/* ─── Design Tokens ──────────────────────────────────────────────────── */
:root {
  /* ─── デザイン仕様トークン（forest green テーマ） ─────────────────── */
  --color-bg:            #F8F7F3;
  --color-surface:       #FFFFFF;
  --color-accent:        #2D8860;
  --color-accent-pale:   #E6F4EE;
  --color-accent-dark:   #1E6445;

  --color-text:          #1A2E24;
  --color-text-muted:    #3A5E4E;
  --color-text-faint:    #607A70;
  --color-border:        #B8D8C8;
  --color-border-light:  #D4ECE0;

  --color-tag-bg:        #E2F2EB;
  --color-tag-text:      #1A5040;

  --hero-bg-from:        #1A3828;
  --hero-bg-to:          #0C1E14;

  --color-updated:        #2D8860;
  --color-updated-pale:   #E6F4EE;
  --color-not-updated:    #708A7A;
  --color-not-updated-bg: #F2F6F4;

  --color-completed-bg:     #F5F5F2;
  --color-completed-border: #C8C8BE;
  --color-completed-dot:    #9EA89A;

  --font-main: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Yu Gothic', sans-serif;
  --font-mono: 'Roboto Mono', 'Courier New', monospace;

  --header-h:  60px;
  --sidebar-w: 220px;

  /* ─── 互換エイリアス（フェーズ5-B で削除予定） ────────────────────── */
  --color-primary:      var(--color-accent-dark);
  --color-primary-mid:  var(--color-accent);
  --color-primary-pale: var(--color-accent-pale);
  --color-bg-card:      var(--color-surface);
  --color-bg-subtle:    #F2F0EA;
  --font-serif:         var(--font-main);
  --font-sans:          var(--font-main);

  /* ─── 構造系トークン（温存） ──────────────────────────────────────── */
  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  16px;

  --shadow-card:  0 1px 3px rgba(0,0,0,.06), 0 4px 16px rgba(0,0,0,.04);
  --shadow-hover: 0 4px 12px rgba(30,100,69,.10), 0 8px 32px rgba(30,100,69,.06);

  --max-width:      860px;
  --max-width-wide: 1200px;
}

/* ─── Reset ──────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.8;
  min-height: 100vh;
}

img { max-width: 100%; display: block; }
a { color: inherit; }

/* ─── Typography ─────────────────────────────────────────────────────── */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  line-height: 1.4;
  letter-spacing: .01em;
}

p { margin-block: .75rem; }
p:first-child { margin-top: 0; }

/* ─── Header ─────────────────────────────────────────────────────────── */
.site-header {
  background: var(--color-surface);
  border-bottom: 2px solid var(--color-accent);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 4px rgba(0,0,0,.08);
}

.site-header__inner {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: .85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-header__brand {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: var(--color-text);
}

.site-header__brand-label {
  font-size: .65rem;
  letter-spacing: .12em;
  color: var(--color-accent);
  font-weight: 700;
  text-transform: uppercase;
}

.site-header__brand-name {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: .03em;
  line-height: 1.2;
}

.site-nav {
  display: flex;
  flex: 1;
  justify-content: flex-end;
  gap: 1.5rem;
  list-style: none;
}

.site-nav a {
  text-decoration: none;
  font-size: .82rem;
  font-weight: 700;
  padding: .4rem 0;
  border-bottom: 2px solid transparent;
  color: var(--color-text-muted);
  transition: color .15s, border-color .15s;
  letter-spacing: .02em;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--color-accent-dark);
  border-bottom-color: var(--color-accent);
}

/* ─── Nav wrapper & hamburger ────────────────────────────────────────── */
.site-nav-wrap {
  display: flex;
  align-items: center;
  gap: .5rem;
  position: relative;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 0;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  transition: background .15s, border-color .15s;
  flex-shrink: 0;
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  background: var(--color-accent-pale);
  border-color: var(--color-accent);
  outline: none;
}

.nav-toggle__bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text-muted);
  border-radius: 1px;
  transition: transform .2s ease, opacity .15s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ─── Footer ─────────────────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 2.5rem 1.5rem;
  text-align: center;
  color: var(--color-text-faint);
  font-size: .78rem;
  margin-top: 4rem;
}

