.page-about {
  --axis: rgba(143, 160, 181, .3);
  --axis-soft: rgba(143, 160, 181, .16);
  --paper-shadow: 4px 4px 0 0 var(--paper-2), 4px 4px 0 1px rgba(34, 26, 20, .55);
  --paper-shadow-hi: 7px 7px 0 0 var(--paper-2), 7px 7px 0 1px rgba(34, 26, 20, .55);
  display: block;
  padding: 26px clamp(16px, 4.5vw, 48px) 76px;
  color: var(--text);
  font-family: var(--font-body);
}

.page-about .about-wrap {
  width: 100%;
  max-width: 1040px;
  margin: 0 auto;
}

.page-about .about-wrap--wide {
  max-width: 1240px;
}

/* ---------------- 首屏 ---------------- */

.page-about .about-hero {
  padding-bottom: 6px;
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: 24px;
}

.page-about .about-hero__eyebrow {
  margin: 0;
  color: var(--steel);
  font-size: 12px;
  letter-spacing: .16em;
}

.page-about .about-hero__title {
  margin: 10px 0 0;
  max-width: 15em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 6.6vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-hero__title::before {
  content: "";
  display: block;
  width: 56px;
  height: 4px;
  margin-bottom: 20px;
  background: var(--orange);
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .hero-band {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 30px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .hero-band__cell {
  background: var(--ink-800);
  padding: 15px 16px 17px;
}

.page-about .hero-band__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 6vw, 36px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--orange);
}

.page-about .hero-band__num span {
  margin-left: 3px;
  font-size: .44em;
  letter-spacing: 0;
  color: var(--text-dim);
}

.page-about .hero-band__label {
  display: block;
  margin-top: 9px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------------- 图片容器 ---------------- */

.page-about .about-figure {
  position: relative;
  margin: 34px 0 0;
  border: 1px solid var(--line-strong);
  background: var(--ink-800);
}

.page-about .about-figure--inline {
  margin-top: 30px;
}

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

.page-about .about-figure::after {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 46px;
  height: 46px;
  border-top: 2px solid var(--orange);
  border-right: 2px solid var(--orange);
  pointer-events: none;
}

.page-about .about-figure figcaption {
  border-top: 1px solid var(--line);
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: .06em;
  color: var(--steel);
}

/* ---------------- 章节骨架 ---------------- */

.page-about .section {
  margin-top: 66px;
}

.page-about .section__head {
  margin-bottom: 26px;
}

.page-about .section__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 4vw, 34px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .section__lead {
  margin: 12px 0 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--text-dim);
}

/* ---------------- 时间轴 ---------------- */

.page-about .stage-jump {
  display: flex;
  gap: 8px;
  margin-bottom: 28px;
  padding-bottom: 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .stage-jump a {
  flex: none;
  padding: 7px 12px;
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--text-dim);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color .18s ease, color .18s ease, background-color .18s ease;
}

.page-about .stage-jump a:hover {
  border-color: var(--orange);
  color: var(--orange);
}

.page-about .stage-jump a:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
  border-color: var(--orange);
  color: var(--orange);
}

.page-about .tl {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--orange) 0%, var(--line-strong) 18%, var(--line) 100%);
}

.page-about .tl__item {
  position: relative;
  padding: 0 0 26px 34px;
}

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

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  z-index: 1;
  width: 15px;
  height: 15px;
  border: 2px solid var(--orange);
  border-radius: 50%;
  background: var(--ink-900);
  transition: background-color .2s ease, transform .2s ease;
}

.page-about .tl__item:hover::before,
.page-about .tl__item:focus-within::before {
  background: var(--orange);
  transform: scale(1.12);
}

.page-about .tl__card {
  position: relative;
  border: 1px solid var(--line);
  background: var(--ink-800);
  padding: 16px 16px 18px;
  transition: transform .2s ease, border-color .2s ease, background-color .2s ease;
}

.page-about .tl__card::before {
  content: "";
  position: absolute;
  left: -1px;
  top: -1px;
  width: 3px;
  height: 40px;
  background: var(--orange);
  opacity: .5;
  transition: opacity .2s ease, height .25s ease;
}

.page-about .tl__item:hover .tl__card,
.page-about .tl__item:focus-within .tl__card {
  transform: translateY(-3px);
  border-color: var(--line-strong);
  background: var(--ink-700);
}

.page-about .tl__item:hover .tl__card::before,
.page-about .tl__item:focus-within .tl__card::before {
  opacity: 1;
  height: 100%;
}

.page-about .tl__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.page-about .tl__version {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--white);
}

.page-about .tl__tag {
  padding: 3px 9px;
  border: 1px solid var(--steel);
  background: transparent;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--steel);
  transition: background-color .2s ease, color .2s ease, border-color .2s ease;
}

.page-about .tl__item:hover .tl__tag,
.page-about .tl__item:focus-within .tl__tag {
  border-color: var(--orange);
  background: var(--orange);
  color: var(--ink-900);
}

.page-about .tl__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  line-height: 1.42;
  color: var(--white);
}

