.page-about {
  --about-hero-gap: 44px;
  --about-timeline-col-year: 96px;
  --about-timeline-dot-col: 22px;
  --about-timeline-gap: 16px;
  --about-gold-soft: rgba(201, 162, 39, 0.35);
  --about-red-soft: rgba(178, 34, 34, 0.28);
  background: var(--c-blue);
  color: var(--c-white);
  overflow-x: hidden;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about [data-reveal] {
  transition: opacity 0.5s ease, transform 0.5s ease;
}

/* ---------- 首屏海报 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 72px 0 40px;
  background:
    radial-gradient(ellipse at 82% 18%, rgba(201, 162, 39, 0.18), transparent 46%),
    linear-gradient(160deg, var(--c-blue-dark) 0%, var(--c-blue) 68%);
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

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

.page-about .about-hero__edition {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 22px 0 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--c-gold);
  text-transform: uppercase;
}

.page-about .about-hero__edition::before {
  content: "";
  width: 32px;
  height: 2px;
  background: var(--c-gold-grad);
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  font-family: var(--font-head);
  font-size: clamp(32px, 6vw, 58px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: 0.01em;
  color: var(--c-white);
}

.page-about .about-hero__line {
  display: block;
}

.page-about .about-hero__line:last-child {
  color: var(--c-gold);
}

.page-about .about-hero__lead {
  max-width: 560px;
  margin: 0 0 22px;
  font-size: 17px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.82);
}

.page-about .about-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-hero__media {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__frame {
  position: relative;
  margin: 0;
  border: var(--border-thick) solid var(--c-gold);
  box-shadow: 14px 14px 0 rgba(8, 16, 36, 0.68);
  background: var(--c-blue-dark);
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  right: -14px;
  bottom: -14px;
  width: 48px;
  height: 48px;
  border-right: 3px solid var(--c-red);
  border-bottom: 3px solid var(--c-red);
  pointer-events: none;
}

.page-about .about-hero__frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 4 / 5;
}

.page-about .about-hero__caption {
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.05em;
  color: rgba(255, 255, 255, 0.62);
  text-align: right;
}

.page-about .about-hero__flag-line {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin-top: 44px;
}

.page-about .about-hero__flag-line span {
  width: 20px;
  height: 28px;
  background: var(--c-gold);
  clip-path: polygon(0 0, 100% 0, 50% 100%);
}

.page-about .about-hero__flag-line span:nth-child(2n) {
  background: var(--c-red);
}

.page-about .about-hero__flag-line span:nth-child(3n) {
  background: rgba(255, 255, 255, 0.9);
}

/* ---------- 品牌定位 ---------- */
.page-about .about-profile {
  background: var(--c-cream);
  color: var(--c-blue-dark);
}

.page-about .about-profile__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  padding: 76px 0 64px;
}

.page-about .about-profile__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--c-gold);
}

.page-about .about-profile__intro h2 {
  margin: 0;
  font-family: var(--font-head);
  font-size: 28px;
  font-weight: 800;
  line-height: 1.3;
  border-left: 4px solid var(--c-gold);
  padding-left: 18px;
}

.page-about .about-profile__body p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(10, 31, 68, 0.86);
}

.page-about .about-profile__body p:last-child {
  margin-bottom: 0;
}

/* ---------- 里程碑时间轴 ---------- */
.page-about .about-milestones {
  background:
    linear-gradient(180deg, var(--c-blue-dark) 0%, var(--c-blue) 100%);
  padding: 76px 0 64px;
}

.page-about .about-milestones__header {
  margin-bottom: 48px;
}

.page-about .about-milestones__desc {
  max-width: 620px;
  margin: 0 0 20px;
  font-size: 16px;
  color: rgba(255, 255, 255, 0.78);
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 28px;
  left: 8px;
  width: 3px;
  background: linear-gradient(to bottom, var(--c-gold) 0%, var(--about-gold-soft) 100%);
  border-radius: 3px;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 44px 40px;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 12px;
}

