.page-about {
  background: var(--c-bg);
  color: var(--c-text);
}

.page-about .about-hero {
  background: var(--c-deep);
  background-image:
    linear-gradient(rgba(0, 255, 157, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 255, 157, 0.04) 1px, transparent 1px);
  background-size: 24px 24px;
  padding: 40px 0 56px;
}

.page-about .about-hero-frame {
  position: relative;
  border: 1px solid rgba(0, 255, 157, 0.35);
  background: rgba(17, 34, 64, 0.6);
  padding: 24px 20px;
  display: grid;
  gap: 24px;
}

.page-about .frame-corner {
  position: absolute;
  width: 16px;
  height: 16px;
  border-color: var(--c-neon);
  border-style: solid;
  border-width: 0;
  pointer-events: none;
}

.page-about .corner-tl {
  top: -1px;
  left: -1px;
  border-top-width: 2px;
  border-left-width: 2px;
}

.page-about .corner-tr {
  top: -1px;
  right: -1px;
  border-top-width: 2px;
  border-right-width: 2px;
}

.page-about .corner-bl {
  bottom: -1px;
  left: -1px;
  border-bottom-width: 2px;
  border-left-width: 2px;
}

.page-about .corner-br {
  bottom: -1px;
  right: -1px;
  border-bottom-width: 2px;
  border-right-width: 2px;
}

.page-about .frame-coord {
  position: absolute;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.4);
  white-space: nowrap;
}

.page-about .frame-coord-a {
  top: -20px;
  right: 0;
}

.page-about .frame-coord-b {
  bottom: -20px;
  left: 0;
}

.page-about .about-hero-content h1 {
  color: #fff;
  font-size: 28px;
  line-height: 1.3;
  margin: 16px 0;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-hero-lead {
  color: rgba(255, 255, 255, 0.75);
  font-size: 15px;
  line-height: 1.8;
  margin: 0 0 24px;
}

.page-about .about-hero-metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 28px;
}

.page-about .hero-metric {
  border-left: 2px solid var(--c-neon);
  padding-left: 12px;
}

.page-about .hero-metric-value {
  display: block;
  font-family: var(--f-mono);
  color: var(--c-neon);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.2;
}

.page-about .hero-metric-label {
  display: block;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.55);
}

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

.page-about .about-hero .btn-ghost {
  border-color: rgba(255, 255, 255, 0.35);
  color: #fff;
}

.page-about .about-hero .btn-ghost:hover,
.page-about .about-hero .btn-ghost:focus-visible {
  border-color: var(--c-neon);
  color: var(--c-neon);
}

.page-about .about-hero-aside {
  border: 1px solid rgba(255, 215, 0, 0.35);
  background: rgba(17, 34, 64, 0.75);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-self: start;
}

.page-about .aside-label {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 0.08em;
  margin-top: 8px;
}

.page-about .aside-label:first-child {
  margin-top: 0;
}

.page-about .aside-value {
  font-size: 15px;
  color: #fff;
}

.page-about .aside-gold {
  color: var(--c-gold);
  font-weight: 700;
}

.page-about .aside-place,
.page-about .aside-icp {
  font-family: var(--f-mono);
  font-size: 13px;
}

.page-about .about-story {
  padding: 64px 0 72px;
  background: var(--c-bg);
}

.page-about .about-story-intro,
.page-about .about-tech-lead,
.page-about .about-cert-lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-gray);
  max-width: 640px;
  margin-top: 16px;
}

.page-about .timeline {
  position: relative;
  margin-top: 40px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--c-deep);
  opacity: 0.15;
}

.page-about .timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 16px;
  align-items: start;
}

.page-about .timeline-index {
  z-index: 1;
  width: 40px;
  height: 40px;
  background: var(--c-deep);
  color: var(--c-neon);
  font-family: var(--f-mono);
  font-size: 15px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .timeline-item:hover .timeline-index,
.page-about .timeline-item:focus-within .timeline-index {
  background: var(--c-neon);
  color: var(--c-deep);
}

