.page-about {
  --about-line: rgba(27, 74, 63, 0.72);
  --about-tint: rgba(0, 229, 192, 0.22);
  display: block;
  padding-bottom: clamp(52px, 8vw, 110px);
  overflow-x: clip;
}

.page-about .breadcrumb {
  padding-top: clamp(16px, 2.4vw, 30px);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2.2vw, 24px);
  padding: clamp(24px, 3.8vw, 50px) 0 clamp(30px, 5vw, 68px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 2%;
  right: 0;
  width: min(540px, 74%);
  height: 86%;
  background: linear-gradient(128deg, rgba(18, 51, 43, 0.9) 0%, rgba(5, 16, 14, 0) 76%);
  clip-path: polygon(24% 0, 100% 0, 78% 100%, 0 100%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__kicker,
.page-about .about-hero__title,
.page-about .about-hero__lead,
.page-about .about-hero__facts {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(33px, 8vw, 76px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__title b {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: -0.04em;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 36em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.9;
  color: var(--body);
}

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

.page-about .about-hero__facts li {
  padding-left: 14px;
  margin-right: 26px;
  border-left: 1px solid var(--about-line);
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-hero__facts b {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--cyan-dim);
  margin-right: 6px;
}

/* ---------- 灯柱分隔纹样 ---------- */

.page-about .about-lights {
  color: rgba(0, 229, 192, 0.34);
  margin: clamp(6px, 1.4vw, 16px) 0;
}

.page-about .about-lights svg {
  display: block;
  width: 100%;
  height: clamp(34px, 4.4vw, 60px);
}

/* ---------- 章节骨架 ---------- */

.page-about .chapter {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2.2vw, 28px);
  padding-block: clamp(38px, 6vw, 84px);
  border-top: 1px solid var(--about-line);
}

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

.page-about .chapter__markinner {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.page-about .chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(38px, 9vw, 66px);
  font-weight: 700;
  line-height: 0.86;
  letter-spacing: -0.05em;
  color: var(--cyan);
  opacity: 0.4;
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .chapter:hover .chapter__num,
.page-about .chapter:focus-within .chapter__num {
  opacity: 0.95;
  transform: translateY(-2px);
}

.page-about .chapter__tag {
  display: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.34em;
  color: var(--muted-deep);
  transition: transform var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .chapter:hover .chapter__tag,
.page-about .chapter:focus-within .chapter__tag {
  transform: translateY(7px);
  color: var(--cyan-dim);
}

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

.page-about .chapter__title {
  margin: 0 0 clamp(12px, 1.6vw, 20px);
  max-width: 20em;
  font-family: var(--font-display);
  font-size: clamp(23px, 3.6vw, 38px);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .chapter__text {
  margin: 0 0 1em;
  max-width: 34em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--body);
}

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

.page-about .chapter__text--tail {
  margin-top: clamp(20px, 2.8vw, 32px);
}

.page-about .prose p {
  margin: 0 0 1.1em;
  max-width: 34em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--body);
}

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

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: clamp(20px, 2.8vw, 34px) 0 0;
  border: 1px solid var(--about-line);
  background: var(--panel);
  overflow: hidden;
  box-shadow: var(--shadow-panel);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06);
}

.page-about .about-figure--side {
  margin-top: clamp(20px, 2.8vw, 0px);
}

.page-about .about-figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--about-line);
  font-size: 12px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */

.page-about .timeline {
  list-style: none;
  margin: clamp(20px, 2.8vw, 32px) 0 0;
  padding: 0;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(27, 74, 63, 0.9) 46%, rgba(27, 74, 63, 0.3) 100%);
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 clamp(22px, 3vw, 34px) clamp(30px, 4vw, 46px);
  outline: none;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  background: var(--ink);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .timeline__item:hover::before,
.page-about .timeline__item:focus-visible::before {
  background: var(--cyan);
  box-shadow: 0 0 0 5px var(--about-tint);
  transform: scale(1.1);
}

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

.page-about .timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.4vw, 26px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .timeline__title {
  margin: 4px 0 6px;
  font-size: clamp(16px, 1.9vw, 20px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .timeline__text {
  margin: 0;
  max-width: 32em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--body);
}

.page-about .timeline__more {
  margin: 0;
  max-width: 32em;
  padding-left: 12px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

@media (hover: hover) {
  .page-about .timeline__item:hover .timeline__more,
  .page-about .timeline__item:focus-within .timeline__more {
    max-height: 10em;
    opacity: 1;
  }
}

