.page-about {
  background: var(--color-bg);
  color: var(--color-text);
}

/* ------------------------------------ */
/* 页面标题区 */
/* ------------------------------------ */
.page-about .about-hero {
  padding: 2.5rem 0 4.5rem;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4.5vw, 4.25rem);
  line-height: 1.12;
  color: var(--color-blue);
  margin: 1.25rem 0 1.75rem;
  letter-spacing: 0.01em;
  max-width: 1000px;
}

.page-about .about-hero__lead {
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--color-muted);
  max-width: 780px;
  border-left: 4px solid var(--color-orange);
  padding-left: 1.25rem;
  margin: 0;
}

.page-about .about-hero__chapters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2.5rem;
}

.page-about .about-hero__chapters a {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-blue);
  background: #fff;
  border: 2px solid var(--color-blue);
  padding: 0.5rem 1rem;
  text-decoration: none;
  transition: background 0.2s, color 0.2s, transform 0.15s;
}

.page-about .about-hero__chapters a:hover,
.page-about .about-hero__chapters a:focus-visible {
  background: var(--color-orange);
  color: #fff;
  transform: translate(2px, 2px);
}

/* ------------------------------------ */
/* 章节通用框架 */
/* ------------------------------------ */
.page-about .about-chapter {
  padding: 4.5rem 0;
  border-bottom: 2px solid var(--color-line);
}

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

.page-about .about-chapter__rail {
  display: flex;
  flex-direction: row;
  align-items: flex-end;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 4px solid var(--color-blue);
}

.page-about .about-chapter__name {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-muted);
  writing-mode: horizontal-tb;
  margin-bottom: 0.25rem;
}

.page-about .about-chapter__body {
  min-width: 0;
}

.page-about .about-chapter__title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.75rem);
  color: var(--color-blue);
  line-height: 1.2;
  margin: 0 0 1.25rem;
}

.page-about .about-chapter__lead {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--color-muted);
  margin: 0 0 1.5rem;
}

.page-about .about-chapter:hover .section-index {
  background: var(--color-orange);
  color: #fff;
}

/* ------------------------------------ */
/* 章节背景变体 */
/* ------------------------------------ */
.page-about .about-chapter--journey {
  background: #fff;
}

.page-about .about-chapter--stats {
  background: var(--color-bg);
  border-top: 6px solid var(--color-orange);
  border-bottom: 6px solid var(--color-orange);
}

.page-about .about-chapter--team {
  background: #fff;
}

.page-about .about-chapter--compliance {
  background: var(--color-blue);
  color: #fff;
  border-bottom: none;
}

.page-about .about-chapter--compliance .about-chapter__title,
.page-about .about-chapter--compliance .about-chapter__lead {
  color: #fff;
}

.page-about .about-chapter--compliance .about-chapter__lead {
  color: rgba(255, 255, 255, 0.82);
}

.page-about .about-chapter--compliance .about-chapter__rail {
  border-bottom-color: var(--color-orange);
}

.page-about .about-chapter--compliance .section-index {
  background: transparent;
  color: var(--color-orange);
}

/* ------------------------------------ */
/* 图片与说明牌 */
/* ------------------------------------ */
.page-about .about-figure {
  margin: 0 0 2.5rem;
}

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

.page-about .about-figure__caption {
  display: inline-block;
  margin-top: 0.75rem;
  padding: 0.5rem 0.9rem;
  background: var(--color-blue);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.05em;
}

.page-about .about-chapter--compliance .about-figure__caption {
  background: var(--color-orange);
  color: var(--color-blue);
}

/* ------------------------------------ */
/* 图文并排的简介区 */
/* ------------------------------------ */
.page-about .about-chapter__intro {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
  margin-bottom: 3rem;
}

.page-about .about-chapter__intro .about-figure {
  margin: 0;
}

/* ------------------------------------ */
/* 发展时间轴 */
/* ------------------------------------ */
.page-about .about-timeline {
  list-style: none;
  margin: 3.5rem 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 2.25rem;
  padding-bottom: 3rem;
}

.page-about .about-timeline__item::before {
  content: '';
  position: absolute;
  left: 0.375rem;
  top: 0.75rem;
  bottom: 0;
  width: 3px;
  background: var(--color-line);
}

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

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__marker {
  position: absolute;
  left: 0;
  top: 0.75rem;
  width: 14px;
  height: 14px;
  background: var(--color-orange);
  border: 2px solid var(--color-blue);
  z-index: 1;
}

.page-about .about-timeline__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 2.125rem;
  font-weight: 700;
  line-height: 1.2;
  padding: 0.3rem 0.85rem;
  background: var(--color-orange);
  color: var(--color-blue);
  box-shadow: 5px 5px 0 var(--color-blue);
  margin-bottom: 1rem;
}

.page-about .about-timeline__card {
  background: #fff;
  border: 2px solid var(--color-blue);
  padding: 1.25rem 1.5rem;
  box-shadow: 4px 4px 0 var(--color-line);
  transition: border-color 0.2s, transform 0.15s, box-shadow 0.15s;
}

