/* ===== 品牌档案专属样式 ===== */
.page-about {
  --ab-gold-fade: linear-gradient(90deg, transparent 0%, var(--gold-primary) 20%, var(--gold-primary) 80%, transparent 100%);
  --ab-dot-size: 14px;
  --ab-timeline-width: 3px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  color: var(--text-secondary);
  padding: 1rem 1.25rem 0;
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.5rem;
}
.page-about .breadcrumb a {
  color: var(--gold-primary);
  text-decoration: none;
  transition: color var(--transition);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--gold-bright);
  outline: 2px solid var(--gold-bright);
  outline-offset: 2px;
}
.page-about .breadcrumb__sep {
  color: var(--text-secondary);
  opacity: 0.5;
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--text-secondary);
  font-weight: 600;
}

/* ---------- 英雄区 ---------- */
.page-about .hero-panel {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.page-about .hero-panel__text {
  order: 2;
}
.page-about .hero-panel__kicker {
  font-family: var(--font-accent);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--gold-primary);
  margin: 0 0 0.75rem;
  line-height: 1.4;
}
.page-about .hero-panel__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 2.5rem;
  line-height: 1.12;
  color: var(--text-primary);
  margin: 0 0 1rem;
  letter-spacing: -0.01em;
}
.page-about .hero-panel__sub {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-secondary);
  margin: 0;
  max-width: 32em;
}
.page-about .hero-panel__media {
  order: 1;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-surface);
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
}
.page-about .hero-panel__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

/* ---------- 品牌定位 ---------- */
.page-about .positioning {
  background: var(--bg-surface);
  padding: 3rem 1.25rem;
}
.page-about .positioning__inner {
  max-width: var(--max-width);
  margin: 0 auto;
}
.page-about .positioning__title {
  margin-bottom: 1.5rem;
}
.page-about .positioning__body {
  max-width: 820px;
}
.page-about .positioning__statement {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  line-height: 1.5;
  color: var(--text-primary);
  font-weight: 600;
  margin: 0 0 1.25rem;
}
.page-about .gold-bar {
  height: 3px;
  width: 80px;
  background: var(--gold-primary);
  margin: 1.5rem 0;
  border-radius: 2px;
  transition: width 0.8s ease, opacity 0.8s ease;
}
.page-about .gold-bar[data-visible] {
  width: 160px;
}
.page-about .positioning__detail {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin: 0;
}

/* ---------- 核心功能 ---------- */
.page-about .capabilities {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.25rem;
}
.page-about .capabilities__title {
  margin-bottom: 1.5rem;
}
.page-about .capabilities__visual {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 2rem;
  background: var(--bg-surface);
  box-shadow: 0 6px 24px rgba(0,0,0,0.4);
}
.page-about .capabilities__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 4 / 3;
}
.page-about .capabilities__img-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(transparent, rgba(0,0,0,0.75));
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  padding: 2rem 1rem 0.75rem;
  text-align: right;
}
.page-about .capabilities__grid {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.page-about .cap-card {
  padding: 1.75rem 1.5rem;
  display: flex;
  flex-direction: column;
}
.page-about .cap-card__icon {
  font-family: var(--font-accent);
  font-size: 2rem;
  color: var(--gold-primary);
  line-height: 1;
  margin-bottom: 0.5rem;
  display: block;
}
.page-about .cap-card__title {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 0.5rem;
}
.page-about .cap-card__desc {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--text-secondary);
  margin: 0 0 1.25rem;
  flex: 1;
}
.page-about .cap-card__link {
  align-self: flex-start;
}

/* ---------- 版本时间轴 ---------- */
.page-about .milestones {
  background: var(--bg-surface);
  padding: 3rem 1.25rem;
}
.page-about .milestones__title {
  margin-bottom: 2rem;
}
.page-about .milestones__track {
  max-width: 680px;
  margin: 0 auto;
  position: relative;
  padding-left: 2rem;
}
.page-about .milestones__track::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 0;
  bottom: 0;
  width: var(--ab-timeline-width);
  background: var(--ab-gold-fade);
  background-size: 100% 100%;
  border-radius: 2px;
}
.page-about .milestone-node {
  margin-bottom: 1.75rem;
  position: relative;
}
.page-about .milestone-node:last-child {
  margin-bottom: 0;
}
.page-about .milestone-node__details {
  display: block;
}
.page-about .milestone-node__details[open] .milestone-node__body {
  animation: ab-fade-slide 0.35s ease forwards;
}
.page-about .milestone-node__head {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  padding: 0.5rem 0;
  user-select: none;
  transition: opacity var(--transition);
}
.page-about .milestone-node__head::-webkit-details-marker {
  display: none;
}
.page-about .milestone-node__head:hover,
.page-about .milestone-node__head:focus-visible {
  opacity: 0.85;
  outline: none;
}
.page-about .milestone-node__head:focus-visible {
  outline: 2px solid var(--gold-bright);
  outline-offset: 4px;
  border-radius: 2px;
}
.page-about .milestone-node__dot {
  flex-shrink: 0;
  width: var(--ab-dot-size);
  height: var(--ab-dot-size);
  border-radius: 50%;
  background: var(--gold-primary);
  border: 2px solid var(--bg-surface);
  box-shadow: 0 0 0 2px var(--gold-primary);
  transition: transform var(--transition), background var(--transition);
}
.page-about .milestone-node__details[open] .milestone-node__dot {
  background: var(--gold-bright);
  transform: scale(1.18);
}
.page-about .milestone-node__label {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.01em;
}
.page-about .milestone-node__body {
  padding: 0.75rem 0 0.25rem 2rem;
}
.page-about .milestone-node__body p {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin: 0;
}
@keyframes ab-fade-slide {
  0% { opacity: 0; transform: translateY(-6px); }
  100% { opacity: 1; transform: translateY(0); }
}

/* ---------- 联系我们 ---------- */
.page-about .contact-block {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.25rem;
}
.page-about .contact-block__title {
  margin-bottom: 1.5rem;
}
.page-about .contact-block__inner {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}
.page-about .contact-block__lead {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--text-primary);
  margin: 0 0 1rem;
  font-weight: 500;
}
.page-about .contact-block__list {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}
.page-about .contact-block__list li {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--text-secondary);
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.75rem;
}
.page-about .contact-block__tag {
  font-weight: 600;
  color: var(--gold-primary);
  min-width: 3em;
  display: inline-block;
}
.page-about .contact-block__note {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--text-secondary);
  opacity: 0.8;
  margin: 0 0 1.25rem;
  padding-left: 0.5rem;
  border-left: 2px solid var(--gold-primary);
}
.page-about .contact-block__cta {
  margin-top: 0.5rem;
}
.page-about .contact-block__media {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-surface);
  box-shadow: 0 4px 20px rgba(0,0,0,0.4);
  max-width: 400px;
}
.page-about .contact-block__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 1 / 1;
}

/* ---------- 桌面端增强 ---------- */
@media (min-width: 768px) {
  .page-about .breadcrumb {
    padding-left: 2rem;
    padding-right: 2rem;
  }

  /* 英雄区并排 */
  .page-about .hero-panel {
    flex-direction: row;
    align-items: center;
    gap: 2.5rem;
    padding: 2.5rem 2rem 3.5rem;
  }
  .page-about .hero-panel__text {
    order: 1;
    flex: 1 1 45%;
  }
  .page-about .hero-panel__media {
    order: 2;
    flex: 1 1 55%;
    max-width: 660px;
  }
  .page-about .hero-panel__title {
    font-size: 3.5rem;
  }
  .page-about .hero-panel__sub {
    font-size: 1.0625rem;
  }

  /* 品牌定位 */
  .page-about .positioning {
    padding: 4rem 2rem;
  }
  .page-about .positioning__statement {
    font-size: 1.5rem;
  }
  .page-about .gold-bar {
    width: 100px;
  }
  .page-about .gold-bar[data-visible] {
    width: 200px;
  }

  /* 核心功能网格 */
  .page-about .capabilities {
    padding: 4rem 2rem;
  }
  .page-about .capabilities__grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1.5rem;
  }
  .page-about .capabilities__visual {
    margin-bottom: 2.5rem;
  }
  .page-about .capabilities__img {
    aspect-ratio: 16 / 9;
  }

  /* 时间轴 */
  .page-about .milestones {
    padding: 4rem 2rem;
  }
  .page-about .milestones__track {
    padding-left: 2.5rem;
  }
  .page-about .milestone-node__label {
    font-size: 1.2rem;
  }

  /* 联系我们并排 */
  .page-about .contact-block {
    padding: 4rem 2rem;
  }
  .page-about .contact-block__inner {
    flex-direction: row;
    align-items: flex-start;
    gap: 3rem;
  }
  .page-about .contact-block__info {
    flex: 1 1 60%;
  }
  .page-about .contact-block__media {
    flex: 0 0 280px;
  }
}

@media (min-width: 1024px) {
  .page-about .breadcrumb {
    padding-left: 2.5rem;
    padding-right: 2.5rem;
  }
  .page-about .hero-panel {
    padding: 3rem 2.5rem 4rem;
    gap: 3.5rem;
  }
  .page-about .hero-panel__title {
    font-size: 4.25rem;
  }
  .page-about .positioning {
    padding: 5rem 2.5rem;
  }
  .page-about .positioning__statement {
    font-size: 1.75rem;
  }
  .page-about .capabilities {
    padding: 5rem 2.5rem;
  }
  .page-about .milestones {
    padding: 5rem 2.5rem;
  }
  .page-about .contact-block {
    padding: 5rem 2.5rem;
  }
  .page-about .contact-block__media {
    flex-basis: 340px;
  }
}

/* ---------- 过渡 & 滚动显现 ---------- */
.page-about [data-scroll-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.page-about [data-scroll-reveal][data-visible] {
  opacity: 1;
  transform: translateY(0);
}
.page-about .gold-bar[data-scroll-reveal] {
  transition: width 0.8s ease, opacity 0.8s ease, transform 0.6s ease;
}