.page-about {
  --about-pad: clamp(3rem, 7vw, 5.5rem);
  --about-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
  --about-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --about-sky: #9CC7E8;
  color: var(--text-dark);
  overflow-x: hidden;
}

.page-about .container {
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: 24px;
}

.page-about .breadcrumb {
  margin-bottom: 2.5rem;
}

.page-about .breadcrumb ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.page-about .breadcrumb li {
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--gray);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 0.5rem;
  color: var(--gray);
  opacity: 0.55;
}

.page-about .breadcrumb a {
  color: var(--blue);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  text-decoration: underline;
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--gray);
}

.page-about .kicker {
  font-family: var(--about-serif);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  margin: 0 0 0.75rem;
}

.page-about .about-hero {
  position: relative;
  background: var(--cream);
  padding: clamp(2.5rem, 6vw, 4.5rem) 0 0;
  overflow: hidden;
}

.page-about .about-hero-glow {
  position: absolute;
  right: -60px;
  top: -60px;
  width: 260px;
  height: 260px;
  background: radial-gradient(circle at 100% 0, rgba(229, 163, 59, 0.18), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero-kicker {
  font-family: var(--about-serif);
  font-size: 0.9375rem;
  letter-spacing: 0.16em;
  color: var(--terra);
  margin: 0 0 1rem;
}

.page-about .about-hero h1 {
  font-family: var(--about-sans);
  font-weight: 900;
  font-size: clamp(2rem, 5.2vw, 3.6rem);
  line-height: 1.22;
  color: var(--blue);
  margin: 0 0 1.4rem;
  max-width: 940px;
}

.page-about .about-hero-lead {
  font-size: clamp(1rem, 1.6vw, 1.1875rem);
  line-height: 1.9;
  color: var(--text-dark);
  max-width: 640px;
  margin: 0 0 2.75rem;
}

.page-about .about-hero-fig {
  margin: 0;
  background: #fff;
  border: 1px solid var(--line);
  border-bottom: none;
  border-radius: var(--radius) var(--radius) 0 0;
  padding: 0.75rem 0.75rem 0;
}

.page-about .about-hero-fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border-radius: calc(var(--radius) - 2px);
}

.page-about .about-hero-fig figcaption {
  padding: 0.8rem 0.5rem;
  font-family: var(--about-serif);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--gray);
}

.page-about .about-origin {
  background: var(--snow);
  padding: var(--about-pad) 0;
}

.page-about .about-origin-grid {
  display: grid;
  gap: 2.5rem;
}

.page-about .about-origin-head .kicker {
  color: var(--blue);
}

.page-about .about-origin-head h2 {
  font-family: var(--about-sans);
  font-weight: 900;
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  line-height: 1.3;
  color: var(--blue);
  margin: 0 0 1.25rem;
}

.page-about .about-origin-note {
  font-family: var(--about-serif);
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--terra);
  border-left: 3px solid var(--yellow);
  padding-left: 1.125rem;
  margin: 0;
}

.page-about .about-origin-body p {
  line-height: 1.9;
  color: var(--text-dark);
  margin: 0 0 1.25rem;
}

.page-about .about-origin-body strong {
  color: var(--blue);
  font-weight: 700;
}

.page-about .about-origin-list {
  list-style: none;
  padding: 0;
  margin: 2rem 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-origin-list li {
  display: flex;
  gap: 1rem;
  align-items: baseline;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.page-about .about-list-marker {
  flex: 0 0 2rem;
  font-family: var(--about-serif);
  font-weight: 700;
  font-size: 0.8125rem;
  color: var(--red);
}

.page-about .about-origin-quote {
  margin: 2rem 0 0;
  background: var(--cream);
  border-left: 4px solid var(--terra);
  padding: 1.25rem 1.5rem;
  font-family: var(--about-serif);
  line-height: 1.8;
  color: var(--text-dark);
}

.page-about .about-milestones {
  position: relative;
  background: #fff;
  padding: var(--about-pad) 0;
  overflow: hidden;
}

.page-about .about-mountain-bg {
  position: absolute;
  top: -30px;
  left: 0;
  width: 100%;
  height: 280px;
  z-index: 0;
  pointer-events: none;
}

.page-about .about-milestones .container {
  position: relative;
  z-index: 1;
}

.page-about .about-milestones-head {
  max-width: 720px;
  margin: 0 auto 3.5rem;
  text-align: center;
}

.page-about .about-milestone-symbol {
  display: block;
  width: 64px;
  height: 64px;
  object-fit: contain;
  margin: 0 auto 1rem;
}

.page-about .about-milestones-head .kicker {
  color: var(--green);
}

.page-about .about-milestones-head h2 {
  font-family: var(--about-sans);
  font-weight: 900;
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  line-height: 1.3;
  color: var(--blue);
  margin: 0 0 1rem;
}

.page-about .about-milestones-desc {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--gray);
  margin: 0;
}

.page-about .about-timeline {
  position: relative;
  max-width: 880px;
  margin-inline: auto;
  padding-left: 40px;
}