.site-footer a {
  color: var(--color-primary-mid);
  text-decoration: none;
}
.site-footer a:hover { text-decoration: underline; }

/* ─── Layout Utilities ───────────────────────────────────────────────── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container--wide {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.page-header {
  padding: 3rem 0 2rem;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 2.5rem;
}

.page-title {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-family: var(--font-serif);
  color: var(--color-primary);
  margin-bottom: .5rem;
}

.page-subtitle {
  color: var(--color-text-muted);
  font-size: .9rem;
}

/* ─── Report Card ────────────────────────────────────────────────────── */
.report-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-decoration: none;
  display: block;
  transition: transform .2s, box-shadow .2s, border-color .2s;
  box-shadow: var(--shadow-card);
}

.report-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-primary-mid);
}

.report-card__meta {
  display: flex;
  align-items: center;
  gap: .75rem;
  margin-bottom: .75rem;
}

.report-card__issue {
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--color-accent);
  text-transform: uppercase;
}

.report-card__period {
  font-size: .75rem;
  color: var(--color-text-faint);
}

.report-card__title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.45;
  margin-bottom: .6rem;
}

.report-card__desc {
  font-size: .83rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: .85rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.report-card__highlights {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: .3rem;
  margin-bottom: .85rem;
}

.report-card__highlights li {
  font-size: .78rem;
  color: var(--color-text-muted);
  padding-left: 1rem;
  position: relative;
}

.report-card__highlights li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-size: .65rem;
  top: .1em;
}

.report-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
}

/* ─── Tags / Category Pills ──────────────────────────────────────────── */
.tag {
  display: inline-block;
  font-size: .68rem;
  padding: .2rem .6rem;
  border-radius: var(--radius-sm);
  font-weight: 500;
  letter-spacing: .03em;
  background: var(--color-primary-pale);
  color: var(--color-primary);
}

/* ─── Report Content ─────────────────────────────────────────────────── */
.report-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 2.5rem;
  align-items: start;
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 1.5rem;
}

@media (max-width: 760px) {
  .report-layout {
    grid-template-columns: 1fr;
  }
  .report-toc {
    display: none;
  }
}

.report-toc {
  position: sticky;
  top: 80px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  font-size: .8rem;
}

.report-toc__title {
  font-size: .7rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  font-weight: 700;
  margin-bottom: .85rem;
}

.report-toc ol {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: .35rem;
  counter-reset: toc;
}

.report-toc li {
  counter-increment: toc;
}

.report-toc a {
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: .78rem;
  display: flex;
  align-items: baseline;
  gap: .4rem;
  transition: color .15s;
  line-height: 1.5;
}

.report-toc a::before {
  content: counter(toc);
  font-size: .65rem;
  font-weight: 700;
  color: var(--color-accent);
  min-width: 1rem;
  flex-shrink: 0;
}

.report-toc a:hover { color: var(--color-primary); }

/* ─── Report Body Prose ──────────────────────────────────────────────── */
.prose {
  color: var(--color-text);
  font-size: .95rem;
  line-height: 1.9;
  min-width: 0;           /* グリッドセルからのはみ出しを防ぐ */
  overflow-wrap: break-word;
  word-break: break-word;
}

.prose h2 {
  font-size: 1.4rem;
  color: var(--color-primary);
  margin-top: 3rem;
  margin-bottom: 1rem;
  padding-bottom: .5rem;
  border-bottom: 2px solid var(--color-primary-pale);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .5rem;
}

.prose h3 {
  font-size: 1.1rem;
  color: var(--color-text);
  margin-top: 2rem;
  margin-bottom: .75rem;
}

.prose h4 {
  font-size: .95rem;
  color: var(--color-primary-mid);
  margin-top: 1.5rem;
  margin-bottom: .5rem;
  font-family: var(--font-sans);
  font-weight: 700;
}

/* ─── Topic Card（主要トピック章の各トピック） ───────────────────── */
.prose .topic-card {
  border: 1px solid var(--color-border-light);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
}

.prose .topic-card:last-of-type { margin-bottom: 0; }

.prose .topic-card-header {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.prose .topic-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 4px;
  background: var(--color-accent-pale);
  color: var(--color-accent-dark);
  font-size: 0.7rem;
  font-weight: 900;
  flex-shrink: 0;
  margin-top: 0.15rem;
}

