/* ==========================================================================
   DESIGN SYSTEM TOKENS (Obsidian Dark & Gold Theme)
   ========================================================================== */
:root {
  --color-bg-base: #0a0a0c;
  --color-bg-sidebar: #111114;
  --color-bg-card: #16161a;
  --color-bg-card-hover: #1e1e24;
  
  --color-text-primary: #f5f5f7;
  --color-text-secondary: #9a9a8c;
  --color-text-muted: #64645c;
  
  --color-gold-bright: #f3e5ab;
  --color-gold-solid: #d4af37;
  --color-gold-dark: #b8901c;
  --color-gold-glow: rgba(212, 175, 55, 0.15);
  
  --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Malgun Gothic", sans-serif;
  
  --border-radius-sm: 8px;
  --border-radius-md: 12px;
  --border-radius-lg: 16px;
  
  --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  --max-content-width: 820px;
}

/* ==========================================================================
   BASE STYLES & RESET
   ========================================================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  background-color: var(--color-bg-base);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.625;
  width: 100%;
  overflow-x: hidden;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

/* Scrollbar Customization */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--color-bg-base);
}
::-webkit-scrollbar-thumb {
  background: var(--color-text-muted);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-gold-solid);
}

/* Radial Glow Backgrounds */
.glow-bg {
  position: fixed;
  width: 40vw;
  height: 40vw;
  border-radius: 50%;
  background: radial-gradient(circle, var(--color-gold-glow) 0%, rgba(10, 10, 12, 0) 70%);
  z-index: -1;
  pointer-events: none;
  filter: blur(80px);
  opacity: 0.8;
}
.glow-1 {
  top: -10%;
  right: -10%;
}
.glow-2 {
  bottom: -15%;
  left: -10%;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ==========================================================================
   LAYOUT STRUCTURE
   ========================================================================== */
.app-layout {
  display: flex;
  min-height: 100vh;
}

.mobile-header {
  display: none;
}

/* Sidebar Styling */
.sidebar {
  width: 320px;
  background-color: var(--color-bg-sidebar);
  border-right: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  flex-direction: column;
  padding: 2.5rem 1.75rem;
  position: fixed;
  height: 100vh;
  left: 0;
  top: 0;
  z-index: 100;
  overflow-y: auto;
}

.sidebar-top {
  margin-bottom: 2.5rem;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.logo-img {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.logo-text {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 300;
  letter-spacing: -0.5px;
  color: var(--color-text-primary);
}

.logo-text span {
  font-weight: 700;
}

.logo-badge {
  background: linear-gradient(135deg, var(--color-gold-solid), var(--color-gold-dark));
  color: #000;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.65rem;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  letter-spacing: 0.5px;
}

.sidebar-tagline {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.4;
}

/* Sidebar navigation */
.sidebar-nav {
  margin-bottom: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.nav-title {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.nav-link-sub {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  padding: 0.5rem 0.75rem;
  border-radius: var(--border-radius-sm);
  display: flex;
  align-items: center;
  transition: var(--transition-smooth);
  border: 1px solid transparent;
}

.nav-link-sub:hover {
  background-color: rgba(255, 255, 255, 0.03);
  color: var(--color-gold-bright);
  border: 1px solid rgba(212, 175, 55, 0.15);
  transform: translateX(3px);
}

.sidebar-section {
  margin-bottom: 2rem;
}

.sidebar-section-title {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--color-text-muted);
  display: block;
  margin-bottom: 0.75rem;
}

/* Search Box */
.search-box {
  position: relative;
  width: 100%;
}

.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
}

#search-input {
  width: 100%;
  background-color: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--border-radius-sm);
  padding: 0.7rem 1rem 0.7rem 2.2rem;
  color: var(--color-text-primary);
  font-size: 0.85rem;
  font-family: var(--font-body);
  transition: var(--transition-smooth);
}

#search-input:focus {
  outline: none;
  border-color: var(--color-gold-solid);
  box-shadow: 0 0 10px rgba(212, 175, 55, 0.1);
  background-color: rgba(255, 255, 255, 0.05);
}

/* Categories List */
.category-list {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.category-btn {
  background: none;
  border: none;
  text-align: left;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  padding: 0.5rem 0.75rem;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition-smooth);
}

.category-btn:hover {
  background-color: rgba(255, 255, 255, 0.02);
  color: var(--color-text-primary);
}

.category-btn.active {
  background-color: var(--color-gold-glow);
  color: var(--color-gold-bright);
  font-weight: 600;
  border-left: 3px solid var(--color-gold-solid);
}

.category-count {
  font-size: 0.75rem;
  background-color: rgba(255, 255, 255, 0.05);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  color: var(--color-text-secondary);
}

