/* ---------- reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  color: #1a1a1a;
  background: #fafafa;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---------- layout ---------- */
.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

main { padding: 2rem 0 4rem; }

/* ---------- header ---------- */
.site-header {
  border-bottom: 1px solid #e5e5e5;
  padding: 1.25rem 0;
  background: #fff;
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.site-title {
  font-weight: 700;
  font-size: 1.15rem;
  color: #111;
  text-decoration: none;
  letter-spacing: -0.01em;
}
.site-nav a {
  color: #666;
  margin-left: 1.25rem;
  text-decoration: none;
  font-size: 0.95rem;
}
.site-nav a:hover { color: #111; }

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid #e5e5e5;
  padding: 1.5rem 0;
  color: #888;
  font-size: 0.9rem;
  background: #fff;
}
.site-footer a { color: #666; text-decoration: none; }
.site-footer a:hover { color: #111; }
.site-footer .sep { margin: 0 0.5rem; color: #ccc; }

/* ---------- home / post list ---------- */
.home-intro {
  padding: 1.5rem 0 2rem;
  border-bottom: 1px solid #e5e5e5;
  margin-bottom: 2rem;
}
.home-intro h1 {
  font-size: 1.8rem;
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}
.home-intro p {
  color: #555;
  margin: 0;
}
.post-list { list-style: none; padding: 0; margin: 0; }
.post-list li {
  padding: 1.25rem 0;
  border-bottom: 1px solid #eee;
}
.post-list li:last-child { border-bottom: none; }
.post-list time {
  display: block;
  color: #888;
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
  margin-bottom: 0.25rem;
}
.post-list h2 {
  font-size: 1.25rem;
  margin: 0 0 0.35rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.post-list h2 a {
  color: #111;
  text-decoration: none;
}
.post-list h2 a:hover { color: #0366d6; }
.post-list .excerpt {
  color: #555;
  margin: 0;
  font-size: 0.95rem;
}

/* ---------- article ---------- */
.post { padding: 0 1.25rem; max-width: 760px; margin: 0 auto; }
.post-header { padding: 1rem 0 2rem; border-bottom: 1px solid #eee; margin-bottom: 2.5rem; }
.post-title {
  font-size: 2rem;
  margin: 0 0 0.5rem;
  line-height: 1.25;
  letter-spacing: -0.02em;
}
.post-meta { color: #888; font-size: 0.9rem; }
.post-meta time { font-variant-numeric: tabular-nums; }
.post-tags { margin-left: 0.75rem; }
.tag {
  display: inline-block;
  padding: 0.1rem 0.55rem;
  margin-right: 0.35rem;
  border-radius: 3px;
  background: #f0f0f0;
  color: #555;
  font-size: 0.78rem;
  font-family: "SF Mono", "Cascadia Code", "Fira Code", Menlo, Consolas, monospace;
}

/* ---------- content typography ---------- */
.post-content { font-size: 1.05rem; }
.post-content h2 {
  font-size: 1.5rem;
  margin: 2.5rem 0 1rem;
  letter-spacing: -0.015em;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid #eee;
}
.post-content h3 {
  font-size: 1.2rem;
  margin: 2rem 0 0.75rem;
  letter-spacing: -0.01em;
}
.post-content p { margin: 0 0 1.1rem; }
.post-content a {
  color: #0366d6;
  text-decoration: none;
  border-bottom: 1px solid rgba(3, 102, 214, 0.25);
}
.post-content a:hover {
  border-bottom-color: #0366d6;
}
.post-content strong { font-weight: 600; }
.post-content em { font-style: italic; }
.post-content hr {
  border: 0;
  border-top: 1px solid #eee;
  margin: 2.5rem 0;
}

/* ---------- lists ---------- */
.post-content ul, .post-content ol { padding-left: 1.5rem; margin: 0 0 1.1rem; }
.post-content li { margin-bottom: 0.35rem; }
.post-content li > p { margin-bottom: 0.5rem; }

