:root{--primary: #2563eb;--primary-hover: #1d4ed8;--primary-light: #eff6ff;--bg-page: #f8fafc;--bg-card: #ffffff;--text-main: #0f172a;--text-muted: #64748b;--border: #e2e8f0;--border-focus: #3b82f6;--danger: #ef4444;--danger-light: #fef2f2;--success: #10b981;--success-light: #ecfdf5;--warning: #f59e0b;--warning-light: #fffbeb;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 14px;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .08), 0 2px 4px -2px rgba(0, 0, 0, .05);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -4px rgba(0, 0, 0, .08)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background-color:var(--bg-page);color:var(--text-main);line-height:1.5;-webkit-font-smoothing:antialiased}button,input,select,textarea{font:inherit}button{cursor:pointer}.todo-app{min-height:100vh;display:flex;flex-direction:column}.app-header{background:var(--bg-card);border-bottom:1px solid var(--border);padding:.75rem 1.25rem;position:sticky;top:0;z-index:20}.header-container{max-width:1024px;margin:0 auto;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:.6rem;font-weight:700;font-size:1.15rem;color:var(--primary)}.brand-icon{width:28px;height:28px}.user-toolbar{display:flex;align-items:center;gap:.75rem}.user-email{font-size:.85rem;color:var(--text-muted);max-width:180px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.btn-secondary{background:#fff;border:1px solid var(--border);color:var(--text-main);padding:.4rem .85rem;border-radius:var(--radius-sm);font-size:.875rem;transition:all .15s}.btn-secondary:hover{background:#f1f5f9;border-color:#cbd5e1}.btn-primary{background:var(--primary);border:1px solid var(--primary);color:#fff;padding:.45rem .95rem;border-radius:var(--radius-sm);font-size:.875rem;font-weight:500;transition:background .15s}.btn-primary:hover{background:var(--primary-hover)}.btn-danger{background:#fff;border:1px solid #fca5a5;color:var(--danger);padding:.4rem .85rem;border-radius:var(--radius-sm);font-size:.875rem}.btn-danger:hover{background:var(--danger-light)}.app-main{max-width:1024px;width:100%;margin:0 auto;padding:1.25rem 1rem;flex:1;display:flex;flex-direction:column;gap:1.25rem}.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem}.stat-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);padding:1rem;display:flex;flex-direction:column;box-shadow:var(--shadow-sm)}.stat-label{font-size:.8rem;color:var(--text-muted);margin-bottom:.25rem}.stat-value{font-size:1.6rem;font-weight:700;line-height:1.2}.stat-card.total .stat-value{color:var(--primary)}.stat-card.active .stat-value{color:var(--warning)}.stat-card.completed .stat-value{color:var(--success)}.stat-card.overdue .stat-value{color:var(--danger)}.control-panel{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);padding:1rem;display:flex;flex-direction:column;gap:.85rem;box-shadow:var(--shadow-sm)}.action-row{display:flex;align-items:center;justify-content:space-between;gap:.75rem;flex-wrap:wrap}.search-box{flex:1;min-width:220px;position:relative}.search-input{width:100%;padding:.45rem .75rem .45rem 2.2rem;border:1px solid var(--border);border-radius:var(--radius-sm);font-size:.875rem;background:var(--bg-page)}.search-input:focus{outline:none;border-color:var(--border-focus);background:#fff}.search-icon{position:absolute;left:.7rem;top:50%;transform:translateY(-50%);color:var(--text-muted)}.filter-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:.65rem;background:#f8fafc;padding:.75rem;border-radius:var(--radius-sm);border:1px solid #edf2f7}.filter-item{display:flex;flex-direction:column;gap:.25rem}.filter-label{font-size:.75rem;color:var(--text-muted);font-weight:500}.filter-select{padding:.35rem .5rem;border:1px solid var(--border);border-radius:var(--radius-sm);background:#fff;font-size:.85rem}.category-manager-toggle{display:flex;align-items:center;gap:.5rem;font-size:.85rem;color:var(--primary);background:none;border:none;padding:0;font-weight:500}.category-drawer{background:#f8fafc;border:1px dashed var(--border);border-radius:var(--radius-sm);padding:.85rem;display:flex;flex-direction:column;gap:.75rem}.category-tags{display:flex;flex-wrap:wrap;gap:.5rem}.category-tag{display:inline-flex;align-items:center;gap:.35rem;padding:.25rem .55rem;border-radius:9999px;background:#fff;border:1px solid var(--border);font-size:.8rem}.category-tag-del{border:none;background:transparent;color:#94a3b8;font-size:1rem;line-height:1;padding:0;display:flex;align-items:center}.category-tag-del:hover{color:var(--danger)}.new-cat-inline{display:flex;gap:.5rem;align-items:center}.cat-input{padding:.35rem .65rem;border:1px solid var(--border);border-radius:var(--radius-sm);font-size:.825rem;background:#fff}.todo-list-container{display:flex;flex-direction:column;gap:.75rem}.todo-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);padding:.95rem 1.15rem;display:flex;align-items:flex-start;gap:.9rem;transition:box-shadow .15s,border-color .15s;box-shadow:var(--shadow-sm)}.todo-card:hover{box-shadow:var(--shadow-md);border-color:#cbd5e1}.todo-card.is-completed{opacity:.7;background:#fafafa}.todo-card.is-overdue{border-left:4px solid