body {
    background: #f1f5f9;
    font-family: Segoe UI, Arial;
}

.container {
    width: 900px;
    margin: 40px auto;
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 0 15px rgba(0,0,0,.08);
}

h2 {
    color: #0f172a;
}

h3 {
    margin-top: 30px;
    color: #1e293b;
}

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

th {
    background: #0ea5e9;
    color: white;
    padding: 10px;
}

td {
    padding: 8px;
    border-bottom: 1px solid #ddd;
}

input {
    width: 100%;
    padding: 7px;
    border-radius: 6px;
    border: 1px solid #ccc;
}

.card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 20px;
}

.add {
    background: #22c55e;
    color: white;
    border: none;
    padding: 10px;
    margin-top: 15px;
    border-radius: 8px;
    cursor: pointer;
}

.hitung {
    margin-top: 25px;
    width: 100%;
    background: #0f172a;
    color: white;
    border: none;
    padding: 15px;
    font-size: 18px;
    border-radius: 10px;
    cursor: pointer;
}

button {
    cursor: pointer;
    border: none;
    border-radius: 6px;
    padding: 6px 10px;
}