.page-about {
  color: var(--ivory);
  padding-bottom: clamp(40px, 6vw, 88px);
}

.page-about .about-crumbs {
  padding-top: clamp(14px, 2.5vw, 26px);
}

/* 首屏门廊 */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 3.6vw, 44px) 0 clamp(34px, 6vw, 76px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 10% 0%, rgba(201, 162, 39, 0.18), transparent 62%),
    radial-gradient(90% 80% at 94% 14%, rgba(60, 224, 208, 0.12), transparent 66%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  align-items: center;
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line-gold);
  background: linear-gradient(160deg, var(--night), var(--purple));
  box-shadow: 0 26px 64px rgba(9, 5, 18, 0.6);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-hero__figure figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 26px 16px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold-light);
  background: linear-gradient(to top, rgba(16, 11, 29, 0.94), transparent);
}

.page-about .about-hero__copy h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.2vw, 54px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--gold-light);
  text-shadow: 0 12px 40px rgba(201, 162, 39, 0.22);
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 54ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-seals {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-seal {
  flex: 1 1 108px;
  min-width: 104px;
  padding: 14px 18px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line-gold);
  background: linear-gradient(150deg, rgba(201, 162, 39, 0.18), rgba(201, 162, 39, 0.03));
}

.page-about .about-seal__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 26px;
  line-height: 1;
  color: var(--gold-light);
}

.page-about .about-seal__label {
  display: block;
  margin-top: 7px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* 主体：窄索引 + 宽叙事 */
.page-about .about-body {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  padding-top: clamp(30px, 5vw, 64px);
}

.page-about .about-index {
  border-left: 2px solid var(--line-gold);
  padding-left: 16px;
}

.page-about .about-index__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 10px;
  border-radius: var(--radius-sm);
  color: var(--mist);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.5;
  transition: color 0.22s var(--ease), background 0.22s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--ivory);
  background: rgba(255, 255, 255, 0.07);
}

.page-about .about-index__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .about-index__top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 20px;
  padding: 9px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line-cyan);
  font-size: 13px;
  color: var(--cyan);
  text-decoration: none;
  transition: background 0.22s var(--ease), color 0.22s var(--ease);
}

.page-about .about-index__top:hover,
.page-about .about-index__top:focus-visible {
  background: rgba(60, 224, 208, 0.12);
  color: var(--ivory);
}

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

/* 章节通用 */
.page-about .about-section {
  padding: clamp(26px, 4vw, 46px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-section__head {
  max-width: 64ch;
}

.page-about .about-section__kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-section__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.2vw, 36px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--ivory);
}

.page-about .about-section__lead {
  margin: 14px 0 0;
  font-size: clamp(15px, 1.5vw, 16px);
  line-height: 1.82;
  color: var(--mist);
}

.page-about .about-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(60, 224, 208, 0.4);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--gold-light);
  border-color: var(--line-gold);
}

/* 里程碑 */
.page-about .about-miles {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .about-mile {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-top: 1px dashed var(--line-strong);
}

.page-about .about-mile:last-child {
  border-bottom: 1px dashed var(--line-strong);
}

.page-about .about-mile__year {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 18px;
  letter-spacing: 0.04em;
  color: var(--gold);
  padding-top: 2px;
}

.page-about .about-mile__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 900;
  line-height: 1.35;
  color: var(--ivory);
}

.page-about .about-mile__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

/* 版本年轮：酒红分区 */
.page-about .about-ruby {
  padding: clamp(22px, 3.6vw, 42px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.1);
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(255, 107, 74, 0.16), transparent 60%),
    linear-gradient(155deg, #4b1430, var(--ruby) 58%, #360d21);
}

.page-about .about-ruby .about-section__kicker {
  color: var(--gold-light);
}

.page-about .about-ruby .about-section__lead {
  color: #efe0e6;
}

.page-about .eras {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .era {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 14px;
  padding: 18px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(15, 10, 26, 0.34);
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .era:hover,
.page-about .era:focus-within {
  border-color: var(--line-gold);
  background: rgba(15, 10, 26, 0.52);
  transform: translateX(3px);
}

.page-about .era__ver {
  align-self: start;
  display: grid;
  place-content: center;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: 1px solid var(--line-gold);
  background: radial-gradient(circle at 50% 32%, rgba(201, 162, 39, 0.3), transparent 72%);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: 0.04em;
  color: var(--gold-light);
}

.page-about .era__span {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .era__body h3 {
  margin: 6px 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  line-height: 1.4;
  color: var(--ivory);
}

.page-about .era__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: #ecdde3;
}

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

.page-about .era__tags li {
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(240, 215, 122, 0.42);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--gold-light);
}

/* 配图 */
.page-about .about-figure {
  margin: 26px 0 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--line-gold);
  background: var(--night);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure--tall img {
  aspect-ratio: 5 / 7;
}

.page-about .about-figure figcaption {
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
  border-top: 1px solid var(--line);
}

