/* Modern Theme for Rendezvous Server Management
 * Professional, clean, and user-friendly design
 */

:root {
    /* Primary Brand Colors */
    --primary-blue: #4A90E2;
    --primary-dark: #2C3E50;
    --primary-light: #ECF0F1;
    
    /* Accent Colors */
    --accent-green: #27AE60;
    --accent-orange: #E67E22;
    --accent-red: #E74C3C;
    --accent-purple: #9B59B6;
    
    /* Status Colors */
    --status-online: #27AE60;
    --status-offline: #95A5A6;
    --status-warning: #F39C12;
    --status-error: #E74C3C;
    
    /* Neutral Colors */
    --gray-100: #F8F9FA;
    --gray-200: #E9ECEF;
    --gray-300: #DEE2E6;
    --gray-400: #CED4DA;
    --gray-500: #ADB5BD;
    --gray-600: #6C757D;
    --gray-700: #495057;
    --gray-800: #343A40;
    --gray-900: #212529;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.15);
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

/* Global Styles */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 15px;
    color: var(--gray-800);
    background-color: var(--gray-100);
    line-height: 1.5;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 500;
    line-height: 1.3;
    margin-bottom: 1rem;
}

h1 { font-size: 1.5rem; }
h2 { font-size: 1.25rem; }
h3 { font-size: 1.0625rem; }
h4 { font-size: 0.9375rem; }
h5 { font-size: 0.875rem; }
h6 { font-size: 0.8125rem; }

.text-muted { color: var(--gray-600) !important; }

/* Sidebar Improvements */
.sidebar {
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary-dark) 0%, #34495E 100%);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-normal);
}

.sidebar.user-portal {
    background: linear-gradient(135deg, var(--accent-green) 0%, #229954 100%);
}

.sidebar.superuser-portal {
    background: linear-gradient(135deg, var(--accent-purple) 0%, #8E44AD 100%);
}

.sidebar-brand {
    padding: 0.75rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    margin-bottom: 0.5rem;
}

.sidebar-brand h5 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sidebar-brand small {
    display: block;
    opacity: 0.8;
    font-size: 0.875rem;
}

.sidebar .nav-link {
    color: rgba(255,255,255,0.9);
    padding: 0.5rem 1rem;
    margin: 0.125rem 0.5rem;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sidebar .nav-link:hover {
    background-color: rgba(255,255,255,0.1);
    color: #fff;
    transform: translateX(4px);
}

.sidebar .nav-link.active {
    background-color: rgba(255,255,255,0.2);
    color: #fff;
    font-weight: 500;
    box-shadow: var(--shadow-sm);
}

.sidebar .nav-link i {
    width: 20px;
    text-align: center;
    font-size: 1.1em;
}

/* Main Content Area */
.main-content {
    margin-left: 0;
    padding: 1.25rem;
    min-height: 100vh;
}

@media (min-width: 768px) {
    .main-content {
        margin-left: 250px;
    }
}

.page-header {
    background: white;
    border-radius: var(--radius-lg);
    padding: 0.75rem 1.25rem;
    margin-bottom: 1.25rem;
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--primary-blue);
}

.page-header h1 {
    margin-bottom: 0.25rem;
    color: var(--primary-dark);
}

.page-header .subtitle {
    color: var(--gray-600);
    margin: 0;
    font-size: 0.95rem;
}

/* Card Styles */
.card {
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    overflow: hidden;
}

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

.card-header {
    background: linear-gradient(135deg, var(--gray-100) 0%, var(--gray-200) 100%);
    border-bottom: 2px solid var(--gray-300);
    padding: 0.5rem 1rem;
    font-weight: 500;
    border-top-left-radius: var(--radius-lg);
    border-top-right-radius: var(--radius-lg);
}

.card-body {
    padding: 1rem;
}

/* Stat Cards */
.stat-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 1rem;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    border-left: 4px solid var(--gray-400);
}

.stat-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.stat-card.primary { border-left-color: var(--primary-blue); }
.stat-card.success { border-left-color: var(--accent-green); }
.stat-card.warning { border-left-color: var(--accent-orange); }
.stat-card.danger { border-left-color: var(--accent-red); }
.stat-card.info { border-left-color: var(--accent-purple); }

.stat-card-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.stat-card.primary .stat-card-icon {
    background: linear-gradient(135deg, var(--primary-blue), #5AA3E8);
    color: white;
}

.stat-card.success .stat-card-icon {
    background: linear-gradient(135deg, var(--accent-green), #2ECC71);
    color: white;
}

.stat-card.warning .stat-card-icon {
    background: linear-gradient(135deg, var(--accent-orange), #F1C40F);
    color: white;
}

