/* ===== 品牌故事 about 页面专属样式 ===== */

.page-about {
  background: var(--c-paper);
  color: var(--c-ink);
  overflow-x: hidden;
}

/* 面包屑 */
.page-about .breadcrumb-wrap {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: calc(var(--header-h) + 32px) var(--sp-md) 0;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-xs);
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-body);
  font-size: 14px;
}

.page-about .breadcrumb-list a {
  color: var(--c-navy);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .25s ease;
}

.page-about .breadcrumb-list a:hover {
  border-color: var(--c-neon);
}

/* 品牌起源 */
.page-about .about-origin {
  position: relative;
  padding: 64px 0 80px;
}

.page-about .about-origin::before {
  content: "2018";
  position: absolute;
  top: 40px;
  right: -30px;
  z-index: 0;
  font-family: var(--font-head);
  font-size: clamp(120px, 22vw, 260px);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 2px rgba(66, 81, 92, .14);
  pointer-events: none;
  user-select: none;
}

.page-about .origin-head {
  position: relative;
  z-index: 1;
  max-width: 860px;
  margin-bottom: 48px;
}

.page-about .origin-head .tag {
  margin-bottom: var(--sp-sm);
}

.page-about .origin-head h1 {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(38px, 8vw, 88px);
  line-height: .98;
  letter-spacing: -0.02em;
  color: var(--c-navy);
}

.page-about .origin-layout {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-about .origin-copy {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
}

.page-about .origin-lead {
  margin: 0 0 20px;
  padding-left: 16px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--c-navy);
  border-left: 4px solid var(--c-neon);
}

.page-about .origin-copy > p:not(.origin-lead) {
  margin: 0 0 16px;
}

.page-about .origin-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-sm);
  margin-top: 28px;
}

.page-about .origin-img {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 16px 48px rgba(11, 29, 43, .22);
  transform: rotate(-1.6deg);
  transition: transform .35s ease;
}

.page-about .origin-img:hover {
  transform: rotate(0deg) scale(1.01);
}

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

/* 发展里程碑 */
.page-about .about-milestones {
  position: relative;
  padding: 80px 0 88px;
  background: var(--c-navy);
  color: var(--c-paper);
}

.page-about .about-milestones .section-header {
  margin-bottom: 40px;
}

.page-about .about-milestones .section-title {
  font-family: var(--font-head);
  font-size: clamp(32px, 5vw, 56px);
  color: var(--c-white);
}

.page-about .about-milestones .section-subtitle {
  color: rgba(245, 233, 215, .72);
}

.page-about .milestone-visual {
  margin: 0 0 56px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 14px 40px rgba(0, 0, 0, .3);
}

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

.page-about .milestone-list {
  margin: 0;
  padding: 0;
  list-style: none;
  position: relative;
}

.page-about .milestone-list::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-neon) 0%, rgba(57, 255, 20, .15) 100%);
}

.page-about .milestone-item {
  position: relative;
  padding-left: 52px;
  margin-bottom: 40px;
}

.page-about .milestone-item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--c-neon);
  box-shadow: 0 0 0 5px rgba(57, 255, 20, .2);
}

.page-about .milestone-year {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-head);
  font-size: 28px;
  color: var(--c-neon);
  letter-spacing: .02em;
}

.page-about .milestone-content {
  padding: 20px 22px;
  border-radius: var(--radius-md);
  background: rgba(245, 233, 215, .96);
  color: var(--c-ink);
  box-shadow: 0 6px 20px rgba(0, 0, 0, .18);
  transition: transform .28s ease, box-shadow .28s ease;
}

.page-about .milestone-content:hover {
  transform: translateX(6px);
  box-shadow: 0 10px 32px rgba(57, 255, 20, .18);
}

.page-about .milestone-content h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 18px;
  color: var(--c-navy);
}

.page-about .milestone-content p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
}

/* 内容中心评测体系 */
.page-about .about-system {
  padding: 72px 0 80px;
  background: var(--c-white);
}

.page-about .about-system .section-header {
  margin-bottom: 40px;
}

.page-about .about-system .section-title {
  font-family: var(--font-head);
  font-size: clamp(28px, 4.4vw, 48px);
  color: var(--c-navy);
}

.page-about .about-system .section-subtitle {
  color: rgba(29, 29, 27, .62);
}

.page-about .system-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}

.page-about .system-img {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 12px 36px rgba(11, 29, 43, .16);
}

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

.page-about .system-content {
  display: grid;
  gap: 20px;
}

.page-about .system-card {
  padding: 24px;
  border: 1px solid var(--c-grayblue);
  border-radius: var(--radius-md);
  background: var(--c-white);
  box-shadow: 0 4px 16px rgba(11, 29, 43, .06);
}

.page-about .system-card h3 {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: 20px;
  color: var(--c-navy);
}

.page-about .dimension-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: dim;
}

.page-about .dimension-list li {
  counter-increment: dim;
  position: relative;
  padding-left: 32px;
  margin-bottom: 10px;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.6;
}

.page-about .dimension-list li::before {
  content: counter(dim, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-head);
  font-size: 14px;
  color: var(--c-orange);
}

.page-about .system-card > p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .about-system .btn {
  justify-self: start;
}

/* 平板与多端适配 */
.page-about .about-devices {
  padding: 72px 0 80px;
  background: var(--c-paper);
}

