.page-about {
  --about-hero-bg: linear-gradient(135deg, #ecf4f8 0%, #faf6ef 55%, #f7eddc 100%);
  --about-mission-bg: linear-gradient(135deg, var(--deep-sky) 0%, var(--sky-blue) 100%);
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 首屏左右分屏 ---------- */
.page-about .about-hero {
  padding: 64px 0 48px;
  background: var(--about-hero-bg);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: center;
}

.page-about .about-hero__content {
  max-width: 640px;
}

.page-about .about-hero__content h1 {
  margin: 16px 0;
  font-family: var(--font-title);
  font-size: clamp(34px, 7vw, 52px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-heading);
}

.page-about .about-hero__lead {
  margin-top: 20px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--rock-gray);
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 36px;
}

.page-about .about-stat {
  flex: 1 1 100%;
  padding: 18px 22px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(58, 124, 165, 0.16);
  border-radius: var(--radius);
  box-shadow: 0 6px 18px rgba(31, 58, 95, 0.06);
  transition: transform var(--transition), box-shadow var(--transition);
}

.page-about .about-stat:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(31, 58, 95, 0.12);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-title);
  font-size: 40px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--sky-blue);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--rock-gray);
}

.page-about .about-hero__visual {
  position: relative;
}

.page-about .about-hero__img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 20px;
  box-shadow: 0 24px 48px rgba(31, 58, 95, 0.16);
  object-fit: cover;
}

/* ---------- 章节通用编号 ---------- */
.page-about .about-index {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-title);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--sun-gold);
}

/* ---------- 运营主体 · 宽窄交替 ---------- */
.page-about .about-operator {
  padding: 72px 0;
}

.page-about .about-operator__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-operator__aside {
  padding-left: 20px;
  border-left: 4px solid var(--sky-blue);
}

.page-about .about-operator__aside h2,
.page-about .about-journey__aside h2,
.page-about .about-region__inner h2 {
  margin: 0 0 12px;
  font-family: var(--font-title);
  font-size: 30px;
  line-height: 1.2;
  color: var(--color-heading);
}

.page-about .about-operator__aside-text {
  margin: 0;
  font-size: 14px;
  color: var(--rock-gray);
}

.page-about .about-operator__main p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.9;
}

.page-about .about-operator__main .btn {
  margin-top: 12px;
}

/* ---------- 品牌使命 · 深色强调块 ---------- */
.page-about .about-mission {
  padding: 48px 0;
}

.page-about .about-mission__inner {
  max-width: 980px;
  margin: 0 auto;
}

.page-about .about-mission__panel {
  padding: 48px clamp(24px, 6vw, 64px);
  border-radius: 28px;
  background: var(--about-mission-bg);
  color: #fff;
  box-shadow: 0 24px 48px rgba(31, 58, 95, 0.2);
}

.page-about .about-mission__panel h2,
.page-about .about-mission__panel p {
  color: #fff;
}

.page-about .about-mission__panel p {
  font-size: 15px;
  line-height: 1.9;
  max-width: 640px;
}

.page-about .about-mission__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  list-style: none;
  margin: 28px 0;
  padding: 0;
}

.page-about .about-mission__list li {
  padding: 18px 20px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 16px;
  font-size: 14px;
  line-height: 1.7;
}

.page-about .about-mission__list strong {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-title);
  font-size: 17px;
}

.page-about .about-mission__panel .btn-primary {
  background: var(--sun-gold);
  border: none;
  color: var(--deep-sky);
}

.page-about .about-mission__panel .btn-primary:hover {
  background: #f8b84e;
}

/* ---------- 发展历程 · 左侧固定叙事 + 右侧垂直时间线 ---------- */
.page-about .about-journey {
  padding: 72px 0 64px;
}

.page-about .about-journey__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 44px;
}

.page-about .about-journey__aside {
  max-width: 320px;
}

.page-about .about-journey__aside p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--rock-gray);
}

.page-about .about-journey__note {
  margin-top: 18px;
  padding: 14px 18px;
  background: var(--rice-white);
  border-left: 4px solid var(--moss-green);
  border-radius: 0 12px 12px 0;
  font-family: var(--font-title);
  font-size: 13px;
  color: var(--deep-sky);
}

