/*
 * Xiaoeni's Blog · Butterfly visual refresh
 * Modern, restrained and optimized for Chinese long-form reading.
 */

:root {
  --blog-accent: #4f6fdf;
  --blog-accent-hover: #3f5cc5;
  --blog-accent-soft: rgba(79, 111, 223, 0.1);
  --blog-surface: rgba(255, 255, 255, 0.94);
  --blog-surface-solid: #ffffff;
  --blog-border: rgba(30, 41, 59, 0.09);
  --blog-muted: #778195;
  --blog-radius: 18px;
  --blog-radius-small: 12px;
  --blog-shadow: 0 14px 42px rgba(25, 38, 70, 0.07);
  --blog-shadow-hover: 0 20px 54px rgba(25, 38, 70, 0.12);
  --global-bg: #f4f7fb;
  --font-color: #354052;
  --text-highlight-color: #172033;
  --card-bg: var(--blog-surface);
  --sidebar-bg: #ffffff;
  --light-grey: #e8ecf3;
  --dark-grey: #a8b0bf;
  --btn-bg: var(--blog-accent);
  --btn-hover-color: var(--blog-accent-hover);
  --text-bg-hover: var(--blog-accent-soft);
  --blockquote-color: #566178;
  --blockquote-bg: rgba(79, 111, 223, 0.07);
  --toc-link-color: #6f798b;
  --scrollbar-color: #9caedc;
  --card-box-shadow: var(--blog-shadow);
  --card-hover-box-shadow: var(--blog-shadow-hover);
}

html {
  scroll-behavior: smooth;
}

body {
  background:
    radial-gradient(circle at 8% 5%, rgba(79, 111, 223, 0.1), transparent 27rem),
    radial-gradient(circle at 94% 25%, rgba(80, 170, 180, 0.07), transparent 25rem),
    var(--global-bg);
  color: var(--font-color);
  font-family:
    ui-sans-serif,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "PingFang SC",
    "Hiragino Sans GB",
    "Microsoft YaHei",
    sans-serif;
  letter-spacing: 0.012em;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a,
button,
input,
textarea {
  -webkit-tap-highlight-color: transparent;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 3px solid rgba(79, 111, 223, 0.34);
  outline-offset: 3px;
}

/* Header and hero */

#page-header {
  background-color: #25334d;
  background-position: center;
}

#page-header.full_page {
  min-height: 430px;
  max-height: 680px;
}

#page-header.full_page #site-info {
  padding: 0 22px;
}

#site-title {
  font-size: clamp(2.45rem, 6vw, 4.75rem);
  font-weight: 750;
  letter-spacing: 0.045em;
  line-height: 1.15;
  text-shadow: 0 8px 30px rgba(5, 12, 28, 0.3);
}

#site-subtitle {
  margin-top: 16px;
  font-size: clamp(1rem, 2vw, 1.25rem);
  font-weight: 400;
  letter-spacing: 0.08em;
  opacity: 0.9;
  text-shadow: 0 4px 18px rgba(5, 12, 28, 0.3);
}

#page-header #scroll-down .scroll-down-effects {
  width: 42px;
  height: 42px;
  border: 1px solid rgba(255, 255, 255, 0.32);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  line-height: 42px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

/* Navigation */

#nav {
  height: 64px;
  padding: 0 max(22px, calc((100vw - 1240px) / 2));
  font-size: 1.08rem;
}

#nav .site-name {
  font-weight: 700;
  letter-spacing: 0.025em;
  text-shadow: 0 2px 14px rgba(5, 12, 28, 0.25);
}

#nav .site-page {
  padding: 8px 2px;
  font-size: 0.88rem;
  font-weight: 550;
  letter-spacing: 0.025em;
}

#nav .menus_items .menus_item,
#nav #search-button {
  padding-left: 22px;
}

#nav .site-page:not(.child)::after {
  height: 2px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.85);
}

#page-header.nav-fixed #nav,
#page-header.not-top-img #nav {
  border-bottom: 1px solid rgba(30, 41, 59, 0.08);
  background: rgba(255, 255, 255, 0.86);
  box-shadow: 0 8px 30px rgba(25, 38, 70, 0.07);
  backdrop-filter: saturate(150%) blur(16px);
  -webkit-backdrop-filter: saturate(150%) blur(16px);
}

#page-header.nav-fixed #nav a,
#page-header.nav-fixed #nav #blog-info,
#page-header.not-top-img #nav a,
#page-header.not-top-img #nav #blog-info {
  color: #253047;
  text-shadow: none;
}

#nav .menus_items .menus_item .menus_item_child {
  margin-top: 10px;
  padding: 7px;
  border: 1px solid var(--blog-border);
  border-radius: 12px;
  background: var(--blog-surface-solid);
  box-shadow: var(--blog-shadow);
}

