/**
 * Reusable UI Components
 */

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 12px 24px;
    font-size: var(--font-size-base);
    font-weight: 500;
    line-height: 1.5;
    text-align: center;
    text-decoration: none;
    white-space: nowrap;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    border: 1px solid transparent;
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
    min-height: 48px; /* Touch-friendly */
}

.btn:hover {
    text-decoration: none;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn:active {
    transform: translateY(0);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
    color: var(--white);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: var(--white);
    border-color: var(--secondary-color);
}

.btn-success {
    background-color: var(--success-color);
    color: var(--white);
    border-color: var(--success-color);
}

.btn-danger {
    background-color: var(--danger-color);
    color: var(--white);
    border-color: var(--danger-color);
}

.btn-outline-primary {
    background-color: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-outline-primary:hover {
    background-color: var(--primary-color);
    color: var(--white);
}

.btn-sm {
    padding: 8px 16px;
    font-size: var(--font-size-sm);
    min-height: 36px;
}

.btn-lg {
    padding: 16px 32px;
    font-size: var(--font-size-lg);
    min-height: 56px;
}

.btn-block {
    display: block;
    width: 100%;
}

/* ===== Cards ===== */
.card {
    background-color: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
}

.card-header {
    padding: var(--spacing-md);
    background-color: var(--light-gray);
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
}

.card-body {
    padding: var(--spacing-md);
}

.card-footer {
    padding: var(--spacing-md);
    background-color: var(--light-gray);
    border-top: 1px solid var(--border-color);
}

.card-title {
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.card-text {
    margin-bottom: var(--spacing-md);
}

/* ===== Forms ===== */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--text-primary);
}

.form-label.required::after {
    content: " *";
    color: var(--danger-color);
}

.form-control {
    display: block;
    width: 100%;
    padding: 12px 16px;
    font-size: 16px; /* Prevents iOS zoom */
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--white);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: border-color var(--transition-fast);
    min-height: 48px; /* Touch-friendly */
}

.form-control:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

.form-control:disabled {
    background-color: var(--light-gray);
    cursor: not-allowed;
}

.form-control.is-invalid {
    border-color: var(--danger-color);
}

.form-control.is-valid {
    border-color: var(--success-color);
}

textarea.form-control {
    min-height: 120px;
    resize: vertical;
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23333' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 40px;
}

.form-check {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    min-height: 24px;
}

.form-check-input {
    width: 20px;
    height: 20px;
    margin-right: var(--spacing-sm);
    cursor: pointer;
}

.form-check-label {
    cursor: pointer;
    user-select: none;
}

.form-text {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.invalid-feedback {
    display: none;
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--danger-color);
}

.form-control.is-invalid ~ .invalid-feedback {
    display: block;
}

.valid-feedback {
    display: none;
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--success-color);
}

.form-control.is-valid ~ .valid-feedback {
    display: block;
}

/* ===== Alerts ===== */
.alert {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border: 1px solid transparent;
    border-radius: var(--border-radius);
}

.alert-success {
    background-color: #d4edda;
    border-color: #c3e6cb;
    color: #155724;
}

.alert-danger {
    background-color: #f8d7da;
    border-color: #f5c6cb;
    color: #721c24;
}

.alert-warning {
    background-color: #fff3cd;
    border-color: #ffeaa7;
    color: #856404;
}

.alert-info {
    background-color: #d1ecf1;
    border-color: #bee5eb;
    color: #0c5460;
}

.alert-dismissible {
    position: relative;
    padding-right: 48px;
}

.alert-dismissible .close {
    position: absolute;
    top: 0;
    right: 0;
    padding: var(--spacing-md);
    background: none;
    border: none;
    font-size: 24px;
    line-height: 1;
    cursor: pointer;
    opacity: 0.5;
}

.alert-dismissible .close:hover {
    opacity: 1;
}

/* ===== Badges ===== */
.badge {
    display: inline-block;
    padding: 4px 8px;
    font-size: var(--font-size-sm);
    font-weight: 600;
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
    border-radius: var(--border-radius-sm);
}

.badge-primary {
    background-color: var(--primary-color);
    color: var(--white);
}

.badge-secondary {
    background-color: var(--secondary-color);
    color: var(--white);
}

.badge-success {
    background-color: var(--success-color);
    color: var(--white);
}

