.page-about {
  --about-block-gap: 40px;
}

.page-about .breadcrumbs {
  padding-top: 24px;
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 36px 0 40px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 70%;
  height: 100%;
  background:
    linear-gradient(140deg, rgba(53, 232, 218, 0.09), rgba(240, 176, 60, 0.05) 40%, transparent 72%);
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__kicker {
  position: relative;
  margin: 0 0 14px;
  font-size: var(--fs-xs);
  letter-spacing: 0.18em;
  color: var(--neon);
}

.page-about .about-hero__title {
  position: relative;
  margin: 0;
  max-width: 20ch;
  font-size: clamp(28px, 8vw, 54px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  position: relative;
  margin: 20px 0 0;
  max-width: 60ch;
  font-size: var(--fs-base);
  line-height: 1.85;
  color: var(--paper-soft);
}

.page-about .about-stats {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 16px;
  margin: 32px 0 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-stats .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .about-stats .stat__num {
  font-family: var(--font-mono);
  font-size: var(--fs-md);
  font-weight: 500;
  color: var(--gold);
  letter-spacing: 0.01em;
}

.page-about .about-stats .stat__label {
  font-size: var(--fs-xs);
  line-height: 1.6;
  color: var(--paper-dim);
}

/* 主体两栏 */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  padding-bottom: 72px;
}

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

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

/* 章节 */
.page-about .about-section {
  padding-top: var(--about-block-gap);
  scroll-margin-top: 88px;
}

.page-about .about-body > .about-section:first-child {
  padding-top: 40px;
}

.page-about .about-section__kicker {
  margin: 0 0 8px;
  font-size: var(--fs-2xs);
  letter-spacing: 0.18em;
  color: var(--clay);
}

.page-about .about-section__title {
  margin: 0;
  padding-left: 14px;
  border-left: 3px solid var(--gold);
  font-size: clamp(21px, 5vw, 30px);
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-section__lead {
  margin: 22px 0 0;
  max-width: 44ch;
  font-size: var(--fs-base);
  font-weight: 500;
  line-height: 1.8;
  color: var(--paper);
}

.page-about .about-section__body p {
  margin: 16px 0 0;
  max-width: 64ch;
  font-size: var(--fs-sm);
  line-height: 1.9;
  color: var(--paper-soft);
}

.page-about .about-inline-links {
  max-width: 64ch;
  margin: 20px 0 0;
  font-size: var(--fs-sm);
  line-height: 1.9;
  color: var(--paper-dim);
}

.page-about .about-inline-links a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 232, 218, 0.4);
  padding-bottom: 1px;
}

.page-about .about-inline-links a:hover,
.page-about .about-inline-links a:focus-visible {
  border-bottom-color: var(--neon);
}

/* 图文分栏 */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  align-items: start;
  margin-top: 24px;
}

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

.page-about .about-split--rev {
  margin-top: 28px;
}

/* 团队分工 */
.page-about .about-crew {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-crew__item {
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.page-about .about-crew__name {
  margin: 0;
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-crew__desc {
  margin: 6px 0 0;
  font-size: var(--fs-xs);
  line-height: 1.75;
  color: var(--paper-soft);
}

/* 校订流程时间轴 */
.page-about .about-flow {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 14px;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .about-flow__step {
  position: relative;
  padding-top: 16px;
  border-top: 2px solid var(--line-strong);
}

.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 8px;
  height: 8px;
  background: var(--gold);
}

.page-about .about-flow__link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.page-about .about-flow__node {
  display: block;
  font-size: var(--fs-xs);
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-flow__name {
  display: block;
  margin-top: 4px;
  font-size: var(--fs-md);
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--paper);
  transition: color 0.2s var(--ease);
}

.page-about .about-flow__link:hover .about-flow__name,
.page-about .about-flow__link:focus-visible .about-flow__name {
  color: var(--neon);
}

.page-about .about-steps {
  margin-top: 28px;
  border-top: 1px solid var(--line);
}

.page-about .about-steps__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
  scroll-margin-top: 96px;
}

.page-about .about-steps__key {
  margin: 0;
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .about-steps__val {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.85;
  color: var(--paper-soft);
}

/* 版本分支 */
.page-about .about-branches {
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 0;
  padding: 0;
}

.page-about .about-branches__item {
  position: relative;
  padding: 16px 16px 16px 20px;
  background: var(--panel);
  border: 1px solid var(--line-soft);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-branches__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 3px;
  background: var(--tone, var(--stone));
}

.page-about .about-branches__item--stone { --tone: var(--stone); }
.page-about .about-branches__item--moss { --tone: var(--moss); }
.page-about .about-branches__item--clay { --tone: var(--clay); }
.page-about .about-branches__item--magenta { --tone: var(--magenta); }

.page-about .about-branches__item:hover {
  border-color: var(--line-strong);
  background: rgba(30, 26, 86, 0.6);
}

.page-about .about-branches__name {
  margin: 0;
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-branches__desc {
  margin: 6px 0 0;
  font-size: var(--fs-xs);
  line-height: 1.75;
  color: var(--paper-soft);
}

/* 通栏图 */
.page-about .about-wide {
  margin: 28px 0 0;
}

/* 节奏数据 */
.page-about .about-cadence {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 28px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-cadence__cell {
  padding: 18px 16px;
  background: var(--panel);
}

.page-about .about-cadence__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-md);
  font-weight: 500;
  color: var(--gold);
}

.page-about .about-cadence__txt {
  margin: 8px 0 0;
  font-size: var(--fs-xs);
  line-height: 1.7;
  color: var(--paper-soft);
}

/* 联系渠道 */
.page-about .about-contact {
  margin-top: 28px;
  padding: 20px 18px;
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--neon);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
}

.page-about .about-contact__title {
  margin: 0 0 14px;
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-contact__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

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

.page-about .about-contact__key {
  font-size: var(--fs-2xs);
  letter-spacing: 0.1em;
  color: var(--stone);
}

.page-about .about-contact__val {
  font-size: var(--fs-sm);
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.page-about .about-contact__note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-size: var(--fs-xs);
  line-height: 1.8;
  color: var(--paper-dim);
}

.page-about .about-contact__note a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 232, 218, 0.4);
}

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

/* 桌面端 */
@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 22px;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 18px;
  }

  .page-about .about-steps__row {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }

  .page-about .about-contact__row {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 14px;
    align-items: baseline;
  }

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

@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 52px 0 48px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 36px;
  }

  .page-about .about-split--rev {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  }

  .page-about .about-branches {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-section {
    padding-top: 56px;
  }
}

@media (min-width: 1040px) {
  .page-about .about-layout {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 64px;
  }

  .page-about .about-index {
    display: block;
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-index__label {
    margin: 0 0 14px;
    font-size: var(--fs-2xs);
    letter-spacing: 0.16em;
    color: var(--stone);
  }

  .page-about .about-index__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 2px;
    border-left: 1px solid var(--line);
  }

  .page-about .about-index__link {
    display: block;
    margin-left: -1px;
    padding: 8px 0 8px 14px;
    border-left: 2px solid transparent;
    font-size: var(--fs-sm);
    line-height: 1.45;
    color: var(--paper-dim);
    text-decoration: none;
    transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    color: var(--neon);
  }

  .page-about .about-index__link.is-active {
    color: var(--neon);
    border-left-color: var(--neon);
    background: linear-gradient(90deg, rgba(53, 232, 218, 0.12), transparent 82%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-branches__item,
  .page-about .about-flow__name,
  .page-about .about-index__link {
    transition: none;
  }
}