@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;500;600;700&family=Noto+Serif+JP:wght@500;600;700&display=swap');

:root {
  --color-ink: #1a1c1a;
  --color-body: #33372f;
  --color-muted: #5c6259;
  --color-accent: #52705a;
  --color-accent-dark: #2d4533;
  --color-paper: #ffffff;
  --color-wash: #f9f8f5;
  --color-beige: #efeae5;
  --color-line: #d8d5cd;
  --color-caution-bg: #fbf7f0;
  --color-caution-line: #a98157;
  --color-urgent: #704329;
  --font-heading: 'Noto Serif JP', 'Hiragino Mincho ProN', 'Yu Mincho', serif;
  --font-body: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Yu Gothic', sans-serif;
  --content-width: 864px;
  --reading-width: 660px;
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-paper);
  color: var(--color-body);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-accent-dark);
  text-underline-offset: 0.2em;
  text-decoration-thickness: 1px;
}

a:hover {
  color: var(--color-accent);
}

a:focus-visible {
  outline: 3px solid #d09c54;
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 20;
  top: 10px;
  left: 10px;
  padding: 10px 14px;
  transform: translateY(-160%);
  background: var(--color-paper);
  border: 2px solid var(--color-accent-dark);
  color: var(--color-ink);
  font-weight: 700;
}

.skip-link:focus {
  transform: translateY(0);
}

.preview-strip {
  padding: 9px 20px;
  background: var(--color-accent-dark);
  color: #ffffff;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.5;
  text-align: center;
}

.site-header {
  display: flex;
  width: min(calc(100% - 44px), var(--content-width));
  min-height: 74px;
  margin: 0 auto;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border-bottom: 1px solid var(--color-line);
}

.site-name {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-decoration: none;
}

.site-section {
  margin: 0;
  padding-left: 18px;
  border-left: 1px solid var(--color-line);
  color: var(--color-muted);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.hero {
  width: min(calc(100% - 44px), var(--content-width));
  margin: 0 auto;
  padding: 30px 0 42px;
  animation: hero-enter 500ms ease-out both;
}

.breadcrumb {
  margin: 0 0 24px;
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.7;
}

.breadcrumb ol {
  display: flex;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
  list-style: none;
}

.breadcrumb a {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
}

.breadcrumb li + li::before {
  margin: 0 0.55em;
  color: var(--color-line);
  content: '／';
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 190px;
  align-items: center;
  gap: 42px;
  padding: 42px 48px 38px;
  background: var(--color-wash);
  border-top: 3px solid var(--color-accent);
  border-bottom: 1px solid var(--color-line);
}

.category-label {
  margin: 0 0 14px;
  color: var(--color-accent-dark);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

h1,
h2,
h3 {
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-weight: 600;
  text-wrap: balance;
}

h1 {
  margin: 0;
  font-size: clamp(32px, 4.6vw, 46px);
  letter-spacing: 0.035em;
  line-height: 1.42;
}

.hero-lead {
  margin: 22px 0 0;
  font-size: 16px;
  line-height: 2;
}

.article-meta {
  display: flex;
  margin: 24px 0 0;
  flex-wrap: wrap;
  gap: 7px 18px;
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.6;
}

.hero-figure {
  display: grid;
  min-height: 230px;
  margin: 0;
  place-items: end center;
  overflow: hidden;
  background: var(--color-beige);
  border: 1px solid var(--color-line);
}

.hero-figure img {
  width: auto;
  max-height: 230px;
  object-fit: contain;
  object-position: center bottom;
}

.guide-index {
  width: min(calc(100% - 44px), var(--content-width));
  margin: 0 auto;
}

.guide-index-intro {
  padding: 42px 48px;
  background: var(--color-wash);
  border-top: 3px solid var(--color-accent);
  border-bottom: 1px solid var(--color-line);
}

.guide-index-intro > .hero-lead {
  max-width: 660px;
  margin-bottom: 0;
}

.guide-jump {
  margin-top: 30px;
  padding-top: 24px;
  border-top: 1px solid var(--color-line);
}

