.page-about {
  --ab-container-max: 1180px;
  --ab-space-lg: clamp(56px, 10vw, 96px);
  --ab-space-md: 32px;
  --ab-font-display: var(--font-display);
  --ab-font-mono: var(--font-mono);
  --ab-font-sans: var(--font-sans);
  background: var(--off-white);
  color: var(--ink);
  line-height: 1.75;
  font-family: var(--ab-font-sans);
}

.page-about .ab-container {
  max-width: var(--ab-container-max);
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 44px);
}

.page-about .ab-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: rgba(245, 243, 236, 0.7);
  margin-bottom: 24px;
}

.page-about .ab-breadcrumb a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .ab-breadcrumb a:hover {
  color: var(--amber-accent);
}

.page-about .ab-breadcrumb-current {
  color: var(--lime-bright);
}

.page-about .ab-breadcrumb-sep {
  opacity: 0.5;
}

.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(11, 107, 58, 0.5), transparent 46%),
    var(--green-deep);
  color: var(--white);
  padding-block: 44px 64px;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.5), transparent 90%);
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  top: -70px;
  right: -60px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(166, 211, 60, 0.16), transparent 66%);
  pointer-events: none;
}

.page-about .ab-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 36px;
}

.page-about .ab-hero-title {
  font-family: var(--ab-font-display);
  font-size: clamp(28px, 5vw, 44px);
  font-weight: 900;
  line-height: 1.15;
  margin: 0 0 14px;
  color: var(--white);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.3em;
}

.page-about .ab-hero-title-dash {
  color: var(--orange-core);
  font-weight: 400;
}

.page-about .ab-hero-title-sub {
  font-size: 0.7em;
  font-weight: 500;
  color: rgba(245, 243, 236, 0.82);
}

.page-about .ab-hero-desc {
  font-size: 16px;
  color: rgba(245, 243, 236, 0.78);
  max-width: 560px;
  margin: 0;
  line-height: 1.8;
}

.page-about .ab-hero-actions {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-hero-graph {
  display: block;
  width: 100%;
  height: auto;
  margin-top: 26px;
  max-height: 220px;
}

.page-about .ab-hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 20px;
}

.page-about .ab-update-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--ab-font-mono);
  font-size: 13px;
  padding: 6px 12px;
  border: 1px solid rgba(166, 211, 60, 0.5);
  border-radius: 999px;
  background: rgba(10, 30, 24, 0.5);
  color: var(--lime-bright);
}

.page-about .ab-update-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--lime-bright);
  animation: ab-breathe 2.2s ease-out infinite;
}

.page-about .ab-hero-note {
  font-size: 13px;
  color: rgba(245, 243, 236, 0.6);
}

.page-about .ab-hero-index {
  background: rgba(10, 30, 24, 0.48);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 14px;
  padding: 22px 20px;
  position: relative;
}

.page-about .ab-index-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
  margin-bottom: 8px;
}

.page-about .ab-index-title {
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(245, 243, 236, 0.62);
}

.page-about .ab-index-count {
  font-family: var(--ab-font-mono);
  font-size: 13px;
  color: var(--orange-core);
}

.page-about .ab-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-index-item + .ab-index-item {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.page-about .ab-index-link {
  display: block;
  padding: 12px 6px;
  text-decoration: none;
  color: var(--white);
  border-radius: 6px;
  transition: background 0.25s ease, padding-left 0.25s ease;
}

.page-about .ab-index-link:hover,
.page-about .ab-index-link:focus-visible {
  background: rgba(255, 255, 255, 0.05);
  padding-left: 12px;
}

.page-about .ab-index-num {
  display: inline-block;
  width: 40px;
  font-family: var(--ab-font-mono);
  font-size: 13px;
  color: var(--amber-accent);
}

.page-about .ab-index-name {
  font-weight: 700;
  font-size: 16px;
}

.page-about .ab-index-brief {
  display: block;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 13px;
  color: rgba(245, 243, 236, 0.66);
  transition: max-height 0.35s ease, opacity 0.3s ease, margin-top 0.3s ease;
}

.page-about .ab-index-link:hover .ab-index-brief,
.page-about .ab-index-link:focus-visible .ab-index-brief {
  max-height: 60px;
  opacity: 1;
  margin-top: 6px;
}

.page-about .ab-index-foot {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}

