/* ========================================================================
   茶露 · teadews — 极简东方美学 Typecho 主题
   清冽 · 微凉 · 润泽 · 克制 · 疏离 · 纸墨感
   ======================================================================== */

/* --------------------------------------------------------------------
   1. 设计变量
   -------------------------------------------------------------------- */
:root,
[data-theme="light"] {
  color-scheme: light;

  --bg-primary: #F8F9F7;
  --bg-secondary: #F0F2EF;
  --text-primary: #262A28;
  --text-secondary: #6C746F;
  --accent-color: #456354;
  --border-color: rgba(70, 85, 78, 0.1);

  /* 最浅一档辅助文字：深色模式下比 --text-secondary 提亮半阶，保证低亮度屏可读 */
  --text-muted: #6C746F;
  --font-numeric: Georgia, "Times New Roman", "Songti SC", serif;

  /* 水墨晕染：墨落宣纸 */
  --ink-strong: rgba(70, 85, 78, 0.13);
  --ink-mid: rgba(70, 85, 78, 0.07);
  --ink-soft: rgba(70, 85, 78, 0.04);

  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", Menlo, Monaco, Consolas, monospace;

  --content-width: 700px;
  --frame-width: 960px;
  --radius: 2px;
  --ease: all 0.25s ease;
}

[data-theme="dark"] {
  color-scheme: dark;

  --bg-primary: #141715;
  --bg-secondary: #1C201E;
  --text-primary: #D3DAD5;
  --text-secondary: #7F8A83;
  --accent-color: #7FA692;
  --border-color: rgba(211, 218, 213, 0.12);

  /* 夜林下的冷露色：辅助文字提亮半阶 */
  --text-muted: #9AA59E;

  /* 水墨晕染：夜林冷露 */
  --ink-strong: rgba(127, 166, 146, 0.15);
  --ink-mid: rgba(127, 166, 146, 0.08);
  --ink-soft: rgba(127, 166, 146, 0.04);
}

/* --------------------------------------------------------------------
   2. 基础重置
   -------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color 0.35s ease, color 0.35s ease;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* 主题切换瞬间完成：切换时挂上 theme-switching 类抑制全部过渡，
   避免大号衬线标题在明暗渐变的低对比区间发灰闪烁（一帧后由 JS 移除） */
html.theme-switching,
html.theme-switching *,
html.theme-switching *::before,
html.theme-switching *::after {
  transition: none !important;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--ease);
}

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

img,
video {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
}

::selection {
  background: color-mix(in srgb, var(--accent-color) 22%, transparent);
}

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

/* --------------------------------------------------------------------
   3. 版式骨架：单栏居中流式
   -------------------------------------------------------------------- */
.site-header > .frame,
.site-footer > .frame {
  max-width: var(--frame-width);
  margin: 0 auto;
  padding: 0 24px;
}

.site-main {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 24px;
  min-height: 62vh;
}

/* --------------------------------------------------------------------
   4. 页眉：品牌 + 导航 + 主题切换
   -------------------------------------------------------------------- */
.site-header {
  position: relative;
  padding: 44px 0 36px;
}

.header-inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-title {
  font-family: var(--font-serif);
  font-size: 1.375rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  line-height: 1.4;
}

.brand-title .brand-domain {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: 0.03em;
  margin-left: 8px;
  vertical-align: 2px;
}

.brand-tagline {
  font-size: 0.8rem;
  color: var(--text-secondary);
  letter-spacing: 0.12em;
}

.header-side {
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-nav {
  display: flex;
  align-items: center;
}

.site-nav a,
.site-nav .nav-search-btn {
  font-family: var(--font-serif);
  font-size: 0.875rem;
  color: var(--text-secondary);
  letter-spacing: 0.08em;
  padding: 4px 0;
  transition: var(--ease);
}

.site-nav a {
  text-decoration: none;
  text-underline-offset: 6px;
  text-decoration-thickness: 1px;
}

.site-nav a:hover,
.site-nav a.current,
.site-nav .nav-search-btn:hover {
  color: var(--accent-color);
}

.site-nav a:hover,
.site-nav a.current {
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent-color) 60%, transparent);
}

/* 「寻字」文字触发器：与导航完全同排版，去按钮默认样式 */
.site-nav .nav-search-btn {
  background: none;
  border: none;
  padding: 4px 0;
  outline: none;
  cursor: pointer;
}

.site-nav .nav-search-btn:focus-visible {
  color: var(--accent-color);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent-color) 60%, transparent);
}

