.page-about {
  background-color: var(--sx-cream);
  color: var(--sx-ink);
  font-family: var(--sx-sans);
  padding-bottom: 64px;
  overflow-x: hidden;
}

.page-about .about-sep {
  margin: 0 8px;
  color: var(--sx-gray);
}

/* ---------- 贯穿全页的竖向时间轴 ---------- */
.page-about .about-rail {
  position: relative;
  padding-left: 22px;
}

.page-about .about-rail::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 6px;
  bottom: 20px;
  width: 1px;
  background: linear-gradient(
    180deg,
    rgba(201, 162, 39, 0) 0%,
    rgba(201, 162, 39, 0.5) 3%,
    rgba(201, 162, 39, 0.5) 95%,
    rgba(201, 162, 39, 0) 100%
  );
}

.page-about .about-sec {
  position: relative;
  padding: 44px 0 6px;
}

.page-about .about-sec::before {
  content: "";
  position: absolute;
  left: -20px;
  top: 48px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--sx-cream);
  border: 1px solid var(--sx-gold);
  box-shadow: 0 0 0 3px var(--sx-cream);
  z-index: 1;
}

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

.page-about .about-hero::before {
  top: 30px;
  background: var(--sx-red);
  border-color: var(--sx-red);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero__title {
  font-family: var(--sx-serif);
  font-weight: 700;
  font-size: clamp(30px, 7.4vw, 56px);
  line-height: 1.16;
  letter-spacing: -0.005em;
  margin: 16px 0 20px;
  max-width: 17em;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 660px;
  font-size: 17px;
  line-height: 1.78;
}

.page-about .about-figures {
  display: grid;
  gap: 0;
  margin-top: 34px;
  border-top: 1px solid var(--sx-line-strong);
}

.page-about .about-figure {
  padding: 18px 0 16px;
  border-bottom: 1px solid var(--sx-line);
}

.page-about .about-figure__num {
  display: block;
  font-family: var(--sx-sans);
  font-weight: 700;
  font-size: 40px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--sx-red);
  font-variant-numeric: tabular-nums;
}

.page-about .about-figure__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--sx-gray);
}

/* ---------- 适用人群 ---------- */
.page-about .about-who__list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .about-who__item {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 12px;
  padding: 22px 0;
  border-bottom: 1px solid var(--sx-line);
}

.page-about .about-who__num {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--sx-gold);
  padding-top: 5px;
  font-variant-numeric: tabular-nums;
}

.page-about .about-who__title {
  font-family: var(--sx-serif);
  font-size: 19px;
  line-height: 1.5;
  margin: 0 0 8px;
}

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

/* ---------- 内容体系 ---------- */
.page-about .about-panel {
  border-radius: var(--sx-r-lg);
  padding: 28px 20px 30px;
  background: var(--sx-celadon-soft);
}

.page-about .about-system__text {
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--sx-ink);
}

.page-about .about-system__grid {
  display: grid;
  gap: 26px;
}

.page-about .about-parts {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-parts__item {
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 10px;
  padding: 14px 0;
  border-bottom: 1px dashed rgba(31, 95, 85, 0.28);
}

.page-about .about-parts__item:first-child {
  border-top: 1px dashed rgba(31, 95, 85, 0.28);
}

.page-about .about-parts__num {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--sx-celadon);
  padding-top: 4px;
  font-variant-numeric: tabular-nums;
}

.page-about .about-parts__name {
  font-family: var(--sx-serif);
  font-size: 17px;
  line-height: 1.5;
  margin: 0 0 4px;
}

.page-about .about-parts__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--sx-gray);
}

.page-about .about-system__fig {
  margin: 0;
}

.page-about .about-cats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid rgba(31, 95, 85, 0.2);
}

.page-about .about-cats .sx-chip {
  background: rgba(251, 247, 242, 0.9);
  border-color: rgba(31, 95, 85, 0.22);
  color: var(--sx-celadon);
}

