.page-about {
  --about-rail: 88px;
  --about-offset: clamp(0px, 4vw, 72px);
  background: var(--bg-main);
  color: var(--ink);
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 18px 20px 0;
  font-size: 12px;
  color: var(--ink-dim);
}
.page-about .breadcrumbs a {
  color: var(--ink-dim);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}
.page-about .breadcrumbs a:hover {
  color: var(--green);
}

.page-about .about-hero {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: 480px;
  margin: 0;
  padding: 96px 20px 64px;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}
.page-about .about-hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
  background: var(--bg-deep);
}
.page-about .about-hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(180deg, rgba(6, 19, 29, .32) 0%, rgba(6, 19, 29, .06) 48%, var(--bg-main) 96%),
    linear-gradient(90deg, rgba(6, 19, 29, .5) 0%, transparent 72%);
}
.page-about .about-hero-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 36%;
  filter: saturate(.78) contrast(1.12);
}
.page-about .about-hero-inner {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: flex-end;
  gap: 18px;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
}
.page-about .about-hero-inner::before {
  content: "";
  position: absolute;
  right: -220px;
  bottom: -320px;
  z-index: 0;
  width: 640px;
  height: 640px;
  border: 2px solid rgba(242, 247, 250, .06);
  border-radius: 50%;
  pointer-events: none;
}
.page-about .about-hero-inner::after {
  content: "";
  position: absolute;
  right: 10%;
  bottom: -260px;
  z-index: 0;
  width: 340px;
  height: 340px;
  border: 1px solid rgba(242, 247, 250, .05);
  border-radius: 50%;
  pointer-events: none;
}
.page-about .about-hero-inner > * {
  position: relative;
  z-index: 1;
}
.page-about .about-hero-kicker {
  display: block;
  margin-bottom: 12px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .12em;
  color: var(--green);
}
.page-about .about-hero-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(48px, 11vw, 128px);
  font-weight: 900;
  line-height: .96;
  letter-spacing: -.03em;
  color: var(--ink);
}
.page-about .about-hero-note {
  flex-shrink: 0;
  writing-mode: vertical-rl;
  font-size: 12px;
  line-height: 1.8;
  letter-spacing: .32em;
  color: var(--ink-dim);
  padding-left: 10px;
  border-left: 1px solid var(--line-strong);
}
.page-about .about-hero-actions {
  position: relative;
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  width: 100%;
  max-width: var(--container);
  margin: 28px auto 0;
}

.page-about .about-section {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  max-width: var(--container);
  margin: 0 auto;
  padding: clamp(52px, 8vw, 112px) 20px clamp(48px, 7vw, 96px);
  border-bottom: 1px solid var(--line);
}
.page-about .about-section-rail {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  min-height: 26px;
}
.page-about .about-rail-num {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--orange);
  line-height: 1.4;
}
.page-about .about-rail-caption {
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--ink-dim);
  writing-mode: vertical-rl;
  line-height: 1.8;
}
.page-about .about-rail-next {
  margin-left: auto;
  align-self: center;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-dim);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .about-rail-next:hover {
  color: var(--orange);
  border-color: var(--orange);
}

.page-about .about-section-body {
  min-width: 0;
  max-width: 880px;
}
.page-about .about-section-title {
  margin: 6px 0 16px;
  font-family: var(--font-head);
  font-size: clamp(28px, 4.4vw, 50px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--ink);
}
.page-about .about-section-lead {
  margin: 0 0 18px;
  font-size: 16px;
  font-weight: 500;
  color: var(--green);
}
.page-about .about-section-body > p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-dim);
}

.page-about .about-origin {
  background:
    radial-gradient(circle at 88% 12%, rgba(61, 220, 106, .08) 0%, transparent 42%),
    repeating-linear-gradient(90deg, transparent 0 180px, rgba(242, 247, 250, .016) 180px 181px);
}
.page-about .about-origin .about-section-body::after {
  content: "2016 → 2024";
  display: inline-block;
  margin-top: 22px;
  padding-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--green);
  border-bottom: 1px solid var(--line);
}
.page-about .about-origin-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about .about-milestone {
  background:
    linear-gradient(135deg, transparent 0%, transparent calc(100% - 220px), rgba(255, 122, 26, .05) calc(100% - 220px), rgba(255, 122, 26, .05) 100%);
}
.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 14px;
  margin: 28px 0 20px;
  padding-left: 30px;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 16px;
  bottom: 16px;
  width: 2px;
  background: linear-gradient(180deg, var(--green) 0%, var(--line-strong) 32%, var(--line-strong) 70%, var(--orange) 100%);
}
.page-about .about-timeline-item {
  position: relative;
  margin: 0;
}
.page-about .about-timeline-detail summary {
  position: relative;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
  padding: 14px 18px;
  list-style: none;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.page-about .about-timeline-detail summary::-webkit-details-marker {
  display: none;
}
.page-about .about-timeline-detail summary::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 18px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 122, 26, .16);
}
.page-about .about-timeline-detail:hover summary {
  background: var(--bg-panel-2);
  border-color: var(--line-strong);
}
.page-about .about-timeline-detail[open] summary {
  border-left: 3px solid var(--orange);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}
.page-about .about-timeline-year {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 500;
  color: var(--green);
}
.page-about .about-timeline-name {
  flex-shrink: 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}
.page-about .about-timeline-detail > p {
  margin: 0;
  padding: 14px 18px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-dim);
  background: rgba(10, 30, 46, .78);
  border: 1px solid var(--line);
  border-top: 0;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.page-about .about-milestone-figure,
.page-about .about-stats-figure {
  margin: 24px 0 0;
}
.page-about .about-milestone-figure img,
.page-about .about-stats-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: 0 18px 44px rgba(0, 11, 18, .24);
}
.page-about .about-milestone-figure figcaption,
.page-about .about-stats-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink-dim);
}

