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

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
}

/* ========================================
   API: THEME VARIABLES
   Change these to customize the entire site
   ======================================== */
:root {
  /* Colors */
  --c-fg: #1a1a1a;
  --c-fg-muted: #666;
  --c-accent: #2563eb;
  --c-accent-hover: #1d4ed8;
  --c-bg: #fff;
  --c-bg-secondary: #f5f5f5;
  --c-border: #ddd;
  --c-selection: #dbeafe;
  
  /* Fonts */
  --font-sans: "Adwaita Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  --font-serif: Georgia, "Times New Roman", serif;
  --font-text: var(--font-sans);
  --font-mono: "SF Mono", Monaco, monospace;
  
  /* Type Scale */
  --text-xs: 0.75rem;
  --text-sm: 0.8125rem;
  --text-base: 1rem;
  --text-md: 1.0625rem;
  --text-lg: 1.125rem;
  --text-xl: 1.375rem;
  --text-code: 0.875em;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  
  /* Layout */
  --measure: 64ch;
  --border-width: 1px;
  --border-width-thick: 2px;
  
  /* Typography */
  --leading-tight: 1.25;
  --leading-base: 1.5;
  --letter-spacing-tight: -0.02em;
  --letter-spacing-tighter: -0.025em;
  --letter-spacing-loose: 0.05em;
  
  /* Links */
  --link-underline-offset: 0.1em;
}

/* ========================================
   BASE STYLES
   ======================================== */
html {
  font-size: var(--text-sm);
}

body {
  font-family: var(--font-text);
  line-height: var(--leading-base);
  color: var(--c-fg);
  background: var(--c-bg);
  max-width: var(--measure);
  margin: 0 auto;
  padding: var(--space-md);
}

/* ========================================
   NAVIGATION
   ======================================== */
nav {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: var(--border-width) solid var(--c-border);
}

nav > div {
  display: flex;
  gap: var(--space-md);
}

/* ========================================
   TYPOGRAPHY
   ======================================== */

/* Headings */
h1, h2, h3, h4 {
  font-weight: 600;
  line-height: var(--leading-tight);
  letter-spacing: var(--letter-spacing-tight);
}

/* Content headings - article content h1 equals h2 visually 
   since article header h1 is the real title */
.content h1 { font-size: var(--text-lg); }
h2 { font-size: var(--text-md); }
h3 { font-size: var(--text-base); }
h4 { font-size: var(--text-sm); }

h1, h2, h3, h4 {
  margin-top: var(--space-lg);
  margin-bottom: var(--space-xs);
}

/* Paragraphs */
p {
  margin-bottom: var(--space-sm);
}

/* Lists */
ul, ol {
  margin-bottom: var(--space-sm);
  padding-left: var(--space-md);
}

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

/* ========================================
   LINKS
   ======================================== */
a {
  color: var(--c-accent);
  text-decoration: underline;
  text-underline-offset: var(--link-underline-offset);
}

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

a:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 2px;
}

/* ========================================
   POST LIST (Blog page)
   ======================================== */
main > ul {
  padding: 0;
}

main > ul > li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-md);
  align-items: baseline;
  margin-bottom: var(--space-xs);
}

main > ul time {
  font-size: var(--text-sm);
  color: var(--c-fg-muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* ========================================
   ARTICLE (Post page)
   ======================================== */
article > header {
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: var(--border-width) solid var(--c-border);
}

article > header h1 {
  font-size: var(--text-xl);
}

article > header .post-meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

article > header time {
  font-size: var(--text-sm);
  color: var(--c-fg-muted);
}

article > header .view-md {
  font-size: var(--text-sm);
}

/* ========================================
   FIGURES
   ======================================== */
figure {
  margin: var(--space-md) 0;
}

figcaption {
  font-size: var(--text-sm);
  color: var(--c-fg-muted);
  margin-top: var(--space-xs);
}

/* ========================================
   CODE
   ======================================== */
code, pre {
  font-family: var(--font-mono);
  font-size: var(--text-code);
}

code {
  background: var(--c-bg-secondary);
  padding: 0.1em 0.3em;
}

pre {
  background: var(--c-bg-secondary);
  padding: var(--space-sm);
  overflow-x: auto;
  line-height: var(--leading-tight);
  margin-bottom: var(--space-sm);
}

pre code {
  background: none;
  padding: 0;
}

/* ========================================
   BLOCKQUOTE
   ======================================== */
blockquote {
  margin: var(--space-sm) 0 var(--space-sm) var(--space-md);
  padding-left: var(--space-sm);
  border-left: var(--border-width-thick) solid var(--c-border);
  color: var(--c-fg-muted);
}

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

/* ========================================
   HORIZONTAL RULE
   ======================================== */
hr {
  border: 0;
  border-top: var(--border-width) solid var(--c-border);
  margin: var(--space-md) 0;
}

/* ========================================
   SELECTION
   ======================================== */
::selection {
  background: var(--c-selection);
}

/* ========================================
   FOOTER
   ======================================== */
footer {
  margin-top: var(--space-xl);
  padding-top: var(--space-md);
  border-top: var(--border-width) solid var(--c-border);
  font-size: var(--text-sm);
  color: var(--c-fg-muted);
  text-align: right;
}

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

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

/* ========================================
   PRINT STYLES
   ======================================== */
@media print {
  footer {
    display: none;
  }

  nav {
    display: none;
  }
  
  body {
    max-width: none;
    padding: 0;
  }
  
  a {
    color: var(--c-fg);
    text-decoration: underline;
  }
  
  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: var(--text-sm);
    opacity: 0.8;
    vertical-align: baseline;
    margin-left: 0.1em;
  }
  
  article > header {
    border-bottom-color: #999;
  }
}