/* =====================================================
   页面专属CSS — about（品牌介绍）
   作用域：.page-about
   移动端优先 + 桌面媒体查询
   ===================================================== */
.page-about {
  --ab-clip-offset: 4rem;
  --ab-sidebar-ratio: 34%;
  --ab-gap: 2.5rem;
  --ab-card-min-height: 280px;
  display: block;
  width: 100%;
}

/* ---------- 品牌简介区 ---------- */
.page-about .ab-brand {
  position: relative;
  background-color: var(--color-primary-dark-green);
  color: var(--color-text-white);
  padding: 4rem 0 3rem;
  overflow: hidden;
  min-height: 380px;
  display: flex;
  align-items: center;
}

.page-about .ab-brand__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.page-about .ab-brand__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  opacity: 0.15;
}

.page-about .ab-brand__deco {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 80px;
  transform: translateY(10%);
}

.page-about .ab-brand__inner {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.page-about .ab-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-body);
  font-size: 0.8rem;
  color: var(--color-accent-dark-gold);
  margin-bottom: 1.25rem;
  opacity: 0.85;
}

.page-about .ab-breadcrumb a {
  color: var(--color-accent-dark-gold);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-speed);
}

.page-about .ab-breadcrumb a:hover,
.page-about .ab-breadcrumb a:focus-visible {
  border-bottom-color: var(--color-accent-neon-green);
}

.page-about .ab-breadcrumb__sep {
  color: var(--color-accent-neon-green);
  font-size: 0.7rem;
  opacity: 0.7;
}

.page-about .ab-brand__title {
  font-family: var(--font-heading);
  font-size: 2.6rem;
  font-weight: 900;
  line-height: 1.1;
  color: var(--color-accent-dark-gold);
  letter-spacing: 0.04em;
  margin: 0 0 0.75rem;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
}

.page-about .ab-brand__desc {
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.7;
  max-width: 720px;
  margin: 0 0 1.25rem;
  color: var(--color-text-white);
}

.page-about .ab-brand__desc strong {
  color: var(--color-accent-neon-green);
  font-weight: 600;
}

.page-about .ab-brand__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.page-about .ab-brand__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent-dark-gold);
  border: 1px solid var(--color-border-gold);
  padding: 0.25rem 0.85rem;
  background: rgba(184, 134, 11, 0.08);
  border-radius: 0;
  clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 6px, 100% 100%, calc(100% - 6px) 100%, 0 100%);
}

/* ---------- 核心服务区（非对称布局） ---------- */
.page-about .ab-services {
  position: relative;
  background-color: var(--color-background-cream);
  padding: 3rem 0;
}

.page-about .ab-services__inner {
  position: relative;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
  display: flex;
  flex-direction: column;
  gap: var(--ab-gap);
}

/* 斜线装饰 */
.page-about .ab-services__divider {
  display: none;
}

/* --- 侧边栏 --- */
.page-about .ab-services__sidebar {
  flex: 0 0 auto;
  background: var(--color-primary-dark-green);
  color: var(--color-text-white);
  padding: 2rem 1.5rem;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

.page-about .ab-sidebar__title {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-accent-dark-gold);
  margin: 0 0 1rem;
  line-height: 1.2;
}

.page-about .ab-sidebar__text {
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-text-white);
  margin: 0 0 1.8rem;
  opacity: 0.92;
}

.page-about .ab-sidebar__value {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.page-about .ab-value__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  text-align: center;
}

.page-about .ab-value__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
}

.page-about .ab-value__icon svg {
  display: block;
}

.page-about .ab-value__label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--color-accent-dark-gold);
  text-transform: uppercase;
}

.page-about .ab-sidebar__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--color-border-gold);
  clip-path: polygon(8px 0, 100% 0, 100% 100%, 0 100%, 0 8px);
  opacity: 0.85;
  transition: opacity var(--transition-speed);
}

.page-about .ab-sidebar__img:hover {
  opacity: 1;
}

/* --- 主内容区（服务网格） --- */
.page-about .ab-services__main {
  flex: 1 1 auto;
  min-width: 0;
}

.page-about .ab-services__heading {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary-dark-green);
  margin: 0 0 0.25rem;
  line-height: 1.2;
}

.page-about .ab-services__sub {
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--color-text-dark);
  opacity: 0.75;
  margin: 0 0 2rem;
}

.page-about .ab-services__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

/* 服务卡片 */
.page-about .ab-service-card {
  background: var(--color-text-white);
  border: 1px solid var(--color-border-gold);
  padding: 1.8rem 1.5rem 1.5rem;
  position: relative;
  transition: box-shadow var(--transition-speed), transform var(--transition-speed);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
  cursor: default;
  display: flex;
  flex-direction: column;
}

