/* --- Global Settings & Variables --- */
:root {
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-serif: "Georgia", "Times New Roman", serif;
    --font-mono: "Courier New", monospace;

    --color-text: #333;
    --color-background: #fdfdfd;
    --color-primary: #007bff;
    --color-border: #eee;
    --color-meta: #777;
    --color-code-bg: #f5f5f5;
}

body {
    font-family: var(--font-serif);
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-background);
    margin: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    font-size: 16px;
}

/* --- Layout --- */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.post-container {
    display: flex;
    max-width: 1100px;
    align-items: flex-start;
    gap: 2rem;
}

.post-full {
    flex: 1; /* 文章主体占据剩余空间 */
    min-width: 0; /* 防止flex项目溢出 */
}

.main-content {
    flex: 1;
}

/* --- Header & Footer --- */
.site-header {
    padding: 1.5rem 1rem;
    border-bottom: 1px solid var(--color-border);
    /* margin-bottom: 2rem; */
}

.nav-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-title {
    font-family: var(--font-sans);
    font-size: 1.5rem;
    font-weight: bold;
    text-decoration: none;
    color: var(--color-text);
}

.site-nav a {
    font-family: var(--font-sans);
    text-decoration: none;
    color: var(--color-text);
    margin-left: 1.5rem;
    transition: color 0.2s ease;
}

.site-nav a:hover {
    color: var(--color-primary);
}

.site-footer {
    text-align: center;
    padding: 2rem 1rem;
    margin-top: 3rem;
    border-top: 1px solid var(--color-border);
    color: var(--color-meta);
    font-family: var(--font-sans);
    font-size: 0.9rem;
}

/* --- Typography & Content --- */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-sans);
    color: var(--color-text);
    line-height: 1.3;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }

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

a:hover {
    text-decoration: underline;
}

p {
    margin-bottom: 1.5rem;
}

ul, ol {
    padding-left: 1.5rem;
    margin-bottom: 1.5rem;
}

blockquote {
    border-left: 3px solid var(--color-primary);
    padding-left: 1.5rem;
    margin: 2rem 0;
    font-style: italic;
    color: var(--color-meta);
}

pre {
    background-color: var(--color-code-bg);
    padding: 1rem;
    border-radius: 4px;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.4;
}
code {
    font-family: var(--font-mono);
    background-color: var(--color-code-bg);
    padding: 0.2em 0.4em;
    border-radius: 3px;
    font-size: 90%;
}
pre code {
    padding: 0;
    background: none;
    border-radius: 0;
}

img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
}

/* --- Post List --- */
.post-item {
    margin-bottom: 3rem;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 3rem;
}
.post-item:last-child {
    border-bottom: none;
}
.post-item-title {
    margin: 0 0 0.5rem 0;
}
.post-item-title a {
    color: var(--color-text);
    text-decoration: none;
}
.post-item-title a:hover {
    color: var(--color-primary);
}
.post-meta {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    color: var(--color-meta);
    margin-bottom: 1rem;
}
.post-meta a {
    color: var(--color-meta);
}
.post-meta a:hover {
    color: var(--color-primary);
}

/* --- Full Post / Page --- */
.post-full-header, .page-full-header {
    text-align: center;
    margin-bottom: 3rem;
}
.post-full-title, .page-full-title {
    margin: 0;
}
.post-content {
    margin-top: 2rem;
    overflow-wrap: break-word;
    word-wrap: break-word;
}

.post-content img {
    cursor: zoom-in;
}

/* --- Tags & Categories --- */
.tag, .category-link {
    display: inline-block;
    background-color: #f0f0f0;
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-family: var(--font-sans);
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
    color: var(--color-meta);
    text-decoration: none;
    transition: all 0.2s ease;
}
.tag:hover, .category-link:hover {
    background-color: var(--color-primary);
    color: #fff;
    text-decoration: none;
}

/* --- Archive & List Pages --- */
.archive-list, .tag-list, .category-list {
    list-style: none;
    padding: 0;
}
.archive-list li, .tag-list li, .category-list li {
    margin-bottom: 1rem;
    font-family: var(--font-sans);
    font-size: 1.1rem;
}
.archive-list time {
    color: var(--color-meta);
    margin-right: 1rem;
    display: inline-block;
    width: 100px;
}
.archive-year {
    margin: 2.5rem 0 1.5rem;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 0.5rem;
}

/* --- Error Page --- */
.error-container {
    text-align: center;
    padding: 4rem 1rem;
}
.error-container h1 {
    font-size: 6rem;
    margin: 0;
    color: #ccc;
}
.error-container p {
    font-size: 1.5rem;
    font-family: var(--font-sans);
}
.error-container a {
    font-size: 1rem;
}

/* --- Responsive --- */
@media (max-width: 768px) {
    body { font-size: 15px; }
    h1 { font-size: 2rem; }
    h2 { font-size: 1.7rem; }

    .nav-container {
        flex-direction: column;
    }
    .site-title {
        margin-bottom: 1rem;
    }
    .site-nav a {
        margin: 0 0.75rem;
    }
}

/* --- Hitokoto (One-liner) --- */
.hitokoto-wrapper {
    text-align: center;
    margin: 1rem auto 4rem;
    padding: 1.5rem 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.hitokoto-text {
    font-size: 1.2rem;
    font-style: italic;
    color: var(--color-text);
    margin: 0;
}

.hitokoto-source {
    font-size: 0.9rem;
    color: var(--color-meta);
    font-family: var(--font-sans);
    margin: 0.5rem 0 0 0;
}

/* --- Social Links --- */
.social-links {
    text-align: center;
    margin-bottom: 2rem;
}

.social-links a {
    display: inline-block;
    margin: 0 0.8rem;
    color: var(--color-meta);
    font-size: 1.6rem;
    text-decoration: none;
    transition: color 0.2s ease-in-out;
}

