.page-about {
  display: block;
  color: var(--gr-text);
  background:
    radial-gradient(115% 55% at 10% -8%, rgba(108, 59, 255, .26), transparent 62%),
    radial-gradient(80% 40% at 96% 4%, rgba(0, 229, 160, .1), transparent 60%),
    var(--gr-ink);
  overflow-x: clip;
}

.page-about a {
  color: var(--gr-violet-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(169, 140, 255, .38);
  transition: color .2s var(--gr-ease), border-color .2s var(--gr-ease);
}

.page-about a:hover,
.page-about a:focus-visible {
  color: var(--gr-green);
  border-bottom-color: var(--gr-green);
}

.page-about .gr-crumbs {
  margin-bottom: 28px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--gr-muted);
}

.page-about .gr-crumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .gr-crumbs__list li + li::before {
  content: "/";
  margin-right: 10px;
  color: var(--gr-line);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 28px 0 44px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(35, 35, 52, .6) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(35, 35, 52, .6) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .85), transparent 78%);
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .85), transparent 78%);
  pointer-events: none;
}

.page-about .about-hero > .gr-shell {
  position: relative;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 18px;
  color: var(--gr-green);
}

.page-about .about-hero__title {
  margin: 0 0 22px;
  max-width: 16em;
  font-family: var(--gr-font-sans);
  font-weight: 200;
  font-size: clamp(40px, 9.2vw, 104px);
  line-height: 1.03;
  letter-spacing: -0.02em;
  color: var(--gr-bright);
}

.page-about .about-hero__lead {
  max-width: 46ch;
  margin: 0 0 34px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--gr-text);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 36px;
  padding: 0;
  list-style: none;
  background: var(--gr-line);
  border: 1px solid var(--gr-line);
  border-radius: var(--gr-r-lg);
  overflow: hidden;
}

.page-about .about-facts__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 18px;
  background: var(--gr-panel);
}

.page-about .about-facts__k {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--gr-muted);
}

.page-about .about-facts__v {
  font-size: 19px;
  font-weight: 500;
  color: var(--gr-bright);
}

.page-about .about-facts__note {
  font-size: 12px;
  color: var(--gr-index, var(--gr-muted));
}

.page-about .about-hero__media {
  border-radius: var(--gr-r-xl);
  border: 1px solid var(--gr-line);
}

/* ---------- 通用章节 ---------- */

.page-about .about-section {
  position: relative;
  padding: 52px 0;
}

.page-about .about-section__head {
  margin-bottom: 34px;
}

.page-about .about-section__title {
  margin: 0 0 14px;
  font-family: var(--gr-font-sans);
  font-weight: 500;
  font-size: clamp(26px, 5vw, 42px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--gr-bright);
}

.page-about .about-section__lead {
  max-width: 60ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--gr-text);
}

/* ---------- 版本时间线 ---------- */

.page-about .about-timeline {
  --mk: 46px;
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: var(--mk) minmax(0, 1fr);
  gap: 14px;
  padding-bottom: 24px;
}

.page-about .about-timeline__item:not(:last-child)::after {
  content: "";
  position: absolute;
  left: calc(var(--mk) / 2 - 0.5px);
  top: calc(var(--mk) + 10px);
  bottom: 4px;
  width: 1px;
  background: linear-gradient(to bottom, var(--gr-line), rgba(35, 35, 52, .15));
}

.page-about .about-timeline__marker {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--mk);
  height: var(--mk);
  border-radius: var(--gr-r-md);
  background: var(--gr-panel);
  border: 1px solid var(--gr-line);
  color: var(--gr-muted);
  font-size: 13px;
  letter-spacing: .06em;
}

.page-about .about-timeline__marker--current {
  background: linear-gradient(140deg, var(--gr-violet), var(--gr-violet-deep));
  border-color: rgba(0, 229, 160, .6);
  color: var(--gr-bright);
}

.page-about .about-version {
  border: 1px solid var(--gr-line);
  border-radius: var(--gr-r-lg);
  background: var(--gr-panel);
  overflow: hidden;
  transition: border-color .24s var(--gr-ease), transform .24s var(--gr-ease);
}

