.page-about {
  --about-gold-line: rgba(212, 175, 55, 0.35);
  --about-gold-soft: rgba(212, 175, 55, 0.12);
  background: var(--green-900);
  color: var(--text);
}

.page-about .section {
  padding-block: 5rem;
  position: relative;
}

.page-about .container {
  padding-inline: clamp(1rem, 4vw, 2.5rem);
  margin-inline: auto;
  max-width: var(--container);
}

.page-about .container--narrow {
  padding-inline: clamp(1rem, 4vw, 2.5rem);
}

.page-about .breadcrumb {
  padding-block: 1.5rem 0;
  padding-inline: clamp(1rem, 4vw, 2.5rem);
  max-width: var(--container);
  margin-inline: auto;
}

.page-about h1,
.page-about h2 {
  text-wrap: balance;
}

.page-about .lead {
  max-width: 32em;
  margin-bottom: 2rem;
}

.page-about .eyebrow {
  margin-bottom: 1.25rem;
}

/* ---------- 品牌宣言 ---------- */
.page-about .page-manifesto {
  padding-top: 2rem;
  background:
    radial-gradient(ellipse at 72% 18%, rgba(31, 92, 70, 0.5), transparent 55%),
    var(--green-900);
  overflow: hidden;
}

.page-about .manifesto-grid {
  display: grid;
  gap: 3rem;
  align-items: center;
}

.page-about .manifesto-copy {
  max-width: 54rem;
}

.page-about .manifesto-copy > p:not(.eyebrow):not(.lead) {
  max-width: 46em;
  line-height: 1.85;
  margin-bottom: 1.25rem;
}

.page-about .manifesto-fig {
  margin: 0;
  position: relative;
}

.page-about .manifesto-fig::after {
  content: "";
  position: absolute;
  inset: 1rem -0.75rem -0.75rem 1rem;
  border: 1px solid var(--about-gold-line);
  border-radius: 2px;
  pointer-events: none;
}

.page-about .manifesto-img {
  position: relative;
  width: 100%;
  height: auto;
  display: block;
  border-radius: 4px;
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.25);
}

/* ---------- 关键数据 ---------- */
.page-about .page-facts {
  background: var(--green-800);
  border-block: 1px solid rgba(212, 175, 55, 0.12);
}

.page-about .facts-head {
  max-width: 44rem;
  margin-bottom: 3rem;
}

.page-about .fact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--green-700);
  border: 1px solid var(--green-700);
}

.page-about .fact-stat {
  background: var(--green-800);
  padding: 2.25rem 1.5rem;
  transition: background-color 0.3s ease;
}

.page-about .fact-stat:hover {
  background: var(--green-700);
}

.page-about .fact-stat .stat-number {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  line-height: 1.1;
  color: var(--highlight);
  margin-bottom: 0.5rem;
}

.page-about .fact-stat .stat-label {
  font-size: 0.95rem;
  color: var(--muted);
}

/* ---------- 发展历程 ---------- */
.page-about .page-timeline {
  background: linear-gradient(180deg, rgba(17, 69, 54, 0.6), rgba(11, 61, 46, 0.2)), var(--green-900);
  border-top: 1px solid rgba(212, 175, 55, 0.08);
}

.page-about .timeline-head {
  max-width: 44rem;
  margin-bottom: 3rem;
}

.page-about .timeline {
  position: relative;
  padding-left: 3.5rem;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 0.5rem;
  bottom: 0.5rem;
  left: 1.5rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--gold), var(--green-500));
  transform: translateX(-50%);
}

.page-about .t-item {
  position: relative;
  padding-bottom: 3.25rem;
}

.page-about .t-item:last-child {
  padding-bottom: 0;
}

.page-about .t-node {
  position: absolute;
  top: 0;
  left: 0.25rem;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--green-900);
  border: 2px solid var(--gold);
  box-shadow: 0 0 0 4px var(--about-gold-soft);
  font-family: var(--font-num);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--highlight);
  z-index: 1;
  cursor: default;
  transition: background-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease;
}

.page-about .t-node::after {
  content: attr(data-step);
  position: absolute;
  top: -2.1rem;
  left: 50%;
  transform: translateX(-50%);
  white-space: nowrap;
  font-family: var(--font-display);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--gold);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.page-about .t-node:hover,
.page-about .t-node:focus-visible {
  background: var(--gold);
  color: var(--ink);
  box-shadow: 0 0 0 6px rgba(255, 215, 0, 0.14);
  outline: none;
}

.page-about .t-node:hover::after,
.page-about .t-node:focus-visible::after {
  opacity: 1;
}

.page-about .t-body {
  background: var(--green-800);
  padding: 1.5rem 1.75rem;
  border-radius: 4px;
  border-left: 3px solid var(--gold);
  transition: background-color 0.3s ease, transform 0.3s ease;
}

.page-about .t-item:hover .t-body {
  background: var(--green-700);
  transform: translateY(-2px);
}

.page-about .t-cat {
  font-family: var(--font-num);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 0.6rem;
}

.page-about .t-body h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  line-height: 1.2;
  margin-bottom: 0.8rem;
  color: var(--text);
}

