.page-about {
  --about-rule: rgba(11, 18, 32, 0.14);
  --about-rule-ink: rgba(246, 241, 228, 0.18);
  --about-gap: clamp(28px, 5vw, 72px);
  background: var(--paper);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(24px, 4vw, 44px) 0 clamp(40px, 6vw, 80px);
  background:
    radial-gradient(120% 90% at 86% 4%, rgba(0, 164, 90, 0.32), transparent 58%),
    radial-gradient(90% 70% at 8% 100%, rgba(53, 224, 208, 0.14), transparent 62%),
    linear-gradient(140deg, var(--ink) 0%, var(--ink-2) 100%);
  color: var(--paper);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset-inline: -12%;
  top: 46%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--orange) 38%, var(--beacon) 68%, transparent);
  opacity: 0.55;
  transform: rotate(-5.5deg);
  z-index: 0;
  pointer-events: none;
}

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

.page-about .about-breadcrumb {
  color: rgba(246, 241, 228, 0.62);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.page-about .about-breadcrumb a {
  color: rgba(246, 241, 228, 0.88);
  text-decoration: none;
  border-bottom: 1px solid rgba(246, 241, 228, 0.28);
}

.page-about .about-breadcrumb a:hover {
  color: var(--beacon);
  border-bottom-color: var(--beacon);
}

.page-about .about-hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-top: clamp(26px, 5vw, 56px);
}

.page-about .about-hero-aside {
  display: none;
}

.page-about .about-eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange);
  margin: 0 0 16px;
}

.page-about .about-h1 {
  margin: 0;
  font-size: clamp(34px, 7.4vw, 82px);
  line-height: 1.05;
  font-weight: 900;
  letter-spacing: -0.02em;
  max-width: 18em;
}

.page-about .about-lede {
  margin: clamp(18px, 3vw, 30px) 0 0;
  max-width: 34em;
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.85;
  color: rgba(246, 241, 228, 0.82);
}

.page-about .about-hero-cta {
  margin-top: clamp(22px, 3.4vw, 36px);
}

.page-about .about-vertical {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  color: rgba(246, 241, 228, 0.5);
  display: block;
}

.page-about .about-vertical--deep {
  color: rgba(74, 90, 114, 0.72);
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(32px, 5.4vw, 64px) 0 0;
  padding: clamp(20px, 3vw, 30px) 0 0;
  border-top: 1px solid var(--about-rule-ink);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 24px;
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 4.2vw, 40px);
  line-height: 1;
  color: var(--green);
  letter-spacing: -0.02em;
}

.page-about .about-stat-num em {
  font-style: normal;
  font-size: 0.44em;
  letter-spacing: 0.06em;
  margin-left: 0.35em;
  color: rgba(246, 241, 228, 0.6);
}

.page-about .about-stat-label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(246, 241, 228, 0.66);
}

/* ---------- 01 我们在做什么 ---------- */
.page-about .about-intro {
  background: var(--paper);
}

.page-about .about-intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .about-intro-note {
  display: flex;
  align-items: flex-start;
  gap: 20px;
}

.page-about .about-intro-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(56px, 11vw, 128px);
  line-height: 0.82;
  letter-spacing: -0.05em;
  color: rgba(0, 164, 90, 0.16);
  -webkit-text-stroke: 1.5px var(--green);
  display: block;
}

.page-about .about-prose {
  margin-top: 20px;
  max-width: 40em;
}

.page-about .about-prose p {
  font-size: 17px;
  line-height: 1.9;
  color: #1d2635;
}

.page-about .about-prose p + p {
  margin-top: 18px;
}

/* ---------- 02 运营历程 ---------- */
.page-about .about-timeline {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
  padding: clamp(52px, 8vw, 110px) 0 clamp(56px, 8vw, 112px);
}

.page-about .about-timeline .wrap {
  position: relative;
  z-index: 2;
}

.page-about .about-timeline-bg {
  position: absolute;
  inset: 0;
  margin: 0;
  z-index: 0;
}

.page-about .about-timeline-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.17;
  filter: saturate(0.75) contrast(0.95);
}

