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

/* Variables */
:root {
  /* Colors - Warm, refined palette */
  --color-bg: #fafaf9;
  --color-bg-elevated: #ffffff;
  --color-text: #1c1917;
  --color-text-muted: #78716c;
  --color-text-faint: #a8a29e;
  --color-primary: #b45309;
  --color-primary-hover: #92400e;
  --color-accent: #dc2626;
  --color-border: #e7e5e4;
  --color-border-subtle: #f5f5f4;
  --color-code-bg: #f5f5f4;
  --color-selection: rgba(180, 83, 9, 0.15);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: 'Newsreader', 'Georgia', 'Times New Roman', serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', SFMono-Regular, ui-monospace, monospace;

  /* Spacing & Layout */
  --max-width: 680px;
  --spacing: 1.5rem;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

/* Dark mode - system preference */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    --color-bg: #0c0a09;
    --color-bg-elevated: #1c1917;
    --color-text: #fafaf9;
    --color-text-muted: #a8a29e;
    --color-text-faint: #78716c;
    --color-primary: #f59e0b;
    --color-primary-hover: #fbbf24;
    --color-accent: #f87171;
    --color-border: #292524;
    --color-border-subtle: #1c1917;
    --color-code-bg: #1c1917;
    --color-selection: rgba(245, 158, 11, 0.2);
  }
}

/* Dark mode - manual toggle */
:root[data-theme='dark'] {
  --color-bg: #0c0a09;
  --color-bg-elevated: #1c1917;
  --color-text: #fafaf9;
  --color-text-muted: #a8a29e;
  --color-text-faint: #78716c;
  --color-primary: #f59e0b;
  --color-primary-hover: #fbbf24;
  --color-accent: #f87171;
  --color-border: #292524;
  --color-border-subtle: #1c1917;
  --color-code-bg: #1c1917;
  --color-selection: rgba(245, 158, 11, 0.2);
}

/* Base Styles */
html {
  font-size: 16px;
  line-height: 1.6;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

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

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

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

/* Header */
.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing) var(--spacing);
  background-color: var(--color-bg);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
  background-color: rgba(250, 250, 249, 0.9);
}

:root[data-theme='dark'] .site-header {
  background-color: rgba(12, 10, 9, 0.9);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) .site-header {
    background-color: rgba(12, 10, 9, 0.9);
  }
}

.site-header nav {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.site-title:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1.75rem;
}

.nav-links a {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  font-weight: 450;
  position: relative;
  padding-bottom: 2px;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-primary);
  transition: width var(--transition-normal);
}

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

.nav-links a:hover::after {
  width: 100%;
}

/* Site Controls (Theme & Language) */
.site-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.theme-toggle,
.lang-toggle {
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  padding: 0.5rem;
  cursor: pointer;
  color: var(--color-text-faint);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
}

.theme-toggle:hover,
.lang-toggle:hover {
  color: var(--color-text);
  background-color: var(--color-code-bg);
}

.theme-toggle svg,
.lang-toggle svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.lang-label {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  display: none;
}

/* Manual override: dark mode selected - show sun */
:root[data-theme='dark'] .theme-toggle .icon-sun {
  display: block;
}

/* Manual override: light mode selected - show moon */
:root[data-theme='light'] .theme-toggle .icon-moon {
  display: block;
}

/* No manual override: follow system preference */
@media (prefers-color-scheme: light) {
  :root:not([data-theme]) .theme-toggle .icon-moon {
    display: block;
  }
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .theme-toggle .icon-sun {
    display: block;
  }
}

/* Copy button styles */
.copy-button {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  padding: 0.35rem 0.6rem;
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--color-bg-elevated);
  color: var(--color-text-faint);
  cursor: pointer;
  opacity: 0;
  transition: all var(--transition-fast);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.copy-button:hover {
  color: var(--color-text);
  background: var(--color-bg-elevated);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

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

/* Main Content */
.content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: calc(var(--spacing) * 3) var(--spacing);
  flex: 1;
  width: 100%;
}

/* Post Styles */
.post-header {
  margin-bottom: calc(var(--spacing) * 2.5);
  text-align: center;
}

.post-header h1 {
  font-family: var(--font-serif);
  font-size: 2.25rem;
  font-weight: 500;
  line-height: 1.25;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.post-header time {
  color: var(--color-text-faint);
  font-size: 0.85rem;
  font-weight: 450;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.post-content {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--color-text);
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4 {
  font-family: var(--font-serif);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  line-height: 1.3;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.post-content h1 {
  font-size: 1.75rem;
}
.post-content h2 {
  font-size: 1.5rem;
}
.post-content h3 {
  font-size: 1.25rem;
}
.post-content h4 {
  font-size: 1.1rem;
}

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

.post-content ul,
.post-content ol {
  margin-bottom: 1.5rem;
  padding-left: 1.25rem;
}

.post-content li {
  margin-bottom: 0.5rem;
  padding-left: 0.25rem;
}

.post-content li::marker {
  color: var(--color-text-faint);
}

.post-content blockquote {
  border-left: 2px solid var(--color-primary);
  padding-left: 1.25rem;
  margin: 2rem 0;
  color: var(--color-text-muted);
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.1rem;
}

.post-content code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background-color: var(--color-code-bg);
  padding: 0.15em 0.35em;
  border-radius: var(--radius-sm);
  color: var(--color-primary);
}

.post-content pre {
  position: relative;
  background-color: var(--color-code-bg);
  padding: 1.25rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: 2rem 0;
  border: 1px solid var(--color-border-subtle);
}

