:root {
    --primary-bg: #f0f4f8;
    --card-bg: #ffffff;
    --card-shadow: rgba(0, 0, 0, 0.1);
    --primary-text: #333;
    --secondary-text: #555;
    --accent-color: #3498db; /* Soft blue accent color */
    --button-bg: #3498db;
    --button-text: #ffffff;
    --input-bg: #ffffff;
    --input-border: #ddd;
    --input-shadow: rgba(0, 0, 0, 0.1);
    --icon-color: #ffffff;
    --placeholder-text: #999;
    --sort-button-bg: #ffffff; /* Background color for sorting buttons */
    --sort-button-text: #3498db; /* Text color for sorting buttons */
    --sort-button-border: #ddd; /* Border color for sorting buttons */
}

body {
    font-family: 'Roboto', sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background-color: var(--primary-bg);
}

.stylish-title {
    font-family: 'Raleway', sans-serif;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-text);
    text-transform: uppercase;
    margin: 20px 0;
    text-align: center;
    letter-spacing: 2px;
}

.container {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 20px;
}

.columns {
    display: flex;
    justify-content: space-between;
    gap: 20px;
}

.card {
    display: flex;
    flex-direction: column;
    background: var(--card-bg);
    border-radius: 10px;
    box-shadow: 0 4px 6px var(--card-shadow);
    overflow: hidden;
    position: relative;
    flex: 1;
    min-height: 200px;
}

.card-header {
    font-size: 1.25rem;
    font-weight: 500;
    padding: 15px;
    background: var(--accent-color);
    color: var(--icon-color);
    border-radius: 10px 10px 0 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-body {
    padding: 15px;
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow-y: auto; /* Enable scrolling for overflow content */
    position: relative;
    justify-content: center; /* Center content vertically */
    align-items: center; /* Center content horizontally */
}

.card-body .placeholder-text {
    color: var(--placeholder-text);
    text-align: center;
    margin: auto;
}

.list-group {
    width: 100%;
    padding: 0;
    margin: 0;
    list-style: none;
}

.list-group-item {
    background: var(--card-bg);
    margin-bottom: 10px;
    padding: 15px;
    border-radius: 10px;
    box-shadow: 0 4px 6px var(--card-shadow);
    border: none;
    cursor: grab;
    position: relative;
}

.list-group-item h5 {
    margin-bottom: 10px;
    font-weight: 500;
    color: var(--primary-text);
}

.list-group-item p {
    margin: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--secondary-text);
}

.list-group-item .priority-indicator {
    width: 20px;
    height: 10px;
    border-radius: 2px;
    position: absolute;
    top: 10px;
    right: 10px;
    cursor: default;
}

.list-group-item div {
    display: flex;
    justify-content: flex-end;
    margin-top: 10px;
}

.list-group-item button {
    margin-left: 5px;
    background: var(--accent-color);
    border: none;
    border-radius: 5px;
    padding: 5px 10px;
    color: var(--button-text);
    box-shadow: 0 2px 4px var(--card-shadow);
}

.list-group-item button:focus {
    outline: none;
}

.list-group-item button .fas {
    color: var(--icon-color);
}

textarea,
input[type="text"],
input[type="date"],
select {
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 5px;
    padding: 10px;
    width: 100%;
    box-sizing: border-box;
    box-shadow: 0 2px 4px var(--input-shadow);
    color: var(--primary-text);
    font-family: 'Roboto', sans-serif;
    font-size: 1rem;
}

textarea {
    resize: none;
}

input[type="date"] {
    position: relative;
    padding: 10px;
    font-size: 1rem;
}

input[type="date"]::-webkit-calendar-picker-indicator {
    position: absolute;
    right: 10px;
    color: var(--accent-color);
    opacity: 0.6;
    cursor: pointer;
}

button#save-btn,
button#update-btn,
button#open-add-modal-btn {
    background: var(--button-bg);
    border: none;
    border-radius: 5px;
    padding: 10px 20px;
    color: var(--button-text);
    box-shadow: 0 4px 6px var(--card-shadow);
    cursor: pointer;
}

button#save-btn:focus,
button#update-btn:focus,
button#open-add-modal-btn:focus {
    outline: none;
}

button#open-add-modal-btn {
    display: flex;
    align-items: center;
}

button#open-add-modal-btn .fas {
    margin-right: 5px;
    color: var(--icon-color);
}

.tooltip-inner {
    max-width: 200px;
    background: var(--card-bg);
    color: var(--primary-text);
    border-radius: 5px;
    box-shadow: 0 2px 4px var(--card-shadow);
}

/* Additional styles for due date alignment */
.due-date {
    display: flex;
    align-items: center;
}

.due-date i {
    margin-right: 5px;
}

.sort-btn {
    background-color: var(--sort-button-bg) !important;
    color: var(--sort-button-text) !important;
    border: 1px solid var(--sort-button-border) !important;
}

.sort-btn:hover {
    background-color: var(--button-bg) !important;
    color: var(--button-text) !important;
}

/* Media Queries for Responsiveness */
@media (max-width: 768px) {
    .card-header {
        font-size: 1rem;
        padding: 10px;
    }

    .card-body {
        padding: 10px;
    }

    .list-group-item {
        padding: 10px;
    }

    .list-group-item h5 {
        margin-bottom: 5px;
    }

    .list-group-item div {
        margin-top: 5px;
    }
}

@media (max-width: 576px) {
    .stylish-title {
        font-size: 2rem;
    }

    .card-header {
        font-size: 0.875rem;
        padding: 8px;
    }

    .card-body {
        padding: 8px;
    }

    .list-group-item {
        padding: 8px;
    }

    .list-group-item h5 {
        margin-bottom: 5px;
    }

    .list-group-item div {
        margin-top: 5px;
    }

    button#save-btn,
    button#update-btn,
    button#open-add-modal-btn {
        padding: 8px 16px;
    }
}