/**
 * Nightingale Server Monitoring - Base CSS
 * 
 * Core styles and CSS variables used throughout the application.
 * This file contains the foundation styles that other components build upon.
 * 
 * @author Nightingale Team
 * @version 1.0.0
 */

/* ============================================
   CSS Variables & Root Configuration - Custodia UK Color Scheme
   ============================================ */
:root {
    /* Primary Colors from the design system */
    --color-warm-orange: #FF7F4F;
    --color-nice-blue: #4A9FCC;
    --color-light-orange: #FFC299;
    --color-dark-orange: #FF5722;
    --color-light-blue: #87CEEB;
    --color-dark-blue: #2980B9;
    
    /* Neutral Colors */
    --color-off-white: #FAFAFA;
    --color-light-gray: #E0E0E0;
    --color-medium-gray: #757575;
    --color-dark-gray: #424242;
    
    /* System Colors */
    --color-primary: var(--color-nice-blue);
    --color-secondary: var(--color-warm-orange);
    --color-success: #27ae60;
    --color-danger: #e74c3c;
    --color-warning: #f39c12;
    --color-info: var(--color-light-blue);
    
    /* Text Colors */
    --color-text: var(--color-dark-gray);
    --color-text-muted: var(--color-medium-gray);
    --color-background: var(--color-off-white);
    --color-background-alt: #ffffff;
    
    /* Border Colors */
    --color-border: var(--color-light-gray);
    
    /* Styling Properties */
    --border-radius: 6px;
    --border-radius-lg: 12px;
    --box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --box-shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);
    
    /* Animation Properties */
    --transition: all 0.3s ease;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    
    /* Spacing Units */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 50%;
    
    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 20px rgba(0,0,0,0.15);
    --shadow-xl: 0 20px 40px rgba(0,0,0,0.2);
}

/* Dark Theme Support */
@media (prefers-color-scheme: dark) {
    :root {
        --color-background: #1a1a1a;
        --color-background-alt: #2d2d2d;
        --color-text: #e0e0e0;
        --color-border: #404040;
    }
}

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

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.5;
    color: var(--color-text);
    background: var(--color-background);
}

h1, h2, h3, h4, h5, h6 {
    margin-bottom: var(--spacing-md);
    font-weight: 600;
    line-height: 1.2;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }
h6 { font-size: 1rem; }

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* ============================================
   Critical App Layout
   ============================================ */
.app-layout {
    display: flex;
    min-height: 100vh;
}

.app-layout .sidebar {
    width: 260px;
    background: var(--color-dark-gray);
    color: white;
    padding: 0;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    z-index: 1001;
    top: 0;
    left: 0;
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-primary), var(--color-dark-blue));
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    flex-shrink: 0;
}

.app-title a {
    color: white;
    text-decoration: none;
    font-size: 1.3em;
    font-weight: 600;
}

.app-version {
    margin-top: 5px;
    font-size: 0.8em;
    opacity: 0.7;
    font-weight: 400;
}

.sidebar-menu {
    flex: 1;
    padding: 0;
}

.menu-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    transition: var(--transition);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    font-weight: 500;
    font-size: 0.9rem;
}

.menu-item:hover,
.menu-item:focus {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    outline: none;
    text-decoration: none;
}

.menu-item.active {
    background: var(--color-primary);
    color: white;
    border-left: 4px solid var(--color-secondary);
}

.menu-icon {
    width: 16px;
    font-size: 14px;
    text-align: center;
    flex-shrink: 0;
    color: rgba(255, 255, 255, 0.8);
}

.menu-item.active .menu-icon {
    color: white;
}

/* Expandable Menu Styles */
.menu-item-group {
    position: relative;
}

.menu-toggle {
    background: none;
    border: none;
    width: 100%;
    text-align: left;
    cursor: pointer;
    position: relative;
}

.menu-arrow {
    position: absolute;
    right: 20px;
    font-size: 12px;
    transition: transform var(--transition);
    color: rgba(255, 255, 255, 0.7);
}

