/* seomoz.link — GEO 引用可见度研究观察
   简洁科技学习指南风：白底、大留白、卡片式、1px 细边框 */
:root {
  --ink: #0c1524;
  --body: #2a3040;
  --muted: #5b6270;
  --line: #e4e6ec;
  --bg: #ffffff;
  --page: #f6f7f9;
  --primary: #0c447c;
  --link: #185fa5;
  --teal: #0f6e56;
  --teal-soft: #e1f5ee;
  --blue-soft: #e6f1fb;
  --amber-soft: #faeeda;
  --amber: #854f0b;
  --mono: Consolas, "SFMono-Regular", Menlo, monospace;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  color: var(--body);
  background: var(--bg);
  line-height: 1.8;
  font-size: 16px;
}
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 1020px; margin: 0 auto; padding: 0 20px; }

/* ---------- 导航 ---------- */
.nav { position: sticky; top: 0; background: rgba(255,255,255,.96); border-bottom: 1px solid var(--line); z-index: 50; }
.nav-inner { display: flex; align-items: center; height: 58px; gap: 26px; }
.logo { font-family: var(--mono); font-weight: 700; font-size: 17px; color: var(--primary); }
.logo .dot { color: var(--teal); }
.nav .tagline { font-size: 12.5px; color: var(--muted); border-left: 1px solid var(--line); padding-left: 14px; }
.nav-links { margin-left: auto; display: flex; gap: 24px; font-size: 14.5px; }
.nav-links a { color: var(--body); }
.nav-links a:hover { color: var(--link); text-decoration: none; }
#nav-toggle { display: none; }
.burger { display: none; font-size: 22px; cursor: pointer; color: var(--primary); margin-left: auto; }

/* ---------- Hero ---------- */
.hero { background: var(--blue-soft); border-bottom: 1px solid var(--line); }
.hero-inner { display: flex; gap: 40px; align-items: center; padding: 58px 0 54px; }
.hero-text { flex: 1.2; }
.kicker { font-family: var(--mono); font-size: 12px; letter-spacing: 2px; color: var(--link); margin-bottom: 14px; }
.hero h1 { font-size: 32px; line-height: 1.35; color: var(--ink); font-weight: 700; margin-bottom: 14px; }
.hero p.sub { font-size: 15.5px; color: var(--muted); margin-bottom: 24px; }
.btn { display: inline-block; padding: 10px 26px; border-radius: 8px; font-size: 14.5px; margin-right: 12px; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--link); text-decoration: none; }
.btn-ghost { border: 1px solid var(--primary); color: var(--primary); }
.btn-ghost:hover { background: #fff; text-decoration: none; }
.hero-art { flex: 1; }
.hero-art img { width: 100%; border-radius: 12px; border: 1px solid var(--line); display: block; }

/* ---------- 区块 ---------- */
section.block { padding: 46px 0 10px; }
.sec-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 20px; }
.sec-head h2 { font-size: 20px; color: var(--ink); font-weight: 700; }
.sec-head a { font-size: 13.5px; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.cards.two { grid-template-columns: repeat(2, 1fr); }
.card { background: var(--bg); border: 1px solid var(--line); border-radius: 10px; padding: 20px 22px; transition: border-color .15s; }
.card:hover { border-color: var(--link); }
.card .meta { font-family: var(--mono); font-size: 11.5px; color: var(--teal); background: var(--teal-soft); display: inline-block; padding: 1px 10px; border-radius: 10px; margin-bottom: 10px; }
.card .meta.blue { color: var(--link); background: var(--blue-soft); }
.card h3 { font-size: 16px; line-height: 1.5; margin-bottom: 8px; }
.card h3 a { color: var(--ink); }
.card p { font-size: 13.5px; color: var(--muted); margin-bottom: 0; }

/* ---------- 文章页 ---------- */
.article { max-width: 760px; margin: 0 auto; padding: 44px 20px 70px; }
.article .kicker { margin-bottom: 10px; }
.article h1 { font-size: 27px; line-height: 1.4; color: var(--ink); font-weight: 700; margin-bottom: 10px; }
.article .post-meta { font-family: var(--mono); font-size: 12.5px; color: var(--muted); margin-bottom: 28px; padding-bottom: 18px; border-bottom: 1px solid var(--line); }
.article h2 { font-size: 19px; color: var(--ink); font-weight: 700; margin: 32px 0 12px; padding-left: 10px; border-left: 4px solid var(--primary); }
.article h3 { font-size: 16px; color: var(--ink); font-weight: 700; margin: 22px 0 8px; }
.article p { margin-bottom: 12px; }
.article ul, .article ol { padding-left: 22px; margin-bottom: 12px; }
.article li { margin-bottom: 6px; }
.article img { max-width: 100%; border-radius: 10px; border: 1px solid var(--line); margin: 8px 0 16px; }
.article table { width: 100%; border-collapse: collapse; font-size: 14px; margin: 14px 0 18px; }
.article th, .article td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; }
.article th { background: var(--blue-soft); color: var(--ink); font-weight: 600; }
.note { border-left: 4px solid var(--amber); background: var(--amber-soft); border-radius: 0 10px 10px 0; padding: 12px 16px; margin: 16px 0; font-size: 14px; }
.note.teal { border-color: var(--teal); background: var(--teal-soft); }
.note.blue { border-color: var(--primary); background: var(--blue-soft); }
code { font-family: var(--mono); font-size: 13.5px; background: var(--blue-soft); color: var(--primary); padding: 1px 6px; border-radius: 4px; }
pre { font-family: var(--mono); font-size: 13px; line-height: 1.7; background: var(--ink); color: #c9e3ff; border-radius: 10px; padding: 16px 18px; overflow-x: auto; margin: 14px 0 18px; }
.backlink { font-size: 13.5px; margin-bottom: 20px; display: inline-block; }

/* ---------- 清单 ---------- */
.checklist { list-style: none; padding-left: 0; }
.checklist li { padding: 9px 0 9px 34px; position: relative; border-bottom: 1px dashed var(--line); font-size: 14.5px; }
.checklist li::before { content: ""; position: absolute; left: 2px; top: 12px; width: 16px; height: 16px; border: 1.5px solid var(--primary); border-radius: 4px; }

/* ---------- 页脚 ---------- */
footer { border-top: 1px solid var(--line); background: var(--page); margin-top: 56px; }
.footer-inner { padding: 26px 0; text-align: center; font-size: 12.5px; color: var(--muted); }
.footer-inner .mono { font-family: var(--mono); }

/* ---------- 响应式 ---------- */
@media (max-width: 760px) {
  .hero-inner { flex-direction: column-reverse; padding: 40px 0; text-align: left; }
  .hero h1 { font-size: 25px; }
  .cards, .cards.two { grid-template-columns: 1fr; }
  .nav .tagline { display: none; }
  .burger { display: block; }
  .nav-links { display: none; position: absolute; top: 58px; left: 0; right: 0; background: #fff; flex-direction: column; padding: 16px 24px; border-bottom: 1px solid var(--line); gap: 16px; }
  #nav-toggle:checked ~ .nav-links { display: flex; }
}