/* Design tokens from @digital-go-jp/tailwind-theme-plugin */
:root {
  --color-white: #ffffff;
  --color-black: #000000;
  --color-key-50: #e8f1fe;
  --color-key-100: #d9e6ff;
  --color-key-200: #c5d7fb;
  --color-key-500: #4979f5;
  --color-key-700: #264af4;
  --color-key-800: #0031d8;
  --color-key-900: #0017c1;
  --color-key-1000: #00118f;
  --color-key-1100: #000071;

  --color-solid-gray-50: #f2f2f2;
  --color-solid-gray-100: #e6e6e6;
  --color-solid-gray-200: #cccccc;
  --color-solid-gray-300: #b3b3b3;
  --color-solid-gray-400: #999999;
  --color-solid-gray-500: #7f7f7f;
  --color-solid-gray-536: #767676;
  --color-solid-gray-600: #666666;
  --color-solid-gray-700: #4d4d4d;
  --color-solid-gray-800: #333333;
  --color-solid-gray-900: #1a1a1a;

  --color-error-1: #ec0000;
  --color-focus-blue: #0877d7;

  --font-sans: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'Noto Sans Mono', 'Menlo', monospace;

  --radius-4: 0.25rem;
  --radius-6: 0.375rem;
  --radius-8: 0.5rem;

  --shadow-1: 0 2px 8px 1px rgba(0,0,0,0.1), 0 1px 5px 0 rgba(0,0,0,0.3);

  /* Semantic aliases */
  --color-text-primary: var(--color-solid-gray-900);
  --color-text-secondary: var(--color-solid-gray-800);
  --color-text-tertiary: var(--color-solid-gray-700);
  --color-text-link: var(--color-key-900);
  --color-text-link-hover: var(--color-key-1000);
  --color-border: var(--color-solid-gray-200);
  --color-border-strong: var(--color-solid-gray-300);
  --color-bg-page: var(--color-white);
  --color-bg-subtle: var(--color-solid-gray-50);
  --color-bg-tag: var(--color-key-50);
  --color-text-tag: var(--color-key-900);

  --header-height: 64px;
}

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

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  padding: 0.5rem 1rem;
  background: var(--color-key-900);
  color: var(--color-white);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 700;
  border-radius: 0 0 var(--radius-4) var(--radius-4);
  text-decoration: none;
  z-index: 9999;
}
.skip-link:focus { top: 0; }

/* Base */
html { font-size: 17px; }

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text-primary);
  background: var(--color-bg-page);
  letter-spacing: 0.02em;
}

/* =========================================================
   Header
   ========================================================= */
.site-header {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

/* Blue accent stripe at top – デジタル庁の特徴的なデザイン */
.site-header::before {
  content: '';
  display: block;
  height: 4px;
  background: var(--color-key-900);
}

.header-inner {
  max-width: 1024px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.site-title {
  font-size: 1.125rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--color-text-primary);
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.site-title:hover { color: var(--color-key-900); text-decoration: none; }

.header-nav { display: flex; align-items: center; gap: 0.25rem; }

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 0.875rem;
  font-size: 0.9375rem;
  font-weight: 400;
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-6);
  transition: background 0.1s, color 0.1s;
}
.nav-link:hover {
  background: var(--color-bg-subtle);
  color: var(--color-key-900);
  text-decoration: none;
}
.nav-link svg { flex-shrink: 0; }

/* =========================================================
   Main layout
   ========================================================= */
.site-main { min-height: calc(100vh - 60px - 72px); }

.main-inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

/* =========================================================
   Typography
   ========================================================= */
h1 {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.01em;
  color: var(--color-text-primary);
  margin-bottom: 1.5rem;
}
h2 {
  font-size: 1.375rem;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: 0.02em;
  margin: 2.5rem 0 0.75rem;
}
h3 {
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.6;
  letter-spacing: 0.02em;
  margin: 2rem 0 0.5rem;
}

a {
  color: var(--color-text-link);
  text-decoration: underline;
  text-underline-offset: 2px;
}
a:hover { color: var(--color-text-link-hover); }

