.page-about {
  background: var(--ink);
  color: var(--paper);
  overflow-x: clip;
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
  padding-block: clamp(18px, 3vw, 32px) clamp(56px, 8vw, 104px);
}

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

/* ---- 侧边品牌轨道 ---- */
.page-about .about-rail {
  min-width: 0;
  border-bottom: 1px solid var(--line);
  padding-bottom: 12px;
}

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

.page-about .about-rail .rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail .rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail .rail__link {
  display: inline-block;
  white-space: nowrap;
  padding: 7px 12px;
  font-size: 13px;
  color: var(--mist);
  text-decoration: none;
  border: 1px solid var(--line);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-rail .rail__link:hover,
.page-about .about-rail .rail__link[aria-current="true"] {
  color: var(--cyan);
  border-color: var(--line-strong);
}

/* ---- 首屏 ---- */
.page-about .breadcrumbs {
  margin-bottom: 16px;
}

.page-about .about-masthead {
  padding-block: clamp(14px, 2.5vw, 24px) clamp(26px, 4vw, 46px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-masthead__title {
  margin: 14px 0 0;
  max-width: 11em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 6.4vw, 84px);
  line-height: 1.02;
  letter-spacing: -0.025em;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .about-masthead__title .hl {
  color: var(--cyan);
  box-shadow: inset 0 -0.16em 0 rgba(0, 240, 200, 0.16);
}

.page-about .about-masthead__lead {
  margin: 22px 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.3vw, 18px);
  line-height: 1.78;
  color: var(--mist);
}

.page-about .mast-meta {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
}

.page-about .mast-meta li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  background: var(--panel);
}

.page-about .mast-meta__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--faint);
}

.page-about .mast-meta__v {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

/* ---- 章节通用 ---- */
.page-about .about-section {
  padding-block: clamp(34px, 5vw, 64px);
  border-top: 1px solid var(--line);
}

.page-about .about-section:first-of-type {
  border-top: none;
  padding-top: clamp(28px, 4vw, 46px);
}

.page-about .about-section__head {
  margin-bottom: clamp(18px, 2.6vw, 30px);
}

.page-about .about-section h2 {
  margin: 10px 0 0;
  max-width: 22em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 3.4vw, 42px);
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .prose {
  color: var(--mist);
}

.page-about .prose p {
  margin: 0 0 16px;
  line-height: 1.78;
}

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

/* ---- 分栏与图 ---- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
}

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

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

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow-paper);
  background: var(--panel);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--faint);
}

/* ---- 六类内容 ---- */
.page-about .about-topics {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-topic {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 14px;
  padding: 15px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-topic__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
  padding-top: 3px;
}

.page-about .about-topic h3 {
  margin: 0 0 5px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-topic p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---- 纸面章节：内容工序 ---- */
.page-about .about-section--paper {
  margin-block: clamp(22px, 4vw, 44px);
  padding-inline: clamp(18px, 3vw, 40px);
  padding-block: clamp(30px, 4vw, 52px);
  background: var(--paper);
  color: var(--char);
  border-top: 1px solid rgba(34, 40, 38, 0.14);
  box-shadow: var(--shadow-paper);
}

.page-about .about-section--paper h2 {
  color: var(--char);
}

.page-about .about-section--paper .eyebrow {
  color: var(--pine);
}

.page-about .about-paper-lead {
  margin: 0 0 clamp(22px, 3vw, 32px);
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(34, 40, 38, 0.76);
}

.page-about .method-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .method-steps li {
  position: relative;
  min-width: 0;
  padding-top: 20px;
  border-top: 2px solid rgba(34, 40, 38, 0.16);
}

.page-about .method-steps li::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--orange);
}

.page-about .method-steps__num {
  display: block;
  margin-bottom: 7px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--pine);
}

.page-about .method-steps h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--char);
}

.page-about .method-steps p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(34, 40, 38, 0.72);
}

