/* Main Styles - Core Layout & Design */
/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --primary-color: #ff4757;
    --primary-dark: #e63946;
    --secondary-color: #3742fa;
    --secondary-dark: #2f3542;
    --success-color: #2ed573;
    --warning-color: #ffa502;
    --danger-color: #ff4757;
    
    /* Neutral Colors */
    --bg-primary: #f8f9fa;
    --bg-secondary: #ffffff;
    --bg-dark: #2f3542;
    --text-primary: #2f3542;
    --text-secondary: #747d8c;
    --text-light: #a4b0be;
    --border-color: #ddd;
    --shadow-light: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-medium: 0 4px 20px rgba(0,0,0,0.15);
    --shadow-dark: 0 8px 30px rgba(0,0,0,0.2);
    
    /* Typography */
    --font-primary: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Borders */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

/* Navigation Styles */
.navbar {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    box-shadow: var(--shadow-medium);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: white;
    font-weight: bold;
    font-size: var(--font-size-xl);
}

.nav-brand i {
    font-size: var(--font-size-2xl);
    color: #ffda79;
}

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

.nav-btn {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-lg);
    cursor: pointer;
    transition: var(--transition-normal);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
    font-weight: 500;
    backdrop-filter: blur(10px);
}

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

.nav-btn.active {
    background: rgba(255, 255, 255, 0.25);
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: white;
    border-radius: 2px;
    transition: var(--transition-normal);
}

/* Main Content */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

.content-section {
    display: none;
    animation: fadeIn 0.5s ease;
}

.content-section.active {
    display: block;
}

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

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-header h2 {
    font-size: var(--font-size-3xl);
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.section-header p {
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.stat-card {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-light);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

.stat-card.primary::before { background: var(--primary-color); }
.stat-card.secondary::before { background: var(--secondary-color); }
.stat-card.success::before { background: var(--success-color); }
.stat-card.warning::before { background: var(--warning-color); }

.stat-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: var(--font-size-2xl);
    color: white;
}

.stat-card.primary .stat-icon { background: var(--primary-color); }
.stat-card.secondary .stat-icon { background: var(--secondary-color); }
.stat-card.success .stat-icon { background: var(--success-color); }
.stat-card.warning .stat-icon { background: var(--warning-color); }

.stat-content h3 {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.stat-number {
    font-size: var(--font-size-2xl);
    font-weight: bold;
    color: var(--text-primary);
    display: block;
}

.stat-change {
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-top: var(--spacing-xs);
}

.stat-change.positive { color: var(--success-color); }
.stat-change.negative { color: var(--danger-color); }
.stat-change.neutral { color: var(--text-secondary); }

/* Charts Grid */
.charts-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.chart-container {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-light);
}

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

.chart-header h3 {
    color: var(--text-primary);
    font-size: var(--font-size-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.chart-controls select {
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    background: white;
    font-size: var(--font-size-sm);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-normal);
    text-decoration: none;
    white-space: nowrap;
}

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

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

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

.btn.secondary:hover {
    background: var(--bg-primary);
    border-color: var(--primary-color);
}

/* Form Elements */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-base);
    transition: var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(255, 71, 87, 0.1);
}

.input-group {
    display: flex;
}

.input-group input {
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
    border-right: none;
}

.input-group button {
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
    border-left: 1px solid var(--border-color);
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    backdrop-filter: blur(5px);
}

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

.loading-spinner {
    text-align: center;
    color: var(--primary-color);
}

.loading-spinner i {
    margin-bottom: var(--spacing-md);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .charts-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .main-content {
        padding: var(--spacing-lg) var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .nav-brand h1 {
        font-size: var(--font-size-lg);
    }
    
    .section-header h2 {
        font-size: var(--font-size-2xl);
    }
    
    .stat-card {
        padding: var(--spacing-lg);
    }
}