.page-about .about-timeline-line {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 13px;
  border-left: 2px dashed rgba(27, 90, 141, 0.3);
}

.page-about .about-ms {
  position: relative;
  margin-bottom: 1.75rem;
}

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

.page-about .about-ms-dot {
  position: absolute;
  top: 10px;
  left: 6px;
  width: 14px;
  height: 14px;
  background: var(--blue);
  border: 2px solid #fff;
  border-radius: 3px;
  transform: rotate(45deg);
  box-shadow: 0 0 0 1px rgba(27, 90, 141, 0.35);
  z-index: 1;
}

.page-about .about-ms-details {
  background: var(--snow);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.15rem 1.35rem;
  transition: box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .about-ms-details[open] {
  border-color: rgba(27, 90, 141, 0.25);
  box-shadow: 0 14px 36px rgba(20, 60, 92, 0.08);
}

.page-about .about-ms-details summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  outline: none;
}

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

.page-about .about-ms-details summary:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 4px;
  border-radius: 4px;
}

.page-about .about-ms-date {
  font-family: var(--about-serif);
  font-weight: 700;
  font-size: 1.875rem;
  line-height: 1.1;
  color: var(--blue);
  flex-shrink: 0;
  min-width: 3.4rem;
}

.page-about .about-ms-text {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  min-width: 0;
}

.page-about .about-ms-tag {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--red);
  text-transform: uppercase;
}

.page-about .about-ms-title {
  font-family: var(--about-sans);
  font-weight: 700;
  font-size: 1.0625rem;
  line-height: 1.5;
  color: var(--text-dark);
}

.page-about .about-ms-details[open] .about-ms-title {
  color: var(--blue);
}

.page-about .about-ms-details summary::after {
  content: "+";
  margin-left: auto;
  font-size: 1.375rem;
  font-weight: 400;
  line-height: 1;
  color: var(--red);
  padding-top: 0.2rem;
}

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

.page-about .about-ms-body {
  padding-top: 0.85rem;
  margin-top: 0.85rem;
  border-top: 1px solid var(--line);
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--gray);
}

.page-about .about-ms-body p {
  margin: 0;
}

.page-about .about-scale {
  background: linear-gradient(180deg, var(--cream) 0%, var(--snow) 100%);
  padding: var(--about-pad) 0;
}

.page-about .about-scale-grid {
  display: grid;
  gap: 2.5rem;
}

.page-about .about-scale-main .kicker {
  color: var(--blue);
}

.page-about .about-scale-main h2 {
  font-family: var(--about-sans);
  font-weight: 900;
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  line-height: 1.3;
  color: var(--blue);
  margin: 0 0 1rem;
}

.page-about .about-scale-desc {
  max-width: 560px;
  line-height: 1.85;
  color: var(--text-dark);
  margin: 0 0 2rem;
}

.page-about .about-scale-fig {
  margin: 0 0 2rem;
  background: var(--cream);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-scale-fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-scale-fig figcaption {
  padding: 0.75rem 1rem;
  font-family: var(--about-serif);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--gray);
}

.page-about .about-scale-table-wrap {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.page-about .about-scale-table-wrap h3 {
  font-family: var(--about-sans);
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--blue);
  margin: 0;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--line);
}

.page-about .about-scale-table {
  list-style: none;
  margin: 0.85rem 0 0;
  padding: 0;
}

.page-about .about-scale-table li {
  display: flex;
  justify-content: space-between;
  gap: 1.25rem;
  padding: 0.85rem 0.1rem;
  border-bottom: 1px solid var(--line);
  font-size: 0.9375rem;
  line-height: 1.65;
}

.page-about .about-scale-table li:last-child {
  border-bottom: none;
}

.page-about .about-scale-label {
  color: var(--gray);
  flex-shrink: 0;
}

.page-about .about-scale-num {
  color: var(--text-dark);
  font-weight: 700;
  text-align: right;
}

.page-about .about-scale-aside {
  min-width: 0;
}

.page-about .about-aside-sticky {
  position: relative;
  top: 0;
  background: var(--blue-dark);
  color: var(--snow);
  border-radius: calc(var(--radius) + 4px);
  padding: 1.75rem;
  display: grid;
  gap: 1rem;
}

.page-about .about-aside-head h3 {
  font-family: var(--about-sans);
  font-weight: 900;
  font-size: 1.25rem;
  margin: 0;
}

.page-about .about-aside-head p {
  margin: 0.3rem 0 0;
  font-size: 0.8125rem;
  color: rgba(244, 246, 248, 0.7);
}

.page-about .about-stat {
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.page-about .about-stat--blue {
  background: rgba(27, 90, 141, 0.42);
}

.page-about .about-stat--moss {
  background: rgba(94, 125, 91, 0.36);
}

.page-about .about-stat--terra {
  background: rgba(166, 93, 74, 0.36);
}

.page-about .about-stat--cream {
  background: rgba(243, 236, 224, 0.16);
}

.page-about .about-stat-num {
  font-family: var(--about-serif);
  font-weight: 700;
  font-size: 2.1rem;
  line-height: 1.15;
}

