/**
 * Patent Intelligence - Stylesheet
 * Color Scheme: White background, Black text, Minimal green (#E2EFDA - Excel light green)
 */

/* CSS Variables */
:root {
    --color-white: #FFFFFF;
    --color-black: #1A1A1A;
    --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-green-light: #E2EFDA;
    --color-green-border: #C6E0B4;
    --color-green-dark: #548235;
    --color-error: #DC2626;
    --color-error-light: #FEE2E2;
    --color-primary: #548235;
    --color-warning: #D97706;

    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', monospace;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

    --radius-sm: 4px;
    --radius: 6px;
    --radius-lg: 8px;

    --transition: 150ms ease;
}

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

/* Base */
html {
    font-size: 14px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-white);
    color: var(--color-black);
    line-height: 1.5;
    min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.25;
    color: var(--color-black);
}

h1 { font-size: 1.875rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.125rem; }

p { margin-bottom: 1rem; }

a {
    color: var(--color-black);
    text-decoration: none;
}

/* Layout */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.page-wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Login Page */
.login-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background-color: var(--color-gray-50);
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 2rem;
}

.login-box {
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    box-shadow: var(--shadow-lg);
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-header h1 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.login-header p {
    color: var(--color-gray-500);
    margin-bottom: 0;
}

/* Forms */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--color-gray-700);
}

.form-input {
    width: 100%;
    padding: 0.625rem 0.875rem;
    font-size: 1rem;
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius);
    background-color: var(--color-white);
    color: var(--color-black);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-gray-400);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.05);
}

.form-input::placeholder {
    color: var(--color-gray-400);
}

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

.form-input.error {
    border-color: var(--color-error);
}

.form-error {
    color: var(--color-error);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid transparent;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--color-gray-700);
    border-color: var(--color-gray-700);
}

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

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

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

.btn-success:hover:not(:disabled) {
    background-color: #3D6125;
}

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

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

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

.btn-block {
    width: 100%;
}

/* Alert Messages */
.alert {
    padding: 0.875rem 1rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

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

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

/* Header */
.header {
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-gray-200);
    padding: 0.875rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.header-brand {
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--color-black);
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.header-nav a {
    color: var(--color-gray-600);
    font-weight: 500;
    transition: color var(--transition);
}

.header-nav a:hover,
.header-nav a.active {
    color: var(--color-black);
}

.header-user {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.header-user-name {
    color: var(--color-gray-600);
    font-size: 0.875rem;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 1.5rem 0;
}

/* Page Header */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}

.page-title {
    font-size: 1.5rem;
    font-weight: 600;
}

/* Cards */
.card {
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.card-header {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--color-gray-200);
    font-weight: 600;
}

.card-body {
    padding: 1.25rem;
}

/* Tables */
.table-wrapper {
    overflow-x: auto;
}

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.table th,
.table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--color-gray-200);
}

.table th {
    font-weight: 600;
    background-color: var(--color-gray-50);
    color: var(--color-gray-700);
    white-space: nowrap;
}

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

.table tbody tr.selected {
    background-color: var(--color-green-light);
}

/* Status Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.625rem;
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: 9999px;
}

.badge-success {
    background-color: var(--color-green-light);
    color: var(--color-green-dark);
}

.badge-warning {
    background-color: #FEF3C7;
    color: #92400E;
}

.badge-error {
    background-color: var(--color-error-light);
    color: var(--color-error);
}

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

/* File Upload */
.upload-zone {
    border: 2px dashed var(--color-gray-300);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition);
}

.upload-zone:hover {
    border-color: var(--color-gray-400);
    background-color: var(--color-gray-50);
}

.upload-zone.dragover {
    border-color: var(--color-green-dark);
    background-color: var(--color-green-light);
}

.upload-zone-icon {
    font-size: 2.5rem;
    color: var(--color-gray-400);
    margin-bottom: 0.75rem;
}

.upload-zone-text {
    color: var(--color-gray-600);
    margin-bottom: 0.5rem;
}

.upload-zone-hint {
    color: var(--color-gray-400);
    font-size: 0.8125rem;
}

