.page-about {
  background: var(--color-page);
  color: var(--color-ink);
}

.page-about [id] {
  scroll-margin-top: calc(var(--header-h) + 2rem);
}

.page-about .page-wrap {
  padding-top: 2rem;
  padding-bottom: 4rem;
}

.about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem;
}

.about-anchor {
  position: relative;
  z-index: 4;
}

.about-anchor-inner {
  background: var(--color-purple);
  color: #fff;
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-lg);
  box-shadow: 0 6px 20px rgba(26, 26, 26, .15);
  padding: 1.25rem;
}

.about-anchor-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: .75rem;
}

.about-anchor-code {
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .12em;
  color: var(--color-yellow);
  background: rgba(255, 255, 255, .08);
  padding: .2rem .5rem;
  border-radius: var(--radius-sm);
}

.about-anchor-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: .875rem;
  letter-spacing: .16em;
  color: var(--color-green);
}

.about-anchor-nav {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: .75rem 0;
}

.about-anchor-link {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .45rem .9rem;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, .08);
  color: rgba(255, 255, 255, .9);
  font-family: var(--font-head);
  font-weight: 600;
  font-size: .875rem;
  text-decoration: none;
  transition: background .2s, color .2s, transform .2s;
}

.about-anchor-link:hover {
  background: rgba(184, 255, 41, .2);
  color: var(--color-green);
}

.about-anchor-index {
  font-family: var(--font-mono);
  font-size: .6875rem;
  color: var(--color-yellow);
}

.about-anchor-btn {
  display: block;
  text-align: center;
  margin-top: .5rem;
}

.about-anchor-foot {
  display: none;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: .6875rem;
  color: rgba(255, 255, 255, .55);
  border-top: 1px dashed rgba(255, 255, 255, .2);
  margin-top: .75rem;
  padding-top: .75rem;
}

.about-main {
  min-width: 0;
}

.about-main .breadcrumbs {
  margin-bottom: 1rem;
}

.about-hero {
  position: relative;
  padding: clamp(1.25rem, 4vw, 2.5rem);
  margin-bottom: 3rem;
  background: linear-gradient(135deg, var(--color-cream) 0%, var(--color-cream) 68%, var(--color-pink) 68%, var(--color-pink) 100%);
  border: 3px solid var(--color-ink);
  border-radius: var(--radius-lg);
  box-shadow: 8px 8px 0 var(--color-ink);
  overflow: hidden;
}

.about-hero::after {
  content: "";
  position: absolute;
  right: -18px;
  bottom: -18px;
  width: 90px;
  height: 90px;
  background: var(--color-orange);
  border: 3px solid var(--color-ink);
  border-radius: 18px;
  transform: rotate(12deg);
}

.about-hero-kicker {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .08em;
  color: var(--color-ink);
  background: var(--color-green);
  display: inline-block;
  padding: .3rem .8rem;
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-sm);
  margin: 0 0 1rem;
  position: relative;
  z-index: 1;
}

.about-hero h1 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(2.4rem, 7vw, 3.8rem);
  line-height: 1.05;
  letter-spacing: -.03em;
  margin: 0 0 1rem;
  position: relative;
  z-index: 1;
}

.about-hero-lead {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  max-width: 60ch;
  margin-bottom: 1.5rem;
  position: relative;
  z-index: 1;
}

.about-keyword {
  background: var(--color-yellow);
  border-bottom: 3px solid var(--color-ink);
  font-weight: 700;
  padding: .05em .15em;
}

.about-hero-nums {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .75rem;
  position: relative;
  z-index: 1;
}

.about-hero-num {
  background: var(--color-ink);
  color: var(--color-green);
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-md);
  padding: .75rem 1rem;
  display: flex;
  flex-direction: column;
}

.about-hero-num:nth-child(2) {
  background: var(--color-purple);
  color: var(--color-yellow);
}

.about-hero-num:nth-child(3) {
  background: var(--color-orange);
  color: #fff;
}

.about-hero-num:nth-child(4) {
  background: var(--color-yellow);
  color: var(--color-ink);
}

.about-hero-num-val {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  line-height: 1.1;
}

.about-hero-num-label {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: .75rem;
  opacity: .85;
}

.about-section {
  margin-bottom: 3.5rem;
}

.about-section-head {
  display: flex;
  align-items: baseline;
  gap: .75rem;
  margin-bottom: .75rem;
  padding-bottom: .4rem;
  border-bottom: 3px solid var(--color-ink);
}

.about-section-no {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-orange);
  font-size: 1rem;
}

.about-section-head h2 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.4rem, 3.5vw, 2rem);
  line-height: 1.2;
  margin: 0;
}

.about-section-lead {
  font-family: var(--font-body);
  font-size: .9375rem;
  line-height: 1.7;
  max-width: 62ch;
  margin: 0 0 1.25rem;
}

