/* =============================================
   page-about – 品牌档案专属样式
   移动端优先，限定 .page-about 作用域
   ============================================= */
.page-about {
  --about-block-color: #B85C41;
  --about-block-offset: 2rem;
  --about-card-shadow: 0 12px 32px rgba(0, 0, 0, 0.25);
  --about-tab-radius: 6px;
  --about-icon-size: 3rem;
  --about-ratio: 1.2;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: 1.25rem;
  padding-bottom: 0.5rem;
  font-family: var(--font-heading);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
}
.page-about .breadcrumb a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--color-hover);
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}
.page-about .breadcrumb__sep {
  margin: 0 0.4em;
  opacity: 0.5;
}

/* ---------- Hero / 品牌理念 ---------- */
.page-about__hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: var(--space-lg) 0 var(--space-xl);
  margin-bottom: 0;
}
.page-about__hero-bg-wrap {
  position: absolute;
  inset: 0;
  z-index: -1;
}
.page-about__hero-bg {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 40% 30%;
  opacity: 0.15;
  filter: saturate(0.4) brightness(0.6);
  display: block;
}
.page-about__hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  align-items: start;
  position: relative;
}
/* 左侧 */
.page-about__hero-left {
  position: relative;
  padding-top: var(--space-md);
}
.page-about__hero-color-block {
  position: absolute;
  top: 0;
  left: -1rem;
  width: 40%;
  height: 6rem;
  background: var(--about-block-color);
  transform: skewX(-8deg);
  opacity: 0.75;
  z-index: 0;
  border-right: 4px solid var(--color-accent);
}
@media (min-width: 768px) {
  .page-about__hero-color-block {
    left: -2rem;
    width: 55%;
    height: 8rem;
  }
}
.page-about__hero-title {
  position: relative;
  z-index: 1;
  font-family: var(--font-heading);
  font-size: var(--font-size-h1);
  font-weight: 700;
  color: var(--color-white);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin: 0 0 0.5rem;
  line-height: 1.05;
  padding-top: 0.25rem;
}
.page-about__hero-desc {
  position: relative;
  z-index: 1;
  font-family: var(--font-body);
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
  color: var(--color-text-secondary);
  max-width: 48ch;
  margin: var(--space-sm) 0 var(--space-md);
}
.page-about__hero-cta {
  position: relative;
  z-index: 1;
  display: inline-block;
  margin-top: 0.5rem;
}

/* 右侧卡片 */
.page-about__hero-right {
  position: relative;
  z-index: 1;
}
.page-about__hero-card {
  background: var(--color-bg-light);
  border: var(--border-width-thick) solid var(--color-primary);
  box-shadow: var(--about-card-shadow), 0 0 0 1px rgba(184, 92, 65, 0.3);
  padding: var(--space-md);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}
.page-about__hero-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35), 0 0 0 1px var(--color-primary);
}
.page-about__hero-card-title {
  font-family: var(--font-heading);
  font-size: var(--font-size-h3);
  font-weight: 700;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 3px solid var(--color-primary);
  padding-bottom: 0.6rem;
  margin-bottom: var(--space-sm);
}
.page-about__hero-card .card__content p {
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}
.page-about__hero-card .card__content p:last-child {
  margin-bottom: 0;
}
.page-about__hero-card-tag {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-top: var(--space-md);
  padding-top: var(--space-sm);
  border-top: 2px dashed var(--color-border);
}
.page-about__hero-card-tag .tag {
  background: var(--color-bg-dark);
  border: 2px solid var(--color-primary);
}
.page-about__hero-card-tag .tag__label {
  color: var(--color-white);
  font-family: var(--font-heading);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ---------- 服务承诺区 ---------- */
.page-about__services {
  background: var(--color-bg-dark);
  position: relative;
  padding: var(--space-xl) 0;
}
.page-about__services::before {
  content: '';
  position: absolute;
  top: -3px;
  left: 0;
  right: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent), var(--color-secondary));
  opacity: 0.6;
}
.page-about__services-intro {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}
.page-about__services-text {
  order: 1;
}
.page-about__services-title {
  font-family: var(--font-heading);
  font-size: var(--font-size-h2);
  color: var(--color-white);
  text-transform: uppercase;
  margin: 0 0 var(--space-sm);
  letter-spacing: 0.02em;
}
.page-about__services-desc {
  font-family: var(--font-body);
  color: var(--color-text-secondary);
  max-width: 44ch;
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
}
.page-about__services-img-wrap {
  order: 0;
  max-width: 300px;
  margin: 0 auto;
}
.page-about__services-img {
  width: 100%;
  height: auto;
  display: block;
  border: var(--border-width-thick) solid var(--color-secondary);
  box-shadow: 0 0 0 2px rgba(91, 123, 111, 0.3);
  transform: rotate(-1.5deg);
  transition: transform var(--transition-normal);
}
.page-about__services-img:hover {
  transform: rotate(0deg) scale(1.01);
}

