* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", sans-serif;
}
body {
    background: #fff;
    color: #333;
    line-height: 1.6;
}
/* 导航栏 深色头部 */
header {
    background: #1a1a22;
    padding: 16px 8%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 999;
}
.logo {
    font-size: 26px;
    font-weight: bold;
    color: #fff;
}
.logo span {
    color: #d4af37; /* 金色 */
}
nav a {
    color: #eee;
    text-decoration: none;
    margin-left: 32px;
    font-size: 15px;
    transition: 0.3s;
}
nav a:hover {
    color: #d4af37;
}
nav a.active {
    color: #d4af37;
}
/* 首屏横幅模块（所有页面共用banner结构） */
.banner {
    background: #2c3038;
    text-align: center;
    padding: 80px 5%;
    color: #fff;
}
.banner h1 {
    font-size: 44px;
    margin-bottom: 24px;
}
.banner h1 span {
    color: #d4af37;
}
.banner p.desc {
    max-width: 820px;
    margin: 0 auto 40px;
    font-size: 17px;
    opacity: 0.9;
    line-height: 1.8;
}
.btn-gold {
    display: inline-block;
    background: #d4af37;
    color: #111;
    padding: 14px 42px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: bold;
    font-size: 16px;
}
/* 业务优势卡片区域通用 */
.section-title {
    text-align: center;
    font-size: 32px;
    margin: 60px 0 12px;
    position: relative;
}
.section-title::after {
    content: "";
    width: 70px;
    height: 3px;
    background: #d4af37;
    display: block;
    margin: 10px auto 30px;
}
.card-wrap {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    padding: 0 8%;
    margin-bottom: 80px;
}
.card-item {
    background: #f8f8f8;
    padding: 32px 24px;
    border-radius: 6px;
}
.card-item h3 {
    font-size: 20px;
    margin-bottom: 14px;
}
/* 底部通用 */
footer {
    background: #1a1a22;
    color: #ccc;
    text-align: center;
    padding: 30px;
    margin-top: 40px;
}