/* ============================================
   page-about – 品牌概况
   专属样式，作用域限定 .page-about
   ============================================ */
.page-about {
  --about-red: #E63946;
  --about-blue: #1D3557;
  --about-gold: #F4A261;
  --about-light: #F1FAEE;
  --about-dark: #0B1622;
  --about-text: #2C3E50;
  --about-text-muted: #7F8C8D;
  --about-font-heading: var(--font-heading, 'Oswald','Impact','Arial Black',sans-serif);
  --about-font-body: var(--font-body, 'Roboto','Segoe UI','Helvetica Neue',Arial,sans-serif);
  --about-font-numeric: var(--font-numeric, 'Roboto Mono','Consolas','Courier New',monospace);
  --about-radius-sm: 12px;
  --about-radius-lg: 40px;
  --about-radius-xl: 80px;
  --about-transition: 0.4s cubic-bezier(0.25,0.46,0.45,0.94);
  display: block;
  width: 100%;
  background: var(--about-light);
  color: var(--about-text);
  font-family: var(--about-font-body);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.about-breadcrumb {
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
  padding: 1rem 1.5rem 0;
  font-size: 0.875rem;
  color: var(--about-text-muted);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
}
.about-breadcrumb a {
  color: var(--about-blue);
  text-decoration: none;
  transition: color var(--about-transition);
}
.about-breadcrumb a:hover,
.about-breadcrumb a:focus-visible {
  color: var(--about-red);
  text-decoration: underline;
}
.about-breadcrumb__sep {
  color: var(--about-text-muted);
  font-size: 1.1em;
}
.about-breadcrumb [aria-current="page"] {
  color: var(--about-red);
  font-weight: 600;
}

/* ---------- 品牌叙事 首屏 ---------- */
.about-hero {
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  position: relative;
}
.about-hero__visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}
.about-hero__image-wrapper {
  position: relative;
  width: 100%;
  max-width: 480px;
  aspect-ratio: 1/1;
  border-radius: var(--about-radius-xl);
  overflow: hidden;
  box-shadow: 0 12px 40px rgba(29,53,87,0.15);
  z-index: 2;
}
.about-hero__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.about-hero__shape {
  position: absolute;
  top: -10%;
  right: -5%;
  width: 55%;
  height: 55%;
  background: var(--about-red);
  border-radius: 50% 30% 50% 30%;
  opacity: 0.08;
  z-index: 0;
  pointer-events: none;
}
.about-hero__content {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  z-index: 2;
}
.about-hero__label {
  display: inline-block;
  font-family: var(--about-font-heading);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--about-red);
  background: rgba(230,57,70,0.08);
  padding: 0.3rem 1rem;
  border-radius: var(--about-radius-lg);
  align-self: flex-start;
}
.about-hero__title {
  font-family: var(--about-font-heading);
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 700;
  line-height: 1.05;
  color: var(--about-blue);
  margin: 0;
  letter-spacing: -0.02em;
}
.about-hero__tagline {
  font-family: var(--about-font-heading);
  font-size: clamp(1.4rem, 3.5vw, 2.4rem);
  font-weight: 400;
  color: var(--about-red);
  margin: 0;
  letter-spacing: 0.04em;
}
.about-hero__desc {
  font-size: 1.05rem;
  max-width: 580px;
  color: var(--about-text);
  margin: 0.5rem 0 0.25rem;
  line-height: 1.7;
}
.about-hero__desc strong {
  color: var(--about-blue);
  font-weight: 600;
}
.about-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.25rem;
}
.about-hero__tags .tag {
  background: rgba(29,53,87,0.07);
  color: var(--about-blue);
  font-size: 0.8rem;
  padding: 0.35rem 1rem;
  border-radius: var(--about-radius-lg);
  font-family: var(--about-font-body);
  font-weight: 500;
  border: 1px solid rgba(29,53,87,0.12);
}
.about-hero__tags .tag-gold {
  background: rgba(244,162,97,0.15);
  color: #8B5A2B;
  border-color: rgba(244,162,97,0.3);
}
.about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.75rem;
}
.about-hero__actions .btn {
  padding: 0.7rem 1.8rem;
  border-radius: var(--about-radius-lg);
  font-family: var(--about-font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: all var(--about-transition);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.about-hero__actions .btn-primary {
  background: var(--about-red);
  color: #fff;
  border: 2px solid var(--about-red);
}
.about-hero__actions .btn-primary:hover,
.about-hero__actions .btn-primary:focus-visible {
  background: #c92e3a;
  border-color: #c92e3a;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(230,57,70,0.3);
}
.about-hero__actions .btn-secondary {
  background: transparent;
  color: var(--about-blue);
  border: 2px solid var(--about-blue);
}
.about-hero__actions .btn-secondary:hover,
.about-hero__actions .btn-secondary:focus-visible {
  background: var(--about-blue);
  color: #fff;
  transform: translateY(-2px);
}

