/* General Styles - Optimized for Laptop Screens */
html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden; /* key - prevents page scroll entirely */
    font-family: 'Montserrat', sans-serif;
    background-color: #f8f9fa;
    color: #333;
    font-size: 14px;
    line-height: 1.4;
}

.container {
    height: 100vh;
    display: flex;
    overflow: hidden; /* prevents body scroll caused by wide content */
}

/* Laptop-Optimized Sidebar */
.sidebar {
    flex: 0 0 260px;
    background-color: #1f3b57;
    color: #ffffff;
    padding: 15px;
    display: flex;
    flex-direction: column;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
    transition: width 0.3s ease;
    overflow: hidden; /* prevents sidebar scrolling */
    box-sizing: border-box;
}

.logo {
    width: 100%;
    height: auto;
    margin-bottom: 15px;
    max-height: 60px;
    object-fit: contain;
    flex-shrink: 0;
}

.sidebar-button {
    font-size: 14px;
    color: #ffffff;
    text-decoration: none;
    background-color: #294a67;
    padding: 10px 15px;
    border-radius: 5px;
    margin: 4px 0;
    transition: background-color 0.3s ease;
    text-align: center;
    flex-shrink: 0;
}

.sidebar-button:hover {
    background-color: #3b5d7a;
}

/* Laptop-Optimized Main Content */
.main-content {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    min-height: 0; /* key for flex children to allow inner scroll areas */
    overflow: hidden;
    padding: 20px;
    background-color: #ffffff;
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.05);
    box-sizing: border-box;
}

.header {
    flex: 0 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    flex-wrap: wrap;
    gap: 15px;
}

h1 {
    font-size: 28px;
    font-weight: 600;
    color: #1f3b57;
    margin: 0;
}

/* Laptop-Optimized Filter Menu */
.filter-menu {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
}

.filter-menu label {
    font-weight: 600;
    color: #1f3b57;
    font-size: 13px;
    white-space: nowrap;
}

.filter-select {
    padding: 6px 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 13px;
    transition: border-color 0.3s ease;
    min-width: 120px;
}

.filter-select:focus {
    border-color: #26ac97;
}

.filter-button, .clear-button {
    background-color: #26ac97;
    color: #ffffff;
    border: none;
    padding: 8px 16px;
    border-radius: 5px;
    font-size: 13px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    white-space: nowrap;
}

.filter-button:hover, .clear-button:hover {
    background-color: #218d78;
}

.show-archived-label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: #1f3b57;
    cursor: pointer;
    user-select: none;
}

.show-archived-label input[type="checkbox"] {
    margin: 0;
    cursor: pointer;
}

/* Laptop-Optimized Bulk Operations */
.bulk-operations {
    flex: 0 0 auto;
    display: flex;
    gap: 12px;
    align-items: center;
    margin-bottom: 12px;
    padding: 12px;
    background-color: #f8f9fa;
    border-radius: 8px;
    border: 1px solid #ddd;
    flex-wrap: wrap;
}

/* Form fills remaining space */
#data-form {
    flex: 1 1 auto;
    min-height: 0; /* important so the table container can scroll */
    display: flex;
    flex-direction: column;
}

.bulk-select-all {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    color: #1f3b57;
    cursor: pointer;
    font-size: 13px;
    white-space: nowrap;
}

.bulk-edit-button, .bulk-delete-button, .expand-all-button, .collapse-all-button {
    background-color: #26ac97;
    color: #ffffff;
    border: none;
    padding: 8px 16px;
    border-radius: 5px;
    font-size: 13px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    white-space: nowrap;
}

.bulk-operations .collapse-all-button {
    width: 170px;
}

.bulk-operations .bulk-save-button {
    flex: 1 1 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 16px;
    margin: 0;
    font-size: 13px;
    font-weight: normal;
    box-shadow: none;
}


.bulk-delete-button, .expand-all-button, .collapse-all-button {
    background-color: #26ac97;
}

