/* ===== 页面专属：关于我们 ===== */
.page-about {
  background-color: var(--cream-bg);
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gap) 4rem;
  color: var(--deep-brown);
  font-family: var(--font-body);
  position: relative;
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1.25rem 0 0.75rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--deep-brown);
  opacity: 0.7;
  letter-spacing: 0.02em;
}
.page-about .breadcrumb__link {
  color: var(--deep-brown);
  text-decoration: none;
  transition: color var(--transition);
}
.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--red-orange);
  outline: 2px solid var(--red-orange);
  outline-offset: 2px;
  border-radius: 2px;
}
.page-about .breadcrumb__sep {
  pointer-events: none;
  color: var(--silver-border);
}
.page-about .breadcrumb__current {
  font-weight: 600;
  color: var(--deep-brown);
}

/* 左右分屏容器 */
.page-about .about-split {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  margin-top: 1rem;
}

/* ===== 左屏：品牌宣言 ===== */
.page-about .about-split__left {
  flex: 0 1 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 1.5rem 0;
}

.page-about .brand-graphic {
  margin-bottom: 1.75rem;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: var(--white-card);
  box-shadow: var(--shadow-card);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem;
  border: 2px solid var(--silver-border);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.page-about .brand-graphic:hover {
  border-color: var(--red-orange);
  box-shadow: var(--shadow-float);
}
.page-about .brand-graphic__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 50%;
}

.page-about .about-title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(2.25rem, 5.5vw, 3.75rem);
  letter-spacing: -0.02em;
  line-height: 1.05;
  color: var(--deep-brown);
  margin: 0 0 0.35rem;
  text-transform: uppercase;
  word-break: break-word;
}

.page-about .about-subtitle {
  font-family: var(--font-accent);
  font-weight: 500;
  font-size: clamp(1rem, 2.2vw, 1.375rem);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--red-orange);
  margin: 0 0 1.5rem;
  opacity: 0.9;
}

.page-about .about-text {
  max-width: 480px;
  font-size: 1rem;
  line-height: 1.65;
  color: var(--deep-brown);
  opacity: 0.88;
  margin-bottom: 2rem;
}
.page-about .about-text p {
  margin: 0 0 0.9rem;
}
.page-about .about-text p:last-child {
  margin-bottom: 0;
}

.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.25rem;
  justify-content: center;
}
.page-about .about-links .btn {
  font-size: 0.9375rem;
  padding: 0.625rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition), border-color var(--transition);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}
.page-about .about-links .btn:focus-visible {
  outline: 2px solid var(--red-orange);
  outline-offset: 3px;
}
.page-about .about-links .btn--primary {
  background-color: var(--red-orange);
  border: 2px solid var(--red-orange);
  color: var(--white-card);
}
.page-about .about-links .btn--primary:hover {
  background-color: transparent;
  color: var(--red-orange);
}
.page-about .about-links .btn--outline {
  background-color: transparent;
  border: 2px solid var(--deep-brown);
  color: var(--deep-brown);
}
.page-about .about-links .btn--outline:hover {
  background-color: var(--deep-brown);
  color: var(--white-card);
}

/* ===== 右屏：功能卡片 ===== */
.page-about .about-split__right {
  flex: 0 1 auto;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.page-about .feature-card {
  background: var(--white-card);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  border: 1px solid var(--silver-border);
  position: relative;
}
.page-about .feature-card:hover,
.page-about .feature-card:focus-within {
  transform: translateY(-4px);
  box-shadow: var(--shadow-float);
  border-color: var(--red-orange);
}

.page-about .feature-card__accent {
  height: 4px;
  background: var(--red-orange);
  flex-shrink: 0;
}

.page-about .feature-card__img-wrap {
  width: 100%;
  overflow: hidden;
  background: var(--light-gray-bg);
  line-height: 0;
}
.page-about .feature-card__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  transition: transform 0.45s ease;
}
.page-about .feature-card:hover .feature-card__img {
  transform: scale(1.03);
}

.page-about .feature-card__content {
  padding: 1.25rem 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  flex: 1;
}

