/* 自定义样式 */
:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #059669;
    --info-color: #0891b2;
    --warning-color: #d97706;
    --danger-color: #dc2626;
    --light-color: #f8fafc;
    --dark-color: #1e293b;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    /* 品牌色彩 */
    --brand-primary: #2563eb;
    --brand-secondary: #7c3aed;
    --brand-accent: #06b6d4;
    
    /* 文字颜色 */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --text-light: #cbd5e1;
    
    /* 背景色 */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

body {
    font-family: 'Inter', 'Microsoft YaHei', 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    font-weight: 400;
    letter-spacing: -0.01em;
}

/* 字体优化 */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.025em;
}

h1 { font-size: 2.25rem; line-height: 2.5rem; }
h2 { font-size: 1.875rem; line-height: 2.25rem; }
h3 { font-size: 1.5rem; line-height: 2rem; }
h4 { font-size: 1.25rem; line-height: 1.75rem; }
h5 { font-size: 1.125rem; line-height: 1.75rem; }
h6 { font-size: 1rem; line-height: 1.5rem; }

.text-muted {
    color: var(--text-secondary) !important;
}

.text-light {
    color: var(--text-light) !important;
}

/* 链接样式 */
a {
    color: var(--brand-primary);
    text-decoration: none;
    transition: color 0.15s ease-in-out;
}

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

/* 导航栏样式 - 白色背景 */
.navbar,
.navbar.navbar-expand-lg,
.navbar.navbar-light,
.navbar.bg-white,
nav.navbar {
    background: white !important;
    background-color: white !important;
    box-shadow: var(--shadow-md);
    border: none;
    z-index: 1030;
    border-bottom: 1px solid var(--gray-200);
}

/* 确保覆盖Bootstrap默认样式 */
.navbar.navbar-light {
    background-color: white !important;
}

.navbar.bg-white {
    background-color: white !important;
}

/* 强制白色导航栏 - 最高优先级 */
body .navbar,
html body .navbar,
.navbar-expand-lg.navbar-light.bg-white.fixed-top {
    background: #ffffff !important;
    background-color: #ffffff !important;
}

/* 移除可能的渐变背景 */
.navbar {
    background-image: none !important;
}

.navbar.fixed-top {
    position: fixed !important;
    top: 0;
    right: 0;
    left: 0;
}

/* 导航栏品牌标题 - 优化字体和颜色 */
.navbar-brand {
    font-weight: 600;
    font-size: 1.375rem;
    color: #2d3748 !important;
    letter-spacing: -0.01em;
    text-decoration: none;
    transition: color 0.2s ease;
}

.navbar-brand:hover {
    color: #1a202c !important;
    text-decoration: none;
}

.navbar-brand i {
    color: #3182ce;
    margin-right: 8px;
    font-size: 1.25rem;
}

/* 导航链接 - 优化字体大小和颜色 */
.navbar-nav .nav-link {
    color: #4a5568 !important;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.625rem 1rem !important;
    border-radius: 0.5rem;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    text-decoration: none;
    line-height: 1.4;
}

.navbar-nav .nav-link i {
    margin-right: 6px;
    font-size: 0.9rem;
    opacity: 0.8;
}

.navbar-nav .nav-link:hover {
    color: #2b6cb0 !important;
    background-color: #f7fafc;
    text-decoration: none;
    transform: translateY(-1px);
}

.navbar-nav .nav-link.active {
    color: #2b6cb0 !important;
    background-color: #ebf8ff;
    font-weight: 600;
}

/* 用户信息文本 - 优化显示 */
.navbar-text {
    color: #4a5568 !important;
    font-size: 0.9rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    margin: 0;
    padding: 0.5rem 0.75rem;
    background-color: #f8fafc;
    border-radius: 0.5rem;
    border: 1px solid #e2e8f0;
    transition: all 0.2s ease;
}

.navbar-text:hover {
    background-color: #ebf8ff;
    border-color: #bee3f8;
}

/* 用户信息专用样式 */
.navbar-text.user-info {
    margin-right: 0.5rem;
    padding: 0.5rem 0.875rem;
}

.navbar-text .user-name {
    color: #2d3748 !important;
    font-weight: 600;
    font-size: 0.9rem;
}

.navbar-text .user-station {
    color: #718096 !important;
    font-size: 0.8rem;
    margin-left: 0.375rem;
    font-weight: 400;
}