.page-about .about-version:hover {
  border-color: rgba(169, 140, 255, .5);
}

.page-about .about-version--current {
  box-shadow: inset 3px 0 0 var(--gr-green);
  border-color: rgba(0, 229, 160, .32);
}

.page-about .about-version__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 6px 14px;
  padding: 18px 18px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-version__head::-webkit-details-marker {
  display: none;
}

.page-about .about-version__head:focus-visible {
  outline: 2px solid var(--gr-green);
  outline-offset: -2px;
}

.page-about .about-version__tag {
  grid-column: 1;
  grid-row: 1;
  color: var(--gr-muted);
}

.page-about .about-version__title {
  grid-column: 1;
  grid-row: 2;
  margin: 0;
  font-size: 18px;
  font-weight: 500;
  line-height: 1.4;
  color: var(--gr-bright);
}

.page-about .about-version__toggle {
  grid-column: 2;
  grid-row: 1 / span 2;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: var(--gr-r-pill);
  border: 1px solid var(--gr-line);
  color: var(--gr-violet-soft);
  font-family: var(--gr-font-mono);
  font-size: 16px;
  line-height: 1;
}

.page-about .about-version__toggle::before {
  content: "+";
}

.page-about .about-version[open] .about-version__toggle::before {
  content: "−";
}

.page-about .about-version[open] .about-version__toggle {
  border-color: rgba(0, 229, 160, .5);
  color: var(--gr-green);
}

.page-about .about-version__body {
  padding: 0 18px 20px;
  border-top: 1px solid var(--gr-line);
  margin-top: -2px;
}

.page-about .about-version__body p {
  margin: 16px 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--gr-text);
}

.page-about .about-version__points {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .about-version__points li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--gr-muted);
}

.page-about .about-version__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 6px;
  height: 6px;
  border-radius: var(--gr-r-pill);
  background: var(--gr-green-deep);
}

.page-about .about-timeline__foot {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--gr-muted);
}

/* ---------- 资料范围 ---------- */

.page-about .about-range__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-range__media {
  border-radius: var(--gr-r-xl);
  border: 1px solid var(--gr-line);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 18px 0 0;
}

.page-about .about-stat {
  padding: 14px 12px;
  border-radius: var(--gr-r-md);
  background: rgba(20, 20, 31, .8);
  border: 1px solid var(--gr-line);
}

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

.page-about .about-stat__value {
  margin: 6px 0 0;
  font-size: clamp(26px, 6vw, 38px);
  font-weight: 500;
  line-height: 1;
  color: var(--gr-green);
}

.page-about .about-range__fields-title {
  margin: 0 0 16px;
  font-size: 17px;
  font-weight: 500;
  color: var(--gr-bright);
}

.page-about .about-fields .gr-tabs__list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  margin-bottom: 18px;
  scrollbar-width: none;
}

.page-about .about-fields .gr-tabs__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-fields .gr-tabs__tab {
  flex: 0 0 auto;
  padding: 9px 16px;
  border-radius: var(--gr-r-pill);
  border: 1px solid var(--gr-line);
  background: transparent;
  color: var(--gr-muted);
  font-family: var(--gr-font-sans);
  font-size: 14px;
  cursor: pointer;
  transition: color .2s var(--gr-ease), border-color .2s var(--gr-ease), background-color .2s var(--gr-ease);
}

.page-about .about-fields .gr-tabs__tab:hover {
  color: var(--gr-text);
  border-color: rgba(169, 140, 255, .45);
}

.page-about .about-fields .gr-tabs__tab[aria-selected="true"] {
  color: var(--gr-bright);
  background: linear-gradient(140deg, var(--gr-violet), var(--gr-violet-deep));
  border-color: transparent;
}

.page-about .about-fields .gr-tabs__tab:focus-visible {
  outline: 2px solid var(--gr-green);
  outline-offset: 2px;
}

