.page-about {
  --about-tint: #EFE9DE;
  --about-line: rgba(13, 27, 42, 0.12);
  background: var(--rice-white);
  color: var(--ink);
  overflow-x: hidden;
}

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

.page-about__container {
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

.page-about__section {
  padding-block: var(--space-7) var(--space-8);
}

.page-about__section .section-heading {
  margin-bottom: var(--space-6);
}

.page-about__section--tint {
  background: var(--about-tint);
}

.page-about__section--dark {
  background: var(--ink-blue);
  color: var(--rice-white);
}

.page-about__section--dark .section-heading h2 {
  color: var(--rice-white);
}

.page-about__lead {
  font-size: var(--text-h3);
  font-weight: 600;
  color: var(--ink-blue);
  margin-bottom: var(--space-4);
}

/* ========== Hero ========== */
.page-about__hero {
  position: relative;
  padding: var(--space-5) 0 var(--space-7);
  background: var(--ink-blue);
  color: var(--rice-white);
  overflow: hidden;
}

.page-about__hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--bright-orange), var(--lime));
  z-index: 2;
}

.page-about__hero::after {
  content: "";
  position: absolute;
  right: -15%;
  top: 12%;
  width: 50%;
  height: 130%;
  background: linear-gradient(135deg, transparent 30%, var(--ink-blue-light) 30%);
  transform: rotate(16deg);
  opacity: 0.45;
  pointer-events: none;
}

.page-about__hero .breadcrumb {
  margin-bottom: var(--space-6);
  position: relative;
  z-index: 1;
}

.page-about__hero .breadcrumb__link,
.page-about__hero .breadcrumb__current {
  color: var(--rice-white);
}

.page-about__hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  position: relative;
  z-index: 1;
}

.page-about__hero-index {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.page-about__hero .section-index {
  color: var(--lime);
}

.page-about__hero h1 {
  font-family: var(--font-head);
  font-size: var(--text-display);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--rice-white);
  margin-bottom: var(--space-4);
}

.page-about__hero-summary {
  color: rgba(245, 240, 230, 0.82);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.8;
  max-width: 56ch;
  margin-bottom: var(--space-6);
}

.page-about__hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.page-about__hero .btn--ghost {
  color: var(--rice-white);
  border-color: rgba(245, 240, 230, 0.55);
}

.page-about__hero-figure {
  margin: 0;
  border-radius: 12px;
  overflow: hidden;
  border: 2px solid var(--ink-blue-light);
  position: relative;
}

.page-about__hero-figure::after {
  content: "";
  position: absolute;
  inset: 10px -10px -10px 10px;
  border: 2px solid var(--bright-orange);
  border-radius: 12px;
  z-index: 0;
  pointer-events: none;
}

.page-about__hero-img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  position: relative;
  z-index: 1;
}

.page-about__hero-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-7);
  padding-top: var(--space-6);
  border-top: 1px solid rgba(245, 240, 230, 0.14);
  position: relative;
  z-index: 1;
}

.page-about__stat-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.page-about__stat-item .data-stat {
  font-size: clamp(1.4rem, 3vw, 2rem);
}

.page-about__stat-item .data-label {
  color: rgba(245, 240, 230, 0.6);
}

/* ========== 品牌使命 ========== */
.page-about__mission-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.page-about__mission-text p {
  line-height: 1.8;
  margin-bottom: var(--space-4);
}

.page-about__mission-values {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.page-about__value-card {
  background: var(--rice-white);
  border: 1px solid var(--about-line);
  border-radius: 10px;
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}

.page-about__value-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.page-about__value-num {
  display: inline-flex;
  font-family: var(--font-data);
  font-size: var(--text-sm);
  color: var(--terracotta);
  border-bottom: 2px solid var(--terracotta);
  padding-bottom: var(--space-1);
  margin-bottom: var(--space-3);
}

.page-about__value-card h3 {
  font-family: var(--font-head);
  font-size: var(--text-h3);
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.page-about__value-card p {
  color: var(--rock-grey);
  font-size: var(--text-sm);
  line-height: 1.6;
}

/* ========== 发展里程碑 ========== */
.page-about__timeline {
  position: relative;
  display: grid;
  gap: var(--space-5);
  padding-left: var(--space-5);
}

.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--terracotta);
  opacity: 0.35;
}

.page-about__timeline-item {
  position: relative;
}

.page-about__timeline-rail {
  position: absolute;
  left: calc(-1 * var(--space-5));
  top: 6px;
  width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about__timeline-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--terracotta);
  box-shadow: 0 0 0 3px rgba(199, 123, 90, 0.18);
}

.page-about__timeline-card {
  position: relative;
  background: var(--rice-white);
  border: 1px solid var(--about-line);
  border-left: 4px solid var(--terracotta);
  border-radius: 10px;
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-slow), box-shadow var(--transition-slow);
}

.page-about__timeline-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.page-about__timeline-year {
  font-family: var(--font-data);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--bright-orange);
}

.page-about__timeline-card h3 {
  font-family: var(--font-head);
  font-size: var(--text-h3);
  font-weight: 800;
  margin: var(--space-2) 0;
}

.page-about__timeline-card p {
  color: var(--rock-grey);
  line-height: 1.6;
}

/* ========== 数据覆盖 ========== */
.page-about__coverage-intro {
  color: rgba(245, 240, 230, 0.8);
  line-height: 1.7;
  max-width: 64ch;
  margin-bottom: var(--space-6);
}

