.page-about {
  --about-line: rgba(110, 122, 133, .3);
  --about-line-soft: rgba(110, 122, 133, .15);
  --about-rail-w: 208px;
  --about-tl-pad: clamp(22px, 4vw, 40px);
  color: var(--fog);
}

/* ---------- 首屏 ---------- */
.page-about .about-intro {
  position: relative;
  padding: clamp(28px, 5vw, 64px) 0 clamp(44px, 6vw, 88px);
  background:
    radial-gradient(120% 88% at 2% -14%, rgba(255, 74, 23, .28), transparent 56%),
    radial-gradient(78% 70% at 104% 2%, rgba(56, 242, 176, .09), transparent 62%);
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-intro .breadcrumb {
  margin-bottom: clamp(26px, 4vw, 54px);
}

.page-about .about-intro .eyebrow {
  display: block;
  margin: 0 0 16px;
}

.page-about .about-intro h1 {
  margin: 0;
  max-width: 15em;
  color: var(--fog);
}

.page-about .about-intro .lede {
  margin: 22px 0 0;
  max-width: 36ch;
  color: rgba(232, 226, 216, .76);
}

.page-about .about-intro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(26px, 3.4vw, 40px);
}

.page-about .about-intro__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4vw, 48px);
  align-items: end;
}

.page-about .about-facts {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line-soft);
  border: 1px solid var(--about-line);
}

.page-about .about-facts > div {
  padding: clamp(14px, 2vw, 20px) clamp(14px, 1.8vw, 18px);
  background: rgba(20, 16, 14, .72);
}

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

.page-about .about-facts dd {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .01em;
  color: var(--fox);
}

.page-about .about-facts dd small {
  display: block;
  margin-top: 8px;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: .02em;
  color: rgba(232, 226, 216, .6);
}

@media (min-width: 900px) {
  .page-about .about-intro__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 80px);
  }
}

/* ---------- 左侧栏 + 主体 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(34px, 5vw, 76px);
  padding: clamp(48px, 7vw, 104px) 0 clamp(56px, 7vw, 110px);
}

.page-about .about-rail {
  display: none;
}

.page-about .about-rail__title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--mist);
}

.page-about .about-rail__scale {
  list-style: none;
  margin: 0 0 34px;
  padding: 0 0 0 18px;
  border-left: 1px solid var(--about-line);
}

.page-about .about-rail__scale li {
  position: relative;
  padding: 0 0 15px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.45;
  color: var(--mist);
}

.page-about .about-rail__scale li::before {
  content: "";
  position: absolute;
  left: -22.5px;
  top: 5px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--slate);
  border: 1px solid var(--about-line);
}

.page-about .about-rail__scale li.is-live {
  color: var(--fox);
}

.page-about .about-rail__scale li.is-live::before {
  left: -23.5px;
  top: 3.5px;
  width: 9px;
  height: 9px;
  background: var(--fox);
  border-color: rgba(255, 74, 23, .4);
  box-shadow: 0 0 0 4px rgba(255, 74, 23, .14);
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
  }

  .page-about .about-rail {
    display: block;
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: 96px;
    max-width: 100%;
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-body > .about-section + .about-section {
  margin-top: clamp(58px, 7vw, 104px);
}

.page-about .about-section + .about-section::before {
  content: "";
  display: block;
  height: 12px;
  margin-bottom: clamp(36px, 5vw, 66px);
  background-image: radial-gradient(rgba(110, 122, 133, .55) 1px, transparent 1.2px);
  background-size: 7px 7px;
  opacity: .5;
}

.page-about .about-section__head {
  margin-bottom: clamp(28px, 3.8vw, 48px);
}

.page-about .about-section__idx {
  display: block;
  font-family: var(--font-head);
  font-size: clamp(52px, 9vw, 110px);
  font-weight: 900;
  line-height: .84;
  letter-spacing: -.05em;
  color: rgba(255, 74, 23, .2);
  margin-bottom: 4px;
}

.page-about .about-section h2.t-section {
  margin: 0;
  max-width: 20em;
  color: var(--fog);
}

@media (min-width: 720px) {
  .page-about .about-section__head {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: clamp(16px, 2.4vw, 30px);
    align-items: end;
  }

  .page-about .about-section__idx {
    margin-bottom: 0;
  }
}

.page-about .about-section .copy {
  color: rgba(232, 226, 216, .72);
}

.page-about .about-section h3.t-sub {
  color: var(--fog);
}

/* ---------- 01 三条内容线 ---------- */
.page-about .about-lines {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 3.4vw, 40px);
}

.page-about .about-line {
  padding-top: 18px;
  border-top: 2px solid var(--fox);
}

.page-about .about-line:nth-child(2) {
  border-top-color: var(--amber);
}

.page-about .about-line:nth-child(3) {
  border-top-color: var(--mint);
}

.page-about .about-line__idx {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--mist);
}

.page-about .about-line h3 {
  margin: 0 0 10px;
}

.page-about .about-line p {
  margin: 0;
}

@media (min-width: 820px) {
  .page-about .about-lines {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(20px, 2.4vw, 34px);
  }
}

/* ---------- 02 时间线 ---------- */
.page-about .about-banner {
  margin: 0 0 clamp(32px, 4vw, 54px);
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 4px 0 4px var(--about-tl-pad);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--fox) 0%, rgba(255, 74, 23, .4) 42%, var(--about-line) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: clamp(28px, 3.6vw, 46px);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--about-tl-pad) - 4px);
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--mist);
  transition: border-color .22s ease, transform .22s ease, box-shadow .22s ease;
}

.page-about .about-timeline__item:hover::before {
  border-color: var(--fox);
  transform: scale(1.3);
  box-shadow: 0 0 0 4px rgba(255, 74, 23, .16);
}

