:root {
  --bg: #0d1117;
  --bg-soft: #161b22;
  --bg-card: #1c2128;
  --border: #30363d;
  --text: #e6edf3;
  --text-dim: #9da7b3;
  --accent: #58a6ff;
  --accent-2: #3fb950;
  --accent-3: #d2a8ff;
  --code-bg: #0d1117;
  --radius: 10px;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
}

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

/* ============ Nav ============ */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1080px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between; height: 60px;
}
.logo { font-family: var(--font-mono); font-weight: 700; font-size: 1.15rem; color: var(--text); }
.logo span { color: var(--accent-2); }
.nav-links { display: flex; gap: 24px; list-style: none; }
.nav-links a { color: var(--text-dim); font-size: 0.95rem; }
.nav-links a:hover { color: var(--text); text-decoration: none; }
.nav-links a.active { color: var(--accent); }

/* ============ Hero ============ */
.hero {
  padding: 88px 24px 64px;
  text-align: center;
  background: radial-gradient(ellipse 80% 60% at 50% -10%, rgba(88, 166, 255, 0.12), transparent);
}
.hero h1 { font-size: 2.6rem; font-weight: 800; letter-spacing: -0.5px; }
.hero .typing {
  margin-top: 16px; font-family: var(--font-mono); font-size: 1.1rem; color: var(--accent-2);
  min-height: 1.7em;
}
.hero .typing::after { content: "▍"; animation: blink 1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }
.hero p.sub { margin-top: 12px; color: var(--text-dim); max-width: 560px; margin-inline: auto; }

/* ============ Container & sections ============ */
.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
section.block { padding: 48px 0; }
h2.section-title {
  font-size: 1.5rem; margin-bottom: 24px; display: flex; align-items: center; gap: 10px;
}
h2.section-title::before {
  content: ""; width: 4px; height: 22px; background: var(--accent); border-radius: 2px;
}

/* ============ Tag filter ============ */
.tag-filter { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 28px; }
.tag-btn {
  background: var(--bg-soft); border: 1px solid var(--border); color: var(--text-dim);
  padding: 6px 14px; border-radius: 999px; cursor: pointer; font-size: 0.85rem;
  transition: all 0.2s;
}
.tag-btn:hover { border-color: var(--accent); color: var(--text); }
.tag-btn.active { background: var(--accent); border-color: var(--accent); color: #0d1117; font-weight: 600; }

/* ============ Cards grid ============ */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 20px; }
.card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px; display: flex; flex-direction: column; gap: 10px;
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}
.card:hover {
  transform: translateY(-3px); border-color: var(--accent);
  box-shadow: 0 8px 24px rgba(88, 166, 255, 0.12);
}
.card .meta { font-size: 0.8rem; color: var(--text-dim); font-family: var(--font-mono); }
.card h3 { font-size: 1.1rem; }
.card h3 a { color: var(--text); }
.card h3 a:hover { color: var(--accent); text-decoration: none; }
.card p.excerpt { color: var(--text-dim); font-size: 0.9rem; flex: 1; }
.card .tags { display: flex; gap: 8px; flex-wrap: wrap; }
.card .tags span {
  font-size: 0.75rem; color: var(--accent); background: rgba(88, 166, 255, 0.1);
  padding: 2px 10px; border-radius: 999px; border: 1px solid rgba(88, 166, 255, 0.25);
}
.card.hidden { display: none; }

/* ============ Article page ============ */
.article-header { padding: 56px 0 32px; }
.article-header .breadcrumb { font-size: 0.85rem; color: var(--text-dim); margin-bottom: 16px; }
.article-header h1 { font-size: 2.1rem; line-height: 1.35; }
.article-header .meta {
  margin-top: 14px; font-size: 0.85rem; color: var(--text-dim); font-family: var(--font-mono);
  display: flex; gap: 16px; flex-wrap: wrap;
}
.article-body { max-width: 780px; margin: 0 auto 80px; font-size: 1.02rem; }
.article-body h2 {
  font-size: 1.45rem; margin: 40px 0 14px; padding-bottom: 8px; border-bottom: 1px solid var(--border);
}
.article-body h3 { font-size: 1.15rem; margin: 28px 0 10px; color: var(--accent-3); }
.article-body p { margin: 12px 0; color: #c9d1d9; }
.article-body ul, .article-body ol { margin: 12px 0 12px 24px; color: #c9d1d9; }
.article-body li { margin: 6px 0; }
.article-body strong { color: var(--text); }
.article-body code {
  background: rgba(110, 118, 129, 0.25); padding: 2px 6px; border-radius: 5px;
  font-family: var(--font-mono); font-size: 0.88em; color: #ffa657;
}
.article-body pre {
  background: var(--code-bg); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px; overflow-x: auto; margin: 16px 0; position: relative;
}
.article-body pre code { background: none; padding: 0; color: var(--text); font-size: 0.88rem; }
.article-body pre::before {
  content: attr(data-lang); position: absolute; top: 8px; right: 14px;
  font-size: 0.7rem; color: var(--text-dim); font-family: var(--font-mono);
  text-transform: uppercase; letter-spacing: 1px;
}
.article-body table {
  width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 0.92rem;
}
.article-body th, .article-body td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.article-body th { background: var(--bg-soft); }
.article-body blockquote {
  border-left: 3px solid var(--accent-2); background: rgba(63, 185, 80, 0.08);
  padding: 10px 16px; margin: 16px 0; border-radius: 0 8px 8px 0; color: var(--text-dim);
}
.article-body blockquote p { margin: 0; color: var(--text-dim); }

/* ============ About ============ */
.about-box {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 32px; display: flex; gap: 24px; align-items: flex-start; flex-wrap: wrap;
}
.about-box .avatar {
  width: 96px; height: 96px; border-radius: 50%; flex-shrink: 0;
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  display: flex; align-items: center; justify-content: center;
  font-size: 2.4rem; font-weight: 800; color: #0d1117;
}
.about-box h3 { margin-bottom: 8px; }
.about-box p { color: var(--text-dim); font-size: 0.95rem; max-width: 640px; }

/* ============ Footer ============ */
footer {
  border-top: 1px solid var(--border); padding: 32px 24px; margin-top: 40px;
  text-align: center; color: var(--text-dim); font-size: 0.85rem;
}
footer .mono { font-family: var(--font-mono); color: var(--accent-2); }

/* ============ Responsive ============ */
@media (max-width: 640px) {
  .hero h1 { font-size: 1.9rem; }
  .nav-links { gap: 14px; }
  .article-header h1 { font-size: 1.6rem; }
}