/* ============================================================
   关于我们 /about-us/  —  页面专属样式（作用域 .page-about）
   ============================================================ */

.page-about {
  --abt-outline: rgba(53, 240, 200, 0.26);
  --abt-panel: rgba(7, 19, 15, 0.62);
  --abt-soft: rgba(36, 74, 59, 0.42);
  position: relative;
  overflow-x: clip;
}

.page-about .abt-crumb {
  padding-top: 30px;
}

/* ---------- 首屏 ---------- */

.page-about .abt-hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(18px, 4vw, 38px);
  border-bottom: 1px solid var(--line);
}

.page-about .abt-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 88%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 88%);
}

.page-about .abt-hero::after {
  content: "";
  position: absolute;
  right: -190px;
  top: -150px;
  width: 520px;
  height: 520px;
  border: 1px solid var(--abt-outline);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .abt-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 5vw, 54px);
  padding-bottom: clamp(40px, 6vw, 76px);
}

.page-about .abt-hero__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(2.3rem, 8vw, 4.3rem);
  line-height: 1.04;
  letter-spacing: -0.01em;
  color: var(--cream);
  margin: 12px 0 18px;
}

.page-about .abt-hero__sub {
  max-width: 30ch;
  margin: 0 0 22px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(1.08rem, 2.4vw, 1.42rem);
  line-height: 1.5;
  color: var(--cyan);
}

.page-about .abt-hero__intro .lede {
  max-width: 46ch;
  color: var(--cool);
}

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

.page-about .abt-hero__board {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  align-self: start;
}

.page-about .abt-stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  padding: 18px 16px 20px;
  background: var(--abt-panel);
}

.page-about .abt-stat__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.7rem, 5vw, 2.3rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--yellow);
}

.page-about .abt-stat:nth-child(2) .abt-stat__value { color: var(--cyan); }
.page-about .abt-stat:nth-child(3) .abt-stat__value { color: var(--orange); }
.page-about .abt-stat:nth-child(4) .abt-stat__value { color: var(--cream); }

.page-about .abt-stat .stat__label {
  font-family: var(--font-label);
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.08em;
  color: var(--cool);
}

/* ---------- 章节头 ---------- */

.page-about .abt-head {
  display: grid;
  gap: 10px;
  max-width: 60ch;
  margin-bottom: clamp(24px, 4vw, 42px);
}

.page-about .abt-head .lede,
.page-about .abt-flow__intro .lede {
  color: var(--cool);
  max-width: 44ch;
}

/* ---------- 01 起源 ---------- */

.page-about .abt-origin {
  background: linear-gradient(180deg, var(--abt-soft), rgba(36, 74, 59, 0));
}

.page-about .abt-origin__grid {
  display: grid;
  gap: clamp(28px, 5vw, 48px);
}

.page-about .abt-origin__aside .section-title {
  margin: 10px 0 22px;
  font-size: clamp(1.65rem, 4.4vw, 2.35rem);
  line-height: 1.2;
  color: var(--cream);
}

.page-about .abt-origin__body p {
  max-width: 42ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--cool);
}

.page-about .abt-origin__body p + p {
  margin-top: 18px;
}

.page-about .abt-facts {
  margin: 32px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .abt-facts__row {
  display: grid;
  gap: 5px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .abt-facts__key {
  font-family: var(--font-label);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--stone);
}

.page-about .abt-facts__val {
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--cream);
}

/* ---------- 图片容器 ---------- */

.page-about .abt-fig {
  margin: 0;
}

.page-about .abt-fig .figure__media {
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-deep);
}

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

.page-about .abt-fig .figure__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--stone);
}

.page-about .abt-fig--wide {
  margin-top: clamp(32px, 5vw, 56px);
}

.page-about .abt-fig--square {
  margin-top: clamp(28px, 4vw, 44px);
  max-width: 520px;
}

