/* ==========================================================================
   Eric's Blog - Elegant Light Theme
   Designed for Butterfly 5.5.4
   ========================================================================== */

:root {
  --bg-primary: #F8F9FA;
  --bg-card: #FFFFFF;
  --text-primary: #2C3E50;
  --text-secondary: #5A6C7D;
  --text-muted: #95A5A6;
  --accent: #4A7DBE;
  --accent-light: #E8F0FE;
  --accent-dark: #3A6DAE;
  --border: rgba(0, 0, 0, 0.06);
  --border-light: rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 24px rgba(74, 125, 190, 0.12);
  --shadow-xl: 0 12px 36px rgba(74, 125, 190, 0.16);
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-primary: #1A1A2E;
  --bg-card: #16213E;
  --text-primary: #E4E6EB;
  --text-secondary: #B0B3B8;
  --text-muted: #6C757D;
  --accent: #6CA0DC;
  --accent-light: #1E3A5F;
  --accent-dark: #5B8FC7;
  --border: rgba(255, 255, 255, 0.08);
  --border-light: rgba(255, 255, 255, 0.05);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 12px 36px rgba(0, 0, 0, 0.5);
}

/* ==========================================================================
   Global Typography & Base
   ========================================================================== */
body {
  color: var(--text-primary);
  background: var(--bg-primary) !important;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

::selection {
  background: rgba(74, 125, 190, 0.2);
  color: var(--text-primary);
}

/* ==========================================================================
   Navigation Bar
   ========================================================================== */
#nav {
  font-size: 1.1rem;
  line-height: 32px;
}

#nav #blog-info {
  line-height: 32px;
  height: auto;
}

#nav a.site-page {
  font-size: 1.05rem !important;
  font-weight: 600 !important;
  letter-spacing: 0.5px;
  color: var(--text-primary) !important;
  padding: 0 12px !important;
  transition: var(--transition-fast);
}

#nav a.site-page:hover {
  color: var(--accent) !important;
}

#site-name {
  font-size: 1.05rem !important;
  font-weight: 700 !important;
  letter-spacing: 0.5px;
}

#page-header.nav-fixed #nav {
  background: rgba(248, 249, 250, 0.88) !important;
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
  border-bottom: 1px solid var(--border-light);
}

[data-theme="dark"] #page-header.nav-fixed #nav {
  background: rgba(26, 26, 46, 0.88) !important;
}

/* ==========================================================================
   Header / Hero Section
   ========================================================================== */
#page-header {
  background: var(--bg-primary) !important;
}

#page-header #site-info {
  padding: 8vh 0 6vh;
}

#site-title {
  font-size: 2.6rem !important;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--text-primary) !important;
  text-shadow: none !important;
  line-height: 1.2;
}

#site-subtitle {
  font-size: 1.1rem !important;
  color: var(--text-secondary) !important;
  margin-top: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.2px;
}

/* ==========================================================================
   Article Cards (Homepage)
   ========================================================================== */
#recent-posts > .recent-post-item {
  background: var(--bg-card) !important;
  border-radius: var(--radius) !important;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm) !important;
  transition: var(--transition);
  overflow: hidden;
  margin-bottom: 24px !important;
  padding: 0 !important;
}

#recent-posts > .recent-post-item:hover {
  box-shadow: var(--shadow-lg) !important;
  transform: translateY(-2px);
  border-color: rgba(74, 125, 190, 0.2);
}

#recent-posts .recent-post-info {
  padding: 28px 32px !important;
}

#recent-posts .recent-post-info .article-title {
  font-size: 1.4rem !important;
  font-weight: 650;
  color: var(--text-primary) !important;
  line-height: 1.4;
  margin-bottom: 8px;
  transition: var(--transition-fast);
}

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

#recent-posts .recent-post-info .article-meta-wrap {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

#recent-posts .recent-post-info .article-meta-wrap a {
  color: var(--text-secondary);
  transition: var(--transition-fast);
}

#recent-posts .recent-post-info .article-meta-wrap a:hover {
  color: var(--accent);
}

#recent-posts .recent-post-info .content {
  font-size: 0.95rem !important;
  color: var(--text-secondary) !important;
  line-height: 1.75;
  margin-top: 8px;
}

