.page-about {
  --ab-axis: 30px;
  --ab-dot: 15px;
  --ab-tz-a: rgba(111, 231, 196, 0.88);
  --ab-tz-b: rgba(111, 231, 196, 0.5);
  --ab-tz-c: rgba(111, 231, 196, 0.22);
  padding-bottom: 72px;
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 18px 0 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .crumbs__item {
  color: var(--muted);
  text-decoration: none;
}

.page-about .crumbs a.crumbs__item:hover {
  color: var(--cyan);
}

.page-about .crumbs__item[aria-current="page"] {
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--stand);
  border-bottom: 1px solid var(--line);
  padding: 34px 0 46px;
}

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

.page-about .about-hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.24;
  filter: saturate(0.55) contrast(1.1);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(180deg, rgba(12, 33, 25, 0.7) 0%, rgba(6, 20, 15, 0.86) 62%, var(--ink) 100%),
    linear-gradient(96deg, rgba(6, 20, 15, 0.9) 0%, rgba(6, 20, 15, 0.15) 70%);
  pointer-events: none;
}

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

.page-about .about-hero__kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  max-width: 20em;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(30px, 7.2vw, 60px);
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--text);
}

.page-about .about-hero__lead {
  margin: 0 0 28px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 34px;
  margin: 0 0 28px;
  padding: 18px 0;
  list-style: none;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__stats .stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 92px;
}

.page-about .about-hero__stats .stat__value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 34px;
  line-height: 1;
  color: var(--cyan-soft);
}

.page-about .about-hero__stats .stat__label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

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

.page-about .about-hero__note {
  display: none;
}

/* ---------- 通用分栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-aside-card {
  background: var(--raise);
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  padding: 22px 22px 24px;
}

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

.page-about .about-aside-card__links {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .about-aside-card__links a {
  display: block;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  text-decoration: none;
  transition: color var(--t) var(--ease), padding-left var(--t) var(--ease);
}

.page-about .about-aside-card__links li:last-child a {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-aside-card__links a:hover,
.page-about .about-aside-card__links a:focus-visible {
  color: var(--cyan);
  padding-left: 6px;
}

.page-about .about-aside-note {
  margin: 16px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--coral);
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 01 我们在做什么 ---------- */
.page-about .about-what__list {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-what__item {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 14px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-what__item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-what__idx {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  line-height: 1.9;
  color: var(--coral);
}

.page-about .about-what__name {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.4;
  color: var(--text);
}

.page-about .about-what__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 02 团队与时区 ---------- */
.page-about .about-tz {
  margin: 30px 0 34px;
}

.page-about .about-tz__bar {
  display: flex;
  gap: 4px;
  height: 62px;
}

.page-about .about-tz__seg {
  position: relative;
  flex: 1;
  border-radius: var(--r-s);
  outline: none;
  transition: transform var(--t) var(--ease);
}

.page-about .about-tz__seg--a {
  background: linear-gradient(180deg, var(--ab-tz-a), rgba(111, 231, 196, 0.34));
}

.page-about .about-tz__seg--b {
  background: linear-gradient(180deg, var(--ab-tz-b), rgba(111, 231, 196, 0.18));
}

.page-about .about-tz__seg--c {
  background: linear-gradient(180deg, var(--ab-tz-c), rgba(111, 231, 196, 0.08));
}

.page-about .about-tz__seg:hover,
.page-about .about-tz__seg:focus-visible {
  transform: translateY(-4px);
}

.page-about .about-tz__tip {
  position: absolute;
  left: 0;
  bottom: calc(100% + 10px);
  width: max-content;
  max-width: 240px;
  padding: 8px 12px;
  border-radius: var(--r-s);
  background: var(--raise);
  border: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.6;
  color: var(--text);
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity var(--t) var(--ease), transform var(--t) var(--ease), visibility var(--t);
  z-index: 3;
}

.page-about .about-tz__seg:hover .about-tz__tip,
.page-about .about-tz__seg:focus-visible .about-tz__tip {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.page-about .about-tz__legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .about-tz__legend li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-tz__dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  flex: none;
}

.page-about .about-tz__dot--a {
  background: var(--ab-tz-a);
}

.page-about .about-tz__dot--b {
  background: var(--ab-tz-b);
}

.page-about .about-tz__dot--c {
  background: var(--ab-tz-c);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-team__card {
  background: var(--raise);
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  padding: 24px 22px 26px;
}

