/*
 * Personal Site Builder - Minimal Theme
 * Typography: iA Writer Fonts (https://github.com/iaolo/iA-Fonts)
 */

@import url('/fonts/fonts.css');

/* ============ Design Tokens ============ */
:root {
  /* Colors - Light Mode */
  --color-bg: var(--theme-bg, #fafafa);
  --color-surface: var(--theme-surface, #ffffff);
  --color-text: var(--theme-text, #1a1a1a);
  --color-text-secondary: var(--theme-text-secondary, #666666);
  --color-border: var(--theme-border, #e5e5e5);
  --color-accent: var(--theme-accent, #3b82f6);
  --color-accent-hover: color-mix(in srgb, var(--color-accent) 80%, black);
  
  /* Typography - Base fonts */
  --font-sans: 'iA Writer Quattro', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-serif: 'Crimson Pro', Georgia, 'Times New Roman', serif;
  --font-mono: 'iA Writer Mono', 'SF Mono', Consolas, monospace;
  
  /* Active body font (toggled by settings) */
  --font-body: var(--font-sans);
  
  /* Font sizes - using rem for consistency */
  --font-size-base: 18px;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  
  --line-height: 1.7;
  --line-height-tight: 1.3;
  
  /* Spacing scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  
  /* Layout - UNIFIED */
  --content-width: 680px;
  --content-width-wide: 900px;
  --page-padding: var(--space-6);
  
  /* Z-index scale - UNIFIED */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-overlay: 300;
  --z-modal: 400;
  --z-tooltip: 500;
  
  /* Shadows - UNIFIED scale */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
  
  /* Transitions - UNIFIED */
  --transition-fast: 0.15s ease;
  --transition-base: 0.2s ease;
  --transition-slow: 0.3s ease;
  
  /* Effects */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
}

/* ============ Font Setting: Serif ============ */
[data-font="serif"] {
  --font-body: var(--font-serif);
}

[data-font="serif"] .post-content,
[data-font="serif"] .about-content,
[data-font="serif"] .page-content {
  font-weight: 300;
  font-size: calc(var(--font-size-lg) * 1.15);
  line-height: 1.8;
}

[data-font="serif"] .post-content strong,
[data-font="serif"] .about-content strong,
[data-font="serif"] .page-content strong {
  font-weight: 500;
}

/* ============ Size Setting: Compact ============ */
[data-size="compact"] {
  --font-size-base: 16px;
  --font-size-sm: 0.8125rem;
  --font-size-lg: 1rem;
  --font-size-2xl: 1.375rem;
  --font-size-3xl: 1.75rem;
  --font-size-4xl: 2rem;
  --line-height: 1.6;
  --content-width: 620px;
  --page-padding: var(--space-5);
}

/* ============ Dark Mode ============ */
[data-theme="dark"] {
  --color-bg: var(--theme-bg-dark, #0a0a0a);
  --color-surface: var(--theme-surface-dark, #141414);
  --color-text: var(--theme-text-dark, #f0f0f0);
  --color-text-secondary: var(--theme-text-secondary-dark, #a0a0a0);
  --color-border: var(--theme-border-dark, #262626);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: var(--theme-bg-dark, #0a0a0a);
    --color-surface: var(--theme-surface-dark, #141414);
    --color-text: var(--theme-text-dark, #f0f0f0);
    --color-text-secondary: var(--theme-text-secondary-dark, #a0a0a0);
    --color-border: var(--theme-border-dark, #262626);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
  }
}

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

html {
  font-size: var(--font-size-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: var(--line-height);
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-base), color var(--transition-base);
}

/* ============ Typography ============ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 600;
  line-height: var(--line-height-tight);
  letter-spacing: -0.02em;
  color: var(--color-text);
}

h1 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-6);
}

h2 {
  font-size: var(--font-size-2xl);
  margin-top: var(--space-12);
  margin-bottom: var(--space-4);
}

h3 {
  font-size: var(--font-size-xl);
  margin-top: var(--space-8);
  margin-bottom: var(--space-2);
}

p {
  margin-bottom: var(--space-4);
}

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

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

/* Focus states for accessibility */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

strong {
  font-weight: 600;
}

em {
  font-style: italic;
}

/* ============ Code ============ */
code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
}

pre {
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  line-height: 1.6;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  overflow-x: auto;
  margin: var(--space-6) 0;
  white-space: pre-wrap;
  word-wrap: break-word;
  word-break: break-word;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
  white-space: pre-wrap;
  word-wrap: break-word;
}

