/*** Base CSS - Global Styles & Variables ***/

/* CSS Variables */
:root {
    /* Primary Colors - Professional Blue Theme */
    --bs-primary: #2563eb;
    --bs-primary-rgb: 37, 99, 235;
    --bs-primary-dark: #1d4ed8;
    --bs-primary-light: #3b82f6;
    
    /* Secondary Colors */
    --bs-secondary: #64748b;
    --bs-secondary-rgb: 100, 116, 139;
    --bs-secondary-dark: #475569;
    --bs-secondary-light: #94a3b8;
    
    /* Success Colors */
    --bs-success: #059669;
    --bs-success-rgb: 5, 150, 105;
    --bs-success-dark: #047857;
    --bs-success-light: #10b981;
    
    /* Warning Colors */
    --bs-warning: #d97706;
    --bs-warning-rgb: 217, 119, 6;
    --bs-warning-dark: #b45309;
    --bs-warning-light: #f59e0b;
    
    /* Danger Colors */
    --bs-danger: #dc2626;
    --bs-danger-rgb: 220, 38, 38;
    --bs-danger-dark: #b91c1c;
    --bs-danger-light: #ef4444;
    
    /* Neutral Colors */
    --bs-light: #f8fafc;
    --bs-dark: #0f172a;
    --bs-gray: #6b7280;
    --bs-gray-dark: #374151;
    --bs-gray-light: #f3f4f6;
    
    /* Text Colors */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --text-light: #f1f5f9;
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-gradient-light: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    
    /* Border Colors */
    --border-color: #e2e8f0;
    --border-color-light: #f1f5f9;
    --border-color-dark: #cbd5e1;
    
    /* Shadow Variables */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Typography */
    --font-family-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-family-heading: 'Saira', system-ui, -apple-system, sans-serif;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Border Radius */
    --border-radius-sm: 0.25rem;
    --border-radius-md: 0.375rem;
    --border-radius-lg: 0.5rem;
    --border-radius-xl: 0.75rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --border-radius-2xl: 1rem;
    --border-radius-full: 9999px;
    
    /* Modern Color Palette */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --primary-color: #667eea;
    --primary-dark: #5a67d8;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    
    /* Neutral Colors */
    --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;
    
    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

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

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

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family-heading);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
}

/* Header Styles */
.top-bar {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 8px 0;
    font-size: 14px;
}

.navbar {
    background: var(--bg-primary) !important;
    box-shadow: var(--shadow-sm);
    padding: 1rem 0;
}

.navbar-brand {
    font-weight: var(--font-weight-bold);
    font-size: 1.5rem;
    color: var(--bs-primary) !important;
}

.navbar-nav .nav-link {
    font-weight: var(--font-weight-medium);
    color: var(--text-primary) !important;
    padding: 0.75rem 1rem !important;
    border-radius: var(--border-radius-md);
    margin: 0 0.25rem;
    transition: var(--transition-normal);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
}

.navbar-nav .nav-link:hover {
    background: var(--bs-primary);
    color: var(--bs-success-light) !important;
    border-color: var(--bs-primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.navbar-nav .nav-link.active {
    background: var(--bs-success);
    color: white !important;
    border-color: var(--bs-success);
    box-shadow: var(--shadow-sm);
}

/* Main Content */
.main-content {
    min-height: calc(100vh - 200px);
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 2rem 0;
    margin-top: 4rem;
}

/* Buttons */
.btn-primary {
    background: var(--bs-primary);
    border: none;
    padding: 0.75rem 1.5rem;
    font-weight: var(--font-weight-medium);
    border-radius: var(--border-radius-md);
    transition: var(--transition-normal);
}

.btn-primary:hover {
    background: var(--bs-primary-dark);
    transform: translateY(-1px);
}

/* Cards */
.card {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
}

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

/* Spinner */
.spinner {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255,255,255,0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.spinner-border {
    width: 3rem;
    height: 3rem;
    color: var(--bs-primary);
}

/* Enhanced Spinner */
#spinner {
    opacity: 0;
    visibility: hidden;
    transition: opacity .8s ease-out, visibility 0s linear .5s;
    z-index: 99999;
}

#spinner.show {
    transition: opacity .8s ease-out, visibility 0s linear .0s;
    visibility: visible;
    opacity: 1;
}

/* Button Enhancements */
.btn {
    font-weight: 600;
    transition: .5s;
}

.btn-square {
    width: 38px;
    height: 38px;
}

.btn-sm-square {
    width: 32px;
    height: 32px;
}

.btn-md-square {
    width: 46px;
    height: 46px;
}

.btn-lg-square {
    width: 58px;
    height: 58px;
}

.btn-square,
.btn-sm-square,
.btn-md-square,
.btn-lg-square {
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: normal;
}

.back-to-top {
    position: fixed;
    width: 50px;
    height: 50px;
    right: 30px;
    bottom: 30px;
    z-index: 99;
}

/* Utility Classes */
.text-primary { color: var(--bs-primary) !important; }
.text-secondary { color: var(--bs-secondary) !important; }
.text-success { color: var(--bs-success) !important; }
.text-warning { color: var(--bs-warning) !important; }
.text-danger { color: var(--bs-danger) !important; }
.text-muted { color: var(--text-muted) !important; }

.bg-primary { background-color: var(--bs-primary) !important; }
.bg-secondary { background-color: var(--bs-secondary) !important; }
.bg-success { background-color: var(--bs-success) !important; }
.bg-warning { background-color: var(--bs-warning) !important; }
.bg-danger { background-color: var(--bs-danger) !important; }
.bg-light { background-color: var(--bg-secondary) !important; }

.border-primary { border-color: var(--bs-primary) !important; }
.border-secondary { border-color: var(--bs-secondary) !important; }
.border-light { border-color: var(--border-color) !important; }

.shadow-sm { box-shadow: var(--shadow-sm) !important; }
.shadow-md { box-shadow: var(--shadow-md) !important; }
.shadow-lg { box-shadow: var(--shadow-lg) !important; }
.shadow-xl { box-shadow: var(--shadow-xl) !important; }

.rounded-lg { border-radius: var(--border-radius-lg) !important; }
.rounded-xl { border-radius: var(--border-radius-xl) !important; }

/* Gradient Backgrounds */
.bg-gradient-light {
    background: var(--bg-gradient-light);
}

.bg-gradient-primary {
    background: linear-gradient(135deg, var(--bs-primary) 0%, var(--bs-primary-dark) 100%);
}

.bg-gradient-secondary {
    background: linear-gradient(135deg, var(--bs-secondary) 0%, var(--bs-secondary-dark) 100%);
}

/* Responsive Design */
@media (max-width: 768px) {
    .navbar-nav {
        background: var(--bg-primary);
        padding: 1rem;
        border-radius: var(--border-radius-lg);
        margin-top: 1rem;
        box-shadow: var(--shadow-md);
    }
}