.post-content pre code {
  background: none;
  padding: 0;
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--color-text);
}

.post-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: 2rem 0;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  font-size: 0.95rem;
}

.post-content th,
.post-content td {
  border: 1px solid var(--color-border);
  padding: 0.875rem 1rem;
  text-align: left;
}

.post-content th {
  background-color: var(--color-code-bg);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--color-text-muted);
}

/* Tags */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
  justify-content: center;
}

.tag {
  background-color: transparent;
  color: var(--color-text-faint);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.3rem 0.75rem;
  border-radius: 9999px;
  border: 1px solid var(--color-border);
  transition: all var(--transition-fast);
}

.tag:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

/* Post List */
.post-list-header {
  text-align: left;
  margin-bottom: 1.25rem;
}

.post-list-header h1 {
  margin-bottom: 0.4rem;
}

.result-count {
  color: var(--color-text-faint);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.post-list-controls {
  margin-bottom: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.search-bar {
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-bg-elevated);
  color: var(--color-text);
  font: inherit;
  font-size: 0.95rem;
  padding: 0.75rem 0.9rem;
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.search-bar::placeholder {
  color: var(--color-text-faint);
}

.search-bar:focus-visible {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-selection);
  outline: none;
}

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

.tag-filter {
  border: 1px solid var(--color-border);
  border-radius: 9999px;
  background-color: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  font: inherit;
  font-size: 0.78rem;
  font-weight: 500;
  padding: 0.3rem 0.75rem;
  transition: all var(--transition-fast);
}

.tag-filter:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.tag-filter--active {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background-color: var(--color-selection);
}

.post-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.year-separator {
  color: var(--color-text-faint);
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  margin: 1.75rem 0 0.75rem;
  text-align: center;
  text-transform: uppercase;
}

.post-preview {
  padding: 1.6rem 0.25rem 1.6rem 0.85rem;
  margin-left: -0.85rem;
  border-bottom: 1px solid var(--color-border-subtle);
  border-left: 2px solid transparent;
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast);
}

.post-preview:hover {
  background-color: var(--color-bg-elevated);
  border-left-color: var(--color-primary);
  transform: translateX(2px);
}

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

.post-preview:last-child {
  border-bottom: none;
  margin-bottom: 0;
}

.post-preview-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
}

.post-preview h2 {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 500;
  margin-bottom: 0.3rem;
  letter-spacing: -0.01em;
}

.post-preview h2 a {
  color: var(--color-text);
  transition: color var(--transition-fast);
}

.post-preview h2 a:hover {
  color: var(--color-primary);
}

.post-preview-meta {
  color: var(--color-text-faint);
  font-size: 0.8rem;
  font-weight: 450;
}

.post-preview-meta time {
  color: var(--color-text-faint);
  font-size: 0.8rem;
  font-weight: 450;
}

.post-type-badge {
  border: 1px solid var(--color-border);
  border-radius: 9999px;
  color: var(--color-text-faint);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  line-height: 1;
  margin-top: 0.15rem;
  padding: 0.34rem 0.56rem;
  text-transform: uppercase;
  white-space: nowrap;
}

.post-type-badge--interactive {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.read-time {
  color: var(--color-text-muted);
}

.post-preview p {
  color: var(--color-text-muted);
  margin-top: 0.65rem;
  line-height: 1.6;
  font-size: 0.95rem;
}

.post-preview .tags {
  justify-content: flex-start;
  margin-top: 0.8rem;
}

.continue-reading {
  align-items: center;
  display: inline-flex;
  font-size: 0.84rem;
  font-weight: 500;
  gap: 0.35rem;
  margin-top: 0.95rem;
}

.continue-reading-arrow {
  display: inline-block;
  transition: transform var(--transition-fast);
}

.continue-reading:hover .continue-reading-arrow {
  transform: translateX(3px);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border-subtle);
  padding: calc(var(--spacing) * 2) var(--spacing);
  text-align: center;
  color: var(--color-text-faint);
  font-size: 0.8rem;
  margin-top: auto;
}

.site-footer p {
  letter-spacing: 0.02em;
}

/* Responsive */
@media (max-width: 640px) {
  :root {
    --spacing: 1.25rem;
  }

  .site-header {
    padding: 1rem var(--spacing);
  }

  .site-header nav {
    flex-wrap: wrap;
    gap: 0.75rem;
  }

  .site-title {
    font-size: 1.2rem;
  }

  .post-header h1 {
    font-size: 1.75rem;
  }

  .post-content {
    font-size: 1rem;
    line-height: 1.7;
  }

  .post-content h2 {
    font-size: 1.35rem;
  }

  .post-content h3 {
    font-size: 1.15rem;
  }

  .post-preview h2 {
    font-size: 1.2rem;
  }

  .post-preview {
    margin-left: 0;
    padding-left: 0;
  }

  .post-preview:hover {
    transform: none;
  }

  .post-preview-header {
    flex-direction: column;
    gap: 0.45rem;
  }

  .post-type-badge {
    margin-top: 0;
  }

  .nav-links {
    gap: 1.25rem;
  }

  .nav-links a {
    font-size: 0.85rem;
  }

  .site-controls {
    order: 3;
    width: 100%;
    justify-content: flex-end;
    margin-top: 0.25rem;
  }

  .content {
    padding-top: calc(var(--spacing) * 2);
    padding-bottom: calc(var(--spacing) * 2);
  }
}

/* Smooth animations for reduced motion preference */
@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;
  }
}