/* ==========================================================
   page-about — 品牌档案
   页面专属样式，限定在 .page-about 作用域内
   ========================================================== */
.page-about {
  --about-gold-line: rgba(212, 175, 55, 0.32);
  --about-gold-soft: rgba(212, 175, 55, 0.1);
  --about-white-85: rgba(244, 246, 248, 0.85);
  --about-navy-rgb: 10, 27, 42;
  background-color: var(--c-light);
  color: var(--c-dark);
}

/* ---------- 面包屑（深色 hero 内） ---------- */
.page-about .about-hero .breadcrumbs {
  position: relative;
  z-index: 2;
  margin-bottom: 48px;
}

.page-about .about-hero .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.page-about .about-hero .breadcrumbs__link {
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 500;
  color: var(--about-white-85);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .about-hero .breadcrumbs__link:hover {
  color: var(--c-gold);
}

.page-about .about-hero .breadcrumbs__current {
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 600;
  color: var(--c-gold);
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background-color: var(--c-navy);
  background-image:
    linear-gradient(rgba(212, 175, 55, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(212, 175, 55, 0.045) 1px, transparent 1px);
  background-size: 40px 40px;
  padding-top: 24px;
  padding-bottom: 80px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -120px;
  right: -80px;
  width: 360px;
  height: 420px;
  background: linear-gradient(135deg, transparent 40%, rgba(212, 175, 55, 0.28) 41%, rgba(212, 175, 55, 0.1) 68%, transparent 69%);
  clip-path: polygon(18% 0, 100% 0, 86% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  bottom: -72px;
  left: -72px;
  width: 220px;
  height: 220px;
  border: 2px solid var(--about-gold-line);
  transform: rotate(45deg);
  pointer-events: none;
  opacity: 0.5;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 40px;
}

.page-about .about-hero__content {
  max-width: 680px;
}

.page-about .about-hero__eyebrow {
  display: inline-block;
  margin-bottom: 18px;
  padding: 6px 12px;
  border: 1px solid var(--about-gold-line);
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--c-gold);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-size: 32px;
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--c-white);
  margin: 0 0 18px;
}

.page-about .about-hero__lead {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  color: var(--about-white-85);
  margin: 0 0 32px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-hero__stats {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.page-about .about-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 18px;
  background-color: var(--c-navy);
}

.page-about .about-hero__stat-value {
  font-family: var(--font-head);
  font-size: 28px;
  font-weight: 900;
  line-height: 1;
  color: var(--c-gold);
}

.page-about .about-hero__stat-name {
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 600;
  color: var(--about-white-85);
  letter-spacing: 0.04em;
}

/* ---------- 品牌简介 ---------- */
.page-about .about-intro__grid {
  display: grid;
  gap: 36px;
  align-items: center;
}

.page-about .about-intro__media {
  position: relative;
}

.page-about .about-intro__image,
.page-about .about-cert__image,
.page-about .about-team__image {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-intro__image {
  aspect-ratio: 2 / 1;
}

.page-about .about-cert__image {
  aspect-ratio: 4 / 5;
}

.page-about .about-team__image {
  aspect-ratio: 3 / 2;
}

.page-about .about-intro__caption,
.page-about .about-cert__figcaption,
.page-about .about-team__figcaption {
  margin-top: 10px;
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-dark);
  opacity: 0.75;
}

.page-about .about-intro__text {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.9;
  color: var(--c-dark);
  margin: 0 0 18px;
}

.page-about .about-intro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 24px;
}

/* ---------- 发展里程碑 ---------- */
.page-about .about-timeline__track {
  position: relative;
  list-style: none;
  margin: 0;
  padding-left: 40px;
}

.page-about .about-timeline__track::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: linear-gradient(
    to bottom,
    transparent,
    rgba(212, 175, 55, 0.45) 10%,
    rgba(212, 175, 55, 0.45) 90%,
    transparent
  );
}

.page-about .about-timeline__item {
  position: relative;
  margin-bottom: 32px;
}

.page-about .about-timeline__dot {
  position: absolute;
  left: 0;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--c-gold);
  border: 3px solid var(--c-light);
  box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.2);
}

.page-about .about-timeline__head {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  margin-bottom: 12px;
}

.page-about .about-timeline__year {
  font-family: var(--font-head);
  font-size: 36px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--c-gold-deep);
}

.page-about .about-timeline__hint {
  margin-top: 6px;
  font-family: var(--font-head);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-dark);
  opacity: 0.8;
}

.page-about .about-timeline__panel {
  background-color: var(--c-white);
  border-left: 3px solid var(--c-gold);
  padding: 20px 20px 24px;
  box-shadow: 0 2px 10px rgba(var(--about-navy-rgb), 0.06);
}

.page-about .about-timeline__title {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 900;
  color: var(--c-navy);
  margin: 0 0 8px;
}

.page-about .about-timeline__text {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-dark);
  margin: 0;
}

/* ---------- 资质与认证 ---------- */
.page-about .about-cert .section-heading__title,
.page-about .about-cert .section-heading__subtitle {
  color: var(--c-white);
}

