* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
    background-color: #f5f5f5;
    margin: 0;
    padding: 20px;
    border: 6px solid #1d9bf0;
    min-height: 100vh;
    line-height: 1.4;
    display: flex;
    flex-direction: column;
}

/* 修复导航栏对齐问题 - 添加与content-wrapper相同的宽度限制 */
.nav {
    width: 70%;
    margin: 0 auto 20px auto;
    text-align: center;
}

.nav a {
    color: #1d9bf0;
    text-decoration: none;
    margin: 0 10px;
    font-size: 18px;
}

.nav a:hover {
    text-decoration: underline;
}

.content-wrapper {
    width: 70%;
    margin: 0 auto;
    display: flex;
    align-items: flex-start;
    flex: 1;
}

.sidebar {
    width: 30%;
    padding: 20px;
    background-color: rgba(255, 255, 255, 0.9);
    border-radius: 10px;
    margin-right: 20px;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
}

.sidebar-title {
    color: #1d9bf0;
    font-size: 20px;
    margin-bottom: 15px;
    text-align: center;
    border-bottom: 2px solid #1d9bf0;
    padding-bottom: 10px;
}

.tree-container {
    font-size: 14px;
}

.tree-item {
    margin: 2px 0;
}

.tree-node {
    display: flex;
    align-items: center;
    padding: 4px 8px;
    cursor: pointer;
    border-radius: 6px;
    transition: background-color 0.2s ease;
    position: relative;
}

.tree-node:hover {
    background-color: rgba(29, 155, 240, 0.1);
}

.tree-icon {
    width: 16px;
    height: 16px;
    margin-right: 8px;
    flex-shrink: 0;
    font-size: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.tree-toggle {
    flex: 1;
    color: #1d9bf0;
    font-weight: 500;
    user-select: none;
}

.tree-link {
    flex: 1;
    color: #1d9bf0;
    text-decoration: none;
    font-weight: 400;
}

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

.tree-arrow {
    color: #1d9bf0;
    font-size: 10px;
    margin-left: 4px;
    transition: transform 0.2s ease;
}

.tree-item.expanded .tree-arrow {
    transform: rotate(90deg);
}

.tree-children {
    margin-left: 24px;
    display: none;
    border-left: 1px solid rgba(29, 155, 240, 0.2);
    padding-left: 8px;
    position: relative;
}

.tree-children::before {
    content: '';
    position: absolute;
    left: -1px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: linear-gradient(to bottom, rgba(29, 155, 240, 0.3), transparent);
}

.tree-item.expanded .tree-children {
    display: block;
}

.file-item .tree-node {
    padding-left: 12px;
}

.file-item .tree-icon {
    opacity: 0.8;
}

.main-content {
    flex: 1;
}

.container {
    background-color: rgba(255, 255, 255, 0.9);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.title {
    margin: 0 0 20px 0;
    padding: 15px 20px;
    background-color: rgba(255, 255, 255, 0.9);
    text-align: center;
    border-radius: 16px;
}

.current-time {
    font-size: 28px;
    font-weight: 600;
    color: #1d9bf0;
    margin-bottom: 15px;
}

.progress-container {
    background-color: #f0f2f5;
    border: 2px solid #1d9bf0;
    border-radius: 10px;
    height: 60px;
    overflow: hidden;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
}

.progress-bar {
    height: 100%;
    background-color: #1d9bf0;
    transition: width 0.3s ease;
    position: absolute;
    left: 0;
    top: 0;
    z-index: 1;
}

.progress-text {
    position: relative;
    z-index: 2;
    color: #333;
    font-size: 26px;
    font-weight: 600;
    text-align: center;
    white-space: nowrap;
    text-shadow: 0 0 4px rgba(255, 255, 255, 0.8);
}

.item {
    border: 2px solid #1d9bf0;
    border-radius: 24px;
    padding: 20px 24px;
    margin: 0 auto 20px;
    background-color: rgba(255, 255, 255, 0.95);
    text-align: left;
    font-size: 28px;
    font-weight: 400;
    color: #1d9bf0;
    transition: all 0.2s ease;
    position: relative;
    display: flex;
    flex-direction: column;
    min-height: 120px;
    max-width: 800px;
}