/* ---------- 团队 ---------- */
.page-about .about-team__fig {
  margin: 0 0 32px;
}

.page-about .about-roles {
  margin-top: 30px;
}

.page-about .about-roles__bar {
  display: flex;
  height: 14px;
  border-radius: var(--sx-pill);
  overflow: hidden;
  background: rgba(22, 23, 27, 0.07);
}

.page-about .about-roles__seg {
  display: block;
  height: 100%;
}

.page-about .about-roles__seg--a {
  flex: 6 1 0;
  background: var(--sx-red);
}

.page-about .about-roles__seg--b {
  flex: 5 1 0;
  background: var(--sx-celadon);
}

.page-about .about-roles__seg--c {
  flex: 3 1 0;
  background: var(--sx-gold);
}

.page-about .about-roles__legend {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-roles__legend li {
  display: grid;
  grid-template-columns: 12px 1fr;
  gap: 10px;
  align-items: start;
  font-size: 14px;
  line-height: 1.6;
}

.page-about .about-roles__dot {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  margin-top: 5px;
}

.page-about .about-roles__legend li:nth-child(1) .about-roles__dot {
  background: var(--sx-red);
}

.page-about .about-roles__legend li:nth-child(2) .about-roles__dot {
  background: var(--sx-celadon);
}

.page-about .about-roles__legend li:nth-child(3) .about-roles__dot {
  background: var(--sx-gold);
}

.page-about .about-duties {
  margin-top: 32px;
}

.page-about .about-duties .sx-accordion__trigger {
  font-family: var(--sx-serif);
  font-size: 17px;
  line-height: 1.5;
}

/* ---------- 运营历程 ---------- */
.page-about .about-history__top {
  display: grid;
  gap: 24px;
}

.page-about .about-history__fig {
  margin: 0;
}

.page-about .about-track {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-track__item {
  position: relative;
  padding: 0 0 26px 22px;
}

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 26px;
  bottom: 0;
  width: 1px;
  background: rgba(201, 162, 39, 0.45);
}

.page-about .about-track__item:last-child {
  padding-bottom: 4px;
}

.page-about .about-track__item:last-child::before {
  display: none;
}

.page-about .about-track__dot {
  position: absolute;
  left: 0;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--sx-red);
  box-shadow: 0 0 0 3px var(--sx-cream), 0 0 0 4px rgba(201, 162, 39, 0.5);
}

.page-about .about-track__year {
  display: block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--sx-gold);
  font-variant-numeric: tabular-nums;
}

.page-about .about-track__title {
  font-family: var(--sx-serif);
  font-size: 18px;
  line-height: 1.5;
  margin: 6px 0 8px;
}

.page-about .about-track__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--sx-gray);
}

/* ---------- 反馈去向 ---------- */
.page-about .about-feedback__panel {
  border-radius: var(--sx-r-lg);
  padding: 30px 22px 32px;
  background-color: var(--sx-ink);
  background-image: radial-gradient(120% 100% at 100% 0%, rgba(193, 39, 45, 0.42), rgba(193, 39, 45, 0) 62%);
  color: var(--sx-cream);
}

.page-about .about-feedback__panel .sx-eyebrow {
  color: var(--sx-gold-soft);
}

.page-about .about-feedback__title {
  font-family: var(--sx-serif);
  font-weight: 700;
  font-size: clamp(24px, 4.6vw, 36px);
  line-height: 1.3;
  margin: 12px 0 16px;
  color: var(--sx-cream);
}

.page-about .about-feedback__lead {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(251, 247, 242, 0.78);
}

.page-about .about-gauge {
  height: 12px;
  border-radius: var(--sx-pill);
  background: rgba(251, 247, 242, 0.16);
  overflow: hidden;
  margin: 28px 0 12px;
}

.page-about .about-gauge__fill {
  display: block;
  width: 30%;
  height: 100%;
  border-radius: var(--sx-pill);
  background: linear-gradient(90deg, var(--sx-red), var(--sx-gold));
}

