/* 電生理教材 e-book stylesheet (shared by HTML / EPUB / PDF) */
:root {
  --ink: #1d1d1f;
  --muted: #5b5b60;
  --accent: #0b4f8a;
  --accent-soft: #e8f1fa;
  --warn-soft: #fff4e0;
  --warn: #b35c00;
  --line: #d8d8dc;
  --bg: #ffffff;
}
html { font-size: 17px; }
body {
  margin: 0 auto;
  padding: 24px 20px 80px;
  max-width: 880px;
  color: var(--ink);
  background: var(--bg);
  font-family: "Noto Sans CJK TC", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", "WenQuanYi Zen Hei", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.85;
  letter-spacing: 0.01em;
  -webkit-text-size-adjust: 100%;
}
h1, h2, h3, h4 { line-height: 1.35; color: var(--accent); font-weight: 700; }
h1 { font-size: 1.9rem; margin: 2.2em 0 0.8em; border-bottom: 3px solid var(--accent); padding-bottom: 0.3em; }
h2 { font-size: 1.4rem; margin: 1.8em 0 0.6em; border-left: 6px solid var(--accent); padding-left: 0.5em; }
h3 { font-size: 1.15rem; margin: 1.4em 0 0.5em; }
h4 { font-size: 1.02rem; margin: 1.2em 0 0.4em; color: var(--ink); }
p { margin: 0.7em 0; text-align: justify; }
ul, ol { padding-left: 1.6em; }
li { margin: 0.25em 0; }
strong { color: #000; }
code { font-family: "SFMono-Regular", Menlo, Consolas, monospace; font-size: 0.92em; background: #f4f4f6; padding: 0 0.25em; border-radius: 3px; }
table { border-collapse: collapse; width: 100%; margin: 1em 0; font-size: 0.93rem; line-height: 1.5; }
th, td { border: 1px solid var(--line); padding: 0.45em 0.6em; vertical-align: top; text-align: left; }
th { background: var(--accent-soft); color: var(--accent); }
tr:nth-child(even) td { background: #fafafa; }
blockquote {
  margin: 1.2em 0; padding: 0.8em 1.1em;
  background: var(--accent-soft); border-left: 5px solid var(--accent); border-radius: 4px;
}
blockquote p { margin: 0.35em 0; text-align: left; }
hr { border: 0; border-top: 1px solid var(--line); margin: 2em 0; }
.box-key { background: var(--warn-soft); border-left: 5px solid var(--warn); padding: 0.8em 1.1em; margin: 1.2em 0; border-radius: 4px; }
.box-key p { margin: 0.35em 0; text-align: left; }
.qa-question ul { list-style: none; padding-left: 0.6em; }
.qa-question ul li { margin: 0.35em 0; }
sub { font-size: 0.75em; line-height: 0; }
.qa-question { border: 1px solid var(--line); border-radius: 6px; padding: 0.9em 1.1em; margin: 1.2em 0; background: #fcfcfd; }
.qa-answer { border-left: 5px solid #2a7d4f; background: #eef8f1; padding: 0.8em 1.1em; margin: 1em 0 1.6em; border-radius: 4px; }
.qa-answer-line { font-weight: 700; color: #1f5f3b; }
.front { text-align: center; padding: 3em 0 2em; }
.front h1 { border: 0; font-size: 2.3rem; margin-bottom: 0.2em; }
.front .subtitle { font-size: 1.15rem; color: var(--muted); }
.front .meta { color: var(--muted); font-size: 0.95rem; margin-top: 2em; }
nav.toc { margin: 1.5em 0 2.5em; padding: 1em 1.2em; border: 1px solid var(--line); border-radius: 6px; background: #fafbfc; }
nav.toc h2 { border: 0; padding: 0; margin: 0 0 0.5em; }
nav.toc ul { margin: 0.3em 0; padding-left: 1.2em; list-style: none; }
nav.toc .part { font-weight: 700; color: var(--accent); margin-top: 0.6em; margin-left: -1.2em; }
nav.toc a { color: var(--ink); text-decoration: none; }
nav.toc a:hover { text-decoration: underline; }
a { color: var(--accent); }
.chapter { page-break-before: always; break-before: page; }
.small { font-size: 0.9rem; color: var(--muted); }
@media print {
  html { font-size: 11.5pt; }
  body { max-width: none; padding: 0; }
  h1 { page-break-before: always; break-before: page; }
  .front h1, nav.toc h2 { page-break-before: auto; break-before: auto; }
  table, blockquote, .box-key, .qa-question, .qa-answer { page-break-inside: avoid; break-inside: avoid; }
  a { color: inherit; text-decoration: none; }
}