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

body,
h1,
h2,
h3,
h4,
p,
ul,
ol {
  margin: 0;
  padding: 0;
}

/* Base styles */
:root {
  --color-bg: #ffffff;
  --color-text: #1a1a1a;
  --color-text-muted: #666666;
  --color-link: #0066cc;
  --color-link-hover: #004499;
  --color-border: #e0e0e0;
  --color-code-bg: #f5f5f5;
  --max-width: 42rem;
  --spacing: 1.5rem;

  /* Heading highlight colors */
  --color-h1: #ff1493;  /* Hot Pink */
  --color-h2: #00bcd4;  /* Cyan */
  --color-h3: #32cd32;  /* Lime Green */
  --color-h4: #9b59b6;  /* Purple */
  --color-h5: #ff6b35;  /* Tangerine */
  --color-h6: #e74c3c;  /* Coral Red */

  --color-highlight-text: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #1a1a1a;
    --color-text: #e0e0e0;
    --color-text-muted: #a0a0a0;
    --color-link: #6db3f2;
    --color-link-hover: #9dcbf7;
    --color-border: #333333;
    --color-code-bg: #2d2d2d;
  }
}

html {
  font-size: 100%;
  line-height: 1.6;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-link);
  color: white;
  padding: 0.5rem 1rem;
  z-index: 100;
  text-decoration: none;
}

.skip-link:focus {
  top: 0;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing);
}

.site-header nav {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.site-title {
  font-size: 1.25rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--color-text);
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  color: var(--color-text);
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a:focus {
  color: var(--color-link);
}

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

main:focus {
  outline: none;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  line-height: 1.3;
  margin-top: 2rem;
  margin-bottom: 1rem;
  color: var(--color-highlight-text);
  padding: 0.1em 0.5em;
  width: fit-content;
}

h1 {
  font-size: 2rem;
  margin-top: 0;
  background-color: var(--color-h1);
}

h2 {
  font-size: 1.5rem;
  background-color: var(--color-h2);
}

h3 {
  font-size: 1.25rem;
  background-color: var(--color-h3);
}

h4 {
  font-size: 1.1rem;
  background-color: var(--color-h4);
}

h5 {
  font-size: 1rem;
  background-color: var(--color-h5);
}

h6 {
  font-size: 0.875rem;
  background-color: var(--color-h6);
}

p {
  margin-bottom: 1rem;
}

/* Links */
a {
  color: var(--color-link);
}

a:hover,
a:focus {
  color: var(--color-link-hover);
}

/* Lists */
ul,
ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.25rem;
}

/* Code */
code {
  font-family: "SF Mono", Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.875em;
  background-color: var(--color-code-bg);
  padding: 0.125rem 0.25rem;
  border-radius: 3px;
}

pre {
  background-color: var(--color-code-bg);
  padding: 1rem;
  overflow-x: auto;
  border-radius: 4px;
  margin-bottom: 1rem;
}

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

/* Card grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.card {
  display: block;
  padding: 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  text-decoration: none;
  color: var(--color-text);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.card:hover,
.card:focus {
  border-color: var(--color-link);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  color: var(--color-text);
}

.card-title {
  font-size: 1.25rem;
  margin: 0 0 0.5rem 0;
  background: none;
  color: var(--color-text);
  padding: 0;
}

.card-body {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* Post list */
.post-list {
  list-style: none;
  padding: 0;
}

.post-list li {
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.post-list li:last-child {
  border-bottom: none;
}

.post-list a {
  font-size: 1.25rem;
  font-weight: 600;
  text-decoration: none;
}

.post-list a:hover,
.post-list a:focus {
  text-decoration: underline;
}

.post-meta {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin-top: 0.25rem;
}

/* Post */
.post-header {
  margin-bottom: 2rem;
}

.post-title {
  margin-bottom: 0.5rem;
}

.post-content img {
  max-width: 100%;
  height: auto;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--spacing);
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

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

.site-footer a:hover,
.site-footer a:focus {
  color: var(--color-link);
}

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

/* Responsive adjustments */
@media (max-width: 600px) {
  :root {
    --spacing: 1rem;
  }

  h1 {
    font-size: 1.75rem;
  }

  h2 {
    font-size: 1.35rem;
  }

  .site-header nav {
    flex-direction: column;
    align-items: flex-start;
  }
}