.page-about .timeline-body {
  background: #fff;
  border: 1px solid var(--c-line);
  border-left: 4px solid var(--c-cyan);
  padding: 20px;
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .timeline-item:hover .timeline-body,
.page-about .timeline-item:focus-within .timeline-body {
  border-color: var(--c-cyan);
  box-shadow: 0 0 0 1px rgba(0, 184, 169, 0.3);
}

.page-about .timeline-body h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 8px;
}

.page-about .timeline-body p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-gray);
}

.page-about .timeline-tags {
  margin-top: 12px;
}

.page-about .about-milestone-media {
  margin: 40px 0 0;
}

.page-about .about-milestone-media img,
.page-about .about-tech-media img,
.page-about .about-cert-media img {
  max-width: 100%;
  height: auto;
  display: block;
}

.page-about .about-tech {
  background: var(--c-deep);
  background-image:
    linear-gradient(rgba(0, 255, 157, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 255, 157, 0.04) 1px, transparent 1px);
  background-size: 24px 24px;
  padding: 64px 0 72px;
}

.page-about .about-tech .section-title,
.page-about .about-local .section-title {
  color: #fff;
}

.page-about .about-tech .section-index,
.page-about .about-local .section-index {
  color: var(--c-neon);
}

.page-about .about-tech-lead {
  color: rgba(255, 255, 255, 0.6);
}

.page-about .tech-panel-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: 32px 0 40px;
}

.page-about .tech-stat {
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  padding: 20px;
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .tech-stat:hover,
.page-about .tech-stat:focus-within {
  border-color: rgba(0, 255, 157, 0.6);
  background: rgba(17, 34, 64, 0.9);
}

.page-about .tech-stat summary {
  position: relative;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  padding-right: 24px;
}

.page-about .tech-stat summary::-webkit-details-marker {
  display: none;
}

.page-about .tech-stat summary::after {
  content: "+";
  position: absolute;
  top: 0;
  right: 0;
  color: var(--c-neon);
  font-family: var(--f-mono);
  font-size: 18px;
  line-height: 1;
  transition: transform 0.2s var(--ease);
}

.page-about .tech-stat[open] summary::after {
  content: "–";
}

.page-about .tech-stat summary:focus-visible {
  outline: 2px solid var(--c-neon);
  outline-offset: 4px;
}

.page-about .tech-stat .data-label {
  color: rgba(255, 255, 255, 0.55);
  font-size: 13px;
}

.page-about .tech-stat .data-value {
  font-family: var(--f-mono);
  color: var(--c-neon);
  font-size: 28px;
  font-weight: 700;
  line-height: 1.1;
}

.page-about .tech-stat .data-unit {
  color: var(--c-gold);
  font-size: 13px;
}

.page-about .tech-stat-more {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.65);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .tech-layout {
  display: grid;
  gap: 28px;
  align-items: start;
}

.page-about .tech-detail {
  color: rgba(255, 255, 255, 0.75);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .tech-detail h3 {
  color: #fff;
  font-size: 22px;
  margin-bottom: 16px;
  font-weight: 700;
}

.page-about .tech-detail ul {
  list-style: none;
  padding: 0;
  margin: 0 0 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .tech-detail li {
  padding-left: 22px;
  position: relative;
}

.page-about .tech-detail li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 10px;
  height: 10px;
  background: var(--c-neon);
}

.page-about .tech-note {
  border: 1px solid rgba(255, 215, 0, 0.4);
  background: rgba(17, 34, 64, 0.75);
  padding: 16px 18px;
  border-left: 4px solid var(--c-gold);
  color: rgba(255, 255, 255, 0.8);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .tech-note strong {
  color: var(--c-gold);
  font-family: var(--f-mono);
}

.page-about .about-tech-media {
  margin: 0;
}

.page-about .about-certification {
  background: var(--c-bg);
  padding: 64px 0 72px;
}

.page-about .certification-layout {
  display: grid;
  gap: 28px;
  margin-top: 32px;
}

