.page-about {
  --about-rail: 78px;
  background: var(--paper);
  color: var(--ink-800);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}

.page-about * {
  box-sizing: border-box;
}

/* ---------- 首屏 ---------- */

.page-about .about-top {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(130% 90% at 90% -10%, rgba(255, 107, 44, 0.18), transparent 62%),
    linear-gradient(180deg, var(--ink-800), var(--ink-900));
  color: var(--on-ink);
  padding-top: clamp(20px, 5vw, 32px);
  padding-bottom: clamp(34px, 7vw, 64px);
}

.page-about .about-hero__scale {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 7px;
  background: repeating-linear-gradient(to right, rgba(255, 107, 44, 0.62) 0 1px, transparent 1px 12px);
  pointer-events: none;
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--on-ink-soft);
}

.page-about .breadcrumb a {
  color: var(--on-ink-soft);
  text-decoration: none;
  border-bottom: 1px dashed transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

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

.page-about .breadcrumb__sep {
  color: rgba(243, 237, 227, 0.32);
}

.page-about .about-hero {
  position: relative;
  margin-top: clamp(18px, 4vw, 30px);
  padding: clamp(24px, 5vw, 44px) clamp(18px, 4vw, 40px);
  border: 1px solid var(--rule-ink);
  border-radius: var(--r);
  background: linear-gradient(180deg, rgba(20, 48, 79, 0.7), rgba(6, 21, 48, 0.42));
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 16px;
  height: 16px;
  border-top: 2px solid var(--signal);
  border-right: 2px solid var(--signal);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: -1px;
  width: 16px;
  height: 16px;
  border-bottom: 2px solid var(--celadon);
  border-left: 2px solid var(--celadon);
}

.page-about .about-hero__kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--celadon);
}

.page-about .about-hero__title {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(36px, 10vw, 62px);
  line-height: 1.02;
  letter-spacing: 0.01em;
  color: var(--on-ink);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--on-ink-soft);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px dashed var(--rule-ink);
}

.page-about .about-hero__fact {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 7px 12px;
  border: 1px solid var(--rule-ink);
  border-radius: var(--r);
  background: rgba(6, 21, 48, 0.55);
  font-size: 13px;
  color: var(--on-ink-soft);
}

.page-about .about-hero__fact b {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 15px;
  color: var(--signal);
}

/* ---------- 主体 ---------- */

.page-about .about-main {
  background: var(--paper);
  padding-bottom: clamp(40px, 8vw, 88px);
}

.page-about .about-sec {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  padding: clamp(32px, 7vw, 62px) 0;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-sec:last-of-type {
  border-bottom: 0;
}

.page-about .about-sec__rail {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .about-sec__num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.22em;
  color: var(--signal-text);
}

.page-about .about-sec__rule {
  flex: 1 1 auto;
  height: 1px;
  background: repeating-linear-gradient(to right, var(--rule) 0 1px, transparent 1px 8px);
}

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

.page-about .about-sec__title {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(24px, 6vw, 38px);
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: var(--ink-800);
}

.page-about .about-sub {
  margin: 34px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(18px, 4.4vw, 22px);
  line-height: 1.35;
  color: var(--ink-700);
}

.page-about .about-p {
  margin: 0 0 16px;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--graphite);
}

.page-about .about-p--tight {
  margin-bottom: 8px;
}

.page-about .about-p--tail {
  margin-top: 20px;
  padding-left: 14px;
  border-left: 3px solid var(--signal-soft);
}

.page-about .text-link {
  color: var(--signal-text);
  text-decoration: none;
  border-bottom: 1px solid rgba(168, 60, 16, 0.4);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .text-link:hover,
.page-about .text-link:focus-visible {
  color: var(--ink-800);
  border-bottom-color: var(--ink-800);
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-figure--wide {
  margin: clamp(6px, 2vw, 14px) 0 clamp(18px, 4vw, 34px);
}

.page-about .about-figure--inline {
  margin: 26px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--rule);
  border-radius: var(--r);
  object-fit: cover;
  background: var(--ink-700);
}

