/* ========== page-about 基础 ========== */
.page-about {
  position: relative;
  overflow-x: hidden;
  background: var(--color-bg);
}

.page-about::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(29, 53, 87, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(29, 53, 87, .035) 1px, transparent 1px);
  background-size: 72px 72px;
  pointer-events: none;
  z-index: 0;
}

.page-about > * {
  position: relative;
  z-index: 1;
}

.page-about img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
}

/* ========== 面包屑 ========== */
.page-about__crumb-wrap {
  padding-top: 22px;
  padding-bottom: 4px;
}

/* ========== 品牌故事 ========== */
.page-about__story {
  padding: clamp(48px, 7vw, 88px) 0 60px;
  background: linear-gradient(135deg, var(--color-red-soft) 0%, var(--color-white) 62%, var(--color-blue-soft) 100%);
}

.page-about__story-copy h1 {
  font-family: var(--font-body);
  font-size: clamp(30px, 4.6vw, 54px);
  line-height: 1.15;
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--color-dark);
  margin: 10px 0 20px;
}

.page-about__story-lead {
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.75;
  color: var(--color-gray-dark);
  border-left: 4px solid var(--color-red);
  padding-left: 18px;
  margin: 0 0 20px;
}

.page-about__story-copy > p:not(.page-about__story-lead) {
  color: var(--color-gray-dark);
  line-height: 1.8;
  max-width: 640px;
}

.page-about__story-route {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 28px 0 22px;
  font-family: var(--font-mono);
  font-weight: 700;
}

.page-about__route-start,
.page-about__route-end {
  font-size: 18px;
  letter-spacing: .04em;
  color: var(--color-dark);
}

.page-about__route-start::before {
  content: '';
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-red);
  margin-right: 8px;
}

.page-about__route-end::after {
  content: '';
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-blue);
  margin-left: 8px;
}

.page-about__route-track {
  flex: 1;
  height: 4px;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--color-red), var(--color-yellow) 55%, var(--color-blue));
  min-width: 56px;
}

.page-about__story-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 34px;
}

.page-about__metric {
  background: var(--color-white);
  border-radius: 14px;
  padding: 18px 16px;
  border-top: 4px solid var(--color-red);
  box-shadow: var(--shadow-card);
  min-width: 0;
}

.page-about__metric:nth-child(2) {
  border-top-color: var(--color-blue);
}

.page-about__metric-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 40px);
  font-weight: 800;
  line-height: 1.1;
  color: var(--color-red);
  letter-spacing: -.02em;
}

.page-about__metric:nth-child(2) .page-about__metric-num {
  color: var(--color-blue);
}

.page-about__metric-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  color: var(--color-gray-dark);
  line-height: 1.5;
}

/* ========== 章节标题通用 ========== */
.page-about__section-head {
  margin-bottom: 38px;
}

.page-about__section-head h2 {
  font-size: clamp(26px, 3.6vw, 44px);
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--color-dark);
  margin: 8px 0 12px;
}

.page-about__section-head > p:last-child {
  color: var(--color-gray-dark);
  max-width: 580px;
  line-height: 1.75;
}

/* ========== 发展里程碑 ========== */
.page-about__milestones {
  padding: clamp(56px, 8vw, 96px) 0;
  background: var(--color-white);
}

.page-about__timeline {
  position: relative;
  padding-left: 36px;
  max-width: 880px;
}

.page-about__timeline::before {
  content: '';
  position: absolute;
  left: 16px;
  top: 18px;
  bottom: 18px;
  width: 4px;
  border-radius: 4px;
  background: linear-gradient(var(--color-blue), rgba(29, 53, 87, .12));
}

.page-about__node {
  position: relative;
  padding-bottom: 30px;
}

.page-about__node::before {
  content: '';
  position: absolute;
  left: -29px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-red);
  border: 3px solid var(--color-white);
  box-shadow: 0 0 0 2px var(--color-red), 0 4px 12px rgba(230, 57, 70, .32);
  z-index: 2;
}

.page-about__node-marker {
  margin-bottom: 8px;
}

.page-about__node-year {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: .08em;
  color: var(--color-red);
  background: var(--color-red-soft);
  border: 1px solid rgba(230, 57, 70, .28);
  border-radius: 8px;
  padding: 4px 12px;
}

.page-about__node-content {
  background: var(--color-white);
  border-radius: 16px;
  padding: 22px 22px 20px;
  border-left: 4px solid var(--color-red);
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition), transform var(--transition);
}

.page-about__node:hover .page-about__node-content {
  box-shadow: var(--shadow-float);
  transform: translateY(-2px);
}

