.page-about {
  --about-cut: 22px;
  --about-hair: 1px solid var(--line-soft);
  padding-bottom: clamp(32px, 5vw, 64px);
}

/* 面包屑下方留白 */
.page-about .breadcrumb {
  padding-top: clamp(14px, 2.4vw, 26px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(20px, 3vw, 36px) 0 clamp(30px, 4.4vw, 56px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
  align-items: start;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-cond);
  font-size: clamp(2.1rem, 6.4vw, 3.6rem);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.03em;
  color: var(--paper);
  max-width: 18ch;
}

.page-about .about-hero__intro {
  margin: 18px 0 0;
  max-width: 56ch;
  color: var(--silver);
  font-size: 1rem;
  line-height: 1.8;
}

.page-about .about-hero__stats {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: var(--about-hair);
  border-radius: 12px;
  overflow: hidden;
}

.page-about .about-stat {
  background: var(--panel);
  padding: 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 4.6vw, 1.9rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--paper);
  line-height: 1;
}

.page-about .about-stat__num--amber {
  color: var(--amber);
}

.page-about .about-stat__unit {
  font-size: 0.62em;
  margin-left: 2px;
}

.page-about .about-stat__label {
  font-size: 0.76rem;
  line-height: 1.5;
  color: var(--silver);
}

.page-about .about-hero__panel {
  background: var(--panel);
  border: var(--about-hair);
  overflow: hidden;
}

.page-about .about-hero__media {
  position: relative;
  aspect-ratio: 16 / 9;
  background: var(--panel-2);
}

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

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 3px;
  background: linear-gradient(90deg, var(--amber), transparent 62%);
}

.page-about .about-facts {
  margin: 0;
  padding: 6px 18px 18px;
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .about-fact dt {
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--dim);
}

.page-about .about-fact dd {
  margin: 0;
  font-size: 0.92rem;
  color: var(--paper);
}

/* ---------- 横向主题带 ---------- */
.page-about .about-band {
  background: var(--panel);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  padding: clamp(22px, 3.4vw, 36px) 0;
}

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

.page-about .about-band__lead {
  margin: 0;
  font-family: var(--font-cond);
  font-size: clamp(1.1rem, 3vw, 1.35rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-band__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-band__item {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding-left: 14px;
  border-left: 2px solid var(--line);
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--silver);
}

.page-about .about-band__num {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--paper);
  letter-spacing: 0.01em;
}

/* ---------- 服务对象 ---------- */
.page-about .about-position__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
  align-items: start;
}

.page-about .about-position h2,
.page-about .about-system h2,
.page-about .about-history h2,
.page-about .about-team h2,
.page-about .about-quality h2,
.page-about .about-close h2 {
  margin: 12px 0 0;
  font-family: var(--font-cond);
  font-size: clamp(1.55rem, 4.4vw, 2.25rem);
  font-weight: 900;
  letter-spacing: -0.025em;
  line-height: 1.24;
  color: var(--paper);
}

.page-about .about-position__main p {
  margin: 16px 0 0;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--silver);
  max-width: 62ch;
}

.page-about .about-position__links {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-position__side {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .side-card {
  background: var(--panel-2);
  border: var(--about-hair);
  border-radius: 12px;
  padding: 18px;
}

.page-about .side-card--line {
  background: transparent;
}

.page-about .side-card__label {
  margin: 0;
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--dim);
}

.page-about .side-card__value {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .side-card__text {
  margin: 8px 0 0;
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--silver);
}

.page-about .side-card__link {
  display: inline-block;
  margin-top: 10px;
  font-size: 0.84rem;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 214, 230, 0.4);
  padding-bottom: 2px;
}

/* ---------- 内容分区 ---------- */
.page-about .about-system__intro {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .pillar-grid {
  margin-top: 28px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .pillar {
  position: relative;
  background: var(--panel);
  border: var(--about-hair);
  border-radius: 14px;
  padding: 20px 20px 18px;
  transition: border-color 0.25s ease, background-color 0.25s ease, box-shadow 0.25s ease;
}

.page-about .pillar::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  bottom: 20px;
  width: 2px;
  border-radius: 2px;
  background: var(--line);
  transition: background-color 0.25s ease;
}

.page-about .pillar--amber::before {
  background: var(--amber);
}

.page-about .pillar--cyan::before {
  background: var(--cyan);
}

.page-about .pillar:hover,
.page-about .pillar:focus-within {
  background: var(--panel-2);
  border-color: var(--line);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.42);
}

.page-about .pillar__title {
  margin: 12px 0 0;
  font-size: 1.06rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .pillar__text {
  margin: 10px 0 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--silver);
}

.page-about .pillar__link {
  display: inline-block;
  margin-top: 14px;
  font-size: 0.84rem;
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 2px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .pillar:hover .pillar__link,
.page-about .pillar__link:focus-visible {
  color: var(--amber);
  border-color: var(--amber);
}