.page-about .about-timeline__dot {
  position: absolute;
  top: 6px;
  left: 0;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--c-blue-dark);
  border: 3px solid var(--c-gold);
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-gold);
  margin-bottom: 8px;
}

.page-about .about-timeline__content h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 700;
  color: var(--c-white);
}

.page-about .about-timeline__content p {
  margin: 0;
  max-width: 620px;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.74);
}

.page-about .about-milestones__media {
  margin: 32px 0 0 40px;
  border: var(--border-med) solid var(--c-gold);
  box-shadow: var(--shadow-hard);
  background: var(--c-blue-dark);
}

.page-about .about-milestones__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 4 / 3;
}

.page-about .about-milestones__media figcaption {
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: rgba(255, 255, 255, 0.68);
  border-top: 1px solid rgba(255, 255, 255, 0.14);
}

/* ---------- 服务能力 ---------- */
.page-about .about-services {
  background: var(--c-cream);
  color: var(--c-blue-dark);
  padding: 76px 0 64px;
}

.page-about .about-services__header {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-bottom: 44px;
}

.page-about .about-services__desc {
  max-width: 640px;
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: rgba(10, 31, 68, 0.8);
}

.page-about .about-services__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .about-services__card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
  padding: 28px 24px;
  background: var(--c-blue);
  border: var(--border-med) solid var(--c-blue-dark);
  box-shadow: var(--shadow-hard);
  color: var(--c-white);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-about .about-services__card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-float);
}

.page-about .about-services__num {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  color: var(--c-gold);
  margin: 0;
}

.page-about .about-services__card h3 {
  margin: 0;
  font-family: var(--font-head);
  font-size: 24px;
  font-weight: 700;
  color: var(--c-white);
}

.page-about .about-services__text {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.82);
}

.page-about .about-services__card .btn {
  margin-top: auto;
}

/* ---------- 资质认证 ---------- */
.page-about .about-credential {
  background: var(--c-blue-dark);
  padding: 76px 0 64px;
}

.page-about .about-credential__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-about .about-credential__media {
  margin: 0;
}

.page-about .about-credential__frame {
  position: relative;
  margin: 0;
  border: var(--border-thick) solid var(--c-gold);
  box-shadow: var(--shadow-hard);
}

.page-about .about-credential__frame::before {
  content: "";
  position: absolute;
  inset: 12px;
  border: 1px solid rgba(201, 162, 39, 0.45);
  pointer-events: none;
  z-index: 1;
}

.page-about .about-credential__frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 1 / 1;
}

.page-about .about-credential__caption {
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  text-align: right;
  color: rgba(255, 255, 255, 0.6);
}

.page-about .about-credential__content .section-title {
  margin-top: 0;
}

.page-about .about-credential__intro {
  max-width: 600px;
  margin: 16px 0 8px;
  font-size: 16px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.8);
}

.page-about .about-credential__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
}

.page-about .about-credential__list li {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}

.page-about .about-credential__list li:last-child {
  border-bottom: none;
}

.page-about .about-credential__badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.2;
  text-align: center;
  color: var(--c-blue-dark);
  background: var(--c-gold-grad);
  border-radius: var(--radius-sm);
  box-shadow: 4px 4px 0 rgba(178, 34, 34, 0.6);
}

.page-about .about-credential__list h3 {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  color: var(--c-white);
}

.page-about .about-credential__list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.68;
  color: rgba(255, 255, 255, 0.74);
}

/* ---------- 团队与组织 ---------- */
.page-about .about-team {
  background: var(--c-cream);
  color: var(--c-blue-dark);
  padding: 76px 0 64px;
}

.page-about .about-team__inner {
  max-width: 920px;
  margin: 0 auto;
}

.page-about .about-team__header {
  margin-bottom: 36px;
}

.page-about .about-team__index {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--c-gold);
}

