/* ==========================================================
   VektraWeb Core & AI Guardian — Design System
   Modern Dark Architecture UI
   ========================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Color Palette */
    --bg-main: #07090e;
    --bg-surface: #0d121d;
    --bg-card: #121826;
    --bg-card-hover: #172033;
    --bg-card-glass: rgba(18, 24, 38, 0.75);

    --border-color: rgba(255, 255, 255, 0.08);
    --border-light: rgba(255, 255, 255, 0.14);
    --border-accent: rgba(59, 130, 246, 0.4);

    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    /* Semantics */
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --primary-glow: rgba(59, 130, 246, 0.25);

    --success: #10b981;
    --success-bg: rgba(16, 185, 129, 0.12);
    --success-border: rgba(16, 185, 129, 0.25);

    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.12);
    --warning-border: rgba(245, 158, 11, 0.25);

    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.12);
    --danger-border: rgba(239, 68, 68, 0.25);

    --info: #06b6d4;
    --info-bg: rgba(6, 182, 212, 0.12);

    --ai-purple: #8b5cf6;
    --ai-purple-glow: rgba(139, 92, 246, 0.3);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 9999px;

    --shadow-card: 0 4px 20px -2px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 25px rgba(59, 130, 246, 0.15);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* Layout */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--bg-surface);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: all 0.25s ease;
    z-index: 100;
}

.brand {
    padding: 24px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border-color);
}

.brand-icon {
    width: 38px;
    height: 38px;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    color: #fff;
    box-shadow: 0 0 15px var(--primary-glow);
}

.brand-info h2 {
    font-size: 15px;
    font-weight: 700;
    letter-spacing: -0.3px;
    color: #fff;
}

.brand-info span {
    font-size: 11px;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-menu {
    padding: 16px 12px;
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.nav-heading {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    padding: 12px 10px 6px 10px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-size: 13.5px;
    font-weight: 500;
    transition: all 0.15s ease;
}

.nav-item:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: #fff;
}

.nav-item.active {
    background: linear-gradient(90deg, rgba(59, 130, 246, 0.15), rgba(59, 130, 246, 0.04));
    color: #60a5fa;
    border-left: 3px solid #3b82f6;
    font-weight: 600;
}

.nav-item svg {
    width: 18px;
    height: 18px;
    opacity: 0.8;
}

.nav-item.active svg {
    opacity: 1;
    color: #60a5fa;
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border-color);
    background: rgba(0, 0, 0, 0.2);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: #1e293b;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: #94a3b8;
    font-size: 13px;
}

.user-meta {
    flex: 1;
    overflow: hidden;
}

.user-name {
    font-size: 13px;
    font-weight: 600;
    color: #fff;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-role {
    font-size: 11px;
    color: var(--text-muted);
}

/* Main Content Area */
.main-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    background-color: var(--bg-main);
}

.top-header {
    height: 64px;
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 28px;
    position: sticky;
    top: 0;
    z-index: 90;
}

.page-title h1 {
    font-size: 18px;
    font-weight: 700;
    color: #fff;
    letter-spacing: -0.3px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.content-body {
    padding: 28px;
    flex: 1;
}

/* KPI Cards Grid */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 28px;
}

.kpi-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    position: relative;
    transition: transform 0.2s ease, border-color 0.2s ease;
    box-shadow: var(--shadow-card);
}

.kpi-card:hover {
    transform: translateY(-2px);
    border-color: var(--border-light);
}

.kpi-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.kpi-title {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.kpi-icon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.05);
}

.kpi-value {
    font-size: 26px;
    font-weight: 700;
    color: #fff;
    font-family: var(--font-sans);
    line-height: 1.1;
}

.kpi-meta {
    font-size: 12px;
    margin-top: 8px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
}

/* Status Indicators */
.status-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 3px 10px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 600;
}

.status-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
}

.status-healthy {
    background: var(--success-bg);
    color: #34d399;
    border: 1px solid var(--success-border);
}

.status-healthy .status-dot {
    background-color: var(--success);
    box-shadow: 0 0 8px #10b981;
}

.status-warning {
    background: var(--warning-bg);
    color: #fbbf24;
    border: 1px solid var(--warning-border);
}

.status-warning .status-dot {
    background-color: var(--warning);
    box-shadow: 0 0 8px #f59e0b;
}

.status-critical {
    background: var(--danger-bg);
    color: #f87171;
    border: 1px solid var(--danger-border);
}

.status-critical .status-dot {
    background-color: var(--danger);
    box-shadow: 0 0 8px #ef4444;
}

.status-unknown {
    background: rgba(148, 163, 184, 0.1);
    color: #94a3b8;
    border: 1px solid rgba(148, 163, 184, 0.2);
}

.status-unknown .status-dot {
    background-color: #94a3b8;
}

/* Cards & Panels */
.panel {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    overflow: hidden;
    margin-bottom: 28px;
}

.panel-header {
    padding: 18px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.panel-header h3 {
    font-size: 15px;
    font-weight: 700;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 10px;
}

.panel-body {
    padding: 24px;
}

/* Data Tables */
.table-responsive {
    width: 100%;
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13.5px;
    text-align: left;
}

.data-table th {
    background: rgba(255, 255, 255, 0.02);
    color: var(--text-muted);
    font-weight: 600;
    font-size: 11.5px;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    padding: 12px 18px;
    border-bottom: 1px solid var(--border-color);
}

.data-table td {
    padding: 14px 18px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
    vertical-align: middle;
}

.data-table tbody tr {
    transition: background 0.15s ease;
}

.data-table tbody tr:hover {
    background-color: rgba(255, 255, 255, 0.02);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.15s ease;
    font-family: inherit;
}

.btn-primary {
    background-color: var(--primary);
    color: #fff;
    box-shadow: 0 0 12px var(--primary-glow);
}

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

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
}

.btn-success {
    background: var(--success);
    color: #fff;
}

.btn-success:hover {
    background: #059669;
}

.btn-danger {
    background: var(--danger);
    color: #fff;
}

.btn-sm {
    padding: 5px 10px;
    font-size: 12px;
}

/* Forms & Inputs */
.form-group {
    margin-bottom: 18px;
}

.form-label {
    display: block;
    font-size: 12.5px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    background: #0b0f19;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: #fff;
    font-size: 13.5px;
    font-family: inherit;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

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

/* Grid layout for cards */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

@media (max-width: 900px) {
    .grid-2 {
        grid-template-columns: 1fr;
    }

    .sidebar {
        width: 70px;
    }

    .brand-info,
    .nav-item span,
    .nav-heading,
    .user-meta {
        display: none;
    }

    .brand {
        justify-content: center;
        padding: 20px 0;
    }

    .sidebar-footer {
        padding: 12px 0;
        display: flex;
        justify-content: center;
    }
}

/* Flash alerts */
.alert {
    padding: 12px 18px;
    border-radius: var(--radius-sm);
    font-size: 13.5px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-success {
    background: var(--success-bg);
    color: #34d399;
    border: 1px solid var(--success-border);
}

.alert-error {
    background: var(--danger-bg);
    color: #f87171;
    border: 1px solid var(--danger-border);
}

.alert-info {
    background: var(--info-bg);
    color: #38bdf8;
    border: 1px solid rgba(6, 182, 212, 0.3);
}

/* AI Badge */
.badge-ai {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(59, 130, 246, 0.2));
    border: 1px solid rgba(139, 92, 246, 0.4);
    color: #c084fc;
    font-size: 11px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}