/* ===== Global Style ===== */
body {
    font-family: Arial, Helvetica, sans-serif;
    background: linear-gradient(to right, #e6f2ff, #ffffff);
    margin: 0;
    padding: 0;
    color: #003366;
}

/* ===== Container ===== */
.main-container {
    width: 600px;
    margin: 50px auto;
    background-color: #ffffff;
    border: 2px solid #3399ff;
    border-radius: 10px;
    padding: 25px 30px;
    box-shadow: 0px 4px 12px rgba(0, 51, 102, 0.2);
}

/* ===== Title ===== */
h2 {
    text-align: center;
    color: #003366;
    margin-bottom: 10px;
    font-weight: bold;
}

hr {
    border: 0;
    border-top: 2px solid #0066cc;
    width: 60px;
    margin: 10px auto 20px auto;
}

/* ===== Table Style ===== */
table {
    width: 100%;
    border-collapse: collapse;
}

td {
    padding: 10px;
    vertical-align: middle;
    color: #003366;
    font-weight: bold;
}

/* ===== Input & Select ===== */
input[type="number"],
input[type="datetime-local"],
select {
    width: 100%;
    padding: 8px;
    border: 1px solid #3399ff;
    border-radius: 5px;
    background-color: #f9fcff;
    color: #003366;
    font-size: 14px;
    transition: 0.3s;
}

input:focus,
select:focus {
    border-color: #0066cc;
    outline: none;
    box-shadow: 0px 0px 5px rgba(0, 102, 204, 0.5);
}

/* ===== Button Primary ===== */
.btn-primary {
    background-color: #0066cc;
    color: #ffffff;
    font-weight: bold;
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: 0.3s;
}

.btn-primary:hover {
    background-color: #004080;
}

/* ===== Back Button ===== */
.btn-back {
    display: inline-block;
    margin-left: 10px;
    background-color: #3399ff;
    color: #ffffff;
    padding: 10px 18px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: bold;
    transition: 0.3s;
}

.btn-back:hover {
    background-color: #004080;
}