:root{--bg: #f4f5f7;--card: #ffffff;--text: #1f2933;--muted: #7b8794;--border: #e4e7eb;--primary: #4f46e5;--primary-hover: #4338ca;--danger: #ef4444;color-scheme:light dark}@media(prefers-color-scheme:dark){:root{--bg: #16181d;--card: #1f2229;--text: #e6e8eb;--muted: #9aa5b1;--border: #2c303a;--primary: #818cf8;--primary-hover: #6366f1}}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;display:flex;justify-content:center;padding:3rem 1rem}.app{width:100%;max-width:520px;background:var(--card);border:1px solid var(--border);border-radius:16px;padding:2rem;box-shadow:0 10px 30px #0000000f}.title{margin:0 0 1.5rem;font-size:2rem;font-weight:700;text-align:center}.add-form{display:flex;gap:.5rem;margin-bottom:1.25rem}.add-input{flex:1;padding:.75rem 1rem;font-size:1rem;border:1px solid var(--border);border-radius:10px;background:transparent;color:var(--text);outline:none}.add-input:focus{border-color:var(--primary)}.add-btn{padding:.75rem 1.25rem;font-size:1rem;font-weight:600;color:#fff;background:var(--primary);border:none;border-radius:10px;cursor:pointer;transition:background .15s}.add-btn:hover{background:var(--primary-hover)}.filters{display:flex;gap:.5rem;margin-bottom:1rem}.filter-btn{flex:1;padding:.5rem;font-size:.875rem;background:transparent;color:var(--muted);border:1px solid var(--border);border-radius:8px;cursor:pointer}.filter-btn.active{color:#fff;background:var(--primary);border-color:var(--primary)}.list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.5rem}.item{display:flex;align-items:center;gap:.75rem;padding:.75rem 1rem;border:1px solid var(--border);border-radius:10px}.item-label{flex:1;display:flex;align-items:center;gap:.75rem;cursor:pointer}.item-label input[type=checkbox]{width:18px;height:18px;accent-color:var(--primary);cursor:pointer}.item-text{word-break:break-word}.item.done .item-text{text-decoration:line-through;color:var(--muted)}.delete-btn{background:transparent;border:none;color:var(--muted);font-size:1rem;cursor:pointer;padding:.25rem .5rem;border-radius:6px}.delete-btn:hover{color:var(--danger)}.empty{text-align:center;color:var(--muted);padding:1.5rem}.footer{display:flex;justify-content:space-between;align-items:center;margin-top:1.25rem;padding-top:1rem;border-top:1px solid var(--border);font-size:.875rem;color:var(--muted)}.clear-btn{background:transparent;border:none;color:var(--muted);cursor:pointer;font-size:.875rem}.clear-btn:hover{color:var(--danger)}