/* 前台样式 */

/* 基础重置与变量 */
:root {
    --primary-color: #0d6efd;
    --primary-hover: #0b5ed7;
    --secondary-color: #6c757d;
    --success-color: #198754;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #0dcaf0;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --border-color: #dee2e6;
    --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
    --radius: 0.5rem;
    --radius-sm: 0.375rem;
    --transition: all 0.2s ease;
}

/* 全局样式 */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #212529;
    background-color: #fff;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-hover);
    text-decoration: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* 导航栏 */
.navbar {
    padding: 1rem 0;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.navbar.scrolled {
    padding: 0.5rem 0;
    background-color: rgba(255, 255, 255, 0.98) !important;
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--dark-color) !important;
}

.navbar-brand:hover {
    color: var(--primary-color) !important;
}

.navbar-nav .nav-link {
    font-weight: 500;
    color: #495057 !important;
    padding: 0.5rem 1rem !important;
    margin: 0 0.25rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
    color: var(--primary-color) !important;
    background-color: rgba(13, 110, 253, 0.1);
}

.navbar-nav .nav-link i {
    margin-right: 0.375rem;
}

/* 下拉菜单 */
.dropdown-menu {
    border: none;
    box-shadow: var(--shadow);
    border-radius: var(--radius);
    padding: 0.5rem 0;
    margin-top: 0.5rem;
}

.dropdown-item {
    padding: 0.5rem 1.5rem;
    font-size: 0.875rem;
    transition: var(--transition);
}

.dropdown-item:hover {
    background-color: var(--light-color);
    color: var(--primary-color);
}

/* 搜索框 */
.search-form .form-control {
    border-radius: 50rem 0 0 50rem;
    border-right: none;
    padding-left: 1.25rem;
}

.search-form .btn {
    border-radius: 0 50rem 50rem 0;
    padding: 0.5rem 1.25rem;
}

/* 英雄区域 */
.hero {
    padding: 4rem 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.hero h1 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.hero .lead {
    font-size: 1.25rem;
    color: #6c757d;
    margin-bottom: 2rem;
}

.hero .btn {
    padding: 0.75rem 2rem;
    font-size: 1rem;
    font-weight: 600;
}

/* 面包屑 */
.breadcrumb {
    background: transparent;
    padding: 0;
    margin-bottom: 0;
    font-size: 0.875rem;
}

.breadcrumb-item + .breadcrumb-item::before {
    color: #6c757d;
}

.breadcrumb-item.active {
    color: #6c757d;
}

/* 卡片 */
.card {
    border: none;
    box-shadow: var(--shadow-sm);
    border-radius: var(--radius);
    transition: var(--transition);
    overflow: hidden;
}

.card:hover {
    box-shadow: var(--shadow);
    transform: translateY(-2px);
}

.card-img-top {
    transition: var(--transition);
}

.card:hover .card-img-top {
    transform: scale(1.05);
}

.card-body {
    padding: 1.5rem;
}

.card-title {
    font-weight: 600;
    margin-bottom: 0.75rem;
    font-size: 1.125rem;
}

.card-text {
    color: #6c757d;
    font-size: 0.9375rem;
    line-height: 1.6;
}

.card-footer {
    background: transparent;
    border-top: 1px solid var(--border-color);
    padding: 1rem 1.5rem;
}

/* 按钮 */
.btn {
    font-weight: 500;
    border-radius: var(--radius-sm);
    padding: 0.5rem 1.25rem;
    font-size: 0.875rem;
    transition: var(--transition);
    border: none;
}

.btn-lg {
    padding: 0.75rem 2rem;
    font-size: 1rem;
}

.btn-sm {
    padding: 0.375rem 0.875rem;
    font-size: 0.8125rem;
}

.btn-primary {
    background-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-outline-primary {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-outline-primary:hover {
    background-color: var(--primary-color);
    color: #fff;
}

.btn-link {
    padding: 0;
    font-weight: 500;
}

.btn-link:hover {
    text-decoration: underline;
}

/* 徽章 */
.badge {
    font-weight: 500;
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
    border-radius: 50rem;
}

/* 表单 */
.form-control,
.form-select {
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    padding: 0.625rem 1rem;
    font-size: 0.9375rem;
    transition: var(--transition);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}

.form-label {
    font-weight: 500;
    color: #495057;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.form-text {
    font-size: 0.8125rem;
    color: #6c757d;
    margin-top: 0.375rem;
}

