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4px}.kb-item-sum{font-size:13px;color:var(--text-light);line-height:1.6;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.kb-item-tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}.kb-tag{font-size:11px;color:var(--text-light);background:var(--bg);border-radius:4px;padding:1px 7px}.kbd-page{max-width:760px;margin:0 auto}.kbd-back{background:none;border:none;color:var(--primary-light);font-size:14px;cursor:pointer;padding:4px 0;margin-bottom:8px}.kbd-cat{font-size:12px;color:var(--primary-light);background:#eef4ff;border-radius:6px;padding:2px 10px;display:inline-block}.kbd-title{font-size:22px;margin:10px 0 6px;color:var(--text)}.kbd-tags{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:14px}.kbd-tag{font-size:12px;color:var(--text-light);background:var(--card);border:1px solid var(--border);border-radius:999px;padding:2px 10px}.kbd-content{background:var(--card);border:1px solid var(--border);border-radius:10px;padding:18px 20px}.kbd-loading,.kbd-error{padding:40px;text-align:center;color:var(--text-light)}.kbd-error{color:#b91c1c}.detail-answer .kb-link,.kbd-content .kb-link{color:var(--primary-light);text-decoration:none;border-bottom:1px dashed var(--primary-light);cursor:pointer}.detail-answer .kb-link:hover,.kbd-content .kb-link:hover{background:#eef4ff}.mastery-picker{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:14px 0;padding:10px 12px;background:#f8fafc;border:1px solid var(--border);border-radius:10px}.mastery-label{font-size:13px;color:var(--text-light);margin-right:2px}.mastery-opt{border:1px solid var(--border);background:var(--card);color:var(--text);border-radius:999px;font-size:13px;padding:4px 14px;cursor:pointer}.mastery-opt:disabled{opacity:.6;cursor:default}.mastery-1.active{background:#eff6ff;border-color:#bfdbfe;color:#1d4ed8}.mastery-2.active{background:#fff7ed;border-color:#fed7aa;color:#b45309}.mastery-3.active{background:#f0fdf4;border-color:#bbf7d0;color:#15803d}.mastery-clear{border:none;background:none;color:var(--text-light);font-size:12px;text-decoration:underline;cursor:pointer;margin-left:2px}.mastery-tip{font-size:12px;color:var(--text-light)}.mastery-badge{font-size:11px;border-radius:4px;padding:1px 7px;margin-left:8px;font-weight:500;white-space:nowrap}.mastery-badge.mastery-1{color:#1d4ed8;background:#eff6ff}.mastery-badge.mastery-2{color:#b45309;background:#fff7ed}.mastery-badge.mastery-3{color:#15803d;background:#f0fdf4}.kb-toolbar{display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin-bottom:10px}.kb-tree-btn{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--border);background:var(--card);color:var(--text);border-radius:8px;font-size:13px;padding:7px 12px;cursor:pointer}.kb-tree-btn:hover{border-color:var(--primary-light);color:var(--primary-light)}.kb-tree-icon{font-size:13px;opacity:.75}.kb-tree-current{max-width:42vw;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;background:#eef4ff;color:var(--primary-light);border-radius:999px;padding:1px 8px;font-size:12px}.kb-clear{border:none;background:none;color:var(--text-light);font-size:12px;cursor:pointer;text-decoration:underline}.kb-drawer-mask{position:fixed;inset:var(--header-h) 0 0 0;background:#00000059;z-index:34}.kb-drawer{position:fixed;left:0;top:var(--header-h);bottom:0;width:300px;max-width:86vw;background:var(--card);border-right:1px solid var(--border);box-shadow:4px 0 20px #00000026;transform:translate(-100%);transition:transform .22s ease;overflow-y:auto;-webkit-overflow-scrolling:touch;z-index:35}.kb-drawer.open{transform:translate(0)}.kb-drawer-head{position:sticky;top:0;display:flex;align-items:center;justify-content:space-between;padding:12px 14px;font-size:14px;font-weight:700;color:var(--primary);background:var(--card);border-bottom:1px solid var(--border)}.kb-drawer-close{border:none;background:none;color:var(--text-light);font-size:15px;cursor:pointer;padding:2px 6px}.kb-nav{padding:6px 0 30px}.kb-nav-item{display:flex;align-items:center;justify-content:space-between;gap:8px;width:100%;border:none;border-left:3px solid transparent;background:none;text-align:left;font-size:14px;color:var(--text);padding:9px 14px;cursor:pointer}.kb-nav-item:hover{background:var(--bg)}.kb-nav-item.active{color:var(--primary-light);border-left-color:var(--primary-light);background:#eef4ff;font-weight:600}.kb-nav-all{font-weight:600}.kb-nav-group{margin-top:6px;padding-top:4px;border-top:1px solid var(--bg)}.kb-nav-top{font-weight:600}.kb-nav-sub{padding-left:28px;font-size:13px;color:var(--text-light)}.kb-nav-sub.active{color:var(--primary-light)}.kb-nav-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.kb-nav-count{flex-shrink:0;font-size:12px;color:var(--text-light);background:var(--bg);border-radius:10px;padding:1px 8px}.kb-nav-item.active .kb-nav-count{background:#dbe8ff;color:var(--primary-light)}.kb-section-parent{color:var(--text-light);font-weight:500;margin-right:6px}.kb-section-parent:after{content:" /";margin-left:6px}.kb-marked-tip{margin-left:auto;font-size:12px;color:var(--text-light)}.kbd-cat-parent{opacity:.75}.kbd-cat-sep{margin:0 6px;opacity:.6}@media (max-width: 992px){.mastery-picker{margin:10px 0;padding:8px 10px}.mastery-opt{padding:4px 12px}.kb-marked-tip{width:100%;margin-left:0}.kb-drawer{width:280px}}.cat-page{max-width:760px;margin:0 auto}.cat-title{margin:4px 0 2px;font-size:20px;color:var(--primary)}.cat-sub{margin:0 0 16px;color:var(--text-light);font-size:13px}.cat-msg{margin-bottom:12px;padding:9px 13px;border-radius:8px;font-size:13px}.cat-msg.error{background:#fef2f2;color:#b91c1c;border:1px solid #fecaca}.cat-empty{padding:24px;text-align:center;color:var(--text-light);font-size:14px}.cat-group{margin-bottom:20px}.cat-group-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:8px;padding-left:8px;border-left:3px solid var(--primary)}.cat-group-name{font-size:14px;font-weight:700;color:var(--primary)}.cat-group-count{font-size:12px;color:var(--text-light)}.cat-chapters{background:var(--card);border:1px solid var(--border);border-radius:12px;overflow:hidden}.cat-chapter{display:flex;align-items:center;gap:10px;padding:12px 14px;border-top:1px solid var(--bg);color:var(--text);text-decoration:none}.cat-chapter:first-child{border-top:none}.cat-chapter:hover{background:#eef4ff}.cat-chapter-idx{flex-shrink:0;width:22px;height:22px;border-radius:50%;background:var(--bg);color:var(--primary-light);font-size:11px;font-weight:700;display:grid;place-items:center}.cat-chapter-name{flex:1;min-width:0;font-size:14px;line-height:1.5}.cat-chapter-count{flex-shrink:0;font-size:12px;color:var(--text-light)}.cat-chapter-arrow{flex-shrink:0;color:var(--text-light);font-size:16px}@media (max-width: 992px){.cat-title{font-size:18px}.cat-chapter{padding:11px 12px;gap:8px}.cat-chapter-name{font-size:13.5px}}