/* =========================================================
   Post list (index / tag pages)
   ========================================================= */
.page-heading {
  padding-bottom: 1.25rem;
  margin-bottom: 2rem;
  border-bottom: 2px solid var(--color-key-900);
}

.post-list { list-style: none; }

.post-item {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--color-border);
}
.post-item:first-child { border-top: 1px solid var(--color-border); }

.post-item-title {
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--color-text-link);
  text-decoration: none;
  display: block;
  margin-bottom: 0.375rem;
}
.post-item-title:hover {
  color: var(--color-text-link-hover);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.post-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

time {
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
  font-weight: 400;
  letter-spacing: 0;
}

.categories {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.375rem;
}

.category-badge {
  display: inline-block;
  padding: 0.125rem 0.625rem;
  background: var(--color-solid-gray-100);
  color: var(--color-text-secondary);
  font-size: 0.8125rem;
  font-weight: 700;
  border-radius: var(--radius-4);
  text-decoration: none;
  line-height: 1.6;
  letter-spacing: 0.02em;
}
.category-badge:hover {
  background: var(--color-solid-gray-200);
  color: var(--color-text-primary);
  text-decoration: none;
}

.category-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.category-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.875rem 0;
  border-bottom: 1px solid var(--color-border);
}
.category-item:first-child { border-top: 1px solid var(--color-border); }

.category-link {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text-link);
  text-decoration: none;
}
.category-link:hover { text-decoration: underline; text-underline-offset: 2px; }

.category-count {
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
}

.tags {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.375rem;
}

.tag {
  display: inline-block;
  padding: 0.125rem 0.625rem;
  background: var(--color-bg-tag);
  color: var(--color-text-tag);
  font-size: 0.8125rem;
  font-weight: 700;
  border-radius: var(--radius-full, 9999px);
  text-decoration: none;
  line-height: 1.6;
  letter-spacing: 0.02em;
}
.tag:hover {
  background: var(--color-key-100);
  color: var(--color-key-1000);
  text-decoration: none;
}

.summary {
  font-size: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-top: 0.25rem;
}

.empty-state {
  padding: 3rem 0;
  text-align: center;
  color: var(--color-text-tertiary);
}

/* =========================================================
   Article (post page)
   ========================================================= */
.article-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.article-title {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.01em;
  margin-bottom: 1rem;
}

.article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.article-content {
  margin: 2rem 0;
  font-size: 1rem;
  line-height: 1.7;
}
.article-content p { margin-bottom: 1.25rem; }
.article-content h2 {
  font-size: 1.375rem;
  font-weight: 700;
  margin: 2.5rem 0 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-key-900);
}
.article-content h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin: 2rem 0 0.5rem;
  padding-left: 0.75rem;
  border-left: 3px solid var(--color-key-500);
}
.article-content h4 {
  font-size: 1rem;
  font-weight: 700;
  margin: 1.5rem 0 0.375rem;
}
.article-content pre {
  background: var(--color-solid-gray-900);
  color: #f8f8f2;
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-8);
  overflow-x: auto;
  margin-bottom: 1.25rem;
  font-size: 0.875rem;
}
.article-content code {
  font-family: var(--font-mono);
  font-size: 0.875em;
}
.article-content pre code { background: none; padding: 0; color: inherit; font-size: 1em; }
.article-content code:not(pre code) {
  background: var(--color-bg-subtle);
  color: var(--color-solid-gray-800);
  padding: 0.1em 0.4em;
  border-radius: var(--radius-4);
  border: 1px solid var(--color-border);
}
.article-content ul, .article-content ol {
  margin: 0 0 1.25rem 1.5rem;
}
.article-content li { margin-bottom: 0.375rem; }
.article-content blockquote {
  border-left: 4px solid var(--color-key-200);
  padding: 0.75rem 1.25rem;
  color: var(--color-text-secondary);
  margin: 1.5rem 0;
  background: var(--color-key-50);
  border-radius: 0 var(--radius-4) var(--radius-4) 0;
}
.article-content table {
  border-collapse: collapse;
  width: 100%;
  margin-bottom: 1.25rem;
  font-size: 0.9375rem;
}
.article-content th, .article-content td {
  border: 1px solid var(--color-border);
  padding: 0.625rem 0.875rem;
  text-align: left;
}
.article-content th {
  background: var(--color-bg-subtle);
  font-weight: 700;
}
.article-content tr:nth-child(even) { background: var(--color-solid-gray-50); }
.article-content img { max-width: 100%; height: auto; border-radius: var(--radius-4); }
.article-content a {
  color: var(--color-text-link);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.article-content a:hover { color: var(--color-text-link-hover); }

