.page-about {
  --about-grid-color: rgba(42, 59, 90, 0.32);
  --about-panel-bg: rgba(20, 42, 82, 0.7);
  --about-panel-bg-strong: rgba(20, 42, 82, 0.85);
  position: relative;
  background-color: var(--bs-bg);
  background-image:
    linear-gradient(var(--about-grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid-color) 1px, transparent 1px);
  background-size: 44px 44px;
  color: var(--bs-text);
  overflow-x: hidden;
}

.page-about .about-hero {
  padding-top: 44px;
  padding-bottom: 28px;
}

.page-about .about-hero__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
}

.page-about .about-hero__coords {
  display: flex;
  gap: 12px;
  font-family: var(--bs-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--bs-text-2);
}

.page-about .about-hero__inner {
  max-width: 760px;
}

.page-about .about-hero__mark {
  display: block;
  width: 44px;
  height: 44px;
  margin-bottom: 28px;
  background: var(--bs-accent);
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
  box-shadow: 0 0 24px rgba(200, 255, 0, 0.35);
}

.page-about .about-hero__title {
  margin: 10px 0 20px;
  font-size: clamp(52px, 11vw, 96px);
  font-weight: 200;
  line-height: 1.02;
  letter-spacing: -0.04em;
  color: var(--bs-text);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 46em;
  font-size: 17px;
  line-height: 1.75;
  color: var(--bs-text-2);
}

.page-about .about-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.page-about .about-index {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  padding-top: 8px;
  padding-bottom: 8px;
  margin-bottom: 28px;
}

.page-about .about-index__item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 15px 16px;
  background: var(--about-panel-bg);
  border: 1px solid var(--bs-border);
  border-radius: 12px;
  color: var(--bs-text);
  text-decoration: none;
  font-size: 14px;
  transition:
    border-color 0.2s ease,
    background-color 0.2s ease;
}

.page-about .about-index__item:hover {
  border-color: var(--bs-accent);
  background-color: var(--about-panel-bg-strong);
}

.page-about .about-index__num {
  font-family: var(--bs-mono);
  font-size: 12px;
  color: var(--bs-accent);
  letter-spacing: 0.06em;
}

.page-about .about-section-title {
  margin: 10px 0 16px;
  font-size: clamp(28px, 5vw, 46px);
  font-weight: 200;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--bs-text);
}

.page-about .about-intro__grid {
  display: grid;
  gap: 32px;
  align-items: start;
}

.page-about .about-intro__text {
  margin: 0 0 14px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--bs-text-2);
}

.page-about .about-intro__list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-intro__list li {
  padding: 6px 13px;
  border: 1px solid var(--bs-border);
  border-radius: 999px;
  background: rgba(200, 255, 0, 0.06);
  color: var(--bs-accent);
  font-family: var(--bs-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .about-intro__figure {
  margin: 0;
}

.page-about .about-intro__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--bs-radius);
  background: var(--bs-bg-2);
}

.page-about .about-intro__figure figcaption {
  margin-top: 10px;
  font-family: var(--bs-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--bs-text-2);
}

.page-about .about-timeline-section {
  position: relative;
}

.page-about .about-timeline__header {
  max-width: 640px;
  margin-bottom: 40px;
}

.page-about .about-timeline__intro {
  margin: 0;
  font-size: 16px;
  color: var(--bs-text-2);
}

.page-about .about-timeline {
  position: relative;
  padding-left: 48px;
}

.page-about .about-timeline__line {
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(
    to bottom,
    var(--bs-accent) 0%,
    rgba(200, 255, 0, 0.4) 24%,
    var(--bs-border) 80%
  );
}

.page-about .about-timeline__item {
  position: relative;
  margin-bottom: 28px;
}

.page-about .about-timeline__dot {
  position: absolute;
  left: 6px;
  top: 28px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--bs-accent);
  box-shadow:
    0 0 0 5px rgba(200, 255, 0, 0.15),
    0 0 18px rgba(200, 255, 0, 0.4);
  z-index: 1;
}

.page-about .about-timeline__card {
  background: var(--about-panel-bg);
  border: 1px solid var(--bs-border);
  border-radius: 16px;
  padding: 18px 20px;
  color: var(--bs-text);
  transition:
    border-color 0.25s ease,
    background-color 0.25s ease;
}

.page-about .about-timeline__card summary {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-timeline__card summary::after {
  content: '+';
  margin-left: auto;
  font-family: var(--bs-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--bs-accent);
}

.page-about .about-timeline__card[open] summary::after {
  content: '−';
}

.page-about .about-timeline__card[open] {
  background: var(--about-panel-bg-strong);
  border-color: rgba(200, 255, 0, 0.35);
}

.page-about .about-timeline__year {
  font-family: var(--bs-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--bs-accent);
  white-space: nowrap;
}

.page-about .about-timeline__label {
  font-size: 16px;
  font-weight: 600;
  color: var(--bs-text);
}

