.page-about {
  --about-accent: var(--c-accent);
  --about-accent-soft: var(--c-accent-soft);
  --about-deep: var(--c-primary);
  --about-panel: var(--c-panel);
  --about-line: var(--c-line);
  --about-muted: var(--c-muted);
  --about-light: var(--c-light);
  --about-success: var(--c-success);
  --about-font-head: var(--font-head);
  --about-font-num: var(--font-num);
  background-color: var(--about-light);
  overflow-x: hidden;
}

/* ===== Hero 区域 ===== */
.page-about .about-hero {
  background: linear-gradient(120deg, var(--about-deep) 0%, var(--about-panel) 58%, var(--about-accent) 58.2%, rgba(10, 25, 48, 0.98) 58.4%);
  padding: 48px 0 64px;
  position: relative;
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 42%;
  height: 100%;
  background: repeating-linear-gradient(-45deg, transparent 0 18px, rgba(255, 255, 255, 0.035) 18px 20px);
  pointer-events: none;
}

.page-about .about-hero__inner {
  display: flex;
  flex-direction: column;
  gap: 32px;
  position: relative;
  z-index: 1;
}

.page-about .about-hero__letters {
  display: flex;
  gap: 4px;
}

.page-about .about-hero__letters span {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--about-font-head);
  font-weight: 900;
  font-size: clamp(44px, 9vw, 96px);
  line-height: 1;
  width: clamp(48px, 9vw, 96px);
  height: clamp(48px, 9vw, 96px);
  color: var(--about-light);
  background: var(--about-panel);
  clip-path: polygon(0 0, 100% 0, 88% 100%, 0 100%);
  letter-spacing: -2px;
}

.page-about .about-hero__letters span:nth-child(1) {
  background: var(--about-accent);
  color: var(--about-deep);
}

.page-about .about-hero__letters span:nth-child(2) {
  background: var(--about-panel);
  color: var(--about-accent);
}

.page-about .about-hero__letters span:nth-child(3) {
  background: var(--about-light);
  color: var(--about-deep);
}

.page-about .about-hero__letters span:nth-child(4) {
  background: var(--about-accent-soft);
  color: var(--about-deep);
}

.page-about .about-hero__letters span:nth-child(5) {
  background: var(--about-panel);
  color: var(--about-light);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 12% 100%);
}

.page-about .about-hero__content {
  max-width: 780px;
}

.page-about .about-hero__kicker {
  display: inline-block;
  font-family: var(--about-font-head);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 4px;
  color: var(--about-accent);
  text-transform: uppercase;
  margin: 0 0 12px;
  padding: 4px 12px;
  border-left: 3px solid var(--about-accent);
}

.page-about .about-hero h1 {
  font-family: var(--about-font-head);
  font-size: clamp(28px, 4.6vw, 48px);
  font-weight: 900;
  line-height: 1.2;
  color: var(--about-light);
  margin: 0 0 20px;
  letter-spacing: 0.5px;
}

.page-about .about-hero__lead {
  max-width: 620px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-muted);
  margin: 0;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 24px;
}

.page-about .about-hero .breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 0;
  margin: 0;
  font-size: 14px;
}

.page-about .about-hero .breadcrumb li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--about-line);
}

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

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

.page-about .about-hero .breadcrumb li:last-child {
  color: var(--about-accent);
}

/* ===== 品牌溯源 ===== */
.page-about .about-origin {
  padding: 64px 0;
  background: var(--about-light);
}

.page-about .about-origin__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-about .about-origin__copy h2,
.page-about .about-data__header h2,
.page-about .about-team h2,
.page-about .about-timeline h2 {
  font-family: var(--about-font-head);
  font-size: clamp(26px, 3.6vw, 38px);
  font-weight: 900;
  line-height: 1.3;
  color: var(--about-deep);
  margin: 0 0 20px;
}

.page-about .about-origin__copy p,
.page-about .about-data__header p,
.page-about .about-team__intro,
.page-about .about-timeline__intro {
  font-size: 15px;
  line-height: 1.8;
  color: #54657e;
  margin: 0 0 16px;
}

