/* ==================== CSS VARIABLES - DESIGN SYSTEM ==================== */
:root {
    /* Colors - Light Mode */
    --color-bg: #FAFAFA;
    --color-surface: #FFFFFF;
    --color-text: #1A1A1A;
    --color-text-secondary: #6B7280;
    --color-border: #E5E7EB;
    --color-accent: #2563EB;
    --color-accent-hover: #1D4ED8;
    --color-success: #10B981;
    --color-success-bg: #D1FAE5;
    --color-warning: #F59E0B;
    --color-warning-bg: #FEF3C7;
    --color-error: #EF4444;
    --color-error-bg: #FEE2E2;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-xl: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Courier New', monospace;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

/* Dark Mode */
[data-theme="dark"] {
    --color-bg: #0F0F0F;
    --color-surface: #1A1A1A;
    --color-text: #E5E5E5;
    --color-text-secondary: #9CA3AF;
    --color-border: #374151;
    --color-accent: #3B82F6;
    --color-accent-hover: #2563EB;
    --color-success: #059669;
    --color-success-bg: #064E3B;
    --color-warning: #D97706;
    --color-warning-bg: #78350F;
    --color-error: #DC2626;
    --color-error-bg: #7F1D1D;
}

/* ==================== RESET & BASE ==================== */
*, *::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);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* Respect reduced motion preference */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ==================== IFRAME-SPECIFIC STYLES ==================== */
body.in-iframe {
    min-height: auto;
    height: auto;
}

body.in-iframe .main {
    flex: none;
}

/* ==================== LAYOUT ==================== */
.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.wide-section {
    width: 100%;
    max-width: 100%;
    margin: 0;
    grid-column: 1 / -1; /* Span all columns in parent grid */
}

.main {
    flex: 1;
    padding: var(--space-xl) 0;
}

/* ==================== HEADER ==================== */
.header {
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color var(--transition-base), border-color var(--transition-base);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-lg);
    padding-bottom: var(--space-lg);
}

.app-title {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    color: var(--color-text);
}

.theme-toggle {
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    color: var(--color-text);
}

.theme-toggle:hover {
    background-color: var(--color-bg);
    border-color: var(--color-accent);
}

.theme-toggle:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.theme-icon {
    width: 20px;
    height: 20px;
}

.theme-icon-dark {
    display: none;
}

[data-theme="dark"] .theme-icon-light {
    display: none;
}

[data-theme="dark"] .theme-icon-dark {
    display: block;
}

/* ==================== CARDS ==================== */
.card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    margin-bottom: var(--space-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.grid-2-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

@media (max-width: 768px) {
    .grid-2-columns {
        grid-template-columns: 1fr;
    }
}

.card-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-lg);
    color: var(--color-text);
}

.section-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-lg);
    color: var(--color-text);
}

.subsection-title {
    font-size: 1rem;
    font-weight: 600;
    margin-top: var(--space-xl);
    margin-bottom: var(--space-lg);
    color: var(--color-text);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.875rem;
}

/* ==================== UPLOAD AREA ==================== */
.upload-area {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
    text-align: center;
    transition: all var(--transition-base);
    cursor: pointer;
}

.upload-area:hover {
    border-color: var(--color-accent);
    background-color: var(--color-bg);
}

.upload-area.drag-over {
    border-color: var(--color-accent);
    background-color: var(--color-bg);
    box-shadow: var(--shadow-lg);
}

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
}

.upload-icon {
    color: var(--color-text-secondary);
    transition: color var(--transition-base);
}

.upload-area:hover .upload-icon {
    color: var(--color-accent);
}

.upload-text {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--color-text);
}

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

.file-info {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg);
    background-color: var(--color-bg);
    border-radius: var(--radius-md);
}

.file-icon {
    color: var(--color-accent);
    flex-shrink: 0;
}

.file-name {
    flex: 1;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ==================== UPLOADED FILES LIST ==================== */
.uploaded-files-list {
    margin-top: var(--space-lg);
    padding: var(--space-lg);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

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

.files-header h4 {
    margin: 0;
    font-size: 1rem;
    color: var(--color-text);
}

.files-container {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.file-chip {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
}

.file-chip-name {
    color: var(--color-text);
}

.file-chip-trades {
    color: var(--color-text-secondary);
    font-size: 0.75rem;
}

