.page-about {
  --c-brown: #2B1208;
  --c-ice: #00E5FF;
  --c-ink: #0A0F1E;
  --c-neon: #C6FF4D;
  --c-orange: #FF6B35;
  --c-paper: #F4E9D8;
  --c-stone: #8B93A7;
  --c-white: #FFFFFF;
  --font-data: 'Roboto Mono', 'SFMono-Regular', Consolas, monospace;
  --font-sans: system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--c-ink);
  color: var(--c-paper);
  min-height: 100vh;
}

.page-about .archive-shell {
  min-height: 100vh;
  background: var(--c-ink);
}

.page-about .archive-toc {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(10, 15, 30, 0.96);
  border-bottom: 1px solid rgba(198, 255, 77, 0.25);
  padding: 16px 20px 14px;
}

.page-about .archive-toc__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 12px;
}

.page-about .archive-toc__brand {
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--c-paper);
}

.page-about .archive-toc__cap {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--c-stone);
}

.page-about .archive-toc__nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .archive-toc__nav::-webkit-scrollbar {
  display: none;
}

.page-about .archive-toc__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  color: var(--c-paper);
  background: rgba(244, 233, 216, 0.06);
  border: 1px solid rgba(244, 233, 216, 0.18);
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
  transition: background 0.2s ease, color 0.2s ease;
}

.page-about .archive-toc__link span {
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--c-neon);
}

.page-about .archive-toc__link.is-active {
  background: var(--c-neon);
  color: var(--c-ink);
  border-color: var(--c-neon);
}

.page-about .archive-toc__link.is-active span {
  color: var(--c-ink);
}

.page-about .archive-toc__link:hover,
.page-about .archive-toc__link:focus-visible {
  background: var(--c-neon);
  color: var(--c-ink);
  border-color: var(--c-neon);
  outline: none;
}

.page-about .archive-toc__link:hover span,
.page-about .archive-toc__link:focus-visible span {
  color: var(--c-ink);
}

.page-about .archive-toc__foot {
  display: none;
}

.page-about .archive-body {
  background: var(--c-paper);
  color: var(--c-brown);
  padding: 32px 20px 56px;
  position: relative;
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  font-size: 13px;
  color: var(--c-stone);
}

.page-about .breadcrumb a {
  color: var(--c-ink);
  text-decoration: none;
  border-bottom: 1px solid rgba(10, 15, 30, 0.25);
}

.page-about .breadcrumb a:hover {
  border-bottom-color: var(--c-orange);
}

.page-about .profile-block__kicker {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-orange);
  padding: 6px 14px 6px 12px;
  background: var(--c-ink);
  clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
  margin-bottom: 16px;
}

.page-about .profile-block h1 {
  font-family: var(--font-sans);
  font-size: clamp(28px, 6vw, 52px);
  font-weight: 800;
  font-style: italic;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--c-ink);
  margin: 0 0 20px;
}

.page-about .profile-block__lead {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: rgba(43, 18, 8, 0.82);
  border-left: 4px solid var(--c-orange);
  padding-left: 16px;
  margin: 0 0 32px;
}

.page-about .profile-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin: 0;
}

.page-about .profile-stat {
  background: var(--c-ink);
  color: var(--c-paper);
  padding: 20px 16px;
  clip-path: polygon(12px 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .profile-stat__num {
  font-family: var(--font-data);
  font-size: clamp(26px, 5vw, 40px);
  font-weight: 700;
  color: var(--c-neon);
  line-height: 1;
}

.page-about .profile-stat__label {
  font-family: var(--font-sans);
  font-size: 13px;
  color: rgba(244, 233, 216, 0.7);
  margin: 0;
}

.page-about .section-head {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 0 0 28px;
  padding-bottom: 14px;
  border-bottom: 2px solid rgba(10, 15, 30, 0.14);
}

.page-about .section-head__text {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .section-head__index {
  font-family: var(--font-data);
  font-size: 34px;
  font-weight: 700;
  color: var(--c-orange);
  line-height: 1;
}

.page-about .section-head h2 {
  font-family: var(--font-sans);
  font-size: 28px;
  font-weight: 800;
  color: var(--c-ink);
  margin: 0;
  letter-spacing: -0.01em;
}