.page-about .about-stats-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
.page-about .about-stats-desc {
  margin: 0 0 18px;
}
.page-about .about-stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin: 20px 0 22px;
}
.page-about .about-stat-grid .stat-item {
  display: grid;
  align-content: space-between;
  min-height: 118px;
  padding: 18px 16px;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.page-about .about-stat-grid .stat-item:hover {
  border-color: var(--line-strong);
  transform: translateY(-3px);
}
.page-about .about-stat-grid .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 4vw, 34px);
  font-weight: 500;
  line-height: 1;
  color: var(--green);
}
.page-about .about-stat-grid .stat-label {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  color: var(--ink-dim);
}
.page-about .about-stats-note {
  margin: 20px 0 0;
  padding: 16px 18px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-dim);
  background: rgba(61, 220, 106, .06);
  border-left: 3px solid var(--green);
}

.page-about .about-tech {
  background:
    linear-gradient(135deg, transparent 0%, transparent calc(100% - 160px), rgba(255, 122, 26, .06) calc(100% - 160px) 100%);
}
.page-about .about-tech-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 26px;
}
.page-about .about-tech-card {
  position: relative;
  padding: 26px 22px 22px;
  background: linear-gradient(160deg, var(--bg-panel), var(--bg-main));
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.page-about .about-tech-card::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--green), transparent);
  opacity: .35;
  transition: opacity var(--dur) var(--ease);
}
.page-about .about-tech-card:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  box-shadow: 0 16px 34px rgba(0, 11, 18, .35);
}
.page-about .about-tech-card:hover::after {
  opacity: 1;
}
.page-about .about-tech-badge {
  display: inline-block;
  margin-bottom: 16px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--orange);
  background: rgba(255, 122, 26, .1);
  border: 1px solid rgba(255, 122, 26, .35);
  border-radius: 999px;
}
.page-about .about-tech-card h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}
.page-about .about-tech-card p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-dim);
}

.page-about .about-community {
  border-bottom: 0;
}
.page-about .about-community-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 26px;
}
.page-about .about-community-item {
  padding: 24px 22px;
  background: linear-gradient(150deg, var(--bg-panel), rgba(13, 43, 62, .55));
  border-left: 3px solid var(--green);
}
.page-about .about-community-item h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}
.page-about .about-community-item p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-dim);
}
.page-about .about-community-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}
.page-about .about-community-links a {
  padding: 10px 18px;
  font-size: 13px;
  color: var(--ink);
  text-decoration: none;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .about-community-links a:hover {
  color: var(--bg-main);
  background: var(--green);
  border-color: var(--green);
}

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

@media (min-width: 720px) {
  .page-about .about-section {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(20px, 3vw, 48px);
  }
  .page-about .about-section-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
    flex-direction: column;
    align-items: flex-end;
    justify-content: stretch;
    gap: 10px;
  }
  .page-about .about-rail-next {
    margin-left: 0;
    margin-top: auto;
  }
  .page-about .about-stat-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .about-stats-layout {
    grid-template-columns: minmax(0, 1.08fr) minmax(280px, .92fr);
    align-items: center;
    gap: clamp(24px, 4vw, 56px);
  }
  .page-about .about-stats-figure {
    margin: 0;
  }
  .page-about .about-tech-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .about-community-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    min-height: 620px;
  }
  .page-about .about-origin .about-section-body {
    margin-right: clamp(0px, 7vw, 120px);
  }
  .page-about .about-milestone .about-section-body {
    margin-left: var(--about-offset);
  }
  .page-about .about-tech .about-section-body {
    margin-left: clamp(0px, 6vw, 96px);
  }
  .page-about .about-community .about-section-body {
    margin-right: clamp(0px, 5vw, 80px);
  }
}

@media (min-width: 1020px) {
  .page-about .about-milestone .about-section-body {
    display: grid;
    grid-template-columns: minmax(0, 1.06fr) minmax(280px, .94fr);
    column-gap: clamp(28px, 4vw, 60px);
  }
  .page-about .about-milestone .about-section-title,
  .page-about .about-milestone .about-section-lead {
    grid-column: 1 / -1;
  }
  .page-about .about-milestone .about-timeline {
    grid-column: 1;
    margin-bottom: 0;
  }
  .page-about .about-milestone-figure {
    grid-column: 2;
    align-self: start;
    margin-top: 8px;
  }
  .page-about .about-stats .about-section-body {
    max-width: 960px;
  }
}