.prose .topic-title {
  font-size: 0.96rem;
  font-weight: 900;
  color: var(--color-text);
  line-height: 1.5;
  flex: 1;
  /* reset inherited h3 margins */
  margin: 0;
}

.prose .topic-body {
  font-size: 0.88rem;
  line-height: 1.85;
  color: var(--color-text-muted);
  text-align: justify;
  margin: 0;
}

.prose .topic-source {
  font-size: 0.72rem;
  color: var(--color-text-faint);
  margin-top: 0.75rem;
  margin-bottom: 0;
}

.prose ul, .prose ol {
  padding-left: 1.5rem;
  margin-block: .75rem;
}

.prose li { margin-block: .3rem; }

.prose a {
  color: var(--color-primary-mid);
  text-decoration: underline;
  text-decoration-color: var(--color-primary-pale);
  text-underline-offset: .2em;
  transition: text-decoration-color .15s;
}

.prose a:hover {
  text-decoration-color: var(--color-primary-mid);
}

/* 前提知識ミニ解説ブロック */
.prose blockquote {
  background: var(--color-primary-pale);
  border-left: 3px solid var(--color-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 1rem 1.25rem;
  margin-block: 1.25rem;
  font-size: .88rem;
  color: var(--color-primary);
  overflow-wrap: break-word;
  word-break: break-word;
}

.prose blockquote strong {
  display: block;
  font-size: .72rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  margin-bottom: .35rem;
  opacity: .7;
}

/* テーブル */
.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: .85rem;
  margin-block: 1.25rem;
  overflow-x: auto;
  display: block;
}

.prose thead th {
  background: var(--color-primary);
  color: #fff;
  padding: .6rem .85rem;
  text-align: left;
  font-weight: 600;
  font-size: .8rem;
  letter-spacing: .03em;
  white-space: nowrap;
}

.prose tbody tr {
  border-bottom: 1px solid var(--color-border-light);
}

.prose tbody tr:nth-child(even) {
  background: var(--color-bg-subtle);
}

.prose tbody td {
  padding: .6rem .85rem;
  vertical-align: top;
  line-height: 1.65;
}

/* コード */
.prose code {
  font-family: var(--font-mono);
  font-size: .83em;
  background: var(--color-bg-subtle);
  padding: .15em .4em;
  border-radius: var(--radius-sm);
  color: var(--color-accent);
}

/* ─── Highlight Box（今週のハイライト） ──────────────────────────────── */
.highlight-box {
  background: linear-gradient(135deg, var(--color-primary) 0%, #1A6B4A 100%);
  border-radius: var(--radius-lg);
  padding: 2rem 2.25rem;
  margin-bottom: 2.5rem;
  color: #fff;
}

.highlight-box__label {
  font-size: .7rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  opacity: .7;
  margin-bottom: .75rem;
  font-weight: 700;
}

.highlight-box__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: .6rem;
}

.highlight-box__list li {
  display: flex;
  align-items: baseline;
  gap: .6rem;
  font-size: .92rem;
  line-height: 1.6;
}

.highlight-box__list li::before {
  content: '◆';
  color: var(--color-accent);
  font-size: .65rem;
  flex-shrink: 0;
}

/* ─── Hero Banner (トップページ) ─────────────────────────────────────── */
.hero {
  background: linear-gradient(160deg, var(--color-primary) 0%, #0A3226 60%, #051A13 100%);
  color: #fff;
  padding: 4rem 1.5rem 3rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
}

.hero__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  position: relative;
}

.hero__eyebrow {
  font-size: .72rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--color-accent);
  font-weight: 700;
  margin-bottom: 1rem;
}

.hero__title {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 1.25rem;
  letter-spacing: .02em;
}

.hero__desc {
  font-size: .95rem;
  opacity: .8;
  line-height: 1.8;
  max-width: 540px;
  margin-bottom: 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .7rem 1.5rem;
  border-radius: var(--radius-sm);
  font-size: .88rem;
  font-weight: 700;
  text-decoration: none;
  transition: transform .15s, box-shadow .15s;
  letter-spacing: .03em;
}

