/* =========================================================
   Site design system —— 全站视觉层
   入口：_config.butterfly.yml -> inject.head（在 hero.css 之前）
   思路：不改模板逻辑，只重写表现层；所有颜色/间距收敛到 token，
         浅色是"内页"，暗色是"封面"的同一套语言。
   ========================================================= */

/* ---------------------------------------------------------
   1. Tokens
   --------------------------------------------------------- */
:root {
  --ink: #171b1d;
  --ink-2: #59646a;
  --ink-3: #8b979d;
  --paper: #ffffff;
  --paper-2: #f6f7f6;
  --paper-3: #eef1f1;
  --line: #e4e8e9;
  --line-strong: #d2dadb;
  --accent: #1f6fb2;
  --accent-2: #17568c;
  --accent-soft: rgba(31, 111, 178, 0.08);
  --radius-s: 6px;
  --radius-m: 12px;
  --radius-l: 18px;
  --shadow-1: 0 1px 2px rgba(23, 27, 29, 0.05);
  --shadow-2: 0 14px 36px -22px rgba(23, 27, 29, 0.45);
  --ease: cubic-bezier(0.19, 1, 0.22, 1);
  --read-width: 740px;
  --card-pad: 26px;

  /* 主题既有变量的映射 */
  --global-bg: var(--paper-2);
  --font-color: var(--ink);
  --card-bg: var(--paper);
  --card-meta: var(--ink-3);
  --card-box-shadow: none;
  --card-hover-box-shadow: none;
  --default-bg-color: var(--accent);
  --text-highlight-color: var(--ink);
  --btn-bg: var(--accent);
  --btn-color: #ffffff;
  --btn-hover-color: var(--accent-2);
  --scrollbar-color: #c6cfd1;
  --mark-bg: rgba(9, 12, 14, 0.45);
  --toc-link-color: var(--ink-2);
  --blockquote-color: var(--ink-2);
  --blockquote-bg: transparent;
}

[data-theme='dark'] {
  --ink: #e8edef;
  --ink-2: #a2afb5;
  --ink-3: #718087;
  --paper: #111a20;
  --paper-2: #0b1116;
  --paper-3: #0e161c;
  --line: #1d2930;
  --line-strong: #28363e;
  --accent: #6cb3e2;
  --accent-2: #8ecbed;
  --accent-soft: rgba(108, 179, 226, 0.1);
  --shadow-1: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-2: 0 18px 40px -24px rgba(0, 0, 0, 0.8);

  --global-bg: var(--paper-2);
  --font-color: var(--ink);
  --card-bg: var(--paper);
  --card-meta: var(--ink-3);
  --btn-bg: var(--accent);
  --btn-color: #08131a;
  --btn-hover-color: var(--accent-2);
  --scrollbar-color: #28363e;
  --search-bg: var(--paper);
  --sidebar-bg: var(--paper-2);
  --sidebar-menu-bg: var(--paper);
}

/* ---------------------------------------------------------
   2. Base
   --------------------------------------------------------- */
body {
  background: var(--paper-2);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

*:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

a {
  color: var(--accent);
  transition: color 0.25s var(--ease);
}

a:hover {
  color: var(--accent-2);
}

/* ---------------------------------------------------------
   3. 导航
   --------------------------------------------------------- */
#nav {
  padding: 0 22px;
}

#nav .site-name {
  font-weight: 600;
  letter-spacing: -0.01em;
}

#nav #blog-info > a:first-child {
  transition: opacity 0.25s var(--ease);
}

#nav #blog-info > a:first-child:hover {
  opacity: 0.7;
}

#nav .site-icon,
#nav .avatar-img {
  border-radius: 8px;
}

#nav #menus .site-page {
  font-size: 13.5px;
  letter-spacing: 0.01em;
  transition: color 0.25s var(--ease);
}

#page-header.nav-fixed #nav {
  background: color-mix(in srgb, var(--paper) 84%, transparent);
  border-bottom: 1px solid var(--line);
  box-shadow: none;
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  backdrop-filter: saturate(180%) blur(14px);
}

#page-header.nav-fixed #nav .site-name,
#page-header.nav-fixed #nav a,
#page-header.nav-fixed #nav .site-page {
  color: var(--ink);
}

/* ---------------------------------------------------------
   4. 容器与卡片
   --------------------------------------------------------- */
#content-inner {
  padding-top: 28px;
}

