*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #f0f2f5;--card-bg: #ffffff;--primary: #6366f1;--primary-hover: #4f46e5;--danger: #ef4444;--danger-hover: #dc2626;--text: #1e293b;--text-muted: #94a3b8;--text-done: #cbd5e1;--border: #e2e8f0;--shadow: 0 4px 6px -1px rgb(0 0 0 / .07), 0 2px 4px -2px rgb(0 0 0 / .05);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .08), 0 4px 6px -4px rgb(0 0 0 / .05);--radius: 12px;--radius-sm: 8px}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;line-height:1.5;-webkit-font-smoothing:antialiased}.app{min-height:100vh;display:flex;align-items:flex-start;justify-content:center;padding:60px 16px 40px;background:linear-gradient(135deg,#667eea15,#764ba215)}.container{width:100%;max-width:560px}.header{text-align:center;margin-bottom:28px}.header h1{font-size:clamp(2.5rem,8vw,3.5rem);font-weight:800;letter-spacing:-.04em;background:linear-gradient(135deg,#6366f1,#8b5cf6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.card{background:var(--card-bg);border-radius:var(--radius);box-shadow:var(--shadow-lg);overflow:hidden;border:1px solid var(--border)}.input-row{display:flex;align-items:center;padding:0 16px;border-bottom:1px solid var(--border);gap:8px}.toggle-all{background:none;border:none;cursor:pointer;font-size:22px;color:var(--text-muted);padding:4px 6px;border-radius:var(--radius-sm);transition:color .15s,background .15s;line-height:1;flex-shrink:0}.toggle-all:hover{color:var(--primary);background:#6366f110}.toggle-all.active{color:var(--primary)}.todo-input{flex:1;border:none;outline:none;font-size:1rem;color:var(--text);background:transparent;padding:18px 8px;font-family:inherit}.todo-input::placeholder{color:var(--text-muted)}.todo-list{list-style:none}.todo-item{display:flex;align-items:center;gap:12px;padding:14px 16px;border-bottom:1px solid var(--border);transition:background .15s;position:relative}.todo-item:last-child{border-bottom:none}.todo-item:hover{background:#f8fafc}.todo-item:hover .delete-btn{opacity:1}.todo-check{position:absolute;opacity:0;width:0;height:0}.check-label{width:22px;height:22px;border:2px solid var(--border);border-radius:50%;cursor:pointer;flex-shrink:0;transition:border-color .2s,background .2s;position:relative;display:flex;align-items:center;justify-content:center}.todo-check:checked+.check-label{border-color:var(--primary);background:var(--primary)}.todo-check:checked+.check-label:after{content:"";width:6px;height:10px;border:2px solid white;border-top:none;border-left:none;transform:rotate(45deg) translateY(-1px);display:block}.check-label:hover{border-color:var(--primary)}.todo-text{flex:1;font-size:.975rem;cursor:default;word-break:break-word;transition:color .2s,text-decoration .2s}.todo-item.completed .todo-text{color:var(--text-done);text-decoration:line-through}.edit-input{flex:1;border:2px solid var(--primary);border-radius:var(--radius-sm);padding:4px 10px;font-size:.975rem;font-family:inherit;outline:none;color:var(--text);background:#fff;box-shadow:0 0 0 3px #6366f120}.delete-btn{background:none;border:none;cursor:pointer;font-size:1.3rem;color:var(--text-muted);line-height:1;padding:2px 6px;border-radius:var(--radius-sm);opacity:0;transition:opacity .15s,color .15s,background .15s;flex-shrink:0}.delete-btn:hover{color:var(--danger);background:#ef444415}.empty-state{padding:48px 24px;text-align:center;color:var(--text-muted);font-size:.9rem}.footer{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;font-size:.8rem;color:var(--text-muted);border-top:1px solid var(--border);gap:8px;flex-wrap:wrap}.count{min-width:80px}.filters{display:flex;gap:4px}.filter-btn{background:none;border:1px solid transparent;border-radius:var(--radius-sm);padding:4px 10px;cursor:pointer;font-size:.8rem;color:var(--text-muted);font-family:inherit;transition:all .15s}.filter-btn:hover{border-color:var(--border);color:var(--text)}.filter-btn.active{border-color:var(--primary);color:var(--primary);font-weight:600}.clear-btn{background:none;border:none;cursor:pointer;font-size:.8rem;color:var(--text-muted);font-family:inherit;padding:4px 8px;border-radius:var(--radius-sm);transition:color .15s,background .15s}.clear-btn:hover{color:var(--danger);background:#ef444410}@media (max-width: 480px){.app{padding:32px 12px 24px}.footer{flex-direction:column;align-items:center;gap:10px;text-align:center}.count{min-width:unset}.delete-btn{opacity:1}}