/* Article tags in meta */
.article-meta__separator {
  margin: 0 6px;
  color: var(--text-muted);
}

/* ==========================================================================
   Post / Article Page
   ========================================================================== */
#post {
  background: var(--bg-card) !important;
  border-radius: var(--radius) !important;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm) !important;
  padding: 36px 40px !important;
}

.post-title {
  font-size: 2rem !important;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 16px;
}

#post .post-meta {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-light);
}

/* Post content typography */
#article-container {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-primary);
}

#article-container h1,
#article-container h2,
#article-container h3,
#article-container h4,
#article-container h5,
#article-container h6 {
  color: var(--text-primary);
  font-weight: 650;
  line-height: 1.35;
  margin-top: 2em;
  margin-bottom: 0.7em;
}

#article-container h1 { font-size: 1.8rem; }
#article-container h2 { font-size: 1.55rem; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
#article-container h3 { font-size: 1.3rem; }
#article-container h4 { font-size: 1.15rem; }
#article-container h5 { font-size: 1.05rem; }
#article-container h6 { font-size: 0.95rem; color: var(--text-secondary); }

#article-container p {
  margin-bottom: 1.2em;
}

#article-container a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: var(--transition-fast);
}

#article-container a:hover {
  border-bottom-color: var(--accent);
}

#article-container blockquote {
  border-left: 4px solid var(--accent);
  background: var(--accent-light);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 16px 20px;
  margin: 1.5em 0;
  color: var(--text-primary);
  font-size: 0.95rem;
}

#article-container blockquote p {
  margin-bottom: 0.5em;
}

#article-container blockquote p:last-child {
  margin-bottom: 0;
}

#article-container ul,
#article-container ol {
  padding-left: 1.5em;
  margin-bottom: 1.2em;
}

#article-container li {
  margin-bottom: 0.3em;
}

#article-container li > ul,
#article-container li > ol {
  margin-top: 0.3em;
  margin-bottom: 0;
}

#article-container img {
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  max-width: 100%;
}

#article-container hr {
  border: none;
  height: 1px;
  background: var(--border);
  margin: 2em 0;
}

/* Code blocks */
#article-container figure.highlight {
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  margin: 1.5em 0;
}

#article-container .highlight .gutter {
  background: rgba(0, 0, 0, 0.03);
  border-right: 1px solid var(--border-light);
}

[data-theme="dark"] #article-container .highlight .gutter {
  background: rgba(255, 255, 255, 0.03);
}

#article-container code {
  font-family: "JetBrains Mono", "Fira Code", "Cascadia Code", Consolas, Monaco, monospace;
  font-size: 0.875em;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(74, 125, 190, 0.08);
  color: var(--accent-dark);
}

#article-container pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: 0.875rem;
  line-height: 1.7;
}

[data-theme="dark"] #article-container code {
  background: rgba(108, 160, 220, 0.12);
  color: var(--accent);
}

/* Tables */
#article-container table {
  width: 100%;
  border-collapse: collapse;
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  margin: 1.5em 0;
  font-size: 0.95rem;
}

#article-container th {
  background: var(--accent-light);
  color: var(--text-primary);
  font-weight: 600;
  padding: 12px 16px;
  text-align: left;
}

#article-container td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border-light);
}

/* ==========================================================================
   TOC (Table of Contents)
   ========================================================================== */
#aside-content .toc-widget {
  background: var(--bg-card) !important;
  border-radius: var(--radius) !important;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm) !important;
  padding: 16px;
}

.toc-widget .toc-title {
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.3px;
  color: var(--text-secondary);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.toc-widget .toc-link {
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--text-secondary);
  transition: var(--transition-fast);
}

.toc-widget .toc-link:hover,
.toc-widget .toc-link.active {
  color: var(--accent);
}

/* ==========================================================================
   Sidebar Cards
   ========================================================================== */
.card-widget {
  background: var(--bg-card) !important;
  border-radius: var(--radius) !important;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm) !important;
  transition: var(--transition);
  overflow: hidden;
  margin-bottom: 20px;
  padding: 20px 24px !important;
}

.card-widget:hover {
  box-shadow: var(--shadow-md) !important;
}

.card-widget .item-headline {
  font-size: 0.85rem;
  font-weight: 650;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-muted);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-light);
}

