.page-about {
  --about-hero-title: clamp(2.4rem, 5vw, 4.6rem);
  --about-hero-lead: clamp(1.05rem, 1.6vw, 1.35rem);
  background: var(--space);
  color: var(--offwhite);
}

.page-about .container {
  max-width: 1200px;
  margin: 0 auto;
  padding-inline: 1.5rem;
  position: relative;
}

.page-about .breadcrumb {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  font-size: 0.875rem;
  color: var(--gray);
  margin-bottom: 1.75rem;
}

.page-about .breadcrumb a {
  color: var(--gray);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .breadcrumb a:hover {
  color: var(--teal);
}

.page-about .breadcrumb span[aria-hidden="true"] {
  color: var(--gray);
  opacity: 0.5;
}

.page-about .eyebrow {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange);
  margin-bottom: 1rem;
}

/* ---------- 首屏 ---------- */
.page-about .p-about-hero {
  position: relative;
  background: linear-gradient(135deg, var(--space) 0%, var(--space-2) 60%, var(--indigo) 100%);
  padding: 8rem 0 5rem;
  overflow: hidden;
}

.page-about .p-about-hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.25;
  z-index: 0;
}

.page-about .p-about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  z-index: 1;
}

.page-about .p-about-hero__main {
  position: relative;
  z-index: 1;
}

.page-about .p-about-hero__title {
  font-family: var(--font-display);
  font-size: var(--about-hero-title);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.02em;
  max-width: 12ch;
  margin-bottom: 1.5rem;
  text-wrap: balance;
}

.page-about .p-about-hero__lead {
  font-size: var(--about-hero-lead);
  line-height: 1.75;
  color: var(--gray);
  max-width: 52ch;
  margin-bottom: 2.25rem;
}

.page-about .p-about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.page-about .p-about-hero__side {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  position: relative;
  z-index: 1;
}

.page-about .p-about-hero__stat {
  background: rgba(10, 30, 47, 0.7);
  border: 1px solid var(--line);
  padding: 1.5rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.page-about .p-about-hero__stat .stat-number {
  font-family: var(--font-display);
  font-size: 2.6rem;
  font-weight: 800;
  color: var(--orange);
  line-height: 1;
}

.page-about .p-about-hero__stat .stat-label {
  font-size: 0.875rem;
  color: var(--gray);
}

/* ---------- 品牌初衷 ---------- */
.page-about .p-about-origin {
  padding: 6rem 0;
}

.page-about .p-about-origin__inner {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2rem;
}

.page-about .p-about-origin__index .panel__index {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 800;
  color: var(--orange);
  line-height: 1;
}

.page-about .p-about-origin__content .section-title,
.page-about .p-about-values__head .section-title,
.page-about .p-about-service__content .section-title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.6rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1.25rem;
}

.page-about .p-about-origin__content .lead {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--gray);
  margin-bottom: 3rem;
  max-width: 60ch;
}

.page-about .p-about-origin__point {
  border-top: 1px solid var(--line);
  padding-top: 1.25rem;
}

.page-about .p-about-origin__point .tag-label {
  display: inline-block;
  margin-bottom: 1rem;
}

.page-about .p-about-origin__point p {
  color: var(--gray);
  line-height: 1.7;
  font-size: 0.95rem;
}

/* ---------- 版本演进 ---------- */
.page-about .p-about-versions {
  padding: 6rem 0;
  background: linear-gradient(180deg, var(--indigo) 0%, var(--space-2) 100%);
  position: relative;
}

.page-about .p-about-versions__head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-bottom: 4rem;
}

.page-about .p-about-versions__head .section-subtitle {
  font-size: 1.05rem;
  color: var(--gray);
  line-height: 1.7;
  max-width: 55ch;
}

.page-about .p-about-timeline {
  position: relative;
  padding-inline-start: 2rem;
  display: flex;
  flex-direction: column;
  gap: 3.5rem;
}

.page-about .p-about-timeline__rail {
  position: absolute;
  left: 0.5rem;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--orange), var(--teal));
  opacity: 0.5;
}

.page-about .p-about-version {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-about .p-about-version__marker {
  position: absolute;
  left: -2rem;
  top: 0.25rem;
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  background: var(--orange);
  border: 2px solid var(--space);
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about .p-about-version__marker span {
  display: none;
}

.page-about .p-about-version__card {
  background: rgba(10, 30, 47, 0.55);
  border: 1px solid var(--line);
  border-left: 3px solid var(--teal);
  padding: 1.75rem;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.page-about .p-about-version__card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.25);
}

.page-about .p-about-version__tag {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal);
  border: 1px solid rgba(0, 194, 168, 0.4);
  padding: 0.3rem 0.75rem;
  margin-bottom: 1rem;
}

.page-about .p-about-version__card h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--offwhite);
}

.page-about .p-about-version__card p {
  color: var(--gray);
  line-height: 1.7;
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.page-about .p-about-version--v4 .p-about-version__card {
  border-left-color: var(--orange);
}

