*{
    margin:0;
    padding: 0;
    font-family: 'Poppins', sans-serif;
    box-sizing: border-box;
}

.container {
    width: 100%;
    min-height: 100vh;
    background: linear-gradient(135deg, #153677, #4e085f);
    padding: 10px;
}

.todo-app{
    width: 100%;
    max-width: 540px;
    margin: 0 auto;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 20px;
}

.todo-app h2 {
    display: flex;
    align-items: center;
    font-size: 2rem;
    margin-bottom: 20px;
    gap: 10px;
}

.input-row {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

#input-box {
    flex: 1;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 1rem;
}

#add-btn {
    padding: 10px 20px;
    background: #153677;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: background 0.2s;
}
#add-btn:hover {
    background: #4e085f;
}

#list-container {
    list-style: none;
    padding: 0;
}

#list-container li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    border-bottom: 1px solid #eee;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background 0.2s;
}
#list-container li.checked {
    text-decoration: line-through;
    color: #aaa;
}
#list-container li .close {
    color: #e74c3c;
    font-weight: bold;
    margin-left: 15px;
    cursor: pointer;
    font-size: 1.2em;
    transition: color 0.2s;
}
#list-container li .close:hover {
    color: #c0392b;
}