.page-about {
  --pct: 0%;
  background: var(--green-900);
  color: var(--fg);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 44px) 0 clamp(44px, 7vw, 84px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(70% 90% at 88% 6%, rgba(35, 197, 214, 0.18), transparent 62%),
    radial-gradient(58% 78% at 2% 100%, rgba(255, 122, 24, 0.14), transparent 60%),
    var(--green-900);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: clamp(12px, 4vw, 52px);
  width: 2px;
  height: 100%;
  background-image: repeating-linear-gradient(to bottom, var(--orange-soft) 0 2px, transparent 2px 14px);
  opacity: 0.45;
  pointer-events: none;
}

.page-about .breadcrumbs {
  margin-bottom: clamp(18px, 3vw, 32px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--fg-faint);
}

.page-about .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .breadcrumbs__item a {
  color: var(--fg-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .breadcrumbs__item a:hover,
.page-about .breadcrumbs__item a:focus-visible {
  color: var(--marker);
  border-bottom-color: var(--marker);
}

.page-about .breadcrumbs__item [aria-current="page"] {
  color: var(--orange);
}

.page-about .hero-grid {
  display: grid;
  gap: clamp(28px, 5vw, 52px);
  align-items: start;
}

.page-about .hero-title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(33px, 7.2vw, 68px);
  line-height: 1.03;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--paper);
  max-width: 16ch;
}

.page-about .hero-title em {
  font-style: normal;
  color: var(--orange);
}

.page-about .hero-lede {
  margin: 20px 0 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.9vw, 17px);
  line-height: 1.8;
  color: var(--fg-muted);
}

.page-about .hero-facts {
  display: grid;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .hero-fact {
  padding: 14px 18px;
  border-left: 2px solid var(--cyan);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: rgba(244, 241, 232, 0.05);
}

.page-about .hero-fact__v {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.6vw, 32px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--orange);
}

.page-about .hero-fact__k {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--fg-faint);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-section {
  padding: clamp(44px, 7vw, 88px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-section--last {
  border-bottom: 0;
}

.page-about .section__num {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.6vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--orange);
}

.page-about .section__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.18;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
  max-width: 22ch;
}

.page-about .section__lede {
  margin: 16px 0 0;
  max-width: 58ch;
  font-size: clamp(15px, 1.8vw, 17px);
  line-height: 1.78;
  color: var(--fg-muted);
}

.page-about .prose {
  margin-top: clamp(20px, 3vw, 30px);
  max-width: 68ch;
}

.page-about .prose p {
  margin: 0 0 1.1em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--fg-muted);
}

.page-about .prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 时间轴 ---------- */

.page-about .timeline {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
}

.page-about .tl-item {
  position: relative;
  padding-left: 76px;
  padding-bottom: clamp(22px, 3vw, 34px);
  outline: none;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 58px;
  top: 10px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--cyan), rgba(35, 197, 214, 0.16));
}

.page-about .tl-item:last-child::before {
  bottom: auto;
  height: 12px;
}

.page-about .tl-item::after {
  content: "";
  position: absolute;
  left: 54px;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px var(--green-900);
}

.page-about .tl-year {
  position: absolute;
  left: 0;
  top: 3px;
  width: 50px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--fg-muted);
}

.page-about .tl-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.3vw, 23px);
  line-height: 1.3;
  font-weight: 700;
  color: var(--paper);
}

.page-about .tl-body {
  margin: 8px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--fg-muted);
}

.page-about .tl-more {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 15px;
  line-height: 1.75;
  color: var(--fg-faint);
  transition: max-height 320ms var(--ease), opacity 220ms var(--ease), margin-top 320ms var(--ease);
}

.page-about .tl-item:hover .tl-more,
.page-about .tl-item:focus-within .tl-more,
.page-about .tl-item:focus .tl-more {
  max-height: 220px;
  opacity: 1;
  margin-top: 10px;
}

.page-about .tl-item:focus-visible {
  box-shadow: inset 2px 0 0 var(--cyan);
}

/* ---------- 图片 ---------- */

.page-about .about-media {
  margin: clamp(28px, 4vw, 44px) 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--green-800);
  overflow: hidden;
}

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

.page-about .about-media figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  line-height: 1.6;
  color: var(--fg-faint);
}

/* ---------- 纸白分区 ---------- */

.page-about .about-paper {
  --fg: var(--ink);
  --fg-muted: rgba(17, 22, 20, 0.74);
  --fg-faint: rgba(17, 22, 20, 0.52);
  --line: rgba(17, 22, 20, 0.14);
  --line-strong: rgba(17, 22, 20, 0.3);
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-paper .about-section {
  border-bottom: 1px solid rgba(17, 22, 20, 0.14);
}

.page-about .about-paper .about-section--paper:last-child {
  border-bottom: 1px solid rgba(17, 22, 20, 0.14);
}

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

.page-about .about-paper .section__num {
  color: var(--cyan-deep);
}

.page-about .about-paper .about-media {
  background: #e7e3d6;
  border-color: rgba(17, 22, 20, 0.14);
}

.page-about .about-paper .about-media figcaption {
  border-top-color: rgba(17, 22, 20, 0.14);
  color: rgba(17, 22, 20, 0.52);
}

/* ---------- 岗位筛选 ---------- */

.page-about .role-tools {
  margin-top: clamp(24px, 3vw, 36px);
}

.page-about .role-tools__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(17, 22, 20, 0.52);
}

