/* =========================
   CSS Custom Properties
   ========================= */

:root {
  /* Colors - warm, editorial palette */
  --color-bg: #faf9f7;
  --color-bg-subtle: #f5f3f0;
  --color-text: #1a1a1a;
  --color-text-muted: #666;
  --color-accent: #c45d3a;
  --color-accent-hover: #a34a2d;
  --color-border: #e8e6e3;
  --color-border-hover: #d4d1cc;
  --color-code-bg: #2d2a2e;
  --color-selection: rgba(196, 93, 58, 0.15);

  /* Typography */
  --font-serif: 'Newsreader', Georgia, 'Times New Roman', serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, monospace;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-medium: 250ms ease;
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Layout */
  --container-width: 680px;
  --container-padding: clamp(1.25rem, 5vw, 2rem);
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #1a1a1a;
    --color-bg-subtle: #242424;
    --color-text: #e8e6e3;
    --color-text-muted: #999;
    --color-accent: #e07a5f;
    --color-accent-hover: #f08c71;
    --color-border: #333;
    --color-border-hover: #444;
    --color-code-bg: #0d0d0d;
    --color-selection: rgba(224, 122, 95, 0.2);
  }
}


/* =========================
   View Transitions API
   ========================= */

@view-transition {
  navigation: auto;
}

::view-transition-old(root) {
  animation: fade-out 200ms ease-out forwards;
}

::view-transition-new(root) {
  animation: fade-in 300ms ease-out forwards;
}

::view-transition-old(page-content) {
  animation: slide-out-left 250ms ease-out forwards;
}

::view-transition-new(page-content) {
  animation: slide-in-right 300ms ease-out forwards;
}

@keyframes fade-out {
  from { opacity: 1; }
  to { opacity: 0; }
}

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slide-out-left {
  from { 
    opacity: 1; 
    transform: translateX(0); 
  }
  to { 
    opacity: 0; 
    transform: translateX(-20px); 
  }
}

@keyframes slide-in-right {
  from { 
    opacity: 0; 
    transform: translateX(20px); 
  }
  to { 
    opacity: 1; 
    transform: translateX(0); 
  }
}


/* =========================
   Base Reset & Defaults
   ========================= */

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  line-height: 1.7;
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: var(--color-selection);
}

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


/* =========================
   Loading Indicator
   ========================= */

#loading-indicator {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 9999;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

#loading-indicator.active {
  opacity: 1;
}

.loading-bar {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-hover));
  transition: width 300ms ease-out;
}

#loading-indicator.active .loading-bar {
  animation: loading-progress 1.5s ease-out forwards;
}

@keyframes loading-progress {
  0% { width: 0; }
  20% { width: 30%; }
  50% { width: 60%; }
  80% { width: 85%; }
  100% { width: 95%; }
}


/* =========================
   Page Wrapper & Transitions
   ========================= */

#page-wrapper {
  view-transition-name: page-content;
  min-height: 100vh;
}


/* =========================
   Layout
   ========================= */

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--space-3xl) var(--container-padding);
}

/* Page entrance animations */
.container[data-page] {
  animation: page-enter 500ms ease-out forwards;
}

@keyframes page-enter {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}


/* =========================
   Site Header
   ========================= */

.site-header {
  margin-bottom: var(--space-xl);
}

.site-title {
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 5vw, 2.25rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 var(--space-lg) 0;
  animation: title-enter 600ms ease-out forwards;
}

@keyframes title-enter {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}


/* =========================
   Social Links
   ========================= */

.social-links {
  display: flex;
  gap: var(--space-md);
  animation: fade-in 600ms ease-out 100ms backwards;
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  
  border: 1px solid var(--color-border);
  border-radius: 4px;
  
  transition: 
    color var(--transition-fast),
    border-color var(--transition-fast),
    background-color var(--transition-fast),
    transform var(--transition-fast);
}

.social-link:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background-color: var(--color-bg-subtle);
  transform: translateY(-1px);
  text-decoration: none;
}

.social-link svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
  flex-shrink: 0;
}

.social-link span {
  display: none;
}

@media (min-width: 400px) {
  .social-link span {
    display: inline;
  }
}


/* =========================
   Posts Section
   ========================= */

.posts-section {
  animation: fade-in 600ms ease-out 200ms backwards;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-text-muted);
  margin: 0 0 var(--space-lg) 0;
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}


/* =========================
   Post Preview Card
   ========================= */

.post-preview {
  margin-bottom: var(--space-lg);
}

.preview-link {
  display: block;
  padding: var(--space-xl);
  
  text-decoration: none;
  color: inherit;
  
  border: 1px solid var(--color-border);
  border-radius: 8px;
  
  transition: 
    border-color var(--transition-medium),
    background-color var(--transition-medium),
    transform var(--transition-medium),
    box-shadow var(--transition-medium);
}

.preview-link:hover {
  border-color: var(--color-border-hover);
  background-color: var(--color-bg-subtle);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  text-decoration: none;
}