.page-about .about-team__card .card__index {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-team__card .card__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.35;
  color: var(--text);
}

.page-about .about-team__card .card__body {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-team__card .card__meta {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--dim);
}

/* ---------- 03 复核流程 ---------- */
.page-about .about-check__steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 26px 0 0;
}

.page-about .about-check__step {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--raise);
  border: 1px solid var(--line);
  border-radius: var(--r-m);
}

.page-about .about-check__step-no {
  display: inline-block;
  margin-bottom: 8px;
  padding: 3px 10px;
  border-radius: var(--r-p);
  background: rgba(111, 231, 196, 0.12);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-check__step h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 22px;
  color: var(--text);
}

.page-about .about-check__step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-check__arrow {
  display: block;
  width: 2px;
  height: 26px;
  margin: 0 auto;
  background: linear-gradient(180deg, var(--cyan), rgba(111, 231, 196, 0));
  border-radius: 2px;
}

.page-about .about-check__tail {
  margin: 22px 0 0;
  padding: 14px 16px;
  border-left: 3px solid var(--coral);
  background: rgba(255, 122, 84, 0.06);
  border-radius: 0 var(--r-s) var(--r-s) 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}

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

.page-about .about-split__media .media__caption {
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--muted);
}

/* ---------- 04 版本时间轴 ---------- */
.page-about .vtl {
  position: relative;
  margin: 30px 0 0;
  padding: 0 0 0 var(--ab-axis);
  list-style: none;
}

.page-about .vtl::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 20px;
  left: 9px;
  width: 1px;
  background: linear-gradient(180deg, rgba(111, 231, 196, 0) 0%, var(--cyan) 8%, var(--cyan) 90%, rgba(111, 231, 196, 0) 100%);
}

.page-about .vtl__item {
  position: relative;
  padding-bottom: 26px;
}

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

.page-about .vtl__dot {
  position: absolute;
  top: 8px;
  left: calc(var(--ab-axis) * -1 + 2px);
  width: var(--ab-dot);
  height: var(--ab-dot);
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(111, 231, 196, 0.14);
}

.page-about .vtl__dot--coral {
  background: var(--coral);
  box-shadow: 0 0 0 4px rgba(255, 122, 84, 0.16);
}

.page-about .vtl__card {
  background: var(--raise);
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  padding: 22px 20px 24px;
  transition: border-color var(--t) var(--ease), transform var(--t) var(--ease);
}

.page-about .vtl__card:hover {
  border-color: rgba(111, 231, 196, 0.5);
  transform: translateY(-3px);
}

.page-about .vtl__card--live {
  border-color: rgba(255, 122, 84, 0.42);
  background: linear-gradient(168deg, rgba(255, 122, 84, 0.09), rgba(19, 46, 36, 1) 62%);
}

.page-about .vtl__card .chip {
  display: inline-block;
  margin-bottom: 12px;
  padding: 3px 12px;
  border-radius: var(--r-p);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
}

.page-about .vtl__card .chip--muted {
  background: rgba(111, 231, 196, 0.1);
  color: var(--cyan);
}

.page-about .vtl__card .chip--coral {
  background: rgba(255, 122, 84, 0.16);
  color: var(--coral-soft);
}

.page-about .vtl__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 22px;
  line-height: 1.3;
  color: var(--text);
}

.page-about .vtl__card p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .vtl__meta {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 13px !important;
  line-height: 1.7 !important;
  color: var(--dim) !important;
}

/* ---------- 05 覆盖范围 ---------- */
.page-about .about-cover__head {
  max-width: 34em;
}

.page-about .about-cover__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 28px;
}

.page-about .about-cover__map {
  position: relative;
  border-radius: var(--r-m);
  overflow: hidden;
  border: 1px solid var(--line);
  min-height: 200px;
}

.page-about .about-cover__map img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.5;
}

.page-about .about-cover__glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 26% 34%, rgba(111, 231, 196, 0.28), transparent 58%),
    radial-gradient(circle at 74% 68%, rgba(255, 122, 84, 0.2), transparent 55%);
  pointer-events: none;
}

.page-about .about-cover__body p {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-cover__facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  margin: 0 0 20px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  overflow: hidden;
}

.page-about .about-cover__fact {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
  padding: 14px 16px;
  background: var(--raise);
}

.page-about .about-cover__fact dt {
  flex: none;
  min-width: 84px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-cover__fact dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text);
}

.page-about .about-cover__fact .num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 17px;
  color: var(--coral);
}

