/* 重置与基础 */
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; background: #f8fafc; color: #1e293b; line-height: 1.6; }
a { text-decoration: none; color: inherit; }
/* 工具页通用布局 */
.tool-container { max-width: 1000px; margin: 30px auto; padding: 20px; background: white; border-radius: 12px; box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1); }
.tool-header { border-bottom: 2px solid #f1f5f9; padding-bottom: 15px; margin-bottom: 20px; display: flex; align-items: center; gap: 10px; }
.back-link { display: inline-block; margin-bottom: 15px; color: #64748b; font-size: 0.9rem; }
.back-link:hover { color: #2563eb; }