.page-about {
  --about-line-display: var(--ink-700);
  --about-line-audio: var(--orange-500);
  --about-line-kitchen: var(--celadon-500);
  --about-cut: 20px;
  background: var(--paper);
  color: var(--ink-900);
  overflow-x: hidden;
}

.page-about .about-crumbs {
  padding: clamp(18px, 3vw, 30px) 0 0;
}

.page-about .about-crumbs .breadcrumbs {
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--ink-500);
}

.page-about .about-crumbs .breadcrumbs a {
  color: var(--ink-500);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .18s var(--ease), color .18s var(--ease);
}

.page-about .about-crumbs .breadcrumbs a:hover {
  color: var(--orange-500);
  border-bottom-color: var(--orange-500);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: clamp(16px, 2.4vw, 28px);
  padding: clamp(40px, 6vw, 88px) 0 clamp(48px, 7vw, 96px);
  background:
    radial-gradient(120% 95% at 88% 4%, rgba(242, 115, 63, .30), transparent 56%),
    radial-gradient(95% 85% at 2% 100%, rgba(78, 156, 138, .24), transparent 62%),
    var(--ink-900);
  color: var(--paper);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(0deg, rgba(232, 237, 244, .07) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(90deg, rgba(232, 237, 244, .07) 0 1px, transparent 1px 48px);
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 56px);
  align-items: center;
}

.page-about .about-hero-copy h1 {
  margin: 10px 0 0;
  font-size: clamp(30px, 6.4vw, 52px);
  line-height: 1.12;
  letter-spacing: -.02em;
  font-weight: 800;
  max-width: 18em;
}

.page-about .about-hero .eyebrow {
  color: var(--amber);
}

.page-about .about-hero .lede {
  margin: 20px 0 0;
  max-width: 66ch;
  font-size: 17px;
  line-height: 1.75;
  color: rgba(247, 245, 241, .84);
}

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

.page-about .about-hero-facts {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  max-width: 62ch;
}

.page-about .about-hero-facts li {
  position: relative;
  padding-left: 24px;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(247, 245, 241, .8);
}

.page-about .about-hero-facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 14px;
  height: 2px;
  background: var(--orange-500);
  transform: rotate(-18deg);
}

.page-about .about-hero-media {
  margin: 0;
  border: 1px solid rgba(232, 237, 244, .16);
}

/* ---------- 通用区块间距 ---------- */
.page-about .about-split,
.page-about .about-mfg-grid {
  gap: clamp(28px, 4vw, 48px);
}

.page-about .about-origin-copy p,
.page-about .about-mfg p,
.page-about .about-network p,
.page-about .about-eco-copy p {
  font-size: 17px;
  line-height: 1.78;
  color: var(--ink-700);
  max-width: 70ch;
}

/* ---------- 客户类型面板 ---------- */
.page-about .about-clients {
  padding: clamp(24px, 3.4vw, 34px);
  background: var(--ink-100);
  border-left: 4px solid var(--orange-500);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-clients h3 {
  margin: 0 0 18px;
  font-size: 20px;
  line-height: 1.35;
  letter-spacing: -.01em;
}

.page-about .about-clients ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-clients li {
  display: grid;
  gap: 4px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(11, 26, 43, .1);
}

.page-about .about-clients li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-clients strong {
  font-size: 16px;
  letter-spacing: -.01em;
}

.page-about .about-clients span {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ink-500);
}

/* ---------- 产品三主线 ---------- */
.page-about .about-lines {
  background: linear-gradient(180deg, var(--paper), #eef2f7 62%, var(--paper));
}

.page-about .about-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 26px 0 clamp(22px, 3vw, 34px);
}

.page-about .about-lines-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-line-card {
  position: relative;
  padding: 28px 24px 30px;
  color: var(--paper);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
  overflow: hidden;
  transition: transform .22s var(--ease), box-shadow .22s var(--ease);
}

.page-about .about-line-card::before {
  content: "";
  position: absolute;
  top: 0;
  right: -30%;
  width: 70%;
  height: 100%;
  background: repeating-linear-gradient(115deg, rgba(255, 255, 255, .1) 0 2px, transparent 2px 16px);
  pointer-events: none;
}

.page-about .about-line-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-soft);
}

.page-about .about-line-card--display {
  background: linear-gradient(140deg, var(--ink-700), var(--ink-900));
}

