/* ========================================
   Shoptet XML Feed Generator – Stylesheet
   Modern, clean UI with CSS custom properties
   ======================================== */

:root {
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-primary-light: #eff6ff;
    --color-danger: #dc2626;
    --color-danger-hover: #b91c1c;
    --color-danger-light: #fef2f2;
    --color-success: #16a34a;
    --color-success-light: #f0fdf4;
    --color-warning: #f59e0b;
    --color-warning-light: #fffbeb;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;
    --color-white: #ffffff;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 18px;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
    --transition: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas, monospace;
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background: var(--color-gray-50);
    color: var(--color-gray-800);
    line-height: 1.6;
    min-height: 100vh;
}

/* Layout */
.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 2rem 1.5rem 4rem;
}

/* Header */
.app-header {
    text-align: center;
    margin-bottom: 2.5rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--color-gray-200);
}

.app-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-gray-900);
    letter-spacing: -0.025em;
    margin-bottom: 0.375rem;
}

.app-header p {
    font-size: 0.9375rem;
    color: var(--color-gray-500);
}

/* Sections */
.section {
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.section-title {
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.section-title .badge {
    font-size: 0.75rem;
    font-weight: 500;
    background: var(--color-primary-light);
    color: var(--color-primary);
    padding: 0.125rem 0.5rem;
    border-radius: 999px;
}

/* URL Input Group */
.url-list {
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
}

.url-row {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    animation: slideIn 200ms ease-out;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(-8px); }
    to   { opacity: 1; transform: translateY(0); }
}

.url-row input {
    flex: 1;
}

.url-row .status-icon {
    width: 2rem;
    flex-shrink: 0;
    text-align: center;
    font-size: 1.125rem;
    line-height: 2.5rem;
}

.url-row .status-icon.loading {
    color: var(--color-primary);
    animation: spin 1s linear infinite;
}

.url-row .status-icon.success { color: var(--color-success); }
.url-row .status-icon.error   { color: var(--color-danger); }

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

/* Form Elements */
input[type="text"],
input[type="number"],
input[type="url"],
textarea,
select {
    width: 100%;
    padding: 0.5625rem 0.75rem;
    font-family: var(--font-sans);
    font-size: 0.875rem;
    color: var(--color-gray-800);
    background: var(--color-white);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-sm);
    transition: border-color var(--transition), box-shadow var(--transition);
    outline: none;
}

input:focus, textarea:focus, select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

input.is-invalid, textarea.is-invalid {
    border-color: var(--color-danger);
    background: var(--color-danger-light);
}

input.is-invalid:focus {
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.12);
}

textarea {
    resize: vertical;
    min-height: 4.5rem;
}

label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-gray-600);
    margin-bottom: 0.3rem;
}

label .required {
    color: var(--color-danger);
    margin-left: 0.125rem;
}

/* Checkbox */
.checkbox-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.checkbox-row input[type="checkbox"] {
    width: 1rem;
    height: 1rem;
    accent-color: var(--color-primary);
}

.checkbox-row label {
    margin-bottom: 0;
    cursor: pointer;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
    padding: 0.5625rem 1.125rem;
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1.25;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
    user-select: none;
}

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

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

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-hover);
}

.btn-secondary {
    background: var(--color-white);
    color: var(--color-gray-700);
    border-color: var(--color-gray-300);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-gray-50);
    border-color: var(--color-gray-400);
}

.btn-danger {
    background: var(--color-white);
    color: var(--color-danger);
    border-color: var(--color-gray-300);
}

.btn-danger:hover:not(:disabled) {
    background: var(--color-danger-light);
    border-color: var(--color-danger);
}

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

.btn-success:hover:not(:disabled) {
    background: #15803d;
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
}

.btn-icon {
    width: 2.25rem;
    height: 2.25rem;
    padding: 0;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

/* Action Row */
.action-row {
    display: flex;
    gap: 0.625rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

/* Product Cards */
#products-container {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.product-card {
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    animation: fadeIn 300ms ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}

.product-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    background: var(--color-gray-50);
    border-bottom: 1px solid var(--color-gray-200);
}

.product-card-header h3 {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-gray-800);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 70%;
}

