.page-about {
  --about-line: 4px;
  --about-gap: clamp(24px, 4vw, 56px);
  --about-pad: clamp(56px, 8vw, 110px);
  font-family: var(--font-sans);
  background: var(--white);
  color: var(--ink);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding: 20px 0 0;
  background: var(--navy);
}

.page-about .breadcrumb-list {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 0 var(--gap);
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.62);
}

.page-about .breadcrumb-list li + li::before {
  content: "/";
  margin-right: 10px;
  color: rgba(255, 255, 255, 0.32);
}

.page-about .breadcrumb-list a {
  color: rgba(255, 255, 255, 0.82);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .breadcrumb-list a:hover,
.page-about .breadcrumb-list a:focus-visible {
  color: var(--grass-bright);
  border-bottom-color: currentColor;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--navy);
  color: var(--white);
  padding: clamp(32px, 5vw, 56px) 0 0;
  overflow: hidden;
}

.page-about .about-hero-inner {
  padding-bottom: clamp(28px, 4vw, 48px);
}

.page-about .about-hero .eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--grass-bright);
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(30px, 5.4vw, 56px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  max-width: 18em;
}

.page-about .about-hero-lead {
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  max-width: 46em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.78);
}

.page-about .about-hero-stats {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: clamp(24px, 4vw, 64px);
}

.page-about .about-hero-stat {
  display: flex;
  flex-direction: column;
  padding-left: 14px;
  border-left: 2px solid var(--amber);
}

.page-about .about-hero-stat-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(32px, 4.4vw, 52px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--amber);
}

.page-about .about-hero-stat-unit {
  margin-left: 6px;
  font-size: 0.4em;
  font-weight: 600;
  letter-spacing: 0;
  color: rgba(255, 255, 255, 0.68);
}

.page-about .about-hero-stat-label {
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: 0.03em;
  color: rgba(255, 255, 255, 0.66);
}

.page-about .about-hero-media {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 7;
  background: var(--navy-800);
  overflow: hidden;
}

.page-about .about-hero-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.42) contrast(1.06) brightness(0.82);
}

.page-about .about-hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.06) 1px, transparent 1px);
  background-size: 56px 56px;
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding: var(--about-pad) 0;
}

.page-about .about-section .section-head {
  max-width: 40em;
}

.page-about .section-num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(38px, 5.6vw, 82px);
  font-weight: 700;
  line-height: 0.92;
  letter-spacing: -0.04em;
  color: var(--grass);
}

.page-about .section-title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(24px, 3.2vw, 38px);
  line-height: 1.24;
  color: var(--navy);
}

.page-about .section-lead {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .prose p {
  margin: 0 0 1.2em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink);
}

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

/* ---------- 02 合作起点 ---------- */
.page-about .about-origin {
  background: var(--white);
  border-bottom: 1px solid var(--line);
}

.page-about .about-origin-grid {
  display: grid;
  gap: clamp(24px, 3.6vw, 56px);
}

@media (min-width: 900px) {
  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    align-items: start;
  }
}

/* ---------- 03 时间轴 ---------- */
.page-about .about-timeline {
  background: var(--mist);
}

.page-about .about-track {
  position: relative;
  list-style: none;
  margin: clamp(36px, 5vw, 64px) 0 0;
  padding: 0;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 10px;
  width: var(--about-line);
  border-radius: 2px;
  background: linear-gradient(180deg, var(--grass) 0%, var(--navy-800) 100%);
}

.page-about .about-node {
  position: relative;
  padding-left: clamp(30px, 4vw, 48px);
}

.page-about .about-node + .about-node {
  margin-top: clamp(28px, 4vw, 56px);
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 20px;
  height: 20px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--white);
  border: 4px solid var(--grass);
  transition: background-color 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-node:focus-within::before {
  background: var(--grass-bright);
  border-color: var(--navy);
}

.page-about .about-node-mark {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 10px;
}

.page-about .about-node-year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--navy);
}