.page-about .ab-index-footlink {
  color: var(--orange-core);
  text-decoration: none;
  font-weight: 700;
  font-size: 14px;
  transition: opacity 0.2s ease;
}

.page-about .ab-index-footlink:hover {
  opacity: 0.8;
}

.page-about .ab-sec-head {
  --ab-sec-line: rgba(17, 17, 17, 0.12);
  display: flex;
  align-items: center;
  gap: 14px;
  padding-bottom: 14px;
  margin-bottom: clamp(24px, 5vw, 40px);
  border-bottom: 2px solid var(--ab-sec-line);
  scroll-margin-top: calc(var(--header-h) + 20px);
}

.page-about .ab-sec-num {
  font-family: var(--ab-font-mono);
  font-size: 14px;
  color: var(--orange-core);
  border: 1px solid var(--orange-core);
  padding: 2px 9px;
  border-radius: 6px;
  white-space: nowrap;
}

.page-about .ab-sec-titlewrap {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
}

.page-about .ab-sec-title {
  font-family: var(--ab-font-display);
  font-size: clamp(22px, 3vw, 31px);
  line-height: 1.22;
  margin: 0;
  font-weight: 900;
  color: var(--ink);
}

.page-about .ab-sec-en {
  font-family: var(--ab-font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-mute);
}

.page-about .ab-story {
  background: var(--off-white);
  padding-block: var(--ab-space-lg);
}

.page-about .ab-story-grid {
  display: grid;
  gap: 32px;
}

.page-about .ab-story-copy p {
  font-size: 16px;
  margin: 0 0 18px;
  color: var(--text-mute);
}

.page-about .ab-dropcap::first-letter {
  font-size: 3.1em;
  font-weight: 900;
  color: var(--green-mid);
  float: left;
  line-height: 0.84;
  margin-right: 10px;
}

.page-about .ab-story-figure {
  margin: 0;
  position: relative;
}

.page-about .ab-story-figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 10px;
  box-shadow: 0 18px 50px rgba(6, 45, 34, 0.16);
  transform: rotate(1deg);
}

.page-about .ab-story-figure figcaption {
  font-size: 13px;
  color: var(--text-mute);
  margin-top: 12px;
  padding-left: 12px;
  border-left: 3px solid var(--orange-core);
}

.page-about .ab-timeline-sec {
  background:
    linear-gradient(180deg, var(--dark-void), var(--green-deep));
  color: var(--white);
  padding-block: var(--ab-space-lg);
}

.page-about .ab-timeline-sec .ab-sec-head {
  --ab-sec-line: rgba(255, 255, 255, 0.16);
}

.page-about .ab-timeline-sec .ab-sec-title {
  color: var(--white);
}

.page-about .ab-timeline-sec .ab-sec-en {
  color: rgba(245, 243, 236, 0.55);
}

.page-about .ab-timeline-layout {
  display: grid;
  gap: 36px;
}

.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(to bottom, var(--lime-bright), var(--green-mid) 58%, var(--orange-core));
  opacity: 0.65;
}

.page-about .ab-timeline-item {
  position: relative;
  padding-left: 52px;
  padding-bottom: 36px;
}

.page-about .ab-timeline-item:last-child {
  padding-bottom: 0;
}

.page-about .ab-timeline-item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--dark-void);
  border: 3px solid var(--lime-bright);
  box-shadow: 0 0 0 4px rgba(6, 45, 34, 0.4);
  box-sizing: border-box;
}

.page-about .ab-timeline-item:last-child::before {
  border-color: var(--orange-core);
}

.page-about .ab-tl-year {
  display: inline-block;
  font-family: var(--ab-font-mono);
  color: var(--amber-accent);
  font-size: 14px;
  letter-spacing: 0.08em;
  margin-bottom: 4px;
}

.page-about .ab-tl-title {
  font-family: var(--ab-font-display);
  font-size: 20px;
  margin: 0 0 6px;
  color: var(--white);
}

.page-about .ab-tl-text {
  font-size: 14.5px;
  color: rgba(245, 243, 236, 0.72);
  margin: 0;
  line-height: 1.7;
}

.page-about .ab-timeline-figure {
  margin: 0;
  transform: rotate(-1.5deg);
}

.page-about .ab-timeline-figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 22px 60px rgba(0, 0, 0, 0.4);
}

.page-about .ab-timeline-figure figcaption {
  font-size: 13px;
  color: rgba(245, 243, 236, 0.6);
  margin-top: 12px;
  padding-left: 12px;
  border-left: 3px solid var(--lime-bright);
}

