/**
 * BizInsight Analytics Platform - Main Stylesheet
 * Modern, clean dashboard styling
 */

/* CSS Variables */
:root {
    /* Colors */
    --primary: #4F46E5;
    --primary-dark: #4338CA;
    --primary-light: #818CF8;
    --secondary: #64748B;
    --success: #10B981;
    --warning: #F59E0B;
    --danger: #EF4444;
    --info: #3B82F6;

    /* Neutrals */
    --white: #FFFFFF;
    --gray-50: #F8FAFC;
    --gray-100: #F1F5F9;
    --gray-200: #E2E8F0;
    --gray-300: #CBD5E1;
    --gray-400: #94A3B8;
    --gray-500: #64748B;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1E293B;
    --gray-900: #0F172A;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

/* Dark Mode */
[data-theme="dark"] {
    --gray-50: #0F172A;
    --gray-100: #1E293B;
    --gray-200: #334155;
    --gray-300: #475569;
    --gray-400: #64748B;
    --gray-500: #94A3B8;
    --gray-600: #CBD5E1;
    --gray-700: #E2E8F0;
    --gray-800: #F1F5F9;
    --gray-900: #F8FAFC;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    color: var(--gray-800);
    background-color: var(--gray-50);
    line-height: 1.5;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.25;
    color: var(--gray-900);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.125rem; }
h5 { font-size: 1rem; }
h6 { font-size: 0.875rem; }

p { margin-bottom: var(--spacing-md); }

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-dark);
}

/* Layout */
.app-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background: var(--white);
    border-right: 1px solid var(--gray-200);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
    transition: transform var(--transition-normal);
}

.sidebar-collapsed {
    transform: translateX(-100%);
}

.sidebar-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--gray-200);
}

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

.sidebar-logo svg {
    width: 32px;
    height: 32px;
    color: var(--primary);
}

.sidebar-logo span {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
}

.sidebar-nav {
    flex: 1;
    padding: var(--spacing-md);
    overflow-y: auto;
}

.nav-section {
    margin-bottom: var(--spacing-lg);
}

.nav-section-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--gray-400);
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-xs);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    color: var(--gray-600);
    font-weight: 500;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.nav-item:hover {
    background: var(--gray-100);
    color: var(--gray-900);
}

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

.nav-item svg {
    width: 20px;
    height: 20px;
}

.nav-item-badge {
    margin-left: auto;
    background: var(--danger);
    color: var(--white);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: var(--radius-full);
}

.sidebar-footer {
    padding: var(--spacing-md);
    border-top: 1px solid var(--gray-200);
}

.user-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.user-menu:hover {
    background: var(--gray-100);
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: var(--primary);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
}

.user-info {
    flex: 1;
    min-width: 0;
}

.user-name {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--gray-900);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-role {
    font-size: 0.75rem;
    color: var(--gray-500);
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 260px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.main-header {
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    padding: var(--spacing-md) var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 50;
}

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

.menu-toggle {
    display: none;
    padding: var(--spacing-sm);
    border: none;
    background: none;
    cursor: pointer;
    color: var(--gray-600);
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--gray-500);
}

.breadcrumb a {
    color: var(--gray-500);
}

.breadcrumb-separator {
    color: var(--gray-300);
}

.breadcrumb-current {
    color: var(--gray-900);
    font-weight: 500;
}

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

.header-search {
    position: relative;
}

.header-search input {
    width: 280px;
    padding: var(--spacing-sm) var(--spacing-md);
    padding-left: 40px;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    transition: all var(--transition-fast);
}

.header-search input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.header-search svg {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    color: var(--gray-400);
}

.header-icon-btn {
    position: relative;
    padding: var(--spacing-sm);
    border: none;
    background: none;
    cursor: pointer;
    color: var(--gray-600);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.header-icon-btn:hover {
    background: var(--gray-100);
    color: var(--gray-900);
}

.header-icon-btn .badge {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 8px;
    height: 8px;
    background: var(--danger);
    border-radius: var(--radius-full);
}

.page-content {
    flex: 1;
    padding: var(--spacing-xl);
}

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

.card-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-900);
}

.card-body {
    padding: var(--spacing-lg);
}

.card-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--gray-200);
    background: var(--gray-50);
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

/* KPI Cards */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.kpi-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    transition: all var(--transition-fast);
}

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

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

.kpi-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.kpi-icon.blue { background: rgba(59, 130, 246, 0.1); color: #3B82F6; }
.kpi-icon.green { background: rgba(16, 185, 129, 0.1); color: #10B981; }
.kpi-icon.amber { background: rgba(245, 158, 11, 0.1); color: #F59E0B; }
.kpi-icon.purple { background: rgba(139, 92, 246, 0.1); color: #8B5CF6; }
.kpi-icon.red { background: rgba(239, 68, 68, 0.1); color: #EF4444; }
.kpi-icon.teal { background: rgba(20, 184, 166, 0.1); color: #14B8A6; }
.kpi-icon.indigo { background: rgba(79, 70, 229, 0.1); color: #4F46E5; }
.kpi-icon.emerald { background: rgba(16, 185, 129, 0.1); color: #10B981; }

