* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif
}

body {
    background: radial-gradient(circle,rgb(245, 9, 249),rgb(154, 13, 255),rgb(0, 34, 255),rgb(7, 255, 255));
    color: #2b2d42;
    line-height: 1.6;
    min-height: 100vh;
    padding: 20px,
}

.container {
    max-width: 600px;
    margin: 30px auto;
    background: #fff;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, .1);
    padding: 30px;

    
}



header {
    text-align: center;
    margin-bottom: 30px;
}

h1 {
    background: linear-gradient(to right, rgb(255, 2, 27), rgb(14, 66, 255), rgb(187, 0, 184));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    -webkit-background-clip: text;
    font-size: 40px;
    margin-bottom: 10px;
    font-weight: 700;
}

.subtitle {
    color: #000000;
    font-size: 18px;
    font-weight: bolder;
    margin-bottom: 20px
}

.input-section {
    display: flex;
    gap: 10px;
    margin-bottom: 30px
}

#taskInput {
    flex: 1;
    padding: 15px 20px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 16px;
    transition: all .3s
}

#taskInput:focus {
    border-color: #4361ee;
    outline: 0;
    box-shadow: 0 0 0 3px rgba(67, 97, 238, .1)
}

#addButton {
    background: #4361ee;
    color: #fff;
    border: 0;
    padding: 15px 25px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: all .3s
}

#addButton:hover {
    background: #3651d4;
    transform: translateY(-2px)
}

#addButton i {
    margin-right: 8px
}

.tasks-section {
    margin-top: 20px
}

h2 {
    color: #2b2d42;
    font-weight: 600;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #f0f0f0;
    font-size: 24px
}

h2 i {
    color: #4361ee;
    margin-right: 10px
}

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

.task-item {
    display: flex;
    align-items: center;
    padding: 15px;
    background: #fff;
    margin-bottom: 10px;
    border-radius: 10px;
    border-left: 5px solid #4361ee;
    box-shadow: 0 3px 10px rgba(0, 0, 0, .09);
    transition: all .3s
}

.task-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, .1)
}

.task-item.completed {
    opacity: .7;
    border-left-color: #38b000
}

.task-checkbox {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 2px solid #4361ee;
    margin-right: 15px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all .3s
}


.task-checkbox.checked {
    background: #38b000;
    border-color: #38b000;
    color: white;
}


.task-text {
    flex: 1;
    margin-right: 15px;
    font-size: 16px
}

.task-item.completed .task-text {
    text-decoration: line-through;
    color: #8d99ae
}

.delete-btn {
    background: transparent;
    color: #e63946;
    border:none;
    font-size: 20px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all .3s
}

.delete-btn:hover {
    background: rgba(230, 57, 70, .1)
}

.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: #8d99ae
}

.empty-state i {
    font-size: 80px;
    margin-bottom: 20px;
    color: #8d99ae;
    opacity: .5
}

.empty-state h3 {
    font-size: 22px;
    margin-bottom: 10px
}

.empty-state p {
    font-size: 16px
}

.steps {
    margin-top: 30px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
    font-size: 15px;
    color: #8d99ae
}

.steps h3 {
    color: #2b2d42;
    margin-bottom: 10px;
    font-size: 18px
}

.steps h3 i {
    color: #4361ee;
    margin-right: 10px
}

.steps ul {
    padding-left: 20px
}

.steps li {
    margin-bottom: 8px;
    display: flex;
    align-items: flex-start;
    font-size: 15px
}

.steps li i {
    color: #38b000;
    margin-right: 10px;
    margin-top: 3px
}

/* responsive */
@media(max-width:600px) {
    .container {
        padding: 20px;
        margin: 10px auto
    }

    h1 {
        font-size: 32px
    }

    .subtitle {
        font-size: 16px
    }

    .input-section {
        flex-direction: column
    }

    #addButton {
        width: 100%
        
    }

    h2 {
        font-size: 20px
    }

    .steps h3 {
        font-size: 16px
    }

    .steps li {
        font-size: 14px
    }
}