/* ============================================
   NMS — Technical Design System CSS
   Brutalist, Data-dense, Non-AI Aesthetic
   ============================================ */

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

/* ============================================
   CSS Custom Properties
   ============================================ */
:root {
    /* Colors — Strictly utilitarian */
    --bg-primary: #0F1115;
    --bg-panel: #16191E;
    --bg-surface: #1D2127;
    
    --border-subtle: #323842;
    --border-strong: #4A5568;

    --text-primary: #E2E8F0;
    --text-secondary: #94A3B8;
    --text-muted: #475569;

    /* Semantic colors */
    --green: #10B981;
    --red: #EF4444;
    --orange: #F59E0B;
    --blue: #3B82F6;

    /* Spacing - Dense */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;

    /* Border radius - Sharp */
    --radius-sm: 2px;
    --radius-md: 2px;
    --radius-lg: 2px;
    --radius-full: 9999px;

    /* Shadows - None or Hard offset */
    --shadow-sm: none;
    --shadow-md: none;
    --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.8);

    /* Transitions */
    --transition-fast: 100ms ease;

    /* Sidebar */
    --sidebar-width: 240px;
}

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

html {
    font-size: 14px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
}

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

a:hover {
    color: #60A5FA;
}

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

/* ---- Sidebar ---- */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-panel);
    border-right: 1px solid var(--border-subtle);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
}

.sidebar-brand {
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    height: 60px;
}

.sidebar-brand h1 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 0.05em;
    font-family: 'JetBrains Mono', monospace;
}

.sidebar-brand .brand-icon {
    width: 24px;
    height: 24px;
    background: var(--blue);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    border-radius: var(--radius-sm);
}

.sidebar-nav {
    flex: 1;
    padding: var(--space-md) 0;
    overflow-y: auto;
}

.nav-section {
    padding: var(--space-xs) var(--space-lg);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-top: var(--space-md);
    margin-bottom: var(--space-xs);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    color: var(--text-secondary);
    font-size: 0.85rem;
    transition: background var(--transition-fast);
    border-left: 3px solid transparent;
    cursor: pointer;
}

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

.nav-item.active {
    color: var(--text-primary);
    background: rgba(59, 130, 246, 0.1);
    border-left-color: var(--blue);
}

.nav-item .nav-icon {
    font-size: 1.1rem;
    width: 20px;
    text-align: center;
}

.sidebar-footer {
    padding: var(--space-md) var(--space-lg);
    border-top: 1px solid var(--border-subtle);
}

.sidebar-user {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.sidebar-user .user-avatar {
    width: 28px;
    height: 28px;
    background: var(--bg-surface);
    border: 1px solid var(--border-strong);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.75rem;
    color: var(--text-primary);
}

/* ---- Main content ---- */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: var(--space-xl);
    min-height: 100vh;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--border-subtle);
}

.page-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.page-header .header-actions {
    display: flex;
    gap: var(--space-sm);
}

/* ============================================
   Cards / Panels
   ============================================ */
.card {
    background: var(--bg-panel);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    padding: var(--space-md);
    transition: border-color var(--transition-fast);
}

.card:hover {
    border-color: var(--border-strong);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-md);
    border-bottom: 1px solid var(--border-subtle);
    padding-bottom: var(--space-xs);
}

.card-title {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

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

.stat-card {
    background: var(--bg-panel);
    border: 1px solid var(--border-subtle);
    border-left: 3px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    padding: var(--space-md);
    display: flex;
    flex-direction: column;
}

.stat-card.accent { border-left-color: var(--blue); }
.stat-card.green { border-left-color: var(--green); }
.stat-card.red { border-left-color: var(--red); }
.stat-card.yellow { border-left-color: var(--orange); }

.stat-card .stat-icon {
    font-size: 1.25rem;
    margin-bottom: var(--space-xs);
    color: var(--text-muted);
}

.stat-card .stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
    font-family: 'JetBrains Mono', monospace;
    margin-bottom: 4px;
}

.stat-card .stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ============================================
   Status badges
   ============================================ */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-family: 'JetBrains Mono', monospace;
}

.badge-up { background: rgba(16, 185, 129, 0.1); color: var(--green); border: 1px solid var(--green); }
.badge-down { background: rgba(239, 68, 68, 0.1); color: var(--red); border: 1px solid var(--red); }
.badge-unknown { background: rgba(71, 85, 105, 0.1); color: var(--text-muted); border: 1px solid var(--border-strong); }

