*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}:root,[data-theme=light]{--bg: #f4f5f7;--bg-card: #ffffff;--bg-elevated: #f0f1f4;--bg-hover: #e8e9ed;--border: #d8dae0;--text: #1a1d27;--text-secondary: #5f6368;--text-muted: #9295a5;--primary: #6366f1;--primary-hover: #5558e6;--primary-light: rgba(99, 102, 241, .1);--danger: #ef4444;--danger-hover: #dc2626;--success: #10b981;--warning: #f59e0b;--radius: 8px;--radius-lg: 12px;--shadow: 0 4px 24px rgba(0, 0, 0, .08);--shadow-sm: 0 2px 8px rgba(0, 0, 0, .06);--transition: .15s ease}[data-theme=dark]{--bg: #0f1117;--bg-card: #1a1d27;--bg-elevated: #222533;--bg-hover: #2a2d3a;--border: #2e3144;--text: #e4e5eb;--text-secondary: #9295a5;--text-muted: #6b6e80;--primary: #6366f1;--primary-hover: #5558e6;--primary-light: rgba(99, 102, 241, .12);--danger: #ef4444;--danger-hover: #dc2626;--success: #10b981;--warning: #f59e0b;--shadow: 0 4px 24px rgba(0, 0, 0, .3);--shadow-sm: 0 2px 8px rgba(0, 0, 0, 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var(--transition)}.assignee-select-trigger:hover{border-color:var(--primary)}.assignee-placeholder{color:var(--text-muted);font-size:14px}.assignee-arrow{font-size:10px;color:var(--text-muted);flex-shrink:0}.assignee-selected-tags{display:flex;flex-wrap:wrap;gap:4px;flex:1}.assignee-tag{display:inline-flex;align-items:center;gap:4px;padding:2px 6px 2px 2px;background:var(--primary-light);border:1px solid var(--primary);border-radius:14px;font-size:12px;color:var(--text)}.assignee-tag-avatar{width:18px;height:18px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:600;font-size:9px;flex-shrink:0}.assignee-tag-remove{background:none;border:none;color:var(--text-muted);font-size:14px;cursor:pointer;padding:0 2px;line-height:1}.assignee-tag-remove:hover{color:var(--danger)}.assignee-dropdown{position:absolute;top:calc(100% + 4px);left:0;right:0;background:var(--bg-card);border:1px solid 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var(--border);margin-top:16px;padding-top:16px}.comments-title{font-size:14px;font-weight:600;margin-bottom:12px}.comments-list{max-height:260px;overflow-y:auto;margin-bottom:12px;display:flex;flex-direction:column;gap:12px}.comments-empty{font-size:13px;color:var(--text-muted);text-align:center;padding:12px 0}.comment{display:flex;gap:10px}.comment-avatar{width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:600;font-size:12px;flex-shrink:0}.comment-body{flex:1;min-width:0}.comment-header{display:flex;align-items:center;gap:8px;margin-bottom:2px;flex-wrap:wrap}.comment-author{font-size:13px;font-weight:600}.comment-date{font-size:11px;color:var(--text-muted)}.comment-actions{display:flex;gap:4px;margin-left:auto;opacity:0;transition:opacity var(--transition)}.comment:hover .comment-actions{opacity:1}.comment-action-btn{background:none;border:none;font-size:11px;color:var(--text-muted);cursor:pointer;padding:0 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textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-light)}.comment-form-footer{display:flex;align-items:center;justify-content:space-between;margin-top:8px}.mention-textarea-wrapper{position:relative;flex:1}.mention-textarea-wrapper textarea{width:100%;background:transparent!important;position:relative;z-index:2}.mention-backdrop{position:absolute;top:0;right:0;bottom:0;left:0;z-index:1;pointer-events:none;overflow:hidden;white-space:pre-wrap;word-wrap:break-word;word-break:break-word;color:transparent;font-family:inherit;font-size:14px;line-height:1.6;padding:8px 10px;border:1px solid transparent;border-radius:var(--radius)}.mention-backdrop mark{color:transparent;background:#3b82f633;border-radius:3px;padding:1px 0}[data-theme=dark] .mention-backdrop mark{background:#60a5fa40}.mention-dropdown{position:fixed;z-index:200;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);max-height:160px;overflow-y:auto;min-width:180px;animation:modal-in .1s ease}.mention-dropdown-item{display:flex;align-items:center;gap:8px;padding:8px 12px;cursor:pointer;font-size:13px;transition:background var(--transition)}.mention-dropdown-item:hover,.mention-dropdown-item.active{background:var(--bg-hover)}.mention-avatar{width:22px;height:22px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:600;font-size:10px;flex-shrink:0}.mention-avatar-img{width:22px;height:22px;border-radius:50%;object-fit:cover}.comment-text .mention-tag,.mention-tag{background:#3b82f626;color:#2563eb!important;padding:2px 5px;border-radius:4px;font-weight:600;font-size:12px}[data-theme=dark] .comment-text .mention-tag,[data-theme=dark] 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