.page-about {
  --about-cut: 18px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about p {
  margin: 0;
  font-size: 17px;
  line-height: 1.8;
}

.page-about h2,
.page-about h3 {
  margin: 0;
}

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

.page-about .about-wrap {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4vw, 44px) 0 0;
  background: var(--ink);
  color: var(--paper);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(180deg, rgba(147, 166, 186, 0.07) 0 1px, transparent 1px 6px);
  pointer-events: none;
}

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

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(22px, 4vw, 36px);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.page-about .breadcrumb-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--gray-blue);
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  color: var(--orange);
}

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

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--cyan);
}

.page-about .breadcrumb-current {
  color: var(--paper);
}

.page-about .about-eyebrow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  margin-bottom: clamp(16px, 3vw, 26px);
}

.page-about .about-eyebrow-en {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-eyebrow-cn {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gray-blue);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  padding-bottom: clamp(30px, 6vw, 64px);
}

.page-about .about-h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 8.4vw, 82px);
  line-height: 0.98;
  letter-spacing: 0.005em;
  color: var(--paper);
}

.page-about .about-h1 em {
  font-style: normal;
  color: var(--orange);
}

.page-about .about-hero-side {
  display: grid;
  gap: 18px;
  border-left: 2px solid var(--orange);
  padding-left: 18px;
}

.page-about .about-lede {
  max-width: 34rem;
  color: var(--sand);
}

.page-about .about-hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.page-about .about-hero-links a {
  color: var(--paper);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid rgba(61, 224, 200, 0.5);
}

.page-about .about-hero-links a:hover,
.page-about .about-hero-links a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .about-hero-strip {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line);
  background: var(--ink-deep);
}

.page-about .about-strip-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.page-about .about-strip-item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-strip-item:last-child {
  border-bottom: 0;
}

.page-about .about-strip-num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--orange);
  line-height: 1.2;
}

.page-about .about-strip-label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--gray-blue);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  position: relative;
  padding: clamp(52px, 8vw, 104px) 0;
}

.page-about .about-section--paper {
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-section--sand {
  background: var(--sand);
  color: var(--ink);
}

.page-about .about-section--ink {
  background: var(--ink);
  color: var(--sand);
}

.page-about .about-head {
  display: grid;
  gap: 14px;
  align-content: start;
  max-width: 44rem;
}

.page-about .about-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gray-blue);
}

.page-about .about-label::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--orange);
}

.page-about .about-section--ink .about-label::before {
  background: var(--cyan);
}

.page-about .about-h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 5.6vw, 54px);
  line-height: 1.04;
  letter-spacing: 0.008em;
  color: inherit;
}

.page-about .about-sub {
  font-size: 14px;
  color: var(--gray-blue);
}

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 56px);
}

.page-about .about-prose {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-about .about-prose p {
  max-width: 34rem;
}

.page-about .about-prose--ink p {
  color: var(--sand);
}

.page-about .about-prose--tight {
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .about-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--orange-dark);
}

.page-about .about-section--ink .about-link {
  color: var(--cyan);
  border-bottom-color: rgba(61, 224, 200, 0.6);
}

.page-about .about-more {
  margin-top: clamp(24px, 4vw, 36px);
}

/* ---------- 目录结构图 ---------- */
.page-about .about-map-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
  margin-top: clamp(30px, 5vw, 52px);
}

.page-about .about-map {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .about-map-node {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: 18px 18px 16px;
  background: var(--ink);
  color: var(--paper);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
}

.page-about .about-map-node--alt {
  background: var(--ink-2);
}

.page-about .about-map-step {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-map-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 32px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--orange);
}

.page-about .about-map-unit {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  color: var(--sand);
  letter-spacing: 0;
}

.page-about .about-map-desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--gray-blue);
}

.page-about .about-map-more {
  border-top: 1px solid var(--line);
  padding-top: 8px;
}

.page-about .about-map-more summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  min-height: 24px;
}

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

.page-about .about-map-more summary::before {
  content: "+ ";
}

.page-about .about-map-more[open] summary::before {
  content: "− ";
}

.page-about .about-map-more p {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--gray-blue);
}

.page-about .about-map-link {
  display: block;
  width: 2px;
  height: 18px;
  margin: 0 auto;
  background: linear-gradient(180deg, var(--orange), rgba(232, 70, 42, 0));
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-figure-media {
  position: relative;
  overflow: hidden;
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
  background: var(--ink-2);
}

.page-about .about-figure-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(232, 70, 42, 0.16), rgba(14, 27, 44, 0.14));
  pointer-events: none;
}

.page-about .about-figure-media img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure figcaption {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--gray-blue);
}

/* ---------- 维护节奏 ---------- */
.page-about .about-maintain {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-version {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--amber);
  background: rgba(255, 176, 32, 0.1);
  border: 1px solid rgba(255, 176, 32, 0.42);
}

.page-about .about-prose--ink {
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .about-fields {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .about-field {
  display: grid;
  gap: 8px;
  align-content: start;
  padding: 18px;
  background: var(--ink-2);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}

.page-about .about-field-index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-field-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-field p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--gray-blue);
}

/* ---------- 发展历程 ---------- */
.page-about .about-timeline {
  position: relative;
  max-width: var(--shell);
  margin: clamp(24px, 4vw, 40px) auto 0;
  padding: 0 var(--gutter);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: var(--gutter);
  right: var(--gutter);
  top: 6px;
  height: 2px;
  background: rgba(14, 27, 44, 0.18);
}

