.page-about {
  --about-rail: 208px;
  --about-gap: 56px;
  --about-hair: rgba(220, 211, 190, 0.16);
  --about-hair-strong: rgba(220, 211, 190, 0.24);
  --about-text: rgba(243, 238, 225, 0.84);
  --about-text-dim: rgba(243, 238, 225, 0.68);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: 1.5rem;
  padding-bottom: 0.25rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(1rem, 3vw, 2rem) clamp(1.75rem, 4vw, 3rem);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-hero__title {
  font-size: clamp(2rem, 6.4vw, 3.5rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  margin: 0.6rem 0 0;
  max-width: 20em;
}

.page-about .about-hero__lede {
  margin-top: 1.15rem;
  max-width: 34em;
  font-size: clamp(1rem, 2.5vw, 1.1rem);
  line-height: 1.85;
  color: var(--about-text);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.15rem 1.25rem;
  margin: clamp(1.75rem, 4vw, 2.75rem) 0 0;
  padding: 0;
}

.page-about .about-hero__stat {
  border-left: 2px solid var(--pitch);
  padding-left: 0.85rem;
}

.page-about .about-hero__stat-label {
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--slate);
  margin: 0 0 0.3rem;
}

.page-about .about-hero__stat-value {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.01em;
}

.page-about .about-hero__stat-value .mono {
  font-size: 1.5rem;
  color: var(--fluoro);
}

/* ---------- 非对称双栏 ---------- */
.page-about .about-spread {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.75rem;
  padding-block: clamp(1.5rem, 4vw, 2.5rem) clamp(2.5rem, 6vw, 5rem);
}

/* 刻度轴：窄屏为横向滑动标签 */
.page-about .about-rail {
  overflow-x: auto;
  scrollbar-width: none;
  margin-inline: -4px;
}

.page-about .about-rail::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__list {
  display: flex;
  gap: 0.4rem;
  list-style: none;
  margin: 0;
  padding: 0 4px 0.5rem;
  min-width: min-content;
}

.page-about .about-rail__node {
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
  font-size: 0.82rem;
  color: var(--slate);
  text-decoration: none;
  border: 1px solid var(--about-hair-strong);
  border-radius: 999px;
  padding: 0.34rem 0.72rem;
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-rail__node:hover,
.page-about .about-rail__node:focus-visible {
  color: var(--ink-text);
  background: var(--fluoro);
  border-color: var(--fluoro);
}

.page-about .about-rail__dot {
  display: none;
}

/* ---------- 叙事区块 ---------- */
.page-about .about-block {
  scroll-margin-top: 6rem;
  padding-block: clamp(1.75rem, 4vw, 3rem);
  border-top: 1px solid var(--about-hair);
}

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

.page-about .about-block__head {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  margin-bottom: 1.4rem;
}

.page-about .about-block__num {
  flex: none;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--fluoro);
  margin: 0;
  padding-top: 0.2rem;
}

.page-about .about-block__title {
  margin: 0;
  font-size: clamp(1.4rem, 4.4vw, 2rem);
  line-height: 1.28;
  letter-spacing: -0.015em;
  color: #fff;
}

.page-about .about-copy p {
  margin: 0 0 1.05em;
  max-width: 34em;
  font-size: 1rem;
  line-height: 1.88;
  color: var(--about-text);
}

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

.page-about .about-copy__lead::first-letter {
  float: left;
  font-size: 2.7em;
  line-height: 0.92;
  font-weight: 800;
  color: var(--fluoro);
  margin: 0.06em 0.14em 0 0;
}

.page-about .about-copy__tail {
  margin: 1.5rem 0 0;
  max-width: 34em;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--about-text-dim);
  border-left: 2px solid var(--amber);
  padding-left: 0.9rem;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 1.4rem;
  border: 1px solid var(--about-hair-strong);
  background: var(--stand);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  transition: transform 0.5s var(--ease);
}

