/* =============================================
   SchoolTools Survey - Component Styles
   Buttons, cards, forms, tables, badges, modals
   ============================================= */

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 0.625rem 1.25rem;
    font-size: var(--text-sm);
    font-weight: 500;
    line-height: 1;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
    color: var(--text);
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
    text-decoration: none;
}

.btn:hover {
    background: var(--gray-50);
    border-color: var(--gray-300);
    text-decoration: none;
}

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

.btn-primary {
    background: var(--primary-500);
    color: #fff;
    border-color: var(--primary-500);
}
.btn-primary:hover {
    background: var(--primary-600);
    border-color: var(--primary-600);
}

.btn-danger {
    background: var(--danger);
    color: #fff;
    border-color: var(--danger);
}
.btn-danger:hover {
    background: #dc2626;
    border-color: #dc2626;
}

.btn-success {
    background: var(--success);
    color: #fff;
    border-color: var(--success);
}
.btn-success:hover {
    background: #16a34a;
}

.btn-outline {
    background: transparent;
    border-color: var(--primary-500);
    color: var(--primary-500);
}
.btn-outline:hover {
    background: var(--primary-50);
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: var(--text-xs);
}

.btn-lg {
    padding: 0.875rem 1.75rem;
    font-size: var(--text-base);
}

.btn-icon {
    padding: 0.5rem;
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: var(--radius-sm);
}
.btn-icon:hover {
    background: var(--gray-100);
    color: var(--text);
}

/* --- Cards --- */
.card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.card-body {
    padding: var(--space-4);
}

.card-title {
    font-size: var(--text-lg);
    font-weight: 600;
    margin-bottom: var(--space-2);
}

.card-text {
    color: var(--text-muted);
    font-size: var(--text-sm);
}

.card-footer {
    padding: var(--space-3) var(--space-4);
    border-top: 1px solid var(--border);
    background: var(--bg-alt);
}

/* --- Forms --- */
.form-group {
    margin-bottom: var(--space-4);
}

.form-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text);
    margin-bottom: var(--space-1);
}

.form-label .required {
    color: var(--danger);
    margin-left: 2px;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 0.625rem 0.75rem;
    font-size: var(--text-base);
    font-family: var(--font-sans);
    line-height: 1.5;
    color: var(--text);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: border-color var(--transition), box-shadow var(--transition);
    appearance: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px var(--primary-100);
}

.form-input:disabled,
.form-select:disabled {
    background: var(--gray-100);
    color: var(--text-muted);
    cursor: not-allowed;
}

.form-input.error,
.form-select.error {
    border-color: var(--danger);
}
.form-input.error:focus {
    box-shadow: 0 0 0 3px var(--danger-light);
}

.form-select {
    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='%236b7280' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2.5rem;
}

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

.form-hint {
    display: block;
    font-size: var(--text-xs);
    color: var(--text-muted);
    margin-top: var(--space-1);
}

.form-error {
    display: block;
    font-size: var(--text-xs);
    color: var(--danger);
    margin-top: var(--space-1);
}

.form-check {
    display: flex;
    align-items: flex-start;
    gap: var(--space-2);
    margin-bottom: var(--space-2);
}

.form-check input[type="checkbox"],
.form-check input[type="radio"] {
    margin-top: 0.25rem;
    accent-color: var(--primary-500);
    width: 1.125rem;
    height: 1.125rem;
    flex-shrink: 0;
}

.form-check label {
    font-size: var(--text-base);
    cursor: pointer;
    line-height: 1.5;
}

.form-row {
    display: flex;
    gap: var(--space-4);
}

.form-row > * {
    flex: 1;
}

@media (max-width: 767px) {
    .form-row {
        flex-direction: column;
        gap: 0;
    }
}

/* --- Toggle switch --- */
.toggle {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    cursor: pointer;
}

.toggle input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    width: 44px;
    height: 24px;
    background: var(--gray-300);
    border-radius: var(--radius-full);
    transition: background var(--transition);
    position: relative;
    flex-shrink: 0;
}

.toggle-slider::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    transition: transform var(--transition);
    box-shadow: var(--shadow-sm);
}

.toggle input:checked + .toggle-slider {
    background: var(--primary-500);
}

.toggle input:checked + .toggle-slider::after {
    transform: translateX(20px);
}

/* --- Tables --- */
.table-container {
    width: 100%;
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--text-sm);
}

.table thead {
    background: var(--bg-alt);
    border-bottom: 1px solid var(--border);
}

.table th {
    padding: var(--space-3) var(--space-4);
    text-align: left;
    font-weight: 600;
    color: var(--text-muted);
    font-size: var(--text-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.table th.sortable {
    cursor: pointer;
    user-select: none;
}