/* Document List */
.document-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.document-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
}

.document-item:hover {
    border-color: var(--color-gray-300);
    box-shadow: var(--shadow-sm);
}

.document-item.active {
    border-color: var(--color-black);
    background-color: var(--color-gray-50);
}

.document-info {
    flex: 1;
}

.document-name {
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.document-meta {
    font-size: 0.8125rem;
    color: var(--color-gray-500);
}

/* Fixed Layout for Document Viewer */
.viewer-wrapper {
    display: flex;
    flex-direction: column;
    height: calc(100vh - 120px);
}

.viewer-header {
    flex-shrink: 0;
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-gray-200);
}

.viewer-body {
    flex: 1;
    overflow: hidden;
    display: flex;
}

.viewer-footer {
    flex-shrink: 0;
    padding: 1rem;
    background-color: var(--color-white);
    border-top: 1px solid var(--color-gray-200);
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
}

/* Data Grid */
.data-grid-container {
    flex: 1;
    overflow: hidden;
    position: relative;
}

.data-grid {
    display: flex;
    height: 100%;
}

.data-grid-frozen {
    flex-shrink: 0;
    border-right: 2px solid var(--color-gray-300);
    background-color: var(--color-white);
    z-index: 10;
    overflow-y: auto;
}

.data-grid-scrollable {
    flex: 1;
    overflow: auto;
}

.data-grid table {
    border-collapse: collapse;
    font-size: 0.8125rem;
}

.data-grid th,
.data-grid td {
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--color-gray-200);
    white-space: nowrap;
}

.data-grid th {
    background-color: var(--color-gray-100);
    font-weight: 600;
    position: sticky;
    top: 0;
    z-index: 5;
}

.data-grid-frozen th {
    background-color: var(--color-green-light);
}

.data-grid tbody tr:nth-child(even) {
    background-color: var(--color-gray-50);
}

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

/* Column Actions */
.column-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.column-delete {
    opacity: 0;
    color: var(--color-gray-400);
    cursor: pointer;
    transition: opacity var(--transition);
}

.data-grid th:hover .column-delete {
    opacity: 1;
}

.column-delete:hover {
    color: var(--color-error);
}

/* Add Column Button */
.add-column-btn {
    background: none;
    border: 1px dashed var(--color-gray-300);
    padding: 0.5rem 1rem;
    cursor: pointer;
    color: var(--color-gray-500);
    font-size: 0.8125rem;
    transition: all var(--transition);
}

.add-column-btn:hover {
    border-color: var(--color-gray-400);
    color: var(--color-black);
}

/* SMILES Display */
.smiles-cell {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Footer Actions */
.footer-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-info {
    color: var(--color-gray-500);
    font-size: 0.875rem;
}

/* Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), visibility var(--transition);
}

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

.modal {
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow: hidden;
    transform: scale(0.95);
    transition: transform var(--transition);
}

.modal-overlay.active .modal {
    transform: scale(1);
}

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

.modal-title {
    font-weight: 600;
    font-size: 1.125rem;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--color-gray-400);
    cursor: pointer;
    line-height: 1;
}

.modal-close:hover {
    color: var(--color-black);
}

.modal-body {
    padding: 1.25rem;
    overflow-y: auto;
}

.modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--color-gray-200);
}

/* Loading */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.spinner {
    width: 24px;
    height: 24px;
    border: 2px solid var(--color-gray-200);
    border-top-color: var(--color-black);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.spinner-small {
    width: 12px;
    height: 12px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Utilities */
.hidden { display: none !important; }
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--color-gray-500); }
.text-error { color: var(--color-error); }
.text-success { color: var(--color-green-dark); }
.font-mono { font-family: var(--font-mono); }
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 0.75rem; }
.mt-4 { margin-top: 1rem; }
.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 0.75rem; }
.mb-4 { margin-bottom: 1rem; }
.mr-2 { margin-right: 0.5rem; }
.ml-2 { margin-left: 0.5rem; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }

    .header-nav {
        gap: 1rem;
    }

    .login-container {
        padding: 1rem;
    }

    .login-box {
        padding: 1.5rem;
    }
}