/* Grade Reference Chart Widget Styles */

/* Grade Reference Chart Widget */
.grade-reference {
    margin-top: 24px;
    background: var(--bg-light);
    border-radius: 12px;
    box-shadow: var(--shadow);
    border: 1px solid rgba(255, 111, 0, 0.12);
    overflow: hidden;
}

.grade-reference-toggle {
    width: 100%;
    padding: 16px 24px;
    background: var(--surface-hover);
    border: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    transition: all 0.2s ease;
}

.grade-reference-toggle:hover {
    background: var(--primary-light);
    color: var(--primary-color);
}

.grade-reference-toggle span:first-child {
    display: flex;
    align-items: center;
    gap: 8px;
}

.toggle-icon {
    font-size: 14px;
    transition: transform 0.3s ease;
}

.grade-reference-toggle.active .toggle-icon {
    transform: rotate(180deg);
}

.grade-chart-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.grade-chart-content.hidden {
    max-height: 0;
}

.grade-chart-content:not(.hidden) {
    max-height: 2000px; /* Prevent clipping on small screens */
    padding: 20px 24px;
}

.grade-chart-table {
    width: 100%;
    border-collapse: collapse;
    min-width: auto;
}

.grade-chart-table thead {
    background: var(--primary-color);
    color: white;
}

.grade-chart-table th {
    padding: 12px 16px;
    font-weight: 600;
    font-size: 14px;
    text-align: left;
    border-bottom: none;
    background: var(--primary-color);
    color: white;
}

.grade-chart-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-light);
    font-size: 14px;
}

/* Ensure cells calculate widths predictably */
.grade-chart-table th,
.grade-chart-table td {
    box-sizing: border-box;
}

/* Keep Marks and Assessment on a single line */
.grade-chart-table th:nth-child(3),
.grade-chart-table td:nth-child(3),
.grade-chart-table th:nth-child(4),
.grade-chart-table td:nth-child(4) {
    white-space: nowrap;
}

/* Column width guidance to help text fit in one line */
.grade-chart-table th:nth-child(1),
.grade-chart-table td:nth-child(1) { width: 22%; }
.grade-chart-table th:nth-child(2),
.grade-chart-table td:nth-child(2) { width: 18%; }
.grade-chart-table th:nth-child(3),
.grade-chart-table td:nth-child(3) { width: 22%; }
.grade-chart-table th:nth-child(4),
.grade-chart-table td:nth-child(4) { width: 38%; }

.grade-chart-table tbody tr:hover td {
    background: var(--primary-light);
}

.grade-chart-table tbody tr:last-child td {
    border-bottom: none;
}

/* Grade row colors */
.grade-chart-table .grade-a td:first-child,
.grade-chart-table .grade-a-minus td:first-child {
    color: #4CAF50;
}

.grade-chart-table .grade-b-plus td:first-child,
.grade-chart-table .grade-b td:first-child,
.grade-chart-table .grade-b-minus td:first-child {
    color: #2196F3;
}

.grade-chart-table .grade-c-plus td:first-child,
.grade-chart-table .grade-c td:first-child,
.grade-chart-table .grade-c-minus td:first-child {
    color: #FF9800;
}

.grade-chart-table .grade-d-plus td:first-child,
.grade-chart-table .grade-d td:first-child {
    color: #FF5722;
}

.grade-chart-table .grade-f td:first-child {
    color: #F44336;
    font-weight: 700;
}

/* Dark mode for grade chart */
[data-theme="dark"] .grade-reference {
    background: var(--bg-light);
    border-color: rgba(255, 111, 0, 0.2);
}

[data-theme="dark"] .grade-reference-toggle {
    background: var(--surface-hover);
    color: var(--text-primary);
}

[data-theme="dark"] .grade-reference-toggle:hover {
    background: var(--primary-light);
}

[data-theme="dark"] .grade-chart-table th {
    background: var(--primary-color);
}

[data-theme="dark"] .grade-chart-table td {
    background: var(--bg-light);
    border-bottom-color: var(--border-color);
}

[data-theme="dark"] .grade-chart-table tbody tr:hover td {
    background: var(--surface-hover);
}

/* Responsive */
@media (max-width: 768px) {
    .grade-chart-table {
        font-size: 12.5px;
        table-layout: fixed;        /* Fit columns within viewport */
        width: 100%;
    }
    
    .grade-chart-table th,
    .grade-chart-table td {
        padding: 8px 10px;
        white-space: normal;        /* Allow wrapping by default */
        word-break: break-word;     /* Break long words */
    }

    /* Override: keep Marks and Assessment on one line on mobile too */
    .grade-chart-table th:nth-child(3),
    .grade-chart-table td:nth-child(3),
    .grade-chart-table th:nth-child(4),
    .grade-chart-table td:nth-child(4) {
        white-space: nowrap !important;
        word-break: normal !important;
        font-size: 12px;            /* Slightly smaller to prevent wrapping */
    }

    /* Rebalance column widths for tight screens */
    .grade-chart-table th:nth-child(1),
    .grade-chart-table td:nth-child(1) { width: 18%; }
    .grade-chart-table th:nth-child(2),
    .grade-chart-table td:nth-child(2) { width: 16%; }
    .grade-chart-table th:nth-child(3),
    .grade-chart-table td:nth-child(3) { width: 26%; }
    .grade-chart-table th:nth-child(4),
    .grade-chart-table td:nth-child(4) { width: 40%; }

    /* Hide Assessment column on mobile */
    .grade-chart-table th:nth-child(4),
    .grade-chart-table td:nth-child(4) {
        display: none;
    }

    /* Reallocate widths to remaining columns */
    .grade-chart-table th:nth-child(1),
    .grade-chart-table td:nth-child(1) { width: 34%; }
    .grade-chart-table th:nth-child(2),
    .grade-chart-table td:nth-child(2) { width: 22%; }
    .grade-chart-table th:nth-child(3),
    .grade-chart-table td:nth-child(3) { width: 44%; white-space: nowrap !important; }
    
    .grade-reference-toggle {
        padding: 14px 16px;
        font-size: 15px;
    }
}

@media (max-width: 480px) {
    .grade-chart-table { font-size: 12px; }
    .grade-chart-table th,
    .grade-chart-table td { padding: 7px 8px; }
    .grade-chart-table th:nth-child(3),
    .grade-chart-table td:nth-child(3),
    .grade-chart-table th:nth-child(4),
    .grade-chart-table td:nth-child(4) { font-size: 11.5px; }
    /* Slightly favor Marks/Assessment space further */
    .grade-chart-table th:nth-child(1),
    .grade-chart-table td:nth-child(1) { width: 16%; }
    .grade-chart-table th:nth-child(2),
    .grade-chart-table td:nth-child(2) { width: 15%; }
    .grade-chart-table th:nth-child(3),
    .grade-chart-table td:nth-child(3) { width: 29%; }
    .grade-chart-table th:nth-child(4),
    .grade-chart-table td:nth-child(4) { width: 40%; }

    /* Also hide Assessment on very small screens */
    .grade-chart-table th:nth-child(4),
    .grade-chart-table td:nth-child(4) { display: none; }

    /* Reallocate to three columns */
    .grade-chart-table th:nth-child(1),
    .grade-chart-table td:nth-child(1) { width: 36%; }
    .grade-chart-table th:nth-child(2),
    .grade-chart-table td:nth-child(2) { width: 24%; }
    .grade-chart-table th:nth-child(3),
    .grade-chart-table td:nth-child(3) { width: 40%; white-space: nowrap !important; }
}

/* (Removed extra small device card-stacking to keep default table styling) */