.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.article-card {
  --card-tone: #165d72;
  --card-tint: #f1f7f9;
  --card-badge: #deedf2;
  position: relative;
  isolation: isolate;
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 24px;
  border: 1px solid #cfdee3;
  border-top: 4px solid var(--card-tone);
  border-radius: 10px;
  background: var(--card-tint);
  box-shadow: 0 3px 10px #192d3708;
  transition: box-shadow 160ms ease, transform 160ms ease, border-color 160ms ease;
}
.article-card[data-category="robotics"] {
  --card-tone: #496455;
  --card-tint: #f2f6f2;
  --card-badge: #e0ebe2;
}
.article-card[data-category="mobility"] {
  --card-tone: #4d6089;
  --card-tint: #f3f5fa;
  --card-badge: #e3e8f3;
}
.article-card[data-category="efficiency"] {
  --card-tone: #805d36;
  --card-tint: #faf6ef;
  --card-badge: #f0e6d6;
}
.article-card h3 {
  font-size: 19px;
  line-height: 1.65;
  margin: 4px 0 12px;
  overflow-wrap: anywhere;
}
.article-card p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.85;
  margin: 0 0 24px;
}
.card-link::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  border-radius: 8px;
}
.card-link:focus-visible {
  outline: none;
}
.card-link:focus-visible::after {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}
.card-image {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  border-radius: 5px;
  margin-bottom: 18px;
}
.card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 16px;
}
.card-meta > a {
  position: relative;
  z-index: 2;
  color: var(--card-tone);
  background: var(--card-badge);
  border-radius: 4px;
  padding: 5px 9px;
  font-weight: 700;
  line-height: 1.5;
}
.card-meta time {
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
.card-cta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  align-self: flex-start;
  gap: 24px;
  min-height: 44px;
  margin-top: auto;
  padding: 8px 15px;
  border-radius: 5px;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
}
.article-card:focus-within {
  border-color: var(--card-tone);
  box-shadow: 0 8px 24px #192d3714;
}
@media (hover: hover) {
  .article-card:hover {
    transform: translateY(-3px);
    border-color: var(--card-tone);
    box-shadow: 0 10px 26px #192d371a;
  }
  .article-card:hover .card-link {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 5px;
  }
  .article-card:hover .card-cta {
    background: #104d60;
  }
}
@media (prefers-reduced-motion: reduce) {
  .article-card { transition: none; }
  .article-card:hover { transform: none; }
}
.related .article-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (max-width: 600px) {
  .article-card { padding: 20px; }
  .related .article-grid { grid-template-columns: 1fr; }
}
.badge {
  display: inline-block;
  border: 1px solid var(--line);
  padding: 1px 7px;
  font-size: 12px;
  margin-right: 6px;
  background: var(--wash);
}
.topic-articles {
  list-style: none;
  padding: 0;
  margin: 18px 0 0;
  border-top: 1px solid var(--line);
}
.topic-articles li {
  font-size: 13px;
  line-height: 1.7;
  padding-top: 12px;
}
.page-heading {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  padding: 42px 0 24px;
}
.page-heading h1 {
  font-size: 30px;
  margin: 8px 0;
}
.page-heading p {
  color: var(--muted);
  margin-bottom: 8px;
}
.muted,
.hint {
  color: var(--muted);
}
.hint {
  font-size: 13px;
  line-height: 1.7;
  margin-top: 8px;
}
.container > .article-grid {
  margin-bottom: 56px;
}
.narrow {
  max-width: 780px;
  margin: 30px auto 70px;
}
.info-page {
  padding-top: 18px;
}
.reading {
  max-width: 760px;
  margin: 30px auto 60px;
}
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 32px;
}
.article-header h1 {
  font-family: var(--serif);
  font-size: 34px;
  line-height: 1.6;
  margin: 18px 0;
}
.category-label {
  color: var(--accent);
  font-size: 14px;
  font-weight: 600;
}
.article-summary {
  font-size: 17px;
  color: var(--muted);
}
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 7px 20px;
  border-top: 1px solid var(--line);
  padding-top: 16px;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 30px;
}
.eyecatch {
  margin: 28px 0;
}
.eyecatch img {
  width: 100%;
  height: auto;
  border-radius: 3px;
}
.toc {
  padding: 24px 28px;
  background: var(--wash);
  border: 1px solid var(--line);
  margin: 32px 0;
}
.toc h2 {
  font-size: 17px;
}
.toc ol {
  margin: 0;
  padding-left: 24px;
}
.toc li {
  margin: 7px 0;
  font-size: 15px;
}
.toc .level-3 {
  margin-left: 18px;
}
.prose {
  font-size: 17px;
  line-height: 2.05;
