/* ===== RESET & BASE ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Primary Colors */
    --primary-50: #eef2ff;
    --primary-100: #e0e7ff;
    --primary-200: #c7d2fe;
    --primary-300: #a5b4fc;
    --primary-400: #818cf8;
    --primary-500: #6366f1;
    --primary-600: #4f46e5;
    --primary-700: #4338ca;
    --primary-800: #3730a3;
    --primary-900: #312e81;
    
    /* Neutral Colors */
    --neutral-50: #f8fafc;
    --neutral-100: #f1f5f9;
    --neutral-200: #e2e8f0;
    --neutral-300: #cbd5e1;
    --neutral-400: #94a3b8;
    --neutral-500: #64748b;
    --neutral-600: #475569;
    --neutral-700: #334155;
    --neutral-800: #1e293b;
    --neutral-900: #0f172a;
    
    /* Semantic Colors */
    --success-500: #22c55e;
    --success-600: #16a34a;
    --error-500: #ef4444;
    --error-600: #dc2626;
    --warning-500: #eab308;
    
    /* Light Theme Defaults */
    --bg-primary: #ffffff;
    --bg-secondary: var(--neutral-50);
    --bg-tertiary: var(--neutral-100);
    --bg-hover: var(--neutral-200);
    --text-primary: var(--neutral-900);
    --text-secondary: var(--neutral-700);
    --text-tertiary: var(--neutral-500);
    --border-light: var(--neutral-200);
    --border-medium: var(--neutral-300);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-full: 9999px;
    
    /* Typography */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    
    /* Layout */
    --header-height: 64px;
    --sidebar-width: 280px;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: var(--neutral-900);
    --bg-secondary: var(--neutral-800);
    --bg-tertiary: var(--neutral-700);
    --bg-hover: var(--neutral-600);
    --text-primary: var(--neutral-50);
    --text-secondary: var(--neutral-200);
    --text-tertiary: var(--neutral-400);
    --border-light: var(--neutral-700);
    --border-medium: var(--neutral-600);
}

/* ===== GLOBAL STYLES ===== */
html {
    font-size: 16px;
    height: 100%;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    height: 100%;
    overflow: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* ===== ACCESSIBILITY ===== */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-600);
    color: white;
    padding: var(--space-2) var(--space-4);
    text-decoration: none;
    z-index: 9999;
}

.skip-link:focus {
    top: 0;
}

:focus-visible {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
}

/* ===== LAYOUT ===== */
.app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

.main-layout {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Header */
.header {
    height: var(--header-height);
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-4);
    box-shadow: var(--shadow-sm);
    z-index: 100;
}

.header-left, .header-right {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-right: var(--space-4);
}

.logo-icon {
    font-size: 1.5rem;
    color: var(--primary-600);
}

.logo-text {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

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

.pro-badge {
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
    color: white;
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
    color: white;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-success {
    background: var(--success-600);
    color: white;
}

.btn-success:hover:not(:disabled) {
    background: var(--success-500);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-medium);
    color: var(--text-primary);
}

.btn-outline:hover {
    border-color: var(--primary-500);
    color: var(--primary-600);
}

.btn-icon {
    padding: var(--space-2);
    border-radius: var(--radius-full);
    width: 36px;
    height: 36px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
}

.btn-icon:hover {
    background-color: var(--bg-tertiary);
    color: var(--primary-600);
}

.btn-sm {
    padding: var(--space-1) var(--space-2);
    font-size: 0.75rem;
}

.btn-block {
    width: 100%;
}

/* ===== SIDEBARS ===== */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.right-sidebar {
    border-right: none;
    border-left: 1px solid var(--border-light);
}

.sidebar-header {
    height: 48px;
    padding: 0 var(--space-4);
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    background-color: var(--bg-tertiary);
}

.sidebar-header h2 {
    font-size: 0.875rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-4);
}

.control-section {
    margin-bottom: var(--space-6);
}

.control-section h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-tertiary);
    margin-bottom: var(--space-3);
    font-weight: 600;
}

/* Chart Type Grid */
.chart-type-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-2);
}

.chart-type {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-2);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--text-primary);
}

.chart-type i {
    font-size: 1.25rem;
    color: var(--primary-600);
    margin-bottom: var(--space-1);
}

.chart-type span {
    font-size: 0.7rem;
    font-weight: 500;
}

.chart-type:hover {
    border-color: var(--primary-500);
    transform: translateY(-1px);
}

