.page-about {
  --about-ink-soft: #3D4740;
  --about-shadow: 0 18px 40px rgba(10, 13, 12, .18);
}

.page-about .section {
  padding: clamp(54px, 9vw, 104px) 0;
}

.page-about .about-head {
  max-width: 760px;
  margin-bottom: clamp(30px, 5vw, 50px);
}

.page-about .about-head--tight {
  margin-bottom: clamp(24px, 4vw, 36px);
}

/* ---------- 首屏 ---------- */
.page-about .mast {
  position: relative;
  padding: clamp(24px, 5vw, 46px) 0 clamp(40px, 7vw, 76px);
  overflow: hidden;
  background:
    radial-gradient(120% 78% at 88% 4%, rgba(184, 255, 61, .17), transparent 58%),
    radial-gradient(90% 72% at 2% 98%, rgba(47, 168, 255, .15), transparent 62%),
    var(--ink);
}

.page-about .mast::after {
  content: "";
  position: absolute;
  right: -10%;
  bottom: -60px;
  width: 78%;
  height: 130px;
  background: repeating-linear-gradient(115deg, rgba(184, 255, 61, .14) 0 2px, transparent 2px 16px);
  transform: skewY(-4deg);
  pointer-events: none;
}

.page-about .breadcrumb {
  margin-bottom: clamp(26px, 5vw, 44px);
}

.page-about .mast-grid {
  display: grid;
  gap: clamp(30px, 6vw, 52px);
  align-items: end;
}

.page-about .mast-copy .lede {
  max-width: 44ch;
  margin-top: 20px;
  color: var(--fog);
}

.page-about .mast-copy .btn-row {
  margin-top: 28px;
}

.page-about .mast-visual {
  position: relative;
  min-height: 210px;
}

.page-about .mast-art {
  display: block;
  width: 100%;
  height: auto;
  opacity: .95;
}

.page-about .mast-art-trail {
  stroke-dasharray: 520;
  stroke-dashoffset: 0;
  animation: about-trail 4.4s var(--ease) forwards;
}

.page-about .mast-art-dots circle {
  animation: about-pulse 2.6s var(--ease) infinite;
}

.page-about .mast-art-dots circle:nth-child(2n) {
  animation-delay: .9s;
}

.page-about .mast-art-dots circle:nth-child(3n) {
  animation-delay: 1.6s;
}

@keyframes about-trail {
  from { stroke-dashoffset: 520; }
  to { stroke-dashoffset: 0; }
}

@keyframes about-pulse {
  0%, 100% { opacity: .45; }
  50% { opacity: 1; }
}

.page-about .mast-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px 12px;
  margin: clamp(34px, 6vw, 54px) 0 0;
  padding: 20px 0 0;
  border-top: 1px dashed var(--line-dash);
  list-style: none;
}

.page-about .mast-stat {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px;
}

.page-about .mast-stat-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 5vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-about .mast-stat-unit {
  font-size: 13px;
  color: var(--fog);
}

.page-about .mast-stat-key {
  flex-basis: 100%;
  margin-top: 6px;
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: .02em;
  color: var(--fog);
}

.page-about .mast-index {
  display: flex;
  gap: 8px;
  margin-top: clamp(28px, 5vw, 42px);
  padding-bottom: 4px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .mast-index::-webkit-scrollbar {
  display: none;
}

.page-about .mast-index a {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 15px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--fog);
  text-decoration: none;
  border: 1px solid var(--line);
  clip-path: polygon(9px 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%, 0 9px);
  transition: color .22s var(--ease), border-color .22s var(--ease), background-color .22s var(--ease);
}

.page-about .mast-index a:hover,
.page-about .mast-index a:focus-visible {
  color: var(--paper);
  border-color: var(--line-strong);
  background: rgba(184, 255, 61, .08);
}

.page-about .mi-num {
  font-family: var(--font-mono);
  color: var(--lime);
}

/* ---------- 起点 ---------- */
.page-about .start {
  position: relative;
}

.page-about .start::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-dash) 22%, transparent 82%);
}