.social-links a:hover {
    color: var(--color-primary); /* 鼠标悬停时变为主题色 */
}

/* --- Pagination (Simple Style) --- */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center; /* 垂直居中对齐箭头和文字 */
    margin-top: 4rem;
    font-family: var(--font-sans);
}

.page-indicator {
    margin: 0 1.5rem; /* 与箭头之间的间距 */
    font-size: 1.1rem;
    color: var(--color-text);
    font-weight: bold;
    letter-spacing: 0.1em; /* 增加数字和斜线的间距 */
}

.page-nav-arrow {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;  /* 定义宽度 */
    height: 40px; /* 定义高度 */
    border: 1px solid var(--color-border);
    border-radius: 50%; /* 圆形按钮 */
    color: var(--color-meta);
    text-decoration: none;
    transition: all 0.2s ease-in-out;
}

a.page-nav-arrow:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
    background-color: #fdfdfd;
}

/* 禁用状态下的箭头样式 */
.page-nav-arrow.disabled {
    color: var(--color-border);
    background-color: #f8f9fa;
    cursor: default;
}

a.page-nav-arrow.disabled:hover {
    color: var(--color-border);
    border-color: var(--color-border);
}

/* --- Pagination --- */
.pagination-list {
    display: flex;
    align-items: center; /* 垂直居中对齐 */
    list-style: none;
    padding: 0;
    margin: 0;
}

.pagination-item {
    margin: 0 0.25rem;
}

.pagination-item .page-link {
    display: flex; /* 使用 flex 布局让图标和文字对齐 */
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    color: var(--color-meta);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    text-decoration: none;
    transition: all 0.2s ease-in-out;
}

/* 上一页/下一页链接内的图标样式 */
.pagination-item .page-link i {
    font-size: 0.8em; /* 让图标比文字稍小一点 */
}
.pagination-item .page-link .page-link-text {
    margin: 0 0.4rem; /* 图标和文字之间的间距 */
}


.pagination-item a.page-link:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.pagination-item.current .page-link {
    background-color: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
    cursor: default;
}

.pagination-item.disabled .page-link {
    color: #ccc;
    cursor: default;
}

.pagination-item.disabled .page-link:hover {
    color: #ccc;
    border-color: var(--color-border);
}

/* ====================================================== */
/* 移动端适配样式         */
/* ====================================================== */
@media (max-width: 768px) {
    /* 在移动端隐藏 "上一页" 和 "下一页" 的文字 */
    .pagination .page-link-text {
        display: none;
    }

    /* 在移动端隐藏带 .hide-on-mobile class 的元素 */
    .pagination-item.hide-on-mobile {
        display: none;
    }

    /* 为只有图标的按钮调整内边距，使其更像一个方形 */
    .pagination-item .page-link {
        padding: 0.5rem 0.8rem;
    }
}

/* --- Empty State --- */
.empty-state-container {
    text-align: center;
    padding: 5rem 2rem;
    margin-top: 2rem;
    border: 2px dashed var(--color-border);
    border-radius: 8px;
    color: var(--color-meta);
}

.empty-state-icon {
    font-size: 3.5rem;
    color: var(--color-border);
    margin-bottom: 1.5rem;
}

.empty-state-container h2 {
    font-family: var(--font-sans);
    color: var(--color-text);
    margin: 0 0 1rem 0;
}

.empty-state-container p {
    font-size: 1.1rem;
    max-width: 400px;
    margin: 0 auto 2rem auto;
}

.btn-write-post {
    display: inline-block;
    background-color: var(--color-primary);
    color: #fff;
    padding: 0.8rem 1.8rem;
    border-radius: 5px;
    text-decoration: none;
    font-family: var(--font-sans);
    font-weight: bold;
    transition: all 0.2s ease-in-out;
}

.btn-write-post:hover {
    background-color: var(--color-text);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

/* --- Table of Contents (TOC) --- */
.toc-container {
    flex: 0 0 240px; /* 固定宽度，不伸缩 */
    order: 2; /* 确保它在右侧 */
}

.toc-sticky {
    position: sticky;
    top: 2rem; /* 距离视口顶部的距离 */
}

.toc-container h4 {
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: bold;
    margin: 0 0 1rem 0;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 0.5rem;
}

.toc-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.toc-nav li {
    margin-bottom: 0.5rem;
}

.toc-nav a {
    color: var(--color-meta);
    text-decoration: none;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    display: block;
    transition: all 0.2s ease;
}

.toc-nav a:hover {
    color: var(--color-primary);
    transform: translateX(4px);
}

/* 滚动监听高亮样式 */
.toc-nav a.active {
    color: var(--color-primary);
    font-weight: bold;
    transform: translateX(4px);
}

/* 目录层级缩进 */
.toc-level-h3 {
    padding-left: 1rem;
}

/* --- Responsive for Post with TOC --- */
@media (max-width: 1024px) {
    /* 在平板和手机上隐藏目录 */
    .toc-container {
        display: none;
    }

    /* 让文章内容区域恢复正常宽度 */
    .post-container {
        max-width: 800px;
        padding: 2rem 1rem;
    }
}

/* --- Comments Section --- */
.post-comments {
    margin-top: 5rem; /* 与文章正文拉开距离 */
    padding-top: 3rem; /* 顶部留白 */
    border-top: 1px solid var(--color-border); /* 一条分割线 */
}

.comments-title {
    text-align: center;
    font-family: var(--font-sans);
    margin-bottom: 3rem;
    color: var(--color-text);
}

.comment-thread-container {
}

.comment-loading-notice {
    text-align: center;
    color: var(--color-meta);
    font-style: italic;
    padding: 2rem 0;
}