.page-about {
  --about-edge: rgba(14, 74, 114, 0.12);
  --about-edge-soft: rgba(14, 74, 114, 0.08);
  --about-body: rgba(28, 43, 51, 0.86);
  --about-card: rgba(255, 255, 255, 0.74);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.85;
  letter-spacing: 0.01em;
}

.page-about .container {
  position: relative;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 4.5vw, 52px) 0 clamp(48px, 7vw, 92px);
  background:
    linear-gradient(135deg, var(--paper) 0%, var(--paper-cool) 100%);
  border-bottom: 1px solid var(--about-edge);
}

.page-about .about-hero-art {
  position: absolute;
  right: 0;
  bottom: 0;
  width: min(68%, 880px);
  opacity: 0.17;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(to right, transparent 0%, #000 46%);
  mask-image: linear-gradient(to right, transparent 0%, #000 46%);
}

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

.page-about .about-hero-inner {
  max-width: var(--w);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0 0 clamp(20px, 3vw, 34px);
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--rock-grey);
}

.page-about .breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  color: var(--blue-light);
}

.page-about .breadcrumb a {
  color: var(--rock);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--blue);
  border-bottom-color: var(--blue-light);
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--blue);
  margin: 0 0 14px;
}

.page-about .about-title {
  max-width: 16em;
  margin: 0 0 clamp(20px, 3vw, 30px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 5.4vw, 60px);
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-title::after {
  content: "";
  display: block;
  width: 76px;
  height: 4px;
  margin-top: 22px;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--blue) 0%, var(--wolfberry) 100%);
}

.page-about .about-lede {
  max-width: 46em;
  margin: 0 0 clamp(24px, 3.4vw, 36px);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.95;
  color: var(--about-body);
}

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

/* ---------- 时间轴区 ---------- */

.page-about .about-path {
  padding: clamp(52px, 8vw, 104px) 0 clamp(36px, 5vw, 64px);
}

.page-about .about-path-head {
  max-width: 52em;
  margin-bottom: clamp(36px, 5vw, 64px);
}

.page-about .about-path-head .display-title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1.32;
  letter-spacing: -0.015em;
  color: var(--ink);
}

.page-about .about-path-head .lede {
  margin: 0;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.95;
  color: var(--about-body);
}

.page-about .tl-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  padding-bottom: clamp(32px, 5vw, 56px);
}

.page-about .tl-item::before {
  display: none;
}

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

.page-about .tl-marker {
  display: flex;
  align-items: center;
}

.page-about .tl-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 62px;
  height: 40px;
  padding: 0 16px;
  border-radius: var(--radius-pill);
  background: var(--ink);
  color: var(--paper);
  border: 2px solid transparent;
  font-size: 13px;
  letter-spacing: 0.14em;
  transition: background-color 160ms var(--ease), color 160ms var(--ease),
    border-color 160ms var(--ease), transform 160ms var(--ease);
}

.page-about .tl-item:hover .tl-num,
.page-about .tl-item:focus-within .tl-num {
  background: var(--wolfberry-soft);
  color: var(--ink);
  border-color: var(--wolfberry);
  transform: translateY(-2px);
}

.page-about .tl-body {
  min-width: 0;
}

.page-about .tl-card {
  position: relative;
  padding: clamp(20px, 3.2vw, 38px);
  border: 1px solid var(--about-edge);
  border-radius: var(--radius-lg);
  background: var(--about-card);
  box-shadow: var(--shadow-card);
  transition: transform 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .tl-card:hover {
  transform: translateY(-2px);
  border-color: var(--blue-light);
}

.page-about .tl-title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.3vw, 26px);
  line-height: 1.38;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .tl-lead {
  margin: 0 0 12px;
  font-size: clamp(16px, 1.75vw, 18px);
  font-weight: 600;
  line-height: 1.72;
  color: var(--blue-deep);
}

.page-about .tl-text {
  margin: 0 0 12px;
  font-size: 15.5px;
  line-height: 1.92;
  color: var(--about-body);
}

.page-about .tl-text:last-child {
  margin-bottom: 0;
}

.page-about .tl-figure {
  margin: 24px 0 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--about-edge-soft);
  background: var(--blue-mist);
}

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

.page-about .tl-figure .media-caption {
  margin: 0;
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--rock-grey);
  background: var(--paper-cool);
  border-top: 1px solid var(--about-edge-soft);
}

/* ---------- 四道手的流程 ---------- */

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

.page-about .flow-item {
  position: relative;
  padding: 0 0 22px 30px;
}

.page-about .flow-item:last-child {
  padding-bottom: 0;
}

.page-about .flow-item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 7px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 0 4px var(--blue-mist);
}

.page-about .flow-item::after {
  content: "";
  position: absolute;
  left: 9px;
  top: 25px;
  bottom: 6px;
  width: 2px;
  background: var(--blue-light);
}

.page-about .flow-item:last-child::after {
  display: none;
}

.page-about .flow-item strong {
  display: block;
  margin-bottom: 4px;
  font-size: 16.5px;
  font-weight: 700;
  ackground: none;
  color: var(--blue-deep);
}

.page-about .flow-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.88;
  color: var(--about-body);
}

/* ---------- 六人分工 ---------- */

.page-about .crew {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .crew-item {
  padding: 18px 20px;
  border-radius: var(--radius-md);
  background: var(--blue-mist);
  border-left: 3px solid var(--rock);
}

