.page-about {
  --about-idx-w: 196px;
  padding-bottom: clamp(40px, 6vw, 80px);
}

.page-about .breadcrumb {
  padding-top: 24px;
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  padding-top: clamp(20px, 3vw, 40px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
  align-items: center;
}

.page-about .about-hero__copy h1 {
  font-size: clamp(30px, 5.4vw, 52px);
  line-height: 1.15;
  letter-spacing: -0.012em;
  font-weight: 800;
  margin: 14px 0 0;
  max-width: 20ch;
}

.page-about .about-hero__copy .lead {
  margin: 18px 0 0;
  max-width: 42ch;
  line-height: 1.8;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 30px;
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 13.5px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .about-hero__facts .mono {
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1;
  color: var(--ink);
}

.page-about .about-hero__copy .btn-row {
  margin-top: 30px;
}

.page-about .about-hero__media {
  margin: 0;
  position: relative;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-bg-2);
  aspect-ratio: 7 / 5;
}

.page-about .about-hero__media .media__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: 100%;
  height: auto;
}

.page-about .about-hero__media .media__img {
  height: 100%;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: clamp(36px, 5vw, 76px);
  }
}

/* ---------- 章节索引 + 叙事栏 ---------- */
.page-about .about-pass {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
  margin-top: clamp(48px, 7vw, 96px);
}

.page-about .about-index {
  padding-top: 16px;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-index__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-index__link {
  display: block;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-size: 13px;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--ink);
  border-color: rgba(255, 106, 26, 0.55);
  background: rgba(255, 106, 26, 0.08);
}

@media (min-width: 1000px) {
  .page-about .about-pass {
    grid-template-columns: var(--about-idx-w) minmax(0, 1fr);
    gap: clamp(36px, 4.5vw, 68px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-index__list {
    flex-direction: column;
    overflow: visible;
    gap: 0;
    padding: 0;
    margin-top: 16px;
  }

  .page-about .about-index__link {
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0;
    padding: 9px 0 9px 16px;
    white-space: normal;
    background: transparent;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    border-left-color: var(--huohu-orange);
    color: var(--ink);
    background: transparent;
  }
}

/* ---------- 通用区块 ---------- */
.page-about .about-block {
  padding-top: clamp(44px, 6.5vw, 84px);
}

.page-about .about-flow > .about-block:first-child {
  padding-top: 0;
}

.page-about .about-block__head h2 {
  margin: 12px 0 0;
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.012em;
  font-weight: 700;
  max-width: 24ch;
}

.page-about .about-block__intro {
  margin: 16px 0 0;
  max-width: 46ch;
  color: var(--mist);
  font-size: 15.5px;
  line-height: 1.8;
}

/* ---------- 历程刻度带 ---------- */
.page-about .about-timeline-media {
  margin: 30px 0 0;
  border-radius: var(--radius-m);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-bg-2);
  aspect-ratio: 12 / 5;
}

.page-about .about-timeline-media .media__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-track {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  position: relative;
}

.page-about .about-track__node {
  position: relative;
  padding: 22px 20px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--ink-bg-2);
  transition: border-color 0.24s ease, transform 0.24s ease;
}

.page-about .about-track__node:hover {
  border-color: rgba(255, 106, 26, 0.5);
  transform: translateY(-3px);
}

.page-about .about-track__era {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--huohu-orange);
}

.page-about .about-track__title {
  margin: 10px 0 0;
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .about-track__expand {
  margin-top: 14px;
}

.page-about .about-track__expand .expand__summary {
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
  cursor: pointer;
  transition: color 0.2s ease;
}

.page-about .about-track__expand .expand__summary:hover,
.page-about .about-track__expand .expand__summary:focus-visible {
  color: var(--huohu-orange);
}

.page-about .about-track__expand .expand__body p {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

@media (min-width: 760px) {
  .page-about .about-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
    padding-top: 40px;
  }

  .page-about .about-track::before {
    content: "";
    position: absolute;
    top: 13px;
    left: 4%;
    right: 4%;
    height: 1px;
    background: linear-gradient(
      90deg,
      transparent,
      var(--line-strong) 6%,
      var(--line-strong) 94%,
      transparent
    );
  }

