.page-about {
  --about-space: var(--c-space);
  --about-steel: var(--c-steel);
  --about-neon: var(--c-neon);
  --about-orange: var(--c-orange);
  --about-white: var(--c-white);
  --about-cloud: var(--c-cloud);
  --about-border: var(--c-border);
  --about-gold: var(--c-gold);

  background-color: var(--about-space);
  color: var(--about-white);
  overflow-x: hidden;
  font-family: var(--font-body);
}

/* ===== 通用局部工具 ===== */
.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 14px;
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--about-neon);
}

.page-about .about-kicker::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--about-neon);
  display: inline-block;
}

.page-about .about-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 28px;
  font-size: 13px;
  color: var(--about-cloud);
}

.page-about .about-breadcrumb a {
  color: var(--about-cloud);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.page-about .about-breadcrumb a:hover {
  color: var(--about-neon);
}

/* ===== 品牌故事 ===== */
.page-about .about-story {
  position: relative;
  padding: 40px 0 64px;
}

.page-about .about-story::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 42%;
  height: 58%;
  background: linear-gradient(135deg, transparent 42%, rgba(0, 255, 136, 0.12) 42.2%, rgba(0, 255, 136, 0.12) 56%, transparent 56.2%);
  pointer-events: none;
}

.page-about .about-story-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  align-items: center;
}

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

.page-about .about-story-copy h1 {
  margin: 0 0 18px;
  font-family: var(--font-heading);
  font-size: 38px;
  line-height: 1.16;
  color: var(--about-white);
}

.page-about .about-story-lead {
  margin: 0 0 26px;
  font-size: 18px;
  line-height: 1.7;
  color: var(--about-cloud);
}

.page-about .about-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0 0 26px;
}

.page-about .about-fact {
  flex: 1 1 120px;
  border-left: 3px solid var(--about-orange);
  background: var(--about-steel);
  padding: 16px 18px;
}

.page-about .about-fact-num {
  display: block;
  font-family: var(--font-heading);
  font-size: 32px;
  font-weight: 800;
  line-height: 1;
  color: var(--about-white);
}

.page-about .about-fact-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  color: var(--about-cloud);
}

.page-about .about-story-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-story-figure {
  margin: 0;
}

.page-about .about-story-frame {
  position: relative;
  border: 2px solid var(--about-border);
  background: var(--about-steel);
}

.page-about .about-story-frame::after {
  content: "";
  position: absolute;
  right: -10px;
  bottom: -10px;
  width: 60px;
  height: 60px;
  border-right: 4px solid var(--about-neon);
  border-bottom: 4px solid var(--about-neon);
  pointer-events: none;
}

.page-about .about-story-frame img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-story-figure figcaption {
  margin-top: 14px;
  padding-left: 14px;
  border-left: 3px solid var(--about-orange);
  font-size: 14px;
  line-height: 1.6;
  color: var(--about-cloud);
}

/* ===== 发展里程碑与品牌宣言 ===== */
.page-about .about-milestones {
  padding: 64px 0;
  background-color: rgba(22, 39, 62, 0.35);
  border-top: 1px solid var(--about-border);
  border-bottom: 1px solid var(--about-border);
}

.page-about .about-milestones-head {
  max-width: 680px;
  margin-bottom: 40px;
}

.page-about .about-milestones-head h2 {
  margin: 0 0 12px;
  font-family: var(--font-heading);
  font-size: 34px;
  line-height: 1.22;
  color: var(--about-white);
}

.page-about .about-milestones-head p:last-child {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--about-cloud);
}

.page-about .about-milestones-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 48px;
}

.page-about .about-manifesto {
  position: relative;
  padding: 28px;
  border: 2px solid var(--about-neon);
  background: linear-gradient(160deg, var(--about-steel) 0%, var(--about-space) 100%);
}

.page-about .about-manifesto-mark {
  display: inline-block;
  margin-bottom: 18px;
  padding: 4px 10px;
  border: 1px solid var(--about-neon);
  font-family: var(--font-heading);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--about-neon);
}

.page-about .about-manifesto h3 {
  margin: 0 0 14px;
  font-family: var(--font-heading);
  font-size: 24px;
  line-height: 1.35;
  color: var(--about-white);
}

.page-about .about-manifesto > p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.7;
  color: var(--about-cloud);
}

.page-about .about-manifesto-list {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-manifesto-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--about-white);
}

.page-about .about-manifesto-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  background: var(--about-neon);
  transform: rotate(45deg);
}

.page-about .about-manifesto-link {
  display: inline-block;
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
  font-size: 15px;
  font-weight: 700;
  color: var(--about-neon);
  text-decoration: none;
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.page-about .about-manifesto-link:hover {
  border-color: var(--about-neon);
  transform: translateX(4px);
}

.page-about .about-timeline-wrap {
  min-width: 0;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(to bottom, var(--about-neon), var(--about-orange), transparent);
}

.page-about .about-timeline-item {
  position: relative;
  padding-left: 40px;
  margin-bottom: 20px;
}

.page-about .about-timeline-dot {
  position: absolute;
  left: 0;
  top: 12px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--about-neon);
  border: 4px solid var(--about-space);
  box-shadow: 0 0 0 2px var(--about-neon), 0 0 18px rgba(0, 255, 136, 0.35);
  transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
}