.page-about .ab-service-card:hover,
.page-about .ab-service-card:focus-within {
  box-shadow: 0 8px 28px rgba(26, 60, 42, 0.15);
  transform: translateY(-3px);
}

.page-about .ab-service-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 80px;
  height: 80px;
  margin-bottom: 0.75rem;
  flex-shrink: 0;
}

.page-about .ab-service-card__icon svg {
  display: block;
}

.page-about .ab-service-card__title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-primary-dark-green);
  margin: 0 0 0.4rem;
  letter-spacing: 0.02em;
}

.page-about .ab-service-card__brief {
  font-family: var(--font-body);
  font-size: 0.92rem;
  color: var(--color-accent-dark-gold);
  font-weight: 600;
  margin: 0 0 0.5rem;
}

.page-about .ab-service-card__detail {
  font-family: var(--font-body);
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--color-text-dark);
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transition: opacity 0.35s ease, max-height 0.4s ease, margin 0.3s ease;
  margin: 0;
}

.page-about .ab-service-card:hover .ab-service-card__detail,
.page-about .ab-service-card:focus-within .ab-service-card__detail,
.page-about .ab-service-card__detail--visible {
  opacity: 1;
  max-height: 200px;
  margin: 0 0 1rem;
}

.page-about .ab-service-card__action {
  margin-top: auto;
  padding-top: 0.75rem;
}

.page-about .ab-service-card__action .btn {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-accent-dark-gold);
  background: transparent;
  border: 1px solid var(--color-border-gold);
  padding: 0.5rem 1.4rem;
  text-decoration: none;
  transition: background var(--transition-speed), color var(--transition-speed), border-color var(--transition-speed);
  clip-path: polygon(0 0, calc(100% - 5px) 0, 100% 5px, 100% 100%, calc(100% - 5px) 100%, 0 100%);
}

.page-about .ab-service-card__action .btn:hover,
.page-about .ab-service-card__action .btn:focus-visible {
  background: var(--color-accent-neon-green);
  color: var(--color-text-dark);
  border-color: var(--color-accent-neon-green);
}

/* ---------- 数据来源与时效 ---------- */
.page-about .ab-data {
  background: var(--color-primary-dark-green);
  color: var(--color-text-white);
  padding: 3rem 0;
}

.page-about .ab-data__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.page-about .ab-data__content {
  flex: 1 1 auto;
}

.page-about .ab-data__title {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-accent-dark-gold);
  margin: 0 0 1.25rem;
  line-height: 1.2;
}

.page-about .ab-data__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.page-about .ab-data__item {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--color-text-white);
}

.page-about .ab-data__marker {
  color: var(--color-accent-neon-green);
  font-size: 0.7rem;
  line-height: 1.65;
  flex-shrink: 0;
  margin-top: 0.2rem;
}

.page-about .ab-data__item strong {
  color: var(--color-accent-dark-gold);
  font-weight: 600;
}

.page-about .ab-data__visual {
  flex: 0 0 auto;
  max-width: 100%;
}

.page-about .ab-data__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--color-border-gold);
  opacity: 0.8;
  clip-path: polygon(12px 0, 100% 0, 100% 100%, 0 100%, 0 12px);
}

/* ---------- 联系我们 ---------- */
.page-about .ab-contact {
  background: var(--color-background-cream);
  padding: 3rem 0 4rem;
}

.page-about .ab-contact__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
  text-align: center;
}

.page-about .ab-contact__title {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary-dark-green);
  margin: 0 0 0.6rem;
  line-height: 1.2;
}

.page-about .ab-contact__desc {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-text-dark);
  opacity: 0.75;
  margin: 0 0 2rem;
  max-width: 540px;
  margin-left: auto;
  margin-right: auto;
}

.page-about .ab-contact__channels {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

.page-about .ab-contact__card {
  background: var(--color-text-white);
  border: 1px solid var(--color-border-gold);
  padding: 1.8rem 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
  transition: box-shadow var(--transition-speed), transform var(--transition-speed);
}

.page-about .ab-contact__card:hover {
  box-shadow: 0 6px 20px rgba(26, 60, 42, 0.12);
  transform: translateY(-2px);
}

.page-about .ab-contact__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin-bottom: 0.25rem;
}

.page-about .ab-contact__icon svg {
  display: block;
}

.page-about .ab-contact__label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent-dark-gold);
}

.page-about .ab-contact__value {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary-dark-green);
  text-decoration: none;
  word-break: break-all;
}

