body {
    margin: 0;
    font-family: Segoe UI, Arial;
    display: flex;
    background: #f4f6f9;
}

nav {
    width: 240px;
    background: #111827;
    color: #fff;
    height: 100vh;
    padding: 20px;
}

nav h2 {
    margin-bottom: 20px;
}

nav a {
    display: block;
    padding: 10px;
    color: white;
    text-decoration: none;
    margin-bottom: 8px;
    border-radius: 6px;
    background: #1f2937;
}

nav a:hover {
    background: #374151;
}

main {
    flex: 1;
    padding: 20px;
}

.card {
    background: white;
    padding: 15px;
    border-radius: 10px;
    margin-bottom: 20px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

input, textarea {
    width: 100%;
    padding: 6px;
    margin: 5px 0;
}

button {
    padding: 10px;
    background: #2563eb;
    color: white;
    border: none;
    cursor: pointer;
}

table {
    width: 100%;
    border-collapse: collapse;
}

td, th {
    padding: 6px;
    border-bottom: 1px solid #ddd;
    text-align: center;
}

.good { background: #d1fae5; }
.warn { background: #fef3c7; }
.bad { background: #fee2e2; }