@page {
  size: A4;
  margin: 16mm 16mm 18mm;
}

@page problems {
  size: A4;
  margin: 16mm 16mm 18mm;

  @bottom-center {
    content: "問題編 - " counter(page) "ページ";
    color: #4b5563;
    font-size: 9pt;
  }
}

@page answers {
  size: A4;
  margin: 16mm 16mm 18mm;

  @bottom-center {
    content: "解答編 - " counter(page) "ページ";
    color: #4b5563;
    font-size: 9pt;
  }
}

:root {
  color-scheme: light;
  font-family: "Noto Sans CJK JP", "Noto Sans JP", "Hiragino Kaku Gothic ProN",
    "Yu Gothic", "Meiryo", sans-serif;
  line-height: 1.65;
}

* {
  box-sizing: border-box;
}

body {
  max-width: 176mm;
  margin: 0 auto;
  background: #ffffff;
  color: #111827;
  font-size: 11pt;
}

body.atomic-problems {
  page: problems;
}

body.atomic-answers {
  page: answers;
}

#title-block-header {
  border: 1.2pt solid #d5dce7;
  margin-block: 0 14mm;
  min-height: 210mm;
  padding: 36mm 24mm;
}

#title-block-header .title {
  border: 0;
  color: #7a3f13;
  font-size: 31pt;
  line-height: 1.25;
  margin-block: 0 12mm;
}

#title-block-header .subtitle {
  color: #536176;
  font-size: 15pt;
  margin: 0;
}

h1 {
  border-bottom: 1.6pt solid #111827;
  font-size: 20pt;
  line-height: 1.3;
  margin-block: 0 8mm;
  padding-bottom: 3mm;
}

#title-block-header + h1 {
  break-before: page;
}

h2 {
  border-bottom: 0.8pt solid #cbd5e1;
  color: #1f4e7d;
  font-size: 15pt;
  line-height: 1.35;
  margin-block: 10mm 4mm;
  padding-bottom: 1.8mm;
}

h3 {
  border: 0.8pt solid #cbd5e1;
  border-radius: 5px;
  color: #163f66;
  font-size: 13pt;
  line-height: 1.35;
  margin-block: 6mm 3mm;
  padding: 2.5mm 3mm;
}

h4 {
  font-size: 11.5pt;
  margin-block: 4mm 2mm;
}

p,
ul,
ol,
table {
  margin-block: 0 3mm;
}

ul,
ol {
  padding-inline-start: 7mm;
}

li + li {
  margin-top: 1mm;
}

table {
  border-collapse: collapse;
  width: 100%;
}

th,
td {
  border: 0.6pt solid #cbd5e1;
  padding: 1.5mm 2mm;
}

th {
  background: #f3f6fa;
}

math[display="block"] {
  display: block;
  font-size: 15pt;
  margin-block: 3mm;
  text-align: center;
}

h4 + ul,
h4 + ol {
  background: #f6f7f9;
  border: 0.8pt solid #e1e4e8;
  border-radius: 7px;
  list-style-position: inside;
  padding: 3mm 5mm;
}

strong {
  font-weight: 800;
}

@media print {
  body {
    max-width: none;
  }

  a {
    color: inherit;
    text-decoration: none;
  }
}