/* ============ Blockquotes ============ */
blockquote {
  border-left: 3px solid var(--color-accent);
  padding-left: var(--space-6);
  margin: var(--space-6) 0;
  color: var(--color-text-secondary);
  font-style: italic;
}

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

/* ============ Lists ============ */
ul, ol {
  margin: var(--space-4) 0;
  padding-left: var(--space-6);
}

li {
  margin-bottom: var(--space-1);
}

li::marker {
  color: var(--color-text-secondary);
}

/* ============ Images & Figures ============ */
img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

figure {
  margin: var(--space-8) 0;
}

figure img {
  display: block;
  margin: 0 auto;
}

figcaption {
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  text-align: center;
  margin-top: var(--space-2);
  font-style: italic;
  line-height: 1.5;
}

/* ============ Footnotes ============ */
.footnote-ref {
  position: relative;
  cursor: help;
}

.footnote-ref a {
  font-size: 0.75em;
  vertical-align: super;
  text-decoration: none;
  color: var(--color-accent);
  padding: 0 2px;
}

.footnote-ref a:hover {
  text-decoration: underline;
}

.footnote-tooltip {
  position: absolute;
  z-index: var(--z-tooltip);
  max-width: 320px;
  padding: var(--space-2) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: var(--font-size-sm);
  line-height: 1.5;
  color: var(--color-text);
  pointer-events: none;
  animation: tooltip-fade var(--transition-fast);
}

@keyframes tooltip-fade {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.footnotes-separator {
  margin-top: var(--space-16);
}

.footnotes {
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-6);
}

.footnotes ol {
  padding-left: var(--space-6);
  margin: 0;
}

.footnotes li {
  margin-bottom: var(--space-2);
  padding-left: var(--space-1);
}

.footnotes li:target {
  background: color-mix(in srgb, var(--color-accent) 15%, transparent);
  border-radius: var(--radius-md);
  padding: var(--space-1) var(--space-2);
  margin-left: calc(var(--space-2) * -1);
}

.footnote-back {
  margin-left: var(--space-1);
  text-decoration: none;
  color: var(--color-accent);
}

/* ============ Horizontal Rule ============ */
hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-12) 0;
}

/* ============ Site Header ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: rgba(var(--theme-bg-rgb, 250, 250, 250), 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  /* Full width */
  width: 100%;
}

[data-theme="dark"] .site-header {
  background: rgba(var(--theme-bg-dark-rgb, 10, 10, 10), 0.9);
}

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

/* ============ Navigation ============ */
.site-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-4) var(--page-padding);
  font-family: var(--font-sans);
}

.site-title {
  font-weight: 600;
  font-size: var(--font-size-lg);
  color: var(--color-text);
  letter-spacing: -0.01em;
  text-decoration: none;
}

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

/* Nav Links */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-links a {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
  position: relative;
}

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

/* Active nav state */
.nav-links a.active {
  color: var(--color-text);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
}

/* Hamburger button - hidden on desktop */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  width: 40px;
  height: 40px;
  position: relative;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.nav-toggle:hover {
  background: var(--color-surface);
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.nav-toggle span {
  display: block;
  position: absolute;
  left: 8px;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: transform var(--transition-base), opacity var(--transition-base), top var(--transition-base);
}

.nav-toggle span:nth-child(1) { top: 11px; }
.nav-toggle span:nth-child(2) { top: 19px; }
.nav-toggle span:nth-child(3) { top: 27px; }

/* Nav overlay - not used in dropdown style */
.nav-overlay {
  display: none;
}

/* ============ Mobile Navigation - Fullscreen ============ */
@media (max-width: 640px) {
  .site-nav {
    padding: var(--space-3) var(--space-4);
  }
  
  .nav-toggle {
    display: block;
    z-index: calc(var(--z-overlay) + 1); /* Above the overlay */
  }
  
  .site-title {
    z-index: calc(var(--z-overlay) + 1); /* Above the overlay */
    position: relative;
  }
  
