/* Blog static-page styles. Loaded only by pre-rendered HTML under /blog/*.
 * Intentionally self-contained — no dependency on the React app's stylesheet
 * so blog pages work even if the main bundle fails to load. */

:root {
  --blog-fg: #111418;
  --blog-fg-soft: #2b2f36;
  --blog-fg-muted: #6b7280;
  --blog-bg: #ffffff;
  --blog-bg-alt: #f7f7f8;
  --blog-border: #e5e7eb;
  --blog-accent: #111111;
  --blog-link: #0366d6;
  --blog-code-bg: #f6f8fa;
  --blog-max-width: 760px;
  --blog-wide-width: 1120px;
  --blog-sidebar-width: 240px;
  --blog-font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue",
    Arial, sans-serif;
  --blog-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--blog-bg);
  color: var(--blog-fg);
  font-family: var(--blog-font);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-size-adjust: 100%;
}

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

/* ── Header ───────────────────────────────────────────── */

.blog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid var(--blog-border);
  background: var(--blog-bg);
  position: sticky;
  top: 0;
  z-index: 10;
}

.blog-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--blog-fg);
}
.blog-brand:hover { text-decoration: none; }

.blog-brand-mark {
  display: inline-block;
  padding: 4px 8px;
  background: var(--blog-accent);
  color: #fff;
  border-radius: 4px;
  font-family: var(--blog-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.02em;
}

.blog-brand-name {
  font-weight: 600;
  font-size: 15px;
}

.blog-nav {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 14px;
}
.blog-nav a {
  color: var(--blog-fg);
}
.blog-nav .blog-lang {
  border: 1px solid var(--blog-border);
  padding: 4px 10px;
  border-radius: 4px;
}

/* ── Main + hero ───────────────────────────────────────── */

.blog-main {
  max-width: var(--blog-max-width);
  margin: 0 auto;
  padding: 48px 24px 80px;
}

.blog-main-wide {
  max-width: var(--blog-wide-width);
}

.blog-layout {
  display: grid;
  grid-template-columns: var(--blog-sidebar-width) minmax(0, 1fr);
  gap: 56px;
  align-items: start;
}

.blog-hero h1 {
  font-size: 38px;
  margin: 0 0 8px;
  letter-spacing: -0.015em;
}
.blog-hero p {
  color: var(--blog-fg-muted);
  margin: 0 0 32px;
}

/* ── Sidebar ──────────────────────────────────────────── */

.blog-sidebar {
  font-size: 14px;
}

.blog-sidebar-sticky {
  position: sticky;
  top: 88px;
}

.blog-sidebar-title {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--blog-fg-muted);
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--blog-border);
  letter-spacing: 0.08em;
}

.blog-sidebar-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.blog-sidebar-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--blog-border);
  line-height: 1.45;
}
.blog-sidebar-list li:last-child {
  border-bottom: none;
}

.blog-sidebar-list a {
  color: var(--blog-fg-soft);
  display: block;
  font-size: 13.5px;
}
.blog-sidebar-list a:hover {
  color: var(--blog-accent);
  text-decoration: none;
}

.blog-sidebar-list li.active a {
  color: var(--blog-accent);
  font-weight: 600;
}
.blog-sidebar-list li.active {
  position: relative;
}
.blog-sidebar-list li.active::before {
  content: "";
  position: absolute;
  left: -14px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  background: var(--blog-accent);
  border-radius: 1px;
}

.blog-empty {
  padding: 24px;
  background: var(--blog-bg-alt);
  border: 1px solid var(--blog-border);
  border-radius: 6px;
  color: var(--blog-fg-muted);
}

/* ── Index list ───────────────────────────────────────── */

.blog-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.blog-list-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--blog-border);
}
.blog-list-item:last-child { border-bottom: none; }

.blog-list-link {
  display: block;
  color: var(--blog-fg);
}
.blog-list-link:hover {
  text-decoration: none;
  background: var(--blog-bg-alt);
  margin: 0 -16px;
  padding: 20px 16px;
  border-radius: 6px;
}
.blog-list-link h2 {
  font-size: 20px;
  margin: 0 0 4px;
}
.blog-list-link p {
  margin: 8px 0 0;
  color: var(--blog-fg-muted);
  font-size: 15px;
}

.blog-meta {
  font-size: 13px;
  color: var(--blog-fg-muted);
  font-family: var(--blog-mono);
}

