:root {
  --primary-color: #656397;
  --primary-hover: #656397dd;
  --bg-light: #f8fafc;
  --bg-card-light: #ffffff;
  --text-light: #0f172a;
  --text-muted-light: #64748b;
  --border-light: #e2e8f0;

  --bg-dark: #0f172a;
  --bg-card-dark: #1e293b;
  --text-dark: #f8fafc;
  --text-muted-dark: #94a3b8;
  --border-dark: #334155;

  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-light);
  color: var(--text-light);
  line-height: 1.6;
  transition: var(--transition);
}

body.dark-mode {
  background-color: var(--bg-dark);
  color: var(--text-dark);
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 95%;
  margin: 0 auto;
  padding: 1.25rem 2rem;
  border-bottom: 1px solid var(--border-light);
  background-color: var(--bg-card-light);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(10px);
  background-opacity: 0.8;
  transition: var(--transition);
}

body.dark-mode nav {
  background-color: rgba(30, 41, 59, 0.8);
  border-bottom: 1px solid var(--border-dark);
}

.nav-logo {
  font-weight: 700;
  font-size: 1.4rem;
  color: var(--primary-color);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.nav-links a {
  text-decoration: none;
  color: inherit;
  font-weight: 500;
  transition: var(--transition);
}

.nav-links a:hover {
  color: var(--primary-color);
}

.theme-toggle {
  background: none;
  border: none;
  color: inherit;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 50%;
  transition: var(--transition);
  display: flex;
  align-items: center;
}

.theme-toggle:hover {
  background-color: rgba(0,0,0,0.05);
}

body.dark-mode .theme-toggle:hover {
  background-color: rgba(255,255,255,0.05);
}

/* Homepage container layout (Split sidebar) */
.homepage-container {
  max-width: 95%;
  margin: 2rem auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}
@media (min-width: 900px) {
  .homepage-container {
    grid-template-columns: 240px 1fr;
  }
}

.homepage-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  height: fit-content;
  background-color: var(--bg-card-light);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  padding: 1.5rem;
  position: sticky;
  top: 90px;
  transition: var(--transition);
}
body.dark-mode .homepage-sidebar {
  background-color: var(--bg-card-dark);
  border: 1px solid var(--border-dark);
}

.category-accordion {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.category-accordion-item {
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 0.75rem;
}
body.dark-mode .category-accordion-item {
  border-bottom: 1px solid var(--border-dark);
}
.category-accordion-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.category-summary {
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  padding: 0.5rem 0;
  font-weight: 600;
  font-size: 0.95rem;
  color: inherit;
  transition: var(--transition);
}
.category-summary::-webkit-details-marker {
  display: none;
}
.category-summary:hover {
  color: var(--primary-color);
}

.accordion-icon {
  font-size: 0.7rem;
  transition: transform 0.2s ease;
  color: var(--text-muted-light);
}
body.dark-mode .accordion-icon {
  color: var(--text-muted-dark);
}
details[open] .accordion-icon {
  transform: rotate(180deg);
}

.category-article-list {
  list-style: none;
  padding-left: 1rem;
  margin-top: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.category-article-link {
  color: var(--text-muted-light);
  text-decoration: none;
  font-size: 0.88rem;
  transition: var(--transition);
  display: block;
  padding: 0.2rem 0;
  white-space: normal;
  word-wrap: break-word;
}
body.dark-mode .category-article-link {
  color: var(--text-muted-dark);
}
.category-article-link:hover {
  color: var(--primary-color);
  padding-left: 4px;
}
.category-article-link.active {
  color: var(--primary-color);
  font-weight: 700;
  padding-left: 4px;
}
body.dark-mode .category-article-link.active {
  color: var(--primary-color);
}

main {
  max-width: 95%;
  margin: 2rem auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

/* Grid Layout for Homepage depending on selection */
.homepage-layout-modern {
  grid-template-columns: 1fr;
}
@media (min-width: 768px) {
  .homepage-layout-modern .articles-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
  }
}