.page-about .about-timeline__card:hover,
.page-about .about-timeline__card:focus-within {
  border-color: var(--color-orange);
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--color-blue);
}

.page-about .about-timeline__card h3 {
  font-family: var(--font-display);
  font-size: 1.125rem;
  color: var(--color-blue);
  margin: 0 0 0.5rem;
  line-height: 1.3;
}

.page-about .about-timeline__card p {
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--color-muted);
  margin: 0;
}

/* ------------------------------------ */
/* 服务数据面板 */
/* ------------------------------------ */
.page-about .about-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 3rem;
}

.page-about .about-stats__panel {
  position: relative;
  padding: 2rem 1.75rem 2.25rem;
}

.page-about .about-stats__panel--blue {
  background: var(--color-blue);
  color: #fff;
}

.page-about .about-stats__panel--light {
  background: #fff;
  border: 3px solid var(--color-blue);
  color: var(--color-text);
}

.page-about .about-stats__panel--gold {
  background: var(--color-blue-soft);
  color: #fff;
  border: 3px solid var(--color-gold);
}

.page-about .about-stats__title {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-gold);
  margin: 0 0 1.25rem;
}

.page-about .about-stats__panel--blue .about-stats__title,
.page-about .about-stats__panel--gold .about-stats__title {
  color: var(--color-gold);
}

.page-about .about-stats__panel--light .about-stats__title {
  color: var(--color-orange);
}

.page-about .about-stats__number {
  font-family: var(--font-mono);
  font-size: clamp(2.25rem, 9vw, 4.5rem);
  font-weight: 700;
  line-height: 1.05;
  color: var(--color-orange);
  letter-spacing: -0.02em;
  transition: transform 0.15s, text-shadow 0.15s;
}

.page-about .about-stats__panel--light .about-stats__number {
  color: var(--color-blue);
}

.page-about .about-stats__panel--gold .about-stats__number {
  color: var(--color-gold);
}

.page-about .about-stats__number sup {
  font-size: 0.5em;
  vertical-align: super;
}

.page-about .about-stats__panel:hover .about-stats__number {
  transform: translate(-2px, -2px);
  text-shadow: 6px 6px 0 rgba(0, 0, 0, 0.15);
}

.page-about .about-stats__desc {
  font-size: 0.9375rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.8);
  margin: 0.5rem 0 1.25rem;
}

.page-about .about-stats__panel--light .about-stats__desc {
  color: var(--color-muted);
}

.page-about .about-stats__list {
  list-style: none;
  margin: 0;
  padding: 1.25rem 0 0;
  border-top: 1px solid rgba(255, 255, 255, 0.22);
}

.page-about .about-stats__panel--light .about-stats__list {
  border-top-color: var(--color-line);
}

.page-about .about-stats__list li {
  position: relative;
  padding-left: 1.25rem;
  margin-top: 0.65rem;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.85);
}

.page-about .about-stats__panel--light .about-stats__list li {
  color: var(--color-text);
}

.page-about .about-stats__list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 2px;
  background: var(--color-orange);
}

.page-about .about-stats__panel--gold .about-stats__list li::before {
  background: var(--color-gold);
}

/* ------------------------------------ */
/* 团队能力 */
/* ------------------------------------ */
.page-about .about-team__capabilities {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-about .about-team__capabilities li {
  border-left: 4px solid var(--color-orange);
  background: #fff;
  padding: 1.25rem 1.375rem;
  box-shadow: 3px 3px 0 var(--color-line);
}

.page-about .about-team__capabilities strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  color: var(--color-blue);
  margin-bottom: 0.35rem;
}

.page-about .about-team__capabilities li {
  color: var(--color-muted);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.page-about .about-team__facts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  margin-top: 3rem;
  border: 3px solid var(--color-blue);
}

.page-about .about-team__fact {
  padding: 1.75rem 1.25rem;
  border-right: 3px solid var(--color-blue);
  border-bottom: 3px solid var(--color-blue);
}

.page-about .about-team__fact:nth-child(2n) {
  border-right: none;
}

.page-about .about-team__fact:nth-child(n+3) {
  border-bottom: none;
}

.page-about .about-team__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.75rem, 6vw, 4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--color-orange);
  transition: transform 0.15s;
}

.page-about .about-team__fact:hover .about-team__num {
  transform: translateX(4px);
}

.page-about .about-team__label {
  display: block;
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--color-muted);
  margin-top: 0.5rem;
}

/* ------------------------------------ */
/* 品牌认证与合规 */
/* ------------------------------------ */
.page-about .about-compliance__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.page-about .about-compliance__plate {
  background: rgba(255, 255, 255, 0.06);
  border-left: 4px solid var(--color-orange);
  color: #fff;
}

.page-about .about-compliance__plate .data-plate__title {
  color: var(--color-gold);
}