.product-card-header .source-url {
    font-size: 0.75rem;
    color: var(--color-gray-400);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 28%;
}

.product-card-body {
    padding: 1.5rem;
}

.product-card .field-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.product-card .field-grid .field-full {
    grid-column: 1 / -1;
}

.product-card .field-group {
    display: flex;
    flex-direction: column;
}

/* Parameters (dynamic key-value pairs) */
.params-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.param-row {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.param-row input {
    flex: 1;
}

/* Variants Table */
.variants-section {
    margin-top: 0.25rem;
}

.variants-table-wrap {
    overflow-x: auto;
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-sm);
}

.variants-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8125rem;
    min-width: 700px;
}

.variants-table thead {
    background: var(--color-gray-50);
}

.variants-table th {
    padding: 0.5rem 0.375rem;
    text-align: left;
    font-weight: 500;
    color: var(--color-gray-600);
    font-size: 0.75rem;
    border-bottom: 1px solid var(--color-gray-200);
    white-space: nowrap;
}

.variants-table td {
    padding: 0.375rem 0.25rem;
    border-bottom: 1px solid var(--color-gray-100);
}

.variants-table td:last-child {
    width: 2.5rem;
    text-align: center;
}

.variants-table input {
    padding: 0.375rem 0.5rem;
    font-size: 0.8125rem;
}

.variants-table input[type="number"] {
    min-width: 5rem;
}

.variant-row:last-child td {
    border-bottom: none;
}

/* Footer Generate Section */
.generate-section {
    position: sticky;
    bottom: 0;
    background: var(--color-white);
    border-top: 1px solid var(--color-gray-200);
    padding: 1.25rem 1.75rem;
    margin: 0 -1.5rem -4rem;
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.06);
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 10;
}

.generate-section .product-count {
    font-size: 0.875rem;
    color: var(--color-gray-500);
}

.generate-section .product-count strong {
    color: var(--color-gray-800);
}

/* Spinner */
.spinner {
    display: inline-block;
    width: 1em;
    height: 1em;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    vertical-align: middle;
}

/* Toast / Alert Messages */
.alert {
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

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

.alert-success {
    background: var(--color-success-light);
    color: var(--color-success);
    border: 1px solid #bbf7d0;
}

.alert-warning {
    background: var(--color-warning-light);
    color: #92400e;
    border: 1px solid #fde68a;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--color-gray-400);
}

.empty-state svg {
    width: 3rem;
    height: 3rem;
    margin-bottom: 1rem;
    opacity: 0.4;
}

.empty-state p {
    font-size: 0.9375rem;
}

/* Modal Overlay */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    padding: 1rem;
    animation: fadeInOverlay 200ms ease-out;
}

@keyframes fadeInOverlay {
    from { opacity: 0; }
    to   { opacity: 1; }
}

.modal-content {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 700px;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideIn 200ms ease-out;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--color-gray-200);
}

.modal-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-gray-900);
}

.modal-body {
    padding: 1.5rem;
}

.modal-hint {
    font-size: 0.875rem;
    color: var(--color-gray-600);
    margin-bottom: 1rem;
    line-height: 1.5;
}

.modal-hint strong {
    color: var(--color-gray-800);
}

.paste-url-box {
    margin-bottom: 0.75rem;
    padding: 0.625rem 0.875rem;
    background: var(--color-gray-50);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-gray-200);
}

.paste-url-link {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--color-primary);
    word-break: break-all;
    text-decoration: underline;
}

.paste-url-link:hover {
    color: var(--color-primary-hover);
}

.modal-body textarea {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    min-height: 14rem;
    resize: vertical;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 0.625rem;
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--color-gray-200);
}

/* Hidden utility */
.hidden { display: none !important; }

/* Responsive */
@media (max-width: 640px) {
    .container {
        padding: 1.25rem 1rem 5rem;
    }

    .product-card .field-grid {
        grid-template-columns: 1fr;
    }

    .product-card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.25rem;
    }

    .product-card-header h3,
    .product-card-header .source-url {
        max-width: 100%;
    }

    .generate-section {
        flex-direction: column;
        gap: 0.75rem;
        text-align: center;
    }

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

    .action-row .btn {
        width: 100%;
    }
}