.bulk-edit-button {
    background-color: #e4a112;
}

.expand-all-button:hover, .collapse-all-button:hover {
    background-color: #218d78;
}

.bulk-edit-button:hover {
    background-color: #e4a112;
}

.bulk-delete-button {
    background-color: #e74c3c;
}

.bulk-delete-button:hover {
    background-color: #c0392b;
}

.bulk-edit-button:disabled, .bulk-delete-button:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}

/* Laptop-Optimized Table Container */
.table-container {
    flex: 1 1 auto;
    min-height: 0; /* critical in flex layouts */
    overflow: auto; /* vertical & horizontal scroll here */
    border: 1px solid #ddd;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

#data-table {
    width: 100%;
    border-collapse: collapse;
    table-layout: fixed; /* keeps columns from blowing out width on long text */
    min-width: 850px; /* Optimized for laptop screens with all columns */
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 0;
    min-width: 850px; /* Optimized for laptop screens */
}

th, td {
    padding: 6px 4px;
    text-align: center;
    border: 1px solid #ddd;
    font-size: 12px;
}

/* Compact inputs and selects in table cells */
#data-table td input,
#data-table td select {
    padding: 4px 2px;
    font-size: 12px;
    box-sizing: border-box;
    max-width: 100%;
}

#data-table td input[type="number"] {
    text-align: center;
    -moz-appearance: textfield;
}

#data-table td input[type="number"]::-webkit-outer-spin-button,
#data-table td input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

th {
    background-color: #294a67;
    color: #ffffff;
    font-weight: 600;
    position: sticky;
    top: 0;
    z-index: 10;
}

td {
    color: #555;
}

/* Selection Column Styling */
.select-column {
    width: 40px;
    min-width: 40px;
    max-width: 40px;
    text-align: center;
}

/* Column Width Adjustments - Base (Desktop) */
.year-column {
    width: 65px;
    min-width: 60px;
}

.month-column {
    width: 65px;
    min-width: 60px;
}

.trucks-column {
    width: 60px;
    min-width: 55px;
}

.status-column {
    width: 95px;
    min-width: 90px;
}

.truck-type-column {
    width: 75px;
    min-width: 70px;
}

.phase-in-column {
    width: 65px;
    min-width: 60px;
}

.row-checkbox {
    cursor: pointer;
    transform: scale(1.1);
}

/* Group Header Styling */
.group-header {
    background-color: #f8f9fa;
    font-weight: bold;
    cursor: pointer;
    padding: 12px;
    border-bottom: 2px solid #ddd;
    font-size: 15px;
}

.group-header strong {
    font-size: 16px;
    font-weight: 700;
    color: #1f3b57;
}

.group-header:nth-child(even) {
    background-color: #ffffff;
}

.group-header:hover {
    background-color: #e9ecef;
}

.group-toggle {
    margin-right: 10px;
    font-size: 15px;
    font-weight: bold;
    color: #1f3b57;
}

.group-totals {
    font-size: 13px;
    color: #666;
    margin-left: 12px;
    font-weight: normal;
}

/* Data Row Styling */
.data-row {
    background-color: rgba(248, 249, 250, 0.95);
}

.data-row.even-group {
    background-color: rgba(255, 255, 255, 0.95);
}

.data-row:hover {
    background-color: rgba(38, 172, 151, 0.1);
}

.data-row.selected {
    background-color: rgba(0, 123, 255, 0.1);
}

.data-row.edit-mode {
    background-color: rgba(255, 193, 7, 0.1);
}

.data-row td:first-child {
    padding-left: 16px;
}

/* Unassigned Row Styling */
.data-row[data-customer=""] {
    background-color: rgba(255, 235, 59, 0.2);
    border-left: 4px solid #ffc107;
}

.data-row[data-customer=""]:hover {
    background-color: rgba(255, 235, 59, 0.3);
}