/* ---------- 发展历程 ---------- */
.page-about .about-history__intro {
  margin: 16px 0 0;
  max-width: 60ch;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-history__banner {
  margin: 26px 0 0;
  border-radius: 14px;
  overflow: hidden;
  border: var(--about-hair);
  position: relative;
}

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

.page-about .about-history__banner .media-caption {
  position: absolute;
  left: 16px;
  bottom: 14px;
  margin: 0;
  padding: 5px 10px;
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--paper);
  background: rgba(7, 8, 10, 0.78);
  border-left: 2px solid var(--cyan);
}

.page-about .timeline {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  position: relative;
  display: grid;
  gap: 12px;
}

.page-about .timeline__item {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 14px;
  background: var(--panel);
  border: var(--about-hair);
  border-radius: 12px;
  padding: 16px;
  outline: none;
  transition: border-color 0.25s ease, background-color 0.25s ease, transform 0.2s ease;
}

.page-about .timeline__item:hover,
.page-about .timeline__item:focus-visible {
  background: var(--panel-2);
  border-color: var(--line);
  transform: translateX(4px);
}

.page-about .timeline__item:focus-visible {
  box-shadow: 0 0 0 2px var(--cyan);
}

.page-about .timeline__year {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  align-self: start;
  padding: 5px 0;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 6px;
}

.page-about .timeline__item--amber .timeline__year {
  color: var(--amber);
  border-color: rgba(240, 164, 58, 0.45);
}

.page-about .timeline__item--cyan .timeline__year {
  color: var(--cyan);
  border-color: rgba(53, 214, 230, 0.45);
}

.page-about .timeline__title {
  margin: 0;
  font-size: 0.98rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .timeline__text {
  margin: 7px 0 0;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--silver);
}

/* ---------- 团队与响应 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
  align-items: start;
}

.page-about .about-team__main p {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .team-grid {
  margin-top: 22px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .team-card {
  background: var(--panel);
  border: var(--about-hair);
  padding: 16px 18px;
}

.page-about .team-card__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
}

.page-about .team-card__name {
  margin: 8px 0 0;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .team-card__desc {
  margin: 5px 0 0;
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--silver);
}

.page-about .about-team__side {
  display: grid;
  gap: 12px;
}

.page-about .about-team__media {
  margin: 0;
  border-radius: 14px;
  overflow: hidden;
  border: var(--about-hair);
  max-height: 320px;
}

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

.page-about .respond {
  background: var(--panel);
  border: var(--about-hair);
  padding: 18px;
}

.page-about .respond__title {
  margin: 0 0 12px;
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

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

.page-about .respond__list li {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding-top: 10px;
  border-top: 1px solid var(--line-soft);
}

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

.page-about .respond__key {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--dim);
}

.page-about .respond__val {
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--paper);
}

/* ---------- 质量与安全 ---------- */
.page-about .quality-head {
  border-left: 3px solid var(--cyan);
  padding-left: 16px;
}

.page-about .quality-grid {
  margin-top: 26px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-soft);
  border: var(--about-hair);
  border-radius: 14px;
  overflow: hidden;
}

.page-about .quality-item {
  background: var(--panel);
  padding: 20px;
}

.page-about .quality-item__title {
  margin: 0;
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--paper);
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .quality-item__title::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--amber);
  flex: none;
}

.page-about .quality-item__text {
  margin: 10px 0 0;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--silver);
}

.page-about .quality-links {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 收尾 ---------- */
.page-about .about-close__panel {
  position: relative;
  background: linear-gradient(120deg, rgba(240, 164, 58, 0.1), transparent 46%), var(--panel-2);
  border: var(--about-hair);
  border-radius: 16px;
  padding: clamp(22px, 3.4vw, 36px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  overflow: hidden;
}

.page-about .about-close__panel::after {
  content: "";
  position: absolute;
  right: -60px;
  top: -60px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(53, 214, 230, 0.16), transparent 68%);
  pointer-events: none;
}

.page-about .about-close h2 {
  margin-top: 0;
  font-size: clamp(1.35rem, 3.8vw, 1.85rem);
}

.page-about .about-close__text p {
  margin: 12px 0 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--silver);
  max-width: 58ch;
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-band__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(22px, 3vw, 40px);
  }

  .page-about .about-band__inner {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: center;
    gap: clamp(20px, 3vw, 40px);
  }

  .page-about .about-position__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(22px, 3vw, 40px);
  }

  .page-about .about-position__side {
    position: sticky;
    top: 24px;
  }

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

  .page-about .pillar:nth-child(2) {
    margin-top: 28px;
  }

  .page-about .pillar:nth-child(4) {
    margin-top: 28px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(22px, 3vw, 40px);
  }

  .page-about .about-team__media {
    max-height: none;
  }

  .page-about .timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .timeline__item:first-child {
    grid-column: 1 / -1;
  }

  .page-about .about-close__panel {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
    gap: 28px;
  }

  .page-about .about-close__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero h1 {
    font-size: 3.6rem;
  }

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

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

  .page-about .timeline__item:hover,
  .page-about .timeline__item:focus-visible {
    transform: none;
  }
}