.page-about {
  background: var(--moon-gray);
  overflow-x: hidden;
}

/* ===== 01 品牌概述 Hero ===== */
.page-about-hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(130deg, var(--dark-purple) 0%, var(--deep-green) 55%, var(--pitch-green-deep) 100%);
  color: var(--white);
  padding-top: calc(var(--header-h) + 40px);
  padding-bottom: 72px;
}

.page-about-hero::before {
  content: "";
  position: absolute;
  right: -160px;
  top: -60px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 179, 0, .22), transparent 68%);
  pointer-events: none;
}

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

.page-about-hero .breadcrumb {
  color: rgba(255, 255, 255, .72);
  font-family: var(--accent-font);
  font-size: .85rem;
  margin-bottom: 36px;
}

.page-about-hero .breadcrumb a {
  color: rgba(255, 255, 255, .9);
  text-decoration: none;
}

.page-about-hero .breadcrumb a:hover {
  color: var(--track-orange);
}

.page-about-hero .breadcrumb-current {
  color: rgba(255, 255, 255, .72);
}

.page-about-hero .tag {
  color: var(--track-orange);
}

.page-about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: end;
}

.page-about-hero-copy {
  max-width: 560px;
}

.page-about-hero-title {
  font-family: var(--heading-font);
  font-weight: 900;
  font-style: italic;
  font-size: clamp(2.5rem, 10vw, 4.5rem);
  line-height: 1.05;
  letter-spacing: -.02em;
  text-transform: uppercase;
  margin: 20px 0 0;
}

.page-about-hero .lead {
  color: rgba(255, 255, 255, .82);
  font-size: 1.05rem;
  margin-top: 24px;
  max-width: 520px;
}

.page-about-hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  margin-top: 40px;
  padding-top: 28px;
  border-top: 1px solid rgba(255, 255, 255, .16);
}

.page-about-hero-stats .stat-num {
  display: block;
  font-family: var(--accent-font);
  font-weight: 700;
  font-size: 2rem;
  color: var(--track-orange);
  line-height: 1;
}

.page-about-hero-stats .stat-label {
  display: block;
  font-size: .85rem;
  color: rgba(255, 255, 255, .7);
  margin-top: 8px;
}

.page-about-phone {
  margin: 0 auto;
  max-width: 300px;
}

.page-about-phone img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 28px;
  box-shadow: var(--shadow-strong);
  transform: rotate(2deg);
  transition: var(--transition);
}

.page-about-phone img:hover {
  transform: rotate(0deg) translateY(-6px);
}

.page-about-phone figcaption,
.page-about-chart figcaption,
.page-about-region-img figcaption {
  font-family: var(--accent-font);
  font-size: .78rem;
  color: rgba(255, 255, 255, .65);
  margin-top: 12px;
  text-align: center;
  letter-spacing: .04em;
}

/* ===== 章节通用 ===== */
.page-about-milestones,
.page-about-capability,
.page-about-trust {
  padding: 72px 0;
}

.page-about-section-title {
  font-family: var(--heading-font);
  font-size: clamp(1.4rem, 3.4vw, 2.2rem);
  font-weight: 900;
  line-height: 1.2;
  color: var(--deep-green);
  margin-top: 16px;
  max-width: 680px;
}

/* ===== 02 发展里程碑 ===== */
.page-about-milestones {
  background: var(--white);
}

.page-about-timeline {
  margin-top: 48px;
  display: grid;
  gap: 0;
}

.page-about-timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  padding: 24px 0 32px 20px;
}

.page-about-timeline-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--track-orange) 0%, var(--hot-orange) 45%, var(--night-purple) 100%);
}

.page-about-timeline-item::after {
  content: "";
  position: absolute;
  left: -6px;
  top: 30px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--white);
  border: 4px solid var(--hot-orange);
  box-shadow: 0 0 0 4px rgba(255, 87, 34, .12);
}

.page-about-timeline-item:first-child::before {
  top: 34px;
}

.page-about-year {
  font-family: var(--accent-font);
  font-weight: 700;
  font-style: italic;
  font-size: clamp(2.6rem, 9vw, 4.2rem);
  line-height: .95;
  color: rgba(255, 87, 34, .16);
  -webkit-text-stroke: 1px var(--hot-orange);
  user-select: none;
}

.page-about-timeline-body h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--pitch-green);
  margin: 0 0 8px;
}

.page-about-timeline-body p {
  color: rgba(26, 26, 46, .78);
  max-width: 640px;
  margin: 0;
  line-height: 1.7;
}

.page-about-tag {
  display: inline-block;
  margin-top: 12px;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(46, 125, 50, .08);
  color: var(--pitch-green);
  font-family: var(--accent-font);
  font-size: .75rem;
  letter-spacing: .06em;
}

/* ===== 03 数据与能力 ===== */
.page-about-capability {
  background: linear-gradient(160deg, var(--moon-gray) 0%, rgba(94, 53, 177, .08) 55%, var(--moon-gray) 100%);
}

