.page-about {
  background: var(--color-navy);
  color: var(--color-paper);
  --about-sidebar-width: 248px;
}

.page-about .about-shell {
  display: flex;
  min-height: 100vh;
  width: 100%;
}

/* ===== 左侧章节索引栏 ===== */
.page-about .about-sidebar {
  width: var(--about-sidebar-width);
  flex-shrink: 0;
  background: var(--color-navy-deep);
  border-right: 1px solid rgba(255,255,255,0.08);
  position: sticky;
  top: 0;
  height: 100vh;
  z-index: 10;
}

.page-about .about-sidebar__inner {
  display: flex;
  flex-direction: column;
  padding: 28px 20px 20px;
  height: 100%;
}

.page-about .about-sidebar__head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 8px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  margin-bottom: 20px;
}

.page-about .about-sidebar__mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--color-accent);
  color: var(--color-white);
  font-size: 20px;
  font-weight: 900;
  border-radius: var(--radius);
  font-family: var(--font-sans);
}

.page-about .about-sidebar__caption {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.72);
  line-height: 1.3;
}

.page-about .about-sidebar__link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 12px;
  color: rgba(255,255,255,0.58);
  text-decoration: none;
  border-radius: var(--radius);
  transition: background-color 0.18s ease, color 0.18s ease;
  scroll-margin-top: 24px;
}

.page-about .about-sidebar__link:hover,
.page-about .about-sidebar__link:focus-visible {
  background: rgba(255,255,255,0.06);
  color: var(--color-paper);
}

.page-about .about-sidebar__link.is-active {
  color: var(--color-accent);
  background: linear-gradient(90deg, rgba(255,107,53,0.14), transparent);
}

.page-about .about-sidebar__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-gold);
  min-width: 18px;
}

.page-about .about-sidebar__label {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.page-about .about-sidebar__foot {
  margin-top: auto;
  padding: 16px 8px 0;
  border-top: 1px solid rgba(255,255,255,0.1);
}

.page-about .about-sidebar__foot .btn {
  width: 100%;
}

.page-about .about-main {
  flex: 1;
  min-width: 0;
  max-width: calc(100% - var(--about-sidebar-width));
}

/* ===== 首屏品牌概述 ===== */
.page-about .about-intro {
  position: relative;
  padding: 84px 64px 72px;
  background: var(--color-navy);
  overflow: hidden;
}

.page-about .about-intro::before {
  content: "";
  position: absolute;
  top: -55%;
  right: -10%;
  width: 50%;
  height: 210%;
  background: var(--color-accent);
  clip-path: polygon(100% 0, 100% 100%, 38% 100%);
  opacity: 0.12;
  pointer-events: none;
}

.page-about .about-intro::after {
  content: "";
  position: absolute;
  top: 0;
  right: 8%;
  width: 1px;
  height: 100%;
  background: rgba(255,255,255,0.1);
  pointer-events: none;
}

.page-about .about-intro .breadcrumb {
  margin-bottom: 40px;
  position: relative;
  z-index: 1;
  font-size: 13px;
}

.page-about .about-intro__content {
  max-width: 720px;
  position: relative;
  z-index: 1;
}

.page-about .about-intro__lead {
  font-size: 20px;
  line-height: 1.75;
  font-weight: 400;
  color: rgba(255,255,255,0.92);
  margin: 16px 0 0;
  max-width: 640px;
}

.page-about .about-intro__sub {
  font-size: 16px;
  line-height: 1.8;
  color: rgba(245,245,240,0.78);
  margin: 20px 0 0;
  max-width: 560px;
}

.page-about .about-intro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
}

.page-about .about-intro__quote {
  position: absolute;
  right: 56px;
  bottom: 56px;
  width: 300px;
  padding: 20px 24px;
  border-left: 3px solid var(--color-gold);
  background: rgba(255,255,255,0.04);
  z-index: 1;
}

.page-about .about-intro__quote blockquote {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(245,245,240,0.85);
}

/* ===== 章节通用头部 ===== */
.page-about .about-section-head {
  margin-bottom: 44px;
}

.page-about .about-section-head .section-title {
  margin-top: 6px;
}

.page-about .about-section-head p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-gray);
  max-width: 620px;
  margin-top: 12px;
}

.page-about .about-data .about-section-head p,
.page-about .about-team .about-section-head p {
  color: rgba(245,245,240,0.68);
}

.page-about .about-data .section-kicker,
.page-about .about-team .section-kicker {
  color: var(--color-accent);
}

/* ===== 发展历程 ===== */
.page-about .about-milestones {
  background: var(--color-paper);
  color: var(--color-gray);
  padding: 88px 64px 72px;
}