.page-about .feature-card--center .feature-card__content {
  padding-top: 1.5rem;
}

.page-about .feature-card__icon {
  margin-bottom: 0.4rem;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
}
.page-about .feature-card__icon svg {
  display: block;
  width: 100%;
  height: 100%;
}

.page-about .feature-card__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
  color: var(--deep-brown);
  margin: 0;
  line-height: 1.2;
}

.page-about .feature-card__summary {
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--deep-brown);
  opacity: 0.82;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: -webkit-line-clamp var(--transition);
}
@media (hover: hover) {
  .page-about .feature-card:hover .feature-card__summary {
    -webkit-line-clamp: 6;
  }
}

.page-about .feature-card__hover-tip {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--red-orange);
  opacity: 0;
  transform: translateY(4px);
  transition: opacity var(--transition), transform var(--transition);
  margin-top: 0.15rem;
  line-height: 1.4;
}
@media (hover: hover) {
  .page-about .feature-card:hover .feature-card__hover-tip {
    opacity: 1;
    transform: translateY(0);
  }
}
.page-about .feature-card:focus-within .feature-card__hover-tip {
  opacity: 1;
  transform: translateY(0);
}

.page-about .feature-card__details {
  margin-top: 0.3rem;
  font-size: 0.9375rem;
}
.page-about .feature-card__details[open] {
  margin-top: 0.5rem;
}
.page-about .feature-card__summary-trigger {
  font-family: var(--font-accent);
  font-weight: 500;
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--deep-blue);
  cursor: pointer;
  user-select: none;
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0;
  border-radius: var(--radius-sm);
  transition: color var(--transition);
}
.page-about .feature-card__summary-trigger::-webkit-details-marker {
  display: none;
}
.page-about .feature-card__summary-trigger::before {
  content: "+";
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--red-orange);
  transition: transform var(--transition);
  line-height: 1;
}
.page-about .feature-card__details[open] .feature-card__summary-trigger::before {
  content: "−";
  transform: rotate(0deg);
}
.page-about .feature-card__summary-trigger:hover,
.page-about .feature-card__summary-trigger:focus-visible {
  color: var(--red-orange);
  outline: none;
}
.page-about .feature-card__summary-trigger:focus-visible {
  outline: 2px solid var(--red-orange);
  outline-offset: 2px;
}

.page-about .feature-card__detail-text {
  padding: 0.75rem 0 0.2rem;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--deep-brown);
  opacity: 0.88;
  border-top: 1px solid var(--silver-border);
  margin-top: 0.25rem;
}
.page-about .feature-card__detail-text p {
  margin: 0 0 0.6rem;
}
.page-about .feature-card__detail-text p:last-child {
  margin-bottom: 0;
}
.page-about .feature-card__link {
  color: var(--red-orange);
  font-weight: 600;
  text-decoration: none;
  transition: color var(--transition);
  display: inline-block;
  margin-top: 0.25rem;
}
.page-about .feature-card__link:hover,
.page-about .feature-card__link:focus-visible {
  color: var(--deep-blue);
  outline: 2px solid var(--red-orange);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ===== 为什么选择我们 ===== */
.page-about .why-section {
  margin-top: 3.5rem;
  background: var(--deep-blue);
  border-radius: var(--radius-lg);
  padding: 2.5rem 1.5rem 2.75rem;
  color: var(--white-card);
  text-align: center;
}
.page-about .why-section__title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  letter-spacing: -0.02em;
  color: var(--white-card);
  margin: 0 0 2rem;
  position: relative;
  display: inline-block;
}
.page-about .why-section__title::after {
  content: "";
  display: block;
  width: 60px;
  height: 3px;
  background: var(--red-orange);
  margin: 0.6rem auto 0;
  border-radius: 2px;
}

.page-about .why-grid {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
  max-width: 800px;
  margin: 0 auto;
}

.page-about .why-item {
  background: rgba(255,255,255,0.06);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.25rem;
  text-align: center;
  transition: background var(--transition), transform var(--transition);
}
.page-about .why-item:hover {
  background: rgba(255,255,255,0.11);
  transform: translateY(-2px);
}