.page-about .ab-contact__value--phone {
  font-family: var(--font-data);
  font-size: 1.2rem;
  letter-spacing: 0.04em;
}

.page-about .ab-contact__value a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-speed);
}

.page-about .ab-contact__value a:hover,
.page-about .ab-contact__value a:focus-visible {
  border-bottom-color: var(--color-accent-neon-green);
}

.page-about .ab-contact__note {
  font-family: var(--font-body);
  font-size: 0.8rem;
  color: var(--color-text-dark);
  opacity: 0.6;
  margin-top: 0.15rem;
}

.page-about .ab-contact__cta {
  display: flex;
  justify-content: center;
}

.page-about .ab-contact__cta .btn {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent-dark-gold);
  background: var(--color-primary-dark-green);
  border: 2px solid var(--color-border-gold);
  padding: 0.75rem 2.4rem;
  text-decoration: none;
  transition: background var(--transition-speed), color var(--transition-speed), border-color var(--transition-speed);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, calc(100% - 10px) 100%, 0 100%);
}

.page-about .ab-contact__cta .btn:hover,
.page-about .ab-contact__cta .btn:focus-visible {
  background: var(--color-accent-neon-green);
  color: var(--color-text-dark);
  border-color: var(--color-accent-neon-green);
}

/* =============================================
   桌面端媒体查询 (min-width: 768px)
   ============================================= */
@media (min-width: 768px) {
  .page-about .ab-brand {
    min-height: 460px;
    padding: 5rem 0 3.5rem;
  }

  .page-about .ab-brand__title {
    font-size: 3.8rem;
  }

  .page-about .ab-brand__desc {
    font-size: 1.15rem;
    max-width: 780px;
  }

  .page-about .ab-services {
    padding: 4rem 0;
  }

  .page-about .ab-services__inner {
    flex-direction: row;
    align-items: flex-start;
    gap: 0;
    position: relative;
  }

  /* 斜线装饰 — 桌面显示 */
  .page-about .ab-services__divider {
    display: block;
    position: absolute;
    left: var(--ab-sidebar-ratio);
    top: 0;
    bottom: 0;
    width: 2px;
    background: transparent;
    z-index: 1;
    pointer-events: none;
  }

  .page-about .ab-services__divider::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, var(--color-accent-dark-gold) 0%, var(--color-accent-neon-green) 50%, var(--color-accent-dark-gold) 100%);
    clip-path: polygon(0 0, 100% 0, 60% 100%, 0 100%);
    opacity: 0.35;
  }

  .page-about .ab-services__sidebar {
    flex: 0 0 var(--ab-sidebar-ratio);
    max-width: var(--ab-sidebar-ratio);
    margin-right: 2rem;
    position: relative;
    z-index: 2;
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  }

  .page-about .ab-services__main {
    flex: 1 1 calc(100% - var(--ab-sidebar-ratio) - 2rem);
    max-width: calc(100% - var(--ab-sidebar-ratio) - 2rem);
    padding-left: 0.5rem;
  }

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

  /* 第三个服务卡片跨列 */
  .page-about .ab-service-card:nth-child(3) {
    grid-column: 1 / -1;
  }

  .page-about .ab-service-card__detail {
    opacity: 0;
    max-height: 0;
    margin: 0;
  }

  .page-about .ab-service-card:hover .ab-service-card__detail,
  .page-about .ab-service-card:focus-within .ab-service-card__detail {
    opacity: 1;
    max-height: 200px;
    margin: 0 0 1rem;
  }

  .page-about .ab-data__inner {
    flex-direction: row;
    align-items: center;
    gap: 3rem;
  }

  .page-about .ab-data__content {
    flex: 1 1 55%;
  }

  .page-about .ab-data__visual {
    flex: 1 1 45%;
  }

  .page-about .ab-data__title {
    font-size: 2.2rem;
  }

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

/* =============================================
   大屏优化 (min-width: 1024px)
   ============================================= */
@media (min-width: 1024px) {
  .page-about .ab-brand__title {
    font-size: 4.4rem;
  }

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

  .page-about .ab-service-card:nth-child(3) {
    grid-column: 1 / -1;
  }

  .page-about .ab-sidebar__text {
    font-size: 1rem;
  }

  .page-about .ab-data__title {
    font-size: 2.4rem;
  }
}

/* =============================================
   移动端窄屏修正 (max-width: 374px)
   ============================================= */
@media (max-width: 374px) {
  .page-about .ab-brand__title {
    font-size: 2rem;
  }

  .page-about .ab-sidebar__value {
    grid-template-columns: 1fr;
    gap: 0.8rem;
  }

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