.page-about .about-timeline {
  position: relative;
  margin-top: 20px;
  padding-left: 32px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-line), rgba(224,224,224,0.2));
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 108px 1fr;
  gap: 28px;
  padding-bottom: 52px;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 12px;
}

.page-about .about-timeline__mark {
  position: absolute;
  left: -32px;
  top: 2px;
  width: 12px;
  height: 12px;
  border-radius: 2px;
  background: var(--color-gold);
  transform: rotate(45deg);
  box-shadow: 0 0 0 4px rgba(255,215,0,0.18);
  z-index: 1;
}

.page-about .about-timeline__meta time {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--color-navy);
  letter-spacing: 0.02em;
}

.page-about .about-timeline__card {
  background: var(--color-white);
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius);
  padding: 20px 26px;
  box-shadow: var(--shadow);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.page-about .about-timeline__card:hover {
  transform: translateY(-2px);
  box-shadow: 0 2px 0 rgba(10,30,60,0.06), 0 12px 32px rgba(10,30,60,0.12);
}

.page-about .about-timeline__card h3 {
  font-size: 18px;
  font-weight: 800;
  color: var(--color-navy);
  margin: 0 0 8px;
}

.page-about .about-timeline__card p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-gray);
  margin: 0;
}

.page-about .about-milestones__media {
  margin-top: 56px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
  border-top: 1px solid var(--color-line);
  padding-top: 40px;
}

.page-about .about-milestones__media img {
  width: 100%;
  max-width: 500px;
  height: auto;
  object-fit: cover;
  border: 1px solid #D6D6CE;
  border-radius: var(--radius);
  background: #F0F0EA;
}

.page-about .about-milestones__caption {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-gray);
  max-width: 500px;
}

/* ===== 数据与技术 ===== */
.page-about .about-data {
  background: var(--color-navy);
  color: var(--color-paper);
  padding: 88px 64px 80px;
}

.page-about .about-data__metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 64px;
}

.page-about .about-stat {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: left;
  position: relative;
  overflow: hidden;
}

.page-about .about-stat::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-accent);
  opacity: 0.7;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  color: var(--color-gold);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  font-weight: 400;
  color: rgba(245,245,240,0.7);
  line-height: 1.5;
}

.page-about .about-data__detail {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: start;
}

.page-about .about-data__visual h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
  margin: 0 0 12px;
}

.page-about .about-data__visual p {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245,245,240,0.74);
  margin: 0 0 24px;
  max-width: 560px;
}

.page-about .about-data__chart {
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
  background: rgba(255,255,255,0.03);
}

.page-about .about-data__chart-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.page-about .about-data__chart-row:last-child {
  margin-bottom: 0;
}

.page-about .about-data__chart-label {
  font-size: 13px;
  font-weight: 600;
  color: rgba(245,245,240,0.85);
  min-width: 36px;
}

.page-about .about-data__chart-track {
  flex: 1;
  height: 24px;
  background: rgba(255,255,255,0.06);
  border-radius: 2px;
  overflow: hidden;
  display: flex;
  align-items: center;
}

.page-about .about-data__bar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  height: 24px;
  min-width: 44px;
  padding: 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--color-white);
  transition: filter 0.18s ease, transform 0.18s ease;
  border-radius: 2px 0 0 2px;
}

.page-about .about-data__bar:hover {
  filter: brightness(1.2);
  transform: scaleX(1.01);
  transform-origin: left;
}

.page-about .about-data__bar--home {
  background: linear-gradient(90deg, var(--color-navy), #1D3E6F);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.12);
}

.page-about .about-data__bar--away {
  background: linear-gradient(90deg, #CD4A1F, var(--color-accent));
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.14);
}

.page-about .about-data__visual img {
  width: 100%;
  max-width: 600px;
  height: auto;
  object-fit: cover;
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: var(--radius);
  background: rgba(255,255,255,0.03);
}

.page-about .about-data__fields {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-data__field {
  background: var(--color-navy);
  padding: 18px 20px;
}

.page-about .about-data__field-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin-bottom: 6px;
}

.page-about .about-data__field-value {
  display: block;
  font-size: 15px;
  font-weight: 500;
  color: rgba(245,245,240,0.9);
  line-height: 1.5;
}

/* ===== 品牌定位 ===== */
.page-about .about-position {
  background: var(--color-paper);
  color: var(--color-gray);
  padding: 88px 64px 80px;
}

.page-about .about-position__head {
  margin-bottom: 40px;
}

.page-about .about-position__head .section-title {
  margin-top: 6px;
}

.page-about .about-position__statement {
  font-size: 28px;
  font-weight: 800;
  line-height: 1.5;
  color: var(--color-navy);
  margin: 0 0 48px;
  max-width: 720px;
  border-left: 4px solid var(--color-accent);
  padding-left: 24px;
}

