:root {
  --bg-color: #0a0a0a;
  --text-color: #f0f0f0;
  --border-color: #333;
  --card-bg: #111;
  --card-hover-border: #555;
  --tag-bg: #222;
  --code-bg: #161616;
  --link-color: #e0e0e0;
}

[data-theme="light"] {
  --bg-color: #f5f5f5;
  --text-color: #121212;
  --border-color: #ddd;
  --card-bg: #fff;
  --card-hover-border: #999;
  --tag-bg: #e9e9e9;
  --code-bg: #eaeaea;
  --link-color: #222;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* Star background */
#space-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.star {
  position: absolute;
  background-color: var(--text-color);
  border-radius: 50%;
  width: 3px;
  height: 3px;
  animation: twinkle 2s infinite ease-in-out;
  will-change: transform;
  transition: transform 0.2s ease-out;
}

.star.small {
  width: 2px;
  height: 2px;
  opacity: 0.15;
}

.star.medium {
  width: 3px;
  height: 3px;
  opacity: 0.2;
}

.star.large {
  width: 4px;
  height: 4px;
  opacity: 0.25;
}

@keyframes twinkle {
  0%, 100% { opacity: 0.2; }
  50% { opacity: 0.7; }
}

@media (min-width: 769px) {
  .star { transition: transform 0.15s ease-out; }
}

@media (max-width: 768px) {
  .star { transition: transform 0.3s ease-out; }
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.7;
  transition: background-color 0.3s, color 0.3s;
}

a {
  color: var(--link-color);
  text-decoration: none;
  border-bottom: 1px dashed var(--border-color);
  transition: border-color 0.2s;
}

a:hover {
  border-bottom-style: solid;
  border-bottom-color: var(--card-hover-border);
}

/* Layout */
.container {
  max-width: 780px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  position: relative;
  z-index: 1;
}

/* Navigation */
.site-header {
  border-bottom: 1px solid var(--border-color);
  padding: 1.25rem 0;
  margin-bottom: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.site-title a {
  border-bottom: none;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.site-nav a {
  font-size: 0.9rem;
  font-weight: 500;
  opacity: 0.75;
  border-bottom: none;
  transition: opacity 0.2s;
}

.site-nav a:hover {
  opacity: 1;
}

.rss-toggle,
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  color: var(--text-color);
  cursor: pointer;
  transition: all 0.2s;
  font-size: 1rem;
}

.rss-toggle:hover,
.theme-toggle:hover {
  transform: translateY(-2px);
  border-color: var(--card-hover-border);
}

.rss-toggle {
  opacity: 1;
}

/* Home / Profile intro */
.home-intro {
  margin-bottom: 3rem;
  font-family: 'Noto Serif', 'Noto Serif Bengali', Georgia, serif;
}

.home-intro h2 {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

.home-intro p {
  opacity: 0.85;
  max-width: 600px;
}

/* Post list */
.post-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.post-entry {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 1.25rem 1.5rem;
  transition: transform 0.2s, border-color 0.2s;
}

.post-entry:hover {
  transform: translateY(-3px);
  border-color: var(--card-hover-border);
}

.post-entry a {
  border-bottom: none;
}

.post-entry-title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.post-entry-summary {
  font-size: 0.92rem;
  opacity: 0.75;
  margin-bottom: 0.5rem;
}

.post-entry-meta {
  font-size: 0.8rem;
  opacity: 0.55;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Featured post (latest) */
.featured-post {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 2rem 2.25rem;
  margin-bottom: 2.5rem;
  transition: transform 0.2s, border-color 0.2s;
}

.featured-post:hover {
  transform: translateY(-3px);
  border-color: var(--card-hover-border);
}

.featured-post a {
  border-bottom: none;
}

.featured-post-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  letter-spacing: -0.01em;
}

.featured-post-summary {
  font-size: 1rem;
  opacity: 0.75;
  margin-bottom: 0.75rem;
  line-height: 1.6;
}

.featured-post-meta {
  font-size: 0.82rem;
  opacity: 0.55;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Post grid (remaining posts) */
.post-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.post-grid-item {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 1.25rem 1.5rem;
  transition: transform 0.2s, border-color 0.2s;
}

.post-grid-item:hover {
  transform: translateY(-3px);
  border-color: var(--card-hover-border);
}

.post-grid-item a {
  border-bottom: none;
}

@media (max-width: 600px) {
  .post-grid {
    grid-template-columns: 1fr;
  }

  .featured-post {
    padding: 1.5rem;
  }

  .featured-post-title {
    font-size: 1.25rem;
  }
}

/* Tags */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
}

.tag-item a {
  display: inline-block;
  background: var(--tag-bg);
  padding: 0.3rem 0.75rem;
  border-radius: 4px;
  font-size: 0.85rem;
  border: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  transition: border-color 0.2s, transform 0.2s;
}

.tag-item a:hover {
  border-color: var(--card-hover-border);
  transform: translateY(-2px);
}

