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

:root {
  --bg: #fff;
  --text: #333;
  --muted: #666;
  --link: #888;
  --link-hover: #000;
  --border: #eee;
  --font:
    Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
}

[data-theme="dark"] {
  --bg: #1a1a1a;
  --text: #e0e0e0;
  --muted: #999;
  --link-hover: #fff;
  --border: #333;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font: 18px/1.4 var(--font);
  color: var(--text);
  background: var(--bg);
}

h1,
h2,
h3 {
  margin-bottom: 2rem;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 2rem;
}

p {
  margin-bottom: 1rem;
}

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

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

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

small,
time {
  font-size: 15px;
  color: var(--muted);
}

/* Layout */
.wrapper-masthead {
  margin: 0 2rem 3rem;
}

.masthead {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-info {
  display: flex;
  flex-direction: column;
  margin-left: 2rem;
}

.site-info h1 {
  margin: 0;
  font-size: 1.75rem;
  font-weight: 300;
  letter-spacing: 1px;
}

.site-description {
  margin: -0.25rem 0 0 0;
  color: var(--muted);
  font-size: 1rem;
}

header nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

footer {
  margin-top: 4rem;
  text-align: center;
}

article {
  margin-bottom: 2rem;
}

.theme-toggle {
  background: transparent;
  border: none;
  padding: 0.5rem;
  cursor: pointer;
  color: var(--muted);
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  color: var(--link-hover);
}

.giscus-container {
  margin-top: 3rem;
}

@media (max-width: 640px) {
  .masthead {
    flex-direction: column;
    text-align: center;
    gap: 1rem;
  }

  header nav {
    gap: 0.75rem;
  }
}