.page-about {
  --about-rail: clamp(198px, 21vw, 284px);
  --about-gap: clamp(28px, 4vw, 60px);
  --about-line: rgba(23, 230, 200, .35);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4.6vw, 62px) 0 clamp(46px, 7vw, 96px);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -32%;
  right: -12%;
  width: min(760px, 78vw);
  height: min(760px, 78vw);
  background: radial-gradient(closest-side, rgba(255, 77, 28, .30), rgba(255, 77, 28, 0) 72%);
  pointer-events: none;
}
.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 56px);
  align-items: center;
}
.page-about .about-hero__copy > * + * {
  margin-top: clamp(14px, 1.6vw, 22px);
}
.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6.2vw, 72px);
  line-height: 1.08;
  letter-spacing: -.01em;
  margin: 0;
  color: var(--warm);
}
.page-about .about-hero__lead {
  max-width: 46ch;
  margin: 0;
  font-size: clamp(16px, 1.35vw, 18px);
  line-height: 1.8;
  color: rgba(255, 246, 239, .82);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 6px;
}
.page-about .about-hero__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  border-radius: var(--radius-glass);
  overflow: hidden;
  border: 1px solid var(--glass-line);
  background: var(--glass);
  backdrop-filter: blur(8px);
  box-shadow: 0 26px 60px -28px rgba(5, 10, 31, .9);
}
.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}
.page-about .about-hero__figure .fx-media__caption {
  padding: 12px 16px 14px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(255, 246, 239, .68);
  margin: 0;
}
.page-about .about-hero__streak {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--flare) 0%, var(--gold) 42%, var(--cyan) 100%);
  opacity: .9;
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 4.5vw, 68px);
  padding-top: clamp(40px, 6vw, 84px);
  padding-bottom: clamp(48px, 7vw, 104px);
}

/* ---------- 左栏：年份与章节 ---------- */
.page-about .about-rail__inner {
  display: flex;
  flex-direction: column;
  gap: clamp(22px, 2.6vw, 34px);
}
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 20px;
  position: relative;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--flare), var(--gold) 45%, var(--cyan));
  opacity: .55;
}
.page-about .about-timeline__item {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 9px 0;
}
.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -20px;
  top: 15px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--night);
  border: 2px solid var(--cyan);
}
.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .06em;
  color: var(--gold);
  font-weight: 700;
}
.page-about .about-timeline__note {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(255, 246, 239, .66);
}
.page-about .about-rail__nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-top: 6px;
  border-top: 1px solid var(--line-dark);
}
.page-about .about-rail__nav a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 0;
  font-size: 14px;
  color: rgba(255, 246, 239, .78);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, .06);
  transition: color .2s ease, padding-left .2s ease;
}
.page-about .about-rail__nav a span {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
  letter-spacing: .04em;
}
.page-about .about-rail__nav a:hover,
.page-about .about-rail__nav a:focus-visible {
  color: var(--flare);
  padding-left: 4px;
}

/* 左栏在深色语境下用暖白字，浅色语境下切换 */
.page-about .about-rail {
  color: var(--warm);
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  scroll-margin-top: calc(var(--header-h) + 24px);
}
.page-about .about-chapter + .about-chapter {
  margin-top: clamp(40px, 6vw, 88px);
}
.page-about .about-chapter__head {
  margin-bottom: clamp(20px, 2.6vw, 32px);
}
.page-about .about-chapter__kicker {
  margin: 14px 0 0;
  max-width: 58ch;
  font-size: clamp(14px, 1.15vw, 16px);
  line-height: 1.75;
  color: var(--graphite);
  opacity: .82;
}
.page-about .about-chapter__body p {
  margin: 0 0 16px;
}
.page-about .about-chapter__link {
  margin: 24px 0 0;
}

/* 章节标题字号收紧，避免与首屏争夺 */
.page-about .about-chapter .fx-chapter__title {
  font-size: clamp(24px, 3.1vw, 38px);
  max-width: 24ch;
}

