.page-about {
  --about-gap: clamp(56px, 8vw, 108px);
  background: var(--cream);
  color: var(--ink);
}

.page-about .about-section {
  padding: var(--about-gap) 0;
}

.page-about .section-head {
  max-width: 760px;
}

.page-about .section-head h2 {
  margin: 10px 0 0;
  font-size: clamp(1.6rem, 3.6vw, 2.5rem);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.01em;
}

.page-about .section-head .lede {
  margin-top: 16px;
  font-size: clamp(1rem, 1.3vw, 1.08rem);
  line-height: 1.85;
  color: rgba(36, 26, 18, 0.74);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(18px, 3vw, 34px) 0 clamp(46px, 6vw, 82px);
  background:
    radial-gradient(120% 88% at 88% 4%, rgba(255, 107, 26, 0.11), rgba(255, 107, 26, 0) 58%),
    linear-gradient(180deg, rgba(14, 122, 60, 0.12), rgba(14, 122, 60, 0) 48%);
  overflow: hidden;
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 56px);
  align-items: start;
}

.page-about .about-hero__lede .breadcrumb {
  margin-bottom: 20px;
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-size: clamp(2rem, 6vw, 3.6rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-wrap: balance;
}

.page-about .about-hero .lede {
  margin-top: 20px;
  font-size: clamp(1rem, 1.4vw, 1.1rem);
  line-height: 1.85;
  color: rgba(36, 26, 18, 0.78);
  max-width: 46ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .anchor-rail {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 30px 0 0;
  padding: 16px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .anchor-rail a {
  display: inline-block;
  padding-bottom: 2px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--navy);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-about .anchor-rail a:hover,
.page-about .anchor-rail a:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

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

.page-about .about-hero__media .media-frame {
  border-radius: var(--radius);
}

.page-about .about-hero__card {
  position: relative;
  margin: -54px 14px 0;
  padding: 20px 22px 22px;
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.62);
  box-shadow: 0 20px 44px rgba(8, 59, 32, 0.16);
}

.page-about .about-hero__card-label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--green);
  text-transform: uppercase;
}

.page-about .about-hero__card-num {
  margin: 8px 0 0;
  font-size: clamp(1.4rem, 3.4vw, 1.9rem);
  font-weight: 800;
  line-height: 1.2;
  color: var(--green-deep);
}

.page-about .about-hero__card-num .num {
  color: var(--orange);
}

.page-about .about-hero__card-note {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(36, 26, 18, 0.72);
}

/* ---------- 受众 ---------- */
.page-about .audience-list {
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .audience-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 18px;
  padding: 26px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .audience-item__no {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  line-height: 1;
  color: var(--green);
}

.page-about .audience-item__body h3 {
  margin: 0;
  font-size: clamp(1.1rem, 2.2vw, 1.32rem);
  font-weight: 800;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .audience-item__body p {
  margin: 12px 0 0;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(36, 26, 18, 0.76);
}

.page-about .audience-item__link {
  grid-column: 2 / -1;
  justify-self: start;
  margin-top: 4px;
  font-size: 14px;
  font-weight: 700;
  color: var(--orange);
  text-decoration: none;
  border-bottom: 2px solid var(--orange-soft);
  padding-bottom: 2px;
  transition: border-color 0.16s var(--ease), color 0.16s var(--ease);
}

.page-about .audience-item__link:hover,
.page-about .audience-item__link:focus-visible {
  color: var(--green);
  border-bottom-color: var(--green);
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-coverage {
  background: var(--green-deep);
  color: var(--cream);
}

.page-about .section-head--invert h2 {
  color: var(--cream);
}

.page-about .section-head--invert .lede {
  color: rgba(251, 246, 236, 0.76);
}

.page-about .section-head--invert .eyebrow {
  color: var(--yellow);
}

.page-about .coverage-metrics {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 36px;
}

.page-about .coverage-metric {
  padding: 22px 20px 24px;
  border: 1px solid rgba(251, 246, 236, 0.22);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(251, 246, 236, 0.08), rgba(251, 246, 236, 0.02));
  transition: transform 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .coverage-metric:hover,
.page-about .coverage-metric:focus-within {
  transform: translateY(-2px);
  border-color: var(--orange);
}