.page-about .t-body p {
  line-height: 1.7;
  color: var(--text);
  margin: 0;
}

/* ---------- 技术实力 ---------- */
.page-about .page-tech {
  background:
    radial-gradient(ellipse at top left, rgba(212, 175, 55, 0.07), transparent 50%),
    var(--ink);
  border-block: 1px solid rgba(212, 175, 55, 0.14);
}

.page-about .tech-grid {
  display: grid;
  gap: 3rem;
}

.page-about .tech-copy > p:not(.eyebrow) {
  max-width: 40em;
  line-height: 1.85;
  color: var(--text);
}

.page-about .tech-ul {
  list-style: none;
  padding: 0;
  margin: 2.25rem 0 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .tech-ul li {
  position: relative;
  padding-left: 2.2rem;
  line-height: 1.7;
  color: #D9E6DE;
}

.page-about .tech-ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75rem;
  width: 1.4rem;
  height: 2px;
  background: var(--gold);
}

.page-about .chart-box {
  margin-top: 2.5rem;
  border-top: 1px solid rgba(212, 175, 55, 0.18);
  padding-top: 1.5rem;
}

.page-about .growth-svg {
  width: 100%;
  height: auto;
  display: block;
}

.page-about .chart-label {
  font-family: var(--font-num);
  font-size: 12px;
  fill: var(--muted);
}

.page-about .chart-value {
  font-family: var(--font-num);
  font-size: 15px;
  font-weight: 700;
  fill: var(--highlight);
}

.page-about .chart-note {
  margin-top: 0.6rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.page-about .growth-line {
  filter: drop-shadow(0 0 6px rgba(212, 175, 55, 0.3));
}

.page-about .tech-fig {
  margin: 0;
  align-self: center;
  position: relative;
}

.page-about .tech-fig img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 6px;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.35);
}

/* ---------- 合作与生态 ---------- */
.page-about .page-eco {
  background:
    radial-gradient(ellipse at 78% 70%, rgba(31, 92, 70, 0.4), transparent 60%),
    var(--green-900);
}

.page-about .eco-layout {
  display: grid;
  gap: 3rem;
  align-items: center;
}

.page-about .eco-fig {
  margin: 0;
  position: relative;
}

.page-about .eco-fig::before {
  content: "";
  position: absolute;
  inset: -1rem 2rem 2rem -1rem;
  border: 1px solid var(--about-gold-line);
  border-radius: 6px;
  z-index: 0;
}

.page-about .eco-fig img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: auto;
  display: block;
  border-radius: 6px;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.2);
}

.page-about .eco-copy > p:not(.eyebrow) {
  max-width: 44em;
  line-height: 1.85;
  color: var(--text);
}

.page-about .eco-ul {
  list-style: none;
  margin: 2.25rem 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .eco-ul li {
  position: relative;
  padding-left: 2rem;
  line-height: 1.7;
  color: #D9E6DE;
}

.page-about .eco-ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72rem;
  width: 0.9rem;
  height: 0.9rem;
  border: 2px solid var(--gold);
  border-radius: 50%;
  box-sizing: border-box;
}

/* ---------- 继续了解 ---------- */
.page-about .page-next {
  background:
    linear-gradient(135deg, transparent 0%, rgba(212, 175, 55, 0.06) 100%),
    var(--ink);
  border-top: 1px solid rgba(212, 175, 55, 0.14);
  text-align: center;
}

.page-about .next-inner {
  max-width: 720px;
  margin-inline: auto;
}

.page-about .next-lead {
  color: var(--muted);
  max-width: 420px;
  margin: 0 auto 2.5rem;
  line-height: 1.6;
}

.page-about .next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

/* ---------- 中屏 ---------- */
@media (min-width: 640px) {
  .page-about .fact-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .fact-stat {
    padding: 2.75rem 1.75rem;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 860px) {
  .page-about .section {
    padding-block: 6.5rem;
  }

  .page-about .manifesto-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 4rem;
  }

  .page-about .timeline {
    padding-left: 0;
  }

  .page-about .timeline::before {
    left: 50%;
    top: 0;
    bottom: 0;
  }

  .page-about .t-item {
    display: grid;
    grid-template-columns: 1fr 4.5rem 1fr;
    column-gap: 2rem;
    padding-bottom: 4rem;
  }

  .page-about .t-item:last-child {
    padding-bottom: 0;
  }

  .page-about .t-node {
    position: relative;
    left: auto;
    top: auto;
    grid-column: 2;
    grid-row: 1;
    justify-self: center;
    align-self: start;
    margin-top: 1.25rem;
  }

  .page-about .t-body {
    grid-column: 1;
    grid-row: 1;
    text-align: right;
  }

  .page-about .t-item:nth-child(even) .t-body {
    grid-column: 3;
    text-align: left;
    border-left: none;
    border-right: 3px solid var(--gold);
  }

  .page-about .tech-grid {
    grid-template-columns: 1.1fr 0.62fr;
    gap: 4rem;
    align-items: center;
  }

  .page-about .eco-layout {
    grid-template-columns: 0.72fr 1fr;
    gap: 4rem;
  }
}

/* ---------- 大屏数据网格 ---------- */
@media (min-width: 1024px) {
  .page-about .fact-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .fact-stat {
    padding: 3rem 2rem;
  }
}