.guide-jump p {
  margin: 0 0 12px;
  color: var(--color-muted);
  font-size: 15px;
  font-weight: 700;
}

.guide-jump ul {
  display: grid;
  margin: 0;
  padding: 0;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--color-line);
  border-left: 1px solid var(--color-line);
  list-style: none;
}

.guide-jump a {
  display: flex;
  min-height: 48px;
  padding: 10px 12px;
  align-items: center;
  justify-content: center;
  background: var(--color-paper);
  border-right: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  font-size: 15px;
  font-weight: 700;
  text-align: center;
  text-decoration: none;
}

.guide-jump a:hover {
  background: var(--color-beige);
}

.guide-groups {
  margin-top: 56px;
}

.guide-group {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  gap: 34px;
  padding: 38px 0;
  border-top: 1px solid var(--color-line);
}

.guide-group:last-child {
  border-bottom: 1px solid var(--color-line);
}

.guide-group-heading {
  margin: 0;
  color: var(--color-accent-dark);
  font-size: 20px;
  line-height: 1.6;
}

.guide-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.guide-list li + li {
  border-top: 1px solid var(--color-line);
}

.guide-card {
  display: grid;
  min-height: 142px;
  padding: 18px 0;
  grid-template-columns: 104px minmax(0, 1fr) 28px;
  align-items: center;
  gap: 24px;
  color: var(--color-body);
  text-decoration: none;
}

.guide-card:hover .guide-card-title {
  color: var(--color-accent);
}

.guide-card::after {
  color: var(--color-accent);
  content: '\2192';
  font-size: 24px;
  text-align: right;
}

.guide-card-image {
  display: grid;
  width: 104px;
  height: 104px;
  place-items: end center;
  overflow: hidden;
  background: var(--color-beige);
  border: 1px solid var(--color-line);
}

.guide-card-image img {
  width: auto;
  max-height: 100px;
  object-fit: contain;
  object-position: center bottom;
}

.guide-card-kind {
  display: block;
  margin-bottom: 5px;
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.guide-card-title {
  display: block;
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-size: 21px;
  font-weight: 600;
  line-height: 1.55;
}

.guide-index-note {
  margin: 48px 0 0;
  padding: 24px 26px;
  background: var(--color-beige);
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  font-size: 15px;
}

.page-layout {
  display: grid;
  width: min(calc(100% - 44px), var(--content-width));
  margin: 0 auto;
  grid-template-columns: minmax(0, var(--reading-width)) minmax(150px, 1fr);
  align-items: start;
  gap: 52px;
}

.page-note-wrap {
  display: grid;
  width: min(calc(100% - 44px), var(--content-width));
  margin: 0 auto 52px;
  grid-template-columns: minmax(0, var(--reading-width)) minmax(150px, 1fr);
  gap: 52px;
}

.article {
  grid-column: 1;
  grid-row: 1;
  min-width: 0;
}

.page-note {
  margin: 0;
  padding: 24px 26px;
  background: var(--color-beige);
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}

.page-note h2 {
  margin: 0 0 9px;
  font-size: 18px;
  letter-spacing: 0.03em;
}

.page-note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
}

.toc {
  position: sticky;
  top: 22px;
  grid-column: 2;
  grid-row: 1;
  padding-top: 12px;
  border-top: 2px solid var(--color-accent);
}

.toc-title {
  margin: 0 0 12px;
  color: var(--color-muted);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.toc ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.toc li + li {
  border-top: 1px solid var(--color-line);
}

.toc a {
  display: flex;
  min-height: 48px;
  padding: 10px 0;
  align-items: center;
  color: var(--color-body);
  font-size: 15px;
  line-height: 1.55;
  text-decoration: none;
}

.content-section {
  padding: 0 0 58px;
  scroll-margin-top: 28px;
}

.content-section + .content-section {
  padding-top: 52px;
  border-top: 1px solid var(--color-line);
}

