.page-about {
  --about-rail-w: 60px;
  --about-gap: 32px;
  --about-hero-gap: 28px;
  --about-node-size: 12px;
  --about-line-w: 2px;
  display: block;
  width: 100%;
  max-width: 100%;
  background: var(--color-bg, #2f2f2f);
  color: var(--color-text, #fff);
  font-family: var(--font-body, Merriweather, Georgia, serif);
  line-height: 1.8;
}

/* ===== 布局容器 ===== */
.page-about .about-layout {
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 100%;
  margin: 0 auto;
  position: relative;
}

/* ===== 左侧品牌轨道 ===== */
.page-about .about-rail {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: flex-start;
  gap: 16px;
  padding: 12px 16px;
  background: var(--color-surface, #1a1a1a);
  border-bottom: var(--border-accent, 1px solid rgba(184,134,11,0.4));
  overflow-x: auto;
  flex-shrink: 0;
  width: 100%;
  box-sizing: border-box;
}

.page-about .about-rail__brand {
  font-family: var(--font-heading, Impact, Oswald, sans-serif);
  font-size: 14px;
  line-height: 1.2;
  letter-spacing: 0.12em;
  color: var(--color-primary, #d40000);
  white-space: nowrap;
  flex-shrink: 0;
  text-transform: uppercase;
}

.page-about .about-rail__brand br {
  display: none;
}

.page-about .about-rail__timeline {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 20px;
  padding-left: 8px;
  flex-wrap: nowrap;
}

.page-about .about-rail__node {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
  cursor: default;
  transition: opacity var(--transition-speed, 0.3s);
}

.page-about .about-rail__node:hover {
  opacity: 0.8;
}

.page-about .about-rail__node-dot {
  display: block;
  width: var(--about-node-size);
  height: var(--about-node-size);
  border-radius: 50%;
  background: var(--color-accent, #b8860b);
  flex-shrink: 0;
  transition: transform var(--transition-speed, 0.3s), box-shadow var(--transition-speed, 0.3s);
}

.page-about .about-rail__node[data-node].about-rail__node--active .about-rail__node-dot,
.page-about .about-rail__node:hover .about-rail__node-dot {
  transform: scale(1.3);
  box-shadow: 0 0 12px rgba(184,134,11,0.6);
}

.page-about .about-rail__node-label {
  font-family: var(--font-heading, Impact, Oswald, sans-serif);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--color-text-secondary, #ccc);
  white-space: nowrap;
  text-transform: uppercase;
}

/* ===== 右侧内容 ===== */
.page-about .about-content {
  flex: 1;
  min-width: 0;
  padding: 20px 16px 48px;
  width: 100%;
  box-sizing: border-box;
}

/* ===== 面包屑 ===== */
.page-about .about-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-family: var(--font-body, Merriweather, Georgia, serif);
  color: var(--color-text-secondary, #ccc);
  margin-bottom: 24px;
  letter-spacing: 0.02em;
}

.page-about .about-breadcrumb a {
  color: var(--color-accent, #b8860b);
  text-decoration: none;
  transition: color var(--transition-speed, 0.3s);
}

.page-about .about-breadcrumb a:hover {
  color: var(--color-primary, #d40000);
}

.page-about .about-breadcrumb__sep {
  color: var(--color-text-secondary, #ccc);
}

/* ===== 首屏英雄 ===== */
.page-about .about-hero {
  display: flex;
  flex-direction: column;
  gap: var(--about-hero-gap);
  margin-bottom: 48px;
  position: relative;
}

.page-about .about-hero__visual {
  width: 100%;
  max-width: 100%;
  border-radius: 4px;
  overflow: hidden;
  background: var(--color-surface, #1a1a1a);
  border: var(--border-accent, 1px solid rgba(184,134,11,0.4));
  box-shadow: var(--shadow-card, 0 4px 20px rgba(0,0,0,0.5));
  position: relative;
}

.page-about .about-hero__visual::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(212,0,0,0.15) 0%, transparent 50%);
  pointer-events: none;
}

.page-about .about-hero__visual img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 700 / 500;
}

.page-about .about-hero__content {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 0;
}

.page-about .about-hero__title {
  font-family: var(--font-heading, Impact, Oswald, sans-serif);
  font-size: var(--h2-size, 48px);
  line-height: 1.1;
  color: var(--color-primary, #d40000);
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.page-about .about-hero__subtitle {
  font-family: var(--font-heading, Impact, Oswald, sans-serif);
  font-size: 20px;
  line-height: 1.3;
  color: var(--color-accent, #b8860b);
  margin: 0;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.page-about .about-hero__desc {
  font-family: var(--font-body, Merriweather, Georgia, serif);
  font-size: var(--body-size, 18px);
  line-height: 1.8;
  color: var(--color-text, #fff);
  margin: 0;
  max-width: 580px;
}