.page-about .p-about-version--v4 .p-about-version__tag {
  color: var(--orange);
  border-color: rgba(255, 122, 0, 0.4);
}

.page-about .p-about-versions__phone {
  display: block;
  max-width: 280px;
  height: auto;
  margin: 4rem auto 0;
  border-radius: 12px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

/* ---------- 品牌价值支柱 ---------- */
.page-about .p-about-values {
  padding: 6rem 0;
  background: var(--space);
}

.page-about .p-about-values__head {
  margin-bottom: 3.5rem;
}

.page-about .p-about-values__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.page-about .p-about-value {
  border: 1px solid var(--line);
  background: var(--space-2);
  padding: 2rem;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.page-about .p-about-value:hover {
  transform: translateY(-3px);
  border-color: rgba(0, 194, 168, 0.3);
}

.page-about .p-about-value__num {
  font-family: var(--font-display);
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--teal);
  display: block;
  margin-bottom: 1.5rem;
}

.page-about .p-about-value h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--offwhite);
}

.page-about .p-about-value p {
  color: var(--gray);
  line-height: 1.75;
  font-size: 0.95rem;
}

/* ---------- 服务承诺 ---------- */
.page-about .p-about-service {
  padding: 6rem 0;
  background: linear-gradient(120deg, var(--deep-teal) 0%, var(--space-2) 100%);
}

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

.page-about .p-about-service__content .panel__index {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 800;
  color: var(--orange);
  line-height: 1;
  display: block;
  margin-bottom: 1rem;
}

.page-about .p-about-service__content .lead {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--gray);
  max-width: 55ch;
  margin-bottom: 2.5rem;
}

.page-about .p-about-service__list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.page-about .p-about-service__item {
  border-left: 2px solid var(--teal);
  padding-left: 1.5rem;
}

.page-about .p-about-service__item h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--offwhite);
  margin-bottom: 0.5rem;
}

.page-about .p-about-service__item p {
  color: var(--gray);
  font-size: 0.92rem;
  line-height: 1.7;
}

.page-about .p-about-service__visual img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  border: 1px solid var(--line);
  display: block;
}

/* ---------- 使命结语 ---------- */
.page-about .p-about-mission {
  padding: 5rem 0;
  background: var(--space);
  text-align: center;
}

.page-about .p-about-mission__quote {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.4rem);
  font-weight: 800;
  line-height: 1.2;
  color: var(--offwhite);
  max-width: 20ch;
  margin: 0 auto 1.5rem;
}

.page-about .p-about-mission__text {
  color: var(--gray);
  line-height: 1.8;
  font-size: 0.95rem;
  max-width: 55ch;
  margin: 0 auto 2rem;
}

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

/* ---------- 桌面端适配 ---------- */
@media (min-width: 768px) {
  .page-about .container {
    padding-inline: 2rem;
  }

  .page-about .p-about-hero {
    padding: 9rem 0 6rem;
  }

  .page-about .p-about-hero__grid {
    grid-template-columns: 3fr 2fr;
    gap: 4rem;
    align-items: end;
  }

  .page-about .p-about-hero__side {
    grid-template-columns: 1fr;
    gap: 1rem;
    padding-bottom: 2rem;
  }

  .page-about .p-about-hero__stat {
    padding: 1.75rem 1.5rem;
  }

  .page-about .p-about-origin {
    padding: 7rem 0;
  }

  .page-about .p-about-origin__inner {
    grid-template-columns: 80px 1fr;
    gap: 4rem;
  }

  .page-about .p-about-versions {
    padding: 7rem 0;
  }

  .page-about .p-about-versions__head {
    grid-template-columns: 1fr 1fr;
    align-items: end;
    gap: 3rem;
  }

  .page-about .p-about-timeline {
    padding-inline-start: 3rem;
  }

  .page-about .p-about-version {
    grid-template-columns: 120px 1fr;
  }

  .page-about .p-about-version__marker {
    left: -3rem;
    width: 1.5rem;
    height: 1.5rem;
  }

  .page-about .p-about-version__marker span {
    display: block;
    font-family: var(--font-display);
    font-size: 0.6rem;
    font-weight: 700;
    color: var(--space);
    background: var(--orange);
    width: 2.4rem;
    height: 2.4rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    top: -0.5rem;
    left: 0;
  }

  .page-about .p-about-version__marker {
    background: transparent;
    border: 0;
    width: 2.4rem;
    height: 2.4rem;
  }

  .page-about .p-about-version__card {
    padding: 2.25rem;
  }

  .page-about .p-about-values {
    padding: 7rem 0;
  }

  .page-about .p-about-values__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
  }

  .page-about .p-about-service {
    padding: 7rem 0;
  }

  .page-about .p-about-service__grid {
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
  }

  .page-about .p-about-mission {
    padding: 6rem 0;
  }
}