.page-about {
  --about-pad-y: 72px;
  background: var(--white);
  overflow-x: hidden;
}

/* ========== 平台叙事 / Hero ========== */
.page-about__story {
  position: relative;
  overflow: hidden;
  padding: 48px 20px 72px;
  color: var(--white);
  background:
    radial-gradient(1100px 480px at 85% 15%, rgba(0, 255, 178, 0.16) 0%, transparent 60%),
    linear-gradient(135deg, var(--deep-sea) 0%, var(--deep-sea-light) 100%);
}
.page-about__story::before {
  content: '';
  position: absolute;
  top: 0;
  right: -16%;
  width: 65%;
  height: 100%;
  background: rgba(255, 138, 0, 0.07);
  transform: skewX(-12deg);
  pointer-events: none;
}
.page-about__story-inner {
  position: relative;
  z-index: 1;
  max-width: var(--container);
  margin-inline: auto;
}
.page-about__breadcrumb a,
.page-about__breadcrumb li {
  color: rgba(255, 255, 255, 0.72);
}
.page-about__breadcrumb a:hover {
  color: var(--neon-green);
}
.page-about__breadcrumb li[aria-current="page"] {
  color: var(--neon-green);
}
.page-about__story-grid {
  display: grid;
  gap: 40px;
  align-items: center;
  margin-top: 40px;
}
.page-about__kicker {
  display: inline-block;
  padding: 6px 16px;
  border: 1px solid rgba(0, 255, 178, 0.35);
  border-radius: var(--radius-pill);
  color: var(--neon-green);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.page-about__story-copy h1 {
  margin: 20px 0 16px;
  font-family: var(--font-heading);
  font-size: clamp(30px, 5.2vw, 52px);
  font-weight: 900;
  line-height: 1.12;
  transform: skewX(-2deg);
}
.page-about__story-copy .lead {
  color: var(--foam);
  margin-bottom: 12px;
}
.page-about__hero-note {
  margin-top: 20px;
  padding: 14px 18px;
  border-left: 3px solid var(--warm-orange);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: rgba(255, 255, 255, 0.06);
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.85);
}
.page-about__hero-note strong {
  color: var(--neon-green);
}
.page-about__story-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}
.page-about__btn-ghost {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.45);
  color: var(--white);
}
.page-about__btn-ghost:hover {
  border-color: var(--neon-green);
  background: rgba(0, 255, 178, 0.08);
  color: var(--neon-green);
}
.page-about__story-media {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-float);
}
.page-about__story-img {
  display: block;
  width: 100%;
  height: auto;
}

/* ========== 覆盖规模区 ========== */
.page-about__scale {
  padding: var(--about-pad-y) 20px;
  background: var(--foam);
}
.page-about__scale .container {
  max-width: var(--container);
}
.page-about__scale-head {
  margin-bottom: 40px;
}
.page-about__scale-head h2 {
  margin: 12px 0 8px;
  font-family: var(--font-heading);
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 900;
  transform: skewX(-2deg);
  color: var(--deep-sea);
}
.page-about__scale-head .section-sub {
  color: var(--cold-gray);
}
.page-about__stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 48px;
}
.page-about__stat-card {
  position: relative;
  padding: 24px 20px;
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}
.page-about__stat-card::after {
  content: '';
  position: absolute;
  top: 16px;
  right: 16px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--neon-green);
  box-shadow: 0 0 0 4px rgba(0, 255, 178, 0.18);
}
.page-about__stat-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--cold-gray);
}
.page-about__stat-num {
  display: inline-block;
  margin: 10px 0 4px;
  padding-bottom: 2px;
  font-family: var(--font-number);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  color: var(--deep-sea);
  border-bottom: 4px solid var(--neon-green);
}
.page-about__stat-num small {
  font-family: var(--font-heading);
  font-size: 0.5em;
  font-weight: 900;
}
.page-about__stat-desc {
  font-size: 14px;
  color: var(--ink);
}
.page-about__scale-grid {
  display: grid;
  gap: 32px;
  align-items: center;
}
.page-about__scale-copy p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
}
.page-about__scale-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about__scale-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink);
}
.page-about__scale-list li::before {
  content: '';
  position: absolute;
  top: 9px;
  left: 0;
  width: 8px;
  height: 8px;
  border: 2px solid var(--deep-sea);
  border-radius: 50%;
  background: var(--neon-green);
}
.page-about__scale-copy .data-number {
  padding: 2px 8px;
  border-radius: 6px;
  background: var(--deep-sea);
  color: var(--neon-green);
  font-weight: 700;
}
.page-about__scale-figure {
  margin: 0;
  padding: 12px;
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}
.page-about__scale-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: calc(var(--radius-lg) - 8px);
  object-fit: cover;
}
.page-about__scale-figure figcaption {
  padding: 12px 8px 4px;
  font-size: 13px;
  text-align: center;
  color: var(--cold-gray);
}

