/* ===== 品牌故事页专属样式 ===== */
.page-about {
  --about-block-gap: var(--sp-7);
  background: var(--c-bg);
  color: var(--c-text);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  padding-top: calc(var(--header-h) + var(--sp-4));
  margin-bottom: var(--sp-2);
}

.page-about a:not(.btn) {
  color: var(--c-yellow);
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: color var(--dur) var(--ease);
}

.page-about a:not(.btn):hover {
  color: var(--c-orange);
}

.page-about .btn {
  text-decoration: none;
}

/* ===== Hero ===== */
.page-about .about-hero {
  display: grid;
  gap: var(--sp-5);
  padding-top: var(--sp-4);
  padding-bottom: var(--sp-7);
}

.page-about .about-hero__content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-size: clamp(2.6rem, 7vw, 5rem);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.03em;
  margin: var(--sp-4) 0 var(--sp-4);
  text-wrap: balance;
}

.page-about .about-hero__lead {
  font-size: 1.125rem;
  line-height: 1.75;
  color: var(--c-light);
  max-width: 36em;
  margin-bottom: var(--sp-4);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2) var(--sp-4);
  margin-bottom: var(--sp-5);
}

.page-about .about-hero__figure {
  margin: 0;
}

.page-about .about-hero__img {
  width: 100%;
  height: auto;
  border-radius: 48px 16px 48px 16px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}

/* ===== 我们为什么存在 ===== */
.page-about .about-why__grid {
  display: grid;
  gap: var(--sp-5);
}

.page-about .about-why__heading {
  max-width: 320px;
}

.page-about .about-why__body .text-lg {
  font-size: 1.375rem;
  line-height: 1.6;
  color: var(--c-text);
}

.page-about .about-why__body p + p {
  margin-top: var(--sp-4);
}

.page-about .about-why__body .text-muted {
  color: var(--c-muted);
}

/* ===== 发展历程 ===== */
.page-about .about-timeline__list {
  list-style: none;
  margin: var(--sp-6) 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--c-yellow), var(--c-data));
  opacity: 0.35;
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 40px;
  padding-bottom: var(--sp-5);
}

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

.page-about .about-timeline__dot {
  position: absolute;
  left: 0;
  top: 14px;
  width: 14px;
  height: 14px;
  border-radius: var(--r-pill);
  background: var(--c-yellow);
  box-shadow: 0 0 0 4px rgba(255, 195, 0, 0.15);
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__dot {
  transform: scale(1.3);
  background: var(--c-orange);
}

.page-about .about-timeline__year {
  font-family: var(--font-data);
  font-weight: 700;
  font-size: clamp(2rem, 4vw, 2.8rem);
  line-height: 1;
  color: var(--c-yellow);
  display: block;
  margin-bottom: var(--sp-3);
}

.page-about .about-timeline__card {
  background: var(--c-brand);
  border-radius: var(--r-lg);
  padding: var(--sp-4);
  transition: background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__card {
  background: var(--c-data);
  transform: translateY(-2px);
}

.page-about .about-timeline__title {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0 0 var(--sp-2);
}

.page-about .about-timeline__text {
  color: var(--c-muted);
  line-height: 1.65;
  margin: 0;
}

.page-about .about-timeline__cta {
  margin-top: var(--sp-5);
  padding: var(--sp-4);
  border-radius: var(--r-md);
  background: rgba(29, 61, 111, 0.25);
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
}

.page-about .about-timeline__cta p {
  margin: 0;
  color: var(--c-light);
}

/* ===== 覆盖范围 ===== */
.page-about .about-coverage__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-4);
  margin-top: var(--sp-5);
}

.page-about .about-coverage__card {
  background: linear-gradient(135deg, var(--c-bg-2), var(--c-brand));
  border-radius: var(--r-lg);
  padding: var(--sp-5) var(--sp-3);
  text-align: center;
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-coverage__card:hover {
  background: linear-gradient(135deg, var(--c-data), var(--c-brand));
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

.page-about .about-coverage__num {
  font-family: var(--font-data);
  font-size: clamp(2.8rem, 7vw, 4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--c-yellow);
  display: block;
}