/* ============================================
   Severity badges (logs)
   ============================================ */
.severity-critical { background: rgba(239, 68, 68, 0.1); color: var(--red); border: 1px solid var(--red); }
.severity-error { background: rgba(245, 158, 11, 0.1); color: var(--orange); border: 1px solid var(--orange); }
.severity-warning { background: rgba(245, 158, 11, 0.1); color: var(--orange); border: 1px solid var(--orange); }
.severity-info { background: rgba(59, 130, 246, 0.1); color: var(--blue); border: 1px solid var(--blue); }
.severity-debug { background: var(--bg-surface); color: var(--text-muted); border: 1px solid var(--border-subtle); }

/* ============================================
   Tables
   ============================================ */
.table-container {
    overflow-x: auto;
    border: 1px solid var(--border-subtle);
    background: var(--bg-panel);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8rem;
}

thead th {
    padding: var(--space-sm) var(--space-md);
    text-align: left;
    font-weight: 600;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-subtle);
    white-space: nowrap;
}

tbody td {
    padding: var(--space-sm) var(--space-md);
    border-bottom: 1px solid var(--border-subtle);
    color: var(--text-primary);
    vertical-align: middle;
}

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

td.mono {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 6px 12px;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: background var(--transition-fast);
    background: var(--bg-surface);
    color: var(--text-primary);
}

.btn:hover {
    background: var(--border-subtle);
    border-color: var(--border-strong);
}

.btn-primary {
    background: var(--blue);
    border: 1px solid var(--blue);
    color: white;
}

.btn-primary:hover {
    background: #2563EB; /* darker blue */
    border-color: #2563EB;
}

.btn-danger {
    background: rgba(239, 68, 68, 0.1);
    border-color: var(--red);
    color: var(--red);
}

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

.btn-sm {
    padding: 4px 8px;
    font-size: 0.75rem;
}

/* ============================================
   Forms
   ============================================ */
.form-group {
    margin-bottom: var(--space-md);
}

.form-label {
    display: block;
    margin-bottom: var(--space-xs);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.form-input {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-primary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    transition: border-color var(--transition-fast);
}

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

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2394a3b8' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

/* ============================================
   Dashboard Grids
   ============================================ */
.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.dashboard-grid-full {
    grid-column: 1 / -1;
}

/* ============================================
   Charts
   ============================================ */
.chart-container {
    position: relative;
    height: 250px;
    width: 100%;
    padding-top: var(--space-sm);
}

.chart-controls {
    display: flex;
    gap: var(--space-xs);
}

.chart-period {
    padding: 2px 8px;
    font-size: 0.7rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-subtle);
    background: var(--bg-surface);
    color: var(--text-secondary);
    cursor: pointer;
    font-family: inherit;
    transition: all var(--transition-fast);
}

.chart-period:hover,
.chart-period.active {
    background: rgba(59, 130, 246, 0.1);
    color: var(--blue);
    border-color: var(--blue);
}

/* ============================================
   Log Viewer
   ============================================ */
.log-filters {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
    flex-wrap: wrap;
    background: var(--bg-panel);
    padding: var(--space-md);
    border: 1px solid var(--border-subtle);
}

.log-filters .form-input,
.log-filters .form-select {
    min-width: 150px;
    flex: 1;
}

.log-message {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--text-primary);
    max-width: 600px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.log-time {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--text-muted);
    white-space: nowrap;
}

/* ============================================
   Login Page
   ============================================ */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
}

.login-card {
    width: 100%;
    max-width: 360px;
    background: var(--bg-panel);
    border: 1px solid var(--border-subtle);
    border-top: 3px solid var(--blue);
    padding: var(--space-xl);
}

.login-card .brand {
    margin-bottom: var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.login-card .brand-logo {
    width: 32px;
    height: 32px;
    background: var(--blue);
    color: white;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    border-radius: var(--radius-sm);
}

.login-card .brand h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
}

.login-error {
    padding: var(--space-sm);
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--red);
    color: var(--red);
    font-size: 0.8rem;
    margin-bottom: var(--space-md);
}

/* ============================================
   Modal / Dialog
   ============================================ */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: var(--bg-panel);
    border: 1px solid var(--border-subtle);
    padding: var(--space-lg);
    width: 100%;
    max-width: 560px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
    border-bottom: 1px solid var(--border-subtle);
    padding-bottom: var(--space-sm);
}

.modal-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.2rem;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.modal-close:hover {
    color: var(--text-primary);
}

/* ============================================
   Empty States
   ============================================ */
.empty-state {
    text-align: center;
    padding: var(--space-xl);
    color: var(--text-muted);
    border: 1px dashed var(--border-strong);
    background: var(--bg-primary);
}

.empty-state .empty-icon {
    font-size: 2rem;
    margin-bottom: var(--space-sm);
}

.empty-state h3 {
    font-size: 0.9rem;
    color: var(--text-secondary);
}