:root {
  color-scheme: light dark;
  --bg:         light-dark(#f7f7f5, #1c1c1a);
  --fg:         light-dark(#1a1a1a, #e8e8e4);
  --muted:      light-dark(#666, #999);
  --link:       light-dark(#005fcc, #7aa2f7);
  --link-hover: light-dark(#003a99, #5586e0);
  --border:     light-dark(#ddd, #3a3a3a);
  --col: 65rch;
}

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

html {
  font-family: system-ui, sans-serif;
  line-height: 1.65;
  background: var(--bg);
  color: var(--fg);
  margin: 0;
}

body {
  margin: 0;
  padding-inline: clamp(1rem, 4vw, 2rem);
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 100dvh;
}

body > header,
main,
body > footer {
  max-width: var(--col);
  width: 100%;
  margin-inline: auto;
}

body > header {
  padding-block: 1.2rem;
  border-bottom: 1px solid var(--border);
}

nav {
  display: flex;
  gap: 1.5rem;
}

nav a,
nav [aria-current="page"] {
  color: var(--fg);
  text-decoration: none;
  font-weight: 500;
}

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

nav [aria-current="page"] {
  color: var(--muted);
}

main {
  padding-block: 2.5rem;
}

body > footer {
  padding-block: 1.2rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.875rem;
}

h1, h2, h3, h4 {
  text-wrap: balance;
  line-height: 1.25;
}

p {
  text-wrap: pretty;
}

a {
  color: var(--link);
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

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

:focus-visible {
  outline: 2px solid var(--link);
  outline-offset: 3px;
  border-radius: 2px;
}

button, .button {
  display: inline-flex;
  align-items: center;
  padding: 0.35em 0.85em;
  background: transparent;
  color: var(--link);
  border: 1px solid currentColor;
  border-radius: 4px;
  font: inherit;
  font-size: 0.9rem;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.12s, color 0.12s;
}

button:hover, .button:hover {
  background: var(--link);
  color: var(--bg);
}

/* post: date sits just below the title */
article time {
  display: block;
  color: var(--muted);
  font-size: 0.875rem;
  margin-block: 0.3em 2em;
}

/* writing list */
ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

ul li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1rem;
  padding-block: 0.6rem;
  border-bottom: 1px solid var(--border);
}

ul li:first-child {
  border-top: 1px solid var(--border);
}

ul li:last-child {
  border-bottom: none;
}

ul li time {
  color: var(--muted);
  font-size: 0.875rem;
  white-space: nowrap;
}

/* snow toggle (home page) */
.snow-toggle {
  position: sticky;
  bottom: 1rem;
  margin-block-start: 2.5rem;
  width: fit-content;
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.6rem 0.85rem;
  font-size: 0.85rem;
  backdrop-filter: blur(4px);
}

.snow-toggle legend {
  transform: translate(0, -0.1em);
}

.snow-toggle label {
  margin-inline-start: 0.25rem;
}

.snow-toggle label::before {
  content: " ";
  position: absolute;
  transform: translate(-0.49rem, 0.15rem);
  width: 0.5rem;
  height: 1rem;
  cursor: default;
}