*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Body */
body {
    font-family: Arial, sans-serif;
    background: #0ad3de;
    min-height: 100vh;

    display: flex;
    justify-content: center;
    align-items: center;
}

/* Main Todo Container */
.todo-container {
    width: 90%;
    max-width: 500px;
    background: rgb(80, 244, 241);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
}

/* Heading */
.todo-container h1 {
    text-align: center;
    margin-bottom: 25px;
    color: #333;
}

/* Input Area */
.input-area {
    display: flex;
    gap: 10px;
    margin-bottom: 25px;
}

/* Input */
#todo-input {
    flex: 1;
    padding: 12px 15px;
    border: 1px solid #ccc;
    border-radius: 8px;
    font-size: 16px;
    outline: none;
}

#todo-input:focus {
    border-color: #c5d6eb;
}

/* Add Button */
#add-btn {
    padding: 12px 18px;
    border: none;
    border-radius: 8px;
    background: #920707;
    color: rgb(251, 249, 249);
    font-size: 15px;
    cursor: pointer;
}

#add-btn:hover {
    background: #ac0606;
}

/* Todo List */
#todo-list {
    list-style: none;
}

/* Todo Item */
#todo-list li {
    display: flex;
    align-items: center;
    gap: 12px;

    padding: 12px;
    margin-bottom: 10px;

    background: #396589;
    border-radius: 8px;
    border: 1px solid #ce1515;
}

/* Checkbox */
#todo-list li input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

/* Todo Text */
#todo-list li span {
    flex: 1;
    font-size: 16px;
    color: #333;
}

/* Delete Button */
#todo-list li button {
    padding: 7px 12px;
    border: none;
    border-radius: 6px;
    background: #922115;
    color: white;
    cursor: pointer;
}

#todo-list li button:hover {
    background: #801a0f;
}

/* Mobile Responsive */
@media (max-width: 500px) {

    .todo-container {
        padding: 20px;
    }

    .input-area {
        flex-direction: column;
    }

    #add-btn {
        width: 100%;
    }
}