:root{--bg: #0f1419;--bg-elevated: #1a222d;--border: #2d3a4a;--text: #e8edf4;--text-muted: #8b9cb3;--accent: #3d9cf5;--accent-hover: #5aadff;--accent-muted: rgba(61, 156, 245, .15);--danger: #f07178;--radius: 12px;--font: "DM Sans", system-ui, sans-serif;--mono: "JetBrains Mono", ui-monospace, monospace}*,*:before,*:after{box-sizing:border-box}body{margin:0;min-height:100vh;font-family:var(--font);font-size:16px;line-height:1.5;color:var(--text);background:radial-gradient(ellipse 80% 50% at 50% -20%,rgba(61,156,245,.25),transparent),var(--bg);-webkit-font-smoothing:antialiased}#root{min-height:100vh;display:flex;justify-content:center;padding:2.5rem 1.25rem 4rem}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.app{width:100%;max-width:520px}.header{text-align:center;margin-bottom:1.75rem}.eyebrow{margin:0 0 .5rem;font-family:var(--mono);font-size:.75rem;font-weight:500;letter-spacing:.08em;text-transform:uppercase;color:var(--accent)}.header h1{margin:0;font-size:2.25rem;font-weight:700;letter-spacing:-.03em}.subtitle{margin:.75rem 0 0;font-size:.95rem;color:var(--text-muted)}.card{background:var(--bg-elevated);border:1px solid var(--border);border-radius:calc(var(--radius) + 4px);padding:1.25rem;box-shadow:0 24px 48px #00000059}.todo-form{display:grid;grid-template-columns:1fr auto;gap:.65rem;margin-bottom:1.25rem}.todo-input,.edit-input{width:100%;padding:.75rem 1rem;font:inherit;color:var(--text);background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);outline:none;transition:border-color .15s,box-shadow .15s}.todo-input:focus,.edit-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-muted)}.btn-primary{padding:.75rem 1.25rem;font:inherit;font-weight:600;color:#0a0e12;background:var(--accent);border:none;border-radius:var(--radius);cursor:pointer;transition:background .15s,opacity .15s}.btn-primary:hover:not(:disabled){background:var(--accent-hover)}.btn-primary:disabled{opacity:.45;cursor:not-allowed}.form-error{grid-column:1 / -1;margin:0;font-size:.875rem;color:var(--danger)}.status{margin:0;padding:1rem;text-align:center;color:var(--text-muted)}.status.error{color:var(--danger)}.todo-list{list-style:none;margin:0;padding:0}.todo-list .empty{padding:2rem 1rem;text-align:center;color:var(--text-muted);font-size:.95rem}.todo-item{display:flex;align-items:center;gap:.75rem;padding:.65rem .5rem;border-bottom:1px solid var(--border)}.todo-item:last-child{border-bottom:none}.todo-item.completed .todo-text{color:var(--text-muted);text-decoration:line-through}.checkbox-wrap{position:relative;display:flex;flex-shrink:0;cursor:pointer}.checkbox-wrap input{position:absolute;opacity:0;width:0;height:0}.checkmark{width:22px;height:22px;border:2px solid var(--border);border-radius:6px;transition:background .15s,border-color .15s}.checkbox-wrap input:checked+.checkmark{background:var(--accent);border-color:var(--accent)}.checkbox-wrap input:checked+.checkmark:after{content:"";display:block;width:5px;height:10px;margin:2px auto;border:solid #0a0e12;border-width:0 2px 2px 0;transform:rotate(45deg)}.todo-text{flex:1;min-width:0;padding:.25rem 0;font:inherit;text-align:left;color:inherit;background:none;border:none;cursor:pointer}.edit-input{flex:1;min-width:0}.btn-icon{flex-shrink:0;width:32px;height:32px;padding:0;font-size:1.35rem;line-height:1;color:var(--text-muted);background:transparent;border:none;border-radius:8px;cursor:pointer;opacity:0;transition:opacity .15s,color .15s,background .15s}.todo-item:hover .btn-icon,.todo-item:focus-within .btn-icon{opacity:1}.btn-icon.delete:hover{color:var(--danger);background:#f071781f}.footer{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.75rem;margin-top:1rem;padding-top:1rem;border-top:1px solid var(--border);font-size:.875rem;color:var(--text-muted)}.count strong{color:var(--text);font-weight:600}.filters{display:flex;gap:.25rem;padding:3px;background:var(--bg);border-radius:999px}.filter-btn{padding:.35rem .85rem;font:inherit;font-size:.8125rem;font-weight:500;color:var(--text-muted);background:transparent;border:none;border-radius:999px;cursor:pointer;transition:color .15s,background .15s}.filter-btn:hover{color:var(--text)}.filter-btn.active{color:var(--text);background:var(--bg-elevated);box-shadow:0 1px 3px #0003}.link-button{padding:0;font:inherit;font-size:inherit;color:var(--accent);background:none;border:none;cursor:pointer;text-decoration:underline;text-underline-offset:2px}.link-button:hover:not(:disabled){color:var(--accent-hover)}.link-button:disabled{opacity:.5;cursor:not-allowed}