/* ---------- 01 对照 ---------- */
.page-about .about-compare {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(22px, 3vw, 34px);
}
.page-about .about-compare__side {
  padding: 20px 22px;
  border-radius: var(--radius-solid);
}
.page-about .about-compare__side--old {
  background: rgba(31, 37, 51, .06);
  border: 1px dashed rgba(31, 37, 51, .22);
}
.page-about .about-compare__side--new {
  background: linear-gradient(135deg, rgba(255, 77, 28, .10), rgba(23, 230, 200, .12));
  border: 1px solid rgba(255, 77, 28, .32);
}
.page-about .about-compare__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--flare-deep);
}
.page-about .about-compare__side--old .about-compare__label {
  color: var(--graphite);
  opacity: .6;
}
.page-about .about-compare__list {
  margin: 0;
  padding-left: 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--graphite);
}
.page-about .about-compare__arrow {
  display: none;
  align-self: center;
  width: 26px;
  height: 2px;
  background: linear-gradient(90deg, var(--flare), var(--cyan));
  border-radius: 2px;
  position: relative;
}
.page-about .about-compare__arrow::after {
  content: "";
  position: absolute;
  right: -1px;
  top: -3px;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  transform: rotate(-45deg);
}

/* ---------- 02 受众 ---------- */
.page-about .about-audience {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 36px);
  align-items: start;
}
.page-about .about-audience__figure {
  margin: 0;
  border-radius: var(--radius-solid);
  overflow: hidden;
  background: var(--void);
}
.page-about .about-audience__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}
.page-about .about-audience__figure .fx-media__caption {
  margin: 0;
  padding: 10px 14px 12px;
  font-size: 13px;
  color: rgba(255, 246, 239, .7);
}
.page-about .about-scenes {
  margin-top: clamp(22px, 3vw, 34px);
}
.page-about .about-scene {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.page-about .about-scene__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--flare);
}
.page-about .about-scene h3 {
  margin: 0;
  font-size: 18px;
  line-height: 1.4;
}
.page-about .about-scene p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--graphite);
  opacity: .86;
}

/* ---------- 03 数据 ---------- */
.page-about .about-chapter--data {
  padding: clamp(24px, 3.4vw, 40px);
  border-radius: var(--radius-glass);
  background: linear-gradient(160deg, rgba(11, 20, 55, .96), rgba(5, 10, 31, .98));
  border: 1px solid rgba(23, 230, 200, .18);
  color: var(--warm);
}
.page-about .about-chapter--data .fx-chapter__title,
.page-about .about-chapter--data .fx-chapter__no {
  color: var(--warm);
}
.page-about .about-chapter--data .about-chapter__kicker {
  color: rgba(255, 246, 239, .74);
  opacity: 1;
}
.page-about .about-chapter--data .about-chapter__body p {
  color: rgba(255, 246, 239, .84);
}
.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: clamp(20px, 3vw, 30px);
}
.page-about .about-metric {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 18px;
  border-radius: var(--radius-solid);
  background: rgba(255, 255, 255, .06);
  border-left: 3px solid var(--gold);
}
.page-about .about-metric .fx-stat__num {
  font-family: var(--font-num);
  font-size: clamp(24px, 3.2vw, 36px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--gold);
}
.page-about .about-metric .fx-stat__label {
  font-size: 13px;
  line-height: 1.55;
  color: rgba(255, 246, 239, .74);
}
.page-about .about-datatrack {
  margin: 0 0 clamp(20px, 3vw, 30px);
  border-radius: var(--radius-solid);
  overflow: hidden;
  border: 1px solid var(--glass-line);
}
.page-about .about-datatrack img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}
.page-about .about-datatrack .fx-media__caption {
  margin: 0;
  padding: 10px 14px 12px;
  font-size: 13px;
  color: rgba(255, 246, 239, .68);
  background: rgba(255, 255, 255, .04);
}
.page-about .about-data-notes {
  margin-bottom: clamp(20px, 3vw, 30px);
}
.page-about .about-team {
  gap: 14px;
}
.page-about .about-team__card {
  padding: 20px 22px;
}
.page-about .about-team__num {
  margin: 0 0 6px;
  font-family: var(--font-num);
  font-size: 32px;
  font-weight: 700;
  color: var(--cyan);
  line-height: 1;
}
.page-about .about-team__card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  color: var(--warm);
}
.page-about .about-team__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(255, 246, 239, .76);
}