#nav .menus_items .menus_item .menus_item_child li,
#nav .menus_items .menus_item .menus_item_child li:first-child,
#nav .menus_items .menus_item .menus_item_child li:last-child {
  border-radius: 8px;
}

/* Page layout and shared cards */

.layout {
  max-width: 1240px;
  padding: 48px 20px 60px;
  gap: 24px;
}

.layout > div:first-child {
  width: calc(74% - 12px);
}

#aside-content {
  width: calc(26% - 12px);
  padding-left: 0;
}

.layout > div:first-child:not(.recent-posts),
#recent-posts > .recent-post-item,
#aside-content .card-widget,
#post-comment,
.relatedPosts,
#pagination.pagination-post {
  border: 1px solid var(--blog-border);
  border-radius: var(--blog-radius);
  background: var(--blog-surface);
  box-shadow: var(--blog-shadow);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.layout > div:first-child:not(.recent-posts) {
  padding: clamp(28px, 4.5vw, 54px);
}

#recent-posts > .recent-post-item,
#aside-content .card-widget {
  transition:
    transform 0.28s ease,
    box-shadow 0.28s ease,
    border-color 0.28s ease;
}

#recent-posts > .recent-post-item:hover,
#aside-content .card-widget:hover {
  border-color: rgba(79, 111, 223, 0.19);
  box-shadow: var(--blog-shadow-hover);
  transform: translateY(-4px);
}

/* Home article cards */

#recent-posts > .recent-post-item {
  min-height: 230px;
  height: 15.5rem;
  overflow: hidden;
}

#recent-posts > .recent-post-item:not(:first-child) {
  margin-top: 24px;
}

#recent-posts > .recent-post-item .post_cover {
  width: 39%;
}

#recent-posts > .recent-post-item > .recent-post-info {
  width: 61%;
  padding: 28px 38px;
}

#recent-posts > .recent-post-item > .recent-post-info.no-cover {
  width: 100%;
}

#recent-posts > .recent-post-item .post_cover .post-bg {
  transition:
    transform 0.65s cubic-bezier(0.2, 0.7, 0.2, 1),
    filter 0.35s ease;
}

#recent-posts > .recent-post-item:hover .post_cover .post-bg {
  filter: saturate(1.04) contrast(1.02);
  transform: scale(1.045);
}

#recent-posts > .recent-post-item > .recent-post-info > .article-title {
  color: var(--text-highlight-color);
  font-size: clamp(1.32rem, 2vw, 1.62rem);
  font-weight: 680;
  line-height: 1.45;
  letter-spacing: 0.01em;
}

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

#recent-posts > .recent-post-item > .recent-post-info > .article-meta-wrap {
  margin: 10px 0 12px;
  color: var(--blog-muted);
  font-size: 0.82rem;
  line-height: 1.7;
}

#recent-posts > .recent-post-item > .recent-post-info > .content {
  color: #616c7e;
  font-size: 0.95rem;
  line-height: 1.85;
}

/* Article reading experience */

#post {
  overflow: hidden;
}

#article-container {
  max-width: 800px;
  margin-right: auto;
  margin-left: auto;
  color: var(--font-color);
  font-size: 1.03rem;
  line-height: 1.95;
  letter-spacing: 0.018em;
}

#article-container p {
  margin-bottom: 1.25em;
}

#article-container h1,
#article-container h2,
#article-container h3,
#article-container h4 {
  color: var(--text-highlight-color);
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.45;
}

#article-container h1 {
  margin-top: 2.2em;
  font-size: 1.85rem;
}

#article-container h2 {
  margin-top: 2.1em;
  padding-bottom: 0.42em;
  border-bottom: 1px solid var(--blog-border);
  font-size: 1.55rem;
}

#article-container h3 {
  margin-top: 1.8em;
  font-size: 1.28rem;
}

#article-container h4 {
  margin-top: 1.6em;
  font-size: 1.1rem;
}

#article-container a {
  color: #4665c8;
  text-decoration-color: rgba(70, 101, 200, 0.32);
  text-decoration-line: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
}

#article-container a:hover {
  color: var(--blog-accent-hover);
  text-decoration-color: currentColor;
}

#article-container blockquote {
  margin: 1.6em 0;
  padding: 16px 20px;
  border-left: 4px solid var(--blog-accent);
  border-radius: 0 var(--blog-radius-small) var(--blog-radius-small) 0;
  background: var(--blockquote-bg);
  color: var(--blockquote-color);
}

#article-container code {
  margin: 0 0.12em;
  padding: 0.18em 0.42em;
  border: 1px solid rgba(79, 111, 223, 0.11);
  border-radius: 6px;
  background: rgba(79, 111, 223, 0.07);
  color: #bd4b5d;
  font-size: 0.88em;
}

#article-container pre code,
#article-container figure.highlight code {
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
}