.page-about .about-cert .section-heading__index {
  color: var(--c-gold);
}

.page-about .about-cert__layout {
  display: grid;
  gap: 40px;
}

.page-about .about-cert__wall {
  display: grid;
  gap: 24px;
}

.page-about .about-cert__card {
  appearance: none;
  -webkit-appearance: none;
  display: block;
  width: 100%;
  padding: 0;
  border: none;
  background: transparent;
  font: inherit;
  color: inherit;
  text-align: left;
  cursor: pointer;
  perspective: 1000px;
}

.page-about .about-cert__inner {
  position: relative;
  display: block;
  width: 100%;
  min-height: 240px;
  transition: transform 0.6s var(--ease);
  transform-style: preserve-3d;
}

.page-about .about-cert__card:hover .about-cert__inner,
.page-about .about-cert__card:focus .about-cert__inner,
.page-about .about-cert__card:focus-visible .about-cert__inner {
  transform: rotateY(180deg);
}

.page-about .about-cert__front,
.page-about .about-cert__back {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 28px 22px;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.page-about .about-cert__front {
  background-color: var(--c-blue);
  background-image: linear-gradient(135deg, rgba(212, 175, 55, 0.08), transparent 60%);
  border: 1px solid var(--about-gold-line);
  color: var(--c-white);
}

.page-about .about-cert__back {
  background-color: var(--c-gold);
  color: var(--c-navy);
  transform: rotateY(180deg);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.8;
  text-align: left;
}

.page-about .about-cert__badge {
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.08em;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-navy);
  background-color: var(--c-gold);
  margin-bottom: 16px;
}

.page-about .about-cert__name {
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 900;
  line-height: 1.3;
  text-align: center;
  margin: 0 0 8px;
  color: var(--c-white);
}

.page-about .about-cert__scope {
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 600;
  text-align: center;
  color: var(--about-white-85);
}

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

.page-about .about-cert__figcaption {
  color: var(--about-white-85);
}

/* ---------- 团队与生态 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 40px;
  align-items: center;
}

.page-about .about-team__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background-color: var(--c-gray);
  border: 1px solid var(--c-gray);
  margin-bottom: 24px;
}

.page-about .about-team__stat {
  background-color: var(--c-white);
  padding: 20px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-team__stat-num {
  font-family: var(--font-head);
  font-size: 26px;
  font-weight: 900;
  line-height: 1;
  color: var(--c-gold-deep);
}

.page-about .about-team__stat-label {
  font-family: var(--font-head);
  font-size: 12px;
  font-weight: 600;
  color: var(--c-dark);
}

.page-about .about-team__intro {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.9;
  color: var(--c-dark);
  margin: 0 0 22px;
}

.page-about .about-team__list {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-team__item {
  position: relative;
  padding-left: 20px;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-dark);
}

.page-about .about-team__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.8em;
  width: 8px;
  height: 8px;
  background-color: var(--c-orange);
}

.page-about .about-team__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

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

/* ---------- 桌面端布局 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero {
    padding-top: 40px;
    padding-bottom: 96px;
  }

  .page-about .about-hero .breadcrumbs {
    margin-bottom: 72px;
  }

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

  .page-about .about-hero__title {
    font-size: 52px;
    line-height: 1.12;
  }

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

  .page-about .about-hero__stats {
    transform: translateY(24px);
  }

  .page-about .about-hero__stat {
    padding: 28px 22px;
  }

  .page-about .about-hero__stat-value {
    font-size: 34px;
  }

  /* 品牌简介：图文错位 */
  .page-about .about-intro__grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 64px;
  }

  .page-about .about-intro__media {
    margin-left: -40px;
  }

  /* 时间线：横向主轴 */
  .page-about .about-timeline__track {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--gap);
    padding-left: 0;
  }

  .page-about .about-timeline__track::before {
    left: 2%;
    right: 2%;
    top: 66px;
    bottom: auto;
    width: auto;
    height: 2px;
    background: linear-gradient(
      to right,
      transparent,
      rgba(212, 175, 55, 0.45) 12%,
      rgba(212, 175, 55, 0.45) 88%,
      transparent
    );
  }

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

  .page-about .about-timeline__head {
    height: 82px;
    align-items: center;
    text-align: center;
    justify-content: flex-start;
    margin-bottom: 18px;
  }

  .page-about .about-timeline__year {
    font-size: 34px;
    margin-bottom: 4px;
  }

  .page-about .about-timeline__hint {
    opacity: 0;
    transform: translateY(4px);
    transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
  }

  .page-about .about-timeline__item:hover .about-timeline__hint,
  .page-about .about-timeline__item:focus-within .about-timeline__hint {
    opacity: 1;
    transform: translateY(0);
  }

  .page-about .about-timeline__dot {
    left: 50%;
    top: 59px;
    transform: translateX(-50%);
  }

  .page-about .about-timeline__panel {
    min-height: 210px;
  }

  /* 资质：卡片墙 + 竖图 */
  .page-about .about-cert__layout {
    grid-template-columns: minmax(0, 1fr) 340px;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-cert__wall {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  .page-about .about-cert__inner {
    min-height: 280px;
  }

  .page-about .about-cert__figure {
    position: sticky;
    top: 96px;
  }

  /* 团队：内容与图分隔 */
  .page-about .about-team__grid {
    grid-template-columns: 1fr 0.9fr;
    gap: 64px;
    align-items: center;
  }

  .page-about .about-team__stats .about-team__stat {
    padding: 24px 16px;
  }
}