.preview-meta {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.preview-title {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.3;
  margin: 0 0 var(--space-md) 0;
  transition: color var(--transition-fast);
}

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

.preview-excerpt {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  line-height: 1.6;
  
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.read-more {
  display: inline-block;
  margin-top: var(--space-md);
  
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-accent);
  
  transition: transform var(--transition-fast);
}

.preview-link:hover .read-more {
  transform: translateX(4px);
}


/* =========================
   Site Footer
   ========================= */

.site-footer {
  margin-top: var(--space-3xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
  animation: fade-in 600ms ease-out 400ms backwards;
}

.site-footer p {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
}


/* =========================
   Post Page Styles
   ========================= */

.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  
  margin-bottom: var(--space-xl);
  padding: var(--space-sm) 0;
  
  transition: color var(--transition-fast);
}

.back-link:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.back-link::before {
  content: '←';
  transition: transform var(--transition-fast);
}

.back-link:hover::before {
  transform: translateX(-3px);
}

.post-header {
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-border);
}

.post-title {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin: 0 0 var(--space-lg) 0;
}

.post-github-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  
  transition: 
    color var(--transition-fast),
    border-color var(--transition-fast),
    background-color var(--transition-fast);
}

.post-github-link:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background-color: var(--color-bg-subtle);
  text-decoration: none;
}

.post-github-link svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}


/* =========================
   Post Content
   ========================= */

.post-content {
  animation: content-enter 500ms ease-out 150ms backwards;
}

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

.post-content h1,
.post-content h2,
.post-content h3 {
  font-family: var(--font-mono);
  font-weight: 600;
  line-height: 1.3;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
}

.post-content h2 {
  font-size: 1.375rem;
}

.post-content h3 {
  font-size: 1.125rem;
}

.post-content p {
  margin: var(--space-md) 0;
}

.post-content a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition-fast);
}

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

/* Inline links with reference numbers */
.post-content a[href^="http"]::after {
  content: '↗';
  font-size: 0.75em;
  margin-left: 0.1em;
  vertical-align: super;
}

.post-content a[href^="#"]::after,
.post-content a[href$=".html"]::after {
  content: none;
}


/* =========================
   Code Blocks
   ========================= */

pre {
  background: var(--color-code-bg);
  padding: var(--space-lg) var(--space-xl);
  margin: var(--space-xl) 0;
  overflow-x: auto;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.05);
  
  /* Subtle shadow for depth */
  box-shadow: 
    0 2px 8px rgba(0, 0, 0, 0.08),
    inset 0 1px 0 rgba(255, 255, 255, 0.03);
}

pre code {
  background: none;
  padding: 0;
  border-radius: 0;
  font-size: 0.875rem;
  border: none;
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-bg-subtle);
  padding: 0.15em 0.4em;
  border-radius: 3px;
  border: 1px solid var(--color-border);
}


/* =========================
   Figures & Images
   ========================= */

.post-figure {
  margin: var(--space-2xl) 0;
  padding: var(--space-lg);
  background: var(--color-bg-subtle);
  border-radius: 8px;
  text-align: center;
}

.post-figure img {
  border-radius: 6px;
  margin: 0 auto;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
  cursor: zoom-in;
  transition: transform var(--transition-fast);
}

.post-figure img:hover {
  transform: scale(1.01);
}

.post-figure figcaption {
  margin-top: var(--space-md);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}


/* =========================
   Responsive Adjustments
   ========================= */

@media (max-width: 600px) {
  .container {
    padding-top: var(--space-2xl);
    padding-bottom: var(--space-2xl);
  }
  
  pre {
    padding: var(--space-md);
    margin-left: calc(-1 * var(--container-padding));
    margin-right: calc(-1 * var(--container-padding));
    border-radius: 0;
    border-left: none;
    border-right: none;
  }
  
  .post-figure {
    margin-left: calc(-1 * var(--container-padding));
    margin-right: calc(-1 * var(--container-padding));
    padding: var(--space-md);
    border-radius: 0;
  }
}


/* =========================
   Prism.js Overrides (Okaidia theme)
   ========================= */

code[class*="language-"],
pre[class*="language-"] {
  color: #f8f8f2;
  background: none;
  text-shadow: 0 1px rgba(0, 0, 0, 0.3);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  text-align: left;
  white-space: pre;
  word-spacing: normal;
  word-break: normal;
  word-wrap: normal;
  line-height: 1.6;
  tab-size: 2;
  hyphens: none;
}

pre[class*="language-"] {
  padding: var(--space-lg) var(--space-xl);
  margin: var(--space-xl) 0;
  overflow: auto;
  border-radius: 8px;
  background: var(--color-code-bg);
}

:not(pre) > code[class*="language-"] {
  padding: 0.15em 0.4em;
  border-radius: 3px;
  white-space: normal;
  background: var(--color-bg-subtle);
  color: var(--color-text);
}

.token.comment,
.token.prolog,
.token.doctype,
.token.cdata {
  color: #8292a2;
}