.page-about .ab-quality {
  background: var(--off-white);
  padding-block: var(--ab-space-lg);
}

.page-about .ab-quality-layout {
  display: grid;
  gap: 36px;
}

.page-about .ab-quality-figure {
  margin: 0;
}

.page-about .ab-quality-figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 14px;
  max-width: 560px;
  margin-inline: auto;
}

.page-about .ab-quality-main {
  min-width: 0;
}

.page-about .ab-quality-lead {
  font-size: 18px;
  font-weight: 500;
  line-height: 1.7;
  margin: 0 0 24px;
  color: var(--ink);
}

.page-about .ab-stat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-bottom: 26px;
}

.page-about .ab-stat-card {
  background: var(--white);
  border: 1px solid var(--gray-line);
  border-radius: 10px;
  padding: 18px 12px;
  text-align: center;
  box-shadow: 0 4px 14px rgba(6, 45, 34, 0.06);
}

.page-about .ab-stat-num {
  display: block;
  font-family: var(--ab-font-mono);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  color: var(--green-deep);
  line-height: 1.2;
}

.page-about .ab-stat-label {
  display: block;
  font-size: 12.5px;
  color: var(--text-mute);
  margin-top: 6px;
}

.page-about .ab-check {
  background: var(--white);
  border: 1px solid var(--gray-line);
  border-radius: 12px;
  padding: 20px 20px 12px;
  box-shadow: 0 4px 14px rgba(6, 45, 34, 0.04);
}

.page-about .ab-check-title {
  font-size: 16px;
  margin: 0 0 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
}

.page-about .ab-check-title::before {
  content: "";
  width: 8px;
  height: 20px;
  background: var(--orange-core);
  border-radius: 2px;
}

.page-about .ab-check-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: abcheck;
}

.page-about .ab-check-list li {
  counter-increment: abcheck;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--gray-line);
  font-size: 14.5px;
  align-items: baseline;
}

.page-about .ab-check-list li:last-child {
  border-bottom: none;
}

.page-about .ab-check-list li::before {
  content: counter(abcheck, decimal-leading-zero);
  font-family: var(--ab-font-mono);
  color: var(--orange-core);
  font-size: 13px;
}

.page-about .ab-check-list strong {
  min-width: 112px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .ab-check-list span {
  color: var(--text-mute);
  flex: 1;
  min-width: 200px;
}

.page-about .ab-quality-sync {
  font-size: 14px;
  color: var(--text-mute);
  margin: 20px 0 0;
  padding: 12px 16px;
  border-left: 3px solid var(--green-mid);
  background: rgba(11, 107, 58, 0.05);
  border-radius: 0 6px 6px 0;
}

.page-about .ab-team {
  background: var(--green-deep);
  color: var(--white);
  padding-block: var(--ab-space-lg);
}

.page-about .ab-team .ab-sec-head {
  --ab-sec-line: rgba(255, 255, 255, 0.16);
}

.page-about .ab-team .ab-sec-title {
  color: var(--white);
}

.page-about .ab-team .ab-sec-en {
  color: rgba(245, 243, 236, 0.55);
}

.page-about .ab-team-lead {
  font-size: 17px;
  line-height: 1.7;
  color: rgba(245, 243, 236, 0.8);
  max-width: 720px;
  margin: 0 0 40px;
}

.page-about .ab-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .ab-team-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 12px;
  padding: 24px 20px;
  position: relative;
  transition: transform 0.3s var(--ease), border-color 0.3s ease;
}

.page-about .ab-team-card:hover {
  transform: translateY(-6px) rotate(-1deg);
  border-color: rgba(249, 90, 0, 0.7);
}

.page-about .ab-team-code {
  font-family: var(--ab-font-mono);
  font-size: 13px;
  color: var(--amber-accent);
}

.page-about .ab-team-name {
  font-size: 19px;
  margin: 10px 0 8px;
  color: var(--white);
}

.page-about .ab-team-desc {
  font-size: 14px;
  color: rgba(245, 243, 236, 0.7);
  margin: 0;
  line-height: 1.65;
}

.page-about .ab-contact {
  background: var(--off-white);
  padding-block: var(--ab-space-lg);
}

.page-about .ab-contact-grid {
  display: grid;
  gap: 32px;
}

.page-about .ab-contact-copy p {
  color: var(--text-mute);
  margin: 0 0 18px;
}