/* =========================================================
   Author card
   ========================================================= */
.author-card {
  display: flex;
  gap: 1.25rem;
  margin-top: 3rem;
  padding: 1.5rem;
  border-top: 2px solid var(--color-key-900);
  background: var(--color-bg-subtle);
  border-radius: 0 0 var(--radius-8) var(--radius-8);
}

.author-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 2px solid var(--color-border);
}

.author-body { flex: 1; }

.author-name {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: baseline;
  gap: 0.625rem;
  flex-wrap: wrap;
}

.author-role {
  font-size: 0.8125rem;
  font-weight: 400;
  color: var(--color-text-tertiary);
}

.author-bio {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin: 0;
}

@media (max-width: 600px) {
  .author-card { flex-direction: column; gap: 1rem; }
  .author-avatar { width: 56px; height: 56px; }
}

/* =========================================================
   Related posts
   ========================================================= */
.related-posts {
  margin-top: 3rem;
  padding: 1.5rem;
  background: var(--color-bg-subtle);
  border-radius: var(--radius-8);
  border: 1px solid var(--color-border);
}

.related-heading {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text-secondary);
  letter-spacing: 0.04em;
  margin-bottom: 1rem;
  padding-bottom: 0;
  border: none;
}

.related-list { list-style: none; }

.related-item {
  padding: 0.875rem 0;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}
.related-item:last-child { border-bottom: none; padding-bottom: 0; }
.related-item:first-child { padding-top: 0; }

.related-link {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text-link);
  text-decoration: none;
  line-height: 1.5;
}
.related-link:hover { text-decoration: underline; text-underline-offset: 2px; }

.related-item time {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
}

.article-footer {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-text-link);
  text-decoration: none;
}
.back-link:hover { color: var(--color-text-link-hover); text-decoration: underline; text-underline-offset: 2px; }

/* =========================================================
   Search page
   ========================================================= */
.search-box {
  margin: 1.5rem 0 2rem;
  display: flex;
  gap: 0.5rem;
  max-width: 560px;
}

.search-input {
  flex: 1;
  padding: 0.625rem 0.875rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--color-text-primary);
  background: var(--color-white);
  border: 2px solid var(--color-border-strong);
  border-radius: var(--radius-6);
  outline: none;
  transition: border-color 0.15s;
  letter-spacing: 0.02em;
}
.search-input:focus {
  border-color: var(--color-key-900);
  box-shadow: 0 0 0 3px rgba(0, 23, 193, 0.15);
}
.search-input::placeholder { color: var(--color-text-tertiary); }

.search-button {
  padding: 0.625rem 1.375rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-white);
  background: var(--color-key-900);
  border: 2px solid var(--color-key-900);
  border-radius: var(--radius-6);
  cursor: pointer;
  letter-spacing: 0.02em;
  transition: background 0.15s, border-color 0.15s;
  white-space: nowrap;
}
.search-button:hover { background: var(--color-key-1000); border-color: var(--color-key-1000); }
.search-button:disabled { opacity: 0.5; cursor: not-allowed; }