.page-about .section-head p {
  font-size: 14px;
  color: rgba(43, 18, 8, 0.62);
  margin: 0;
  line-height: 1.5;
}

.page-about .timeline-section {
  margin-top: 56px;
}

.page-about .timeline-banner {
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  display: block;
  margin-bottom: 28px;
  border: 1px solid rgba(10, 15, 30, 0.12);
}

.page-about .timeline-list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
  border-left: 3px solid rgba(10, 15, 30, 0.18);
  display: flex;
  flex-direction: column;
  gap: 0;
}

.page-about .timeline-item {
  position: relative;
  padding-bottom: 24px;
}

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

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 8px;
  width: 14px;
  height: 14px;
  background: var(--c-neon);
  border: 3px solid var(--c-ink);
  transform: rotate(45deg);
  box-shadow: 0 0 0 2px var(--c-paper);
}

.page-about .timeline-item__detail summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 12px 14px;
  background: var(--c-white);
  border: 1px solid rgba(10, 15, 30, 0.12);
  border-left: 4px solid var(--c-ink);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .timeline-item__detail summary::-webkit-details-marker {
  display: none;
}

.page-about .timeline-item__detail summary:hover,
.page-about .timeline-item__detail summary:focus-visible {
  outline: none;
  border-left-color: var(--c-orange);
  transform: translateX(4px);
}

.page-about .timeline-item__year {
  font-family: var(--font-data);
  font-size: 24px;
  font-weight: 700;
  color: var(--c-orange);
  line-height: 1;
}

.page-about .timeline-item__name {
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 700;
  color: var(--c-ink);
}

.page-about .timeline-item__detail p {
  margin: 10px 0 0;
  padding: 0 4px;
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.6;
  color: rgba(43, 18, 8, 0.72);
  border-left: 3px solid var(--c-neon);
  background: rgba(198, 255, 77, 0.1);
  padding-left: 12px;
}

.page-about .capability-section {
  margin-top: 56px;
  background: var(--c-ink);
  color: var(--c-paper);
  padding: 32px 20px 36px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), 14px 100%);
}

.page-about .capability-section .section-head {
  border-bottom-color: rgba(244, 233, 216, 0.18);
}

.page-about .capability-section .section-head h2 {
  color: var(--c-paper);
}

.page-about .capability-section .section-head p {
  color: rgba(244, 233, 216, 0.62);
}

.page-about .capability-grid {
  display: grid;
  gap: 24px;
}

.page-about .capability-radar img {
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: contain;
  background: rgba(244, 233, 216, 0.05);
  border: 1px solid rgba(198, 255, 77, 0.2);
}

.page-about .capability-panel {
  position: relative;
}

.page-about .cap-tab-input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.page-about .capability-panel__tabs {
  display: flex;
  gap: 0;
  margin-bottom: 18px;
}

.page-about .capability-panel__tabs label {
  flex: 1;
  text-align: center;
  padding: 12px 8px;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 700;
  color: rgba(244, 233, 216, 0.55);
  background: rgba(244, 233, 216, 0.06);
  border: 1px solid rgba(244, 233, 216, 0.12);
  border-right: 0;
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}

.page-about .capability-panel__tabs label:last-child {
  border-right: 1px solid rgba(244, 233, 216, 0.12);
}

.page-about .capability-panel__tabs label:hover,
.page-about .capability-panel__tabs label:focus-within {
  background: rgba(198, 255, 77, 0.12);
  color: var(--c-paper);
}

.page-about #cap-live:checked ~ .capability-panel__tabs label[for="cap-live"],
.page-about #cap-hist:checked ~ .capability-panel__tabs label[for="cap-hist"],
.page-about #cap-replay:checked ~ .capability-panel__tabs label[for="cap-replay"] {
  background: var(--c-neon);
  color: var(--c-ink);
  border-color: var(--c-neon);
}

.page-about .cap-panel {
  display: none;
}

.page-about #cap-live:checked ~ .cap-panel--live,
.page-about #cap-hist:checked ~ .cap-panel--hist,
.page-about #cap-replay:checked ~ .cap-panel--replay {
  display: block;
}