.data-row[data-customer=""] td:first-child {
    padding-left: 14px;
}

/* Laptop-Optimized Sidebar Buttons */
.add-button{
    background-color: #26ac97;
    color: #ffffff;
    border: none;
    padding: 12px 16px;
    border-radius: 5px;
    font-size: 15px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    width: 100%;
    margin: 8px 0;
    flex-shrink: 0;
}

.add-button:hover{
    background-color: #218d78;
}

.data-insights-button{
    background-color: #3498db;
    color: #ffffff;
    border: none;
    padding: 12px 16px;
    border-radius: 5px;
    font-size: 15px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    width: 100%;
    margin: 8px 0;
    flex-shrink: 0;
}

.data-insights-button:hover{
    background-color: #2980b9;
}

.logout-button, .save-button, .reload-button, .download-log-button {
    background-color: #e74c3c;
    color: #ffffff;
    border: none;
    padding: 10px 14px;
    border-radius: 5px;
    margin: 4px 0;
    font-size: 14px;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
    text-align: center;
    display: inline-block;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    width: 100%;
    flex-shrink: 0;
}

.save-button:hover, .reload-button:hover, .download-log-button:hover {
    background-color: darkred;
}

.logout-button:hover {
    background-color: #c0392b;
    transform: scale(1.02);
}

.logout-button:active {
    background-color: #a93226;
    transform: scale(0.98);
}

.logout-button:focus {
    outline: none;
    box-shadow: 0 0 0 4px rgba(231, 76, 60, 0.4);
}

/* Laptop-Optimized Total Trucks Container */
.total-trucks-container {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    background-color: white;
    padding: 14px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    color: black;
    font-family: Arial, sans-serif;
    width: 90%;
    margin: 10px 0;
    flex-shrink: 0;
    min-height: fit-content;
}

.total-trucks-container div {
    display: grid;
    grid-template-columns: 1fr 36px 36px 36px;
    column-gap: 6px;
    align-items: center;
    width: 100%;
    margin-bottom: 6px;
}

.total-trucks-container .totals-header {
    margin-bottom: 4px;
    border-bottom: 1px solid #e0e0e0;
    padding-bottom: 4px;
}

.total-trucks-container .totals-col-head {
    font-size: 11px;
    font-weight: 700;
    color: #1f3b57;
    text-align: right;
    letter-spacing: 0.5px;
}

.total-trucks-container strong {
    font-weight: bold;
    font-size: 12px;
}

.total-trucks-container span {
    font-size: 12px;
    text-align: right;
}

.total-trucks-container hr {
    width: 100%;
    height: 2px;
    background-color: green;
    border: none;
    margin: 8px 0;
    display: block;
}

.total-trucks-container .totals-total-row span {
    font-size: 14px;
    font-weight: bold;
    color: black;
}

/* Laptop-Optimized User Display */
.sidebar-user {
    margin-top: auto;
    padding: 12px;
    padding-bottom: 16px;
    font-size: 14px;
    background: #294a67;
    color: #ffffff;
    border-radius: 5px;
    text-align: center;
    font-weight: bold;
    flex-shrink: 0;
    min-height: fit-content;
}

/* Overlay to hide other content */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: #1f3b57;
    z-index: 999;
    opacity: 0.95;
    display: none;
}

#user-popup {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 350px;
    padding: 20px;
    background-color: #ffffff;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    border-radius: 8px;
    font-family: 'Montserrat', sans-serif;
    display: none;
    z-index: 1000;
    text-align: center;
}

#user-popup h2 {
    margin-bottom: 15px;
    font-size: 22px;
    color: #1f3b57;
}

#username-input {
    width: 90%;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 15px;
}

#register-button {
    background-color: #26ac97;
    color: #ffffff;
    border: none;
    padding: 10px 18px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 15px;
    transition: background-color 0.3s ease;
}

#register-button:hover {
    background-color: #218d78;
}

.popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.popup-content {
    background: #ffffff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    text-align: center;
    width: 350px;
    font-family: 'Montserrat', sans-serif;
}

.popup-content h2 {
    color: #1f3b57;
    margin-bottom: 20px;
    font-size: 20px;
}

