.page-about {
  --about-content-max: 820px;
  --about-gap: 2rem;
  --about-section-spacing: 4.5rem;
  --about-card-radius: 12px;
  --about-transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  background: linear-gradient(165deg, var(--color-deep-space) 0%, var(--color-deep-blue) 70%, #132a4a 100%);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
  padding: 0 var(--content-padding) 3rem;
  min-height: 60vh;
  position: relative;
  overflow-x: hidden;
}

/* 面包屑 */
.page-about .breadcrumb {
  max-width: var(--content-max-width);
  margin: 0 auto 2rem;
  padding-top: 1.25rem;
  font-size: clamp(0.8rem, 1.2vw, 0.95rem);
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}
.page-about .breadcrumb a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--about-transition);
}
.page-about .breadcrumb a:hover {
  border-color: var(--color-accent);
}
.page-about .breadcrumb__sep {
  color: var(--color-medium-steel);
  user-select: none;
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--color-text-primary);
  font-weight: 600;
}

/* ===== 品牌定位 (Hero) ===== */
.page-about .about-hero {
  max-width: var(--content-max-width);
  margin: 0 auto var(--about-section-spacing);
}
.page-about .about-hero__inner {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  align-items: center;
}
.page-about .about-hero__text {
  flex: 1 1 55%;
  order: 1;
}
.page-about .about-hero__brand {
  margin-bottom: 1.2rem;
}
.page-about .about-hero__logo {
  display: block;
  max-width: 120px;
  height: auto;
  object-fit: contain;
}
.page-about .about-hero__title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(2.6rem, 7vw, 4.8rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--color-white);
  margin: 0 0 1rem;
  background: linear-gradient(135deg, var(--color-white) 40%, var(--color-fluorescent-green) 90%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: none;
}
.page-about .about-hero__desc {
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  color: var(--color-text-secondary);
  max-width: 62ch;
  margin: 0 0 1.6rem;
  line-height: 1.7;
}
.page-about .about-hero__note {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: rgba(0, 255, 132, 0.08);
  border-left: 3px solid var(--color-fluorescent-green);
  padding: 0.8rem 1.4rem;
  border-radius: 0 8px 8px 0;
  backdrop-filter: blur(4px);
}
.page-about .about-hero__note-number {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.8rem;
  color: var(--color-fluorescent-green);
  line-height: 1;
}
.page-about .about-hero__note-label {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.02em;
}
.page-about .about-hero__visual {
  flex: 1 1 40%;
  order: 2;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}
.page-about .about-hero__image {
  max-width: 100%;
  height: auto;
  object-fit: contain;
  border-radius: var(--about-card-radius);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
  transition: transform var(--about-transition), box-shadow var(--about-transition);
}
.page-about .about-hero__image:hover {
  transform: scale(1.01);
  box-shadow: 0 16px 56px rgba(0, 255, 132, 0.08);
}

/* ===== 平台优势 ===== */
.page-about .about-advantages {
  max-width: var(--content-max-width);
  margin: 0 auto var(--about-section-spacing);
  position: relative;
}
.page-about .about-advantages__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.15;
  color: var(--color-white);
  margin: 0 0 0.5rem;
  letter-spacing: -0.01em;
}
.page-about .about-advantages__intro {
  font-size: clamp(0.95rem, 1.4vw, 1.1rem);
  color: var(--color-text-secondary);
  max-width: 56ch;
  margin: 0 0 2.5rem;
  line-height: 1.6;
}
.page-about .about-advantages__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}
.page-about .about-advantage-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--about-card-radius);
  padding: 1.8rem 1.6rem;
  position: relative;
  transition: background var(--about-transition), border-color var(--about-transition), transform var(--about-transition);
  cursor: default;
}
.page-about .about-advantage-card:hover {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(0, 255, 132, 0.15);
  transform: translateY(-3px);
}
.page-about .about-advantage-card__number {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(2rem, 4vw, 2.8rem);
  line-height: 1;
  color: var(--num-color, var(--color-fluorescent-green));
  margin-bottom: 0.6rem;
  display: inline-block;
  background: linear-gradient(135deg, var(--num-color, var(--color-fluorescent-green)) 30%, rgba(255,255,255,0.5) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.page-about .about-advantage-card__heading {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: clamp(1.05rem, 1.8vw, 1.3rem);
  color: var(--color-white);
  margin: 0 0 0.4rem;
}
.page-about .about-advantage-card__brief {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.5;
}
.page-about .about-advantage-card__extra {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height var(--about-transition), opacity var(--about-transition), padding var(--about-transition);
}
.page-about .about-advantage-card:hover .about-advantage-card__extra {
  max-height: 120px;
  opacity: 1;
  padding-top: 0.75rem;
}
.page-about .about-advantage-card__extra-line {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.page-about .about-advantage-card__extra-line::before {
  content: "—";
  color: var(--color-gold);
  font-weight: 300;
}
.page-about .about-advantages__visual {
  margin: 2rem 0 1.5rem;
  display: flex;
  justify-content: center;
}
.page-about .about-advantages__image {
  max-width: 100%;
  height: auto;
  object-fit: contain;
  border-radius: var(--about-card-radius);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}
.page-about .about-advantages__cta {
  text-align: right;
}