@media (hover: none) {
  .page-about .timeline__more {
    max-height: none;
    opacity: 1;
  }
}

/* ---------- 团队分工 ---------- */

.page-about .crew-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
  margin-top: clamp(18px, 2.6vw, 28px);
}

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

.page-about .crew__item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  padding: clamp(14px, 2vw, 22px);
  background: var(--panel);
  transition: background var(--dur) var(--ease);
}

.page-about .crew__item:hover {
  background: var(--turf);
}

.page-about .crew__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--cyan);
  padding-top: 3px;
}

.page-about .crew__role {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .crew__desc {
  margin: 0;
  max-width: 32em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--body);
}

/* ---------- 数据流 ---------- */

.page-about .pipeline {
  list-style: none;
  margin: clamp(20px, 2.8vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(12px, 1.8vw, 20px);
}

.page-about .pipeline__step {
  position: relative;
  padding: clamp(16px, 2vw, 22px);
  border: 1px solid var(--about-line);
  border-left: 2px solid var(--cyan);
  background: linear-gradient(160deg, rgba(18, 51, 43, 0.85) 0%, rgba(12, 30, 26, 0.6) 100%);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .pipeline__step:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
}

.page-about .pipeline__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--cyan-dim);
}

.page-about .pipeline__title {
  margin: 8px 0 6px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .pipeline__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--body);
}

/* ---------- 数字面板 ---------- */

.page-about .statboard-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 42px);
  margin-top: clamp(18px, 2.6vw, 30px);
}

.page-about .statboard {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .metric {
  padding: clamp(16px, 2vw, 22px) clamp(14px, 1.8vw, 20px);
  background: var(--panel);
  transition: background var(--dur) var(--ease);
}

.page-about .metric:hover {
  background: var(--turf);
}

.page-about .metric__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.4vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .metric__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .statboard-layout .about-figure {
  margin-top: 0;
}

/* ---------- 结尾行动区 ---------- */

.page-about .about-cta {
  margin-top: clamp(34px, 5vw, 72px);
  padding: clamp(26px, 4vw, 52px) clamp(20px, 3.4vw, 48px);
  border: 1px solid var(--about-line);
  border-top: 2px solid var(--amber);
  background: linear-gradient(150deg, rgba(12, 30, 26, 0.95) 0%, rgba(5, 16, 14, 0.9) 100%);
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 0 0 clamp(18px, 2.4vw, 28px);
  max-width: 34em;
  font-size: clamp(14px, 1.5vw, 16px);
  line-height: 1.85;
  color: var(--body);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .crew__item {
    grid-template-columns: 40px minmax(0, 1fr);
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    grid-template-areas:
      "kicker kicker"
      "title lead"
      "title facts";
    align-content: start;
    column-gap: clamp(28px, 4vw, 68px);
    row-gap: clamp(14px, 1.8vw, 22px);
  }

  .page-about .about-hero__kicker {
    grid-area: kicker;
  }

  .page-about .about-hero__title {
    grid-area: title;
    align-self: start;
  }

  .page-about .about-hero__lead {
    grid-area: lead;
    align-self: end;
  }

  .page-about .about-hero__facts {
    grid-area: facts;
    align-self: start;
  }

  .page-about .chapter {
    grid-template-columns: 150px minmax(0, 1fr);
    column-gap: clamp(30px, 5vw, 76px);
  }

  .page-about .chapter__markinner {
    position: sticky;
    top: clamp(76px, 12vh, 128px);
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
  }

  .page-about .chapter__tag {
    display: block;
    writing-mode: vertical-rl;
    text-orientation: mixed;
  }
}

@media (min-width: 1024px) {
  .page-about .crew-layout {
    grid-template-columns: minmax(0, 1fr) minmax(240px, 0.58fr);
    align-items: start;
  }

  .page-about .crew-layout .about-figure--side {
    margin-top: 0;
  }

  .page-about .statboard-layout {
    grid-template-columns: minmax(0, 1fr) minmax(240px, 0.52fr);
    align-items: start;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero::before,
  .page-about .chapter__num,
  .page-about .chapter__tag,
  .page-about .timeline__item::before,
  .page-about .timeline__more,
  .page-about .pipeline__step,
  .page-about .crew__item,
  .page-about .metric {
    transition-duration: 0.01ms;
  }
}