.page-about {
  --about-line: rgba(143, 163, 200, .32);
  --about-line-paper: rgba(16, 20, 24, .14);
  --about-pad-x: 20px;
  --about-rail-x: 9px;
  --about-body-indent: 26px;
  --about-block-gap: 56px;
}

/* ---------- 面包屑与首屏 ---------- */

.page-about .about-hero {
  position: relative;
  background: var(--deep);
  padding: 26px 0 64px;
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--orange) 0%, var(--orange) 28%, var(--green) 62%, rgba(0, 230, 118, 0) 100%);
  opacity: .85;
}

.page-about .about-hero__inner {
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--about-pad-x);
}

.page-about .about-hero__crumbs {
  margin-bottom: 26px;
  font-size: .8125rem;
  letter-spacing: .04em;
  color: var(--haze);
}

.page-about .about-hero__crumbs .crumbs__link {
  color: var(--haze);
  text-decoration: none;
}

.page-about .about-hero__crumbs .crumbs__link:hover,
.page-about .about-hero__crumbs .crumbs__link:focus-visible {
  color: var(--orange);
}

.page-about .about-hero__crumbs .crumbs__sep {
  margin-inline: 8px;
  color: rgba(143, 163, 200, .6);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 40px;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 8vw, 3.5rem);
  line-height: 1.02;
  letter-spacing: -.02em;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 34em;
  font-size: 1rem;
  line-height: 1.78;
  color: rgba(245, 247, 250, .82);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 20px 40px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: 1.9rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-fact__unit {
  margin-left: 3px;
  font-size: .8125rem;
  font-weight: 500;
  color: var(--orange-soft);
}

.page-about .about-fact__label {
  font-size: .8125rem;
  letter-spacing: .05em;
  color: var(--haze);
}

.page-about .about-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

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

.page-about .about-hero__figure .figure__media {
  clip-path: var(--cut-18);
  border: 1px solid rgba(143, 163, 200, .22);
}

.page-about .about-hero__figure .figure__caption {
  margin-top: 12px;
  font-size: .8125rem;
  line-height: 1.6;
  color: var(--haze);
}

/* ---------- 章节导航条 ---------- */

.page-about .about-toc {
  position: sticky;
  top: var(--topbar-h);
  z-index: 20;
  background: rgba(6, 21, 48, .94);
  border-bottom: 1px solid var(--about-line);
  backdrop-filter: blur(8px);
}

.page-about .about-toc__inner {
  max-width: var(--shell);
  margin-inline: auto;
  padding: 10px var(--about-pad-x);
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-about .about-toc__label {
  flex: 0 0 auto;
  font-size: .6875rem;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--haze);
}

.page-about .about-toc__list {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-toc__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc__link {
  display: block;
  flex: 0 0 auto;
  padding: 7px 12px;
  font-family: var(--font-body);
  font-size: .8125rem;
  font-weight: 500;
  line-height: 1.3;
  color: var(--haze);
  text-decoration: none;
  white-space: nowrap;
  clip-path: var(--cut-8);
  background: rgba(18, 58, 122, .35);
  border: 1px solid transparent;
  transition: color .22s var(--ease), background-color .22s var(--ease), border-color .22s var(--ease);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--paper);
  background: rgba(18, 58, 122, .7);
}

.page-about .about-toc__link[aria-current="true"] {
  color: var(--ink);
  background: var(--orange);
  border-color: var(--orange);
}

/* ---------- 章节基础 ---------- */

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

.page-about .about-chapter {
  position: relative;
  background: var(--night);
  color: var(--paper);
}

.page-about .about-chapter--deep {
  background: var(--deep);
}

.page-about .about-chapter--paper {
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-chapter__inner {
  position: relative;
  max-width: var(--shell);
  margin-inline: auto;
  padding: var(--about-block-gap) var(--about-pad-x);
}

.page-about .about-chapter__inner::before {
  content: "";
  position: absolute;
  left: var(--about-rail-x);
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--about-line);
  pointer-events: none;
}

