:root {
    --bg-body: #0f172a;
    --bg-card: #1e293b;
    --bg-card-hover: #334155;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --border: #334155;
    --accent: #3b82f6;
    --success: #22c55e;
    --error: #ef4444;
    --warning: #f59e0b;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

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

body {
    font-family: system-ui, -apple-system, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.5;
    padding: 2rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

header {
    margin-bottom: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
    padding-bottom: 1rem;
}

h1 { font-size: 1.5rem; font-weight: 700; }
h2 { font-size: 1.25rem; margin-bottom: 1rem; color: var(--text-main); }

.meta { color: var(--text-muted); font-size: 0.875rem; }

/* Alerts */
.alerts-section { margin-bottom: 2rem; }
.alert-box {
    padding: 1rem;
    border-radius: 0.5rem;
    margin-bottom: 0.5rem;
    font-weight: 500;
}
.alert-box.error { background-color: rgba(239, 68, 68, 0.1); border: 1px solid var(--error); color: #fca5a5; }
.alert-box.warning { background-color: rgba(245, 158, 11, 0.1); border: 1px solid var(--warning); color: #fcd34d; }

/* Grid */
.node-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: transform 0.2s, border-color 0.2s;
}

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

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}

.node-name { font-weight: 600; font-size: 1.125rem; }
.node-location { font-size: 0.875rem; color: var(--text-muted); }
.node-ip { font-family: monospace; font-size: 0.75rem; color: var(--text-muted); background: rgba(0,0,0,0.2); padding: 2px 6px; border-radius: 4px; }

.status-list { display: flex; flex-direction: column; gap: 0.75rem; }
.status-item { display: flex; justify-content: space-between; align-items: center; font-size: 0.875rem; }

.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}
.badge.up { background-color: rgba(34, 197, 94, 0.15); color: var(--success); }
.badge.down { background-color: rgba(239, 68, 68, 0.15); color: var(--error); }

.cert-info { font-size: 0.75rem; color: var(--text-muted); margin-top: 0.25rem; text-align: right; }

/* History Table */
.table-container {
    background-color: var(--bg-card);
    border-radius: 0.75rem;
    border: 1px solid var(--border);
    overflow-x: auto;
}

table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }
th, td { padding: 1rem; text-align: left; border-bottom: 1px solid var(--border); }
th { background-color: rgba(0,0,0,0.2); font-weight: 600; color: var(--text-muted); }
tr:last-child td { border-bottom: none; }
tr:hover td { background-color: var(--bg-card-hover); }

.uptime-bar {
    height: 6px;
    background-color: var(--bg-body);
    border-radius: 3px;
    overflow: hidden;
    width: 100px;
    margin-top: 4px;
}
.uptime-fill { height: 100%; background-color: var(--success); }
.uptime-fill.warn { background-color: var(--warning); }
.uptime-fill.bad { background-color: var(--error); }

.footer { margin-top: 4rem; text-align: center; color: var(--text-muted); font-size: 0.875rem; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }