/* ===== 品牌档案页（page-about）===== */
.page-about {
  --about-accent: var(--color-accent);
  --about-silver: var(--color-silver);
  --about-bg-deep: var(--color-bg-deep);
  --about-bg-card: var(--color-bg-card);
  --about-border: var(--color-border);
  --about-radius-lg: var(--radius-lg);
  --about-radius-md: var(--radius-md);
  --about-ease: var(--ease);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about__breadcrumb {
  margin: 24px auto 0;
  max-width: 1180px;
  padding: 0 20px;
}
.page-about__breadcrumb .breadcrumb__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
}
.page-about__breadcrumb .breadcrumb__item {
  color: var(--color-text-dim);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
}
.page-about__breadcrumb .breadcrumb__item + .breadcrumb__item::before {
  content: "·";
  margin-right: 8px;
  color: var(--color-accent);
}
.page-about__breadcrumb a {
  color: var(--color-silver);
  text-decoration: none;
  transition: color 0.2s var(--about-ease);
}
.page-about__breadcrumb a:hover {
  color: var(--color-accent);
}
.page-about__breadcrumb [aria-current="page"] {
  color: var(--color-text);
}

/* ---------- 首屏 ---------- */
.page-about__hero {
  position: relative;
  display: grid;
  gap: 24px;
  grid-template-columns: 1fr;
  align-items: end;
  max-width: 1180px;
  margin: 32px auto 0;
  padding: 0 20px;
}
.page-about__hero-left {
  position: relative;
  z-index: 1;
}
.page-about__hero-left .section-label {
  margin-bottom: 14px;
  color: var(--color-accent);
}
.page-about__hero-title {
  margin: 0 0 18px;
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.12;
}
.page-about__hero-title-accent {
  color: var(--color-silver);
  display: block;
  font-size: 0.58em;
  font-weight: 500;
  letter-spacing: 0.02em;
  margin-top: 10px;
  text-transform: none;
}
.page-about__hero-lede {
  margin: 0 0 22px;
  max-width: 620px;
  font-family: var(--font-editorial);
  font-size: 1.02rem;
  color: var(--color-text);
  line-height: 1.7;
}
.page-about__hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about__hero-pill {
  background: transparent;
  border: 1px solid var(--about-border);
  color: var(--color-text);
}
.page-about__hero-pill.pill--accent {
  border-color: var(--color-accent);
}
.page-about__hero-side {
  position: relative;
  display: grid;
  gap: 12px;
}
.page-about__side-label {
  margin: 0;
  color: var(--color-text-dim);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.page-about__hero-index {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  border-left: 2px solid var(--about-border);
}
.page-about__hero-index li {
  margin-left: 16px;
  padding: 4px 0;
}
.page-about__hero-index a {
  color: var(--color-silver);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  transition: color 0.2s var(--about-ease);
}
.page-about__hero-index a:hover {
  color: var(--color-accent);
}
.page-about__hero-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--about-radius-lg);
  border: 1px solid var(--about-border);
  object-fit: cover;
  aspect-ratio: 16 / 9;
  margin-top: 8px;
}

/* ---------- 主体布局 ---------- */
.page-about__layout {
  max-width: 1180px;
  margin: 0 auto;
  padding: 32px 20px 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

/* 侧边目录 */
.page-about__aside {
  display: none;
}
@media (min-width: 960px) {
  .page-about__layout {
    grid-template-columns: 220px 1fr;
    gap: 56px;
    align-items: start;
  }
  .page-about__aside {
    display: block;
    position: sticky;
    top: 90px;
  }
  .page-about__toc {
    border-left: 1px solid var(--about-border);
    padding-left: 22px;
  }
  .page-about__toc-list {
    list-style: none;
    margin: 14px 0 0;
    padding: 0;
    display: grid;
    gap: 12px;
  }
  .page-about__toc-list li {
    margin: 0;
  }
  .page-about__toc-list a {
    display: flex;
    align-items: baseline;
    gap: 10px;
    text-decoration: none;
    color: var(--color-text-dim);
    font-size: 0.9rem;
    transition: color 0.2s var(--about-ease);
  }
  .page-about__toc-list a:hover {
    color: var(--color-accent);
  }
  .page-about__toc-num {
    color: var(--color-accent);
    font-family: var(--font-data);
    font-size: 0.72rem;
  }
  .page-about__toc-tip {
    margin: 20px 0 0;
    color: var(--color-text-dim);
    font-size: 0.75rem;
    line-height: 1.6;
  }
}