.page-about .about-timeline-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--ink) 0%, rgba(11, 18, 32, 0.7) 42%, var(--ink) 100%);
}

.page-about .about-tl-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .about-tl-note,
.page-about .about-tl-note .about-vertical {
  display: none;
}

.page-about .section-title {
  margin: 0;
  font-size: clamp(24px, 3.6vw, 44px);
  line-height: 1.18;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.page-about .about-tl-lede {
  margin: 16px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(246, 241, 228, 0.72);
}

.page-about .about-tl-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}

.page-about .about-tl-nav a {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 7px 13px;
  border: 1px solid var(--about-rule-ink);
  border-radius: var(--radius);
  color: rgba(246, 241, 228, 0.8);
  text-decoration: none;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .about-tl-nav a:hover {
  color: var(--beacon);
  border-color: rgba(233, 255, 61, 0.6);
}

.page-about .about-tl-track {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin-top: clamp(30px, 5vw, 56px);
  position: relative;
}

.page-about .timeline-node {
  position: relative;
  display: block;
  padding: 20px 18px 22px;
  border: 1px solid var(--about-rule-ink);
  border-radius: var(--radius);
  background: rgba(246, 241, 228, 0.04);
  opacity: 0.62;
  scroll-margin-top: 100px;
  transition: opacity 0.45s ease, border-color 0.45s ease, background-color 0.45s ease, transform 0.3s ease;
}

.page-about .timeline-node.is-lit {
  opacity: 1;
  border-color: rgba(0, 164, 90, 0.55);
  background: rgba(0, 164, 90, 0.09);
}

.page-about .timeline-node--old {
  border-style: dashed;
}

.page-about .timeline-dot {
  display: block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--slate);
  margin-bottom: 16px;
  transition: background-color 0.4s ease, box-shadow 0.4s ease;
}

.page-about .timeline-node.is-lit .timeline-dot {
  background: var(--beacon);
  box-shadow: 0 0 0 5px rgba(233, 255, 61, 0.16);
}

.page-about .about-tl-ver {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--green);
  border: 1px solid rgba(0, 164, 90, 0.4);
  padding: 3px 8px;
  border-radius: var(--radius);
}

.page-about .about-tl-title {
  margin: 14px 0 0;
  font-size: 19px;
  line-height: 1.45;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-tl-text {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(246, 241, 228, 0.74);
}

.page-about .about-tl-meta {
  display: block;
  margin-top: 18px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(246, 241, 228, 0.5);
  padding-top: 14px;
  border-top: 1px solid var(--about-rule-ink);
}

/* ---------- 03 团队与分工 ---------- */
.page-about .about-team {
  background: var(--paper-2);
  border-top: 1px solid var(--about-rule);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-team-head {
  max-width: 46em;
}

.page-about .about-team-lede {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--slate);
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: clamp(28px, 4.6vw, 52px);
}

.page-about .about-team-card {
  position: relative;
  background: var(--card);
  border: 1px solid var(--about-rule);
  border-radius: var(--radius);
  padding: 22px 20px 24px;
  box-shadow: var(--shadow);
  outline: none;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.page-about .about-team-card:hover,
.page-about .about-team-card:focus-visible {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lift);
  border-color: rgba(0, 164, 90, 0.5);
}

.page-about .about-team-card:focus-visible {
  box-shadow: var(--shadow-lift), 0 0 0 3px rgba(233, 255, 61, 0.55);
}

.page-about .about-team-count {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(34px, 5vw, 52px);
  line-height: 1;
  color: var(--green);
  letter-spacing: -0.03em;
}

.page-about .about-team-name {
  margin: 14px 0 0;
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-about .about-team-line {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: #253044;
}

.page-about .about-team-more {
  list-style: none;
  margin: 12px 0 0;
  padding: 14px 0 0;
  border-top: 1px dashed var(--about-rule);
  display: grid;
  gap: 9px;
}

.page-about .about-team-more li {
  position: relative;
  padding-left: 15px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--slate);
}

.page-about .about-team-more li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 1px;
  background: var(--orange);
}