.save-comments-button, .cancel-comments-button {
    background-color: #26ac97;
    color: #ffffff;
    border: none;
    padding: 10px 16px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
    margin: 8px 4px;
    transition: background-color 0.3s ease;
}

.cancel-comments-button {
    background-color: #e74c3c;
}

.save-comments-button:hover {
    background-color: #218d78;
}

.cancel-comments-button:hover {
    background-color: #c0392b;
}

.comments-button {
    background-color: #3498db;
    color: #ffffff;
    border: none;
    padding: 7px 13px;
    border-radius: 5px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin: 4px 0;
}

.comments-button:hover {
    background-color: #2c81ba;
    transform: scale(1.05);
}

.comments-button:active {
    background-color: #246a97;
    transform: scale(0.95);
}

.comments-button:focus {
    outline: none;
    box-shadow: 0 0 0 4px rgba(52, 152, 219, 0.4);
}

/* Sort Icons Styling */
.sort-icons {
    display: inline-block;
    margin-left: 6px;
    color: #ffffff;
    font-size: 11px;
    cursor: pointer;
}

.sort-icons i {
    margin-left: 2px;
    transition: color 0.3s ease;
}

.sort-icons i:hover {
    color: #26ac97;
}

.comment-counter {
    margin-right: 8px;
    font-weight: bold;
    font-size: 12px;
}

.view-comments-button {
    background-color: #ddd;
    border: none;
    cursor: pointer;
    padding: 5px;
    border-radius: 3px;
    transition: background-color 0.3s ease;
}

.view-comments-button:hover {
    background-color: #bbb;
}

.view-comments-button i {
    font-size: 14px;
    color: #333;
}

.remove-button, .edit-button {
    border: none;
    border-radius: 5px;
    font-size: 13px;
    cursor: pointer;
    padding: 5px 12px;
    transition: background-color 0.3s ease;
}

.remove-button {
    background-color: #e74c3c;
    color: #ffffff;
    margin-left: 2px;
}

.remove-button:hover {
    background-color: #c0392b;
}

.edit-button {
    background-color: #f39c12;
    color: #ffffff;
    margin-right: 2px;
}

.edit-button:hover {
    background-color: #e67e22;
}

/* Responsive Breakpoints */

/* Ultrawide screens (1920px and above) */
@media (min-width: 1920px) {
    .container {
        max-width: 2560px;
        margin: 0 auto;
    }
    
    .sidebar {
        width: 320px;
        padding: 30px 25px;
    }
    
    .main-content {
        padding: 50px 60px;
    }
    
    .filter-menu {
        gap: 20px;
    }
    
    .bulk-operations {
        gap: 20px;
        padding: 20px;
    }
    
    .group-header {
        padding: 25px 30px;
    }
    
    th, td {
        padding: 12px 15px;
    }
    
    .total-trucks-container {
        padding: 20px;
        margin: 15px 0;
    }
    
    .add-button {
        font-size: 22px;
        padding: 15px 20px;
        margin: 12px 0;
    }
    
    .logout-button, .save-button, .reload-button {
        font-size: 16px;
        padding: 12px 16px;
        margin: 8px 0;
        margin-bottom: 50px;
    }
    
    /* Column widths for ultrawide */
    .year-column { width: 80px; }
    .month-column { width: 80px; }
    .trucks-column { width: 70px; }
    .status-column { width: 110px; }
    .truck-type-column { width: 90px; }
    .phase-in-column { width: 80px; }
}

/* Large desktop screens (1440px to 1919px) */
@media (min-width: 1440px) and (max-width: 1919px) {
    .sidebar {
        width: 290px;
        padding: 25px 20px;
    }
    
    .main-content {
        padding: 40px 50px;
    }
    
    .total-trucks-container {
        padding: 16px;
        margin: 12px 0;
    }
    
    .add-button {
        font-size: 20px;
        padding: 12px 18px;
        margin: 10px 0;
    }
    