  overflow-wrap: anywhere;
}
.prose h2 {
  font-family: var(--serif);
  font-size: 25px;
  border-bottom: 2px solid var(--line);
  padding-bottom: 12px;
  margin: 44px 0 22px;
  scroll-margin-top: 24px;
}
.prose h3 {
  font-size: 20px;
  margin: 32px 0 16px;
}
.prose p {
  margin-bottom: 24px;
}
.prose a,
.sources a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 4px;
}
.prose table {
  display: block;
  overflow-x: auto;
  max-width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  margin: 25px 0;
}
.prose th,
.prose td {
  padding: 12px 16px;
  border: 1px solid var(--line);
  min-width: 120px;
  text-align: left;
}
.prose th {
  background: var(--wash);
}
.prose blockquote {
  border-left: 3px solid var(--accent);
  margin: 25px 0;
  padding: 4px 22px;
  color: var(--muted);
}
.prose blockquote p {
  margin: 12px 0;
}
.prose pre {
  overflow-x: auto;
  background: #f2f5f7;
  padding: 20px;
  font-size: 14px;
  line-height: 1.6;
}
.sources {
  margin-top: 45px;
  border-top: 1px solid var(--line);
  padding-top: 22px;
}
.sources h2 {
  font-size: 20px;
}
.sources ol {
  padding-left: 22px;
}
.sources li {
  margin: 14px 0;
}
.sources small {
  display: block;
  color: var(--muted);
  font-size: 13px;
}
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 26px 0;
}
.tags a {
  font-size: 13px;
  background: var(--wash);
  padding: 4px 12px;
}
.related {
  margin: 40px 0 60px;
}
.notice {
  padding: 15px 18px;
  margin: 18px 0;
  background: #edf5f8;
  border-left: 3px solid var(--accent);
  font-size: 14px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.notice.error {
  border-color: #a33434;
  background: #fff1ef;
  color: #86312a;
}
.search-form {
  display: flex;
  gap: 10px;
  max-width: 720px;
  margin: 10px 0 32px;
}
.search-form input {
  margin: 0;
  flex: 1;
  min-width: 0;
}
.pagination {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin: 36px 0 55px;
  font-size: 14px;
}
.pagination a {
  color: var(--accent);
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}
.admin-main {
  max-width: 1220px;
  padding: 0 32px;
  margin: auto;
}
.admin-nav {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--line);
  padding: 18px 0;
  font-size: 14px;
}
.admin-nav form {
  margin-left: auto;
}
.link-button {
  border: 0;
  background: none;
  padding: 0;
  color: var(--muted);
  font-size: 14px;
}
.panel {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 24px;
  margin-bottom: 22px;
  min-width: 0;
}
.panel h2 {
  font-size: 19px;
  margin-bottom: 20px;
}
.panel summary {
  font-weight: 600;
  cursor: pointer;
  margin-bottom: 20px;
}
.editor-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 265px;
  gap: 28px;
  align-items: start;
  margin-bottom: 60px;
}
.editor-sidebar {
  position: sticky;
  top: 20px;
}
.editor-sidebar .panel {
  padding: 20px;
}
.editor-sidebar h2 {
  font-size: 17px;
}
fieldset {
  border: 0;
  margin: 0;
  padding: 0;
  min-width: 0;
}
label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 18px;
}
input,
select,
textarea {
  display: block;
  width: 100%;
  border: 1px solid #b9cbd2;
  background: #fff;
  color: var(--ink);
  border-radius: 4px;
  padding: 10px 12px;
  margin-top: 7px;
  font-size: 16px;
  line-height: 1.6;
}
textarea {
  resize: vertical;
  min-height: 110px;
}
textarea[name="body"],
textarea[name="json"] {
  font-family: ui-monospace, Consolas, Meiryo, monospace;
  font-size: 15px;
  line-height: 1.85;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.checkbox {
  display: flex;
  gap: 10px;
  align-items: center;
}
.checkbox input {
  width: 18px;
  height: 18px;
  margin: 0;
}
.button,
button,
.primary {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  border: 1px solid #b5c9d2;
  border-radius: 4px;
  background: #fff;
  color: var(--ink);
  padding: 10px 17px;
  font-size: 14px;
  line-height: 1.7;
  font-weight: 600;
  text-decoration: none;
  min-height: 44px;
}
.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}
.primary:hover {
  background: #104d60;
  color: white;
  text-decoration: none;
}
.button:hover,
button:hover {
  border-color: var(--accent);
}
button:disabled,
fieldset:disabled {
  opacity: 0.65;
  cursor: default;
}
.danger {
  color: #a13c36;
  border-color: #d9b7b3;
}
.stack {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.editor-actions {
  display: flex;
  gap: 12px;
  position: sticky;
  bottom: 0;
  background: #fffffff5;
  padding: 16px 0;
  border-top: 1px solid var(--line);
  z-index: 2;
}
