/* ============ 品牌档案页 ============ */
.page-about {
  --about-gold-soft: rgba(201, 162, 39, 0.14);
  --about-gold-line: rgba(201, 162, 39, 0.32);
  --about-ink-ink: #1A1915;
  --about-paper-soft: rgba(245, 241, 232, 0.82);
  --about-paper-dim: rgba(245, 241, 232, 0.07);
  background: var(--surface-page);
  color: var(--text-body);
}

/* ---- 面包屑 ---- */
.page-about .breadcrumb {
  padding: 128px 0 20px;
}

.page-about .breadcrumb__list {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
}

.page-about .breadcrumb__item {
  display: flex;
  align-items: center;
  color: var(--text-muted);
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "→";
  margin: 0 10px;
  color: var(--accent-gold);
  font-size: var(--text-xs);
}

.page-about .breadcrumb__link {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .breadcrumb__link:hover {
  color: var(--accent-gold);
}

/* ---- 首屏 ---- */
.page-about .about-hero {
  padding: 44px 0 64px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 48px;
}

.page-about .about-hero__kicker {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.3em;
  color: var(--accent-gold);
  text-transform: uppercase;
  margin: 0 0 32px 0;
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-about .about-hero__kicker::before {
  content: "";
  width: 48px;
  height: 1px;
  background: var(--accent-gold);
  flex: none;
}

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

.page-about .about-hero__title {
  margin: 0 0 28px 0;
  font-size: clamp(2rem, 5vw, var(--text-4xl));
  line-height: 1.18;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--text-strong);
  max-width: 10em;
}

.page-about .about-hero__lead {
  margin: 0;
  font-size: var(--text-base);
  line-height: 1.85;
  color: var(--text-body);
  max-width: 42em;
}

.page-about .about-hero__aside {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .about-hero__meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin: 0;
}

.page-about .about-hero__meta-item {
  background: var(--surface-page);
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-hero__meta-item dt {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
  letter-spacing: 0.08em;
}

.page-about .about-hero__meta-item dd {
  margin: 0;
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--accent-gold);
}

.page-about .about-hero__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---- 主体布局 ---- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  padding-bottom: 80px;
}

/* ---- 侧栏 ---- */
.page-about .about-sidebar {
  position: relative;
}

.page-about .about-sidebar__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-sidebar__link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  color: var(--text-muted);
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease;
}

.page-about .about-sidebar__link:hover,
.page-about .about-sidebar__link:focus-visible {
  background: var(--hover-bg);
  color: var(--text-strong);
}

.page-about .about-sidebar__num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--accent-gold);
}

/* ---- 内容区块通用 ---- */
.page-about .about-section {
  scroll-margin-top: 96px;
  padding-top: 56px;
  margin-bottom: 64px;
}

.page-about .about-section:first-of-type {
  padding-top: 0;
}

.page-about .about-section .section-label {
  margin-bottom: 20px;
}

.page-about .about-section__title {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--text-strong);
  line-height: 1.3;
  margin: 0 0 16px 0;
}

.page-about .about-section__lead {
  font-size: var(--text-base);
  line-height: 1.8;
  color: var(--text-body);
  margin: 0 0 32px 0;
  max-width: 44em;
}

/* ---- 品牌理念 ---- */
.page-about .about-philosophy {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-philosophy__text p {
  margin: 0 0 16px 0;
  line-height: 1.8;
}

.page-about .about-philosophy__points {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-philosophy__points li {
  position: relative;
  padding: 14px 0 14px 24px;
  border-bottom: 1px solid var(--line);
  font-size: var(--text-sm);
  color: var(--ink-2);
}

.page-about .about-philosophy__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--accent-gold);
}

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

.page-about .about-philosophy__figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  object-fit: cover;
  transition: box-shadow 0.3s ease;
}

.page-about .about-philosophy__figure:hover img {
  box-shadow: var(--shadow-md);
}

/* ---- 发展历程：时间轴 ---- */
.page-about .about-timeline {
  position: relative;
  margin-top: 40px;
  padding-left: 30px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 4px;
  bottom: 4px;
  width: 1px;
  background: var(--line);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 52px;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__dot {
  position: absolute;
  left: -30px;
  top: 4px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--paper);
  border: 2.5px solid var(--accent-gold);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-timeline__item:hover .about-timeline__dot {
  transform: scale(1.3);
  box-shadow: 0 0 0 6px var(--about-gold-soft);
}

.page-about .about-timeline__phase {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--accent-gold);
  margin-bottom: 8px;
}

.page-about .about-timeline__card h3 {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--text-strong);
  margin: 0 0 10px;
}

.page-about .about-timeline__card p {
  margin: 0;
  line-height: 1.75;
  color: var(--text-body);
  max-width: 46em;
}

.page-about .about-timeline__card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  align-items: center;
}

.page-about .about-timeline__card-grid img {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  object-fit: cover;
}

/* ---- 服务能力 ---- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin: 40px 0 32px;
}