.menu-toggle.expanded .menu-arrow {
    transform: rotate(180deg);
}

.submenu-container {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition);
    background: rgba(0, 0, 0, 0.2);
}

.submenu-container.expanded {
    max-height: 500px;
}

.submenu-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 20px 10px 40px;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition);
    font-size: 0.9em;
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.submenu-item:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    text-decoration: none;
}

.submenu-item.active {
    background: var(--color-primary);
    color: white;
}

.submenu-icon {
    width: 16px;
    text-align: center;
    font-size: 12px;
    flex-shrink: 0;
}

.submenu-divider {
    height: 1px;
    background: rgba(255, 255, 255, 0.1);
    margin: 8px 20px 8px 40px;
}

.server-item .submenu-text {
    font-size: 0.85em;
}

.sidebar-footer {
    padding: 15px 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(0, 0, 0, 0.1);
}

.main-container {
    flex: 1;
    margin-left: 260px;
    padding: var(--spacing-xl);
    min-height: 100vh;
    background: var(--color-background);
}

/* ============================================
   Login Page Styles
   ============================================ */
.login-container {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    min-height: 100vh;
    position: relative;
    padding-right: 80px;
    background-image: 
        linear-gradient(rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.3)),
        url('../images/background1.webp');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

/* Alternate background images for variety */
.login-container.bg-variant-2 {
    background-image: 
        linear-gradient(rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.3)),
        url('../images/background2.webp');
}

.login-container.bg-variant-3 {
    background-image: 
        linear-gradient(rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.3)),
        url('../images/background3.webp');
}

.login-box {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 50px;
    border-radius: var(--border-radius-lg);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    width: 100%;
    max-width: 450px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.login-header {
    text-align: center;
    margin-bottom: 35px;
}

.login-header h1 {
    color: var(--color-text);
    margin-bottom: 8px;
    font-size: 2.2em;
    font-weight: 700;
}

.login-header p {
    color: var(--color-text-muted);
    font-size: 1em;
    font-weight: 500;
}

/* Login Form Improvements */
.login-content .form-group {
    margin-bottom: 20px;
}

.login-content .form-group:last-child {
    margin-top: 30px;
    margin-bottom: 0;
}

.login-content .btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-dark-blue) 100%);
    border: none;
    padding: 16px 24px;
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    border-radius: 8px;
    transition: all 0.3s ease;
    text-transform: uppercase;
    box-shadow: 0 4px 15px rgba(74, 159, 204, 0.3);
}

.login-content .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(74, 159, 204, 0.4);
    background: linear-gradient(135deg, #5ba9d0 0%, #3a7bd5 100%);
}

.login-content .btn-primary:active {
    transform: translateY(0);
    box-shadow: 0 2px 10px rgba(74, 159, 204, 0.3);
}

/* Login Error Alert Styling */
.login-content .alert-error {
    background: rgba(231, 76, 60, 0.1);
    border: 1px solid rgba(231, 76, 60, 0.3);
    border-radius: 8px;
    padding: 12px 16px;
    margin-bottom: 20px;
    color: var(--color-danger);
    font-weight: 500;
    backdrop-filter: blur(5px);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .login-container {
        justify-content: center;
        padding: 20px;
        background-attachment: scroll;
    }
    
    .login-box {
        padding: 30px;
        max-width: 90%;
    }
}

/* ============================================
   Grid Layouts
   ============================================ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.dashboard-layout {
    display: grid;
    grid-template-columns: 2fr 350px;
    gap: var(--spacing-xl);
}

.server-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.metric-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

/* Responsive Grid Adjustments */
@media (max-width: 768px) {
    .dashboard-layout {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Card Components
   ============================================ */
.card {
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.stat-card {
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: center;
    position: relative;
    overflow: hidden;
    min-height: 120px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--color-primary);
}

.server-card {
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}

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

.content-card {
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.content-card-header {
    background: var(--color-background-alt);
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 60px;
}