.page-about .about-chapter--paper .about-chapter__inner::before {
  background: var(--about-line-paper);
}

.page-about .about-chapter__inner::after {
  content: "";
  position: absolute;
  left: var(--about-rail-x);
  top: calc(var(--about-block-gap) - 8px);
  width: 11px;
  height: 11px;
  margin-left: -5px;
  background: var(--orange);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
  pointer-events: none;
}

.page-about .about-chapter--deep .about-chapter__inner::after {
  background: var(--green);
}

.page-about .about-chapter__body {
  min-width: 0;
  padding-left: var(--about-body-indent);
}

.page-about .about-chapter__idx {
  display: block;
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 2.6rem;
  font-weight: 700;
  line-height: .9;
  letter-spacing: -.05em;
  color: rgba(143, 163, 200, .26);
  font-variant-numeric: tabular-nums;
}

.page-about .about-chapter--deep .about-chapter__idx {
  color: rgba(124, 240, 184, .24);
}

.page-about .about-chapter--paper .about-chapter__idx {
  color: rgba(16, 20, 24, .12);
}

.page-about .about-chapter .eyebrow {
  margin: 0 0 12px;
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-chapter--paper .eyebrow {
  color: #b0421a;
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 6vw, 2.6rem);
  line-height: 1.06;
  letter-spacing: -.02em;
  color: inherit;
  text-wrap: balance;
}

.page-about .about-chapter__lead {
  margin: 18px 0 0;
  max-width: 40em;
  font-size: 1rem;
  line-height: 1.78;
  color: rgba(245, 247, 250, .8);
}

.page-about .about-chapter--paper .about-chapter__lead {
  color: #333b47;
}

.page-about .about-chapter__tail {
  margin: 26px 0 0;
  max-width: 40em;
  font-size: .9375rem;
  line-height: 1.75;
  color: rgba(245, 247, 250, .74);
}

.page-about .about-link {
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 107, 53, .5);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--orange-soft);
  border-bottom-color: var(--orange-soft);
}

.page-about .about-chapter--paper .about-link {
  color: #b0421a;
  border-bottom-color: rgba(176, 66, 26, .45);
}

/* ---------- 01 团队分工 ---------- */

.page-about .crews {
  margin: 30px 0 0;
  display: grid;
  gap: 0;
}

.page-about .crews__row {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  grid-template-rows: auto auto;
  gap: 4px 0;
  padding: 22px 0;
  border-top: 1px solid var(--about-line);
}

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

.page-about .crews__num {
  grid-row: 1 / 3;
  align-self: start;
  font-family: var(--font-mono);
  font-size: 1.85rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--green);
  font-variant-numeric: tabular-nums;
}

.page-about .crews__name {
  grid-column: 2;
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .crews__desc {
  grid-column: 2;
  margin: 0;
  font-size: .9375rem;
  line-height: 1.72;
  color: rgba(245, 247, 250, .76);
}

/* ---------- 02 三轮校对 ---------- */

.page-about .proof {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
}

.page-about .proof__step {
  position: relative;
  padding: 20px 0 20px 26px;
  border-left: 2px solid var(--about-line-paper);
}

.page-about .proof__step--a {
  border-left-color: var(--orange);
}

.page-about .proof__step--b {
  border-left-color: var(--orange-soft);
}

.page-about .proof__step--c {
  border-left-color: var(--green);
}

.page-about .proof__step::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 26px;
  width: 12px;
  height: 12px;
  clip-path: polygon(0 0, calc(100% - 4px) 0, 100% 4px, 100% 100%, 4px 100%, 0 calc(100% - 4px));
}

.page-about .proof__step--a::before {
  background: var(--orange);
}

.page-about .proof__step--b::before {
  background: var(--orange-soft);
}

.page-about .proof__step--c::before {
  background: var(--green);
}

.page-about .proof__idx {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .12em;
  color: rgba(16, 20, 24, .45);
}

