.form-area {
    width: 100%;
    max-width: 600px;
    margin: 50px auto 0;
}
form label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: #333;
}
form label span,
.privacy-title span {
    background-color: #C8161D;
    color: white;
    margin-left: 5px;
    padding: 2px 4px;
    font-size: .8rem;
    border-radius: 5px;
}
form input[type="text"],
form input[type="email"],
form textarea {
    width: 100%;
    padding: 12px 15px;
    margin-bottom: 20px;
    border: 1px solid #dcdde1;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s, box-shadow 0.3s;
    box-sizing: border-box;
}
form input[type="text"]:focus,
form input[type="email"]:focus,
form textarea:focus {
    border-color: #C8161D;
    box-shadow: 0 0 8px rgba(157, 157, 160, 0.3);
    outline: none;
}
.privacy-section {
    margin-bottom: 20px;
}
.privacy-title {
    font-weight: 700;
    margin-bottom: 8px;
    font-size: 16px;
    color: #333333;
}
.privacy-text {
    margin-bottom: 10px;
    font-size: 14px;
    color: #555;
}
.privacy-text a {
    color: #C8161D;
}
.checkbox-label {
    display: flex;
    align-items: center;
    font-size: 14px;
    font-weight: 500;
}
.checkbox-label input {
    width: 18px;
    height: 18px;
    margin-right: 8px;
    accent-color: #C8161D;
}
.form-btn {
    background: #C8161D;
    color: #fff;
    border: none;
    padding: 14px 25px;
    font-size: 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.3s, transform 0.2s;
    width: 100%;
}
.form-btn:hover {
    background: #720c10;
    transform: translateY(-2px);
}
.error {
    color: #e74c3c;
    margin-bottom: 20px;
    font-weight: 500;
}
.success {
    color: #2ecc71;
    margin-bottom: 20px;
    font-weight: 500;
}
.check-center {
    display: flex;
    justify-content: center;
    margin: 20px auto 0;
}
/* ===== レスポンシブ対応 ===== */
@media screen and (max-width: 768px) {
    form input[type="text"],
    form input[type="email"],
    form textarea {
        font-size: 15px;
        padding: 10px 12px;
    }
    .form-btn {
        padding: 12px 20px;
        font-size: 15px;
    }
}
@media screen and (max-width: 480px) {
    form input[type="text"],
    form input[type="email"],
    form textarea {
        font-size: 14px;
        padding: 10px;
    }
    .form-btn {
        font-size: 14px;
        padding: 10px;
    }
    .privacy-title, .privacy-text, .checkbox-label {
        font-size: 14px;
    }
}