/* ============================================
   Advanced CSV Parser & Analyzer - Modern SaaS UI
   Public Access Version
   ============================================ */

:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --warning-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    --dark-bg: #0f172a;
    --card-bg: #ffffff;
    --code-bg: #f8fafc;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-code: #334155;
    --border-color: #e2e8f0;
    --error-color: #ef4444;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --card-bg: #1e293b;
    --code-bg: #0f172a;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-code: #e2e8f0;
    --border-color: #334155;
}

/* ============================================
   Base Styles
   ============================================ */

.acp-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-primary);
    line-height: 1.6;
}

/* ============================================
   Header & Theme Toggle
   ============================================ */

.acp-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
}

.acp-header h2 {
    font-size: 2.25rem;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.025em;
}

.acp-theme-toggle {
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 0.625rem 1.25rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

.acp-theme-toggle:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: #667eea;
}

/* ============================================
   Card Components
   ============================================ */

.acp-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: 2rem;
    margin-bottom: 2rem;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.acp-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

/* ============================================
   Tabs
   ============================================ */

.acp-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    background: var(--code-bg);
    padding: 0.5rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.acp-tab {
    flex: 1;
    padding: 0.875rem 1.5rem;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
    font-size: 0.9375rem;
    position: relative;
    overflow: hidden;
}

.acp-tab::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--primary-gradient);
    opacity: 0;
    transition: opacity 0.3s;
    z-index: 0;
}

.acp-tab span {
    position: relative;
    z-index: 1;
}

.acp-tab.active {
    color: white;
    box-shadow: var(--shadow-md);
}

.acp-tab.active::before {
    opacity: 1;
}

.acp-tab:hover:not(.active) {
    color: var(--text-primary);
    background: rgba(102, 126, 234, 0.1);
}

.acp-tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.acp-tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ============================================
   File Upload Area
   ============================================ */

.acp-upload-area {
    border: 3px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 3rem 2rem;
    text-align: center;
    transition: var(--transition);
    background: var(--code-bg);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.acp-upload-area:hover {
    border-color: #667eea;
    background: rgba(102, 126, 234, 0.05);
}

.acp-upload-area.dragover {
    border-color: #667eea;
    background: rgba(102, 126, 234, 0.1);
    transform: scale(1.02);
}

.acp-upload-area input[type="file"] {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.acp-upload-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.acp-upload-text {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.acp-upload-hint {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.acp-file-selected {
    display: none;
    padding: 1rem;
    background: rgba(16, 185, 129, 0.1);
    border: 2px solid var(--success-color);
    border-radius: var(--radius-md);
    margin-top: 1rem;
    align-items: center;
    gap: 1rem;
}

.acp-file-selected.show {
    display: flex;
}

.acp-file-info {
    flex: 1;
    text-align: left;
}

.acp-file-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.acp-file-size {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* ============================================
   Form Elements
   ============================================ */

.acp-input-group {
    margin-bottom: 1.5rem;
}

.acp-input-group label {
    display: block;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.acp-select {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    background: var(--card-bg);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
}

.acp-select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.acp-grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.acp-grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

/* ============================================
   Button Styles
   ============================================ */

.acp-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    font-size: 0.9375rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.025em;
    position: relative;
    overflow: hidden;
}

.acp-btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.acp-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.5);
}

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

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

.acp-btn-outline {
    background: transparent;
    border: 2px solid var(--border-color);
    color: var(--text-primary);
}

.acp-btn-outline:hover {
    border-color: #667eea;
    color: #667eea;
    background: rgba(102, 126, 234, 0.05);
}

.acp-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

.acp-btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* ============================================
   Table Styles
   ============================================ */

.acp-table-container {
    overflow-x: auto;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    max-height: 600px;
    overflow-y: auto;
    position: relative;
}

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

.acp-table thead {
    position: sticky;
    top: 0;
    z-index: 10;
}

.acp-table th {
    background: var(--primary-gradient);
    color: white;
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    white-space: nowrap;
}

.acp-table td {
    padding: 0.875rem 1rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.acp-table tr:hover td {
    background: rgba(102, 126, 234, 0.05);
}

