/* 程序员炒股指南 — shared stylesheet (light, cozy) */
:root {
  --page: #f3eee3;
  --surface: #faf6ec;
  --ink: #3b352b;
  --ink-2: #6b6355;
  --muted: #97907f;
  --grid: #e4ddcd;
  --baseline: #cec5b1;
  --border: rgba(74, 63, 53, 0.12);
  --accent: #48709e;      /* muted blue */
  --accent-deep: #3a5c84;
  --s1: #2a78d6; --s2: #eb6834; --s3: #1baf7a; --s4: #eda100;
  --s5: #e87ba4; --s6: #008300; --s7: #4a3aa7; --s8: #e34948;
  --good: #0ca30c; --warn: #fab219; --serious: #ec835a; --critical: #d03b3b;
  --radius: 14px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.85;
  font-size: 17px;
}
a { color: var(--accent-deep); text-decoration: none; }
a:hover { text-decoration: underline; }

.site-header {
  max-width: 760px; margin: 0 auto; padding: 22px 20px 0;
  font-size: 14px; color: var(--muted);
  display: flex; justify-content: space-between; align-items: baseline; gap: 12px;
}
.site-header a { color: var(--ink-2); }

main { max-width: 760px; margin: 0 auto; padding: 8px 20px 40px; }

.chapter-head { margin: 28px 0 6px; }
.chapter-head .kicker { font-size: 14px; color: var(--accent-deep); font-weight: 600; letter-spacing: .06em; }
h1 { font-size: 34px; line-height: 1.3; margin: 6px 0 8px; letter-spacing: .01em; }
.lede { font-size: 18px; color: var(--ink-2); margin: 0 0 10px; }
h2 { font-size: 24px; margin: 44px 0 10px; line-height: 1.4; }
h2 .h-num { color: var(--baseline); font-weight: 600; margin-right: 8px; font-variant-numeric: tabular-nums; }
h3 { font-size: 18px; margin: 28px 0 8px; }
p { margin: 12px 0; }
ul, ol { padding-left: 1.4em; }
li { margin: 6px 0; }
strong { font-weight: 650; }
hr { border: none; border-top: 1px solid var(--grid); margin: 36px 0; }

code, pre {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: .88em;
}
code { background: #ece5d4; padding: 2px 6px; border-radius: 6px; }
pre {
  background: #ece5d4; border-radius: 10px; padding: 14px 16px;
  overflow-x: auto; line-height: 1.6;
}
pre code { background: none; padding: 0; }

/* 程序员视角 callout */
.analogy {
  background: #e9eef1; border: 1px solid #d5dee3; border-radius: var(--radius);
  padding: 14px 18px; margin: 20px 0; font-size: 16px;
}
.analogy .tag {
  display: block; font-size: 13px; font-weight: 700; color: var(--accent-deep);
  letter-spacing: .08em; margin-bottom: 4px;
}
.callout {
  background: #f6ecdc; border: 1px solid #e9dbc2; border-radius: var(--radius);
  padding: 14px 18px; margin: 20px 0; font-size: 16px;
}
.callout .tag {
  display: block; font-size: 13px; font-weight: 700; color: #9c5a24;
  letter-spacing: .08em; margin-bottom: 4px;
}

/* figures */
figure {
  margin: 26px 0; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px 18px 12px;
}
figure svg { display: block; max-width: 100%; height: auto; margin: 0 auto; }
figcaption {
  font-size: 14px; color: var(--muted); margin-top: 10px; text-align: center; line-height: 1.6;
}
.fig-title { font-size: 15px; font-weight: 650; color: var(--ink-2); margin: 0 0 10px; }

/* tables */
.table-wrap { overflow-x: auto; margin: 22px 0; }
table {
  border-collapse: collapse; width: 100%; font-size: 15px;
  background: var(--surface); border-radius: 10px; overflow: hidden;
}
th, td { padding: 9px 12px; border-bottom: 1px solid var(--grid); text-align: left; vertical-align: top; }
th { font-size: 13.5px; color: var(--ink-2); font-weight: 650; background: #f0ead9; white-space: nowrap; }
tr:last-child td { border-bottom: none; }
td .num { font-variant-numeric: tabular-nums; }

/* chapter prev/next nav */
.chapter-nav {
  max-width: 760px; margin: 0 auto; padding: 0 20px 30px;
  display: flex; justify-content: space-between; gap: 14px; font-size: 15px;
}
.chapter-nav a {
  flex: 1; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 12px 16px; color: var(--ink-2);
}
.chapter-nav a:hover { text-decoration: none; border-color: var(--accent); color: var(--accent-deep); }
.chapter-nav .dir { display: block; font-size: 12.5px; color: var(--muted); }
.chapter-nav .next { text-align: right; }
.chapter-nav .spacer { flex: 1; visibility: hidden; }

.site-footer {
  max-width: 760px; margin: 0 auto; padding: 0 20px 46px;
  font-size: 13.5px; color: var(--muted); text-align: center; line-height: 1.7;
}

/* ===== TOC page ===== */
.toc-hero { text-align: center; margin: 40px 0 30px; }
.toc-hero h1 { font-size: 40px; margin: 10px 0 6px; }
.toc-hero .sub { color: var(--ink-2); font-size: 17px; max-width: 560px; margin: 0 auto; }
.toc-hero .badge {
  display: inline-block; font-size: 13px; color: var(--accent-deep);
  background: #e9eef1; border: 1px solid #d5dee3; border-radius: 99px;
  padding: 3px 14px; letter-spacing: .1em; font-weight: 600;
}
.toc-list { list-style: none; padding: 0; margin: 26px 0; display: grid; gap: 12px; }
.toc-list .ch a, .toc-list .ch.pending .inner {
  display: flex; gap: 16px; align-items: baseline;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px 20px; color: var(--ink);
}
.toc-list .ch a:hover { text-decoration: none; border-color: var(--accent); box-shadow: 0 4px 14px rgba(74,63,53,.10); }
.toc-list .num {
  font-variant-numeric: tabular-nums; font-weight: 700; color: var(--accent-deep);
  font-size: 20px; min-width: 34px;
}
.toc-list .t { font-size: 18px; font-weight: 650; }
.toc-list .d { font-size: 14.5px; color: var(--ink-2); margin-top: 2px; line-height: 1.6; }
.toc-list .ch.pending .inner { opacity: .55; }
.toc-list .ch.pending .num { color: var(--muted); }
.toc-list .soon {
  font-size: 12.5px; color: var(--muted); border: 1px dashed var(--baseline);
  border-radius: 99px; padding: 1px 10px; white-space: nowrap; margin-left: auto;
}
.pdf-download { text-align: center; margin: 34px 0 10px; }
.pdf-download a {
  display: inline-block; background: var(--surface); border: 1px solid var(--border);
  border-radius: 99px; padding: 10px 26px; font-weight: 650; font-size: 16px;
}
.pdf-download a:hover { text-decoration: none; border-color: var(--accent); box-shadow: 0 4px 14px rgba(74,63,53,.10); }
.pdf-download .pdf-size { display: block; font-size: 13px; color: var(--muted); margin-top: 8px; }

@media (max-width: 560px) {
  h1 { font-size: 28px; }
  .toc-hero h1 { font-size: 30px; }
  body { font-size: 16px; }
}