/* ===== 通用链接样式 ===== */
.page-about .about-link {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: clamp(0.9rem, 1.2vw, 1rem);
  color: var(--color-fluorescent-green);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 255, 132, 0.3);
  padding-bottom: 2px;
  transition: border-color var(--about-transition), color var(--about-transition), transform var(--about-transition);
}
.page-about .about-link:hover {
  border-bottom-color: var(--color-fluorescent-green);
  color: var(--color-white);
  transform: translateX(4px);
}
.page-about .about-link--alt {
  color: var(--color-gold);
  border-bottom-color: rgba(245, 176, 65, 0.3);
}
.page-about .about-link--alt:hover {
  border-bottom-color: var(--color-gold);
  color: var(--color-white);
}

/* ===== 我们的承诺 ===== */
.page-about .about-commitment {
  max-width: var(--content-max-width);
  margin: 0 auto;
  position: relative;
  padding-top: 0.5rem;
}
.page-about .about-commitment__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.15;
  color: var(--color-white);
  margin: 0 0 2rem;
  letter-spacing: -0.01em;
}
.page-about .about-commitment__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}
.page-about .about-commitment__item {
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--about-card-radius);
  padding: 1.8rem 1.6rem;
  border-left: 3px solid var(--color-gold);
  transition: background var(--about-transition);
}
.page-about .about-commitment__item:hover {
  background: rgba(255, 255, 255, 0.06);
}
.page-about .about-commitment__icon {
  display: inline-block;
  font-size: 1.4rem;
  color: var(--color-gold);
  margin-bottom: 0.4rem;
}
.page-about .about-commitment__heading {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  color: var(--color-white);
  margin: 0 0 0.5rem;
}
.page-about .about-commitment__text {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.6;
  max-width: 58ch;
}
.page-about .about-commitment__contact {
  margin-top: 2.5rem;
  padding: 1.5rem 1.6rem;
  background: rgba(0, 255, 132, 0.04);
  border: 1px dashed rgba(0, 255, 132, 0.12);
  border-radius: var(--about-card-radius);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.page-about .about-commitment__contact-text {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin: 0;
  flex: 1 1 240px;
}
.page-about .about-commitment__line {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-gold), var(--color-fluorescent-green), transparent);
  margin-top: 3rem;
  opacity: 0.3;
}

/* ===== 桌面端媒体查询 ===== */
@media (min-width: 768px) {
  .page-about {
    padding: 0 var(--content-padding) 4rem;
    --about-section-spacing: 5.5rem;
    --about-gap: 2.5rem;
  }
  .page-about .breadcrumb {
    padding-top: 1.5rem;
    margin-bottom: 3rem;
  }

  /* Hero 双栏布局 */
  .page-about .about-hero__inner {
    flex-direction: row;
    align-items: stretch;
    gap: 3rem;
  }
  .page-about .about-hero__text {
    order: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
  .page-about .about-hero__visual {
    order: 2;
    width: auto;
    flex-shrink: 0;
  }
  .page-about .about-hero__image {
    width: 500px;
    max-width: 100%;
  }
  .page-about .about-hero__title {
    font-size: clamp(3.2rem, 6vw, 4.8rem);
  }

  /* 优势卡片三列 */
  .page-about .about-advantages__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.8rem;
  }
  .page-about .about-advantage-card {
    padding: 2rem 1.8rem;
  }

  /* 承诺双栏 */
  .page-about .about-commitment__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
  }
  .page-about .about-commitment__item {
    padding: 2rem 2rem;
  }
  .page-about .about-commitment__contact {
    padding: 1.8rem 2rem;
  }
}

@media (min-width: 1024px) {
  .page-about {
    --about-section-spacing: 6.5rem;
  }
  .page-about .about-hero__inner {
    gap: 4rem;
  }
  .page-about .about-hero__image {
    width: 500px;
  }
  .page-about .about-advantages__grid {
    gap: 2rem;
  }
}

/* ===== 微动效 ===== */
.page-about .about-hero__title {
  transition: letter-spacing var(--about-transition);
}
.page-about .about-hero__title:hover {
  letter-spacing: 0.01em;
}
.page-about .about-advantage-card__number {
  transition: transform var(--about-transition);
}
.page-about .about-advantage-card:hover .about-advantage-card__number {
  transform: scale(1.04);
}
.page-about .about-commitment__icon {
  transition: transform var(--about-transition), color var(--about-transition);
}
.page-about .about-commitment__item:hover .about-commitment__icon {
  transform: scale(1.15);
  color: var(--color-fluorescent-green);
}

.page-about {
  --num-color: transparent;
}