.page-about .coverage-metric--current {
  border-color: rgba(255, 201, 60, 0.55);
  background: linear-gradient(180deg, rgba(255, 201, 60, 0.16), rgba(255, 201, 60, 0.04));
}

.page-about .coverage-metric__num {
  margin: 0;
  font-size: clamp(1.9rem, 4.4vw, 2.8rem);
  font-weight: 800;
  line-height: 1;
  color: var(--yellow);
  font-variant-numeric: tabular-nums;
}

.page-about .coverage-metric__title {
  margin: 10px 0 0;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--cream);
}

.page-about .coverage-metric__desc {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(251, 246, 236, 0.72);
}

.page-about .field-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 26px;
}

.page-about .field-card {
  padding: 22px 20px 24px;
  border-left: 4px solid var(--orange);
  border-radius: 0 12px 12px 0;
  background: rgba(251, 246, 236, 0.06);
}

.page-about .field-card h3 {
  margin: 12px 0 0;
  font-size: 1.06rem;
  font-weight: 800;
  line-height: 1.45;
  color: var(--cream);
}

.page-about .field-card p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(251, 246, 236, 0.74);
}

.page-about .coverage-note {
  margin: 40px 0 0;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--yellow);
}

.page-about .league-matrix {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .league-cell {
  position: relative;
  padding: 14px 16px 16px;
  border: 1px solid rgba(216, 228, 217, 0.28);
  border-radius: 10px;
  background: rgba(251, 246, 236, 0.04);
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .league-cell:hover,
.page-about .league-cell:focus-visible {
  background: rgba(255, 107, 26, 0.16);
  border-color: var(--orange);
  transform: translateY(-2px);
  outline: none;
}

.page-about .league-cell__label {
  display: block;
  font-size: 14px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .league-cell__tip {
  display: block;
  margin-top: 7px;
  font-size: 12.5px;
  line-height: 1.7;
  color: rgba(251, 246, 236, 0.7);
}

/* ---------- 团队 ---------- */
.page-about .team-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 36px;
}

.page-about .team-layout__figure {
  border-radius: var(--radius);
}

.page-about .team-layout__lead {
  margin: 0;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(36, 26, 18, 0.78);
}

.page-about .team-band {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .team-band__item {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "no role"
    "no desc";
  gap: 4px 14px;
  padding: 16px 16px 18px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 4px solid var(--green);
  border-radius: 10px;
  transition: transform 0.18s var(--ease), box-shadow 0.18s var(--ease), border-left-color 0.18s var(--ease);
}

.page-about .team-band__item:hover,
.page-about .team-band__item:focus-visible {
  transform: translateY(-2px);
  border-left-color: var(--orange);
  box-shadow: 0 12px 26px rgba(8, 59, 32, 0.1);
  outline: none;
}

.page-about .team-band__no {
  grid-area: no;
  align-self: start;
  min-width: 46px;
  font-size: 1.15rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--green);
  font-variant-numeric: tabular-nums;
}

.page-about .team-band__role {
  grid-area: role;
  font-size: 15px;
  font-weight: 800;
  color: var(--ink);
}

.page-about .team-band__desc {
  grid-area: desc;
  font-size: 13.5px;
  line-height: 1.72;
  color: rgba(36, 26, 18, 0.7);
}

.page-about .team-layout__foot {
  margin: 22px 0 0;
  padding-top: 18px;
  border-top: 1px dashed var(--line);
  font-size: 14px;
  line-height: 1.8;
  color: var(--navy);
}

/* ---------- 版本时间线 ---------- */
.page-about .timeline {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: 38px;
}

.page-about .timeline__rail {
  padding: 16px 18px;
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(14, 122, 60, 0.12), rgba(19, 50, 79, 0.08));
  border: 1px solid var(--line);
}

.page-about .timeline__rail-title {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--navy);
}