.section-kicker {
  margin: 0 0 9px;
  color: var(--color-accent);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

h2 {
  margin: 0 0 24px;
  font-size: 29px;
  letter-spacing: 0.04em;
  line-height: 1.55;
}

h3 {
  margin: 34px 0 14px;
  font-size: 20px;
  letter-spacing: 0.025em;
  line-height: 1.65;
}

p {
  margin: 0 0 20px;
}

.article ul,
.article ol {
  margin: 20px 0;
  padding-left: 1.45em;
}

.article li {
  padding-left: 0.25em;
}

.article li + li {
  margin-top: 9px;
}

.source-ref {
  display: inline-flex;
  min-width: 48px;
  min-height: 48px;
  margin: -9px 1px;
  padding: 4px;
  align-items: center;
  justify-content: center;
  font-size: 0.78em;
  font-weight: 700;
  line-height: 1;
  text-align: center;
  text-decoration: none;
  vertical-align: super;
}

.decision-path {
  margin: 28px 0 0;
  border-top: 1px solid var(--color-caution-line);
  border-bottom: 1px solid var(--color-caution-line);
}

.decision-block {
  padding: 26px 28px 28px;
  background: var(--color-caution-bg);
}

.decision-block + .decision-block {
  border-top: 1px solid #dfcbb6;
}

.decision-block--urgent {
  background: #f7eee8;
}

.decision-label {
  margin: 0 0 8px;
  color: var(--color-urgent);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.decision-block h3 {
  margin: 0 0 13px;
  font-size: 21px;
}

.decision-block p:last-child,
.decision-block ul:last-child {
  margin-bottom: 0;
}

.evidence-box {
  margin: 26px 0;
  padding: 26px 28px;
  background: var(--color-wash);
  border-top: 2px solid var(--color-accent);
  border-bottom: 1px solid var(--color-line);
}

.evidence-box p:last-child {
  margin-bottom: 0;
}

.numbered-guidance {
  display: grid;
  margin: 26px 0;
  padding: 0;
  gap: 0;
  list-style: none;
  counter-reset: guidance;
}

.numbered-guidance li {
  display: grid;
  padding: 20px 0;
  grid-template-columns: 42px minmax(0, 1fr);
  align-items: start;
  gap: 14px;
  border-top: 1px solid var(--color-line);
  counter-increment: guidance;
}

.numbered-guidance li:last-child {
  border-bottom: 1px solid var(--color-line);
}

.numbered-guidance li::before {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid var(--color-accent);
  color: var(--color-accent-dark);
  content: counter(guidance, cjk-ideographic);
  font-family: var(--font-heading);
  font-size: 15px;
  line-height: 1;
}

.numbered-guidance strong {
  display: block;
  margin-bottom: 4px;
  color: var(--color-ink);
}

.small-note {
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.8;
}

.article-details {
  margin: 6px 0 28px;
  padding: 16px 0;
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.8;
}

.source-list {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: sources;
}

.source-list li {
  position: relative;
  padding: 14px 0 14px 34px;
  border-top: 1px solid var(--color-line);
  counter-increment: sources;
}

.source-list li:last-child {
  border-bottom: 1px solid var(--color-line);
}

.source-list li::before {
  position: absolute;
  top: 15px;
  left: 0;
  color: var(--color-accent-dark);
  content: '[' counter(sources) ']';
  font-size: 15px;
  font-weight: 700;
}

.source-list a {
  display: inline-flex;
  min-height: 48px;
  padding: 6px 0;
  align-items: center;
  overflow-wrap: anywhere;
}

.related-guide {
  margin-top: 8px;
  padding: 28px 0;
  border-top: 3px solid var(--color-accent);
  border-bottom: 1px solid var(--color-line);
}

.related-guide p {
  margin: 0 0 10px;
  color: var(--color-muted);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.related-guide a {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 600;
  line-height: 1.55;
  text-decoration: none;
}

.related-guide a::after {
  margin-left: 12px;
  color: var(--color-accent);
  content: '→';
}

.site-footer {
  width: min(calc(100% - 44px), var(--content-width));
  margin: 72px auto 0;
  padding: 28px 0 42px;
  border-top: 1px solid var(--color-line);
  color: var(--color-muted);
  font-size: 15px;
  letter-spacing: 0.04em;
  text-align: center;
}