/* Author card */
.card-widget.card-info .author-info__name {
  font-size: 1.25rem !important;
  font-weight: 700;
}

.card-widget.card-info .author-info__description {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 4px;
  line-height: 1.5;
}

/* Tag cloud */
.card-tag-cloud a {
  color: var(--text-secondary) !important;
  font-size: 0.88rem !important;
  padding: 3px 10px;
  border-radius: 20px;
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  transition: var(--transition-fast);
  display: inline-block;
  margin: 3px 4px;
}

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

/* Archive list */
.card-archives ul.card-archive-list {
  padding-left: 0;
}

.card-archives ul.card-archive-list > li > a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: var(--transition-fast);
}

.card-archives ul.card-archive-list > li > a:hover {
  color: var(--accent);
}

/* Category list */
.card-category-list .card-category-list-item {
  font-size: 0.9rem;
}

.card-category-list .card-category-list-item > a {
  color: var(--text-secondary);
  transition: var(--transition-fast);
}

.card-category-list .card-category-list-item > a:hover {
  color: var(--accent);
}

/* Webinfo card */
.card-webinfo .webinfo-item {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   Pagination
   ========================================================================== */
#pagination {
  margin-top: 32px;
  margin-bottom: 24px;
}

#pagination .page-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 36px;
  padding: 0 8px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition: var(--transition-fast);
  margin: 0 3px;
}

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

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

#pagination .extend {
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: var(--transition-fast);
}

#pagination .extend:hover {
  color: var(--accent);
}

/* ==========================================================================
   Categories / Tags / Archives Pages
   ========================================================================== */
.category-lists .category-list,
.tag-cloud-list {
  padding: 0;
}

.category-lists .category-list a,
.tag-cloud-list a {
  color: var(--text-secondary);
  transition: var(--transition-fast);
}

.category-lists .category-list a:hover,
.tag-cloud-list a:hover {
  color: var(--accent);
}

/* Archives page */
.archives-wrap {
  background: var(--bg-card) !important;
  border-radius: var(--radius) !important;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm) !important;
  margin-bottom: 24px;
  overflow: hidden;
}

.archives-wrap .archive-year {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  padding: 20px 28px;
  margin: 0;
  background: var(--bg-card);
}

.archives-wrap .article-info {
  font-size: 0.95rem;
  padding: 14px 28px;
  border-top: 1px solid var(--border-light);
  transition: var(--transition-fast);
}

.archives-wrap .article-info:hover {
  background: var(--accent-light);
}

/* ==========================================================================
   Footer
   ========================================================================== */
#footer {
  background: var(--bg-primary) !important;
  border-top: 1px solid var(--border);
  padding: 32px 0;
  margin-top: 40px;
}

#footer #footer-wrap {
  color: var(--text-secondary) !important;
  font-size: 0.88rem;
}

#footer #footer-wrap a {
  color: var(--text-primary) !important;
  font-weight: 500;
  transition: var(--transition-fast);
}

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

#footer, #footer *, #footer-wrap, #footer-wrap * {
  color: var(--text-secondary) !important;
}

#footer a, #footer-wrap a {
  color: var(--text-primary) !important;
}

/* ==========================================================================
   Post Copyright
   ========================================================================== */
.post-copyright {
  background: var(--accent-light) !important;
  border-radius: var(--radius-sm) !important;
  border: 1px solid var(--border);
  padding: 16px 20px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   Related Posts
   ========================================================================== */
#relatedPosts .relatedPosts-list > div {
  background: var(--bg-card) !important;
  border-radius: var(--radius) !important;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm) !important;
  transition: var(--transition);
  overflow: hidden;
}

#relatedPosts .relatedPosts-list > div:hover {
  box-shadow: var(--shadow-lg) !important;
  transform: translateY(-2px);
}

/* ==========================================================================
   Back to Top / Right Side Buttons
   ========================================================================== */
#rightside > div > button,
#rightside > div > a {
  background: var(--bg-card) !important;
  border: 1px solid var(--border) !important;
  box-shadow: var(--shadow-sm) !important;
  border-radius: 8px !important;
  transition: var(--transition-fast);
}