.page-about .about-journey__timeline {
  position: relative;
}

.page-about .timeline-item {
  position: relative;
  padding-left: 32px;
  margin-bottom: 30px;
  transition: transform var(--transition);
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 8px;
  bottom: -28px;
  width: 2px;
  background: #dce6dd;
}

.page-about .timeline-item:last-child::before {
  display: none;
}

.page-about .timeline-item__dot {
  position: absolute;
  left: 4px;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--terracotta);
  border: 3px solid var(--color-bg);
}

.page-about .timeline-item__dot--current {
  background: var(--sun-gold);
  box-shadow: 0 0 0 5px rgba(245, 166, 35, 0.2);
}

.page-about .timeline-item__marker {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 14px;
  border-radius: 999px;
  background: var(--rice-white);
  border: 1px solid #e5e0d3;
  font-family: var(--font-title);
  font-size: 13px;
  font-weight: 600;
  color: var(--deep-sky);
}

.page-about .timeline-item__body {
  border-left: 4px solid var(--sky-blue);
  background: #fff;
  padding: 20px 22px;
  border-radius: 0 16px 16px 0;
  box-shadow: 0 6px 18px rgba(31, 58, 95, 0.07);
  transition: transform var(--transition), box-shadow var(--transition);
}

.page-about .timeline-item:hover .timeline-item__body {
  transform: translateX(6px);
  box-shadow: 0 14px 32px rgba(31, 58, 95, 0.14);
}

.page-about .timeline-item__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-title);
  font-size: 18px;
  line-height: 1.3;
  color: var(--color-heading);
}

.page-about .timeline-item__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--rock-gray);
}

.page-about .about-journey__visual {
  margin-top: 52px;
}

.page-about .about-journey__visual img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 20px;
  box-shadow: 0 20px 44px rgba(31, 58, 95, 0.14);
  object-fit: cover;
}

/* ---------- 地域连接 · 全宽背景层 ---------- */
.page-about .about-region {
  position: relative;
  padding: 96px 0;
  overflow: hidden;
}

.page-about .about-region__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-region__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.4;
}

.page-about .about-region::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(90deg, rgba(31, 58, 95, 0.42) 0%, rgba(58, 124, 165, 0.24) 100%);
}

.page-about .about-region__content {
  position: relative;
  z-index: 2;
}

.page-about .about-region__inner {
  max-width: 620px;
  padding: clamp(28px, 5vw, 48px);
  background: rgba(250, 246, 239, 0.92);
  backdrop-filter: blur(8px);
  border-radius: 24px;
  box-shadow: 0 16px 40px rgba(31, 58, 95, 0.2);
}

.page-about .about-region__inner p {
  font-size: 15px;
  line-height: 1.9;
  color: var(--rock-gray);
}

.page-about .about-region__inner .btn {
  margin-top: 8px;
}

/* ---------- 平板 & 桌面：移动优先增强 ---------- */
@media (min-width: 600px) {
  .page-about .about-hero__stats {
    flex-wrap: nowrap;
  }

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

@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 88px 0 56px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: 56px;
  }

  .page-about .about-operator {
    padding: 84px 0;
  }

  .page-about .about-operator__grid {
    grid-template-columns: minmax(0, 320px) minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .about-mission {
    padding: 56px 0;
  }

  .page-about .about-mission__panel {
    padding: 64px clamp(32px, 7vw, 80px);
  }

  .page-about .about-journey {
    padding: 84px 0 72px;
  }

  .page-about .about-journey__layout {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
    gap: 64px;
  }

  .page-about .about-journey__aside {
    position: sticky;
    top: 100px;
    align-self: start;
  }

  .page-about .timeline-item {
    display: grid;
    grid-template-columns: 16px 116px minmax(0, 1fr);
    column-gap: 22px;
    align-items: start;
    padding-left: 0;
  }

  .page-about .timeline-item::before {
    left: 7px;
  }

  .page-about .timeline-item__dot {
    left: 0;
    top: 8px;
  }

  .page-about .timeline-item__marker {
    margin: 4px 0 0;
  }

  .page-about .about-region {
    padding: 120px 0;
  }
}