.page-about {
  --color-about-accent: #E53935;
  --color-about-secondary: #FFCA28;
  --color-about-bg-warm: #F5F0EB;
  --color-about-text: #212121;
  --color-about-text-light: #616161;
  --color-about-card-bg: rgba(255, 255, 255, 0.85);
  --color-about-card-border: rgba(229, 57, 53, 0.2);
  --color-about-back-bg: #212121;
  --color-about-back-text: #FFFFFF;
  --color-about-line: rgba(229, 57, 53, 0.3);
  --about-radius: 8px;
  --about-transition: 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- 面包屑 ---------- */
.page-about .about-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  font-size: 14px;
  font-family: var(--font-body);
  color: var(--color-about-text-light);
}

.page-about .about-breadcrumb a {
  color: var(--color-about-accent);
  text-decoration: none;
  transition: opacity var(--transition);
}

.page-about .about-breadcrumb a:hover {
  opacity: 0.75;
}

.page-about .about-breadcrumb__sep {
  color: var(--color-about-line);
  user-select: none;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  background: var(--color-about-bg-warm);
  padding: 48px 0 64px;
  position: relative;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-about-accent), var(--color-about-secondary), var(--color-about-accent));
  opacity: 0.6;
}

.page-about .about-hero__inner {
  display: flex;
  flex-direction: column;
  gap: 40px;
  align-items: flex-start;
}

.page-about .about-hero__text {
  flex: 1 1 100%;
}

.page-about .about-hero__title {
  font-family: var(--font-heading);
  font-size: 40px;
  font-weight: 700;
  line-height: 1.15;
  color: var(--color-about-text);
  margin: 0 0 16px;
  letter-spacing: -0.02em;
}

.page-about .about-hero__subtitle {
  font-size: 20px;
  line-height: 1.5;
  color: var(--color-about-text-light);
  margin: 0 0 12px;
  max-width: 580px;
}

.page-about .about-hero__desc {
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-about-text-light);
  margin: 0 0 28px;
  max-width: 560px;
}

.page-about .about-hero__action {
  display: inline-block;
  padding: 14px 36px;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--about-radius);
  background: var(--color-about-accent);
  color: #fff;
  text-decoration: none;
  transition: background var(--transition), transform var(--transition);
}

.page-about .about-hero__action:hover {
  background: #C62828;
  transform: translateY(-2px);
}

.page-about .about-hero__visual {
  flex: 0 0 auto;
  position: relative;
  width: 100%;
  max-width: 500px;
  margin: 0 auto;
}

.page-about .about-hero__svg {
  position: absolute;
  top: -20px;
  left: -20px;
  width: calc(100% + 40px);
  height: calc(100% + 40px);
  z-index: 1;
  pointer-events: none;
  opacity: 0.3;
}

.page-about .about-hero__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--about-radius);
  position: relative;
  z-index: 2;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}

/* ---------- 使命 ---------- */
.page-about .about-mission {
  padding: 64px 0 48px;
  background: #fff;
  position: relative;
}

.page-about .about-mission::after {
  content: '';
  display: block;
  width: 80px;
  height: 3px;
  background: var(--color-about-accent);
  margin: 32px auto 0;
  opacity: 0.5;
}

.page-about .about-mission__title {
  font-family: var(--font-heading);
  font-size: 32px;
  font-weight: 700;
  color: var(--color-about-text);
  margin: 0 0 24px;
  position: relative;
  padding-left: 20px;
  border-left: 4px solid var(--color-about-accent);
}

.page-about .about-mission__text {
  font-size: 18px;
  line-height: 1.8;
  color: var(--color-about-text-light);
  max-width: 720px;
  margin: 0;
}

/* ---------- 核心功能 ---------- */
.page-about .about-features {
  padding: 48px 0 64px;
  background: var(--color-about-bg-warm);
}

.page-about .about-features__title {
  font-family: var(--font-heading);
  font-size: 32px;
  font-weight: 700;
  color: var(--color-about-text);
  margin: 0 0 40px;
  text-align: center;
  position: relative;
}

.page-about .about-features__title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: var(--color-about-accent);
  margin: 12px auto 0;
  opacity: 0.4;
}

.page-about .about-features__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

/* 卡片翻转 */
.page-about .about-feature-card {
  position: relative;
  perspective: 800px;
  height: 240px;
  cursor: pointer;
  border-radius: var(--about-radius);
  background: transparent;
  transition: transform var(--about-transition);
}

.page-about .about-feature-card:focus-visible {
  outline: 2px solid var(--color-about-accent);
  outline-offset: 4px;
}

.page-about .about-feature-card__front,
.page-about .about-feature-card__back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: var(--about-radius);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  transition: transform var(--about-transition);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
}

.page-about .about-feature-card__front {
  background: var(--color-about-card-bg);
  border: 1px solid var(--color-about-card-border);
  transform: rotateY(0deg);
  backdrop-filter: blur(4px);
}