.navbar-text i {
    color: #4299e1 !important;
    font-size: 0.875rem;
}

.navbar-text small {
    color: #a0aec0 !important;
    font-size: 0.8rem;
}

/* 移动端导航切换按钮 - 优化样式 */
.navbar-toggler {
    border: 1px solid #cbd5e0;
    border-radius: 0.5rem;
    padding: 0.375rem 0.5rem;
    transition: all 0.2s ease;
}

.navbar-toggler:hover {
    border-color: #a0aec0;
    background-color: #f7fafc;
}

.navbar-toggler:focus {
    box-shadow: 0 0 0 2px rgba(66, 153, 225, 0.15);
    border-color: #4299e1;
}

.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%2874, 85, 104, 0.8%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    width: 1.25rem;
    height: 1.25rem;
}

/* 导航栏相关变量 */
:root {
    --navbar-height: 76px;
    --content-top-spacing: 2px; /* 精确的2px间距 */
    --total-top-margin: calc(var(--navbar-height) + var(--content-top-spacing));
}

/* 主内容区域适应固定导航栏 */
.main-content {
    padding-top: 78px; /* 默认：导航栏高度 + 2px间距 */
    min-height: calc(100vh - 76px); /* 降级处理 */
    min-height: calc(100vh - var(--navbar-height));
}

/* 首页特殊处理：移除padding，让banner直接控制间距 */
.main-content.home-page {
    padding-top: 0;
}

/* 下拉菜单 - 优化样式和字体 */
.dropdown-menu {
    border: 1px solid #e2e8f0;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    border-radius: 0.75rem;
    padding: 0.75rem;
    background: white;
    min-width: 200px;
    margin-top: 0.5rem;
}

.dropdown-header {
    color: #2d3748 !important;
    font-weight: 600;
    font-size: 0.875rem;
    padding: 0.5rem 1rem 0.25rem;
    margin-bottom: 0.25rem;
}

.dropdown-item {
    border-radius: 0.5rem;
    padding: 0.625rem 1rem;
    font-weight: 500;
    font-size: 0.9rem;
    transition: all 0.15s ease;
    color: #4a5568;
    text-decoration: none;
    display: flex;
    align-items: center;
}

.dropdown-item i {
    margin-right: 8px;
    font-size: 0.875rem;
    opacity: 0.7;
    width: 16px;
}

.dropdown-item:hover {
    background-color: #f7fafc;
    color: #2b6cb0;
    text-decoration: none;
    transform: translateX(2px);
}

.dropdown-item:active {
    background-color: #ebf8ff;
    color: #2c5aa0;
}

.dropdown-divider {
    border-color: #e2e8f0;
    margin: 0.5rem 0;
}

/* 用户下拉菜单按钮优化 */
.navbar-nav .nav-link.user-dropdown-toggle {
    padding: 0.5rem 0.75rem;
    margin-left: 0;
    border-radius: 0.5rem;
    background-color: #f8fafc;
    border: 1px solid #e2e8f0;
    color: #4a5568 !important;
    min-width: 40px;
    justify-content: center;
}

.navbar-nav .nav-link.user-dropdown-toggle:hover {
    background-color: #ebf8ff;
    border-color: #bee3f8;
    color: #2b6cb0 !important;
}

.navbar-nav .nav-link.user-dropdown-toggle i {
    font-size: 0.8rem;
    margin: 0;
}

/* 移动端用户信息显示 */
.navbar-nav .nav-link.user-dropdown-toggle .d-lg-none {
    margin-left: 0.5rem;
    font-weight: 500;
}

/* 用户信息区域整体布局 */
.navbar-nav.align-items-center {
    gap: 0.25rem;
}

/* 桌面端用户信息和下拉按钮的紧密布局 */
@media (min-width: 992px) {
    .navbar-nav .nav-item.d-none.d-lg-block + .nav-item.dropdown {
        margin-left: 0;
    }
    
    .navbar-text.user-info {
        border-top-right-radius: 0;
        border-bottom-right-radius: 0;
        border-right: none;
        margin-right: 0;
    }
    
    .nav-link.user-dropdown-toggle {
        border-top-left-radius: 0;
        border-bottom-left-radius: 0;
        border-left: none;
    }
}

.dropdown-header {
    color: var(--text-primary);
    font-weight: 600;
}

.dropdown-divider {
    border-color: var(--gray-200);
}

/* 课程卡片样式 */
.course-card {
    transition: all 0.3s ease;
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
    border-radius: 1rem;
    overflow: hidden;
    background: var(--bg-primary);
}

