/* ========== 1. Catppuccin Mocha Palette ========== */
:root {
  --ctp-rosewater: #f5e0dc;
  --ctp-flamingo: #f2cdcd;
  --ctp-pink: #f5c2e7;
  --ctp-mauve: #cba6f7;
  --ctp-red: #f38ba8;
  --ctp-maroon: #eba0ac;
  --ctp-peach: #fab387;
  --ctp-yellow: #f9e2af;
  --ctp-green: #a6e3a1;
  --ctp-teal: #94e2d5;
  --ctp-sky: #89dceb;
  --ctp-sapphire: #74c7ec;
  --ctp-blue: #89b4fa;
  --ctp-lavender: #b4befe;
  --ctp-text: #cdd6f4;
  --ctp-subtext1: #bac2de;
  --ctp-subtext0: #a6adc8;
  --ctp-overlay2: #9399b2;
  --ctp-overlay1: #7f849c;
  --ctp-overlay0: #6c7086;
  --ctp-surface2: #585b70;
  --ctp-surface1: #45475a;
  --ctp-surface0: #313244;
  --ctp-base: #1e1e2e;
  --ctp-mantle: #181825;
  --ctp-crust: #11111b;

  /* Semantic tokens */
  --bg: var(--ctp-base);
  --bg-secondary: var(--ctp-mantle);
  --bg-tertiary: var(--ctp-crust);
  --bg-elevated: var(--ctp-surface0);
  --text: var(--ctp-text);
  --text-secondary: var(--ctp-subtext1);
  --text-muted: var(--ctp-overlay1);
  --accent: var(--ctp-blue);
  --accent-hover: var(--ctp-sapphire);
  --border: var(--ctp-surface0);
  --heading: var(--ctp-lavender);
}

/* ========== 2. Reset & Base ========== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

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

/* ========== 3. Typography ========== */
h1, h2, h3, h4, h5, h6 {
  color: var(--heading);
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 0.5em;
}

h1 { font-size: 2.2rem; }
h2 { font-size: 1.7rem; }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.15rem; }
h5 { font-size: 1rem; }
h6 { font-size: 0.9rem; }

p {
  margin-bottom: 1.2em;
}

code, pre {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

code {
  font-size: 0.875em;
  padding: 0.15em 0.4em;
  background: var(--bg-elevated);
  border-radius: 4px;
  color: var(--ctp-peach);
}

pre {
  overflow-x: auto;
  padding: 1.2em;
  border-radius: 8px;
  background: var(--ctp-mantle) !important;
  border: 1px solid var(--border);
  margin-bottom: 1.5em;
}

pre code {
  padding: 0;
  background: none;
  color: inherit;
  font-size: 0.85em;
}

blockquote {
  border-left: 3px solid var(--ctp-mauve);
  padding: 0.8em 1.2em;
  margin: 1.5em 0;
  background: var(--bg-elevated);
  border-radius: 0 8px 8px 0;
  color: var(--text-secondary);
}

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

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2em 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5em;
  overflow-x: auto;
  display: block;
}

th, td {
  padding: 0.75em 1em;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  background: var(--bg-elevated);
  color: var(--heading);
  font-weight: 600;
}

tr:hover td {
  background: rgba(49, 50, 68, 0.5);
}

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

li {
  margin-bottom: 0.3em;
}

/* ========== 4. Layout ========== */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.content-grid {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 3rem;
  align-items: start;
}

.site-main {
  min-height: calc(100vh - 200px);
  padding-top: 2rem;
  padding-bottom: 3rem;
}

/* ========== 5. Navigation ========== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

.navbar.scrolled {
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-brand {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}

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

.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-link {
  color: var(--text-secondary);
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  text-transform: capitalize;
  transition: color 0.2s ease, background 0.2s ease;
  display: flex;
  align-items: center;
}

.nav-link:hover {
  color: var(--text);
  background: var(--bg-elevated);
}

.nav-link svg {
  opacity: 0.8;
}

.nav-link:hover svg {
  opacity: 1;
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  z-index: 10;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ========== 6. Hero / Header ========== */
.hero {
  position: relative;
  height: 45vh;
  min-height: 300px;
  max-height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-size: cover;
  background-position: center;
  margin-top: 60px;
  overflow: hidden;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(17, 17, 27, 0.7) 0%,
    rgba(30, 30, 46, 0.85) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 2rem;
}

.hero-content h1 {
  font-size: 3rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.3em;
  letter-spacing: -0.03em;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  font-weight: 400;
}