/* Classic layout: Single column list with left accent border */
.homepage-layout-classic .articles-grid {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}
.homepage-layout-classic .article-card {
  border-left: 4px solid var(--primary-color);
  border-radius: 4px 12px 12px 4px;
}

/* Minimal layout: Simple row-aligned text list, compact, no cards */
.homepage-layout-minimal .articles-grid {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.homepage-layout-minimal .article-card {
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border-light);
  box-shadow: none;
  border-radius: 0;
  padding: 1.25rem 0.5rem;
  margin: 0;
  transition: var(--transition);
}
body.dark-mode .homepage-layout-minimal .article-card {
  border-bottom: 1px solid var(--border-dark);
}
.homepage-layout-minimal .article-card:hover {
  transform: translateX(6px);
  border-color: var(--primary-color);
  background: transparent;
  box-shadow: none;
}
.homepage-layout-minimal .article-card .article-summary,
.homepage-layout-minimal .article-card .read-more {
  display: none;
}
.homepage-layout-minimal .article-card .article-title {
  font-size: 1.15rem;
  margin-bottom: 0;
  font-weight: 600;
}
.homepage-layout-minimal .article-card .article-meta {
  margin-bottom: 0;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 1rem;
}
@media (max-width: 600px) {
  .homepage-layout-minimal .article-card {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    padding: 1rem 0;
  }
}

.articles-grid {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.card {
  background-color: var(--bg-card-light);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  transition: var(--transition);
  position: relative;
  display: flex;
  flex-direction: column;
}

body.dark-mode .card {
  background-color: var(--bg-card-dark);
  border: 1px solid var(--border-dark);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  border-color: var(--primary-color);
}

.article-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: inherit;
  text-decoration: none;
}

.article-title a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

.article-title a:hover {
  color: var(--primary-color);
}

.article-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted-light);
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

body.dark-mode .article-meta {
  color: var(--text-muted-dark);
}

.category-tag {
  background-color: rgba(79, 70, 229, 0.1);
  color: var(--primary-color);
  padding: 0.15rem 0.6rem;
  border-radius: 9999px;
  font-weight: 500;
  text-decoration: none;
  font-size: 0.8rem;
}

.article-summary {
  color: var(--text-muted-light);
  margin-bottom: 1.5rem;
}

body.dark-mode .article-summary {
  color: var(--text-muted-dark);
}

.read-more {
  margin-top: auto;
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: var(--transition);
}

.read-more:hover {
  color: var(--primary-hover);
  transform: translateX(4px);
}

/* Category Filters & Search */
.controls-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.search-bar {
  width: 100%;
  padding: 0.85rem 1.25rem;
  font-size: 1rem;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  background-color: var(--bg-card-light);
  color: inherit;
  font-family: inherit;
  transition: var(--transition);
}

body.dark-mode .search-bar {
  background-color: var(--bg-card-dark);
  border: 1px solid var(--border-dark);
}

.search-bar:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.25);
}

.category-badges {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.category-badge {
  text-decoration: none;
  background-color: var(--bg-card-light);
  border: 1px solid var(--border-light);
  color: inherit;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

body.dark-mode .category-badge {
  background-color: var(--bg-card-dark);
  border: 1px solid var(--border-dark);
}

.category-badge:hover, .category-badge.active {
  background-color: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

/* Article detail template layouts */
.article-detail-container {
  max-width: 95%;
  margin: 3rem auto;
  padding: 0 1.5rem;
}

.article-header {
  margin-bottom: 2.5rem;
  text-align: left;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 1.5rem;
}

body.dark-mode .article-header {
  border-bottom: 1px solid var(--border-dark);
}

.article-header h1 {
  font-size: 2.6rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
  line-height: 1.2;
  color: var(--text-light);
}

body.dark-mode .article-header h1 {
  color: var(--text-dark);
}

.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.meta-icon {
  opacity: 0.8;
  font-size: 0.95rem;
}

