/* ============================================================
   SIRU HE · minimal blog
   Dark by default (neutral black-grey), single column, system fonts.
   ============================================================ */

:root {
  --width: 720px;
  --font-main: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
               system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-secondary: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
                    system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-scale: 1.0625em;

  /* 深色（默认）：中性黑灰 */
  --background-color: #141414;
  --heading-color: #f2f2f2;
  --text-color: #c8c8c8;
  --link-color: #7cb7f0;
  --visited-color: #b39ddb;
  --code-background-color: #1f1f1f;
  --code-color: #d6d6d6;
  --line-color: #3a3a3a;
  --muted-color: #8a8a8a;
}

/* 跟随系统的浅色模式 */
@media (prefers-color-scheme: light) {
  :root {
    --background-color: #fdfdfc;
    --heading-color: #1a1a1a;
    --text-color: #3d3d3d;
    --link-color: #1f6feb;
    --visited-color: #8250df;
    --code-background-color: #f4f4f2;
    --code-color: #1a1a1a;
    --line-color: #b8b8b8;
    --muted-color: #8a8a8a;
  }
}

* { box-sizing: border-box; }

body {
  font-family: var(--font-secondary);
  font-size: var(--font-scale);
  margin: auto;
  padding: 20px 20px 0;
  max-width: var(--width);
  text-align: left;
  background-color: var(--background-color);
  word-wrap: break-word;
  overflow-wrap: break-word;
  line-height: 1.75;
  color: var(--text-color);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-main);
  color: var(--heading-color);
  line-height: 1.3;
  font-weight: 600;
  margin-block: 1.6em 0.5em;
}

a { color: var(--link-color); cursor: pointer; text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 2px; }

nav a { margin-right: 8px; }

strong, b { color: var(--heading-color); font-weight: 600; }

time {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-style: normal;
  font-size: 14px;
  color: var(--muted-color);
  letter-spacing: -0.01em;
}

main { line-height: 1.8; }
main p { margin-block: 1.1em; }
main ul, main ol { padding-left: 1.4em; }
main li { margin-block: 0.35em; }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 6px 10px; border-bottom: 1px solid var(--line-color); }

hr {
  border: 0;
  border-top: 1px dashed var(--line-color);
  margin-block: 2em;
}

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

code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  padding: 2px 5px;
  background-color: var(--code-background-color);
  color: var(--code-color);
  border-radius: 3px;
  font-size: 0.88em;
}

blockquote {
  border-left: 2px solid var(--line-color);
  padding-left: 20px;
  margin-inline: 0;
  color: var(--code-color);
  font-style: italic;
  margin-block: 1.4em;
}

footer {
  padding: 40px 0 25px;
  margin-top: 3em;
  text-align: center;
  font-size: 0.875em;
  color: var(--muted-color);
  border-top: 1px dashed var(--line-color);
}

/* ---------- header ---------- */

header { padding-top: 24px; }

header .title { display: inline-block; }

header .title:hover { text-decoration: none; }

header .title h1 {
  font-size: 1.45em;
  margin-block: 0.4em 0.2em;
  letter-spacing: -0.01em;
}

header nav p { margin-block: 0.3em 0; }

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

/* 语言切换链接：用分隔线和降低对比度做视觉区分 */
header nav a.lang-switch {
  margin-left: 6px;
  padding-left: 14px;
  border-left: 1px solid var(--line-color);
  color: var(--muted-color);
  font-size: 0.92em;
}
header nav a.lang-switch:hover { color: var(--link-color); }

/* ---------- post list ---------- */

ul.blog-posts {
  list-style-type: none;
  padding: unset;
  margin-top: 1.6em;
}

ul.blog-posts li {
  display: flex;
  align-items: baseline;
  padding-block: 0.35em;
}

ul.blog-posts li span { flex: 0 0 130px; }

ul.blog-posts li a:visited { color: var(--visited-color); }

/* ---------- single post ---------- */

article { padding-top: 2em; }

article h1 {
  font-size: 1.55em;
  line-height: 1.35;
  margin-block: 0.4em 0.3em;
  letter-spacing: -0.01em;
}

article .post-meta { margin-top: 0; }

.post-back {
  margin-top: 3em;
  font-size: 0.9em;
}

/* code blocks */
.highlight, .code {
  padding: 4px 16px;
  background-color: var(--code-background-color);
  color: var(--code-color);
  border-radius: 4px;
  margin-block: 1.5em;
  overflow-x: auto;
  font-size: 0.9em;
  line-height: 1.55;
}

.highlight pre { margin: 1em 0; }
.highlight code { background: none; padding: 0; font-size: inherit; }

/* ---------- home ---------- */

.intro { padding-top: 1.6em; }
.intro p { margin-block: 1.15em; }

/* ---------- responsive ---------- */

@media (max-width: 520px) {
  body { padding-inline: 16px; }
  ul.blog-posts li { flex-direction: column; padding-block: 0.6em; }
  ul.blog-posts li span { flex: none; margin-bottom: 2px; }
  header nav a { margin-right: 6px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}