:root {
  /* Light Theme (Even-like) */
  --bg-color: #f8f5ec;
  --bg-content: #ffffff;
  --text-color: #34495e;
  --text-title: #273849;
  --text-muted: #8a8a8a;
  --accent-color: #c05b4d;
  --border-color: #e5e5e5;
  --code-bg: #f5f5f5;
  --header-bg: #f8f5ec;
  
  --font-sans: "Source Sans Pro", "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Noto Serif SC", serif;
  --font-mono: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
  
  --content-width: 800px;
}

[data-theme="dark"] {
  /* Dark Theme */
  --bg-color: #1d1f21;
  --bg-content: #282a2e;
  --text-color: #c5c8c6;
  --text-title: #ffffff;
  --text-muted: #969896;
  --accent-color: #cc6666;
  --border-color: #373b41;
  --code-bg: #1d1f21;
  --header-bg: #1d1f21;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  transition: background-color 0.3s, color 0.3s;
}

a {
  color: var(--accent-color);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--text-title);
  border-bottom: 1px solid var(--text-title);
}

/* Header */
.header {
  padding: 2rem 1rem;
  background-color: var(--header-bg);
  text-align: center;
}

.header-container {
  max-width: var(--content-width);
  margin: 0 auto;
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: bold;
  color: var(--text-title);
  margin-bottom: 0;
  border-bottom: none !important;
}

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

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 1.1rem;
}

.nav-menu a {
  color: var(--text-color);
  border-bottom: none;
}
.nav-menu a:hover {
  color: var(--accent-color);
}

#theme-toggle {
  background: none;
  border: none;
  color: var(--text-color);
  cursor: pointer;
  padding: 0.5rem;
  transition: color 0.2s;
  display: flex;
  align-items: center;
}

#theme-toggle:hover {
  color: var(--accent-color);
}

/* Terms (Categories & Tags) */
.terms-list {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  list-style: none;
  margin-top: 2rem;
}

.terms-list li a {
  display: inline-block;
  padding: 0.4rem 0.8rem;
  background: var(--code-bg);
  border-radius: 4px;
  color: var(--text-title);
  border-bottom: none;
  transition: all 0.2s;
}

.terms-list li a:hover {
  background: var(--accent-color);
  color: #fff;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  align-items: center;
  margin-top: 2rem;
}

.tag-cloud a {
  color: var(--text-color);
  border-bottom: none;
  transition: color 0.2s;
}

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

/* Main Content */
.main-content {
  flex: 1;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 1rem 3rem 1rem;
  width: 100%;
}

/* Article Styles */
.article-content {
  background: var(--bg-content);
  padding: 2.5rem;
  border-radius: 5px;
  box-shadow: 0 0 5px rgba(0,0,0,0.05);
  margin-bottom: 2rem;
}

.article-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.article-title {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 1rem;
}

.article-meta {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Typography inside posts */
.article-content {
  line-height: 1.8;
  font-size: 1.05rem;
}

.article-content h1,
.article-content h2,
.article-content h3,
.article-content h4,
.article-content h5,
.article-content h6 {
  font-family: var(--font-serif);
  color: var(--text-title);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  font-weight: 700;
  line-height: 1.3;
}

.article-content h1 {
  font-size: 2.2rem;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.article-content h2 {
  font-size: 1.75rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.4rem;
}

.article-content h3 {
  font-size: 1.4rem;
}

.article-content h4 {
  font-size: 1.2rem;
}

.article-content p {
  margin-bottom: 1.4em;
}

.article-content ul,
.article-content ol {
  margin-bottom: 1.4em;
  padding-left: 2rem;
}

.article-content li {
  margin-bottom: 0.5em;
}

.article-content li > p {
  margin-bottom: 0.5em;
}

.article-content blockquote {
  padding: 1rem 1.5rem;
  margin: 1.8rem 0;
  border-left: 5px solid var(--accent-color);
  background-color: var(--code-bg);
  color: var(--text-muted);
  font-style: italic;
  border-radius: 0 4px 4px 0;
}

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

.article-content img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 2rem auto;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s;
}