/* 中位点：CSS 自动渲染，末项（明暗切换图标）后无点 */
.site-nav a:not(:last-child)::after,
.site-nav .nav-search-btn::after {
  content: "·";
  display: inline-block;
  margin: 0 0.7em;
  opacity: 0.35;
  font-family: inherit;
  vertical-align: middle;
  transform: translateY(-1px);
}

/* 图标按钮：搜索 / 明暗切换 / 移动端菜单 */
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  color: var(--text-secondary);
  transition: var(--ease);
}

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

.icon-btn svg {
  width: 17px;
  height: 17px;
}

.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }

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

/* 移动端菜单按钮仅小屏出现 */
.nav-toggle { display: none; }

/* 搜索：首页独有 · 水墨晕染入字，「寻」如闲章 */
.search-bar {
  display: none;
  padding: 40px 0 4px;
}

.site-header.search-open .search-bar {
  display: block;
  animation: search-fade 0.35s ease;
}

@keyframes search-fade {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.search-form {
  display: flex;
  align-items: center;
  gap: 20px;
  max-width: 560px;
  margin: 0 auto;
  padding: 0 8px;
}

/* 墨韵：多层径向渐变晕开，边缘以模糊融入纸面 */
.search-ink {
  position: relative;
  flex: 1;
  display: flex;
  align-items: center;
}

.search-ink::before {
  content: "";
  position: absolute;
  inset: -20px -34px;
  background:
    radial-gradient(55% 85% at 26% 50%, var(--ink-strong) 0%, transparent 72%),
    radial-gradient(42% 70% at 60% 40%, var(--ink-mid) 0%, transparent 75%),
    radial-gradient(30% 55% at 84% 62%, var(--ink-soft) 0%, transparent 78%);
  border-radius: 46% 54% 50% 50% / 58% 46% 54% 42%;
  filter: blur(14px);
  opacity: 0.8;
  transition: opacity 0.35s ease;
  pointer-events: none;
}

.search-ink:focus-within::before {
  opacity: 1;
}

.search-input {
  position: relative;
  width: 100%;
  font-family: var(--font-serif);
  font-size: 1.02rem;
  font-weight: 400;
  letter-spacing: 0.14em;
  color: var(--text-primary);
  background: transparent;
  border: none;
  padding: 12px 8px;
}

.search-input:focus {
  outline: none;
}

.search-input::placeholder {
  color: var(--text-secondary);
  opacity: 0.75;
}

/* 「寻」字闲章：手刻印框，底缀一抹云纹 */
.search-submit {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  min-width: 54px;
  padding: 9px 12px 7px;
  color: var(--accent-color);
  font-family: var(--font-serif);
  font-size: 1.22rem;
  line-height: 1;
  border: 1px solid color-mix(in srgb, var(--accent-color) 42%, transparent);
  border-radius: 4px 6px 5px 7px / 6px 4px 7px 5px;
  transition: var(--ease);
}

.search-char {
  display: block;
}

.search-cloud {
  display: block;
  width: 16px;
  opacity: 0.75;
}

.search-submit:hover {
  border-color: var(--accent-color);
  background: color-mix(in srgb, var(--accent-color) 8%, transparent);
}

/* --------------------------------------------------------------------
   5. 首页 / 归档：时间线
   -------------------------------------------------------------------- */
.archive-head {
  margin: 8px 0 40px;
}

.archive-head .archive-keyword {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: 0.04em;
}

.archive-head .archive-label {
  font-size: 0.78rem;
  color: var(--text-secondary);
  letter-spacing: 0.2em;
}

.timeline-year {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.14em;
  margin: 56px 0 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
}

.timeline-year:first-child { margin-top: 8px; }

.post-item {
  margin-bottom: 34px;
}

.post-item-link {
  display: flex;
  align-items: baseline;
  gap: 20px;
}

.post-item-date {
  flex: 0 0 6em;
  font-family: var(--font-numeric);
  font-variant-numeric: tabular-nums;
  font-size: 0.85rem;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

.post-item-title {
  font-family: var(--font-serif);
  font-size: 1.06rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  line-height: 1.6;
  /* 下划线自左向右展开 */
  background: linear-gradient(currentColor, currentColor) no-repeat left 100% / 0% 1px;
  padding-bottom: 2px;
  transition: background-size 0.3s ease, color 0.25s ease;
}

.post-item-link:hover .post-item-title {
  color: var(--accent-color);
  background-size: 100% 1px;
}

