.page-about {
  --about-line: rgba(42, 69, 112, .55);
  --about-line-soft: rgba(42, 69, 112, .28);
  --about-rail-w: 200px;
  background: var(--sea-900);
  color: var(--foam);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 40px 0 56px;
  background:
    radial-gradient(120% 90% at 88% 8%, rgba(255, 77, 28, .22) 0%, rgba(255, 77, 28, 0) 55%),
    radial-gradient(90% 80% at 4% 96%, rgba(40, 224, 224, .16) 0%, rgba(40, 224, 224, 0) 60%),
    linear-gradient(165deg, var(--sea-900) 0%, var(--sea-800) 45%, var(--bridge) 100%);
}

.page-about .about-hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--about-line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--about-line-soft) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(160deg, #000 0%, rgba(0, 0, 0, .35) 60%, transparent 100%);
  -webkit-mask-image: linear-gradient(160deg, #000 0%, rgba(0, 0, 0, .35) 60%, transparent 100%);
  pointer-events: none;
}

.page-about .about-hero__wash {
  position: absolute;
  right: -18%;
  top: -30%;
  width: 78%;
  height: 130%;
  border-radius: 50%;
  opacity: .45;
  pointer-events: none;
}

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

.page-about .about-hero__crumb {
  font-size: 13px;
  color: var(--text-dim-2);
  margin-bottom: 26px;
}
.page-about .about-hero__crumb a {
  color: var(--cyan);
  text-decoration: none;
}
.page-about .about-hero__crumb a:hover {
  text-decoration: underline;
}
.page-about .about-hero__crumb [aria-current] {
  color: var(--text-dim);
}

.page-about .about-hero__split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
  align-items: end;
}

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

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 7.4vw, 68px);
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--foam);
}
.page-about .about-hero__title em {
  font-style: normal;
  color: var(--neon);
  position: relative;
  display: inline-block;
}
.page-about .about-hero__title em::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: .06em;
  height: .14em;
  background: linear-gradient(90deg, var(--orange) 0%, var(--neon) 55%, var(--cyan) 100%);
  opacity: .85;
}

.page-about .about-hero__lede {
  margin-top: 20px;
  max-width: 60ch;
  color: var(--text-dim);
  font-size: 16px;
  line-height: 1.65;
}

.page-about .about-hero__dock {
  position: relative;
  padding: 22px 20px 18px;
  background: rgba(11, 18, 32, .55);
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 22px 100%, 0 calc(100% - 22px));
  backdrop-filter: blur(2px);
}
.page-about .about-hero__dock-label {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-dock-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px 12px;
}
.page-about .about-dock-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-left: 10px;
  border-left: 2px solid var(--orange);
}
.page-about .about-dock-num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 26px;
  line-height: 1;
  color: var(--neon);
}
.page-about .about-dock-unit {
  font-size: 13px;
  margin-left: 2px;
  color: var(--orange-soft);
}
.page-about .about-dock-key {
  font-size: 12px;
  color: var(--text-dim-2);
}
.page-about .about-hero__dock-foot {
  margin: 16px 0 0;
  font-size: 12px;
  color: var(--text-dim-2);
  border-top: 1px dashed var(--about-line-soft);
  padding-top: 10px;
}

/* ============ 主体布局 ============ */
.page-about .about-body {
  padding: 0 0 64px;
}

.page-about .about-body__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

/* 目录轴 —— 移动端为横向滚动条 */
.page-about .about-rail {
  position: sticky;
  top: var(--header-h);
  z-index: 3;
  padding: 12px 0;
  background: linear-gradient(180deg, var(--sea-900) 0%, rgba(7, 26, 56, .92) 100%);
  border-bottom: 1px solid var(--about-line);
}
.page-about .about-rail__title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--text-dim-2);
}
.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.page-about .about-rail__list::-webkit-scrollbar { display: none; }

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  white-space: nowrap;
  text-decoration: none;
  font-size: 13px;
  color: var(--text-dim);
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}
.page-about .about-rail__idx {
  font-family: var(--font-num);
  font-size: 11px;
  color: var(--orange);
}
.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--foam);
  border-color: var(--cyan);
  background: rgba(40, 224, 224, .1);
}

