/* Timeless Blog: no framework, no webfont, no script. */

:root {
  --paper: #f2efe4;
  --paper-soft: #faf8f0;
  --ink: #151515;
  --muted: #64605a;
  --line: #c9c0b0;
  --rule: #83796b;
  --accent: #315b5c;
  --accent-strong: #214748;
  --accent-warm: #8c3d3f;
  --code-bg: #e9e2d2;
  --code-ink: #1b2424;
  --mark: #dfece3;
  --focus: #b35b2d;
  --measure: 720px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #171715;
    --paper-soft: #20201d;
    --ink: #eee7d8;
    --muted: #aaa294;
    --line: #474238;
    --rule: #776d5e;
    --accent: #8fc5bd;
    --accent-strong: #b7ddd7;
    --accent-warm: #e19a9d;
    --code-bg: #252822;
    --code-ink: #f0eadf;
    --mark: #24332d;
    --focus: #e3ad72;
  }
}

* {
  box-sizing: border-box;
}

html {
  background: var(--paper);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(180deg, rgba(49, 91, 92, 0.08), transparent 18rem),
    var(--paper);
  font-family: "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", Georgia, "Times New Roman", serif;
  font-size: 17px;
  line-height: 1.78;
}

body::before {
  display: block;
  height: 5px;
  background: linear-gradient(90deg, var(--accent) 0 38%, var(--accent-warm) 38% 56%, var(--ink) 56% 100%);
  content: "";
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 10;
  padding: 0.45rem 0.7rem;
  color: var(--paper-soft);
  background: var(--ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85rem;
}

.skip-link:focus {
  top: 1rem;
}

.site-header,
.site-main,
.site-footer {
  width: min(var(--measure), calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  padding: 2.4rem 0 1.15rem;
  border-bottom: 3px double var(--line);
}

.site-shell {
  padding-left: 1rem;
  border-left: 4px solid var(--accent);
}

.site-kicker {
  margin: 0 0 0.55rem;
  color: var(--accent-strong);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.78rem;
  line-height: 1.4;
}

.site-header h1 {
  margin: 0;
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.25;
}

.site-header h1 a {
  color: var(--ink);
  text-decoration: none;
}

.site-description {
  max-width: 36rem;
  margin: 0.65rem 0 0;
  color: var(--muted);
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.75rem;
  margin-top: 1.25rem;
  padding-top: 0.9rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.86rem;
}

.site-nav a {
  min-height: 2rem;
  padding: 0.12rem 0.25rem;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.site-nav a:hover,
.site-nav a:focus {
  color: var(--accent-strong);
  background: var(--mark);
  border-bottom-color: var(--accent-warm);
}

.site-main {
  padding: 2.35rem 0 2.6rem;
}

.site-footer {
  padding: 1.35rem 0 2.4rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.82rem;
}

.site-footer p {
  margin: 0.25rem 0;
}

main a {
  color: var(--accent-strong);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

main a:hover,
main a:focus {
  color: var(--accent-warm);
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

h1,
h2,
h3 {
  color: var(--ink);
  line-height: 1.38;
}

.site-main > h1:first-child,
.site-main article > h1:first-child {
  margin-top: 0;
}

.site-main h1 {
  margin: 0 0 1rem;
  font-size: 2rem;
}

.site-main h2 {
  margin: 2.1rem 0 0.7rem;
  padding-top: 0.1rem;
  font-size: 1.34rem;
}

.site-main h3 {
  margin: 1.6rem 0 0.5rem;
  font-size: 1.12rem;
}

p {
  margin: 0.78rem 0;
}

article > time,
.post-item time,
.archive-list time {
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.86rem;
}

article > time {
  display: block;
  margin: -0.3rem 0 1.35rem;
}

ul,
ol {
  padding-left: 1.45em;
}

li {
  margin: 0.28rem 0;
}

blockquote {
  margin: 1.25rem 0;
  padding: 0.35rem 0 0.35rem 1rem;
  color: var(--muted);
  border-left: 4px solid var(--accent);
}

hr {
  height: 1px;
  margin: 2rem 0;
  background: var(--line);
  border: 0;
}

pre {
  overflow-x: auto;
  margin: 1.2rem 0;
  padding: 1rem;
  color: var(--code-ink);
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 6px;
  line-height: 1.55;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 0.9em;
}

:not(pre) > code {
  padding: 0.1em 0.28em;
  color: var(--code-ink);
  background: var(--code-bg);
  border-radius: 3px;
}

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

.post-list {
  margin-top: 1.65rem;
}

.post-item {
  position: relative;
  padding: 1.15rem 0 1.25rem 1rem;
  border-top: 1px solid var(--line);
}

.post-item::before {
  position: absolute;
  left: 0;
  top: 1.35rem;
  width: 0.32rem;
  height: 0.32rem;
  background: var(--accent-warm);
  content: "";
}

.post-item h2 {
  margin: 0 0 0.25rem;
  padding: 0;
  font-size: 1.18rem;
}

.post-item h2 a {
  color: var(--ink);
  text-decoration: none;
}

.post-item h2 a:hover,
.post-item h2 a:focus {
  color: var(--accent-strong);
  text-decoration: underline;
}

.post-item .summary {
  max-width: 40rem;
  margin: 0.35rem 0 0;
  color: var(--muted);
}

.archive-list {
  list-style: none;
  padding: 0;
}

.archive-list li {
  display: grid;
  grid-template-columns: 8.5rem 1fr;
  gap: 0.75rem;
  align-items: baseline;
  margin: 0;
  padding: 0.55rem 0;
  border-top: 1px solid var(--line);
}

.version-links {
  margin-top: 2.4rem;
  padding: 0.85rem 1rem;
  color: var(--muted);
  background: var(--paper-soft);
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: 6px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.84rem;
}

.version-links a {
  display: inline-block;
  margin: 0 0.12rem;
}

@media (max-width: 560px) {
  body {
    font-size: 16px;
  }

  .site-header {
    padding-top: 1.5rem;
  }

  .site-header h1,
  .site-main h1 {
    font-size: 1.62rem;
  }

  .site-shell {
    padding-left: 0.8rem;
  }

  .archive-list li {
    grid-template-columns: 1fr;
    gap: 0.1rem;
  }

  .version-links {
    padding: 0.75rem;
  }
}