.page-about .about-feature-card__back {
  background: var(--color-about-back-bg);
  color: var(--color-about-back-text);
  transform: rotateY(180deg);
  font-size: 15px;
  line-height: 1.7;
}

.page-about .about-feature-card__back p {
  margin: 0;
}

.page-about .about-feature-card:hover .about-feature-card__front,
.page-about .about-feature-card:focus .about-feature-card__front {
  transform: rotateY(-180deg);
}

.page-about .about-feature-card:hover .about-feature-card__back,
.page-about .about-feature-card:focus .about-feature-card__back {
  transform: rotateY(0deg);
}

.page-about .about-feature-card__coord {
  font-family: var(--font-data);
  font-size: 48px;
  font-weight: 700;
  color: var(--color-about-accent);
  opacity: 0.15;
  line-height: 1;
  margin-bottom: 8px;
  user-select: none;
}

.page-about .about-feature-card__name {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-about-text);
  margin: 0 0 10px;
}

.page-about .about-feature-card__brief {
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-about-text-light);
  margin: 0;
}

/* ---------- 用户声音 ---------- */
.page-about .about-voices {
  padding: 64px 0;
  background: #fff;
}

.page-about .about-voices__title {
  font-family: var(--font-heading);
  font-size: 32px;
  font-weight: 700;
  color: var(--color-about-text);
  margin: 0 0 40px;
  text-align: center;
}

.page-about .about-voices__title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: var(--color-about-secondary);
  margin: 12px auto 0;
  opacity: 0.5;
}

.page-about .about-voices__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-voice-card {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
  background: var(--color-about-bg-warm);
  border-radius: var(--about-radius);
  overflow: hidden;
  transition: box-shadow var(--transition), transform var(--transition);
}

.page-about .about-voice-card:hover {
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
  transform: translateY(-4px);
}

.page-about .about-voice-card__img-wrap {
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: #e0d8cf;
}

.page-about .about-voice-card__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-voice-card__caption {
  padding: 0 20px 20px;
}

.page-about .about-voice-card__text {
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-about-text);
  margin: 0 0 8px;
  font-style: italic;
}

.page-about .about-voice-card__tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-about-accent);
  background: rgba(229, 57, 53, 0.08);
  padding: 4px 14px;
  border-radius: 20px;
  letter-spacing: 0.03em;
}

/* ---------- 联系方式 ---------- */
.page-about .about-location {
  padding: 64px 0 48px;
  background: var(--color-about-bg-warm);
}

.page-about .about-location__title {
  font-family: var(--font-heading);
  font-size: 32px;
  font-weight: 700;
  color: var(--color-about-text);
  margin: 0 0 40px;
  position: relative;
  padding-left: 20px;
  border-left: 4px solid var(--color-about-secondary);
}

.page-about .about-location__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

.page-about .about-location__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.page-about .about-location__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-location__label {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-about-text-light);
  opacity: 0.7;
}

.page-about .about-location__value {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-about-text);
  text-decoration: none;
  word-break: break-all;
}

.page-about .about-location__value a {
  color: var(--color-about-accent);
  text-decoration: none;
  transition: opacity var(--transition);
}

.page-about .about-location__value a:hover {
  opacity: 0.75;
}

.page-about .about-location__note {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-about-text-light);
  margin: 6px 0 0;
  max-width: 400px;
}

.page-about .about-location__map {
  border-radius: var(--about-radius);
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.page-about .about-location__map-img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 信任声明 ---------- */
.page-about .about-trust {
  padding: 24px 0 48px;
  background: #fff;
}

.page-about .about-trust__text {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-about-text-light);
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
  padding: 16px 24px;
  border-top: 1px solid var(--color-about-line);
  border-bottom: 1px solid var(--color-about-line);
}

/* ====== 桌面端 (min-width: 768px) ====== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 64px 0 80px;
  }

  .page-about .about-hero__inner {
    flex-direction: row;
    align-items: center;
    gap: 60px;
  }

  .page-about .about-hero__text {
    flex: 1 1 50%;
  }

  .page-about .about-hero__visual {
    flex: 0 0 45%;
    max-width: 520px;
  }

  .page-about .about-hero__title {
    font-size: 56px;
  }

  .page-about .about-hero__svg {
    opacity: 0.5;
  }

  .page-about .about-mission__title {
    font-size: 40px;
  }

  .page-about .about-features__title {
    font-size: 40px;
  }

  .page-about .about-features__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }

  .page-about .about-feature-card {
    height: 260px;
  }

  .page-about .about-voices__title {
    font-size: 40px;
  }

  .page-about .about-voices__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .page-about .about-voice-card {
    flex-direction: column;
  }

  .page-about .about-location__title {
    font-size: 40px;
  }

  .page-about .about-location__grid {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  .page-about .about-location__map {
    position: sticky;
    top: 88px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-features__grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-voices__grid {
    gap: 32px;
  }
}

/* ---------- 容器复用 ---------- */
.page-about .container {
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

@media (min-width: 768px) {
  .page-about .container {
    padding-left: 32px;
    padding-right: 32px;
  }
}