.page-about {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.7;
  overflow-x: clip;
}

/* ===== Hero ===== */
.page-about .about-hero {
  position: relative;
  background: var(--ink);
  color: var(--paper);
  padding: calc(var(--header-h) + 56px) 0 104px;
  overflow: hidden;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 40px;
  opacity: 0.78;
}

.page-about .about-hero .breadcrumb a {
  color: inherit;
}

.page-about .about-hero .breadcrumb__item [aria-current="page"] {
  color: var(--orange);
}

.page-about .about-hero .mono-tag {
  color: var(--orange);
  margin-bottom: 16px;
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(40px, 8vw, 72px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  max-width: 880px;
  margin: 0 0 24px;
}

.page-about .about-hero__lead {
  font-size: clamp(17px, 2.4vw, 21px);
  line-height: 1.75;
  max-width: 680px;
  color: rgba(245, 239, 226, 0.86);
  margin: 0;
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid rgba(245, 239, 226, 0.2);
}

.page-about .hero-stat {
  display: flex;
  flex-direction: column-reverse;
}

.page-about .hero-stat dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(245, 239, 226, 0.6);
}

.page-about .hero-stat dd {
  font-family: var(--font-head);
  font-size: 30px;
  font-weight: 900;
  margin: 0 0 4px;
  color: var(--white);
}

.page-about .about-hero__peaks {
  position: absolute;
  left: -5%;
  bottom: -2px;
  width: 110%;
  height: 180px;
  background: linear-gradient(135deg, rgba(45, 108, 223, 0.55), rgba(240, 123, 63, 0.3));
  clip-path: polygon(0% 100%, 0% 58%, 10% 58%, 18% 30%, 26% 58%, 36% 18%, 46% 58%, 54% 36%, 64% 58%, 74% 24%, 86% 58%, 100% 46%, 100% 100%);
  opacity: 0.5;
  pointer-events: none;
}

/* ===== Layout & Index ===== */
.page-about .about-layout {
  display: block;
  padding-top: 0;
}

.page-about .about-index {
  position: sticky;
  top: var(--header-h);
  z-index: 30;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  margin: 0 calc(var(--gutter) * -1);
  padding: 0 var(--gutter);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__list {
  list-style: none;
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 8px 0;
}

.page-about .about-index__item {
  flex: 0 0 auto;
  margin: 0;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--gray);
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid transparent;
}

.page-about .about-index__link:hover {
  color: var(--blue);
  background: var(--light-blue);
}

.page-about .about-index__num {
  color: var(--orange);
}

.page-about:has(#origin:target) .about-index__link[href="#origin"],
.page-about:has(#timeline:target) .about-index__link[href="#timeline"],
.page-about:has(#philosophy:target) .about-index__link[href="#philosophy"],
.page-about:has(#team:target) .about-index__link[href="#team"] {
  color: var(--blue);
  background: var(--light-blue);
  border-left-color: var(--orange);
  font-weight: 700;
}

/* ===== Section base ===== */
.page-about .about-content {
  min-width: 0;
}

.page-about .about-section {
  position: relative;
  padding: 56px 0;
  scroll-margin-top: calc(var(--header-h) + 20px);
}

.page-about .about-section::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(105deg, var(--orange) 0%, var(--orange) 24%, var(--border) 24%, var(--border) 100%);
  transform: rotate(0.3deg);
  pointer-events: none;
}

.page-about .about-section--philosophy::after,
.page-about .about-section--team::after {
  display: none;
}

.page-about .about-section > *:not(.timeline__svg):not(.about-section__watermark) {
  position: relative;
  z-index: 1;
}

.page-about .timeline__svg,
.page-about .about-section__watermark {
  position: absolute;
  z-index: 0;
  pointer-events: none;
}

.page-about .about-section__head {
  max-width: 720px;
}

.page-about .about-section__head .mono-tag {
  margin-bottom: 10px;
}

.page-about .about-section__title {
  font-family: var(--font-head);
  font-size: clamp(26px, 5vw, 36px);
  font-weight: 900;
  line-height: 1.25;
  margin: 0 0 12px;
}