/* ---------- 04 流程 ---------- */
.page-about .about-flow {
  background: var(--paper);
}

.page-about .about-flow-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 60px);
  align-items: start;
}

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

.page-about .about-flow-frame {
  border: 1px solid var(--about-rule);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--card);
}

.page-about .about-flow-frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-flow-lede {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .about-flow-list {
  list-style: none;
  margin: clamp(24px, 3.6vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
  counter-reset: about-flow;
}

.page-about .about-step {
  border: 1px solid var(--about-rule);
  border-radius: var(--radius);
  background: var(--card);
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.page-about .about-step[open] {
  border-color: rgba(0, 164, 90, 0.5);
  box-shadow: var(--shadow);
}

.page-about .about-step-summary {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) 18px;
  align-items: center;
  gap: 10px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-step-idx {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .about-step-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-step-mark {
  position: relative;
  width: 14px;
  height: 14px;
  justify-self: end;
}

.page-about .about-step-mark::before,
.page-about .about-step-mark::after {
  content: "";
  position: absolute;
  background: var(--green);
  transition: transform 0.25s ease, background-color 0.25s ease;
}

.page-about .about-step-mark::before {
  left: 0;
  right: 0;
  top: 6.5px;
  height: 1.5px;
}

.page-about .about-step-mark::after {
  top: 0;
  bottom: 0;
  left: 6.5px;
  width: 1.5px;
}

.page-about .about-step[open] .about-step-mark::after {
  transform: scaleY(0);
  background: var(--beacon);
}

.page-about .about-step-body {
  padding: 0 16px 18px 68px;
}

.page-about .about-step-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.88;
  color: #253044;
}

/* ---------- 05 合作生态 ---------- */
.page-about .about-eco {
  background: var(--paper-2);
  border-top: 1px solid var(--about-rule);
}

.page-about .about-eco-head {
  max-width: 40em;
}

.page-about .about-eco-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: clamp(28px, 4.4vw, 48px);
}

.page-about .about-eco-item {
  position: relative;
  background: var(--card);
  border: 1px solid var(--about-rule);
  border-left: 3px solid var(--orange);
  border-radius: var(--radius);
  padding: 20px 20px 22px;
}

.page-about .about-eco-item--wide {
  border-left-color: var(--green);
}

.page-about .about-eco-num {
  display: block;
  font-size: clamp(30px, 4.6vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
  letter-spacing: -0.03em;
}

.page-about .about-eco-badge {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.14em;
  padding: 4px 9px;
  border-radius: var(--radius);
  background: rgba(255, 90, 31, 0.12);
  color: var(--orange);
  border: 1px solid rgba(255, 90, 31, 0.34);
}

.page-about .about-eco-badge--green {
  background: rgba(0, 164, 90, 0.12);
  color: var(--green-deep);
  border-color: rgba(0, 105, 60, 0.34);
}

.page-about .about-eco-name {
  margin: 12px 0 0;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .about-eco-item p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: #253044;
}

.page-about .about-city {
  margin: clamp(28px, 4.4vw, 46px) 0 0;
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--about-rule);
}

.page-about .about-city img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  filter: saturate(0.85);
}

.page-about .about-city .figure-cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: 30px 20px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--paper);
  background: linear-gradient(180deg, transparent, rgba(11, 18, 32, 0.86));
}

/* ---------- 06 CTA ---------- */
.page-about .about-cta {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: linear-gradient(120deg, var(--ink) 0%, var(--ink-2) 100%);
  color: var(--paper);
  padding: clamp(52px, 8vw, 104px) 0 clamp(56px, 8vw, 108px);
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  inset-inline: -10%;
  bottom: 22%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--green) 30%, var(--orange) 72%, transparent);
  opacity: 0.6;
  transform: rotate(4.5deg);
  z-index: 0;
}

.page-about .about-cta .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-cta-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 64px);
  align-items: start;
}

.page-about .about-cta-title {
  color: var(--paper);
}

.page-about .about-cta-text {
  margin: 18px 0 0;
  max-width: 32em;
  font-size: 16px;
  line-height: 1.88;
  color: rgba(246, 241, 228, 0.78);
}