.page-about .about-timeline-track {
  display: flex;
  gap: 14px;
  padding: 24px 0 12px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-tl-item {
  position: relative;
  flex: 0 0 min(78vw, 292px);
  scroll-snap-align: start;
  display: grid;
  gap: 10px;
  align-content: start;
  padding: 18px 16px 20px;
  background: var(--sand);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  top: -20px;
  left: 0;
  width: 14px;
  height: 14px;
  background: var(--orange);
  clip-path: polygon(0 0, 100% 0, 100% 62%, 62% 100%, 0 100%);
}

.page-about .about-stamp {
  display: inline-grid;
  justify-items: start;
  gap: 2px;
  width: fit-content;
  padding: 6px 10px;
  background: var(--ink);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
}

.page-about .about-stamp-year {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.1;
  color: var(--orange);
}

.page-about .about-stamp-note {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--gray-blue);
}

.page-about .about-tl-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-tl-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-2);
}

/* ---------- 团队与合作 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .about-team-main {
  display: grid;
  gap: clamp(20px, 3vw, 30px);
  align-content: start;
}

.page-about .about-bars {
  display: grid;
  gap: 16px;
}

.page-about .about-bar-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 6px 12px;
}

.page-about .about-bar-label {
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
}

.page-about .about-bar-num {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--orange-dark);
}

.page-about .about-bar-track {
  grid-column: 1 / -1;
  display: block;
  height: 10px;
  background: rgba(14, 27, 44, 0.1);
}

.page-about .about-bar-fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--orange), var(--orange-dark));
}

.page-about .about-bar-fill--7 {
  width: 38.9%;
}

.page-about .about-bar-fill--4,
.page-about .about-bar-fill--4b {
  width: 22.2%;
}

.page-about .about-bar-fill--3 {
  width: 16.7%;
}

.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-partner {
  display: grid;
  gap: 8px;
  align-content: start;
  padding: 20px 18px;
  background: var(--ink);
  color: var(--paper);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}

.page-about .about-partner-index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-partner h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-partner p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--gray-blue);
}

/* ---------- 服务承诺 ---------- */
.page-about .about-pledges {
  display: grid;
  gap: 0;
  margin-top: clamp(26px, 4vw, 44px);
  border-top: 1px solid var(--line-dark);
}

.page-about .about-pledge {
  position: relative;
  display: grid;
  gap: 6px;
  padding: 20px 0 20px 18px;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-pledge::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  bottom: 22px;
  width: 3px;
  background: var(--orange);
}

.page-about .about-pledge-key {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--orange);
}

.page-about .about-pledge h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-pledge p {
  max-width: 34rem;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-2);
}

/* ---------- 结尾行动 ---------- */
.page-about .about-section--cta {
  background: var(--ink-deep);
  color: var(--sand);
}

.page-about .about-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
  align-items: center;
}

.page-about .about-cta-copy {
  display: grid;
  gap: 10px;
}

.page-about .about-cta-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4.4vw, 42px);
  line-height: 1.05;
  color: var(--paper);
}

.page-about .about-cta-copy p {
  max-width: 34rem;
  font-size: 15px;
  color: var(--gray-blue);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 16px;
}

.page-about .about-cta .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 12px 22px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
}

.page-about .about-cta .btn-primary {
  background: var(--orange);
  color: var(--paper);
}

.page-about .about-cta .btn-primary:hover,
.page-about .about-cta .btn-primary:focus-visible {
  background: var(--orange-dark);
}

.page-about .about-cta .btn-ghost {
  background: transparent;
  color: var(--cyan);
  border: 1px solid rgba(61, 224, 200, 0.55);
}

.page-about .about-cta .btn-ghost:hover,
.page-about .about-cta .btn-ghost:focus-visible {
  border-color: var(--cyan);
}

.page-about .about-link--plain {
  color: var(--gray-blue);
  border-bottom-color: rgba(147, 166, 186, 0.5);
}

.page-about .about-link--plain:hover,
.page-about .about-link--plain:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 断点 ---------- */
@media (min-width: 560px) {
  .page-about .about-strip-inner {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-strip-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding: 16px 0 16px 16px;
    border-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-strip-item:first-child {
    padding-left: 0;
    border-left: 0;
  }
}

@media (min-width: 720px) {
  .page-about .about-map {
    grid-template-columns: minmax(0, 1fr) 30px minmax(0, 1fr) 30px minmax(0, 1fr);
    align-items: stretch;
  }

  .page-about .about-map-link {
    width: 100%;
    height: 2px;
    align-self: center;
    transform: skewY(-14deg);
    background: linear-gradient(90deg, var(--orange), rgba(232, 70, 42, 0));
  }

  .page-about .about-fields {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
  }

  .page-about .about-maintain {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: center;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }

  .page-about .about-cta-actions {
    justify-content: flex-end;
  }

  .page-about .about-pledges {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    border-top: 0;
  }

  .page-about .about-pledge {
    padding: 4px 20px 4px 20px;
    border-bottom: 0;
    border-left: 1px solid var(--line-dark);
  }

  .page-about .about-pledge:first-child {
    border-left: 0;
    padding-left: 18px;
  }

  .page-about .about-pledge::before {
    display: none;
  }

  .page-about .about-pledge:first-child::before {
    display: block;
    top: 0;
    bottom: 0;
  }
}

@media (min-width: 1000px) {
  .page-about .about-map-row {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-partners {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline-track {
    scroll-behavior: auto;
  }
}