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

:root {
    --primary: #0f172a;
    --surface: #1e293b;
    --surface-hover: #253348;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --border: #334155;
    --accent: #3b82f6;
    --accent-light: #60a5fa;
    --accent-glow: rgba(59, 130, 246, 0.15);
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --radius: 8px;
}

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

body::before {
    content: '';
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image:
        linear-gradient(rgba(59, 130, 246, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59, 130, 246, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
    z-index: 0;
}

/* --- Layout --- */

.app {
    position: relative;
    z-index: 1;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(8px);
    position: sticky;
    top: 0;
    z-index: 10;
}

.topbar .logo {
    font-size: 20px;
    font-weight: 800;
    letter-spacing: -0.5px;
    text-decoration: none;
    color: var(--text);
}

.topbar .logo span { color: var(--accent); }

.topbar-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.topbar-user {
    color: var(--text-muted);
    font-size: 14px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    font-size: 14px;
    cursor: pointer;
    transition: background 0.15s;
    text-decoration: none;
}

.btn:hover { background: var(--surface-hover); }
.btn-primary { background: var(--accent); border-color: var(--accent); }
.btn-primary:hover { background: #2563eb; }
.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-danger { color: var(--danger); }
.btn-danger:hover { background: rgba(239, 68, 68, 0.1); }

.main {
    max-width: 1100px;
    margin: 0 auto;
    padding: 24px;
}

/* --- Tabs --- */

.tabs {
    display: flex;
    gap: 4px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 24px;
}

.tab {
    padding: 10px 20px;
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: color 0.15s, border-color 0.15s;
    background: none;
    border-top: none;
    border-left: none;
    border-right: none;
}

.tab:hover { color: var(--text); }
.tab.active { color: var(--accent-light); border-bottom-color: var(--accent); }

/* --- Cards --- */

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    transition: border-color 0.15s;
}

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

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.card-title {
    font-size: 16px;
    font-weight: 600;
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
}

.status-dot.online { background: var(--success); box-shadow: 0 0 6px var(--success); }
.status-dot.offline { background: var(--danger); box-shadow: 0 0 6px var(--danger); }
.status-dot.unknown { background: var(--text-muted); }

.card-meta {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.meta-row {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
}

.meta-label { color: var(--text-muted); }
.meta-value { font-weight: 500; font-family: 'SF Mono', 'Fira Code', monospace; }

/* --- Resource Bars --- */

.bar-container {
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    overflow: hidden;
    margin-top: 4px;
}

.bar {
    height: 100%;
    border-radius: 3px;
    transition: width 0.3s;
}

.bar.ok { background: var(--success); }
.bar.warn { background: var(--warning); }
.bar.crit { background: var(--danger); }

/* --- Table --- */

.table-wrap {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

th {
    text-align: left;
    padding: 12px 16px;
    color: var(--text-muted);
    font-weight: 500;
    font-size: 13px;
    border-bottom: 1px solid var(--border);
    background: rgba(0, 0, 0, 0.15);
}

td {
    padding: 10px 16px;
    border-bottom: 1px solid rgba(51, 65, 85, 0.5);
}

tr:last-child td { border-bottom: none; }
tr:hover td { background: rgba(59, 130, 246, 0.05); }

/* --- Status Badges --- */

.badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.badge-ok { background: rgba(34, 197, 94, 0.15); color: var(--success); }
.badge-warn { background: rgba(245, 158, 11, 0.15); color: var(--warning); }
.badge-err { background: rgba(239, 68, 68, 0.15); color: var(--danger); }

/* --- Login --- */

.login-wrap {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 24px;
}

.login-box {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 40px;
    width: 100%;
    max-width: 400px;
}

.login-box h1 {
    font-size: 24px;
    margin-bottom: 8px;
}

.login-box .subtitle {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 28px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 6px;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 10px 14px;
    background: var(--primary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-size: 15px;
    outline: none;
    transition: border-color 0.15s;
}

.form-group input:focus { border-color: var(--accent); }

.login-error {
    color: var(--danger);
    font-size: 13px;
    margin-bottom: 12px;
    display: none;
}

.login-box .btn-primary {
    width: 100%;
    padding: 12px;
    font-size: 15px;
    font-weight: 600;
    justify-content: center;
}

/* --- Empty State --- */

.empty {
    text-align: center;
    padding: 60px 24px;
    color: var(--text-muted);
}

.empty-icon {
    font-size: 40px;
    margin-bottom: 12px;
    opacity: 0.4;
}

/* --- Responsive --- */

@media (max-width: 640px) {
    .topbar { padding: 12px 16px; }
    .main { padding: 16px; }
    .cards { grid-template-columns: 1fr; }
    .login-box { padding: 28px 24px; }
}