.badge-danger {
    background-color: var(--danger-color);
    color: var(--white);
}

.badge-warning {
    background-color: var(--warning-color);
    color: var(--black);
}

.badge-info {
    background-color: var(--info-color);
    color: var(--white);
}

/* ===== Modal ===== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    overflow-y: auto;
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-dialog {
    position: relative;
    width: 90%;
    max-width: 600px;
    margin: var(--spacing-md);
}

.modal-content {
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.modal-title {
    margin: 0;
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 28px;
    line-height: 1;
    cursor: pointer;
    opacity: 0.5;
    padding: 0;
    width: 32px;
    height: 32px;
}

.modal-close:hover {
    opacity: 1;
}

.modal-body {
    padding: var(--spacing-md);
}

.modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

/* ===== Tables ===== */
.table {
    width: 100%;
    margin-bottom: var(--spacing-md);
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.table thead th {
    font-weight: 600;
    background-color: var(--light-gray);
    border-bottom: 2px solid var(--border-color);
}

.table tbody tr:hover {
    background-color: var(--light-gray);
}

.table-striped tbody tr:nth-child(odd) {
    background-color: var(--bg-secondary);
}

/* Mobile: Convert table to cards */
@media (max-width: 767px) {
    .table-responsive {
        display: block;
    }
    
    .table-responsive thead {
        display: none;
    }
    
    .table-responsive tbody,
    .table-responsive tr,
    .table-responsive td {
        display: block;
        width: 100%;
    }
    
    .table-responsive tr {
        margin-bottom: var(--spacing-md);
        border: 1px solid var(--border-color);
        border-radius: var(--border-radius);
        padding: var(--spacing-md);
        background-color: var(--white);
    }
    
    .table-responsive td {
        border: none;
        padding: var(--spacing-sm) 0;
        position: relative;
        padding-left: 50%;
    }
    
    .table-responsive td::before {
        content: attr(data-label);
        position: absolute;
        left: 0;
        width: 45%;
        padding-right: var(--spacing-sm);
        font-weight: 600;
        text-align: left;
    }
}

/* ===== Pagination ===== */
.pagination {
    display: flex;
    list-style: none;
    gap: var(--spacing-xs);
    margin: var(--spacing-md) 0;
}

.pagination li {
    display: inline-block;
}

.pagination a,
.pagination span {
    display: block;
    padding: 8px 12px;
    min-width: 44px;
    text-align: center;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--primary-color);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.pagination a:hover {
    background-color: var(--light-gray);
    text-decoration: none;
}

.pagination .active span {
    background-color: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

.pagination .disabled span {
    color: var(--text-muted);
    cursor: not-allowed;
    pointer-events: none;
}

/* ===== Breadcrumb ===== */
.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    padding: var(--spacing-md) 0;
    margin-bottom: var(--spacing-md);
}

.breadcrumb-item {
    display: flex;
    align-items: center;
}

.breadcrumb-item + .breadcrumb-item::before {
    content: "/";
    padding: 0 var(--spacing-sm);
    color: var(--text-muted);
}

.breadcrumb-item.active {
    color: var(--text-muted);
}

/* ===== Tabs ===== */
.nav-tabs {
    display: flex;
    list-style: none;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: var(--spacing-md);
    overflow-x: auto;
}

.nav-tabs li {
    margin-bottom: -2px;
}

.nav-tabs a {
    display: block;
    padding: 12px 24px;
    color: var(--text-secondary);
    text-decoration: none;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.nav-tabs a:hover {
    color: var(--primary-color);
    text-decoration: none;
}

.nav-tabs a.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-content {
    padding: var(--spacing-md) 0;
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

/* ===== Tooltips ===== */
.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip .tooltiptext {
    visibility: hidden;
    width: 200px;
    background-color: var(--black);
    color: var(--white);
    text-align: center;
    border-radius: var(--border-radius-sm);
    padding: 8px;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -100px;
    opacity: 0;
    transition: opacity var(--transition-fast);
    font-size: var(--font-size-sm);
}

.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
}

/* ===== Progress Bar ===== */
.progress {
    height: 24px;
    background-color: var(--light-gray);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background-color: var(--primary-color);
    transition: width var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

