/* Main Kanban Board Structure */
.kanban-board {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 15px;
    margin-top: 20px;
    min-height: 50vh;
}

.kanban-column {
    background-color: var(--light-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px;
    display: flex;
    flex-direction: column;
    transition: box-shadow 0.2s ease-in-out, border-color 0.2s ease-in-out;
}

.kanban-column-header {
    padding: 10px;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 10px;
}

.kanban-column-header h3 {
    margin: 0;
    text-align: center;
    font-size: 1.1em;
}

.kanban-column-cards {
    flex-grow: 1;
    min-height: 150px; /* Ensures drop zone is available when empty */
}

/* MODIFIED: Group Header inside Kanban Column */
.kanban-group-header {
    margin: 10px 0 8px;
    color: var(--secondary-color);
    font-weight: bold;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 5px;
}
.kanban-group-header:first-child {
    margin-top: 0;
}
html.dark-mode .kanban-group-header {
    color: var(--dark-color);
}

/* NEW: Empty Column Message */
.kanban-empty-message {
    text-align: center;
    padding: 20px;
    color: var(--secondary-color);
    font-style: italic;
}
html.dark-mode .kanban-empty-message {
    color: #cccccc;
}

/* Kanban Card Styling */
.kanban-card {
    background-color: var(--container-bg);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    padding: 15px;
    margin-bottom: 10px;
    cursor: grab;
    position: relative;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    display: flex;
    flex-direction: column;
    min-height: 160px;
    border-left: 4px solid transparent;
    transition: box-shadow 0.3s ease-in-out, border-color 0.3s ease-in-out;
}

/* NEW: Accent bar colors */
.kanban-card.priority-high { border-left-color: var(--danger-color); }
.kanban-card.priority-medium { border-left-color: var(--warning-color); }
.kanban-card.priority-low { border-left-color: var(--secondary-color); }

/* NEW: Glow effect for In Progress card */
.kanban-card.is-in-progress {
    border-color: var(--success-color);
    box-shadow: 0 0 12px rgba(40, 167, 69, 0.5);
}


.kanban-card-main-content {
    flex-grow: 1;
}

.kanban-card.is-completed {
    cursor: default;
}

.kanban-card:active {
    cursor: grabbing;
}

.kanban-card.sortable-ghost {
    opacity: 0.4;
    background: var(--primary-color);
}

.kanban-card-title {
    font-weight: 600;
    margin: 0 0 8px;
    word-wrap: break-word;
    font-size: 1.05em;
    color: var(--dark-color);
}

.kanban-card-meta {
    font-size: 0.8em;
    color: var(--secondary-color);
    margin-bottom: 8px;
}
.kanban-card-meta .meta-line {
    display: block;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

html.dark-mode .kanban-card-meta { color: #a9a9a9; }

.kanban-card-meta .due-date.overdue {
    color: var(--danger-color);
    font-weight: bold;
}

.kanban-card-description {
    font-size: 0.85em;
    color: var(--secondary-color);
    margin-bottom: 10px;
    max-width: 100%;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    min-height: 2.4em;
}
html.dark-mode .kanban-card-description { color: #cccccc; }

.kanban-card-timer {
    font-size: 1.1em;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 8px;
}

.kanban-card-actions-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px; 
    margin-top: 10px;
    padding: 8px 0; 
    border-top: 1px solid var(--border-color);
}


.kanban-card-actions-bar button {
    padding: 6px 8px; 
    font-size: 13px;
    flex-grow: 1; 
}

.kanban-card-actions-bar .btn-warning {
    color: #343a40; 
}

.kanban-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 8px;
    border-top: 1px solid var(--border-color);
}

.kanban-card-actions-bar,
.kanban-card .kanban-card-footer {
    margin-top: auto;
}


.kanban-card-footer .footer-links,
.kanban-card-footer .footer-icons {
    display: flex;
    align-items: center;
    gap: 10px;
}
.kanban-card-footer .footer-links span {
    font-size: 0.8em;
    color: var(--primary-color);
    cursor: pointer;
    text-decoration: none;
}
.kanban-card-footer .footer-links span:hover {
    text-decoration: underline;
}
.kanban-card-footer .footer-icons .icon-group {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 0.85em;
    color: var(--secondary-color);
}
html.dark-mode .kanban-card-footer .footer-icons .icon-group { 
    color: #a9a9a9; 
}

.view-switcher { display: inline-flex; border: 1px solid var(--border-color); border-radius: 4px; overflow: hidden; margin-left: 20px; }
.view-switcher button { background-color: transparent; color: var(--dark-color); border: none; border-left: 1px solid var(--border-color); padding: 6px 12px; cursor: pointer; font-size: 14px; }
.view-switcher button:first-child { border-left: none; }
.view-switcher button.active { background-color: var(--primary-color); color: #fff; }

.kanban-column.drop-target-valid {
    box-shadow: 0 0 15px rgba(40, 167, 69, 0.5);
    border-color: var(--success-color);
}

/* --- RESPONSIVE STYLES --- */
@media (max-width: 768px) {
    .kanban-board {
        grid-template-columns: repeat(4, 280px); /* Set fixed width for columns */
        overflow-x: auto; /* Enable horizontal scrolling */
        padding-bottom: 15px; /* Add space for scrollbar */
        -webkit-overflow-scrolling: touch; /* Smooth scrolling on iOS */
    }
    .kanban-card { 
        cursor: default; /* Remove grab cursor on touch devices */
    }
}

/* Desktop-only hover effect for buttons */
@media (min-width: 769px) {
    .kanban-card-actions-bar {
        opacity: 0;
        max-height: 0;
        overflow: hidden;
        margin-top: 0;
        padding: 0;
        border-top-color: transparent;
        transition: opacity 0.2s ease-in-out, max-height 0.2s ease-in-out, margin-top 0.2s, padding 0.2s, border-color 0.2s;
        gap: 5px; /* MODIFIED: Reduced gap for desktop to prevent wrapping */
    }

    .kanban-card-actions-bar button {
        flex-grow: 0; /* Prevent buttons from growing on desktop */
        padding: 6px 12px; /* Restore larger padding for desktop */
    }

    .kanban-card:hover .kanban-card-actions-bar {
        opacity: 1;
        max-height: 50px;
        margin-top: 10px;
        padding: 8px 0;
        border-top-color: var(--border-color);
    }
}

.kanban-card.kanban-card-locked {
    cursor: not-allowed;
}