/* ── Article typography ───────────────────────────────── */

.blog-article {
  min-width: 0; /* allow grid cell to shrink; prevents overflow from wide code blocks */
  max-width: var(--blog-max-width);
}

.blog-article-title {
  font-size: 40px;
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin: 0 0 14px;
  color: var(--blog-fg);
}

.blog-article-meta {
  margin-bottom: 40px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* Lede — the first paragraph after the meta gets larger, softer treatment */
.blog-article-meta + p {
  font-size: 18.5px;
  line-height: 1.72;
  color: var(--blog-fg-soft);
  margin: 0 0 28px;
}

.blog-article h2 {
  font-size: 26px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin: 56px 0 18px;
  padding-top: 20px;
  border-top: 1px solid var(--blog-border);
}
.blog-article h3 {
  font-size: 20px;
  font-weight: 600;
  margin: 36px 0 12px;
}
.blog-article p {
  margin: 18px 0;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--blog-fg-soft);
}
.blog-article ul,
.blog-article ol {
  padding-left: 24px;
}
.blog-article li { margin: 6px 0; }

.blog-article blockquote {
  margin: 20px 0;
  padding: 12px 20px;
  border-left: 4px solid var(--blog-border);
  background: var(--blog-bg-alt);
  color: var(--blog-fg-muted);
}

.blog-article code {
  font-family: var(--blog-mono);
  font-size: 14px;
  background: var(--blog-code-bg);
  padding: 2px 6px;
  border-radius: 3px;
}

.blog-article pre {
  margin: 20px 0;
  padding: 16px 20px;
  background: #0d1117;
  color: #c9d1d9;
  border-radius: 6px;
  overflow-x: auto;
  line-height: 1.5;
}
.blog-article pre code {
  background: transparent;
  padding: 0;
  color: inherit;
  font-size: 13.5px;
}

.blog-article table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 14px;
}
.blog-article th,
.blog-article td {
  padding: 10px 14px;
  border: 1px solid var(--blog-border);
  text-align: left;
}
.blog-article th {
  background: var(--blog-bg-alt);
  font-weight: 600;
}

.blog-article img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 24px auto;
}

/* ── Footer ───────────────────────────────────────────── */

.blog-footer {
  max-width: var(--blog-max-width);
  margin: 0 auto;
  padding: 32px 24px 48px;
  border-top: 1px solid var(--blog-border);
  color: var(--blog-fg-muted);
  font-size: 14px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.blog-footer-links {
  display: flex;
  gap: 16px;
}
.blog-footer-links a { color: var(--blog-fg-muted); }

/* ── highlight.js GitHub-dark subset ──────────────────── */

.hljs { background: #0d1117; color: #c9d1d9; }
.hljs-comment, .hljs-quote { color: #8b949e; font-style: italic; }
.hljs-keyword, .hljs-selector-tag, .hljs-literal { color: #ff7b72; }
.hljs-string, .hljs-attr, .hljs-meta .hljs-string { color: #a5d6ff; }
.hljs-number, .hljs-symbol, .hljs-bullet { color: #79c0ff; }
.hljs-title, .hljs-section, .hljs-name { color: #d2a8ff; }
.hljs-built_in, .hljs-builtin-name { color: #ffa657; }
.hljs-type { color: #ff7b72; }
.hljs-variable, .hljs-template-variable { color: #c9d1d9; }
.hljs-regexp { color: #a5d6ff; }
.hljs-deletion { background: #3c1618; color: #ffdcd7; }
.hljs-addition { background: #0f2e1e; color: #aff5b4; }

/* ── Responsive ───────────────────────────────────────── */

@media (max-width: 960px) {
  .blog-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .blog-sidebar-sticky {
    position: static;
  }
  .blog-sidebar {
    border-bottom: 1px solid var(--blog-border);
    padding-bottom: 24px;
    margin-bottom: 12px;
  }
}

@media (max-width: 640px) {
  .blog-header { padding: 12px 16px; }
  .blog-nav { gap: 12px; font-size: 13px; }
  .blog-main { padding: 32px 16px 60px; }
  .blog-hero h1 { font-size: 28px; }
  .blog-article-title { font-size: 28px; }
  .blog-article-meta + p { font-size: 17px; }
  .blog-article h2 { font-size: 21px; margin-top: 40px; }
  .blog-article h3 { font-size: 18px; }
  .blog-article p { font-size: 16px; }
  .blog-footer { padding: 24px 16px 40px; flex-direction: column; }
}