.page-about .about-timeline-item:hover .about-timeline-dot {
  background: var(--about-orange);
  transform: scale(1.3);
  box-shadow: 0 0 0 2px var(--about-orange), 0 0 28px rgba(255, 107, 53, 0.5);
}

.page-about .about-timeline-card {
  position: relative;
  padding: 20px;
  border: 1px solid var(--about-border);
  background: var(--about-steel);
  transition: border-color var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
}

.page-about .about-timeline-item:hover .about-timeline-card {
  border-color: var(--about-neon);
  transform: translateX(4px);
  box-shadow: var(--shadow-hover);
}

.page-about .about-timeline-year {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 10px;
  border: 1px solid rgba(255, 107, 53, 0.3);
  background: rgba(255, 107, 53, 0.1);
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--about-orange);
}

.page-about .about-timeline-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 20px;
  line-height: 1.4;
  color: var(--about-white);
}

.page-about .about-timeline-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--about-cloud);
}

/* ===== 技术架构 ===== */
.page-about .about-tech {
  padding: 64px 0;
}

.page-about .about-tech-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  align-items: center;
}

.page-about .about-tech-body h2 {
  margin: 0 0 16px;
  font-family: var(--font-heading);
  font-size: 34px;
  line-height: 1.22;
  color: var(--about-white);
}

.page-about .about-tech-intro {
  margin: 0 0 28px;
  font-size: 17px;
  line-height: 1.7;
  color: var(--about-cloud);
}

.page-about .about-tech-cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-bottom: 28px;
}

.page-about .about-tech-card {
  padding: 18px;
  border: 2px solid var(--about-border);
  border-left: 4px solid var(--about-orange);
  background: var(--about-steel);
  transition: border-color var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
}

.page-about .about-tech-card:hover {
  border-color: var(--about-neon);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.page-about .about-tech-card h3 {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.4;
  color: var(--about-white);
}

.page-about .about-tech-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--about-cloud);
}

.page-about .about-tech-figure {
  margin: 0;
}

.page-about .about-tech-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 2px solid var(--about-border);
  background: var(--about-steel);
}

.page-about .about-tech-figure figcaption {
  margin-top: 12px;
  padding-left: 14px;
  border-left: 3px solid var(--about-neon);
  font-size: 14px;
  line-height: 1.6;
  color: var(--about-cloud);
}

/* ===== 服务承诺 ===== */
.page-about .about-promise {
  padding: 64px 0;
  border-top: 1px solid var(--about-border);
  background-color: rgba(22, 39, 62, 0.35);
}

.page-about .about-promise-head {
  max-width: 680px;
  margin-bottom: 32px;
}

.page-about .about-promise-head h2 {
  margin: 0 0 12px;
  font-family: var(--font-heading);
  font-size: 34px;
  line-height: 1.22;
  color: var(--about-white);
}

.page-about .about-promise-head p:last-child {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--about-cloud);
}

.page-about .about-promise-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-promise-card {
  padding: 22px;
  border: 2px solid var(--about-border);
  background: var(--about-steel);
  transition: border-color var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
}

.page-about .about-promise-card:hover {
  border-color: var(--about-gold);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.page-about .about-promise-num {
  display: inline-block;
  margin-bottom: 12px;
  padding: 3px 8px;
  border: 1px solid var(--about-neon);
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 800;
  color: var(--about-neon);
}

.page-about .about-promise-card h3 {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.4;
  color: var(--about-white);
}

.page-about .about-promise-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--about-cloud);
}

.page-about .about-promise-figure {
  margin: 24px 0 0;
}

.page-about .about-promise-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 2px solid var(--about-border);
  background: var(--about-steel);
}

.page-about .about-promise-figure figcaption {
  margin-top: 12px;
  padding-left: 14px;
  border-left: 3px solid var(--about-neon);
  font-size: 14px;
  line-height: 1.6;
  color: var(--about-cloud);
}

.page-about .about-promise-support {
  margin-top: 24px;
  padding: 20px;
  border: 1px dashed var(--about-border);
  background: rgba(10, 26, 47, 0.6);
}

.page-about .about-promise-support h3 {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.4;
  color: var(--about-white);
}

.page-about .about-promise-support p {
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--about-cloud);
}

.page-about .about-promise-support a {
  color: var(--about-neon);
  text-decoration: underline;
}

/* ===== 响应式 ===== */
@media (min-width: 640px) {
  .page-about .about-facts {
    gap: 16px;
  }

  .page-about .about-tech-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-promise-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-promise-figure {
    grid-column: 1 / -1;
  }

  .page-about .about-promise-support {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1024px) {
  .page-about .about-story {
    padding: 56px 0 80px;
  }

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

  .page-about .about-story-copy h1 {
    font-size: 48px;
  }

  .page-about .about-milestones-grid {
    grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.28fr);
    gap: 56px;
  }

  .page-about .about-manifesto {
    position: sticky;
    top: 24px;
    align-self: start;
  }

  .page-about .about-tech-grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 56px;
  }

  .page-about .about-tech-body {
    order: 2;
  }

  .page-about .about-tech-figure {
    order: 1;
  }

  .page-about .about-promise-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}