#search-status {
  font-size: 0.9rem;
  color: var(--color-text-tertiary);
  min-height: 1.4em;
  margin-bottom: 0.5rem;
}
.search-count {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
  font-weight: 700;
}
.search-empty {
  color: var(--color-text-secondary);
  margin-top: 1rem;
  padding: 2rem 0;
  text-align: center;
}

/* =========================================================
   Tag page heading
   ========================================================= */
.tag-badge {
  display: inline-block;
  padding: 0.25rem 0.875rem;
  background: var(--color-bg-tag);
  color: var(--color-text-tag);
  font-size: 1rem;
  font-weight: 700;
  border-radius: 9999px;
  margin-left: 0.5rem;
  letter-spacing: 0.02em;
}

/* =========================================================
   Footer
   ========================================================= */
.site-footer {
  background: var(--color-solid-gray-900);
  color: var(--color-solid-gray-300);
  margin-top: 4rem;
}

.footer-inner {
  max-width: 1024px;
  margin: 0 auto;
  padding: 2rem 1.5rem 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.25rem 1.5rem;
}

.footer-link {
  font-size: 0.875rem;
  color: var(--color-solid-gray-300);
  text-decoration: none;
  letter-spacing: 0.02em;
}
.footer-link:hover {
  color: var(--color-white);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.footer-text {
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  color: var(--color-solid-gray-500);
}

/* =========================================================
   Static pages (company / contact / privacy / terms)
   ========================================================= */
.static-page {
  font-size: 1rem;
  line-height: 1.8;
}
.static-page p { margin-bottom: 1.25rem; }
.static-page h2 {
  font-size: 1.125rem;
  font-weight: 700;
  margin: 2.5rem 0 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-key-900);
}
.static-page ul {
  margin: 0 0 1.25rem 1.5rem;
}
.static-page li { margin-bottom: 0.375rem; }
.static-page a {
  color: var(--color-text-link);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.static-page a:hover { color: var(--color-text-link-hover); }

.static-updated {
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
  margin-bottom: 1.5rem !important;
}

/* 会社情報テーブル */
.info-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 2.5rem;
  font-size: 0.9375rem;
}
.info-table th, .info-table td {
  padding: 0.875rem 1rem;
  border: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
}
.info-table th {
  background: var(--color-bg-subtle);
  font-weight: 700;
  white-space: nowrap;
  width: 8rem;
  color: var(--color-text-secondary);
}

/* お問い合わせカード */
.contact-cards {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin: 1.5rem 0 2rem;
}
.contact-card {
  display: flex;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-8);
  background: var(--color-bg-subtle);
}
.contact-card-icon {
  flex-shrink: 0;
  color: var(--color-key-900);
  margin-top: 0.125rem;
}
.contact-card-body { flex: 1; }
.contact-card-label {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-text-tertiary);
  margin-bottom: 0.25rem;
  letter-spacing: 0.04em;
}
.contact-card-link {
  display: inline-block;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text-link);
  text-decoration: none;
  margin-bottom: 0.375rem;
}
.contact-card-link:hover { text-decoration: underline; text-underline-offset: 2px; }
.contact-card-note {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin: 0;
}

/* 注意書きボックス */
.notice-box {
  background: var(--color-key-50);
  border-left: 4px solid var(--color-key-500);
  border-radius: 0 var(--radius-4) var(--radius-4) 0;
  padding: 1rem 1.25rem;
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}
.notice-box p { margin: 0; }

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 600px) {
  .main-inner { padding: 1.5rem 1rem 3rem; }
  .header-inner { padding: 0 1rem; }
  h1, .article-title { font-size: 1.375rem; }
  .search-box { flex-direction: column; max-width: 100%; }
  .search-button { width: 100%; }
}