#content-inner.layout > #recent-posts,
#content-inner.layout > #post,
#content-inner.layout > #page {
  min-width: 0;
}

#recent-posts .recent-post-item,
.card-widget,
#post,
#page {
  border-radius: var(--radius-m);
}

.card-widget {
  background: var(--paper);
  border: 1px solid var(--line);
  box-shadow: none;
  overflow: hidden;
}

.card-widget .item-headline {
  padding: 18px 20px 12px;
  margin-bottom: 0;
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.card-widget .item-headline i {
  color: var(--accent);
}

/* ---------------------------------------------------------
   5. 首页文章列表
   主题用 #recent-posts 前缀抬高特异性，这里必须对齐或更高
   --------------------------------------------------------- */
#recent-posts .recent-post-item {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  box-shadow: none;
  margin-bottom: 18px;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

/* 无封面的纯文字卡片不必锁死主题的 16.8em 定高 */
#recent-posts .recent-post-item:has(> .recent-post-info.no-cover) {
  height: auto;
}

#recent-posts .recent-post-item:hover {
  border-color: color-mix(in srgb, var(--accent) 32%, var(--line));
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
}

#recent-posts .recent-post-item > .recent-post-info {
  padding: var(--card-pad);
}

#recent-posts .recent-post-item > .recent-post-info > .article-title {
  color: var(--ink);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.012em;
  line-height: 1.45;
  transition: color 0.25s var(--ease);
}

#recent-posts .recent-post-item:hover > .recent-post-info > .article-title {
  color: var(--accent);
}

#recent-posts .recent-post-item > .recent-post-info > .article-meta-wrap {
  margin: 12px 0 14px;
  color: var(--ink-3);
  font-size: 12.5px;
  line-height: 1.8;
}

#recent-posts .recent-post-item .article-meta-wrap a,
#recent-posts .recent-post-item .article-meta-wrap .article-meta-label {
  color: var(--ink-3);
}

#recent-posts .recent-post-item .article-meta-wrap i {
  color: var(--ink-3);
  opacity: 0.8;
}

#recent-posts .recent-post-item > .recent-post-info > .content {
  color: var(--ink-2);
  font-size: 14.5px;
  line-height: 1.78;
}

#recent-posts .recent-post-item .post_cover img.post-bg {
  filter: saturate(0.92);
  transition: transform 0.6s var(--ease), filter 0.6s var(--ease);
}

#recent-posts .recent-post-item:hover .post_cover img.post-bg {
  transform: scale(1.03);
  filter: saturate(1);
}

#recent-posts .recent-post-item .sticky {
  color: var(--accent);
}

/* ---------------------------------------------------------
   6. 文章页
   --------------------------------------------------------- */
#page-header.post-bg #post-info #post-meta .post-meta-pv {
  display: inline;
}

/* 文章页头：与首页 hero 同一套深墨底与排版语言 */
#page-header.post-bg {
  display: flex;
  align-items: center;
  height: min(52vh, 500px);
  background-color: #0b1116;
}

/* 底图退成暗场，只留右上角一层空气光，与首页一致 */
#page-header.post-bg:before {
  background:
    radial-gradient(120% 78% at 76% 6%, rgba(78, 168, 222, 0.13), transparent 58%),
    linear-gradient(180deg, #0b1116 0%, #0a1015 62%, #080d11 100%);
}

/* 主题用 #page-header.post-bg #post-info 的绝对定位压在这里，必须对齐特异性 */
#page-header.post-bg #post-info {
  position: static !important;
  top: auto !important;
  bottom: auto !important;
  width: 100%;
  z-index: 3;
  text-align: left;
}

.post-eyebrow {
  margin-bottom: 18px;
  color: rgba(244, 247, 248, 0.5);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.16em;
}

#post-info .post-title {
  max-width: 1080px;
  margin: 0;
  color: #f4f7f8;
  font-size: clamp(2rem, 4.4vw, 3.5rem);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.025em;
  text-shadow: none;
  text-wrap: balance;
}

/* 元信息：一条细线 + 等宽日期，对应首页「最新一篇」的处理 */
/* 主题给 #post-info 的每个直接子元素都套了 max-width + 居中 + 15px 内边距，
   这里必须保持一致，否则元信息会跑到页面最左边 */
#page-header.post-bg #post-info #post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-start;
  gap: 0;
  margin: 24px auto 0;
  padding: 0 15px;
  max-width: 1200px;
}

