.page-about {
  position: relative;
  background: var(--warm-white);
  color: var(--c-text);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-about .container {
  width: min(100% - 48px, var(--container-max));
  margin-inline: auto;
}

/* 面包屑 */
.page-about .breadcrumb {
  color: var(--c-muted);
  font-size: 13px;
  padding-top: var(--space-5);
}

.page-about .breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
}

.page-about .breadcrumb li {
  display: inline-flex;
  align-items: center;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: var(--space-2);
  color: var(--c-muted);
}

.page-about .breadcrumb a {
  color: var(--c-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.page-about .breadcrumb a:hover {
  color: var(--c-primary);
  border-bottom-color: var(--c-primary);
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--c-text);
  font-weight: 500;
}

/* 开场标题 */
.page-about .about-heading {
  padding: var(--space-6) 0 var(--space-7);
}

.page-about .about-heading__seasons {
  display: flex;
  gap: 4px;
  height: 4px;
  width: 100%;
  max-width: 240px;
  margin-bottom: var(--space-5);
}

.page-about .about-heading__seasons span {
  display: block;
  flex: 1;
  height: 100%;
}

.page-about .about-heading__seasons span:nth-child(1) { background: var(--spring-green); }
.page-about .about-heading__seasons span:nth-child(2) { background: var(--summer-blue); }
.page-about .about-heading__seasons span:nth-child(3) { background: var(--autumn-orange); }
.page-about .about-heading__seasons span:nth-child(4) { background: var(--winter-silver); }

.page-about .about-heading__kicker {
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-secondary);
  margin: 0 0 var(--space-3);
}

.page-about .about-heading h1 {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 7vw, 4.8rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: 0.01em;
  margin: 0 0 var(--space-5);
  max-width: 15em;
}

.page-about .about-heading__lead {
  font-size: 17px;
  line-height: 1.75;
  margin: 0 0 var(--space-6);
  max-width: 44em;
}

.page-about .toc {
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
  padding: var(--space-4) 0 var(--space-4);
}

.page-about .toc__label {
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-muted);
  margin: 0 0 var(--space-3);
}

.page-about .toc ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0;
}

.page-about .toc-link {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--c-line);
  text-decoration: none;
  color: var(--c-text);
  font-weight: 500;
  transition: color 0.2s, padding-left 0.2s;
}

.page-about .toc-link:hover {
  color: var(--c-accent);
  padding-left: var(--space-2);
}

.page-about .toc-index {
  font-family: var(--font-display);
  font-size: 13px;
  color: var(--c-secondary);
}

/* 章节标题 */
.page-about .section-head {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.page-about .section-index {
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-accent);
}

.page-about .section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4.5vw, 3rem);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: 0.01em;
  margin: 0;
}

.page-about .section-intro {
  font-size: 15px;
  line-height: 1.6;
  color: var(--c-muted);
  margin: 0;
  max-width: 34em;
}

/* 故事区 */
.page-about .about-story {
  padding: var(--space-7) 0 var(--space-8);
  border-top: 1px solid var(--c-line);
}

.page-about .about-story__grid {
  display: grid;
  gap: var(--space-6);
  align-items: start;
}

.page-about .about-story__body p {
  margin: 0 0 var(--space-4);
  line-height: 1.75;
  max-width: 38em;
}

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

.page-about .about-story__media,
.page-about .about-stats__media,
.page-about .about-team__media {
  margin: 0;
  width: 100%;
}

.page-about .about-story__media img,
.page-about .about-stats__media img,
.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-story__media {
  aspect-ratio: 5 / 3;
}

/* 数据规模区 */
.page-about .about-stats {
  background:
    linear-gradient(rgba(230, 236, 240, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(230, 236, 240, 0.05) 1px, transparent 1px),
    var(--ink-blue);
  background-size: 32px 32px;
  color: var(--winter-silver);
  padding: var(--space-8) 0;
}

.page-about .about-stats .section-head h2 {
  color: var(--warm-white);
}

.page-about .about-stats .section-intro {
  color: rgba(230, 236, 240, 0.72);
}

.page-about .about-stats__grid {
  display: grid;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.page-about .about-stats__item {
  background: var(--warm-white);
  border: 1px solid rgba(230, 236, 240, 0.2);
  border-left: 4px solid var(--spring-green);
  padding: var(--space-5);
}

.page-about .about-stats__item:nth-child(2) {
  border-left-color: var(--summer-blue);
}

.page-about .about-stats__item:nth-child(3) {
  border-left-color: var(--autumn-orange);
}

.page-about .about-stats__item:nth-child(4) {
  border-left-color: var(--grape-purple);
}

.page-about .about-stats__number {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5vw, 3.4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--deep-space);
  margin: var(--space-3) 0 var(--space-2);
}

.page-about .about-stats__desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-muted);
  margin: 0;
}