.page-about .about-origin__highlight {
  border-left: 4px solid var(--about-accent);
  padding: 12px 16px;
  background: rgba(255, 107, 53, 0.07);
  border-radius: 0 8px 8px 0;
}

.page-about .about-origin__facts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.page-about .about-origin__fact {
  background: var(--about-panel);
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  clip-path: polygon(0 0, 100% 0, 94% 100%, 0 100%);
  transition: transform 0.2s ease, background 0.2s ease;
}

.page-about .about-origin__fact:hover {
  transform: translateY(-4px);
  background: var(--about-deep);
}

.page-about .about-origin__num {
  font-family: var(--about-font-num);
  font-size: 30px;
  font-weight: 700;
  color: var(--about-accent);
  line-height: 1;
}

.page-about .about-origin__label {
  font-size: 13px;
  color: var(--about-muted);
  letter-spacing: 1px;
}

.page-about .about-origin .btn {
  margin-top: 8px;
  display: inline-block;
}

/* ===== 时间轴 ===== */
.page-about .about-timeline {
  background-color: var(--about-deep);
  background-image: repeating-linear-gradient(-45deg, transparent 0 24px, rgba(255, 255, 255, 0.028) 24px 26px);
  padding: 72px 0;
  color: var(--about-light);
}

.page-about .about-timeline h2 {
  color: var(--about-light);
}

.page-about .about-timeline__intro {
  color: var(--about-muted);
  max-width: 640px;
}

.page-about .about-timeline__wrap {
  position: relative;
  margin-top: 48px;
}

.page-about .about-timeline__line {
  position: absolute;
  left: 20px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--about-accent), var(--about-line) 55%, var(--about-success));
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 56px;
  margin-bottom: 40px;
}

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

.page-about .about-timeline__year {
  position: absolute;
  left: 0;
  top: 4px;
  width: 44px;
  text-align: center;
  font-family: var(--about-font-num);
  font-size: 18px;
  font-weight: 700;
  color: var(--about-accent);
  line-height: 44px;
  border: 2px solid var(--about-accent);
  border-radius: 50%;
  background: var(--about-deep);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.18);
}

.page-about .about-timeline__card {
  background: var(--about-panel);
  clip-path: polygon(0 0, 100% 0, 98% 100%, 2% 100%);
  overflow: hidden;
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.page-about .about-timeline__card:hover {
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
  transform: translateY(-3px);
}

.page-about .about-timeline__media {
  overflow: hidden;
}

.page-about .about-timeline__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  transition: transform 0.35s ease;
}

.page-about .about-timeline__card:hover .about-timeline__media img {
  transform: scale(1.03);
}

.page-about .about-timeline__body {
  padding: 22px 24px 26px;
}

.page-about .about-timeline__body .tag-chip {
  margin-bottom: 12px;
}

.page-about .about-timeline__body h3 {
  font-family: var(--about-font-head);
  font-size: 19px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--about-light);
  margin: 0 0 12px;
}

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

/* ===== 数据校验 ===== */
.page-about .about-data {
  padding: 72px 0;
  background: var(--about-light);
}

.page-about .about-data__header {
  max-width: 780px;
}

.page-about .about-data__header h2,
.page-about .about-data__header p {
  margin-bottom: 20px;
}

.page-about .about-data__steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 44px;
}

.page-about .about-data__step {
  position: relative;
  background: #ffffff;
  border: 1px solid #e5eaf0;
  border-left: 4px solid var(--about-accent);
  border-radius: 4px;
  padding: 28px 24px 24px 28px;
  transition: box-shadow 0.2s ease, border-left-width 0.2s ease;
}

.page-about .about-data__step:hover {
  border-left-width: 6px;
  box-shadow: 0 10px 26px rgba(10, 25, 48, 0.08);
}

.page-about .about-data__step-num {
  display: block;
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--about-accent);
  margin-bottom: 14px;
}