.checklist {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.9;
}
.checklist li {
  margin-bottom: 8px;
}
.filter-tabs {
  display: flex;
  gap: 10px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 14px;
}
.filter-tabs a {
  padding: 6px 16px;
  font-size: 14px;
  border-radius: 4px;
}
.filter-tabs a[aria-current] {
  background: var(--accent);
  color: white;
}
.admin-list {
  margin-bottom: 50px;
}
.admin-list article {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}
.admin-list h2 {
  font-size: 19px;
  margin: 8px 0;
}
.admin-list p {
  color: var(--muted);
  font-size: 13px;
  margin: 0;
}
.status {
  display: inline-block;
  border-radius: 3px;
  padding: 2px 9px;
  font-size: 12px;
  background: #edf1f3;
  color: #4d616c;
}
.status.published {
  color: #215e4c;
  background: #e8f3ee;
}
.status.private {
  background: #faeee6;
  color: #87512d;
}
.login {
  max-width: 480px;
  margin: 65px auto 90px;
}
.login h1 {
  font-size: 28px;
}
.login p {
  font-size: 15px;
  color: var(--muted);
}
#preview-pane {
  margin-bottom: 60px;
}
#preview-frame {
  width: 100%;
  height: 850px;
  border: 1px solid var(--line);
  background: white;
}
#message:empty {
  display: none;
}
[hidden] {
  display: none !important;
}
.ad-slot {
  max-width: 760px;
  margin: 30px auto;
}
.ad-slot > span {
  font-size: 12px;
  color: var(--muted);
}
.adsbygoogle {
  display: block;
}
dt {
  font-weight: 600;
  font-size: 15px;
}
dd {
  margin: 4px 0 20px;
  color: var(--muted);
}
@media (max-width: 900px) {
  .editor-layout {
    grid-template-columns: 1fr;
  }
  .editor-sidebar {
    position: static;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }
  .article-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 600px) {
  .article-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .article-card h3 {
    font-size: 20px;
  }
  .article-card p {
    font-size: 15px;
  }
  .card-meta {
    font-size: 13px;
  }
  .page-heading {
    padding: 28px 0 16px;
    display: block;
  }
  .page-heading h1 {
    font-size: 27px;
  }
  .page-heading .primary {
    margin-top: 12px;
  }
  .article-header h1 {
    font-size: 27px;
    line-height: 1.7;
  }
  .article-summary {
    font-size: 16px;
  }
  .reading {
    margin-top: 20px;
  }
  .prose {
    font-size: 17px;
    line-height: 2;
  }
  .prose h2 {
    font-size: 22px;
  }
  .toc {
    padding: 20px;
  }
  .admin-main {
    padding: 0 18px;
  }
  .admin-nav {
    gap: 10px 16px;
    font-size: 13px;
  }
  .admin-nav form {
    margin-left: 0;
  }
  .panel {
    padding: 18px;
  }
  .form-row {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .editor-sidebar {
    display: block;
  }
  .editor-actions {
    flex-wrap: wrap;
  }
  .editor-actions button {
    flex: 1;
  }
  .admin-list article {
    align-items: start;
  }
  .admin-list .button {
    white-space: nowrap;
    padding: 8px 10px;
  }
  .admin-list h2 {
    font-size: 17px;
  }
  .filter-tabs {
    gap: 4px;
  }
  .filter-tabs a {
    padding: 6px 12px;
  }
  .search-form {
    gap: 8px;
  }
  .narrow {
    margin-bottom: 45px;
  }
  .login {
    margin: 35px auto 60px;
  }
  #preview-frame {
    height: 680px;
  }
}
.confirm-dialog {
  max-width: 440px;
  width: calc(100% - 40px);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 26px;
  color: var(--ink);
}
.brand small {
  font-size: 12px;
  letter-spacing: 0.1em;
}
.section-heading small {
  font-size: 12px;
}
.search-link {
  white-space: nowrap;
}
@media (max-width: 350px) {
  .header-inner {
    gap: 12px;
  }
  .brand {
    gap: 8px;
    font-size: 18px;
    white-space: nowrap;
  }
  .brand img {
    width: 30px;
  }
  .brand small {
    font-size: 12px;
    letter-spacing: 0;
  }
  .header-inner nav {
    gap: 0;
  }
  .search-link {
    padding-left: 10px;
  }
  .search-link span {
    font-size: 18px;
    margin-left: 2px;
  }
  .intro h1 {
    font-size: 21px;
    letter-spacing: 0;
  }
}
.confirm-dialog::backdrop {
  background: #122d3c80;
}
.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}
.editor-note p {
  font-size: 22px;
}
@media (max-width: 600px) {
  .editor-actions {
    flex-direction: column;
  }
  .editor-actions button {
    width: 100%;
  }
}

.analytics-notice { padding: 16px max(20px, calc((100% - 1160px) / 2)); background: #e8f0ee; color: #203e38; border-bottom: 1px solid #b8cec8; }
.analytics-notice p { margin: 0 0 10px; }
.analytics-notice > div { display: flex; flex-wrap: wrap; gap: 10px; }
.analytics-notice button { min-height: 44px; }