.article-content img:hover {
  transform: scale(1.02);
}

.article-content hr {
  border: 0;
  height: 1px;
  background: var(--border-color);
  margin: 2.5rem 0;
}

/* Tables */
.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  font-size: 0.95rem;
  border-radius: 6px;
  overflow: hidden;
  box-shadow: 0 0 0 1px var(--border-color);
}

.article-content th,
.article-content td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  text-align: left;
}

.article-content th {
  background-color: var(--code-bg);
  font-weight: 600;
  color: var(--text-title);
}

.article-content tr:last-child td {
  border-bottom: none;
}

.article-content tr:nth-child(even) {
  background-color: rgba(0, 0, 0, 0.02);
}

[data-theme="dark"] .article-content tr:nth-child(even) {
  background-color: rgba(255, 255, 255, 0.02);
}

/* Links */
.article-content a {
  color: var(--accent-color);
  text-decoration: none;
  border-bottom: 1px dotted var(--accent-color);
  transition: all 0.2s;
}

.article-content a:hover {
  color: var(--text-title);
  border-bottom: 1px solid var(--text-title);
}

/* Code */
.article-content pre {
  position: relative;
  background: #282c34;
  padding: 2.5rem 1.2rem 1.2rem 1.2rem;
  border-radius: 8px;
  overflow-x: auto;
  margin: 1.8rem 0;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  line-height: 1.6;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1), 0 1px 3px rgba(0,0,0,0.08);
}

.article-content pre::before {
  content: "";
  position: absolute;
  top: 15px;
  left: 15px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #ff5f56;
  box-shadow: 20px 0 0 #ffbd2e, 40px 0 0 #27c93f;
}

.article-content code {
  background: rgba(192, 91, 77, 0.1);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-family: var(--font-mono);
  color: var(--accent-color);
  font-size: 0.9em;
}

[data-theme="dark"] .article-content code {
  background: rgba(204, 102, 102, 0.15);
}

.article-content pre code {
  padding: 0;
  color: #abb2bf;
  background: transparent;
  font-size: 0.95em;
}

/* Post List */
.post-list {
  list-style: none;
}

.post-item {
  background: var(--bg-content);
  padding: 2rem;
  border-radius: 5px;
  box-shadow: 0 0 5px rgba(0,0,0,0.05);
  margin-bottom: 2rem;
}

.post-link {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: bold;
  color: var(--text-title);
  display: block;
  margin-bottom: 0.5rem;
  border-bottom: none !important;
}

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

.post-date {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.post-excerpt {
  color: var(--text-color);
  margin-bottom: 1rem;
}

.read-more {
  display: inline-block;
  color: var(--accent-color);
  border-bottom: 1px solid var(--accent-color);
  font-size: 0.9rem;
  padding-bottom: 2px;
}
.read-more:hover {
  color: var(--text-title);
  border-bottom-color: var(--text-title);
}

/* Footer */
.footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Back to Top Button */
#back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 3rem;
  height: 3rem;
  background-color: var(--accent-color);
  color: #fff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s, transform 0.2s;
  z-index: 1000;
}

#back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 8px rgba(0,0,0,0.15);
}

#back-to-top.show {
  opacity: 1;
  visibility: visible;
}


/* Search and Category Nav */
.search-container {
    margin-bottom: 1.5rem;
}

#search-input {
    width: 100%;
    padding: 1rem 1.5rem;
    font-size: 1.1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-color);
    color: var(--text-color);
    transition: border-color 0.3s, box-shadow 0.3s;
    outline: none;
    box-sizing: border-box;
}

#search-input:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(255, 95, 86, 0.2);
}

.category-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    margin-bottom: 2.5rem;
}

.category-pill {
    padding: 0.5rem 1rem;
    border-radius: 20px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    cursor: pointer;
    font-size: 0.95rem;
    transition: all 0.2s ease;
}

.category-pill:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.category-pill.active {
    background: var(--accent-color);
    color: #fff;
    border-color: var(--accent-color);
    box-shadow: 0 2px 4px rgba(255, 95, 86, 0.3);
}