.page-about .about-position__principles {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.page-about .about-principle {
  background: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 28px 28px 24px;
  position: relative;
  box-shadow: 0 1px 0 rgba(10,30,60,0.03);
  transition: box-shadow 0.18s ease, transform 0.18s ease;
}

.page-about .about-principle:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.page-about .about-principle__num {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.06em;
  display: block;
  margin-bottom: 12px;
}

.page-about .about-principle h3 {
  font-size: 18px;
  font-weight: 800;
  color: var(--color-navy);
  margin: 0 0 10px;
}

.page-about .about-principle p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-gray);
  margin: 0;
}

/* ===== 团队与资质 ===== */
.page-about .about-team {
  background: var(--color-navy);
  color: var(--color-paper);
  padding: 88px 64px 72px;
  position: relative;
}

.page-about .about-team::before {
  content: "";
  position: absolute;
  bottom: 0;
  right: 0;
  width: 45%;
  height: 60%;
  background: var(--color-accent);
  clip-path: polygon(0 100%, 100% 100%, 100% 0);
  opacity: 0.05;
  pointer-events: none;
}

.page-about .about-team__head {
  margin-bottom: 48px;
}

.page-about .about-team__head .section-title--light {
  margin-top: 6px;
}

.page-about .about-team__body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
  position: relative;
  z-index: 1;
}

.page-about .about-team__stat {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 20px;
}

.page-about .about-team__stat-num {
  font-family: var(--font-mono);
  font-size: 56px;
  font-weight: 700;
  color: var(--color-gold);
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.page-about .about-team__stat-label {
  font-size: 16px;
  font-weight: 600;
  color: rgba(245,245,240,0.85);
  line-height: 1.4;
}

.page-about .about-team__text p {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245,245,240,0.72);
  margin: 0 0 28px;
  max-width: 460px;
}

.page-about .about-team__certs {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .about-cert {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 18px 20px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  transition: border-color 0.18s ease, background-color 0.18s ease;
}

.page-about .about-cert:hover {
  border-color: rgba(255,215,0,0.5);
  background: rgba(255,255,255,0.06);
}

.page-about .about-cert__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  color: var(--color-gold);
  background: rgba(255,215,0,0.1);
  border-radius: var(--radius);
}

.page-about .about-cert__name {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-white);
  display: block;
}

.page-about .about-cert__desc {
  font-size: 13px;
  color: rgba(245,245,240,0.6);
  display: block;
  margin-top: 2px;
}

.page-about .about-team__media {
  margin-top: 48px;
  position: relative;
  z-index: 1;
}

.page-about .about-team__media img {
  width: 100%;
  max-width: 400px;
  height: auto;
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: var(--radius);
  background: rgba(255,255,255,0.04);
}

/* ===== 底部 CTA ===== */
.page-about .about-cta {
  background: linear-gradient(135deg, var(--color-navy) 60%, #112847);
  color: var(--color-paper);
  padding: 88px 64px 96px;
  text-align: center;
  border-top: 1px solid rgba(255,255,255,0.08);
}

.page-about .about-cta__title {
  font-size: 32px;
  font-weight: 900;
  color: var(--color-white);
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}

.page-about .about-cta p {
  font-size: 16px;
  line-height: 1.7;
  color: rgba(245,245,240,0.75);
  margin: 0 auto 32px;
  max-width: 520px;
}

.page-about .about-cta__actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
}

/* ===== 锚点滚动余量 ===== */
.page-about section[id] {
  scroll-margin-top: 8px;
}

.page-about:target-within .about-sidebar__link {
  transition: none;
}

.page-about section[id]:target {
  scroll-margin-top: 8px;
}

/* ===== 响应式：中等屏幕 ===== */
@media (max-width: 1100px) {
  .page-about {
    --about-sidebar-width: 216px;
  }

  .page-about .about-intro {
    padding: 64px 40px 60px;
  }

  .page-about .about-milestones,
  .page-about .about-data,
  .page-about .about-position,
  .page-about .about-team,
  .page-about .about-cta {
    padding-left: 40px;
    padding-right: 40px;
  }

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

  .page-about .about-data__detail {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .page-about .about-data__fields {
    max-width: 600px;
  }

  .page-about .about-team__body {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .page-about .about-intro__quote {
    position: static;
    width: 100%;
    max-width: 520px;
    margin-top: 40px;
  }

  .page-about .about-intro__quote blockquote {
    font-size: 15px;
  }
}

/* ===== 响应式：平板 ===== */
@media (max-width: 900px) {
  .page-about .about-shell {
    display: block;
  }

  .page-about .about-sidebar {
    position: static;
    width: 100%;
    height: auto;
    border-right: none;
    border-bottom: 1px solid rgba(255,255,255,0.08);
  }