.post-item-excerpt {
  margin: 6px 0 0 calc(6em + 20px);
  font-size: 0.84rem;
  color: var(--text-muted);
  line-height: 1.8;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.post-item-empty {
  padding: 64px 0;
  text-align: center;
  color: var(--text-secondary);
  font-family: var(--font-serif);
  letter-spacing: 0.1em;
}

/* 分页 */
.page-navigator {
  list-style: none;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin: 64px 0 24px;
  font-family: var(--font-numeric);
  font-variant-numeric: tabular-nums;
  font-size: 0.9rem;
}

.page-navigator li a,
.page-navigator li span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  min-height: 38px;
  padding: 0 12px;
  border-radius: 2px;
  color: var(--text-muted);
  transition: var(--ease);
}

.page-navigator li a:hover {
  color: var(--accent-color);
  text-decoration: underline;
  text-underline-offset: 6px;
  text-decoration-thickness: 1px;
}

.page-navigator .current {
  color: var(--accent-color);
  text-decoration: underline;
  text-underline-offset: 6px;
  text-decoration-thickness: 1px;
}

/* --------------------------------------------------------------------
   6. 文章页
   -------------------------------------------------------------------- */
.post-header {
  margin: 16px 0 48px;
}

.post-title {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 4.5vw, 2.1rem);
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1.55;
  margin: 0;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 18px;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

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

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

.post-meta .dot {
  opacity: 0.5;
}

.post-meta time {
  font-family: var(--font-numeric);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.03em;
}

/* 正文排版 */
.post-content {
  font-size: 1rem;
  line-height: 1.85;
}

.post-content p {
  margin: 0 0 1.6em;
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4,
.post-content h5,
.post-content h6 {
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1.5;
  margin: 2.2em 0 0.8em;
}

.post-content h2 { font-size: 1.38em; }
.post-content h3 { font-size: 1.18em; }
.post-content h4,
.post-content h5,
.post-content h6 { font-size: 1.04em; }

/* 引用块：单条 2px 茶青竖线，楷体落墨，不用伪斜体 */
.post-content blockquote {
  margin: 1.8em 0;
  padding: 4px 20px;
  border-left: 2px solid var(--accent-color);
  color: var(--text-secondary);
  font-family: "Kaiti SC", "STKaiti", KaiTi, "楷体", var(--font-serif);
  font-size: 0.95em;
}

/* 楷体笔画纤细，夜林底色下补亮半阶、字号回补一档，避免笔锋发虚 */
[data-theme="dark"] .post-content blockquote {
  color: var(--text-muted);
  font-size: 1em;
}

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

/* 内联代码 */
.post-content code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  padding: 2px 6px;
  border-radius: var(--radius);
  background: var(--bg-secondary);
}

/* 代码块：恒常暗底，克制圆角，平滑横向滚动 */
.post-content pre {
  margin: 1.8em 0;
  padding: 18px 20px;
  background: #171B19;
  border: 1px solid rgba(211, 218, 213, 0.08);
  border-radius: 4px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.post-content pre code {
  display: block;
  padding: 0;
  background: none;
  color: #C7D1CA;
  font-size: 0.84rem;
  line-height: 1.75;
}

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

.post-content li {
  margin-bottom: 0.4em;
}

/* 图片：极小圆角，居中，注脚极小灰字 */
.post-content img {
  display: block;
  margin: 2em auto;
  box-shadow: 0 0 0 1px var(--border-color);
}

.post-content figure {
  margin: 2em 0;
}

.post-content figcaption {
  text-align: center;
  font-size: 0.76rem;
  color: var(--text-secondary);
  margin-top: 8px;
}

/* 表格：三线表 */
.post-content table {
  width: 100%;
  margin: 2em 0;
  border-collapse: collapse;
  font-size: 0.9rem;
  border-top: 1px solid var(--text-secondary);
  border-bottom: 1px solid var(--text-secondary);
}

.post-content thead {
  border-bottom: 1px solid var(--border-color);
}

.post-content th,
.post-content td {
  padding: 10px 8px;
  text-align: left;
  border: none;
}

.post-content th {
  font-weight: 600;
  letter-spacing: 0.04em;
}

.post-content tbody tr {
  transition: background-color 0.2s ease;
}

.post-content tbody tr:hover {
  background: color-mix(in srgb, var(--accent-color) 4%, transparent);
}

/* 分隔线 */
.post-content hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 3em auto;
  width: 30%;
}