var(--danger)}.todo-checkbox{margin-top:.25rem;width:1.25rem;height:1.25rem;cursor:pointer;accent-color:var(--primary)}.todo-body{flex:1;min-width:0}.todo-header-row{display:flex;align-items:baseline;justify-content:space-between;gap:.5rem;flex-wrap:wrap}.todo-title{font-size:1rem;font-weight:600;color:var(--text-main);word-break:break-word}.todo-title.crossed{text-decoration:line-through;color:var(--text-muted)}.todo-badges{display:flex;align-items:center;gap:.4rem;flex-wrap:wrap}.badge{font-size:.725rem;padding:.15rem .5rem;border-radius:9999px;font-weight:500;display:inline-flex;align-items:center}.badge-cat{background:#f1f5f9;color:#475569}.badge-priority-高{background:#fee2e2;color:#b91c1c}.badge-priority-中{background:#fef3c7;color:#b45309}.badge-priority-低{background:#e0f2fe;color:#0369a1}.badge-due{background:#f3f4f6;color:#4b5563}.badge-due.overdue{background:#fee2e2;color:#dc2626;font-weight:600}.todo-notes{margin-top:.35rem;font-size:.85rem;color:#475569;white-space:pre-line;word-break:break-word}.todo-file-row{margin-top:.5rem;display:flex;align-items:center;gap:.5rem}.memo-file-btn{display:inline-flex;align-items:center;gap:.3rem;font-size:.8rem;background:#f0fdf4;border:1px solid #bbf7d0;color:#166534;padding:.25rem .6rem;border-radius:var(--radius-sm)}.memo-file-btn:hover{background:#dcfce7}.todo-actions{display:flex;align-items:center;gap:.4rem}.icon-btn{background:transparent;border:none;color:var(--text-muted);padding:.35rem;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;font-size:.8rem}.icon-btn:hover{background:#f1f5f9;color:var(--text-main)}.icon-btn.delete:hover{background:var(--danger-light);color:var(--danger)}.pagination{display:flex;align-items:center;justify-content:space-between;margin-top:.5rem;padding:.5rem 0}.page-info{font-size:.85rem;color:var(--text-muted)}.page-controls{display:flex;align-items:center;gap:.5rem}.modal-overlay{position:fixed;inset:0;background:#0f172a73;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);display:flex;align-items:center;justify-content:center;z-index:50;padding:1rem}.modal-dialog{background:#fff;border-radius:var(--radius-lg);max-width:520px;width:100%;max-height:90vh;overflow-y:auto;box-shadow:var(--shadow-lg);display:flex;flex-direction:column}.modal-header{padding:1.15rem 1.25rem;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}.modal-title{font-size:1.15rem;font-weight:600}.modal-close-btn{background:transparent;border:none;font-size:1.25rem;line-height:1;color:var(--text-muted)}.modal-content{padding:1.25rem;display:flex;flex-direction:column;gap:1rem}.form-group{display:flex;flex-direction:column;gap:.35rem}.form-group label{font-size:.85rem;font-weight:500;color:var(--text-main)}.form-input,.form-textarea,.form-select{border:1px solid var(--border);border-radius:var(--radius-sm);padding:.5rem .75rem;font-size:.9rem;background:#fff}.form-input:focus,.form-textarea:focus,.form-select:focus{outline:none;border-color:var(--border-focus)}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:.85rem}.btn-link-action{background:none;border:none;padding:0;font-size:.8rem;color:var(--primary);cursor:pointer;font-weight:500;text-decoration:underline}.btn-link-action:hover{color:var(--primary-hover)}.modal-inline-add-cat{display:flex;gap:.35rem;align-items:center}.modal-new-cat-input{flex:1;padding:.45rem .65rem}.btn-sm{padding:.35rem .65rem;font-size:.8rem;white-space:nowrap}.memo-file-section{border:1px dashed var(--border);border-radius:var(--radius-sm);padding:.85rem;background:#f8fafc;display:flex;flex-direction:column;gap:.5rem}.memo-helper{font-size:.75rem;color:var(--text-muted)}.modal-footer{padding:1rem 1.25rem;border-top:1px solid var(--border);display:flex;justify-content:flex-end;gap:.75rem;background:#f8fafc;border-radius:0 0 var(--radius-lg) var(--radius-lg)}.auth-wrapper{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:1.5rem;background:linear-gradient(135deg,#eff6ff,#f8fafc)}.auth-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius-lg);padding:2.2rem 2rem;width:100%;max-width:400px;box-shadow:var(--shadow-md);display:flex;flex-direction:column;gap:1.25rem}.auth-header{text-align:center;display:flex;flex-direction:column;align-items:center;gap:.5rem}.auth-title{font-size:1.4rem;font-weight:700;color:var(--text-main)}.auth-subtitle{font-size:.875rem;color:var(--text-muted)}.auth-tabs{display:flex;border-bottom:1px solid var(--border)}.auth-tab{flex:1;padding:.6rem;background:transparent;border:none;font-weight:500;font-size:.9rem;color:var(--text-muted);border-bottom:2px solid transparent}.auth-tab.active{color:var(--primary);border-bottom-color:var(--primary)}.alert-error{background:#fef2f2;border:1px solid #fecaca;color:#dc2626;padding:.65rem .85rem;border-radius:var(--radius-sm);font-size:.85rem}.alert-success{background:#ecfdf5;border:1px solid #a7f3d0;color:#059669;padding:.65rem .85rem;border-radius:var(--radius-sm);font-size:.85rem}.empty-state{text-align:center;padding:3rem 1rem;background:#fff;border:1px dashed var(--border);border-radius:var(--radius-md);color:var(--text-muted)}@media(max-width:640px){.stats-grid{grid-template-columns:repeat(2,1fr)}.form-row{grid-template-columns:1fr}.action-row{flex-direction:column;align-items:stretch}}