/* ------------- CSS Variables - Light Theme (Default) ------------- */
:root {
    /* Backgrounds */
    --bg-body: #f8f9fa;
    --bg-card: #ffffff;
    --bg-navbar: #2c3e50;
    --bg-input: #f1f5f9;
    --bg-modal: #ffffff;
    
    /* Text */
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-inverse: #ffffff;
    --text-muted: #95a5a6;
    
    /* Brand Colors */
    --brand-primary: #3498db;
    --brand-secondary: #2c3e50;
    --brand-danger: #e74c3c;
    --brand-success: #27ae60;
    --brand-warning: #f39c12;
    
    /* Borders */
    --border-color: #dee2e6;
    --border-light: #e9ecef;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    
    /* Navbar */
    --navbar-bg: #2c3e50;
    --navbar-text: #ecf0f1;
    --navbar-hover: #34495e;
    
    /* Card */
    --card-bg: #ffffff;
    --card-header-bg: #3498db;
    --card-header-text: #ffffff;
    --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    
    /* Buttons */
    --btn-admin-bg: #e74c3c;
    --btn-admin-hover: #c0392b;
    
    /* Alert */
    --alert-bg: #ffffff;
    
    /* Form inputs */
    --input-bg: #f1f5f9;
    --input-border: #ced4da;
    --input-text: #212529;
    
    /* Links */
    --link-color: #3498db;
    --link-hover: #2980b9;
    
    /* Table */
    --table-header-bg: #f8f9fa;
    --table-border: #dee2e6;
    --table-striped-bg: #f8f9fa;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
}

/* ------------- CSS Variables - Dark Theme ------------- */
[data-theme="dark"] {
    /* Backgrounds */
    --bg-body: #1a1a2e;
    --bg-card: #16213e;
    --bg-navbar: #0f0f23;
    --bg-input: #1a1a2e;
    --bg-modal: #16213e;
    
    /* Text */
    --text-primary: #e4e6eb;
    --text-secondary: #b0b3b8;
    --text-inverse: #1a1a2e;
    --text-muted: #72809d;
    
    /* Brand Colors */
    --brand-primary: #4dabf7;
    --brand-secondary: #4a5568;
    --brand-danger: #f87171;
    --brand-success: #4ade80;
    --brand-warning: #fbbf24;
    
    /* Borders */
    --border-color: #2d3748;
    --border-light: #1f2937;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
    
    /* Navbar */
    --navbar-bg: #0f0f23;
    --navbar-text: #e4e6eb;
    --navbar-hover: #1f2937;
    
    /* Card */
    --card-bg: #16213e;
    --card-header-bg: #1a1a2e;
    --card-header-text: #e4e6eb;
    --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    
    /* Buttons */
    --btn-admin-bg: #dc2626;
    --btn-admin-hover: #b91c1c;
    
    /* Alert */
    --alert-bg: #1f2937;
    
    /* Form inputs */
    --input-bg: #1a1a2e;
    --input-border: #374151;
    --input-text: #e4e6eb;
    
    /* Links */
    --link-color: #4dabf7;
    --link-hover: #74c0fc;
    
    /* Table */
    --table-header-bg: #1a1a2e;
    --table-border: #2d3748;
    --table-striped-bg: #16213e;
}

/* ------------- Base Styles ------------- */
body {
    background-color: var(--bg-body);
    color: var(--text-primary);
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Navbar */
.navbar {
    background-color: var(--navbar-bg) !important;
    transition: background-color var(--transition-normal);
}

.navbar-brand {
    font-weight: bold;
    color: var(--navbar-text) !important;
}

.nav-link {
    color: var(--navbar-text) !important;
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-link:hover {
    color: var(--navbar-text) !important;
    background-color: var(--navbar-hover);
    border-radius: 4px;
}

/* Theme Toggle Button */
.theme-toggle {
    background: transparent;
    border: 1px solid var(--navbar-text);
    color: var(--navbar-text);
    padding: 0.375rem 0.75rem;
    border-radius: 0.375rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 1.1rem;
    margin-left: 0.5rem;
}

.theme-toggle:hover {
    background-color: var(--navbar-hover);
    transform: scale(1.05);
}

.theme-toggle:focus {
    outline: none;
    box-shadow: 0 0 0 2px var(--brand-primary);
}

/* Cards */
.card {
    margin-bottom: 20px;
    border: none;
    box-shadow: var(--card-shadow);
    background-color: var(--card-bg);
    color: var(--text-primary);
    transition: background-color var(--transition-normal), box-shadow var(--transition-normal);
}

.card-header {
    background-color: var(--card-header-bg);
    color: var(--card-header-text);
    font-weight: bold;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Buttons */
.btn-admin {
    background-color: var(--btn-admin-bg);
    color: white;
    transition: background-color var(--transition-fast);
}

.btn-admin:hover {
    background-color: var(--btn-admin-hover);
}

/* Form Inputs */
.form-control, .form-select {
    background-color: var(--input-bg);
    border-color: var(--input-border);
    color: var(--input-text);
    transition: background-color var(--transition-normal), border-color var(--transition-normal), color var(--transition-normal);
}

.form-control:focus, .form-select:focus {
    background-color: var(--input-bg);
    border-color: var(--brand-primary);
    color: var(--input-text);
    box-shadow: 0 0 0 0.2rem rgba(52, 152, 219, 0.25);
}

/* Tables */
.table {
    color: var(--text-primary);
    transition: color var(--transition-normal);
}

.table thead {
    background-color: var(--table-header-bg);
}

.table-bordered {
    border-color: var(--table-border);
}

.table-striped > tbody > tr:nth-of-type(odd) {
    background-color: var(--table-striped-bg);
}

/* Modals */
.modal-content {
    background-color: var(--bg-modal);
    color: var(--text-primary);
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

.modal-header {
    border-bottom-color: var(--border-color);
}

.modal-footer {
    border-top-color: var(--border-color);
}

/* Alerts */
.alert {
    background-color: var(--alert-bg);
    border-color: var(--border-color);
    color: var(--text-primary);
    transition: background-color var(--transition-normal), border-color var(--transition-normal), color var(--transition-normal);
}

/* Links */
a {
    color: var(--link-color);
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--link-hover);
}

/* Pagination */
.page-link {
    background-color: var(--bg-card);
    border-color: var(--border-color);
    color: var(--link-color);
    transition: all var(--transition-fast);
}

.page-link:hover {
    background-color: var(--table-striped-bg);
    border-color: var(--border-color);
    color: var(--link-hover);
}

.page-item.active .page-link {
    background-color: var(--brand-primary);
    border-color: var(--brand-primary);
}

.page-item.disabled .page-link {
    background-color: var(--table-striped-bg);
    color: var(--text-muted);
}

/* Dropdown */
.dropdown-menu {
    background-color: var(--bg-card);
    border-color: var(--border-color);
    color: var(--text-primary);
}

.dropdown-item {
    color: var(--text-primary);
    transition: background-color var(--transition-fast);
}

.dropdown-item:hover {
    background-color: var(--table-striped-bg);
    color: var(--text-primary);
}

/* Badge */
.badge {
    color: white;
}

/* Text utilities */
.text-muted {
    color: var(--text-muted) !important;
}

.text-secondary {
    color: var(--text-secondary) !important;
}

/* Background utilities */
.bg-light {
    background-color: var(--table-striped-bg) !important;
}

.bg-white {
    background-color: var(--bg-card) !important;
}

/* Border utilities */
.border {
    border-color: var(--border-color) !important;
}