.stat-card.danger .stat-card-icon {
    background: linear-gradient(135deg, var(--accent-red), #EC7063);
    color: white;
}

.stat-card-value {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.125rem;
    color: var(--gray-900);
}

.stat-card-label {
    color: var(--gray-600);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 500;
}

/* Status Badges */
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.375rem 0.875rem;
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.status-badge i {
    font-size: 0.75rem;
}

.status-badge.online {
    background-color: rgba(39, 174, 96, 0.1);
    color: var(--status-online);
}

.status-badge.offline {
    background-color: rgba(149, 165, 166, 0.1);
    color: var(--status-offline);
}

.status-badge.warning {
    background-color: rgba(243, 156, 18, 0.1);
    color: var(--status-warning);
}

.status-badge.error {
    background-color: rgba(231, 76, 60, 0.1);
    color: var(--status-error);
}

/* Alert Improvements */
.alert {
    border: none;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: 0.75rem 1rem;
}

.alert i {
    margin-right: 0.5rem;
}

.alert-success {
    background-color: rgba(39, 174, 96, 0.1);
    color: var(--accent-green);
    border-left: 4px solid var(--accent-green);
}

.alert-danger {
    background-color: rgba(231, 76, 60, 0.1);
    color: var(--accent-red);
    border-left: 4px solid var(--accent-red);
}

.alert-warning {
    background-color: rgba(243, 156, 18, 0.1);
    color: var(--accent-orange);
    border-left: 4px solid var(--accent-orange);
}

.alert-info {
    background-color: rgba(74, 144, 226, 0.1);
    color: var(--primary-blue);
    border-left: 4px solid var(--primary-blue);
}

/* Button Improvements */
.btn {
    border-radius: var(--radius-md);
    padding: 0.3125rem 0.625rem;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    border: none;
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--primary-blue), #5AA3E8);
}

.btn-success {
    background: linear-gradient(135deg, var(--accent-green), #2ECC71);
}

.btn-danger {
    background: linear-gradient(135deg, var(--accent-red), #EC7063);
}

.btn-warning {
    background: linear-gradient(135deg, var(--accent-orange), #F1C40F);
}

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

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

/* Table Improvements */
.table-modern {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.table-modern thead {
    background: linear-gradient(135deg, var(--gray-100), var(--gray-200));
}

.table-modern thead th {
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.5px;
    color: var(--gray-700);
    border-bottom: 2px solid var(--gray-300);
    padding: 0.75rem 1rem;
}

.table-modern tbody tr {
    transition: background-color var(--transition-fast);
}

.table-modern tbody tr:hover {
    background-color: var(--gray-100);
}

.table-modern tbody td {
    padding: 0.75rem 1rem;
    vertical-align: middle;
}

/* Form Improvements */
.form-control {
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-md);
    padding: 0.375rem 0.75rem;
    transition: all var(--transition-fast);
}

.form-control:focus {
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 0.25rem rgba(74, 144, 226, 0.15);
}

.form-label {
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

/* Login/Signup Pages */
.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-dark) 0%, #2980B9 100%);
    padding: 1.5rem;
}

.auth-card {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    padding: 1.5rem;
    max-width: 420px;
    width: 100%;
}

.auth-header {
    text-align: center;
    margin-bottom: 1.25rem;
}

.auth-header .logo {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-blue), #5AA3E8);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 0.75rem;
    font-size: 1.5rem;
    color: white;
}

.auth-icon {
    font-size: 2rem;
    color: var(--primary-blue);
}

.auth-header h2 {
    color: var(--primary-dark);
    margin-bottom: 0.5rem;
}

.auth-header p {
    color: var(--gray-600);
    font-size: 0.95rem;
}

/* Utility Classes */
.text-primary { color: var(--primary-blue) !important; }
.text-success { color: var(--accent-green) !important; }
.text-warning { color: var(--accent-orange) !important; }
.text-danger { color: var(--accent-red) !important; }

.bg-light { background-color: var(--gray-100) !important; }

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

/* Responsive Improvements */
@media (max-width: 767px) {
    .main-content {
        padding: 1rem;
    }
    
    .page-header {
        padding: 1rem;
    }
    
    .stat-card {
        margin-bottom: 1rem;
    }
    
    .auth-card {
        padding: 1.25rem;
    }
}

/* Loading Spinner */
.spinner-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
}

.spinner-border {
    color: var(--primary-blue);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 1.5rem 1rem;
}

.empty-state i {
    font-size: 2.5rem;
    color: var(--gray-400);
    margin-bottom: 0.5rem;
}

.empty-state h3 {
    color: var(--gray-600);
}

.empty-state p {
    color: var(--gray-500);
    max-width: 400px;
    margin: 0 auto;
}