.page-about__coverage-figure {
  margin: 0 0 var(--space-6);
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--ink-blue-light);
}

.page-about__coverage-img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about__coverage-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

.page-about__coverage-card {
  background: var(--ink-blue-light);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: var(--space-5);
  transition: border-color var(--transition), transform var(--transition);
}

.page-about__coverage-card:hover {
  border-color: rgba(255, 109, 0, 0.45);
  transform: translateY(-2px);
}

.page-about__coverage-card .data-stat {
  display: block;
  font-size: var(--text-h1);
  line-height: 1.2;
  margin-bottom: var(--space-1);
}

.page-about__coverage-card .data-label {
  color: rgba(245, 240, 230, 0.7);
}

.page-about__coverage-card p {
  color: rgba(245, 240, 230, 0.65);
  font-size: var(--text-sm);
  line-height: 1.6;
  margin-top: var(--space-2);
}

.page-about__coverage-note {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
  margin-top: var(--space-6);
  padding-top: var(--space-5);
  border-top: 1px solid rgba(245, 240, 230, 0.12);
}

.page-about__coverage-note p {
  color: rgba(245, 240, 230, 0.75);
  line-height: 1.7;
  flex: 1;
}

/* ========== 团队介绍 ========== */
.page-about__team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  align-items: center;
}

.page-about__team-figure {
  margin: 0;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--about-line);
}

.page-about__team-img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about__team-copy > p {
  line-height: 1.8;
  margin-bottom: var(--space-5);
}

.page-about__team-roles {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.page-about__role {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: var(--space-3);
  background: var(--rice-white);
  border: 1px solid var(--about-line);
  border-radius: 10px;
  padding: var(--space-4);
  transition: box-shadow var(--transition), transform var(--transition);
}

.page-about__role:hover {
  box-shadow: var(--shadow-sm);
  transform: translateX(4px);
}

.page-about__role-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background: var(--rice-white-dark);
  color: var(--terracotta);
  font-size: 1.15rem;
  font-family: var(--font-data);
}

.page-about__role h3 {
  font-size: var(--text-base);
  font-weight: 700;
  font-family: var(--font-head);
  margin-top: 0;
}

.page-about__role p {
  font-size: var(--text-sm);
  color: var(--rock-grey);
  line-height: 1.5;
  margin-top: var(--space-1);
}

/* ========== 资质认证 ========== */
.page-about__credential-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.page-about__credential {
  background: var(--rice-white);
  border: 1px solid var(--about-line);
  border-radius: 12px;
  padding: var(--space-4);
  transition: border-color var(--transition);
}

.page-about__credential[open] {
  border-color: var(--moss);
}

.page-about__credential summary {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  cursor: pointer;
  padding-block: var(--space-1);
}

.page-about__credential summary::-webkit-details-marker {
  display: none;
}

.page-about__credential summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-data);
  font-size: 1.25rem;
  color: var(--moss);
  transition: transform var(--transition);
}

.page-about__credential[open] summary::after {
  transform: rotate(45deg);
}

.page-about__credential-badge {
  display: inline-flex;
  padding: 4px 10px;
  font-size: var(--text-xs);
  font-family: var(--font-data);
  font-weight: 700;
  background: var(--moss);
  color: var(--rice-white);
  border-radius: 6px;
  letter-spacing: 0.05em;
}

.page-about__credential-title {
  font-weight: 700;
  font-family: var(--font-head);
  font-size: var(--text-base);
  color: var(--ink-blue);
}

.page-about__credential p {
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px dashed var(--rice-white-dark);
  color: var(--rock-grey);
  line-height: 1.7;
  font-size: var(--text-sm);
}

/* ========== CTA ========== */
.page-about__cta {
  background: var(--ink-blue);
  color: var(--rice-white);
  padding: var(--space-8) 0;
  text-align: center;
}

.page-about__cta h2 {
  font-family: var(--font-head);
  font-size: var(--text-h1);
  font-weight: 800;
  margin-bottom: var(--space-3);
}

.page-about__cta p {
  color: rgba(245, 240, 230, 0.7);
  margin-bottom: var(--space-6);
}

.page-about__cta-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-4);
}

.page-about__cta .btn--ghost {
  color: var(--rice-white);
  border-color: rgba(245, 240, 230, 0.5);
}

/* ========== 桌面断点 ========== */
@media (min-width: 768px) {
  .page-about__container {
    padding-inline: var(--space-7);
  }

  .page-about__section {
    padding-block: var(--space-8) var(--space-8);
  }

  .page-about__hero {
    padding-bottom: var(--space-8);
  }

  .page-about__hero-grid {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
  }

  .page-about__hero-stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about__mission-grid {
    grid-template-columns: 1fr 1fr;
    align-items: start;
    gap: var(--space-8);
  }

  .page-about__mission-values {
    grid-template-columns: 1fr;
  }

  .page-about__coverage-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about__team-grid {
    grid-template-columns: 0.85fr 1.15fr;
    gap: var(--space-8);
  }

  .page-about__team-roles {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about__credential-grid {
    grid-template-columns: repeat(3, 1fr);
    align-items: start;
  }
}

@media (min-width: 1200px) {
  .page-about__container {
    padding-inline: var(--space-8);
  }

  .page-about__hero-grid {
    gap: var(--space-8);
  }

  .page-about__hero-figure {
    transform: translateY(8px);
  }
}