body {
    font-family: Arial, sans-serif;
    background: #f4f6f8;
    margin: 0;
    color: #1f2937;
}

header {
    background: #111827;
    color: #f9fafb;
    padding: 14px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header a {
    color: #93c5fd;
    margin-left: 10px;
}

main {
    padding: 16px;
    max-width: 1100px;
    margin: 0 auto;
}

.card {
    background: white;
    padding: 14px;
    border-radius: 8px;
    margin-bottom: 16px;
}

form {
    display: grid;
    gap: 8px;
    margin-bottom: 10px;
}

input, select, button {
    padding: 8px;
}

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

th, td {
    border: 1px solid #e5e7eb;
    padding: 8px;
    text-align: left;
}

.messages {
    background: #e0f2fe;
    border: 1px solid #7dd3fc;
    padding: 10px 15px;
    border-radius: 6px;
}