.page-about {
  --about-line: 1px solid var(--grid);
  --about-card: linear-gradient(158deg, rgba(31, 111, 99, 0.26), rgba(27, 36, 34, 0.94) 58%);
  --about-warm: linear-gradient(152deg, rgba(255, 138, 61, 0.18), rgba(27, 36, 34, 0.94) 66%);
  display: block;
  color: var(--ice);
  background:
    radial-gradient(900px 520px at 88% -6%, rgba(31, 111, 99, 0.42), transparent 62%),
    radial-gradient(700px 420px at 2% 10%, rgba(255, 138, 61, 0.1), transparent 60%),
    var(--ink);
  overflow-x: clip;
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 5vw, 52px) 0 clamp(46px, 9vw, 108px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -140px;
  top: -120px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle at 42% 42%, rgba(184, 255, 46, 0.16), transparent 68%);
  pointer-events: none;
}

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

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--mist);
}

.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  transition: color 0.25s var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--lime);
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: 18px;
  margin-top: clamp(30px, 6vw, 74px);
}

.page-about .about-hero__note {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  line-height: 1;
  color: var(--mist);
}

.page-about .about-hero__lead h1 {
  margin: 0.4em 0 0;
  font-size: clamp(30px, 7vw, 72px);
  line-height: 1.08;
  font-weight: 900;
  letter-spacing: -0.02em;
  max-width: 20ch;
}

.page-about .about-hero__accent {
  font-style: normal;
  color: var(--lime);
}

.page-about .about-hero__intro {
  margin: 24px 0 0;
  max-width: 44ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: rgba(242, 247, 244, 0.82);
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 42px;
  margin-top: clamp(28px, 5vw, 48px);
}

.page-about .about-hero__stats .stat {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px;
  padding-left: 16px;
  border-left: 2px solid var(--lime);
}

.page-about .about-hero__stats .stat:last-child {
  border-left-color: var(--orange);
}

.page-about .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1;
  color: var(--lime);
}

.page-about .about-hero__stats .stat:last-child .stat__value {
  color: var(--orange);
}

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

.page-about .stat__label {
  width: 100%;
  font-size: 13px;
  color: var(--mist);
}

.page-about .about-body {
  display: grid;
  gap: 30px;
  padding-bottom: clamp(64px, 9vw, 124px);
}

.page-about .about-content {
  min-width: 0;
}

.page-about .about-toc {
  align-self: start;
}

.page-about .toc__title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.page-about .about-toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-toc__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc__list a {
  display: block;
  padding: 8px 14px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-size: 13px;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.28s var(--ease), background 0.28s var(--ease), border-color 0.28s var(--ease);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--lime-soft);
  border-color: rgba(184, 255, 46, 0.35);
}

.page-about .about-toc__list a.is-active,
.page-about .about-toc__list a[aria-current="true"] {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .section {
  margin-top: clamp(56px, 9vw, 116px);
}

.page-about .about-content > .section:first-child {
  margin-top: 0;
}

.page-about .section__eyebrow {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--lime);
}

.page-about .section__title {
  margin: 0.35em 0 0.5em;
  font-size: clamp(25px, 4.4vw, 44px);
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .section__note {
  margin: 0;
  max-width: 48ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

/* 使用者三类 */
.page-about .about-audience__list {
  display: grid;
  gap: 16px;
  margin-top: 28px;
}

.page-about .about-audience__item {
  position: relative;
  padding: 24px 22px 22px;
  border: var(--about-line);
  border-radius: var(--radius-l);
  background: rgba(27, 36, 34, 0.72);
}

.page-about .about-audience__item--a {
  background: linear-gradient(150deg, rgba(31, 111, 99, 0.32), rgba(27, 36, 34, 0.92) 72%);
}

.page-about .about-audience__item--c {
  background: var(--about-warm);
}

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

.page-about .about-audience__item--c .about-audience__index {
  color: var(--orange);
}

.page-about .about-audience__title {
  margin: 10px 0 12px;
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 700;
}

.page-about .about-audience__item p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(242, 247, 244, 0.8);
}

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

.page-about .about-audience__item a,
.page-about .about-schedule__text a,
.page-about .about-promise__text a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px dashed rgba(184, 255, 46, 0.5);
}

.page-about .about-audience__item a:hover,
.page-about .about-schedule__text a:hover,
.page-about .about-promise__text a:hover {
  color: var(--lime-soft);
  border-bottom-color: var(--lime-soft);
}

/* 图片容器 */
.page-about .media-frame {
  position: relative;
  overflow: hidden;
  border: var(--about-line);
  border-radius: var(--radius-l);
  background: var(--panel);
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .media-frame--wide {
  aspect-ratio: 21 / 9;
}

.page-about .media-frame__caption {
  position: absolute;
  left: 14px;
  bottom: 14px;
  max-width: calc(100% - 28px);
  padding: 7px 12px;
  border-radius: var(--radius-pill);
  background: rgba(11, 42, 34, 0.78);
  font-size: 12px;
  line-height: 1.5;
  color: var(--ice);
}