/* ===== App Layout ===== */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.main-content {
    flex: 1;
    padding: var(--spacing-lg);
    max-width: var(--max-width);
    margin: 0 auto;
    width: 100%;
}

@media (max-width: 767px) {
    .main-content {
        padding: var(--spacing-md);
    }
}

/* ===== Header ===== */
.app-header {
    background-color: var(--white);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    max-width: var(--max-width);
    margin: 0 auto;
}

.app-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
    margin: 0;
}

.user-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-name {
    font-weight: 500;
    color: var(--text-primary);
}

@media (max-width: 767px) {
    .header-content {
        padding: var(--spacing-md);
    }
    
    .app-title {
        font-size: var(--font-size-lg);
    }
    
    .user-name {
        display: none;
    }
}

/* ===== Navigation ===== */
.main-nav {
    background-color: var(--white);
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.main-nav::-webkit-scrollbar {
    height: 4px;
}

.main-nav::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 2px;
}

.main-nav {
    display: flex;
    gap: var(--spacing-xs);
    padding: 0 var(--spacing-lg);
    max-width: var(--max-width);
    margin: 0 auto;
}

.nav-link {
    display: block;
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    white-space: nowrap;
    border-bottom: 3px solid transparent;
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--primary-color);
    background-color: var(--light-gray);
    text-decoration: none;
}

.nav-link.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

@media (max-width: 767px) {
    .main-nav {
        padding: 0 var(--spacing-md);
    }
    
    .nav-link {
        padding: var(--spacing-md);
        font-size: var(--font-size-sm);
    }
}

/* ===== Page Header ===== */
.page-header {
    margin-bottom: var(--spacing-xl);
}

.page-header h2 {
    font-size: var(--font-size-xxl);
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

@media (max-width: 767px) {
    .page-header h2 {
        font-size: var(--font-size-xl);
    }
}

/* ===== Stats Grid ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background-color: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
}

.stat-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.stat-icon {
    font-size: 48px;
    line-height: 1;
}

.stat-content {
    flex: 1;
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.stat-value {
    font-size: var(--font-size-xxl);
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

@media (max-width: 767px) {
    .stats-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .stat-card {
        padding: var(--spacing-md);
    }
    
    .stat-icon {
        font-size: 36px;
    }
    
    .stat-value {
        font-size: var(--font-size-xl);
    }
}

/* ===== Section ===== */
.section {
    margin-bottom: var(--spacing-xl);
}

.section h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
}

/* ===== Quick Actions ===== */
.quick-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.action-card {
    background-color: var(--white);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    text-align: center;
    text-decoration: none;
    transition: all var(--transition-fast);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.action-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    text-decoration: none;
}

.action-icon {
    font-size: 48px;
    line-height: 1;
}

.action-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.action-description {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin: 0;
}

@media (max-width: 767px) {
    .quick-actions {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }
    
    .action-card {
        padding: var(--spacing-md);
    }
    
    .action-icon {
        font-size: 36px;
    }
    
    .action-title {
        font-size: var(--font-size-base);
    }
    
    .action-description {
        font-size: 12px;
    }
}

/* ===== Activity Items ===== */
.activity-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    transition: background-color var(--transition-fast);
}

.activity-item:last-child {
    border-bottom: none;
}

.activity-item:hover {
    background-color: var(--light-gray);
}

.activity-icon {
    font-size: 32px;
    line-height: 1;
    flex-shrink: 0;
}

.activity-details {
    flex: 1;
    min-width: 0;
}

.activity-description {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.activity-meta {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.activity-amount {
    font-size: var(--font-size-lg);
    font-weight: 600;
    flex-shrink: 0;
}

.activity-amount.income {
    color: var(--success-color);
}

.activity-amount.expense {
    color: var(--danger-color);
}

@media (max-width: 767px) {
    .activity-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .activity-amount {
        align-self: flex-end;
    }
}

/* ===== Data Tables ===== */
.table-container {
    overflow-x: auto;
    margin-bottom: var(--spacing-md);
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--white);
}

.data-table thead {
    background-color: var(--light-gray);
    border-bottom: 2px solid var(--border-color);
}

.data-table th {
    padding: 12px 16px;
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
}

