/* ============================================
   Bulk URL Status & Redirect Checker - Modern SaaS UI
   Public Access Version - Fixed AJAX/JS
   ============================================ */

:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-gradient: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    --warning-gradient: linear-gradient(135deg, #f6d365 0%, #fda085 100%);
    --error-gradient: linear-gradient(135deg, #ff416c 0%, #ff4b2b 100%);
    --dark-bg: #0f172a;
    --card-bg: #ffffff;
    --code-bg: #f8fafc;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-code: #334155;
    --border-color: #e2e8f0;
    --status-200: #10b981;
    --status-301: #f59e0b;
    --status-302: #f59e0b;
    --status-404: #ef4444;
    --status-500: #dc2626;
    --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
   ============================================ */

.busc-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
   ============================================ */

.busc-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);
}

.busc-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;
}

.busc-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);
}

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

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

.busc-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);
}

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

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

.busc-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);
}

.busc-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;
}

.busc-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;
}

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

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

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

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

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

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

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

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

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

.busc-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;
}

.busc-textarea {
    width: 100%;
    min-height: 200px;
    padding: 1.25rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: 'JetBrains Mono', 'Consolas', monospace;
    font-size: 0.875rem;
    line-height: 1.7;
    resize: vertical;
    transition: var(--transition);
    background: var(--code-bg);
    color: var(--text-code);
}

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

.busc-textarea::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

.busc-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);
}

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

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

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

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

.busc-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;
}

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

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

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

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

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

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

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

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

/* ============================================
   Stats Dashboard
   ============================================ */

.busc-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.busc-stat-card {
    background: var(--code-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    text-align: center;
    transition: var(--transition);
}

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

.busc-stat-value {
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: 0.25rem;
}

.busc-stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.busc-stat-total { color: var(--text-primary); }
.busc-stat-success { color: var(--status-200); }
.busc-stat-redirect { color: var(--status-301); }
.busc-stat-error { color: var(--status-404); }

/* ============================================
   Results Table
   ============================================ */

.busc-results-container {
    margin-top: 2rem;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.busc-results-container.show {
    opacity: 1;
    transform: translateY(0);
}

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

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

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

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

.busc-table td {
    padding: 0.875rem 1rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    vertical-align: middle;
}

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

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

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

/* Status Code Badges */
.busc-status {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.375rem 0.875rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 600;
}

.busc-status-200 { background: #d1fae5; color: #065f46; }
.busc-status-301,
.busc-status-302 { background: #fef3c7; color: #92400e; }
.busc-status-404 { background: #fee2e2; color: #991b1b; }
.busc-status-500,
.busc-status-502,
.busc-status-503 { background: #fecaca; color: #7f1d1d; }
.busc-status-error { background: #f3f4f6; color: #374151; }

[data-theme="dark"] .busc-status-200 { background: rgba(16, 185, 129, 0.2); color: #6ee7b7; }
[data-theme="dark"] .busc-status-301,
[data-theme="dark"] .busc-status-302 { background: rgba(245, 158, 11, 0.2); color: #fcd34d; }
[data-theme="dark"] .busc-status-404 { background: rgba(239, 68, 68, 0.2); color: #fca5a5; }

.busc-url-cell {
    max-width: 400px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8125rem;
}

.busc-redirect-chain {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

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

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

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

.busc-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); }
}

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

.busc-progress.active {
    display: block;
}

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

/* ============================================
   Alert Messages
   ============================================ */

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

.busc-alert.active {
    display: flex;
}

.busc-alert-error {
    background: #fef2f2;
    border-left: 4px solid var(--status-404);
    color: #991b1b;
}

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

.busc-alert-warning {
    background: #fffbeb;
    border-left: 4px solid var(--status-301);
    color: #92400e;
}

.busc-alert-success {
    background: #f0fdf4;
    border-left: 4px solid var(--status-200);
    color: #166534;
}

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

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

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

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

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

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

.busc-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);
}

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

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

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

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

/* ============================================
   Empty State
   ============================================ */

.busc-empty-state {
    text-align: center;
    padding: 4rem 2rem;
}

.busc-empty-state-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

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

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

.busc-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;
}

.busc-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;
}

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

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

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

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

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

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

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

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

.busc-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);
}

.busc-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);
}

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

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

/* Comparison Table */
.busc-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);
}

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

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

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

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

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

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

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

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

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

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

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

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

@media (max-width: 768px) {
    .busc-container {
        padding: 1rem;
    }
    
    .busc-header {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .busc-header h2 {
        font-size: 1.75rem;
    }
    
    .busc-tabs {
        flex-direction: column;
    }
    
    .busc-grid-2, .busc-grid-3 {
        grid-template-columns: 1fr;
    }
    
    .busc-stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .busc-url-cell {
        max-width: 200px;
    }
    
    .busc-seo-content h1 {
        font-size: 1.875rem;
    }
    
    .busc-seo-content h2 {
        font-size: 1.5rem;
    }
}

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

.busc-table-wrapper::-webkit-scrollbar,
.busc-textarea::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

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

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

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