.page-about {
  --pa-cut: 18px;
  --pa-chamfer: polygon(0 0, calc(100% - var(--pa-cut)) 0, 100% var(--pa-cut), 100% 100%, var(--pa-cut) 100%, 0 calc(100% - var(--pa-cut)));
  --pa-gap: clamp(52px, 12vw, 104px);
  --pa-pad: clamp(18px, 2.6vw, 30px);
  display: block;
  background: var(--c-deep);
  color: var(--c-cream);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  min-height: clamp(460px, 74vh, 720px);
  display: flex;
  align-items: flex-end;
  padding: calc(var(--header-h) + clamp(56px, 12vw, 120px)) 0 clamp(48px, 7vw, 88px);
  overflow: hidden;
  isolation: isolate;
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 58%;
  opacity: 0.4;
  filter: saturate(0.7) contrast(1.06);
}

.page-about .about-hero__grade {
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    radial-gradient(112% 70% at 14% 4%, rgba(31, 242, 208, 0.18), transparent 58%),
    radial-gradient(82% 62% at 92% 96%, rgba(255, 107, 74, 0.16), transparent 62%),
    linear-gradient(to top, var(--c-deep) 8%, rgba(8, 24, 38, 0.62) 62%, rgba(8, 24, 38, 0.9) 100%);
}

.page-about .about-hero__grade::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(to bottom, rgba(237, 232, 220, 0.05) 0 1px, transparent 1px 4px);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: clamp(20px, 3.4vw, 34px);
}

.page-about .about-hero__title {
  margin: 8px 0 18px;
  max-width: 17ch;
  font-family: var(--font-display);
  font-size: clamp(2rem, 5.8vw, 4.5rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--c-cream);
  text-wrap: balance;
}

.page-about .about-hero__lede {
  max-width: 620px;
  font-size: clamp(1rem, 1.5vw, 1.1rem);
  line-height: 1.85;
  color: rgba(237, 232, 220, 0.82);
}

/* ---------- 时间轴轨道 ---------- */
.page-about .about-track {
  position: relative;
  padding: clamp(56px, 9vw, 104px) 0 clamp(64px, 10vw, 120px);
  background:
    radial-gradient(80% 36% at 100% 0%, rgba(15, 166, 143, 0.12), transparent 62%),
    radial-gradient(70% 30% at 0% 100%, rgba(196, 121, 79, 0.1), transparent 60%),
    var(--c-deep);
}

.page-about .about-step {
  position: relative;
  padding-left: 52px;
  padding-bottom: var(--pa-gap);
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 8px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--c-cyan) 0%, var(--c-line) 16%, rgba(27, 60, 90, 0.16) 100%);
}

.page-about .about-step:last-of-type::before,
.page-about .about-step--last::before {
  background: linear-gradient(to bottom, var(--c-cyan) 0%, var(--c-line) 22%, rgba(27, 60, 90, 0) 90%);
}

.page-about .about-step__stage {
  position: absolute;
  left: 0;
  top: 0;
  width: 30px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  z-index: 1;
}

.page-about .about-step__dot {
  flex: none;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-deep);
  border: 2px solid var(--c-carrot, var(--c-cyan));
  border-color: var(--c-cyan);
  box-shadow: 0 0 0 4px rgba(31, 242, 208, 0.1);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .about-step:hover .about-step__dot {
  transform: scale(1.35);
  background: var(--c-cyan);
  box-shadow: 0 0 0 8px rgba(31, 242, 208, 0.16);
}

.page-about .about-step__index {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.22em;
  line-height: 1;
  color: var(--c-cyan);
  writing-mode: vertical-rl;
  text-orientation: upright;
  background: var(--c-deep);
  padding: 6px 1px;
}

.page-about .about-step__lead {
  margin: 12px 0 0;
  max-width: 720px;
  font-size: clamp(1rem, 1.35vw, 1.08rem);
  line-height: 1.85;
  color: rgba(237, 232, 220, 0.86);
}

.page-about .about-prose {
  margin-top: 18px;
  max-width: 760px;
}

.page-about .about-prose p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.9;
  color: rgba(237, 232, 220, 0.74);
}

.page-about .about-prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 数据卡 ---------- */
.page-about .about-facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(22px, 3.4vw, 38px);
  background: var(--c-line);
  border: 1px solid var(--c-line);
  overflow: hidden;
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: var(--pa-pad);
  background: var(--c-deep-2);
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 3.6vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-coral);
  font-variant-numeric: tabular-nums;
}

.page-about .about-fact__u {
  margin-left: 3px;
  font-size: 0.46em;
  font-weight: 500;
  color: var(--c-rock);
  letter-spacing: 0.02em;
}

.page-about .about-fact__label {
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--c-rock);
}

/* ---------- 双栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.6vw, 40px);
  margin-top: clamp(18px, 2.6vw, 28px);
}