  /* Fullscreen nav overlay */
  .nav-links {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 0;
    padding: calc(60px + var(--space-8)) var(--space-6) var(--space-6);
    background: var(--color-bg);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
    z-index: var(--z-overlay);
  }
  
  .nav-links a {
    display: block;
    width: 100%;
    padding: var(--space-4) 0;
    font-size: var(--font-size-2xl);
    font-weight: 500;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border);
  }
  
  .nav-links a:hover {
    color: var(--color-accent);
  }
  
  .nav-links a.active {
    color: var(--color-accent);
  }
  
  .nav-links a.active::after {
    display: none;
  }
  
  /* Open state */
  body.nav-open {
    overflow: hidden;
  }
  
  body.nav-open .nav-links {
    opacity: 1;
    visibility: visible;
  }
  
  /* Hamburger to X */
  body.nav-open .nav-toggle span:nth-child(1) {
    top: 19px;
    transform: rotate(45deg);
  }
  
  body.nav-open .nav-toggle span:nth-child(2) {
    opacity: 0;
  }
  
  body.nav-open .nav-toggle span:nth-child(3) {
    top: 19px;
    transform: rotate(-45deg);
  }
}

/* ============ Main Content ============ */
main {
  flex: 1;
  padding: var(--space-12) var(--page-padding);
  width: 100%;
}

/* Unified content container */
.content-container {
  max-width: var(--content-width);
  margin: 0 auto;
}

.content-container--wide {
  max-width: var(--content-width-wide);
}

/* ============ Page Content (About, Connect, etc.) ============ */
.page-content {
  font-family: var(--font-body);
}

.page-content h1 {
  margin-bottom: var(--space-8);
}

.page-content > *:first-child {
  margin-top: 0;
}

.page-content > *:last-child {
  margin-bottom: 0;
}

/* ============ Blog Index ============ */
.posts-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-10);
}

.post-preview {
  padding-bottom: var(--space-8);
  border-bottom: 1px solid var(--color-border);
}

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

.post-preview h2 {
  font-size: var(--font-size-2xl);
  margin: 0 0 var(--space-1);
}

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

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

.post-preview time {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-family: var(--font-mono);
}

.post-preview p {
  margin-top: var(--space-2);
  margin-bottom: 0;
  color: var(--color-text-secondary);
}

/* ============ Single Post ============ */
.post {
  --toc-width: 180px;
  --toc-gap: var(--space-10);
  position: relative;
  max-width: var(--content-width);
  margin: 0 auto;
}

/* Table of Contents - Fixed in left margin */
.post-toc {
  position: fixed;
  top: calc(80px + var(--space-8));
  width: var(--toc-width);
  /* Position to the left of centered content */
  right: calc(50% + (var(--content-width) / 2) + var(--toc-gap));
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
}

.post-toc time {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
}

.toc-title {
  font-weight: 600;
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.toc-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.toc-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: var(--space-1) 0;
  border-left: 2px solid transparent;
  padding-left: var(--space-3);
  margin-left: calc(var(--space-3) * -1);
  transition: all var(--transition-fast);
  line-height: 1.4;
}

.toc-links a:hover {
  color: var(--color-text);
  border-left-color: var(--color-accent);
}

.toc-links a.toc-indent {
  padding-left: var(--space-6);
  font-size: var(--font-size-xs);
}

/* Post Content - Centered */
.post-content-wrapper {
  max-width: var(--content-width);
}

.post-header {
  margin-bottom: var(--space-8);
}

.back-to-blog {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
  transition: color var(--transition-fast);
}

.back-to-blog:hover {
  color: var(--color-accent);
}

.post-header h1 {
  margin-bottom: var(--space-2);
}

.post-header .post-description {
  font-size: var(--font-size-md);
  color: var(--color-text-secondary);
  margin: 0;
}

.post-content {
  font-family: var(--font-body);
  font-size: var(--font-size-lg);
}

.post-content > *:first-child {
  margin-top: 0;
}

.post-content > *:last-child {
  margin-bottom: 0;
}

/* Download Button in TOC */
.post-toc .download-post {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  text-decoration: none;
  margin-top: var(--space-2);
  margin-bottom: var(--space-4);
  transition: color var(--transition-fast);
}

