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

.container {
    width: 100%;
    min-height: 100vh;
    background: linear-gradient(135deg,
    #ff6b6b,
    #4ecdc4,
    #45b7d1,
    #96ceb4,
    #ffeaa7,
    #fd79a8);
    padding: 10px;
}

.todo-app {
    width: 100%;
    max-width: 540px;
    background: #fff;
    margin: 100px auto 20px;
    padding: 40px 30px 70px;
    border-radius: 10px;
}

.todo-app h2 {
    color: #002765;
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}

.todo-app h2 img {
    width: 30px;
    margin-left: 10px;
}

.row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #edeef0;
    border-radius: 30px;
    padding: 20px;
    margin-bottom: 25px;
}

label {
    font-size: 14px;
    color: #666;
    margin-right: 10px;
    min-width: 80px;
}

input {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    padding: 10px;
    font-weight: 400;
}

input:focus {
    background: rgba(255, 255, 255, 0.8);
    border-radius: 5px;
}

button {
    border: none;
    outline: none;
    padding: 16px 50px;
    background: #ff5945;
    color: #fff;
    font-size: 16px;
    cursor: pointer;
    border-radius: 40px;
    transition: background-color 0.3s ease;
}

button:hover {
    background: #e04535;
}

ul li {
    list-style: none;
    font-size: 17px;
    padding: 12px 8px 12px 50px;
    user-select: none;
    cursor: pointer;
    position: relative;
    border-bottom: 1px solid #f0f0f0;
    transition: background-color 0.2s ease;
}

ul li:hover {
    background: #f9f9f9;
}

ul li::before {
    content: '';
    position: absolute;
    height: 28px;
    width: 28px;
    border-radius: 50%;
    background-image: url(images/unchecked.png);
    background-size: cover;
    background-position: center;
    top: 12px;
    left: 8px;
}

ul li::before {
    content: '';
    position: absolute;
    height: 28px;
    width: 28px;
    border-radius: 50%;
    background: #ddd;
    border: 2px solid #bbb;
    top: 12px;
    left: 8px;
}

ul li.checked {
    color: #555;
    text-decoration: line-through;
    opacity: 0.7;
}

ul li.checked::before {
    background: #4CAF50;
    border-color: #4CAF50;
}

ul li span {
    position: absolute;
    right: 0;
    top: 5px;
    width: 40px;
    height: 40px;
    font-size: 22px;
    color: #555;
    line-height: 40px;
    text-align: center;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s ease;
}

ul li span:hover {
    background: #ff5945;
    color: white;
    transform: scale(1.1);
}

#list-container:empty::after {
    content: "No tasks yet. Add one above!";
    display: block;
    text-align: center;
    color: #999;
    font-style: italic;
    padding: 20px;
}

@media (max-width: 600px) {
    .todo-app {
        margin: 50px auto 20px;
        padding: 30px 20px 50px;
    }

    .row {
        flex-direction: column;
        gap: 15px;
        align-items: stretch;
    }

    label {
        min-width: auto;
        margin-right: 0;
    }

    button {
        padding: 12px 30px;
    }
}