/* ==========================================================================
   BlueSheep — 极简清爽现代的蓝色 Typecho 主题
   为 sheep5.net 而作 · 无外部依赖 · 系统字体
   ========================================================================== */

/* ---------- 设计变量 ---------- */
:root {
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-soft: #eff6ff;
    --accent-soft-hover: #dbeafe;
    --accent-contrast: #ffffff;

    --bg: #ffffff;
    --bg-soft: #f8fafc;
    --bg-header: rgba(255, 255, 255, 0.86);
    --text: #1e293b;
    --text-2: #64748b;
    --border: #e2e8f0;
    --border-strong: #cbd5e1;

    --code-bg: #0f172a;
    --code-text: #e2e8f0;
    --inline-code-bg: #eff6ff;
    --inline-code-text: #1e40af;

    --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.12);

    --radius: 10px;
    --radius-sm: 6px;
    --container: 780px;

    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
    --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Code",
        Menlo, Consolas, monospace;
}

html[data-theme="dark"] {
    --accent: #60a5fa;
    --accent-hover: #93c5fd;
    --accent-soft: #1e2f4d;
    --accent-soft-hover: #274060;
    --accent-contrast: #0b1220;

    --bg: #0f172a;
    --bg-soft: #1e293b;
    --bg-header: rgba(15, 23, 42, 0.86);
    --text: #e2e8f0;
    --text-2: #94a3b8;
    --border: #2b3a52;
    --border-strong: #3d4f6b;

    --code-bg: #0b1220;
    --code-text: #e2e8f0;
    --inline-code-bg: #1e2f4d;
    --inline-code-text: #93c5fd;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
}

/* ---------- 基础 ---------- */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.8;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    transition: background-color 0.25s ease, color 0.25s ease;
}

img {
    max-width: 100%;
    height: auto;
    vertical-align: middle;
}

/* hidden 属性优先级保障（防止 display 覆盖） */
[hidden] {
    display: none !important;
}

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

a:hover {
    color: var(--accent-hover);
}

::selection {
    background: var(--accent);
    color: #fff;
}

.container {
    max-width: var(--container);
    margin-inline: auto;
    padding-inline: 20px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.skip-link {
    position: absolute;
    left: 8px;
    top: -48px;
    z-index: 200;
    padding: 8px 16px;
    background: var(--accent);
    color: #fff;
    border-radius: var(--radius-sm);
    transition: top 0.2s;
}

.skip-link:focus {
    top: 8px;
}

/* ---------- 顶部导航 ---------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg-header);
    -webkit-backdrop-filter: saturate(180%) blur(14px);
    backdrop-filter: saturate(180%) blur(14px);
    border-bottom: 1px solid var(--border);
}

.header-inner {
    display: flex;
    align-items: center;
    gap: 16px;
    height: 60px;
}

.site-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
    font-weight: 700;
    color: var(--text);
    font-size: 1.125rem;
    letter-spacing: -0.01em;
}

.site-brand:hover {
    color: var(--accent);
}

.site-logo {
    display: block;
}

.site-nav {
    margin-left: auto;
    min-width: 0;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 4px;
    margin: 0;
    padding: 0;
    list-style: none;
    white-space: nowrap;
}

.nav-list a {
    display: block;
    padding: 6px 12px;
    border-radius: 999px;
    color: var(--text-2);
    font-size: 0.9375rem;
    transition: color 0.15s, background-color 0.15s;
}

.nav-list a:hover {
    color: var(--accent);
    background: var(--accent-soft);
}

.nav-list a.active {
    color: var(--accent);
    font-weight: 600;
    background: var(--accent-soft);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 4px;
}

.icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    border: 0;
    border-radius: 50%;
    background: transparent;
    color: var(--text-2);
    cursor: pointer;
    transition: color 0.15s, background-color 0.15s;
}

.icon-btn:hover {
    color: var(--accent);
    background: var(--accent-soft);
}

.icon-btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.nav-toggle {
    display: none;
}

/* 主题切换按钮：浅色时显示月亮，深色时显示太阳 */
html[data-theme="light"] .icon-moon,
html:not([data-theme]) .icon-moon {
    display: block;
}

html[data-theme="light"] .icon-sun,
html:not([data-theme]) .icon-sun {
    display: none;
}

html[data-theme="dark"] .icon-moon {
    display: none;
}

html[data-theme="dark"] .icon-sun {
    display: block;
}

/* 搜索栏 */
.search-bar {
    border-top: 1px solid var(--border);
    padding-block: 10px;
}