.scope-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: .85rem;
}

.scope-card {
  background: var(--color-cream);
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 88px;
  box-shadow: var(--shadow-sm);
  transition: transform .2s, box-shadow .2s;
}

.scope-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.scope-card-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.8rem, 3vw, 2.2rem);
  line-height: 1;
  margin-bottom: .4rem;
  display: block;
}

.scope-card-label {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: .8125rem;
  opacity: .85;
}

.scope-card--total {
  background: var(--color-purple);
  color: #fff;
}

.scope-card--total .scope-card-num {
  color: var(--color-green);
}

.scope-card--total .scope-card-label {
  color: rgba(255, 255, 255, .8);
}

.scope-card--live {
  background: var(--color-green);
}

.scope-card--city {
  background: var(--color-orange);
  color: #fff;
}

.scope-card--city .scope-card-label {
  color: rgba(255, 255, 255, .85);
}

.scope-card--resource {
  background: var(--color-pink);
}

.scope-card--fav {
  background: var(--color-yellow);
}

.scope-card--review {
  background: var(--color-tag-bg);
}

.scope-card--tag {
  border-style: dashed;
}

.scope-card--ver {
  background: var(--color-update);
  color: #fff;
}

.scope-card--ver .scope-card-label {
  color: rgba(255, 255, 255, .85);
}

.scope-card--guide {
  background: var(--color-done);
}

.about-scope-summary {
  font-family: var(--font-body);
  font-size: .9375rem;
  line-height: 1.8;
  margin-top: 1.25rem;
  padding: 1rem 1.25rem;
  background: var(--color-pink);
  border-left: 6px solid var(--color-ink);
  border-radius: var(--radius-md);
}

.media-frame {
  overflow: hidden;
}

.about-taxo-figure img,
.about-update-figure img,
.about-access-figure img {
  width: 100%;
  height: auto;
  display: block;
}

.taxo-tiles {
  display: flex;
  flex-direction: column;
  gap: .85rem;
  margin: 1.25rem 0;
}

.taxo-tile {
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-md);
  background: var(--color-cream);
  overflow: hidden;
  transition: box-shadow .2s;
}

.taxo-tile[open] {
  box-shadow: var(--shadow-md);
}

.taxo-tile summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: .75rem;
  padding: .9rem 1.1rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.3;
  transition: filter .2s;
}

.taxo-tile summary::-webkit-details-marker {
  display: none;
}

.taxo-tile summary:hover {
  filter: brightness(.94);
}

.taxo-tile--live summary {
  background: var(--color-orange);
  color: #fff;
}

.taxo-tile--city summary {
  background: var(--color-purple);
  color: #fff;
}

.taxo-tile--resource summary {
  background: var(--color-green);
}

.taxo-tile--fav summary {
  background: var(--color-yellow);
}

.taxo-tile--review summary {
  background: var(--color-pink);
}

.taxo-tile--assist summary {
  background: var(--color-tag-bg);
}

.taxo-tile-title {
  font-weight: 700;
}

.taxo-tile-meta {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  white-space: nowrap;
}

.taxo-tile-count {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .75rem;
  background: var(--color-cream);
  color: var(--color-ink);
  border: 1px solid var(--color-ink);
  border-radius: var(--radius-sm);
  padding: .15rem .5rem;
}

.taxo-tile-toggle {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1rem;
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-ink);
  color: var(--color-green);
  border-radius: 50%;
}

.taxo-tile-toggle::before {
  content: "＋";
}

.taxo-tile[open] .taxo-tile-toggle::before {
  content: "－";
}

.taxo-subtags {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  padding: 1rem 1.1rem;
  background: var(--color-page);
}

.taxo-subtag {
  font-family: var(--font-body);
  font-size: .8125rem;
  font-weight: 600;
  background: var(--color-cream);
  border: 1px solid var(--color-ink);
  border-radius: var(--radius-pill);
  padding: .3rem .8rem;
  transition: background .2s, transform .15s;
}

.taxo-subtag:hover {
  background: var(--color-green);
  transform: translateY(-2px);
}

.about-status-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .75rem;
  margin: 1.25rem 0 .5rem;
  padding: 1rem 1.1rem;
  background: var(--color-purple);
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-md);
}

.about-status-label {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: .8125rem;
  color: var(--color-green);
  margin-right: .25rem;
}

.about-status-line .status-badge {
  background: var(--color-cream);
  color: var(--color-ink);
  border: 2px solid var(--color-ink);
  font-weight: 700;
}

.about-status-line .status-badge--new {
  border-color: var(--color-new);
}

.about-status-line .status-badge--update {
  border-color: var(--color-update);
}

.about-status-line .status-badge--done {
  border-color: var(--color-done);
}

.about-hot-mark {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: .75rem;
  background: var(--color-yellow);
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-pill);
  padding: .25rem .75rem;
}

