/* ==================== 颜色变量 ==================== */
:root {
    --primary-red: #e60012;
    --primary-red-dark: #c41230;
}

/* ==================== 基础样式 ==================== */
* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Arial', sans-serif;
    overflow-x: hidden;
}

/* ==================== 移动端导航栏 ==================== */
@media (max-width: 991px) {
    /* 移动端导航白色背景 */
    .main-nav {
        background-color: #fff;
        border-bottom: 1px solid #e0e0e0;
    }
    
    .main-nav .container {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 0 15px;
    }
    
    /* 移动端Logo */
    .mobile-logo {
        display: flex !important;
        align-items: center;
        gap: 8px;
        padding: 10px 0;
        order: 1;
    }
    
    .mobile-logo img {
        height: 36px;
    }
    
    .mobile-logo-text {
        font-size: 16px;
        font-weight: bold;
        color: #333;
    }
    
    /* 导航按钮 */
    .navbar-toggler {
        order: 2;
        width: 40px;
        height: 40px;
        border-radius: 50%;
        background-color: #e60012;
        border: none;
        padding: 0;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .navbar-toggler-icon {
        width: 20px;
        height: 20px;
        background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 1%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }
    
    .navbar-collapse {
        order: 3;
        width: 100%;
        background-color: #fff;
        border-top: 1px solid #f0f0f0;
    }
    
    .main-nav .nav-item {
        text-align: left;
        border-bottom: 1px solid #e8e8e8;
    }
    
    .main-nav .nav-link {
        color: #333 !important;
        padding: 14px 20px !important;
        font-size: 15px;
        border-bottom: none !important;
    }
    
    .main-nav .nav-link.active,
    .main-nav .nav-item.nav-item-hover .nav-link {
        background-color: #f0f0f0 !important;
        color: var(--primary-red) !important;
        border-bottom: none !important;
    }
    
    /* 移动端二级菜单 */
    .main-nav .dropdown-menu {
        background-color: #f0f0f0;
        border: none;
        box-shadow: none;
        border-radius: 0;
        padding: 0;
        margin: 0;
        display: none;
        opacity: 1;
        visibility: visible;
        transform: none;
        transition: none;
    }
    
    .main-nav .dropdown.show .dropdown-menu {
        display: block;
    }
    
    .main-nav .dropdown-item {
        padding: 12px 35px;
        border-bottom: 1px solid #e0e0e0;
        color: #555;
    }
    
    .main-nav .dropdown-item:hover {
        background-color: #e8e8e8;
        color: var(--primary-red);
    }
    
    .main-nav .dropdown-toggle::after {
        float: right;
        margin-top: 8px;
    }
    
    /* 平板端顶部调整 */
    .logo-img {
        height: 50px;
    }
    
    .logo-text {
        font-size: 24px;
    }
    
    .header-divider {
        height: 40px;
        margin: 0 20px;
    }
    
    .hotline-label {
        font-size: 12px;
    }
    
    .hotline-number {
        font-size: 18px;
    }
    
}

@media (max-width: 767px) {
    /* 手机端 */
    .main-nav .container {
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    
    .mobile-logo img {
        height: 32px;
    }
    
    .mobile-logo-text {
        font-size: 14px;
    }
    
    .navbar-toggler {
        width: 36px;
        height: 36px;
    }
    
    .navbar-toggler-icon {
        width: 18px;
        height: 18px;
    }
    
    .main-nav .nav-link {
        padding: 12px 18px !important;
        font-size: 14px;
        border-bottom: none !important;
    }
    
    .main-nav .dropdown-item {
        padding: 10px 30px;
        font-size: 13px;
    }
    
}

@media (max-width: 991px) {
    /* 平板端 */
    
    /* 隐藏联系方式 */
    .contact-box {
        display: none;
    }
}

@media (min-width: 1200px) {
    /* 大屏PC */
    .container {
        max-width: 1200px;
    }
    
    .header-content {
        gap: 25px;
    }
    
    .logo-img {
        height: 60px;
    }
    
    .logo-text {
        font-size: 28px;
    }
    
    .header-divider {
        height: 50px;
    }
    
    .hotline-number {
        font-size: 22px;
    }
    
    .qr-placeholder {
        width: 75px;
        height: 75px;
    }
    
    .main-nav .nav-link {
        padding: 18px 30px 15px !important;
        font-size: 16px;
    }
}

/* ==================== Banner区域通用样式 ==================== */
.page-banner {
    width: 100%;
    max-height: 700px;
    overflow: hidden;
}

.page-banner img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* 移动端适配 */
@media (max-width: 767px) {
    .page-banner {
        height: 150px;
    }
}

/* 小屏移动端适配 */
@media (max-width: 480px) {
    .page-banner {
        height: 150px;
    }
}

/* 平板端适配 */
@media (max-width: 991px) {
    .page-banner {
        height: 200px;
    }
}

/* ==================== 返回顶部按钮 ==================== */
.back-to-top {
    position: fixed;
    bottom: 400px;
    right: 60px;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background-color: #f06c36;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
}

.back-to-top img {
    width: 20px;
    height: 20px;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

/* 移动端返回顶部按钮 */
@media (max-width: 767px) {
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 40px;
        height: 40px;
    }
    
    .back-to-top img {
        width: 18px;
        height: 18px;
    }
}