.file-chip-remove {
    background: none;
    border: none;
    color: var(--color-error);
    cursor: pointer;
    padding: 0;
    font-size: 1.2rem;
    line-height: 1;
}

.file-chip-remove:hover {
    color: #DC2626;
}

.files-summary {
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

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

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

.form-group-full {
    grid-column: 1 / -1;
}

.form-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text);
}

.form-input,
.form-select {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    font-size: 0.875rem;
    font-family: var(--font-sans);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    transition: all var(--transition-fast);
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-input:hover:not(:focus),
.form-select:hover:not(:focus) {
    border-color: var(--color-text-secondary);
}

.form-input-sm {
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.813rem;
}

.form-help {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

.form-checkbox {
    width: auto;
    margin-right: 0.5rem;
    cursor: pointer;
}

.fixed-ratio-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
    margin-top: var(--space-md);
}

.form-actions {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

/* ==================== BUTTONS ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    font-size: 0.875rem;
    font-weight: 600;
    font-family: var(--font-sans);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

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

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--color-accent-hover);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover:not(:disabled) {
    background-color: var(--color-bg);
    border-color: var(--color-text-secondary);
}

.btn-ghost {
    background-color: transparent;
    color: var(--color-text);
}

.btn-ghost:hover:not(:disabled) {
    background-color: var(--color-bg);
}

.btn-sm {
    padding: var(--space-xs) var(--space-md);
    font-size: 0.813rem;
}

.btn-icon {
    padding: var(--space-xs);
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

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

.btn-icon-left {
    width: 20px;
    height: 20px;
}

/* ==================== ALERTS ==================== */
.alert {
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    margin-top: var(--space-lg);
    border-left: 4px solid;
}

.alert-success {
    background-color: var(--color-success-bg);
    color: var(--color-success);
    border-color: var(--color-success);
}

.alert-warning {
    background-color: var(--color-warning-bg);
    color: var(--color-warning);
    border-color: var(--color-warning);
}

.alert-error {
    background-color: var(--color-error-bg);
    color: var(--color-error);
    border-color: var(--color-error);
}

.alert-info {
    background-color: rgba(37, 99, 235, 0.1);
    border-left: 3px solid var(--color-accent);
    padding: var(--space-md);
    margin-bottom: var(--space-lg);
    border-radius: var(--radius-sm);
    color: var(--color-text);
}

/* ==================== PROGRESS ==================== */
.progress-card {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 120px;
}

.progress-content {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

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

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

.progress-text {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.progress-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
}

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

/* ==================== TABS ==================== */
.tabs {
    display: flex;
    gap: var(--space-xs);
    border-bottom: 2px solid var(--color-border);
    margin-bottom: var(--space-xl);
    overflow-x: auto;
}

.tab {
    padding: var(--space-md) var(--space-lg);
    font-size: 0.875rem;
    font-weight: 600;
    font-family: var(--font-sans);
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.tab:hover {
    color: var(--color-text);
    background-color: var(--color-bg);
}

.tab.active {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
}

.tab:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: -2px;
}

.tab-panel {
    animation: fadeIn var(--transition-base);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ==================== PRIMARY METRICS (QuantAnalyzer Style) ==================== */
.primary-metrics {
    margin-bottom: var(--space-xl);
}

.primary-metric-card {
    background: linear-gradient(135deg, var(--color-success) 0%, #059669 100%);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    color: white !important;
    box-shadow: var(--shadow-lg);
}

.primary-metric-label {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-sm);
    color: white !important;
    opacity: 1;
}

.primary-metric-value {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--space-lg);
    font-variant-numeric: tabular-nums;
    line-height: 1;
    color: white !important;
}

.primary-metric-sub {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--space-md);
    padding-top: var(--space-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.3);
}

.sub-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.sub-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: rgba(255, 255, 255, 0.95) !important;
}

.sub-value {
    font-size: 1.125rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    color: white !important;
}

/* ==================== STATS GRID (Clean Table Style) ==================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.stat-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--color-border);
    border-right: 1px solid var(--color-border);
    background-color: var(--color-surface);
    transition: background-color var(--transition-fast);
}

.stat-row:hover {
    background-color: var(--color-bg);
}

.stat-label {
    font-size: 0.813rem;
    color: var(--color-text-secondary);
    font-weight: 500;
}

