.page-about {
  --about-rail: 210px;
  background: var(--ink);
  color: var(--white);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(20px, 3vw, 40px) clamp(40px, 5vw, 72px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
  align-items: start;
  margin-top: clamp(16px, 2.5vw, 28px);
}

.page-about .h1 {
  font-size: clamp(34px, 5.6vw, 72px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 14px 0 0;
  max-width: 22ch;
}

.page-about .about-hero .lede {
  margin-top: clamp(14px, 2vw, 22px);
  max-width: 44ch;
  color: var(--soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 2.6vw, 30px);
}

.page-about .about-hero__stats {
  background: var(--panel);
  border: var(--bw) solid var(--line);
  box-shadow: var(--shadow-hard);
  padding: clamp(18px, 2.4vw, 28px);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 16px;
  margin: 16px 0 0;
}

.page-about .about-figure dt {
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--metal);
}

.page-about .about-figure dd {
  margin: 6px 0 0;
  display: flex;
  align-items: baseline;
  gap: 5px;
}

.page-about .about-figure .stat {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-figure__unit {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--metal);
}

.page-about .about-banner {
  position: relative;
  margin: clamp(28px, 4vw, 52px) 0 0;
  border: var(--bw) solid var(--line);
  overflow: hidden;
  background: var(--panel);
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: clamp(200px, 34vw, 460px);
  object-fit: cover;
  filter: saturate(0.85) contrast(1.05);
}

.page-about .about-banner__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 9px 14px;
  background: rgba(6, 20, 15, 0.88);
  border-top: 1px solid var(--line);
  border-right: 1px solid var(--line);
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--metal);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  align-items: start;
}

.page-about .about-rail__title {
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mute);
  margin: 0 0 10px;
}

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

.page-about .about-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 152px;
  padding: 10px 12px;
  background: var(--panel);
  border: 1px solid var(--line);
  text-decoration: none;
}

.page-about .about-rail__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mute);
}

.page-about .about-rail__label {
  font-size: 13px;
  line-height: 1.4;
  color: var(--metal);
}

.page-about .about-rail__item--now .about-rail__year {
  color: var(--cyan);
}

.page-about .about-rail__item--now .about-rail__label {
  color: var(--white);
}

.page-about .about-rail__link:hover .about-rail__label,
.page-about .about-rail__link:focus-visible .about-rail__label {
  color: var(--white);
}

.page-about .about-phase {
  padding: clamp(22px, 3.2vw, 38px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-phase:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-phase__year {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(34px, 5.2vw, 62px);
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--mute);
}

.page-about .about-phase__year--range {
  font-size: clamp(22px, 3vw, 34px);
  letter-spacing: -0.01em;
}

.page-about .about-phase--now .about-phase__year {
  color: var(--cyan);
}

.page-about .about-phase__body .h3 {
  font-size: clamp(18px, 2.2vw, 24px);
  line-height: 1.25;
  margin: 0 0 10px;
}

.page-about .about-phase__body p {
  margin: 0 0 10px;
  max-width: 42ch;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--soft);
}

.page-about .about-phase__body p:last-child {
  margin-bottom: 0;
}

/* ---------- 内容产出 ---------- */
.page-about .about-produce__grid {
  align-items: center;
}

.page-about .about-produce__text .h2 {
  font-size: clamp(24px, 3.2vw, 42px);
  line-height: 1.1;
  margin: 12px 0 16px;
  max-width: 20ch;
}

.page-about .about-produce__text p {
  margin: 0 0 12px;
  max-width: 42ch;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--soft);
}

.page-about .about-produce__media {
  position: relative;
  border: var(--bw) solid var(--line);
  overflow: hidden;
  background: var(--panel);
  margin: 0;
}

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

.page-about .about-inline-link {
  display: inline-block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 3px;
}

.page-about .about-inline-link:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 三段推进 ---------- */
.page-about .about-nodes {
  margin-top: clamp(36px, 5vw, 64px);
}

.page-about .about-nodes__title {
  font-size: clamp(18px, 2.2vw, 24px);
  margin: 0 0 18px;
}

.page-about .about-nodes__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-node {
  background: var(--panel);
  border: var(--bw) solid var(--line);
  border-top-width: 4px;
  padding: clamp(18px, 2.4vw, 26px);
}

.page-about .about-node--pre {
  border-top-color: var(--cyan);
}

.page-about .about-node--live {
  border-top-color: var(--orange);
}

.page-about .about-node--post {
  border-top-color: var(--metal);
}

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

.page-about .about-node__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: 0.02em;
}

.page-about .about-node__when {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--metal);
}

.page-about .about-node__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-node__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--soft);
}

.page-about .about-node__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  background: var(--line);
}

/* ---------- 数据来源 ---------- */
.page-about .about-data {
  position: relative;
  overflow: hidden;
}

.page-about .about-data__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-data__bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.24;
  filter: saturate(0.9);
}

