/* 基础变量定义 */
    :root {
        --primary: #ef782b;
        --primary-light: #f1ab7c;
        --primary-dark: #ef782b;
        --neutral-50: #fafafa;
        --neutral-100: #f5f5f5;
        --neutral-200: #e5e5e5;
        --neutral-300: #d4d4d4;
        --neutral-500: #71717a;
        --neutral-600: #52525b;
        --neutral-800: #262626;
        --neutral-900: #171717;
        --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
        --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
        --radius: 0.75rem;
        --transition: all 0.3s ease;
    }

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

    ul {
        list-style: none;
    }

    button {
        cursor: pointer;
        background: none;
        border: none;
        font-family: inherit;
    }

    .container {
        width: 100%;
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 1rem;
    }

    /* 动画效果 */
    @keyframes fadeIn {
        from {
            opacity: 0;
        }

        to {
            opacity: 1;
        }
    }

    @keyframes slideUp {
        from {
            transform: translateY(20px);
            opacity: 0;
        }

        to {
            transform: translateY(0);
            opacity: 1;
        }
    }

    header {
        position: sticky;
    }

    header i {
        color: #333333 !important;
    }

    .animate-fade-in {
        animation: fadeIn 0.5s ease-in-out;
    }

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

    /* 二级栏目导航 */
    .secondary-nav {
        background-color: white;
        border-bottom: 1px solid var(--neutral-100);
    }

    @media (min-width: 768px) {
        .secondary-nav {
            top: 5rem;
        }
    }

    .secondary-nav-container {
        display: flex;
        overflow-x: auto;
        padding: 0.75rem 1rem;
        scrollbar-width: none;
    }

    .secondary-nav-container::-webkit-scrollbar {
        display: none;
    }

    .category-btn {
        white-space: nowrap;
        padding: 0.5rem 1rem;
        margin-right: 0.25rem;
        font-size: 0.875rem;
        font-weight: 500;
        color: var(--neutral-600);
        transition: color 0.3s ease;
        position: relative;
    }

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

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

    .category-btn.active::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 0;
        width: 100%;
        height: 2px;
        background-color: var(--primary);
    }

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

    @media (min-width: 768px) {
        .main-content {
            padding: 3rem 0;
        }
    }

    .content-wrapper {
        display: flex;
        flex-direction: column;
        gap: 2rem;
    }

    @media (min-width: 1024px) {
        .content-wrapper {
            flex-direction: row;
        }
    }

    .news-section {
        flex: 3;
    }

    .section-header {
        margin-bottom: 2rem;
    }

    .section-title {
        font-size: clamp(1.5rem, 3vw, 2.5rem);
        font-weight: 700;
        font-family: 'Poppins', sans-serif;
        color: var(--neutral-900);
        margin-bottom: 0.5rem;
    }

    .section-subtitle {
        color: var(--neutral-500);
    }

    /* 头条新闻 */
    .featured-news {
        background-color: white;
        border-radius: var(--radius);
        box-shadow: var(--shadow-sm);
        padding: 1.5rem;
        margin-bottom: 2rem;
        transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .featured-news:hover {
        transform: translateY(-4px);
        box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05);
    }

    .category-pill {
        display: inline-block;
        padding: 0.125rem 0.625rem;
        font-size: 0.75rem;
        font-weight: 500;
        border-radius: 999px;
        margin-bottom: 0.75rem;
    }

    .pill-primary {
        background-color: rgba(255, 175, 122, 0.1);
        color: var(--primary);
    }

    .news-title {
        font-size: 1.5rem;
        font-weight: 700;
        margin-bottom: 0.75rem;
        line-height: 1.3;
        transition: color 0.3s ease;
    }

    @media (min-width: 768px) {
        .news-title {
            font-size: 2rem;
        }
    }

    .news-title:hover {
        color: var(--primary);
    }

    .news-summary {
        color: var(--neutral-600);
        margin-bottom: 1rem;
    }

    .news-meta {
        display: flex;
        align-items: center;
        font-size: 0.875rem;
        color: var(--neutral-500);
        gap: 1.5rem;
    }

    .meta-item {
        display: flex;
        align-items: center;
        gap: 0.25rem;
    }

    /* 新闻列表 - 两列布局 */
    .news-grid {
        display: grid;
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    @media (min-width: 768px) {
        .news-grid {
            grid-template-columns: repeat(2, 1fr);
        }
    }

    .news-card {
        background-color: white;
        border-radius: var(--radius);
        box-shadow: var(--shadow-sm);
        padding: 1.5rem;
        transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .news-card:hover {
        transform: translateY(-4px);
        box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05);
    }

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

    /* 分页控件 */
    .pagination {
        display: flex;
        justify-content: center;
        margin-top: 3rem;
    }

    .pagination-group {
        display: inline-flex;
        border-radius: 0.5rem;
        box-shadow: var(--shadow-sm);
    }

    .page-btn {
        display: flex;
        align-items: center;
        gap: 0.5rem;
        padding: 0.5rem 1rem;
        font-size: 0.875rem;
        font-weight: 500;
        border: 1px solid var(--neutral-200);
        background-color: white;
        color: var(--neutral-600);
        transition: background-color 0.3s ease;
    }

    .page-btn:hover {
        background-color: var(--neutral-50);
    }

    .page-btn:first-child {
        border-radius: 0.5rem 0 0 0.5rem;
    }

    .page-btn:last-child {
        border-radius: 0 0.5rem 0.5rem 0;
    }

    .page-btn.active {
        background-color: var(--primary);
        color: white;
        border-color: var(--primary);
    }

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

    .page-btn:disabled {
        opacity: 0.5;
        cursor: not-allowed;
    }

    /* 侧边栏 */
    .sidebar {
        flex: 1;
        display: flex;
        flex-direction: column;
        gap: 2rem;
    }

    .sidebar-card {
        background-color: white;
        border-radius: var(--radius);
        box-shadow: var(--shadow-sm);
        padding: 1.5rem;
    }

    .sidebar-title {
        font-size: 1.125rem;
        font-weight: 700;
        font-family: 'Poppins', sans-serif;
        margin-bottom: 1rem;
        display: flex;
        align-items: center;
        gap: 0.5rem;
    }

    .editor-picks {
        display: flex;
        flex-direction: column;
        gap: 1.25rem;
    }

    .pick-item {
        transition: color 0.3s ease;
    }

    .pick-item:hover {
        color: var(--primary);
    }

    .pick-title {
        font-weight: 500;
        margin-bottom: 0.25rem;
    }

    .pick-date {
        font-size: 0.75rem;
        color: var(--neutral-500);
    }

    .divider {
        width: 100%;
        height: 1px;
        background-color: var(--neutral-100);
    }