/* ---------- 标签页 ---------- */
.page-about__tabs {
  position: relative;
  margin-top: var(--space-md);
}
.page-about__tab-radio {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}
.page-about__tab-headers {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: var(--space-md);
  border-bottom: 2px solid rgba(255, 255, 255, 0.1);
  padding-bottom: 0.5rem;
}
.page-about__tab-btn {
  display: inline-block;
  padding: 0.7rem 1.2rem;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
  background: transparent;
  border: 2px solid transparent;
  border-radius: var(--about-tab-radius);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}
.page-about__tab-btn:hover {
  color: var(--color-white);
  border-color: rgba(244, 162, 97, 0.4);
}
#st1:checked ~ .page-about__tab-headers label[for="st1"],
#st2:checked ~ .page-about__tab-headers label[for="st2"],
#st3:checked ~ .page-about__tab-headers label[for="st3"] {
  color: var(--color-white);
  background: var(--color-primary);
  border-color: var(--color-primary);
  box-shadow: 0 4px 12px rgba(184, 92, 65, 0.4);
}
.page-about__tab-body {
  position: relative;
}
.page-about__tab-panel {
  display: none;
  animation: page-about-fadeIn 0.35s ease;
}
#st1:checked ~ .page-about__tab-body .page-about__tab-panel[data-tab="1"],
#st2:checked ~ .page-about__tab-body .page-about__tab-panel[data-tab="2"],
#st3:checked ~ .page-about__tab-body .page-about__tab-panel[data-tab="3"] {
  display: block;
}
@keyframes page-about-fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.page-about__tab-panel-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  padding: var(--space-md);
  background: rgba(255, 255, 255, 0.04);
  border: 2px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--about-tab-radius);
}
.page-about__tab-icon {
  flex-shrink: 0;
  width: var(--about-icon-size);
  height: var(--about-icon-size);
  display: flex;
  align-items: center;
  justify-content: center;
}
.page-about__tab-icon svg {
  width: 100%;
  height: 100%;
}
.page-about__tab-text {
  flex: 1;
}
.page-about__tab-heading {
  font-family: var(--font-heading);
  font-size: var(--font-size-h3);
  color: var(--color-accent);
  margin: 0 0 var(--space-sm);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.page-about__tab-text p {
  font-family: var(--font-body);
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
}
.page-about__tab-text p:last-child {
  margin-bottom: 0;
}