.page-about__node-content h3 {
  font-size: 20px;
  font-weight: 900;
  color: var(--color-dark);
  margin: 0 0 8px;
}

.page-about__node-content > p {
  color: var(--color-gray-dark);
  line-height: 1.75;
  margin: 0 0 14px;
}

.page-about__node-more {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.page-about__node-toggle {
  font-size: 14px;
}

.page-about__node-detail.panel {
  display: none;
  margin-top: 14px;
}

.page-about__node-detail.panel.is-open {
  display: block;
  animation: page-about-detail-in .3s ease;
}

@keyframes page-about-detail-in {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-about__node-detail .panel-body-inner {
  background: var(--color-bg);
  border-radius: 10px;
  padding: 16px 18px;
}

.page-about__node-detail p {
  color: var(--color-gray-dark);
  line-height: 1.8;
  margin: 0;
  font-size: 15px;
}

/* ========== 里程碑配图 ========== */
.page-about__timeline-figure {
  margin: 44px 0 0;
  max-width: 860px;
}

.page-about__timeline-figure img {
  width: 100%;
  object-fit: cover;
  box-shadow: var(--shadow-card);
  border-radius: 18px;
}

.page-about__timeline-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--color-gray-dark);
  letter-spacing: .02em;
}

/* ========== 资质与认证 ========== */
.page-about__credentials {
  background: var(--color-blue);
  padding: clamp(48px, 7vw, 88px) 0;
  color: var(--color-white);
}

.page-about__credentials .page-about__section-head h2 {
  color: var(--color-white);
}

.page-about__credentials .page-about__section-head > p:last-child {
  color: rgba(255, 255, 255, .78);
}

.page-about__credential-wrap {
  display: grid;
  gap: 34px;
  align-items: center;
}

.page-about__credential-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about__credential-card {
  position: relative;
  background: var(--color-white);
  border-radius: 16px;
  padding: 24px 22px 22px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition);
  overflow: hidden;
}

.page-about__credential-card::after {
  content: '';
  position: absolute;
  right: -18px;
  top: -18px;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--color-red);
  opacity: .08;
  pointer-events: none;
}

.page-about__credential-card:nth-child(2)::after {
  background: var(--color-blue);
}

.page-about__credential-card:nth-child(3)::after {
  background: var(--color-red);
}

.page-about__credential-card:nth-child(4)::after {
  background: var(--color-yellow);
}

.page-about__credential-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-float);
}

.page-about__credential-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: var(--color-red-soft);
  margin-bottom: 16px;
  transition: transform var(--transition);
}

.page-about__credential-card:hover .page-about__credential-icon {
  transform: scale(1.08) rotate(-2deg);
}

.page-about__credential-icon svg {
  width: 34px;
  height: 34px;
  display: block;
  color: var(--color-red);
}

.page-about__credential-card:nth-child(2) .page-about__credential-icon {
  background: var(--color-blue-soft);
}

.page-about__credential-card:nth-child(2) .page-about__credential-icon svg {
  color: var(--color-blue);
}

.page-about__credential-card:nth-child(3) .page-about__credential-icon {
  background: var(--color-red-soft);
}

.page-about__credential-card:nth-child(4) .page-about__credential-icon {
  background: #FFF7D6;
}

.page-about__credential-card:nth-child(4) .page-about__credential-icon svg {
  color: var(--color-yellow);
}

.page-about__credential-card h3 {
  font-size: 18px;
  font-weight: 900;
  color: var(--color-dark);
  margin: 0 0 8px;
}

.page-about__credential-card p {
  color: var(--color-gray-dark);
  line-height: 1.7;
  font-size: 14px;
  margin: 0;
}

/* ========== 图标 SVG 样式 ========== */
.page-about__icon-soft {
  fill: currentColor;
  opacity: .12;
  stroke: none;
}

.page-about__icon-stroke {
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.page-about__icon-check {
  fill: none;
  stroke: currentColor;
  stroke-width: 2.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.page-about__icon-line {
  fill: none;
  stroke: currentColor;
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ========== 资质配图 ========== */
.page-about__credential-figure {
  margin: 0;
  text-align: center;
}

.page-about__credential-figure img {
  max-width: 420px;
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  box-shadow: 0 20px 50px rgba(0, 0, 0, .22);
  border-radius: 28px;
}

.page-about__credential-figure figcaption {
  margin-top: 12px;
  color: rgba(255, 255, 255, .78);
  font-size: 13px;
  letter-spacing: .02em;
}

/* ========== 团队与文化 ========== */
.page-about__culture {
  padding: clamp(48px, 7vw, 88px) 0;
  background: var(--color-bg);
}

.page-about__culture-grid {
  display: grid;
  gap: 34px;
  grid-template-columns: 1fr;
}