.page-about .about-figure--court img { aspect-ratio: 14 / 9; }
.page-about .about-figure--desk img { aspect-ratio: 3 / 2; }
.page-about .about-figure--board img { aspect-ratio: 4 / 3; }

.page-about .about-figure:hover img {
  transform: scale(1.02);
}

/* ---------- 三条坚持 ---------- */
.page-about .principles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .principle {
  border: 1px solid var(--about-hair-strong);
  border-radius: 2px;
  background: var(--stand);
  padding: 1.2rem 1.1rem 1.35rem;
  box-shadow: var(--shadow-paper);
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .principle:hover {
  transform: translateY(-4px);
  border-color: var(--pitch);
  box-shadow: var(--shadow-lift);
}

.page-about .principle__no {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--fluoro);
}

.page-about .principle__title {
  margin: 0.55rem 0 0.5rem;
  font-size: 1.1rem;
  line-height: 1.42;
  color: #fff;
}

.page-about .principle__text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.82;
  color: var(--about-text);
}

/* ---------- 团队 ---------- */
.page-about .about-block__grid {
  display: grid;
  gap: 1.4rem;
}

.page-about .team-card {
  border-left: 2px solid var(--pitch);
  padding: 0.1rem 0 0.1rem 0.95rem;
  margin-top: 1.3rem;
}

.page-about .team-card__title {
  margin: 0 0 0.25rem;
  font-size: 1.05rem;
  color: #fff;
}

.page-about .team-card__meta {
  margin: 0 0 0.5rem;
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--turf);
}

.page-about .team-card__text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.82;
  color: var(--about-text);
  max-width: 32em;
}

/* ---------- 内容产出四步 ---------- */
.page-about .steps {
  list-style: none;
  margin: 0 0 1.4rem;
  padding: 0;
}

.page-about .step {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr);
  gap: 0 0.7rem;
  padding: 1rem 0;
  border-top: 1px solid var(--about-hair);
}

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

.page-about .step__no {
  margin: 0;
  padding-top: 0.28rem;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--fluoro);
}

.page-about .step__title {
  margin: 0 0 0.3rem;
  font-size: 1rem;
  color: #fff;
}

.page-about .step__text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.82;
  color: var(--about-text);
  max-width: 32em;
}

/* ---------- 阶段刻度 ---------- */
.page-about .scales {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .scale {
  position: relative;
  padding: 0 0 1.6rem 1.7rem;
  border-left: 1px solid rgba(47, 179, 122, 0.4);
}

.page-about .scale:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .scale::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 0.4rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-bg);
  border: 1px solid var(--pitch);
  transition: background-color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .scale:last-child::before {
  background: var(--fluoro);
  border-color: var(--fluoro);
}

.page-about .scale:hover::before {
  background: var(--fluoro);
  border-color: var(--fluoro);
}

.page-about .scale__mark {
  margin: 0 0 0.3rem;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--slate);
}

.page-about .scale__title {
  margin: 0 0 0.35rem;
  font-size: 1.06rem;
  color: #fff;
}

.page-about .scale__text {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.84;
  color: var(--about-text);
  max-width: 32em;
}

.page-about .scale__note {
  margin: 0.55rem 0 0;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--amber);
  max-width: 30em;
}

/* ---------- 往后一年 ---------- */
.page-about .next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .next-item {
  border-top: 1px solid var(--about-hair);
  padding: 1.1rem 0;
}

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

.page-about .next-item__title {
  margin: 0 0 0.4rem;
  font-size: 1.06rem;
  color: #fff;
}

.page-about .next-item__title::before {
  content: "▸ ";
  color: var(--turf);
}

.page-about .next-item__text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.84;
  color: var(--about-text);
  max-width: 33em;
}

/* ---------- 收束 ---------- */
.page-about .about-outro {
  margin-top: clamp(2rem, 5vw, 3.25rem);
  padding-top: clamp(1.75rem, 4vw, 2.5rem);
  border-top: 1px solid var(--about-hair);
}