.page-about .about-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-list__item {
  padding: 18px 20px;
  background: linear-gradient(90deg, rgba(31, 242, 208, 0.09) 0%, rgba(14, 42, 69, 0.92) 44%);
  clip-path: var(--pa-chamfer);
  transition: background 0.35s var(--ease);
}

.page-about .about-list__item:hover {
  background: linear-gradient(90deg, rgba(31, 242, 208, 0.2) 0%, rgba(14, 42, 69, 0.96) 48%);
}

.page-about .about-list__item p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: rgba(237, 232, 220, 0.76);
}

.page-about .about-split__media {
  margin: 0;
}

/* ---------- 三层归档 ---------- */
.page-about .about-index {
  margin-top: clamp(26px, 3.6vw, 42px);
  padding: clamp(20px, 2.8vw, 30px);
  background: var(--c-deep-2);
  border-top: 2px solid var(--c-cyan-deep);
  clip-path: var(--pa-chamfer);
}

.page-about .about-index__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
  overflow: hidden;
}

.page-about .about-index__item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 16px;
  background: var(--c-deep);
}

.page-about .about-index__key {
  flex: none;
  width: 62px;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--c-yellow);
}

.page-about .about-index__val {
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(237, 232, 220, 0.78);
}

.page-about .about-index__note {
  margin: 16px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--c-rock);
}

.page-about .about-index__note a,
.page-about .about-region__note a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(31, 242, 208, 0.4);
  transition: border-color 0.3s var(--ease), color 0.3s var(--ease);
}

.page-about .about-index__note a:hover,
.page-about .about-region__note a:hover {
  border-bottom-color: var(--c-cyan);
}

/* ---------- 编辑流程 ---------- */
.page-about .about-flow {
  margin-top: clamp(20px, 3vw, 32px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 30px);
}

.page-about .about-flow__media {
  position: relative;
  overflow: hidden;
  clip-path: var(--pa-chamfer);
  border: 1px solid var(--c-line);
  background: var(--c-deep-2);
  min-height: 190px;
}

.page-about .about-flow__media img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 190px;
  object-fit: cover;
  object-position: center;
  opacity: 0.72;
  filter: saturate(0.8);
}

.page-about .about-flow__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
  overflow: hidden;
}

.page-about .about-flow__step {
  display: flex;
  gap: 14px;
  padding: clamp(16px, 2.2vw, 22px);
  background: var(--c-deep-2);
  transition: background 0.32s var(--ease);
}

.page-about .about-flow__step:hover {
  background: #102f4d;
}

.page-about .about-flow__no {
  flex: none;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--c-yellow);
  padding-top: 3px;
}

.page-about .about-flow__name {
  margin: 0 0 6px;
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-cream);
}

.page-about .about-flow__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(237, 232, 220, 0.72);
}

.page-about .about-flow__out {
  margin: 10px 0 0;
  padding-left: 10px;
  border-left: 2px solid var(--c-cyan-deep);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  line-height: 1.7;
  color: var(--c-cyan);
}

/* ---------- 中段呼吸区 ---------- */
.page-about .about-breath {
  position: relative;
  margin: 0 0 var(--pa-gap);
  padding: clamp(40px, 7vw, 84px) 0;
  background: linear-gradient(135deg, #0a1f33 0%, #0e2a45 52%, #0a1f33 100%);
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
  overflow: hidden;
}

.page-about .about-breath__glow {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(60% 120% at 20% 0%, rgba(31, 242, 208, 0.16), transparent 62%),
    radial-gradient(50% 120% at 88% 100%, rgba(255, 201, 60, 0.12), transparent 64%);
  pointer-events: none;
}

.page-about .about-breath__glow::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(to bottom, rgba(237, 232, 220, 0.045) 0 1px, transparent 1px 4px);
}

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

.page-about .about-breath__title {
  margin: 8px 0 0;
  color: var(--c-cream);
}

.page-about .about-breath__lede {
  max-width: 700px;
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(237, 232, 220, 0.76);
}

.page-about .about-breath__ruler {
  position: relative;
  height: 78px;
  margin-top: clamp(26px, 4vw, 44px);
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
  background-image: repeating-linear-gradient(90deg, rgba(27, 60, 90, 0.9) 0 1px, transparent 1px 22px);
}

.page-about .about-breath__mark {
  position: absolute;
  top: -5px;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.page-about .about-breath__mark::before {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-yellow);
  box-shadow: 0 0 0 3px rgba(255, 201, 60, 0.18);
}

.page-about .about-breath__mark em {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-style: normal;
  letter-spacing: 0.08em;
  color: var(--c-rock);
  white-space: nowrap;
}

.page-about .about-breath__mark--end::before {
  background: var(--c-coral);
  box-shadow: 0 0 0 3px rgba(255, 107, 74, 0.2);
}

.page-about .about-breath__pair {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(22px, 3.2vw, 34px);
  background: rgba(27, 60, 90, 0.9);
  border: 1px solid var(--c-line);
  overflow: hidden;
}