.page-about .about-figure__cap {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--graphite);
}

/* ---------- 时间轴 ---------- */

.page-about .tl {
  position: relative;
  list-style: none;
  margin: 22px 0 0;
  padding: 0 0 0 24px;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: repeating-linear-gradient(to bottom, var(--rule) 0 1px, transparent 1px 7px);
}

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

.page-about .tl__item + .tl__item {
  margin-top: 2px;
  border-top: 1px dashed rgba(199, 207, 216, 0.7);
}

.page-about .tl__node {
  display: block;
}

.page-about .tl__sum {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 13px 0;
  cursor: pointer;
  list-style: none;
  transition: color 0.2s var(--ease);
}

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

.page-about .tl__sum::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 19px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--celadon);
  transition: background-color 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .tl__node[open] > .tl__sum::before {
  background: var(--signal);
  border-color: var(--signal);
}

.page-about .tl__sum::after {
  content: "+";
  margin-left: auto;
  padding-left: 12px;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--signal-text);
}

.page-about .tl__node[open] > .tl__sum::after {
  content: "\2013";
}

.page-about .tl__sum:hover .tl__head,
.page-about .tl__sum:focus-visible .tl__head {
  color: var(--signal-text);
}

.page-about .tl__year {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--celadon-text);
}

.page-about .tl__head {
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink-800);
  transition: color 0.2s var(--ease);
}

.page-about .tl__body {
  padding: 0 0 16px 52px;
  max-width: 60ch;
}

.page-about .tl__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--graphite);
}

/* ---------- 三条线 ---------- */

.page-about .lines {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 22px;
}

.page-about .line {
  display: flex;
  flex-direction: column;
  padding: 20px 18px 22px;
  background: var(--card);
  border: 1px solid var(--rule);
  border-top: 3px solid var(--ink-700);
  border-radius: var(--r);
}

.page-about .line--ship {
  border-top-color: var(--signal);
}

.page-about .line--qc {
  border-top-color: var(--celadon);
}

.page-about .line__key {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--graphite);
}

.page-about .line--ship .line__key {
  color: var(--signal-text);
}

.page-about .line--qc .line__key {
  color: var(--celadon-text);
}

.page-about .line__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.3;
  color: var(--ink-800);
}

.page-about .line__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--graphite);
}

.page-about .line__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 14px 0 0;
  border-top: 1px dashed var(--rule);
  display: grid;
  gap: 7px;
}

.page-about .line__list li {
  position: relative;
  padding-left: 14px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--graphite);
}

.page-about .line__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 5px;
  height: 5px;
  background: var(--rule);
  border-radius: 1px;
}

/* ---------- 流程 ---------- */

.page-about .flow {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
}

.page-about .flow__step {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px dashed var(--rule);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--graphite);
}

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

.page-about .flow__n {
  flex: 0 0 auto;
  min-width: 34px;
  text-align: center;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  line-height: 1.5;
  color: var(--signal-text);
  background: var(--signal-soft);
  border: 1px solid rgba(168, 60, 16, 0.2);
  border-radius: 999px;
}

/* ---------- 数据带 ---------- */

.page-about .about-band {
  position: relative;
  margin: 0 calc(-1 * clamp(18px, 5vw, 28px));
  padding: clamp(40px, 8vw, 78px) clamp(18px, 5vw, 28px);
  background: linear-gradient(180deg, var(--ink-900), var(--ink-800) 72%);
  color: var(--on-ink);
}

.page-about .about-band::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 5px;
  background: repeating-linear-gradient(to right, rgba(255, 107, 44, 0.65) 0 2px, transparent 2px 14px);
}

.page-about .about-band__kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--celadon);
}

.page-about .about-band__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(24px, 6vw, 38px);
  line-height: 1.2;
  color: var(--on-ink);
}

.page-about .about-band__note {
  margin: 0;
  max-width: 60ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--on-ink-soft);
}

.page-about .stats {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  border-top: 1px solid var(--rule-ink);
}