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

/* ==========================================================================
   Search
   ========================================================================== */
#local-search .search-dialog {
  border-radius: var(--radius) !important;
  box-shadow: var(--shadow-xl) !important;
  border: 1px solid var(--border);
}

#local-search .search-dialog .search-nav {
  font-size: 0.9rem;
}

#local-search .search-result-list {
  font-size: 0.95rem;
}

#local-search .search-result-list .search-result {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-light);
}

#local-search .search-result-list .search-result a.search-result-title {
  font-weight: 600;
  color: var(--text-primary);
  transition: var(--transition-fast);
}

#local-search .search-result-list .search-result a.search-result-title:hover {
  color: var(--accent);
}

/* ==========================================================================
   Animations
   ========================================================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

#nav {
  animation: fadeIn 0.6s ease forwards;
}

#page-header #site-info {
  animation: fadeInUp 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) 0.15s both;
}

#recent-posts > .recent-post-item {
  animation: fadeInUp 0.5s ease both;
}

#recent-posts > .recent-post-item:nth-child(1) { animation-delay: 0.2s; }
#recent-posts > .recent-post-item:nth-child(2) { animation-delay: 0.32s; }
#recent-posts > .recent-post-item:nth-child(3) { animation-delay: 0.44s; }
#recent-posts > .recent-post-item:nth-child(4) { animation-delay: 0.56s; }
#recent-posts > .recent-post-item:nth-child(5) { animation-delay: 0.68s; }
#recent-posts > .recent-post-item:nth-child(6) { animation-delay: 0.8s; }

.card-widget {
  animation: fadeInUp 0.5s ease both;
}

#aside-content .card-widget:nth-child(1) { animation-delay: 0.35s; }
#aside-content .card-widget:nth-child(2) { animation-delay: 0.47s; }
#aside-content .card-widget:nth-child(3) { animation-delay: 0.59s; }
#aside-content .card-widget:nth-child(4) { animation-delay: 0.71s; }
#aside-content .card-widget:nth-child(5) { animation-delay: 0.83s; }

a,
button,
.recent-post-item,
.card-widget {
  transition: var(--transition);
}

/* ==========================================================================
   Smooth scrolling
   ========================================================================== */
html {
  scroll-behavior: smooth;
}

/* ==========================================================================
   Scrollbar
   ========================================================================== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: rgba(74, 125, 190, 0.25);
  border-radius: 4px;
  transition: background 0.2s ease;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(74, 125, 190, 0.45);
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */
@media screen and (max-width: 1100px) {
  #recent-posts .recent-post-info {
    padding: 22px 24px !important;
  }

  #post {
    padding: 28px 28px !important;
  }

  #site-title {
    font-size: 2.2rem !important;
  }
}

@media screen and (max-width: 768px) {
  #site-title {
    font-size: 1.8rem !important;
  }

  #site-subtitle {
    font-size: 1rem !important;
  }

  #recent-posts .recent-post-info {
    padding: 18px 20px !important;
  }

  #recent-posts .recent-post-info .article-title {
    font-size: 1.2rem !important;
  }

  #recent-posts .recent-post-info .content {
    font-size: 0.9rem !important;
  }

  #post {
    padding: 22px 20px !important;
  }

  .post-title {
    font-size: 1.5rem !important;
  }

  #article-container h1 { font-size: 1.5rem; }
  #article-container h2 { font-size: 1.3rem; }
  #article-container h3 { font-size: 1.15rem; }

  .card-widget {
    padding: 16px 18px !important;
  }

  #page-header #site-info {
    padding: 4vh 0 3vh;
  }
}

@media screen and (max-width: 480px) {
  #site-title {
    font-size: 1.5rem !important;
  }

  #recent-posts > .recent-post-item {
    margin-bottom: 16px !important;
  }

  #post {
    padding: 18px 16px !important;
  }

  .post-title {
    font-size: 1.3rem !important;
  }

  #article-container {
    font-size: 0.95rem;
  }
}

/* ==========================================================================
   Print Styles
   ========================================================================== */
@media print {
  #nav,
  #aside-content,
  #footer,
  #rightside,
  .post-copyright,
  #relatedPosts {
    display: none !important;
  }

  #post {
    box-shadow: none !important;
    border: none !important;
    padding: 0 !important;
  }

  body {
    background: #fff !important;
    color: #000 !important;
  }
}