/* Modern Bright Professional Color Scheme */
:root {
    /* Primary Colors - Bright but Professional */
    --primary: #4A90E2;        /* Bright Blue */
    --primary-dark: #357ABD;   /* Darker Blue */
    --primary-light: #6BA3E8;  /* Lighter Blue */
    
    /* Secondary Colors */
    --secondary: #50C878;      /* Fresh Green */
    --secondary-dark: #3FA066; /* Darker Green */
    --secondary-light: #6FD88A; /* Lighter Green */
    
    /* Accent Colors */
    --accent: #FF6B6B;          /* Coral Red */
    --accent-yellow: #FFD93D;   /* Bright Yellow */
    --accent-purple: #9B59B6;   /* Purple */
    
    /* Neutral Colors */
    --background: #F8F9FA;      /* Light Gray Background */
    --surface: #FFFFFF;         /* White Surface */
    --text-primary: #2C3E50;    /* Dark Gray Text */
    --text-secondary: #7F8C8D; /* Medium Gray Text */
    --text-light: #BDC3C7;      /* Light Gray Text */
    
    /* Status Colors */
    --success: #50C878;
    --warning: #FFD93D;
    --error: #FF6B6B;
    --info: #4A90E2;
    
    /* Borders & Shadows */
    --border: #E1E8ED;
    --border-light: #F0F4F8;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.15);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
}

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

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

/* Navigation */
.navbar {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: var(--spacing-md) 0;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.nav-brand a {
    font-size: 1.5rem;
    font-weight: bold;
    color: white;
    text-decoration: none;
    transition: opacity 0.2s;
}

.nav-brand a:hover {
    opacity: 0.9;
}

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

.nav-links a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 6px;
    transition: background-color 0.2s;
}

.nav-links a:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* Main Content */
.main-content {
    flex: 1;
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

/* Flash Messages */
.flash-messages {
    margin-bottom: var(--spacing-lg);
}

.flash-message {
    padding: var(--spacing-md);
    border-radius: 8px;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    box-shadow: var(--shadow-sm);
}

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

.flash-error {
    background-color: var(--error);
    color: white;
}

.flash-warning {
    background-color: var(--warning);
    color: var(--text-primary);
}

.flash-info {
    background-color: var(--info);
    color: white;
}

/* Cards */
.card {
    background: var(--surface);
    border-radius: 12px;
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    margin-bottom: var(--spacing-lg);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--border-light);
}

.card-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}

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

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

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

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

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

.btn-danger:hover {
    background: #E55555;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

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

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

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

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s;
    background: var(--surface);
    color: var(--text-primary);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
}

.form-error {
    color: var(--error);
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
}

/* Tables */
.table-container {
    overflow-x: auto;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--surface);
}

thead {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
}

th {
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
}

td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-light);
}

tbody tr:hover {
    background-color: var(--background);
}

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

/* Badges */
.badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 12px;
    font-size: 0.875rem;
    font-weight: 500;
}

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

.badge-warning {
    background-color: var(--warning);
    color: var(--text-primary);
}

.badge-error {
    background-color: var(--error);
    color: white;
}

.badge-info {
    background-color: var(--info);
    color: white;
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: white;
    text-align: center;
    padding: var(--spacing-lg);
    margin-top: auto;
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

.flex {
    display: flex;
}

.flex-between {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }

/* 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);
    }
    
    .card {
        padding: var(--spacing-md);
    }
}