.page-about {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

/* ===== 首屏：分屏叙事 ===== */
.page-about .about-hero {
  position: relative;
  padding: var(--space-5) 0 var(--space-6);
  background:
    radial-gradient(circle at 85% 15%, rgba(212, 175, 55, 0.14), transparent 30%),
    linear-gradient(135deg, var(--clr-off-white) 0%, #eef1f6 60%, rgba(11, 29, 58, 0.04) 100%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: var(--space-4);
  align-items: center;
}

.page-about .about-hero__content {
  position: relative;
  z-index: 2;
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  margin-bottom: 1.25rem;
  font-size: 0.875rem;
  color: var(--clr-gray);
}

.page-about .breadcrumbs a {
  color: var(--clr-blue);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover {
  color: var(--clr-deep);
  text-decoration: underline;
}

.page-about .breadcrumbs__sep {
  color: var(--clr-muted-gold);
}

.page-about .about-hero .eyebrow {
  margin-bottom: 0.75rem;
}

.page-about .about-hero h1 {
  margin-top: 0;
  margin-bottom: 1rem;
  font-family: var(--font-heading);
  font-size: clamp(1.85rem, 4vw, 2.6rem);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--clr-deep);
  max-width: 14em;
}

.page-about .about-hero__lead {
  margin: 0 0 1.5rem;
  max-width: 36em;
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--clr-ink);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  margin: 0;
  padding: 1.125rem 1.25rem;
  border-left: 4px solid var(--clr-orange);
  background: rgba(255, 255, 255, 0.75);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  max-width: 38em;
}

.page-about .about-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.page-about .about-hero__fact dt {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--clr-gray);
}

.page-about .about-hero__fact dd {
  margin: 0;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 900;
  color: var(--clr-deep);
}

.page-about .about-hero__visual {
  position: relative;
}

.page-about .about-hero__visual .frame {
  border-radius: var(--radius-lg);
  transform: rotate(1.5deg);
  box-shadow: 0 24px 50px rgba(11, 29, 58, 0.22);
}

.page-about .about-hero__badge {
  position: absolute;
  right: -10px;
  bottom: 24px;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 1rem 1.25rem;
  background: var(--clr-deep);
  border: 2px solid var(--clr-gold);
  border-radius: var(--radius-md);
  box-shadow: 0 12px 24px rgba(11, 29, 58, 0.3);
  transform: rotate(-3deg);
}

.page-about .about-hero__badge-num {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 900;
  color: var(--clr-gold);
  line-height: 1;
}

.page-about .about-hero__badge-txt {
  font-size: 0.8125rem;
  color: var(--clr-off-white);
}

.page-about .about-hero__sheet {
  position: absolute;
  z-index: -1;
  display: block;
  background: rgba(212, 175, 55, 0.16);
  border: 2px dashed rgba(212, 175, 55, 0.45);
  border-radius: var(--radius-md);
}

.page-about .about-hero__sheet--one {
  top: -20px;
  right: -14px;
  width: 90px;
  height: 90px;
  transform: rotate(12deg);
}

.page-about .about-hero__sheet--two {
  bottom: 60px;
  left: -18px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
}

/* ===== 品牌档案 ===== */
.page-about .about-profile {
  padding: var(--space-5) 0;
  background: var(--clr-deep);
  color: var(--clr-off-white);
}

.page-about .about-profile .eyebrow {
  color: var(--clr-gold);
}

.page-about .about-profile .section-title {
  color: var(--clr-off-white);
}

.page-about .about-profile__heading {
  margin-bottom: var(--space-4);
  max-width: 24em;
}

.page-about .about-profile__grid {
  gap: var(--space-5);
}

.page-about .about-profile__text {
  color: rgba(245, 247, 250, 0.92);
}

.page-about .about-profile__text p {
  margin: 0 0 1rem;
  line-height: 1.75;
}

.page-about .about-profile__points {
  margin: 1.25rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.625rem;
}

.page-about .about-profile__points li {
  position: relative;
  padding-left: 1.5rem;
  line-height: 1.6;
}