.post-toc .download-post:hover {
  color: var(--color-accent);
}

.post-toc .download-post svg {
  opacity: 0.6;
}

/* Scroll offset for anchor links */
.post-content h2[id],
.post-content h3[id] {
  scroll-margin-top: calc(80px + var(--space-4));
}

/* Hide TOC when viewport too narrow to fit it in margin */
@media (max-width: 1100px) {
  .post-toc {
    position: static;
    width: auto;
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--color-border);
  }
  
  .toc-links {
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--space-2) var(--space-4);
  }
  
  .toc-links a {
    border-left: none;
    padding-left: 0;
    margin-left: 0;
    padding: var(--space-1) 0;
  }
  
  .toc-links a.toc-indent {
    padding-left: 0;
    font-size: var(--font-size-sm);
  }
}

/* ============ Links Page ============ */
.links-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.link-item {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  transition: border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.link-item:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.link-item:hover .link-arrow {
  opacity: 1;
  transform: translateX(0);
}

.link-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.link-icon svg {
  display: block;
}

.link-title {
  font-weight: 500;
  flex: 1;
}

.link-arrow {
  display: flex;
  color: var(--color-text-secondary);
  opacity: 0;
  transform: translateX(-4px);
  transition: all var(--transition-fast);
}

/* ============ Empty State ============ */
.empty-state {
  text-align: center;
  color: var(--color-text-secondary);
  padding: var(--space-16) 0;
}

/* ============ Site Footer ============ */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-4) var(--page-padding);
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
}

.site-footer a {
  color: var(--color-text-secondary);
}

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

.footer-links {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.footer-separator {
  color: var(--color-border);
}

.footer-credits {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

/* Settings Toggle Button */
.settings-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-1) var(--space-2);
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.settings-toggle:hover {
  border-color: var(--color-text-secondary);
  color: var(--color-text);
}

.settings-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.settings-toggle svg {
  width: 14px;
  height: 14px;
}

/* Settings Popover */
.settings-wrapper {
  position: relative;
}

.settings-popover {
  position: absolute;
  bottom: 100%;
  right: 0;
  margin-bottom: var(--space-2);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-4);
  min-width: 200px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all var(--transition-base);
  z-index: var(--z-dropdown);
}

.settings-popover.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.settings-group {
  margin-bottom: var(--space-4);
}

.settings-group:last-child {
  margin-bottom: 0;
}

.settings-label {
  display: block;
  font-family: var(--font-sans);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-1);
}

.settings-options {
  display: flex;
  gap: 2px;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  padding: 2px;
}

.settings-option {
  flex: 1;
  padding: var(--space-1) var(--space-2);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.settings-option:hover {
  color: var(--color-text);
}

.settings-option:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
}

.settings-option.active {
  background: var(--color-surface);
  color: var(--color-text);
  box-shadow: var(--shadow-sm);
}

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

/* Tablet */
@media (max-width: 900px) {
  main {
    padding: var(--space-8) var(--space-5);
  }
}

/* Mobile */
@media (max-width: 640px) {
  :root {
    --font-size-base: 17px;
  }
  
  h1 {
    font-size: var(--font-size-2xl);
  }
  
  h2 {
    font-size: var(--font-size-xl);
  }
  
  main {
    padding: var(--space-8) var(--space-4);
  }
  
  pre {
    padding: var(--space-4);
    margin-left: calc(var(--space-4) * -1);
    margin-right: calc(var(--space-4) * -1);
    border-radius: 0;
    border-left: none;
    border-right: none;
  }
  
  .footer-inner {
    flex-direction: column;
    text-align: center;
    gap: var(--space-3);
  }
  
  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .settings-popover {
    right: auto;
    left: 50%;
    transform: translateX(-50%) translateY(8px);
    min-width: 240px;
  }
  
  .settings-popover.open {
    transform: translateX(-50%) translateY(0);
  }
}

/* ============ Print ============ */
@media print {
  .site-header, .site-footer, .settings-wrapper {
    display: none;
  }
  
  body {
    background: white;
    color: black;
  }
  
  a {
    color: black;
    text-decoration: underline;
  }
}