.search-form {
    display: flex;
    gap: 10px;
}

.search-form input {
    flex: 1;
    min-width: 0;
    padding: 9px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
    color: var(--text);
    font-size: 0.9375rem;
    font-family: inherit;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.search-form input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.search-form button,
.error-search button {
    padding: 9px 20px;
    border: 0;
    border-radius: var(--radius);
    background: var(--accent);
    color: #fff;
    font-size: 0.9375rem;
    font-family: inherit;
    cursor: pointer;
    transition: background-color 0.15s;
}

.search-form button:hover,
.error-search button:hover {
    background: var(--accent-hover);
}

/* ---------- 主内容 ---------- */
.site-main {
    padding-block: 40px 64px;
    min-height: 60vh;
}

/* 文章列表 */
.post-list {
    display: flex;
    flex-direction: column;
}

.post-item {
    padding-block: 28px;
    border-bottom: 1px solid var(--border);
}

.post-item:first-child {
    padding-top: 8px;
}

.post-item:last-child {
    border-bottom: 0;
}

.post-item-title {
    margin: 0 0 8px;
    font-size: 1.25rem;
    line-height: 1.5;
    letter-spacing: -0.01em;
}

.post-item-title a {
    color: var(--text);
    transition: color 0.15s;
}

.post-item-title a:hover {
    color: var(--accent);
}

.post-item-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    margin-bottom: 10px;
    font-size: 0.8125rem;
    color: var(--text-2);
}

.post-item-meta a {
    color: var(--text-2);
}

.post-item-meta a:hover {
    color: var(--accent);
}

.meta-sep {
    color: var(--border-strong);
}

.post-item-excerpt {
    margin: 0;
    color: var(--text-2);
    font-size: 0.9375rem;
    line-height: 1.75;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* 分页 */
.page-navigator {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    margin: 36px 0 0;
    padding: 0;
    list-style: none;
}

.page-navigator li {
    display: inline-block;
}

.page-navigator a,
.page-navigator span {
    display: block;
    min-width: 38px;
    padding: 7px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-2);
    font-size: 0.875rem;
    text-align: center;
    transition: color 0.15s, border-color 0.15s, background-color 0.15s;
}

.page-navigator span {
    border-color: transparent;
}

.page-navigator a:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--accent-soft);
}

.page-navigator .current a {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--accent-soft);
    font-weight: 600;
}

/* ---------- 文章页 ---------- */
.post-header {
    margin-bottom: 28px;
}

.post-title {
    margin: 0 0 14px;
    font-size: clamp(1.5rem, 1.2rem + 1.6vw, 2rem);
    line-height: 1.4;
    letter-spacing: -0.015em;
}

.post-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px 16px;
    font-size: 0.8125rem;
    color: var(--text-2);
}

.post-meta-item {
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.post-meta-item svg {
    opacity: 0.75;
}

.post-meta-item a {
    color: var(--text-2);
}

.post-meta-item a:hover {
    color: var(--accent);
}

.post-updated {
    margin: 10px 0 0;
    font-size: 0.8125rem;
    color: var(--text-2);
}

/* 文章目录 */
.post-toc {
    margin-bottom: 28px;
    padding: 12px 18px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-soft);
    font-size: 0.9rem;
}

.post-toc summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--text);
    user-select: none;
}

.post-toc summary:hover {
    color: var(--accent);
}

.post-toc ul {
    margin: 8px 0 0;
    padding-left: 18px;
    list-style: none;
}

.post-toc li {
    margin: 3px 0;
}

.post-toc a {
    color: var(--text-2);
}

.post-toc a:hover {
    color: var(--accent);
}

.post-toc .toc-h3 {
    padding-left: 16px;
    font-size: 0.875rem;
}

/* ---------- 正文排版 ---------- */
.post-content {
    font-size: 1.0625rem;
    line-height: 1.85;
    word-break: break-word;
}

.post-content > :first-child {
    margin-top: 0;
}

.post-content > :last-child {
    margin-bottom: 0;
}

.post-content p {
    margin: 1.15em 0;
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4,
.post-content h5,
.post-content h6 {
    margin: 1.8em 0 0.8em;
    line-height: 1.45;
    letter-spacing: -0.01em;
    color: var(--text);
}

.post-content h2 {
    padding-bottom: 0.35em;
    border-bottom: 1px solid var(--border);
    font-size: 1.35em;
}