.article-header .category-tag {
  background-color: rgba(79, 70, 229, 0.08);
  color: var(--primary-color);
  padding: 0.2rem 0.75rem;
  border-radius: 9999px;
  font-weight: 500;
  text-decoration: none;
  font-size: 0.82rem;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  border: 1px solid rgba(79, 70, 229, 0.15);
}

.article-header .category-tag:hover {
  background-color: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
  transform: translateY(-1px);
}

.article-content {
  font-size: 1.1rem;
  line-height: 1.8;
}

.article-content p {
  margin-bottom: 1.5rem;
}

.article-content blockquote {
  border-left: 4px solid var(--primary-color);
  padding-left: 1.25rem;
  margin: 1.5rem 0;
  font-style: italic;
  color: var(--text-muted-light);
}

body.dark-mode .article-content blockquote {
  color: var(--text-muted-dark);
}

.article-content pre {
  background-color: #1e293b;
  color: #f8fafc;
  padding: 1.25rem;
  border-radius: 8px;
  overflow-x: auto;
  margin: 1.5rem 0;
}

.article-content code {
  font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.9em;
}

.article-content ul, .article-content ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

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

/* Layout options for articles */
.article-with-sidebar {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}
@media (min-width: 900px) {
  .article-with-sidebar.sidebar-right {
    grid-template-columns: 1fr 240px;
  }
  .article-with-sidebar.sidebar-left {
    grid-template-columns: 240px 1fr;
  }
}

.article-sidebar {
  background-color: var(--bg-card-light);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  padding: 1.5rem;
  height: fit-content;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  position: sticky;
  top: 90px;
  transition: var(--transition);
}

body.dark-mode .article-sidebar {
  background-color: var(--bg-card-dark);
  border: 1px solid var(--border-dark);
}

.sidebar-title {
  font-size: 1.15rem;
  font-weight: 700;
  border-bottom: 2px solid var(--border-light);
  padding-bottom: 0.5rem;
}

body.dark-mode .sidebar-title {
  border-bottom: 2px solid var(--border-dark);
}

/* Font Size Modifiers */
.font-sm { font-size: 0.95rem; }
.font-md { font-size: 1.1rem; }
.font-lg { font-size: 1.25rem; }

/* Text Alignment */
.align-left { text-align: left; }
.align-right { text-align: right; }
.align-justify { text-align: justify; }

/* About Me page styles */
.about-container {
  max-width: 95%;
  margin: 3rem auto;
  padding: 0 1.5rem;
}

.about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: center;
}
@media (min-width: 768px) {
  .about-split {
    grid-template-columns: 1fr 2fr;
  }
}

.about-avatar-wrapper {
  display: flex;
  justify-content: center;
}

.about-avatar {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--primary-color);
  box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
  transition: var(--transition);
}

.about-avatar:hover {
  transform: scale(1.05);
}

.about-content {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.about-bio {
  font-size: 1.15rem;
  line-height: 1.8;
  white-space: pre-wrap;
}

.about-single {
  text-align: center;
  max-width: 1000px;
  margin: 0 auto;
}

.about-single .about-avatar-wrapper {
  margin-bottom: 2rem;
}

.avatar-left { justify-content: flex-start; }
.avatar-center { justify-content: center; }
.avatar-right { justify-content: flex-end; }

/* Footer */
footer {
  text-align: center;
  padding: 3rem 2rem;
  border-top: 1px solid var(--border-light);
  margin-top: 5rem;
  color: var(--text-muted-light);
  background-color: var(--bg-card-light);
  transition: var(--transition);
}

body.dark-mode footer {
  background-color: var(--bg-card-dark);
  border-top: 1px solid var(--border-dark);
  color: var(--text-muted-dark);
}

footer a {
  color: var(--primary-color);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted-light);
}

body.dark-mode .empty-state {
  color: var(--text-muted-dark);
}