.page-about .about-section__intro {
  color: var(--gray);
  margin: 0;
}

/* ===== Origin ===== */
.page-about .about-section--origin::before {
  content: "01";
  position: absolute;
  right: 3%;
  top: 20px;
  font-family: var(--font-mono);
  font-size: clamp(80px, 16vw, 160px);
  font-weight: 700;
  line-height: 1;
  color: var(--blue);
  opacity: 0.06;
  pointer-events: none;
}

.page-about .about-section__inner--split {
  display: grid;
  gap: 32px;
  align-items: center;
}

.page-about .about-section__textcol p + p {
  margin-top: 16px;
}

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

.page-about .about-section__imgcol img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: 0 18px 40px rgba(30, 42, 54, 0.12);
  transform: rotate(-1.2deg);
}

/* ===== Timeline ===== */
.page-about .about-section--timeline {
  background: var(--light-blue);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-top: 24px;
  margin-bottom: 24px;
  padding: 48px 20px 56px;
}

.page-about .about-section--timeline::after {
  bottom: 8px;
  left: 8px;
  right: 8px;
}

.page-about .timeline__grid {
  display: grid;
  gap: 40px;
  margin-top: 40px;
}

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

.page-about .timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 20px 1fr;
  gap: 16px;
  padding-bottom: 28px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 20px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(to bottom, var(--blue), var(--orange));
  opacity: 0.35;
}

.page-about .timeline__item:last-child::before {
  display: none;
}

.page-about .timeline__dot {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--white);
  border: 4px solid var(--blue);
  box-shadow: 0 0 0 4px var(--light-blue);
  position: relative;
  z-index: 2;
}

.page-about .timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--blue);
  margin-bottom: 4px;
}

.page-about .timeline__detail summary {
  list-style: none;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 18px;
  color: var(--ink);
  cursor: pointer;
  padding: 0;
}

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

.page-about .timeline__detail summary::marker {
  content: "";
}

.page-about .timeline__detail summary::before {
  content: "+";
  display: inline-block;
  width: 22px;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--orange);
}

.page-about .timeline__detail[open] summary::before {
  content: "–";
}

.page-about .timeline__detail p {
  margin: 8px 0 0 28px;
  font-size: 15px;
  line-height: 1.65;
  color: var(--gray);
}

.page-about .timeline__figure {
  margin: 0;
  align-self: center;
}

.page-about .timeline__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: 0 18px 40px rgba(30, 42, 54, 0.12);
}

.page-about .timeline__svg {
  left: -40px;
  top: 0;
  width: 200px;
  height: 100%;
  opacity: 0.22;
}

.page-about .timeline__svg path {
  stroke: var(--blue);
  stroke-width: 2;
  stroke-dasharray: 4 8;
}

/* ===== Philosophy ===== */
.page-about .about-section--philosophy::before {
  content: "03";
  position: absolute;
  right: 3%;
  top: 20px;
  font-family: var(--font-mono);
  font-size: clamp(80px, 16vw, 160px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
  opacity: 0.06;
  pointer-events: none;
}

.page-about .philosophy__grid {
  display: grid;
  gap: 20px;
  margin-top: 40px;
}

.page-about .feature-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  box-shadow: 0 12px 28px rgba(30, 42, 54, 0.06);
}

.page-about .feature-card__num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--orange);
}

.page-about .feature-card__title {
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 900;
  margin: 14px 0 10px;
}

.page-about .feature-card__text {
  font-size: 15px;
  line-height: 1.7;
  margin: 0;
}

.page-about .philosophy__note {
  margin-top: 28px;
  max-width: 560px;
  margin-left: auto;
  margin-right: 0;
}

/* ===== Team ===== */
.page-about .about-section--team {
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-top: 24px;
  margin-bottom: 24px;
  padding: 56px 20px;
}

.page-about .about-section--team::before {
  content: "04";
  position: absolute;
  right: 3%;
  top: 18px;
  font-family: var(--font-mono);
  font-size: clamp(80px, 16vw, 160px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
  opacity: 0.07;
  pointer-events: none;
}

.page-about .about-section--team .about-section__title {
  color: var(--white);
}

.page-about .about-section--team .about-section__intro {
  color: rgba(245, 239, 226, 0.7);
}

.page-about .team__grid {
  display: grid;
  gap: 36px;
  margin-top: 40px;
}

.page-about .team__text p {
  margin: 0 0 16px;
}

.page-about .team__text p:last-child {
  margin-bottom: 0;
}

.page-about .team__contact a {
  color: var(--orange);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page-about .stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  align-self: start;
}