.page-about .about-node-phase {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-board {
  background: var(--white);
  border-radius: var(--radius);
  padding: clamp(20px, 2.6vw, 32px);
  box-shadow: var(--shadow-1);
  transition: transform 0.28s var(--ease), box-shadow 0.28s var(--ease);
}

.page-about .about-board:focus-visible {
  outline: 2px solid var(--grass);
  outline-offset: 3px;
}

@media (hover: hover) {
  .page-about .about-node:hover .about-board {
    transform: translateY(-3px);
    box-shadow: var(--shadow-2);
  }
}

.page-about .about-board-title {
  margin: 14px 0 10px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(19px, 2vw, 24px);
  line-height: 1.32;
  color: var(--navy);
}

.page-about .about-board-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .about-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin: 18px 0 0;
  padding: 0;
}

.page-about .about-facts > div {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .about-facts dt {
  font-size: 12px;
  color: var(--muted);
}

.page-about .about-facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 18px;
  font-weight: 700;
  color: var(--navy);
}

.page-about .about-board-more {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-about .about-board-more a {
  font-size: 13px;
  font-weight: 600;
  color: var(--grass);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-board-more a:hover,
.page-about .about-board-more a:focus-visible {
  color: var(--orange-ink);
  border-bottom-color: currentColor;
}

@media (min-width: 940px) {
  .page-about .about-node {
    display: grid;
    grid-template-columns: 168px minmax(0, 1fr);
    gap: clamp(20px, 3vw, 44px);
    align-items: start;
    padding-left: clamp(36px, 4vw, 56px);
  }

  .page-about .about-node-mark {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    margin-top: 6px;
    margin-bottom: 0;
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .about-node-year {
    font-size: 15px;
    letter-spacing: 0.04em;
  }
}

/* ---------- 04 记录流程 ---------- */
.page-about .about-flow {
  background: var(--white);
}

.page-about .about-flow-grid {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(32px, 4vw, 56px);
}

@media (min-width: 960px) {
  .page-about .about-flow-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: about-step;
}

.page-about .about-step {
  position: relative;
  padding-left: clamp(48px, 6vw, 64px);
  padding-bottom: 28px;
}

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

.page-about .about-step::before {
  counter-increment: about-step;
  content: counter(about-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 22px;
  font-weight: 700;
  color: var(--grass);
  letter-spacing: -0.02em;
}

.page-about .about-step:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 15px;
  top: 34px;
  bottom: 8px;
  width: 2px;
  background: var(--line);
}

.page-about .about-step-title {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 18px;
  line-height: 1.4;
  color: var(--navy);
}

.page-about .about-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .about-flow-media {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--mist);
}

.page-about .about-flow-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.5) contrast(1.04);
}

.page-about .about-flow-caption {
  display: block;
  padding: 12px 16px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
  background: var(--mist);
}

.page-about .about-fields {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(28px, 3.6vw, 44px);
}

.page-about .about-chip {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0 14px;
  border-radius: 999px;
  background: var(--mist);
  color: var(--navy);
  font-size: 13px;
  letter-spacing: 0.02em;
}

/* ---------- 05 履历档案 ---------- */
.page-about .about-careers {
  background: var(--indigo);
  color: var(--white);
}

.page-about .about-careers .section-num {
  color: var(--amber);
}

.page-about .about-careers .section-title {
  color: var(--white);
}

.page-about .about-careers .section-lead {
  color: rgba(255, 255, 255, 0.7);
}

.page-about .about-career-stats {
  list-style: none;
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(20px, 3vw, 40px);
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.page-about .about-career-stat {
  padding-top: 16px;
  border-top: 3px solid var(--amber);
}

.page-about .about-career-stat-value {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(34px, 5.6vw, 62px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--amber);
}

.page-about .about-career-stat-label {
  display: block;
  margin-top: 12px;
  font-size: 13.5px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.72);
}

.page-about .about-entry-grid {
  display: grid;
  gap: 12px;
  margin-top: clamp(30px, 4vw, 48px);
}

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

.page-about .about-entry {
  padding: 20px;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.06);
  transition: background-color 0.24s var(--ease);
}