.chart-type.active {
    border-color: var(--primary-600);
    background: var(--primary-50);
    color: var(--primary-700);
}

[data-theme="dark"] .chart-type.active {
    background: rgba(99, 102, 241, 0.2);
}

/* ===== FORM ELEMENTS ===== */
.form-group {
    margin-bottom: var(--space-3);
}

.form-group label {
    display: block;
    margin-bottom: var(--space-1);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--space-2) var(--space-3);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: all 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px var(--primary-100);
}

.form-row {
    display: flex;
    gap: var(--space-2);
}

.form-row .half {
    flex: 1;
}

/* ===== TABS ===== */
.tabs {
    display: flex;
    gap: var(--space-1);
    margin-bottom: var(--space-3);
    border-bottom: 1px solid var(--border-light);
}

.tab-btn {
    padding: var(--space-2) var(--space-3);
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 500;
    border-bottom: 2px solid transparent;
    transition: all 0.2s ease;
}

.tab-btn:hover {
    color: var(--primary-600);
}

.tab-btn.active {
    color: var(--primary-600);
    border-bottom-color: var(--primary-600);
}

.tab-panel {
    display: none;
}

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

/* ===== DROP ZONE ===== */
.drop-zone {
    border: 2px dashed var(--border-medium);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-bottom: var(--space-3);
}

.drop-zone i {
    font-size: 2rem;
    color: var(--primary-600);
    margin-bottom: var(--space-2);
}

.drop-zone:hover {
    border-color: var(--primary-500);
    background: var(--primary-50);
}

[data-theme="dark"] .drop-zone:hover {
    background: rgba(99, 102, 241, 0.1);
}

.drop-zone .small {
    font-size: 0.7rem;
    color: var(--text-tertiary);
}

/* ===== TEMPLATE GRID ===== */
.template-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-2);
}

.template-item {
    padding: var(--space-3);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-1);
    color: var(--text-primary);
}

.template-item i {
    font-size: 1.25rem;
    color: var(--primary-600);
}

.template-item span {
    font-size: 0.7rem;
    font-weight: 500;
}

.template-item:hover {
    border-color: var(--primary-500);
    transform: translateY(-1px);
}

/* ===== COLOR PALETTES ===== */
.palette-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-2);
}

.palette-btn {
    display: flex;
    gap: 2px;
    padding: 2px;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.palette-btn span {
    flex: 1;
    height: 20px;
    border-radius: 2px;
}

.palette-btn:hover {
    border-color: var(--primary-300);
}

.palette-btn.active {
    border-color: var(--primary-600);
}

/* ===== THEME OPTIONS ===== */
.theme-options {
    display: flex;
    gap: var(--space-2);
}

.theme-btn {
    flex: 1;
    padding: var(--space-2);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-1);
    font-size: 0.75rem;
}

.theme-btn i {
    font-size: 0.875rem;
}

.theme-btn:hover {
    border-color: var(--primary-500);
}

.theme-btn.active {
    background: var(--primary-600);
    color: white;
    border-color: var(--primary-700);
}

/* ===== STATS PANEL ===== */
.stats-panel {
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    padding: var(--space-3);
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-2);
}

.stat-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-1) var(--space-2);
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
}

.stat-row strong {
    color: var(--primary-600);
    font-family: monospace;
}

/* ===== MAIN CONTENT ===== */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--bg-primary);
}

/* Chart Toolbar */
.chart-toolbar {
    height: 48px;
    padding: 0 var(--space-4);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.toolbar-left {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.toolbar-btn {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.toolbar-btn:hover {
    background: var(--bg-tertiary);
    color: var(--primary-600);
}

.separator {
    width: 1px;
    height: 24px;
    background: var(--border-light);
    margin: 0 var(--space-2);
}

/* Chart Container */
.chart-container-wrapper {
    flex: 1;
    padding: var(--space-4);
    position: relative;
}

.chart-container {
    width: 100%;
    height: 100%;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    position: relative;
    overflow: hidden;
}

#mainChart {
    width: 100% !important;
    height: 100% !important;
}

.chart-loading {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(var(--bg-primary-rgb), 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(2px);
}

/* Data Editor */
.data-editor {
    border-top: 1px solid var(--border-light);
    background: var(--bg-secondary);
    max-height: 200px;
    display: flex;
    flex-direction: column;
}