.page-about .about-stats .stat-card {
  background: var(--surface-card);
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
  transition: box-shadow 0.2s ease;
}

.page-about .about-stats .stat-card:hover {
  box-shadow: inset 0 0 0 2px var(--accent-gold);
  z-index: 1;
}

.page-about .about-stats .stat-card__index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--accent-gold);
}

.page-about .about-stats .stat-card__value {
  font-size: var(--text-xl);
  font-weight: 900;
  color: var(--text-strong);
  line-height: 1.2;
}

.page-about .about-stats .stat-card__label {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: 1.5;
}

.page-about .about-capability__figure {
  margin: 0 0 32px;
}

.page-about .about-capability__figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  object-fit: cover;
  box-shadow: var(--shadow-sm);
}

.page-about .about-capability__note {
  margin: 0;
  padding: 20px 24px;
  border-left: 3px solid var(--accent-gold);
  background: var(--surface-card);
  font-size: var(--text-base);
  line-height: 1.8;
  color: var(--ink-2);
}

/* ---- 团队与资质 ---- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-team__intro p {
  margin: 0 0 24px;
  line-height: 1.8;
}

.page-about .about-team__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-team__credential {
  background: var(--surface-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 28px;
}

.page-about .about-team__credential h3 {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--text-strong);
  margin: 0 0 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .about-team__credential h3::before {
  content: "§";
  color: var(--accent-gold);
  font-family: var(--font-mono);
}

.page-about .about-team__credential p {
  margin: 0 0 12px;
  line-height: 1.8;
  font-size: var(--text-sm);
}

.page-about .about-team__credential a {
  color: var(--accent-gold-strong);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--about-gold-line);
}

.page-about .about-team__credential a:hover {
  color: var(--text-strong);
  text-decoration-color: var(--text-strong);
}

/* ---- 收尾导航 ---- */
.page-about .about-next {
  border-top: 1px solid var(--line);
  padding-top: 48px;
  margin-top: 16px;
}

.page-about .about-next__inner {
  background: var(--about-ink-ink);
  color: var(--paper);
  border-radius: var(--radius-md);
  padding: 40px 28px;
  position: relative;
  overflow: hidden;
}

.page-about .about-next__inner::after {
  content: "DATA";
  position: absolute;
  right: 20px;
  top: 18px;
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: 900;
  color: var(--about-paper-dim);
  letter-spacing: 0.08em;
  line-height: 1;
  pointer-events: none;
}

.page-about .about-next__kicker {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.24em;
  color: var(--accent-gold);
  margin-bottom: 12px;
}

.page-about .about-next h2 {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--paper);
  margin: 0 0 20px;
}

.page-about .about-next p {
  font-size: var(--text-sm);
  line-height: 1.9;
  color: var(--about-paper-soft);
  margin: 0 0 28px;
  max-width: 40em;
}

.page-about .about-next a {
  color: var(--accent-gold);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-next a:hover {
  color: var(--paper);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  position: relative;
  z-index: 1;
}

.page-about .about-next__actions .btn {
  text-decoration: none;
}

.page-about .about-next__actions .btn--ghost {
  color: var(--paper);
  border-color: rgba(245, 241, 232, 0.5);
}

/* ---- 目标区块高亮 ---- */
.page-about .about-section:target {
  animation: about-target-pulse 2s ease;
}

@keyframes about-target-pulse {
  0% {
    background: var(--about-gold-soft);
  }
  100% {
    background: transparent;
  }
}

/* ---- 平板 640px ---- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-timeline__card-grid {
    grid-template-columns: 1fr 200px;
  }

  .page-about .about-team {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
  }

  .page-about .about-hero__title {
    font-size: var(--text-3xl);
  }

  .page-about .about-next__inner {
    padding: 48px 40px;
  }
}

/* ---- 桌面 1024px ---- */
@media (min-width: 1024px) {
  .page-about .about-hero {
    padding: 56px 0 88px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 1.3fr 0.7fr;
    gap: 80px;
  }

  .page-about .about-hero__lead {
    font-size: var(--text-lg);
  }

  .page-about .about-layout {
    grid-template-columns: 220px 1fr;
    gap: 64px;
    align-items: start;
  }

  .page-about .about-sidebar {
    position: sticky;
    top: 110px;
  }

  .page-about .about-sidebar__nav {
    display: block;
    border: none;
    padding: 0;
  }

  .page-about .about-sidebar__link {
    display: flex;
    width: 100%;
    padding: 10px 12px;
    border-left: 2px solid transparent;
    margin-bottom: 4px;
    border-radius: 0;
  }

  .page-about .about-sidebar__link:hover {
    border-left-color: var(--accent-gold);
    background: transparent;
  }

  .page-about .about-section {
    scroll-margin-top: 120px;
    padding-top: 72px;
    margin-bottom: 96px;
  }

  .page-about .about-section__title {
    font-size: var(--text-3xl);
  }

  .page-about .about-philosophy {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 56px;
  }

  .page-about .about-next__inner {
    padding: 56px 64px;
  }
}