.banner-bg {
    background: url('../images/banner.png') no-repeat center center/cover;
    min-height: 600px;
    width: 100%;
    position: relative;
}

.top-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: all 0.3s ease;
    padding: 20px 0;
}

.top-bar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 10px 0;
}

.top-bar.scrolled .title-cn {
    color: #333;
}

.top-bar.scrolled .title-en {
    color: #666;
}

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

.top-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 15px;
}

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

.logo {
    width: 42px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

.site-title {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.title-cn {
    font-size: 20px;
    font-weight: bold;
    color: #333;
}

.title-en {
    font-size: 12px;
    color: #666;
}

.nav-area {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 30px;
}

.nav-menu a {
    color: #333;
    text-decoration: none;
    font-size: 16px;
    padding: 5px 0;
    position: relative;
    transition: color 0.3s ease;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: #1890ff;
}

.nav-menu a:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: #1890ff;
    transition: width 0.3s ease;
}

.nav-menu a:hover:after,
.nav-menu a.active:after {
    width: 100%;
}

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

.icon-item {
    position: relative;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-item img {
    width: 20px;
    height: 20px;
    transition: transform 0.3s ease;
}

.icon-item:hover img {
    transform: scale(1.1);
}

.qrcode-popup {
    display: none;
    position: absolute;
    top: 100%;
    right: -50%;
    background: white;
    padding: 10px;
    border-radius: 4px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
    margin-top: 10px;
}

.qrcode-popup:before {
    content: '';
    position: absolute;
    top: -6px;
    right: 50%;
    transform: translateX(50%);
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-bottom: 6px solid white;
}

.qrcode-popup img {
    width: 120px;
    height: 120px;
}

.banner-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 180px 15px 0;
    color: white;
    text-align: center;
}

.banner-content h1 {
    font-size: 48px;
    margin-bottom: 20px;
    font-weight: bold;
}

.banner-subtitle {
    font-size: 24px;
    margin-bottom: 30px;
    opacity: 0.9;
}

.banner-btn {
    display: inline-block;
    padding: 12px 30px;
    background: #1890ff;
    color: white;
    border-radius: 4px;
    text-decoration: none;
    transition: background 0.3s ease;
}

.banner-btn:hover {
    background: #40a9ff;
    color: white;
    text-decoration: none;
}

@media (max-width: 1200px) {
    .top-container {
        padding: 0 20px;
    }
}

@media (max-width: 992px) {
    .title-en {
        display: none;
    }
    .nav-menu {
        gap: 20px;
    }
}

@media (max-width: 768px) {
    .top-bar {
        padding: 10px 0;
    }
    .logo {
        width: 80px;
        height: 40px;
    }
    .title-cn {
        font-size: 16px;
    }
    .nav-menu {
        display: none;
    }
    .banner-content {
        padding-top: 120px;
    }
    .banner-content h1 {
        font-size: 32px;
    }
    .banner-subtitle {
        font-size: 18px;
    }
}