.page-about .timeline__scale {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline__scale li {
  font-size: 13px;
  color: rgba(36, 26, 18, 0.62);
}

.page-about .timeline__scale .num {
  display: inline-block;
  margin-right: 6px;
  font-weight: 700;
  color: var(--green);
}

.page-about .timeline__list {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
  border-left: 2px solid var(--line);
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 30px;
  transition: transform 0.18s var(--ease);
}

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

.page-about .timeline__dot {
  position: absolute;
  left: -34px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--paper);
  border: 3px solid var(--green);
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .timeline__item:hover .timeline__dot,
.page-about .timeline__item:focus-visible .timeline__dot {
  border-color: var(--orange);
  background: var(--orange-soft);
  transform: scale(1.15);
}

.page-about .timeline__item:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 6px;
  border-radius: 8px;
}

.page-about .timeline__item--current .timeline__dot {
  border-color: var(--orange);
  background: var(--yellow);
}

.page-about .timeline__stage {
  margin: 0;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--navy);
}

.page-about .timeline__item h3 {
  margin: 8px 0 0;
  font-size: clamp(1.06rem, 2vw, 1.24rem);
  font-weight: 800;
  line-height: 1.42;
  color: var(--ink);
}

.page-about .timeline__item p:last-child {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(36, 26, 18, 0.74);
}

.page-about .timeline__figure {
  margin: 40px 0 0;
  border-radius: var(--radius);
}

/* ---------- 资料库 ---------- */
.page-about .about-library {
  background: linear-gradient(180deg, rgba(216, 228, 217, 0.42), rgba(251, 246, 236, 0));
}

.page-about .library-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 34px;
}

.page-about .library-card {
  padding: 26px 22px 28px;
  border-radius: var(--radius);
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 5px solid var(--green);
}

.page-about .library-card--alt {
  border-top-color: var(--navy);
}

.page-about .library-card h3 {
  margin: 14px 0 0;
  font-size: clamp(1.1rem, 2.2vw, 1.32rem);
  font-weight: 800;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .library-card > p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(36, 26, 18, 0.74);
}

.page-about .library-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .library-facts li {
  padding: 7px 13px;
  font-size: 13px;
  font-weight: 600;
  color: var(--green-deep);
  background: rgba(14, 122, 60, 0.1);
  border-radius: 999px;
}

.page-about .library-card--alt .library-facts li {
  color: var(--navy);
  background: rgba(19, 50, 79, 0.1);
}

.page-about .library-facts .num {
  font-weight: 800;
}

.page-about .library-cycle {
  margin: 26px 0 0;
  padding: 18px 20px;
  border-left: 4px solid var(--orange);
  background: rgba(255, 217, 188, 0.36);
  border-radius: 0 12px 12px 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(36, 26, 18, 0.8);
}

/* ---------- 设备 ---------- */
.page-about .device-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 34px;
}

.page-about .device-card {
  padding: 26px 22px 28px;
  border-radius: var(--radius);
  background: var(--paper);
  border: 1px solid var(--line);
}

.page-about .device-card--accent {
  background: linear-gradient(165deg, var(--green) 0%, var(--green-deep) 100%);
  border-color: transparent;
  color: var(--cream);
}

.page-about .device-card__label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--navy);
}

.page-about .device-card--accent .device-card__label {
  color: var(--yellow);
}

.page-about .device-card h3 {
  margin: 12px 0 0;
  font-size: clamp(1.1rem, 2.2vw, 1.3rem);
  font-weight: 800;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .device-card--accent h3 {
  color: var(--cream);
}

.page-about .device-card p:last-child {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(36, 26, 18, 0.74);
}

.page-about .device-card--accent p:last-child {
  color: rgba(251, 246, 236, 0.82);
}

.page-about .device-note {
  margin: 24px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--navy);
}

/* ---------- 合作 ---------- */
.page-about .about-partners {
  background: var(--cream);
}

.page-about .partner-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

.page-about .partner-layout__lead h2 {
  margin: 10px 0 0;
  font-size: clamp(1.6rem, 3.6vw, 2.4rem);
  font-weight: 800;
  line-height: 1.22;
  color: var(--ink);
}