.page-about .about-team__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-bottom: 40px;
}

.page-about .about-team__stat {
  padding: 24px 20px;
  background: var(--c-white);
  border-left: 4px solid var(--c-gold);
  box-shadow: 6px 6px 0 rgba(10, 31, 68, 0.18);
}

.page-about .about-team__number {
  display: block;
  font-family: var(--font-head);
  font-size: 40px;
  font-weight: 900;
  line-height: 1.1;
  color: var(--c-blue);
}

.page-about .about-team__label {
  display: block;
  margin-top: 8px;
  font-size: 15px;
  color: rgba(10, 31, 68, 0.76);
}

.page-about .about-team__desc {
  margin: 0 0 28px;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(10, 31, 68, 0.86);
}

.page-about .about-team__links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- 底部行动区 ---------- */
.page-about .about-cta {
  background: var(--c-blue);
  padding: 72px 0 80px;
}

.page-about .about-cta__box {
  position: relative;
  text-align: center;
  padding: 48px 24px;
  border: var(--border-thick) solid var(--c-gold);
  box-shadow: var(--shadow-hard);
  background:
    linear-gradient(140deg, rgba(201, 162, 39, 0.14), transparent 60%),
    var(--c-blue-dark);
  overflow: hidden;
}

.page-about .about-cta__box::before {
  content: "";
  position: absolute;
  top: -40px;
  right: -40px;
  width: 140px;
  height: 140px;
  background: var(--c-red);
  opacity: 0.16;
  transform: rotate(45deg);
}

.page-about .about-cta__box h2 {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: 28px;
  font-weight: 800;
  color: var(--c-white);
}

.page-about .about-cta__box p {
  margin: 0 auto 28px;
  max-width: 560px;
  font-size: 16px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.78);
}

.page-about .about-cta__actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- 桌面端适配 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 64px;
    align-items: center;
  }

  .page-about .about-hero h1 {
    font-size: 58px;
  }

  .page-about .about-hero__frame img {
    aspect-ratio: 4 / 5;
    max-height: 640px;
  }

  .page-about .about-profile__grid {
    grid-template-columns: 0.8fr 1.2fr;
    gap: 80px;
    align-items: center;
    padding: 88px 0 72px;
  }

  .page-about .about-profile__intro h2 {
    font-size: 34px;
  }

  .page-about .about-milestones {
    padding: 88px 0 72px;
  }

  .page-about .about-timeline {
    margin-left: 0;
  }

  .page-about .about-timeline::before {
    left: calc(var(--about-timeline-col-year) + var(--about-timeline-gap) + var(--about-timeline-dot-col) / 2);
    transform: translateX(-50%);
  }

  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: var(--about-timeline-col-year) var(--about-timeline-dot-col) 1fr;
    column-gap: var(--about-timeline-gap);
    align-items: start;
    padding-left: 0;
    padding-bottom: 52px;
  }

  .page-about .about-timeline__dot {
    position: relative;
    top: 6px;
    left: auto;
    width: 16px;
    height: 16px;
  }

  .page-about .about-timeline__year {
    margin-bottom: 0;
    padding-top: 2px;
    text-align: right;
  }

  .page-about .about-milestones__media {
    margin-left: calc(var(--about-timeline-col-year) + var(--about-timeline-gap) + var(--about-timeline-dot-col) + var(--about-timeline-gap));
    max-width: 520px;
  }

  .page-about .about-services__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
  }

  .page-about .about-credential__grid {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 72px;
    align-items: center;
  }

  .page-about .about-credential__frame {
    max-width: 400px;
  }

  .page-about .about-team {
    padding: 88px 0 72px;
  }

  .page-about .about-team__stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
  }

  .page-about .about-team__number {
    font-size: 48px;
  }

  .page-about .about-cta__box {
    padding: 60px 48px;
  }

  .page-about .about-cta__box h2 {
    font-size: 34px;
  }
}