.course-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--brand-primary);
}

.course-card .card-img-top {
    border-radius: 0;
}

.course-card .card-body {
    padding: 1.5rem;
}

.course-card .card-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    font-size: 1.125rem;
}

.course-card .card-text {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.5;
}

.course-card .badge {
    font-weight: 500;
    padding: 0.375rem 0.75rem;
    border-radius: 0.5rem;
    font-size: 0.75rem;
}

.course-card .card-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--gray-200);
    padding: 1rem 1.5rem;
}

/* 知识点树形菜单 */
.knowledge-tree {
    max-height: 600px;
    overflow-y: auto;
}

.knowledge-tree .list-group-item {
    border: none;
    padding: 0.5rem 1rem;
}

.knowledge-tree .list-group-item.active {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

/* 内容区域 */
.content-area {
    min-height: 500px;
    background: white;
    border-radius: 0.375rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

/* AI聊天界面 */
.chat-container {
    height: 500px;
    overflow-y: auto;
    border: 1px solid #dee2e6;
    border-radius: 0.375rem;
    padding: 1rem;
}

.chat-message {
    margin-bottom: 1rem;
}

.chat-message.user {
    text-align: right;
}

.chat-message.ai {
    text-align: left;
}

.chat-bubble {
    display: inline-block;
    padding: 0.75rem 1rem;
    border-radius: 1rem;
    max-width: 70%;
}

.chat-bubble.user {
    background-color: var(--primary-color);
    color: white;
}

.chat-bubble.ai {
    background-color: var(--light-color);
    color: var(--dark-color);
}

/* 思维导图容器 */
.mindmap-container {
    width: 100%;
    height: 600px;
    border: 1px solid #dee2e6;
    border-radius: 0.375rem;
    background: white;
}

/* 广告轮播 */
.banner-carousel {
    height: 480px; /* 增加高度到480px，让图片显示更完整 */
    overflow: hidden;
    border-radius: 0;
    margin-bottom: 0;
    margin-top: 60px; /* 增加到60px，确保banner完全显示 */
}

.banner-slide {
    height: 480px; /* 同步增加banner-slide高度到480px */
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background-size: cover !important;
    background-position: center !important;
    background-repeat: no-repeat !important;
}
}

.banner-content {
    text-align: center;
    z-index: 2;
}

.bg-gradient-primary {
    background: linear-gradient(135deg, #0d6efd 0%, #0056b3 100%);
}

.bg-gradient-success {
    background: linear-gradient(135deg, #198754 0%, #146c43 100%);
}

.bg-gradient-info {
    background: linear-gradient(135deg, #0dcaf0 0%, #0aa2c0 100%);
}

.bg-gradient-light {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

/* 响应式设计 */
@media (max-width: 768px) {
    :root {
        --navbar-height: 60px;
        --content-top-spacing: 2px; /* 移动端也保持2px间距 */
    }
    
    .knowledge-tree {
        max-height: 300px;
    }
    
    .content-area {
        margin-top: 1rem;
    }
    
    .chat-bubble {
        max-width: 85%;
    }
    
    .banner-carousel {
        height: 280px; /* 移动端也增加高度，从250px到280px */
    }
    
    .banner-slide {
        height: 280px; /* 同步增加移动端banner-slide高度 */
    }
    
    .banner-content h2 {
        font-size: 1.5rem;
    }
}

/* 动画效果 */
@keyframes spin {
    to { transform: rotate(360deg); }
}

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

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

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--gray-200);
    border-radius: 50%;
    border-top-color: var(--brand-primary);
    animation: spin 1s ease-in-out infinite;
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

.slide-in-up {
    animation: slideInUp 0.6s ease-out;
}

.pulse-hover:hover {
    animation: pulse 0.6s ease-in-out;
}

/* 渐变背景 */
.gradient-bg {
    background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-secondary) 100%);
}

.gradient-text {
    background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

/* 特殊效果 */
.glass-effect {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.neon-glow {
    box-shadow: 0 0 20px rgba(37, 99, 235, 0.3);
}

.text-shadow {
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* 悬浮效果 */
.hover-lift {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

/* 状态指示器 */
.status-indicator {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-right: 0.5rem;
}

.status-indicator.online {
    background: var(--success-color);
    box-shadow: 0 0 0 2px rgba(5, 150, 105, 0.2);
}

.status-indicator.offline {
    background: var(--gray-400);
}

.status-indicator.busy {
    background: var(--warning-color);
    box-shadow: 0 0 0 2px rgba(217, 119, 6, 0.2);
}