.token.punctuation {
  color: #f8f8f2;
}

.token.namespace {
  opacity: .7;
}

.token.property,
.token.tag,
.token.constant,
.token.symbol,
.token.deleted {
  color: #f92672;
}

.token.boolean,
.token.number {
  color: #ae81ff;
}

.token.selector,
.token.attr-name,
.token.string,
.token.char,
.token.builtin,
.token.inserted {
  color: #a6e22e;
}

.token.operator,
.token.entity,
.token.url,
.language-css .token.string,
.style .token.string,
.token.variable {
  color: #f8f8f2;
}

.token.atrule,
.token.attr-value,
.token.function,
.token.class-name {
  color: #e6db74;
}

.token.keyword {
  color: #66d9ef;
}

.token.regex,
.token.important {
  color: #fd971f;
}

.token.important,
.token.bold {
  font-weight: bold;
}

.token.italic {
  font-style: italic;
}

.token.entity {
  cursor: help;
}


/* =========================
   Reading Progress Bar
   ========================= */

#reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  z-index: 9998;
  transition: width 50ms ease-out;
  pointer-events: none;
}


/* =========================
   Code Block Copy Button
   ========================= */

pre {
  position: relative;
}

.copy-button {
  position: absolute;
  top: var(--space-sm);
  right: var(--space-sm);
  
  padding: var(--space-xs) var(--space-sm);
  
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  color: #999;
  
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 4px;
  cursor: pointer;
  
  opacity: 0;
  transition: 
    opacity var(--transition-fast),
    background-color var(--transition-fast),
    color var(--transition-fast);
}

pre:hover .copy-button {
  opacity: 1;
}

.copy-button:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
}

.copy-button.copied {
  color: #a6e22e;
  border-color: #a6e22e;
}


/* =========================
   Heading Anchor Links
   ========================= */

.post-content h2,
.post-content h3 {
  position: relative;
}

.heading-anchor {
  position: absolute;
  left: -1.5em;
  top: 50%;
  transform: translateY(-50%);
  
  padding: var(--space-xs);
  
  font-size: 0.875em;
  color: var(--color-text-muted);
  text-decoration: none;
  
  opacity: 0;
  transition: opacity var(--transition-fast), color var(--transition-fast);
}

.post-content h2:hover .heading-anchor,
.post-content h3:hover .heading-anchor,
.heading-anchor:focus {
  opacity: 1;
}

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

.heading-anchor.copied {
  color: #a6e22e;
}

/* Hide anchor on mobile (not enough space) */
@media (max-width: 600px) {
  .heading-anchor {
    display: none;
  }
}


/* =========================
   Reading Time
   ========================= */

.reading-time {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-top: var(--space-md);
}


/* =========================
   Scroll to Top Button
   ========================= */

#scroll-to-top {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  
  width: 44px;
  height: 44px;
  
  display: flex;
  align-items: center;
  justify-content: center;
  
  background: var(--color-bg);
  color: var(--color-text-muted);
  
  border: 1px solid var(--color-border);
  border-radius: 50%;
  
  cursor: pointer;
  
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  
  transition: 
    opacity var(--transition-medium),
    visibility var(--transition-medium),
    transform var(--transition-medium),
    color var(--transition-fast),
    border-color var(--transition-fast),
    background-color var(--transition-fast);
  
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  z-index: 100;
}

#scroll-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

#scroll-to-top:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: var(--color-bg-subtle);
}

#scroll-to-top svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

@media (max-width: 600px) {
  #scroll-to-top {
    bottom: var(--space-lg);
    right: var(--space-lg);
    width: 40px;
    height: 40px;
  }
}


/* =========================
   Image Lightbox
   ========================= */

#lightbox {
  position: fixed;
  inset: 0;
  z-index: 9999;
  
  display: flex;
  align-items: center;
  justify-content: center;
  
  background: rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  
  opacity: 0;
  visibility: hidden;
  
  transition: 
    opacity var(--transition-medium),
    visibility var(--transition-medium);
  
  cursor: zoom-out;
}

#lightbox.active {
  opacity: 1;
  visibility: visible;
}

#lightbox img {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  
  border-radius: 4px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  
  transform: scale(0.95);
  transition: transform var(--transition-medium);
}

#lightbox.active img {
  transform: scale(1);
}

#lightbox-close {
  position: absolute;
  top: var(--space-xl);
  right: var(--space-xl);
  
  width: 44px;
  height: 44px;
  
  display: flex;
  align-items: center;
  justify-content: center;
  
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  
  cursor: pointer;
  
  transition: 
    background-color var(--transition-fast),
    border-color var(--transition-fast);
}

#lightbox-close:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.3);
}

#lightbox-close svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
}

#lightbox-caption {
  position: absolute;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%);
  
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.7);
  
  max-width: 80vw;
  text-align: center;
}


/* =========================
   Reduced Motion
   ========================= */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  html {
    scroll-behavior: auto;
  }
}