.page-about .about-breath__cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(16px, 2.2vw, 24px);
  background: rgba(8, 24, 38, 0.72);
}

.page-about .about-breath__num {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3.4vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-breath__cell--coral .about-breath__num {
  color: var(--c-coral);
}

.page-about .about-breath__cell--yellow .about-breath__num {
  color: var(--c-yellow);
}

.page-about .about-breath__u {
  margin-left: 3px;
  font-size: 0.46em;
  font-weight: 500;
  color: var(--c-rock);
}

.page-about .about-breath__cap {
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--c-rock);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(20px, 3vw, 32px);
  background: var(--c-line);
  border: 1px solid var(--c-line);
  overflow: hidden;
}

.page-about .about-team__card {
  padding: clamp(20px, 2.8vw, 30px);
  background: var(--c-deep-2);
  transition: background 0.32s var(--ease);
}

.page-about .about-team__card:hover {
  background: #102f4d;
}

.page-about .about-team__role {
  margin: 14px 0 12px;
  font-family: var(--font-heading);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--c-cream);
}

.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .about-team__list li {
  position: relative;
  padding-left: 14px;
  font-size: 13.5px;
  line-height: 1.78;
  color: rgba(237, 232, 220, 0.7);
}

.page-about .about-team__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--c-cyan-deep);
}

/* ---------- 区域 ---------- */
.page-about .about-region {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(12px, 2vw, 18px);
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-region__item {
  position: relative;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--c-deep-2);
  border-bottom: 2px solid var(--c-clay);
  clip-path: var(--pa-chamfer);
  transition: border-color 0.32s var(--ease), background 0.32s var(--ease);
}

.page-about .about-region__item:hover {
  border-bottom-color: var(--c-yellow);
  background: #102f4d;
}

.page-about .about-region__city {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 2.6vw, 1.75rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1;
  color: var(--c-yellow);
}

.page-about .about-region__text {
  margin: 14px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(237, 232, 220, 0.76);
}

.page-about .about-region__note {
  margin: 18px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--c-rock);
}

/* ---------- 合作 ---------- */
.page-about .about-coop {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(12px, 2vw, 18px);
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-coop__card {
  position: relative;
  padding: clamp(20px, 2.8vw, 30px) clamp(18px, 2.4vw, 26px) clamp(18px, 2.4vw, 26px);
  background: var(--c-deep-2);
  border: 1px solid var(--c-line);
  clip-path: var(--pa-chamfer);
  transition: border-color 0.32s var(--ease), background 0.32s var(--ease);
}

.page-about .about-coop__card:hover {
  border-color: var(--c-cyan);
  background: #0f3251;
}

.page-about .about-coop__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.24em;
  color: var(--c-cyan);
}

.page-about .about-coop__title {
  margin: 12px 0 10px;
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--c-cream);
}

.page-about .about-coop__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(237, 232, 220, 0.72);
}

/* ---------- 收尾 ---------- */
.page-about .about-end {
  margin-top: clamp(28px, 4vw, 46px);
  padding: clamp(22px, 3vw, 34px);
  background: linear-gradient(120deg, rgba(31, 242, 208, 0.08) 0%, rgba(14, 42, 69, 0.9) 46%, rgba(8, 24, 38, 0.95) 100%);
  border-left: 3px solid var(--c-cyan);
}

.page-about .about-end__text p {
  margin: 0;
  max-width: 720px;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(237, 232, 220, 0.82);
}

.page-about .about-end__text a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(31, 242, 208, 0.42);
  transition: border-color 0.3s var(--ease);
}

.page-about .about-end__text a:hover {
  border-bottom-color: var(--c-cyan);
}

.page-about .about-end__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

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

  .page-about .about-breath__pair {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-region {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 800px) {
  .page-about .about-step {
    padding-left: 82px;
  }

  .page-about .about-step::before {
    left: 21px;
  }

  .page-about .about-step__stage {
    width: 44px;
  }

  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-coop {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
    gap: clamp(28px, 3.6vw, 48px);
  }

  .page-about .about-flow {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    align-items: start;
    gap: clamp(24px, 3vw, 40px);
  }

  .page-about .about-flow__media {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    min-height: 340px;
  }

  .page-about .about-flow__media img {
    min-height: 340px;
  }

  .page-about .about-end {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    justify-content: space-between;
    gap: 24px;
  }

  .page-about .about-end__text {
    flex: 1 1 420px;
  }

  .page-about .about-end__actions {
    margin-top: 0;
    flex: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-step__dot,
  .page-about .about-list__item,
  .page-about .about-flow__step,
  .page-about .about-team__card,
  .page-about .about-region__item,
  .page-about .about-coop__card,
  .page-about .about-index__note a,
  .page-about .about-end__text a {
    transition: none;
  }

  .page-about .about-step:hover .about-step__dot {
    transform: none;
  }
}
</main>

.page-about {
  --c-carrot: currentColor;
}