.page-about .proof__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .proof__text {
  margin: 0;
  max-width: 38em;
  font-size: .9375rem;
  line-height: 1.75;
  color: #3a424f;
}

.page-about .proof__note {
  margin-top: 26px;
  padding: 16px 18px;
  background: rgba(255, 107, 53, .08);
  border-left: 3px solid var(--orange);
  clip-path: var(--cut-12);
}

.page-about .proof__note p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.72;
  color: #3a424f;
}

.page-about .proof__figure {
  margin: 32px 0 0;
}

.page-about .proof__figure .figure__media {
  clip-path: var(--cut-18);
  border: 1px solid var(--about-line-paper);
}

.page-about .proof__figure .figure__caption {
  margin-top: 12px;
  font-size: .8125rem;
  line-height: 1.6;
  color: rgba(16, 20, 24, .58);
}

/* ---------- 03 年度薪资 ---------- */

.page-about .salary-chart {
  margin-top: 30px;
  padding: 22px 18px 18px;
  background: rgba(18, 58, 122, .42);
  clip-path: var(--cut-18);
  border: 1px solid rgba(143, 163, 200, .2);
}

.page-about .salary-chart__svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 660px;
  margin-inline: auto;
}

.page-about .salary-chart__keys {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .salary-chart__key {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: .875rem;
  line-height: 1.6;
  color: rgba(245, 247, 250, .8);
}

.page-about .salary-chart__dot {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  transform: translateY(-1px);
  clip-path: polygon(0 0, calc(100% - 3px) 0, 100% 3px, 100% 100%, 3px 100%, 0 calc(100% - 3px));
}

.page-about .salary-chart__dot--a {
  background: var(--orange);
}

.page-about .salary-chart__dot--b {
  background: var(--orange-soft);
}

.page-about .salary-chart__dot--c {
  background: var(--green);
}

.page-about .salary-chart__dot--d {
  background: var(--mint);
}

.page-about .about-salary__more {
  margin-top: 26px;
  border-top: 1px solid var(--about-line);
  padding-top: 18px;
}

.page-about .about-salary__more .disclosure__summary {
  font-size: .9375rem;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--orange);
  cursor: pointer;
}

.page-about .about-salary__more .disclosure__body p {
  margin: 14px 0 0;
  max-width: 40em;
  font-size: .9375rem;
  line-height: 1.75;
  color: rgba(245, 247, 250, .78);
}

/* ---------- 04 每轮节奏 ---------- */

.page-about .rundown {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
}

.page-about .rundown__row {
  padding: 16px 0;
  border-top: 1px dashed rgba(143, 163, 200, .3);
}

.page-about .rundown__row:last-child {
  border-bottom: 1px dashed rgba(143, 163, 200, .3);
}

.page-about .rundown__time {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: .8125rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--green);
  font-variant-numeric: tabular-nums;
}

.page-about .rundown__text {
  margin: 0;
  max-width: 40em;
  font-size: .9375rem;
  line-height: 1.72;
  color: rgba(245, 247, 250, .78);
}

/* ---------- 05 合作生态 ---------- */

.page-about .eco {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 30px;
  background: var(--about-line-paper);
  border: 1px solid var(--about-line-paper);
}

.page-about .eco__stat {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 18px 16px;
  background: var(--paper);
}

.page-about .eco__num {
  font-family: var(--font-mono);
  font-size: 1.7rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: #b0421a;
  font-variant-numeric: tabular-nums;
}

.page-about .eco__label {
  font-size: .8125rem;
  line-height: 1.5;
  color: rgba(16, 20, 24, .62);
}

.page-about .eco__figure {
  margin: 32px 0 0;
}

.page-about .eco__figure .figure__media {
  clip-path: var(--cut-18);
  border: 1px solid var(--about-line-paper);
}

.page-about .eco__figure .figure__caption {
  margin-top: 12px;
  font-size: .8125rem;
  line-height: 1.6;
  color: rgba(16, 20, 24, .58);
}

