.page-about {
  --about-shell: clamp(1rem, 4vw, 4rem);
  --about-gap: clamp(1.5rem, 4vw, 4rem);
  --about-card-shadow: 0 12px 32px rgba(11, 31, 63, 0.08);
  background: var(--c-light);
  color: var(--c-dark);
}

.page-about .breadcrumb {
  max-width: var(--max-width);
  margin-inline: auto;
  padding: 1.25rem var(--about-shell) 0;
}

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

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

.page-about .section-heading {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  align-items: start;
  margin-bottom: 2.5rem;
}

.page-about .section-heading__index {
  font-family: var(--font-display);
  font-size: 1rem;
  line-height: 1.2;
  color: var(--c-orange);
  padding-top: 0.35rem;
}

.page-about .section-heading h2 {
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  font-weight: 900;
  line-height: 1.2;
  margin: 0 0 0.35rem;
}

.page-about .section-heading p {
  margin: 0;
  max-width: 54rem;
  line-height: 1.6;
}

/* 01 我们是谁 */
.page-about .about-who {
  background: var(--c-deep-sea);
  color: var(--c-white);
  padding: clamp(2.5rem, 6vw, 6rem) var(--about-shell);
}

.page-about .about-who__inner {
  display: grid;
  gap: var(--about-gap);
  grid-template-columns: 1fr;
  max-width: var(--max-width);
  margin-inline: auto;
  align-items: end;
}

.page-about .about-who__kicker {
  font-size: 0.78rem;
  font-weight: 300;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-green);
  margin: 0 0 0.75rem;
}

.page-about .about-who__copy h1 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 4.2rem);
  font-weight: 900;
  line-height: 1.05;
  margin: 0 0 0.75rem;
  letter-spacing: -0.02em;
}

.page-about .about-who__lead {
  font-size: clamp(1rem, 2vw, 1.35rem);
  font-weight: 300;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.85);
  margin: 0 0 1.5rem;
  max-width: 42rem;
}

.page-about .about-who__body p {
  font-size: 1rem;
  line-height: 1.75;
  margin: 0 0 1rem;
  max-width: 48rem;
}

.page-about .about-who__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.page-about .about-who__figure {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

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

/* 章节轨道 */
.page-about .about-rail {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  max-width: var(--max-width);
  margin-inline: auto;
  padding: 1.25rem var(--about-shell) 0;
}

.page-about .about-rail__link {
  text-decoration: none;
  color: var(--c-dark);
  font-size: 0.9rem;
  font-weight: 700;
  border: 1px solid var(--c-gray);
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
  background: var(--c-white);
  transition: border-color 0.3s cubic-bezier(0.22, 1, 0.36, 1), color 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

.page-about .about-rail__link span {
  color: var(--c-orange);
  margin-right: 0.25rem;
  font-family: var(--font-display);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus {
  border-color: var(--c-orange);
  color: var(--c-orange);
}

/* 02 发展里程碑 */
.page-about .about-milestones {
  background: var(--c-light);
  padding: clamp(2.5rem, 6vw, 6rem) var(--about-shell);
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: 2rem;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: var(--c-gray);
}

.page-about .about-timeline__period {
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 1rem;
  min-width: 0;
}

.page-about .about-timeline__year {
  font-family: var(--font-display);
  font-size: 1.35rem;
  line-height: 1.2;
  white-space: nowrap;
  padding-left: 2rem;
  position: relative;
  color: var(--c-dark);
}

.page-about .about-timeline__year::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0.35rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-orange);
  border: 3px solid var(--c-white);
  box-shadow: 0 0 0 1px var(--c-orange);
}

.page-about .about-timeline__content {
  background: var(--c-white);
  border: 1px solid var(--c-gray);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--about-card-shadow);
  min-width: 0;
}

.page-about .about-timeline__content h3 {
  margin: 0 0 0.5rem;
  font-size: 1.25rem;
  font-weight: 900;
}

.page-about .about-timeline__content p {
  margin: 0;
  line-height: 1.6;
}

.page-about .about-timeline__content > a {
  display: inline-block;
  margin-top: 0.85rem;
  color: var(--c-orange);
  text-decoration: none;
  font-weight: 700;
}

.page-about .about-timeline__tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 0.2rem 0.7rem;
  border-radius: 999px;
  background: rgba(255, 107, 0, 0.1);
  border: 1px solid rgba(255, 107, 0, 0.3);
  color: var(--c-orange);
  margin-bottom: 0.7rem;
}

/* 03 规模覆盖 */
.page-about .about-scale {
  background: var(--c-teal);
  color: var(--c-white);
  padding: clamp(2.5rem, 6vw, 6rem) var(--about-shell);
}

.page-about .about-scale .section-heading h2,
.page-about .about-scale .section-heading p {
  color: var(--c-white);
}

.page-about .about-scale .section-heading__index {
  color: var(--c-green);
}

.page-about .about-scale__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.page-about .about-stat {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius);
  padding: 1.1rem 1rem;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-display);
  font-size: 2rem;
  line-height: 1.1;
  color: var(--c-orange);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.75);
}

