.page-about {
  background: var(--paper);
  color: var(--char);
  overflow-x: hidden;
  font-family: var(--font-body);
}

.page-about .about-crumb {
  padding-top: clamp(14px, 2vw, 22px);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  color: var(--ink);
  margin: 0;
}

.page-about p {
  margin: 0;
}

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

.page-about .about-block {
  position: relative;
  padding-block: clamp(38px, 5.5vw, 78px);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding-block: clamp(26px, 4.5vw, 54px) clamp(30px, 5vw, 64px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: min(52vw, 460px);
  height: min(40vw, 300px);
  background: var(--mist);
  clip-path: polygon(22% 0, 100% 0, 100% 100%, 0 76%);
  z-index: 0;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: clamp(18px, 3vw, 34px);
  width: clamp(64px, 9vw, 118px);
  height: 8px;
  background: var(--signal);
  z-index: 0;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(16px, 2.4vw, 26px);
}

.page-about .about-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--ink);
  text-transform: uppercase;
}

.page-about .about-hero__dot {
  width: 9px;
  height: 9px;
  background: var(--signal);
  display: inline-block;
}

.page-about .about-hero__title {
  font-weight: 900;
  letter-spacing: -0.025em;
  line-height: 1.04;
  font-size: clamp(2.05rem, 7vw, 4.9rem);
  max-width: 20ch;
}

.page-about .about-hero__lead {
  max-width: 52ch;
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  line-height: 1.78;
  color: rgba(27, 31, 36, 0.88);
}

.page-about .about-meters {
  list-style: none;
  margin: clamp(6px, 1.5vw, 14px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(14, 42, 71, 0.18);
  border: 1px solid rgba(14, 42, 71, 0.18);
  max-width: 720px;
}

.page-about .about-meters li {
  background: var(--paper);
  padding: 12px 14px;
  display: grid;
  gap: 5px;
}

.page-about .about-meters__k {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: rgba(14, 42, 71, 0.62);
}

.page-about .about-meters__v {
  font-family: var(--font-mono);
  font-size: clamp(1.05rem, 2.4vw, 1.3rem);
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.02em;
}

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: clamp(8px, 1.6vw, 16px);
}

.page-about .about-jump a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  background: #fff;
  border: 1px solid rgba(14, 42, 71, 0.22);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  text-decoration: none;
  transition: transform 0.18s var(--ease), background-color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-jump a span {
  color: var(--signal);
  font-weight: 700;
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  background: var(--mist);
  border-color: var(--ink);
  transform: translateX(2px);
}

/* ---------- 章节头 ---------- */

.page-about .section__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--signal);
  text-transform: uppercase;
  margin: 0 0 10px;
}

.page-about .section__title {
  font-weight: 900;
  letter-spacing: -0.018em;
  line-height: 1.16;
  font-size: clamp(1.45rem, 3.4vw, 2.5rem);
}

.page-about .section__lead {
  margin-top: 14px;
  max-width: 62ch;
  line-height: 1.78;
  color: rgba(27, 31, 36, 0.86);
}

/* ---------- 阶段轨 ---------- */

.page-about .about-lane__figure {
  margin: clamp(26px, 4vw, 42px) 0 0;
}

.page-about .lane__list {
  list-style: none;
  margin: clamp(24px, 3.6vw, 40px) 0 0;
  padding: 0;
  border-top: 1px solid rgba(14, 42, 71, 0.2);
}

.page-about .lane__item {
  position: relative;
  display: grid;
  gap: 12px;
  padding: 22px 0 24px 18px;
  border-bottom: 1px solid rgba(14, 42, 71, 0.2);
  transition: background-color 0.22s var(--ease);
}

.page-about .lane__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  bottom: 24px;
  width: 3px;
  background: var(--teal);
  transform: scaleY(0);
  transform-origin: 50% 0;
  transition: transform 0.28s var(--ease);
}

.page-about .lane__item:hover,
.page-about .lane__item:focus-within {
  background: rgba(217, 240, 236, 0.55);
}

.page-about .lane__item:hover::before,
.page-about .lane__item:focus-within::before {
  transform: scaleY(1);
}

.page-about .lane__rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .lane__num {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--signal);
  letter-spacing: 0.04em;
  transition: color 0.2s var(--ease);
}

