:root {
  --bg: #0b0d10;
  --bg-soft: #12151a;
  --bg-card: #161a21;
  --border: #232a34;
  --text: #e6e9ef;
  --text-dim: #8b95a5;
  --accent: #4ade80;
  --accent-dim: #22c55e;
  --warn: #fbbf24;
  --danger: #f87171;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

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

code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1em 0.4em;
  word-break: break-all;
}

pre {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  overflow-x: auto;
}
pre code { background: none; border: none; padding: 0; }

/* ------------------------------------------------------------ 布局 */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(11, 13, 16, 0.9);
  backdrop-filter: blur(12px);
  z-index: 10;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}
.brand:hover { text-decoration: none; }
.brand-mark { color: var(--accent); font-size: 1.2em; }

.site-header nav { display: flex; gap: 1.25rem; font-size: 0.95rem; }
.site-header nav a { color: var(--text-dim); }
.site-header nav a:hover { color: var(--text); text-decoration: none; }

main { max-width: 860px; margin: 0 auto; padding: 2.5rem 1.5rem 4rem; }

.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 1.5rem 3rem;
  text-align: center;
  font-size: 0.875rem;
  color: var(--text-dim);
}
.site-footer p { margin: 0.4rem 0; }
.muted { color: var(--text-dim); }

/* ------------------------------------------------------------ Hero */
.hero { padding: 2rem 0 3rem; border-bottom: 1px solid var(--border); }

.hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
}

.lead { font-size: 1.0625rem; color: var(--text-dim); margin: 0 0 2rem; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-bottom: 2.5rem; }

.btn {
  display: inline-block;
  padding: 0.6rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
  background: var(--bg-card);
  transition: all 0.15s;
}
.btn:hover { border-color: var(--text-dim); text-decoration: none; }
.btn.primary {
  background: var(--accent-dim);
  border-color: var(--accent-dim);
  color: #052e16;
  font-weight: 600;
}
.btn.primary:hover { background: var(--accent); border-color: var(--accent); }

.hero-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1.5rem;
  list-style: none;
  padding: 0;
  margin: 0;
}
.hero-facts li { display: flex; flex-direction: column; gap: 0.15rem; }
.hero-facts strong {
  font-family: var(--mono);
  font-size: 1.25rem;
  color: var(--accent);
}
.hero-facts span { font-size: 0.8125rem; color: var(--text-dim); }

/* ------------------------------------------------------------ 文章列表 */
.posts { padding-top: 3rem; }
.posts h2 { font-size: 1.25rem; letter-spacing: -0.01em; margin: 0 0 0.5rem; }
.section-note { color: var(--text-dim); font-size: 0.9375rem; margin: 0 0 1.75rem; }

.grid { display: grid; gap: 1rem; }

.card {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-card);
  padding: 1.25rem;
  transition: border-color 0.15s, transform 0.15s;
}
.card:hover { border-color: var(--text-dim); transform: translateY(-2px); }
.card h3 { margin: 0 0 0.5rem; font-size: 1.0625rem; line-height: 1.45; }
.card h3 a { color: var(--text); }
.card h3 a:hover { color: var(--accent); text-decoration: none; }
.excerpt { margin: 0 0 0.85rem; color: var(--text-dim); font-size: 0.9375rem; }

.meta, .post-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8125rem;
  color: var(--text-dim);
  margin: 0;
}
.tag {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.1rem 0.6rem;
  font-size: 0.75rem;
}

/* ------------------------------------------------------------ 文章正文 */
.post { max-width: 720px; }
.crumbs { font-size: 0.875rem; margin-bottom: 1.5rem; }
.post h1 {
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  line-height: 1.35;
  letter-spacing: -0.02em;
  margin: 0 0 0.75rem;
}
.post h2 {
  font-size: 1.25rem;
  margin: 2.5rem 0 0.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}
.post h3 { font-size: 1.0625rem; margin: 1.75rem 0 0.5rem; }
.post p { margin: 0 0 1rem; }
.post ul, .post ol { margin: 0 0 1rem; padding-left: 1.5rem; }
.post li { margin-bottom: 0.35rem; }
.post blockquote {
  margin: 0 0 1rem;
  padding: 0.75rem 1rem;
  border-left: 2px solid var(--accent-dim);
  background: var(--bg-soft);
  color: var(--text-dim);
  border-radius: 0 6px 6px 0;
}
.post hr { border: none; border-top: 1px solid var(--border); margin: 2rem 0; }

.table-wrap { overflow-x: auto; margin: 0 0 1.25rem; }
.post table { width: 100%; border-collapse: collapse; font-size: 0.9375rem; }
.post th, .post td {
  text-align: left;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
}
.post th { color: var(--text-dim); font-weight: 500; font-size: 0.875rem; }

/* ------------------------------------------------------------ CTA */
.cta {
  margin: 3rem 0 0;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-card);
  text-align: center;
}
.cta p { margin: 0 0 0.5rem; }
.cta p:last-child { margin: 0.75rem 0 0; }

/* ------------------------------------------------------------ 定价 */
.plans {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0 2.5rem;
}
.plan {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-card);
  padding: 1.5rem 1.25rem;
  display: flex;
  flex-direction: column;
}
.plan.featured { border-color: var(--accent-dim); position: relative; }
.badge {
  position: absolute;
  top: -0.7rem;
  left: 1.25rem;
  background: var(--accent-dim);
  color: #052e16;
  font-size: 0.6875rem;
  font-weight: 700;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  margin: 0;
}
.plan h3 { margin: 0 0 0.25rem; font-size: 1rem; }
.plan .price {
  font-family: var(--mono);
  font-size: 1.75rem;
  font-weight: 700;
  margin: 0 0 1rem;
}
.plan .price span { font-size: 0.875rem; font-weight: 400; color: var(--text-dim); }
.plan ul {
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem;
  font-size: 0.9375rem;
  color: var(--text-dim);
  flex: 1;
}
.plan ul li { margin-bottom: 0.5rem; padding-left: 1.1rem; position: relative; }
.plan ul li::before {
  content: "·";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}
.plan .btn { text-align: center; }

@media (max-width: 600px) {
  main { padding: 1.5rem 1rem 3rem; }
  .site-header { padding: 0.85rem 1rem; }
  .site-header nav { gap: 0.9rem; font-size: 0.875rem; }
  .hero { padding: 1rem 0 2rem; }
}