/* 链接：下划线淡入 */
.post-content a,
.comment-content a,
.page-content a {
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
  transition: var(--ease);
}

.post-content a:hover,
.comment-content a:hover,
.page-content a:hover {
  color: var(--accent-color);
  border-bottom-color: var(--accent-color);
}

/* 阅读剩余部分 */
.post-content .more a {
  color: var(--accent-color);
  border-bottom: none;
  letter-spacing: 0.08em;
}

/* 文章脚注：随文脚注，不设分割线（唯一的线留给上下篇） */
.post-footer {
  margin-top: 44px;
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 2;
}

.post-license .punct,
.site-footer .punct {
  margin: 0 0.45em;
  opacity: 0.55;
}

.post-tags a {
  display: inline-block;
  margin-right: 10px;
  color: var(--text-secondary);
}

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

.post-license {
  opacity: 0.85;
}

/* 上一篇 / 下一篇 */
.post-near {
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  margin: 48px 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--border-color);
  font-size: 0.88rem;
}

.post-near li {
  flex: 1;
  min-width: 0;
}

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

.post-near .near-label {
  display: block;
  font-size: 0.76rem;
  color: var(--text-muted);
  letter-spacing: 0.2em;
  margin-bottom: 4px;
}

.post-near a {
  font-family: var(--font-serif);
  letter-spacing: 0.02em;
}

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

.post-near .near-empty {
  color: var(--text-muted);
  opacity: 0.7;
  pointer-events: none;
  cursor: default;
}

/* --------------------------------------------------------------------
   7. 独立页面
   -------------------------------------------------------------------- */
.page-title {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 4vw, 1.9rem);
  font-weight: 600;
  letter-spacing: 0.04em;
  margin: 16px 0 44px;
}

/* --------------------------------------------------------------------
   8. 评论区：扁平去框线
   -------------------------------------------------------------------- */
.comments {
  margin-top: 40px;
}

.comments-title {
  font-family: var(--font-serif);
  font-size: 1.02rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  margin-bottom: 28px;
}

.comment-list,
.comment-list ol {
  list-style: none;
}

.comment-list > li {
  padding: 20px 0;
  border-top: 1px solid var(--border-color);
}

.comment-children {
  margin-left: 28px;
}

.comment-children > ol > li {
  border-top: 1px solid var(--border-color);
}

.comment-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 0.84rem;
}

.comment-author {
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: 0.04em;
}

.comment-by-author .comment-author::after {
  content: "茶主";
  font-size: 0.68rem;
  font-weight: 400;
  color: var(--accent-color);
  border: 1px solid color-mix(in srgb, var(--accent-color) 40%, transparent);
  border-radius: var(--radius);
  padding: 0 5px;
  margin-left: 8px;
  vertical-align: 1px;
  letter-spacing: 0.1em;
}

.comment-time {
  font-family: var(--font-numeric);
  font-variant-numeric: tabular-nums;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.comment-time:hover { color: var(--accent-color); }

.comment-pending {
  font-style: normal;
  font-size: 0.76rem;
  color: var(--accent-color);
  opacity: 0.8;
}

.comment-content {
  margin-top: 8px;
  font-size: 0.92rem;
  line-height: 1.8;
  overflow-wrap: break-word;
}

.comment-reply {
  margin-top: 6px;
  font-size: 0.78rem;
}

.comment-reply a {
  color: var(--text-secondary);
  letter-spacing: 0.1em;
}

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

.comments-none {
  color: var(--text-muted);
  font-size: 0.88rem;
  letter-spacing: 0.08em;
  padding: 12px 0 0;
  margin-bottom: 2.5rem;
}

/* 评论表单：信笺手札 */
.respond {
  margin-top: 40px;
}

.respond .response-title {
  font-family: var(--font-serif);
  font-size: 1.06rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--text-primary);
  padding-bottom: 12px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}

.respond .cancel-comment-reply {
  font-size: 0.8rem;
  margin-bottom: 12px;
}

.respond .cancel-comment-reply a {
  color: var(--accent-color);
  border-bottom: 1px solid color-mix(in srgb, var(--accent-color) 35%, transparent);
  padding-bottom: 1px;
}

.respond .respond-logged {
  font-size: 0.84rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.respond .respond-logged a {
  color: var(--accent-color);
}

/* 元数据双栏网格：仅称呼与邮箱 */
.comment-meta-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 20px;
}

.comment-meta-grid .text-input {
  width: 100%;
  height: 36px;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border-color);
  border-radius: 0;
  color: var(--text-primary);
  font-size: 0.8125rem;
  font-family: inherit;
  padding: 0 4px;
  outline: none;
  transition: border-color 0.25s ease;
}