@keyframes hero-enter {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 760px) {
  body {
    font-size: 16px;
    line-height: 1.88;
  }

  .site-header,
  .hero,
  .page-note-wrap,
  .page-layout,
  .site-footer {
    width: min(calc(100% - 44px), var(--content-width));
  }

  .site-header {
    min-height: 66px;
  }

  .site-name {
    font-size: 17px;
  }

  .site-section {
    padding-left: 12px;
    font-size: 15px;
  }

  .hero {
    padding: 22px 0 32px;
  }

  .breadcrumb {
    margin-bottom: 17px;
    font-size: 15px;
  }

  .hero-grid {
    grid-template-columns: minmax(0, 1fr) 126px;
    gap: 18px;
    padding: 30px 26px 28px;
  }

  h1 {
    font-size: clamp(28px, 8vw, 35px);
    line-height: 1.48;
  }

  .hero-lead {
    margin-top: 18px;
    font-size: 15px;
    line-height: 1.88;
  }

  .article-meta {
    margin-top: 18px;
    gap: 4px 12px;
  }

  .hero-figure {
    min-height: 180px;
  }

  .hero-figure img {
    max-height: 180px;
  }

  .guide-index-intro {
    padding: 32px 28px;
  }

  .guide-jump ul {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .guide-group {
    grid-template-columns: 1fr;
    gap: 14px;
    padding: 32px 0;
  }

  .guide-card {
    grid-template-columns: 88px minmax(0, 1fr) 22px;
    gap: 18px;
  }

  .guide-card-image {
    width: 88px;
    height: 94px;
  }

  .guide-card-image img {
    max-height: 90px;
  }

  .page-note-wrap {
    display: block;
    margin-bottom: 42px;
  }

  .page-layout {
    display: flex;
    flex-direction: column;
    align-items: stretch;
  }

  .toc {
    position: static;
    margin: 0 0 48px;
    padding: 18px 22px;
    background: var(--color-wash);
    border-top-width: 2px;
    border-bottom: 1px solid var(--color-line);
  }

  .toc a {
    min-height: 48px;
  }

  .page-note {
    padding: 21px 22px;
  }

  .content-section {
    padding-bottom: 46px;
  }

  .content-section + .content-section {
    padding-top: 42px;
  }

  h2 {
    margin-bottom: 20px;
    font-size: 24px;
    line-height: 1.6;
  }

  h3 {
    font-size: 19px;
  }

  .decision-block,
  .evidence-box {
    padding: 22px;
  }

  .decision-block h3 {
    font-size: 20px;
  }

  .related-guide a {
    font-size: 18px;
  }
}

@media (max-width: 520px) {
  .preview-strip {
    padding: 8px 16px;
    font-size: 15px;
  }

  .site-header {
    display: block;
    padding: 8px 0 10px;
  }

  .site-name {
    min-height: 48px;
  }

  .site-section {
    padding: 0;
    border-left: 0;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    padding: 28px 22px 0;
  }

  .hero-figure {
    width: calc(100% + 44px);
    min-height: 185px;
    margin-left: -22px;
    border-right: 0;
    border-bottom: 0;
    border-left: 0;
  }

  .hero-figure img {
    max-height: 185px;
  }

  .guide-index-intro {
    padding: 28px 22px;
  }

  .guide-card {
    min-height: 124px;
    grid-template-columns: 76px minmax(0, 1fr) 18px;
    gap: 14px;
  }

  .guide-card-image {
    width: 76px;
    height: 86px;
  }

  .guide-card-image img {
    max-height: 82px;
  }

  .guide-card-title {
    font-size: 18px;
  }

  .article-meta {
    display: block;
    margin-bottom: 24px;
  }

  .article-meta span {
    display: block;
  }

  .page-note,
  .toc,
  .decision-block,
  .evidence-box {
    margin-right: -4px;
    margin-left: -4px;
  }

  .numbered-guidance li {
    grid-template-columns: 36px minmax(0, 1fr);
    gap: 10px;
  }

  .numbered-guidance li::before {
    width: 30px;
    height: 30px;
    font-size: 15px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hero {
    animation: none;
  }
}