#article-container figure.highlight {
  margin: 1.6em 0;
  overflow: hidden;
  border: 1px solid var(--blog-border);
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(25, 38, 70, 0.07);
}

#article-container img {
  border-radius: 12px;
  box-shadow: 0 10px 32px rgba(25, 38, 70, 0.1);
}

#article-container table {
  border-radius: 10px;
  font-size: 0.93rem;
}

#article-container table thead {
  background: rgba(79, 111, 223, 0.08);
}

#article-container table th,
#article-container table td {
  border-color: var(--blog-border);
  padding: 9px 13px;
}

#article-container ul,
#article-container ol {
  padding-left: 1.6em;
}

#article-container li {
  margin: 0.38em 0;
}

#post-info .post-title {
  max-width: 960px;
  margin-right: auto;
  margin-left: auto;
  font-size: clamp(1.8rem, 4.2vw, 3rem);
  font-weight: 720;
  letter-spacing: 0.015em;
  line-height: 1.35;
}

#post-info #post-meta {
  margin-top: 15px;
  font-size: 0.84rem;
  opacity: 0.88;
}

#post .post-copyright {
  margin-top: 44px;
  padding: 18px 20px;
  border-color: var(--blog-border);
  border-radius: 12px;
  background: rgba(79, 111, 223, 0.055);
}

/* Aside */

#aside-content .card-widget {
  margin-top: 24px;
  padding: 22px;
}

#aside-content .card-widget:first-child {
  margin-top: 0;
}

#aside-content .card-info .avatar-img {
  border: 4px solid rgba(255, 255, 255, 0.88);
  box-shadow: 0 8px 24px rgba(25, 38, 70, 0.13);
}

#aside-content .card-info .author-info__name {
  margin-top: 10px;
  color: var(--text-highlight-color);
  font-size: 1.32rem;
  font-weight: 700;
}

#aside-content .item-headline {
  padding-bottom: 12px;
  color: var(--text-highlight-color);
  font-size: 1rem;
  font-weight: 680;
}

#aside-content .aside-list > .aside-list-item {
  padding: 10px 0;
}

#aside-content .aside-list > .aside-list-item:not(:last-child) {
  border-bottom: 1px solid var(--blog-border);
}

#aside-content .aside-list > .aside-list-item .thumbnail {
  overflow: hidden;
  border-radius: 9px;
}

#aside-content .card-tag-cloud a {
  margin: 3px 2px;
  padding: 3px 9px;
  border-radius: 999px;
  background: rgba(79, 111, 223, 0.07);
  color: #5c6b87 !important;
  font-size: 0.8rem !important;
}

#aside-content .card-tag-cloud a:hover {
  background: var(--blog-accent);
  color: #fff !important;
}

#aside-content .card-archives ul.card-archive-list > .card-archive-list-item a,
#aside-content .card-categories ul.card-category-list > .card-category-list-item a {
  border-radius: 8px;
}

#aside-content .toc-content .toc-link.active {
  border-radius: 6px;
  background: var(--blog-accent-soft);
  color: var(--blog-accent);
  font-weight: 650;
}

/* Pagination and controls */

#pagination .page-number,
#pagination .extend {
  min-width: 36px;
  height: 36px;
  margin: 0 3px;
  border-radius: 10px;
  line-height: 36px;
}

#pagination .page-number.current {
  background: var(--blog-accent);
  box-shadow: 0 7px 18px rgba(79, 111, 223, 0.25);
}

#rightside > div > button,
#rightside > div > a {
  margin-bottom: 6px;
  overflow: hidden;
  border: 1px solid var(--blog-border);
  border-radius: 10px;
  background: var(--blog-surface);
  color: var(--font-color);
  box-shadow: 0 7px 22px rgba(25, 38, 70, 0.1);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

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

/* Footer */

#footer {
  background: transparent;
  color: var(--blog-muted);
}

#footer::before {
  display: none;
}

#footer-wrap {
  padding: 34px 20px;
  font-size: 0.85rem;
}

/* Dark mode */

html[data-theme="dark"] {
  --blog-accent: #8da6ff;
  --blog-accent-hover: #aec0ff;
  --blog-accent-soft: rgba(141, 166, 255, 0.12);
  --blog-surface: rgba(24, 31, 46, 0.94);
  --blog-surface-solid: #181f2e;
  --blog-border: rgba(217, 226, 255, 0.1);
  --blog-muted: #929db2;
  --blog-shadow: 0 16px 44px rgba(0, 0, 0, 0.21);
  --blog-shadow-hover: 0 22px 58px rgba(0, 0, 0, 0.3);
  --global-bg: #0f1420;
  --font-color: #c8d0df;
  --text-highlight-color: #edf1fa;
  --card-bg: var(--blog-surface);
  --sidebar-bg: #181f2e;
  --light-grey: #293246;
  --dark-grey: #5b667b;
  --btn-bg: #7894f5;
  --btn-hover-color: #97adff;
  --text-bg-hover: rgba(141, 166, 255, 0.12);
  --blockquote-color: #aeb8cb;
  --blockquote-bg: rgba(141, 166, 255, 0.09);
  --toc-link-color: #9aa5ba;
  --scrollbar-color: #566581;
  --card-box-shadow: var(--blog-shadow);
  --card-hover-box-shadow: var(--blog-shadow-hover);
}

