.page-about {
  --about-chip-bg: rgba(57, 255, 20, 0.08);
  --about-chip-border: rgba(57, 255, 20, 0.25);
  background: var(--color-bg);
  color: var(--color-text-primary);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 40px 0 72px;
  background: linear-gradient(145deg, var(--color-bg) 0%, var(--color-surface) 120%);
  overflow: hidden;
}

.page-about .about-hero__media {
  position: absolute;
  top: 0;
  right: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

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

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

.page-about .about-hero .breadcrumbs {
  margin-bottom: 36px;
}

.page-about .about-hero__content {
  max-width: 880px;
}

.page-about .about-hero__eyebrow {
  font-family: var(--font-number);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent-orange);
  margin-bottom: 14px;
}

.page-about .about-hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(40px, 10vw, 72px);
  line-height: 0.98;
  letter-spacing: 0.01em;
  margin-bottom: 24px;
}

.page-about .about-hero__lead {
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text-secondary);
  max-width: 640px;
  margin-bottom: 28px;
}

.page-about .about-hero__chips {
  list-style: none;
  margin: 0 0 32px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-hero__chips li {
  border: 1px solid var(--about-chip-border);
  background: var(--about-chip-bg);
  color: var(--color-text-primary);
  font-family: var(--font-number);
  font-size: 12px;
  line-height: 1.2;
  padding: 8px 12px;
  letter-spacing: 0.02em;
}

.page-about .about-hero__path {
  border-top: var(--border-thin) solid var(--color-border);
  margin-top: 8px;
}

.page-about .about-hero__path a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  border-bottom: var(--border-thin) solid var(--color-border);
  color: var(--color-text-primary);
  text-decoration: none;
  font-size: 14px;
  transition: background 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .about-hero__path a span {
  font-family: var(--font-number);
  font-weight: 700;
  color: var(--color-accent-green);
}

.page-about .about-hero__path a::after {
  content: "\2197";
  margin-left: auto;
  font-family: var(--font-number);
  color: var(--color-accent-orange);
}

.page-about .about-hero__path a:hover,
.page-about .about-hero__path a:focus-visible {
  background: rgba(57, 255, 20, 0.06);
  color: var(--color-accent-green);
  outline: none;
}

.page-about .about-hero__stripe {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 180%;
  height: 8px;
  background: repeating-linear-gradient(90deg, var(--color-accent-orange) 0 60px, var(--color-accent-green) 60px 120px);
  transform: skewX(-40deg) translateX(30%);
  transform-origin: right bottom;
  opacity: 0.8;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: 72px 0;
}

.page-about .section-header {
  margin-bottom: 44px;
}

.page-about .section-header__index {
  color: var(--color-accent-green);
  font-weight: 700;
}

/* ---------- 我们是谁 ---------- */
.page-about .about-who {
  background: var(--color-bg);
}

.page-about .about-who__layout {
  display: grid;
  gap: 36px;
}

.page-about .about-who__copy p {
  color: var(--color-text-secondary);
  font-size: 15px;
  line-height: 1.85;
  margin-bottom: 16px;
}

.page-about .about-who__copy p:last-child {
  margin-bottom: 0;
}

.page-about .about-who__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.page-about .about-who__stat {
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-border);
  box-shadow: var(--shadow-strong);
  padding: 18px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  position: relative;
}

.page-about .about-who__stat::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 12px;
  height: 12px;
  border-top: var(--border-thick) solid var(--color-accent-orange);
  border-left: var(--border-thick) solid var(--color-accent-orange);
}

.page-about .about-who__stat-num {
  font-family: var(--font-number);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--color-accent-green);
}

.page-about .about-who__stat-label {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--color-text-secondary);
}

/* ---------- 数据指标带 ---------- */
.page-about .about-metrics {
  background: var(--color-surface);
  border-top: var(--border-thin) solid var(--color-border);
  border-bottom: var(--border-thin) solid var(--color-border);
  padding: 40px 0;
}

.page-about .about-metrics .data-grid {
  gap: 16px;
}

/* ---------- 发展里程碑 ---------- */
.page-about .about-milestones {
  position: relative;
  background: var(--color-bg);
}

.page-about .about-milestones::after {
  content: "";
  position: absolute;
  right: 0;
  top: 80px;
  width: 140px;
  height: 100%;
  background: repeating-linear-gradient(-45deg, transparent 0 12px, rgba(255, 69, 0, 0.05) 12px 24px);
  pointer-events: none;
}

.page-about .about-milestones__layout {
  display: grid;
  gap: 36px;
  align-items: start;
}

.page-about .about-milestones__timeline {
  display: grid;
  gap: 22px;
}

.page-about .about-milestones__item {
  position: relative;
  padding-left: 22px;
}

.page-about .about-milestones__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  height: calc(100% + 22px);
  width: 3px;
  background: var(--color-border);
}

.page-about .about-milestones__item:last-child::before {
  height: calc(100% - 6px);
}

.page-about .about-milestones__item::after {
  content: "";
  position: absolute;
  left: -8px;
  top: 12px;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 4px solid var(--color-accent-green);
}

.page-about .about-milestones__card {
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-border);
  box-shadow: var(--shadow-strong);
  padding: 22px 20px;
}

.page-about .about-milestones__period {
  display: inline-block;
  font-family: var(--font-number);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent-orange);
  margin-bottom: 8px;
}

.page-about .about-milestones__card h3 {
  font-family: var(--font-heading);
  font-size: 22px;
  line-height: 1.25;
  margin: 0 0 10px;
}

.page-about .about-milestones__card p {
  color: var(--color-text-secondary);
  font-size: 14px;
  line-height: 1.7;
  margin: 0;
}

