/* =============================================
   前台样式 - 现代 SaaS 风格（与后台配套）
   ============================================= */

:root {
    /* 主色调 - 与后台统一 */
    --primary: #5a67d8;
    --primary-dark: #4c51bf;
    --primary-light: #7c85e0;
    --primary-bg: rgba(90, 103, 216, 0.08);
    
    /* 中性色 */
    --dark: #1e2a3b;
    --gray-900: #2d3748;
    --gray-700: #4a5568;
    --gray-500: #718096;
    --gray-300: #e2e8f0;
    --gray-100: #f7fafc;
    --white: #ffffff;
    
    /* 语义色 */
    --success: #48bb78;
    --danger: #f56565;
    --warning: #ed8936;
    --info: #4299e1;
    
    /* 背景 */
    --bg-body: #f4f6fb;
    --bg-card: #ffffff;
    --bg-glass: rgba(255, 255, 255, 0.85);
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(30, 42, 59, 0.06);
    --shadow-md: 0 8px 24px rgba(30, 42, 59, 0.1);
    --shadow-lg: 0 16px 48px rgba(30, 42, 59, 0.12);
    --shadow-primary: 0 8px 24px rgba(90, 103, 216, 0.25);
    
    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* 字体 */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* 过渡 */
    --transition: all 0.2s ease;
}

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

body {
    font-family: var(--font-family);
    background: var(--bg-body);
    color: var(--gray-900);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

/* =============================================
   导航栏
   ============================================= */
.navbar {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    padding: 0.75rem 0;
    z-index: 1000;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--dark) !important;
}

.brand-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.1rem;
}

.navbar-toggler {
    border: none;
    padding: 8px;
    font-size: 1.4rem;
    color: var(--gray-700);
}
.navbar-toggler:focus {
    box-shadow: none;
}

.navbar-nav .nav-link {
    color: var(--gray-700);
    font-weight: 500;
    font-size: 0.9rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
}
.navbar-nav .nav-link:hover {
    color: var(--primary);
    background: var(--primary-bg);
}
.navbar-nav .nav-link.active {
    color: var(--primary);
    background: var(--primary-bg);
}
.navbar-nav .nav-link i {
    font-size: 1rem;
}

.cart-badge {
    background: var(--primary);
    color: white;
    font-size: 0.7rem;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: 10px;
    min-width: 18px;
    text-align: center;
    display: inline-block;
    margin-left: auto;
}

/* 下拉菜单中的徽章样式 */
.dropdown-item {
    display: flex;
    align-items: center;
}

.dropdown-item .cart-badge {
    margin-left: auto;
}

.btn-admin {
    background: var(--dark);
    color: white !important;
    font-size: 0.85rem;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: 6px;
}
.btn-admin:hover {
    background: var(--gray-900);
    color: white !important;
}

/* 用户菜单样式 */
.user-menu {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px !important;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.user-menu:hover {
    background: var(--primary-bg);
    color: var(--primary) !important;
}

.user-menu i {
    font-size: 1.2rem;
}

/* 下拉菜单样式优化 */
.dropdown-menu {
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    margin-top: 8px;
    padding: 0.5rem 0;
}

.dropdown-item {
    padding: 0.625rem 1.25rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
}

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

.dropdown-item i {
    width: 20px;
    text-align: center;
}

/* =============================================
   主内容区
   ============================================= */
.main-content {
    flex: 1;
    padding: 2rem 0;
}

/* =============================================
   卡片样式
   ============================================= */
.card {
    background: var(--bg-card);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}
.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    background: transparent;
    border-bottom: 1px solid var(--gray-300);
    padding: 1rem 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
}

.card-body {
    padding: 1.25rem;
}

/* Hero 搜索区 */
.hero-search {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border-radius: var(--radius-xl);
    padding: 3rem 2rem;
    text-align: center;
    color: white;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-primary);
}
.hero-search h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}
.hero-search p {
    opacity: 0.9;
    margin-bottom: 1.5rem;
}