/* ---------- inline code / code blocks ---------- */
.post-content code, .post-content pre {
  font-family: "SF Mono", "Cascadia Code", "Fira Code", Menlo, Consolas, monospace;
  font-size: 0.9em;
}
.post-content code {
  background: #f4f4f4;
  padding: 0.1em 0.35em;
  border-radius: 3px;
  border: 1px solid #eaeaea;
}
.post-content pre {
  background: #f6f8fa;
  border: 1px solid #e5e5e5;
  border-radius: 6px;
  padding: 0.9rem 1rem;
  overflow-x: auto;
  line-height: 1.5;
  margin: 0 0 1.25rem;
}
.post-content pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.88rem;
}
.highlight { margin: 0 0 1.25rem; }
.highlight pre { margin: 0; }

/* ---------- blockquotes ---------- */
.post-content blockquote {
  margin: 0 0 1.25rem;
  padding: 0.1rem 1rem;
  border-left: 3px solid #d1d5da;
  color: #586069;
  font-style: italic;
}
.post-content blockquote p:last-child { margin-bottom: 0.5rem; }

/* ---------- tables ---------- */
.post-content table {
  border-collapse: collapse;
  margin: 0 0 1.25rem;
  width: 100%;
  font-size: 0.95rem;
}
.post-content th, .post-content td {
  padding: 0.5rem 0.75rem;
  border: 1px solid #e5e5e5;
  text-align: left;
  vertical-align: top;
}
.post-content th {
  background: #f6f8fa;
  font-weight: 600;
}
.post-content tr:nth-child(even) td { background: #fafafa; }

/* ---------- images ---------- */
.post-content img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  border: 1px solid #eee;
  margin: 0.5rem 0;
  display: block;
}
.post-content figure { margin: 1.5rem 0; }
.post-content figcaption {
  color: #888;
  font-size: 0.9rem;
  margin-top: 0.5rem;
  text-align: center;
  font-style: italic;
}

/* ---------- post nav ---------- */
.post-nav {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid #eee;
}
.post-nav a {
  color: #666;
  text-decoration: none;
  font-size: 0.95rem;
}
.post-nav a:hover { color: #111; }

/* ---------- syntax highlighting (Rouge, light) ---------- */
.highlight .c    { color: #6a737d; font-style: italic; } /* Comment */
.highlight .c1   { color: #6a737d; font-style: italic; }
.highlight .cm   { color: #6a737d; font-style: italic; }
.highlight .cp   { color: #6a737d; font-style: italic; }
.highlight .cs   { color: #6a737d; font-style: italic; font-weight: bold; }
.highlight .k    { color: #d73a49; }                     /* Keyword */
.highlight .kd   { color: #d73a49; }
.highlight .kn   { color: #d73a49; }
.highlight .kp   { color: #d73a49; }
.highlight .kr   { color: #d73a49; }
.highlight .kt   { color: #d73a49; }
.highlight .kc   { color: #005cc5; }
.highlight .s    { color: #032f62; }                     /* String */
.highlight .s1   { color: #032f62; }
.highlight .s2   { color: #032f62; }
.highlight .sb   { color: #032f62; }
.highlight .sc   { color: #032f62; }
.highlight .sd   { color: #032f62; }
.highlight .se   { color: #032f62; }
.highlight .sh   { color: #032f62; }
.highlight .si   { color: #032f62; }
.highlight .sr   { color: #032f62; }
.highlight .ss   { color: #032f62; }
.highlight .sx   { color: #032f62; }
.highlight .mi   { color: #005cc5; }                     /* Number */
.highlight .mf   { color: #005cc5; }
.highlight .mh   { color: #005cc5; }
.highlight .mo   { color: #005cc5; }
.highlight .m    { color: #005cc5; }
.highlight .il   { color: #005cc5; }
.highlight .n    { color: #24292e; }
.highlight .na   { color: #6f42c1; }
.highlight .nb   { color: #005cc5; }
.highlight .nc   { color: #6f42c1; }
.highlight .nd   { color: #6f42c1; }
.highlight .ne   { color: #6f42c1; }
.highlight .nf   { color: #6f42c1; }
.highlight .nl   { color: #24292e; }
.highlight .nn   { color: #24292e; }
.highlight .no   { color: #005cc5; }
.highlight .nt   { color: #22863a; }
.highlight .nv   { color: #24292e; }
.highlight .o    { color: #d73a49; }
.highlight .ow   { color: #d73a49; }
.highlight .p    { color: #24292e; }
.highlight .err  { color: #b31d28; background: #ffeef0; }