.category-btn.active .category-count {
  background-color: rgba(212, 175, 55, 0.2);
  color: var(--color-gold-bright);
}

/* Tag Cloud */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag-btn {
  background-color: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--color-text-secondary);
  font-size: 0.75rem;
  padding: 0.25rem 0.6rem;
  border-radius: 20px;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.tag-btn:hover {
  border-color: rgba(212, 175, 55, 0.3);
  color: var(--color-text-primary);
}

.tag-btn.active {
  background-color: var(--color-gold-solid);
  border-color: var(--color-gold-solid);
  color: #000;
  font-weight: 600;
}

.sidebar-footer {
  margin-top: auto;
  padding-top: 2rem;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* Main Content Wrapper */
.main-content {
  margin-left: 320px;
  flex-grow: 1;
  padding: 3.5rem 4rem;
  max-width: calc(100vw - 320px);
}

.view-container {
  max-width: var(--max-content-width);
  margin: 0 auto;
  width: 100%;
}

.view {
  animation: fadeIn 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.view.hidden {
  display: none !important;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.view-header {
  margin-bottom: 3.5rem;
}

.view-title {
  font-family: var(--font-display);
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.75px;
  margin-bottom: 0.5rem;
}

.view-subtitle {
  color: var(--color-text-secondary);
  font-size: 1.05rem;
}

/* ==========================================================================
   POSTS GRID & CARDS
   ========================================================================== */
.posts-grid {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.post-card {
  background-color: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: var(--border-radius-md);
  padding: 1.75rem;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: var(--transition-smooth);
}

.post-card:hover {
  transform: translateY(-2px);
  border-color: rgba(212, 175, 55, 0.25);
  background-color: var(--color-bg-card-hover);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.post-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--color-gold-solid), var(--color-gold-dark));
  opacity: 0;
  transition: var(--transition-smooth);
}

.post-card:hover::before {
  opacity: 1;
}

.card-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
  align-items: center;
}

.card-category {
  color: var(--color-gold-solid);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.card-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  line-height: 1.35;
  margin-bottom: 0.75rem;
  transition: var(--transition-smooth);
}

.post-card:hover .card-title {
  color: var(--color-gold-bright);
}

.card-summary {
  color: var(--color-text-secondary);
  font-size: 0.92rem;
  line-height: 1.5;
  margin-bottom: 1rem;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.card-tag {
  background-color: rgba(255, 255, 255, 0.03);
  color: var(--color-text-muted);
  font-size: 0.7rem;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}

.loading-spinner {
  border: 3px solid rgba(255, 255, 255, 0.05);
  border-top: 3px solid var(--color-gold-solid);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin: 4rem auto;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* ==========================================================================
   POST READING VIEW
   ========================================================================== */
.read-navigation {
  margin-bottom: 2rem;
}

.btn-back {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  transition: var(--transition-smooth);
}

.btn-back:hover {
  color: var(--color-gold-solid);
  transform: translateX(-3px);
}

.post-article {
  background-color: transparent;
}

.post-header {
  margin-bottom: 2.25rem;
}

.post-meta-top {
  display: flex;
  gap: 1rem;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.75rem;
  align-items: center;
}

.post-category {
  color: var(--color-gold-solid);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.post-date {
  color: var(--color-text-muted);
}

.post-article .post-title {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.75px;
  color: var(--color-text-primary);
  margin-bottom: 1.25rem;
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.post-tag {
  background-color: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--color-text-secondary);
  font-size: 0.75rem;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
}

.post-divider {
  border: none;
  height: 1px;
  background-color: rgba(255, 255, 255, 0.08);
  margin: 2.5rem 0;
}

/* Minimal Project Links Footer */
.post-footer-minimal {
  padding: 1.5rem 0;
  margin-top: 3.5rem;
  text-align: center;
  font-size: 0.88rem;
  color: var(--color-text-muted);
  border-top: 1px dashed rgba(255, 255, 255, 0.05);
}

.post-footer-minimal a {
  color: var(--color-text-secondary);
  text-decoration: underline;
  margin: 0 0.5rem;
  transition: var(--transition-smooth);
}

.post-footer-minimal a:hover {
  color: var(--color-gold-solid);
}

.banner-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 500;
  border-radius: var(--border-radius-sm);
  transition: var(--transition-smooth);
  cursor: pointer;
}

.btn-gold-outline {
  background-color: rgba(255,255,255,0.02);
  border: 1px solid rgba(212, 175, 55, 0.3);
  color: var(--color-gold-bright);
}

.btn-gold-outline:hover {
  background-color: var(--color-gold-solid);
  border-color: var(--color-gold-solid);
  color: #000;
  font-weight: 600;
}

