/* CSS Variables for theming */
:root {
    /* Light theme colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    --accent-primary: #3b82f6;
    --accent-hover: #2563eb;
    --accent-light: #dbeafe;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

/* Dark theme colors */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --border-hover: #475569;
    --accent-primary: #60a5fa;
    --accent-hover: #3b82f6;
    --accent-light: #1e3a8a;
    --success-color: #34d399;
    --error-color: #f87171;
    --warning-color: #fbbf24;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3), 0 2px 4px -2px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.3), 0 4px 6px -4px rgb(0 0 0 / 0.3);
}

/* Base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

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

/* Header */
.header {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--accent-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.theme-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.5rem;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
}

.theme-btn:hover {
    background: var(--accent-light);
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

.requests-counter {
    font-size: 0.875rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

/* Main content */
.main-content {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
    width: 100%;
}

/* Accordion sections */
.accordion-section {
    margin-bottom: 2rem;
}

.accordion-card {
    background: var(--bg-primary);
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.accordion-header {
    padding: 1.5rem 2rem;
    cursor: pointer;
    transition: all 0.3s ease;
    border-bottom: 1px solid transparent;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.accordion-header:hover {
    background: var(--bg-secondary);
}

.accordion-header.active {
    border-bottom-color: var(--border-color);
}

.accordion-title {
    margin: 0;
}

.accordion-title h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.accordion-title p {
    color: var(--text-secondary);
    margin: 0;
    font-size: 0.9rem;
}

.accordion-toggle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    transition: transform 0.3s ease;
}

.accordion-toggle.active {
    transform: rotate(180deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.accordion-content.active {
    max-height: 2000px;
}

.accordion-inner {
    padding: 0 2rem 2rem 2rem;
}

/* Samples section */
.samples-section {
    margin-bottom: 2rem;
}

.samples-card {
    background: var(--bg-primary);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

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

.samples-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.samples-header p {
    color: var(--text-secondary);
}

.samples-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
    max-width: 100%;
}

.sample-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

.sample-item:hover {
    border-color: var(--accent-primary);
    background: var(--accent-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.sample-item.processing {
    opacity: 0.7;
    cursor: not-allowed;
}

.sample-title {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.sample-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.4;
}

.sample-filename {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    background: var(--bg-tertiary);
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    display: inline-block;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    cursor: help;
    transition: all 0.2s ease;
}

.sample-filename:hover {
    background: var(--accent-light);
    color: var(--accent-primary);
    transform: scale(1.02);
}

.sample-badge {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    background: var(--accent-primary);
    color: white;
    font-size: 0.625rem;
    padding: 0.25rem 0.5rem;
    border-radius: 1rem;
    font-weight: 500;
}

/* Upload section */
.upload-section {
    margin-bottom: 2rem;
}

.upload-card {
    background: var(--bg-primary);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

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

.upload-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.upload-header p {
    color: var(--text-secondary);
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 0.75rem;
    padding: 3rem 2rem;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--accent-primary);
    background: var(--accent-light);
}

.upload-content h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.upload-icon {
    font-size: 3rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.browse-link {
    color: var(--accent-primary);
    cursor: pointer;
    text-decoration: underline;
}

.file-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem;
    background: var(--accent-light);
    border-radius: 0.5rem;
    margin: 1rem 0;
}

.remove-btn {
    background: var(--error-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 1.5rem;
    height: 1.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.upload-options {
    margin: 1.5rem 0;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.875rem;
}

.upload-btn {
    width: 100%;
    background: var(--accent-primary);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.upload-btn:hover:not(:disabled) {
    background: var(--accent-hover);
}

.upload-btn:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
}

/* Results section */
.results-card {
    background: var(--bg-primary);
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.results-header {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.results-controls {
    display: flex;
    gap: 0.5rem;
}

.download-btn,
.clear-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.5rem;
    border-radius: 0.375rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.clear-btn:hover {
    background: var(--error-color);
    color: white;
}

/* Tabs */
.tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    flex: 1;
    background: none;
    border: none;
    padding: 1rem 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    border-bottom: 2px solid transparent;
}

.tab-btn.active {
    color: var(--accent-primary);
    border-bottom-color: var(--accent-primary);
    background: var(--accent-light);
}

.tab-content {
    padding: 2rem;
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

.content-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.content-meta {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.content-area {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 1.5rem;
    min-height: 200px;
    white-space: pre-wrap;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    overflow-x: auto;
}

/* Summary view styles */
.summary-view {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 0;
    min-height: 200px;
    overflow: hidden;
}

.summary-section {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.summary-section:last-child {
    border-bottom: none;
}

.summary-section h4 {
    margin: 0 0 1rem 0;
    color: var(--accent-primary);
    font-size: 1.1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.summary-section p {
    margin: 0;
    line-height: 1.6;
    color: var(--text-primary);
}

.summary-badges {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 0.5rem;
}

.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.badge.sale-yes {
    background: var(--success-color);
    color: white;
}

.badge.sale-no {
    background: var(--text-muted);
    color: white;
}

.badge.dnc-yes {
    background: var(--warning-color);
    color: white;
}

.badge.dnc-no {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.badge.flagged-yes {
    background: var(--error-color);
    color: white;
}

.badge.flagged-no {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.action-items {
    list-style: none;
    padding: 0;
    margin: 0;
}

.action-items li {
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    border-left: 4px solid var(--accent-primary);
}

.action-items li:last-child {
    margin-bottom: 0;
}

/* Loading overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-content {
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: 1rem;
    text-align: center;
    max-width: 400px;
    width: 90%;
}

.loading-spinner {
    width: 3rem;
    height: 3rem;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-steps {
    margin-top: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.step {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem;
    border-radius: 0.375rem;
    background: var(--bg-secondary);
    color: var(--text-secondary);
}

.step.active {
    background: var(--accent-light);
    color: var(--accent-primary);
}

/* Toast notifications */
.toast {
    position: fixed;
    top: 1rem;
    right: 1rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 1rem;
    box-shadow: var(--shadow-lg);
    z-index: 1001;
    display: flex;
    align-items: center;
    gap: 1rem;
    max-width: 400px;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.error-toast {
    border-left: 4px solid var(--error-color);
}

.success-toast {
    border-left: 4px solid var(--success-color);
}

.toast-content {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex: 1;
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem;
}

/* Written By section */
.written-by {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    text-align: center;
}

.written-by-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.written-by h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.written-by p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
}

.author-name {
    color: var(--accent-primary);
    font-weight: 500;
}

/* Footer */
.footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: 1.5rem 0;
    margin-top: auto;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    text-align: center;
}

.footer-links {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color 0.2s ease;
}

.footer-link:hover {
    color: var(--accent-primary);
}

/* Responsive design */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .main-content {
        padding: 1rem;
    }
    
    .upload-card,
    .results-card {
        padding: 1rem;
    }
    
    .tab-content {
        padding: 1rem;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}