  .page-about .about-sidebar__inner {
    flex-direction: row;
    align-items: center;
    gap: 4px;
    padding: 12px 16px;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .page-about .about-sidebar__inner::-webkit-scrollbar {
    display: none;
  }

  .page-about .about-sidebar__head {
    padding: 0 12px 0 0;
    border-bottom: none;
    border-right: 1px solid rgba(255,255,255,0.1);
    margin-bottom: 0;
    margin-right: 12px;
    flex-shrink: 0;
  }

  .page-about .about-sidebar__mark {
    width: 32px;
    height: 32px;
    font-size: 16px;
  }

  .page-about .about-sidebar__caption {
    font-size: 12px;
    white-space: nowrap;
  }

  .page-about .about-sidebar__link {
    flex-shrink: 0;
    padding: 8px 12px;
  }

  .page-about .about-sidebar__label {
    font-size: 13px;
    white-space: nowrap;
  }

  .page-about .about-sidebar__foot {
    display: none;
  }

  .page-about .about-main {
    max-width: 100%;
  }

  .page-about .about-milestones,
  .page-about .about-data,
  .page-about .about-position,
  .page-about .about-team,
  .page-about .about-cta {
    padding-left: 24px;
    padding-right: 24px;
  }

  .page-about .about-intro {
    padding: 48px 24px 48px;
  }

  .page-about .about-timeline__item {
    grid-template-columns: 84px 1fr;
    gap: 20px;
  }

  .page-about .about-timeline__meta time {
    font-size: 16px;
  }

  .page-about .about-position__statement {
    font-size: 24px;
  }

  .page-about .about-position__principles {
    grid-template-columns: 1fr;
  }

  .page-about .about-team__certs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ===== 响应式：手机 ===== */
@media (max-width: 600px) {
  .page-about .about-intro {
    padding: 36px 18px 40px;
  }

  .page-about .about-intro__lead {
    font-size: 17px;
  }

  .page-about .about-intro__sub {
    font-size: 15px;
  }

  .page-about .about-intro .breadcrumb {
    margin-bottom: 28px;
    font-size: 12px;
  }

  .page-about .about-milestones,
  .page-about .about-data,
  .page-about .about-position,
  .page-about .about-team,
  .page-about .about-cta {
    padding-left: 18px;
    padding-right: 18px;
    padding-top: 56px;
    padding-bottom: 56px;
  }

  .page-about .about-timeline {
    padding-left: 24px;
  }

  .page-about .about-timeline::before {
    left: 5px;
  }

  .page-about .about-timeline__item {
    display: block;
    padding-bottom: 36px;
  }

  .page-about .about-timeline__mark {
    left: -24px;
    top: 2px;
  }

  .page-about .about-timeline__meta {
    margin-bottom: 8px;
  }

  .page-about .about-timeline__meta time {
    font-size: 15px;
  }

  .page-about .about-timeline__card {
    padding: 16px 18px;
  }

  .page-about .about-timeline__card h3 {
    font-size: 16px;
  }

  .page-about .about-timeline__card p {
    font-size: 13px;
  }

  .page-about .about-milestones__media {
    margin-top: 36px;
    padding-top: 28px;
  }

  .page-about .about-data__metrics {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 40px;
  }

  .page-about .about-stat {
    padding: 18px 14px;
  }

  .page-about .about-stat__num {
    font-size: 24px;
  }

  .page-about .about-stat__label {
    font-size: 12px;
  }

  .page-about .about-data__visual h3 {
    font-size: 18px;
  }

  .page-about .about-data__visual p {
    font-size: 14px;
  }

  .page-about .about-data__chart {
    padding: 14px;
  }

  .page-about .about-data__chart-label {
    min-width: 30px;
    font-size: 12px;
  }

  .page-about .about-data__bar {
    font-size: 11px;
    min-width: 36px;
    padding: 0 8px;
  }

  .page-about .about-data__field {
    padding: 14px 16px;
  }

  .page-about .about-position__statement {
    font-size: 20px;
    padding-left: 16px;
    margin-bottom: 36px;
  }

  .page-about .about-principle {
    padding: 22px 20px 20px;
  }

  .page-about .about-team__stat {
    flex-direction: column;
    gap: 6px;
    align-items: flex-start;
  }

  .page-about .about-team__stat-num {
    font-size: 42px;
  }

  .page-about .about-team__stat-label {
    font-size: 14px;
  }

  .page-about .about-team__certs {
    display: flex;
    flex-direction: column;
    gap: 12px;
  }

  .page-about .about-cert {
    padding: 14px 16px;
  }

  .page-about .about-cta__title {
    font-size: 24px;
  }

  .page-about .about-cta p {
    font-size: 14px;
  }
}