/* ===== 品牌概况页专属样式 ===== */
.page-about {
  --about-grid-color: rgba(61, 61, 92, 0.25);
  --about-card-radius: 20px;
  --about-timeline-node-size: 120px;
  --about-transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  display: block;
  width: 100%;
}

/* --- 面包屑 --- */
.about-breadcrumb {
  max-width: var(--content-max-width, 1280px);
  margin: 0 auto;
  padding: 1rem 1.5rem 0;
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-size: 0.8125rem;
  letter-spacing: 0.03em;
  color: var(--color-text-light, #E0E0E0);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.about-breadcrumb a {
  color: var(--color-secondary, #6A0DAD);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--about-transition), color var(--about-transition);
}
.about-breadcrumb a:hover,
.about-breadcrumb a:focus-visible {
  border-bottom-color: var(--color-accent, #FF6F00);
  color: var(--color-accent, #FF6F00);
}
.about-breadcrumb__sep {
  opacity: 0.5;
  user-select: none;
}
.about-breadcrumb [aria-current="page"] {
  color: var(--color-text-light, #E0E0E0);
  font-weight: 500;
}

/* --- 板块一：品牌使命 / 技术蓝图 --- */
.about-hero {
  position: relative;
  background: var(--color-primary, #1A1A2E);
  overflow: hidden;
  padding: 3rem 1.5rem 4rem;
  margin: 0 0 2rem;
}
.about-hero__grid-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.6;
  transition: transform 0.6s ease-out;
}
.about-hero__grid-bg:hover {
  transform: translateX(6px) translateY(4px);
}
.about-hero__grid-svg {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 480px;
}
.about-hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
}
.about-hero__title {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.2;
  color: #ffffff;
  margin: 0 0 1.2rem;
  max-width: 780px;
  margin-left: auto;
  margin-right: auto;
}
.about-hero__desc {
  font-family: var(--font-body, 'Source Serif Pro', serif);
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--color-text-light, #E0E0E0);
  max-width: 620px;
  margin: 0 auto 2.2rem;
}
.about-hero__media {
  display: flex;
  justify-content: center;
}
.about-hero__img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg, 16px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
  object-fit: cover;
}

/* --- 板块二：服务范围 / 时间线 --- */
.about-services {
  background: var(--color-bg-light, #F5F5F5);
  padding: 3.5rem 1.5rem 4rem;
}
.about-services__heading {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--color-primary, #1A1A2E);
  text-align: center;
  margin: 0 0 0.5rem;
}
.about-services__sub {
  font-family: var(--font-body, 'Source Serif Pro', serif);
  font-size: 1.05rem;
  color: #555;
  text-align: center;
  margin: 0 0 3rem;
}
.about-timeline {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}
.about-timeline::before {
  content: '';
  position: absolute;
  left: 60px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border, #3D3D5C);
  opacity: 0.3;
}
.about-timeline__item {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  position: relative;
}
.about-timeline__node {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  width: var(--about-timeline-node-size, 120px);
  position: relative;
  z-index: 1;
}
.about-timeline__icon {
  width: 100px;
  height: 100px;
  border-radius: var(--radius-pill, 50px);
  object-fit: cover;
  border: 2px solid var(--color-secondary, #6A0DAD);
  transition: border-color var(--about-transition), box-shadow var(--about-transition);
  background: var(--color-primary, #1A1A2E);
}
.about-timeline__item:hover .about-timeline__icon,
.about-timeline__item:focus-within .about-timeline__icon {
  border-color: var(--color-accent, #FF6F00);
  box-shadow: 0 0 0 4px rgba(106, 13, 173, 0.2);
}
.about-timeline__badge {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: #fff;
  background: var(--color-secondary, #6A0DAD);
  padding: 0.2rem 0.7rem;
  border-radius: var(--radius-pill, 50px);
  white-space: nowrap;
}
.about-timeline__body {
  flex: 1;
  min-width: 0;
}
.about-timeline__title {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-primary, #1A1A2E);
  margin: 0 0 0.4rem;
}
.about-timeline__summary {
  font-family: var(--font-body, 'Source Serif Pro', serif);
  font-size: 0.95rem;
  line-height: 1.6;
  color: #444;
  margin: 0 0 0.5rem;
}
.about-timeline__detail {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--about-transition), opacity var(--about-transition);
  opacity: 0;
}
.about-timeline__item:hover .about-timeline__detail,
.about-timeline__item:focus-within .about-timeline__detail {
  max-height: 120px;
  opacity: 1;
}
.about-timeline__detail p {
  font-family: var(--font-body, 'Source Serif Pro', serif);
  font-size: 0.9rem;
  line-height: 1.6;
  color: #666;
  margin: 0;
  padding-top: 0.4rem;
  border-top: 1px dashed var(--color-border, #3D3D5C);
}
.about-services__more {
  text-align: center;
  margin-top: 3rem;
}

/* --- 板块三：本地化支持 --- */
.about-local {
  background: var(--color-primary, #1A1A2E);
  padding: 3.5rem 1.5rem 4rem;
  position: relative;
  overflow: hidden;
}
.about-local::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(106, 13, 173, 0.12) 0%, transparent 70%);
  pointer-events: none;
}
.about-local__grid {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  align-items: center;
  position: relative;
  z-index: 1;
}
.about-local__map-area {
  text-align: center;
}
.about-local__heading {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #ffffff;
  margin: 0 0 0.5rem;
}
.about-local__subhead {
  font-family: var(--font-body, 'Source Serif Pro', serif);
  font-size: 1.05rem;
  color: var(--color-text-light, #E0E0E0);
  margin: 0 0 1.5rem;
}
.about-local__map {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg, 16px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
  object-fit: cover;
  border: 1px solid var(--color-border, #3D3D5C);
}
.about-local__info {
  max-width: 520px;
}
.about-local__list {
  list-style: none;
  padding: 0;
  margin: 0 0 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}
.about-local__item {
  font-family: var(--font-body, 'Source Serif Pro', serif);
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-text-light, #E0E0E0);
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
}
.about-local__marker {
  color: var(--color-accent, #FF6F00);
  font-size: 1rem;
  flex-shrink: 0;
  margin-top: 0.25rem;
}
.about-local__contact {
  text-align: center;
}

