:root {
    --bg: #f5f5f5;
    --card-bg: #fff;
    --border: #ddd;
    --text: #333;
    --accent: #2563eb;
    --success: #16a34a;
    --warning: #d97706;
    --danger: #dc2626;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, monospace;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

nav {
    background: #1e293b;
    padding: 0.75rem 1.5rem;
    display: flex;
    gap: 1.5rem;
}

nav a {
    color: #e2e8f0;
    text-decoration: none;
    font-weight: 500;
}

nav a:hover { color: #fff; }

main { max-width: 1400px; margin: 1.5rem auto; padding: 0 1.5rem; }

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.25rem;
}

.card h3 { font-size: 0.85rem; color: #64748b; text-transform: uppercase; }
.card .value { font-size: 2rem; font-weight: 700; }
.card .value.success { color: var(--success); }
.card .value.warning { color: var(--warning); }
.card .value.danger { color: var(--danger); }

table { width: 100%; border-collapse: collapse; background: var(--card-bg); border-radius: 8px; overflow: hidden; }
th, td { padding: 0.5rem 0.75rem; text-align: left; border-bottom: 1px solid var(--border); }
th { background: #f8fafc; font-size: 0.8rem; text-transform: uppercase; color: #64748b; }
tr:hover { background: #f1f5f9; }

.status-success { color: var(--success); }
.status-partial { color: var(--warning); }
.status-failed { color: var(--danger); }

.search-form { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-bottom: 1.5rem; }
.search-form input, .search-form select { padding: 0.5rem; border: 1px solid var(--border); border-radius: 4px; }
.search-form button { padding: 0.5rem 1rem; background: var(--accent); color: #fff; border: none; border-radius: 4px; cursor: pointer; }

.detail-section { background: var(--card-bg); border: 1px solid var(--border); border-radius: 8px; padding: 1.25rem; margin-bottom: 1rem; }
.detail-section h2 { font-size: 1rem; margin-bottom: 0.75rem; color: #334155; }

.chart-container { background: var(--card-bg); border: 1px solid var(--border); border-radius: 8px; padding: 1.25rem; margin-bottom: 1rem; }

/* Rack elevation diagram */
.rack-elevation {
    display: flex;
    flex-direction: column-reverse;
    border: 2px solid #334155;
    border-radius: 4px;
    background: #1e293b;
    width: 320px;
    font-size: 0.75rem;
}

.rack-unit {
    display: flex;
    align-items: center;
    border-top: 1px solid #475569;
    min-height: 24px;
}

.rack-unit-label {
    width: 32px;
    text-align: center;
    color: #94a3b8;
    font-size: 0.65rem;
    flex-shrink: 0;
}

.rack-unit-slot {
    flex: 1;
    padding: 2px 6px;
    min-height: 22px;
}

.rack-unit-slot.empty {
    background: #0f172a;
}

.rack-unit-slot.occupied {
    background: #1e40af;
    color: #fff;
    cursor: pointer;
    text-decoration: none;
    display: block;
}

.rack-unit-slot.occupied:hover {
    background: #2563eb;
}

.rack-unit-slot.occupied.status-failed {
    background: #991b1b;
}

.rack-unit-slot.occupied.status-partial {
    background: #92400e;
}

.rack-unit-slot.server-top {
    border-radius: 3px 3px 0 0;
    padding-top: 4px;
}

.rack-unit-slot.server-bottom {
    border-radius: 0 0 3px 3px;
    padding-bottom: 4px;
}

.rack-unit-slot.server-single {
    border-radius: 3px;
    padding: 4px 6px;
}

.rack-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 1.5rem;
}

.rack-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.25rem;
}

.rack-card h3 { margin-bottom: 0.75rem; }
.rack-card .rack-stats { font-size: 0.85rem; color: #64748b; margin-bottom: 0.75rem; }