.acp-table tr:nth-child(even) {
    background: rgba(0, 0, 0, 0.02);
}

[data-theme="dark"] .acp-table tr:nth-child(even) {
    background: rgba(255, 255, 255, 0.02);
}

/* Cell type indicators */
.acp-cell-number {
    text-align: right;
    font-family: 'JetBrains Mono', monospace;
}

.acp-cell-string {
    text-align: left;
}

.acp-cell-empty {
    color: var(--text-secondary);
    font-style: italic;
}

/* ============================================
   Analysis Dashboard
   ============================================ */

.acp-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.acp-stat-card {
    background: var(--code-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    text-align: center;
    transition: var(--transition);
}

.acp-stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: #667eea;
}

.acp-stat-icon {
    font-size: 2rem;
    margin-bottom: 0.75rem;
    display: block;
}

.acp-stat-value {
    font-size: 2rem;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.25rem;
}

.acp-stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ============================================
   Analysis Report
   ============================================ */

.acp-report-section {
    margin-bottom: 2rem;
}

.acp-report-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

.acp-report-content {
    background: var(--code-bg);
    border-radius: var(--radius-md);
    padding: 1.5rem;
}

.acp-column-analysis {
    display: grid;
    gap: 1rem;
}

.acp-column-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 1rem;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
    gap: 1rem;
    align-items: center;
    font-size: 0.875rem;
}

.acp-column-name {
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.acp-column-type {
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-align: center;
    text-transform: uppercase;
}

.acp-type-string { background: #dbeafe; color: #1e40af; }
.acp-type-number { background: #d1fae5; color: #065f46; }
.acp-type-date { background: #fef3c7; color: #92400e; }
.acp-type-mixed { background: #fce7f3; color: #9d174d; }
.acp-type-empty { background: #f3f4f6; color: #374151; }

[data-theme="dark"] .acp-type-string { background: rgba(59, 130, 246, 0.2); color: #93c5fd; }
[data-theme="dark"] .acp-type-number { background: rgba(16, 185, 129, 0.2); color: #6ee7b7; }
[data-theme="dark"] .acp-type-date { background: rgba(245, 158, 11, 0.2); color: #fcd34d; }
[data-theme="dark"] .acp-type-mixed { background: rgba(236, 72, 153, 0.2); color: #f9a8d4; }

/* ============================================
   Error & Warning Messages
   ============================================ */

.acp-alert {
    padding: 1.25rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
    display: none;
    align-items: flex-start;
    gap: 0.875rem;
}

.acp-alert.show {
    display: flex;
}

.acp-alert-error {
    background: #fef2f2;
    border-left: 4px solid var(--error-color);
    color: #991b1b;
}

[data-theme="dark"] .acp-alert-error {
    background: rgba(239, 68, 68, 0.1);
    color: #fca5a5;
}

.acp-alert-warning {
    background: #fffbeb;
    border-left: 4px solid var(--warning-color);
    color: #92400e;
}

.acp-alert-success {
    background: #f0fdf4;
    border-left: 4px solid var(--success-color);
    color: #166534;
}

.acp-alert-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
}

.acp-alert-content {
    flex: 1;
}

.acp-alert-title {
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.acp-alert-message {
    font-size: 0.9375rem;
    line-height: 1.5;
}

/* ============================================
   Loading & Progress
   ============================================ */

.acp-loading {
    display: none;
    text-align: center;
    padding: 3rem;
}

.acp-loading.active {
    display: block;
}

.acp-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--border-color);
    border-top-color: #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

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

.acp-progress {
    width: 100%;
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    margin: 1rem 0;
    display: none;
}

.acp-progress.show {
    display: block;
}

.acp-progress-bar {
    height: 100%;
    background: var(--primary-gradient);
    width: 0%;
    transition: width 0.3s ease;
}

/* ============================================
   Validation Report
   ============================================ */

.acp-validation-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.acp-validation-item {
    padding: 0.875rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9375rem;
}

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

.acp-validation-error {
    color: var(--error-color);
}

.acp-validation-warning {
    color: var(--warning-color);
}

.acp-validation-info {
    color: var(--info-color);
}

/* ============================================
   Export Options
   ============================================ */

.acp-export-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.acp-export-card {
    background: var(--code-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
}

.acp-export-card:hover {
    border-color: #667eea;
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.acp-export-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    display: block;
}

.acp-export-title {
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.acp-export-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* ============================================
   SEO Content Section
   ============================================ */

.acp-seo-content {
    margin-top: 4rem;
    padding-top: 3rem;
    border-top: 3px solid var(--border-color);
}

.acp-seo-content h1 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.2;
}

.acp-seo-content h2 {
    font-size: 1.875rem;
    margin-top: 3rem;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
    position: relative;
    padding-left: 1.25rem;
    font-weight: 700;
}

.acp-seo-content h2::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.25rem;
    bottom: 0.25rem;
    width: 4px;
    background: var(--primary-gradient);
    border-radius: 2px;
}

.acp-seo-content h3 {
    font-size: 1.375rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-weight: 600;
}

.acp-seo-content p {
    line-height: 1.8;
    margin-bottom: 1.25rem;
    color: var(--text-secondary);
    font-size: 1.0625rem;
}

.acp-seo-content ul, .acp-seo-content ol {
    margin-bottom: 1.5rem;
    padding-left: 1.75rem;
}

.acp-seo-content li {
    margin-bottom: 0.875rem;
    line-height: 1.7;
    color: var(--text-secondary);
    font-size: 1.025rem;
}

.acp-seo-content strong {
    color: var(--text-primary);
    font-weight: 600;
}

.acp-seo-content a {
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
    border-bottom: 2px solid transparent;
    transition: border-color 0.3s;
}

.acp-seo-content a:hover {
    border-bottom-color: #667eea;
}

.acp-seo-content code {
    background: var(--code-bg);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9em;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.acp-faq-item {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    padding: 1.75rem;
    margin-bottom: 1.25rem;
    border-left: 4px solid #667eea;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.acp-faq-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.acp-faq-item h3 {
    font-size: 1.25rem;
    margin-bottom: 0.875rem;
    color: var(--text-primary);
    margin-top: 0;
}

/* Comparison Table */
.acp-comparison-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: 2rem 0;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.acp-comparison-table th {
    background: var(--primary-gradient);
    color: white;
    padding: 1.25rem;
    text-align: left;
    font-weight: 700;
    font-size: 0.9375rem;
}

.acp-comparison-table td {
    padding: 1.25rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--card-bg);
    color: var(--text-secondary);
}

.acp-comparison-table tr:last-child td {
    border-bottom: none;
}

.acp-comparison-table tr:hover td {
    background: rgba(102, 126, 234, 0.03);
}

/* Schema markup hidden */
.acp-schema {
    display: none;
}

/* ============================================
   Utility Classes
   ============================================ */

.acp-hidden {
    display: none !important;
}

.acp-flex {
    display: flex;
    gap: 1rem;
}

.acp-text-center {
    text-align: center;
}

.acp-mb-0 {
    margin-bottom: 0;
}

.acp-mt-2 {
    margin-top: 2rem;
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 768px) {
    .acp-container {
        padding: 1rem;
    }
    
    .acp-header {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .acp-header h2 {
        font-size: 1.75rem;
    }
    
    .acp-tabs {
        flex-direction: column;
    }
    
    .acp-grid-2, .acp-grid-3 {
        grid-template-columns: 1fr;
    }
    
    .acp-column-item {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }
    
    .acp-stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .acp-seo-content h1 {
        font-size: 1.875rem;
    }
    
    .acp-seo-content h2 {
        font-size: 1.5rem;
    }
}

/* ============================================
   Scrollbar Styling
   ============================================ */

.acp-table-container::-webkit-scrollbar,
.acp-textarea::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

.acp-table-container::-webkit-scrollbar-track,
.acp-textarea::-webkit-scrollbar-track {
    background: var(--border-color);
    border-radius: 5px;
}

.acp-table-container::-webkit-scrollbar-thumb,
.acp-textarea::-webkit-scrollbar-thumb {
    background: #667eea;
    border-radius: 5px;
}

.acp-table-container::-webkit-scrollbar-thumb:hover,
.acp-textarea::-webkit-scrollbar-thumb:hover {
    background: #5a67d8;
}