/* ---------- 时间线 ---------- */
.about-timeline {
  background: var(--about-dark);
  color: #fff;
  padding: 3.5rem 1.5rem 4rem;
  position: relative;
  overflow: hidden;
}
.about-timeline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--about-red), var(--about-gold), var(--about-blue));
  opacity: 0.6;
}
.about-timeline__inner {
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
}
.about-timeline__heading {
  font-family: var(--about-font-heading);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  color: #fff;
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}
.about-timeline__intro {
  color: rgba(255,255,255,0.7);
  font-size: 1rem;
  margin: 0 0 2.5rem;
  max-width: 500px;
}
.about-timeline__track {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
}
.about-timeline__item {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 0.75rem;
  position: relative;
  padding-bottom: 0;
}
.about-timeline__item:last-child {
  padding-bottom: 0;
}
.about-timeline__marker {
  display: flex;
  flex-direction: column;
  align-items: center;
  height: 100%;
  padding-top: 0.4rem;
}
.about-timeline__dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--about-gold);
  border: 3px solid var(--about-dark);
  box-shadow: 0 0 0 3px var(--about-gold);
  flex-shrink: 0;
  z-index: 2;
  transition: transform var(--about-transition), box-shadow var(--about-transition);
}
.about-timeline__item:hover .about-timeline__dot,
.about-timeline__item:focus-within .about-timeline__dot {
  transform: scale(1.25);
  box-shadow: 0 0 0 5px var(--about-gold);
}
.about-timeline__line {
  width: 2px;
  flex: 1;
  background: linear-gradient(to bottom, var(--about-gold), transparent);
  opacity: 0.35;
  margin-top: 4px;
}
.about-timeline__item:last-child .about-timeline__line {
  display: none;
}
.about-timeline__card {
  perspective: 800px;
  margin-bottom: 1.5rem;
  cursor: default;
}
.about-timeline__card--flip {
  position: relative;
  min-height: 140px;
}
.about-timeline__card-front,
.about-timeline__card-back {
  padding: 1.25rem 1.5rem;
  border-radius: var(--about-radius-sm);
  backface-visibility: hidden;
  transition: transform 0.5s cubic-bezier(0.23,1,0.32,1);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.08);
}
.about-timeline__card-front {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}
.about-timeline__card-back {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  transform: rotateY(180deg);
  background: rgba(230,57,70,0.12);
  border-color: rgba(230,57,70,0.2);
}
.about-timeline__item:hover .about-timeline__card-front,
.about-timeline__item:focus-within .about-timeline__card-front {
  transform: rotateY(-180deg);
}
.about-timeline__item:hover .about-timeline__card-back,
.about-timeline__item:focus-within .about-timeline__card-back {
  transform: rotateY(0deg);
}
.about-timeline__phase {
  font-family: var(--about-font-numeric);
  font-size: 0.75rem;
  color: var(--about-gold);
  letter-spacing: 0.1em;
  opacity: 0.7;
}
.about-timeline__item-title {
  font-family: var(--about-font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  color: #fff;
  margin: 0;
}
.about-timeline__summary {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.7);
  margin: 0;
}
.about-timeline__detail {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.9);
  line-height: 1.7;
  margin: 0;
  padding: 0.2rem 0;
}