.page-about .role-tools .tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .role-tools .tag {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.03em;
  padding: 7px 13px;
  border: 1px solid rgba(17, 22, 20, 0.22);
  border-radius: 999px;
  background: transparent;
  color: rgba(17, 22, 20, 0.74);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .role-tools .tag:hover {
  border-color: var(--cyan-deep);
  color: var(--cyan-deep);
}

.page-about .role-tools .tag:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.page-about .role-tools .tag[aria-pressed="true"] {
  background: var(--marker);
  border-color: var(--marker);
  color: var(--ink);
}

/* ---------- 岗位卡 ---------- */

.page-about .role-grid {
  display: grid;
  gap: 14px;
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
}

.page-about .role-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 20px 22px;
  background: #fffdf7;
  border: 1px solid rgba(17, 22, 20, 0.14);
  border-radius: var(--radius);
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .role-card:hover {
  transform: translateY(-3px);
  border-color: var(--cyan-deep);
  box-shadow: 0 14px 26px -20px rgba(11, 59, 46, 0.75);
}

.page-about .role-card__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.page-about .role-card__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan-deep);
}

.page-about .role-card__count {
  font-family: var(--font-display);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .role-card__count small {
  margin-left: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  color: rgba(17, 22, 20, 0.52);
}

.page-about .role-card__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .role-card__body {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(17, 22, 20, 0.74);
}

/* ---------- 产能条形 ---------- */

.page-about .bars {
  display: grid;
  gap: 20px;
  margin-top: clamp(24px, 3vw, 36px);
}

.page-about .bar-row {
  display: grid;
  gap: 6px;
}

.page-about .bar-row__label {
  margin: 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .bar-track {
  height: 14px;
  border-radius: 2px;
  background: rgba(17, 22, 20, 0.08);
  overflow: hidden;
}

.page-about .bar-fill {
  display: block;
  height: 100%;
  width: var(--pct);
  border-radius: 2px;
  background: linear-gradient(90deg, var(--cyan-deep), var(--cyan));
  transition: width 620ms var(--ease);
}

.page-about .bar-row__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.03em;
  color: rgba(17, 22, 20, 0.74);
}

.page-about .output-note {
  margin-top: clamp(24px, 3vw, 34px);
  padding-left: 16px;
  border-left: 2px solid var(--orange);
}

.page-about .output-note p {
  color: rgba(17, 22, 20, 0.74);
}

/* ---------- 合作 ---------- */

.page-about .partner-grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  margin-top: clamp(24px, 3vw, 36px);
  align-items: start;
}

.page-about .about-media--flush {
  margin-top: 0;
}

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

.page-about .partner-stat {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

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

.page-about .partner-stat__v {
  font-family: var(--font-display);
  font-size: clamp(24px, 3.2vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .partner-stat__t {
  font-size: 15px;
  line-height: 1.75;
  color: var(--fg-muted);
}

.page-about .partner-note {
  margin: 20px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--fg-muted);
}

.page-about .partner-note a {
  color: var(--marker);
  text-decoration: none;
  border-bottom: 1px solid rgba(216, 243, 74, 0.5);
  transition: border-color var(--dur) var(--ease);
}

.page-about .partner-note a:hover,
.page-about .partner-note a:focus-visible {
  border-bottom-color: var(--marker);
}

/* ---------- 里程碑 ---------- */

.page-about .milestones {
  list-style: none;
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding: 0;
}

.page-about .milestone {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

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

.page-about .milestone__y {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--orange);
}

.page-about .milestone__t {
  font-size: 15px;
  line-height: 1.78;
  color: var(--fg-muted);
}

/* ---------- 底部入口 ---------- */

.page-about .about-cta {
  padding: clamp(44px, 7vw, 84px) 0 clamp(56px, 8vw, 96px);
  background:
    linear-gradient(180deg, rgba(20, 72, 58, 0.85), rgba(11, 59, 46, 1)),
    var(--green-800);
  border-top: 1px solid var(--line);
}

.page-about .about-cta__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-cta__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.18;
  font-weight: 700;
  color: var(--paper);
  max-width: 20ch;
}

.page-about .cta-links {
  display: grid;
  gap: 14px;
  margin-top: clamp(24px, 3vw, 36px);
}

.page-about .cta-link {
  display: grid;
  gap: 6px;
  padding: 20px 20px 22px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: rgba(244, 241, 232, 0.05);
  text-decoration: none;
  transition: transform 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .cta-link:hover,
.page-about .cta-link:focus-visible {
  transform: translateY(-3px);
  border-color: var(--orange);
  background: rgba(255, 122, 24, 0.1);
}

.page-about .cta-link__t {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .cta-link__d {
  font-size: 14px;
  line-height: 1.7;
  color: var(--fg-muted);
}

/* ---------- 响应式 ---------- */

@media (max-width: 719px) {
  .page-about .about-hero::after {
    display: none;
  }
}

@media (min-width: 560px) {
  .page-about .hero-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 700px) {
  .page-about .role-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .bar-row {
    grid-template-columns: 150px minmax(0, 1fr) 128px;
    align-items: center;
    gap: 18px;
  }

  .page-about .bar-row__value {
    text-align: right;
  }
}

@media (min-width: 900px) {
  .page-about .partner-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: center;
  }

  .page-about .cta-links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 920px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }
}

@media (hover: none) {
  .page-about .tl-more {
    max-height: none;
    opacity: 1;
    margin-top: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .role-card,
  .page-about .cta-link,
  .page-about .bar-fill,
  .page-about .tl-more {
    transition: none;
  }
}