.page-about {
  display: block;
  --about-narrow: 64ch;
}

.page-about__crumbs {
  padding-block: clamp(16px, 3vw, 28px) 0;
}

/* ---------- 首屏：对角色块与数据面板 ---------- */
.page-about .hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(24px, 4vw, 48px) clamp(42px, 7vw, 88px);
}

.page-about .hero::before {
  content: "";
  position: absolute;
  top: -14%;
  right: -20%;
  width: min(600px, 88vw);
  aspect-ratio: 1 / 1;
  background: linear-gradient(150deg, rgba(53, 224, 224, 0.22), rgba(28, 124, 134, 0) 68%);
  clip-path: polygon(40% 0%, 100% 0%, 100% 100%, 0% 46%);
  pointer-events: none;
}

.page-about .hero::after {
  content: "";
  position: absolute;
  left: -12%;
  bottom: -6%;
  width: min(380px, 64vw);
  height: clamp(80px, 14vw, 160px);
  background: linear-gradient(120deg, rgba(255, 122, 61, 0.18), rgba(255, 122, 61, 0) 72%);
  clip-path: polygon(0 22%, 100% 0%, 92% 100%, 0 78%);
  pointer-events: none;
}

.page-about .hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 5vw, 44px);
}

.page-about .hero__copy {
  max-width: 44rem;
}

.page-about .hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  align-content: start;
}

.page-about .hero__stats .stat {
  padding: 12px 14px;
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--line-cyan);
  border-radius: 2px var(--r-sm) var(--r-sm) 2px;
  background: rgba(20, 28, 51, 0.62);
}

.page-about .hero__stats .stat--orange {
  border-left-color: var(--orange);
}

.page-about .hero__stats .stat--moss {
  border-left-color: var(--moss);
}

.page-about .hero__stats .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 3.6vw, 1.7rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .hero__stats .stat--orange .stat__num {
  color: var(--orange);
}

.page-about .hero__stats .stat--moss .stat__num {
  color: var(--moss);
}

.page-about .hero__stats .stat__label {
  display: block;
  margin-top: 4px;
  font-size: 0.82rem;
  color: var(--stone);
}

/* ---------- 起点：窄栏叙述 + 强调块 ---------- */
.page-about .why__grid {
  display: grid;
  gap: 20px;
}

.page-about .why__body {
  max-width: var(--about-narrow);
}

.page-about .why__callout {
  margin-top: 28px;
}

.page-about .why__callout p {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 2.6vw, 1.35rem);
  line-height: 1.55;
  color: var(--cream);
}

/* ---------- 章节头 ---------- */
.page-about .band__head {
  max-width: 48rem;
  margin-bottom: clamp(22px, 4vw, 38px);
}

.page-about .band__lede {
  margin-top: 12px;
}

/* ---------- 图片容器 ---------- */
.page-about .figure {
  margin: 0;
}

.page-about .figure__frame {
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-sm);
}

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

.page-about .tl-figure .figure__frame {
  aspect-ratio: 14 / 9;
}

.page-about .team__figure .figure__frame {
  aspect-ratio: 4 / 3;
}

.page-about .vendors__figure .figure__frame {
  aspect-ratio: 7 / 5;
}

.page-about .tl-figure {
  margin-bottom: clamp(26px, 4vw, 42px);
}

/* ---------- 时间轴 ---------- */
.page-about .tl {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 4px;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--line-cyan), var(--line) 55%, rgba(124, 135, 152, 0));
}

.page-about .tl__item {
  position: relative;
  padding-left: 30px;
  margin-bottom: 8px;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 17px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--cyan-dim);
  transition: background var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}

.page-about .tl__item--moss::before {
  border-color: var(--moss);
}

.page-about .tl__item--clay::before {
  border-color: var(--clay);
}

.page-about .tl__item:has(details[open])::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 224, 224, 0.14);
}

.page-about .tl__node {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .tl__sum {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: 12px;
  padding: 13px 4px;
  cursor: pointer;
  list-style: none;
}

.page-about .tl__sum::-webkit-details-marker {
  display: none;
}

.page-about .tl__sum::marker {
  content: "";
}

.page-about .tl__year {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  letter-spacing: 0.04em;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .tl__head {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  line-height: 1.45;
  color: var(--cream);
}

.page-about .tl__chev {
  align-self: center;
  width: 9px;
  height: 9px;
  border-right: 1.5px solid var(--stone);
  border-bottom: 1.5px solid var(--stone);
  transform: rotate(45deg);
  transition: transform var(--t-mid) var(--ease);
}