.table th.sortable:hover {
    color: var(--text);
}

.table th .sort-icon {
    margin-left: var(--space-1);
    opacity: 0.4;
}

.table th.sort-asc .sort-icon,
.table th.sort-desc .sort-icon {
    opacity: 1;
}

.table td {
    padding: var(--space-3) var(--space-4);
    border-top: 1px solid var(--border);
    vertical-align: middle;
}

.table tbody tr:hover {
    background: var(--gray-50);
}

.table .checkbox-col {
    width: 40px;
}

.table .actions-col {
    width: 120px;
    text-align: right;
}

/* Mobile: tables become cards */
@media (max-width: 767px) {
    .table-responsive thead {
        display: none;
    }

    .table-responsive tr {
        display: block;
        margin-bottom: var(--space-3);
        border: 1px solid var(--border);
        border-radius: var(--radius);
        background: var(--bg);
    }

    .table-responsive td {
        display: flex;
        justify-content: space-between;
        padding: var(--space-2) var(--space-3);
        border-top: none;
        border-bottom: 1px solid var(--gray-100);
    }

    .table-responsive td:last-child {
        border-bottom: none;
    }

    .table-responsive td::before {
        content: attr(data-label);
        font-weight: 600;
        font-size: var(--text-xs);
        color: var(--text-muted);
        text-transform: uppercase;
    }
}

/* --- Badges / Pills --- */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.125rem 0.5rem;
    font-size: var(--text-xs);
    font-weight: 500;
    border-radius: var(--radius-full);
    white-space: nowrap;
}

.badge-draft {
    background: var(--gray-100);
    color: var(--gray-600);
}

.badge-active {
    background: var(--success-light);
    color: #15803d;
}

.badge-closed {
    background: var(--warning-light);
    color: #92400e;
}

.badge-archived {
    background: var(--gray-100);
    color: var(--gray-500);
}

.badge-pro {
    background: linear-gradient(135deg, #8b5cf6, #6366f1);
    color: #fff;
    font-weight: 600;
}

/* --- Table Filters --- */
.table-filters {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    padding: var(--space-4);
    border-bottom: 1px solid var(--border);
    background: var(--bg);
}

.table-filters .form-input,
.table-filters .form-select {
    width: auto;
    min-width: 160px;
    padding: 0.375rem 0.75rem;
    font-size: var(--text-sm);
}

@media (max-width: 767px) {
    .table-filters {
        flex-direction: column;
    }
    .table-filters .form-input,
    .table-filters .form-select {
        width: 100%;
    }
}

/* --- Modal --- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--space-4);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
}

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

.modal {
    background: var(--bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 560px;
    max-height: 90vh;
    overflow-y: auto;
    transform: translateY(10px);
    transition: transform var(--transition);
}

.modal-overlay.active .modal {
    transform: translateY(0);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-6);
    border-bottom: 1px solid var(--border);
}

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

.modal-body {
    padding: var(--space-6);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--border);
    background: var(--bg-alt);
}

/* --- Alert / Message --- */
.alert {
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius);
    font-size: var(--text-sm);
    margin-bottom: var(--space-4);
}

.alert-success {
    background: var(--success-light);
    color: #15803d;
    border: 1px solid #86efac;
}

.alert-error {
    background: var(--danger-light);
    color: #991b1b;
    border: 1px solid #fca5a5;
}

.alert-warning {
    background: var(--warning-light);
    color: #92400e;
    border: 1px solid #fcd34d;
}

.alert-info {
    background: var(--info-light);
    color: #1e40af;
    border: 1px solid #93c5fd;
}

/* --- Empty State --- */
.empty-state {
    text-align: center;
    padding: var(--space-12) var(--space-4);
    color: var(--text-muted);
}

.empty-state .icon {
    font-size: 3rem;
    margin-bottom: var(--space-4);
    opacity: 0.5;
}

.empty-state h3 {
    color: var(--text-muted);
    margin-bottom: var(--space-2);
}

.empty-state p {
    max-width: 400px;
    margin: 0 auto var(--space-4);
}

/* --- Loading Spinner --- */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--gray-200);
    border-top-color: var(--primary-500);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

/* --- Tooltip --- */
[data-tooltip] {
    position: relative;
}

[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    padding: var(--space-1) var(--space-2);
    background: var(--gray-800);
    color: #fff;
    font-size: var(--text-xs);
    border-radius: var(--radius-sm);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition);
}

[data-tooltip]:hover::after {
    opacity: 1;
}

/* --- Progress Bar --- */
.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: var(--primary-500);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}