/* Single post */
.post-header {
  margin-bottom: 2rem;
}

.post-title {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.75rem;
}

.post-meta {
  font-size: 0.85rem;
  opacity: 0.6;
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.post-content {
  font-family: 'Noto Serif', 'Noto Serif Bengali', Georgia, serif;
  font-size: 1.05rem;
  line-height: 1.85;
}

.post-content h2,
.post-content h3,
.post-content h4 {
  margin: 2rem 0 1rem;
  font-weight: 600;
}

.post-content h2 {
  font-size: 1.4rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.4rem;
}

.post-content h3 {
  font-size: 1.2rem;
}

.post-content p {
  margin-bottom: 1.25rem;
  opacity: 0.88;
}

.post-content ul,
.post-content ol {
  margin: 1rem 0 1.25rem 1.5rem;
}

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

.post-content blockquote {
  border-left: 3px solid var(--border-color);
  padding: 0.5rem 1rem;
  margin: 1.25rem 0;
  background: var(--card-bg);
  border-radius: 0 6px 6px 0;
  opacity: 0.9;
}

.post-content pre {
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  margin: 1.25rem 0;
  font-size: 0.9rem;
  line-height: 1.6;
}

.post-content code {
  font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 0.88em;
}

.post-content p code,
.post-content li code {
  background: var(--code-bg);
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
  border: 1px solid var(--border-color);
}

.post-content img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  margin: 1rem 0;
}

.post-content hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 2rem 0;
}

.post-content a {
  border-bottom-color: var(--card-hover-border);
}

/* Table of Contents */
.toc {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 1rem 1.5rem;
  margin-bottom: 2rem;
}

.toc summary {
  font-weight: 600;
  cursor: pointer;
  font-size: 0.95rem;
}

.toc nav ul {
  margin-top: 0.75rem;
  padding-left: 1.25rem;
}

.toc nav li {
  margin-bottom: 0.3rem;
}

.toc nav a {
  font-size: 0.9rem;
  opacity: 0.75;
  border-bottom: none;
}

.toc nav a:hover {
  opacity: 1;
}

/* Post tags */
.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

.post-tags a {
  display: inline-block;
  background: var(--tag-bg);
  padding: 0.25rem 0.65rem;
  border-radius: 4px;
  font-size: 0.82rem;
  border: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

/* Post navigation */
.post-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
  flex-wrap: wrap;
}

.post-nav a {
  font-size: 0.9rem;
  font-weight: 500;
  border-bottom: none;
  opacity: 0.75;
  transition: opacity 0.2s;
}

.post-nav a:hover {
  opacity: 1;
}

/* Search */
.search-input {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-color);
  font-size: 1rem;
  font-family: inherit;
  margin-bottom: 1.5rem;
  transition: border-color 0.2s;
}

.search-input:focus {
  outline: none;
  border-color: var(--card-hover-border);
}

.search-input::placeholder {
  color: var(--text-color);
  opacity: 0.4;
}

/* Footer */
.site-footer {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
  text-align: center;
  font-size: 0.85rem;
  opacity: 0.55;
  padding-bottom: 2rem;
}

.site-footer a {
  border-bottom: none;
  opacity: 0.8;
}

.site-footer a:hover {
  opacity: 1;
}

/* Section heading */
.section-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-top: 2.5rem;
}

.pagination a {
  padding: 0.4rem 1rem;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border-color);
  transition: border-color 0.2s;
}

.pagination a:hover {
  border-color: var(--card-hover-border);
}

/* Taxonomy page */
.taxonomy-list {
  list-style: none;
}

.taxonomy-list li {
  margin-bottom: 0.75rem;
}

.taxonomy-list a {
  font-weight: 500;
}

.taxonomy-count {
  opacity: 0.5;
  font-size: 0.85rem;
  margin-left: 0.3rem;
}

/* Reading time / word count */
.reading-time {
  font-size: 0.8rem;
  opacity: 0.55;
}

/* Responsive */
@media (max-width: 600px) {
  .container {
    padding: 1.25rem 1rem;
  }

  .post-title {
    font-size: 1.4rem;
  }

  .site-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .post-nav {
    flex-direction: column;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* Language switcher */
.lang-switcher {
  display: inline-flex;
  align-items: center;
  gap: 0.15rem;
  font-size: 0.85rem;
  font-weight: 600;
}

.lang-switch {
  padding: 0.15rem 0.4rem;
  border: none;
  border-bottom: 1px dashed var(--border-color);
  transition: opacity 0.2s;
  opacity: 0.6;
}

.lang-switch:hover {
  opacity: 1;
  border-bottom-style: solid;
}

.lang-active {
  opacity: 1;
  font-weight: 700;
}

/* Translation notice */
.translation-notice {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-left: 3px solid #f0ad4e;
  border-radius: 0 6px 6px 0;
  padding: 0.75rem 1rem;
  margin-bottom: 2rem;
  font-size: 0.9rem;
  opacity: 0.9;
  line-height: 1.6;
}

.translation-notice a {
  font-weight: 600;
  border-bottom: 1px solid var(--card-hover-border);
}

/* Print */
@media print {
  body {
    background: #fff !important;
    color: #000 !important;
  }

  .site-nav,
  .theme-toggle,
  .search-input {
    display: none !important;
  }
}