/* 统一导航样式 */
.site-nav{background:#fff;margin-bottom:20px;border-radius:10px;box-shadow:0 2px 12px rgba(0,0,0,0.08);overflow:hidden}
.site-nav .nav-inner{max-width:100%;padding:15px 20px;display:flex;flex-wrap:wrap;gap:10px;justify-content:center;align-items:center}
.site-nav a{display:inline-flex;align-items:center;gap:6px;padding:10px 16px;color:#555;background:#f5f6f8;border-radius:8px;text-decoration:none;font-size:14px;transition:all 0.25s;font-family:'Segoe UI Emoji','Apple Color Emoji','Noto Color Emoji',sans-serif}
.site-nav a:hover{background:linear-gradient(135deg, #667eea 0%, #764ba2 100%);color:#fff;transform:translateY(-1px)}
.site-nav a:first-child:hover{box-shadow:0 4px 12px rgba(102,126,234,0.4)}
.site-nav a.active{background:linear-gradient(135deg, #667eea 0%, #764ba2 100%);color:#fff;box-shadow:0 4px 12px rgba(102,126,234,0.3)}

/* 页面内小调整 */
body{font-family:微软雅黑,system-ui,Arial}

/* 工具介绍底部区域 */
.tool-desc-bottom{margin-top:28px;padding:18px;background:#fafafa;border:1px solid #f0f0f0;border-radius:8px;color:#444;text-align:left}
.tool-desc-bottom h3{margin:0 0 10px 0;font-size:16px;color:#222;font-weight:bold}
.tool-desc-bottom h4{margin:14px 0 8px 0;font-size:14px;color:#333;font-weight:bold}
.tool-desc-bottom .intro{color:#555;line-height:1.8;font-size:14px}
.tool-desc-bottom .usage{color:#666;line-height:1.8;font-size:14px}