/* ========== 导航栏统一样式 ========== */

/* 主导航容器 */
.main-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    transition: transform 0.3s ease-in-out;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 56px;
    width: 100vw;
    box-sizing: border-box;
}

/* 导航栏内容容器 */
.main-nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    max-width: 1200px;
    box-sizing: border-box;
}

/* 首页导航栏动画效果 */
.main-nav.index-nav {
    transform: translateY(0);
}

.main-nav.index-nav.show {
    transform: translateY(0);
}

/* Logo 样式 */
.logo {
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

.logo a {
    display: inline-block;
    line-height: 1;
    text-decoration: none;
}

.logo img {
    height: 22px;
    width: auto;
    display: block;
    vertical-align: middle;
}

/* 导航链接容器 */
.nav-links {
    display: flex;
    gap: 40px;
    margin: 0;
    padding: 0;
    list-style: none;
    align-items: center;
}

.nav-links li {
    display: flex;
    align-items: center;
}

/* 导航链接样式 */
.nav-links a {
    color: #333333;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s ease;
    position: relative;
    padding-bottom: 4px;
    font-weight: 400;
    line-height: 1;
    white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active {
    color: #f18721;
}

/* 导航链接下划线效果 */
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    width: 0;
    height: 2px;
    background-color: #f18721;
    transition: width 0.3s ease;
    transform: translateX(-50%);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 12px;
}

/* ========== 响应式设计 ========== */

/* 大屏幕适配 (1440px以下) */
@media (max-width: 1440px) {
    .main-nav-content {
        padding: 0 80px;
    }
}

/* 中等屏幕适配 (1200px以下) */
@media (max-width: 1200px) {
    .main-nav-content {
        padding: 0 60px;
    }
}

/* 平板设备适配 (992px以下) */
@media (max-width: 992px) {
    .main-nav-content {
        padding: 0 40px;
    }
    
    .nav-links {
        gap: 30px;
    }
}

/* 手机设备适配 (768px以下) */
@media (max-width: 768px) {
    .main-nav {
        height: 50px;
    }
    
    .main-nav-content {
        padding: 0 20px;
    }
    
    .nav-links {
        display: none; /* 移动端隐藏导航链接 */
    }
    
    .logo img {
        height: 20px;
    }
}

/* 小屏手机适配 (480px以下) */
@media (max-width: 480px) {
    .main-nav-content {
        padding: 0 15px;
    }
}