  padding: 1rem 0;
}

.header-inner {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.logo {
  font-size: 1.2rem;
  font-weight: bold;
  color: #1a73e8;
  text-decoration: none;
}

main {
  max-width: 800px;
  margin: 2rem auto;
  padding: 0 1.5rem;
}

.hero {
  text-align: center;
  padding: 3rem 0 2rem;
}

.hero h1 {
  font-size: 2rem;
  font-weight: bold;
  margin-bottom: 0.5rem;
}

.hero p {
  color: #666;
  font-size: 1.1rem;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.tool-card {
  background: #fff;
  border-radius: 12px;
  padding: 1.5rem;
  border: 1px solid #e0e0e0;
  text-decoration: none;
  color: #333;
  display: flex;
  gap: 1rem;
  transition: box-shadow 0.2s, transform 0.2s;
}

.tool-card:hover {
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  transform: translateY(-2px);
}

.tool-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.tool-body h2 {
  font-size: 1.1rem;
  font-weight: bold;
  margin-bottom: 0.4rem;
}

.tool-body p {
  font-size: 0.875rem;
  color: #666;
  margin-bottom: 0.8rem;
}

.tool-link {
  font-size: 0.875rem;
  color: #1a73e8;
  font-weight: 500;
}

footer {
  text-align: center;
  padding: 2rem;
  color: #999;
  font-size: 0.875rem;
  margin-top: 3rem;
}

@media (max-width: 600px) {
  .hero h1 {
    font-size: 1.5rem;
  }

  .tools-grid {
    grid-template-columns: 1fr;
  }
}

footer a {
  color: #999;
  text-decoration: none;
  margin: 0 0.5rem;
}

footer a:hover {
  color: #1a73e8;
}

footer p {
  margin-bottom: 0.3rem;
}