.page-about .about-cta .btn-row {
  margin-top: clamp(22px, 3.4vw, 34px);
}

.page-about .about-contact {
  list-style: none;
  margin: 0;
  padding: 20px 18px;
  border: 1px solid var(--about-rule-ink);
  border-radius: var(--radius);
  background: rgba(246, 241, 228, 0.04);
  display: grid;
  gap: 16px;
}

.page-about .about-contact .contact-line {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px 12px;
  align-items: center;
}

.page-about .about-contact .contact-label {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--green);
}

.page-about .about-contact .contact-value {
  font-size: 15px;
  line-height: 1.6;
  color: rgba(246, 241, 228, 0.92);
  word-break: break-word;
}

.page-about .about-contact .copy-btn {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  padding: 5px 10px;
  border: 1px solid var(--about-rule-ink);
  border-radius: var(--radius);
  background: transparent;
  color: rgba(246, 241, 228, 0.8);
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-contact .copy-btn:hover {
  color: var(--ink);
  background: var(--beacon);
  border-color: var(--beacon);
}

.page-about .about-contact-note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: rgba(246, 241, 228, 0.6);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1fr) 64px;
    gap: 40px;
    align-items: start;
  }

  .page-about .about-hero-aside {
    display: flex;
    justify-content: flex-end;
    padding-top: 8px;
  }

  .page-about .about-intro-grid {
    grid-template-columns: minmax(0, 2fr) minmax(0, 8fr);
    gap: clamp(36px, 6vw, 92px);
  }

  .page-about .about-intro-note {
    flex-direction: column;
    gap: 26px;
    align-items: flex-start;
  }

  .page-about .about-tl-head {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 40px;
  }

  .page-about .about-tl-note {
    display: flex;
    justify-content: center;
    padding-top: 6px;
  }

  .page-about .about-tl-note .about-vertical {
    display: block;
  }

  .page-about .about-tl-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 22px;
    padding-top: 34px;
  }

  .page-about .about-tl-track::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--green) 0%, var(--orange) 52%, var(--beacon) 100%);
    opacity: 0.6;
  }

  .page-about .about-tl-node {
    margin-top: 30px;
  }

  .page-about .timeline-dot {
    position: absolute;
    top: -35px;
    left: 20px;
    margin-bottom: 0;
  }

  .page-about .about-flow-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .about-flow-media {
    position: sticky;
    top: 96px;
  }

  .page-about .about-eco-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-eco-item {
    grid-column: span 2;
  }

  .page-about .about-eco-item--wide {
    grid-column: span 3;
  }

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }
}

@media (min-width: 1024px) {
  .page-about .about-team-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .about-team-card:nth-child(1) {
    grid-column: span 2;
  }

  .page-about .about-team-card:nth-child(2) {
    grid-column: span 2;
    margin-top: 42px;
  }

  .page-about .about-team-card:nth-child(3) {
    grid-column: span 2;
    margin-top: 14px;
  }

  .page-about .about-team-card:nth-child(4) {
    grid-column: span 3;
  }

  .page-about .about-team-card:nth-child(5) {
    grid-column: span 3;
    margin-top: 34px;
  }
}

@media (min-width: 1024px) and (hover: hover) {
  .page-about .about-team-more {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    padding-top: 0;
    border-top-color: transparent;
    transition: max-height 0.38s ease, opacity 0.3s ease, margin-top 0.3s ease, padding-top 0.3s ease, border-color 0.3s ease;
  }

  .page-about .about-team-card:hover .about-team-more,
  .page-about .about-team-card:focus-within .about-team-more {
    max-height: 240px;
    opacity: 1;
    margin-top: 12px;
    padding-top: 14px;
    border-top-color: var(--about-rule);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline-node,
  .page-about .timeline-dot,
  .page-about .about-team-card,
  .page-about .about-team-more,
  .page-about .about-step-mark::before,
  .page-about .about-step-mark::after,
  .page-about .about-tl-nav a {
    transition-duration: 0.01ms;
  }

  .page-about .about-team-card:hover {
    transform: none;
  }
}