.page-about {
  --a-line: rgba(110, 106, 143, 0.28);
  --a-line-soft: rgba(110, 106, 143, 0.14);
  --a-panel: rgba(17, 26, 51, 0.72);
  --a-panel-deep: rgba(27, 37, 66, 0.6);
  --a-lime-glow: rgba(198, 255, 61, 0.22);
  padding-bottom: 104px;
}

/* ---------- 面包屑与首屏 ---------- */

.page-about .breadcrumb {
  margin-top: 28px;
  margin-bottom: 8px;
}

.page-about .about-hero {
  padding-block: 4px 64px;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

.page-about .about-hero__copy h1 {
  margin: 14px 0 0;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(36px, 8vw, 62px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--ice);
}

.page-about .about-hero .lede {
  margin-top: 22px;
  max-width: 36ch;
  color: var(--mist);
  font-size: var(--t18);
  line-height: 1.75;
}

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

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

/* ---------- 数字带 ---------- */

.page-about .about-nums {
  border-block: 1px solid var(--a-line);
  padding-block: 30px;
  margin-bottom: 8px;
}

.page-about .about-nums__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 26px 18px;
}

.page-about .about-nums__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 14px;
  border-left: 2px solid var(--a-line-soft);
}

.page-about .about-nums__item .kpi__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 6vw, 44px);
  line-height: 1;
  font-weight: 700;
  color: var(--lime);
  letter-spacing: -0.02em;
}

.page-about .about-nums__item .kpi__label {
  font-size: var(--t13);
  color: var(--mist);
  letter-spacing: 0.04em;
}

/* ---------- 章节索引 ---------- */

.page-about .about-index {
  margin-top: 40px;
  margin-bottom: 8px;
}

.page-about .about-index ol {
  display: flex;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-index a {
  display: inline-block;
  white-space: nowrap;
  padding: 9px 16px;
  border: 1px solid var(--a-line);
  border-radius: var(--pill);
  font-size: var(--t13);
  color: var(--mist);
  text-decoration: none;
  transition: color 200ms ease, border-color 200ms ease, background-color 200ms ease;
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--lime);
  border-color: var(--a-lime-glow);
  background: rgba(198, 255, 61, 0.08);
}

/* ---------- 编辑台的一天 ---------- */

.page-about .about-day {
  margin-top: 56px;
}

.page-about .about-day__band {
  position: relative;
  margin-top: 36px;
  padding: 26px 20px 30px;
  border: 1px solid var(--a-line);
  border-radius: var(--r-lg);
  background:
    radial-gradient(120% 80% at 8% 0%, rgba(79, 209, 255, 0.08), transparent 62%),
    linear-gradient(180deg, var(--a-panel-deep), rgba(10, 16, 32, 0.35));
  overflow: hidden;
}

.page-about .about-day__line {
  display: block;
  width: 100%;
  height: 44px;
  margin-bottom: 14px;
}

.page-about .about-day__line polyline {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: 0.65;
  vector-effect: non-scaling-stroke;
}

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

.page-about .about-day__stop {
  position: relative;
  padding-left: 20px;
  border-left: 1px solid var(--a-line-soft);
}

.page-about .about-day__stop::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 6px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 12px var(--a-lime-glow);
}

.page-about .about-day__time {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--t13);
  color: var(--orange);
  letter-spacing: 0.02em;
}

.page-about .about-day__title {
  margin: 8px 0 8px;
  font-size: var(--t24);
  font-weight: 700;
  color: var(--ice);
  letter-spacing: -0.01em;
}

.page-about .about-day__stop p:last-child {
  margin: 0;
  color: var(--mist);
  font-size: var(--t15);
  line-height: 1.75;
}

/* ---------- 四类角色 ---------- */

.page-about .about-roles {
  margin-top: 72px;
}

.page-about .about-roles__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 34px;
}