#page-header.post-bg #post-info #post-meta .meta-firstline,
#page-header.post-bg #post-info #post-meta .meta-secondline {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
}

#post-meta span,
#post-meta a {
  color: rgba(244, 247, 248, 0.62);
  font-size: 12.5px;
  letter-spacing: 0.02em;
}

#post-meta time {
  color: rgba(244, 247, 248, 0.82);
  font-family: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  font-size: 12px;
  letter-spacing: 0.04em;
}

#post-meta i {
  color: rgba(244, 247, 248, 0.4);
  font-size: 12px;
}

#page-header.post-bg #post-info #post-meta .post-meta-separator {
  margin: 0 10px;
  color: rgba(244, 247, 248, 0.24);
}

#page-header.post-bg #post-info #post-meta .post-meta-date,
#page-header.post-bg #post-info #post-meta .post-meta-categories,
#page-header.post-bg #post-info #post-meta .post-meta-pv {
  white-space: nowrap;
}

#page-header.post-bg #post-info #post-meta .meta-secondline:not(:empty):before {
  content: '|';
  margin: 0 10px;
  color: rgba(244, 247, 248, 0.24);
}

#post {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 8px var(--card-pad) 32px;
}

/* 顶部阅读进度线 */
.read-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: 0 50%;
  opacity: 0.85;
  z-index: 9999;
  pointer-events: none;
}

#post-info {
  text-align: left;
}

#post-info .post-title {
  font-size: clamp(1.65rem, 3vw, 2.15rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
  color: #fff;
  text-shadow: 0 1px 24px rgba(9, 12, 14, 0.55);
}

#post-info .post-meta {
  color: rgba(255, 255, 255, 0.82);
  font-size: 13px;
  letter-spacing: 0.01em;
}

#post-info .post-meta a,
#post-info .post-meta i {
  color: rgba(255, 255, 255, 0.82);
}

#post-info hr {
  border-color: rgba(255, 255, 255, 0.25);
}

#article-container {
  color: var(--ink);
  font-size: 16.5px;
  line-height: 1.86;
  letter-spacing: 0.005em;
  max-width: var(--read-width);
  margin-inline: auto;
}

/* 正文内链接：下划线更明确 */
#article-container a:not(.headerlink):not([class*='btn']) {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  text-decoration-color: color-mix(in srgb, var(--accent) 35%, transparent);
  transition: text-decoration-color 0.25s var(--ease);
}

#article-container a:not(.headerlink):not([class*='btn']):hover {
  text-decoration-color: var(--accent);
}

/* 标题层级 */
#article-container h1,
#article-container h2,
#article-container h3,
#article-container h4,
#article-container h5,
#article-container h6 {
  color: var(--ink);
  font-weight: 700;
  letter-spacing: -0.012em;
  line-height: 1.4;
}

#article-container h2 {
  margin: 2.6em 0 0.9em;
  padding-bottom: 0.45em;
  border-bottom: 1px solid var(--line);
  font-size: 1.42em;
}

#article-container h3 {
  margin: 2em 0 0.75em;
  font-size: 1.2em;
}

#article-container h4 {
  margin: 1.7em 0 0.6em;
  font-size: 1.06em;
}

#article-container h1:before,
#article-container h2:before,
#article-container h3:before,
#article-container h4:before,
#article-container h5:before,
#article-container h6:before {
  display: none;
}

/* 段落与列表 */
#article-container p {
  margin: 0 0 1.15em;
}

#article-container ul,
#article-container ol {
  padding-left: 1.4em;
  margin: 0 0 1.15em;
}

#article-container li {
  margin: 0.35em 0;
}

#article-container li::marker {
  color: var(--ink-3);
}

/* 引用 */
#article-container blockquote {
  margin: 1.6em 0;
  padding: 4px 0 4px 20px;
  border-left: 2px solid var(--accent);
  background: transparent;
  color: var(--ink-2);
  font-size: 0.98em;
}

/* 表格 */
#article-container table {
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  border-collapse: separate;
  border-spacing: 0;
  overflow: hidden;
  font-size: 0.94em;
}

#article-container table th {
  background: var(--paper-3);
  color: var(--ink);
  font-weight: 600;
  border-color: var(--line);
}

#article-container table td {
  border-color: var(--line);
  background: transparent;
}