.page-about .about-figure--paper {
  margin-top: clamp(24px, 3vw, 34px);
}

.page-about .about-figure--paper img {
  border-color: rgba(34, 40, 38, 0.22);
  box-shadow: 6px 6px 0 rgba(29, 90, 72, 0.16);
}

.page-about .about-figure--paper figcaption {
  color: rgba(34, 40, 38, 0.6);
}

/* ---- 团队 ---- */
.page-about .team-grid {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .team-card {
  min-width: 0;
  padding: 18px 18px 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--pine);
  transition: border-color 0.28s var(--ease), background-color 0.28s var(--ease), transform 0.28s var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  border-left-color: var(--cyan);
  background: rgba(29, 90, 72, 0.38);
  transform: translateY(-2px);
}

.page-about .team-card__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--faint);
}

.page-about .team-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .team-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---- 发展历程 ---- */
.page-about .about-section--history {
  border-top: 1px solid var(--line);
  padding-block: clamp(34px, 5vw, 64px);
}

.page-about .history-stage {
  position: relative;
  isolation: isolate;
}

.page-about .history-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.2;
}

.page-about .history-stage::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(
    180deg,
    rgba(7, 26, 21, 0.92),
    rgba(7, 26, 21, 0.74) 55%,
    rgba(7, 26, 21, 0.94)
  );
}

.page-about .history-inner {
  position: relative;
  z-index: 2;
}

.page-about .timeline {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
}

.page-about .timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 20px 0 20px 22px;
  border-left: 1px solid var(--line);
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 26px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .timeline__item--now::before {
  background: var(--orange);
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .timeline__item--now .timeline__year {
  color: var(--orange);
}

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

.page-about .timeline__body h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .timeline__body p {
  margin: 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---- 服务范围 ---- */
.page-about .reach-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-bottom: clamp(22px, 3vw, 32px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .reach-stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  padding: 20px 16px 22px;
  background: var(--panel);
}

.page-about .reach-stat .scoreboard__value {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .reach-stat__unit {
  margin-left: 2px;
  font-size: 0.48em;
  font-weight: 500;
  color: var(--faint);
}

.page-about .reach-stat .scoreboard__label {
  font-size: 12.5px;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--mist);
}

/* ---- 页尾行动区 ---- */
.page-about .about-cta {
  margin-top: clamp(30px, 4vw, 52px);
  padding: clamp(22px, 3vw, 34px);
  border: 1px solid var(--line-strong);
  background: linear-gradient(135deg, rgba(29, 90, 72, 0.52), rgba(15, 43, 35, 0.92));
  display: grid;
  gap: 18px;
}

.page-about .about-cta__text {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(19px, 2vw, 25px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-cta__links .btn {
  text-decoration: none;
}

/* ---- 断点 ---- */
@media (min-width: 620px) {
  .page-about .mast-meta {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 780px) {
  .page-about .timeline__item {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 24px;
    padding-left: 24px;
  }
}

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: start;
  }

  .page-about .method-steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 18px;
  }

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

@media (min-width: 980px) {
  .page-about .about-layout {
    grid-template-columns: 192px minmax(0, 1fr);
    gap: clamp(28px, 3.6vw, 56px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
    align-self: start;
    max-height: calc(100vh - 140px);
    overflow-y: auto;
    border-bottom: none;
    border-left: 1px solid var(--line);
    padding: 0 0 0 16px;
  }

  .page-about .about-rail .rail__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-about .about-rail .rail__link {
    border: none;
    border-left: 2px solid transparent;
    padding: 8px 0 8px 12px;
    margin-left: -1px;
    white-space: normal;
  }

  .page-about .about-rail .rail__link:hover,
  .page-about .about-rail .rail__link[aria-current="true"] {
    border-left-color: var(--cyan);
    color: var(--cyan);
  }
}

@media (min-width: 1080px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .about-rail .rail__link {
    transition: none;
  }

  .page-about .team-card:hover,
  .page-about .team-card:focus-within {
    transform: none;
  }
}