.page-about .about-flow {
  min-width: 0;
  padding-top: 34px;
}

/* ============ 区块通用 ============ */
.page-about .about-sec {
  position: relative;
  padding: 44px 0;
  border-top: 1px solid var(--about-line-soft);
  scroll-margin-top: calc(var(--header-h) + 64px);
}
.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-sec__head .section-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 5vw, 46px);
  line-height: 1.12;
  letter-spacing: -.015em;
  color: var(--foam);
  margin: 10px 0 0;
}
.page-about .about-sec__head .lede {
  margin-top: 16px;
  max-width: 66ch;
  color: var(--text-dim);
  font-size: 16px;
  line-height: 1.7;
}
.page-about .about-sec__head .eyebrow {
  color: var(--orange-soft);
}

.page-about .about-note {
  margin: 26px 0 0;
  padding: 14px 16px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-dim);
  background: rgba(18, 48, 92, .38);
  border-left: 3px solid var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}
.page-about .about-note--tight {
  margin-top: 22px;
}

/* ============ 01 日常运转 ============ */
.page-about .about-routine {
  margin-top: 30px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.page-about .about-routine__card {
  position: relative;
  padding: 22px 20px 18px;
  background: linear-gradient(150deg, rgba(18, 48, 92, .6) 0%, rgba(7, 26, 56, .8) 100%);
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
  transition: transform .18s var(--ease), border-color .18s var(--ease);
}
.page-about .about-routine__card:hover {
  transform: translateY(-4px);
  border-color: var(--cyan);
}
.page-about .about-routine__no {
  position: absolute;
  top: 14px;
  right: 16px;
  font-family: var(--font-num);
  font-size: 30px;
  font-weight: 700;
  color: rgba(255, 138, 91, .3);
  line-height: 1;
}
.page-about .about-routine__name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  color: var(--foam);
}
.page-about .about-routine__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--text-dim);
}
.page-about .about-routine__meta {
  margin: 14px 0 0;
  padding-top: 10px;
  border-top: 1px dashed var(--about-line-soft);
  font-size: 12.5px;
  font-family: var(--font-num);
  color: var(--neon);
}

/* ============ 02 阶段 ============ */
.page-about .about-timeline-figure {
  margin: 28px 0 0;
}
.page-about .about-timeline-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 0 100%);
}
.page-about .about-timeline-cap {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--text-dim-2);
}

.page-about .about-timeline {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  position: relative;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--orange) 0%, var(--magenta) 40%, var(--cyan) 100%);
  opacity: .5;
}
.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 26px 34px;
}
.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}
.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 6px;
  width: 16px;
  height: 16px;
  background: var(--sea-900);
  border: 2px solid var(--orange);
  transform: rotate(45deg);
  transition: border-color .18s var(--ease), background-color .18s var(--ease);
}
.page-about .about-timeline__item:hover::before {
  border-color: var(--cyan);
  background: rgba(40, 224, 224, .2);
}
.page-about .about-timeline__year {
  display: inline-block;
  margin-bottom: 8px;
  padding: 3px 10px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--ink);
  background: var(--neon);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 100%, 8px 100%);
}
.page-about .about-timeline__name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  color: var(--foam);
}
.page-about .about-timeline__body p {
  margin: 0 0 8px;
  font-size: 14.5px;
  line-height: 1.68;
  color: var(--text-dim);
  max-width: 68ch;
}
.page-about .about-timeline__gain {
  font-size: 13px !important;
  color: var(--cyan) !important;
  font-family: var(--font-num);
}

/* ============ 03 团队 ============ */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  align-items: start;
}
.page-about .about-roles {
  margin: 26px 0 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
.page-about .about-role {
  padding: 14px 16px;
  background: rgba(18, 48, 92, .34);
  border-left: 3px solid var(--orange);
  transition: border-color .18s var(--ease), background-color .18s var(--ease);
}
.page-about .about-role:hover {
  border-left-color: var(--cyan);
  background: rgba(18, 48, 92, .55);
}
.page-about .about-role__name {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 800;
  color: var(--neon);
  margin-bottom: 4px;
}
.page-about .about-role__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.62;
  color: var(--text-dim);
}

.page-about .about-team__figure {
  margin: 0;
}
.page-about .about-team__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}
.page-about .about-team__cap {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--text-dim-2);
}