.data-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}

.data-table tbody tr:hover {
    background-color: var(--light-gray);
}

.data-table .text-right {
    text-align: right;
}

.data-table .actions-cell {
    white-space: nowrap;
}

.data-table .actions-cell .btn {
    margin-right: var(--spacing-xs);
}

.data-table .actions-cell .btn:last-child {
    margin-right: 0;
}

.data-table tfoot {
    background-color: var(--light-gray);
    border-top: 2px solid var(--border-color);
}

.data-table .total-row td {
    font-weight: 600;
    padding: 16px;
}

/* ===== Summary Bar ===== */
.summary-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
}

.summary-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.summary-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
}

.summary-value {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--text-primary);
}

.summary-bar .btn {
    margin-left: auto;
}

@media (max-width: 767px) {
    .summary-bar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .summary-item {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }
    
    .summary-bar .btn {
        margin-left: 0;
        width: 100%;
    }
}

/* ===== Filters ===== */
.filters-card {
    margin-bottom: var(--spacing-lg);
}

.filters-card .card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.filters-card .card-header h3 {
    margin: 0;
    font-size: var(--font-size-lg);
}

.filters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.filters-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
}

@media (max-width: 767px) {
    .filters-grid {
        grid-template-columns: 1fr;
    }
    
    .filters-actions {
        flex-direction: column;
    }
    
    .filters-actions .btn {
        width: 100%;
    }
}

/* ===== Page Header with Actions ===== */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.page-header h2 {
    margin: 0;
}

.header-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

@media (max-width: 767px) {
    .page-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .page-header .btn {
        width: 100%;
    }
}

/* ===== Form Input Aliases ===== */
.form-input {
    display: block;
    width: 100%;
    padding: 12px 16px;
    font-size: 16px;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--white);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: border-color var(--transition-fast);
    min-height: 48px;
}

.form-input:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

.form-input:disabled {
    background-color: var(--light-gray);
    cursor: not-allowed;
}

select.form-input {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23333' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 40px;
}

/* ===== Empty State ===== */
.empty-state {
    text-align: center;
    padding: var(--spacing-xxl) var(--spacing-md);
    color: var(--text-muted);
    font-size: var(--font-size-lg);
}

.empty-icon {
    font-size: 64px;
    margin-bottom: var(--spacing-md);
}

.empty-state h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.empty-state p {
    margin-bottom: var(--spacing-lg);
    color: var(--text-secondary);
}

.error-message {
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--danger-color);
    background-color: #f8d7da;
    border: 1px solid #f5c6cb;
    border-radius: var(--border-radius);
}

.loading {
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--text-muted);
}

/* ===== Footer ===== */
.app-footer {
    background-color: var(--white);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-lg);
    text-align: center;
    margin-top: auto;
}

.app-footer p {
    margin: 0;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

@media (max-width: 767px) {
    .app-footer {
        padding: var(--spacing-md);
    }
}

/* ===== Tabs (Simple) ===== */
.tabs {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--border-color);
    overflow-x: auto;
}

.tab {
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    white-space: nowrap;
    border-bottom: 3px solid transparent;
    margin-bottom: -2px;
    transition: all var(--transition-fast);
}

.tab:hover {
    color: var(--primary-color);
    text-decoration: none;
}

.tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

@media (max-width: 767px) {
    .tabs {
        gap: 0;
    }
    
    .tab {
        padding: var(--spacing-md);
        font-size: var(--font-size-sm);
    }
}

/* ===== Documents Grid ===== */
.documents-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.document-card {
    background-color: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
}

.document-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.document-thumbnail {
    font-size: 48px;
    text-align: center;
    padding: var(--spacing-md);
    background-color: var(--light-gray);
    border-radius: var(--border-radius);
}

.document-details {
    flex: 1;
}

.document-name {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.document-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    flex-wrap: wrap;
}

.document-date {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.document-description {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.document-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
}

.linked-badge {
    display: inline-block;
    padding: 4px 8px;
    font-size: var(--font-size-sm);
    background-color: var(--light-gray);
    border-radius: var(--border-radius-sm);
    color: var(--text-secondary);
}

.document-actions {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.document-actions .btn {
    flex: 1;
    min-width: 80px;
}

@media (max-width: 767px) {
    .documents-grid {
        grid-template-columns: 1fr;
    }
    
    .document-actions {
        flex-direction: column;
    }
    
    .document-actions .btn {
        width: 100%;
    }
}