.page-about .about-profile__points li::before {
  content: '';
  position: absolute;
  top: 0.55em;
  left: 0;
  width: 9px;
  height: 9px;
  background: var(--clr-gold);
  transform: rotate(45deg);
}

.page-about .about-profile__stats {
  display: grid;
  gap: 1rem;
  align-content: center;
}

.page-about .about-profile__stat {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  padding: 1.25rem 1.5rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(212, 175, 55, 0.35);
  border-left: 6px solid var(--clr-gold);
  border-radius: var(--radius-md);
}

.page-about .about-profile__stat .score-number {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 900;
  line-height: 1;
  color: var(--clr-gold);
  white-space: nowrap;
}

.page-about .about-profile__stat-label {
  font-size: 0.9375rem;
  color: rgba(245, 247, 250, 0.75);
}

/* ===== 发展里程碑 ===== */
.page-about .about-milestones {
  padding: var(--space-5) 0;
  background: var(--clr-off-white);
}

.page-about .about-milestones__media {
  margin: var(--space-3) 0 var(--space-4);
}

.page-about .about-milestones__media .frame {
  border-radius: var(--radius-lg);
  box-shadow: 0 16px 36px rgba(11, 29, 58, 0.14);
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
}

.page-about .about-timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 27px;
  width: 3px;
  background: linear-gradient(to bottom, var(--clr-gold), var(--clr-blue));
  border-radius: 999px;
  opacity: 0.5;
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: var(--space-3);
}

.page-about .about-timeline__marker {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  background: var(--clr-deep);
  border: 3px solid var(--clr-gold);
  border-radius: 50%;
  box-shadow: 0 0 0 4px var(--clr-off-white), 0 8px 20px rgba(11, 29, 58, 0.18);
}

.page-about .about-timeline__num {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 900;
  color: var(--clr-gold);
  letter-spacing: 0.04em;
}

.page-about .about-timeline__card {
  background: #ffffff;
  border: 1px solid rgba(212, 175, 55, 0.28);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-3);
  box-shadow: 0 4px 16px rgba(11, 29, 58, 0.07);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.page-about .about-timeline__item:hover .about-timeline__card {
  transform: translateX(6px);
  border-color: var(--clr-gold);
  box-shadow: 0 8px 24px rgba(212, 175, 55, 0.22);
}

.page-about .about-timeline__card h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-heading);
  font-size: 1.125rem;
  color: var(--clr-deep);
}

.page-about .about-timeline__card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--clr-gray);
}

/* ===== 服务承诺 ===== */
.page-about .about-promises {
  padding: var(--space-5) 0;
  background:
    linear-gradient(120deg, rgba(11, 29, 58, 0.04) 0%, transparent 40%),
    #fff;
}

.page-about .about-promises__grid {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-3);
}

.page-about .about-promises__item {
  position: relative;
  padding: var(--space-4) var(--space-3);
  background: var(--clr-off-white);
  border-radius: var(--radius-lg);
  border: 1px solid #e4e8ee;
  overflow: hidden;
}

.page-about .about-promises__item::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--clr-gold), var(--clr-orange));
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.page-about .about-promises__icon {
  display: flex;
  align-items: baseline;
  gap: 0.3rem;
  margin-bottom: 1rem;
  font-family: var(--font-heading);
}

.page-about .about-promises__icon-num {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
  background: linear-gradient(135deg, var(--clr-gold), var(--clr-orange));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-promises__icon-unit {
  font-size: 0.875rem;
  font-weight: 900;
  color: var(--clr-blue);
}

.page-about .about-promises__icon-symbol {
  font-size: 3rem;
  line-height: 1;
  background: linear-gradient(135deg, var(--clr-gold), var(--clr-orange));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-promises__item h3 {
  margin: 0 0 0.6rem;
  font-family: var(--font-heading);
  font-size: 1.1875rem;
  color: var(--clr-deep);
}

.page-about .about-promises__item p {
  margin: 0 0 1rem;
  line-height: 1.7;
  color: var(--clr-ink);
  font-size: 0.9375rem;
}

.page-about .about-promises__link {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--clr-blue);
  text-decoration: none;
}