.page-about .about-devices .section-header {
  margin-bottom: 40px;
}

.page-about .about-devices .section-title {
  font-family: var(--font-head);
  font-size: clamp(28px, 4.4vw, 48px);
  color: var(--c-navy);
}

.page-about .device-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .device-card {
  position: relative;
  padding: 32px 24px 24px;
  border: 1px solid rgba(208, 217, 224, .9);
  border-radius: var(--radius-md);
  background: var(--c-white);
  overflow: hidden;
}

.page-about .device-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--c-neon), var(--c-orange));
  opacity: .8;
}

.page-about .device-num {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-head);
  font-size: 14px;
  color: var(--c-orange);
  letter-spacing: .12em;
}

.page-about .device-card h3 {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: 20px;
  line-height: 1.3;
  color: var(--c-navy);
}

.page-about .device-card p {
  margin: 0 0 20px;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.75;
  color: rgba(29, 29, 27, .82);
}

.page-about .device-card .btn {
  margin-top: 4px;
}

/* 团队与服务承诺 */
.page-about .about-team {
  padding: 72px 0 80px;
  background: var(--c-navy);
  color: var(--c-paper);
}

.page-about .about-team .section-header {
  margin-bottom: 40px;
}

.page-about .about-team .section-title {
  font-family: var(--font-head);
  font-size: clamp(28px, 4.4vw, 48px);
  color: var(--c-white);
}

.page-about .about-team .section-subtitle {
  color: rgba(245, 233, 215, .72);
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .team-stats-card {
  padding: 28px 24px;
  border-radius: var(--radius-md);
  background: rgba(245, 233, 215, .96);
  color: var(--c-ink);
}

.page-about .stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.page-about .stat-item {
  border-left: 3px solid var(--c-neon);
  padding-left: 12px;
}

.page-about .stat-label {
  display: block;
  font-family: var(--font-body);
  font-size: 13px;
  color: rgba(29, 29, 27, .65);
  margin-bottom: 4px;
}

.page-about .stat-number {
  display: block;
  font-family: var(--font-head);
  font-size: 32px;
  line-height: 1.1;
  color: var(--c-navy);
}

.page-about .team-text {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .team-text p {
  margin: 0 0 16px;
}

.page-about .team-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.page-about .team-trust {
  margin-top: 48px;
  padding: 20px 24px;
  border: 1px solid rgba(208, 217, 224, .28);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, .04);
}

.page-about .team-trust p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  color: rgba(245, 233, 215, .88);
}

/* 时间线条目进入动画 */
@keyframes about-milestone-in {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-about .milestone-item {
  animation: about-milestone-in .5s ease both;
}

.page-about .milestone-item:nth-child(1) {
  animation-delay: .1s;
}

.page-about .milestone-item:nth-child(2) {
  animation-delay: .2s;
}

.page-about .milestone-item:nth-child(3) {
  animation-delay: .3s;
}

.page-about .milestone-item:nth-child(4) {
  animation-delay: .4s;
}

.page-about .milestone-item:nth-child(5) {
  animation-delay: .5s;
}

/* 桌面端布局 */
@media (min-width: 768px) {
  .page-about .origin-layout {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 60px;
    align-items: center;
  }

  .page-about .origin-img {
    transform: rotate(1.2deg);
  }

  .page-about .origin-img:hover {
    transform: rotate(0deg) scale(1.01);
  }

  .page-about .about-milestones {
    padding: 96px 0 104px;
  }

  .page-about .milestone-list::before {
    left: 100px;
  }

  .page-about .milestone-item {
    display: grid;
    grid-template-columns: 120px 56px 1fr;
    align-items: start;
    padding-left: 0;
    margin-bottom: 36px;
  }

  .page-about .milestone-item::before {
    left: auto;
    top: auto;
    grid-column: 2;
    justify-self: center;
    margin-top: 6px;
  }

  .page-about .milestone-year {
    grid-column: 1;
    text-align: right;
    font-size: 32px;
  }

  .page-about .milestone-content {
    grid-column: 3;
    max-width: 68%;
    transition: transform .28s ease, box-shadow .28s ease, max-width .3s ease;
  }

  .page-about .milestone-item:nth-child(even) .milestone-content {
    max-width: 82%;
  }

  .page-about .milestone-content:hover {
    transform: translateX(8px);
    max-width: 88%;
  }

  .page-about .system-layout {
    grid-template-columns: 0.85fr 1.15fr;
    gap: 56px;
  }

  .page-about .device-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
  }

  .page-about .device-card:nth-child(2) {
    transform: translateY(24px);
  }

  .page-about .team-grid {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 56px;
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .origin-head h1 {
    font-size: 88px;
  }

  .page-about .milestone-content {
    max-width: 72%;
  }

  .page-about .milestone-item:nth-child(even) .milestone-content {
    max-width: 86%;
  }
}

/* 减少动态偏好 */
@media (prefers-reduced-motion: reduce) {
  .page-about .milestone-item {
    animation: none;
  }

  .page-about .origin-img,
  .page-about .device-card:nth-child(2) {
    transform: none;
  }

  .page-about .origin-img,
  .page-about .origin-copy,
  .page-about .milestone-content,
  .page-about .system-card,
  .page-about .device-card {
    transition: none;
  }
}