.page-about .lane__item:hover .lane__num {
  color: var(--ink);
}

.page-about .lane__tick {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: rgba(14, 42, 71, 0.55);
  text-transform: uppercase;
}

.page-about .lane__title {
  font-size: clamp(1.08rem, 2.2vw, 1.32rem);
  font-weight: 800;
  line-height: 1.35;
}

.page-about .lane__text {
  margin-top: 10px;
  line-height: 1.78;
  max-width: 60ch;
  color: rgba(27, 31, 36, 0.86);
}

.page-about .lane__points {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.page-about .lane__points li {
  position: relative;
  padding-left: 20px;
  font-size: 0.925rem;
  line-height: 1.66;
  color: rgba(14, 42, 71, 0.9);
}

.page-about .lane__points li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--teal);
  font-weight: 700;
}

.page-about .lane__points a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid var(--signal);
}

.page-about .lane__points a:hover {
  background: rgba(255, 107, 53, 0.14);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  background: linear-gradient(180deg, rgba(217, 240, 236, 0.45), rgba(247, 244, 236, 0));
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(24px, 3.5vw, 48px);
}

.page-about .about-team__lead {
  margin-top: 14px;
  line-height: 1.78;
  max-width: 40ch;
  color: rgba(27, 31, 36, 0.86);
}

.page-about .about-team__intro .btn {
  margin-top: 20px;
}

.page-about .team-cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .team-card {
  position: relative;
  background: #fff;
  border: 1px solid rgba(14, 42, 71, 0.18);
  border-radius: var(--radius);
  padding: 16px 16px 18px;
  box-shadow: var(--shadow-paper);
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .team-card:hover {
  transform: translateY(-2px);
  border-color: var(--ink);
}

.page-about .team-card__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--paper);
  background: var(--ink);
  padding: 2px 7px;
  margin-bottom: 10px;
}

.page-about .team-card__title {
  font-size: 1.05rem;
  font-weight: 800;
}

.page-about .team-card__text {
  margin-top: 8px;
  font-size: 0.925rem;
  line-height: 1.72;
  color: rgba(27, 31, 36, 0.84);
}

/* ---------- 覆盖 ---------- */

.page-about .about-reach {
  background: var(--mist);
  border-top: 1px solid rgba(14, 42, 71, 0.16);
  border-bottom: 1px solid rgba(14, 42, 71, 0.16);
}

.page-about .about-reach__grid {
  display: grid;
  gap: clamp(24px, 4vw, 56px);
}

.page-about .about-reach__lead {
  margin-top: 14px;
  line-height: 1.78;
  max-width: 46ch;
  color: rgba(14, 42, 71, 0.88);
}

.page-about .reach__list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .reach__list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(14, 42, 71, 0.16);
}

.page-about .reach__v {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3vw, 1.85rem);
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.01em;
}

.page-about .reach__k {
  font-size: 0.9rem;
  color: rgba(14, 42, 71, 0.78);
}

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

/* ---------- 目录维护 ---------- */

.page-about .audit__body {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  margin-top: clamp(24px, 3.4vw, 38px);
}

.page-about .cat-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: rgba(14, 42, 71, 0.18);
  border: 1px solid rgba(14, 42, 71, 0.18);
}

.page-about .cat-grid li {
  background: #fff;
  padding: 12px 6px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--ink);
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .cat-grid li:hover {
  background: var(--ink);
  color: var(--paper);
}

.page-about .audit__note {
  margin-top: 14px;
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(27, 31, 36, 0.78);
  border-left: 3px solid var(--teal);
  padding-left: 12px;
}

.page-about .audit__card {
  background: var(--ink);
  color: var(--paper);
  padding: clamp(18px, 2.6vw, 28px);
  border-radius: var(--radius);
  box-shadow: 7px 7px 0 rgba(255, 107, 53, 0.55);
}

.page-about .audit__card-title {
  color: var(--paper);
  font-size: clamp(1.05rem, 2vw, 1.22rem);
  font-weight: 800;
  line-height: 1.4;
}

.page-about .audit__steps {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  counter-reset: audit;
  display: grid;
  gap: 12px;
}

.page-about .audit__steps li {
  counter-increment: audit;
  display: grid;
  gap: 4px;
  padding-top: 12px;
  border-top: 1px solid rgba(247, 244, 236, 0.22);
}