.page-about .about-data__step h3 {
  font-family: var(--about-font-head);
  font-size: 17px;
  font-weight: 800;
  color: var(--about-deep);
  margin: 0 0 10px;
}

.page-about .about-data__step p {
  font-size: 14px;
  line-height: 1.7;
  color: #5d6f88;
  margin: 0;
}

.page-about .about-data__bottom {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  margin-top: 56px;
  align-items: end;
}

.page-about .about-data__coverage {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-data__coverage-item {
  background: var(--about-panel);
  color: var(--about-light);
  padding: 24px;
  clip-path: polygon(0 0, 100% 0, 92% 100%, 0 100%);
}

.page-about .about-data__coverage-num {
  display: block;
  font-size: 42px;
  font-weight: 700;
  line-height: 1;
  color: var(--about-accent);
  margin-bottom: 8px;
}

.page-about .about-data__coverage-label {
  display: block;
  font-family: var(--about-font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--about-light);
  margin-bottom: 12px;
}

.page-about .about-data__coverage-item p {
  font-size: 13px;
  line-height: 1.65;
  color: var(--about-muted);
  margin: 0;
}

.page-about .about-data__chart {
  background: #ffffff;
  border: 1px solid #e5eaf0;
  border-radius: 6px;
  padding: 20px;
}

.page-about .about-data__chart svg {
  display: block;
  width: 100%;
  height: auto;
  max-height: 260px;
}

.page-about .about-data__chart circle {
  cursor: pointer;
  transition: r 0.2s ease;
}

.page-about .about-data__chart circle:hover {
  r: 10;
}

/* ===== 团队介绍 ===== */
.page-about .about-team {
  background-color: var(--about-deep);
  background-image: linear-gradient(160deg, transparent 60%, rgba(255, 107, 53, 0.05) 60.3%);
  padding: 72px 0;
  color: var(--about-light);
}

.page-about .about-team h2 {
  color: var(--about-light);
}

.page-about .about-team__intro {
  color: var(--about-muted);
  max-width: 720px;
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 44px;
}

.page-about .about-team__card {
  background: var(--about-panel);
  padding: 28px 24px;
  clip-path: polygon(2% 0, 100% 0, 98% 100%, 0 100%);
  border: 1px solid var(--about-line);
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.page-about .about-team__card:hover {
  border-color: var(--about-accent);
  transform: translateY(-4px);
}

.page-about .about-team__card-symbol {
  display: block;
  font-size: 22px;
  color: var(--about-accent);
  margin-bottom: 14px;
  line-height: 1;
}

.page-about .about-team__card h3 {
  font-family: var(--about-font-head);
  font-size: 17px;
  font-weight: 800;
  color: var(--about-light);
  margin: 0 0 12px;
}

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

.page-about .about-team__media {
  margin-top: 48px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  align-items: center;
  background: var(--about-panel);
  clip-path: polygon(0 0, 100% 0, 98% 100%, 0 94%);
  padding: 0 0 24px;
}

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

.page-about .about-team__caption {
  padding: 0 24px 8px;
}

.page-about .about-team__caption p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-muted);
  margin: 0 0 16px;
}

.page-about .about-team .btn--outline {
  border: 2px solid var(--about-accent);
  color: var(--about-accent);
  background: transparent;
  padding: 10px 22px;
  font-weight: 700;
  text-decoration: none;
  display: inline-block;
  transition: background 0.2s ease, color 0.2s ease;
}

.page-about .about-team .btn--outline:hover {
  background: var(--about-accent);
  color: var(--about-deep);
}

/* ===== 底部导航 ===== */
.page-about .about-next {
  background: var(--about-light);
  padding: 56px 0;
}

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

.page-about .about-next__item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: #ffffff;
  border: 1px solid #e5eaf0;
  padding: 28px 24px;
  border-radius: 4px;
  flex-wrap: wrap;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-next__item:hover {
  border-color: var(--about-accent);
  box-shadow: 0 8px 24px rgba(10, 25, 48, 0.07);
}