/* ========== 发展历程区 ========== */
.page-about__journey {
  position: relative;
  padding: var(--about-pad-y) 20px;
  background: var(--white);
}
.page-about__journey > .container {
  position: relative;
  z-index: 1;
  max-width: var(--container);
}
.page-about__journey-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  margin: 0;
  overflow: hidden;
  pointer-events: none;
  opacity: 0.35;
}
.page-about__journey-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-about__journey-head {
  margin-bottom: 48px;
}
.page-about__journey-head h2 {
  margin: 12px 0 8px;
  font-family: var(--font-heading);
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 900;
  transform: skewX(-2deg);
  color: var(--deep-sea);
}
.page-about__journey-head .section-sub {
  color: var(--cold-gray);
}
.page-about__timeline {
  position: relative;
  display: grid;
  gap: 28px;
}
.page-about__timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 9px;
  width: 2px;
  background: linear-gradient(180deg, var(--neon-green), var(--deep-sea), var(--warm-orange));
  opacity: 0.5;
}
.page-about__tl-item {
  position: relative;
  padding-left: 36px;
}
.page-about__tl-dot {
  position: absolute;
  top: 24px;
  left: 0;
  width: 20px;
  height: 20px;
  border: 4px solid var(--white);
  border-radius: 50%;
  background: var(--neon-green);
  box-shadow: 0 0 0 2px var(--neon-green);
}
.page-about__tl-card {
  padding: 20px 22px;
  background: var(--foam);
  border-radius: var(--radius-lg);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.page-about__tl-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}
.page-about__tl-tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: var(--deep-sea);
  color: var(--neon-green);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.page-about__tl-card h3 {
  margin: 12px 0 8px;
  font-size: 20px;
  font-weight: 800;
  color: var(--deep-sea);
}
.page-about__tl-card > p {
  margin: 0 0 8px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}
.page-about__tl-more {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
}
.page-about__tl-more summary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background: var(--deep-sea);
  color: var(--neon-green);
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  list-style: none;
  user-select: none;
}
.page-about__tl-more summary::-webkit-details-marker {
  display: none;
}
.page-about__tl-more summary::after {
  content: '+';
  font-family: var(--font-number);
  transition: transform 0.3s var(--ease);
}
.page-about__tl-more[open] summary::after {
  transform: rotate(45deg);
}
.page-about__tl-more > p {
  margin: 12px 0 0;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.6);
}

/* ========== 内容生态区 ========== */
.page-about__ecosystem {
  padding: var(--about-pad-y) 20px;
  background:
    radial-gradient(900px 420px at 10% 10%, rgba(0, 255, 178, 0.10) 0%, transparent 60%),
    linear-gradient(180deg, var(--deep-sea) 0%, var(--deep-sea-light) 100%);
  color: var(--white);
}
.page-about__ecosystem .container {
  max-width: var(--container);
}
.page-about__eco-head {
  margin-bottom: 40px;
}
.page-about__eco-head h2 {
  margin: 12px 0 8px;
  font-family: var(--font-heading);
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 900;
  transform: skewX(-2deg);
  color: var(--white);
}
.page-about__eco-head .section-sub {
  color: rgba(255, 255, 255, 0.65);
}
.page-about__eco-grid {
  display: grid;
  gap: 20px;
}
.page-about__eco-card {
  position: relative;
  padding: 28px 24px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  background: rgba(26, 59, 79, 0.85);
  transition: background 0.3s var(--ease), transform 0.3s var(--ease);
}
.page-about__eco-card:hover {
  background: rgba(26, 59, 79, 1);
  transform: translateY(-4px);
}
.page-about__eco-num {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-number);
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
  color: var(--warm-orange);
}
.page-about__eco-card h3 {
  margin: 0 0 10px;
  font-size: 20px;
  font-weight: 800;
  color: var(--white);
}
.page-about__eco-card p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.82);
}
.page-about__eco-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  border-bottom: 1px solid transparent;
  color: var(--neon-green);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}
.page-about__eco-link:hover {
  border-color: var(--neon-green);
}
.page-about__eco-mobile {
  display: grid;
  gap: 16px;
  margin-top: 32px;
  padding: 28px;
  border: 1px solid rgba(0, 255, 178, 0.25);
  border-radius: var(--radius-lg);
  background: rgba(0, 255, 178, 0.08);
}
.page-about__eco-mobile-badge {
  display: inline-block;
  justify-self: start;
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  background: var(--warm-orange);
  color: var(--deep-sea);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.06em;
}
.page-about__eco-mobile h3 {
  margin: 14px 0 8px;
  font-size: 22px;
  font-weight: 800;
  color: var(--white);
}
.page-about__eco-mobile p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.85);
}
.page-about__eco-mobile-note {
  margin-top: 12px;
}
.page-about__eco-mobile-note a {
  color: var(--neon-green);
  text-decoration: underline;
}

/* ========== 桌面端断点 ========== */
@media (min-width: 900px) {
  .page-about__story {
    padding: 56px 40px 88px;
  }
  .page-about__story-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 64px;
    margin-top: 48px;
  }
  .page-about__stat-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
  }
  .page-about__scale-grid {
    grid-template-columns: 1fr 1fr;
    gap: 56px;
  }
  .page-about__timeline {
    grid-template-columns: repeat(5, 1fr);
    gap: 24px;
    padding-top: 28px;
  }
  .page-about__timeline::before {
    top: 14px;
    bottom: auto;
    left: 0;
    right: 0;
    width: auto;
    height: 2px;
    background: linear-gradient(90deg, var(--neon-green), var(--deep-sea), var(--warm-orange));
  }
  .page-about__tl-item {
    padding-left: 0;
    padding-top: 12px;
  }
  .page-about__tl-dot {
    top: 5px;
    left: 50%;
    transform: translateX(-50%);
  }
  .page-about__tl-card {
    height: 100%;
  }
  .page-about__eco-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
  .page-about__eco-mobile {
    grid-template-columns: auto 1fr;
    gap: 24px;
    align-items: center;
    padding: 32px 36px;
  }
  .page-about__eco-mobile h3 {
    margin-top: 0;
  }
}