.page-about .about-quote {
  margin: 0;
  padding: 1.5rem 1.35rem;
  background: var(--paper);
  color: var(--ink-text);
  box-shadow: inset 0 0 0 4px var(--paper), inset 0 0 0 5px var(--paper-edge);
}

.page-about .about-quote p {
  margin: 0;
  max-width: 24em;
  font-size: clamp(1.05rem, 3.2vw, 1.32rem);
  line-height: 1.62;
  font-weight: 700;
  letter-spacing: -0.012em;
}

.page-about .about-next {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.4rem;
}

/* ---------- 中屏 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .page-about .principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.15rem;
    align-items: start;
  }

  .page-about .principles > :nth-child(2) {
    margin-top: 24px;
  }

  .page-about .principles > :nth-child(3) {
    margin-top: 48px;
  }

  .page-about .next-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .page-about .next-item {
    border-top: 2px solid var(--pitch);
    padding-top: 0.9rem;
  }

  .page-about .next-item:first-child {
    padding-top: 0.9rem;
    border-top: 2px solid var(--pitch);
  }
}

/* ---------- 桌面：左窄右宽 ---------- */
@media (min-width: 1000px) {
  .page-about .about-spread {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 5.5rem;
    align-self: start;
    overflow: visible;
    margin-inline: 0;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0.1rem;
    padding: 0;
    position: relative;
    min-width: 0;
  }

  .page-about .about-rail__list::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 0.85rem;
    bottom: 0.85rem;
    width: 1px;
    background: linear-gradient(180deg, var(--pitch) 0%, var(--turf) 55%, rgba(47, 179, 122, 0.14) 100%);
  }

  .page-about .about-rail__node {
    position: relative;
    display: block;
    border: 0;
    border-radius: 0;
    padding: 0.55rem 0.5rem 0.55rem 1.5rem;
    font-size: 0.88rem;
    white-space: normal;
    line-height: 1.4;
  }

  .page-about .about-rail__node:hover,
  .page-about .about-rail__node:focus-visible {
    background: transparent;
    color: var(--fluoro);
  }

  .page-about .about-rail__dot {
    display: block;
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--ink-bg);
    border: 1px solid var(--pitch);
    transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease);
  }

  .page-about .about-rail__node:hover .about-rail__dot,
  .page-about .about-rail__node:focus-visible .about-rail__dot {
    background: var(--fluoro);
    border-color: var(--fluoro);
  }

  .page-about .about-rail__node::after {
    content: attr(data-hint);
    position: absolute;
    left: 100%;
    top: 50%;
    margin-left: 0.6rem;
    transform: translateY(-50%) translateX(4px);
    white-space: nowrap;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--ink-text);
    background: var(--fluoro);
    padding: 0.22rem 0.55rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.22s var(--ease), transform 0.22s var(--ease);
  }

  .page-about .about-rail__node:hover::after,
  .page-about .about-rail__node:focus-visible::after {
    opacity: 1;
    transform: translateY(-50%) translateX(10px);
  }

  .page-about .about-block__grid--team {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.8fr);
    gap: 2rem;
    align-items: start;
  }

  .page-about .about-block__grid--team .about-figure {
    margin-top: 2.25rem;
    margin-bottom: 0;
  }

  .page-about .about-block__grid--process {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 2.25rem;
    align-items: start;
  }

  .page-about .about-block__grid--process .steps {
    margin-bottom: 0;
  }

  .page-about .about-block__grid--process .about-figure {
    margin-top: 1.75rem;
    margin-bottom: 0;
  }

  .page-about .scale__title {
    font-size: 1.12rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-figure img,
  .page-about .principle,
  .page-about .about-rail__node,
  .page-about .about-rail__dot,
  .page-about .scale::before {
    transition: none;
  }

  .page-about .about-figure:hover img {
    transform: none;
  }

  .page-about .principle:hover {
    transform: none;
  }
}