/* ============================================================
   关于我们 · page-about
   ============================================================ */

.page-about {
  --ab-rail-w: 13.5rem;
  --ab-pad-block: clamp(2.75rem, 6vw, 5.5rem);
  background: var(--ink);
  color: var(--slate);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding-top: calc(var(--header-h) * 0.5 + 0.75rem);
  padding-bottom: 0.9rem;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .breadcrumbs a {
  color: var(--cool);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

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

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  border-bottom: var(--frame) solid var(--line-strong);
  background:
    radial-gradient(85% 120% at 92% 0%, rgba(255, 106, 26, 0.15), transparent 62%),
    linear-gradient(180deg, var(--moss) 0%, var(--ink) 78%);
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 3.5rem);
  padding-top: clamp(0.5rem, 2vw, 1.5rem);
  padding-bottom: clamp(2.5rem, 6vw, 5rem);
}

.page-about .ab-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin: 0 0 1.15rem;
  padding: 0.4rem 0.8rem;
  border: var(--frame) solid var(--line-strong);
  background: rgba(27, 58, 46, 0.6);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--lava-soft);
}

.page-about .ab-kicker__dot {
  width: 8px;
  height: 8px;
  background: var(--lava);
  flex: 0 0 auto;
}

.page-about .ab-hero__title {
  margin: 0 0 1.15rem;
  font-family: var(--font-display);
  font-size: clamp(2.35rem, 7vw, 4.4rem);
  font-weight: 800;
  line-height: 1.03;
  letter-spacing: -0.01em;
  color: var(--slate);
}

.page-about .ab-hero__intro {
  max-width: 46ch;
  margin: 0 0 1.9rem;
  font-size: var(--fs-16);
  line-height: 1.78;
  color: var(--mist);
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(8.5rem, 1fr));
  gap: 0.9rem;
  list-style: none;
  margin: 0 0 2rem;
  padding: 0;
}

.page-about .ab-hero__stats li {
  border-top: var(--frame) solid var(--lava);
  padding-top: 0.65rem;
}

.page-about .ab-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3.6vw, 2.25rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--slate);
}

.page-about .ab-stat__label {
  display: block;
  margin-top: 0.35rem;
  font-size: var(--fs-12);
  line-height: 1.55;
  color: var(--cool);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .ab-hero__visual {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.9rem;
}

.page-about .ab-board {
  display: block;
  width: min(100%, 23rem);
  height: auto;
  filter: drop-shadow(9px 9px 0 rgba(46, 75, 94, 0.42));
}

.page-about .ab-hero__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--cool);
  text-align: center;
}

/* ---------- 画布与左窄栏 ---------- */
.page-about .ab-canvas {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.5rem);
  padding-top: clamp(2rem, 5vw, 3.5rem);
}

.page-about .ab-rail {
  align-self: start;
  padding-top: 0.25rem;
}

.page-about .ab-rail__title {
  margin: 0 0 0.7rem;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--cool);
}

.page-about .ab-rail__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  list-style: none;
  margin: 0 0 1.25rem;
  padding: 0;
}

.page-about .ab-rail__link {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--line-strong);
  background: rgba(27, 58, 46, 0.55);
  font-size: var(--fs-13);
  color: var(--mist);
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  color: var(--lava-soft);
  border-color: var(--lava);
  background: rgba(255, 106, 26, 0.1);
}

.page-about .ab-rail__n {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 700;
  color: var(--lava);
}

.page-about .ab-rail__t {
  white-space: nowrap;
}

.page-about .ab-rail__cycle {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--cool);
}

.page-about .ab-rail__cycle p {
  margin: 0;
}

/* ---------- 章节通用 ---------- */
.page-about .ab-sec {
  padding-block: var(--ab-pad-block);
  border-top: var(--frame) solid var(--line);
}

.page-about .ab-flow > .ab-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .ab-sec--moss {
  background: var(--moss);
  border-block: var(--frame) solid var(--line);
  padding-inline: 1rem;
  margin-inline: -1rem;
}

.page-about .ab-sec .section__head {
  margin-bottom: 1.15rem;
}

.page-about .ab-sec .section__title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.6rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--slate);
}

.page-about .ab-sec .section__num {
  font-family: var(--font-mono);
}

.page-about .ab-lead {
  max-width: 62ch;
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 01 团队 ---------- */
.page-about .ab-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  list-style: none;
  margin: 2.25rem 0 0;
  padding: 0;
  border: var(--frame) solid var(--line-strong);
  background: rgba(27, 58, 46, 0.35);
}

