/* 导航栏样式 */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    height: var(--header-height);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 20px;
}

.logo img {
    height: 30px;
    width: auto;
}

.logo h1 {
    font-size: 1.2rem;
    font-weight: 500;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav-select {
    padding: 4px 24px 4px 8px;
    font-size: 15px;
    border: none;
    background-color: transparent;
    cursor: pointer;
    color: #333;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 0 center;
    background-size: 16px;
}

.nav-select:hover {
    color: #666;
}

.nav-select:focus {
    outline: none;
}

.nav-link {
    color: #333;
    text-decoration: none;
    font-size: 16px;
    padding: 6px 12px;
}

.nav-link:hover {
    color: #007bff;
}

/* 主要内容区域 */
main {
    margin-top: var(--header-height);
}

/* 页脚样式 */
footer {
    background: var(--primary-bg);
    color: var(--text-color);
    padding: 40px 20px;
    margin-top: 40px;
    border-top: 1px solid rgba(0,0,0,0.1);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    gap: 40px;
    padding: 20px 0;
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

.contact, .links {
    flex: 1;
    padding: 20px 0;
}

.contact h3, .links h3 {
    color: #333;
    margin-bottom: 15px;
    font-weight: 500;
}

.contact p {
    color: #666;
    margin: 8px 0;
}

.links a {
    color: #0066cc;
    text-decoration: none;
    margin-right: 20px;
    transition: color 0.3s ease;
}

.links a:hover {
    color: #004499;
}

.copyright {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 0;
    text-align: center;
    color: #999;
    font-size: 0.9rem;
}

.copyright p {
    margin: 5px 0;
}