.page-about .stats__row {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 0;
  border-bottom: 1px solid var(--rule-ink);
}

.page-about .stats__label {
  flex: 0 0 auto;
  font-size: 14px;
  color: var(--on-ink-soft);
}

.page-about .stats__lead {
  flex: 1 1 auto;
  min-width: 14px;
  align-self: center;
  height: 1px;
  background: repeating-linear-gradient(to right, var(--rule-ink) 0 1px, transparent 1px 7px);
}

.page-about .stats__val {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: clamp(18px, 4.6vw, 24px);
  font-weight: 500;
  line-height: 1.3;
  color: var(--on-ink);
  text-align: right;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.page-about .stats__val em {
  margin-left: 5px;
  font-style: normal;
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--on-ink-soft);
  white-space: nowrap;
}

/* ---------- 团队 ---------- */

.page-about .crew {
  display: flex;
  align-items: center;
  gap: 18px;
  margin: 0 0 22px;
  padding: 20px 18px;
  background: var(--card);
  border: 1px solid var(--rule);
  border-left: 4px solid var(--signal);
  border-radius: var(--r);
}

.page-about .crew__figure {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 0;
  flex: 0 0 auto;
  color: var(--ink-800);
}

.page-about .crew__num {
  font-family: var(--font-mono);
  font-size: clamp(34px, 9vw, 46px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink-800);
}

.page-about .crew__unit {
  font-size: 15px;
  color: var(--graphite);
}

.page-about .crew__note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--graphite);
  border-left: 1px dashed var(--rule);
  padding-left: 18px;
}

/* ---------- 下一步 ---------- */

.page-about .about-next {
  margin-top: clamp(30px, 6vw, 52px);
  padding: clamp(24px, 5vw, 38px) clamp(18px, 4vw, 32px);
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: var(--r);
}

.page-about .about-next__title {
  margin: 0 0 20px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(20px, 5vw, 26px);
  line-height: 1.3;
  color: var(--ink-800);
}

.page-about .about-next__links {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .next-link {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 56px;
  padding: 12px 16px;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: var(--r);
  color: var(--ink-800);
  text-decoration: none;
  transition: border-color 0.22s var(--ease), transform 0.22s var(--ease), background-color 0.22s var(--ease);
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  border-color: var(--signal);
  background: var(--signal-soft);
}

.page-about .next-link__k {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--signal-text);
}

.page-about .next-link__t {
  font-size: 14.5px;
  line-height: 1.6;
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .lines {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-sec {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-sec__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    position: sticky;
    top: 118px;
    align-self: start;
  }

  .page-about .about-sec__rule {
    flex: 0 0 auto;
    width: 1px;
    height: 60px;
    background: repeating-linear-gradient(to bottom, var(--rule) 0 1px, transparent 1px 8px);
  }

  .page-about .about-sec__num {
    font-size: 14px;
  }

  .page-about .about-band {
    margin-left: calc((100% - 100vw) / 2);
    margin-right: calc((100% - 100vw) / 2);
    padding-left: calc((100vw - min(var(--wrap), 100vw)) / 2 + var(--gutter));
    padding-right: calc((100vw - min(var(--wrap), 100vw)) / 2 + var(--gutter));
  }

  .page-about .tl__body {
    padding-left: 62px;
  }
}

@media (max-width: 599px) {
  .page-about .stats__row {
    flex-wrap: wrap;
    gap: 4px 10px;
  }

  .page-about .stats__label {
    flex: 1 1 100%;
    font-size: 13px;
  }

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

  .page-about .stats__val {
    margin-left: auto;
  }

  .page-about .crew {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .page-about .crew__note {
    border-left: 0;
    padding-left: 0;
    padding-top: 12px;
    border-top: 1px dashed var(--rule);
  }

  .page-about .tl__sum {
    gap: 10px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .next-link,
  .page-about .tl__sum,
  .page-about .tl__sum::before,
  .page-about .tl__head,
  .page-about .text-link {
    transition: none;
  }
}