  .page-about .about-track__node::before {
    content: "";
    position: absolute;
    top: -33px;
    left: 20px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--huohu-orange);
    box-shadow: 0 0 0 4px rgba(255, 106, 26, 0.14);
  }
}

/* ---------- 三条业务线 ---------- */
.page-about .about-lines {
  display: grid;
  gap: 14px;
  margin-top: 30px;
}

.page-about .about-line {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 18px;
  align-items: start;
  padding: 22px 22px 24px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--slate);
  border-radius: var(--radius-m);
  background: linear-gradient(100deg, rgba(42, 51, 70, 0.5), rgba(27, 31, 42, 0.92) 62%);
  text-decoration: none;
  color: inherit;
  transition: border-left-color 0.24s ease, transform 0.24s ease;
}

.page-about .about-line:hover,
.page-about .about-line:focus-visible {
  border-left-color: var(--huohu-orange);
  transform: translateX(4px);
}

.page-about .about-line__no {
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  color: var(--huohu-orange);
  padding-top: 3px;
}

.page-about .about-line__body h3 {
  margin: 0;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.005em;
}

.page-about .about-line__body p {
  margin: 11px 0 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.78;
  max-width: 58ch;
}

.page-about .about-line__go {
  display: inline-block;
  margin-top: 15px;
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--huohu-orange);
  border-bottom: 1px solid rgba(255, 106, 26, 0.4);
  padding-bottom: 2px;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: var(--gap, 20px);
  margin-top: 30px;
  grid-template-columns: 1fr;
}

.page-about .about-team__total {
  display: grid;
  gap: 16px 30px;
  padding: 26px 24px 28px;
  border-radius: var(--radius-l);
  border: 1px solid rgba(255, 106, 26, 0.28);
  background: linear-gradient(
    120deg,
    rgba(255, 106, 26, 0.16),
    rgba(255, 138, 61, 0.05) 45%,
    rgba(27, 31, 42, 0.72)
  );
}

.page-about .about-team__big {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(52px, 9vw, 76px);
  line-height: 0.9;
  color: var(--ink);
  letter-spacing: -0.02em;
}

.page-about .about-team__biglabel {
  margin: 0;
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--huohu-orange);
}

.page-about .about-team__total-body p:last-child {
  margin: 10px 0 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.78;
  max-width: 62ch;
}

.page-about .about-team__cell {
  padding: 22px 20px 24px;
  border-radius: var(--radius-m);
  border: 1px solid var(--line);
  background: var(--ink-bg-2);
  transition: border-color 0.24s ease, transform 0.24s ease;
}

.page-about .about-team__cell:hover {
  border-color: rgba(255, 106, 26, 0.45);
  transform: translateY(-3px);
}

.page-about .about-team__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 40px;
  line-height: 1;
  color: var(--huohu-orange);
  letter-spacing: -0.01em;
}

.page-about .about-team__cell h3 {
  margin: 14px 0 0;
  font-size: 16.5px;
  font-weight: 700;
}

.page-about .about-team__cell p:last-child {
  margin: 9px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

@media (min-width: 700px) {
  .page-about .about-team__total {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: center;
  }
}

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

  .page-about .about-team__total {
    grid-column: 1 / -1;
  }
}

/* ---------- 校对流程 ---------- */
.page-about .about-check {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--line);
}

.page-about .about-check__step {
  display: grid;
  grid-template-columns: 1fr;
  gap: 9px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-check__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--huohu-orange);
}

.page-about .about-check__step h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
}

.page-about .about-check__step p {
  margin: 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.78;
  max-width: 60ch;
}

.page-about .about-check__foot {
  margin: 22px 0 0;
  padding: 4px 0 4px 18px;
  border-left: 2px solid var(--archive-teal);
  color: var(--mist);
  font-size: 14.5px;
  line-height: 1.72;
}

@media (min-width: 780px) {
  .page-about .about-check__step {
    grid-template-columns: 56px minmax(120px, 0.6fr) minmax(0, 1.8fr);
    align-items: baseline;
    gap: 28px;
    padding: 24px 0;
  }
}

/* ---------- 覆盖范围与协作 ---------- */
.page-about .about-coverage {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: 30px;
}