/* 团队 */
.page-about .team-grid {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .team-card {
  padding: 20px 20px 22px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--surface);
}

.page-about .team-card--a { border-top: 2px solid var(--gold); }
.page-about .team-card--b { border-top: 2px solid var(--cyan); }
.page-about .team-card--c { border-top: 2px solid var(--coral); }

.page-about .team-card__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 32px;
  line-height: 1;
}

.page-about .team-card--a .team-card__num { color: var(--gold-light); }
.page-about .team-card--b .team-card__num { color: var(--cyan); }
.page-about .team-card--c .team-card__num { color: var(--coral); }

.page-about .team-card h3 {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  color: var(--ivory);
}

.page-about .team-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mist);
}

/* 数据带 */
.page-about .about-stats {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-stats li {
  padding: 16px 18px;
  background: var(--night);
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 22px;
  letter-spacing: 0.03em;
  color: var(--gold-light);
}

.page-about .about-stats__label {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* 合作生态：深蓝绿分区 */
.page-about .about-teal {
  padding: clamp(22px, 3.6vw, 42px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(60, 224, 208, 0.2);
  background:
    radial-gradient(110% 90% at 0% 0%, rgba(60, 224, 208, 0.16), transparent 62%),
    linear-gradient(150deg, #0b302f, var(--teal) 62%, #072b29);
}

.page-about .about-teal .about-section__kicker {
  color: var(--cyan);
}

.page-about .about-teal .about-section__lead {
  color: #cfe6e2;
}

.page-about .partner-pills {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .partner-open {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 18px;
  align-items: center;
  margin-top: 26px;
  padding: 20px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(60, 224, 208, 0.24);
  background: rgba(7, 30, 29, 0.5);
}

.page-about .partner-open__no {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 46px;
  line-height: 1;
  text-align: center;
  color: var(--gold-light);
}

.page-about .partner-open h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  color: var(--ivory);
}

.page-about .partner-open p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: #cfe6e2;
}

.page-about .partner-note {
  margin: 22px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: #bcdcd8;
}

/* 内容流程折叠 */
.page-about .about-steps {
  margin-top: 26px;
  display: grid;
  gap: 10px;
}

.page-about .about-steps .accordion__item {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  overflow: hidden;
  transition: border-color 0.24s var(--ease);
}

.page-about .about-steps .accordion__item:hover {
  border-color: var(--line-gold);
}

.page-about .about-steps .accordion__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  width: 100%;
  min-height: 52px;
  padding: 15px 18px;
  border: 0;
  background: transparent;
  color: var(--ivory);
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.5;
  text-align: left;
  cursor: pointer;
}

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

.page-about .about-steps .accordion__icon {
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--gold);
  transition: transform 0.24s var(--ease), color 0.24s var(--ease);
}

.page-about .about-steps .accordion__trigger[aria-expanded="true"] .accordion__icon {
  transform: rotate(45deg);
  color: var(--cyan);
}

.page-about .about-steps .accordion__panel {
  border-left: 2px solid transparent;
  transition: border-color 0.24s var(--ease);
}

.page-about .about-steps .accordion__trigger[aria-expanded="true"] + .accordion__panel {
  border-left-color: var(--gold);
}

.page-about .about-steps .accordion__inner {
  padding: 0 18px 18px;
}

.page-about .about-steps .accordion__body p {
  margin: 0;
  font-size: 14.8px;
  line-height: 1.82;
  color: var(--mist);
}

/* 服务与联络 */
.page-about .about-service {
  padding: clamp(22px, 3.6vw, 40px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-gold);
  background:
    radial-gradient(110% 100% at 100% 0%, rgba(201, 162, 39, 0.14), transparent 60%),
    linear-gradient(160deg, rgba(43, 27, 74, 0.92), rgba(21, 15, 38, 0.96));
}

.page-about .service-rows {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .service-row {
  display: grid;
  gap: 8px;
  padding: 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
}

.page-about .service-row__key {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .service-row__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17.5px;
  line-height: 1.4;
  color: var(--ivory);
  overflow-wrap: anywhere;
}

.page-about .service-row__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
  overflow-wrap: anywhere;
}

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

/* 响应式 */
@media (min-width: 720px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .service-row {
    grid-template-columns: 132px minmax(0, 1fr);
    align-items: start;
    gap: 18px;
    padding: 20px 22px;
  }

  .page-about .service-row__key {
    padding-top: 4px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: 5fr 7fr;
    gap: clamp(30px, 4vw, 56px);
  }

  .page-about .about-mile {
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 24px;
  }

  .page-about .about-mile__year {
    font-size: 21px;
  }

  .page-about .era {
    grid-template-columns: 68px minmax(0, 1fr);
    gap: 20px;
    padding: 22px;
  }

  .page-about .about-figure--tall {
    max-width: 460px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 226px minmax(0, 1fr);
    align-items: start;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .era,
  .page-about .accordion__icon,
  .page-about .about-index__link,
  .page-about .about-index__top,
  .page-about .about-link {
    transition: none;
  }

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