:root {
    --primary-color: #28a745;
    --secondary-color: #f8f9fa;
    --text-color: #333;
    --border-color: #ccc;
    --hover-color: #218838;
    --main-text-color: #fff;
    --drag-color: #e9ecef;
    --box-shadow: rgba(0, 0, 0, 0.1);
    --body-bg-color: #f4f4f4;
    --header-color: #333;
    --icon-color: #666;
    --icon-hover-color: #000;
    --done-color: gray;
    --popup-background-color: rgba(0, 0, 0, 0.6);
}

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

body {
    background-color: var(--body-bg-color);
    position: relative;
}

.container {
    width: 90%;
    max-width: 600px;
    margin: 80px auto;
    text-align: center;
    background-color: var(--main-text-color);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 12px var(--box-shadow);
}

.container h2 {
    margin-bottom: 20px;
    color: var(--header-color);
    font-size: 28px;
}

.add-task {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 20px;
}

.add-task #task-input {
    padding: 10px 15px;
    width: 70%;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 16px;
    transition: border 0.3s ease;
}

.add-task #add-btn {
    font-size: 24px;
    padding: 0 14px;
    border: none;
    border-radius: 6px;
    background-color: var(--primary-color);
    color: var(--main-text-color);
    cursor: pointer;
    transition: background-color 0.3s ease;
}

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

.search-task {
    margin: 10px 0;
}

.search-task #search-input {
    padding: 8px;
    width: 80%;
    font-size: 16px;
    border-radius: 5px;
    border: 1px solid #ccc;
}

.add-task #task-input:focus,
.search-task #search-input:focus {
    border-color: var(--primary-color);
    outline: none;
}


ul#task-list {
    list-style: none;
    padding: 0;
    margin-top: 10px;
    text-align: left;
}

ul#task-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 15px;
    margin-bottom: 10px;
    background-color: var(--secondary-color);
    border-left: 5px solid var(--primary-color);
    border-radius: 4px;
    transition: background-color 0.3s ease;
    cursor: pointer;
}

ul#task-list li:hover {
    background-color: var(--drag-color);
}


.task-text {
    flex: 1;
}

.actions {
    display: flex;
    gap: 10px;
}

.actions i {
    cursor: pointer;
    color: var(--icon-color);
    transition: color 0.2s ease;
    font-size: 16px;
}

.actions i:hover {
    color: var(--icon-hover-color);
}

.done .task-text {
    text-decoration: line-through;
    color: var(--done-color);
}

.edit-input {
    width: 80%;
    font-size: 16px;
    padding: 5px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    outline: none;
}

.edit-input:focus {
    border: 2px solid var(--primary-color);
}

li.dragging {
    opacity: 0.5;
    background-color: var(--drag-color);
}

.alert {
    display: none;
    position: fixed;
    top: 20px;
    left: 20px;
    width: 350px;
    color: var(--text-color);
    background-color: var(--secondary-color);
    border: 3px solid var(--primary-color);
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 8px var(--box-shadow);
    z-index: 1;
    transition: 0.3s;
    animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.popup {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--popup-background-color);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2;
    display: none;
}

.popup-content {
    background-color: #fff;
    padding: 30px 40px;
    border-radius: 10px;
    text-align: center;
    font-size: 20px;
    box-shadow: 0 0 15px var(--box-shadow);
}

.popup.show {
    display: flex !important;
}

.popup .popup-content .btn {
    padding: 10px 15px;
    background-color: var(--primary-color);
    color: var(--main-text-color);
    border-radius: 6px;
    border: none;
    margin-top: 20px;
    font-size: 18px;
    cursor: pointer;
    transition: 0.3s;
}

.popup .popup-content .btn:last-of-type {
    margin-left: 10px;
}

.popup .popup-content .btn:hover {
    background-color: var(--hover-color);
}