.page-about .about-fields .gr-tabs__panel {
  padding: 20px;
  border-radius: var(--gr-r-lg);
  background: var(--gr-panel);
  border: 1px solid var(--gr-line);
}

.page-about .about-fields .gr-tabs__panel[hidden] {
  display: none;
}

.page-about .about-fields .gr-tabs__panel p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--gr-text);
}

.page-about .about-field-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .about-field-list li {
  padding: 9px 13px;
  border-radius: var(--gr-r-md);
  background: rgba(11, 11, 16, .6);
  border: 1px solid var(--gr-line);
  font-size: 13px;
  line-height: 1.6;
  color: var(--gr-muted);
}

/* ---------- 更新节拍 ---------- */

.page-about .about-cadence {
  display: grid;
  gap: 16px;
}

.page-about .about-cadence__card {
  position: relative;
  padding: 24px 22px 26px;
  border-radius: var(--gr-r-xl);
  background: var(--gr-panel);
  border: 1px solid var(--gr-line);
  overflow: hidden;
}

.page-about .about-cadence__card::after {
  content: "";
  position: absolute;
  inset: auto -30% -60% auto;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(108, 59, 255, .38), transparent 68%);
  pointer-events: none;
}

.page-about .about-cadence__card--green::after {
  background: radial-gradient(circle, rgba(0, 229, 160, .26), transparent 68%);
}

.page-about .about-cadence__tag {
  margin: 0 0 12px;
  color: var(--gr-muted);
}

.page-about .about-cadence__num {
  margin: 0 0 10px;
  font-size: clamp(48px, 12vw, 84px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--gr-bright);
}

.page-about .about-cadence__card--green .about-cadence__num {
  color: var(--gr-green);
}

.page-about .about-cadence__unit {
  margin-left: 8px;
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--gr-muted);
}

.page-about .about-cadence__title {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 500;
  color: var(--gr-bright);
}

.page-about .about-cadence__text {
  position: relative;
  max-width: 44ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--gr-text);
}

.page-about .about-rule {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 26px;
  padding: 0 4px;
  border-top: 1px solid var(--gr-line);
}

.page-about .about-rule__tick {
  width: 1px;
  height: 12px;
  margin-top: -6px;
  background: var(--gr-line);
}

.page-about .about-rule__tick--hot {
  height: 20px;
  width: 2px;
  margin-top: -10px;
  background: var(--gr-green);
}

/* ---------- 团队分工 ---------- */

.page-about .about-team__media {
  border-radius: var(--gr-r-xl);
  border: 1px solid var(--gr-line);
  margin-bottom: 26px;
}

.page-about .about-team__grid {
  display: grid;
  gap: 16px;
}

.page-about .about-role {
  padding: 22px 20px;
  border-radius: var(--gr-r-xl);
  background: rgba(20, 20, 31, .78);
  border: 1px solid var(--gr-line);
  transition: transform .24s var(--gr-ease), border-color .24s var(--gr-ease), box-shadow .24s var(--gr-ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within,
.page-about .about-role:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(169, 140, 255, .45);
  box-shadow: var(--gr-shadow-lift);
  outline: none;
}

.page-about .about-role__tag {
  margin: 0 0 12px;
  color: var(--gr-violet-soft);
}

.page-about .about-role__count {
  margin: 0 0 6px;
  font-size: 46px;
  font-weight: 500;
  line-height: 1;
  color: var(--gr-bright);
}

.page-about .about-role__count span {
  margin-left: 6px;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--gr-muted);
}

.page-about .about-role__name {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 500;
  color: var(--gr-green);
}

.page-about .about-role__sum {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--gr-text);
}

.page-about .about-role__tasks {
  margin: 14px 0 0;
  padding: 14px 0 0;
  list-style: none;
  display: grid;
  gap: 7px;
  border-top: 1px solid var(--gr-line);
}

.page-about .about-role__tasks li {
  position: relative;
  padding-left: 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--gr-muted);
}

.page-about .about-role__tasks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 6px;
  height: 6px;
  border-radius: var(--gr-r-pill);
  background: var(--gr-violet-soft);
}