.search-box {
    max-width: 600px;
    margin: 0 auto;
    position: relative;
}
.search-box input {
    width: 100%;
    padding: 1rem 1.25rem;
    padding-right: 120px;
    font-size: 1rem;
    border: none;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
}
.search-box input:focus {
    outline: none;
    box-shadow: var(--shadow-lg), 0 0 0 3px rgba(255, 255, 255, 0.3);
}
.search-box input::placeholder {
    color: var(--gray-500);
}
.search-box button {
    position: absolute;
    right: 6px;
    top: 50%;
    transform: translateY(-50%);
    background: var(--primary);
    color: white;
    border: none;
    padding: 0.65rem 1.25rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}
.search-box button:hover {
    background: var(--primary-dark);
}

/* =============================================
   表格样式
   ============================================= */
.table {
    margin-bottom: 0;
}
.table thead th {
    background: var(--gray-100);
    color: var(--gray-700);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 0.875rem 1rem;
    border-bottom: 1px solid var(--gray-300);
    white-space: nowrap;
}
.table tbody td {
    padding: 1rem;
    vertical-align: middle;
    border-bottom: 1px solid var(--gray-300);
    color: var(--gray-900);
}
.table tbody tr:hover {
    background: var(--gray-100);
}
.table tbody tr:last-child td {
    border-bottom: none;
}

/* =============================================
   模块卡片（移动端）
   ============================================= */
.module-card {
    background: var(--bg-card);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin-bottom: 1rem;
    transition: var(--transition);
}
.module-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.module-card-images {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1rem;
}
.module-card-images img {
    width: 80px;
    height: 60px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    border: 1px solid var(--gray-300);
}

.module-card-info h6 {
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--gray-900);
}
.module-card-info p {
    font-size: 0.85rem;
    color: var(--gray-500);
    margin-bottom: 0.75rem;
}

.module-card-actions {
    display: flex;
    justify-content: flex-end;
}

/* =============================================
   按钮样式
   ============================================= */
.btn {
    font-weight: 500;
    border-radius: var(--radius-sm);
    padding: 0.5rem 1rem;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

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

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

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

.btn-outline-danger {
    color: var(--danger);
    border-color: var(--danger);
}
.btn-outline-danger:hover {
    background: var(--danger);
    border-color: var(--danger);
    color: white;
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
}

/* =============================================
   徽章样式
   ============================================= */
.badge {
    font-weight: 600;
    padding: 0.35em 0.65em;
    border-radius: 6px;
}

.badge.bg-success {
    background: rgba(72, 187, 120, 0.15) !important;
    color: var(--success);
}
.badge.bg-secondary {
    background: var(--gray-300) !important;
    color: var(--gray-700);
}
.badge.bg-info {
    background: rgba(66, 153, 225, 0.15) !important;
    color: var(--info);
}

/* =============================================
   图片缩略图
   ============================================= */
.img-thumbnail {
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-sm);
    padding: 2px;
    background: white;
}

/* =============================================
   空状态
   ============================================= */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--gray-500);
}
.empty-state i {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}
.empty-state p {
    margin-bottom: 1rem;
}

/* 现代化空状态样式 */
.empty-state-modern {
    text-align: center;
    padding: 4rem 2rem;
    min-height: 400px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.empty-state-icon {
    width: 120px;
    height: 120px;
    margin: 0 auto 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(90, 103, 216, 0.1) 0%, rgba(90, 103, 216, 0.05) 100%);
    border-radius: 50%;
    position: relative;
}

.empty-state-icon::before {
    content: '';
    position: absolute;
    width: 100px;
    height: 100px;
    border: 2px dashed rgba(90, 103, 216, 0.2);
    border-radius: 50%;
}

.empty-state-icon i {
    font-size: 3.5rem;
    color: var(--primary);
    opacity: 0.6;
    position: relative;
    z-index: 1;
}

.empty-state-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 0.75rem;
}

.empty-state-desc {
    font-size: 1rem;
    color: var(--gray-500);
    margin-bottom: 0;
    max-width: 400px;
}

.empty-state-modern .btn {
    box-shadow: 0 4px 12px rgba(90, 103, 216, 0.2);
    transition: all 0.3s ease;
}

.empty-state-modern .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(90, 103, 216, 0.3);
}

/* 响应式优化 */
@media (max-width: 768px) {
    .empty-state-modern {
        padding: 3rem 1rem;
        min-height: 300px;
    }
    