.btn--primary {
  background: var(--color-accent);
  color: #fff;
}

.btn--outline {
  border: 1.5px solid rgba(255,255,255,.4);
  color: #fff;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(0,0,0,.2);
}

/* ─── Section Labels ─────────────────────────────────────────────────── */
.section-label {
  font-size: .72rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  font-weight: 700;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: .75rem;
}

.section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

/* ─── Reports Grid ───────────────────────────────────────────────────── */
.reports-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
}

/* ─── Search Box ─────────────────────────────────────────────────────── */
.search-box {
  display: flex;
  gap: .5rem;
  margin-bottom: 2rem;
}

.search-input {
  flex: 1;
  padding: .65rem 1rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: .9rem;
  background: var(--color-bg-card);
  color: var(--color-text);
  transition: border-color .15s;
  outline: none;
}

.search-input:focus {
  border-color: var(--color-primary-mid);
}

/* ─── Report Detail Header ───────────────────────────────────────────── */
.report-header {
  padding: 2.5rem 0 2rem;
  margin-bottom: 2.5rem;
}

.report-header__meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.report-header__issue {
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: var(--color-accent-pale);
  padding: .25rem .65rem;
  border-radius: var(--radius-sm);
}

.report-header__period {
  font-size: .82rem;
  color: var(--color-text-faint);
}

.report-header__title {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-family: var(--font-serif);
  color: var(--color-primary);
  line-height: 1.4;
  margin-bottom: .75rem;
}

.report-header__desc {
  font-size: .9rem;
  color: var(--color-text-muted);
  line-height: 1.75;
  max-width: 640px;
}

/* ─── About ──────────────────────────────────────────────────────────── */
.about-section {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 2rem;
  margin-bottom: 2rem;
}

.about-section h2 {
  font-size: 1.1rem;
  color: var(--color-primary);
  margin-bottom: 1rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid var(--color-border);
  font-family: var(--font-serif);
}

.about-section p, .about-section li {
  font-size: .9rem;
  color: var(--color-text-muted);
  line-height: 1.85;
}

.disclaimer-box {
  background: var(--color-accent-pale);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin-bottom: 2rem;
}

.disclaimer-box p {
  font-size: .83rem;
  color: var(--color-accent-dark);
  line-height: 1.75;
  margin: 0;
}

/* ─── Breadcrumb ─────────────────────────────────────────────────────── */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: .4rem;
  font-size: .78rem;
  color: var(--color-text-faint);
  padding: 1rem 0 0;
  list-style: none;
}

.breadcrumb a {
  color: var(--color-primary-mid);
  text-decoration: none;
}

.breadcrumb a:hover { text-decoration: underline; }

.breadcrumb li:not(:last-child)::after {
  content: '›';
  margin-left: .4rem;
}

/* ─── ヘッダー中間域レスポンシブ ─────────────────────────────────────── */
@media (max-width: 1300px) {
  .site-nav { gap: 1.25rem; }
  .site-header__inner { gap: 0.75rem; }
}

@media (max-width: 1150px) {
  .site-nav { gap: 0.75rem; font-size: 0.78rem; }
}

/* ─── 768px以下: ハンバーガーメニューへ切替 ─────────────────────────── */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    min-width: 220px;
    max-width: calc(100vw - 2rem);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-hover);
    padding: .5rem 0;
    z-index: 150;
    opacity: 0;
    transform: translateY(-4px);
    pointer-events: none;
    transition: opacity .15s ease, transform .15s ease;
  }

  .site-nav[data-open="true"] {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .site-nav li {
    width: 100%;
  }

  .site-nav a {
    display: block;
    padding: .75rem 1.25rem;
    font-size: .9rem;
    border-bottom: none;
    border-left: 3px solid transparent;
    color: var(--color-text);
  }

  .site-nav a:hover,
  .site-nav a[aria-current="page"] {
    background: var(--color-accent-pale);
    border-bottom-color: transparent;
    border-left-color: var(--color-accent);
    color: var(--color-accent-dark);
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-nav, .nav-toggle__bar { transition: none; }
}

@media (max-width: 640px) {
  /* ─── ヘッダー（スマホ最小余白） */
  .site-header__inner { padding: .65rem 1rem; }
  .site-header__brand-name { font-size: .92rem; }
  .site-header__brand-label { font-size: .6rem; }