.page-about .cap-panel ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .cap-panel li {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.5;
  color: rgba(244, 233, 216, 0.88);
  padding: 12px 16px;
  background: rgba(244, 233, 216, 0.07);
  border-left: 3px solid var(--c-ice);
}

.page-about .capability-note {
  margin-top: 28px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 233, 216, 0.72);
  border-top: 1px solid rgba(244, 233, 216, 0.14);
  padding-top: 18px;
}

.page-about .team-section {
  margin-top: 56px;
}

.page-about .team-layout {
  display: grid;
  gap: 24px;
}

.page-about .team-visual img {
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid rgba(10, 15, 30, 0.12);
}

.page-about .team-meta {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .team-meta__number {
  display: flex;
  align-items: baseline;
  gap: 12px;
  background: var(--c-ink);
  color: var(--c-paper);
  padding: 18px 20px;
  clip-path: polygon(12px 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
}

.page-about .team-num {
  font-family: var(--font-data);
  font-size: 46px;
  font-weight: 700;
  color: var(--c-neon);
  line-height: 1;
}

.page-about .team-num__label {
  font-size: 14px;
  font-weight: 600;
  color: rgba(244, 233, 216, 0.76);
}

.page-about .team-tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .team-tag {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  color: var(--c-ink);
  background: var(--c-white);
  border: 1px solid rgba(10, 15, 30, 0.14);
  clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
}

.page-about .team-tag span {
  font-family: var(--font-data);
  font-size: 24px;
  font-weight: 700;
  color: var(--c-orange);
  min-width: 56px;
}

.page-about .team-desc {
  margin-top: 26px;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(43, 18, 8, 0.76);
  border-top: 1px dashed rgba(10, 15, 30, 0.18);
  padding-top: 20px;
}

.page-about .cert-section {
  margin-top: 56px;
  background: var(--c-ink);
  color: var(--c-paper);
  padding: 32px 20px 36px;
  clip-path: polygon(14px 0, 100% 0, 100% 100%, 0 calc(100% - 18px));
}

.page-about .cert-section .section-head {
  border-bottom-color: rgba(244, 233, 216, 0.18);
}

.page-about .cert-section .section-head h2 {
  color: var(--c-paper);
}

.page-about .cert-section .section-head p {
  color: rgba(244, 233, 216, 0.62);
}

.page-about .cert-grid {
  display: grid;
  gap: 20px;
}

.page-about .cert-card {
  perspective: 1000px;
  height: 240px;
}

.page-about .cert-card__inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.5s ease;
  transform-style: preserve-3d;
}

.page-about .cert-card:hover .cert-card__inner,
.page-about .cert-card:focus-within .cert-card__inner,
.page-about .cert-card:focus .cert-card__inner {
  transform: rotateY(180deg);
}

.page-about .cert-card__front,
.page-about .cert-card__back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 14px;
  border: 1px solid rgba(244, 233, 216, 0.2);
  background: rgba(244, 233, 216, 0.06);
  color: var(--c-paper);
}

.page-about .cert-card__back {
  transform: rotateY(180deg);
  background: var(--c-paper);
  color: var(--c-brown);
  border-color: rgba(10, 15, 30, 0.14);
  align-items: flex-start;
}

.page-about .cert-card__back p {
  font-size: 14px;
  line-height: 1.65;
  margin: 0;
  color: rgba(43, 18, 8, 0.78);
}

.page-about .cert-card__seal {
  display: inline-grid;
  place-items: center;
  width: 92px;
  height: 92px;
  border: 3px solid var(--c-orange);
  border-radius: 50%;
  color: var(--c-orange);
  font-family: var(--font-data);
  font-size: 13px;
  font-weight: 700;
  text-align: center;
  line-height: 1.2;
  padding: 10px;
  transform: rotate(-12deg);
}

.page-about .cert-card__front h3 {
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 700;
  margin: 0;
  text-align: center;
  color: var(--c-paper);
}