    .empty-state-icon {
        width: 100px;
        height: 100px;
    }
    
    .empty-state-icon i {
        font-size: 2.5rem;
    }
    
    .empty-state-title {
        font-size: 1.25rem;
    }
    
    .empty-state-desc {
        font-size: 0.9rem;
    }
}

/* =============================================
   清单列表项
   ============================================= */
.list-group-item {
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md) !important;
    margin-bottom: 0.75rem;
    padding: 1rem;
    transition: var(--transition);
}
.list-group-item:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-sm);
}

/* =============================================
   模态框
   ============================================= */
.modal-content {
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}
.modal-header {
    border-bottom: 1px solid var(--gray-300);
    padding: 1.25rem 1.5rem;
}
.modal-title {
    font-weight: 600;
}
.modal-body {
    padding: 1.5rem;
}
.modal-footer {
    border-top: 1px solid var(--gray-300);
    padding: 1rem 1.5rem;
}

/* =============================================
   表单样式
   ============================================= */
.form-control, .form-select {
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-sm);
    padding: 0.625rem 0.875rem;
    transition: var(--transition);
}
.form-control:focus, .form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-bg);
}
.form-label {
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
}

/* =============================================
   Alert 样式
   ============================================= */
.alert {
    border: none;
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
}

/* =============================================
   悬浮购物车按钮（移动端）
   ============================================= */
.fab-cart {
    position: fixed;
    right: 20px;
    bottom: 20px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-primary);
    z-index: 1000;
    transition: var(--transition);
}
.fab-cart:hover {
    color: white;
    transform: scale(1.05);
}
.fab-cart:active {
    transform: scale(0.95);
}
.fab-cart i {
    font-size: 1.4rem;
}
.fab-badge {
    position: absolute;
    top: -4px;
    right: -4px;
    background: var(--danger);
    color: white;
    font-size: 0.7rem;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: 10px;
    min-width: 18px;
    text-align: center;
}

/* =============================================
   页脚
   ============================================= */
.footer {
    background: var(--bg-card);
    border-top: 1px solid var(--gray-300);
    padding: 1.5rem 0;
    margin-top: auto;
    color: var(--gray-500);
    font-size: 0.85rem;
}

/* =============================================
   统计卡片
   ============================================= */
.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    text-align: center;
    transition: var(--transition);
}
.stat-card:hover {
    box-shadow: var(--shadow-md);
}
.stat-card .stat-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-size: 1.5rem;
}
.stat-card .stat-icon.primary {
    background: var(--primary-bg);
    color: var(--primary);
}
.stat-card .stat-icon.success {
    background: rgba(72, 187, 120, 0.15);
    color: var(--success);
}
.stat-card h3 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    color: var(--gray-900);
}
.stat-card p {
    color: var(--gray-500);
    margin: 0;
    font-size: 0.9rem;
}

/* =============================================
   响应式
   ============================================= */
@media (max-width: 991.98px) {
    .navbar-collapse {
        background: var(--bg-card);
        border-radius: var(--radius-md);
        padding: 1rem;
        margin-top: 0.5rem;
        box-shadow: var(--shadow-md);
    }
    .navbar-nav .nav-link {
        padding: 0.75rem 1rem;
    }
    .btn-admin {
        margin-top: 0.5rem;
        justify-content: center;
    }
}

@media (max-width: 767.98px) {
    .hero-search {
        padding: 2rem 1.5rem;
    }
    .hero-search h1 {
        font-size: 1.5rem;
    }
    .search-box input {
        padding-right: 100px;
    }
    .search-box button {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
    
    /* 隐藏桌面端表格，显示卡片 */
    .table-desktop {
        display: none;
    }
    .cards-mobile {
        display: block;
    }
}

@media (min-width: 768px) {
    /* 隐藏移动端卡片，显示表格 */
    .cards-mobile {
        display: none;
    }
    .table-desktop {
        display: block;
    }
    
    /* 表头吸顶 */
    .table thead th {
        position: sticky;
        top: 0;
        z-index: 10;
    }
}

/* =============================================
   动画
   ============================================= */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.3s ease forwards;
}