.page-about .about-roles__card {
  padding: 26px 24px 24px;
  border: 1px solid var(--a-line);
  border-radius: var(--r-lg);
  background: var(--a-panel);
  transition: border-color 240ms ease, transform 240ms ease, background-color 240ms ease;
}

.page-about .about-roles__card:hover,
.page-about .about-roles__card:focus-within {
  border-color: var(--a-lime-glow);
  background: rgba(27, 37, 66, 0.85);
  transform: translateY(-3px);
}

.page-about .about-roles__card h3 {
  margin: 16px 0 10px;
  font-size: var(--t24);
  font-weight: 700;
  line-height: 1.3;
  color: var(--ice);
  letter-spacing: -0.01em;
}

.page-about .about-roles__card > p {
  margin: 0;
  color: var(--mist);
  font-size: var(--t15);
  line-height: 1.78;
}

.page-about .about-roles__aside {
  margin-top: 18px !important;
  padding-top: 14px;
  border-top: 1px dashed var(--a-line-soft);
  font-family: var(--font-mono);
  font-size: var(--t13) !important;
  color: var(--cyan) !important;
  letter-spacing: 0.02em;
}

/* ---------- 覆盖清单 ---------- */

.page-about .about-coverage {
  margin-top: 72px;
}

.page-about .about-coverage__top {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

.page-about .about-coverage__intro .section__title {
  margin-top: 12px;
  max-width: 18ch;
}

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

.page-about .about-coverage__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
}

.page-about .about-coverage__item {
  display: grid;
  grid-template-columns: auto auto minmax(0, 1fr);
  align-items: baseline;
  gap: 12px;
  padding: 16px 18px;
  border: 1px solid var(--a-line-soft);
  border-left: 2px solid var(--violet);
  border-radius: var(--r-md);
  background: rgba(17, 26, 51, 0.55);
  transition: border-left-color 220ms ease, background-color 220ms ease;
}

.page-about .about-coverage__item:hover {
  border-left-color: var(--lime);
  background: rgba(27, 37, 66, 0.8);
}

.page-about .about-coverage__name {
  font-size: var(--t18);
  font-weight: 700;
  color: var(--ice);
  letter-spacing: -0.01em;
}

.page-about .about-coverage__num {
  font-family: var(--font-mono);
  font-size: var(--t18);
  font-weight: 700;
  color: var(--lime);
}

.page-about .about-coverage__tag {
  font-size: var(--t13);
  color: var(--mist);
  text-align: right;
}

.page-about .about-coverage__foot {
  margin: 22px 0 0;
  font-size: var(--t15);
  color: var(--mist);
  line-height: 1.75;
}

/* ---------- 阵容变动流程 ---------- */

.page-about .about-pipeline {
  margin-top: 72px;
}

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

.page-about .about-pipeline__steps {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  counter-reset: none;
}

.page-about .about-pipeline__step {
  position: relative;
  padding: 22px 0 22px 58px;
  border-bottom: 1px solid var(--a-line-soft);
}

.page-about .about-pipeline__step:last-child {
  border-bottom: 0;
}

.page-about .about-pipeline__step::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 26px;
  bottom: -18px;
  width: 1px;
  background: linear-gradient(180deg, var(--a-lime-glow), transparent);
}

.page-about .about-pipeline__step:last-child::before {
  display: none;
}

.page-about .about-pipeline__idx {
  position: absolute;
  left: 0;
  top: 20px;
  width: 40px;
  font-family: var(--font-mono);
  font-size: var(--t13);
  color: var(--lime);
  letter-spacing: 0.06em;
}

.page-about .about-pipeline__step h3 {
  margin: 0 0 8px;
  font-size: var(--t18);
  font-weight: 700;
  color: var(--ice);
}

.page-about .about-pipeline__step p {
  margin: 0;
  color: var(--mist);
  font-size: var(--t15);
  line-height: 1.75;
  max-width: 52ch;
}

