/**
 * COMPONENTS STYLES
 * ===================================================================
 * Buttons, Forms, Tables, Cards, Modals, Badges
 * ===================================================================
 */

/* ===================================================================
   BUTTONS
   =================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-base);
    font-weight: var(--font-medium);
    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(--radius-md);
    transition: all var(--transition-fast);
}

.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;
    transform: none !important;
}

/* Button Variants */
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--white);
    border-color: var(--primary);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--secondary));
}

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

.btn-success:hover {
    background: #218838;
}

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

.btn-error:hover, .btn-danger:hover {
    background: #c82333;
}

.btn-warning {
    background: var(--warning);
    color: var(--warning-dark);
    border-color: var(--warning);
}

.btn-warning:hover {
    background: #e0a800;
}

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

.btn-info:hover {
    background: #138496;
}

.btn-secondary {
    background: var(--gray-600);
    color: var(--white);
    border-color: var(--gray-600);
}

.btn-secondary:hover {
    background: var(--gray-700);
}

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

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

/* Button Sizes */
.btn-sm {
    padding: 6px 12px;
    font-size: var(--font-sm);
}

.btn-lg {
    padding: 12px 24px;
    font-size: var(--font-lg);
}

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

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

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

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

.form-control {
    display: block;
    width: 100%;
    padding: 12px 16px;
    font-size: var(--font-base);
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--white);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-control:disabled {
    background-color: var(--gray-100);
    cursor: not-allowed;
    opacity: 0.6;
}

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

.form-control.is-invalid:focus {
    box-shadow: 0 0 0 3px var(--error-light);
}

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

.form-control.is-valid:focus {
    box-shadow: 0 0 0 3px var(--success-light);
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

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

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

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

/* Form Row */
.form-row {
    display: flex;
    gap: var(--spacing-md);
}

.form-row .form-group {
    flex: 1;
}

/* Checkbox & Radio */
.form-check {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.form-check-input {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.form-check-label {
    font-weight: var(--font-normal);
    cursor: pointer;
}

/* ===================================================================
   TABLES
   =================================================================== */
.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.table {
    width: 100%;
    border-collapse: collapse;
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.table thead {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--white);
}

.table thead th {
    padding: var(--spacing-md) var(--spacing-md);
    text-align: left;
    font-weight: var(--font-semibold);
    font-size: var(--font-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.table tbody tr {
    border-bottom: 1px solid var(--border-light);
    transition: background var(--transition-fast);
}

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

.table tbody tr:hover {
    background: var(--gray-100);
}

.table tbody td {
    padding: var(--spacing-md);
    font-size: var(--font-sm);
    color: var(--text-primary);
}

.table tbody td.actions {
    white-space: nowrap;
}

.table tbody td.text-center {
    text-align: center;
}

.table tbody td.text-right {
    text-align: right;
}

/* Table Variants */
.table-striped tbody tr:nth-child(odd) {
    background: var(--gray-100);
}

.table-bordered {
    border: 1px solid var(--border-color);
}

.table-bordered th,
.table-bordered td {
    border: 1px solid var(--border-color);
}

/* ===================================================================
   CARDS
   =================================================================== */
.card {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: all var(--transition-base);
}

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

.card-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-light);
    background: var(--gray-100);
}

.card-title {
    font-size: var(--font-xl);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    margin: 0;
}

.card-subtitle {
    font-size: var(--font-sm);
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

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

.card-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-light);
    background: var(--gray-100);
}

/* Card Variants */
.card-primary {
    border-left: 4px solid var(--primary);
}

.card-success {
    border-left: 4px solid var(--success);
}

.card-error, .card-danger {
    border-left: 4px solid var(--error);
}

.card-warning {
    border-left: 4px solid var(--warning);
}

.card-info {
    border-left: 4px solid var(--info);
}

/* ===================================================================
   BADGES
   =================================================================== */
.badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 4px 12px;
    font-size: var(--font-xs);
    font-weight: var(--font-semibold);
    line-height: 1;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

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

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

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

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

.badge-secondary {
    background: var(--gray-600);
    color: var(--white);
}

/* ===================================================================
   MODALS
   =================================================================== */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: var(--z-modal-backdrop);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.modal-backdrop.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    z-index: var(--z-modal);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.modal.active {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, -50%) scale(1);
}

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

.modal-title {
    font-size: var(--font-xl);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: var(--font-2xl);
    color: var(--text-muted);
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--gray-100);
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-lg);
    overflow-y: auto;
    flex: 1;
}

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

/* ===================================================================
   LOADING SPINNER
   =================================================================== */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--white);
    border-radius: var(--radius-full);
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.spinner-primary {
    border-color: rgba(102, 126, 234, 0.3);
    border-top-color: var(--primary);
}

/* ===================================================================
   PAGINATION
   =================================================================== */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    list-style: none;
    margin: var(--spacing-xl) 0;
    padding: 0;
}

.pagination-item {
    display: inline-block;
}

.pagination-link {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 var(--spacing-sm);
    color: var(--text-primary);
    text-decoration: none;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.pagination-link:hover {
    background: var(--gray-100);
    text-decoration: none;
}

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

.pagination-link:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ===================================================================
   EMPTY STATE
   =================================================================== */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-lg);
}

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

.empty-state-title {
    font-size: var(--font-xl);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.empty-state-text {
    font-size: var(--font-base);
    color: var(--text-muted);
    margin-bottom: var(--spacing-lg);
}

/* ===================================================================
   RESPONSIVE - MOBILE
   =================================================================== */
@media (max-width: 768px) {
    .btn {
        padding: 10px 16px;
        font-size: var(--font-sm);
    }

    .form-row {
        flex-direction: column;
    }

    .table {
        font-size: var(--font-xs);
    }

    .table thead th,
    .table tbody td {
        padding: var(--spacing-sm);
    }

    .modal {
        width: 95%;
        max-height: 95vh;
    }

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