/* 邮箱页面撑满内容区：绕过 .content 的全局 max-width */
.content-mailbox{max-width:none!important;padding:14px 20px 10px}
.mb-page{display:grid;grid-template-columns:var(--mb-side,210px) 6px var(--mb-list,420px) 6px minmax(320px,1fr);gap:0;height:calc(100vh - 92px);min-height:560px;background:#fff;border:1px solid #e5e7eb;border-radius:12px;overflow:hidden}
.mb-split{cursor:col-resize;background:transparent;transition:background .12s}
.mb-split:hover,.mb-split.is-dragging{background:#c7d7fe}
.mb-sidebar{display:flex;flex-direction:column;gap:12px;padding:16px 14px;border-right:1px solid #eef0f3;background:#f8fafc;min-height:0;overflow:hidden}
.mb-compose-btn{width:100%;padding:10px 0;border:none;border-radius:8px;background:#2563eb;color:#fff;font-size:14px;font-weight:600;cursor:pointer;font-family:inherit}
.mb-compose-btn:hover{background:#1d4ed8}
.mb-compose-btn:disabled{background:#93b4fd;cursor:not-allowed}
.mb-search{width:100%;padding:7px 10px;border:1px solid #e5e7eb;border-radius:8px;font-size:12px;font-family:inherit;box-sizing:border-box;background:#fff}
.mb-search:focus{outline:2px solid #c7d7fe;border-color:#93b4fd}
.mb-folders{display:flex;flex-direction:column;gap:2px;flex:1;overflow:auto}
.mb-group-title{padding:10px 10px 4px;font-size:11px;color:#9ca3af;font-weight:600}
.mb-folder.mb-sub{font-size:12px;color:#4b5563;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.mb-folder.is-active.mb-sub{background:#e0eaff;color:#1d4ed8;font-weight:600}
.mb-toolbar-filter{font-size:11px;color:#1d4ed8;background:#eff6ff;border-radius:6px;padding:2px 8px}
.mb-toolbar-filter a{margin-left:6px;color:#6b7280;text-decoration:none}
.mb-toolbar-filter a:hover{color:#dc2626}
/* 正文区自动撑满右栏到底部，内部滚动（去掉固定高度，避免下方大片空白） */
.mb-html-frame{width:100%;flex:1;min-height:240px;border:1px solid #eef0f3;border-radius:10px;background:#fff;margin:0 0 14px}
.mb-folder{display:flex;align-items:center;justify-content:space-between;padding:8px 10px;border-radius:8px;font-size:13px;color:#374151;text-decoration:none}
.mb-folder:hover{background:#eef2f7}
.mb-folder.is-active{background:#e0eaff;color:#1d4ed8;font-weight:600}
.mb-count{background:#ef4444;color:#fff;border-radius:99px;font-size:10px;padding:1px 7px;font-weight:600}
.mb-count-gray{background:#e5e7eb;color:#6b7280;border-radius:99px;font-size:10px;padding:1px 7px;font-weight:500}
.mb-folder-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.mb-sidebar-foot{border-top:1px solid #eef0f3;padding-top:12px;display:flex;flex-direction:column;gap:8px}
.mb-sidebar-foot .btn{width:100%}
.mb-account{margin:0;font-size:11px;color:#9ca3af;word-break:break-all;text-align:center}
.mb-main{display:flex;flex-direction:column;min-width:0;min-height:0;overflow:hidden;border-right:1px solid #eef0f3}
.mb-toolbar{display:flex;align-items:center;gap:10px;padding:10px 14px;border-bottom:1px solid #eef0f3;flex-wrap:wrap}
.mb-toolbar>b{font-size:14px;color:#111827}
.mb-toolbar-note{font-size:11px;color:#9ca3af}
.mb-toolbar-error{font-size:11px;color:#dc2626}
.mb-toolbar-spacer{flex:1}
.mb-list{flex:1;min-height:0;overflow-y:auto}
.mb-group-head{padding:7px 14px;background:#f9fafb;font-size:11px;color:#6b7280;border-bottom:1px solid #f1f3f6;position:sticky;top:0}
.mb-item{display:flex;gap:10px;padding:10px 14px;border-bottom:1px solid #f5f6f8;cursor:pointer;align-items:flex-start}
.mb-item:hover{background:#fafbfc}
.mb-item.is-active{background:#eff6ff}
.mb-avatar{flex:none;width:34px;height:34px;border-radius:50%;color:#fff;font-size:15px;font-weight:600;display:flex;align-items:center;justify-content:center}
.mb-item-main{min-width:0;flex:1}
.mb-item-top{display:flex;justify-content:space-between;gap:8px}
.mb-from{font-size:13px;color:#374151;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.mb-item.is-unread .mb-from{font-weight:600;color:#111827}
.mb-date{font-size:11px;color:#9ca3af;white-space:nowrap}
.mb-item-line{display:flex;align-items:baseline;gap:6px;min-width:0;margin-top:2px}
.mb-subject{font-size:12px;color:#4b5563;white-space:nowrap;flex:none;max-width:45%;overflow:hidden;text-overflow:ellipsis}
.mb-item.is-unread .mb-subject{color:#111827}
.mb-snippet{font-size:12px;color:#9ca3af;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0;flex:1}
.mb-badge{flex:none;font-size:10px;color:#2563eb;border:1px solid #c7d7fe;border-radius:4px;padding:0 4px}
.mb-list-empty{padding:48px 20px;text-align:center;color:#9ca3af;font-size:13px}
.mb-reading{display:flex;flex-direction:column;overflow:auto;min-height:0;padding:18px 20px;background:#fff}