.page-about .about-entry:hover {
  background: rgba(63, 169, 111, 0.16);
}

.page-about .about-entry-title {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 17px;
  color: var(--white);
}

.page-about .about-entry p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.72);
}

.page-about .about-careers-note {
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.82);
  border-left: 3px solid var(--grass-bright);
  padding-left: 16px;
}

.page-about .about-events {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(30px, 4vw, 48px);
  padding: 1px;
  background: var(--line-dark);
  border-radius: var(--radius);
  overflow: hidden;
}

@media (min-width: 720px) {
  .page-about .about-events {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-events {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

.page-about .about-event {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 14px;
  background: var(--navy-800);
  transition: background-color 0.2s var(--ease);
}

.page-about .about-event:hover {
  background: var(--grass);
}

.page-about .about-event-idx {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: rgba(255, 255, 255, 0.5);
}

.page-about .about-event-name {
  font-size: 14.5px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--white);
}

/* ---------- 06 译名体系 ---------- */
.page-about .about-glossary {
  background: var(--white);
}

.page-about .about-glossary-grid {
  display: grid;
  gap: var(--about-gap);
}

@media (min-width: 900px) {
  .page-about .about-glossary-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 400px);
    align-items: start;
  }
}

.page-about .about-glossary-copy .prose {
  margin-top: clamp(20px, 2.6vw, 30px);
}

.page-about .about-glossary-facts {
  list-style: none;
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

@media (min-width: 640px) {
  .page-about .about-glossary-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-glossary-facts li {
  padding: 18px 16px;
  background: var(--mist);
}

.page-about .about-glossary-facts strong {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 17px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 6px;
}

.page-about .about-glossary-facts span {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-glossary-media {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--mist);
}

.page-about .about-glossary-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  filter: saturate(0.35) brightness(1.04);
}

/* ---------- 07 团队 ---------- */
.page-about .about-team {
  background: var(--mist);
}

.page-about .about-team-grid {
  display: grid;
  gap: 12px;
  margin-top: clamp(30px, 4vw, 48px);
}

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

.page-about .about-team-card {
  padding: clamp(20px, 2.4vw, 28px);
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: var(--shadow-1);
}

.page-about .about-team-card--wide {
  border-top: 4px solid var(--grass);
}

.page-about .about-team-value {
  display: inline-block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(38px, 5vw, 58px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--navy);
}

.page-about .about-team-card--wide .about-team-value {
  color: var(--grass);
}

.page-about .about-team-title {
  margin: 12px 0 10px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 18px;
  color: var(--navy);
}

.page-about .about-team-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .about-team-note {
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  max-width: 48em;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 延伸导航 ---------- */
.page-about .about-next {
  background: var(--white);
  padding: clamp(48px, 6vw, 88px) 0;
}

.page-about .about-next-title {
  margin: 0 0 clamp(24px, 3vw, 36px);
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(20px, 2.4vw, 28px);
  color: var(--navy);
}

.page-about .about-next-grid {
  display: grid;
  gap: 12px;
}

@media (min-width: 720px) {
  .page-about .about-next-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-next-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-next-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 48px;
  padding: 22px 20px;
  border-radius: var(--radius);
  background: var(--mist);
  text-decoration: none;
  transition: transform 0.26s var(--ease), box-shadow 0.26s var(--ease);
}

.page-about .about-next-card:hover,
.page-about .about-next-card:focus-visible {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
}

.page-about .about-next-card:focus-visible {
  outline: 2px solid var(--grass);
  outline-offset: 3px;
}

.page-about .about-next-kicker {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--grass);
}

.page-about .about-next-name {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 18px;
  color: var(--navy);
}

.page-about .about-next-desc {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-board,
  .page-about .about-next-card,
  .page-about .about-node::before,
  .page-about .about-event,
  .page-about .about-entry {
    transition: none;
  }

  .page-about .about-node:hover .about-board,
  .page-about .about-next-card:hover {
    transform: none;
  }
}
</main>