:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}@media (prefers-color-scheme: light){:root{color:#213547;background-color:#fff}a:hover{color:#747bff}button{background-color:#f9f9f9}}:root{--primary-gradient: linear-gradient(135deg, #4b6cb7 0%, #182848 100%);--accent-gradient: linear-gradient(135deg, #6b73ff 0%, #000dff 100%);--surface-gradient: linear-gradient(135deg, #1e2a3b 0%, #121827 100%);--text-primary: #ffffff;--text-secondary: #a0a0a0;--background: #0a0e17;--surface: #151c2c;--error: #ff4b4b;--success: #00c853;--card-shadow: 0 8px 32px 0 rgba(0, 0, 0, .37);--glass-background: rgba(255, 255, 255, .05)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;background-color:var(--background);color:var(--text-primary);min-height:100vh;background-image:radial-gradient(circle at top right,rgba(23,111,235,.1),transparent 40%),radial-gradient(circle at bottom left,rgba(111,23,235,.1),transparent 40%)}.app{min-height:100vh;display:flex;justify-content:center;padding:2rem}.container{width:100%;max-width:500px;background:var(--surface);border-radius:24px;box-shadow:var(--card-shadow);padding:2rem;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border:1px solid rgba(255,255,255,.05)}h1{background:var(--accent-gradient);-webkit-background-clip:text;background-clip:text;color:transparent;font-size:2rem;font-weight:700;margin-bottom:2rem;text-align:center}.input-container{display:flex;gap:1rem;margin-bottom:2rem;position:relative}input[type=text]{flex:1;padding:1rem 1.5rem;background:var(--glass-background);border:1px solid rgba(255,255,255,.1);border-radius:12px;font-size:1rem;color:var(--text-primary);transition:all .3s ease}input[type=text]:focus{outline:none;border-color:#fff3;box-shadow:0 0 0 2px #6b73ff33}button{background:var(--accent-gradient);color:#fff;border:none;border-radius:12px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .3s ease}button:hover{transform:translateY(-2px);box-shadow:0 5px 15px #6b73ff66}.add-button{width:48px;height:48px;font-size:1.5rem}.delete-button{background:transparent;color:var(--text-secondary);width:36px;height:36px;border-radius:8px}.delete-button:hover{background:#ff4b4b1a;color:var(--error);transform:translateY(0);box-shadow:none}.todo-list{list-style:none;display:flex;flex-direction:column;gap:.75rem}.todo-item{display:flex;align-items:center;gap:1rem;padding:1rem;background:var(--glass-background);border-radius:12px;border:1px solid rgba(255,255,255,.05);transition:all .3s ease}.todo-item:hover{transform:translate(4px);background:#ffffff14}.todo-item input[type=checkbox]{-webkit-appearance:none;-moz-appearance:none;appearance:none;width:22px;height:22px;border:2px solid rgba(255,255,255,.2);border-radius:6px;cursor:pointer;position:relative;transition:all .3s ease}.todo-item input[type=checkbox]:checked{background:var(--accent-gradient);border-color:transparent}.todo-item input[type=checkbox]:checked:after{content:"✓";position:absolute;color:#fff;font-size:14px;top:50%;left:50%;transform:translate(-50%,-50%)}.todo-item span{flex:1;font-size:1rem;transition:all .3s ease}.todo-item.completed span{text-decoration:line-through;color:var(--text-secondary);opacity:.7}