#article-container table tr:nth-child(even) {
  background: transparent;
}

/* 图片 */
#article-container img {
  border-radius: var(--radius-s);
}

/* 行内代码 */
#article-container code:not([class*='language-']):not(.hljs) {
  padding: 0.15em 0.42em;
  border-radius: 4px;
  background: var(--accent-soft);
  color: var(--accent-2);
  font-size: 0.9em;
}

[data-theme='dark'] #article-container code:not([class*='language-']):not(.hljs) {
  color: var(--accent);
}

/* 代码块外框 */
#article-container figure.highlight,
#article-container .code-container {
  border-radius: var(--radius-s);
  border: 1px solid rgba(255, 255, 255, 0.06);
  margin: 1.6em 0;
}

#article-container figure.highlight .gutter {
  border-right: 1px solid rgba(255, 255, 255, 0.06);
}

/* 分隔线 */
#article-container hr {
  height: 1px;
  margin: 2.6em 0;
  border: none;
  background: var(--line);
}

#article-container hr:before {
  display: none;
}

/* 版权块与标签 */
.post-copyright {
  margin-top: 34px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--accent);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  background: var(--paper-3);
  color: var(--ink-2);
  font-size: 13px;
}

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

.post-meta__tags {
  border-bottom: 1px solid var(--line-strong) !important;
  color: var(--ink-2) !important;
  font-size: 12.5px;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.post-meta__tags:hover {
  color: var(--accent) !important;
  border-color: var(--accent) !important;
}

/* ---------------------------------------------------------
   7. 目录
   --------------------------------------------------------- */
#card-toc {
  padding: 0 0 14px;
}

#card-toc > .toc {
  padding: 0 14px;
}

#card-toc .toc-link {
  color: var(--ink-2);
  font-size: 13px;
  transition: color 0.2s var(--ease);
}

#card-toc .toc-link:hover {
  color: var(--accent);
}

#card-toc .toc-link.active {
  background: var(--accent-soft) !important;
  color: var(--accent) !important;
  font-weight: 500;
}

#card-toc .toc-link:before,
#card-toc .toc-link.active:before {
  display: none;
}

#card-toc .toc-number {
  color: var(--ink-3);
}

/* ---------------------------------------------------------
   8. 侧栏
   --------------------------------------------------------- */
#aside-content .card-announcement .item-headline i {
  color: var(--accent);
}

#aside-content .item-headline i {
  color: var(--accent);
}

.aside-content .card-info {
  padding-bottom: 4px;
}

.card-info .author-info-name {
  color: var(--ink);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.card-info .author-info-description {
  color: var(--ink-3);
  font-size: 13px;
}

.card-info .site-data a {
  color: var(--ink-2);
  transition: color 0.25s var(--ease);
}

.card-info .site-data a:hover {
  color: var(--accent);
}

.card-info .site-data .headline {
  color: var(--ink-3);
  font-size: 12px;
}

.card-info .site-data .length-num {
  color: var(--ink);
  font-family: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

#card-info-btn {
  border-radius: var(--radius-s) !important;
  background: var(--accent) !important;
  font-size: 13px !important;
  letter-spacing: 0.02em;
  transition: background 0.25s var(--ease);
}

#card-info-btn:hover {
  background: var(--accent-2) !important;
}

.aside-list-item {
  border-bottom: 1px dashed var(--line);
}

.aside-list-item .title {
  color: var(--ink-2);
  font-size: 13px;
  transition: color 0.25s var(--ease);
}

.aside-list-item:hover .title {
  color: var(--accent);
}

.aside-list-item time {
  color: var(--ink-3);
  font-size: 11.5px;
}

/* ---------------------------------------------------------
   9. 分页
   --------------------------------------------------------- */
#pagination .page-number,
#pagination .extend {
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  background: var(--paper);
  color: var(--ink-2);
  transition: all 0.25s var(--ease);
}

#pagination .page-number:hover,
#pagination .extend:hover {
  border-color: var(--accent);
  color: var(--accent);
}

#pagination .page-number.current {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.pagination-related {
  border-radius: var(--radius-m);
  overflow: hidden;
}

.pagination-related .info-item-1 {
  color: var(--ink-3);
  font-size: 12px;
}

.pagination-related .info-item-2 {
  color: var(--ink);
  font-size: 14px;
}

/* ---------------------------------------------------------
   10. 归档 / 分类 / 标签
   --------------------------------------------------------- */
#archive {
  padding: 8px var(--card-pad) 24px;
}

#archive .article-sort {
  border-left-color: var(--line-strong);
}

#archive .article-sort-title {
  color: var(--ink);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.015em;
}