.post-content h3 {
    font-size: 1.15em;
}

.post-content h4 {
    font-size: 1.05em;
}

.post-content h2::before,
.post-content h3::before {
    content: "";
    display: inline-block;
    width: 4px;
    height: 0.85em;
    margin-right: 10px;
    border-radius: 2px;
    background: var(--accent);
    vertical-align: -0.05em;
}

.post-content a {
    text-decoration: underline;
    text-decoration-color: color-mix(in srgb, var(--accent) 35%, transparent);
    text-underline-offset: 3px;
}

.post-content a:hover {
    text-decoration-color: var(--accent);
}

.post-content ul,
.post-content ol {
    margin: 1.15em 0;
    padding-left: 1.6em;
}

.post-content li {
    margin: 0.35em 0;
}

.post-content blockquote {
    margin: 1.5em 0;
    padding: 12px 20px;
    border-left: 3px solid var(--accent);
    border-radius: 0 var(--radius) var(--radius) 0;
    background: var(--accent-soft);
    color: var(--text-2);
}

.post-content blockquote p {
    margin: 0.5em 0;
}

/* 深色模式下提亮引用文字，保证与 --accent-soft 背景的对比度 ≥ 4.5:1 */
html[data-theme="dark"] .post-content blockquote {
    color: #cbd5e1;
}

.post-content img {
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.post-content figure {
    margin: 1.5em auto;
    text-align: center;
}

.post-content figcaption {
    margin-top: 8px;
    font-size: 0.8125rem;
    color: var(--text-2);
}

/* 行内代码 */
.post-content code,
.post-content kbd {
    padding: 0.15em 0.45em;
    border-radius: var(--radius-sm);
    background: var(--inline-code-bg);
    color: var(--inline-code-text);
    font-family: var(--font-mono);
    font-size: 0.875em;
    word-break: break-all;
}

/* 代码块 */
.post-content pre,
.post-content pre code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    line-height: 1.7;
}

.post-content pre {
    position: relative;
    margin: 1.5em 0;
    padding: 16px 18px;
    overflow-x: auto;
    border-radius: var(--radius);
    background: var(--code-bg);
    color: var(--code-text);
    box-shadow: var(--shadow-sm);
}

.post-content pre code {
    display: block;
    padding: 0;
    background: transparent;
    color: inherit;
    word-break: normal;
    white-space: pre;
}

/* 代码复制按钮 */
.code-copy-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    padding: 4px 10px;
    border: 0;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.12);
    color: #cbd5e1;
    font-size: 0.75rem;
    font-family: var(--font-sans);
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.15s, background-color 0.15s;
}

.post-content pre:hover .code-copy-btn,
.code-copy-btn:focus-visible {
    opacity: 1;
}

.code-copy-btn:hover {
    background: rgba(255, 255, 255, 0.22);
    color: #fff;
}

/* 表格 */
.post-content table {
    width: 100%;
    margin: 1.5em 0;
    border-collapse: collapse;
    border-spacing: 0;
    font-size: 0.9375em;
    line-height: 1.7;
    display: block;
    overflow-x: auto;
}

.post-content th,
.post-content td {
    padding: 8px 12px;
    border: 1px solid var(--border);
}

.post-content th {
    background: var(--accent-soft);
    color: var(--text);
    font-weight: 600;
    white-space: nowrap;
}

.post-content tr:nth-child(2n) td {
    background: var(--bg-soft);
}

.post-content hr {
    margin: 2.5em auto;
    width: 60%;
    border: 0;
    border-top: 1px solid var(--border);
}

.post-content mark {
    padding: 0 0.25em;
    background: var(--accent-soft-hover);
    color: var(--text);
}

/* 文章标签 */
.post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 36px 0 0;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}

.post-tags .tag {
    display: inline-block;
    padding: 3px 12px;
    border-radius: 999px;
    background: var(--bg-soft);
    border: 1px solid var(--border);
    color: var(--text-2);
    font-size: 0.8125rem;
    transition: color 0.15s, border-color 0.15s, background-color 0.15s;
}

.post-tags .tag:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--accent-soft);
}

/* 上一篇 / 下一篇 */
.post-near {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin: 40px 0;
}

.post-near-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 14px 18px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-soft);
    min-width: 0;
}

.post-near-item a {
    color: var(--text);
    font-size: 0.9375rem;
    line-height: 1.5;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    transition: color 0.15s;
}

.post-near-item a:hover {
    color: var(--accent);
}

.post-near-label {
    font-size: 0.75rem;
    color: var(--text-2);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.post-near-next {
    text-align: right;
}