.page-about .about-timeline__detail {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--bs-border);
  color: var(--bs-text-2);
  font-size: 15px;
  line-height: 1.65;
}

.page-about .about-timeline__detail p {
  margin: 0;
}

.page-about .about-timeline__item--media {
  margin: 32px 0 32px;
}

.page-about .about-timeline__media img {
  display: block;
  width: 100%;
  max-width: 420px;
  height: auto;
  border-radius: 16px;
  background: var(--bs-bg-2);
}

.page-about .about-philosophy {
  background: var(--bs-bg-2);
}

.page-about .about-philosophy__inner {
  max-width: 900px;
}

.page-about .about-philosophy__grid {
  display: grid;
  gap: 20px;
  margin-top: 36px;
}

.page-about .about-philosophy__card {
  position: relative;
  padding: 28px 24px;
  background: rgba(11, 27, 58, 0.8);
  border: 1px solid var(--bs-border);
  border-radius: var(--bs-radius);
}

.page-about .about-philosophy__num {
  display: block;
  margin-bottom: 14px;
  font-family: var(--bs-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--bs-accent);
}

.page-about .about-philosophy__card h3 {
  margin: 0 0 10px;
  font-size: 20px;
  font-weight: 600;
  color: var(--bs-text);
}

.page-about .about-philosophy__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--bs-text-2);
}

.page-about .about-philosophy__card:nth-child(2) {
  background: var(--bs-paper);
  border-color: transparent;
  color: var(--bs-bg);
}

.page-about .about-philosophy__card:nth-child(2) .about-philosophy__num {
  color: var(--bs-accent-2);
}

.page-about .about-philosophy__card:nth-child(2) h3 {
  color: var(--bs-bg);
}

.page-about .about-philosophy__card:nth-child(2) p {
  color: rgba(11, 27, 58, 0.75);
}

.page-about .about-scale__header {
  max-width: 620px;
  margin-bottom: 40px;
}

.page-about .about-scale__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--bs-border);
  border: 1px solid var(--bs-border);
  border-radius: var(--bs-radius);
  overflow: hidden;
}

.page-about .about-scale__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 30px 18px 26px;
  background: var(--bs-bg);
}

.page-about .about-scale__num {
  font-family: var(--bs-mono);
  font-size: clamp(40px, 7vw, 68px);
  font-weight: 400;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--bs-accent);
  text-shadow: 0 0 24px rgba(200, 255, 0, 0.18);
}

.page-about .about-scale__label {
  font-size: 14px;
  color: var(--bs-text-2);
  letter-spacing: 0.04em;
}

.page-about .about-quality {
  background: var(--bs-bg-2);
}

.page-about .about-quality__grid {
  display: grid;
  gap: 36px;
  align-items: center;
}

.page-about .about-quality__figure {
  margin: 0;
}

.page-about .about-quality__figure img {
  display: block;
  width: 100%;
  max-width: 360px;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  margin: 0 auto;
  border-radius: var(--bs-radius);
  background: var(--bs-bg);
}

.page-about .about-quality__text {
  margin: 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--bs-text-2);
}

.page-about .about-quality__list {
  display: grid;
  gap: 12px;
  margin: 22px 0 28px;
  padding: 0;
  list-style: none;
}

.page-about .about-quality__list li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 15px;
  color: var(--bs-text-2);
}

.page-about .about-quality__list li::before {
  content: '◆';
  font-size: 10px;
  color: var(--bs-success);
}

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

.page-about .about-cta__inner {
  padding: 48px 24px;
  background: var(--bs-paper);
  border-radius: calc(var(--bs-radius) + 8px);
  text-align: center;
  color: var(--bs-bg);
}

.page-about .about-cta__inner .bs-display {
  margin: 0 0 10px;
  color: var(--bs-bg);
}

.page-about .about-cta__text {
  margin: 0 0 24px;
  font-size: 16px;
  color: rgba(11, 27, 58, 0.7);
}

.page-about .about-cta__links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
}

@media (min-width: 640px) {
  .page-about .about-index {
    grid-template-columns: repeat(5, 1fr);
  }

  .page-about .about-scale__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 860px) {
  .page-about .about-hero {
    padding-top: 64px;
  }

  .page-about .about-intro__grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 56px;
  }

  .page-about .about-timeline {
    padding-left: 64px;
  }

  .page-about .about-timeline__line {
    left: 19px;
  }

  .page-about .about-timeline__dot {
    left: 10px;
    top: 30px;
  }

  .page-about .about-timeline__card {
    max-width: 620px;
  }

  .page-about .about-timeline__media img {
    max-width: 520px;
  }

  .page-about .about-philosophy__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .page-about .about-philosophy__card:nth-child(2) {
    transform: translateY(24px);
  }

  .page-about .about-quality__grid {
    grid-template-columns: 0.8fr 1.2fr;
    gap: 56px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__inner {
    padding-left: 48px;
  }

  .page-about .about-section-title {
    font-size: 48px;
  }

  .page-about .about-timeline-section {
    margin-top: 8px;
  }
}