.btn-sm {
  font-size: 0.8rem;
  padding: 0.45rem 0.85rem;
}

/* ==========================================================================
   MARKDOWN PARSED ARTICLE CONTENT TYPOGRAPHY
   ========================================================================== */
.markdown-body {
  font-size: 1.05rem;
  line-height: 1.75;
  color: #e1e1e6;
}

.markdown-body p {
  margin-bottom: 1.5rem;
}

.markdown-body h2 {
  font-family: var(--font-display);
  font-size: 1.65rem;
  font-weight: 700;
  margin: 2.75rem 0 1.25rem 0;
  color: var(--color-text-primary);
  letter-spacing: -0.5px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  padding-bottom: 0.4rem;
}

.markdown-body h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 600;
  margin: 2rem 0 1rem 0;
  color: var(--color-gold-bright);
}

.markdown-body ul, .markdown-body ol {
  margin-bottom: 1.5rem;
  padding-left: 1.75rem;
}

.markdown-body li {
  margin-bottom: 0.5rem;
}

.markdown-body blockquote {
  border-left: 4px solid var(--color-gold-solid);
  background-color: rgba(255, 255, 255, 0.02);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
}

.markdown-body blockquote p {
  margin-bottom: 0;
  font-style: italic;
  color: var(--color-text-secondary);
}

/* Tables */
.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  font-size: 0.95rem;
}

.markdown-body th {
  background-color: rgba(255, 255, 255, 0.03);
  border-bottom: 2px solid rgba(212, 175, 55, 0.3);
  color: var(--color-gold-bright);
  font-weight: 600;
  padding: 0.75rem 1rem;
  text-align: left;
}

.markdown-body td {
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  padding: 0.75rem 1rem;
  color: var(--color-text-secondary);
}

.markdown-body tr:hover td {
  color: var(--color-text-primary);
  background-color: rgba(255,255,255,0.01);
}

/* KaTeX Overflow prevention */
.katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.5rem 0;
}

/* Code Syntax Styling overrides */
.markdown-body pre {
  margin: 1.5rem 0 !important;
  border-radius: var(--border-radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.05) !important;
  position: relative; /* Enabled absolute positioning for copy button */
}

/* Code Copy Button */
.copy-code-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background-color: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--color-text-secondary);
  font-size: 0.72rem;
  font-family: var(--font-body);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
  z-index: 10;
}

.markdown-body pre:hover .copy-code-btn {
  opacity: 1;
}

.copy-code-btn:hover {
  background-color: var(--color-gold-solid);
  border-color: var(--color-gold-solid);
  color: #000;
  font-weight: 600;
}

.markdown-body code {
  font-family: 'Fira Code', Consolas, Monaco, monospace;
  font-size: 0.88em;
  background-color: rgba(255, 255, 255, 0.06);
  color: var(--color-gold-bright);
  padding: 0.15rem 0.35rem;
  border-radius: 4px;
}

.markdown-body pre code {
  background-color: transparent !important;
  color: inherit;
  padding: 0;
  border-radius: 0;
}

.markdown-body img {
  max-width: 100%;
  height: auto;
  border-radius: var(--border-radius-md);
  border: 1px solid rgba(255, 255, 255, 0.08);
  margin: 1.5rem 0;
}

/* ==========================================================================
   RESPONSIVE DESIGN (Mobile Adjustments)
   ========================================================================== */
@media (max-width: 1024px) {
  .sidebar {
    width: 280px;
    transform: translateX(-280px);
    transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  }
  
  .sidebar.active {
    transform: translateX(0);
  }
  
  .main-content {
    margin-left: 0;
    max-width: 100vw;
    padding: 5.5rem 1.5rem 3rem 1.5rem;
  }
  
  .mobile-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
    background-color: var(--color-bg-sidebar);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 99;
    padding: 0 1.25rem;
  }
  
  .mobile-logo-text {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 300;
    color: var(--color-text-primary);
  }
  
  .mobile-logo-text span {
    font-weight: 700;
  }
  
  .icon-btn {
    background: none;
    border: none;
    color: var(--color-text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 98;
  }
  
  .sidebar.active + .sidebar-overlay {
    display: block;
  }
  
  .view-title {
    font-size: 1.85rem;
  }
  
  .post-article .post-title {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  .post-card {
    padding: 1.25rem;
  }
  .card-title {
    font-size: 1.15rem;
  }
  .post-article .post-title {
    font-size: 1.65rem;
  }
  .markdown-body {
    font-size: 1rem;
  }
  .post-footer-banner {
    padding: 1.25rem;
  }
}