.page-about details[open] .tl__chev {
  transform: rotate(-135deg);
}

.page-about .tl__panel {
  padding: 0 4px 16px 0;
}

.page-about .tl__panel p {
  margin: 0;
  max-width: var(--about-narrow);
  font-size: 0.93rem;
  line-height: 1.75;
  color: rgba(242, 239, 230, 0.78);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .team__intro .prose {
  max-width: 42ch;
}

.page-about .team__figure {
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .team {
  display: grid;
  gap: 14px;
}

.page-about .team__card {
  padding: 18px;
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--cyan-dim);
  border-radius: 2px var(--r-sm) var(--r-sm) 2px;
  background: var(--ink-2);
  transition: border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease),
    transform var(--t-fast) var(--ease);
}

.page-about .team__card:hover {
  border-left-color: var(--cyan);
  background: var(--ink-3);
  transform: translateY(-2px);
}

.page-about .team__badge {
  display: inline-block;
  margin-bottom: 10px;
  padding: 2px 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--cyan);
  border: 1px solid var(--line-cyan);
  border-radius: 999px;
}

.page-about .team__card .h3 {
  margin: 0 0 8px;
  font-size: 1.02rem;
}

.page-about .team__card p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: rgba(242, 239, 230, 0.76);
}

/* ---------- 厂商 ---------- */
.page-about .vendors__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .vendors__scales .h3 {
  margin: 0 0 16px;
}

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

.page-about .scale__row {
  padding: 13px 15px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-sm);
  background: rgba(20, 28, 51, 0.55);
  transition: border-color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}

.page-about .scale__row:hover {
  border-color: var(--line-cyan);
  transform: translateY(-2px);
}

.page-about .scale__top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
}

.page-about .scale__name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--cream);
}

.page-about .scale__val {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .scale__bar {
  position: relative;
  height: 4px;
  margin: 10px 0 9px;
  border-radius: 2px;
  background: rgba(124, 135, 152, 0.18);
  overflow: hidden;
}

.page-about .scale__fill {
  display: block;
  height: 100%;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--cyan-dim), var(--cyan));
}

.page-about .scale__fill--1 {
  width: 96%;
}

.page-about .scale__fill--2 {
  width: 88%;
}

.page-about .scale__fill--3 {
  width: 82%;
}

.page-about .scale__fill--4 {
  width: 74%;
}

.page-about .scale__note {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.66;
  color: rgba(242, 239, 230, 0.7);
}

.page-about .vendors__cards {
  margin-top: clamp(24px, 4vw, 40px);
  padding-top: 20px;
  border-top: 1px solid var(--line-soft);
}

.page-about .vendors__label {
  margin: 0 0 12px;
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--stone);
}

.page-about .vendors__fields {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .vendors__fields li {
  padding: 6px 14px;
  font-size: 0.86rem;
  color: var(--cream);
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(20, 28, 51, 0.6);
}

/* ---------- 维护节奏 ---------- */
.page-about .upkeep__grid {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
}

.page-about .upkeep__grid .prose {
  max-width: 44ch;
}

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

.page-about .upkeep__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .upkeep__list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: baseline;
  padding: 15px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .upkeep__cycle {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--orange);
  padding: 3px 11px;
  border: 1px solid rgba(255, 122, 61, 0.34);
  border-radius: 999px;
  white-space: nowrap;
}

.page-about .upkeep__list p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: rgba(242, 239, 230, 0.78);
}

/* ---------- 服务理念 ---------- */
.page-about .promise__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .promise__item {
  padding: 22px 18px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-sm);
  background: linear-gradient(180deg, rgba(26, 35, 64, 0.9), rgba(11, 18, 36, 0.55));
}

.page-about .promise__no {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .promise__item .h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

.page-about .promise__item p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.74;
  color: rgba(242, 239, 230, 0.76);
}

/* ---------- 尾部行动块 ---------- */
.page-about .cta-band {
  display: grid;
  gap: 18px;
  margin-top: clamp(30px, 5vw, 52px);
}

.page-about .cta-band .h3 {
  margin: 0 0 8px;
}

.page-about .cta-band p {
  margin: 0;
  max-width: 52ch;
  font-size: 0.94rem;
  line-height: 1.72;
  color: rgba(242, 239, 230, 0.78);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 860px) {
  .page-about .hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .hero__stats {
    grid-template-columns: 1fr;
  }

  .page-about .why__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .upkeep__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

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

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

@media (min-width: 980px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .vendors__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}