.page-about .about-stats__media {
  aspect-ratio: 3 / 2;
  border: 1px solid rgba(230, 236, 240, 0.18);
}

/* 时间轴区 */
.page-about .about-timeline {
  padding: var(--space-8) 0;
  border-top: 1px solid var(--c-line);
}

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

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 var(--space-6) var(--space-7);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 12px;
  width: 1px;
  height: 100%;
  background: var(--c-line);
}

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

.page-about .about-timeline__dot {
  position: absolute;
  left: 4px;
  top: 10px;
  width: 15px;
  height: 15px;
  border: 3px solid var(--c-accent);
  border-radius: 50%;
  background: var(--warm-white);
  box-sizing: border-box;
}

.page-about .about-timeline__item:nth-child(1) .about-timeline__dot {
  border-color: var(--spring-green);
}

.page-about .about-timeline__item:nth-child(2) .about-timeline__dot {
  border-color: var(--summer-blue);
}

.page-about .about-timeline__item:nth-child(3) .about-timeline__dot {
  border-color: var(--autumn-orange);
}

.page-about .about-timeline__item:nth-child(4) .about-timeline__dot {
  border-color: var(--grape-purple);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-display);
  font-size: 1.9rem;
  font-weight: 600;
  line-height: 1.1;
  color: var(--c-secondary);
  margin-bottom: var(--space-2);
}

.page-about .about-timeline__card {
  background: var(--winter-silver);
  border-left: 3px solid var(--c-accent);
  padding: var(--space-4);
}

.page-about .about-timeline__item:nth-child(1) .about-timeline__card {
  border-left-color: var(--spring-green);
}

.page-about .about-timeline__item:nth-child(2) .about-timeline__card {
  border-left-color: var(--summer-blue);
}

.page-about .about-timeline__item:nth-child(3) .about-timeline__card {
  border-left-color: var(--autumn-orange);
}

.page-about .about-timeline__item:nth-child(4) .about-timeline__card {
  border-left-color: var(--grape-purple);
}

.page-about .about-timeline__card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.3;
  margin: 0 0 var(--space-2);
}

.page-about .about-timeline__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-muted);
}

/* 团队与服务 */
.page-about .about-team {
  background: var(--winter-silver);
  padding: var(--space-8) 0;
  border-top: 1px solid var(--c-line);
}

.page-about .about-team__grid {
  display: grid;
  gap: var(--space-6);
}

.page-about .about-team__content p {
  margin: 0 0 var(--space-4);
  line-height: 1.75;
  max-width: 38em;
}

.page-about .about-team__highlight {
  border-left: 4px solid var(--c-accent);
  padding-left: var(--space-4);
  font-weight: 500;
  color: var(--deep-space);
}

.page-about .about-team__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

.page-about .about-team__media {
  aspect-ratio: 8 / 5;
  align-self: center;
}

/* 品牌承诺 */
.page-about .about-trust {
  background: var(--deep-space);
  color: var(--winter-silver);
  padding: var(--space-8) 0;
}

.page-about .about-trust__statement {
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 3vw, 2.1rem);
  font-weight: 500;
  line-height: 1.5;
  max-width: 20em;
  margin: 0 0 var(--space-5);
}

.page-about .about-trust__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.page-about .about-trust__links a {
  color: var(--spring-green);
  text-decoration: none;
  border-bottom: 1px solid rgba(155, 207, 107, 0.4);
  padding-bottom: 2px;
  transition: color 0.2s, border-color 0.2s;
}

.page-about .about-trust__links a:hover {
  color: var(--winter-silver);
  border-color: var(--winter-silver);
}

/* 桌面端布局 */
@media (min-width: 768px) {
  .page-about .about-heading {
    padding-top: var(--space-8);
  }

  .page-about .about-heading h1 {
    font-size: clamp(3rem, 6vw, 5.6rem);
    max-width: 13em;
  }

  .page-about .about-heading__lead {
    font-size: 18px;
  }

  .page-about .toc ul {
    grid-template-columns: 1fr 1fr;
    column-gap: var(--space-7);
  }

  .page-about .about-story {
    padding-top: var(--space-8);
  }

  .page-about .about-story__grid {
    grid-template-columns: 7fr 5fr;
    column-gap: var(--space-8);
  }

  .page-about .about-story__body {
    padding-top: var(--space-2);
  }

  .page-about .about-stats__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-5);
  }

  .page-about .about-stats__media {
    aspect-ratio: 3 / 1;
  }

  .page-about .about-timeline__item {
    max-width: 80%;
  }

  .page-about .about-team__grid {
    grid-template-columns: 6fr 4fr;
    column-gap: var(--space-8);
  }

  .page-about .about-team__media {
    justify-self: end;
    width: 100%;
    max-width: 420px;
  }

  .page-about .about-trust {
    padding: var(--space-9) 0;
  }
}