/* 共用左列工具目录（matrix-nav）——只定义 .mx- 前缀，避免与各站原有样式撞名 */
.mx-page .wrap{max-width:1200px}
.mx-layout{display:grid;grid-template-columns:250px minmax(0,1fr);gap:26px;align-items:start}
.mx-panel{grid-column:2;grid-row:1;min-width:0}
.mx-nav{grid-column:1;grid-row:1;background:#fff;border:1px solid #e5e7eb;border-radius:12px;padding:12px 8px;position:sticky;top:16px;max-height:calc(100vh - 32px);overflow:auto;font-size:13.5px;line-height:1.45}
.mx-nav-head{display:flex;align-items:center;justify-content:space-between;padding:0 8px 8px;font-size:14px;font-weight:650;color:#111827}
.mx-nav-head span{font-size:11px;font-weight:600;color:#6b7280;background:#f3f4f6;border-radius:999px;padding:2px 7px}
.mx-group-head{display:flex;align-items:center;justify-content:space-between;width:100%;padding:12px 8px 6px;font-size:12.5px;color:#6b7280;font-weight:600;cursor:pointer;border-radius:6px;user-select:none}
.mx-group-head:hover{color:#111827}
.mx-group-head:focus-visible{outline:2px solid #047857;outline-offset:2px}
.mx-gh-end{color:#9ca3af;font-size:11.5px}
.mx-group-list{list-style:none;margin:0;padding:0}
.mx-group-list[hidden]{display:none}
.mx-item{display:block;padding:7px 8px;border-radius:6px;color:#374151;text-decoration:none;font-size:13px}
.mx-item:hover{background:#f3f4f6;color:#111827}
.mx-item:focus-visible{outline:2px solid #047857;outline-offset:2px}
.mx-item[aria-current]{background:#ecfdf5;color:#047857;font-weight:650}
.mx-item em{display:block;font-style:normal;font-size:10.5px;color:#9ca3af;letter-spacing:.04em}
@media(max-width:900px){.mx-layout{grid-template-columns:1fr}.mx-panel{grid-column:1;grid-row:auto}.mx-nav{display:none}}