#archive .article-sort-title:before {
  border-color: var(--accent);
  background: var(--paper);
}

#archive .article-sort-title:after {
  background: var(--line-strong);
}

#archive .article-sort-item {
  margin: 0 0 14px 10px;
}

/* 无封面时主题锁死 80px 定高，条目之间会空出一大截 */
#archive .article-sort-item.no-article-cover {
  height: auto;
}

#archive .article-sort-item:before {
  background: var(--paper);
  border: 2px solid var(--line-strong);
}

#archive .article-sort-item:hover:before {
  border-color: var(--accent);
}

#archive .article-sort-item-title {
  color: var(--ink-2);
  font-size: 14px;
  transition: color 0.25s var(--ease);
}

#archive .article-sort-item:hover .article-sort-item-title {
  color: var(--accent);
}

#archive .article-sort-item-time {
  color: var(--ink-3);
  font-size: 12px;
}

.category-lists .category-content,
.tag-cloud a {
  border-radius: var(--radius-s);
}

.tag-cloud a {
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink-2);
  font-size: 12.5px !important;
  transition: all 0.25s var(--ease);
}

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

#page-site-info #site-title {
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* ---------------------------------------------------------
   11. 页脚
   --------------------------------------------------------- */
#footer {
  background: transparent;
  padding: 26px 16px 34px;
  border-top: 1px solid var(--line);
  margin-top: 26px;
}

#footer .footer-copyright,
#footer .copyright,
#footer .framework-info {
  color: var(--ink-3);
  font-size: 12.5px;
  letter-spacing: 0.01em;
}

#footer a {
  color: var(--ink-2);
}

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

#footer .footer-separator {
  color: var(--line-strong);
}

/* ---------------------------------------------------------
   12. 右侧悬浮
   --------------------------------------------------------- */
#rightside > div > button,
#rightside > div > a {
  border-radius: var(--radius-s);
  background: var(--paper);
  border: 1px solid var(--line);
  color: var(--ink-2);
  box-shadow: var(--shadow-1);
  transition: all 0.25s var(--ease);
}

#rightside > div > button:hover,
#rightside > div > a:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* ---------------------------------------------------------
   13. 深色模式下的补充
   --------------------------------------------------------- */
[data-theme='dark'] .card-widget,
[data-theme='dark'] .recent-post-item,
[data-theme='dark'] #post {
  border-color: var(--line);
}

[data-theme='dark'] #nav.nav-fixed,
[data-theme='dark'] #page-header.nav-fixed #nav {
  background: color-mix(in srgb, var(--paper-2) 84%, transparent);
}

[data-theme='dark'] #card-info-btn {
  background: var(--accent-soft) !important;
  color: var(--accent) !important;
  border: 1px solid color-mix(in srgb, var(--accent) 26%, transparent);
}

[data-theme='dark'] #card-info-btn:hover {
  background: color-mix(in srgb, var(--accent) 20%, transparent) !important;
}

[data-theme='dark'] #footer {
  border-top-color: var(--line);
}

/* ---------------------------------------------------------
   14. 移动端
   --------------------------------------------------------- */
@media (max-width: 768px) {
  :root {
    --card-pad: 18px;
  }

  #content-inner {
    padding-top: 16px;
  }

  #recent-posts .recent-post-item {
    margin-bottom: 14px;
  }

  #recent-posts .recent-post-item > .recent-post-info > .article-title {
    font-size: 17px;
  }

  #article-container {
    font-size: 16px;
    line-height: 1.8;
  }

  #post {
    padding: 4px 18px 24px;
  }

  #post-info .post-title {
    font-size: 1.35rem;
    line-height: 1.3;
  }

  #page-header.post-bg {
    height: 420px;
  }



  .post-eyebrow {
    margin-bottom: 14px;
    font-size: 11px;
  }

  #post-info #post-meta {
    margin-top: 18px;
    padding-top: 14px;
  }

  #nav {
    padding: 0 16px;
  }

  #footer {
    padding: 20px 16px 28px;
  }
}

/* ---------------------------------------------------------
   15. 减少动效
   --------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  #recent-posts .recent-post-item,
  #recent-posts .recent-post-item .post_cover img.post-bg,
  #article-container a {
    transition: none !important;
  }

  #recent-posts .recent-post-item:hover {
    transform: none;
  }

  #recent-posts .recent-post-item:hover .post_cover img.post-bg {
    transform: none;
  }
}