/* ============ 04 合作与审核 ============ */
.page-about .about-sec--bridge {
  margin: 0 -20px;
  padding: 44px 20px;
  background:
    radial-gradient(80% 100% at 100% 0%, rgba(255, 61, 139, .14) 0%, rgba(255, 61, 139, 0) 60%),
    linear-gradient(150deg, var(--bridge) 0%, var(--sea-800) 100%);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}
.page-about .about-review {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: start;
}
.page-about .about-check-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .about-check-list li {
  position: relative;
  padding: 14px 16px 14px 18px;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--text-dim);
  background: rgba(7, 26, 56, .55);
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}
.page-about .about-check__k {
  display: block;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--orange-soft);
  margin-bottom: 4px;
}
.page-about .about-review__tail {
  margin: 22px 0 0;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--text-dim);
}
.page-about .about-review__cta {
  margin: 18px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .about-review__figure {
  margin: 0;
}
.page-about .about-review__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 24px 100%, 0 calc(100% - 24px));
}
.page-about .about-review__cap {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--text-dim-2);
}

/* ============ 05 数据看板 ============ */
.page-about .about-board {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.page-about .about-board__cell {
  position: relative;
  padding: 18px 14px 16px;
  background: linear-gradient(160deg, rgba(18, 48, 92, .62) 0%, rgba(7, 26, 56, .85) 100%);
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
  transition: transform .18s var(--ease), border-color .18s var(--ease);
}
.page-about .about-board__cell:hover {
  transform: translateY(-4px);
  border-color: var(--cyan);
}
.page-about .about-board__num {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(30px, 8vw, 46px);
  line-height: 1;
  color: var(--neon);
  letter-spacing: -.02em;
}
.page-about .about-board__unit {
  font-size: .42em;
  margin-left: 3px;
  color: var(--orange-soft);
  font-weight: 700;
}
.page-about .about-board__label {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--foam);
}
.page-about .about-board__hint {
  display: block;
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px dashed var(--about-line-soft);
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--text-dim-2);
}

.page-about .about-tail {
  margin-top: 34px;
  padding: 24px 20px;
  background:
    radial-gradient(70% 120% at 0% 0%, rgba(255, 77, 28, .18) 0%, rgba(255, 77, 28, 0) 62%),
    rgba(7, 26, 56, .7);
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 0 100%);
}
.page-about .about-tail__text {
  margin: 0;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.68;
  color: var(--text-dim);
}
.page-about .about-tail__cta {
  margin: 18px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ============ 响应式 ============ */
@media (min-width: 640px) {
  .page-about .about-routine {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-board {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-hero {
    padding: 52px 0 68px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__split {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .95fr);
    gap: 46px;
  }
  .page-about .about-hero__title {
    font-size: clamp(44px, 5.4vw, 72px);
  }
  .page-about .about-body__inner {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 48px;
  }
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    padding: 24px 0 0;
    background: transparent;
    border-bottom: 0;
    border-right: 1px solid var(--about-line-soft);
    align-self: start;
    max-height: calc(100vh - var(--header-h) - 48px);
    overflow-y: auto;
  }
  .page-about .about-rail__list {
    flex-direction: column;
    overflow: visible;
    gap: 6px;
    padding-bottom: 0;
  }
  .page-about .about-rail__link {
    display: flex;
    width: 100%;
    justify-content: flex-start;
    border: 0;
    border-left: 2px solid transparent;
    padding: 9px 12px 9px 14px;
    clip-path: none;
    font-size: 14px;
  }
  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: rgba(40, 224, 224, .08);
    border-left-color: var(--cyan);
  }
  .page-about .about-flow {
    padding-top: 44px;
  }
  .page-about .about-sec {
    padding: 58px 0;
  }
  .page-about .about-routine {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }
  .page-about .about-team {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 40px;
  }
  .page-about .about-review {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
    gap: 40px;
  }
  .page-about .about-board {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }
  .page-about .about-sec--bridge {
    margin: 0;
    padding: 58px 40px;
    clip-path: polygon(0 0, calc(100% - 34px) 0, 100% 34px, 100% 100%, 34px 100%, 0 calc(100% - 34px));
  }
  .page-about .about-timeline::before {
    left: 11px;
  }
  .page-about .about-timeline__item {
    padding-left: 44px;
  }
  .page-about .about-timeline__item::before {
    left: 4px;
  }
}

@media (min-width: 1140px) {
  .page-about .about-body__inner {
    gap: 60px;
  }
  .page-about .about-hero__dock {
    margin-left: auto;
    max-width: 420px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-routine__card,
  .page-about .about-board__cell,
  .page-about .about-role,
  .page-about .about-rail__link,
  .page-about .about-timeline__item::before {
    transition: none;
  }
  .page-about .about-routine__card:hover,
  .page-about .about-board__cell:hover {
    transform: none;
  }
}
</main>