.page-about {
  --about-rail-w: 236px;
  background: var(--ink);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 4vw, 40px) 0 clamp(36px, 6vw, 84px);
  background:
    linear-gradient(156deg, var(--ink-2) 0%, var(--ink-2) 37%, transparent 37.2%),
    repeating-linear-gradient(90deg, rgba(145, 161, 152, .07) 0 1px, transparent 1px 72px),
    var(--ink);
  border-bottom: 1px solid var(--moss);
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  align-items: end;
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(34px, 7.2vw, 70px);
  line-height: 1.05;
  letter-spacing: -.015em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: var(--pale);
}

.page-about .about-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  padding: 10px;
  border: var(--edge);
  background: var(--ink-2);
  box-shadow: var(--shadow-paper);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.page-about .about-hero__caption {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--stone);
}

/* ---------- 主体：窄栏索引 + 宽栏章节 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 64px);
  padding-top: clamp(30px, 5vw, 68px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .about-rail {
  border-left: 1px solid var(--moss);
  padding-left: 16px;
}

.page-about .about-rail__label {
  margin: 0;
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--sand);
}

.page-about .about-rail__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 12px;
  border: 1px solid var(--moss);
  color: var(--pale);
  font-size: 13.5px;
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--lime);
  border-color: rgba(200, 255, 61, .5);
  background: rgba(200, 255, 61, .08);
}

.page-about .about-rail__link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .about-rail__num {
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--sand);
}

.page-about .about-rail__note {
  margin: 20px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  line-height: 1.9;
  color: var(--stone);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  border-top: 1px solid var(--moss);
  padding-top: clamp(26px, 4vw, 44px);
  margin-top: clamp(30px, 5vw, 54px);
}

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

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .about-chapter__num {
  flex: none;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--lime);
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(22px, 3.4vw, 33px);
  line-height: 1.28;
  letter-spacing: -.01em;
  color: var(--paper);
}

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

.page-about .about-chapter__body > p {
  margin: 0 0 16px;
  max-width: 66ch;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.9;
  color: var(--pale);
}

/* 做法说明块 */
.page-about .about-principle {
  max-width: 66ch;
  margin: 24px 0;
  padding: 16px 20px;
  border-left: 3px solid var(--lime);
  background: linear-gradient(90deg, rgba(200, 255, 61, .1), rgba(200, 255, 61, 0) 76%);
  color: var(--paper);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
}

.page-about .about-principle__tag {
  display: block;
  margin-bottom: 8px;
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--lime);
}

/* 配图 */
.page-about .about-figure {
  max-width: 720px;
  margin: 26px 0 0;
  padding: 8px;
  border: 1px solid var(--moss);
  background: rgba(15, 42, 34, .7);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 三条主线 ---------- */
.page-about .about-pillars {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 24px;
}

.page-about .about-pillar {
  padding: 20px 20px 22px;
  border: 1px solid var(--moss);
  background: linear-gradient(170deg, rgba(29, 59, 49, .55), rgba(15, 42, 34, .92));
}

.page-about .about-pillar__kicker {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .about-pillar:nth-child(2) .about-pillar__kicker {
  color: var(--sand);
}

.page-about .about-pillar:nth-child(3) .about-pillar__kicker {
  color: var(--coral);
}

.page-about .about-pillar h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 19px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-pillar p {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--pale);
}

.page-about .about-pillar__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding-bottom: 2px;
  border-bottom: 1px solid rgba(200, 255, 61, .45);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--lime);
  text-decoration: none;
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

.page-about .about-pillar__link::after {
  content: "→";
  transition: transform .2s var(--ease);
}

.page-about .about-pillar__link:hover::after,
.page-about .about-pillar__link:focus-visible::after {
  transform: translateX(4px);
}

.page-about .about-pillar__link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 团队数字 ---------- */
.page-about .about-crew {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .about-crew__item {
  padding: 14px 14px 16px;
  border-top: 2px solid var(--sand);
  background: rgba(15, 42, 34, .66);
}

.page-about .about-crew__num {
  display: block;
  font-size: clamp(26px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
}

.page-about .about-crew__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--sand);
}

.page-about .about-crew__desc {
  margin: 6px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 历程 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 22px 26px;
  border-left: 1px solid var(--moss);
}

.page-about .about-timeline__item:first-child {
  border-left-color: rgba(200, 255, 61, .55);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 5px;
  width: 11px;
  height: 11px;
  background: var(--ink-2);
  border: 2px solid var(--lime);
  transition: background .25s var(--ease), box-shadow .25s var(--ease);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(200, 255, 61, .16);
}

.page-about .about-timeline__stage {
  display: block;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .about-timeline__title {
  margin: 6px 0 4px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16.5px;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .about-timeline__desc {
  margin: 0;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--pale);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-eco__item {
  padding: 16px 18px;
  border: 1px solid var(--moss);
  background: rgba(8, 26, 21, .62);
}

.page-about .about-eco__num {
  margin: 0;
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  color: var(--sand);
}

.page-about .about-eco__label {
  margin: 8px 0 4px;
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-eco__desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--stone);
}

/* ---------- 服务承诺 ---------- */
.page-about .about-promise {
  position: relative;
  margin-top: 18px;
  padding: clamp(22px, 4vw, 38px);
  border: 1px solid var(--moss);
  background:
    linear-gradient(135deg, rgba(200, 255, 61, .1), transparent 56%),
    linear-gradient(180deg, var(--ink-2), rgba(8, 26, 21, .92));
}

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

.page-about .about-promise__item {
  position: relative;
  padding-left: 20px;
  max-width: 64ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--pale);
}

.page-about .about-promise__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: .7em;
  width: 8px;
  height: 8px;
  background: var(--lime);
}

.page-about .about-promise__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-eco {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-crew {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-pillars {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-pillar:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .about-pillar:nth-child(3) {
    margin-top: 52px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
    align-items: stretch;
  }

  .page-about .about-hero__figure {
    align-self: end;
  }

  .page-about .about-hero__figure::before {
    content: "";
    position: absolute;
    inset: 0;
    transform: translate(16px, 16px);
    border: 1px solid rgba(200, 255, 61, .28);
    pointer-events: none;
  }

  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 92px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }

  .page-about .about-rail__link {
    border-color: transparent;
    padding: 8px 10px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-rail__note {
    writing-mode: vertical-rl;
    letter-spacing: .34em;
    max-height: 210px;
    margin-top: 26px;
  }
}

@media (max-width: 420px) {
  .page-about .about-crew {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-chapter__head {
    gap: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item::before,
  .page-about .about-rail__link,
  .page-about .about-pillar__link {
    transition: none;
  }
}