/* ---------- 内容纠错 ---------- */

.page-about .about-fix {
  margin-top: 64px;
}

.page-about .about-fix__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  align-items: start;
  padding: 34px 24px;
  border: 1px solid var(--a-line);
  border-radius: var(--r-lg);
  background:
    radial-gradient(90% 120% at 100% 0%, rgba(255, 122, 47, 0.1), transparent 60%),
    var(--a-panel);
}

.page-about .about-fix__copy .section__title {
  margin-top: 12px;
  max-width: 14ch;
}

.page-about .about-fix__copy p {
  margin: 16px 0 0;
  color: var(--mist);
  font-size: var(--t15);
  line-height: 1.78;
  max-width: 40ch;
}

.page-about .about-fix__copy .btn {
  margin-top: 26px;
}

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

.page-about .about-fix__list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 18px;
  border-radius: var(--r-md);
  background: rgba(10, 16, 32, 0.55);
  border: 1px solid var(--a-line-soft);
}

.page-about .about-fix__list strong {
  font-size: var(--t15);
  color: var(--ice);
  font-weight: 700;
}

.page-about .about-fix__list span {
  font-size: var(--t13);
  color: var(--mist);
  line-height: 1.7;
}

/* ---------- 版本演进 ---------- */

.page-about .about-versions {
  margin-top: 72px;
}

.page-about .about-versions__steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 36px;
}

.page-about .about-versions__item {
  padding: 24px 22px;
  border: 1px solid var(--a-line);
  border-radius: var(--r-lg);
  background: var(--a-panel);
  transition: border-color 240ms ease;
}

.page-about .about-versions__item:hover {
  border-color: var(--a-lime-glow);
}

.page-about .about-versions__ver {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--t13);
  letter-spacing: 0.04em;
  color: var(--orange);
}

.page-about .about-versions__item--3 .about-versions__ver {
  color: var(--lime);
}

.page-about .about-versions__item h3 {
  margin: 12px 0 10px;
  font-size: var(--t24);
  font-weight: 700;
  line-height: 1.3;
  color: var(--ice);
  letter-spacing: -0.01em;
}

.page-about .about-versions__item p {
  margin: 0;
  color: var(--mist);
  font-size: var(--t15);
  line-height: 1.78;
  max-width: 48ch;
}

.page-about .about-versions__cta {
  margin-top: 44px;
  padding-top: 28px;
  border-top: 1px solid var(--a-line-soft);
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .about-versions__cta p {
  margin: 0;
  color: var(--mist);
  font-size: var(--t15);
  line-height: 1.75;
  max-width: 40ch;
}

.page-about .about-versions__cta .cluster {
  gap: 12px;
  flex-wrap: wrap;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .about-roles__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-fix__grid {
    padding: 40px 36px;
  }

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

  .page-about .about-versions__cta {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
  }

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

  .page-about .about-day__stops {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 30px;
  }

  .page-about .about-coverage__top {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 48px;
  }

  .page-about .about-pipeline__steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 20px;
    margin-top: 44px;
  }

  .page-about .about-pipeline__step {
    padding: 46px 18px 22px 0;
    border-bottom: 0;
    border-top: 1px solid var(--a-line-soft);
  }

  .page-about .about-pipeline__step::before {
    left: 0;
    top: 0;
    bottom: auto;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, var(--a-lime-glow), transparent);
  }

  .page-about .about-pipeline__idx {
    top: 16px;
    left: 0;
    width: auto;
  }

  .page-about .about-pipeline__step h3 {
    margin-top: 0;
  }

  .page-about .about-fix__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: 56px;
  }

  .page-about .about-versions__item--2 {
    margin-left: 40px;
  }

  .page-about .about-versions__item--3 {
    margin-left: 80px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-versions__item--2 {
    margin-left: 64px;
  }

  .page-about .about-versions__item--3 {
    margin-left: 128px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-roles__card,
  .page-about .about-versions__item,
  .page-about .about-coverage__item {
    transition: none;
  }

  .page-about .about-roles__card:hover {
    transform: none;
  }
}