:root {
    /* Cores Premium NOC Dark Theme */
    --bg-base: #06090f;
    --bg-panel: #0d121c;
    --bg-panel-hover: #161e2e;
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #475569;
    
    --accent: #38bdf8;
    --accent-glow: rgba(56, 189, 248, 0.2);
    
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #06b6d4;
    
    --border: #1e293b;
    --font-main: 'Inter', sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: var(--font-main); }
body { background: var(--bg-base); color: var(--text-primary); font-size: 14px; overflow: hidden; }

/* Screens */
.screen { display: none; width: 100vw; height: 100vh; }
.screen.active { display: flex; }

/* =========================================
   LOGIN SCREEN
========================================= */
#login-screen { align-items: center; justify-content: center; background: radial-gradient(circle at center, #0d121c 0%, #06090f 100%); }
.login-box { background: var(--bg-panel); padding: 40px; border-radius: 12px; width: 100%; max-width: 400px; border: 1px solid var(--border); box-shadow: 0 10px 30px rgba(0,0,0,0.5); }
.login-logo { text-align: center; margin-bottom: 30px; }
.login-logo .nexus { color: var(--text-primary); font-weight: 700; font-size: 28px; }
.login-logo .like { color: var(--accent); font-weight: 300; font-size: 28px; }
.subtitle { color: var(--text-secondary); font-size: 12px; letter-spacing: 2px; text-transform: uppercase; margin-top: 5px; }

.input-group { margin-bottom: 20px; }
.input-group label { display: block; color: var(--text-secondary); margin-bottom: 8px; font-size: 12px; text-transform: uppercase; letter-spacing: 1px; }
.input-group input { width: 100%; padding: 12px 16px; background: rgba(0,0,0,0.2); border: 1px solid var(--border); border-radius: 6px; color: #fff; font-size: 14px; transition: 0.3s; }
.input-group input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }

.btn-primary { width: 100%; padding: 14px; background: var(--accent); color: #fff; border: none; border-radius: 6px; font-weight: 600; cursor: pointer; transition: 0.3s; font-size: 14px; }
.btn-primary:hover { background: #0ea5e9; transform: translateY(-1px); }

.error-msg { color: var(--danger); font-size: 13px; text-align: center; margin-bottom: 15px; min-height: 20px; }

/* =========================================
   APP LAYOUT
========================================= */
.sidebar { width: 280px; background: var(--bg-panel); border-right: 1px solid var(--border); display: flex; flex-direction: column; }
.sidebar .logo { padding: 25px; border-bottom: 1px solid var(--border); }
.sidebar .nexus { font-weight: 700; font-size: 22px; }
.sidebar .like { color: var(--accent); font-weight: 300; font-size: 22px; }

#main-nav { flex: 1; padding: 20px 0; overflow-y: auto; }
.nav-category { padding: 15px 25px 5px; font-size: 11px; color: var(--text-muted); text-transform: uppercase; font-weight: 600; letter-spacing: 1px; }
#main-nav a { display: block; padding: 12px 25px; color: var(--text-secondary); text-decoration: none; transition: 0.2s; border-left: 3px solid transparent; }
#main-nav a:hover { color: var(--text-primary); background: rgba(255,255,255,0.02); }
#main-nav a.active { color: var(--accent); background: var(--bg-panel-hover); border-left-color: var(--accent); }

.sidebar-footer { padding: 20px; border-top: 1px solid var(--border); }
.btn-outline { width: 100%; padding: 10px; background: transparent; border: 1px solid var(--border); color: var(--text-secondary); border-radius: 6px; cursor: pointer; transition: 0.2s; }
.btn-outline:hover { background: rgba(255,255,255,0.05); color: #fff; }

.main-content { flex: 1; display: flex; flex-direction: column; background: var(--bg-base); }
.topbar { height: 70px; padding: 0 30px; border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; background: var(--bg-panel); }
.topbar h1 { font-size: 18px; font-weight: 500; color: var(--text-primary); }

.status-indicator { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-secondary); }
.dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }
.dot.success { background: var(--success); }
.dot.pulse { background: var(--success); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); animation: pulse 2s infinite; }

@keyframes pulse {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
    70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

/* =========================================
   DASHBOARD CONTENT
========================================= */
.dashboard-scroll { padding: 30px; overflow-y: auto; height: calc(100vh - 70px); }

.kpi-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; margin-bottom: 30px; }
.kpi-card { background: var(--bg-panel); border: 1px solid var(--border); border-radius: 8px; padding: 20px; }
.kpi-card.highlight { grid-column: span 2; background: linear-gradient(145deg, var(--bg-panel) 0%, rgba(56, 189, 248, 0.05) 100%); border-color: rgba(56, 189, 248, 0.2); }
.kpi-card h3 { font-size: 13px; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 15px; font-weight: 500; }
.kpi-value { font-size: 36px; font-weight: 700; }

.vps-stats { display: flex; justify-content: space-between; }
.vps-stats .stat { display: flex; flex-direction: column; }
.vps-stats .label { font-size: 11px; color: var(--text-muted); text-transform: uppercase; margin-bottom: 5px; }
.vps-stats .val { font-size: 20px; font-weight: 600; color: var(--text-primary); }

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

.grid-2-col { display: grid; grid-template-columns: 2fr 1fr; gap: 20px; }
.panel { background: var(--bg-panel); border: 1px solid var(--border); border-radius: 8px; }
.panel-header { padding: 20px; border-bottom: 1px solid var(--border); }
.panel-header h2 { font-size: 15px; font-weight: 600; }
.panel-body { padding: 20px; }

/* Listas e Tabelas */
.event-item { padding: 15px 0; border-bottom: 1px solid rgba(255,255,255,0.05); display: flex; justify-content: space-between; align-items: center; }
.event-item:last-child { border: none; padding-bottom: 0; }
.event-info strong { color: var(--text-primary); margin-right: 10px; }
.event-info span { color: var(--text-secondary); font-size: 13px; }
.event-time { font-size: 12px; color: var(--text-muted); }

.tag { padding: 3px 8px; border-radius: 4px; font-size: 11px; font-weight: 600; text-transform: uppercase; }
.tag.critical { background: rgba(239, 68, 68, 0.1); color: var(--danger); }
.tag.warning { background: rgba(245, 158, 11, 0.1); color: var(--warning); }
.tag.info { background: rgba(56, 189, 248, 0.1); color: var(--accent); }

.engine-status { list-style: none; }
.engine-status li { margin-bottom: 12px; font-size: 13px; display: flex; align-items: center; gap: 10px; color: var(--text-secondary); }

.placeholder-view { display: flex; flex-direction: column; align-items: center; justify-content: center; height: 300px; color: var(--text-muted); }