.about-entry-link {
  display: inline-block;
  margin-top: 1rem;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: .9375rem;
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: 3px solid var(--color-green);
  padding-bottom: 2px;
  transition: background .2s, color .2s;
}

.about-entry-link:hover {
  background: var(--color-green);
}

.about-timeline {
  position: relative;
  margin: 1.5rem 0 1rem;
  padding: 0 0 0 2rem;
}

.about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 4px;
  background: var(--color-ink);
  border-radius: var(--radius-pill);
}

.about-timeline-item {
  position: relative;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .6rem;
  padding: .85rem .5rem .85rem 0;
  border-bottom: 1px dashed rgba(26, 26, 26, .2);
}

.about-timeline-dot {
  position: absolute;
  left: -2rem;
  top: 50%;
  width: 16px;
  height: 16px;
  margin-top: -8px;
  border-radius: 50%;
  border: 3px solid var(--color-ink);
  background: var(--color-cream);
  z-index: 1;
}

.about-timeline-dot--new {
  background: var(--color-new);
}

.about-timeline-dot--update {
  background: var(--color-update);
}

.about-timeline-dot--done {
  background: var(--color-done);
}

.about-timeline-batch {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1rem;
  min-width: 44px;
}

.about-timeline-count {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .8125rem;
  background: var(--color-green);
  border: 1px solid var(--color-ink);
  border-radius: var(--radius-sm);
  padding: .15rem .55rem;
}

.about-timeline-note {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: .75rem;
  color: var(--color-new);
  background: var(--color-pink);
  border: 1px solid var(--color-ink);
  border-radius: var(--radius-sm);
  padding: .15rem .5rem;
}

.version-list {
  margin: 1.25rem 0 .5rem;
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-cream);
}

.version-row {
  display: flex;
  align-items: center;
  gap: .9rem;
  padding: .7rem 1rem;
  border-bottom: 1px solid rgba(26, 26, 26, .12);
}

.version-row:last-child {
  border-bottom: none;
}

.version-row:nth-child(even) {
  background: var(--color-pink);
}

.version-code {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .8125rem;
  background: var(--color-ink);
  color: var(--color-yellow);
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-sm);
  padding: .15rem .5rem;
  white-space: nowrap;
}

.version-desc {
  font-family: var(--font-body);
  font-size: .875rem;
  line-height: 1.4;
}

.access-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin: 1.25rem 0 .5rem;
}

.access-col {
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.access-col--search {
  background: var(--color-tag-bg);
}

.access-col--device {
  background: var(--color-pink);
}

.access-col h3 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.125rem;
  margin: 0 0 1rem;
  padding-bottom: .35rem;
  border-bottom: 2px solid var(--color-ink);
}

.access-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: .55rem;
}

.access-list li {
  display: flex;
  align-items: baseline;
  gap: .5rem;
  font-family: var(--font-body);
  font-size: .9375rem;
  line-height: 1.5;
}

.access-list li::before {
  content: "▸";
  color: var(--color-orange);
  font-weight: 700;
  flex: 0 0 auto;
}

.device-card {
  background: var(--color-cream);
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-md);
  padding: 1rem 1.1rem;
  margin-bottom: .75rem;
}

.device-card:last-child {
  margin-bottom: 0;
}

.device-card--pc {
  border-left: 6px solid var(--color-update);
}

.device-card--mobile {
  border-left: 6px solid var(--color-new);
}

.device-icon {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .6875rem;
  letter-spacing: .1em;
  background: var(--color-ink);
  color: var(--color-green);
  border-radius: var(--radius-sm);
  padding: .15rem .5rem;
  margin-bottom: .4rem;
}

.device-card strong {
  display: block;
  font-family: var(--font-head);
  font-size: 1rem;
  margin: .2rem 0 .25rem;
}

.device-card p {
  margin: 0;
  font-family: var(--font-body);
  font-size: .875rem;
  line-height: 1.55;
}

@media (min-width: 600px) {
  .about-hero-nums {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .scope-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .scope-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .access-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1101px) {
  .about-layout {
    grid-template-columns: 250px minmax(0, 1fr);
    gap: 2.5rem;
    align-items: start;
  }

  .about-anchor {
    position: sticky;
    top: calc(var(--header-h) + 1.5rem);
  }

  .about-anchor-inner {
    padding: 1.5rem;
  }

  .about-anchor-nav {
    flex-direction: column;
    gap: .25rem;
  }

  .about-anchor-link {
    border-radius: var(--radius-sm);
    padding: .55rem .8rem;
    background: transparent;
  }

  .about-anchor-link:hover {
    background: rgba(184, 255, 41, .18);
    transform: translateX(4px);
  }

  .about-anchor-btn {
    margin-top: 1rem;
  }

  .about-anchor-foot {
    display: flex;
  }
}