/* Post-specific hero */
.hero-post {
  height: 50vh;
  max-height: 550px;
}

.hero-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-top: 1rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.hero-tags {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  margin-top: 0.75rem;
}

.hero-tags a {
  color: var(--ctp-teal);
  font-size: 0.85rem;
  padding: 0.2em 0.6em;
  border: 1px solid var(--ctp-surface2);
  border-radius: 4px;
  transition: all 0.2s ease;
}

.hero-tags a:hover {
  background: var(--ctp-surface0);
  border-color: var(--ctp-teal);
}

/* ========== 7. Post List ========== */
.post-list {
  display: flex;
  flex-direction: column;
}

.post-preview {
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--border);
}

.post-preview:first-child {
  padding-top: 0;
}

.post-preview-link {
  display: block;
}

.post-preview-title {
  font-size: 1.5rem;
  color: var(--text);
  transition: color 0.2s ease;
  margin-bottom: 0.2em;
}

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

.post-preview-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  font-weight: 400;
  margin-bottom: 0.5em;
}

.post-preview-excerpt {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 0.75em;
}

.post-preview-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.85rem;
  color: var(--ctp-overlay0);
}

.post-author {
  color: var(--ctp-peach);
}

.post-tag {
  color: var(--ctp-mauve);
  font-size: 0.8rem;
  padding: 0.1em 0.5em;
  border: 1px solid var(--ctp-surface1);
  border-radius: 4px;
  transition: all 0.2s ease;
}

.post-tag:hover {
  background: var(--ctp-surface0);
  border-color: var(--ctp-mauve);
  color: var(--ctp-mauve);
}

/* ========== 8. Pagination ========== */
.pagination {
  display: flex;
  justify-content: space-between;
  padding: 2rem 0 0;
}

.pagination-link {
  padding: 0.6rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: all 0.2s ease;
}

.pagination-link:hover {
  background: var(--bg-elevated);
  color: var(--accent);
  border-color: var(--accent);
}

/* ========== 9. Single Post ========== */
.post-container {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.post-content {
  font-size: 1.05rem;
  line-height: 1.8;
}

.post-content h2 {
  margin-top: 2.5em;
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--border);
}

.post-content h3 {
  margin-top: 2em;
}

.post-content img {
  border-radius: 8px;
  margin: 1.5em 0;
}

.post-content figure {
  margin: 1.5em 0;
}

.post-content figcaption {
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 0.5em;
}

.post-content a {
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* Post navigation */
.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.post-nav-item {
  padding: 1rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: all 0.2s ease;
}

.post-nav-item:hover {
  background: var(--bg-elevated);
  border-color: var(--accent);
}

.post-nav-label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.3em;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.post-nav-title {
  color: var(--text);
  font-weight: 500;
}

.post-nav-item.next {
  text-align: right;
}

/* TOC (Table of Contents) */
.toc-wrapper {
  position: fixed;
  top: 80px;
  right: max(calc((100vw - 1100px) / 2 - 220px), 20px);
  width: 200px;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
}

.toc {
  padding: 1rem;
  border-left: 2px solid var(--border);
}

.toc-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.toc ul {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.toc li {
  margin-bottom: 0.4em;
}

.toc a {
  font-size: 0.82rem;
  color: var(--text-muted);
  transition: color 0.2s ease;
  display: block;
  padding: 0.15em 0;
}

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

.toc ul ul {
  padding-left: 0.75em;
}

/* ========== 10. Sidebar ========== */
.sidebar {
  position: sticky;
  top: 80px;
}

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

.sidebar-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.3em 0.75em;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  transition: all 0.2s ease;
}

.tag-pill:hover {
  background: var(--ctp-surface1);
  color: var(--accent);
  border-color: var(--accent);
}

.tag-count {
  font-size: 0.7rem;
  color: var(--text-muted);
  background: var(--ctp-surface1);
  padding: 0.1em 0.45em;
  border-radius: 10px;
}

/* ========== 11. Archive ========== */
.archive-list {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.archive-year {
  font-size: 1.8rem;
  color: var(--accent);
  font-weight: 700;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.3em;
  border-bottom: 2px solid var(--border);
}

.archive-year:first-child {
  margin-top: 0;
}

.archive-item {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid rgba(49, 50, 68, 0.4);
}

.archive-date {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-shrink: 0;
  min-width: 5em;
}

.archive-title {
  color: var(--text);
  font-weight: 500;
  transition: color 0.2s ease;
}