.page-about .why-item__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--red-orange);
  color: var(--white-card);
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
  line-height: 1;
}

.page-about .why-item__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--white-card);
  margin: 0 0 0.35rem;
  letter-spacing: -0.01em;
}

.page-about .why-item__text {
  font-size: 0.9375rem;
  line-height: 1.55;
  color: rgba(255,255,255,0.78);
  margin: 0;
  max-width: 340px;
  margin-left: auto;
  margin-right: auto;
}

.page-about .why-section__cta {
  margin-top: 2rem;
}
.page-about .why-section__cta .btn {
  font-size: 0.9375rem;
  padding: 0.625rem 1.75rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  transition: transform var(--transition), background-color var(--transition), color var(--transition), border-color var(--transition);
  background-color: transparent;
  border: 2px solid var(--white-card);
  color: var(--white-card);
}
.page-about .why-section__cta .btn:hover {
  background-color: var(--white-card);
  color: var(--deep-blue);
  transform: translateY(-2px);
}
.page-about .why-section__cta .btn:focus-visible {
  outline: 2px solid var(--red-orange);
  outline-offset: 3px;
}

/* ===== 桌面端：1024px 及以上 ===== */
@media (min-width: 1024px) {
  .page-about {
    padding: 0 calc(var(--gap) * 2) 5rem;
  }
  .page-about .breadcrumb {
    padding: 1.75rem 0 1rem;
  }

  .page-about .about-split {
    flex-direction: row;
    gap: 3rem;
    align-items: flex-start;
  }

  .page-about .about-split__left {
    flex: 0 0 38%;
    max-width: 420px;
    align-items: flex-start;
    text-align: left;
    padding: 2rem 0 0;
    position: sticky;
    top: calc(var(--header-h) + 1.5rem);
  }

  .page-about .brand-graphic {
    margin-bottom: 2rem;
  }

  .page-about .about-title {
    font-size: 3.25rem;
  }

  .page-about .about-subtitle {
    margin-bottom: 1.75rem;
  }

  .page-about .about-text {
    max-width: 100%;
  }

  .page-about .about-links {
    justify-content: flex-start;
  }

  .page-about .about-split__right {
    flex: 1 1 0;
    min-width: 0;
    gap: 2rem;
  }

  .page-about .feature-card__content {
    padding: 1.5rem 1.5rem 1.75rem;
  }

  .page-about .feature-card--center .feature-card__content {
    padding-top: 1.75rem;
  }

  .page-about .feature-card__title {
    font-size: 1.375rem;
  }

  .page-about .why-section {
    margin-top: 4.5rem;
    padding: 3rem 2.5rem 3.5rem;
  }

  .page-about .why-grid {
    flex-direction: row;
    gap: 2rem;
    justify-content: center;
  }

  .page-about .why-item {
    flex: 1 1 0;
    min-width: 0;
    max-width: 280px;
    padding: 1.75rem 1.25rem;
  }

  .page-about .why-item__num {
    width: 52px;
    height: 52px;
    font-size: 1.375rem;
  }

  .page-about .why-section__cta {
    margin-top: 2.5rem;
  }
}

/* ===== 大桌面端：1280px+ 微调 ===== */
@media (min-width: 1280px) {
  .page-about .about-split__left {
    flex-basis: 35%;
    max-width: 460px;
  }

  .page-about .about-title {
    font-size: 3.75rem;
  }

  .page-about .feature-card__content {
    padding: 1.75rem 1.75rem 2rem;
  }

  .page-about .why-item {
    max-width: 320px;
    padding: 2rem 1.5rem;
  }
}

/* ===== 移动端安全区：防止溢出 ===== */
@media (max-width: 480px) {
  .page-about {
    padding: 0 0.75rem 3rem;
  }
  .page-about .brand-graphic {
    width: 160px;
    height: 160px;
  }
  .page-about .feature-card__content {
    padding: 1rem 1rem 1.25rem;
  }
  .page-about .why-section {
    padding: 1.75rem 1rem 2rem;
    border-radius: var(--radius-md);
  }
  .page-about .why-item {
    padding: 1.25rem 1rem;
  }
}