.page-about .partner-layout__lead p {
  margin: 16px 0 0;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(36, 26, 18, 0.76);
}

.page-about .partner-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  align-content: start;
}

.page-about .partner-cell {
  padding: 20px 18px 22px;
  border-radius: var(--radius);
  background: var(--paper);
  border: 1px solid var(--line);
  transition: transform 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .partner-cell:hover,
.page-about .partner-cell:focus-within {
  transform: translateY(-2px);
  border-color: var(--green);
}

.page-about .partner-cell__num {
  margin: 0;
  font-size: clamp(1.7rem, 4vw, 2.3rem);
  font-weight: 800;
  line-height: 1;
  color: var(--green);
  font-variant-numeric: tabular-nums;
}

.page-about .partner-cell__label {
  margin: 10px 0 0;
  font-size: 13.5px;
  letter-spacing: 0.04em;
  color: rgba(36, 26, 18, 0.68);
}

.page-about .partner-note {
  margin: 30px 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: 14.5px;
  line-height: 1.9;
  color: rgba(36, 26, 18, 0.76);
  max-width: 78ch;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding: 0 0 clamp(56px, 8vw, 100px);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  padding: clamp(30px, 5vw, 52px) clamp(22px, 4vw, 48px);
  border-radius: var(--radius);
  background: linear-gradient(140deg, var(--green) 0%, var(--green-deep) 72%);
  color: var(--cream);
  position: relative;
  overflow: hidden;
}

.page-about .about-cta__inner::after {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -80px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 107, 26, 0.42), rgba(255, 107, 26, 0) 68%);
  pointer-events: none;
}

.page-about .about-cta__copy {
  position: relative;
  z-index: 1;
}

.page-about .about-cta .eyebrow {
  color: var(--yellow);
}

.page-about .about-cta h2 {
  margin: 10px 0 0;
  font-size: clamp(1.5rem, 3.4vw, 2.2rem);
  font-weight: 800;
  line-height: 1.24;
  color: var(--cream);
}

.page-about .about-cta__copy p {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(251, 246, 236, 0.82);
  max-width: 62ch;
}

.page-about .about-cta__actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

.page-about .about-cta .btn--ghost {
  color: var(--cream);
  border-color: rgba(251, 246, 236, 0.6);
}

.page-about .about-cta .btn--ghost:hover,
.page-about .about-cta .btn--ghost:focus-visible {
  border-color: var(--orange);
  color: var(--orange);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .coverage-metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

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

@media (min-width: 880px) {
  .page-about .about-hero__inner {
    grid-template-columns: 1.06fr 0.94fr;
    gap: clamp(36px, 5vw, 64px);
  }

  .page-about .about-hero__card {
    width: min(330px, 84%);
    margin: -76px 0 0 -34px;
  }

  .page-about .audience-item {
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: start;
    gap: 6px 26px;
  }

  .page-about .audience-item__link {
    grid-column: 3 / 4;
    justify-self: end;
    margin-top: 6px;
    white-space: nowrap;
  }

  .page-about .team-layout {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .team-layout__figure {
    margin-top: 18px;
  }

  .page-about .timeline {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .timeline__rail {
    position: sticky;
    top: calc(var(--header-h, 116px) + 26px);
  }

  .page-about .timeline__scale {
    flex-direction: column;
    gap: 10px;
  }

  .page-about .timeline__list {
    padding-left: 30px;
  }

  .page-about .timeline__dot {
    left: -38px;
  }

  .page-about .partner-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 36px;
  }
}

@media (min-width: 1024px) {
  .page-about .coverage-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about .coverage-metric,
  .page-about .league-cell,
  .page-about .team-band__item,
  .page-about .partner-cell,
  .page-about .timeline__dot {
    transition: none;
  }

  .page-about .coverage-metric:hover,
  .page-about .league-cell:hover,
  .page-about .team-band__item:hover,
  .page-about .partner-cell:hover {
    transform: none;
  }
}