.page-about .about-cover__note {
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--cyan);
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 06 合作与纠错 ---------- */
.page-about .about-coop__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 28px;
}

.page-about .about-coop__card {
  border-radius: var(--r-m);
  padding: 24px 22px 26px;
  border: 1px solid var(--line);
}

.page-about .about-coop__card--a {
  background: var(--raise);
}

.page-about .about-coop__card--b {
  background: linear-gradient(160deg, rgba(255, 122, 84, 0.1), rgba(19, 46, 36, 1) 66%);
  border-color: rgba(255, 122, 84, 0.34);
}

.page-about .about-coop__card h3 {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 21px;
  color: var(--text);
}

.page-about .about-coop__card ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .about-coop__card li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-coop__card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .about-coop__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-coop__cta {
  margin-top: 18px !important;
}

.page-about .about-coop__notice {
  margin-top: 20px;
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-coop__notice p {
  margin: 0;
}

/* ---------- 07 长期价值 ---------- */
.page-about .about-why__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-why__item {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 14px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-why__item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-why__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 26px;
  line-height: 1.1;
  color: rgba(111, 231, 196, 0.42);
}

.page-about .about-why__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.35;
  color: var(--text);
}

.page-about .about-why__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-why__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

/* ---------- 大屏 ---------- */
@media (min-width: 760px) {
  .page-about {
    padding-bottom: 96px;
  }

  .page-about .about-hero {
    padding: 56px 0 72px;
  }

  .page-about .about-hero__stats {
    gap: 14px 52px;
  }

  .page-about .about-hero__stats .stat__value {
    font-size: 42px;
  }

  .page-about .about-what__item {
    grid-template-columns: 56px 1fr;
  }

  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .about-check__steps {
    grid-template-columns: 1fr auto 1fr;
    align-items: stretch;
    gap: 16px;
  }

  .page-about .about-check__arrow {
    width: 34px;
    height: 2px;
    margin: 0;
    align-self: center;
    background: linear-gradient(90deg, rgba(111, 231, 196, 0), var(--cyan));
  }

  .page-about .about-cover__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1px;
    background: var(--line);
  }

  .page-about .about-cover__fact {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    background: var(--raise);
  }

  .page-about .about-coop__grid {
    grid-template-columns: 1fr 1fr;
    gap: 22px;
  }

  .page-about .about-why__item {
    grid-template-columns: 68px 1fr;
    padding: 26px 0;
  }

  .page-about .about-why__num {
    font-size: 34px;
  }
}

@media (min-width: 980px) {
  .page-about .about-hero {
    padding: 72px 0 88px;
  }

  .page-about .about-hero__title {
    max-width: 16em;
  }

  .page-about .about-hero__inner {
    padding-right: 60px;
  }

  .page-about .about-hero__note {
    display: block;
    position: absolute;
    top: 96px;
    right: 10px;
    z-index: 3;
    margin: 0;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.34em;
    text-transform: uppercase;
    color: rgba(143, 169, 160, 0.8);
    pointer-events: none;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-split--flip {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

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

  .page-about .about-cover__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 44px;
    align-items: stretch;
  }

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

  /* 时间轴居中交错 */
  .page-about .vtl {
    padding-left: 0;
    margin-top: 44px;
  }

  .page-about .vtl::before {
    left: 50%;
    top: 14px;
    bottom: 40px;
  }

  .page-about .vtl__item {
    width: calc(50% - 46px);
    padding-bottom: 34px;
  }

  .page-about .vtl__item:nth-child(odd) {
    margin-right: auto;
  }

  .page-about .vtl__item:nth-child(even) {
    margin-left: auto;
  }

  .page-about .vtl__dot {
    left: auto;
    top: 10px;
  }

  .page-about .vtl__item:nth-child(odd) .vtl__dot {
    left: calc(100% + 39px);
  }

  .page-about .vtl__item:nth-child(even) .vtl__dot {
    left: -46px;
  }

  .page-about .vtl__card {
    padding: 28px 26px 30px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__inner {
    padding-right: 100px;
  }

  .page-about .about-what__item {
    grid-template-columns: 64px 1fr;
    padding: 26px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tz__seg,
  .page-about .vtl__card,
  .page-about .about-aside-card__links a {
    transition: none;
  }

  .page-about .about-tz__seg:hover,
  .page-about .about-tz__seg:focus-visible,
  .page-about .vtl__card:hover {
    transform: none;
  }
}