:root {
  --primary: #3b6ef5;
  --primary-dark: #2b55c4;
  --ink: #1f2937;
  --muted: #6b7280;
  --bg: #f7f8fc;
  --card: #ffffff;
  --line: #e5e7eb;
  --radius: 14px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.8;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }

.container { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.nav { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.nav .logo { font-size: 20px; font-weight: 800; color: var(--ink); }
.nav .logo span { color: var(--primary); }
.nav .menu { display: flex; gap: 24px; }
.nav .menu a { color: var(--muted); font-size: 15px; }
.nav .menu a:hover { color: var(--primary); }

.article-wrap { max-width: 780px; margin: 0 auto; padding: 36px 20px 60px; }

.article-head .meta { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.article-head .lang {
  font-size: 12px; color: var(--primary); background: #eaf0ff;
  padding: 3px 12px; border-radius: 999px; font-weight: 600;
}
.article-head .date { font-size: 14px; color: var(--muted); }
.article-head h1 { font-size: 30px; line-height: 1.45; }
.article-head .desc { color: var(--muted); margin-top: 12px; font-size: 16px; }

.article-body { margin-top: 26px; }
.article-body h2 {
  font-size: 21px; margin: 34px 0 12px; padding-left: 12px;
  border-left: 4px solid var(--primary);
}
.article-body h3 { font-size: 17px; margin: 22px 0 8px; }
.article-body p { color: #374151; margin: 10px 0; }
.article-body ul, .article-body ol { margin: 10px 0 10px 24px; color: #374151; }
.article-body li { margin: 6px 0; }
.article-body code.inline {
  background: #eef2f8; color: var(--primary-dark); padding: 1px 6px;
  border-radius: 4px; font-size: 0.88em; font-family: Consolas, Monaco, monospace;
}
.article-body pre {
  background: #1e2a38; color: #d6e2f0; padding: 16px; border-radius: 10px;
  overflow-x: auto; font-size: 14px; line-height: 1.65;
  font-family: Consolas, Monaco, "Courier New", monospace; margin: 14px 0;
}
.tip {
  background: #eef4ff; border-left: 4px solid var(--primary);
  padding: 12px 16px; border-radius: 6px; color: #31456e; font-size: 14px; margin: 14px 0;
}
.back { display: inline-block; margin: 20px 0; font-size: 14px; }

footer {
  border-top: 1px solid var(--line); background: #fff; padding: 36px 20px;
  text-align: center; color: var(--muted); font-size: 14px;
}
footer .beian { margin-top: 8px; }
footer .beian a { color: var(--muted); }
footer .beian a:hover { color: var(--primary); }

/* ---------- 分享页清单卡片 ---------- */
.card-list { display: grid; gap: 14px; margin: 16px 0; }

.card-item {
  background: #fff; border: 1px solid var(--line);
  border-radius: 10px; padding: 16px 18px;
}

.card-item h3 { margin: 0 0 6px; font-size: 16px; }
.card-item p { margin: 0; font-size: 14px; color: var(--muted); }

@media (max-width: 560px) {
  .article-head h1 { font-size: 24px; }
}