*{margin:0;padding:0;box-sizing:border-box}:root{--bg: #f1f5f9;--card: #ffffff;--text: #1e293b;--muted: #64748b;--faint: #94a3b8;--border: #e2e8f0;--primary: #2563eb;--primary-hover: #1d4ed8;--high: #ef4444;--mid: #f59e0b;--low: #10b981}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);min-height:100vh}.page{min-height:100vh;display:flex;justify-content:center;padding:40px 16px}.card{width:100%;max-width:720px;align-self:flex-start;background:var(--card);border-radius:16px;box-shadow:0 10px 30px #1e293b14;padding:32px}.header{margin-bottom:24px}.header h1{font-size:26px;font-weight:700}.subtitle{color:var(--muted);font-size:14px;margin-top:6px}.add-row{display:flex;gap:10px;margin-bottom:20px}.input{flex:1;min-width:0;padding:10px 14px;border:1px solid var(--border);border-radius:10px;font-size:15px;outline:none;transition:border-color .2s,box-shadow .2s}.input:focus{border-color:var(--primary);box-shadow:0 0 0 3px #2563eb26}.select{padding:10px 12px;border:1px solid var(--border);border-radius:10px;font-size:14px;background:#fff;outline:none;cursor:pointer}.btn-primary{padding:10px 22px;border:none;border-radius:10px;background:var(--primary);color:#fff;font-size:15px;font-weight:600;cursor:pointer;transition:background .2s;white-space:nowrap}.btn-primary:hover{background:var(--primary-hover)}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.filter-row{display:flex;align-items:center;gap:8px;margin-bottom:18px;flex-wrap:wrap}.filter-btn{padding:6px 16px;border:1px solid var(--border);border-radius:999px;background:#fff;font-size:14px;color:var(--muted);cursor:pointer;transition:all .2s}.filter-btn:hover{border-color:var(--primary);color:var(--primary)}.filter-btn.active{background:var(--primary);border-color:var(--primary);color:#fff}.count{margin-left:auto;font-size:13px;color:var(--muted)}.error-msg{background:#fef2f2;color:#b91c1c;border:1px solid #fecaca;border-radius:10px;padding:10px 14px;font-size:14px;margin-bottom:14px}.empty{text-align:center;color:var(--muted);padding:40px 0;font-size:15px}.task-list{list-style:none;display:flex;flex-direction:column;gap:10px}.task-item{display:flex;align-items:center;gap:12px;border:1px solid var(--border);border-radius:12px;padding:14px 16px;background:#fff;transition:box-shadow .2s}.task-item:hover{box-shadow:0 4px 14px #1e293b0f}.task-item.completed{background:#f8fafc}.task-item.completed .task-title{text-decoration:line-through;color:var(--faint)}.priority-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0}.priority-dot.high{background:var(--high)}.priority-dot.mid{background:var(--mid)}.priority-dot.low{background:var(--low)}.task-main{flex:1;min-width:0}.task-title{font-size:15px;word-break:break-all}.task-meta{display:flex;align-items:center;gap:10px;margin-top:6px;flex-wrap:wrap}.tag{font-size:12px;padding:2px 10px;border-radius:999px;font-weight:600}.tag.high{background:#fee2e2;color:#b91c1c}.tag.mid{background:#fef3c7;color:#b45309}.tag.low{background:#d1fae5;color:#047857}.status{font-size:12px;color:var(--muted)}.time{font-size:12px;color:var(--faint)}.task-actions{display:flex;gap:8px;flex-shrink:0}.btn-toggle{padding:6px 12px;border:1px solid #93c5fd;border-radius:8px;background:#eff6ff;color:#1d4ed8;font-size:13px;cursor:pointer;transition:background .2s}.btn-toggle:hover{background:#dbeafe}.btn-delete{padding:6px 12px;border:1px solid #fecaca;border-radius:8px;background:#fef2f2;color:#dc2626;font-size:13px;cursor:pointer;transition:background .2s}.btn-delete:hover{background:#fee2e2}.footer{margin-top:20px;text-align:right;font-size:13px;color:var(--muted)}@media (max-width: 640px){.page{padding:20px 12px}.card{padding:20px 16px}.add-row{flex-wrap:wrap}.input{flex:1 1 100%}.task-actions{flex-direction:column;gap:6px}}