* { box-sizing: border-box; margin: 0; padding: 0; }

ul { list-style: none; }

/* --- 颜色变量 --- */
:root {
    --padding-x: calc((100vw - 1000px) / 2);
    --primary-red: #b71c1c; /* 工业红，呼应互感器颜色 */
    --dark-gray: #2c3e50;
    --light-gray: #ecf0f1;
    --text-gray: #666;
}

/* --- 页面标题 Banner --- */
.page-banner {
    background: #083b94;
    color: #fff;
    text-align: center;
    padding: 60px 20px;
}
.page-banner h1 { font-size: 32px; margin-bottom: 10px; }
.page-banner p { font-size: 18px; opacity: 0.9; }

/* --- 主体内容 --- */
.container {
    margin: 50px auto;
    padding: 0 var(--padding-x);
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
}

/* 左侧：联系信息 */
.contact-info {
    flex: 1;
    min-width: 300px;
    background: #fff;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    border-top: 5px solid var(--primary-red);
}
.contact-info h3 { margin-bottom: 20px; color: var(--dark-gray); font-size: 18px; }
.info-item { margin-bottom: 20px; display: flex; align-items: flex-start; }
.info-icon {
    width: 40px;
    height: 40px;
    background: var(--light-gray);
    color: var(--primary-red);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 15px;
    font-weight: bold;
    flex-shrink: 0;
}
.info-text strong { display: block; margin-bottom: 5px; color: var(--dark-gray); }
.info-text p { color: var(--text-gray); margin: 0;font-size: 14px; }
/* 右侧：表单 */
.contact-form {
    flex: 1;
    min-width: 300px;
    background: #fff;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}
.contact-form h3 { margin-bottom: 25px; color: var(--dark-gray); }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 8px; font-weight: 500; }
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    transition: border 0.3s;
}
.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary-red);
    outline: none;
}
.submit-btn {
    background: #d71920;
    color: #fff;
    border: none;
    padding: 10px 40px;
    font-size: 14px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    width: 100%;
}
.submit-btn:hover { background: #901515; }