/* Header样式 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 144px;
    background: linear-gradient(to bottom, #316AB4, #316ab464, #316ab400);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    height: 80px;
}

.header-content {
    width: 100%;
    max-width: 1400px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
}

.logo {
    width: 214px;
    height: auto;
    cursor: pointer;
}

.logo img {
    width: 100%;
    height: auto;
    transition: opacity 0.3s ease;
}

.logo .logo-default {
    display: block;
}

.logo .logo-white {
    display: none;
}

.header.scrolled .logo .logo-default {
    display: none;
}

.header.scrolled .logo .logo-white {
    display: block;
}

.nav-section {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.search-btn {
    display: flex;
    align-items: center;
    color: white;
    text-decoration: none;
    margin-bottom: 10px;
    font-size: 14px;
    transition: color 0.3s ease;
}

.header.scrolled .search-btn {
    color: #333;
}

.search-btn img {
    width: 20px;
    height: 20px;
    margin-right: 5px;
    transition: opacity 0.3s ease;
}

.search-btn .search-default {
    display: block;
}

.search-btn .search-white {
    display: none;
}

.header.scrolled .search-btn .search-default {
    display: none;
}

.header.scrolled .search-btn .search-white {
    display: block;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-menu li {
    position: relative;
}

.nav-menu a {
    color: white;
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.header.scrolled .nav-menu a {
    color: #333;
}

.nav-menu a:hover {
    opacity: 0.8;
    color: #fff;
    text-decoration: none;
}

.header.scrolled .nav-menu a:hover {
    color: var(--mainColor);
    opacity: 1;
}