.page-about .audit__steps strong {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--signal);
}

.page-about .audit__steps span {
  font-size: 0.925rem;
  line-height: 1.7;
  color: rgba(247, 244, 236, 0.86);
}

/* ---------- 版本节奏 ---------- */

.page-about .about-milestone__grid {
  display: grid;
  gap: clamp(24px, 3.6vw, 50px);
}

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

.page-about .about-milestone__lead {
  margin-top: 14px;
  line-height: 1.78;
  max-width: 46ch;
  color: rgba(27, 31, 36, 0.86);
}

.page-about .milestone__list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .milestone__list li {
  padding-left: 14px;
  border-left: 2px solid var(--fog);
  transition: border-color 0.2s var(--ease);
}

.page-about .milestone__list li:hover {
  border-left-color: var(--signal);
}

.page-about .milestone__k {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--archive);
  margin-bottom: 5px;
}

.page-about .milestone__v {
  font-size: 0.945rem;
  line-height: 1.74;
  color: rgba(27, 31, 36, 0.86);
}

.page-about .about-milestone__text .btn {
  margin-top: 26px;
}

/* ---------- 联系 ---------- */

.page-about .about-contact__panel {
  position: relative;
  overflow: hidden;
  background: var(--ink-deep);
  color: var(--paper);
  padding: clamp(24px, 4vw, 48px);
  border-radius: var(--radius);
  display: grid;
  gap: clamp(22px, 3.4vw, 42px);
}

.page-about .about-contact__panel::after {
  content: "";
  position: absolute;
  right: -40px;
  bottom: -60px;
  width: 200px;
  height: 200px;
  background: rgba(255, 107, 53, 0.16);
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

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

.page-about .about-contact__panel .section__eyebrow {
  color: var(--signal);
}

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

.page-about .about-contact__lead {
  margin-top: 14px;
  line-height: 1.8;
  max-width: 48ch;
  color: rgba(247, 244, 236, 0.85);
}

.page-about .about-contact__intro .btn {
  margin-top: 22px;
}

.page-about .contact__list {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .contact__list li {
  display: grid;
  gap: 4px;
  padding-bottom: 11px;
  border-bottom: 1px solid rgba(247, 244, 236, 0.2);
}

.page-about .contact__k {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: rgba(247, 244, 236, 0.6);
}

.page-about .contact__v {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

/* ---------- 延伸入口 ---------- */

.page-about .about-next {
  padding-top: 0;
}

.page-about .about-next__title {
  font-size: clamp(1.2rem, 2.6vw, 1.6rem);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .next__list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(14, 42, 71, 0.18);
  border: 1px solid rgba(14, 42, 71, 0.18);
}

.page-about .next__item {
  background: var(--paper);
  padding: 18px 16px 20px;
  transition: background-color 0.2s var(--ease);
}

.page-about .next__item:hover {
  background: #fff;
}

.page-about .next__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--signal);
}

.page-about .next__h {
  margin-top: 8px;
  font-size: 1.05rem;
  font-weight: 800;
}

.page-about .next__h a {
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color 0.18s var(--ease);
}

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

.page-about .next__p {
  margin-top: 8px;
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(27, 31, 36, 0.8);
}

/* ---------- 图片通用 ---------- */

.page-about .media__frame {
  overflow: hidden;
  border: 1px solid rgba(14, 42, 71, 0.18);
  border-radius: var(--radius);
  background: #fff;
}

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

.page-about .media__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: rgba(14, 42, 71, 0.58);
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-about .about-meters {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .team-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 860px) {
  .page-about .lane__item {
    grid-template-columns: 160px minmax(0, 1fr);
    gap: clamp(20px, 3vw, 44px);
    padding: 28px 0 30px 20px;
  }

  .page-about .lane__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .page-about .lane__num {
    font-size: 1.9rem;
  }

  .page-about .cat-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

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

  .page-about .about-reach__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }

  .page-about .about-milestone__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .audit__body {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-contact__panel {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero__title {
    max-width: 18ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
  }

  .page-about .about-jump a:hover,
  .page-about .about-jump a:focus-visible,
  .page-about .team-card:hover {
    transform: none;
  }
}