.page-about .about-gauge__cap {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: rgba(251, 247, 242, 0.62);
}

.page-about .about-feedback__meta {
  margin: 22px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(251, 247, 242, 0.78);
}

.page-about .about-feedback__link {
  color: var(--sx-gold-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(235, 217, 163, 0.6);
  padding-bottom: 1px;
}

.page-about .about-feedback__link:hover,
.page-about .about-feedback__link:focus-visible {
  color: var(--sx-cream);
  border-bottom-color: var(--sx-cream);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-next {
  padding-bottom: 48px;
}

.page-about .about-next__actions {
  display: grid;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-next__actions .sx-btn {
  text-align: center;
}

.page-about .about-next__note {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--sx-gray);
}

.page-about .about-next__note a {
  color: var(--sx-red);
  text-decoration: none;
  border-bottom: 1px solid rgba(193, 39, 45, 0.4);
}

.page-about .about-next__note a:hover,
.page-about .about-next__note a:focus-visible {
  border-bottom-color: var(--sx-red);
}

/* ---------- 图片容器 ---------- */
.page-about .sx-figure__img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--sx-r-md);
}

/* ---------- 桌面端 ---------- */
@media (min-width: 700px) {
  .page-about .about-figures {
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
  }

  .page-about .about-figure {
    padding-right: 22px;
  }

  .page-about .about-figure:last-child {
    padding-right: 0;
  }

  .page-about .about-roles__legend {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  .page-about .about-next__actions {
    grid-template-columns: max-content max-content;
    gap: 14px;
  }

  .page-about .about-next__actions .sx-btn {
    padding-left: 28px;
    padding-right: 28px;
  }
}

@media (min-width: 900px) {
  .page-about {
    padding-bottom: 96px;
  }

  .page-about .about-rail {
    padding-left: 56px;
  }

  .page-about .about-rail::before {
    left: 20px;
  }

  .page-about .about-sec {
    padding: 60px 0 8px;
  }

  .page-about .about-sec::before {
    left: -42px;
    top: 62px;
    width: 13px;
    height: 13px;
  }

  .page-about .about-hero {
    padding-top: 34px;
  }

  .page-about .about-hero::before {
    top: 42px;
  }

  .page-about .about-figure__num {
    font-size: 56px;
  }

  .page-about .about-who__list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-top: 32px;
  }

  .page-about .about-who__item {
    grid-template-columns: 1fr;
    gap: 0;
    padding: 20px 0 0;
    border-bottom: none;
    border-top: 2px solid var(--sx-red);
  }

  .page-about .about-who__num {
    display: block;
    padding-top: 0;
    margin-bottom: 10px;
  }

  .page-about .about-panel {
    padding: 40px 38px 42px;
  }

  .page-about .about-system__grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 44px;
    align-items: start;
  }

  .page-about .about-history__top {
    grid-template-columns: 1fr 1fr;
    gap: 44px;
    align-items: center;
  }

  .page-about .about-history__top .sx-section__head {
    margin-bottom: 0;
  }

  .page-about .about-track {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
    padding-top: 30px;
    margin-top: 40px;
  }

  .page-about .about-track::before {
    content: "";
    position: absolute;
    left: 4px;
    right: 4px;
    top: 8px;
    height: 1px;
    background: rgba(201, 162, 39, 0.5);
  }

  .page-about .about-track__item {
    padding: 0;
  }

  .page-about .about-track__item::before {
    display: none;
  }

  .page-about .about-track__dot {
    top: -26px;
    left: 0;
  }

  .page-about .about-feedback__panel {
    padding: 48px 46px 50px;
  }

  .page-about .about-feedback__lead {
    max-width: 640px;
  }

  .page-about .about-gauge {
    max-width: 620px;
    margin-top: 34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
    animation: none !important;
  }
}