/* 右侧章节 */
.page-about__chapters {
  display: grid;
  gap: 56px;
}
.page-about__chapter {
  position: relative;
}
.page-about__chapter + .page-about__chapter {
  border-top: 1px solid var(--about-border);
  padding-top: 40px;
}
.page-about__chapter .chapter-block__header {
  display: grid;
  gap: 4px;
}
.page-about__chapter .chapter-block__title {
  margin: 0;
  font-size: 1.7rem;
  letter-spacing: 0.02em;
}
.page-about__chapter .chapter-block__desc > .page-about__chapter-lead {
  font-family: var(--font-editorial);
  color: var(--color-silver);
  font-size: 1.05rem;
  line-height: 1.7;
  margin-top: 10px;
}

/* ---------- 01 品牌档案 ---------- */
.page-about__brand-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 20px;
}
@media (min-width: 640px) {
  .page-about__brand-grid {
    grid-template-columns: 1fr 1fr;
  }
}
.page-about__brand-card {
  background: var(--about-bg-card);
  border-radius: var(--about-radius-md);
  padding: 18px 18px 20px;
  border: 1px solid var(--about-border);
  transition: border-color 0.2s var(--about-ease), transform 0.2s var(--about-ease);
}
.page-about__brand-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}
.page-about__brand-card-title {
  display: inline-block;
  color: var(--color-accent);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.page-about__brand-card p {
  margin: 0;
  color: var(--color-text);
  font-size: 0.92rem;
  line-height: 1.65;
}

/* ---------- 02 编辑部工作流 ---------- */
.page-about__workflow {
  margin-top: 24px;
  display: grid;
  gap: 24px;
}
.page-about__workflow-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}
.page-about__workflow-steps li {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 18px;
  padding: 20px 0;
  border-bottom: 1px solid var(--about-border);
}
.page-about__workflow-steps li:first-child {
  padding-top: 0;
}
.page-about__workflow-steps li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.page-about__workflow-index {
  font-family: var(--font-data);
  color: var(--color-accent);
  font-size: 1.3rem;
  line-height: 1;
}
.page-about__workflow-steps h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.03em;
}
.page-about__workflow-steps p {
  margin: 0;
  color: var(--color-text-dim);
  font-size: 0.88rem;
  line-height: 1.6;
}
.page-about__workflow-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--about-radius-lg);
  border: 1px solid var(--about-border);
  object-fit: cover;
  aspect-ratio: 16 / 9;
}
@media (min-width: 720px) {
  .page-about__workflow {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
}

/* ---------- 03 数据范围与口径 ---------- */
.page-about__scope-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 24px;
}
@media (min-width: 640px) {
  .page-about__scope-layout {
    grid-template-columns: repeat(3, 1fr);
  }
}
.page-about__scope-card {
  background: var(--about-bg-card);
  border-radius: var(--about-radius-md);
  padding: 18px;
  border: 1px solid var(--about-border);
  display: grid;
  gap: 8px;
  align-content: start;
}
.page-about__scope-value {
  font-size: 1.8rem;
  color: var(--color-accent);
  line-height: 1;
}
.page-about__scope-note {
  margin: 0;
  color: var(--color-text-dim);
  font-size: 0.85rem;
  line-height: 1.6;
}
.page-about__scope-panel {
  margin-top: 18px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  align-items: start;
  background: var(--color-accent-soft);
  border: 1px solid rgba(57, 255, 20, 0.25);
  border-radius: var(--about-radius-md);
  padding: 18px;
}
.page-about__scope-panel p {
  margin: 0;
  color: var(--color-text);
  font-size: 0.92rem;
  line-height: 1.65;
}
.page-about__scope-pill {
  justify-self: start;
}
@media (min-width: 640px) {
  .page-about__scope-panel {
    grid-template-columns: auto 1fr;
    align-items: center;
  }
}

