:root{--bg:#f5f5f7;--surface:#fff;--border:#e2e8f0;--text:#1a1a2e;--text-muted:#718096;--primary:#6366f1;--primary-hover:#4f46e5;--success:#10b981;--warning:#f59e0b;--danger:#ef4444;--radius:8px;--shadow:0 1px 3px #00000014}*,:before,:after{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;line-height:1.5}button{cursor:pointer;font:inherit;border:none}input,select,textarea{font:inherit}.app{min-height:100vh;display:flex}.sidebar{background:var(--surface);border-right:1px solid var(--border);flex-direction:column;flex-shrink:0;width:240px;padding:1rem 0;display:flex}.sidebar h1{margin-bottom:1.5rem;padding:0 1rem;font-size:1.25rem}.sidebar nav{flex-direction:column;gap:2px;display:flex}.sidebar a{color:var(--text-muted);align-items:center;gap:.75rem;padding:.625rem 1rem;font-size:.9rem;text-decoration:none;transition:all .15s;display:flex}.sidebar a:hover{background:var(--bg);color:var(--text)}.sidebar a.active{color:var(--primary);background:#eef2ff;font-weight:500}.main{flex:1;min-width:0;max-width:1200px;padding:1.5rem}.page-header{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:.75rem;margin-bottom:1.5rem;display:flex}.page-header h2{font-size:1.5rem}.btn{border-radius:var(--radius);align-items:center;gap:.375rem;padding:.5rem 1rem;font-size:.875rem;font-weight:500;transition:all .15s;display:inline-flex}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover:not(:disabled){background:var(--primary-hover)}.btn-success{background:var(--success);color:#fff}.btn-success:hover:not(:disabled){opacity:.9}.btn-danger{background:var(--danger);color:#fff}.btn-danger:hover:not(:disabled){opacity:.9}.btn-ghost{color:var(--text-muted);background:0 0}.btn-ghost:hover:not(:disabled){background:var(--bg);color:var(--text)}.btn-sm{padding:.25rem .625rem;font-size:.8rem}.form-group{margin-bottom:1rem}.form-group label{margin-bottom:.25rem;font-size:.85rem;font-weight:500;display:block}.form-input{border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);width:100%;padding:.5rem .75rem;font-size:.9rem;transition:border-color .15s}.form-input:focus{border-color:var(--primary);outline:none;box-shadow:0 0 0 3px #6366f11a}textarea.form-input{resize:vertical;min-height:100px}.search-bar{flex-wrap:wrap;gap:.5rem;margin-bottom:1rem;display:flex}.search-bar .form-input{flex:1;min-width:200px}.filter-bar{flex-wrap:wrap;align-items:center;gap:.375rem;margin-bottom:1rem;display:flex}.filter-btn{background:var(--bg);border:1px solid var(--border);color:var(--text-muted);cursor:pointer;border-radius:999px;padding:.25rem .75rem;font-size:.8rem;transition:all .15s}.filter-btn.active{background:var(--primary);color:#fff;border-color:var(--primary)}.filter-btn:hover:not(.active){background:var(--border)}.subject-badge{white-space:nowrap;border-radius:999px;align-items:center;gap:.375rem;padding:.125rem .5rem;font-size:.75rem;display:inline-flex}.subject-dot{border-radius:50%;flex-shrink:0;width:8px;height:8px}.item-list{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}.task-row{border-bottom:1px solid var(--border);cursor:pointer;align-items:center;gap:.75rem;padding:.75rem 1rem;transition:background .1s;display:flex}.task-row:last-child{border-bottom:none}.task-row:hover{background:var(--bg)}.task-row.done .task-title{color:var(--text-muted);text-decoration:line-through}.task-check{width:1.2rem;height:1.2rem;accent-color:var(--success);cursor:pointer;flex-shrink:0}.task-title{text-overflow:ellipsis;white-space:nowrap;flex:1;min-width:0;font-weight:500;overflow:hidden}.task-meta{flex-shrink:0;align-items:center;gap:.5rem;display:flex}.task-time{color:var(--text-muted);white-space:nowrap;font-size:.75rem}.subject-row{border-bottom:1px solid var(--border);align-items:center;gap:.75rem;padding:.75rem 