.comment-meta-grid .text-input:focus {
  border-bottom-color: var(--accent-color);
}

.comment-meta-grid .text-input::placeholder,
.comment-textarea-wrap .textarea-input::placeholder {
  color: var(--text-secondary);
  opacity: 0.7;
  font-family: var(--font-serif);
}

/* 信笺手札文本域 */
.comment-textarea-wrap {
  position: relative;
  width: 100%;
}

.comment-textarea-wrap .textarea-input {
  display: block;
  width: 100%;
  box-sizing: border-box;
  padding: 16px 18px 46px;
  background: color-mix(in srgb, var(--accent-color) 3%, transparent);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-primary);
  font-size: 0.875rem;
  line-height: 1.8;
  font-family: inherit;
  resize: none;
  outline: none;
  transition: border-color 0.25s ease, background-color 0.25s ease;
}

.comment-textarea-wrap .textarea-input:focus {
  border-color: var(--accent-color);
  background: color-mix(in srgb, var(--accent-color) 5%, transparent);
}

.comment-textarea-wrap .textarea-input::placeholder {
  opacity: 0.6;
}

/* 右下角落款印章按钮 */
.comment-submit-wrap {
  position: absolute;
  right: 14px;
  bottom: 14px;
  z-index: 2;
}

.comment-submit-wrap .submit-btn {
  background: transparent;
  border: 1px solid var(--accent-color);
  color: var(--accent-color);
  font-family: var(--font-serif);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  padding: 5px 14px 5px 16px;
  border-radius: 2px;
  cursor: pointer;
  opacity: 0.85;
  transition: var(--ease);
}

.comment-submit-wrap .submit-btn:hover {
  background: var(--accent-color);
  color: var(--bg-primary);
  opacity: 1;
}

/* 视觉隐藏的无障碍标签 */
.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;
}

/* --------------------------------------------------------------------
   9. 页脚
   -------------------------------------------------------------------- */
.site-footer {
  margin-top: 96px;
  padding: 32px 0 48px;
  border-top: 1px solid var(--border-color);
}

.site-footer .frame {
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 2.1;
  letter-spacing: 0.06em;
}

.site-footer .footer-mark {
  display: block;
  width: 13px;
  margin: 0 auto 10px;
  fill: var(--accent-color);
  opacity: 0.45;
}

.site-footer a {
  color: var(--text-secondary);
  border-bottom: 1px solid transparent;
}

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

.site-footer .beian {
  opacity: 0.65;
}

/* --------------------------------------------------------------------
   10. 404
   -------------------------------------------------------------------- */
.error-page {
  text-align: center;
  padding: 96px 0 64px;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 4.2rem;
  font-weight: 300;
  color: var(--text-secondary);
  letter-spacing: 0.1em;
}

.error-word {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  letter-spacing: 0.24em;
  margin: 20px 0 36px;
}

.error-page a {
  font-size: 0.86rem;
  color: var(--accent-color);
  letter-spacing: 0.14em;
  border-bottom: 1px solid color-mix(in srgb, var(--accent-color) 40%, transparent);
}

/* --------------------------------------------------------------------
   11. 响应式
   -------------------------------------------------------------------- */
@media (max-width: 768px) {
  .site-header {
    padding: 28px 0 24px;
  }

  .header-inner {
    align-items: center;
  }

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

  .site-nav {
    display: none;
    position: absolute;
    top: 76px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 16px 0 20px;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    z-index: 20;
  }

  .site-header.nav-open .site-nav {
    display: flex;
  }

  .site-nav a,
  .site-nav .nav-search-btn {
    padding: 8px 16px;
  }

  /* 竖排菜单不需要分隔点 */
  .site-nav a:not(:last-child)::after,
  .site-nav .nav-search-btn::after {
    content: none;
  }

  .post-item-link {
    flex-direction: column;
    gap: 4px;
  }

  .post-item-excerpt {
    margin-left: 0;
  }

  .post-near {
    flex-direction: column;
    gap: 20px;
  }

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

  .comment-children { margin-left: 18px; }
}

@media (max-width: 640px) {
  /* 窄屏下收窄点号两侧间距，防菜单意外折行 */
  .site-nav a:not(:last-child)::after,
  .site-nav .nav-search-btn::after {
    margin: 0 0.35em;
  }

  /* 元数据双栏改单列 */
  .comment-meta-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}