:root {
    --bg-primary: #0a0f1a;
    --bg-secondary: #111827;
    --bg-card: #1a2234;
    --accent-blue: #3b82f6;
    --accent-green: #10b981;
    --accent-red: #ef4444;
    --accent-yellow: #f59e0b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: #334155;
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.navbar {
    background: linear-gradient(180deg, #1a2234, #111827);
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand h1 {
    font-size: 1.5rem;
    background: linear-gradient(135deg, #06b6d4, #3b82f6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-subtitle { font-size: 0.7rem; color: var(--text-muted); text-transform: uppercase; }
.nav-links { display: flex; gap: 0.5rem; }
.nav-link { color: var(--text-secondary); text-decoration: none; padding: 0.5rem 1rem; border-radius: 0.5rem; }
.nav-link:hover { background: var(--bg-card); }

.status-indicator {
    padding: 0.375rem 0.875rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
}
.status-indicator.online { background: rgba(16,185,129,0.2); color: var(--accent-green); }

.main-content { flex: 1; padding: 1.5rem; max-width: 1400px; margin: 0 auto; width: 100%; }

.machine-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.machine-card {
    background: var(--bg-card);
    border-radius: 1rem;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.2s;
}
.machine-card:hover { border-color: var(--accent-blue); transform: translateY(-2px); }
.machine-card.offline { opacity: 0.6; }

.machine-status { display: flex; align-items: center; gap: 0.5rem; margin-bottom: 1rem; }
.status-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--text-muted); }
.status-dot.online { background: var(--accent-green); box-shadow: 0 0 10px var(--accent-green); }
.status-dot.offline { background: var(--accent-red); }

.machine-name { font-size: 1.25rem; margin-bottom: 0.25rem; }
.machine-id { font-size: 0.75rem; color: var(--text-muted); margin-bottom: 1rem; }

.machine-metrics { display: flex; gap: 1.5rem; margin-bottom: 1rem; }
.metric { text-align: center; }
.metric-value { font-size: 1.5rem; font-weight: 700; color: var(--accent-blue); }
.metric-label { font-size: 0.7rem; color: var(--text-muted); }

.last-seen { font-size: 0.75rem; color: var(--text-muted); }

.no-machines { text-align: center; padding: 3rem; color: var(--text-muted); }
.hint { font-size: 0.875rem; margin-top: 0.5rem; }

/* Machine detail */
.machine-header { display: flex; align-items: center; gap: 1rem; margin-bottom: 2rem; }
.back-link { color: var(--text-muted); text-decoration: none; }
.status-badge { padding: 0.375rem 1rem; border-radius: 9999px; font-size: 0.75rem; }
.status-badge.online { background: var(--accent-green); color: white; }
.status-badge.offline { background: var(--accent-red); color: white; }

.data-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1.5rem; }
.data-card { background: var(--bg-card); border-radius: 1rem; padding: 2rem; text-align: center; }
.data-value { font-size: 3rem; font-weight: 800; color: var(--accent-blue); }
.data-unit { font-size: 1.25rem; color: var(--text-secondary); }
.data-label { font-size: 0.875rem; color: var(--text-muted); margin-top: 1rem; }

.btn-realtime { padding: 0.5rem 1rem; background: var(--bg-secondary); border: 1px solid var(--border-color); color: var(--text-secondary); border-radius: 0.5rem; cursor: pointer; }
.btn-realtime.active { background: var(--accent-green); color: white; border-color: var(--accent-green); animation: pulse 2s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.7; } }

.usage-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 1rem; }
.usage-day { background: var(--bg-card); padding: 1rem; border-radius: 0.5rem; text-align: center; }
.usage-date { font-size: 0.75rem; color: var(--text-muted); }
.usage-bytes { font-size: 1.25rem; font-weight: 700; }
.usage-pushes { font-size: 0.7rem; color: var(--text-muted); }

.footer { background: var(--bg-secondary); border-top: 1px solid var(--border-color); padding: 0.75rem 1.5rem; font-size: 0.75rem; color: var(--text-muted); display: flex; justify-content: space-between; }

section { margin-bottom: 2rem; }
section h2 { font-size: 1rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 1rem; display: flex; align-items: center; gap: 1rem; }