.page-about .philosophy-section {
  margin-top: 56px;
}

.page-about .philosophy-quote {
  background: var(--c-ink);
  color: var(--c-neon);
  margin: 0 0 28px;
  padding: 42px 24px;
  font-family: var(--font-sans);
  font-size: clamp(28px, 6vw, 52px);
  font-weight: 800;
  font-style: italic;
  letter-spacing: -0.02em;
  line-height: 1.2;
  text-align: center;
  clip-path: polygon(0 0, 100% 6%, 96% 100%, 4% 94%);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .philosophy-desc {
  font-size: 15px;
  line-height: 1.75;
  color: rgba(43, 18, 8, 0.78);
  margin: 0 0 28px;
}

.page-about .philosophy-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .philosophy-links .btn {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  padding: 12px 22px;
  border: 1px solid var(--c-ink);
  color: var(--c-ink);
  background: transparent;
  clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.page-about .philosophy-links .btn--accent {
  background: var(--c-ink);
  color: var(--c-neon);
  border-color: var(--c-ink);
}

.page-about .philosophy-links .btn:hover,
.page-about .philosophy-links .btn:focus-visible {
  background: var(--c-orange);
  color: var(--c-ink);
  border-color: var(--c-orange);
  outline: none;
}

@media (min-width: 960px) {
  .page-about .archive-shell {
    display: grid;
    grid-template-columns: var(--sidebar-w) 1fr;
    min-height: calc(100vh - var(--header-h));
  }

  .page-about .archive-toc {
    position: sticky;
    top: var(--header-h);
    align-self: start;
    height: calc(100vh - var(--header-h));
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 32px 20px;
    border-bottom: 0;
    border-right: 1px solid rgba(198, 255, 77, 0.2);
    background: var(--c-ink);
  }

  .page-about .archive-toc__head {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    margin-bottom: 32px;
  }

  .page-about .archive-toc__brand {
    font-size: 20px;
  }

  .page-about .archive-toc__nav {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
  }

  .page-about .archive-toc__link {
    justify-content: flex-start;
    padding: 12px 16px;
    clip-path: polygon(12px 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
  }

  .page-about .archive-toc__foot {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-family: var(--font-sans);
    font-size: 14px;
    font-weight: 600;
    color: var(--c-stone);
    border-left: 3px solid var(--c-neon);
    padding-left: 12px;
  }

  .page-about .archive-body {
    padding: 48px 56px 80px;
    max-width: 1240px;
  }

  .page-about .profile-stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
  }

  .page-about .profile-stat {
    padding: 24px 20px;
  }

  .page-about .section-head {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-end;
    gap: 24px;
  }

  .page-about .section-head p {
    max-width: 360px;
    text-align: right;
  }

  .page-about .section-head__index {
    font-size: 42px;
  }

  .page-about .section-head h2 {
    font-size: 34px;
  }

  .page-about .timeline-list {
    flex-direction: row;
    gap: 24px;
    border-left: 0;
    padding-left: 0;
  }

  .page-about .timeline-item {
    flex: 1;
    padding-bottom: 0;
    border-top: 3px solid rgba(10, 15, 30, 0.2);
    padding-top: 20px;
  }

  .page-about .timeline-item::before {
    left: 0;
    top: -9px;
  }

  .page-about .timeline-item__detail summary {
    padding: 14px 16px;
  }

  .page-about .timeline-item__detail p {
    padding: 12px;
  }

  .page-about .capability-section {
    padding: 40px 32px 48px;
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), 28px 100%);
  }

  .page-about .capability-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    align-items: center;
  }

  .page-about .capability-radar img {
    max-height: 520px;
  }

  .page-about .capability-panel__tabs label {
    padding: 14px 12px;
    font-size: 16px;
  }

  .page-about .team-layout {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 28px;
    align-items: start;
  }

  .page-about .team-visual img {
    height: 100%;
    object-fit: cover;
  }

  .page-about .team-meta {
    gap: 24px;
  }

  .page-about .team-tags {
    gap: 12px;
  }

  .page-about .cert-section {
    padding: 40px 32px 48px;
    clip-path: polygon(28px 0, 100% 0, 100% calc(100% - 24px), 0 100%);
  }

  .page-about .cert-grid {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }

  .page-about .cert-card {
    height: 260px;
  }

  .page-about .philosophy-quote {
    padding: 56px 40px;
  }

  .page-about .philosophy-links {
    flex-wrap: nowrap;
  }
}