/* 顶部导航整体 */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 60px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    z-index: 1000;
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

/* LOGO */
.logo {
    font-size: 24px;
    font-weight: bold;
    color: #16a34a; /* 绿色 */
}

/* 导航基础样式 */
.main-nav a {
    position: relative;
    margin-left: 36px;
    padding: 10px 4px;
    text-decoration: none;
    font-size: 16px;
    color: #555;
    transition: color 0.25s ease;
}

/* 鼠标经过：字体变绿，不变背景 */
.main-nav a:hover {
    color: #16a34a;
}

/* 下划线动画 */
.main-nav a::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -6px;
    height: 3px;
    background: #16a34a;
    border-radius: 2px;
    transform: scaleX(0);
    transform-origin: center;
    transition: transform 0.25s ease;
}

/* hover 出现下划线 */
.main-nav a:hover::after {
    transform: scaleX(1);
}

/* ===== 点击后 active ===== */
.main-nav a.active {
    color: #16a34a; /* 文字变绿 */
}

/* active 下划线显示 */
.main-nav a.active::after {
    transform: scaleX(1);
}

.site-footer {
    background: #f9fafb;
    padding: 50px 12% 20px;
    margin-top: 40px;
}

.footer-inner {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 40px;
    padding-bottom: 24px;
    border-bottom: 1px solid #e5e7eb;
}

.footer-title {
    font-size: 16px;
    margin-bottom: 14px;
    color: #111827;
}

.footer-link {
    display: block;
    font-size: 14px;
    color: #6b7280;
    text-decoration: none;
    margin-bottom: 6px;
}

.footer-link:hover {
    color: #15803d;
}

.footer-contact p {
    font-size: 14px;
    color: #4b5563;
    margin-bottom: 4px;
}

.footer-logo {
    font-size: 22px;
    font-weight: 700;
    color: #16a34a;
    margin-bottom: 8px;
}

.footer-bottom {
    text-align: center;
    margin-top: 16px;
    font-size: 12px;
    color: #9ca3af;
}