/* 相关文章 */
.related-posts {
    margin: 8px 0 40px;
}

.section-title {
    margin: 0 0 16px;
    font-size: 1.125rem;
    letter-spacing: -0.01em;
}

.related-list {
    margin: 0;
    padding: 0;
    list-style: none;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.related-list li + li {
    border-top: 1px solid var(--border);
}

.related-list a {
    display: block;
    padding: 12px 18px;
    color: var(--text);
    font-size: 0.9375rem;
    transition: background-color 0.15s, color 0.15s;
}

.related-list a:hover {
    background: var(--accent-soft);
    color: var(--accent);
}

/* ---------- 归档页 ---------- */
.archive-header {
    margin-bottom: 28px;
    padding-bottom: 18px;
    border-bottom: 1px solid var(--border);
}

.archive-title {
    margin: 0;
    font-size: clamp(1.25rem, 1.1rem + 1vw, 1.625rem);
    letter-spacing: -0.01em;
}

.archive-description {
    margin: 10px 0 0;
    color: var(--text-2);
    font-size: 0.9375rem;
}

.archive-page-intro {
    margin-bottom: 32px;
}

.archive-year {
    margin-bottom: 32px;
}

.archive-year-title {
    display: flex;
    align-items: baseline;
    gap: 10px;
    margin: 0 0 10px;
    font-size: 1.25rem;
    letter-spacing: -0.01em;
}

.archive-year-count {
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--text-2);
}

.archive-month-list {
    margin: 0;
    padding: 0 0 0 4px;
    list-style: none;
    border-left: 2px solid var(--border);
}

.archive-entry {
    display: flex;
    align-items: baseline;
    gap: 12px;
    padding: 6px 0 6px 16px;
    position: relative;
    font-size: 0.9375rem;
}

.archive-entry::before {
    content: "";
    position: absolute;
    left: -5px;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--bg);
    border: 2px solid var(--accent);
}

.archive-entry time {
    flex-shrink: 0;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--text-2);
}

.archive-entry a {
    color: var(--text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.archive-entry a:hover {
    color: var(--accent);
}

.archive-entry-comments {
    flex-shrink: 0;
    font-size: 0.75rem;
    color: var(--text-2);
}

/* ---------- 评论 ---------- */
.comments {
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--border);
}

.comments-title,
.respond-title {
    margin: 0 0 20px;
    font-size: 1.125rem;
    letter-spacing: -0.01em;
}

/* 评论列表（Typecho listComments 默认结构） */
ol.comment-list,
ol.comment-list ol.comment-list {
    margin: 0;
    padding: 0;
    list-style: none;
}

ol.comment-list ol.comment-list {
    margin-left: 40px;
    padding-left: 16px;
    border-left: 2px solid var(--border);
}

li.comment-body {
    margin-bottom: 20px;
}

.comment-body .comment-author {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 6px;
}

.comment-body .avatar {
    display: block;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--border);
}

.comment-body cite.fn {
    font-style: normal;
    font-weight: 600;
    font-size: 0.9375rem;
}

.comment-body cite.fn a {
    color: var(--text);
}

.comment-body cite.fn a:hover {
    color: var(--accent);
}

.comment-body .comment-meta {
    margin-bottom: 6px;
    font-size: 0.75rem;
    color: var(--text-2);
}

.comment-body .comment-meta a {
    color: var(--text-2);
}

.comment-body .comment-meta a:hover {
    color: var(--accent);
}

.comment-awaiting-moderation {
    font-style: normal;
    color: var(--accent);
    font-size: 0.75rem;
}

.comment-body .comment-content {
    font-size: 0.9375rem;
    line-height: 1.75;
    overflow-wrap: break-word;
}

.comment-body .comment-content p {
    margin: 0.5em 0;
}

.comment-body .comment-content img {
    max-height: 320px;
    border-radius: var(--radius-sm);
}

.comment-body .comment-reply {
    margin-top: 6px;
    font-size: 0.8125rem;
}

.comment-body .comment-reply a {
    color: var(--text-2);
}

.comment-body .comment-reply a:hover {
    color: var(--accent);
}

/* 评论表单 */
.respond {
    margin-top: 36px;
}

.comment-form p {
    margin: 0 0 14px;
}

.comment-form label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.875rem;
    color: var(--text-2);
}

.comment-form label.required::after {
    content: " *";
    color: var(--accent);
}