.stat-value {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text);
    font-variant-numeric: tabular-nums;
}

.metric-success {
    color: var(--color-success);
}

.metric-error {
    color: var(--color-error);
}

/* ==================== CHARTS ==================== */
.chart-container {
    position: relative;
    height: 400px;
    padding: var(--space-md);
    background-color: var(--color-bg);
    border-radius: var(--radius-md);
}

.chart-container-equity {
    height: 350px;
    margin-bottom: var(--space-md);
}

.chart-container-drawdown {
    height: 150px;
    margin-bottom: var(--space-lg);
}

.summary-charts {
    opacity: 0;
    transform: translateY(20px);
    animation: slideInUp 0.8s ease-out forwards;
    margin-bottom: var(--space-xl);
}

.chart-controls {
    display: flex;
    justify-content: flex-end;
    margin-bottom: var(--space-md);
}

.chart-toggle {
    display: flex;
    gap: 0;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-xs);
}

.toggle-btn {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-md);
    font-size: 0.813rem;
    font-weight: 600;
    font-family: var(--font-sans);
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.toggle-btn:hover {
    color: var(--color-text);
    background-color: var(--color-surface);
}

.toggle-btn.active {
    background-color: var(--color-accent);
    color: white;
}

.toggle-btn svg {
    width: 16px;
    height: 16px;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==================== TABLES ==================== */
.table-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
    gap: var(--space-md);
}

.table-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
}

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

.table-container {
    overflow-x: auto;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

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

.data-table thead {
    background-color: var(--color-bg);
    position: sticky;
    top: 0;
    z-index: 10;
}

.data-table th {
    padding: var(--space-md);
    text-align: left;
    font-weight: 600;
    color: var(--color-text);
    border-bottom: 2px solid var(--color-border);
    white-space: nowrap;
}

.data-table th.sortable {
    cursor: pointer;
    user-select: none;
}

.data-table th.sortable:hover {
    background-color: var(--color-surface);
}

.data-table th.sorted-asc::after {
    content: ' ↑';
    color: var(--color-accent);
}

.data-table th.sorted-desc::after {
    content: ' ↓';
    color: var(--color-accent);
}

.data-table td {
    padding: var(--space-md);
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text);
}

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

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

.data-table tbody tr:last-child td {
    border-bottom: none;
}

/* ==================== PAGINATION ==================== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

.pagination-pages {
    display: flex;
    gap: var(--space-xs);
}

.pagination-pages button {
    min-width: 32px;
    height: 32px;
    padding: var(--space-xs);
    font-size: 0.813rem;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.pagination-pages button:hover:not(.active) {
    background-color: var(--color-bg);
    border-color: var(--color-text-secondary);
}

.pagination-pages button.active {
    background-color: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
}

/* ==================== UTILITY CLASSES ==================== */
[hidden] {
    display: none !important;
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
    .header .container {
        padding-top: var(--space-md);
        padding-bottom: var(--space-md);
    }

    .app-title {
        font-size: 1.5rem;
    }

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

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

    .primary-metric-value {
        font-size: 2.5rem;
    }

    .primary-metric-sub {
        grid-template-columns: 1fr 1fr;
    }

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

    .chart-container-equity {
        height: 280px;
    }

    .chart-container-drawdown {
        height: 120px;
    }

    .chart-container {
        height: 300px;
    }

    .tabs {
        gap: 0;
    }

    .tab {
        padding: var(--space-sm) var(--space-md);
        font-size: 0.813rem;
    }

    .form-actions {
        flex-direction: column;
    }

    .form-actions .btn {
        width: 100%;
    }

    .table-controls {
        flex-direction: column;
        align-items: stretch;
    }
}

@media (max-width: 480px) {
    .upload-area {
        padding: var(--space-lg);
    }

    .upload-icon {
        width: 32px;
        height: 32px;
    }

    .upload-text {
        font-size: 1rem;
    }

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

/* ==================== PRINT STYLES ==================== */
@media print {
    .header,
    .footer,
    .upload-card,
    .options-card,
    .tabs,
    .btn {
        display: none;
    }

    body {
        background: white;
        color: black;
    }

    .card {
        box-shadow: none;
        border: 1px solid #ccc;
        page-break-inside: avoid;
    }
}