.page-about .about-coverage__label {
  display: inline-block;
  margin-top: var(--sp-2);
  color: var(--c-muted);
  font-size: 0.875rem;
}

.page-about .about-coverage__desc {
  margin-top: var(--sp-4);
  color: var(--c-light);
  line-height: 1.7;
}

.page-about .about-coverage__map {
  margin: var(--sp-5) 0 0;
}

.page-about .about-coverage__map img {
  width: 100%;
  height: auto;
  border-radius: var(--r-lg);
}

.page-about .about-coverage__caption {
  color: var(--c-muted);
  font-size: 0.75rem;
  margin-top: var(--sp-2);
}

/* ===== 数据原则 ===== */
.page-about .about-principles__grid {
  display: grid;
  gap: var(--sp-5);
}

.page-about .about-principles__lead {
  font-family: var(--font-head);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-light);
  margin: var(--sp-3) 0 var(--sp-4);
}

.page-about .about-principles__list {
  list-style: none;
  margin: 0 0 var(--sp-4);
  padding: 0;
}

.page-about .about-principles__item {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: var(--sp-3);
  padding: var(--sp-4) 0;
  border-bottom: 1px solid rgba(244, 246, 251, 0.08);
}

.page-about .about-principles__item:last-child {
  border-bottom: 0;
}

.page-about .about-principles__tag {
  font-weight: 700;
  color: var(--c-yellow);
}

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

.page-about .about-principles__note {
  color: var(--c-muted);
}

.page-about .about-principles__figure {
  margin: 0;
}

.page-about .about-principles__figure img {
  width: 100%;
  height: auto;
  border-radius: 16px 48px 16px 48px;
}

.page-about .about-principles__caption {
  color: var(--c-muted);
  font-size: 0.75rem;
  margin-top: var(--sp-2);
}

/* ===== 收尾 CTA ===== */
.page-about .about-final__inner {
  text-align: center;
  padding: var(--sp-7) var(--sp-4);
  border-radius: var(--r-lg);
  background: radial-gradient(circle at 30% 20%, rgba(29, 61, 111, 0.45), rgba(8, 18, 38, 1) 60%);
  border: 1px solid rgba(255, 195, 0, 0.18);
}

.page-about .about-final__title {
  font-family: var(--font-head);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  margin: var(--sp-3) 0 var(--sp-2);
}

.page-about .about-final__text {
  color: var(--c-muted);
  max-width: 40em;
  margin: 0 auto var(--sp-4);
  line-height: 1.7;
}

.page-about .about-final__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  justify-content: center;
}

/* ===== 平板及以上 ===== */
@media (min-width: 768px) {
  .page-about .about-hero {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
    padding-top: var(--sp-4);
  }

  .page-about .about-hero__title {
    font-size: clamp(3rem, 6vw, 5rem);
  }

  .page-about .about-hero__figure {
    justify-self: end;
    max-width: 480px;
  }

  .page-about .about-why__grid {
    grid-template-columns: 320px 1fr;
    gap: var(--sp-6);
  }

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

  .page-about .about-principles__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-7);
    align-items: center;
  }

  .page-about .about-timeline__cta {
    max-width: 880px;
  }
}

/* ===== 桌面端时间轴 ===== */
@media (min-width: 1024px) {
  .page-about .about-hero__lead {
    font-size: 1.25rem;
  }

  .page-about .about-timeline__list {
    padding-top: var(--sp-2);
  }

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

  .page-about .about-timeline__item {
    width: 50%;
    padding-left: 0;
    padding-right: var(--sp-6);
    padding-bottom: var(--sp-6);
  }

  .page-about .about-timeline__item:nth-child(even) {
    margin-left: 50%;
    padding-left: var(--sp-6);
    padding-right: 0;
  }

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

  .page-about .about-timeline__item:nth-child(even) .about-timeline__dot {
    right: auto;
    left: -7px;
  }

  .page-about .about-timeline__year {
    font-size: 2.8rem;
  }

  .page-about .about-timeline__cta {
    max-width: 880px;
    margin-left: auto;
    margin-right: auto;
  }
}