/* ============================================
   VPN Monitoring Dashboard - Styles
   Современный тёмный стиль в стиле starconnect.pro
   Версия: 1.0
   ============================================ */

/* ============================================
   CSS VARIABLES
   ============================================ */
:root {
    /* Цветовая палитра - тёмная тема */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --bg-hover: #334155;
    
    /* Текст */
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    /* Акценты */
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #06b6d4;
    
    /* Статусы */
    --status-ok: #10b981;
    --status-warning: #f59e0b;
    --status-critical: #ef4444;
    
    /* Границы */
    --border-color: #334155;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    
    /* Тени */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    
    /* Отступы */
    --container-max-width: 1400px;
    --header-height: 64px;
}

/* ============================================
   RESET & BASE
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.2s;
}

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

/* ============================================
   HEADER
   ============================================ */
.header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    height: var(--header-height);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.25rem;
    font-weight: 600;
}

.logo-icon {
    font-size: 1.5rem;
}

.nav {
    display: flex;
    gap: 8px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: var(--border-radius-sm);
    color: var(--text-secondary);
    transition: all 0.2s;
}

.nav-link:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.nav-link.active {
    background-color: var(--primary);
    color: white;
}

.nav-icon {
    font-size: 1.1rem;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-info {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ============================================
   MAIN CONTENT
   ============================================ */
.main {
    padding: 32px 0;
    min-height: calc(100vh - var(--header-height) - 100px);
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
}

/* ============================================
   STATS GRID
   ============================================ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    border: 1px solid var(--border-color);
    transition: transform 0.2s, box-shadow 0.2s;
}

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

.stat-icon {
    font-size: 2.5rem;
}

.stat-content {
    flex: 1;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 4px;
}

.stat-card.stat-ok .stat-value { color: var(--success); }
.stat-card.stat-warning .stat-value { color: var(--warning); }
.stat-card.stat-critical .stat-value { color: var(--danger); }
.stat-card.stat-info .stat-value { color: var(--info); }

/* ============================================
   ALERTS
   ============================================ */
.alerts-section {
    margin-bottom: 32px;
}

.alerts-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.alert-card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 16px 20px;
    border-left: 4px solid;
    transition: transform 0.2s;
}

.alert-card:hover {
    transform: translateX(4px);
}

.alert-card.alert-critical {
    border-left-color: var(--danger);
}

.alert-card.alert-warning {
    border-left-color: var(--warning);
}

.alert-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.alert-icon {
    font-size: 1.2rem;
}

.alert-server {
    font-weight: 600;
    color: var(--text-primary);
}

.alert-time {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-left: auto;
}

.alert-message {
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.alert-metrics {
    display: flex;
    gap: 16px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.alert-metrics span {
    background: var(--bg-hover);
    padding: 4px 12px;
    border-radius: 20px;
}

/* ============================================
   TABLES
   ============================================ */
.table-container {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    overflow: hidden;
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

thead {
    background: var(--bg-hover);
}

th {
    padding: 14px 16px;
    text-align: left;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

td {
    padding: 14px 16px;
    border-top: 1px solid var(--border-color);
    color: var(--text-primary);
}

tbody tr {
    transition: background-color 0.2s;
}

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

/* Servers Table Specific */
.server-row.server-ok { border-left: 3px solid var(--success); }
.server-row.server-warning { border-left: 3px solid var(--warning); }
.server-row.server-critical { border-left: 3px solid var(--danger); }

.status-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    font-weight: 600;
    font-size: 0.9rem;
}

.status-ok {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success);
}

.status-warning {
    background: rgba(245, 158, 11, 0.2);
    color: var(--warning);
}

.status-critical {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger);
}

.type-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    text-transform: capitalize;
    background: var(--bg-hover);
    color: var(--text-secondary);
}

.country-flag {
    font-size: 1.2rem;
}

.ping-value, .http-value {
    font-family: 'Monaco', 'Consolas', monospace;
    font-size: 0.9rem;
}

.http-time {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.failure-count {
    background: var(--danger);
    color: white;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 600;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    text-decoration: none;
}