.page-about .about-timeline__figure {
  margin: 28px 0 30px;
}

/* 时间线 */
.page-about .about-timeline__railwrap {
  position: relative;
}

.page-about .about-timeline__curve {
  display: block;
  width: 100%;
  height: 32px;
  opacity: 0.9;
}

.page-about .about-timeline__rail {
  display: flex;
  gap: 12px;
  margin-top: -4px;
  padding: 4px 2px 12px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
}

.page-about .tabs__btn.about-stage__btn {
  flex: 0 0 auto;
  min-width: 152px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: flex-start;
  padding: 16px 18px 18px;
  border: var(--about-line);
  border-radius: var(--radius-m);
  background: var(--panel);
  color: var(--ice);
  text-align: left;
  cursor: pointer;
  scroll-snap-align: start;
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease), background 0.35s var(--ease);
}

.page-about .tabs__btn.about-stage__btn::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 12px rgba(184, 255, 46, 0.6);
}

.page-about .tabs__btn.about-stage__btn:nth-child(even)::before {
  background: var(--orange);
  box-shadow: 0 0 12px rgba(255, 138, 61, 0.55);
}

.page-about .tabs__btn.about-stage__btn[aria-selected="true"] {
  border-color: rgba(184, 255, 46, 0.6);
  background: linear-gradient(160deg, rgba(184, 255, 46, 0.16), rgba(27, 36, 34, 0.92));
  transform: translateY(-4px);
}

.page-about .tabs__btn.about-stage__btn:hover {
  border-color: rgba(232, 255, 122, 0.65);
}

.page-about .about-stage__year {
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--lime);
}

.page-about .tabs__btn.about-stage__btn:nth-child(even) .about-stage__year {
  color: var(--amber);
}

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

.page-about .about-stage__panel {
  display: grid;
  gap: 12px;
  margin-top: 22px;
  padding: clamp(20px, 3.6vw, 34px);
  border: var(--about-line);
  border-radius: var(--radius-l);
  background: var(--about-card);
}

.page-about .about-stage__panel[hidden] {
  display: none;
}

.page-about .about-stage__title {
  margin: 0;
  font-size: clamp(19px, 2.6vw, 26px);
  font-weight: 700;
}

.page-about .about-stage__panel p {
  margin: 0;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(242, 247, 244, 0.82);
}

/* 团队 */
.page-about .about-team__figure,
.page-about .about-coverage__figure {
  aspect-ratio: 3 / 2;
  margin: 28px 0 30px;
}

.page-about .about-team__blocks {
  display: grid;
  gap: 16px;
  margin-top: 26px;
}

.page-about .about-team__block {
  padding: 24px 22px;
  border: var(--about-line);
  border-radius: 26px 14px 30px 16px;
  background: rgba(27, 36, 34, 0.75);
  transition: transform 0.4s var(--ease), border-color 0.4s var(--ease), background 0.4s var(--ease);
}

.page-about .about-team__block:nth-child(2) {
  border-radius: 14px 30px 16px 26px;
}

.page-about .about-team__block:nth-child(3) {
  border-radius: 30px 18px 22px 28px;
}

.page-about .about-team__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-team__title {
  margin: 0;
  font-size: 19px;
  font-weight: 700;
}

.page-about .about-team__count {
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-team__block:nth-child(2) .about-team__count {
  color: var(--amber);
}

.page-about .about-team__block p {
  margin: 12px 0 16px;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(242, 247, 244, 0.8);
}

.page-about .about-team__share {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
  transition: color 0.35s var(--ease);
}

.page-about .meter {
  height: 6px;
  border-radius: var(--radius-pill);
  background: rgba(46, 58, 55, 0.9);
  overflow: hidden;
}

.page-about .meter__fill {
  display: block;
  width: var(--meter-value, 0%);
  height: 100%;
  border-radius: inherit;
  background: var(--lime);
  transition: width 0.6s var(--ease);
}

.page-about .meter__fill--orange {
  background: var(--orange);
}

@media (hover: hover) {
  .page-about .about-team__block:hover {
    transform: translateY(-6px);
    border-color: rgba(184, 255, 46, 0.55);
    background: linear-gradient(160deg, rgba(31, 111, 99, 0.32), rgba(27, 36, 34, 0.94));
  }

  .page-about .about-team__block:hover .about-team__share {
    color: var(--lime);
  }
}

/* 上线节奏 */
.page-about .about-schedule__steps {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-schedule__step {
  position: relative;
  padding: 0 0 30px 30px;
  border-left: 1px solid var(--grid);
}

.page-about .about-schedule__step:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-schedule__step::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(184, 255, 46, 0.12);
}

.page-about .about-schedule__step:nth-child(3)::before {
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 138, 61, 0.14);
}

.page-about .about-schedule__step:nth-child(4)::before {
  background: var(--mist);
  box-shadow: 0 0 0 4px rgba(127, 169, 155, 0.12);
}

.page-about .about-schedule__time {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--lime);
}

.page-about .about-schedule__step:nth-child(3) .about-schedule__time {
  color: var(--orange);
}

