body { margin:0; font-family: 'Segoe UI', 'PingFang SC', Arial, sans-serif; background: #f6f8fa; color: #222; }
header { background: #222; color: #fff; padding: 32px 0 24px 0; text-align: center; }
header h1 { margin: 0 0 8px 0; font-size: 2.5em; letter-spacing: 2px; }
header p { margin: 0; font-size: 1.2em; color: #bbb; }
nav { background: #fff; box-shadow: 0 2px 8px #0001; padding: 12px 0; }
nav ul { display: flex; flex-wrap: wrap; justify-content: center; gap: 24px; list-style: none; margin: 0; padding: 0; }
nav li { }
nav a { color: #222; text-decoration: none; font-weight: 500; padding: 6px 12px; border-radius: 6px; transition: background 0.2s; }
nav a:hover { background: #f0f0f0; }
nav a.active { background: #e3f0fd; color: #1a73e8; }
.container { max-width: 1100px; margin: 32px auto; padding: 0 16px; }
.section { margin-bottom: 40px; }
.section h2 { font-size: 1.5em; margin-bottom: 18px; color: #1a73e8; }
.tools-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; }
.tool-card { background: #fff; border-radius: 12px; box-shadow: 0 2px 8px #0001; padding: 20px; transition: box-shadow 0.2s; display: flex; flex-direction: column; }
.tool-card:hover { box-shadow: 0 4px 16px #0002; }
.tool-title { font-size: 1.1em; font-weight: bold; margin-bottom: 8px; color: #222; }
.tool-desc { font-size: 0.98em; color: #555; flex: 1; }
.tool-link { margin-top: 12px; text-align: right; }
.tool-link a { color: #1a73e8; text-decoration: none; font-size: 0.98em; }
.tool-link a:hover { text-decoration: underline; }
@media (max-width: 600px) {
  header h1 { font-size: 1.5em; }
  .container { padding: 0 6px; }
}