.page-about .about-line-card--audio {
  background: linear-gradient(140deg, var(--amber), var(--orange-500));
  color: var(--ink-900);
}

.page-about .about-line-card--kitchen {
  background: linear-gradient(140deg, var(--celadon-500), var(--celadon-700));
}

.page-about .about-line-index {
  margin: 0 0 12px;
  font-size: 13px;
  letter-spacing: .18em;
  opacity: .78;
}

.page-about .about-line-card h3 {
  margin: 0 0 12px;
  font-size: 22px;
  line-height: 1.3;
  letter-spacing: -.015em;
}

.page-about .about-line-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  opacity: .92;
}

.page-about .about-line-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 0;
  padding: 0;
}

.page-about .about-line-list li {
  padding: 5px 12px;
  font-size: 13px;
  border: 1px solid currentColor;
  border-radius: 999px;
  opacity: .88;
}

/* ---------- 研发制造 ---------- */
.page-about .about-mfg-media {
  margin: 30px 0 0;
}

.page-about .about-mfg-panel {
  padding: clamp(24px, 3.4vw, 32px);
  color: var(--paper);
  background: var(--ink-900);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 22px 100%, 0 calc(100% - 22px));
}

.page-about .about-mfg-panel h3 {
  margin: 0 0 18px;
  font-size: 19px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-mfg-list {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-mfg-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
  color: rgba(247, 245, 241, .86);
}

.page-about .about-mfg-list .num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  flex: 0 0 26px;
  font-size: 12px;
  color: var(--ink-900);
  background: var(--amber);
  border-radius: 50%;
}

/* ---------- 服务网络 ---------- */
.page-about .about-network {
  background: var(--ink-100);
}

.page-about .about-network-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-accordion {
  display: grid;
  gap: 12px;
}

.page-about .about-acc-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  width: 100%;
  padding: 16px 18px;
  font: inherit;
  font-size: 16px;
  font-weight: 600;
  text-align: left;
  color: var(--ink-900);
  background: var(--paper);
  border: 1px solid rgba(11, 26, 43, .12);
  border-left: 3px solid var(--celadon-500);
  border-radius: 0;
  cursor: pointer;
  transition: border-color .18s var(--ease), transform .18s var(--ease), box-shadow .18s var(--ease);
}

.page-about .about-acc-trigger:hover {
  transform: translateY(-2px);
  border-left-color: var(--orange-500);
  box-shadow: var(--shadow-soft);
}

.page-about .about-acc-mark {
  font-size: 12px;
  color: var(--ink-500);
}

.page-about .about-acc-panel {
  padding: 14px 18px 18px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-700);
  background: var(--paper);
  border: 1px solid rgba(11, 26, 43, .08);
  border-top: 0;
}

/* ---------- 资质 ---------- */
.page-about .about-cert-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-cert-item {
  position: relative;
  padding: 22px 22px 24px;
  background: var(--paper);
  border: 1px solid rgba(11, 26, 43, .12);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

.page-about .about-cert-item h3 {
  margin: 0 0 8px;
  font-size: 18px;
  letter-spacing: -.01em;
  color: var(--ink-900);
}

.page-about .about-cert-item h3::after {
  content: "";
  display: block;
  width: 34px;
  height: 3px;
  margin-top: 10px;
  background: var(--orange-500);
}

.page-about .about-cert-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ink-500);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  position: relative;
  padding: clamp(46px, 7vw, 92px) 0;
  background: var(--ink-900);
  color: var(--paper);
  overflow: hidden;
}

.page-about .about-eco::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(80% 70% at 12% 0%, rgba(242, 115, 63, .22), transparent 60%),
    repeating-linear-gradient(115deg, rgba(232, 237, 244, .05) 0 1px, transparent 1px 26px);
  pointer-events: none;
}

.page-about .about-eco-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 46px);
}

.page-about .about-eco-copy h2 {
  margin: 8px 0 18px;
  font-size: clamp(24px, 4.4vw, 34px);
  line-height: 1.25;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-eco-copy .eyebrow {
  color: var(--amber);
}

.page-about .about-eco-copy p {
  margin: 0;
  color: rgba(247, 245, 241, .82);
}

.page-about .about-eco-track {
  list-style: none;
  margin: 0;
  padding: 0 0 14px;
  display: flex;
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-eco-tag {
  flex: 0 0 78%;
  scroll-snap-align: start;
  display: grid;
  gap: 6px;
  padding: 22px 20px;
  background: rgba(232, 237, 244, .07);
  border: 1px solid rgba(232, 237, 244, .18);
  border-top: 3px solid var(--celadon-500);
  transition: border-color .18s var(--ease), transform .18s var(--ease), background .18s var(--ease);
}

