.container {
    max-width: 550px;
    margin: 0 auto;
    background: #1a1a1a;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.form-group {
    margin-bottom: 30px;
}

label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    color: #FFD700;
    margin-bottom: 0px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.required {
    color: #FFD700;
    margin-left: 4px;
}

input[type="text"],
input[type="email"],
input[type="tel"],
select,
textarea {
    width: 100%;
    padding: 12px 0;
    border: none;
    border-bottom: 2px solid #ddd;
    font-size: 14px;
    font-family: inherit;
    transition: border-color 0.3s;
    background: transparent;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
select:focus,
textarea:focus {
    outline: none;
    border-bottom-color: black;
}

select {
    cursor: pointer;
    color: #999;
    padding-right: 20px;
}

select:valid {
    color: #999;
}

textarea {
    min-height: 120px;
    resize: vertical;
    padding-top: 12px;
}

.error-message {
    color: #FFD700;
    font-size: 14px;
    margin-top: 8px;
    display: none;
}

#submitMessage {
    padding: 15px;
    border-radius: 4px;
    margin-bottom: 20px;
    font-size: 14px;
    font-weight: 600;
    display: none;
}

#submitMessage.success-message {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

#submitMessage.error-message {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

#submitMessage p {
    margin: 0;
}

.form-group.error input,
.form-group.error select,
.form-group.error textarea {
    border-bottom-color: #FFD700;
}

.form-group.error .error-message {
    display: block;
}

.submit-btn{
    width: 100%;
    padding: 12px;
    background-color: #FFD700;
    color: #000000;
    border: none;
    border-radius: 4px;
    font-size: 14px;
    font-family: inherit;
    text-transform: uppercase;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s;
}

.submit-btn:hover {
    background-color: #333;
}