:root {
    --bg-primary: #1B3C53;
    --bg-secondary: #91C8E4;
    --header: #555879;
    --button: #97B067;
    --buton-hover: #708745;
    --dark: #212121;
    --input: #F9F3EF;
    --delete: #E14434;
    --delete-hover: #851f14;
    --tick: #06923E;
    --circle: #E5E0D8;
    --hover: #F5F5F5;
}

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

.container {
    background: linear-gradient(to right, var(--bg-primary), var(--bg-secondary));
    min-height: 100vh;
    width: 100%;
    padding: 10px;
}

.app {
    width: 100%;
    max-width: 600px;
    margin: 100px auto;
    padding: 20px;
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 20px 20px 6px rgba(0, 0, 0, 0.2);
}

.header {
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 10px;
}

.title {
    color: var(--header);
    margin-right: 15px;
}

.to-do-icon {
    width: 50px;
    height: auto;
}

.input {
    display: flex;
    align-items: center;
    background: var(--input);
    border-radius: 30px;
    padding-left: 20px;
    margin-bottom: 25px;
}

#input-box {
    flex: 1;
    border: none;
    outline: none;
    font-size: 14px;
    background: transparent;
}

#add-btn {
    border: none;
    outline: none;
    padding: 15px 40px;
    color: #fff;
    background-color: var(--button);
    font-size: 16px;
    cursor: pointer;
    border-radius: 30px;
    transition: background-color 0.2s;
}

#add-btn:hover {
    background-color: var(--buton-hover);
}

#task-list {
    margin-top: 10px;
}

.task-item {
    display: flex;
    align-items: center;
    list-style: none;
    cursor: pointer;
    font-size: 18px;
    padding: 12px;
}

.task-item:hover {
    background-color: var(--hover);
    border-radius: 20px;
}

.task-text {
    flex: 1;
    color: var(--dark);
}

.edit-input {
    font-size: 15px;
    padding: 5px;
    border-radius: 5px;
    border: 1px solid #ccc;
}

.fa-trash {
    color: var(--delete);
    font-size: 20px;
    transition: color 0.2s;
    padding: 5px;
}

.fa-trash:hover {
    color: var(--delete-hover)
}

.checked span {
    text-decoration: line-through;
    color: var(--dark);
    opacity: 0.6;
}

.li-tick {
    color: var(--tick);
    font-size: 20px;
    margin-right: 15px;
}

.li-circle {
    color: var(--circle);
    font-size: 20px;
    margin-right: 15px;
}