/* ===== 通用章节 ===== */
.page-about .section-title {
  font-family: var(--font-heading, Impact, Oswald, sans-serif);
  font-size: var(--h3-size, 32px);
  line-height: 1.2;
  color: var(--color-accent, #b8860b);
  margin: 0 0 8px 0;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.page-about .section-title--red {
  color: var(--color-primary, #d40000);
}

.page-about .tag {
  display: inline-block;
  font-family: var(--font-heading, Impact, Oswald, sans-serif);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 2px 10px;
  border-radius: 2px;
  line-height: 1.6;
}

.page-about .tag--gold {
  background: rgba(184,134,11,0.2);
  color: var(--color-accent, #b8860b);
  border: 1px solid rgba(184,134,11,0.4);
}

.page-about .data-highlight {
  color: var(--color-highlight, #ff4500);
  font-weight: 700;
  font-family: var(--font-heading, Impact, Oswald, sans-serif);
  letter-spacing: 0.02em;
}

.page-about .about-link {
  color: var(--color-accent, #b8860b);
  text-decoration: none;
  border-bottom: 1px solid rgba(184,134,11,0.3);
  transition: border-color var(--transition-speed, 0.3s), color var(--transition-speed, 0.3s);
}

.page-about .about-link:hover {
  color: var(--color-primary, #d40000);
  border-bottom-color: var(--color-primary, #d40000);
}

/* ===== 我们的起点 ===== */
.page-about .about-mission {
  margin-bottom: 48px;
  padding-top: 8px;
  border-top: var(--border-accent, 1px solid rgba(184,134,11,0.4));
}

.page-about .about-mission__header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.page-about .about-mission__body {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .about-mission__body p {
  font-size: var(--body-size, 18px);
  line-height: 1.8;
  color: var(--color-text, #fff);
  margin: 0;
  max-width: 640px;
}

/* ===== 数据力量 ===== */
.page-about .about-data {
  margin-bottom: 48px;
  padding-top: 8px;
  border-top: var(--border-accent, 1px solid rgba(184,134,11,0.4));
}

.page-about .about-data__header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

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

.page-about .about-data__info {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .about-data__info p {
  font-size: var(--body-size, 18px);
  line-height: 1.8;
  color: var(--color-text, #fff);
  margin: 0;
}

.page-about .about-data__visual {
  width: 100%;
  max-width: 320px;
  border-radius: 4px;
  overflow: hidden;
  background: var(--color-surface, #1a1a1a);
  border: var(--border-accent, 1px solid rgba(184,134,11,0.4));
  box-shadow: var(--shadow-card, 0 4px 20px rgba(0,0,0,0.5));
  align-self: flex-start;
}

.page-about .about-data__visual img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 300 / 200;
}

/* ===== 服务承诺 ===== */
.page-about .about-service {
  margin-bottom: 0;
  padding-top: 8px;
  border-top: var(--border-accent, 1px solid rgba(184,134,11,0.4));
}

.page-about .about-service__header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

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

.page-about .about-service__icon {
  width: 80px;
  height: 80px;
  flex-shrink: 0;
  border-radius: 50%;
  overflow: hidden;
  background: var(--color-surface, #1a1a1a);
  border: var(--border-accent, 1px solid rgba(184,134,11,0.4));
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about .about-service__icon img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 100 / 100;
}

.page-about .about-service__text {
  display: flex;
  flex-direction: column;
  gap: 16px;
  flex: 1;
}

.page-about .about-service__text p {
  font-size: var(--body-size, 18px);
  line-height: 1.8;
  color: var(--color-text, #fff);
  margin: 0;
}

.page-about .about-service__contacts {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 16px;
  background: var(--color-surface, #1a1a1a);
  border-radius: 4px;
  border-left: 3px solid var(--color-accent, #b8860b);
}

.page-about .about-service__contact-item {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-text, #fff);
}

.page-about .about-service__contact-label {
  font-family: var(--font-heading, Impact, Oswald, sans-serif);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent, #b8860b);
  min-width: 48px;
  flex-shrink: 0;
}

.page-about .about-service__footnote {
  font-size: var(--caption-size, 14px) !important;
  color: var(--color-text-secondary, #ccc) !important;
  line-height: 1.7 !important;
}