.page-about .qualification-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .qualification-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 18px;
  background: #fff;
  border: 1px solid var(--c-line);
  border-left: 4px solid var(--c-cyan);
  padding: 20px;
  transition: box-shadow 0.2s var(--ease);
}

.page-about .qualification-item:hover {
  box-shadow: 0 4px 20px rgba(10, 25, 47, 0.08);
}

.page-about .qualification-item:nth-child(1) {
  border-left-color: var(--c-cyan);
}

.page-about .qualification-item:nth-child(1) .qualification-icon {
  color: var(--c-cyan);
}

.page-about .qualification-item:nth-child(2) {
  border-left-color: var(--c-green);
}

.page-about .qualification-item:nth-child(2) .qualification-icon {
  color: var(--c-green);
}

.page-about .qualification-item:nth-child(3) {
  border-left-color: var(--c-gold);
}

.page-about .qualification-item:nth-child(3) .qualification-icon {
  color: var(--c-gold);
}

.page-about .qualification-item:nth-child(4) {
  border-left-color: var(--c-deep);
}

.page-about .qualification-item:nth-child(4) .qualification-icon {
  color: var(--c-deep);
}

.page-about .qualification-icon {
  font-family: var(--f-mono);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .qualification-body h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 6px;
}

.page-about .qualification-body p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-gray);
}

.page-about .about-cert-media {
  margin: 0;
}

.page-about .about-local {
  background: var(--c-deep);
  padding: 64px 0 72px;
  color: rgba(255, 255, 255, 0.75);
}

.page-about .local-layout {
  display: grid;
  gap: 28px;
  margin-top: 32px;
}

.page-about .local-info h3 {
  color: #fff;
  font-size: 22px;
  margin: 18px 0 12px;
  font-weight: 700;
}

.page-about .local-info p {
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.8;
  font-size: 15px;
}

.page-about .local-contact-list {
  margin: 24px 0 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 20px;
}

.page-about .local-contact-item dt {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-neon);
  margin-bottom: 4px;
}

.page-about .local-contact-item dd {
  margin: 0;
  color: #fff;
  font-size: 16px;
  line-height: 1.4;
}

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

.page-about .about-local .btn-ghost {
  border-color: rgba(255, 255, 255, 0.35);
  color: #fff;
}

.page-about .about-local .btn-ghost:hover,
.page-about .about-local .btn-ghost:focus-visible {
  border-color: var(--c-neon);
  color: var(--c-neon);
}

.page-about .local-map-visual {
  border: 1px solid rgba(0, 255, 157, 0.35);
  padding: 12px;
  background: var(--c-surface);
  font-family: var(--f-mono);
}

.page-about .local-map-visual svg {
  display: block;
  width: 100%;
  height: auto;
}

@media (min-width: 720px) {
  .page-about .about-hero-frame {
    grid-template-columns: 1fr 220px;
  }

  .page-about .about-hero-metrics {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .tech-panel-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .timeline-item {
    grid-template-columns: 64px 1fr;
  }

  .page-about .timeline::before {
    left: 20px;
  }

  .page-about .about-milestone-media {
    margin-left: 80px;
    width: calc(100% - 80px);
  }
}

@media (min-width: 1000px) {
  .page-about .tech-panel-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .tech-layout,
  .page-about .certification-layout,
  .page-about .local-layout {
    grid-template-columns: 1fr 0.85fr;
  }

  .page-about .qualification-list {
    grid-template-columns: 1fr;
  }

  .page-about .timeline-item {
    grid-template-columns: 120px 1fr;
    gap: 28px;
  }

  .page-about .timeline-index {
    background: transparent;
    color: var(--c-deep);
    font-size: 20px;
    justify-content: flex-end;
    width: auto;
    height: auto;
  }

  .page-about .timeline-item:hover .timeline-index,
  .page-about .timeline-item:focus-within .timeline-index {
    background: transparent;
    color: var(--c-deep);
  }

  .page-about .about-milestone-media {
    margin-left: 148px;
    width: calc(100% - 148px);
  }

  .page-about .about-tech-media {
    margin: 0;
  }

  .page-about .about-cert-media {
    margin: 0;
  }
}