/* ---------- 04 版本演进 ---------- */
.page-about__timeline {
  position: relative;
  margin-top: 28px;
  display: grid;
  gap: 22px;
  padding-left: 20px;
  border-left: 2px solid var(--about-border);
}
.page-about__timeline-track {
  display: none;
}
.page-about__timeline-item {
  position: relative;
}
.page-about__timeline-item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--about-border);
  border: 2px solid var(--color-bg);
}
.page-about__timeline-item--current::before {
  background: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(57, 255, 20, 0.2);
}
.page-about__timeline-era {
  display: inline-block;
  color: var(--color-accent);
  font-family: var(--font-data);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}
.page-about__timeline-item h3 {
  margin: 0 0 8px;
  font-size: 1.06rem;
  font-weight: 600;
}
.page-about__timeline-item p {
  margin: 0;
  color: var(--color-text-dim);
  font-size: 0.88rem;
  line-height: 1.6;
}
.page-about__timeline-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--about-radius-lg);
  border: 1px solid var(--about-border);
  object-fit: cover;
  aspect-ratio: 5 / 2;
  margin-top: 10px;
}
@media (min-width: 720px) {
  .page-about__timeline {
    grid-template-columns: 1fr 1fr;
    gap: 0 36px;
    padding-left: 26px;
  }
  .page-about__timeline-item {
    padding-bottom: 32px;
  }
}

/* ---------- 05 质量与合作 ---------- */
.page-about__quality-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 24px;
}
@media (min-width: 640px) {
  .page-about__quality-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}
.page-about__quality-card {
  background: var(--about-bg-deep);
  border-radius: var(--about-radius-md);
  padding: 16px;
  border: 1px solid var(--about-border);
  display: grid;
  gap: 10px;
  align-content: start;
}
.page-about__quality-card p {
  margin: 0;
  color: var(--color-text);
  font-size: 0.88rem;
  line-height: 1.6;
}
.page-about__quality-pill {
  justify-self: start;
}
.page-about__quality-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--about-radius-lg);
  border: 1px solid var(--about-border);
  object-fit: cover;
  aspect-ratio: 14 / 9;
  margin-top: 20px;
}
.page-about__team-panel {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
@media (min-width: 768px) {
  .page-about__team-panel {
    grid-template-columns: repeat(4, 1fr);
  }
}
.page-about__team-stat {
  background: var(--about-bg-card);
  border-radius: var(--about-radius-md);
  padding: 16px;
  border: 1px solid var(--about-border);
  display: grid;
  gap: 6px;
  align-content: start;
}
.page-about__team-num {
  font-size: 1.7rem;
  color: var(--color-text);
  line-height: 1;
}
.page-about__team-stat .text-dim {
  font-size: 0.8rem;
  line-height: 1.5;
}
.page-about__coop-panel {
  margin-top: 24px;
  border-left: 2px solid var(--color-accent);
  padding: 4px 0 4px 18px;
}
.page-about__coop-title {
  margin: 0 0 8px;
  font-size: 1.05rem;
  font-weight: 600;
}
.page-about__coop-panel p {
  margin: 0;
  color: var(--color-text-dim);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ---------- 页内关联 ---------- */
.page-about__related {
  margin-top: 48px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  padding: 24px;
  background: var(--color-accent-soft);
  border: 1px solid rgba(57, 255, 20, 0.2);
  border-radius: var(--radius-lg);
}
@media (min-width: 720px) {
  .page-about__related {
    grid-template-columns: repeat(3, 1fr);
  }
}
.page-about__related-item {
  padding: 8px 4px;
}
.page-about__related-link {
  display: inline-block;
  margin: 10px 0 6px;
  color: var(--color-accent);
  font-size: 1.1rem;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s var(--about-ease);
}
.page-about__related-link:hover {
  border-color: var(--color-accent);
}
.page-about__related-item .text-dim {
  font-size: 0.85rem;
  line-height: 1.6;
}

/* ---------- 移动端微调 ---------- */
@media (max-width: 640px) {
  .page-about__hero {
    margin-top: 20px;
  }
  .page-about__hero-title {
    font-size: 1.65rem;
  }
  .page-about__hero-side {
    margin-top: 8px;
  }
  .page-about__hero-img {
    aspect-ratio: 16 / 10;
  }
  .page-about__timeline {
    padding-left: 18px;
  }
  .page-about__timeline-item::before {
    left: -24px;
  }
  .page-about__workflow-steps li {
    grid-template-columns: 40px 1fr;
    gap: 12px;
  }
  .page-about__workflow-index {
    font-size: 1.1rem;
  }
}

/* ---------- 降低动态偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
    scroll-behavior: auto !important;
  }
}