*{margin:0;padding:0;box-sizing:border-box}:root{--bg: #0a0a0a;--surface: #141414;--surface-hover: #1a1a1a;--border: #262626;--text: #fafafa;--text-muted: #737373;--accent: #e5e5e5;--accent-hover: #ffffff;--radius: 12px;--green: #22c55e;--green-dim: #16a34a;--red: #ef4444}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Inter,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:var(--bg);color:var(--text);min-height:100vh;display:flex;justify-content:center;align-items:flex-start;padding-top:8vh}#root{width:100%;max-width:480px;padding:2rem}.app{display:flex;flex-direction:column;gap:1.25rem}.header{text-align:center;margin-bottom:.5rem}.header h1{font-size:1.75rem;font-weight:600;letter-spacing:-.02em;color:var(--text)}.header p{margin-top:.5rem;font-size:.875rem;color:var(--text-muted)}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1rem}.todo-form{display:flex;gap:.5rem}.todo-input{flex:1;padding:.625rem .875rem;font-size:.875rem;font-family:inherit;background:var(--bg);border:1px solid var(--border);border-radius:8px;color:var(--text);outline:none;transition:border-color .15s}.todo-input::placeholder{color:var(--text-muted)}.todo-input:focus{border-color:#444}.todo-add-btn{padding:.625rem 1.25rem;font-size:.875rem;font-weight:500;font-family:inherit;cursor:pointer;border-radius:8px;border:none;background:var(--text);color:var(--bg);transition:opacity .15s;white-space:nowrap}.todo-add-btn:hover:not(:disabled){opacity:.9}.todo-add-btn:disabled{opacity:.3;cursor:not-allowed}.todo-list{list-style:none;display:flex;flex-direction:column}.todo-item{display:flex;align-items:center;gap:.75rem;padding:.75rem .25rem;border-bottom:1px solid var(--border);transition:opacity .2s}.todo-item:last-child{border-bottom:none}.todo-item.completed{opacity:.5}.todo-item.completed .todo-title{text-decoration:line-through}.todo-checkbox{width:22px;height:22px;min-width:22px;border-radius:6px;border:1.5px solid var(--border);background:transparent;cursor:pointer;display:flex;align-items:center;justify-content:center;color:var(--green);transition:border-color .15s,background .15s;padding:0}.todo-checkbox:hover{border-color:#444}.todo-item.completed .todo-checkbox{border-color:var(--green-dim);background:#22c55e1a}.todo-title{flex:1;font-size:.9rem;line-height:1.4;cursor:default;-webkit-user-select:none;user-select:none}.todo-edit-input{flex:1;font-size:.9rem;font-family:inherit;padding:.25rem .5rem;background:var(--bg);border:1px solid #444;border-radius:6px;color:var(--text);outline:none}.todo-delete{width:28px;height:28px;min-width:28px;border-radius:6px;border:none;background:transparent;color:var(--text-muted);cursor:pointer;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .15s,color .15s,background .15s;padding:0}.todo-item:hover .todo-delete{opacity:1}.todo-delete:hover{color:var(--red);background:#ef44441a}.todo-empty{text-align:center;font-size:.875rem;color:var(--text-muted);padding:1.5rem 0}