/**
 * Default Theme - Portfolio Manager v2
 * 
 * Extensible theming system. To create a new theme, copy this file
 * and modify the CSS variables.
 */

:root {
    /* Colors */
    --primary-color: #007bff;
    --primary-hover: #0056b3;
    --secondary-color: #6c757d;
    --secondary-hover: #545b62;
    --success-color: #28a745;
    --success-hover: #218838;
    --error-color: #dc3545;
    --error-bg: #f8d7da;
    
    /* Backgrounds */
    --bg-color: #f5f5f5;
    --card-bg: #ffffff;
    --navbar-bg: #ffffff;
    --footer-bg: #f8f9fa;
    
    /* Text */
    --text-color: #333333;
    --text-muted: #6c757d;
    --text-light: #ffffff;
    
    /* Borders */
    --border-color: #dee2e6;
    
    /* Table */
    --table-header-bg: #f8f9fa;
    --table-header-hover: #e9ecef;
    --table-row-hover: #f8f9fa;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-lg: 0 4px 8px rgba(0,0,0,0.15);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navigation */
.navbar {
    background: var(--navbar-bg);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) 0;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
    /* Ensure navbar stays on top when scrolling */
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand h1 {
    font-size: 24px;
    font-weight: 600;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    transition: all 0.2s;
}

.nav-link:hover {
    background: var(--table-row-hover);
    color: var(--primary-color);
}

.nav-link.active {
    color: var(--primary-color);
    background: rgba(0, 123, 255, 0.1);
}

/* Main Content */
.main-content {
    flex: 1;
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
    padding: var(--spacing-lg);
    /* Ensure no transforms or overflow that break sticky on Android */
    overflow: visible;
    position: relative;
}

/* Footer */
.footer {
    background: var(--footer-bg);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-md);
    text-align: center;
    color: var(--text-muted);
    font-size: 14px;
    margin-top: auto;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .main-content {
        padding: var(--spacing-md);
    }
}