.page-about .about-stat-label {
  font-size: 0.8125rem;
  line-height: 1.45;
  color: var(--snow);
  opacity: 0.8;
}

.page-about .about-aside-note {
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--snow);
  opacity: 0.72;
  margin: 0;
}

.page-about .about-commitment {
  background: var(--blue-dark);
  color: var(--snow);
  padding: var(--about-pad) 0;
}

.page-about .about-commitment-head {
  max-width: 640px;
  margin-bottom: 3rem;
}

.page-about .about-commitment-head .kicker {
  color: var(--yellow);
}

.page-about .about-commitment-head h2 {
  font-family: var(--about-sans);
  font-weight: 900;
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  line-height: 1.3;
  color: #fff;
  margin: 0 0 1rem;
}

.page-about .about-commitment-head p {
  color: rgba(244, 246, 248, 0.85);
  line-height: 1.8;
  margin: 0;
}

.page-about .about-commitment-grid {
  display: grid;
  gap: 1.25rem;
}

.page-about .about-commit-card {
  background: rgba(244, 246, 248, 0.07);
  border: 1px solid rgba(244, 246, 248, 0.14);
  border-top: 4px solid currentColor;
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: transform 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .about-commit-card:nth-child(1) {
  color: var(--yellow);
}

.page-about .about-commit-card:nth-child(2) {
  color: var(--green);
}

.page-about .about-commit-card:nth-child(3) {
  color: var(--about-sky);
}

.page-about .about-commit-card:nth-child(4) {
  color: var(--terra);
}

.page-about .about-commit-card:nth-child(5) {
  color: var(--moss);
}

.page-about .about-commit-card:nth-child(6) {
  color: var(--red);
}

.page-about .about-commit-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  padding: 0.3rem 0.8rem;
  border: 1px solid currentColor;
  border-radius: 999px;
  margin-bottom: 1rem;
}

.page-about .about-commit-card h3 {
  font-family: var(--about-sans);
  font-weight: 700;
  font-size: 1.0625rem;
  color: #fff;
  margin: 0 0 0.55rem;
}

.page-about .about-commit-card p {
  color: rgba(244, 246, 248, 0.8);
  font-size: 0.875rem;
  line-height: 1.75;
  margin: 0;
}

.page-about .about-epilogue {
  position: relative;
  background: var(--cream);
  padding: var(--about-pad) 0;
  text-align: center;
}

.page-about .about-epilogue-stripe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--red) 0 25%, var(--yellow) 0 50%, var(--green) 0 75%, var(--blue) 0 100%);
}

.page-about .about-epilogue-quote {
  font-family: var(--about-serif);
  font-weight: 700;
  font-size: clamp(1.4rem, 2.8vw, 2.2rem);
  line-height: 1.55;
  color: var(--blue);
  margin: 0 auto 1.5rem;
  max-width: 680px;
}

.page-about .about-epilogue-text {
  max-width: 560px;
  margin: 0 auto 2.5rem;
  line-height: 1.9;
  color: var(--text-dark);
}

.page-about .about-epilogue-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}

.js .page-about [data-visible] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.js .page-about [data-visible].is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 767px) {
  .page-about .about-origin-list li {
    flex-wrap: wrap;
    gap: 0.35rem;
  }

  .page-about .about-origin-list .about-list-marker {
    flex-basis: 100%;
  }

  .page-about .about-scale-table li {
    flex-direction: column;
    gap: 0.35rem;
  }

  .page-about .about-scale-num {
    text-align: left;
  }

  .page-about .about-commit-card {
    padding: 1.25rem;
  }
}

@media (min-width: 640px) {
  .page-about .about-commitment-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .page-about .about-timeline {
    padding-left: 0;
  }

  .page-about .about-timeline-line {
    left: 50%;
    transform: translateX(-1px);
  }

  .page-about .about-ms {
    width: 50%;
    margin-bottom: 2.5rem;
  }

  .page-about .about-ms--left {
    margin-right: auto;
    padding-right: 3rem;
  }

  .page-about .about-ms--right {
    margin-left: 50%;
    padding-left: 3rem;
  }

  .page-about .about-ms--left .about-ms-dot {
    left: auto;
    right: -7px;
  }

  .page-about .about-ms--right .about-ms-dot {
    right: auto;
    left: -7px;
  }

  .page-about .about-ms-details {
    padding: 1.35rem 1.6rem;
  }
}

@media (min-width: 800px) {
  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 4rem;
  }
}

@media (min-width: 992px) {
  .page-about .about-scale-grid {
    grid-template-columns: minmax(0, 7fr) minmax(300px, 3fr);
    gap: 3.5rem;
    align-items: start;
  }

  .page-about .about-aside-sticky {
    position: sticky;
    top: 96px;
  }
}

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

@media (prefers-reduced-motion: reduce) {
  .js .page-about [data-visible] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .about-ms-details,
  .page-about .about-commit-card {
    transition: none;
  }
}