.page-about .ab-contact-list {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  border-top: 1px solid var(--gray-line);
}

.page-about .ab-contact-list li {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  padding: 15px 0;
  border-bottom: 1px solid var(--gray-line);
}

.page-about .ab-contact-label {
  width: 56px;
  font-size: 13px;
  color: var(--text-mute);
  font-family: var(--ab-font-mono);
}

.page-about .ab-contact-value {
  font-size: 15px;
  text-decoration: none;
  color: var(--ink);
  font-weight: 500;
  word-break: break-word;
}

.page-about a.ab-contact-value {
  transition: color 0.2s ease;
}

.page-about a.ab-contact-value:hover {
  color: var(--orange-core);
}

.page-about .ab-contact-note {
  font-size: 14px;
  color: var(--text-mute);
}

.page-about .ab-contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .ab-contact-commit {
  background: var(--green-deep);
  border-radius: 14px;
  padding: 32px 28px;
  color: var(--white);
  position: relative;
  overflow: hidden;
}

.page-about .ab-contact-commit::before {
  content: "";
  position: absolute;
  right: -30px;
  top: -30px;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(249, 90, 0, 0.4), transparent 68%);
  pointer-events: none;
}

.page-about .ab-commit-kicker {
  font-family: var(--ab-font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lime-bright);
}

.page-about .ab-commit-title {
  font-size: 24px;
  margin: 8px 0 12px;
  color: var(--white);
}

.page-about .ab-commit-text {
  color: rgba(245, 243, 236, 0.75);
  font-size: 14.5px;
  line-height: 1.7;
  margin: 0 0 10px;
}

.page-about .ab-commit-text a {
  color: var(--amber-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.page-about .scroll-top {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 60;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--orange-core);
  color: var(--white);
  border: none;
  font-size: 12px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
}

.page-about .scroll-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.page-about .scroll-top:hover {
  transform: translateY(-4px);
  background: var(--amber-accent);
}

.page-about .ab-story,
.page-about .ab-timeline-sec,
.page-about .ab-quality,
.page-about .ab-team,
.page-about .ab-contact {
  scroll-margin-top: calc(var(--header-h) + 16px);
}

.page-about .ab-story:target .ab-sec-head,
.page-about .ab-timeline-sec:target .ab-sec-head,
.page-about .ab-quality:target .ab-sec-head,
.page-about .ab-team:target .ab-sec-head,
.page-about .ab-contact:target .ab-sec-head {
  animation: ab-tag-flash 1.8s ease;
}

@keyframes ab-breathe {
  0% {
    box-shadow: 0 0 0 0 rgba(166, 211, 60, 0.6);
  }
  70% {
    box-shadow: 0 0 0 8px rgba(166, 211, 60, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(166, 211, 60, 0);
  }
}

@keyframes ab-tag-flash {
  0% {
    background: rgba(249, 90, 0, 0.14);
  }
  100% {
    background: transparent;
  }
}

@supports (animation-timeline: view()) {
  .page-about .ab-timeline-item {
    animation: ab-timeline-enter 0.7s ease-out both;
    animation-timeline: view();
  }
}

@keyframes ab-timeline-enter {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (min-width: 640px) {
  .page-about .ab-team-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .ab-story-figure {
    margin-left: 24px;
  }

  .page-about .ab-timeline-figure {
    margin-right: 24px;
  }
}

@media (min-width: 980px) {
  .page-about .ab-hero {
    padding-block: 64px 88px;
  }

  .page-about .ab-hero-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(300px, 0.75fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-hero-index {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .ab-story-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .ab-timeline-layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(260px, 0.85fr);
    gap: 60px;
    align-items: start;
  }

  .page-about .ab-timeline-figure {
    margin-top: 72px;
  }

  .page-about .ab-quality-layout {
    grid-template-columns: minmax(280px, 0.8fr) minmax(0, 1.2fr);
    gap: 64px;
    align-items: center;
  }

  .page-about .ab-quality-figure img {
    margin-inline: 0;
  }

  .page-about .ab-team-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
  }

  .page-about .ab-contact-grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 64px;
    align-items: start;
  }

  .page-about .ab-contact-commit {
    margin-top: 12px;
  }
}

@media (min-width: 1200px) {
  .page-about .ab-timeline-figure {
    margin-left: -30px;
  }
}