.comment-form .text,
.comment-form .textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
    color: var(--text);
    font-size: 0.9375rem;
    font-family: inherit;
    line-height: 1.6;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.comment-form .text:focus,
.comment-form .textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.comment-form .textarea {
    min-height: 140px;
    resize: vertical;
}

.comment-form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 14px;
}

.comment-form-grid .comment-form-url,
.comment-logged {
    grid-column: 1 / -1;
}

.comment-form .submit {
    padding: 10px 28px;
    border: 0;
    border-radius: var(--radius);
    background: var(--accent);
    color: #fff;
    font-size: 0.9375rem;
    font-family: inherit;
    cursor: pointer;
    transition: background-color 0.15s;
}

.comment-form .submit:hover {
    background: var(--accent-hover);
}

.comment-form-submit {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
}

.comment-notice {
    font-size: 0.75rem;
    color: var(--text-2);
}

.comments-closed {
    color: var(--text-2);
}

/* ---------- 空状态 / 404 ---------- */
.empty-state,
.error-page {
    padding: 60px 0;
    text-align: center;
}

.empty-state h2,
.error-title {
    margin: 0 0 10px;
    font-size: 1.375rem;
}

.empty-state p,
.error-text {
    margin: 0;
    color: var(--text-2);
}

.error-code {
    margin: 0;
    font-size: clamp(4rem, 10vw, 6.5rem);
    font-weight: 800;
    line-height: 1;
    letter-spacing: -0.03em;
    color: var(--accent);
    opacity: 0.9;
}

.error-search {
    display: flex;
    gap: 10px;
    max-width: 420px;
    margin: 28px auto 0;
}

.error-search .text {
    flex: 1;
    min-width: 0;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
    color: var(--text);
    font-family: inherit;
    font-size: 0.9375rem;
}

.error-search .text:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.error-actions {
    margin-top: 24px;
}

.btn {
    display: inline-block;
    padding: 10px 28px;
    border-radius: var(--radius);
    background: var(--accent);
    color: #fff;
    font-size: 0.9375rem;
    transition: background-color 0.15s;
}

.btn:hover {
    background: var(--accent-hover);
    color: #fff;
}

/* ---------- 页脚 ---------- */
.site-footer {
    padding: 36px 0 44px;
    border-top: 1px solid var(--border);
    background: var(--bg-soft);
    text-align: center;
    font-size: 0.8125rem;
    color: var(--text-2);
}

.site-footer p {
    margin: 6px 0;
}

.site-footer a {
    color: var(--text-2);
}

.site-footer a:hover {
    color: var(--accent);
}

.footer-social {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 14px;
}

.footer-social a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    color: var(--text-2);
    transition: color 0.15s, background-color 0.15s;
}

.footer-social a:hover {
    color: var(--accent);
    background: var(--accent-soft);
}

.footer-powered .theme-name {
    color: var(--accent);
    font-weight: 600;
}

/* ---------- 返回顶部 ---------- */
.back-to-top {
    position: fixed;
    right: 20px;
    bottom: 20px;
    z-index: 90;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--border);
    border-radius: 50%;
    background: var(--bg);
    color: var(--text-2);
    box-shadow: var(--shadow-md);
    cursor: pointer;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.2s, transform 0.2s, color 0.15s;
    pointer-events: none;
}

.back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.back-to-top:hover {
    color: var(--accent);
}

/* ---------- 灯箱 ---------- */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 300;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: rgba(15, 23, 42, 0.88);
    cursor: zoom-out;
}

.lightbox img {
    max-width: 100%;
    max-height: 100%;
    border-radius: var(--radius);
}

/* ---------- 响应式 ---------- */
@media (max-width: 767px) {
    .header-inner {
        height: 54px;
    }

    .nav-toggle {
        display: inline-flex;
    }

    .site-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        margin: 0;
        padding: 8px 20px 16px;
        background: var(--bg);
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-md);
    }

    .site-nav.open {
        display: block;
    }

    .nav-list {
        flex-direction: column;
        align-items: stretch;
        gap: 2px;
        white-space: normal;
    }

    .nav-list a {
        padding: 10px 14px;
        border-radius: var(--radius-sm);
    }

    .site-main {
        padding-block: 28px 48px;
    }

    .post-content {
        font-size: 1rem;
    }

    .post-near {
        grid-template-columns: 1fr;
    }

    .post-near-next {
        text-align: left;
    }

    .comment-form-grid {
        grid-template-columns: 1fr;
    }

    ol.comment-list ol.comment-list {
        margin-left: 16px;
        padding-left: 10px;
    }
}

/* ---------- 动画偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
    }
}