/* 页脚 */
.footer {
    background-color: var(--dark-color);
    color: rgba(255, 255, 255, 0.7);
    padding: 3rem 0 1.5rem;
}

.footer h5 {
    color: #fff;
    font-weight: 600;
    margin-bottom: 1.5rem;
    font-size: 1rem;
}

.footer a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.footer a:hover {
    color: #fff;
}

.footer .nav-link {
    padding: 0.25rem 0;
    display: block;
}

.footer .social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
    color: #fff;
    margin-right: 0.5rem;
    transition: var(--transition);
}

.footer .social-links a:hover {
    background-color: var(--primary-color);
    transform: translateY(-2px);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 1.5rem;
    margin-top: 2rem;
    font-size: 0.875rem;
}

/* 产品卡片 */
.product-card {
    height: 100%;
}

.product-card .card-img-top {
    height: 2200px;
    object-fit: cover;
}

.product-card .badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    z-index: 1;
}

.product-card .card-title a {
    color: var(--dark-color);
}

.product-card .card-title a:hover {
    color: var(--primary-color);
}

.product-price {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

.product-meta {
    font-size: 0.8125rem;
    color: #6c757d;
}

/* 新闻卡片 */
.news-card {
    height: 100%;
}

.news-card .card-img-top {
    height: 180px;
    object-fit: cover;
}

.news-card .card-title {
    font-size: 1rem;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-meta {
    font-size: 0.8125rem;
    color: #6c757d;
    margin-bottom: 0.75rem;
}

.news-meta span {
    margin-right: 1rem;
}

.news-meta i {
    margin-right: 0.375rem;
}

/* 详情页 */
.detail-header {
    padding: 3rem 0;
    background-color: var(--light-color);
}

.detail-title {
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 1rem;
}

.detail-meta {
    font-size: 0.9375rem;
    color: #6c757d;
}

.detail-meta span {
    margin-right: 1.5rem;
}

.detail-meta i {
    margin-right: 0.375rem;
}

.detail-content {
    font-size: 1rem;
    line-height: 1.8;
    color: #495057;
}

.detail-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius);
    margin: 1.5rem 0;
}

.detail-content h2,
.detail-content h3,
.detail-content h4 {
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.detail-content p {
    margin-bottom: 1.5rem;
}

.detail-tags {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.detail-tags .badge {
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
}

/* 分页 */
.pagination {
    margin-bottom: 0;
}

.pagination .page-link {
    color: var(--primary-color);
    border-color: var(--border-color);
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    margin: 0 0.25rem;
    border-radius: var(--radius-sm);
}

.pagination .page-item.active .page-link {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.pagination .page-item.disabled .page-link {
    color: #6c757d;
}

/* 侧边栏 */
.sidebar .card {
    margin-bottom: 1.5rem;
}

.sidebar .list-group-item {
    border: none;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.sidebar .list-group-item:last-child {
    border-bottom: none;
}

.sidebar .list-group-item a {
    color: #495057;
    display: block;
    transition: var(--transition);
}

.sidebar .list-group-item a:hover {
    color: var(--primary-color);
    padding-left: 0.5rem;
}

.sidebar .list-group-item.active a {
    color: var(--primary-color);
    font-weight: 600;
}

/* 搜索结果 */
.search-results .card {
    margin-bottom: 1.5rem;
}

.search-results .card-title {
    font-size: 1.125rem;
}

.search-results .card-text {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.search-highlight {
    background-color: #fff3cd;
    padding: 0 0.25rem;
    border-radius: 0.125rem;
}

/* 联系表单 */
.contact-form .form-control {
    border-radius: var(--radius-sm);
}

.contact-form .btn {
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
}

/* 面包屑区域 */
.page-header {
    padding: 2rem 0;
    background-color: var(--light-color);
}

.page-header h1 {
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.page-header .breadcrumb {
    margin-bottom: 0;
}

/* 产品详情 */
.product-gallery .main-image {
    border-radius: var(--radius);
    overflow: hidden;
}

.product-gallery .thumbnails {
    display: flex;
    gap: 0.75rem;
    margin-top: 1rem;
}

.product-gallery .thumbnail {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    cursor: pointer;
    border: 2px solid transparent;
    transition: var(--transition);
}

.product-gallery .thumbnail.active,
.product-gallery .thumbnail:hover {
    border-color: var(--primary-color);
}

.product-gallery .thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.product-info h1 {
    font-weight: 700;
    margin-bottom: 1rem;
}