/* ---------- 04 跟队 ---------- */
.page-about .about-follow {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.2vw, 40px);
  align-items: start;
}
.page-about .about-follow__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
  counter-reset: none;
}
.page-about .about-follow__step {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 16px;
  padding: 18px 4px 18px 0;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .about-follow__step:first-child {
  border-top: 1px solid var(--line-soft);
}
.page-about .about-follow__idx {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .08em;
  color: var(--flare);
  padding-top: 3px;
}
.page-about .about-follow__step h3 {
  margin: 0 0 6px;
  font-size: 17px;
  line-height: 1.45;
  color: var(--graphite);
}
.page-about .about-follow__step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--graphite);
  opacity: .84;
}
.page-about .about-follow__aside {
  padding: 24px 24px 26px;
  border-radius: var(--radius-glass);
  background: linear-gradient(150deg, rgba(255, 77, 28, .92), rgba(217, 46, 18, .94));
  color: var(--warm);
  box-shadow: 0 22px 50px -26px rgba(217, 46, 18, .7);
}
.page-about .about-follow__aside .fx-eyebrow {
  color: rgba(255, 246, 239, .92);
}
.page-about .about-follow__big {
  margin: 10px 0 6px;
  font-family: var(--font-num);
  font-size: clamp(46px, 6vw, 68px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
}
.page-about .about-follow__big span {
  font-size: 22px;
  margin-left: 4px;
  font-weight: 400;
}
.page-about .about-follow__sub {
  margin: 0 0 20px;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(255, 246, 239, .92);
}
.page-about .about-follow__aside .fx-btn--primary {
  background: var(--void);
  border-color: var(--void);
  color: var(--warm);
}

/* ---------- 05 合作 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.page-about .about-partner {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 22px;
  border-left: 3px solid var(--cyan);
}
.page-about .about-partner__num {
  margin: 0;
  font-family: var(--font-num);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--flare);
  letter-spacing: -.01em;
}
.page-about .about-partner h3 {
  margin: 0;
  font-size: 16px;
  line-height: 1.5;
  color: var(--graphite);
}
.page-about .about-partner p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--graphite);
  opacity: .84;
}
.page-about .about-survey {
  margin-top: clamp(22px, 3vw, 32px);
  padding: clamp(20px, 2.6vw, 28px);
  border-radius: var(--radius-glass);
  background: rgba(168, 255, 240, .28);
  border: 1px solid rgba(23, 230, 200, .34);
}
.page-about .about-survey__text {
  margin: 10px 0 14px;
  font-size: clamp(15px, 1.3vw, 17px);
  line-height: 1.78;
  color: var(--graphite);
  max-width: 62ch;
}
.page-about .about-survey__link {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  font-size: 14px;
}
.page-about .about-survey__link a {
  color: var(--flare-deep);
  text-decoration: underline;
  text-underline-offset: 4px;
  font-weight: 700;
}
.page-about .about-survey__link a:hover,
.page-about .about-survey__link a:focus-visible {
  color: var(--cyan);
}

/* ---------- 06 主张 ---------- */
.page-about .about-chapter--promise {
  padding: clamp(26px, 4vw, 48px) clamp(22px, 3.4vw, 44px);
  border-radius: var(--radius-glass);
  background: linear-gradient(120deg, rgba(11, 20, 55, .97), rgba(5, 10, 31, .99));
  border: 1px solid rgba(255, 194, 75, .24);
  position: relative;
  overflow: hidden;
}
.page-about .about-chapter--promise::after {
  content: "";
  position: absolute;
  left: -10%;
  bottom: -46%;
  width: 62%;
  height: 130%;
  background: radial-gradient(closest-side, rgba(255, 77, 28, .30), rgba(255, 77, 28, 0) 70%);
  pointer-events: none;
}
.page-about .about-promise {
  position: relative;
  z-index: 1;
}
.page-about .about-promise .fx-chapter__title {
  color: var(--warm);
  max-width: 22ch;
}
.page-about .about-promise .fx-chapter__no {
  color: var(--gold);
}
.page-about .about-promise__body {
  margin-top: 18px;
  max-width: 62ch;
}
.page-about .about-promise__body p {
  color: rgba(255, 246, 239, .86);
  margin: 0 0 16px;
}
.page-about .about-promise__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-compare {
    grid-template-columns: 1fr 26px 1fr;
    align-items: stretch;
  }
  .page-about .about-compare__arrow {
    display: block;
  }
  .page-about .about-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.12fr 1fr;
  }
  .page-about .about-audience {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }
  .page-about .about-follow {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, .9fr);
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .about-rail__inner {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }
}

@media (min-width: 1200px) {
  .page-about .about-partners {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 480px) {
  .page-about .about-follow__step {
    grid-template-columns: 34px 1fr;
    gap: 10px;
  }
  .page-about .about-metrics {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item,
  .page-about .about-scene,
  .page-about .about-follow__step {
    transition: none;
    transform: none;
  }
}
</main>