.content-card-body {
    padding: var(--spacing-lg);
    min-height: 80px;
}

/* ============================================
   Status Indicators & Badges
   ============================================ */
.badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
    font-weight: 600;
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
    border-radius: var(--radius-sm);
}

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

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

.badge-warning {
    background-color: var(--color-warning);
    color: #212529;
}

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

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

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

/* Status-specific card modifiers */
.stat-success::before { background: var(--color-success); }
.stat-error::before, .stat-danger::before { background: var(--color-danger); }
.stat-warning::before { background: var(--color-warning); }
.stat-info::before { background: var(--color-info); }
.stat-critical::before { 
    background: var(--color-danger);
    animation: pulse 2s infinite;
}

/* ============================================
   Stat Values & Labels
   ============================================ */
.stat-value {
    font-size: 2.5em;
    font-weight: bold;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
    line-height: 1;
}

.stat-label {
    font-size: 0.9em;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.stat-trend {
    font-size: 0.75em;
    color: var(--color-text-muted);
    opacity: 0.8;
}

/* Colored stat values */
.stat-success .stat-value { color: var(--color-success); }
.stat-error .stat-value, .stat-danger .stat-value { color: var(--color-danger); }
.stat-warning .stat-value { color: var(--color-warning); }
.stat-info .stat-value { color: var(--color-primary); }
.stat-critical .stat-value { color: var(--color-danger); }

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1.5;
    text-align: center;
    text-decoration: none;
    white-space: nowrap;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn:active {
    transform: translateY(0);
}

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

.btn-primary:hover {
    background-color: #3d8ab8;
    border-color: #3d8ab8;
}

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

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

.btn-warning {
    background-color: var(--color-warning);
    border-color: var(--color-warning);
    color: #212529;
}

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

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

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

.btn-small {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1rem;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ============================================
   Tables
   ============================================ */
.data-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-background);
}

.data-table thead {
    background: var(--color-background-alt);
}

.data-table th {
    padding: var(--spacing-md) var(--spacing-md);
    text-align: left;
    font-weight: 600;
    color: var(--color-text-muted);
    border-bottom: 2px solid var(--color-border);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: var(--color-background-alt);
}

.data-table td {
    padding: var(--spacing-md) var(--spacing-md);
    border-bottom: 1px solid var(--color-border-light);
    vertical-align: middle;
}

.data-table tbody tr:hover {
    background: var(--color-background-alt);
    cursor: pointer;
    transform: translateY(-1px);
    transition: all var(--transition-fast);
}

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

/* Responsive table wrapper */
.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

/* ============================================
   Animations
   ============================================ */
@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.5; }
    100% { opacity: 1; }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
    from { transform: translateX(-100%); }
    to { transform: translateX(0); }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ============================================
   Loading States
   ============================================ */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--color-border);
    border-radius: 50%;
    border-top-color: var(--color-primary);
    animation: spin 1s linear infinite;
}

.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

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

.text-muted { color: var(--color-text-muted); }
.text-success { color: var(--color-success); }
.text-danger { color: var(--color-danger); }
.text-warning { color: var(--color-warning); }
.text-info { color: var(--color-info); }

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }

.p-1 { padding: var(--spacing-sm); }
.p-2 { padding: var(--spacing-md); }
.p-3 { padding: var(--spacing-lg); }

.d-none { display: none; }
.d-block { display: block; }
.d-inline-block { display: inline-block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

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

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

.flex-column {
    display: flex;
    flex-direction: column;
}

/* ============================================
   Responsive Utilities
   ============================================ */
@media (max-width: 576px) {
    .hide-mobile { display: none; }
}

@media (min-width: 577px) and (max-width: 768px) {
    .hide-tablet { display: none; }
}

@media (min-width: 769px) {
    .hide-desktop { display: none; }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .no-print { display: none !important; }
    
    body {
        font-size: 12pt;
        color: #000;
        background: #fff;
    }
    
    a { color: #000; }
}