* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: #f4f5f7;
    color: #1f2937;
}
header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #111827;
    color: #fff;
    padding: 0.75rem 1.5rem;
}
header .brand { font-weight: 700; }
header nav a {
    color: #cbd5e1;
    text-decoration: none;
    margin-left: 1rem;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
}
header nav a:hover { color: #fff; }
header nav a.active { background: #374151; color: #fff; }
main { max-width: 960px; margin: 2rem auto; padding: 0 1rem; }
h1 { font-size: 1.4rem; }
table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 8px; overflow: hidden; }
th, td { text-align: left; padding: 0.6rem 0.8rem; border-bottom: 1px solid #e5e7eb; }
th { background: #f9fafb; font-size: 0.85rem; text-transform: uppercase; color: #6b7280; }
tr:last-child td { border-bottom: none; }
.card { background: #fff; border-radius: 8px; padding: 1.25rem; margin-bottom: 1.5rem; box-shadow: 0 1px 2px rgba(0,0,0,0.05); }
.flash { padding: 0.75rem 1rem; border-radius: 6px; margin-bottom: 1rem; }
.flash.ok { background: #d1fae5; color: #065f46; }
.flash.error { background: #fee2e2; color: #991b1b; }
label { display: block; font-weight: 600; margin: 0.75rem 0 0.25rem; font-size: 0.9rem; }
input[type=text], input[type=password], input[type=number] {
    width: 100%;
    padding: 0.5rem 0.6rem;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 0.95rem;
}
button, .btn {
    display: inline-block;
    background: #2563eb;
    color: #fff;
    border: none;
    border-radius: 6px;
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    cursor: pointer;
    text-decoration: none;
    margin-top: 0.75rem;
}
button:hover, .btn:hover { background: #1d4ed8; }
button.secondary { background: #6b7280; }
button.secondary:hover { background: #4b5563; }
.badge { display: inline-block; padding: 0.15rem 0.5rem; border-radius: 999px; font-size: 0.75rem; font-weight: 600; }
.badge.ok { background: #d1fae5; color: #065f46; }
.badge.error { background: #fee2e2; color: #991b1b; }
.badge.on { background: #dbeafe; color: #1e40af; }
.badge.off { background: #e5e7eb; color: #6b7280; }
.muted { color: #6b7280; font-size: 0.85rem; }
.login-box { max-width: 360px; margin: 6rem auto; }
form.inline { display: inline; }
form.inline button { margin-top: 0; padding: 0.25rem 0.6rem; font-size: 0.8rem; }
pre.msg { white-space: pre-wrap; font-size: 0.85rem; margin: 0; }