.item:hover {
    background-color: rgba(29, 155, 240, 0.03);
    transform: translateY(-2px);
}

.article-title {
    text-align: center;
    font-weight: 600;
    margin-bottom: 15px;
    font-size: 32px;
}

.article-title a {
    color: #1d9bf0;
    text-decoration: none;
}

.article-title a:hover {
    text-decoration: underline;
}

.item .content {
    text-align: left;
    margin: 10px 0;
    flex: 1;
    font-size: 18px;
}

.item .content img {
    display: block;
    margin: 0 auto;
    max-width: 100%;
}

h1 {
    font-size: 24px;
}

h2 {
    font-size: 18px;
}

.more-link {
    color: #1d9bf0;
    text-decoration: none;
    font-size: 16px;
}

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

.more-articles {
    text-align: center;
    margin: 30px auto 0 auto;
    padding: 20px 0;
    width: 100%;
    display: flex;
    justify-content: center;
}

.more-articles-link {
    color: #1d9bf0;
    text-decoration: none;
    font-size: 16px;
    font-weight: 600;
    display: inline-block;
    padding: 8px 15px;
    border: 2px solid #1d9bf0;
    border-radius: 12px;
    background-color: rgba(255, 255, 255, 0.95);
    transition: all 0.2s ease;
}

.more-articles-link:hover {
    background-color: rgba(29, 155, 240, 0.03);
    transform: translateY(-2px);
    text-decoration: none;
}

.prev-articles {
    text-align: center;
    margin-top: 20px;
    padding: 10px 0;
}

.prev-articles-link {
    color: #1d9bf0;
    text-decoration: none;
    font-size: 24px;
    font-weight: 500;
    display: inline-block;
    padding: 10px 20px;
    border: 1px solid #1d9bf0;
    border-radius: 16px;
    background-color: rgba(255, 255, 255, 0.9);
    transition: all 0.2s ease;
}

.prev-articles-link:hover {
    background-color: rgba(29, 155, 240, 0.03);
    transform: translateY(-1px);
    text-decoration: none;
}

.article-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 10px;
    width: 100%;
    position: relative;
}

.article-footer .more-link {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    color: #1d9bf0;
}

.article-footer .date {
    font-size: 16px;
    color: #1d9bf0;
    margin-left: auto;
    text-align: right;
}

.copyright {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
    font-size: 14px;
    color: #1d9bf0;
    font-weight: 400;
    text-align: center;
    margin: 20px auto 0;
    max-width: 800px;
}

.nickname {
    align-self: flex-end;
    margin-top: auto;
    font-size: 18px;
    color: #1d9bf0;
    width: 100%;
    text-align: right;
    padding-top: 10px;
}

.date {
    font-size: 16px;
    color: #1d9bf0;
}

.nav-arrow {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    font-size: 16px;
    color: #1d9bf0;
    background-color: rgba(255, 255, 255, 0.95);
    border: 2px solid #1d9bf0;
    border-radius: 8px;
    padding: 8px 12px;
    text-decoration: none;
    z-index: 1000;
    transition: all 0.2s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.nav-arrow-left {
    left: 15px;
}

.nav-arrow-right {
    right: 15px;
}

.nav-arrow:hover {
    color: #0a6db7;
    background-color: rgba(255, 255, 255, 1);
    transform: translateY(-52%);
}

/* 社交按钮样式 */
.social-buttons {
    margin-top: 20px;
    text-align: center;
}

.social-icon {
    display: inline-block;
    margin: 10px 15px;
    color: #1d9bf0;
    text-decoration: none;
    font-size: 16px;
    transition: all 0.2s ease;
}

.social-icon i {
    margin-right: 8px;
    font-size: 32px;
}

.social-icon:hover {
    color: #0a6db7;
    transform: translateY(-2px);
}

/* 扫码二维码样式 */
.qrcode-section {
    margin-top: 20px;
    text-align: center;
}

.qrcode-container {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

.qrcode-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.qrcode-img {
    width: 160px;
    height: 160px;
    border: 2px solid #1d9bf0;
    border-radius: 10px;
    margin-bottom: 10px;
    transition: transform 0.2s ease;
}

