/* 理财投教网 - 基础样式表 */

:root {
    --primary-blue: #0066CC;
    --primary-blue-light: #E8F4FD;
    --primary-blue-dark: #004C99;
    --accent-teal: #00A086;
    --accent-teal-light: #E6F7F3;
    --text-dark: #1A1A1A;
    --text-gray: #666666;
    --text-light: #999999;
    --bg-white: #FFFFFF;
    --bg-light: #F8FAFC;
    --bg-gray: #F1F5F9;
    --border-color: #E2E8F0;
    --success: #10B981;
    --danger: #EF4444;
    --warning: #F59E0B;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background-color: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: inherit;
}

ul, ol {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部 */
.header {
    background: var(--bg-white);
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-top {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--accent-teal) 100%);
    padding: 8px 0;
    color: white;
    font-size: 13px;
}

.header-top .container {
    display: flex;
    justify-content: space-between;
}

.header-top a {
    color: rgba(255,255,255,0.9);
}

.header-top a:hover {
    color: white;
}

.header-main {
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.header-main .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--primary-blue);
}

.logo i {
    font-size: 32px;
}

.logo-text h1 {
    font-size: 20px;
    font-weight: 700;
}

.logo-text span {
    font-size: 12px;
    color: var(--text-light);
}

/* 导航菜单 */
.nav-menu {
    display: flex;
    gap: 8px;
}

.nav-menu li a {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 15px;
    transition: all 0.2s;
}

.nav-menu li a:hover,
.nav-menu li a.active {
    background: var(--primary-blue-light);
    color: var(--primary-blue);
}

.mobile-menu-btn {
    display: none;
    padding: 8px 12px;
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
}

/* 页面标题 */
.page-header {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--accent-teal) 100%);
    color: white;
    padding: 3rem 0;
    text-align: center;
}

.page-header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.page-header p {
    opacity: 0.9;
}

/* 主内容 */
.main-content {
    padding: 24px 0;
    min-height: calc(100vh - 300px);
}

/* 课程卡片 */
.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.course-card {
    background: var(--bg-white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    transition: all 0.3s;
}

.course-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}

.course-card-img {
    position: relative;
    height: 160px;
    overflow: hidden;
}

.course-card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.course-card-badge {
    position: absolute;
    top: 10px;
    left: 10px;
}

.badge-hot {
    background: linear-gradient(135deg, #ff6b6b, #ee5a24);
    color: white;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 12px;
}

.course-card-vip {
    position: absolute;
    top: 10px;
    right: 10px;
    background: linear-gradient(135deg, #ffd700, #ffb347);
    color: white;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
}

.course-card-vip.free {
    background: linear-gradient(135deg, var(--success), #059669);
}

.course-card-body {
    padding: 16px;
}

.course-card-category {
    color: var(--primary-blue);
    font-size: 12px;
    margin-bottom: 8px;
}

.course-card-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
    line-height: 1.4;
}

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

.course-card-teacher,
.course-card-meta {
    font-size: 13px;
    color: var(--text-gray);
    display: flex;
    gap: 12px;
    margin-top: 8px;
}

/* 课程分类 */
.course-categories {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.category-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--bg-white);
    border-radius: 24px;
    font-size: 14px;
    transition: all 0.2s;
    border: 1px solid var(--border-color);
}

.category-item:hover,
.category-item.active {
    background: var(--primary-blue);
    color: white;
    border-color: var(--primary-blue);
}

.category-item .count {
    background: rgba(0,0,0,0.1);
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 12px;
}

/* 筛选条件 */
.course-filters {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
    padding: 16px;
    background: var(--bg-white);
    border-radius: 12px;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.filter-group label {
    font-size: 14px;
    color: var(--text-gray);
}

.filter-group select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
}

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 32px;
}

.pagination a,
.pagination .page-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 12px;
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.2s;
}

.pagination a:hover,
.pagination .page-btn:hover,
.pagination .page-btn.active {
    background: var(--primary-blue);
    color: white;
    border-color: var(--primary-blue);
}

.pagination .disabled {
    opacity: 0.5;
    pointer-events: none;
}

/* 热门课程 */
.hot-courses {
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--border-color);
}

.hot-courses-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--danger);
}

.hot-courses-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.hot-course-item {
    display: flex;
    gap: 12px;
    padding: 12px;
    background: var(--bg-white);
    border-radius: 12px;
    transition: all 0.2s;
}

.hot-course-item:hover {
    background: var(--primary-blue-light);
}

.hot-course-img {
    width: 100px;
    height: 70px;
    border-radius: 8px;
    overflow: hidden;
    flex-shrink: 0;
}

.hot-course-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hot-course-title {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
}

.hot-course-meta {
    font-size: 12px;
    color: var(--text-light);
}

/* 文章卡片 */
.article-list-section {
    background: var(--bg-white);
    border-radius: 16px;
    padding: 24px;
}

.article-cards {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.article-card {
    display: flex;
    gap: 20px;
    padding: 20px;
    background: var(--bg-light);
    border-radius: 12px;
    transition: all 0.2s;
}