/* ---------- 06 合作与加入 ---------- */

.page-about .about-chapter--last .about-chapter__inner {
  padding-bottom: 84px;
}

.page-about .join {
  display: grid;
  gap: 28px;
  margin-top: 30px;
}

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

.page-about .join__text {
  margin: 0;
  max-width: 34em;
  font-size: .9375rem;
  line-height: 1.75;
  color: rgba(245, 247, 250, .78);
}

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

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

.page-about .join__contact {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .join__contact .contact-list__row {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  align-items: baseline;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .join__contact .contact-list__k {
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--haze);
}

.page-about .join__contact .contact-list__v {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: .875rem;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.page-about .join__mail {
  word-break: break-all;
}

.page-about .join__contact .copy-btn {
  font-family: var(--font-body);
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--orange);
  background: transparent;
  border: 1px solid rgba(255, 107, 53, .5);
  padding: 3px 9px;
  cursor: pointer;
  clip-path: var(--cut-8);
  transition: background-color .2s var(--ease), color .2s var(--ease);
}

.page-about .join__contact .copy-btn:hover,
.page-about .join__contact .copy-btn:focus-visible {
  background: var(--orange);
  color: var(--ink);
}

.page-about .join__contact .copy-btn.is-done {
  color: var(--ink);
  background: var(--green);
  border-color: var(--green);
}

.page-about .join__note {
  margin: 16px 0 0;
  max-width: 34em;
  font-size: .875rem;
  line-height: 1.7;
  color: rgba(143, 163, 200, .92);
}

/* ---------- 返回顶部 ---------- */

.page-about .about-backtop {
  max-width: var(--shell);
  margin-inline: auto;
  padding: 0 var(--about-pad-x);
  text-align: right;
}

/* ---------- 窄屏到宽屏 ---------- */

@media (min-width: 640px) {
  .page-about {
    --about-pad-x: 32px;
    --about-rail-x: 13px;
    --about-body-indent: 32px;
  }

  .page-about .about-hero__grid {
    gap: 48px;
  }

  .page-about .salary-chart__keys {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 24px;
  }

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

  .page-about .join {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .rundown__row {
    display: grid;
    grid-template-columns: 172px minmax(0, 1fr);
    gap: 0 24px;
    align-items: baseline;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: 34px;
    padding-bottom: 84px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: end;
  }

  .page-about .about-hero__title {
    font-size: clamp(2.6rem, 4.6vw, 3.9rem);
  }

  .page-about .salary-chart {
    padding: 28px 26px 22px;
  }
}

@media (min-width: 1024px) {
  .page-about {
    --about-block-gap: 88px;
  }

  .page-about .about-chapter__inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 0 92px;
    padding-inline: 40px;
  }

  .page-about .about-chapter__inner::before {
    left: 50%;
  }

  .page-about .about-chapter__inner::after {
    left: 50%;
    top: calc(var(--about-block-gap) + 6px);
  }

  .page-about .about-chapter__body {
    padding-left: 0;
  }

  .page-about .about-chapter--left .about-chapter__body {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-chapter--right .about-chapter__body {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-chapter__idx {
    font-size: 3.4rem;
  }

  .page-about .about-chapter__title {
    font-size: clamp(2rem, 3.1vw, 2.9rem);
  }

  .page-about .crews__row {
    grid-template-columns: 72px minmax(0, 1fr);
  }

  .page-about .about-backtop {
    padding-inline: 40px;
  }
}

@media (min-width: 1280px) {
  .page-about .about-chapter__inner {
    gap: 0 120px;
    padding-inline: 56px;
  }

  .page-about .about-chapter__idx {
    font-size: 4rem;
  }

  .page-about .about-hero__inner {
    padding-inline: 56px;
  }

  .page-about .about-backtop {
    padding-inline: 56px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__link,
  .page-about .join__contact .copy-btn {
    transition: none;
  }

  .page-about [data-reveal] {
    transform: none !important;
  }
}