/* 表单样式 */
.form-floating > label {
    color: var(--secondary-color);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

/* 按钮样式 */
.btn {
    border-radius: 0.75rem;
    font-weight: 600;
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    letter-spacing: -0.01em;
    transition: all 0.2s ease;
    border: none;
}

.btn-lg {
    padding: 0.875rem 2rem;
    font-size: 1rem;
    border-radius: 1rem;
}

.btn-sm {
    padding: 0.375rem 0.875rem;
    font-size: 0.8125rem;
    border-radius: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--brand-primary) 0%, var(--primary-dark) 100%);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--brand-primary) 100%);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color) 0%, #047857 100%);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-success:hover {
    background: linear-gradient(135deg, #047857 0%, var(--success-color) 100%);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-outline-primary:hover {
    background: var(--brand-primary);
    border-color: var(--brand-primary);
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-outline-secondary {
    border: 2px solid var(--gray-300);
    color: var(--text-secondary);
    background: transparent;
}

.btn-outline-secondary:hover {
    background: var(--gray-100);
    border-color: var(--gray-400);
    color: var(--text-primary);
}

/* 卡片样式 */
.card {
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    border-radius: 1rem;
    background: var(--bg-primary);
    transition: all 0.2s ease;
}

.card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--gray-300);
}

.card-header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--gray-200);
    padding: 1.25rem 1.5rem;
    border-radius: 1rem 1rem 0 0 !important;
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--gray-200);
    padding: 1rem 1.5rem;
    border-radius: 0 0 1rem 1rem !important;
}

.card-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

/* 特色卡片 */
.card.feature-card {
    border: 2px solid transparent;
    background: linear-gradient(white, white) padding-box,
                linear-gradient(135deg, var(--brand-primary), var(--brand-secondary)) border-box;
}

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

/* 进度条 */
.progress {
    height: 8px;
    border-radius: 4px;
}

/* 徽章样式 */
.badge {
    font-weight: 600;
    padding: 0.375rem 0.75rem;
    border-radius: 0.5rem;
    font-size: 0.75rem;
    letter-spacing: 0.025em;
}

.badge.bg-success {
    background: linear-gradient(135deg, var(--success-color) 0%, #047857 100%) !important;
}

.badge.bg-primary {
    background: linear-gradient(135deg, var(--brand-primary) 0%, var(--primary-dark) 100%) !important;
}

.badge.bg-warning {
    background: linear-gradient(135deg, var(--warning-color) 0%, #ea580c 100%) !important;
    color: white !important;
}

.badge.bg-info {
    background: linear-gradient(135deg, var(--info-color) 0%, #0e7490 100%) !important;
}

.badge.bg-secondary {
    background: linear-gradient(135deg, var(--gray-500) 0%, var(--gray-600) 100%) !important;
}

/* 图标样式 */
.bi {
    vertical-align: -0.125em;
}

/* 输入框样式 */
.form-control {
    border: 2px solid var(--gray-200);
    border-radius: 0.75rem;
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    transition: all 0.2s ease;
    background: var(--bg-primary);
}

.form-control:focus {
    border-color: var(--brand-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    background: var(--bg-primary);
}

.form-label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

/* 表格样式 */
.table {
    border-collapse: separate;
    border-spacing: 0;
}

.table th {
    background: var(--bg-secondary);
    border-bottom: 2px solid var(--gray-200);
    font-weight: 600;
    color: var(--text-primary);
    padding: 1rem;
}

.table td {
    padding: 1rem;
    border-bottom: 1px solid var(--gray-200);
    vertical-align: middle;
}

.table-hover tbody tr:hover {
    background-color: var(--bg-tertiary);
}

/* 分页样式 */
.pagination .page-link {
    border: 2px solid var(--gray-200);
    color: var(--text-secondary);
    padding: 0.5rem 0.75rem;
    margin: 0 0.125rem;
    border-radius: 0.5rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.pagination .page-link:hover {
    background: var(--brand-primary);
    border-color: var(--brand-primary);
    color: white;
}

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

/* 模态框样式 */
.modal-content {
    border: none;
    border-radius: 1rem;
    box-shadow: var(--shadow-xl);
}

.modal-header {
    border-bottom: 1px solid var(--gray-200);
    padding: 1.5rem;
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    border-top: 1px solid var(--gray-200);
    padding: 1.5rem;
}