.page-about .start-grid {
  display: grid;
  gap: clamp(30px, 5vw, 52px);
  align-items: start;
}

.page-about .start-media {
  margin: 0;
}

.page-about .start-media img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .start-copy .prose p + p {
  margin-top: 1.2em;
}

/* ---------- 三条主线 ---------- */
.page-about .lines {
  position: relative;
  overflow: hidden;
}

.page-about .lines::before {
  content: "";
  position: absolute;
  top: -80px;
  left: -12%;
  width: 60%;
  height: 160px;
  background: linear-gradient(100deg, rgba(184, 255, 61, .16), transparent 70%);
  transform: skewY(-5deg);
  pointer-events: none;
}

.page-about .lines-grid {
  align-items: start;
}

.page-about .lines-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(22px, 3.4vw, 30px);
}

.page-about .lines-code {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--lime);
}

.page-about .lines-text {
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--fog);
}

.page-about .lines-link {
  margin-top: auto;
  padding-top: 14px;
  font-size: 14px;
  font-weight: 700;
  color: var(--lime);
  text-decoration: none;
  border-top: 1px dashed var(--line);
  transition: color .22s var(--ease);
}

.page-about .lines-link::after {
  content: " →";
  font-family: var(--font-mono);
}

.page-about .lines-link:hover,
.page-about .lines-link:focus-visible {
  color: var(--orange);
}

.page-about .lines-tail {
  max-width: 62ch;
  margin-top: clamp(30px, 5vw, 46px);
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--fog);
  border-left: 3px solid var(--lime);
}

/* ---------- 时间轴 ---------- */
.page-about .tl {
  position: relative;
  padding-left: 34px;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(180deg, var(--lime), rgba(184, 255, 61, .08));
}

.page-about .tl-item {
  position: relative;
  border-bottom: 1px dashed var(--line);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 26px;
  width: 14px;
  height: 14px;
  background: var(--ink);
  border: 2px solid var(--lime);
  transform: rotate(45deg) translateX(-3px);
}

.page-about .tl-heading {
  margin: 0;
}

.page-about .tl-trigger {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "year icon"
    "title title"
    "sum sum";
  gap: 8px 12px;
  width: 100%;
  padding: 22px 0;
  text-align: left;
  background: none;
  border: 0;
  cursor: pointer;
  color: inherit;
}

.page-about .tl-num {
  grid-area: year;
  font-family: var(--font-mono);
  font-size: clamp(20px, 4.2vw, 28px);
  font-weight: 700;
  color: var(--lime);
  letter-spacing: .04em;
}

.page-about .tl-title {
  grid-area: title;
  font-size: clamp(17px, 2.6vw, 21px);
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .tl-sum {
  grid-area: sum;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--fog);
}

.page-about .tl-icon {
  grid-area: icon;
  align-self: center;
  width: 12px;
  height: 12px;
  border-right: 2px solid var(--orange);
  border-bottom: 2px solid var(--orange);
  transform: rotate(45deg);
  transition: transform .22s var(--ease);
}

.page-about .tl-trigger[aria-expanded="true"] .tl-icon {
  transform: rotate(-135deg);
}

.page-about .tl-trigger:hover .tl-title,
.page-about .tl-trigger:focus-visible .tl-title {
  color: var(--lime);
}

.page-about .tl .acc-body {
  padding-bottom: 20px;
}

.page-about .tl .acc-inner p {
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--fog);
}

.page-about .tl-item:last-child {
  border-bottom: 0;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(30px, 5vw, 52px);
}

.page-about .team-media {
  margin: 0;
}

.page-about .team-media img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .section--paper .h2,
.page-about .section--paper .h3 {
  color: var(--ink);
}

.page-about .section--paper .prose {
  color: var(--about-ink-soft);
}

.page-about .section--paper .eyebrow {
  color: var(--lime-dark);
}

.page-about .team-prose {
  margin-top: clamp(22px, 4vw, 32px);
}

.page-about .team-prose p + p {
  margin-top: 1.1em;
}

.page-about .team-legend {
  margin-top: clamp(26px, 4vw, 38px);
}

.page-about .team-bar {
  display: flex;
  gap: 4px;
  height: 16px;
  margin-bottom: 22px;
}

