body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial;
    margin: 0;
    background-color: rgb(243, 244, 246);
}

.contact-section {
    max-width: 600px;
    margin: 0 auto;
    padding: 0px 2em;
    text-align: center;
}

.contact-section h2 {
    font-size: 32px;
    margin-bottom: 10px;
    color: #111827;
}

.contact-section p {
    color: #6b7280;
    margin-bottom: 40px;
}

.contact-form {
    text-align: left;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    color: #374151;
    font-size: 14px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    font-size: 16px;
    box-sizing: border-box;
    transition: border 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #000;
}

#submitBtn {
    display: inline-block;
    background-color: #000000;
    color: #fff;
    padding: 10px 24px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    transition: background 0.3s;
}

/* #submitBtn:hover {
    background-color: #75a7dd;
} */

@media (max-width: 600px) {
    .contact-section h2 {
        font-size: 26px;
    }
}

#submitBtn.loading {
    position: relative;
    padding-left: 40px;
}

#submitBtn.loading::before {
    content: "";
    position: absolute;
    left: 10px;
    top: 50%;
    width: 16px;
    height: 16px;
    margin-top: -8px;
    border: 2px solid #fff;
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* 语言切换按钮样式 */
.lang-switch {
    max-width: 600px;
    margin: 20px auto 0;
    text-align: right;
    padding: 0 20px;
    font-size: 14px;
}

.lang-switch a {
    color: #374151;
    text-decoration: none;
    margin-left: 10px;
    cursor: pointer;
}

.lang-switch a.active {
    font-weight: 700;
    color: #111827;
    cursor: default;
}