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

.page-about .breadcrumbs {
  padding: clamp(14px, 3vw, 22px) 0 0;
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0 10px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--gray);
}

.page-about .breadcrumbs a {
  color: var(--link);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover {
  text-decoration: underline;
}

.page-about .breadcrumbs li:not(:first-child)::before {
  content: "/";
  color: var(--mist);
  margin-right: 10px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(18px, 3vw, 30px) 0 clamp(28px, 5vw, 52px);
}

.page-about .about-hero__rack {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  align-items: center;
}

.page-about .eyebrow {
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--red);
  margin: 0 0 10px;
}

.page-about h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6.4vw, 64px);
  line-height: 1.04;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
  max-width: 20ch;
}

.page-about h1::after {
  content: "";
  display: block;
  width: 104px;
  height: 8px;
  margin-top: 20px;
  background: linear-gradient(90deg, var(--red) 0 58%, var(--lime) 58% 78%, var(--blue) 78% 100%);
}

.page-about .about-hero__lead {
  font-size: 17px;
  line-height: 1.78;
  color: var(--gray);
  margin: 0 0 14px;
  max-width: 60ch;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 18px 0 0;
  border-top: var(--line);
  display: grid;
  gap: 14px;
}

.page-about .about-hero__facts li {
  display: grid;
  gap: 3px;
  font-size: 14px;
  color: var(--gray);
}

.page-about .about-hero__facts .num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 22px;
  line-height: 1.1;
  color: var(--ink);
}

.page-about .about-hero__visual {
  margin: 0;
  box-shadow: var(--print-shadow);
}

.page-about .about-hero__visual img,
.page-about .about-flow__figure img,
.page-about .version-band__bg {
  display: block;
  max-width: 100%;
  height: auto;
}

/* ---------- 斜切色带 ---------- */

.page-about .about-slash {
  margin: clamp(10px, 2vw, 20px) 0 clamp(30px, 5vw, 56px);
  background: var(--ink);
  border-top: 6px solid var(--red);
  border-bottom: 6px solid var(--red);
  transform: skewY(-2deg);
}

.page-about .about-slash__inner {
  transform: skewY(2deg);
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(14px, 2.4vw, 20px) var(--gutter);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 32px;
}

.page-about .about-slash__item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(15px, 2vw, 20px);
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .about-slash__item::before {
  content: "";
  width: 10px;
  height: 10px;
  background: var(--lime);
  transform: rotate(45deg);
}

/* ---------- 区块通用 ---------- */

.page-about .about-section {
  padding: clamp(32px, 6vw, 68px) 0;
}

.page-about .about-section h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1.1;
  margin: 0;
}

.page-about .about-section__lead {
  margin: 12px 0 28px;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--gray);
}

/* ---------- 四条资料线 ---------- */

.page-about .about-lines {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--ink);
}

.page-about .about-line {
  display: grid;
  gap: 10px;
  padding: 22px 0;
  border-bottom: var(--line);
  transition: background-color 0.18s var(--ease);
}

.page-about .about-line:hover {
  background: linear-gradient(90deg, rgba(200, 16, 46, 0.06), transparent 72%);
}

.page-about .about-line__num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 24px;
  line-height: 1;
  color: var(--red);
}

.page-about .about-line h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 22px;
  line-height: 1.2;
  margin: 0 0 8px;
}

.page-about .about-line p {
  margin: 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.7;
  color: var(--gray);
}

.page-about .about-line__link {
  justify-self: start;
  display: inline-block;
  padding: 8px 13px;
  border: 1px solid var(--mist);
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--link);
  text-decoration: none;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .about-line__link:hover {
  border-color: var(--red);
  color: var(--red);
}

/* ---------- 生产流程 ---------- */

.page-about .about-flow__rack {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .flow__step {
  padding: 16px 18px 16px 22px;
  margin-bottom: 10px;
  border-left: 4px solid var(--mist);
  transition: background-color 0.18s var(--ease), border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .flow__step:hover {
  border-left-color: var(--lime);
  background: rgba(20, 22, 26, 0.045);
  transform: translateX(4px);
}

.page-about .flow__idx {
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--red);
}

.page-about .flow__step h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  line-height: 1.2;
  margin: 6px 0 6px;
}

.page-about .flow__step p {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--gray);
}

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

/* ---------- 版本沿革 ---------- */

.page-about .version-band {
  position: relative;
  padding: clamp(18px, 3vw, 30px) 0 0;
}

.page-about .version-band__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.16;
  z-index: 0;
  pointer-events: none;
}

.page-about .version-track {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .version-step {
  background: var(--paper);
  border: 1px solid var(--mist);
  border-top: 6px solid var(--gray);
  padding: 20px 20px 16px;
  box-shadow: var(--print-shadow);
}

.page-about .version-step--v2 {
  border-top-color: var(--red);
}

.page-about .version-step--v3 {
  border-top-color: var(--blue);
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

.page-about .version-step__tag {
  display: inline-block;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 30px;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--gray);
  margin-bottom: 10px;
}

.page-about .version-step--v2 .version-step__tag {
  color: var(--red);
}

.page-about .version-step--v3 .version-step__tag {
  color: var(--lime);
}

.page-about .version-step h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 22px;
  line-height: 1.2;
  margin: 0 0 8px;
}

.page-about .version-step p {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--gray);
}