.page-about .about-data__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(6, 20, 15, 0.96) 0%, rgba(6, 20, 15, 0.7) 52%, rgba(6, 20, 15, 0.95) 100%);
}

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

.page-about .about-data__inner .h2 {
  font-size: clamp(24px, 3.2vw, 42px);
  line-height: 1.1;
  margin: 12px 0 14px;
  max-width: 24ch;
}

.page-about .lede--tight {
  max-width: 46ch;
  color: var(--soft);
}

.page-about .about-data__list {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-data__list li {
  display: flex;
  gap: 14px;
  padding: 16px 18px;
  background: rgba(11, 34, 26, 0.92);
}

.page-about .about-data__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  padding-top: 3px;
  flex: 0 0 auto;
}

.page-about .about-data__txt {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--soft);
}

/* ---------- 主队维度 ---------- */
.page-about .about-shift__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
  align-items: stretch;
}

.page-about .about-shift__text .h2 {
  font-size: clamp(24px, 3.2vw, 42px);
  line-height: 1.1;
  margin: 12px 0 16px;
  max-width: 22ch;
}

.page-about .about-shift__text p {
  margin: 0 0 12px;
  max-width: 44ch;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--soft);
}

.page-about .about-shift__list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-shift__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--metal);
}

.page-about .about-shift__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 2px;
  background: var(--orange);
}

.page-about .about-shift__mark {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 10px;
  padding: clamp(20px, 3vw, 32px);
  background: var(--raise);
  border: var(--bw) solid var(--line);
  box-shadow: var(--shadow-hard);
}

.page-about .about-shift__mark-label {
  margin: 0;
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--metal);
}

.page-about .about-shift__num {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(46px, 7vw, 82px);
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .about-shift__mark-note {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--soft);
}

/* ---------- 访客支持 ---------- */
.page-about .about-support__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 44px);
  align-items: start;
}

.page-about .about-support__text .h2 {
  font-size: clamp(24px, 3.2vw, 42px);
  line-height: 1.1;
  margin: 12px 0 16px;
  max-width: 20ch;
}

.page-about .about-support__text p {
  margin: 0 0 12px;
  max-width: 44ch;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--soft);
}

.page-about .about-contact {
  background: var(--panel);
  border: var(--bw) solid var(--line);
  padding: clamp(18px, 2.6vw, 28px);
}

.page-about .about-contact__label {
  margin: 0 0 14px;
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mute);
}

.page-about .about-contact__list {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-contact__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-contact__row dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--metal);
}

.page-about .about-contact__row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--white);
  word-break: break-word;
}

/* ---------- 下一步 ---------- */
.page-about .about-next .h2 {
  font-size: clamp(24px, 3.2vw, 42px);
  line-height: 1.1;
  margin: 12px 0 0;
  max-width: 20ch;
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(20px, 3vw, 34px);
  background: var(--line);
  border: var(--bw) solid var(--line);
}

.page-about .about-next__card {
  display: block;
  background: var(--panel);
  padding: clamp(18px, 2.4vw, 26px);
  text-decoration: none;
  color: var(--white);
  transition: background 180ms ease, transform 180ms ease;
}

.page-about .about-next__card:hover {
  background: var(--raise);
}

.page-about .about-next__card:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -4px;
}

.page-about .about-next__idx {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-next__title {
  display: block;
  margin-top: 12px;
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: 0.01em;
}

.page-about .about-next__desc {
  display: block;
  margin-top: 9px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--metal);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-nodes__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .about-hero__head {
    grid-column: span 7;
  }

  .page-about .about-hero__stats {
    grid-column: span 5;
  }

  .page-about .about-shift__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
  }

  .page-about .about-support__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
  }

  .page-about .about-contact__row {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 12px;
    align-items: baseline;
  }
}

@media (min-width: 1040px) {
  .page-about .about-timeline {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(32px, 4.5vw, 76px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 148px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0 0 0 20px;
    position: relative;
  }

  .page-about .about-rail__list::before {
    content: "";
    position: absolute;
    left: 5px;
    top: 10px;
    bottom: 10px;
    width: 2px;
    background: var(--line);
  }

  .page-about .about-rail__item {
    position: relative;
  }

  .page-about .about-rail__item::before {
    content: "";
    position: absolute;
    left: -20px;
    top: 20px;
    width: 12px;
    height: 12px;
    background: var(--mute);
    box-shadow: 0 0 0 3px var(--ink);
  }

  .page-about .about-rail__item--now::before {
    background: var(--cyan);
  }

  .page-about .about-rail__link {
    min-width: 0;
    padding: 14px 0;
    background: none;
    border: 0;
  }

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

  .page-about .about-phase {
    display: grid;
    grid-template-columns: minmax(120px, 186px) minmax(0, 1fr);
    gap: clamp(20px, 3vw, 42px);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-next__card {
    transition: none;
  }
}