.page-about .about-eco-tag:hover {
  transform: translateY(-3px);
  background: rgba(232, 237, 244, .12);
  border-top-color: var(--orange-500);
}

.page-about .about-eco-num {
  font-size: 26px;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-eco-tag strong {
  font-size: 16px;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-eco-desc {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(247, 245, 241, .72);
}

.page-about .about-eco-figure {
  margin: 0;
  border: 1px solid rgba(232, 237, 244, .16);
}

.page-about .about-eco-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--orange-500), var(--celadon-500));
  opacity: .45;
}

.page-about .about-node {
  position: relative;
  padding: 0 0 clamp(26px, 4vw, 42px) 30px;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--orange-500);
  box-shadow: 0 0 0 5px rgba(242, 115, 63, .16);
  animation: about-pulse 2.6s var(--ease) infinite;
}

.page-about .about-node:last-child::before {
  border-color: var(--celadon-500);
  box-shadow: 0 0 0 5px rgba(78, 156, 138, .16);
}

.page-about .about-node-mark {
  margin-bottom: 6px;
}

.page-about .about-node-mark .num {
  font-size: 22px;
  font-weight: 700;
  color: var(--orange-500);
  letter-spacing: -.01em;
}

.page-about .about-node-body h3 {
  margin: 0 0 8px;
  font-size: 20px;
  line-height: 1.35;
  letter-spacing: -.015em;
}

.page-about .about-node-body .timeline-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-500);
  max-width: 60ch;
}

.page-about .about-node-trigger {
  display: inline-flex;
  align-items: center;
  margin-top: 14px;
  padding: 7px 16px;
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-700);
  background: transparent;
  border: 1px solid rgba(11, 26, 43, .18);
  border-radius: 999px;
  cursor: pointer;
  transition: color .18s var(--ease), border-color .18s var(--ease), transform .18s var(--ease);
}

.page-about .about-node-trigger:hover {
  color: var(--orange-500);
  border-color: var(--orange-500);
  transform: translateY(-2px);
}

.page-about .about-node-panel {
  margin-top: 12px;
  padding: 14px 18px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-700);
  background: var(--ink-100);
  border-left: 3px solid var(--celadon-500);
  max-width: 66ch;
}

@keyframes about-pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(242, 115, 63, .16); }
  50% { box-shadow: 0 0 0 9px rgba(242, 115, 63, .05); }
}

/* ---------- 收束 ---------- */
.page-about .about-close {
  padding: clamp(44px, 6vw, 84px) 0 clamp(56px, 8vw, 104px);
  background: linear-gradient(180deg, var(--paper), var(--ink-100));
}

.page-about .about-close-inner {
  max-width: 72ch;
}

.page-about .about-close-inner h2 {
  margin: 0 0 16px;
  font-size: clamp(22px, 3.6vw, 30px);
  line-height: 1.3;
  letter-spacing: -.02em;
}

.page-about .about-close-inner p {
  margin: 0;
  font-size: 17px;
  line-height: 1.78;
  color: var(--ink-700);
}

.page-about .about-close-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

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

  .page-about .about-eco-tag {
    flex: 0 0 46%;
  }
}

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

  .page-about .about-lines-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-cert-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .page-about .about-eco-track {
    grid-column: 1 / -1;
  }

  .page-about .about-eco-figure {
    grid-column: 2 / 3;
    grid-row: 1 / 2;
  }

  .page-about .about-timeline::before {
    left: 118px;
  }

  .page-about .about-node {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: 0 36px;
    padding-left: 0;
  }

  .page-about .about-node::before {
    left: 111px;
    top: 10px;
  }

  .page-about .about-node-mark {
    margin-bottom: 0;
    text-align: right;
  }
}

@media (min-width: 1180px) {
  .page-about .about-eco-track {
    gap: 18px;
  }

  .page-about .about-eco-tag {
    flex: 1 1 0;
    min-width: 0;
  }

  .page-about .about-hero-facts {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node::before {
    animation: none;
  }

  .page-about .about-line-card,
  .page-about .about-eco-tag,
  .page-about .about-acc-trigger,
  .page-about .about-node-trigger {
    transition: none;
  }
}