.page-about .about-coverage__media {
  margin: 0;
  border-radius: var(--radius-m);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-bg-2);
  aspect-ratio: 4 / 3;
}

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

.page-about .about-coverage__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(148px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-stat {
  background: var(--ink-bg-2);
  padding: 20px 18px 18px;
  transition: background-color 0.24s ease;
}

.page-about .about-stat:hover {
  background: var(--slate);
}

.page-about .about-stat__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 40px);
  line-height: 1;
  color: var(--ink);
  letter-spacing: -0.015em;
}

.page-about .about-stat__label {
  margin: 11px 0 0;
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .about-stat__note {
  margin: 9px 0 0;
  font-size: 12.5px;
  line-height: 1.62;
  color: var(--mist);
  opacity: 0.55;
  transition: opacity 0.24s ease, color 0.24s ease;
}

.page-about .about-stat:hover .about-stat__note {
  opacity: 1;
  color: var(--ink);
}

.page-about .about-partners {
  margin-top: 26px;
  padding: 24px 22px 26px;
  border-radius: var(--radius-l);
  border: 1px solid var(--line);
  background: linear-gradient(140deg, rgba(42, 51, 70, 0.66), rgba(16, 18, 24, 0.94) 72%);
}

.page-about .about-partners h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
}

.page-about .about-partners p {
  margin: 12px 0 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.78;
  max-width: 68ch;
}

.page-about .about-partners__tags {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-partners__tags li {
  font-size: 12.5px;
  letter-spacing: 0.05em;
  padding: 7px 15px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  color: var(--mist);
}

@media (min-width: 980px) {
  .page-about .about-coverage {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: 34px;
    align-items: start;
  }
}

/* ---------- 参与方式 ---------- */
.page-about .about-join {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 30px;
}

.page-about .about-join__item {
  display: flex;
  flex-direction: column;
  padding: 24px 22px 26px;
  border-radius: var(--radius-m);
  border: 1px solid var(--line);
  background: var(--ink-bg-2);
  transition: border-color 0.24s ease;
}

.page-about .about-join__item:hover {
  border-color: rgba(255, 106, 26, 0.42);
}

.page-about .about-join__item h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
}

.page-about .about-join__item p {
  margin: 13px 0 0;
  color: var(--mist);
  font-size: 14.5px;
  line-height: 1.78;
  flex: 1 1 auto;
}

.page-about .about-join__link {
  margin-top: 20px;
  align-self: flex-start;
  font-size: 13.5px;
  color: var(--huohu-orange);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 106, 26, 0.4);
  padding-bottom: 2px;
  transition: border-color 0.2s ease;
}

.page-about .about-join__link:hover,
.page-about .about-join__link:focus-visible {
  border-bottom-color: var(--huohu-orange);
}

@media (min-width: 840px) {
  .page-about .about-join {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 收束 CTA ---------- */
.page-about .about-cta {
  margin-top: clamp(48px, 7vw, 88px);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 24px;
  padding: clamp(28px, 5vw, 48px);
  border-radius: var(--radius-l);
  border: 1px solid rgba(255, 106, 26, 0.3);
  background: linear-gradient(
    115deg,
    rgba(255, 106, 26, 0.18),
    rgba(255, 138, 61, 0.05) 42%,
    rgba(16, 18, 24, 0.94)
  );
}

.page-about .about-cta__inner h2 {
  margin: 12px 0 0;
  font-size: clamp(22px, 3.1vw, 32px);
  line-height: 1.26;
  font-weight: 700;
  max-width: 26ch;
}

.page-about .about-cta__inner p {
  margin: 14px 0 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.78;
  max-width: 52ch;
}

@media (min-width: 880px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 44px;
  }
}

/* ---------- 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-track__node,
  .page-about .about-team__cell,
  .page-about .about-stat,
  .page-about .about-line,
  .page-about .about-index__link,
  .page-about .about-stat__note,
  .page-about .about-join__item,
  .page-about .about-join__link {
    transition: none;
  }

  .page-about .about-track__node:hover,
  .page-about .about-team__cell:hover {
    transform: none;
  }

  .page-about .about-line:hover,
  .page-about .about-line:focus-visible {
    transform: none;
  }
}