/* 返回顶部按钮样式 - 优化版 */

.back-to-top-btn,
#backToHomeBtn,
.back-to-home-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #00adb5;
    color: #ffffff;
    text-decoration: none;
    border-radius: 50%;
    box-shadow: 0 6px 18px rgba(0, 173, 181, 0.35);
    z-index: 9999;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    border: 2px solid transparent;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
}

.back-to-top-btn.show,
#backToHomeBtn.show,
.back-to-home-btn.show {
    display: flex;
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top-btn:hover,
#backToHomeBtn:hover,
.back-to-home-btn:hover {
    transform: translateY(-6px);
    box-shadow: 0 10px 24px rgba(0, 173, 181, 0.45);
    background: #14c5cd;
    border-color: #14c5cd;
}

.back-to-top-btn:active,
#backToHomeBtn:active,
.back-to-home-btn:active {
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(0, 173, 181, 0.4);
}

.back-to-top-btn .btn-icon,
#backToHomeBtn .btn-icon,
.back-to-home-btn .btn-icon {
    width: 24px;
    height: 24px;
    display: block;
    stroke: currentColor;
    fill: none;
    stroke-width: 2.4;
    transition: transform 0.3s ease;
}

.back-to-top-btn:hover .btn-icon,
#backToHomeBtn:hover .btn-icon,
.back-to-home-btn:hover .btn-icon {
    transform: scale(1.1);
}

/* 移动端响应式 */
@media (max-width: 768px) {
    .back-to-top-btn,
    #backToHomeBtn,
    .back-to-home-btn {
        bottom: 20px;
        right: 20px;
        width: 48px;
        height: 48px;
    }
    
    .back-to-top-btn .btn-icon,
    #backToHomeBtn .btn-icon,
    .back-to-home-btn .btn-icon {
        width: 22px;
        height: 22px;
    }
}

@media (max-width: 480px) {
    .back-to-top-btn,
    #backToHomeBtn,
    .back-to-home-btn {
        bottom: 15px;
        right: 15px;
        width: 44px;
        height: 44px;
    }
    
    .back-to-top-btn .btn-icon,
    #backToHomeBtn .btn-icon,
    .back-to-home-btn .btn-icon {
        width: 20px;
        height: 20px;
    }
}

/* 导航栏滚动效果 */
.header_section.scrolled,
.header.scrolled {
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    background: rgba(255, 255, 255, 0.98) !important;
}

/* 导航下拉菜单动画 */
.nav-dropdown {
    position: relative;
}

.nav-dropdown .dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 4px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    min-width: 200px;
    padding: 10px 0;
    margin-top: 5px;
    z-index: 1000;
    opacity: 0;
    transform: translateY(-10px);
    transition: all 0.3s ease;
}

.nav-dropdown.open .dropdown-menu {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.nav-dropdown .dropdown-menu a {
    display: block;
    padding: 10px 20px;
    color: #333;
    text-decoration: none;
    transition: all 0.2s ease;
}

.nav-dropdown .dropdown-menu a:hover {
    background: #f5f5f5;
    color: #DFB163;
    padding-left: 25px;
}

/* Bootstrap导航栏样式优化 */
.navbar-toggler {
    border: none;
    padding: 5px 10px;
    background: transparent;
}

.navbar-toggler:focus {
    outline: none;
    box-shadow: none;
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%2833, 37, 41, 0.75%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    width: 30px;
    height: 30px;
}

/* 导航下拉菜单在桌面端显示 */
@media (min-width: 992px) {
    .nav-dropdown:hover .dropdown-menu {
        display: block;
        opacity: 1;
        transform: translateY(0);
    }
    
    .nav-dropdown .dropdown-menu {
        display: none;
    }
}

/* 导航链接悬停效果 */
.nav a:hover,
.navbar-nav .nav-link:hover {
    color: #DFB163 !important;
}

.nav a.active,
.navbar-nav .nav-link.active {
    color: #DFB163 !important;
    font-weight: 600;
}