.page-about .about-scale__panel {
  display: grid;
  gap: 1.5rem;
  align-items: center;
}

.page-about .about-scale__figure {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius);
}

.page-about .about-scale__figure img {
  display: block;
  width: 100%;
  aspect-ratio: 8 / 5;
  object-fit: cover;
}

.page-about .about-scale__note h3 {
  font-size: 1.4rem;
  margin: 0 0 0.75rem;
  color: var(--c-white);
}

.page-about .about-scale__note p {
  margin: 0 0 1rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.85);
}

.page-about .about-scale__note ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.page-about .about-scale__note li {
  position: relative;
  padding-left: 1.4rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.92);
}

.page-about .about-scale__note li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6rem;
  width: 8px;
  height: 8px;
  background: var(--c-green);
  border-radius: 2px;
}

/* 04 资质与安全 */
.page-about .about-qualifications {
  background: var(--c-deep-sea);
  color: var(--c-white);
  padding: clamp(2.5rem, 6vw, 6rem) var(--about-shell);
}

.page-about .about-qualifications .section-heading h2,
.page-about .about-qualifications .section-heading p {
  color: var(--c-white);
}

.page-about .about-qualifications__grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}

.page-about .about-qual-card {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius);
  padding: 1.5rem 1.5rem 1.5rem 1.75rem;
}

.page-about .about-qual-card__index {
  position: absolute;
  right: 0.75rem;
  top: 0.4rem;
  font-family: var(--font-display);
  font-size: 2.75rem;
  line-height: 1;
  color: rgba(255, 255, 255, 0.08);
}

.page-about .about-qual-card h3 {
  font-size: 1.2rem;
  margin: 0 0 0.5rem;
  color: var(--c-white);
}

.page-about .about-qual-card p {
  margin: 0;
  max-width: 34rem;
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.6;
}

.page-about .about-qualifications__note {
  margin: 2rem 0 0;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.55);
  line-height: 1.6;
}

/* 05 团队与服务理念 */
.page-about .about-team {
  background: var(--c-light);
  padding: clamp(2.5rem, 6vw, 6rem) var(--about-shell);
}

.page-about .about-team__grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}

.page-about .about-team__card {
  background: var(--c-white);
  border: 1px solid var(--c-gray);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--about-card-shadow);
}

.page-about .about-team__role {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-teal);
  margin-bottom: 0.75rem;
}

.page-about .about-team__card h3 {
  font-size: 1.25rem;
  margin: 0 0 0.5rem;
}

.page-about .about-team__card p {
  margin: 0;
  line-height: 1.65;
  color: var(--c-dark);
}

.page-about .about-team__service {
  display: grid;
  gap: 1.5rem;
  align-items: center;
  margin-top: 2.5rem;
}

.page-about .about-team__figure {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius);
}

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

.page-about .about-team__promise h3 {
  font-size: 1.5rem;
  margin: 0 0 0.75rem;
}

.page-about .about-team__promise p {
  margin: 0 0 1rem;
  line-height: 1.7;
}

.page-about .about-team__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

/* 桌面端增强 */
@media (min-width: 768px) {
  .page-about .about-timeline__list {
    gap: 3rem;
  }

  .page-about .about-timeline__list::before {
    left: 200px;
  }

  .page-about .about-timeline__period {
    grid-template-columns: 200px 1fr;
    column-gap: 3rem;
  }

  .page-about .about-timeline__year {
    text-align: right;
    padding-left: 0;
    padding-right: 2rem;
    font-size: 1.75rem;
  }

  .page-about .about-timeline__year::before {
    left: auto;
    right: -7px;
  }

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

  .page-about .about-timeline__content--wide {
    max-width: 820px;
  }

  .page-about .about-timeline__content--narrow {
    max-width: 480px;
  }

  .page-about .about-scale__stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
  }

  .page-about .about-stat__num {
    font-size: 2.6rem;
  }

  .page-about .about-scale__panel {
    grid-template-columns: 1.1fr 1fr;
    gap: 3rem;
  }

  .page-about .about-qualifications__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
    padding-bottom: 1.5rem;
  }

  .page-about .about-qual-card:nth-child(2),
  .page-about .about-qual-card:nth-child(4) {
    transform: translateY(2rem);
  }

  .page-about .about-qualifications__note {
    margin-top: 2.5rem;
  }

  .page-about .about-team__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
    align-items: start;
  }

  .page-about .about-team__card:nth-child(2) {
    transform: translateY(2rem);
  }

  .page-about .about-team__card:nth-child(3) {
    transform: translateY(0.75rem);
  }

  .page-about .about-team__service {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-who {
    background: linear-gradient(135deg, var(--c-deep-sea) 0%, var(--c-deep-sea) 55%, var(--c-light) 55%, var(--c-light) 100%);
  }

  .page-about .about-who__inner {
    grid-template-columns: 1.05fr 0.95fr;
    gap: clamp(2rem, 5vw, 5rem);
  }

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

  .page-about .about-who__figure img {
    aspect-ratio: 16 / 6;
  }
}