.page-about .ab-role {
  display: grid;
  grid-template-columns: 4.25rem minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
  padding: 1.35rem 1.15rem 1.5rem;
  border-bottom: 1px solid var(--line);
}

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

.page-about .ab-role__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 6vw, 3rem);
  font-weight: 700;
  line-height: 1;
  color: var(--lava);
}

.page-about .ab-role__name {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: var(--fs-20);
  font-weight: 700;
  color: var(--slate);
}

.page-about .ab-role__text p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--mist);
}

.page-about .ab-handoff {
  margin: 1.75rem 0 0;
  padding-left: 1rem;
  border-left: var(--frame) solid var(--lava);
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--mist);
  max-width: 62ch;
}

/* ---------- 02 流程 ---------- */
.page-about .ab-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 11.5rem), 1fr));
  gap: 0;
  list-style: none;
  margin: 2.25rem 0 0;
  padding: 0;
  border: var(--frame) solid var(--line-strong);
  background: var(--ink);
}

.page-about .ab-step {
  position: relative;
  padding: 1.6rem 1rem 1.5rem;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--lava);
}

.page-about .ab-step__n {
  display: block;
  margin-bottom: 0.55rem;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--lava);
}

.page-about .ab-step__name {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: var(--fs-20);
  font-weight: 700;
  color: var(--slate);
}

.page-about .ab-step__desc {
  margin: 0 0 0.85rem;
  font-size: var(--fs-13);
  line-height: 1.72;
  color: var(--mist);
}

.page-about .ab-step__field {
  margin: 0;
  padding-top: 0.6rem;
  border-top: 1px dashed var(--line-strong);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--cool);
}

/* ---------- 图片容器 ---------- */
.page-about .ab-figure {
  margin: clamp(1.75rem, 4vw, 2.75rem) 0 0;
}

.page-about .ab-figure .media {
  border: var(--frame) solid var(--line-strong);
}

.page-about .ab-figure .media__caption {
  display: block;
  margin-top: 0.7rem;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  line-height: 1.65;
  color: var(--cool);
}

/* ---------- 03 时间线 ---------- */
.page-about .ab-tl {
  position: relative;
  display: flex;
  gap: 1.15rem;
  margin-top: 2.5rem;
  padding: 2.5rem 0.25rem 1.5rem;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-color: var(--deep-blue) transparent;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  top: 1.25rem;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--cool);
  opacity: 0.45;
}

.page-about .ab-tl__node {
  position: relative;
  flex: 0 0 min(78vw, 16.5rem);
  scroll-snap-align: start;
  padding: 1.15rem 1rem 1.35rem;
  border: var(--frame) solid var(--line);
  background: rgba(27, 58, 46, 0.42);
}

.page-about .ab-tl__node::before {
  content: "";
  position: absolute;
  top: -1.75rem;
  left: 1rem;
  width: 16px;
  height: 16px;
  border: 2px solid var(--cool);
  background: var(--ink);
  border-radius: 50%;
}

.page-about .ab-tl__node:last-child {
  border-color: var(--lava);
}

.page-about .ab-tl__node:last-child::before {
  background: var(--lava);
  border-color: var(--lava);
}

.page-about .ab-tl__phase {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--lava-soft);
}

.page-about .ab-tl__name {
  margin: 0 0 0.55rem;
  font-family: var(--font-display);
  font-size: var(--fs-20);
  font-weight: 700;
  line-height: 1.25;
  color: var(--slate);
}

.page-about .ab-tl__desc {
  margin: 0;
  font-size: var(--fs-13);
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 呼吸口 ---------- */
.page-about .ab-breathe {
  padding-block: clamp(3.5rem, 12vw, 8.5rem);
  border-top: var(--frame) solid var(--line);
  border-bottom: var(--frame) solid var(--line);
  background: linear-gradient(90deg, rgba(255, 106, 26, 0.08) 0%, transparent 62%);
}

.page-about .ab-breathe__quote {
  max-width: 26ch;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4.6vw, 2.75rem);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--slate);
}

/* ---------- 04 术语 ---------- */
.page-about .ab-terms {
  margin: 2.25rem 0 0;
}

.page-about .ab-term {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.6rem;
  padding: 1.15rem 0;
  border-top: 1px solid var(--line);
}

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

.page-about .ab-term__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 0.75rem;
}

.page-about .ab-term__zh {
  font-family: var(--font-display);
  font-size: var(--fs-20);
  font-weight: 700;
  color: var(--slate);
}

.page-about .ab-term__en {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--lava-soft);
}

.page-about .ab-term__body p {
  margin: 0 0 0.5rem;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--mist);
}