    .logout-button, .save-button, .reload-button {
        font-size: 15px;
        padding: 10px 14px;
        margin: 6px 0;
        margin-bottom: 40px;
    }
    
    /* Column widths for large desktop */
    .year-column { width: 70px; }
    .month-column { width: 70px; }
    .trucks-column { width: 65px; }
    .status-column { width: 100px; }
    .truck-type-column { width: 80px; }
    .phase-in-column { width: 70px; }
}

/* Standard desktop screens (1024px to 1439px) */
@media (min-width: 1024px) and (max-width: 1439px) {
    .sidebar {
        width: 270px;
        padding: 20px 18px;
    }
    
    .main-content {
        padding: 30px 40px;
    }
    
    .total-trucks-container {
        padding: 14px;
        margin: 10px 0;
    }
    
    .add-button {
        font-size: 18px;
        padding: 10px 16px;
        margin: 8px 0;
    }
    
    .logout-button, .save-button, .reload-button {
        font-size: 14px;
        padding: 8px 12px;
        margin: 4px 0;
        margin-bottom: 30px;
    }
    
    /* Column widths for standard desktop/laptop */
    .year-column { width: 60px; }
    .month-column { width: 60px; }
    .trucks-column { width: 55px; }
    .status-column { width: 90px; }
    .truck-type-column { width: 70px; }
    .phase-in-column { width: 60px; }
    
    th, td {
        padding: 6px;
        font-size: 12px;
    }
}

/* Tablet screens (768px to 1023px) */
@media (min-width: 768px) and (max-width: 1023px) {
    .container {
        flex-direction: row;
    }
    
    .sidebar {
        width: 250px;
        padding: 20px 15px;
    }
    
    .main-content {
        padding: 20px 30px;
        height: 100vh;
        overflow: hidden;
    }
    
    .filter-menu {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .bulk-operations {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .header {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    table {
        min-width: 700px;
    }
    
    th, td {
        padding: 6px 8px;
        font-size: 11px;
    }
    
    /* Column widths for tablet */
    .select-column { width: 35px; min-width: 35px; }
    .year-column { width: 55px; min-width: 50px; }
    .month-column { width: 55px; min-width: 50px; }
    .trucks-column { width: 50px; min-width: 45px; }
    .status-column { width: 80px; min-width: 75px; }
    .truck-type-column { width: 60px; min-width: 55px; }
    .phase-in-column { width: 55px; min-width: 50px; }
}

/* Mobile screens (320px to 767px) */
@media (max-width: 767px) {
    .container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        height: auto;
        min-height: auto;
        padding: 15px;
        order: 2;
    }
    
    .main-content {
        padding: 15px;
        height: 100vh;
        flex: 1;
        order: 1;
        overflow: hidden;
    }
    
    .header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    h1 {
        font-size: 24px;
    }
    
    .filter-menu {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
        width: 100%;
    }
    
    .filter-select {
        width: 100%;
    }
    
    .bulk-operations {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
        padding: 10px;
    }
    
    .bulk-operations button {
        width: 100%;
    }
    
    .table-container {
        flex: 1;
        min-height: 0;
        overflow-x: auto;
        overflow-y: auto;
    }
    
    table {
        min-width: 600px;
    }
    
    th, td {
        padding: 5px 6px;
        font-size: 10px;
    }
    
    .group-header {
        padding: 10px 15px;
        font-size: 14px;
    }
    
    .group-totals {
        display: block;
        margin-left: 0;
        margin-top: 5px;
        font-size: 11px;
    }
    
    .total-trucks-container {
        margin: 10px 0;
        padding: 15px;
    }
    
    .sidebar-user {
        font-size: 14px;
        padding: 10px;
    }
    
    /* Column widths for mobile */
    .select-column { width: 30px; min-width: 30px; }
    .year-column { width: 45px; min-width: 40px; }
    .month-column { width: 45px; min-width: 40px; }
    .trucks-column { width: 40px; min-width: 35px; }
    .status-column { width: 70px; min-width: 65px; }
    .truck-type-column { width: 50px; min-width: 45px; }
    .phase-in-column { width: 45px; min-width: 40px; }
}