/* ---------- 联系信息区 ---------- */
.page-about__contact {
  background: var(--color-bg-light);
  padding: var(--space-xl) 0 var(--space-lg);
  position: relative;
}
.page-about__contact::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: repeating-linear-gradient(90deg, var(--color-primary) 0 20px, transparent 20px 40px);
}
.page-about__contact-top {
  margin-bottom: var(--space-lg);
}
.page-about__contact-title {
  font-family: var(--font-heading);
  font-size: var(--font-size-h2);
  color: var(--color-text-primary);
  text-transform: uppercase;
  margin: 0 0 var(--space-sm);
}
.page-about__contact-desc {
  font-family: var(--font-body);
  font-size: var(--font-size-body);
  color: var(--color-text-secondary);
  max-width: 52ch;
  line-height: var(--line-height-body);
}
.page-about__contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}
.page-about__contact-card {
  background: var(--color-white);
  border: var(--border-width-medium) solid var(--color-border);
  padding: var(--space-md);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}
.page-about__contact-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
  border-color: var(--color-primary);
}
.page-about__contact-card-icon {
  width: 2.25rem;
  height: 2.25rem;
  margin-bottom: var(--space-sm);
}
.page-about__contact-card-icon svg {
  width: 100%;
  height: 100%;
}
.page-about__contact-card-label {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
  margin-bottom: 0.3rem;
}
.page-about__contact-card-value {
  font-family: var(--font-body);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 0.3rem;
}
.page-about__contact-card-value a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.page-about__contact-card-value a:hover,
.page-about__contact-card-value a:focus-visible {
  color: var(--color-hover);
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}
.page-about__contact-card-note {
  font-family: var(--font-body);
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  opacity: 0.8;
}
.page-about__contact-footer {
  text-align: center;
  padding-top: var(--space-md);
  border-top: 2px dashed var(--color-border);
  margin-top: var(--space-sm);
}
.page-about__contact-footer-img {
  width: 100%;
  max-width: 300px;
  height: auto;
  display: block;
  margin: 0 auto var(--space-sm);
  border: 2px solid var(--color-secondary);
  opacity: 0.7;
  transition: opacity var(--transition-normal);
}
.page-about__contact-footer-img:hover {
  opacity: 1;
}
.page-about__contact-note {
  font-family: var(--font-body);
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.04em;
}

/* =============================================
   桌面端增强 (> 768px)
   ============================================= */
@media (min-width: 768px) {
  .page-about .breadcrumb {
    font-size: 0.85rem;
    padding-top: 1.75rem;
  }

  /* Hero 双列错位 */
  .page-about__hero {
    padding: var(--space-xl) 0 calc(var(--space-xl) * 1.2);
  }
  .page-about__hero-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
  }
  .page-about__hero-left {
    padding-top: var(--space-lg);
  }
  .page-about__hero-color-block {
    width: 70%;
    height: 10rem;
    left: -2.5rem;
  }
  .page-about__hero-title {
    font-size: calc(var(--font-size-h1) * var(--about-ratio));
  }
  .page-about__hero-desc {
    font-size: 1.1rem;
    margin: var(--space-md) 0 var(--space-lg);
  }
  .page-about__hero-card {
    padding: var(--space-lg);
  }

  /* 服务承诺区双列 intro */
  .page-about__services-intro {
    grid-template-columns: 1fr auto;
    align-items: center;
  }
  .page-about__services-text {
    order: 0;
  }
  .page-about__services-img-wrap {
    order: 1;
    max-width: 220px;
    margin: 0;
  }

  /* 标签页内联布局 */
  .page-about__tab-headers {
    gap: 0.75rem;
  }
  .page-about__tab-btn {
    font-size: 0.9rem;
    padding: 0.8rem 1.6rem;
  }
  .page-about__tab-panel-inner {
    flex-direction: row;
    align-items: flex-start;
    padding: var(--space-lg);
  }
  .page-about__tab-icon {
    width: 3.5rem;
    height: 3.5rem;
  }

  /* 联系信息三列网格 */
  .page-about__contact-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
  }
  .page-about__contact-card {
    padding: var(--space-lg);
  }
}

/* =============================================
   大桌面端 (> 1024px)
   ============================================= */
@media (min-width: 1024px) {
  .page-about__hero-title {
    font-size: calc(var(--font-size-h1) * 1.4);
  }
  .page-about__hero-color-block {
    height: 12rem;
    width: 65%;
  }
  .page-about__services-title {
    font-size: calc(var(--font-size-h2) * 1.15);
  }
  .page-about__contact-title {
    font-size: calc(var(--font-size-h2) * 1.1);
  }
}

/* =============================================
   减少动效偏好
   ============================================= */
@media (prefers-reduced-motion: reduce) {
  .page-about__hero-card,
  .page-about__services-img,
  .page-about__contact-card,
  .page-about__contact-footer-img {
    transition: none;
  }
  .page-about__hero-card:hover,
  .page-about__services-img:hover,
  .page-about__contact-card:hover,
  .page-about__contact-footer-img:hover {
    transform: none;
  }
  .page-about__tab-panel {
    animation: none;
  }
}