.page-about .about-timeline__tag {
  display: inline-block;
  margin: 0 0 10px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--amber);
  border: 1px solid rgba(242, 176, 61, .42);
  transition: background-color .2s ease, color .2s ease;
}

.page-about .about-timeline__item:hover .about-timeline__tag {
  background: var(--amber);
  color: var(--ink);
}

.page-about .about-timeline__item h3 {
  margin: 0 0 8px;
}

.page-about .about-timeline__item p.copy {
  margin: 0;
  max-width: 36ch;
}

.page-about .about-timeline__sum {
  margin: clamp(26px, 3.4vw, 42px) 0 0;
  padding-left: 16px;
  border-left: 3px solid var(--fox);
  font-size: 15px;
  line-height: 1.7;
  color: rgba(232, 226, 216, .84);
}

/* ---------- 03 团队分工 ---------- */
.page-about .about-team {
  align-items: start;
  gap: clamp(28px, 4vw, 54px);
}

.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(20px, 2.6vw, 30px);
}

.page-about .about-team__list li {
  padding-left: 16px;
  border-left: 2px solid var(--fox);
}

.page-about .about-team__list li:nth-child(2) {
  border-left-color: var(--amber);
}

.page-about .about-team__list li:nth-child(3) {
  border-left-color: var(--mint);
}

.page-about .about-team__list h3 {
  margin: 0 0 8px;
}

.page-about .about-team__list p {
  margin: 0;
}

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

.page-about .about-team__note {
  margin: clamp(26px, 3.4vw, 42px) 0 0;
  padding: clamp(18px, 2.4vw, 26px) clamp(18px, 2.6vw, 30px);
  border-left: 3px solid var(--fox);
  background: linear-gradient(90deg, rgba(255, 74, 23, .1), rgba(255, 74, 23, 0) 78%);
  font-size: 15px;
  line-height: 1.78;
  color: rgba(232, 226, 216, .82);
}

/* ---------- 04 处理节奏 ---------- */
.page-about .about-rhythm-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 50px);
  align-items: start;
}

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

.page-about .about-rhythm__step {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: clamp(16px, 2vw, 22px) 0;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-rhythm__step:first-child {
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-rhythm__time {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--fox);
}

.page-about .about-rhythm__step h3 {
  margin: 0 0 6px;
}

.page-about .about-rhythm__step p.copy {
  margin: 0;
}

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

@media (min-width: 720px) {
  .page-about .about-rhythm__step {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

@media (min-width: 1040px) {
  .page-about .about-rhythm-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  }
}

/* ---------- 05 共建伙伴 ---------- */
.page-about .about-partners__lead {
  margin: 0 0 clamp(26px, 3.4vw, 42px);
  max-width: 40ch;
}

.page-about .about-partners {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 2.8vw, 34px);
}

.page-about .about-partners li {
  padding: clamp(18px, 2.4vw, 26px);
  border: 1px solid var(--about-line);
  background: rgba(42, 46, 51, .42);
}

.page-about .about-partners__tag {
  display: inline-block;
  margin-bottom: 12px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--ink);
  background: var(--mint);
}

.page-about .about-partners li:nth-child(2) .about-partners__tag {
  background: var(--amber);
}

.page-about .about-partners li:nth-child(3) .about-partners__tag {
  background: var(--fox);
  color: var(--paper);
}

.page-about .about-partners h3 {
  margin: 0 0 8px;
}

.page-about .about-partners p {
  margin: 0;
}

@media (min-width: 820px) {
  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 06 数字一览 ---------- */
.page-about .about-numbers {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line-soft);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-numbers li {
  padding: clamp(18px, 2.4vw, 28px) clamp(14px, 2vw, 22px);
  background: rgba(20, 16, 14, .55);
}

.page-about .about-numbers__v {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.4vw, 52px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--fox);
}

.page-about .about-numbers li:nth-child(even) .about-numbers__v {
  color: var(--fog);
}

.page-about .about-numbers__k {
  display: block;
  margin-top: 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--fog);
}

.page-about .about-numbers__d {
  display: block;
  margin-top: 5px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .about-numbers__foot {
  margin: clamp(22px, 3vw, 34px) 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
}

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

/* ---------- 尾部入口 ---------- */
.page-about .about-cta {
  padding: clamp(48px, 6vw, 88px) 0 clamp(56px, 7vw, 104px);
  background:
    radial-gradient(80% 120% at 100% 100%, rgba(255, 74, 23, .18), transparent 62%),
    var(--slate);
  border-top: 1px solid rgba(255, 74, 23, .34);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about .about-cta__lead .eyebrow {
  display: block;
  margin: 0 0 14px;
}

.page-about .about-cta__lead h2 {
  margin: 0;
  max-width: 18em;
  color: var(--fog);
}

.page-about .about-cta__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line-soft);
  border: 1px solid var(--about-line);
}

.page-about .about-cta__links a {
  display: block;
  padding: 15px 18px;
  background: var(--ink);
  font-size: 14.5px;
  line-height: 1.55;
  color: rgba(232, 226, 216, .8);
  text-decoration: none;
  transition: background-color .2s ease, color .2s ease, padding-left .2s ease;
}

.page-about .about-cta__links a span {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--fox);
}

.page-about .about-cta__links a:hover,
.page-about .about-cta__links a:focus-visible {
  background: #1d1815;
  color: var(--fog);
  padding-left: 24px;
}

@media (min-width: 880px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  }
}

/* ---------- 窄屏兜底 ---------- */
@media (max-width: 479px) {
  .page-about .about-facts {
    grid-template-columns: minmax(0, 1fr);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item::before,
  .page-about .about-timeline__tag,
  .page-about .about-cta__links a {
    transition: none;
  }
}