.page-about__culture-copy {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  align-content: start;
}

.page-about__culture-stat {
  background: var(--color-white);
  border-radius: 16px;
  padding: 20px 18px;
  border-left: 4px solid var(--color-red);
  box-shadow: var(--shadow-card);
}

.page-about__culture-stat:nth-child(2) {
  border-left-color: var(--color-blue);
}

.page-about__culture-stat:nth-child(3) {
  border-left-color: var(--color-yellow);
}

.page-about__culture-stat:nth-child(4) {
  border-left-color: var(--color-dark);
}

.page-about__culture-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.15;
  color: var(--color-red);
}

.page-about__culture-stat:nth-child(2) .page-about__culture-num {
  color: var(--color-blue);
}

.page-about__culture-stat:nth-child(3) .page-about__culture-num {
  color: var(--color-yellow);
  text-shadow: 0 1px 0 rgba(255, 255, 255, .6);
}

.page-about__culture-stat:nth-child(4) .page-about__culture-num {
  color: var(--color-dark);
}

.page-about__culture-stat p {
  margin: 8px 0 0;
  color: var(--color-gray-dark);
  font-size: 13px;
  line-height: 1.6;
}

.page-about__culture-text h3 {
  font-size: 20px;
  font-weight: 900;
  color: var(--color-dark);
  margin: 0 0 12px;
}

.page-about__culture-text h3::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 18px;
  border-radius: 3px;
  background: var(--color-red);
  margin-right: 10px;
  vertical-align: -3px;
}

.page-about__culture-text > p {
  color: var(--color-gray-dark);
  line-height: 1.8;
  margin: 0 0 20px;
}

.page-about__culture-list {
  list-style: none;
  padding: 0;
  margin: 0 0 22px;
}

.page-about__culture-list li {
  position: relative;
  padding-left: 22px;
  color: var(--color-gray-dark);
  line-height: 1.7;
  font-size: 15px;
  margin-bottom: 10px;
}

.page-about__culture-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: .7em;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-blue);
}

.page-about__culture-list strong {
  color: var(--color-dark);
  font-weight: 700;
}

.page-about__culture-figure {
  margin: 26px 0 0;
}

.page-about__culture-figure img {
  width: 100%;
  max-width: 620px;
  object-fit: cover;
  box-shadow: var(--shadow-card);
  border-radius: 18px;
}

.page-about__culture-cta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 40px;
}

/* ========== 桌面端增强 ========== */
@media (min-width: 900px) {
  .page-about__story-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.45fr) minmax(280px, .75fr);
    gap: clamp(40px, 5vw, 80px);
    align-items: start;
  }

  .page-about__story-metrics {
    margin-top: 64px;
  }

  .page-about__milestones .page-about__section-head,
  .page-about__credentials .page-about__section-head,
  .page-about__culture .page-about__section-head {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
    gap: 28px;
    align-items: end;
  }

  .page-about__section-head h2 {
    margin-bottom: 0;
  }

  .page-about__timeline {
    padding-left: 64px;
  }

  .page-about__timeline::before {
    left: 28px;
  }

  .page-about__node::before {
    left: -48px;
    top: 20px;
    width: 20px;
    height: 20px;
  }

  .page-about__node {
    display: grid;
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 30px;
    align-items: start;
  }

  .page-about__node-marker {
    margin-bottom: 0;
    text-align: right;
    padding-top: 14px;
  }

  .page-about__node-year {
    display: inline-block;
    font-size: 22px;
    background: var(--color-red);
    color: var(--color-white);
    border: none;
    padding: 6px 16px;
    box-shadow: 0 6px 18px rgba(230, 57, 70, .24);
  }

  .page-about__node-content {
    min-height: 120px;
  }

  .page-about__credential-wrap {
    grid-template-columns: minmax(0, 1.35fr) minmax(260px, .65fr);
    gap: 48px;
  }

  .page-about__credential-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about__credential-card {
    padding: 26px 24px 24px;
  }

  .page-about__culture-grid {
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
    gap: clamp(40px, 5vw, 64px);
    align-items: start;
  }

  .page-about__culture-copy {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .page-about__culture-figure img {
    max-width: 680px;
  }

  .page-about__culture-cta {
    margin-left: auto;
    justify-content: flex-end;
  }
}

@media (min-width: 1240px) {
  .page-about__story-grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(340px, .7fr);
  }

  .page-about__story-lead {
    font-size: 21px;
  }

  .page-about__timeline {
    max-width: 980px;
  }

  .page-about__credential-card {
    padding: 30px 28px 26px;
  }

  .page-about__culture-text {
    padding-right: 6vw;
  }
}