.page-about .about-next__index {
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--about-accent);
}

.page-about .about-next__item h3 {
  font-family: var(--about-font-head);
  font-size: 17px;
  font-weight: 800;
  color: var(--about-deep);
  margin: 0 0 6px;
}

.page-about .about-next__item p {
  font-size: 14px;
  color: #5d6f88;
  margin: 0;
  line-height: 1.6;
}

.page-about .about-next__item a:last-child {
  margin-left: auto;
  font-weight: 700;
  font-size: 14px;
  color: var(--about-accent);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease;
  padding-bottom: 2px;
}

.page-about .about-next__item a:last-child:hover {
  border-color: var(--about-accent);
}

/* ===== 共享按钮微调 ===== */
.page-about .btn--dark {
  background: var(--about-deep);
  color: var(--about-light);
  padding: 12px 28px;
  text-decoration: none;
  font-weight: 700;
  font-size: 14px;
  border: 2px solid var(--about-deep);
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  display: inline-block;
}

.page-about .btn--dark:hover {
  background: var(--about-accent);
  border-color: var(--about-accent);
  color: var(--about-deep);
}

.page-about .section-kicker {
  display: inline-block;
  font-family: var(--about-font-head);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--about-accent);
  margin: 0 0 14px;
  border-left: 3px solid var(--about-accent);
  padding-left: 10px;
}

/* ===== 桌面端媒体查询 ===== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 72px 0 88px;
  }

  .page-about .about-hero__inner {
    flex-direction: row;
    align-items: center;
    gap: 48px;
  }

  .page-about .about-hero__letters {
    order: 2;
    flex-shrink: 0;
    gap: 8px;
  }

  .page-about .about-hero__letters span {
    width: clamp(64px, 7vw, 104px);
    height: clamp(64px, 7vw, 104px);
    font-size: clamp(52px, 6vw, 92px);
  }

  .page-about .about-hero__content {
    order: 1;
  }

  .page-about .about-origin {
    padding: 88px 0;
  }

  .page-about .about-origin__inner {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 56px;
    align-items: start;
  }

  .page-about .about-origin__facts {
    position: sticky;
    top: 120px;
  }

  .page-about .about-origin__fact {
    padding: 28px 20px;
  }

  .page-about .about-timeline {
    padding: 96px 0;
  }

  .page-about .about-timeline__wrap {
    padding-top: 8px;
  }

  .page-about .about-timeline__line {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about .about-timeline__item {
    width: 50%;
    padding-left: 0;
    padding-right: 56px;
    margin-bottom: 64px;
  }

  .page-about .about-timeline__item--right {
    margin-left: 50%;
    padding-left: 56px;
    padding-right: 0;
  }

  .page-about .about-timeline__year {
    left: auto;
    right: -22px;
    transform: translateX(50%);
  }

  .page-about .about-timeline__item--right .about-timeline__year {
    right: auto;
    left: -22px;
    transform: translateX(-50%);
  }

  .page-about .about-timeline__card {
    clip-path: polygon(0 0, 100% 0, 98% 100%, 2% 100%);
  }

  .page-about .about-data {
    padding: 96px 0;
  }

  .page-about .about-data__steps {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

  .page-about .about-data__bottom {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
  }

  .page-about .about-data__coverage {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }

  .page-about .about-team {
    padding: 96px 0;
  }

  .page-about .about-team__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .page-about .about-team__media {
    grid-template-columns: 1.1fr 0.9fr;
    padding: 0;
    clip-path: polygon(0 0, 100% 0, 99% 100%, 0 92%);
  }

  .page-about .about-team__media img {
    height: 100%;
    object-fit: cover;
  }

  .page-about .about-team__caption {
    padding: 36px 36px 32px;
  }

  .page-about .about-next {
    padding: 72px 0;
  }

  .page-about .about-next__inner {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-data__steps {
    grid-template-columns: repeat(4, 1fr);
  }

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

  .page-about .about-origin__inner {
    gap: 80px;
  }
}