:root {
  --bg: #0a0e14;
  --bg-soft: #0f1520;
  --panel: #111a27;
  --border: #1e2b3d;
  --text: #dbe4f0;
  --text-dim: #8aa0b8;
  --accent: #4dd0ff;
  --accent-2: #7ee0a3;
  --warn: #ffb86b;
  --code-bg: #0b111b;
  --radius: 12px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

nav {
  position: sticky; top: 0; z-index: 10;
  background: rgba(10, 14, 20, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; padding: 14px 24px; max-width: 1080px; margin: 0 auto; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 16px; color: var(--text); }
.brand .dot { width: 10px; height: 10px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 10px var(--accent); }
.nav-links { display: flex; gap: 20px; align-items: center; font-size: 14px; }
.nav-links a { color: var(--text-dim); }
.nav-links a:hover { color: var(--text); text-decoration: none; }

/* ---------- blog index ---------- */
.blog-head { max-width: 860px; margin: 0 auto; padding: 56px 24px 8px; }
.blog-head h1 { font-size: 34px; font-weight: 800; letter-spacing: -0.5px; }
.blog-head .desc { color: var(--text-dim); margin-top: 10px; }
.post-list { max-width: 860px; margin: 0 auto; padding: 28px 24px 80px; }
.post {
  display: block; padding: 20px 4px; border-bottom: 1px solid var(--border);
  color: var(--text); transition: background 0.15s;
}
.post:hover { background: var(--panel); text-decoration: none; border-radius: var(--radius); padding-left: 16px; padding-right: 16px; }
.post h2 { font-size: 20px; font-weight: 700; color: var(--text); }
.post:hover h2 { color: var(--accent); }
.post .meta { color: var(--text-dim); font-size: 13px; margin-top: 6px; }
.post .excerpt { color: var(--text-dim); font-size: 15px; margin-top: 8px; }
.lang { color: var(--accent-2); font-size: 12px; margin-left: 8px; border: 1px solid var(--border); padding: 1px 6px; border-radius: 999px; }

/* ---------- article ---------- */
.article { max-width: 760px; margin: 0 auto; padding: 56px 24px 80px; }
.article h1 { font-size: 32px; font-weight: 800; letter-spacing: -0.5px; line-height: 1.4; margin-bottom: 12px; }
.meta { color: var(--text-dim); font-size: 13px; margin-bottom: 8px; }
.subtitle { color: var(--accent-2); font-size: 14px; margin-bottom: 40px; }
.article h2 { font-size: 22px; font-weight: 700; margin: 44px 0 16px; letter-spacing: -0.3px; }
.article h3 { font-size: 18px; font-weight: 700; margin: 32px 0 12px; }
.article p { margin: 14px 0; }
.article ul, .article ol { margin: 14px 0 14px 24px; }
.article li { margin: 8px 0; }
.article strong { color: #fff; }
.article table { border-collapse: collapse; margin: 16px 0; width: 100%; font-size: 14px; }
.article th, .article td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.article th { background: var(--panel); }
.article blockquote {
  margin: 20px 0; padding: 14px 20px;
  border-left: 3px solid var(--accent);
  background: var(--panel); border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text-dim); font-size: 15px;
}
.article code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88em; padding: 2px 6px; border-radius: 6px;
  background: var(--code-bg); border: 1px solid var(--border);
  color: var(--accent-2);
}
.article pre {
  margin: 20px 0; padding: 16px 20px; overflow-x: auto;
  background: var(--code-bg); border: 1px solid var(--border); border-radius: var(--radius);
}
.article pre code { background: none; border: none; padding: 0; color: var(--text); }
.article .tagline { font-style: italic; color: var(--warn); }
.article .related { margin-top: 48px; padding: 16px 20px; background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); font-size: 14px; }
.cta { margin-top: 48px; padding: 20px; background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); text-align: center; }
.cta .btn {
  display: inline-block; margin: 8px 6px 0; padding: 10px 22px; border-radius: 999px;
  background: var(--accent); color: #0a0e14; font-weight: 700; font-size: 14px;
}
.cta .btn.ghost { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.cta .btn:hover { text-decoration: none; filter: brightness(1.08); }
footer { border-top: 1px solid var(--border); padding: 24px; text-align: center; color: var(--text-dim); font-size: 13px; }
@media (max-width: 640px) { .article h1, .blog-head h1 { font-size: 25px; } .article, .blog-head { padding-top: 36px; } }