.page-about .stat-card {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md);
  padding: 20px;
}

.page-about .stat-card__num {
  display: block;
  font-family: var(--font-head);
  font-size: 30px;
  font-weight: 900;
  line-height: 1.1;
  color: var(--white);
}

.page-about .stat-card__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: rgba(245, 239, 226, 0.72);
}

.page-about .stat-card__bar {
  display: block;
  height: 4px;
  margin-top: 12px;
  background: rgba(255, 255, 255, 0.12);
  border-radius: 2px;
  overflow: hidden;
}

.page-about .stat-card__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--blue), var(--orange));
  border-radius: 2px;
  transform-origin: left;
}

.page-about .stat-card__fill--team {
  width: 72%;
}

.page-about .stat-card__fill--engineer {
  width: 60%;
}

.page-about .stat-card__fill--check {
  width: 88%;
}

.page-about .stat-card__fill--copyright {
  width: 46%;
}

@keyframes about-stat-grow {
  from {
    transform: scaleX(0.05);
  }
  to {
    transform: scaleX(1);
  }
}

.page-about .stat-card__fill {
  animation: about-stat-grow 1s var(--ease) both;
  animation-timeline: view();
  animation-range: entry 15% cover 35%;
}

.page-about .qualifications {
  display: grid;
  gap: 12px;
  margin-top: 40px;
}

.page-about .qualification-item {
  display: flex;
  gap: 12px;
  align-items: baseline;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
}

.page-about .qualification-item__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--orange);
  flex: 0 0 auto;
}

.page-about .qualification-item__text {
  font-size: 15px;
  line-height: 1.5;
}

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

.page-about .team__figure img {
  display: block;
  width: 100%;
  height: 420px;
  object-fit: cover;
  border-radius: var(--radius-md);
  box-shadow: 0 20px 44px rgba(0, 0, 0, 0.25);
}

.page-about .about-section__watermark {
  right: -40px;
  bottom: 20px;
  width: 280px;
  height: 168px;
  color: var(--paper);
  opacity: 0.05;
}

/* ===== CTA ===== */
.page-about .about-cta {
  padding: 72px 0 96px;
}

.page-about .about-cta__card {
  position: relative;
  max-width: 760px;
  margin: 0 auto;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 48px 32px;
  text-align: center;
  box-shadow: 0 24px 56px rgba(30, 42, 54, 0.1);
  overflow: hidden;
}

.page-about .about-cta__card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--blue), var(--orange));
}

.page-about .about-cta .mono-tag {
  color: var(--orange);
}

.page-about .about-cta__title {
  font-family: var(--font-head);
  font-size: clamp(24px, 4vw, 32px);
  font-weight: 900;
  line-height: 1.3;
  margin: 12px 0 16px;
}

.page-about .about-cta__card p:not(.mono-tag) {
  color: var(--gray);
  margin: 0 0 28px;
}

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

/* ===== Desktop ===== */
@media (min-width: 800px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
    padding-top: 56px;
    padding-bottom: 40px;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    background: transparent;
    border: none;
    margin: 0;
    padding: 0;
    overflow: visible;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 2px;
    padding: 0;
    border-left: 1px solid var(--border);
  }

  .page-about .about-index__item {
    flex: none;
  }

  .page-about .about-index__link {
    width: 100%;
    border-radius: 0;
    border-left: 3px solid transparent;
    padding: 10px 14px;
    white-space: normal;
  }

  .page-about .about-index__link:hover {
    background: transparent;
  }

  .page-about .about-section__inner--split {
    grid-template-columns: 1.05fr 1fr;
    gap: 56px;
  }

  .page-about .about-section--timeline,
  .page-about .about-section--team {
    padding-left: 40px;
    padding-right: 40px;
  }

  .page-about .timeline__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: 56px;
    align-items: start;
  }

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

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

  .page-about .qualifications {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .page-about .about-cta {
    padding: 80px 0 96px;
  }

  .page-about .about-cta__card {
    padding: 56px 56px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .page-about .about-hero__peaks,
  .page-about .about-section__imgcol img {
    transform: none !important;
  }
}