1rem;display:flex}.subject-row:last-child{border-bottom:none}.subject-color-swatch{border-radius:6px;flex-shrink:0;width:24px;height:24px}.subject-info{flex:1;min-width:0}.subject-name{font-weight:500}.subject-counts{color:var(--text-muted);font-size:.8rem}.subject-actions{gap:.25rem;display:flex}.modal-overlay{z-index:50;background:#0006;justify-content:center;align-items:center;padding:1rem;display:flex;position:fixed;inset:0}.modal{background:var(--surface);border-radius:var(--radius);width:100%;max-width:520px;max-height:90vh;padding:1.5rem;overflow-y:auto;box-shadow:0 20px 60px #00000026}.modal h3{margin-bottom:1rem}.modal-actions{justify-content:flex-end;gap:.5rem;margin-top:1.5rem;display:flex}.color-grid{flex-wrap:wrap;gap:.5rem;display:flex}.color-option{cursor:pointer;border:2px solid #0000;border-radius:6px;width:32px;height:32px;transition:transform .1s}.color-option:hover{transform:scale(1.15)}.color-option.selected{border-color:var(--text);box-shadow:0 0 0 2px var(--surface), 0 0 0 4px var(--text)}.activity-item{border-bottom:1px solid var(--border);align-items:flex-start;gap:.75rem;padding:.75rem 1rem;font-size:.9rem;display:flex}.activity-item:last-child{border-bottom:none}.activity-icon{flex-shrink:0;margin-top:2px}.activity-body{flex:1;min-width:0}.activity-action{font-weight:500}.activity-task-title{color:var(--primary);cursor:pointer;text-decoration:none}.activity-task-title:hover{text-decoration:underline}.activity-details{color:var(--text-muted);font-size:.8rem}.activity-time{color:var(--text-muted);white-space:nowrap;flex-shrink:0;margin-top:2px;font-size:.75rem}.pagination{justify-content:center;align-items:center;gap:.5rem;padding:1rem;display:flex}.empty{text-align:center;color:var(--text-muted);padding:3rem 1rem}.status-badge{border-radius:999px;align-items:center;gap:.25rem;padding:.125rem .5rem;font-size:.75rem;font-weight:500;display:inline-flex}.status-badge.pending{color:#92400e;background:#fef3c7}.status-badge.done{color:#065f46;background:#d1fae5}.status-badge.archived{color:#64748b;background:#f1f5f9}.toolbar{border-bottom:1px solid var(--border);background:#eef2ff;flex-wrap:wrap;align-items:center;gap:.5rem;padding:.75rem 1rem;font-size:.85rem;display:flex}.toast{background:var(--text);color:#fff;border-radius:var(--radius);z-index:100;max-width:90vw;padding:.75rem 1.25rem;font-size:.9rem;animation:.2s fadeIn;position:fixed;bottom:1.5rem;right:1.5rem}.toast.error{background:var(--danger)}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.task-detail{max-width:720px}.task-detail-header{align-items:flex-start;gap:1rem;margin-bottom:1.5rem;display:flex}.task-detail-header h2{word-break:break-word;flex:1;font-size:1.5rem}.task-detail-actions{flex-wrap:wrap;gap:.5rem;margin-bottom:1.5rem;display:flex}.task-detail-meta{color:var(--text-muted);flex-wrap:wrap;gap:1rem;margin-bottom:1.5rem;font-size:.9rem;display:flex}.task-detail-description{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:1.25rem}.confirm-overlay{z-index:60;background:#00000080;justify-content:center;align-items:center;padding:1rem;display:flex;position:fixed;inset:0}.confirm-dialog{background:var(--surface);border-radius:var(--radius);width:100%;max-width:400px;padding:1.5rem;box-shadow:0 20px 60px #0003}.confirm-dialog p{margin-bottom:1.25rem}.confirm-dialog .modal-actions{margin-top:0}.bottom-nav{display:none}@media (width<=768px){.sidebar{display:none}.bottom-nav{z-index:40;background:var(--surface);border-top:1px solid var(--border);display:flex;position:fixed;bottom:0;left:0;right:0;box-shadow:0 -2px 8px #0000000f}.bottom-nav a{color:var(--text-muted);flex-direction:column;flex:1;justify-content:center;align-items:center;gap:.25rem;padding:.6rem 0 .5rem;font-size:.7rem;font-weight:500;text-decoration:none;transition:color .15s;display:flex}.bottom-nav a:hover{color:var(--text)}.bottom-nav a.active{color:var(--primary)}.main{padding:1rem 1rem calc(1rem + 64px)}.page-header{flex-direction:column;align-items:flex-start}.task-row{flex-wrap:wrap}.task-meta{justify-content:space-between;width:100%}}.markdown-preview{word-break:break-word;line-height:1.6}.markdown-preview