.kpi-change {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.75rem;
    font-weight: 600;
}

.kpi-change.positive { color: var(--success); }
.kpi-change.negative { color: var(--danger); }

.kpi-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--gray-900);
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

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

/* Charts */
.chart-container {
    position: relative;
    height: 300px;
}

.chart-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.chart-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
}

.chart-card.full-width {
    grid-column: span 2;
}

/* Data Tables */
.data-table {
    width: 100%;
    border-collapse: collapse;
}

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

.data-table th {
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--gray-500);
    background: var(--gray-50);
}

.data-table tbody tr {
    transition: background var(--transition-fast);
}

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

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

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 500;
}

.badge-primary { background: rgba(79, 70, 229, 0.1); color: var(--primary); }
.badge-success { background: rgba(16, 185, 129, 0.1); color: var(--success); }
.badge-warning { background: rgba(245, 158, 11, 0.1); color: var(--warning); }
.badge-danger { background: rgba(239, 68, 68, 0.1); color: var(--danger); }
.badge-info { background: rgba(59, 130, 246, 0.1); color: var(--info); }
.badge-secondary { background: var(--gray-100); color: var(--gray-600); }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-secondary {
    background: var(--gray-100);
    color: var(--gray-700);
}

.btn-secondary:hover {
    background: var(--gray-200);
}

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

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

.btn-outline {
    background: transparent;
    border: 1px solid var(--gray-300);
    color: var(--gray-700);
}

.btn-outline:hover {
    background: var(--gray-100);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1rem;
}

.btn-icon {
    padding: var(--spacing-sm);
}

/* Forms */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: var(--spacing-xs);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    transition: all var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-textarea {
    min-height: 100px;
    resize: vertical;
}

/* Filters */
.filter-bar {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.filter-group label {
    font-size: 0.875rem;
    color: var(--gray-600);
    font-weight: 500;
}

/* Date Range Picker */
.date-range-picker {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: var(--white);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    padding: var(--spacing-xs);
}

.date-range-picker input {
    border: none;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.875rem;
    width: 120px;
}

.date-range-picker input:focus {
    outline: none;
}

.date-range-separator {
    color: var(--gray-400);
}

/* Pagination */
.pagination {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
}

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

.pagination-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.pagination-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--gray-300);
    background: var(--white);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.pagination-btn:hover:not(:disabled) {
    background: var(--gray-100);
}

.pagination-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.stat-card {
    text-align: center;
    padding: var(--spacing-lg);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-900);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray-500);
    margin-top: var(--spacing-xs);
}

.stat-change {
    font-size: 0.75rem;
    margin-top: var(--spacing-sm);
}

/* Funnel Chart */
.funnel-chart {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

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

.funnel-bar {
    height: 40px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--primary-light) 100%);
    border-radius: var(--radius-md);
    transition: width var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: var(--spacing-md);
    color: var(--white);
    font-weight: 600;
    font-size: 0.875rem;
    min-width: 60px;
}

.funnel-label {
    min-width: 100px;
    font-size: 0.875rem;
    color: var(--gray-700);
}

.funnel-percentage {
    min-width: 60px;
    font-size: 0.75rem;
    color: var(--gray-500);
}

/* Loading States */
.loading-spinner {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.skeleton {
    background: linear-gradient(90deg, var(--gray-200) 25%, var(--gray-100) 50%, var(--gray-200) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-md);
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Empty States */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--gray-500);
}

.empty-state svg {
    width: 64px;
    height: 64px;
    color: var(--gray-300);
    margin-bottom: var(--spacing-md);
}

.empty-state h3 {
    color: var(--gray-700);
    margin-bottom: var(--spacing-sm);
}

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

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

.modal {
    background: var(--white);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow: hidden;
    transform: scale(0.9);
    transition: transform var(--transition-normal);
}

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

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

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

.modal-close {
    padding: var(--spacing-sm);
    border: none;
    background: none;
    cursor: pointer;
    color: var(--gray-500);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--gray-100);
    color: var(--gray-700);
}

.modal-body {
    padding: var(--spacing-lg);
    overflow-y: auto;
    max-height: calc(90vh - 140px);
}

.modal-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--gray-200);
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
}

/* Responsive */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
    }

    .menu-toggle {
        display: block;
    }

    .chart-grid {
        grid-template-columns: 1fr;
    }

    .chart-card.full-width {
        grid-column: span 1;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .header-search {
        display: none;
    }

    .kpi-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .filter-bar {
        flex-direction: column;
        align-items: stretch;
    }

    .filter-group {
        flex-wrap: wrap;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .data-table {
        font-size: 0.875rem;
    }

    .data-table th,
    .data-table td {
        padding: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .kpi-grid {
        grid-template-columns: 1fr;
    }

    .page-content {
        padding: var(--spacing-md);
    }
}

/* Print Styles */
@media print {
    .sidebar,
    .main-header,
    .filter-bar {
        display: none;
    }

    .main-content {
        margin-left: 0;
    }

    .card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}