.product-price-large {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.product-description {
    line-height: 1.8;
    color: #495057;
    margin-bottom: 2rem;
}

.product-specs {
    background-color: var(--light-color);
    border-radius: var(--radius);
    padding: 1.5rem;
}

.product-specs table {
    margin-bottom: 0;
}

.product-specs th {
    width: 30%;
    font-weight: 500;
    color: #495057;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.product-specs td {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.product-specs tr:last-child th,
.product-specs tr:last-child td {
    border-bottom: none;
}

/* 空状态 */
.empty-state {
    padding: 4rem 2rem;
    text-align: center;
}

.empty-state i {
    font-size: 4rem;
    color: var(--border-color);
    margin-bottom: 1.5rem;
}

.empty-state h4 {
    font-weight: 600;
    margin-bottom: 1rem;
}

.empty-state p {
    color: #6c757d;
    margin-bottom: 2rem;
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 返回顶部 */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
}

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

.back-to-top:hover {
    background-color: var(--primary-hover);
    color: #fff;
    transform: translateY(-3px);
}

/* 响应式 */
@media (max-width: 991.98px) {
    .navbar-collapse {
        background: #fff;
        padding: 1rem;
        border-radius: var(--radius);
        margin-top: 0.5rem;
        box-shadow: var(--shadow);
    }
    
    .navbar-nav .nav-link {
        margin: 0.25rem 0;
    }
    
    .hero {
        padding: 3rem 0;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .detail-header {
        padding: 2rem 0;
    }
    
    .product-gallery .thumbnails {
        justify-content: center;
    }
}

@media (max-width: 767.98px) {
    .hero {
        padding: 2.5rem 0;
    }
    
    .hero h1 {
        font-size: 1.75rem;
    }
    
    .hero .lead {
        font-size: 1rem;
    }
    
    .footer {
        padding: 2rem 0 1rem;
    }
    
    .detail-title {
        font-size: 1.5rem;
    }
    
    .product-price-large {
        font-size: 1.5rem;
    }
    
    .back-to-top {
        bottom: 1rem;
        right: 1rem;
        width: 44px;
        height: 44px;
    }
    
    .pagination .page-link {
        padding: 0.375rem 0.75rem;
        font-size: 0.8125rem;
    }
}

/* 打印样式 */
@media print {
    .navbar,
    .footer,
    .btn,
    .pagination,
    .back-to-top,
    .sidebar {
        display: none !important;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid var(--border-color);
    }
    
    .detail-content {
        font-size: 12pt;
        line-height: 1.6;
    }
}

/* 动画类 */
.fade-in {
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.slide-up {
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.zoom-in {
    animation: zoomIn 0.3s ease-out;
}

@keyframes zoomIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--light-color);
}

::-webkit-scrollbar-thumb {
    background: #ced4da;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #adb5bd;
}

/* 选择文本 */
::selection {
    background-color: var(--primary-color);
    color: #fff;
}

/* 焦点可见 */
:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* 图片懒加载占位 */
img[loading="lazy"] {
    background-color: var(--light-color);
}

/* 表格响应式 */
.table-responsive {
    border-radius: var(--radius);
}

/* 警告框 */
.alert {
    border: none;
    border-radius: var(--radius);
    padding: 1rem 1.5rem;
}

.alert-dismissible .btn-close {
    padding: 1rem 1.5rem;
}

/* 模态框 */
.modal-content {
    border: none;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
}

.modal-header {
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 1.5rem;
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    border-top: 1px solid var(--border-color);
    padding: 1rem 1.5rem;
}

/* 下拉菜单动画 */
.dropdown-menu {
    animation: fadeIn 0.2s ease-out;
    transform-origin: top;
}

/* 工具提示 */
.tooltip-inner {
    background-color: var(--dark-color);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.8125rem;
}

/* 弹出框 */
.popover {
    border: none;
    box-shadow: var(--shadow);
    border-radius: var(--radius);
}

.popover-header {
    background-color: var(--light-color);
    border-bottom: 1px solid var(--border-color);
    border-radius: var(--radius) var(--radius) 0 0;
}

/* 标签页 */
.nav-tabs {
    border-bottom: 1px solid var(--border-color);
}

.nav-tabs .nav-link {
    border: none;
    border-bottom: 2px solid transparent;
    color: #6c757d;
    font-weight: 500;
    padding: 0.75rem 1.25rem;
    border-radius: 0;
}

.nav-tabs .nav-link:hover {
    border-color: transparent;
    color: var(--primary-color);
    background: transparent;
}

