/* Custom properties */
:root {
  --color-bg: #ffffff;
  --color-text: #1a1a1a;
  --color-text-secondary: #555555;
  --color-link: #0056b3;
  --color-link-hover: #003d80;
  --color-border: #e0e0e0;
  --color-code-bg: #f5f5f5;
  --max-width: 700px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #1a1a1a;
    --color-text: #e0e0e0;
    --color-text-secondary: #a0a0a0;
    --color-link: #6db3f2;
    --color-link-hover: #9ccbff;
    --color-border: #333333;
    --color-code-bg: #2a2a2a;
  }
}

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

/* Base */
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", Arial,
    sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  padding: 0 1rem;
}

/* Layout */
header,
main,
footer {
  max-width: var(--max-width);
  margin: 0 auto;
}

main {
  padding: 2rem 0;
}

/* Navigation */
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-border);
}

.site-title {
  font-weight: 700;
  font-size: 1.1rem;
  text-decoration: none;
  color: var(--color-text);
}

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

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

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

/* Typography */
h1 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  line-height: 1.3;
}

h2 {
  font-size: 1.4rem;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

p {
  margin-bottom: 1rem;
}

a {
  color: var(--color-link);
}

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

code {
  background-color: var(--color-code-bg);
  padding: 0.15rem 0.3rem;
  border-radius: 3px;
  font-size: 0.9em;
}

/* Post list */
.post-list {
  list-style: none;
  margin-top: 1.5rem;
}

.post-list li {
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-border);
}

.post-list a {
  font-size: 1.1rem;
  font-weight: 600;
  text-decoration: none;
}

.post-list time {
  display: block;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-top: 0.25rem;
}

.post-list p {
  margin-top: 0.5rem;
  margin-bottom: 0;
  color: var(--color-text-secondary);
}

/* Footer */
footer {
  padding: 2rem 0;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 768px) {
  nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }

  nav ul {
    gap: 1rem;
  }

  h1 {
    font-size: 1.5rem;
  }
}