/* Extra small screens (320px and below) */
@media (max-width: 320px) {
    .main-content {
        padding: 10px;
        height: 100vh;
        overflow: hidden;
    }

    h1 {
        font-size: 20px;
    }

    .filter-menu {
        gap: 5px;
    }

    .bulk-operations {
        gap: 5px;
        padding: 8px;
    }
}

/* Data Insights Page Styles */
.back-button-container {
    display: flex;
    justify-content: flex-end;
    width: 100%;
}

.back-button {
    background-color: #6c757d;
    color: #ffffff;
    border: none;
    padding: 8px 16px;
    border-radius: 5px;
    font-size: 14px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    display: flex;
    align-items: center;
    gap: 6px;
}

.back-button:hover {
    background-color: #5a6268;
}

.insights-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    grid-template-rows: 1fr 1fr;
    gap: 15px;
    padding: 15px 0;
    flex: 1;
    overflow-y: auto;
    height: calc(100vh - 150px);
    max-height: calc(100vh - 150px);
    grid-template-areas:
        "trend status"
        "company .";
}

.insight-card {
    background-color: #ffffff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    min-height: 350px;
    max-height: 450px;
}

.insight-card.trend-chart {
    grid-area: trend;
}

.insight-card.status-chart {
    grid-area: status;
}

.insight-card.company-chart {
    grid-area: company;
}

.insight-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.card-header {
    background-color: #1f3b57;
    color: #ffffff;
    padding: 12px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h3 {
    margin: 0;
    font-size: 16px;
    font-weight: 600;
}

.card-header i {
    font-size: 18px;
    opacity: 0.8;
}

.card-content {
    padding: 15px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 250px;
    height: calc(100% - 50px);
}

.placeholder-chart {
    text-align: center;
    color: #6c757d;
}

.placeholder-chart i {
    margin-bottom: 12px;
    color: #3498db;
}

.placeholder-chart p {
    margin: 0;
    font-size: 14px;
    font-weight: 500;
}

/* Active sidebar button styling */
.sidebar-button.active {
    background-color: #3498db;
}

.sidebar-button.active:hover {
    background-color: #2980b9;
}

/* Responsive adjustments for insights grid */
@media (max-width: 768px) {

    .insights-grid {
        grid-template-columns: 1fr;
        grid-template-rows: auto;
        gap: 12px;
        padding: 12px 0;
        height: auto;
        max-height: none;
    }

    .insight-card {
        min-height: 300px;
        max-height: none;
    }

    .card-content {
        padding: 15px;
        min-height: 250px;
        height: auto;
    }

    .card-header h3 {
        font-size: 15px;
    }
}

/* Loading and Error States */
.loading-state {
    text-align: center;
    padding: 40px 20px;
    color: #666;
    font-style: italic;
    background-color: #f8f9fa;
}

.loading-charts {
    text-align: center;
    padding: 40px 20px;
    color: #666;
    font-size: 14px;
    background-color: #f8f9fa;
    border: 2px dashed #dee2e6;
    border-radius: 8px;
    margin: 20px;
}

.error-state {
    text-align: center;
    padding: 40px 20px;
    color: #dc3545;
    background-color: #f8d7da;
    border: 1px solid #f5c6cb;
    border-radius: 5px;
}

.login-required,
.error-message {
    text-align: center;
    padding: 40px 20px;
    color: #666;
    font-size: 16px;
    background-color: #f8f9fa;
    border: 2px dashed #dee2e6;
    border-radius: 8px;
    margin: 20px;
}

.error-message {
    color: #dc3545;
    background-color: #f8d7da;
    border-color: #f5c6cb;
}

/* Loading spinner animation (optional enhancement) */
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid #f3f3f3;
    border-top: 2px solid #1f3b57;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 10px;
}