.page-about-capability-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
  margin-top: 40px;
}

.page-about-capability-text h2 {
  font-family: var(--heading-font);
  font-size: clamp(1.4rem, 3.4vw, 2.2rem);
  line-height: 1.2;
  color: var(--dark-purple);
  margin: 0 0 16px;
}

.page-about-capability-text > p {
  color: rgba(26, 26, 46, .76);
  line-height: 1.7;
  max-width: 620px;
}

.page-about-metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin: 32px 0 20px;
}

.page-about-metrics .metric {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-soft);
  border-left: 4px solid var(--pitch-green);
}

.page-about-metrics .metric:nth-child(2) {
  border-left-color: var(--night-purple);
}

.page-about-metrics .metric:nth-child(3) {
  border-left-color: var(--hot-orange);
}

.page-about-metrics .metric:nth-child(4) {
  border-left-color: var(--track-orange);
}

.page-about-metrics .metric-num {
  display: block;
  font-family: var(--accent-font);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--dark-purple);
  line-height: 1.1;
}

.page-about-metrics .metric-label {
  display: block;
  font-size: .82rem;
  color: rgba(26, 26, 46, .6);
  margin-top: 6px;
}

.page-about-note {
  font-family: var(--accent-font);
  font-size: .85rem;
  color: var(--night-purple-deep);
  background: rgba(94, 53, 177, .06);
  border-left: 3px solid var(--night-purple);
  padding: 12px 16px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

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

.page-about-chart img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-strong);
}

.page-about-chart figcaption {
  color: rgba(26, 26, 46, .54);
}

/* ===== 04 运营与区域 ===== */
.page-about-region {
  background: linear-gradient(130deg, var(--dark-purple) 0%, #14143A 55%, var(--night-purple-deep) 100%);
  color: var(--white);
  padding: 72px 0;
}

.page-about-region .chapter-title {
  color: var(--white);
}

.page-about-region .chapter-num {
  color: var(--track-orange);
}

.page-about-region-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
  margin-top: 40px;
}

.page-about-region-text h2 {
  font-family: var(--heading-font);
  font-size: clamp(1.4rem, 3.4vw, 2.2rem);
  line-height: 1.2;
  color: var(--white);
  margin: 0 0 16px;
}

.page-about-region-text p {
  color: rgba(255, 255, 255, .78);
  line-height: 1.7;
  max-width: 560px;
}

.page-about-region-list {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
  display: grid;
  gap: 12px;
}

.page-about-region-list li {
  position: relative;
  padding-left: 22px;
  font-size: .95rem;
  color: rgba(255, 255, 255, .85);
}

.page-about-region-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .55em;
  width: 10px;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--hot-orange), var(--track-orange));
}

.page-about-region-img {
  margin: 0;
}

.page-about-region-img img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-strong);
}

.page-about-region-img figcaption {
  color: rgba(255, 255, 255, .55);
}

/* ===== 05 资质与合作 ===== */
.page-about-trust {
  background: var(--moon-gray);
}

.page-about-trust-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 40px;
}

.page-about-trust-card {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  box-shadow: var(--shadow-soft);
  border-top: 4px solid var(--pitch-green);
  transition: var(--transition);
}

.page-about-trust-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-strong);
}

.page-about-trust-card:nth-child(2) {
  border-top-color: var(--night-purple);
}

.page-about-trust-card:nth-child(3) {
  border-top-color: var(--track-orange);
}

.page-about-trust-card:nth-child(4) {
  border-top-color: var(--hot-orange);
}

.page-about-trust-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--deep-green);
  margin: 0 0 10px;
}

.page-about-trust-card p {
  font-size: .92rem;
  line-height: 1.65;
  color: rgba(26, 26, 46, .72);
  margin: 0;
}

.page-about-trust-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 40px;
}

/* ===== 桌面端增强 ===== */
@media (min-width: 768px) {
  .page-about-hero {
    padding-top: calc(var(--header-h) + 56px);
    padding-bottom: 96px;
  }

  .page-about-hero-grid {
    grid-template-columns: 1.15fr .85fr;
    gap: 64px;
  }

  .page-about-phone {
    margin: 0 0 0 auto;
    max-width: 330px;
  }

  .page-about-timeline-item {
    grid-template-columns: 200px 1fr;
    gap: 32px;
    padding: 36px 0 44px 32px;
  }

  .page-about-capability-grid {
    grid-template-columns: 1.05fr .95fr;
    gap: 56px;
  }

  .page-about-region-grid {
    grid-template-columns: .85fr 1.15fr;
    gap: 56px;
  }

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

@media (min-width: 1080px) {
  .page-about-trust-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation: none !important;
    transition: none !important;
  }

  .page-about-phone img {
    transform: none;
  }

  .page-about-trust-card:hover {
    transform: none;
  }
}