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

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

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

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

.btn-sm {
    padding: 6px 12px;
    font-size: 0.85rem;
}

.btn-block {
    width: 100%;
}

/* ============================================
   LOGIN PAGE
   ============================================ */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.login-container {
    width: 100%;
    max-width: 420px;
    padding: 20px;
}

.login-card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 40px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
}

.login-header {
    text-align: center;
    margin-bottom: 32px;
}

.login-icon {
    font-size: 4rem;
    display: block;
    margin-bottom: 16px;
}

.login-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.login-header p {
    color: var(--text-secondary);
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.form-group input {
    padding: 12px 16px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
}

.form-error {
    color: var(--danger);
    font-size: 0.9rem;
    display: none;
    padding: 12px;
    background: rgba(239, 68, 68, 0.1);
    border-radius: var(--border-radius-sm);
}

.login-footer {
    margin-top: 24px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ============================================
   SERVER DETAIL
   ============================================ */
.server-header {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 24px;
    margin-bottom: 32px;
    border: 1px solid var(--border-color);
}

.server-header-content {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.server-header h1 {
    font-size: 1.75rem;
    margin: 0;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}

.info-card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 20px;
    border: 1px solid var(--border-color);
}

.info-label {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 8px;
}

.info-value {
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 600;
}

/* Charts */
.charts-section {
    margin-bottom: 32px;
}

.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 20px;
}

.chart-card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 24px;
    border: 1px solid var(--border-color);
}

.chart-card h3 {
    margin-bottom: 20px;
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* Uptime */
.uptime-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 12px;
}

.uptime-card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 16px;
    border: 1px solid var(--border-color);
    text-align: center;
}

.uptime-date {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.uptime-value {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.uptime-card.uptime-high .uptime-value { color: var(--success); }
.uptime-card.uptime-medium .uptime-value { color: var(--warning); }
.uptime-card.uptime-low .uptime-value { color: var(--danger); }

.uptime-details {
    display: flex;
    justify-content: center;
    gap: 12px;
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Error Section */
.error-section {
    margin-bottom: 32px;
}

.error-card {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--danger);
    border-radius: var(--border-radius);
    padding: 20px;
}

.error-time {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 8px;
}

.error-message {
    color: var(--danger);
    font-family: monospace;
}

/* History Table */
.history-row.ok { border-left: 3px solid var(--success); }
.history-row.error { border-left: 3px solid var(--danger); }

.error-cell {
    color: var(--text-muted);
    font-size: 0.85rem;
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ============================================
   ALERTS PAGE
   ============================================ */
.page-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 24px;
}

.alerts-filters {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

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

.alerts-table-full {
    min-width: 1000px;
}

.alert-row-full td {
    vertical-align: middle;
}

.alert-type-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.alert-type-badge.alert-type-critical {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger);
}

.alert-type-badge.alert-type-warning {
    background: rgba(245, 158, 11, 0.2);
    color: var(--warning);
}

.alert-type-badge.alert-type-recovered {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success);
}

.category-badge {
    display: inline-block;
    padding: 2px 8px;
    background: var(--bg-hover);
    border-radius: 4px;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.alert-title {
    font-weight: 500;
}

.alert-message-cell {
    color: var(--text-secondary);
    font-size: 0.85rem;
    max-width: 400px;
}

.resolved-info {
    margin-top: 4px;
    color: var(--text-muted);
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
}

.empty-icon {
    font-size: 4rem;
    display: block;
    margin-bottom: 16px;
}

.empty-state h3 {
    font-size: 1.25rem;
    margin-bottom: 8px;
}

.empty-state p {
    color: var(--text-secondary);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 24px 0;
    margin-top: 48px;
}

.footer p {
    color: var(--text-secondary);
    text-align: center;
    font-size: 0.9rem;
}

.footer-note {
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-top: 8px;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    .header-content {
        flex-wrap: wrap;
        height: auto;
        padding: 12px 0;
    }
    
    .nav {
        order: 3;
        width: 100%;
        margin-top: 12px;
        justify-content: center;
    }
    
    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .charts-grid {
        grid-template-columns: 1fr;
    }
    
    .table-container {
        overflow-x: auto;
    }
    
    table {
        min-width: 800px;
    }
}

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

.status-critical .status-badge {
    animation: pulse 2s infinite;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-hover);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-color);
}