/* ---------- 反馈 ---------- */

.page-about .about-feedback__inner {
  padding: 28px 22px 30px;
  border-radius: var(--gr-r-xl);
  border: 1px solid var(--gr-line);
  background:
    linear-gradient(160deg, rgba(108, 59, 255, .16), transparent 58%),
    var(--gr-panel);
}

.page-about .about-feedback__intro {
  margin-bottom: 24px;
}

.page-about .about-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 16px;
  border-radius: var(--gr-r-lg);
  background: rgba(11, 11, 16, .62);
  border: 1px solid var(--gr-line);
}

.page-about .about-steps__no {
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--gr-green);
}

.page-about .about-steps__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 500;
  color: var(--gr-bright);
}

.page-about .about-steps__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--gr-text);
}

.page-about .about-feedback__mail {
  color: var(--gr-violet-soft);
  word-break: break-all;
}

.page-about .about-feedback__tail {
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--gr-muted);
}

/* ---------- 站点信息 ---------- */

.page-about .about-site__inner {
  display: grid;
  gap: 22px;
  padding: 26px 22px;
  border-radius: var(--gr-r-xl);
  border: 1px solid var(--gr-line);
  background: rgba(20, 20, 31, .7);
}

.page-about .about-site__title {
  margin: 0 0 12px;
  font-size: 22px;
  font-weight: 500;
  color: var(--gr-bright);
}

.page-about .about-site__text {
  max-width: 58ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--gr-text);
}

.page-about .about-site__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-site__actions .gr-btn {
  border-bottom: none;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 40px 0 60px;
  }

  .page-about .about-hero__lead {
    font-size: 17px;
  }

  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-timeline {
    --mk: 54px;
  }

  .page-about .about-timeline__item {
    gap: 20px;
    padding-bottom: 28px;
  }

  .page-about .about-version__head {
    padding: 22px 24px 18px;
  }

  .page-about .about-version__title {
    font-size: 20px;
  }

  .page-about .about-version__body {
    padding: 0 24px 22px;
  }

  .page-about .about-cadence {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-role--wide {
    grid-column: 1 / -1;
  }

  .page-about .about-feedback__inner {
    padding: 36px 32px 38px;
  }

  .page-about .about-site__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 32px 30px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-section {
    padding: 76px 0;
  }

  .page-about .about-section__head {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: 40px;
    align-items: end;
    margin-bottom: 44px;
  }

  .page-about .about-section__title {
    margin-bottom: 0;
  }

  .page-about .about-timeline {
    --mk: 60px;
  }

  .page-about .about-timeline__item {
    gap: 28px;
    padding-bottom: 34px;
  }

  .page-about .about-version__head {
    padding: 26px 30px 20px;
    gap: 8px 20px;
  }

  .page-about .about-version__title {
    font-size: 22px;
  }

  .page-about .about-version__body {
    padding: 0 30px 26px;
  }

  .page-about .about-version__body p {
    font-size: 16px;
  }

  .page-about .about-range__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-cadence__card {
    padding: 30px 28px 32px;
  }

  .page-about .about-team__media {
    margin-bottom: 32px;
  }

  .page-about .about-team__grid {
    grid-template-columns: 1.15fr 1fr 1fr;
    gap: 20px;
  }

  .page-about .about-role--wide {
    grid-column: auto;
  }

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

  .page-about .about-feedback__inner {
    display: grid;
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.6fr);
    gap: 44px;
    align-items: start;
    padding: 44px 40px 46px;
  }

  .page-about .about-feedback__intro {
    margin-bottom: 0;
  }

  .page-about .about-feedback__tail {
    grid-column: 2;
    margin-top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-version,
  .page-about .about-role,
  .page-about .about-fields .gr-tabs__tab,
  .page-about a {
    transition-duration: .01ms;
  }

  .page-about .about-role:hover,
  .page-about .about-role:focus-within,
  .page-about .about-role:focus-visible {
    transform: none;
  }
}

.page-about {
  --gr-index: var(--gr-ink);
}