body {
    font-family: "Segoe UI", Tahoma, sans-serif;
    background: #f4f7fb;
    color: #1f2937;
}

.sidebar {
    min-height: 100vh;
    background: linear-gradient(180deg, #0f172a 0%, #1e293b 100%);
}

.sidebar .nav-link {
    color: #cbd5e1;
    border-radius: 0.85rem;
    margin-bottom: 0.35rem;
}

.sidebar .nav-link.active,
.sidebar .nav-link:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.12);
}

.stat-card,
.panel-card,
.result-card {
    border: 0;
    border-radius: 1.25rem;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

.serial-search-input {
    height: 72px;
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: 2px;
    text-align: center;
}

.badge-status {
    font-size: 0.85rem;
    padding: 0.55rem 0.8rem;
}

.table thead th {
    white-space: nowrap;
}

.info-list dt {
    color: #64748b;
    font-weight: 600;
}

.info-list dd {
    font-weight: 600;
}

.auth-shell {
    min-height: 100vh;
    background:
        radial-gradient(circle at top right, rgba(14, 165, 233, 0.2), transparent 30%),
        linear-gradient(135deg, #0f172a, #1e3a8a);
}

.auth-card {
    border: 0;
    border-radius: 1.5rem;
    box-shadow: 0 18px 50px rgba(15, 23, 42, 0.25);
}