.page-about .about-compliance__plate p {
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.75;
  margin: 0.75rem 0 0;
}

.page-about .about-compliance__plate strong {
  color: var(--color-gold);
  font-family: var(--font-mono);
  font-weight: 700;
}

.page-about .about-compliance__honors {
  border: 3px solid var(--color-gold);
  padding: 1.75rem 1.75rem 2rem;
  color: #fff;
}

.page-about .about-compliance__honors h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--color-gold);
  margin: 0 0 1rem;
  letter-spacing: 0.02em;
}

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

.page-about .about-compliance__honors li {
  position: relative;
  padding-left: 1.5rem;
  margin-top: 0.6rem;
  font-size: 0.9375rem;
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.85);
}

.page-about .about-compliance__honors li::before {
  content: '★';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--color-gold);
}

.page-about .about-compliance__factline {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
}

.page-about .about-compliance__factline p {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.75);
}

.page-about .about-compliance__factline strong {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-gold);
  font-weight: 700;
}

/* ------------------------------------ */
/* 底部继续浏览 */
/* ------------------------------------ */
.page-about .about-next {
  background: #fff;
  border-top: 8px solid var(--color-orange);
  padding: 4.5rem 0 5.5rem;
  text-align: center;
}

.page-about .about-next h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  color: var(--color-blue);
  margin: 1rem 0 2.25rem;
  line-height: 1.2;
}

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

/* ------------------------------------ */
/* 桌面端 */
/* ------------------------------------ */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 4rem 0 6rem;
  }

  .page-about .about-hero h1 {
    font-size: clamp(2.5rem, 5vw, 4.25rem);
    max-width: 1100px;
  }

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

  .page-about .about-chapter__grid {
    grid-template-columns: 220px 1fr;
    gap: 4rem;
    align-items: start;
  }

  .page-about .about-chapter__rail {
    position: sticky;
    top: 2rem;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    border-bottom: none;
    border-left: 4px solid var(--color-blue);
    margin: 0;
    padding: 0 0 2rem 1.5rem;
    height: 100%;
  }

  .page-about .about-chapter__name {
    writing-mode: vertical-rl;
    margin: 1rem 0 0;
    padding-left: 0.25rem;
  }

  .page-about .about-chapter__body {
    padding-top: 0;
  }

  .page-about .about-chapter__title {
    font-size: clamp(1.75rem, 2.6vw, 2.875rem);
  }

  /* 时间轴桌面版 */
  .page-about .about-timeline {
    margin-top: 4rem;
  }

  .page-about .about-timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--color-line);
    transform: translateX(-50%);
  }

  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 1fr 3rem 1fr;
    width: 100%;
    padding: 0 0 3.5rem;
    margin: 0;
  }

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

  .page-about .about-timeline__item:last-child {
    padding-bottom: 0;
  }

  .page-about .about-timeline__marker {
    position: static;
    grid-column: 2;
    grid-row: 1;
    justify-self: center;
    align-self: start;
    margin-top: 2rem;
  }

  .page-about .about-timeline__year {
    grid-row: 1;
    align-self: start;
  }

  .page-about .about-timeline__card {
    grid-row: 1;
  }

  .page-about .about-timeline__item:nth-child(odd) .about-timeline__year {
    grid-column: 3;
    text-align: left;
    margin-left: 2.5rem;
    justify-self: start;
  }

  .page-about .about-timeline__item:nth-child(odd) .about-timeline__card {
    grid-column: 1;
    text-align: right;
    margin-right: 2.5rem;
  }

  .page-about .about-timeline__item:nth-child(even) .about-timeline__year {
    grid-column: 1;
    text-align: right;
    margin-right: 2.5rem;
    justify-self: end;
  }

  .page-about .about-timeline__item:nth-child(even) .about-timeline__card {
    grid-column: 3;
    text-align: left;
    margin-left: 2.5rem;
  }

  /* 统计面板桌面版 */
  .page-about .about-stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }

  /* 图文简介桌面版 */
  .page-about .about-chapter__intro {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }

  .page-about .about-chapter__intro--reversed .about-figure {
    order: 1;
  }

  .page-about .about-chapter__intro--reversed .about-chapter__intro-copy {
    order: 2;
  }

  /* 团队能力桌面版 */
  .page-about .about-team__capabilities {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }

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

  .page-about .about-team__fact {
    border-bottom: none;
  }

  .page-about .about-team__fact:nth-child(2n) {
    border-right: 3px solid var(--color-blue);
  }

  .page-about .about-team__fact:nth-child(n+3) {
    border-bottom: none;
  }

  .page-about .about-team__fact:last-child {
    border-right: none;
  }

  /* 合规桌面版 */
  .page-about .about-compliance__grid {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 2rem;
  }

  .page-about .about-compliance__factline {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }

  /* 底部续览 */
  .page-about .about-next {
    padding: 6rem 0 7rem;
  }

  .page-about .about-next__grid {
    gap: 1.25rem;
  }
}