.page-about .version-step--v3 p {
  color: rgba(244, 241, 234, 0.8);
}

.page-about .version-step details {
  margin-top: 14px;
  padding-top: 10px;
  border-top: 1px dashed var(--mist);
}

.page-about .version-step--v3 details {
  border-top-color: rgba(244, 241, 234, 0.28);
}

.page-about .version-step summary {
  cursor: pointer;
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--link);
}

.page-about .version-step--v3 summary {
  color: var(--lime);
}

.page-about .version-step details p {
  margin: 10px 0 0;
  font-size: 15px;
}

/* ---------- 团队 ---------- */

.page-about .about-team__rack {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: center;
}

.page-about .about-team__copy p {
  margin: 0 0 14px;
  max-width: 56ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--gray);
}

.page-about .about-team__copy .btn {
  margin-top: 8px;
}

.page-about .team-roster {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--mist);
  border: 1px solid var(--mist);
}

.page-about .team-roster li {
  background: var(--paper);
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 2px 16px;
  padding: 16px 18px;
}

.page-about .team-roster__num {
  grid-row: 1 / span 2;
  align-self: center;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 30px;
  line-height: 1;
  color: var(--red);
}

.page-about .team-roster__label {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  line-height: 1.2;
}

.page-about .team-roster__desc {
  font-size: 14px;
  line-height: 1.6;
  color: var(--gray);
}

/* ---------- 规模与节奏 ---------- */

.page-about .about-scale__rack {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-scale__subtitle {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 22px;
  margin: 0 0 18px;
}

.page-about .cadence {
  list-style: none;
  margin: 0;
  padding: 0 0 0 4px;
  border-left: 2px solid var(--mist);
}

.page-about .cadence li {
  position: relative;
  padding: 0 0 20px 22px;
}

.page-about .cadence li::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 6px;
  width: 12px;
  height: 12px;
  background: var(--amber);
  border: 2px solid var(--paper);
}

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

.page-about .cadence__when {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--red);
}

.page-about .cadence p {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--gray);
}

.page-about .stat-panel {
  background: var(--ink);
  color: var(--paper);
  padding: clamp(20px, 3vw, 30px);
  border-top: 6px solid var(--lime);
  box-shadow: var(--print-shadow);
}

.page-about .stat-panel__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  letter-spacing: 0.04em;
  margin: 0 0 18px;
}

.page-about .stat-panel__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
}

.page-about .stat {
  display: grid;
  gap: 5px;
  padding-top: 10px;
  border-top: 1px solid rgba(244, 241, 234, 0.18);
}

.page-about .stat__num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1;
  color: var(--lime);
}

.page-about .stat__label {
  font-size: 13px;
  line-height: 1.5;
  color: rgba(244, 241, 234, 0.72);
}

.page-about .stat-panel__note {
  margin: 18px 0 0;
  padding-top: 12px;
  border-top: 1px solid rgba(244, 241, 234, 0.18);
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 241, 234, 0.72);
}

/* ---------- 适用人群 ---------- */

.page-about .aud-grid {
  display: grid;
  gap: 16px;
}

.page-about .aud-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px;
  background: var(--paper);
  border: 1px solid var(--mist);
  border-top: 5px solid var(--red);
}

.page-about .aud-card--old {
  border-top-color: var(--blue);
}

.page-about .aud-card--pro {
  border-top-color: var(--ink);
}

.page-about .aud-card h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 21px;
  line-height: 1.25;
  margin: 0;
}

.page-about .aud-card p {
  margin: 0;
  font-size: 16px;
  line-height: 1.72;
  color: var(--gray);
}

.page-about .aud-card__link {
  margin-top: auto;
  padding-top: 6px;
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--link);
  text-decoration: none;
}

.page-about .aud-card__link:hover {
  color: var(--red);
  text-decoration: underline;
}

/* ---------- 结尾行动带 ---------- */

.page-about .about-cta {
  background: var(--red);
  color: var(--paper);
  margin-top: clamp(28px, 5vw, 56px);
  border-bottom: 6px solid var(--ink);
}

.page-about .about-cta__rack {
  display: grid;
  gap: 22px;
  padding: clamp(28px, 5vw, 48px) 0;
}

.page-about .about-cta h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1.1;
  margin: 0 0 8px;
  color: var(--paper);
}

.page-about .about-cta p {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: rgba(244, 241, 234, 0.86);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta .btn--lime {
  color: var(--ink);
}

.page-about .about-cta .btn--ghost {
  color: var(--paper);
  border-color: rgba(244, 241, 234, 0.62);
}

.page-about .about-cta .btn--ghost:hover {
  background: var(--paper);
  color: var(--red);
  border-color: var(--paper);
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 780px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-line {
    grid-template-columns: 68px minmax(0, 1fr) 190px;
    align-items: center;
    gap: 8px 22px;
  }

  .page-about .about-line__link {
    justify-self: end;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__rack {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  }

  .page-about .about-flow__rack {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.72fr);
    align-items: start;
  }

  .page-about .about-team__rack {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .about-cta__rack {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 860px) {
  .page-about .version-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    align-items: start;
  }

  .page-about .version-step {
    margin-right: -1px;
  }

  .page-about .version-step--v1 {
    margin-top: 0;
  }

  .page-about .version-step--v2 {
    margin-top: 30px;
  }

  .page-about .version-step--v3 {
    margin-top: 60px;
  }
}

@media (min-width: 940px) {
  .page-about .about-scale__rack {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }
}