.page-about .crew-role {
  display: inline-block;
  margin-bottom: 8px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--rock);
}

.page-about .crew-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.86;
  color: var(--about-body);
}

/* ---------- 覆盖范围数字 ---------- */

.page-about .reach {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .reach-item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--blue-mist) 0%, var(--paper-cool) 100%);
  border: 1px solid var(--about-edge-soft);
}

.page-about .reach-num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--blue-deep);
  letter-spacing: -0.02em;
}

.page-about .reach-num em {
  font-style: normal;
  font-size: 0.62em;
  color: var(--rock-grey);
  margin-left: 2px;
}

.page-about .reach-text {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--about-body);
}

/* ---------- 三条底线 ---------- */

.page-about .about-creed {
  position: relative;
  overflow: hidden;
  padding: clamp(52px, 8vw, 100px) 0;
  background: linear-gradient(160deg, var(--blue-deep) 0%, #0a3b5c 100%);
  color: var(--paper);
}

.page-about .about-creed::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 88% 14%, rgba(169, 207, 230, 0.24), transparent 52%),
    radial-gradient(circle at 6% 92%, rgba(228, 118, 43, 0.18), transparent 46%);
}

.page-about .about-creed .container {
  position: relative;
  z-index: 1;
}

.page-about .creed-head {
  max-width: 40em;
  margin-bottom: clamp(30px, 4vw, 52px);
}

.page-about .creed-eyebrow {
  color: var(--blue-light);
}

.page-about .creed-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.34;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .creed-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .creed-item {
  padding: 22px 22px 24px;
  border-radius: var(--radius-lg);
  background: rgba(250, 247, 242, 0.07);
  border: 1px solid rgba(169, 207, 230, 0.32);
  transition: transform 160ms var(--ease), background-color 160ms var(--ease);
}

.page-about .creed-item:hover {
  transform: translateY(-2px);
  background: rgba(250, 247, 242, 0.12);
}

.page-about .creed-item h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--wolfberry-soft);
}

.page-about .creed-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(250, 247, 242, 0.88);
}

/* ---------- 收尾 ---------- */

.page-about .about-next {
  padding: clamp(48px, 7vw, 92px) 0 clamp(56px, 8vw, 104px);
  background: linear-gradient(180deg, var(--paper) 0%, var(--paper-cool) 100%);
}

.page-about .next-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  padding: clamp(24px, 4vw, 46px);
  border-radius: var(--radius-lg);
  background: var(--paper);
  border: 1px solid var(--about-edge);
  box-shadow: var(--shadow-float);
}

.page-about .next-copy .eyebrow {
  margin-bottom: 12px;
}

.page-about .next-copy h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.2vw, 32px);
  line-height: 1.36;
  letter-spacing: -0.015em;
  color: var(--ink);
}

.page-about .next-copy p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--about-body);
}

.page-about .next-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.page-about .next-link {
  font-size: 14px;
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid var(--blue-light);
  padding-bottom: 2px;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  color: var(--wolfberry);
  border-bottom-color: var(--wolfberry);
}

/* ---------- 断点 ---------- */

@media (min-width: 680px) {
  .page-about .crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px 18px;
  }

  .page-about .crew-item:nth-child(even) {
    transform: translateY(14px);
  }

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

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

  .page-about .creed-item:last-child {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-about .tl-item {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 34px;
    padding-bottom: clamp(46px, 5.5vw, 74px);
  }

  .page-about .tl-item::before {
    display: block;
    content: "";
    position: absolute;
    left: 30px;
    top: 54px;
    bottom: 0;
    width: 2px;
    background-image: linear-gradient(to bottom, var(--dune) 0 7px, transparent 7px 15px);
    background-size: 2px 15px;
    background-repeat: repeat-y;
  }

  .page-about .tl-item:last-child::before {
    display: none;
  }

  .page-about .tl-marker {
    align-items: flex-start;
    padding-top: 8px;
  }

  .page-about .tl-item:nth-child(odd) .tl-card {
    margin-right: 42px;
  }

  .page-about .tl-item:nth-child(even) .tl-card {
    margin-left: 42px;
  }

  .page-about .next-panel {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .next-actions {
    flex-direction: column;
    align-items: stretch;
    justify-items: start;
    border-left: 2px solid var(--blue-light);
    padding-left: clamp(18px, 2.4vw, 30px);
  }

  .page-about .next-actions .btn {
    text-align: center;
  }

  .page-about .next-link {
    align-self: center;
    border-bottom-color: transparent;
  }
}

@media (min-width: 1080px) {
  .page-about .creed-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .creed-item:last-child {
    grid-column: auto;
  }

  .page-about .creed-item:nth-child(2) {
    transform: translateY(20px);
  }

  .page-about .creed-item:nth-child(2):hover {
    transform: translateY(18px);
  }

  .page-about .reach {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px 20px;
  }
}

@media (max-width: 899px) {
  .page-about .about-hero-art {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-num,
  .page-about .tl-card,
  .page-about .creed-item,
  .page-about .next-link,
  .page-about .breadcrumb a {
    transition: none;
  }

  .page-about .tl-item:hover .tl-num,
  .page-about .tl-item:focus-within .tl-num,
  .page-about .tl-card:hover,
  .page-about .creed-item:hover,
  .page-about .creed-item:nth-child(2):hover {
    transform: none;
  }
}