.page-about {
  --about-axis: var(--mint);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(88px, 13vw, 152px) 0 clamp(36px, 5vw, 58px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -35% -12% auto -12%;
  height: 96%;
  pointer-events: none;
  background:
    radial-gradient(58% 68% at 20% 0%, rgba(46, 242, 200, 0.10), transparent 62%),
    radial-gradient(48% 58% at 88% 8%, rgba(57, 217, 255, 0.075), transparent 60%);
}

.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-crumbs {
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  max-width: 15em;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(31px, 5.4vw, 58px);
  line-height: 1.03;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-hero .lede {
  margin: 20px 0 0;
  max-width: 42em;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border: 1px solid var(--line);
  background: var(--bg-800);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-stats .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-stats .stat:nth-child(2n) {
  border-right: 0;
}

.page-about .about-stats .stat:nth-last-child(-n + 2) {
  border-bottom: 0;
}

.page-about .about-stats .stat__num {
  font-family: var(--font-display);
  font-size: clamp(30px, 4.6vw, 44px);
  line-height: 0.9;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

.page-about .about-stats .stat__num--mint {
  color: var(--mint);
}

.page-about .about-stats .stat__num--amber {
  color: var(--amber);
}

.page-about .about-stats .stat__label {
  font-family: var(--font-body);
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) 322px;
    gap: 64px;
    align-items: end;
  }
}

/* ---------- 主体两栏 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 34px;
  padding-top: clamp(42px, 6vw, 74px);
  padding-bottom: clamp(56px, 8vw, 104px);
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: 172px minmax(0, 1fr);
    gap: 60px;
    align-items: start;
  }
}

/* ---------- 章节索引 ---------- */
.page-about .about-toc {
  display: none;
}

.page-about .about-toc__label {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.page-about .about-toc .toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-toc .toc__link {
  display: block;
  position: relative;
  padding: 7px 0 7px 12px;
  border-left: 1px solid var(--line);
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  text-decoration: none;
  transition: color 160ms var(--ease);
}

.page-about .about-toc .toc__link::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 50%;
  width: 12px;
  height: 2px;
  margin-top: -1px;
  background: var(--mint);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 220ms var(--ease);
}

.page-about .about-toc .toc__link:hover {
  color: var(--ink);
}

.page-about .about-toc .toc__link[aria-current="true"] {
  color: var(--mint);
}

.page-about .about-toc .toc__link[aria-current="true"]::before {
  transform: scaleX(1);
}

@media (min-width: 1024px) {
  .page-about .about-toc {
    display: block;
    position: sticky;
    top: 104px;
    align-self: start;
  }
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding-top: clamp(40px, 6vw, 74px);
  border-top: 1px solid var(--line);
  scroll-margin-top: 96px;
}

.page-about .about-chapter:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .section__title {
  margin: 10px 0 0;
  max-width: 22em;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(23px, 3.2vw, 34px);
  line-height: 1.1;
  letter-spacing: -0.005em;
  color: var(--ink);
}

.page-about .section__lede {
  margin: 14px 0 0;
  max-width: 42em;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.82;
  color: var(--ink-soft);
}

.page-about .about-sub {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 800;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .about-chapter .prose p {
  margin: 0 0 14px;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

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

.page-about .about-chapter a {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 242, 200, 0.35);
  transition: border-color 160ms var(--ease);
}

.page-about .about-chapter a:hover {
  border-bottom-color: var(--mint);
}

/* ---------- 四条主线列表 ---------- */
.page-about .about-lines {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .line-row {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 0 14px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .line-row__idx {
  font-family: var(--font-display);
  font-size: 22px;
  line-height: 1.2;
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
  color: var(--mint);
}

.page-about .line-row__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  line-height: 1.32;
  color: var(--ink);
}

.page-about .line-row p {
  margin: 8px 0 0;
  max-width: 46em;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.82;
  color: var(--ink-soft);
}

@media (min-width: 720px) {
  .page-about .line-row {
    grid-template-columns: 58px minmax(0, 1fr);
    gap: 0 20px;
  }

  .page-about .line-row__idx {
    font-size: 26px;
  }
}

/* ---------- 双栏错落 ---------- */
.page-about .about-cols {
  display: grid;
  gap: 26px;
  margin-top: clamp(26px, 4vw, 40px);
}

@media (min-width: 860px) {
  .page-about .about-cols {
    grid-template-columns: minmax(0, 1fr) 272px;
    gap: 46px;
    align-items: start;
  }
}

/* ---------- 图 ---------- */
.page-about .media-frame {
  margin: 0;
}

.page-about .media-frame__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  filter: saturate(0.72) contrast(1.06) brightness(0.92);
}

.page-about .media-frame--tall .media-frame__img {
  aspect-ratio: 5 / 7;
}

.page-about .media-frame--wide .media-frame__img {
  aspect-ratio: 14 / 9;
}

.page-about .media-frame__caption {
  margin-top: 10px;
  font-family: var(--font-serif);
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .about-wide-media {
  margin-top: clamp(28px, 4vw, 42px);
}

.page-about .about-timeline-media {
  margin-top: clamp(24px, 4vw, 38px);
  position: relative;
}

.page-about .about-timeline-media::after {
  content: "";
  position: absolute;
  inset: auto 0 -1px 0;
  height: 46%;
  pointer-events: none;
  background: linear-gradient(180deg, transparent, rgba(6, 18, 15, 0.86));
}

/* ---------- 流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .flow-step {
  position: relative;
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-800);
}