  /* ─── Hero（モバイル） */
  .hero {
    padding: 2rem 1.25rem 1.75rem;
  }

  .hero__title { font-size: 1.5rem; }
  .hero__desc { font-size: .88rem; margin-bottom: 1.5rem; }
  .btn { padding: .65rem 1.25rem; font-size: .85rem; }

  /* ─── Container */
  .container { padding: 0 1rem; }
  .container--wide { padding: 0 1rem; }

  /* ─── レポートカード（モバイル最適化） */
  .reports-grid { grid-template-columns: 1fr; gap: .85rem; }

  .report-card {
    padding: 1.1rem;
    border-radius: var(--radius-md);
    /* タップフィードバック */
    -webkit-tap-highlight-color: rgba(13,74,52,.08);
    tap-highlight-color: rgba(13,74,52,.08);
  }

  .report-card:active {
    transform: scale(0.99);
    transition: transform .08s;
  }

  .report-card__title { font-size: .98rem; }
  .report-card__desc { font-size: .82rem; -webkit-line-clamp: 3; }

  /* ─── ハイライトボックス */
  .highlight-box {
    padding: 1.25rem;
    border-radius: var(--radius-md);
  }
  .highlight-box__list li { font-size: .86rem; }

  /* ─── ページヘッダー */
  .page-header { padding: 2rem 0 1.5rem; margin-bottom: 1.75rem; }
  .page-title { font-size: 1.5rem; }

  /* ─── レポート詳細 */
  .report-layout {
    grid-template-columns: 1fr;
    padding: 0 1rem;
    gap: 1.5rem;
  }

  .report-toc { display: none; }

  .report-header {
    padding: 1.75rem 0 1.25rem;
    margin-bottom: 1.5rem;
  }

  .report-header__title { font-size: 1.35rem; }

  /* ─── Prose（モバイル） */
  .prose { font-size: .9rem; }
  .prose h2 { font-size: 1.2rem; margin-top: 2.25rem; }
  .prose h3 { font-size: 1rem; }

  /* テーブルのモバイル対応 */
  .prose table {
    font-size: .78rem;
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    white-space: nowrap;
  }

  .prose thead th,
  .prose tbody td {
    padding: .5rem .65rem;
  }

  /* ─── 前後ナビ */
  .prev-next-nav {
    grid-template-columns: 1fr !important;
  }

  /* ─── 検索ボックス */
  .search-input { font-size: .88rem; }

  /* ─── Section Label */
  .section-label { font-size: .7rem; }

  /* フッターをボトムナビ分上げる必要なし（body paddingで対応） */
  .site-footer { margin-top: 2.5rem; }

  /* ─── ブレッドクラム（モバイルは省略） */
  .breadcrumb { font-size: .72rem; padding: .75rem 0 0; }
  .breadcrumb li:not(:last-child):not(:nth-last-child(2)) { display: none; }
  .breadcrumb li:nth-last-child(2)::after { content: '›'; }

  /* ─── タグの余白 */
  .tag { font-size: .65rem; padding: .18rem .55rem; }
}

/* ─── 中サイズ対応（タブレット） ──────────────────────────────────────── */
@media (min-width: 641px) and (max-width: 900px) {
  .reports-grid { grid-template-columns: repeat(2, 1fr); }
  .report-layout { grid-template-columns: 190px 1fr; }
}

/* ─── Desktop（既存との互換） ─────────────────────────────────────────── */
@media (max-width: 760px) {
  .report-layout { grid-template-columns: 1fr; }
  .report-toc { display: none; }
}

/* ─── モバイル：スクロール改善 ─────────────────────────────────────────── */
@media (max-width: 640px) {
  html { -webkit-overflow-scrolling: touch; }

  /* 入力フォームのズームを防ぐ */
  input, select, textarea {
    font-size: 16px !important;
  }
}

/* ─── Animations ─────────────────────────────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.animate-fade-up {
  animation: fadeUp .5s ease forwards;
}

.animate-fade-up:nth-child(1) { animation-delay: .05s; }
.animate-fade-up:nth-child(2) { animation-delay: .12s; }
.animate-fade-up:nth-child(3) { animation-delay: .19s; }
.animate-fade-up:nth-child(4) { animation-delay: .26s; }