.modal-title {
    font-weight: 600;
    color: var(--text-primary);
}

/* 列表组样式 */
.list-group-item {
    border-color: rgba(0,0,0,0.1);
}

.list-group-item:hover {
    background-color: rgba(0,0,0,0.02);
}

/* 合作伙伴部分样式 */
.partners-section {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    position: relative;
}

.partners-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    margin-top: 1.5rem;
}

.partners-content {
    text-align: center;
}

.partners-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.partners-title i {
    color: #4ecdc4;
    font-size: 1.5rem;
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.5rem;
    align-items: center;
    justify-items: center;
    max-width: 900px;
    margin: 0 auto;
}

.partner-item {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.25rem;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 0.75rem;
    transition: all 0.3s ease;
    cursor: default;
    width: 100%;
    height: 100px;
    max-width: 200px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.partner-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 0, 0, 0.05), transparent);
    transition: left 0.6s ease;
}

.partner-item:hover::before {
    left: 100%;
}

.partner-item:hover {
    background: rgba(255, 255, 255, 1);
    border-color: rgba(0, 0, 0, 0.1);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.partner-logo {
    max-width: 140px;
    max-height: 60px;
    width: auto;
    height: auto;
    object-fit: contain;
    filter: brightness(1) contrast(1.1) saturate(1);
    transition: all 0.3s ease;
    display: block;
    margin: 0 auto;
}

.partner-name {
    position: absolute;
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 11px;
    font-weight: 500;
    color: #555555;
    text-align: center;
    white-space: nowrap;
    letter-spacing: 0.3px;
    opacity: 0.8;
    transition: all 0.3s ease;
    text-shadow: 0 1px 2px rgba(255, 255, 255, 0.8);
}

.partner-item:hover .partner-logo {
    filter: brightness(1.05) contrast(1.2) saturate(1.1);
    transform: scale(1.08);
}

.partner-item:hover .partner-name {
    color: #333333;
    opacity: 1;
    font-weight: 600;
    transform: translateX(-50%);
}

/* 针对不同合作伙伴的特殊样式调整 - 统一白色背景 */
.partner-item:nth-child(1),
.partner-item:nth-child(2),
.partner-item:nth-child(3),
.partner-item:nth-child(4) {
    background: rgba(255, 255, 255, 0.95) !important;
    border-color: rgba(0, 0, 0, 0.1) !important;
}

.partner-item:nth-child(1):hover,
.partner-item:nth-child(2):hover,
.partner-item:nth-child(3):hover,
.partner-item:nth-child(4):hover {
    background: rgba(255, 255, 255, 1) !important;
    border-color: rgba(0, 0, 0, 0.15) !important;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15) !important;
}

/* 合作伙伴响应式设计 */
@media (max-width: 768px) {
    .partners-section {
        margin-bottom: 1rem;
        padding-bottom: 0.75rem;
    }
    
    .partners-title {
        font-size: 1.1rem;
        margin-bottom: 1rem;
    }
    
    .partners-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
        max-width: 400px;
    }
    
    .partner-item {
        padding: 1rem;
        height: 80px;
        max-width: none;
    }
    
    .partner-logo {
        max-width: 120px;
        max-height: 50px;
    }
    
    .partner-name {
        font-size: 10px;
        bottom: 3px;
        font-weight: 500;
    }
}

@media (max-width: 480px) {
    .partners-grid {
        grid-template-columns: 1fr;
        gap: 0.75rem;
        max-width: 250px;
    }
    
    .partner-item {
        padding: 0.75rem;
        height: 70px;
    }
    
    .partner-logo {
        max-width: 100px;
        max-height: 40px;
    }
    
    .partner-name {
        font-size: 10px;
        padding: 2px 8px;
        bottom: 4px;
        border-radius: 8px;
    }
    
    .partner-logo {
        max-width: 100px;
        max-height: 40px;
    }
    
    .partners-title {
        flex-direction: column;
        gap: 0.5rem;
        font-size: 1rem;
    }
}

/* 加载动画 */
@keyframes partnerFadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.partner-item {
    animation: partnerFadeIn 0.6s ease-out;
}

.partner-item:nth-child(1) { animation-delay: 0.1s; }
.partner-item:nth-child(2) { animation-delay: 0.2s; }
.partner-item:nth-child(3) { animation-delay: 0.3s; }
.partner-item:nth-child(4) { animation-delay: 0.4s; }

/* 减少动画偏好支持 */
@media (prefers-reduced-motion: reduce) {
    .partner-item {
        animation: none;
    }
    
    .partner-item::before {
        display: none;
    }
    
    .partner-item:hover .partner-logo {
        transform: none;
    }
}