/* --- 板块四：信任与行动 --- */
.about-trust {
  background: var(--color-bg-light, #F5F5F5);
  padding: 2.5rem 1.5rem 3rem;
  text-align: center;
}
.about-trust__statement {
  font-family: var(--font-body, 'Source Serif Pro', serif);
  font-size: 0.85rem;
  color: #888;
  max-width: 560px;
  margin: 0 auto 1.2rem;
  line-height: 1.5;
}
.about-trust__links {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem 1rem;
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-size: 0.9rem;
}
.about-trust__link {
  color: var(--color-secondary, #6A0DAD);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--about-transition), color var(--about-transition);
}
.about-trust__link:hover,
.about-trust__link:focus-visible {
  border-bottom-color: var(--color-accent, #FF6F00);
  color: var(--color-accent, #FF6F00);
}
.about-trust__sep {
  color: #ccc;
  user-select: none;
}

/* --- 通用按钮覆盖（作用域内） --- */
.page-about .btn {
  display: inline-block;
  padding: 0.7rem 1.8rem;
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  border-radius: var(--radius-pill, 50px);
  text-decoration: none;
  transition: background var(--about-transition), transform var(--about-transition), box-shadow var(--about-transition);
  cursor: default;
}
.page-about .btn-primary {
  background: var(--color-secondary, #6A0DAD);
  color: #ffffff;
  border: 1px solid var(--color-secondary, #6A0DAD);
}
.page-about .btn-primary:hover,
.page-about .btn-primary:focus-visible {
  background: transparent;
  color: var(--color-secondary, #6A0DAD);
  box-shadow: 0 0 0 2px var(--color-secondary, #6A0DAD);
  transform: translateY(-2px);
}
.page-about .btn-accent {
  background: var(--color-accent, #FF6F00);
  color: #0D0D0D;
  border: 1px solid var(--color-accent, #FF6F00);
}
.page-about .btn-accent:hover,
.page-about .btn-accent:focus-visible {
  background: transparent;
  color: var(--color-accent, #FF6F00);
  box-shadow: 0 0 0 2px var(--color-accent, #FF6F00);
  transform: translateY(-2px);
}

/* --- 响应式：移动端优先 → 桌面 --- */
@media (max-width: 479px) {
  .about-hero__title {
    font-size: 1.6rem;
  }
  .about-hero__desc {
    font-size: 0.95rem;
  }
  .about-timeline::before {
    left: 40px;
  }
  .about-timeline__node {
    width: 80px;
  }
  .about-timeline__icon {
    width: 70px;
    height: 70px;
  }
  .about-timeline__title {
    font-size: 1rem;
  }
  .about-local__heading {
    font-size: 1.5rem;
  }
}

@media (min-width: 480px) and (max-width: 767px) {
  .about-hero__title {
    font-size: 1.9rem;
  }
  .about-timeline__node {
    width: 100px;
  }
  .about-timeline__icon {
    width: 85px;
    height: 85px;
  }
}

@media (min-width: 768px) {
  .about-hero {
    padding: 4rem 2rem 5rem;
  }
  .about-hero__title {
    font-size: 2.6rem;
  }
  .about-hero__desc {
    font-size: 1.15rem;
  }
  .about-timeline {
    flex-direction: row;
    gap: 1.5rem;
    max-width: none;
  }
  .about-timeline::before {
    left: auto;
    top: var(--about-timeline-node-size, 120px);
    width: 70%;
    height: 2px;
    margin: 0 auto;
    left: 15%;
    right: 15%;
  }
  .about-timeline__item {
    flex-direction: column;
    align-items: center;
    flex: 1;
    text-align: center;
  }
  .about-timeline__node {
    width: auto;
  }
  .about-timeline__body {
    max-width: 280px;
  }
  .about-timeline__title {
    font-size: 1.1rem;
  }
  .about-timeline__detail {
    max-height: 0;
  }
  .about-timeline__item:hover .about-timeline__detail,
  .about-timeline__item:focus-within .about-timeline__detail {
    max-height: 140px;
  }
  .about-local__grid {
    flex-direction: row;
    justify-content: center;
    align-items: flex-start;
    gap: 3rem;
  }
  .about-local__map-area {
    flex-shrink: 0;
  }
  .about-local__info {
    flex: 1;
    max-width: 440px;
  }
}

@media (min-width: 1024px) {
  .about-hero__title {
    font-size: 3rem;
    max-width: 840px;
  }
  .about-hero__desc {
    font-size: 1.2rem;
    max-width: 700px;
  }
  .about-services {
    padding: 4.5rem 2rem 5rem;
  }
  .about-local {
    padding: 4.5rem 2rem 5rem;
  }
  .about-timeline {
    gap: 2.5rem;
  }
  .about-timeline__body {
    max-width: 320px;
  }
}

@media (min-width: 1280px) {
  .about-hero {
    padding: 5rem 2rem 6rem;
  }
  .about-hero__title {
    font-size: 3.4rem;
  }
}