.page-about .team-seg {
  display: block;
  height: 100%;
  clip-path: polygon(6px 0, 100% 0, 100% 100%, 0 100%, 0 6px);
}

.page-about .team-seg--a {
  flex: 22 1 0;
  background: var(--lime-dark);
}

.page-about .team-seg--b {
  flex: 19 1 0;
  background: var(--blue);
}

.page-about .team-seg--c {
  flex: 6 1 0;
  background: var(--orange);
}

.page-about .team-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .team-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-areas:
    "dot name count"
    "dot note note";
  gap: 4px 10px;
  padding: 12px 14px;
  background: rgba(10, 13, 12, .04);
  border-left: 3px solid transparent;
  transition: background-color .22s var(--ease), border-color .22s var(--ease), transform .22s var(--ease);
}

.page-about .team-item:hover {
  background: rgba(184, 255, 61, .16);
  border-left-color: var(--lime-dark);
  transform: translateX(3px);
}

.page-about .team-dot {
  grid-area: dot;
  align-self: center;
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.page-about .team-dot--a { background: var(--lime-dark); }
.page-about .team-dot--b { background: var(--blue); }
.page-about .team-dot--c { background: var(--orange); }

.page-about .team-name {
  grid-area: name;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .team-count {
  grid-area: count;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--lime-dark);
  white-space: nowrap;
}

.page-about .team-note {
  grid-area: note;
  font-size: 13px;
  line-height: 1.6;
  color: var(--about-ink-soft);
}

/* ---------- 我们的做法 ---------- */
.page-about .principles {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(80% 60% at 92% 12%, rgba(255, 107, 44, .14), transparent 60%),
    var(--ink);
}

.page-about .principles-list {
  display: grid;
  gap: clamp(26px, 4vw, 40px);
}

.page-about .principle {
  position: relative;
  padding-left: 22px;
  border-left: 2px solid var(--line);
  transition: border-color .22s var(--ease);
}

.page-about .principle:hover {
  border-left-color: var(--lime);
}

.page-about .principle-quote {
  font-size: clamp(22px, 4.6vw, 34px);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.24;
  color: var(--paper);
}

.page-about .principle-text {
  max-width: 46ch;
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--fog);
}

/* ---------- 合作生态 ---------- */
.page-about .partners-media {
  margin: 0 0 clamp(30px, 5vw, 46px);
}

.page-about .partners-media img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .partners-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(22px, 3.4vw, 30px);
}

.page-about .partners-num {
  font-family: var(--font-mono);
  font-size: clamp(38px, 8vw, 56px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-about .partners-unit {
  margin-left: 6px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  color: var(--fog);
}

.page-about .partners-card p {
  font-size: 15px;
  line-height: 1.74;
  color: var(--fog);
}

/* ---------- 结尾行动区 ---------- */
.page-about .cta-grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  align-items: center;
}

.page-about .cta-copy p {
  max-width: 52ch;
  margin-top: 14px;
  font-size: 15.5px;
  line-height: 1.76;
  color: var(--wine-text);
}

.page-about .cta-actions {
  flex-wrap: wrap;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .team-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .team-item {
    grid-template-columns: auto 1fr;
    grid-template-areas:
      "dot name"
      "count count"
      "note note";
  }
}

@media (min-width: 900px) {
  .page-about .mast-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }

  .page-about .mast-visual {
    min-height: 300px;
  }

  .page-about .start-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
  }

  .page-about .start-media {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .lines-card:nth-child(2) {
    margin-top: 18px;
  }

  .page-about .lines-card:nth-child(3) {
    margin-top: 36px;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
    align-items: start;
  }

  .page-about .team-media {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .principles-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(20px, 3vw, 34px);
  }

  .page-about .cta-grid {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .mast-art-trail,
  .page-about .mast-art-dots circle {
    animation: none;
  }

  .page-about .team-item,
  .page-about .mast-index a,
  .page-about .tl-icon {
    transition: none;
  }
}
</main>