/* ---------- dark mode ---------- */
@media (prefers-color-scheme: dark) {
  body {
    background: #0d1117;
    color: #c9d1d9;
  }
  .site-header, .site-footer { background: #161b22; border-color: #21262d; }
  .site-title { color: #f0f6fc; }
  .site-nav a { color: #8b949e; }
  .site-nav a:hover { color: #f0f6fc; }
  .site-footer a { color: #8b949e; }
  .site-footer a:hover { color: #f0f6fc; }
  .site-footer .sep { color: #30363d; }

  .home-intro { border-color: #21262d; }
  .home-intro h1 { color: #f0f6fc; }
  .home-intro p { color: #8b949e; }
  .post-list li { border-color: #21262d; }
  .post-list h2 a { color: #f0f6fc; }
  .post-list h2 a:hover { color: #58a6ff; }
  .post-list time { color: #6e7681; }
  .post-list .excerpt { color: #8b949e; }

  .post-header { border-color: #21262d; }
  .post-title { color: #f0f6fc; }
  .post-meta { color: #6e7681; }
  .tag { background: #21262d; color: #8b949e; }

  .post-content h2, .post-content h3 { color: #f0f6fc; }
  .post-content h2 { border-color: #21262d; }
  .post-content a {
    color: #58a6ff;
    border-bottom-color: rgba(88, 166, 255, 0.3);
  }
  .post-content a:hover { border-bottom-color: #58a6ff; }
  .post-content hr { border-color: #21262d; }

  .post-content code {
    background: #21262d;
    border-color: #30363d;
    color: #c9d1d9;
  }
  .post-content pre {
    background: #161b22;
    border-color: #21262d;
  }
  .post-content blockquote {
    border-left-color: #30363d;
    color: #8b949e;
  }
  .post-content th { background: #161b22; }
  .post-content th, .post-content td { border-color: #21262d; }
  .post-content tr:nth-child(even) td { background: #161b22; }
  .post-content img { border-color: #21262d; }
  .post-content figcaption { color: #8b949e; }

  .post-nav { border-color: #21262d; }
  .post-nav a { color: #8b949e; }
  .post-nav a:hover { color: #f0f6fc; }

  /* Rouge dark palette (One Dark-ish) */
  .highlight .c, .highlight .c1, .highlight .cm, .highlight .cp, .highlight .cs { color: #8b949e; }
  .highlight .k, .highlight .kd, .highlight .kn, .highlight .kp, .highlight .kr, .highlight .kt { color: #ff7b72; }
  .highlight .kc { color: #79c0ff; }
  .highlight .s, .highlight .s1, .highlight .s2, .highlight .sb, .highlight .sc, .highlight .sd,
  .highlight .se, .highlight .sh, .highlight .si, .highlight .sr, .highlight .ss, .highlight .sx { color: #a5d6ff; }
  .highlight .mi, .highlight .mf, .highlight .mh, .highlight .mo, .highlight .m, .highlight .il { color: #79c0ff; }
  .highlight .n { color: #c9d1d9; }
  .highlight .na, .highlight .nc, .highlight .nd, .highlight .ne, .highlight .nf { color: #d2a8ff; }
  .highlight .nb, .highlight .no { color: #79c0ff; }
  .highlight .nt { color: #7ee787; }
  .highlight .o, .highlight .ow { color: #ff7b72; }
  .highlight .p { color: #c9d1d9; }
  .highlight .err { color: #ffa198; background: #490202; }
}

/* ---------- responsive ---------- */
@media (max-width: 600px) {
  body { font-size: 16px; }
  .post-title { font-size: 1.55rem; }
  .post-content h2 { font-size: 1.3rem; }
  .post-content h3 { font-size: 1.1rem; }
}