/* ===================================
   CSS Variables & Theme
   =================================== */
:root {
    /* Insurance Industry Colors */
    --primary-color: #1e40af;
    --primary-light: #3b82f6;
    --primary-dark: #1e3a8a;
    --secondary-color: #0891b2;
    --accent-color: #f59e0b;
    
    /* Status Colors */
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #3b82f6;
    
    /* Neutral Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    --border-color: #e2e8f0;
    --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);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, monospace;
}

/* ===================================
   Reset & Base Styles
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ===================================
   Header
   =================================== */
.header {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
    color: white;
    padding: var(--spacing-lg) var(--spacing-xl);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo-icon {
    width: 36px;
    height: 36px;
    stroke-width: 2;
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 700;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-sm);
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.nav-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

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

.nav-btn i {
    width: 18px;
    height: 18px;
}

/* ===================================
   Main Content
   =================================== */
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

.view {
    display: none;
    animation: fadeIn 0.4s ease;
}

.view.active {
    display: block;
}

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

/* ===================================
   Page Header
   =================================== */
.page-header {
    margin-bottom: var(--spacing-xl);
}

.page-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.btn-back {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.95rem;
    margin-bottom: var(--spacing-lg);
    transition: all 0.3s ease;
}

.btn-back:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* ===================================
   Stats Grid
   =================================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: var(--bg-primary);
    border-radius: 12px;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    display: flex;
    gap: var(--spacing-lg);
    transition: all 0.3s ease;
}

.stat-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.stat-icon {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.stat-icon.blue {
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    color: white;
}

.stat-icon.orange {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    color: white;
}

.stat-icon.green {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
}

.stat-icon.purple {
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
    color: white;
}

.stat-icon i {
    width: 28px;
    height: 28px;
}

.stat-content h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

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

.stat-change.positive {
    color: var(--success-color);
}

/* ===================================
   Section Card
   =================================== */
.section-card {
    background: var(--bg-primary);
    border-radius: 12px;
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    margin-bottom: var(--spacing-xl);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.section-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* ===================================
   Buttons
   =================================== */
.btn-primary,
.btn-secondary,
.btn-icon {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
}

.btn-icon {
    padding: var(--spacing-sm);
    background: transparent;
    border: 1px solid var(--border-color);
}

.btn-icon:hover {
    background: var(--bg-tertiary);
}

.full-width {
    width: 100%;
    justify-content: center;
}

/* ===================================
   Table
   =================================== */
.table-container {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table thead {
    background: var(--bg-tertiary);
}

.data-table th {
    padding: var(--spacing-md);
    text-align: left;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.data-table td {
    padding: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    font-size: 0.95rem;
}

.data-table tbody tr {
    transition: background 0.2s ease;
}

.data-table tbody tr:hover {
    background: var(--bg-secondary);
}

/* ===================================
   Badges
   =================================== */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.25rem 0.75rem;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
}

.badge-success {
    background: #d1fae5;
    color: #065f46;
}

.badge-warning {
    background: #fef3c7;
    color: #92400e;
}

.badge-danger {
    background: #fee2e2;
    color: #991b1b;
}

.badge-info {
    background: #dbeafe;
    color: #1e40af;
}

.badge-primary {
    background: #e0e7ff;
    color: #3730a3;
}

.status-badge {
    padding: 0.375rem 0.875rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
}

.status-pending {
    background: #fef3c7;
    color: #92400e;
}

.status-review {
    background: #dbeafe;
    color: #1e40af;
}

.status-completed {
    background: #d1fae5;
    color: #065f46;
}

/* ===================================
   Policy Info Grid
   =================================== */
.policy-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: 8px;
}

.info-item label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.info-item p {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
}

.policy-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--primary-color);
    color: white;
    border-radius: 8px;
    font-weight: 600;
}

/* ===================================
   Comparison Grid
   =================================== */
.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.discrepancy-list,
.coverage-items,
.endorsement-list,
.risk-items {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.discrepancy-item,
.coverage-item,
.endorsement-item,
.risk-item {
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: 8px;
    border-left: 4px solid var(--border-color);
    transition: all 0.3s ease;
}

.discrepancy-item {
    border-left-color: var(--warning-color);
}

.coverage-item {
    border-left-color: var(--info-color);
}

.endorsement-item {
    border-left-color: var(--success-color);
}

.risk-item {
    border-left-color: var(--danger-color);
}

.discrepancy-item:hover,
.coverage-item:hover,
.endorsement-item:hover,
.risk-item:hover {
    background: var(--bg-tertiary);
    transform: translateX(4px);
}

.item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.item-title {
    font-weight: 600;
    color: var(--text-primary);
}

.item-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.item-meta {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

/* ===================================
   Action Bar
   =================================== */
.action-bar {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: 8px;
}

/* ===================================
   Letter Container
   =================================== */
.letter-container {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--spacing-xl);
}

.letter-sidebar {
    background: var(--bg-primary);
    border-radius: 12px;
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    height: fit-content;
}

.letter-sidebar h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
}

.option-group {
    margin-bottom: var(--spacing-lg);
}

.option-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.95rem;
    color: var(--text-primary);
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

/* ===================================
   Letter Preview
   =================================== */
.letter-preview {
    background: var(--bg-primary);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.letter-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg) var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.letter-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
}

.letter-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.letter-content {
    padding: var(--spacing-2xl);
    min-height: 600px;
    font-family: var(--font-sans);
    line-height: 1.8;
}

.letter-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 500px;
    color: var(--text-tertiary);
    text-align: center;
}

.letter-placeholder i {
    width: 64px;
    height: 64px;
    margin-bottom: var(--spacing-lg);
    opacity: 0.5;
}

.letter-placeholder p {
    font-size: 1.1rem;
}

/* Letter Formatting */
.letter-date {
    margin-bottom: var(--spacing-xl);
    color: var(--text-secondary);
}

.letter-recipient {
    margin-bottom: var(--spacing-xl);
}

.letter-recipient p {
    margin-bottom: 0.25rem;
}

.letter-subject {
    font-weight: 700;
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-left: 4px solid var(--primary-color);
}

.letter-body {
    margin-bottom: var(--spacing-xl);
}

.letter-body p {
    margin-bottom: var(--spacing-lg);
}

.letter-section {
    margin: var(--spacing-xl) 0;
}

.letter-section h4 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.letter-list {
    list-style: none;
    padding-left: 0;
}

.letter-list li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
}

.letter-list li:before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.letter-signature {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border-color);
}

/* ===================================
   Loading Overlay
   =================================== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    z-index: 1000;
}

.loading-overlay.active {
    display: flex;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-overlay p {
    color: white;
    margin-top: var(--spacing-lg);
    font-size: 1.1rem;
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1024px) {
    .letter-container {
        grid-template-columns: 1fr;
    }
    
    .comparison-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: var(--spacing-lg);
    }
    
    .nav-menu {
        width: 100%;
        justify-content: space-between;
    }
    
    .nav-btn {
        flex: 1;
        justify-content: center;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .main-content {
        padding: var(--spacing-md);
    }
    
    .action-bar {
        flex-direction: column;
    }
    
    .action-bar button {
        width: 100%;
    }
}

/* ===================================
   Print Styles
   =================================== */
@media print {
    .header,
    .nav-menu,
    .btn-back,
    .action-bar,
    .letter-sidebar,
    .letter-header {
        display: none !important;
    }
    
    .letter-preview {
        box-shadow: none;
        border: none;
    }
    
    .letter-content {
        padding: 0;
    }
}