.page-about .about-milestones__details {
  margin-top: 14px;
  border-top: var(--border-thin) solid var(--color-border);
  padding-top: 10px;
}

.page-about .about-milestones__details summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-number);
  font-size: 13px;
  color: var(--color-accent-green);
}

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

.page-about .about-milestones__details summary::before {
  content: "+ ";
  color: var(--color-accent-orange);
  font-weight: 700;
}

.page-about .about-milestones__details[open] summary::before {
  content: "\2212 ";
}

.page-about .about-milestones__details p {
  color: var(--color-text-primary);
  font-size: 13px;
  line-height: 1.7;
  margin-top: 10px;
}

.page-about .about-milestones__media {
  margin: 0;
  border: var(--border-thin) solid var(--color-border);
  box-shadow: var(--shadow-strong);
  transform: rotate(-1.2deg);
  overflow: hidden;
  background: var(--color-surface);
}

.page-about .about-milestones__media img {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 核心能力 ---------- */
.page-about .about-capabilities {
  background: linear-gradient(180deg, var(--color-bg) 0%, rgba(13, 42, 74, 0.35) 100%);
}

.page-about .about-capability__grid {
  display: grid;
  gap: 24px;
}

.page-about .about-capability__card {
  position: relative;
  padding: 28px 24px;
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-border);
  box-shadow: var(--shadow-strong);
  overflow: hidden;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .about-capability__card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent-green), var(--color-accent-orange));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease);
}

.page-about .about-capability__card:hover,
.page-about .about-capability__card:focus-within {
  transform: translateY(-6px) rotate(-0.5deg);
  border-color: rgba(57, 255, 20, 0.45);
  box-shadow: 16px 16px 0 rgba(57, 255, 20, 0.12);
}

.page-about .about-capability__card:hover::before,
.page-about .about-capability__card:focus-within::before {
  transform: scaleX(1);
}

.page-about .about-capability__index {
  font-family: var(--font-number);
  font-size: 18px;
  font-weight: 700;
  color: var(--color-accent-orange);
}

.page-about .about-capability__card h3 {
  font-family: var(--font-heading);
  font-size: 24px;
  line-height: 1.2;
  margin: 14px 0 12px;
}

.page-about .about-capability__card p {
  color: var(--color-text-secondary);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .about-capability__detail {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  border-top: var(--border-thin) solid var(--color-border);
  margin-top: 20px;
  padding-top: 16px;
}

.page-about .about-capability__detail span {
  display: inline-block;
  border: 1px solid var(--about-chip-border);
  background: var(--about-chip-bg);
  font-family: var(--font-number);
  font-size: 12px;
  padding: 6px 10px;
  color: var(--color-accent-green);
}

.page-about .about-capability__meta {
  margin-top: 20px;
  display: flex;
}

/* ---------- 团队与生态 ---------- */
.page-about .about-team {
  background: var(--color-bg);
}

.page-about .about-team__grid {
  display: grid;
  gap: 36px;
}

.page-about .about-team__content h3 {
  font-family: var(--font-heading);
  font-size: 20px;
  line-height: 1.3;
  margin: 28px 0 10px;
  padding-bottom: 8px;
  border-bottom: var(--border-thin) solid var(--color-border);
  position: relative;
}

.page-about .about-team__content h3::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 46px;
  height: 3px;
  background: var(--color-accent-green);
}

.page-about .about-team__content p {
  color: var(--color-text-secondary);
  font-size: 15px;
  line-height: 1.75;
  margin: 0;
}

.page-about .about-team__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about .about-team__tags span {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  padding: 6px 12px;
  font-family: var(--font-number);
  font-size: 12px;
  color: var(--color-accent-green);
  letter-spacing: 0.03em;
}

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

.page-about .about-team__visual {
  margin: 0;
  border: var(--border-thin) solid var(--color-border);
  box-shadow: var(--shadow-strong);
  transform: rotate(1deg);
  overflow: hidden;
  background: var(--color-surface);
}

.page-about .about-team__visual img {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 底部号召 ---------- */
.page-about .about-cta {
  padding: 56px 0 72px;
  background:
    repeating-linear-gradient(135deg, transparent 0 18px, rgba(57, 255, 20, 0.035) 18px 36px),
    var(--color-surface);
  border-top: var(--border-thin) solid var(--color-border);
}

.page-about .about-cta .container {
  text-align: center;
}

.page-about .about-cta__title {
  font-family: var(--font-heading);
  font-size: 26px;
  line-height: 1.3;
  margin-bottom: 10px;
}

.page-about .about-cta__text {
  color: var(--color-text-secondary);
  font-size: 14px;
  margin-bottom: 24px;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

/* ---------- 桌面断点 ---------- */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 48px 0 96px;
  }

  .page-about .about-hero h1 {
    font-size: 64px;
  }

  .page-about .about-hero__lead {
    font-size: 18px;
  }

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

  .page-about .about-hero__path a {
    border-bottom: 0;
    padding: 14px 12px;
  }

  .page-about .about-hero__path a + a {
    border-left: var(--border-thin) solid var(--color-border);
  }

  .page-about .about-who__layout {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: start;
  }

  .page-about .about-milestones__layout {
    grid-template-columns: 1fr 0.9fr;
    align-items: start;
  }

  .page-about .about-milestones__card {
    padding: 24px;
  }

  .page-about .about-capability__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  .page-about .about-capability__card {
    padding: 26px 20px;
  }

  .page-about .about-team__grid {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
    gap: 48px;
  }

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

@media (min-width: 1200px) {
  .page-about .about-hero h1 {
    font-size: 76px;
  }

  .page-about .about-capability__grid {
    gap: 28px;
  }

  .page-about .about-milestones__timeline {
    gap: 28px;
  }
}