.article-card:hover {
    background: var(--primary-blue-light);
}

.article-card h3 {
    font-size: 18px;
    margin-bottom: 8px;
}

.article-card h3 a:hover {
    color: var(--primary-blue);
}

.article-summary {
    font-size: 14px;
    color: var(--text-gray);
    margin-bottom: 12px;
}

.article-meta {
    display: flex;
    gap: 16px;
    font-size: 13px;
    color: var(--text-light);
}

/* 底部 */
.footer {
    background: var(--bg-white);
    border-top: 1px solid var(--border-color);
    margin-top: 48px;
}

.footer-top {
    padding: 40px 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
}

.footer-col h3 {
    font-size: 18px;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-col p {
    font-size: 14px;
    color: var(--text-gray);
    margin-bottom: 8px;
}

.footer-col h4 {
    font-size: 16px;
    margin-bottom: 16px;
}

.footer-col ul li {
    margin-bottom: 8px;
}

.footer-col ul li a:hover {
    color: var(--primary-blue);
}

.footer-social {
    display: flex;
    gap: 12px;
    margin-top: 16px;
}

.footer-social a {
    width: 36px;
    height: 36px;
    background: var(--bg-gray);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.footer-social a:hover {
    background: var(--primary-blue);
    color: white;
}

.footer-bottom {
    padding: 20px 0;
    border-top: 1px solid var(--border-color);
    text-align: center;
    font-size: 14px;
    color: var(--text-light);
}

.footer-bottom a {
    color: var(--text-gray);
}

.footer-bottom a:hover {
    color: var(--primary-blue);
}

/* 响应式 */
@media (max-width: 768px) {
    .mobile-menu-btn {
        display: block;
    }
    
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-white);
        flex-direction: column;
        padding: 12px;
        box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .course-grid {
        grid-template-columns: 1fr;
    }
    
    .course-categories {
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 8px;
    }
    
    .course-filters {
        flex-direction: column;
    }
    
    .hot-courses-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-light);
}

.empty-state i {
    font-size: 48px;
    margin-bottom: 16px;
}

.empty-state p {
    font-size: 16px;
}

/* ==================== 移动端优化样式 ==================== */

/* 全局图片自适应 */
img {
    max-width: 100%;
    height: auto;
}

/* 文章内容图片移动端优化 */
@media (max-width: 768px) {
    /* 文章内容图片限制 */
    .article-content img,
    .cc img,
    .content-body img,
    .article-body img {
        max-width: 90% !important;
        width: 90% !important;
        margin: 12px auto !important;
        display: block !important;
        height: auto !important;
    }
    
    /* 卡片列表图片优化 */
    .card-item-image {
        width: 80px !important;
        height: 60px !important;
        flex-shrink: 0;
    }
    
    .card-item-image img {
        width: 100% !important;
        height: 100% !important;
        object-fit: cover;
    }
    
    /* 文章卡片优化 */
    .article-card {
        flex-direction: column !important;
        gap: 12px !important;
        padding: 16px !important;
    }
    
    .article-card img,
    .article-card .article-image {
        width: 100% !important;
        max-width: 100% !important;
        height: auto !important;
        margin: 0 auto 12px !important;
        display: block !important;
    }
    
    /* 课程卡片图片优化 */
    .course-card-img {
        height: 140px !important;
    }
    
    .course-card-img img {
        max-width: 100% !important;
        height: 100% !important;
        object-fit: cover;
    }
    
    /* 热门课程图片优化 */
    .hot-course-img {
        width: 80px !important;
        height: 60px !important;
        flex-shrink: 0;
    }
    
    .hot-course-img img {
        width: 100% !important;
        height: 100% !important;
        object-fit: cover;
    }
    
    /* 新闻列表卡片优化 */
    .news-card {
        padding: 12px !important;
    }
    
    .news-card img {
        max-width: 100% !important;
        height: auto !important;
        border-radius: 6px !important;
    }
    
    /* 列表项间距优化 */
    .card-list {
        gap: 12px !important;
    }
    
    .card-item {
        padding-bottom: 12px !important;
        gap: 10px !important;
    }
    
    /* banner图片优化 */
    .banner-slide img,
    .banner-main img {
        max-height: 200px !important;
        object-fit: cover !important;
    }
    
    /* 侧边栏图片优化 */
    .sidebar-item img,
    .aside img {
        max-width: 100% !important;
        height: auto !important;
    }
    
    /* 公司/基金列表图片 */
    .company-logo img,
    .fund-logo img {
        max-width: 60px !important;
        height: auto !important;
    }
    
    /* 表格横向滚动 */
    .table-wrapper,
    table {
        font-size: 13px !important;
    }
}

/* 超小屏幕额外优化 */
@media (max-width: 480px) {
    .card-item-image {
        width: 70px !important;
        height: 52px !important;
    }
    
    .article-content img,
    .cc img {
        max-width: 95% !important;
        width: 95% !important;
        margin: 10px auto !important;
    }
    
    .course-card-img {
        height: 120px !important;
    }
    
    .hot-course-img {
        width: 70px !important;
        height: 52px !important;
    }
}

/* 图片加载占位 */
img[src=] {
    display: none;
}

/* 图片懒加载优化 */
img {
    loading: lazy;
}