.mb-empty{padding:48px 20px;text-align:center;color:#9ca3af;font-size:13px}
.mb-detail{display:flex;flex-direction:column;flex:1;min-height:0}
.mb-pane-title{margin:0 0 14px;font-size:16px;color:#111827;line-height:1.45}
.mb-hint{margin:0 0 14px;font-size:12px;color:#6b7280;line-height:1.7}
.mb-hint code{background:#f3f4f6;padding:1px 5px;border-radius:4px;font-size:11px}
.mb-meta{display:grid;grid-template-columns:auto 1fr;gap:4px 12px;margin:0 0 14px;font-size:12px}
.mb-meta dt{color:#9ca3af}
.mb-meta dd{margin:0;color:#374151;word-break:break-all}
.mb-body{white-space:pre-wrap;word-break:break-word;background:#f9fafb;border:1px solid #eef0f3;border-radius:10px;padding:14px;font-size:13px;line-height:1.7;flex:1;min-height:200px;overflow:auto;font-family:inherit;margin:0 0 14px}
.mb-form{display:flex;flex-direction:column;gap:10px}
.mb-form label{display:flex;flex-direction:column;gap:4px;font-size:12px;color:#4b5563}
.mb-form input,.mb-form textarea{width:100%;padding:8px 10px;border:1px solid #e5e7eb;border-radius:8px;font-size:13px;font-family:inherit;box-sizing:border-box;background:#fff}
.mb-form input:focus,.mb-form textarea:focus{outline:2px solid #c7d7fe;border-color:#93b4fd}
.mb-form textarea{resize:vertical}
.mb-actions-row{display:flex;gap:8px;margin-top:4px}
/* 详情页：顶部操作条 + 发件人卡片 + 底部快捷回复条（对齐灵犀详情页） */
.mb-detail{display:flex;flex-direction:column;min-height:100%}
.mb-detail-bar{display:flex;align-items:center;gap:6px;margin:-6px 0 12px;flex-wrap:wrap}
.mb-bar-btn{border:1px solid #e5e7eb;background:#fff;border-radius:7px;padding:5px 12px;font-size:12px;color:#374151;cursor:pointer;font-family:inherit}
.mb-bar-btn:hover{background:#f3f4f6;color:#111827}
.mb-bar-sep{width:1px;height:16px;background:#e5e7eb;margin:0 4px}
.mb-bar-unread{font-size:10px;color:#dc2626;border:1px solid #fecaca;background:#fef2f2;border-radius:4px;padding:1px 6px}
.mb-detail-head{display:flex;align-items:flex-start;gap:12px;padding:12px 14px;background:#f8fafc;border:1px solid #eef0f3;border-radius:10px;margin-bottom:12px}
.mb-head-main{min-width:0;flex:1}
.mb-detail-subject{margin:0 0 4px;font-size:16px;color:#111827;line-height:1.4;word-break:break-word}
.mb-head-sub{font-size:12px;color:#6b7280}
.mb-detail .mb-meta{background:#f8fafc;border:1px solid #eef0f3;border-radius:10px;padding:10px 14px}
.mb-detail .mb-meta dd a{color:#2563eb;text-decoration:none}
.mb-detail .mb-meta dd a:hover{text-decoration:underline}
.mb-quickbar{display:flex;align-items:center;gap:8px;margin-top:auto;padding-top:14px;border-top:1px solid #eef0f3;flex-wrap:wrap}
/* 附件区 */
.mb-attachments{margin:0 0 14px;border:1px solid #eef0f3;border-radius:10px;padding:10px 12px;background:#fafbfc}
.mb-attach-title{font-size:11px;color:#9ca3af;margin-bottom:6px}
.mb-attach{display:inline-flex;align-items:center;gap:6px;margin:0 8px 6px 0;padding:5px 10px;border:1px solid #e5e7eb;border-radius:8px;background:#fff;font-size:12px;color:#1d4ed8;text-decoration:none;max-width:100%}
.mb-attach:hover{background:#eff6ff;border-color:#c7d7fe}
.mb-attach.is-disabled{color:#9ca3af;cursor:not-allowed;background:#f9fafb}
.mb-attach-icon{flex:none;width:16px;height:16px;border-radius:4px;background:#eff6ff;color:#2563eb;font-size:11px;display:inline-flex;align-items:center;justify-content:center}
.mb-attach.is-disabled .mb-attach-icon{background:#f3f4f6;color:#9ca3af}
.mb-attach-name{max-width:240px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.mb-attach-size{color:#9ca3af;font-size:11px}
.mb-quick-label{font-size:11px;color:#9ca3af}
.mb-quick-chip{border:1px solid #e5e7eb;background:#fff;border-radius:99px;padding:5px 14px;font-size:12px;color:#374151;cursor:pointer;font-family:inherit}
.mb-quick-chip:hover{border-color:#93b4fd;color:#1d4ed8;background:#eff6ff}
.mb-quick-main{color:#2563eb;border-color:#c7d7fe;font-weight:600}
.mb-quick-spacer{flex:1}
@media(max-width:1100px){
  .mb-page{grid-template-columns:170px minmax(280px,1fr);grid-template-rows:auto minmax(360px,1fr);height:auto}
  .mb-split{display:none}
  .mb-reading{grid-column:1/-1;border-top:1px solid #eef0f3}
}
@media(max-width:760px){
  .mb-page{grid-template-columns:1fr}
  .mb-split{display:none}
  .mb-sidebar{flex-direction:row;flex-wrap:wrap;align-items:center;border-right:none;border-bottom:1px solid #eef0f3}
  .mb-folders{flex-direction:row;flex:1}
  .mb-compose-btn{width:auto;padding:8px 18px}
  .mb-sidebar-foot{border-top:none;padding-top:0;flex-direction:row}
}