body {
    background: #e6eef7;
    font-family: Arial, sans-serif;
}

#wrapper {
    width: 480px;
    margin: 40px auto;
    background: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 0 12px #b5c7dd;
}

h1 {
    text-align: center;
    background: #2a6ebb;
    color: white;
    padding: 12px;
    border-radius: 6px;
    margin-bottom: 25px;
}

.formRow {
    margin-bottom: 20px;
    position: relative;
}

label {
    font-weight: bold;
    display: block;
    margin-bottom: 6px;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="date"] {
    width: 100%;
    padding: 10px;
    border: 1px solid #9bb3d1;
    border-radius: 6px;
    font-size: 1em;
    transition: 0.25s ease;
}

input:focus {
    border-color: #2a6ebb;
    box-shadow: 0 0 6px rgba(42,110,187,0.4);
}

.student-number input {
    width: 40px;
    text-align: center;
    margin-right: 5px;
    padding: 10px;
    transition: 0.25s ease;
}

.student-number input:focus {
    background: #eef5ff;
    border-color: #2a6ebb;
}

.error {
    color: red;
    font-size: 0.9em;
    display: none;
    margin-top: 4px;
}

.validTick {
    position: absolute;
    right: 10px;
    top: 38px;
    font-size: 1.3em;
    color: green;
    display: none;
}

button {
    width: 100%;
    padding: 12px;
    background: #2a6ebb;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1.1em;
    cursor: pointer;
    transition: 0.25s ease;
}

button:hover:not(:disabled) {
    background: #1f5a9b;
}

button:disabled {
    background: #9bb3d1;
    cursor: not-allowed;
}

.checkboxRow label {
    font-weight: normal;
}