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

/* ========== 12. Search ========== */
.search-container {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Algolia dark overrides */
.ais-search-box {
  max-width: 100%;
  margin-bottom: 1.5rem;
}

.ais-search-box--input {
  background: var(--bg-elevated) !important;
  color: var(--text) !important;
  border: 1px solid var(--border) !important;
  border-radius: 8px !important;
  padding: 0.75rem 1rem !important;
  font-family: 'Inter', sans-serif !important;
}

.ais-search-box--input:focus {
  border-color: var(--accent) !important;
  outline: none !important;
  box-shadow: 0 0 0 3px rgba(137, 180, 250, 0.15) !important;
}

.ais-search-box--magnifier-icon,
.ais-search-box--reset-icon {
  fill: var(--text-muted) !important;
}

.post-item {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.post-item .post-meta {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.post-item h2 {
  margin: 0.3em 0;
}

.post-item .post-link {
  color: var(--text);
}

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

.post-breadcrumbs {
  color: var(--text-muted) !important;
  font-size: 0.85rem;
}

.post-breadcrumb {
  color: var(--text-muted) !important;
}

.post-snippet {
  color: var(--text-secondary);
  margin-top: 0.5em;
}

.post-snippet .ais-highlight {
  color: var(--accent) !important;
  font-weight: 600;
}

.post-link .ais-highlight {
  color: var(--accent) !important;
  text-decoration: underline;
}

/* ========== 13. Comments ========== */
.comments-section {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

/* ========== 14. Footer ========== */
.site-footer {
  background: var(--bg-tertiary);
  border-top: 1px solid var(--border);
  padding: 2.5rem 0;
  margin-top: 3rem;
}

.footer-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
  text-align: center;
}

.footer-social {
  display: flex;
  justify-content: center;
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.social-icon {
  color: var(--text-muted);
  transition: color 0.2s ease, transform 0.2s ease;
  display: flex;
  align-items: center;
}

.social-icon:hover {
  color: var(--accent);
  transform: translateY(-2px);
}

.footer-copyright {
  font-size: 0.85rem;
  color: var(--ctp-overlay0);
}

.footer-copyright a {
  color: var(--text-muted);
}

.footer-copyright a:hover {
  color: var(--accent);
}

/* ========== 15. 404 ========== */
.page-404 {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  text-align: center;
  padding: 2rem;
}

.page-404 h1 {
  font-size: 6rem;
  color: var(--ctp-surface2);
  font-weight: 800;
  line-height: 1;
  margin-bottom: 0.2em;
}

.page-404 p {
  font-size: 1.2rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.page-404 a {
  padding: 0.7rem 1.5rem;
  background: var(--accent);
  color: var(--bg);
  border-radius: 8px;
  font-weight: 600;
  transition: background 0.2s ease;
}

.page-404 a:hover {
  background: var(--accent-hover);
  color: var(--bg);
}

/* ========== 16. Page (About, etc.) ========== */
.page-content {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.page-content h1:first-child {
  margin-bottom: 1em;
}

/* ========== 17. Taxonomy ========== */
.taxonomy-header {
  text-align: center;
  margin-bottom: 2rem;
}

.taxonomy-title {
  font-size: 2rem;
  color: var(--accent);
}

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

/* ========== 18. Responsive ========== */
@media (max-width: 1300px) {
  .toc-wrapper {
    display: none;
  }
}

@media (max-width: 768px) {
  body {
    font-size: 15px;
  }

  .content-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .hero-content h1 {
    font-size: 2rem;
  }

  .hero {
    height: 35vh;
    min-height: 220px;
  }

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

  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 1rem;
    gap: 0.25rem;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s ease, opacity 0.3s ease;
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-link {
    padding: 0.75rem 1rem;
    width: 100%;
  }

  .post-nav {
    grid-template-columns: 1fr;
  }

  .archive-item {
    flex-direction: column;
    gap: 0.25rem;
  }

  .sidebar {
    position: static;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 1rem;
  }

  .hero-content h1 {
    font-size: 1.6rem;
  }

  h1 { font-size: 1.7rem; }
  h2 { font-size: 1.4rem; }
  h3 { font-size: 1.15rem; }
}

/* ========== 19. Animations ========== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.site-main {
  animation: fadeIn 0.4s ease;
}

/* Focus styles for accessibility */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Selection color */
::selection {
  background: rgba(137, 180, 250, 0.3);
  color: var(--text);
}

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

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

::-webkit-scrollbar-thumb {
  background: var(--ctp-surface1);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--ctp-surface2);
}