.page-about .about-schedule__step:nth-child(4) .about-schedule__time {
  color: var(--mist);
}

.page-about .about-schedule__text {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(242, 247, 244, 0.8);
}

/* 覆盖范围 */
.page-about .about-coverage__grid {
  display: grid;
  gap: 26px;
}

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

.page-about .about-coverage__text {
  margin: 0 0 14px;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(242, 247, 244, 0.8);
}

.page-about .about-coverage__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 16px;
  margin-top: 26px;
  padding-top: 22px;
  border-top: var(--about-line);
}

.page-about .about-coverage__stats .stat {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px;
}

.page-about .about-coverage__stats .stat__value {
  font-size: clamp(22px, 3vw, 30px);
  color: var(--lime-soft);
}

.page-about .about-coverage__stats .stat:nth-child(2) .stat__value {
  color: var(--amber);
}

/* 合作与认可 */
.page-about .about-partners__grid {
  display: grid;
  gap: 16px;
  margin-top: 28px;
}

.page-about .about-partners__card {
  padding: 26px 22px;
  border: var(--about-line);
  border-radius: var(--radius-m);
  background: rgba(27, 36, 34, 0.7);
}

.page-about .about-partners__card--warm {
  background: var(--about-warm);
}

.page-about .about-partners__title {
  margin: 0 0 12px;
  font-size: 18px;
  font-weight: 700;
}

.page-about .about-partners__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(242, 247, 244, 0.8);
}

/* 三项承诺 */
.page-about .about-promise__grid {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

.page-about .about-promise__card {
  padding: 26px 22px;
  border: 1px solid var(--grid);
  border-radius: var(--radius-s);
  background: rgba(16, 20, 19, 0.55);
}

.page-about .about-promise__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1;
  color: var(--lime);
  letter-spacing: 0.06em;
}

.page-about .about-promise__card:nth-child(2) .about-promise__num {
  color: var(--amber);
}

.page-about .about-promise__card:nth-child(3) .about-promise__num {
  color: var(--orange);
}

.page-about .about-promise__title {
  margin: 14px 0 10px;
  font-size: 17px;
  font-weight: 700;
}

.page-about .about-promise__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(242, 247, 244, 0.8);
}

/* 继续浏览 */
.page-about .about-next__grid {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-next__card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px 22px;
  border: var(--about-line);
  border-radius: var(--radius-m);
  background: linear-gradient(155deg, rgba(31, 111, 99, 0.28), rgba(27, 36, 34, 0.92));
  color: var(--ice);
  text-decoration: none;
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  transform: translateY(-4px);
  border-color: rgba(184, 255, 46, 0.5);
}

.page-about .about-next__title {
  font-size: 18px;
  font-weight: 700;
}

.page-about .about-next__text {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(242, 247, 244, 0.78);
}

.page-about .about-next__arrow {
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--lime);
}

@media (min-width: 780px) {
  .page-about .about-team__blocks {
    grid-template-columns: repeat(6, 1fr);
  }

  .page-about .about-team__block:nth-child(1) {
    grid-column: span 3;
  }

  .page-about .about-team__block:nth-child(2) {
    grid-column: span 3;
    margin-top: 46px;
  }

  .page-about .about-team__block:nth-child(3) {
    grid-column: 2 / span 4;
    margin-top: 6px;
  }

  .page-about .about-partners__grid,
  .page-about .about-next__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 820px) {
  .page-about .about-audience__list {
    grid-template-columns: repeat(12, 1fr);
  }

  .page-about .about-audience__item--a {
    grid-column: 1 / span 5;
  }

  .page-about .about-audience__item--b {
    grid-column: 7 / span 6;
    margin-top: 48px;
  }

  .page-about .about-audience__item--c {
    grid-column: 3 / span 8;
    margin-top: 12px;
  }
}

@media (min-width: 900px) {
  .page-about .about-coverage__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: 44px;
    align-items: center;
  }

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

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: 42px minmax(0, 1fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .about-hero__note {
    writing-mode: vertical-rl;
    letter-spacing: 0.26em;
    height: fit-content;
  }

  .page-about .about-timeline__rail {
    overflow: visible;
    padding-bottom: 4px;
  }
}

@media (min-width: 1040px) {
  .page-about .about-body {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 108px;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-about .about-toc__list a {
    white-space: normal;
    border-radius: var(--radius-s);
    border-left: 1px solid var(--grid);
    padding: 9px 10px 9px 14px;
  }

  .page-about .about-toc__list a.is-active,
  .page-about .about-toc__list a[aria-current="true"] {
    border-left-color: var(--lime);
    background: rgba(184, 255, 46, 0.12);
    color: var(--lime);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__block,
  .page-about .about-next__card,
  .page-about .tabs__btn.about-stage__btn,
  .page-about .meter__fill {
    transition: none;
  }

  .page-about .tabs__btn.about-stage__btn[aria-selected="true"],
  .page-about .about-next__card:hover {
    transform: none;
  }
}

.page-about {
  --meter-value: 1rem;
}