.page-about {
  position: relative;
  display: block;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about .about-crumbs {
  padding-top: var(--sp-4);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: var(--sp-4) 0 var(--sp-5);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -18%;
  width: 62%;
  height: 180%;
  background: radial-gradient(58% 58% at 68% 42%, rgba(53, 242, 214, 0.16), rgba(10, 26, 42, 0) 72%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 28%;
  height: 5px;
  background: var(--orange);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-5);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.04;
  font-size: clamp(38px, 6.6vw, 76px);
  margin: 14px 0 20px;
}

.page-about .about-hero__lead {
  max-width: 60ch;
  margin: 0 0 var(--sp-4);
  font-size: 17px;
  line-height: 1.8;
  color: #C7D1DA;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-hero__panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  align-self: end;
}

.page-about .about-stat {
  background: var(--ink);
  padding: 20px 18px;
}

.page-about .about-stat__num {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0 0 6px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-stat__num .num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(30px, 4.6vw, 50px);
  line-height: 1;
  letter-spacing: -0.01em;
}

.page-about .about-stat__unit {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--stone);
}

.page-about .about-stat__label {
  margin: 0;
  font-size: 13px;
  line-height: 1.55;
  color: var(--stone);
}

/* ---------- 页内索引 ---------- */
.page-about .about-jump {
  background: var(--ink-deep);
  border-bottom: 1px solid var(--line);
}

.page-about .about-jump__list {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-jump__item {
  flex: 1 1 130px;
  min-width: 0;
}

.page-about .about-jump__link {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 15px 18px;
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--stone);
  text-decoration: none;
  border-right: 1px solid var(--line);
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.page-about .about-jump__link:hover,
.page-about .about-jump__link:focus-visible {
  color: var(--paper);
  background: rgba(53, 242, 214, 0.07);
  border-bottom-color: var(--cyan);
}

.page-about .about-jump__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--clay);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  border-top: 1px solid var(--line);
}

.page-about .about-section__head {
  max-width: 720px;
  margin-bottom: var(--sp-4);
}

.page-about .about-section__title {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.12;
  font-size: clamp(28px, 4vw, 44px);
  margin: 10px 0 16px;
}

.page-about .about-section__desc {
  margin: 0;
  max-width: 62ch;
  color: #C7D1DA;
}

.page-about .about-figure {
  margin: 0 0 var(--sp-5);
}

.page-about .figure__caption {
  color: var(--stone);
  font-size: 13px;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: var(--line);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 var(--sp-4) 60px;
}

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

.page-about .about-timeline__dot {
  position: absolute;
  left: 0;
  top: 4px;
  width: 31px;
  height: 31px;
  display: grid;
  place-items: center;
  background: var(--ink);
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--stone);
  transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

.page-about .about-timeline__item:hover .about-timeline__dot,
.page-about .about-timeline__item:focus-within .about-timeline__dot {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-deep);
}

.page-about .about-timeline__stage {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .about-timeline__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 21px;
  line-height: 1.32;
  margin: 0 0 8px;
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 64ch;
  font-size: 16px;
  color: #C7D1DA;
}

.page-about .about-timeline__card {
  margin-top: 12px;
  padding: 12px 16px;
  max-width: 64ch;
  background: rgba(5, 13, 23, 0.62);
  border: 1px solid var(--line);
  border-left: 3px solid var(--clay);
  font-size: 15px;
  color: #C7D1DA;
  transition: border-color 0.25s ease, background 0.25s ease, color 0.25s ease;
}

.page-about .about-timeline__item:hover .about-timeline__card {
  border-left-color: var(--cyan);
  background: rgba(53, 242, 214, 0.06);
  color: var(--paper);
}

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

/* ---------- 使用者 ---------- */
.page-about .about-users {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-user {
  background: var(--ink);
  padding: 24px 20px;
  transition: background 0.25s ease;
}

.page-about .about-user:hover {
  background: #0D2033;
}

.page-about .about-user__tag {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .about-user__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.4;
  margin: 0 0 10px;
}

.page-about .about-user__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: #C7D1DA;
}

/* ---------- 七类索引 ---------- */
.page-about .about-map {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-4);
}

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

.page-about .about-map__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-map__item {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-map__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cyan);
  padding-top: 4px;
}

.page-about .about-map__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: 0.02em;
  margin: 0 0 6px;
}

.page-about .about-map__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: #C7D1DA;
}

/* ---------- 工序 ---------- */
.page-about .about-process__body {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-4);
  align-items: start;
}

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

.page-about .about-steps__item {
  position: relative;
  counter-increment: about-step;
  padding: 0 0 22px 62px;
}