/* ---------- 核心优势 ---------- */
.about-advantages {
  padding: 3.5rem 1.5rem 3rem;
  background: var(--about-light);
}
.about-advantages__inner {
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
}
.about-advantages__header {
  text-align: center;
  margin-bottom: 2.5rem;
}
.about-advantages__label {
  display: inline-block;
  font-family: var(--about-font-heading);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--about-red);
  background: rgba(230,57,70,0.08);
  padding: 0.25rem 1.2rem;
  border-radius: var(--about-radius-lg);
  margin-bottom: 0.5rem;
}
.about-advantages__heading {
  font-family: var(--about-font-heading);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--about-blue);
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}
.about-advantages__sub {
  color: var(--about-text-muted);
  font-size: 1rem;
  margin: 0;
}
.about-advantages__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}
.about-advantage-card {
  perspective: 900px;
  cursor: default;
  min-height: 220px;
}
.about-advantage-card__inner {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 220px;
  transform-style: preserve-3d;
  transition: transform 0.55s cubic-bezier(0.23,1,0.32,1);
  border-radius: var(--about-radius-sm);
  box-shadow: 0 4px 20px rgba(29,53,87,0.06);
}
.about-advantage-card:hover .about-advantage-card__inner,
.about-advantage-card:focus-within .about-advantage-card__inner {
  transform: rotateY(180deg);
}
.about-advantage-card__front,
.about-advantage-card__back {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: var(--about-radius-sm);
  padding: 1.75rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: #fff;
  border: 1px solid rgba(29,53,87,0.06);
}
.about-advantage-card__front {
  gap: 0.75rem;
}
.about-advantage-card__back {
  transform: rotateY(180deg);
  background: var(--about-blue);
  color: #fff;
  border-color: var(--about-blue);
  gap: 0.5rem;
}
.about-advantage-card__icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(230,57,70,0.06);
  border-radius: var(--about-radius-sm);
  padding: 6px;
}
.about-advantage-card:nth-child(2) .about-advantage-card__icon {
  background: rgba(29,53,87,0.06);
}
.about-advantage-card:nth-child(3) .about-advantage-card__icon {
  background: rgba(244,162,97,0.1);
}
.about-advantage-card__title {
  font-family: var(--about-font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--about-blue);
  margin: 0;
}
.about-advantage-card__brief {
  font-size: 0.9rem;
  color: var(--about-text-muted);
  margin: 0;
  line-height: 1.5;
}
.about-advantage-card__detail {
  font-size: 0.95rem;
  color: rgba(255,255,255,0.92);
  line-height: 1.7;
  margin: 0;
}
.about-advantages__chart {
  max-width: 820px;
  margin: 0 auto;
  border-radius: var(--about-radius-sm);
  overflow: hidden;
  box-shadow: 0 6px 28px rgba(29,53,87,0.08);
}
.about-advantages__chart-img {
  width: 100%;
  height: auto;
  display: block;
}

/* ---------- 区域专注 ---------- */
.about-region {
  padding: 3rem 1.5rem 3.5rem;
  background: #fff;
  position: relative;
}
.about-region::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 80px;
  background: linear-gradient(to top, var(--about-light), transparent);
  pointer-events: none;
}
.about-region__inner {
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
}
.about-region__map {
  display: flex;
  justify-content: center;
}
.about-region__map-wrapper {
  max-width: 400px;
  width: 100%;
  border-radius: var(--about-radius-lg);
  overflow: hidden;
  box-shadow: 0 8px 30px rgba(29,53,87,0.1);
  border: 3px solid var(--about-light);
  transition: box-shadow var(--about-transition);
}
.about-region__map-wrapper:hover {
  box-shadow: 0 12px 40px rgba(230,57,70,0.15);
}
.about-region__map-img {
  width: 100%;
  height: auto;
  display: block;
}
.about-region__content {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.about-region__label {
  display: inline-block;
  font-family: var(--about-font-heading);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--about-gold);
  background: rgba(244,162,97,0.12);
  padding: 0.25rem 1.2rem;
  border-radius: var(--about-radius-lg);
  align-self: flex-start;
}
.about-region__heading {
  font-family: var(--about-font-heading);
  font-size: clamp(1.6rem, 3.5vw, 2.6rem);
  font-weight: 700;
  color: var(--about-blue);
  margin: 0;
  letter-spacing: -0.02em;
}
.about-region__text {
  font-size: 1.05rem;
  color: var(--about-text);
  line-height: 1.7;
  margin: 0;
  max-width: 560px;
}
.about-region__text strong {
  color: var(--about-red);
  font-weight: 600;
}
.about-region__stats {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.25rem;
}
.about-region__stat {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.95rem;
  color: var(--about-text);
}
.about-region__stat-num {
  font-family: var(--about-font-numeric);
  color: var(--about-red);
  font-weight: 700;
  font-size: 1.1rem;
  width: 1.5rem;
  text-align: center;
}
.about-region__stat-desc {
  flex: 1;
}
.about-region__content .btn {
  align-self: flex-start;
  margin-top: 0.5rem;
  padding: 0.7rem 2.2rem;
  border-radius: var(--about-radius-lg);
  font-family: var(--about-font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: all var(--about-transition);
  background: var(--about-red);
  color: #fff;
  border: 2px solid var(--about-red);
}
.about-region__content .btn:hover,
.about-region__content .btn:focus-visible {
  background: #c92e3a;
  border-color: #c92e3a;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(230,57,70,0.3);
}