.page-about .about-promises__link:hover {
  color: var(--clr-orange);
}

/* ===== 资质与合作 ===== */
.page-about .about-certifications {
  padding: var(--space-5) 0 var(--space-6);
  background: var(--clr-ink);
  color: var(--clr-off-white);
}

.page-about .about-certifications__grid {
  gap: var(--space-5);
  align-items: center;
}

.page-about .about-certifications__content .eyebrow {
  color: var(--clr-gold);
}

.page-about .about-certifications__content .section-title {
  color: var(--clr-off-white);
}

.page-about .about-certifications__lead {
  margin: 0 0 1.5rem;
  line-height: 1.75;
  color: rgba(245, 247, 250, 0.85);
}

.page-about .about-certifications__list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin: 0 0 1.75rem;
  padding: 0;
  list-style: none;
}

.page-about .about-certifications__item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  padding: 0.875rem 1rem;
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--clr-gold);
}

.page-about .about-certifications__item .tag {
  background: rgba(212, 175, 55, 0.14);
  color: var(--clr-gold);
  border: 1px solid rgba(212, 175, 55, 0.3);
}

.page-about .about-certifications__item span:last-child {
  color: rgba(245, 247, 250, 0.88);
}

.page-about .about-certifications__cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.25rem;
}

.page-about .about-certifications__link {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--clr-gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(212, 175, 55, 0.4);
  padding-bottom: 2px;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .about-certifications__link:hover {
  color: var(--clr-orange);
  border-color: var(--clr-orange);
}

.page-about .about-certifications__visual .frame {
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 46px rgba(0, 0, 0, 0.32);
}

/* ===== 响应式：平板与桌面 ===== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: var(--space-5) 0 var(--space-6);
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 4fr);
    gap: var(--space-5);
  }

  .page-about .about-profile__stat {
    justify-content: space-between;
  }
}

@media (min-width: 800px) {
  .page-about .about-promises__grid {
    grid-template-columns: repeat(12, 1fr);
  }

  .page-about .about-promises__item:nth-child(1) {
    grid-column: 1 / 6;
  }

  .page-about .about-promises__item:nth-child(2) {
    grid-column: 6 / 13;
    transform: translateY(24px);
  }

  .page-about .about-promises__item:nth-child(3) {
    grid-column: 1 / 13;
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--space-4);
    align-items: center;
  }

  .page-about .about-promises__item:nth-child(3) .about-promises__icon {
    grid-column: 1;
    grid-row: 1 / 4;
    align-self: center;
    margin-bottom: 0;
  }

  .page-about .about-promises__item:nth-child(3) h3 {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-promises__item:nth-child(3) p {
    grid-column: 2;
    grid-row: 2;
    margin-bottom: 0;
  }

  .page-about .about-promises__item:nth-child(3) .about-promises__link {
    grid-column: 2;
    grid-row: 3;
  }
}

@media (min-width: 900px) {
  .page-about .about-timeline {
    grid-template-columns: repeat(5, 1fr);
    gap: var(--space-3);
  }

  .page-about .about-timeline::before {
    top: 27px;
    bottom: auto;
    left: 0;
    right: 0;
    width: auto;
    height: 3px;
    background: linear-gradient(to right, var(--clr-gold), var(--clr-blue));
    opacity: 0.55;
  }

  .page-about .about-timeline__item {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
    grid-template-columns: none;
  }

  .page-about .about-timeline__marker {
    margin: 0 auto;
  }

  .page-about .about-timeline__card {
    height: 100%;
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  }

  .page-about .about-timeline__item:hover .about-timeline__card {
    transform: translateY(-4px);
  }

  .page-about .about-certifications__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 4fr);
    gap: var(--space-6);
  }
}

@media (min-width: 1024px) {
  .page-about .about-profile__heading {
    margin-bottom: var(--space-5);
  }

  .page-about .about-profile__grid {
    gap: var(--space-6);
  }

  .page-about .about-milestones,
  .page-about .about-promises,
  .page-about .about-certifications {
    padding: var(--space-6) 0;
  }
}