:root {
  --bg: #0d1117;
  --bg-card: #161b22;
  --border: #30363d;
  --text: #e6edf3;
  --text-dim: #8b949e;
  --prose: #c9d1d9;
  --accent: #58a6ff;
  --accent-2: #3fb950;
  --max-w: 780px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }

/* ===== Nav ===== */
.nav {
  position: sticky; top: 0; z-index: 20;
  background: rgba(13,17,23,.82); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav .container { display: flex; align-items: center; justify-content: space-between; height: 56px; }
.nav .brand { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; color: var(--text); font-weight: 600; }
.nav .brand:hover { text-decoration: none; }
.nav .brand .p { color: var(--accent-2); }
.nav-links a { color: var(--text-dim); margin-left: 20px; font-size: .9rem; }
.nav-links a:hover { color: var(--text); text-decoration: none; }
@media (max-width: 520px) { .nav-links a { margin-left: 14px; } }

/* ===== Hero ===== */
header.container { padding: 40px 24px 60px; }
.hero-banner {
  display: block; width: 100%; height: auto; border-radius: 16px;
  border: 1px solid var(--border); margin-bottom: 40px;
  box-shadow: 0 12px 40px rgba(0,0,0,.4);
}
.kicker { color: var(--accent-2); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .9rem; margin-bottom: 14px; }
h1 { font-size: clamp(2.2rem, 6vw, 3.4rem); line-height: 1.12; letter-spacing: -.02em; }
.subtitle { font-size: clamp(1.05rem, 2.6vw, 1.3rem); color: var(--text-dim); margin-top: 12px; }
.summary { margin-top: 24px; max-width: 600px; color: var(--text-dim); }
.summary strong { color: var(--text); font-weight: 600; }
.creds { margin-top: 16px; color: var(--text-dim); font-size: .82rem; font-family: ui-monospace, monospace; }
.hero-links { margin-top: 30px; display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-block; padding: 9px 18px; border-radius: 8px;
  border: 1px solid var(--border); color: var(--text); font-size: .92rem;
}
.btn:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #0d1117; font-weight: 600; }
.btn.primary:hover { filter: brightness(1.1); color: #0d1117; }

/* ===== Sections ===== */
section { padding: 52px 0; border-top: 1px solid var(--border); }
h2 { font-size: 1.35rem; margin-bottom: 26px; display: flex; align-items: center; gap: 10px; }
section h2::before { content: "§"; color: var(--accent-2); font-family: ui-monospace, monospace; }
.section-head { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 26px; }
.section-head h2 { margin-bottom: 0; }
.section-head .more { color: var(--text-dim); font-size: .85rem; font-family: ui-monospace, monospace; white-space: nowrap; }
.section-head .more:hover { color: var(--accent); }

/* ===== Focus cards ===== */
.focus-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 16px; }
.focus { background: var(--bg-card); border: 1px solid var(--border); border-radius: 10px; padding: 20px; }
.focus h3 { font-size: 1rem; margin-bottom: 8px; }
.focus p { color: var(--text-dim); font-size: .88rem; }

/* ===== Projects ===== */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 10px;
  padding: 18px; display: flex; flex-direction: column; gap: 8px;
  transition: border-color .15s ease, transform .15s ease;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); text-decoration: none; }
.card h3 { font-size: 1rem; display: flex; justify-content: space-between; align-items: baseline; }
.card .stars { color: #e3b341; font-size: .82rem; font-weight: 400; white-space: nowrap; }
.card p { color: var(--text-dim); font-size: .88rem; flex: 1; }
.card .stack { color: var(--accent-2); font-size: .78rem; font-family: ui-monospace, monospace; }
.card .read { color: var(--accent); font-size: .82rem; font-family: ui-monospace, monospace; margin-top: 4px; }

/* ===== Writing list ===== */
.posts { list-style: none; }
.post-item { display: flex; gap: 22px; padding: 18px 0; border-bottom: 1px solid var(--border); }
.post-item:last-child { border-bottom: none; }
.post-item time { color: var(--text-dim); font-family: ui-monospace, monospace; font-size: .82rem; white-space: nowrap; min-width: 96px; padding-top: 2px; }
.post-item h3 { font-size: 1.02rem; }
.post-item h3 a { color: var(--text); }
.post-item h3 a:hover { color: var(--accent); text-decoration: none; }
.post-item p { color: var(--text-dim); font-size: .88rem; margin-top: 4px; }
.post-item .tags { margin-top: 6px; font-family: ui-monospace, monospace; font-size: .75rem; color: var(--accent-2); }
@media (max-width: 560px) { .post-item { flex-direction: column; gap: 4px; } }

/* ===== Page header (blog index) ===== */
.page-header { padding: 44px 24px 8px; }

/* ===== Article ===== */
.article { padding: 44px 24px 72px; }
.back { display: inline-block; margin-bottom: 26px; color: var(--text-dim); font-family: ui-monospace, monospace; font-size: .88rem; }
.article-header h1 { font-size: clamp(1.8rem, 5vw, 2.6rem); }
.article-meta { color: var(--text-dim); font-family: ui-monospace, monospace; font-size: .85rem; margin-top: 12px; }
.article-meta .tag { color: var(--accent-2); }
.prose { margin-top: 34px; }
.prose > * + * { margin-top: 16px; }
.prose h2 { font-size: 1.4rem; margin: 38px 0 4px; display: block; }
.prose h3 { font-size: 1.14rem; margin: 30px 0 2px; }
.prose p, .prose li { color: var(--prose); }
.prose ul, .prose ol { margin-left: 22px; }
.prose li { margin-top: 6px; }
.prose a { text-decoration: underline; }
.prose strong { color: var(--text); }
.prose code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .88em;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 5px; padding: 1px 6px;
}
.prose pre {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 10px;
  padding: 16px 18px; overflow: auto; font-size: .86rem; line-height: 1.5;
}
.prose pre code { background: none; border: none; padding: 0; font-size: 1em; }
.prose blockquote { border-left: 3px solid var(--accent); padding: 2px 16px; color: var(--text-dim); }
.prose img { max-width: 100%; height: auto; border-radius: 10px; border: 1px solid var(--border); }
.prose hr { border: none; border-top: 1px solid var(--border); margin: 32px 0; }

/* ===== Footer ===== */
footer { border-top: 1px solid var(--border); padding: 40px 0 56px; color: var(--text-dim); font-size: .88rem; }
footer .container { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }

/* ===== Reveal on scroll (progressive enhancement) ===== */
.js .reveal { opacity: 0; transform: translateY(14px); transition: opacity .5s ease, transform .5s ease; }
.js .reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .js .reveal { opacity: 1; transform: none; transition: none; } }