/* ---------- 信任与引导 ---------- */
.about-trust {
  background: var(--about-dark);
  color: #fff;
  padding: 3rem 1.5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.about-trust::before {
  content: '';
  position: absolute;
  top: -30%;
  right: -10%;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: var(--about-red);
  opacity: 0.06;
  pointer-events: none;
}
.about-trust::after {
  content: '';
  position: absolute;
  bottom: -20%;
  left: -5%;
  width: 150px;
  height: 150px;
  border-radius: 50%;
  background: var(--about-gold);
  opacity: 0.05;
  pointer-events: none;
}
.about-trust__inner {
  max-width: 600px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  position: relative;
  z-index: 1;
}
.about-trust__icon {
  opacity: 0.6;
  margin-bottom: 0.25rem;
}
.about-trust__heading {
  font-family: var(--about-font-heading);
  font-size: clamp(1.3rem, 3vw, 2rem);
  font-weight: 600;
  color: #fff;
  margin: 0;
  letter-spacing: -0.01em;
}
.about-trust__text {
  color: rgba(255,255,255,0.7);
  font-size: 1rem;
  margin: 0;
}
.about-trust__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.75rem;
}
.about-trust__links .btn {
  padding: 0.7rem 2rem;
  border-radius: var(--about-radius-lg);
  font-family: var(--about-font-heading);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  transition: all var(--about-transition);
  letter-spacing: 0.02em;
}
.about-trust__links .btn-secondary {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,0.3);
}
.about-trust__links .btn-secondary:hover,
.about-trust__links .btn-secondary:focus-visible {
  border-color: #fff;
  background: rgba(255,255,255,0.06);
  transform: translateY(-2px);
}
.about-trust__links .btn-primary {
  background: var(--about-red);
  color: #fff;
  border: 2px solid var(--about-red);
}
.about-trust__links .btn-primary:hover,
.about-trust__links .btn-primary:focus-visible {
  background: #c92e3a;
  border-color: #c92e3a;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(230,57,70,0.3);
}

/* ============================================
   响应式 – 桌面 (≥768px)
   ============================================ */
@media (min-width: 768px) {
  /* 品牌叙事 并排 */
  .about-hero {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    padding: 3rem 2rem 4rem;
    align-items: center;
  }
  .about-hero__visual {
    order: 1;
    justify-content: flex-end;
  }
  .about-hero__content {
    order: 0;
  }
  .about-hero__image-wrapper {
    max-width: 520px;
  }
  .about-hero__title {
    font-size: clamp(2.8rem, 5vw, 4rem);
  }
  .about-hero__desc {
    font-size: 1.1rem;
  }

  /* 时间线 横向展开 */
  .about-timeline {
    padding: 4rem 2rem 5rem;
  }
  .about-timeline__track {
    flex-direction: row;
    gap: 1.5rem;
    justify-content: space-between;
  }
  .about-timeline__item {
    grid-template-columns: 1fr;
    gap: 0.5rem;
    flex: 1;
    padding-bottom: 0;
  }
  .about-timeline__marker {
    flex-direction: row;
    height: auto;
    padding-top: 0;
    justify-content: center;
    gap: 0;
  }
  .about-timeline__dot {
    width: 20px;
    height: 20px;
  }
  .about-timeline__line {
    width: auto;
    height: 2px;
    flex: 1;
    background: linear-gradient(to right, var(--about-gold), transparent);
    margin-top: 0;
    margin-left: 4px;
  }
  .about-timeline__item:last-child .about-timeline__line {
    display: none;
  }
  .about-timeline__card {
    margin-bottom: 0;
    min-height: 180px;
  }
  .about-timeline__card--flip {
    min-height: 180px;
  }
  .about-timeline__card-front,
  .about-timeline__card-back {
    padding: 1.5rem 1.75rem;
  }
  .about-timeline__item-title {
    font-size: 1.35rem;
  }

  /* 核心优势 三列网格 */
  .about-advantages {
    padding: 4rem 2rem 3.5rem;
  }
  .about-advantages__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.75rem;
  }
  .about-advantage-card {
    min-height: 250px;
  }
  .about-advantage-card__inner {
    min-height: 250px;
  }

  /* 区域专注 并排 */
  .about-region {
    padding: 3.5rem 2rem 4rem;
  }
  .about-region__inner {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }
  .about-region__map {
    order: 0;
    justify-content: flex-start;
  }
  .about-region__content {
    order: 1;
  }
  .about-region__heading {
    font-size: clamp(1.8rem, 3vw, 2.6rem);
  }
  .about-region__text {
    font-size: 1.1rem;
  }

  /* 信任区 */
  .about-trust {
    padding: 4rem 2rem;
  }
}

/* ============================================
   大屏优化 (≥1024px)
   ============================================ */
@media (min-width: 1024px) {
  .about-hero {
    padding: 4rem 2.5rem 5rem;
    gap: 4rem;
  }
  .about-hero__image-wrapper {
    max-width: 560px;
  }
  .about-timeline {
    padding: 5rem 2.5rem 6rem;
  }
  .about-timeline__track {
    gap: 2rem;
  }
  .about-advantages {
    padding: 5rem 2.5rem 4rem;
  }
  .about-advantages__grid {
    gap: 2rem;
  }
  .about-region {
    padding: 4.5rem 2.5rem 5rem;
  }
  .about-region__inner {
    gap: 4rem;
  }
}

/* ============================================
   辅助工具类 (作用域内)
   ============================================ */
.page-about .visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}
.page-about .tag {
  display: inline-block;
}