* { box-sizing: border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: #f5f6f8;
    color: #1a1a1a;
    margin: 0;
    padding: 0;
    line-height: 1.5;
}
.container { max-width: 760px; margin: 0 auto; padding: 2rem 1rem; }
header { border-bottom: 1px solid #e1e4e8; padding-bottom: 1rem; margin-bottom: 2rem; }
header h1 { margin: 0; font-size: 1.4rem; }
header a { color: #1a1a1a; text-decoration: none; }
footer { margin-top: 3rem; color: #888; text-align: center; }
h2 { font-size: 1.2rem; margin-top: 0; }
.muted { color: #666; }
.error { background: #fde8e8; color: #9b1c1c; padding: 0.75rem; border-radius: 6px; margin: 1rem 0; }
table { width: 100%; border-collapse: collapse; margin: 1rem 0; background: #fff; border-radius: 8px; overflow: hidden; box-shadow: 0 1px 3px rgba(0,0,0,0.05); }
th, td { padding: 0.75rem; text-align: left; border-bottom: 1px solid #f0f0f0; font-size: 0.9rem; }
th { background: #fafbfc; font-weight: 600; }
tr:last-child td { border-bottom: none; }
code { background: #f0f0f0; padding: 2px 6px; border-radius: 3px; font-size: 0.85em; }
form { background: #fff; padding: 1.5rem; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.05); }
label { display: block; margin-bottom: 1rem; font-weight: 500; }
input[type="text"], input[type="tel"], input[type="password"] {
    width: 100%; padding: 0.6rem; border: 1px solid #d1d5da; border-radius: 6px;
    font-size: 1rem; margin-top: 0.4rem;
}
.btn-primary {
    background: #2563eb; color: #fff; border: none; padding: 0.6rem 1.2rem;
    border-radius: 6px; font-size: 0.95rem; cursor: pointer; text-decoration: none; display: inline-block;
}
.btn-primary:hover { background: #1d4ed8; }
.btn-link { background: none; color: #555; text-decoration: underline; padding: 0.6rem 0; border: none; cursor: pointer; margin-left: 0.5rem; }
.btn-danger {
    background: #dc2626; color: #fff; border: none; padding: 0.35rem 0.7rem;
    border-radius: 4px; font-size: 0.85rem; cursor: pointer;
}
.badge { padding: 2px 8px; border-radius: 12px; font-size: 0.75rem; font-weight: 600; }
.badge-active { background: #d1fae5; color: #065f46; }
.badge-disconnected { background: #fee2e2; color: #991b1b; }

.login-box { max-width: 380px; margin: 2rem auto; }
.login-box h2 { text-align: center; }
.logout-link { float: right; font-size: 0.85rem; color: #555; }