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

.page-about .about-steps__item::before {
  content: "0" counter(about-step);
  position: absolute;
  left: 0;
  top: 2px;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  background: var(--clay);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1;
}

.page-about .about-steps__item:last-child::before {
  background: var(--amber);
  color: var(--ink-deep);
}

.page-about .about-steps__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.4;
  margin: 4px 0 6px;
}

.page-about .about-steps__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: #C7D1DA;
}

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

.page-about .about-band {
  margin-top: var(--sp-5);
  background: var(--ink-deep);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-band__inner {
  display: grid;
  grid-template-columns: 1fr;
}

.page-about .about-band__cell {
  padding: 24px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-band__cell:first-child {
  border-top: 0;
}

.page-about .about-band__num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(40px, 5vw, 62px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-band__cell:nth-child(2) .about-band__num {
  color: var(--orange);
}

.page-about .about-band__cell:nth-child(3) .about-band__num {
  color: var(--amber);
}

.page-about .about-band__label {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--stone);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-team__cell {
  background: var(--ink);
  padding: 26px 22px;
}

.page-about .about-team__num {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 54px;
  line-height: 1;
  color: var(--moss);
}

.page-about .about-team__cell:nth-child(2) .about-team__num {
  color: var(--cyan);
}

.page-about .about-team__cell:nth-child(3) .about-team__num {
  color: var(--clay);
}

.page-about .about-team__role {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: 0.04em;
  margin: 0 0 10px;
}

.page-about .about-team__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: #C7D1DA;
}

.page-about .about-team__note {
  margin: var(--sp-3) 0 0;
  padding-left: 16px;
  border-left: 3px solid var(--amber);
  max-width: 72ch;
  font-size: 15px;
  line-height: 1.72;
  color: #C7D1DA;
}

/* ---------- 更新节奏 ---------- */
.page-about .about-rhythm {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-4);
  align-items: start;
}

.page-about .about-rhythm__list {
  list-style: none;
  margin: var(--sp-3) 0 0;
  padding: 0;
}

.page-about .about-rhythm__list li {
  position: relative;
  padding: 0 0 12px 22px;
  font-size: 15px;
  line-height: 1.72;
  color: #C7D1DA;
}

.page-about .about-rhythm__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 9px;
  height: 9px;
  background: var(--cyan);
}

.page-about .about-rhythm__aside {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-route {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 20px;
  background: var(--ink);
  text-decoration: none;
  transition: background 0.22s ease, padding-left 0.22s ease;
}

.page-about .about-route:hover,
.page-about .about-route:focus-visible {
  background: #0D2033;
  padding-left: 26px;
}

.page-about .about-route__key {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-route__val {
  font-size: 14px;
  color: var(--stone);
}

/* ---------- 联系 ---------- */
.page-about .about-contact {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-contact__col {
  background: var(--ink);
  padding: 22px 20px;
}

.page-about .about-contact__key {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--stone);
}

.page-about .about-contact__val {
  margin: 0;
  font-size: 17px;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.page-about .about-legal {
  list-style: none;
  margin: var(--sp-4) 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-about .about-legal__item {
  font-size: 14px;
  line-height: 1.7;
  color: #C7D1DA;
}

.page-about .about-legal__key {
  display: inline-block;
  min-width: 78px;
  margin-right: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--stone);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-users {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .about-legal {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 720px) {
  .page-about .about-contact {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .about-team {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .about-band__inner {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .about-band__cell {
    padding: 30px 26px;
    border-top: 0;
    border-left: 1px solid var(--line);
  }
  .page-about .about-band__cell:first-child {
    border-left: 0;
    padding-left: 0;
  }
}

@media (min-width: 920px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.35fr 1fr;
    gap: var(--sp-5);
    align-items: end;
  }
  .page-about .about-jump__item {
    flex: 1 1 auto;
  }
  .page-about .about-process__body {
    grid-template-columns: 1.15fr 1fr;
    gap: var(--sp-5);
  }
  .page-about .about-rhythm {
    grid-template-columns: 1.3fr 1fr;
    gap: var(--sp-5);
  }
}

@media (min-width: 1024px) {
  .page-about .about-users {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .about-map {
    grid-template-columns: 380px 1fr;
    gap: var(--sp-5);
    align-items: start;
  }
  .page-about .about-timeline__item {
    padding-left: 78px;
  }
  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__dot,
  .page-about .about-timeline__card,
  .page-about .about-jump__link,
  .page-about .about-user,
  .page-about .about-route {
    transition: none;
  }
}