.page-about .flow-step--focus {
  border-color: rgba(46, 242, 200, 0.5);
  background: linear-gradient(180deg, rgba(46, 242, 200, 0.09), rgba(11, 31, 26, 0.92));
  box-shadow: 0 0 0 1px rgba(46, 242, 200, 0.1), 0 26px 60px -42px rgba(46, 242, 200, 0.55);
}

.page-about .flow-step__k {
  display: block;
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.page-about .flow-step__t {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .flow-step p {
  margin: 8px 0 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink-soft);
}

@media (min-width: 840px) {
  .page-about .about-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .flow-step + .flow-step {
    border-left: 0;
  }

  .page-about .flow-step + .flow-step::before {
    content: "";
    position: absolute;
    left: -9px;
    top: 50%;
    width: 18px;
    height: 2px;
    margin-top: -1px;
    background: var(--mint);
    z-index: 1;
  }
}

/* ---------- 窄栏提示 ---------- */
.page-about .about-note {
  padding: 20px 18px;
  border-left: 3px solid var(--amber);
  background: linear-gradient(90deg, rgba(255, 181, 71, 0.09), transparent 80%);
}

.page-about .about-note__q {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(24px, 4vw, 38px);
}

.page-about .team-card {
  padding: 22px 20px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-800);
  box-shadow: var(--shadow-1);
}

.page-about .team-card__name {
  margin: 0;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .team-card__name::before {
  content: "";
  display: block;
  width: 26px;
  height: 2px;
  margin-bottom: 12px;
  background: var(--mint);
}

.page-about .team-card p {
  margin: 12px 0 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.82;
  color: var(--ink-soft);
}

.page-about .team-rhythm {
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 16px 0 16px 20px;
  border-left: 2px solid var(--line);
  max-width: 46em;
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

@media (min-width: 760px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 22px;
  }

  .page-about .team-grid > :nth-child(even) {
    margin-top: 26px;
  }
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0 0 0 34px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 8px;
  bottom: 36px;
  width: 2px;
  background: linear-gradient(180deg, var(--mint), rgba(46, 242, 200, 0.08));
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 30px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 7px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid var(--about-axis);
  background: var(--bg-900);
  z-index: 1;
}

.page-about .tl-item--now::before {
  background: var(--mint);
  box-shadow: 0 0 0 5px rgba(46, 242, 200, 0.14);
}

.page-about .tl-year {
  display: block;
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 38px;
  line-height: 0.9;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
  color: var(--mint);
}

.page-about .tl-item--now .tl-year {
  color: var(--amber);
}

.page-about .tl-details {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-800);
  overflow: hidden;
}

.page-about .tl-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .tl-summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-summary::marker {
  content: "";
}

.page-about .tl-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 800;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .tl-summary::after {
  content: "展开";
  margin-left: auto;
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--ink-soft);
}

.page-about .tl-details[open] .tl-summary::after {
  content: "收起";
  color: var(--mint);
}

.page-about .tl-panel {
  padding: 14px 16px 18px;
  border-top: 1px solid var(--line);
}

.page-about .tl-panel p {
  margin: 0;
  max-width: 44em;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.82;
  color: var(--ink-soft);
}

@media (min-width: 760px) {
  .page-about .about-timeline {
    padding-left: 132px;
  }

  .page-about .about-timeline::before {
    left: 92px;
  }

  .page-about .tl-item::before {
    left: -46px;
    top: 9px;
  }

  .page-about .tl-item {
    padding-bottom: 40px;
  }

  .page-about .tl-year {
    position: absolute;
    left: -132px;
    top: 2px;
    width: 80px;
    margin: 0;
    text-align: right;
    font-size: 36px;
  }
}

/* ---------- 合作与认可 ---------- */
.page-about .about-quote {
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 2px 0 2px 22px;
  border-left: 3px solid var(--amber);
}

.page-about .about-quote p {
  margin: 0;
  max-width: 36em;
  font-family: var(--font-serif);
  font-size: clamp(16px, 2.1vw, 19px);
  line-height: 1.9;
  color: var(--ink);
}

.page-about .about-facts {
  margin-top: clamp(22px, 3.5vw, 34px);
  border-top: 1px solid var(--line);
}

.page-about .fact {
  display: grid;
  grid-template-columns: 82px minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .fact__num {
  font-family: var(--font-display);
  font-size: clamp(36px, 5.6vw, 60px);
  line-height: 0.86;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--amber);
}

.page-about .fact__txt {
  margin: 0;
  max-width: 46em;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.82;
  color: var(--ink-soft);
}

@media (min-width: 720px) {
  .page-about .fact {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 28px;
  }
}

/* ---------- 联系 ---------- */
.page-about .about-contact {
  display: grid;
  gap: 16px;
  margin-top: clamp(24px, 4vw, 38px);
}

.page-about .contact-card {
  padding: 22px 20px 24px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--mint);
  border-radius: var(--radius);
  background: var(--bg-800);
}

.page-about .contact-card--plain {
  border-left-color: var(--line);
}

.page-about .contact-card__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .contact-card p {
  margin: 10px 0 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(26px, 4vw, 38px);
}

@media (min-width: 760px) {
  .page-about .about-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
  }
}

/* ---------- 窄屏保护 ---------- */
@media (max-width: 380px) {
  .page-about .line-row {
    grid-template-columns: 32px minmax(0, 1fr);
    gap: 0 10px;
  }

  .page-about .fact {
    grid-template-columns: 68px minmax(0, 1fr);
    gap: 12px;
  }

  .page-about .about-actions .btn {
    width: 100%;
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc .toc__link,
  .page-about .about-toc .toc__link::before,
  .page-about .about-chapter a {
    transition: none;
  }
}