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

.qrcode-item p {
    margin: 0;
    font-size: 16px;
    color: #1d9bf0;
}

/* 移动端优化 */
@media (max-width: 768px) {
    body {
        padding: 10px;
        border-width: 4px;
    }

    /* 移动端导航栏也需要调整 - 方案3 */
    .nav {
        width: 100%;
        max-width: none;
        margin-left: auto;
        margin-right: auto;
        padding-left: 0;
        padding-right: 0;
    }

    .content-wrapper {
        width: 100%;
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        margin-right: 0;
        margin-bottom: 20px;
        max-height: 300px;
    }

    .main-content {
        width: 100%;
    }

    .container {
        width: 100%;
        padding: 20px;
    }

    .item {
        font-size: 20px;
        padding: 15px 18px;
    }

    .article-title {
        font-size: 24px;
    }

    .current-time {
        font-size: 20px;
    }

    .progress-text {
        font-size: 16px;
    }

    .progress-container {
        height: 50px;
    }

    .nav-arrow {
        font-size: 12px;
        padding: 4px 8px;
        border-radius: 6px;
        top: 70%;
        border-width: 1px;
        box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
    }

    .nav-arrow-left {
        left: 8px;
    }

    .nav-arrow-right {
        right: 8px;
    }

    .nav-arrow:hover {
        transform: translateY(-72%);
    }

    .item .content {
        font-size: 16px;
    }

    .more-articles-link {
        font-size: 20px;
        padding: 10px 20px;
    }

    .prev-articles-link {
        font-size: 18px;
        padding: 8px 16px;
    }

    .social-icon {
        font-size: 16px;
        margin: 8px 10px;
    }

    .social-icon i {
        font-size: 18px;
    }

    .qrcode-img {
        width: 100px;
        height: 100px;
    }

    .qrcode-container {
        gap: 20px;
    }
}

/* 超小屏幕优化 */
@media (max-width: 480px) {
    body {
        padding: 5px;
        border-width: 3px;
    }

    .nav-arrow {
        font-size: 10px;
        padding: 3px 6px;
        border-radius: 4px;
        top: 75%;
    }

    .nav-arrow-left {
        left: 5px;
    }

    .nav-arrow-right {
        right: 5px;
    }

    .nav-arrow:hover {
        transform: translateY(-77%);
    }

    .container {
        padding: 15px;
    }

    .item {
        font-size: 18px;
        padding: 12px 15px;
        margin-bottom: 15px;
    }

    .article-title {
        font-size: 20px;
    }

    .current-time {
        font-size: 18px;
    }

    .progress-text {
        font-size: 14px;
    }

    .progress-container {
        height: 40px;
    }

    .social-icon {
        font-size: 14px;
        margin: 6px 8px;
    }

    .social-icon i {
        font-size: 16px;
    }

    .qrcode-img {
        width: 80px;
        height: 80px;
    }

    .qrcode-container {
        gap: 15px;
    }
}

/* 确保侧边栏显示 */
.sidebar {
    display: block !important;
    visibility: visible !important;
}

.content-wrapper {
    display: flex !important;
}

/* 分页导航容器 */
.pagination-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 30px;
    gap: 20px;
}

.pagination-container .prev-articles,
.pagination-container .more-articles {
    margin: 0;
    padding: 0;
}

/* 移动端分页导航优化 */
@media (max-width: 768px) {
    .pagination-container {
        flex-direction: column;
        gap: 15px;
    }
}

/* 文章页面全宽样式 */
.full-width {
    width: 100% !important;
    margin: 0 auto;
}

.section-title {
    font-size: 32px;       /* 与 .article-title 一致 */
    font-weight: 600;      /* 与 .article-title 一致 */
    color: #1d9bf0;        /* 与 .article-title 一致 */
    margin-bottom: 15px;   /* 与 .article-title 的 margin-bottom 一致 */
    text-align: center;    /* 与 .article-title 一致 */
}