h1,.markdown-preview h2,.markdown-preview h3,.markdown-preview h4{margin-top:1em;margin-bottom:.5em}.markdown-preview h1:first-child,.markdown-preview h2:first-child,.markdown-preview h3:first-child{margin-top:0}.markdown-preview p{margin-bottom:.75em}.markdown-preview p:last-child{margin-bottom:0}.markdown-preview ul,.markdown-preview ol{margin-bottom:.75em;padding-left:1.5em}.markdown-preview code{background:var(--bg);border-radius:4px;padding:.15em .35em;font-size:.85em}.markdown-preview pre{background:var(--bg);border-radius:var(--radius);margin-bottom:.75em;padding:1rem;overflow-x:auto}.markdown-preview pre code{background:0 0;padding:0}.markdown-preview img{border-radius:var(--radius);max-width:100%;height:auto;margin:.5em 0}.markdown-preview blockquote{border-left:3px solid var(--border);color:var(--text-muted);margin:.75em 0;padding-left:1em}.markdown-preview a{color:var(--primary)}.markdown-preview a:hover{text-decoration:underline}.media-manager{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);margin-top:1.5rem;padding:1rem}.media-header{justify-content:space-between;align-items:center;margin-bottom:.75rem;display:flex}.media-header h3{font-size:1rem}.upload-btn{cursor:pointer}.media-empty{color:var(--text-muted);text-align:center;padding:.5rem;font-size:.85rem}.media-grid{grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:.75rem;display:grid}.media-item{border:1px solid var(--border);border-radius:var(--radius);background:var(--bg);overflow:hidden}.media-thumbnail{object-fit:cover;width:100%;height:140px;display:block}.media-file-link{color:var(--text);align-items:center;gap:.5rem;min-height:140px;padding:1rem;text-decoration:none;display:flex}.media-file-link:hover{background:var(--border)}.media-file-name{word-break:break-all;flex:1;font-size:.85rem}.media-info{color:var(--text-muted);border-top:1px solid var(--border);background:var(--surface);justify-content:space-between;align-items:center;padding:.375rem .5rem;font-size:.75rem;display:flex}.media-confirm{gap:.25rem;display:flex}.media-delete{padding:.125rem .25rem}.recurrence-toggle{cursor:pointer;align-items:center;gap:.375rem;font-size:.85rem;font-weight:500;display:inline-flex}.recurrence-toggle input[type=checkbox]{accent-color:var(--primary)}.recurrence-fields{background:var(--bg);border-radius:var(--radius);flex-direction:column;gap:.75rem;margin-top:.75rem;padding:.75rem;display:flex}.recurrence-row{align-items:center;gap:.5rem;display:flex}.recurrence-row label{align-items:center;gap:.5rem;margin-bottom:0;font-size:.85rem;font-weight:400;display:flex}.recurrence-interval{text-align:center;width:64px}.recurrence-frequency{width:auto;min-width:100px}.recurrence-indicator{color:var(--text-muted);flex-shrink:0;align-items:center;display:inline-flex}.recurrence-info{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:1rem;padding:1rem 1.25rem}.recurrence-info h4{align-items:center;gap:.375rem;margin-bottom:.75rem;font-size:.9rem;display:flex}.recurrence-info-grid{grid-template-columns:auto 1fr;gap:.25rem 1rem;font-size:.85rem;display:grid}.recurrence-info-label{color:var(--text-muted);font-weight:500}.recurrence-parent-link{color:var(--primary);text-decoration:none}.recurrence-parent-link:hover{text-decoration:underline}@keyframes spin{to{transform:rotate(360deg)}}.spin{animation:1s linear infinite spin}@media (width<=480px){.search-bar{flex-direction:column}.search-bar .form-input{min-width:0}.filter-bar{gap:.25rem}.modal{padding:1rem}.toast{bottom:calc(1.5rem + 64px)}}.share-banner{background:var(--color-warning-bg,#fff7e6);color:var(--color-warning,#8a5a00);border-bottom:1px solid var(--color-warning,#d29644);justify-content:space-between;align-items:center;gap:.5rem;margin:-1rem -1rem 1rem;padding:.5rem 1rem;font-size:.9rem;display:flex}.error{color:var(--color-danger,#c0392b);font-size:.9rem}