.editor-header {
    padding: var(--space-2) var(--space-4);
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.editor-header h4 {
    font-size: 0.875rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.editor-actions {
    display: flex;
    gap: var(--space-1);
}

.table-responsive {
    flex: 1;
    overflow: auto;
}

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

.data-table th,
.data-table td {
    padding: var(--space-2) var(--space-3);
    border: 1px solid var(--border-light);
    text-align: left;
}

.data-table th {
    background: var(--bg-tertiary);
    font-weight: 600;
    position: sticky;
    top: 0;
}

.data-table td input {
    width: 100%;
    padding: var(--space-1);
    border: 1px solid transparent;
    background: transparent;
    color: var(--text-primary);
}

.data-table td input:focus {
    outline: none;
    border-color: var(--primary-500);
    background: var(--bg-primary);
}

/* ===== RIGHT SIDEBAR ===== */
.insights-panel {
    margin-bottom: var(--space-4);
}

.insight-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-2);
    padding: var(--space-3);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-2);
    border-left: 3px solid var(--primary-500);
    font-size: 0.75rem;
}

.insight-item i {
    color: var(--primary-600);
    font-size: 0.875rem;
}

.insight-item p {
    flex: 1;
    margin: 0;
    color: var(--text-secondary);
}

.export-quick h3 {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-tertiary);
    margin-bottom: var(--space-2);
    text-transform: uppercase;
}

.quick-export-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-2);
}

.quick-export-btn {
    padding: var(--space-2);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-1);
    font-size: 0.7rem;
    color: var(--text-primary);
}

.quick-export-btn i {
    color: var(--primary-600);
}

.quick-export-btn:hover {
    border-color: var(--primary-500);
    transform: translateY(-1px);
}

/* ===== DROPDOWN MENU ===== */
.export-dropdown {
    position: relative;
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    z-index: 1000;
    margin-top: var(--space-1);
}

.dropdown-menu.show {
    display: block;
}

.dropdown-header {
    padding: var(--space-2) var(--space-3);
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-light);
}

.dropdown-menu a {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.75rem;
    transition: all 0.2s ease;
}

.dropdown-menu a:hover {
    background: var(--bg-tertiary);
    color: var(--primary-600);
    padding-left: var(--space-4);
}

.dropdown-menu a i {
    width: 16px;
    color: var(--text-tertiary);
}

/* ===== USER MENU ===== */
.user-menu {
    position: relative;
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    border: 2px solid transparent;
    cursor: pointer;
    overflow: hidden;
    padding: 0;
    background: none;
}

.user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.user-avatar:hover {
    border-color: var(--primary-500);
}

.user-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    width: 180px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    z-index: 1000;
    margin-top: var(--space-1);
}

.user-dropdown.show {
    display: block;
}

.user-dropdown a {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.875rem;
}

.user-dropdown a:hover {
    background: var(--bg-tertiary);
    color: var(--primary-600);
}

.dropdown-divider {
    height: 1px;
    background: var(--border-light);
    margin: var(--space-1) 0;
}

/* ===== FOOTER ===== */
.footer {
    height: 48px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-4);
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

.footer-left p {
    margin: 0;
}

.version-badge {
    padding: var(--space-1) var(--space-2);
    background: var(--primary-50);
    border-radius: var(--radius-full);
    color: var(--primary-700);
    font-size: 0.7rem;
}

[data-theme="dark"] .version-badge {
    background: rgba(99, 102, 241, 0.2);
    color: var(--primary-400);
}

/* ===== LOADING ===== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.3s ease;
}

.loading-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 3px solid var(--primary-200);
    border-top-color: var(--primary-600);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--space-4);
}

.spinner-small {
    width: 30px;
    height: 30px;
    border: 2px solid var(--primary-200);
    border-top-color: var(--primary-600);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* ===== UTILITIES ===== */
.separator {
    width: 1px;
    height: 24px;
    background: var(--border-light);
    margin: 0 var(--space-2);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .right-sidebar {
        display: none;
    }
}

@media (max-width: 768px) {
    .left-sidebar {
        position: fixed;
        left: -280px;
        top: var(--header-height);
        height: calc(100vh - var(--header-height));
        z-index: 90;
        transition: left 0.3s ease;
    }
    
    .left-sidebar.open {
        left: 0;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .quick-actions .btn-text {
        display: none;
    }
}