.page-about .ab-term__field {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--cool);
}

/* ---------- 05 合作 ---------- */
.page-about .ab-coop {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 2.25rem;
  border: var(--frame) solid var(--line-strong);
  background: var(--line);
}

.page-about .ab-coop__item {
  padding: 1.4rem 1.2rem 1.6rem;
  background: var(--moss-mid);
}

.page-about .ab-coop__num {
  display: block;
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 6vw, 2.85rem);
  font-weight: 700;
  line-height: 1;
  color: var(--lava);
}

.page-about .ab-coop__name {
  margin: 0 0 0.55rem;
  font-family: var(--font-display);
  font-size: var(--fs-20);
  font-weight: 700;
  line-height: 1.3;
  color: var(--slate);
}

.page-about .ab-coop__item p {
  margin: 0;
  font-size: var(--fs-13);
  line-height: 1.75;
  color: var(--mist);
}

.page-about .ab-share {
  margin: 1.75rem 0 0;
  padding-left: 1rem;
  border-left: var(--frame) solid var(--verify);
  max-width: 62ch;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 06 节奏与联系 ---------- */
.page-about .ab-cadence {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 2.75rem);
  margin-top: 1.75rem;
}

.page-about .ab-cadence__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-cadence__list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.3rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-cadence__k {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--lava-soft);
}

.page-about .ab-cadence__v {
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--slate);
}

.page-about .ab-contact {
  border: var(--frame) solid var(--line-strong);
  background: var(--ink);
  padding: 1.35rem 1.15rem 1.5rem;
}

.page-about .ab-contact__lead {
  margin: 0 0 1.15rem;
  font-size: var(--fs-14);
  line-height: 1.78;
  color: var(--mist);
}

.page-about .ab-contact__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem 0.7rem;
  padding: 0.7rem 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-contact__key {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--cool);
}

.page-about .ab-contact__val {
  flex: 1 1 12rem;
  min-width: 0;
  overflow-wrap: anywhere;
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  color: var(--slate);
}

.page-about .ab-contact__note {
  margin: 1rem 0 0;
  font-size: var(--fs-13);
  line-height: 1.75;
  color: var(--cool);
}

.page-about .ab-contact__more {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  margin: 1.15rem 0 0;
}

.page-about .ab-inline-link {
  font-size: var(--fs-13);
  color: var(--lava-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .ab-inline-link:hover,
.page-about .ab-inline-link:focus-visible {
  color: var(--lava);
  border-bottom-color: var(--lava);
}

/* ---------- 中屏 ---------- */
@media (min-width: 760px) {
  .page-about .ab-coop {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-role {
    grid-template-columns: 5.5rem minmax(0, 1fr);
    gap: 1.5rem;
    padding: 1.6rem 1.5rem 1.75rem;
  }

  .page-about .ab-term {
    grid-template-columns: minmax(0, 14rem) minmax(0, 1fr);
    gap: 0.75rem 1.75rem;
    align-items: start;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1024px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: center;
    padding-top: 1rem;
  }

  .page-about .ab-canvas {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-about .ab-rail {
    position: sticky;
    top: calc(var(--header-h) + 1.75rem);
    padding-left: 1rem;
    border-left: var(--frame) solid var(--line-strong);
  }

  .page-about .ab-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
  }

  .page-about .ab-rail__link {
    border: 0;
    border-bottom: 1px solid var(--line);
    background: transparent;
    padding: 0.55rem 0;
    justify-content: flex-start;
  }

  .page-about .ab-rail__link:hover,
  .page-about .ab-rail__link:focus-visible {
    border-bottom-color: var(--lava);
    background: transparent;
  }

  .page-about .ab-rail__t {
    white-space: normal;
    line-height: 1.45;
  }

  .page-about .ab-rail__cycle {
    flex-direction: column;
    gap: 0.25rem;
  }

  .page-about .ab-cadence {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .ab-cadence__list li {
    grid-template-columns: 6.5rem minmax(0, 1fr);
    gap: 1rem;
    align-items: baseline;
  }

  .page-about .ab-sec--moss {
    padding-inline: 1.75rem;
    margin-inline: -1.75rem;
  }

  .page-about .ab-tl__node {
    flex: 0 0 18rem;
  }
}

/* 降低动效偏好 */
@media (prefers-reduced-motion: reduce) {
  .page-about .ab-rail__link,
  .page-about .ab-inline-link,
  .page-about .breadcrumbs a {
    transition: none;
  }

  .page-about .ab-tl {
    scroll-behavior: auto;
  }
}
<<<END>>>