/* 头部导航栏 */
header {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

header.scrolled {
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.15);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
}

.logo img {
    height: 50px;
}

nav ul {
    display: flex;
}

nav ul li {
    margin-left: 20px;
}

nav ul li a {
    padding: 10px 15px;
    font-weight: 500;
    color: var(--primary-color);
    position: relative;
    overflow: hidden;
    border-radius: 6px;
    transition: all 0.3s ease;
}

nav ul li a::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(to right, var(--secondary-color), var(--accent-color));
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

nav ul li a:hover::before,
nav ul li a.active::before {
    width: 80%;
}

nav ul li a:hover, nav ul li a.active {
    color: var(--secondary-color);
    background-color: rgba(52, 152, 219, 0.1);
    transform: translateY(-2px);
}

nav ul li {
    margin-left: 5px;
}

.mobile-menu-btn {
    display: none;
    font-size: 24px;
    cursor: pointer;
    padding: 10px;
    border-radius: 6px;
    transition: all 0.3s ease;
    color: var(--primary-color);
}

.mobile-menu-btn:hover {
    background-color: rgba(52, 152, 219, 0.1);
    color: var(--secondary-color);
    transform: scale(1.1);
}

.mobile-menu-btn.active {
    transform: rotate(90deg);
}

/* 页脚 */
footer {
    background-color: var(--footer-color);
    color: white;
    padding-top: 60px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 50px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo img {
    height: 60px;
    margin-bottom: 20px;
}

.footer-logo p {
    color: rgba(255, 255, 255, 0.7);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.footer-link-group h4 {
    margin-bottom: 20px;
    color: white;
}

.footer-link-group ul li {
    margin-bottom: 10px;
}

.footer-link-group ul li a {
    color: rgba(255, 255, 255, 0.7);
}

.footer-link-group ul li a:hover {
    color: var(--secondary-color);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    color: rgba(255, 255, 255, 0.7);
}

.footer-bottom-links a {
    color: rgba(255, 255, 255, 0.7);
    margin-left: 20px;
}

.footer-bottom-links a:hover {
    color: var(--secondary-color);
}