.nav-tabs .nav-link.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    background: transparent;
}

/* 手风琴 */
.accordion-button {
    font-weight: 500;
    padding: 1rem 1.25rem;
}

.accordion-button:not(.collapsed) {
    background-color: rgba(13, 110, 253, 0.1);
    color: var(--primary-color);
    box-shadow: none;
}

.accordion-button:focus {
    box-shadow: none;
    border-color: var(--border-color);
}

.accordion-body {
    padding: 1rem 1.25rem;
    color: #495057;
    line-height: 1.6;
}

/* 列表组 */
.list-group-item {
    border: none;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.list-group-item:first-child {
    border-top: none;
}

.list-group-item:last-child {
    border-bottom: none;
}

/* 进度条 */
.progress {
    height: 0.5rem;
    border-radius: 50rem;
    background-color: var(--light-color);
}

.progress-bar {
    border-radius: 50rem;
}

/* 徽章变体 */
.badge-soft-primary {
    background-color: rgba(13, 110, 253, 0.1);
    color: var(--primary-color);
}

.badge-soft-success {
    background-color: rgba(25, 135, 84, 0.1);
    color: var(--success-color);
}

.badge-soft-warning {
    background-color: rgba(255, 193, 7, 0.1);
    color: #997404;
}

.badge-soft-danger {
    background-color: rgba(220, 53, 69, 0.1);
    color: var(--danger-color);
}

.badge-soft-info {
    background-color: rgba(13, 202, 240, 0.1);
    color: #055160;
}

.badge-soft-secondary {
    background-color: rgba(108, 117, 125, 0.1);
    color: var(--secondary-color);
}

/* 图标盒子 */
.icon-box {
    width: 60px;
    height: 60px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.icon-box-primary {
    background-color: rgba(13, 110, 253, 0.1);
    color: var(--primary-color);
}

.icon-box-success {
    background-color: rgba(25, 135, 84, 0.1);
    color: var(--success-color);
}

.icon-box-warning {
    background-color: rgba(255, 193, 7, 0.1);
    color: #997404;
}

.icon-box-danger {
    background-color: rgba(220, 53, 69, 0.1);
    color: var(--danger-color);
}

.icon-box-info {
    background-color: rgba(13, 202, 240, 0.1);
    color: #055160;
}

/* 统计卡片 */
.stat-card {
    padding: 1.5rem;
}

.stat-card .stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.stat-card .stat-value {
    font-size: 2rem;
    font-weight: 700;
    margin: 0.5rem 0;
}

.stat-card .stat-label {
    font-size: 0.875rem;
    color: #6c757d;
}

.stat-card .stat-change {
    font-size: 0.8125rem;
    font-weight: 500;
}

/* 表单验证 */
.was-validated .form-control:valid,
.form-control.is-valid {
    border-color: var(--success-color);
    padding-right: calc(1.5em + 0.75rem);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 8'%3e%3cpath fill='%23198754' d='M2.3 6.73L.6 4.53c-.4-1.04.46-1.4 1.1-.8l1.1 1.4 3.4-3.8c.6-.63 1.6-.27 1.2.7l-4 4.6c-.43.5-.8.4-1.1.1z'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right calc(0.375em + 0.1875rem) center;
    background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
}

.was-validated .form-control:invalid,
.form-control.is-invalid {
    border-color: var(--danger-color);
    padding-right: calc(1.5em + 0.75rem);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12' width='12' height='12' fill='none' stroke='%23dc3545'%3e%3ccircle cx='6' cy='6' r='4.5'/%3e%3cpath stroke-linejoin='round' d='M5.8 3.6h.4L6 6.5z'/%3e%3ccircle cx='6' cy='8.2' r='.6' fill='%23dc3545' stroke='none'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right calc(0.375em + 0.1875rem) center;
    background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
}

.invalid-feedback {
    display: none;
    width: 100%;
    margin-top: 0.375rem;
    font-size: 0.8125rem;
    color: var(--danger-color);
}

.was-validated .form-control:invalid ~ .invalid-feedback,
.form-control.is-invalid ~ .invalid-feedback {
    display: block;
}

.valid-feedback {
    display: none;
    width: 100%;
    margin-top: 0.375rem;
    font-size: 0.8125rem;
    color: var(--success-color);
}

.was-validated .form-control:valid ~ .valid-feedback,
.form-control.is-valid ~ .valid-feedback {
    display: block;
}