/* ---------- 02 记录维度 ---------- */

.page-about .abt-dims {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.page-about .abt-dim {
  min-width: 0;
  padding: 22px 20px 26px;
  background: var(--ink);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .abt-dim:hover {
  background: var(--moss);
  transform: translateY(-3px);
}

.page-about .abt-dim__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange);
  margin-bottom: 14px;
}

.page-about .abt-dim__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.18rem;
  line-height: 1.35;
  color: var(--cream);
}

.page-about .abt-dim__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--cool);
}

/* ---------- 03 数据流程 ---------- */

.page-about .abt-flow__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
}

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

.page-about .abt-timeline .timeline__item {
  position: relative;
  display: grid;
  gap: 7px;
  min-width: 0;
  padding: 0 0 26px 26px;
  border-left: 1px solid var(--line);
}

.page-about .abt-timeline .timeline__item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 6px;
  width: 7px;
  height: 7px;
  background: var(--moss);
  border: 1px solid var(--cyan);
}

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

.page-about .abt-timeline .timeline__item--now::before {
  background: var(--orange);
  border-color: var(--orange);
}

.page-about .abt-timeline .timeline__time {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .abt-timeline .timeline__item--now .timeline__time {
  color: var(--orange);
}

.page-about .abt-timeline .timeline__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--cool);
}

/* ---------- 04 读者 ---------- */

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

.page-about .abt-aud__row {
  display: grid;
  gap: 8px;
  min-width: 0;
  padding: 22px 0;
  border-bottom: 1px solid var(--line-soft);
  transition: background var(--dur) var(--ease);
}

.page-about .abt-aud__row:hover .abt-aud__num {
  color: var(--cyan);
}

.page-about .abt-aud__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange);
  transition: color var(--dur) var(--ease);
}

.page-about .abt-aud__name {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.15rem;
  line-height: 1.4;
  color: var(--cream);
}

.page-about .abt-aud__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--cool);
}

/* ---------- 05 联系看板 ---------- */

.page-about .abt-board {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  padding: clamp(24px, 4vw, 46px);
  border: 1px solid var(--line);
  background: linear-gradient(135deg, rgba(36, 74, 59, 0.55), rgba(11, 31, 26, 0.15));
}

.page-about .abt-board::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--cyan), var(--orange));
}

.page-about .abt-board__main .section-title {
  margin: 10px 0 16px;
  font-size: clamp(1.6rem, 4.2vw, 2.2rem);
  line-height: 1.22;
  color: var(--cream);
}

.page-about .abt-board__text {
  margin: 0;
  max-width: 40ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--cool);
}

.page-about .abt-contact {
  margin: 0;
}

.page-about .abt-contact__item {
  padding: 14px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .abt-contact__item:first-child {
  padding-top: 0;
}

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

.page-about .abt-contact__key {
  font-family: var(--font-label);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--stone);
}

.page-about .abt-contact__val {
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--cream);
  overflow-wrap: anywhere;
}

.page-about .abt-contact__val--mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.01em;
}

/* ---------- 收尾 ---------- */

.page-about .abt-closing {
  border-top: 1px solid var(--line);
  background: var(--ink-deep);
}

.page-about .abt-closing__line {
  max-width: 30ch;
  margin: 0 0 26px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(1.28rem, 3.4vw, 1.95rem);
  line-height: 1.5;
  color: var(--cream);
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .abt-dims {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .abt-facts__row {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }

  .page-about .abt-aud__row {
    grid-template-columns: 58px minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: start;
    gap: 22px;
    padding: 26px 0;
  }
}

@media (min-width: 980px) {
  .page-about .abt-hero__grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(280px, 0.58fr);
    align-items: start;
  }

  .page-about .abt-origin__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .abt-flow__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    align-items: start;
  }

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

  .page-about .abt-board {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
    align-items: start;
  }

  .page-about .abt-contact__item:first-child {
    padding-top: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .abt-dim,
  .page-about .abt-aud__row,
  .page-about .abt-aud__num {
    transition: none;
  }

  .page-about .abt-dim:hover {
    transform: none;
  }
}