html[data-theme="dark"] body {
  background:
    radial-gradient(circle at 8% 5%, rgba(104, 132, 225, 0.12), transparent 27rem),
    radial-gradient(circle at 94% 25%, rgba(65, 137, 149, 0.08), transparent 25rem),
    var(--global-bg);
}

html[data-theme="dark"] #page-header.nav-fixed #nav,
html[data-theme="dark"] #page-header.not-top-img #nav {
  border-bottom-color: var(--blog-border);
  background: rgba(15, 20, 32, 0.86);
}

html[data-theme="dark"] #page-header.nav-fixed #nav a,
html[data-theme="dark"] #page-header.nav-fixed #nav #blog-info,
html[data-theme="dark"] #page-header.not-top-img #nav a,
html[data-theme="dark"] #page-header.not-top-img #nav #blog-info {
  color: #e5eaf5;
}

html[data-theme="dark"] #recent-posts > .recent-post-item > .recent-post-info > .content {
  color: #aab4c7;
}

html[data-theme="dark"] #article-container a {
  color: #9bb0ff;
}

html[data-theme="dark"] #article-container code {
  border-color: rgba(141, 166, 255, 0.13);
  background: rgba(141, 166, 255, 0.1);
  color: #ff9aac;
}

html[data-theme="dark"] #article-container img {
  box-shadow: 0 12px 34px rgba(0, 0, 0, 0.26);
}

html[data-theme="dark"] #aside-content .card-info .avatar-img {
  border-color: rgba(255, 255, 255, 0.11);
}

html[data-theme="dark"] #aside-content .card-tag-cloud a {
  background: rgba(141, 166, 255, 0.1);
  color: #b9c4d9 !important;
}

html[data-theme="dark"] #rightside > div > button,
html[data-theme="dark"] #rightside > div > a {
  border-color: var(--blog-border);
  background: rgba(24, 31, 46, 0.92);
  color: #d8dfec;
}

/* Responsive */

@media screen and (max-width: 900px) {
  .layout {
    padding-top: 30px;
    gap: 24px;
  }

  .layout > div:first-child,
  #aside-content {
    width: 100%;
  }

  #aside-content {
    padding: 0;
  }
}

@media screen and (max-width: 768px) {
  :root {
    --blog-radius: 14px;
  }

  body {
    letter-spacing: 0;
  }

  #nav {
    height: 58px;
    padding: 0 16px;
  }

  #nav .menus_items .menus_item,
  #nav #search-button {
    padding-left: 14px;
  }

  #page-header.full_page {
    min-height: 390px;
    max-height: 570px;
  }

  #site-title {
    font-size: clamp(2.15rem, 12vw, 3.35rem);
  }

  .layout {
    padding: 22px 10px 42px;
  }

  .layout > div:first-child:not(.recent-posts) {
    padding: 28px 20px;
  }

  #recent-posts > .recent-post-item {
    min-height: 0;
    height: auto;
  }

  #recent-posts > .recent-post-item .post_cover {
    width: 100%;
    height: 210px;
  }

  #recent-posts > .recent-post-item > .recent-post-info {
    width: 100%;
    padding: 24px 22px 28px;
  }

  #recent-posts > .recent-post-item > .recent-post-info > .article-title {
    font-size: 1.3rem;
  }

  #article-container {
    font-size: 1rem;
    line-height: 1.88;
  }

  #article-container h1 {
    font-size: 1.62rem;
  }

  #article-container h2 {
    font-size: 1.4rem;
  }

  #article-container h3 {
    font-size: 1.2rem;
  }

  #post-info .post-title {
    font-size: clamp(1.65rem, 7.5vw, 2.25rem);
  }
}

@media screen and (max-width: 480px) {
  #page-header.full_page {
    min-height: 360px;
  }

  .layout {
    padding-right: 7px;
    padding-left: 7px;
  }

  .layout > div:first-child:not(.recent-posts) {
    padding: 25px 16px;
  }

  #recent-posts > .recent-post-item .post_cover {
    height: 190px;
  }

  #recent-posts > .recent-post-item > .recent-post-info {
    padding: 22px 18px 25px;
  }

  #article-container blockquote {
    padding: 13px 15px;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }

  #recent-posts > .recent-post-item:hover,
  #aside-content .card-widget:hover {
    transform: none;
  }
}