.page-about .tl__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .tl__delta {
  margin: 13px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--rust);
  font-size: 14px;
  line-height: 1.72;
  color: var(--text);
}

.page-about .tl__delta b {
  font-weight: 700;
  color: var(--green);
}

/* ---------------- 团队 ---------------- */

.page-about .crew-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .crew-card {
  border: 1px solid var(--ink-dark);
  background: var(--paper);
  padding: 16px 16px 20px;
  box-shadow: var(--paper-shadow);
  transition: transform .2s ease, box-shadow .2s ease;
}

.page-about .crew-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--paper-shadow-hi);
}

.page-about .crew-card__idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--rust);
}

.page-about .crew-card__name {
  margin: 9px 0 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  line-height: 1.36;
  color: var(--ink-dark);
}

.page-about .crew-card__text {
  margin: 9px 0 0;
  font-family: var(--font-serif);
  font-size: 14px;
  line-height: 1.85;
  color: #4A3B31;
}

/* ---------------- 合作生态 ---------------- */

.page-about .partner-grid {
  gap: 0;
}

.page-about .partner-item {
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.page-about .partner-item__k {
  display: block;
  color: var(--rust);
  font-size: 11px;
  letter-spacing: .14em;
}

.page-about .partner-item__t {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  line-height: 1.45;
  color: var(--white);
}

.page-about .partner-item__p {
  margin: 9px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------------- 工作习惯 ---------------- */

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

.page-about .habit {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  grid-template-areas:
    "idx title"
    ".   text";
  gap: 6px 14px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .habit__idx {
  grid-area: idx;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--steel);
  transition: color .2s ease;
}

.page-about .habit__title {
  grid-area: title;
  margin: 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  line-height: 1.5;
  color: var(--white);
}

.page-about .habit__text {
  grid-area: text;
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--text-dim);
}

.page-about .habit:hover .habit__idx {
  color: var(--orange);
}

/* ---------------- 规模 ---------------- */

.page-about .scale {
  position: relative;
  overflow: hidden;
  margin-top: 66px;
  padding: 26px 18px 28px;
  border: 1px solid var(--line-strong);
  background:
    linear-gradient(135deg, rgba(255, 106, 31, .1) 0%, rgba(11, 27, 51, 0) 48%),
    var(--ink-800);
}

.page-about .scale::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(90deg, var(--axis-soft) 1px, transparent 1px);
  background-size: 46px 100%;
  opacity: .6;
  pointer-events: none;
}

.page-about .scale__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.page-about .scale__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(38px, 9vw, 62px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--orange);
}

.page-about .scale__num em {
  margin-left: 3px;
  font-style: normal;
  font-size: .36em;
  letter-spacing: 0;
  color: var(--white);
}

.page-about .scale__num--green {
  color: var(--green);
}

.page-about .scale__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--steel);
}

.page-about .scale__note {
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--orange);
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-dim);
}

/* ---------------- 下一步 ---------------- */

.page-about .next-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .next-card {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 100%);
  padding: 18px 16px 20px;
  transition: transform .2s ease, border-color .2s ease;
}

.page-about .next-card:hover {
  transform: translateY(-3px);
  border-color: var(--orange);
}

.page-about .next-card__k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--green);
}

.page-about .next-card__t {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  line-height: 1.45;
  color: var(--white);
}

.page-about .next-card__p {
  margin: 9px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------------- 收尾 ---------------- */

.page-about .closing {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px 24px;
  margin-top: 66px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.page-about .closing__text {
  margin: 0;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--text-dim);
}

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

/* ---------------- 响应式 ---------------- */

@media (min-width: 560px) {
  .page-about .hero-band {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 640px) {
  .page-about .crew-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .partner-grid {
    gap: 0 28px;
  }

  .page-about .partner-item {
    padding: 22px 0 24px;
  }
}

@media (min-width: 800px) {
  .page-about {
    padding-top: 34px;
  }

  .page-about .scale {
    padding: 34px 32px 36px;
  }

  .page-about .scale__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr)) 1.5fr;
    gap: 30px;
    align-items: end;
  }

  .page-about .about-figure figcaption {
    padding: 11px 18px;
  }
}

@media (min-width: 900px) {
  .page-about .habit {
    grid-template-columns: 72px minmax(0, 0.85fr) minmax(0, 1.3fr);
    grid-template-areas: "idx title text";
    gap: 0 30px;
    align-items: start;
    padding: 24px 0;
  }

  .page-about .habit__idx {
    font-size: 17px;
  }

  .page-about .habit__title {
    font-size: 18px;
  }

  .page-about .tl__item {
    padding-left: 42px;
  }

  .page-about .tl::before {
    left: 8px;
  }

  .page-about .tl__item::before {
    width: 17px;
    height: 17px;
    top: 9px;
  }

  .page-about .tl__card {
    padding: 20px 22px 22px;
  }

  .page-about .tl__title {
    font-size: 19px;
  }
}

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

  .page-about .next-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 1200px) {
  .page-about .stage-jump {
    overflow-x: visible;
    flex-wrap: wrap;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }
}