/* ===== 桌面端 ≥768px ===== */
@media (min-width: 768px) {
  .page-about .about-layout {
    flex-direction: row;
    align-items: stretch;
    max-width: 1280px;
    padding: 0 24px;
    margin: 0 auto;
  }

  /* 左侧轨道 — 垂直 */
  .page-about .about-rail {
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    gap: 32px;
    width: var(--about-rail-w);
    min-width: var(--about-rail-w);
    padding: 48px 0 32px;
    background: transparent;
    border-bottom: none;
    border-right: var(--border-accent, 1px solid rgba(184,134,11,0.4));
    overflow-x: visible;
    position: sticky;
    top: 0;
    align-self: flex-start;
    height: auto;
  }

  .page-about .about-rail__brand {
    font-size: 16px;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    letter-spacing: 0.16em;
    padding: 4px 0;
  }

  .page-about .about-rail__brand br {
    display: inline;
  }

  .page-about .about-rail__timeline {
    flex-direction: column;
    align-items: center;
    gap: 32px;
    padding: 0;
    flex: 1;
    position: relative;
  }

  .page-about .about-rail__timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: var(--about-line-w);
    background: rgba(184,134,11,0.25);
    transform: translateX(-50%);
    pointer-events: none;
  }

  .page-about .about-rail__node {
    flex-direction: column;
    gap: 8px;
    position: relative;
    z-index: 1;
  }

  .page-about .about-rail__node-dot {
    width: 14px;
    height: 14px;
  }

  .page-about .about-rail__node-label {
    font-size: 10px;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    letter-spacing: 0.1em;
  }

  /* 右侧内容 */
  .page-about .about-content {
    padding: 32px 28px 64px 40px;
    width: calc(100% - var(--about-rail-w));
  }

  /* 首屏 — 对角错位 */
  .page-about .about-hero {
    flex-direction: row;
    align-items: stretch;
    gap: 0;
    min-height: 420px;
    margin-bottom: 56px;
    position: relative;
    background: var(--color-surface, #1a1a1a);
  }

  .page-about .about-hero__visual {
    width: 58%;
    max-width: none;
    border-radius: 0;
    border: none;
    box-shadow: none;
    clip-path: polygon(0 0, 100% 0, 85% 100%, 0 100%);
    margin-right: -8%;
    flex-shrink: 0;
  }

  .page-about .about-hero__visual img {
    height: 100%;
    aspect-ratio: auto;
    object-fit: cover;
  }

  .page-about .about-hero__content {
    width: 50%;
    padding: 32px 28px 32px 24px;
    justify-content: center;
    gap: 16px;
    background: var(--color-bg, #2f2f2f);
    clip-path: polygon(10% 0, 100% 0, 100% 100%, 0 100%);
    margin-left: -6%;
    position: relative;
    z-index: 1;
  }

  .page-about .about-hero__title {
    font-size: var(--h1-size, 72px);
  }

  .page-about .about-hero__subtitle {
    font-size: 24px;
  }

  /* 数据力量 — 并排 */
  .page-about .about-data__grid {
    flex-direction: row;
    align-items: flex-start;
    gap: 32px;
  }

  .page-about .about-data__info {
    flex: 1;
  }

  .page-about .about-data__visual {
    width: 280px;
    flex-shrink: 0;
  }

  /* 服务承诺 — 并排 */
  .page-about .about-service__body {
    flex-direction: row;
    align-items: flex-start;
    gap: 28px;
  }

  .page-about .about-service__icon {
    width: 100px;
    height: 100px;
  }

  .page-about .about-service__contacts {
    max-width: 480px;
  }
}

/* ===== 大桌面 ≥1024px ===== */
@media (min-width: 1024px) {
  .page-about .about-layout {
    padding: 0 40px;
  }

  .page-about .about-content {
    padding: 40px 40px 72px 56px;
  }

  .page-about .about-hero__content {
    padding: 40px 40px 40px 32px;
  }

  .page-about .about-hero__desc {
    font-size: 20px;
  }

  .page-about .about-data__visual {
    width: 320px;
  }
}

/* ===== 超小屏保护 ===== */
@media (max-width: 359px) {
  .page-about .about-rail {
    gap: 10px;
    padding: 10px 8px;
  }

  .page-about .about-rail__timeline {
    gap: 12px;
  }

  .page-about .about-rail__node-label {
    font-size: 10px;
  }

  .page-about .about-content {
    padding: 16px 10px 32px;
  }

  .page-about .about-hero__title {
    font-size: 36px;
  }
}