.container{max-width:700px;width:100%;margin:20px auto;padding:20px;border-radius:20px;box-shadow:0 0 10px #0000001a;font-family:Arial,sans-serif;transition:background-color .3s,color .3s;box-sizing:border-box}.light{background-color:#f9f9f9;color:#333}.dark{background-color:#222;color:#eee}.input-container{display:flex;gap:15px;margin-bottom:15px}input[type=text]{flex:1;padding:10px;font-size:16px;border:1px solid #ccc;border-radius:4px;outline:none;transition:border-color .2s;width:100%;box-sizing:border-box}input[type=text]:focus{border-color:#007bff}button{padding:10px 20px;font-size:30px;border:none;border-radius:4px;cursor:pointer;background-color:#079119;color:#fff;transition:background-color .3s;white-space:nowrap}button:hover{background-color:#067115}.theme-btn{margin-bottom:15px;background-color:#fdfeff;font-size:24px;color:#222}.theme-btn:hover{background-color:#5a6268;color:#fff}.todo-list{list-style-type:none;padding:0}.todo-list li{display:flex;justify-content:space-between;align-items:center;padding:8px 10px;background-color:#0000000d;margin-bottom:8px;border-radius:4px;transition:background-color .3s;flex-wrap:wrap}.dark .todo-list li{background-color:#ffffff1a}.delete-btn{background-color:#dc143c;color:#fff;border:none;padding:6px 10px;border-radius:4px;cursor:pointer;font-size:14px;margin-left:10px}.delete-btn:hover{background-color:#8b0000}h1{text-align:center;font-size:32px}@media (max-width: 600px){.input-container{flex-direction:column;gap:10px}button,.theme-btn{width:100%;font-size:22px}input[type=text]{font-size:18px}h1{font-size:24px}.todo-list li{flex-direction:column;align-items:flex-start}.delete-btn{margin-top:8px;align-self:flex-end}}