/* ============================================================
   品牌概况页 · /profile/ · 作用域 .page-about
   ============================================================ */

.page-about {
  --ab-line: var(--steel);
  --ab-gap: clamp(20px, 3.4vw, 40px);
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding-top: clamp(18px, 3vw, 34px);
  padding-bottom: 4px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(30px, 5.5vw, 72px) 0 clamp(48px, 8vw, 104px);
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(63, 220, 232, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(63, 220, 232, 0.07) 1px, transparent 1px);
  background-size: 96px 96px;
  -webkit-mask-image: linear-gradient(155deg, #000 0%, rgba(0, 0, 0, 0.35) 46%, transparent 72%);
  mask-image: linear-gradient(155deg, #000 0%, rgba(0, 0, 0, 0.35) 46%, transparent 72%);
  pointer-events: none;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__title {
  margin: 16px 0 22px;
  font-size: clamp(34px, 8.4vw, 74px);
  line-height: 1.08;
  font-weight: 900;
  letter-spacing: -0.012em;
  color: var(--milk);
  max-width: 15em;
}

.page-about .ab-hero__lede {
  margin: 0;
  max-width: 36em;
  font-size: clamp(16px, 2.1vw, 19px);
  line-height: 1.85;
  color: var(--rock);
}

/* ---------- 数据条 ---------- */
.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(32px, 5vw, 56px) 0 0;
  padding: 0;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}

.page-about .ab-stat {
  margin: 0;
  padding: 15px 14px 17px;
  background: var(--ink-900);
}

.page-about .ab-stat dt {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--rock);
  line-height: 1.4;
}

.page-about .ab-stat dd {
  margin: 0;
  font-family: var(--mono);
  font-size: clamp(19px, 3vw, 25px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--milk);
}

.page-about .ab-stat:nth-child(4) dd {
  color: var(--gold);
}

/* ---------- 章节跳转 ---------- */
.page-about .ab-jump {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 20px;
  margin-top: clamp(34px, 5vw, 58px);
  padding: 14px 0;
  border-top: 1px solid var(--ab-line);
  border-bottom: 1px solid var(--ab-line);
}

.page-about .ab-jump__label {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--rock);
}

.page-about .ab-jump a {
  font-size: 14px;
  color: var(--milk);
  text-decoration: none;
  padding: 2px 0;
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.page-about .ab-jump a:hover,
.page-about .ab-jump a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-section {
  padding: clamp(52px, 8.5vw, 116px) 0;
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-section__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 16px;
  margin-bottom: clamp(24px, 3.5vw, 38px);
  border-bottom: 2px solid var(--ab-line);
}

.page-about .ab-section__num {
  flex: 0 0 auto;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .ab-section__title {
  margin: 0;
  font-size: clamp(22px, 4.2vw, 38px);
  line-height: 1.26;
  font-weight: 800;
  color: var(--milk);
}

.page-about .ab-section__lede {
  margin: 0 0 clamp(24px, 3.5vw, 38px);
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--rock);
}

/* ---------- 正文块 ---------- */
.page-about .ab-copy {
  max-width: 34em;
  font-size: 16px;
  line-height: 1.88;
  color: var(--milk);
}

.page-about .ab-copy p {
  margin: 0 0 1.15em;
}

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

/* ---------- 图片容器 ---------- */
.page-about .ab-figure {
  margin: 0 0 clamp(28px, 4vw, 46px);
}

.page-about .ab-figure .figure__media {
  border: 2px solid var(--ab-line);
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .ab-figure .figure__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-figure .figure__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--rock);
}

.page-about .ab-figure--wide .figure__media img {
  aspect-ratio: 16 / 9;
}

.page-about .ab-figure--square .figure__media img {
  aspect-ratio: 1 / 1;
}

/* ---------- 版本时间线（移动端：横向滑动） ---------- */
.page-about .ab-timeline {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  padding: 4px 2px 20px;
  margin: 0;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-node {
  flex: 0 0 min(80%, 300px);
  scroll-snap-align: start;
  margin: 0;
  background: var(--ink-800);
  border: 2px solid var(--ab-line);
  box-shadow: var(--shadow-soft);
}

.page-about .ab-node__head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 16px 16px 14px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ab-node__ver {
  flex: 0 0 auto;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .ab-node__name {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.42;
  color: var(--milk);
}

.page-about .ab-node__sign {
  position: relative;
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  margin-left: auto;
  align-self: center;
}

.page-about .ab-node__sign::before,
.page-about .ab-node__sign::after {
  content: "";
  position: absolute;
  background: var(--cyan);
}

.page-about .ab-node__sign::before {
  left: 0;
  top: 8px;
  width: 18px;
  height: 2px;
}

.page-about .ab-node__sign::after {
  left: 8px;
  top: 0;
  width: 2px;
  height: 18px;
  transition: transform 0.15s ease;
}

.page-about .ab-node[open] .ab-node__sign::after {
  transform: scaleY(0);
}

.page-about .ab-node__body {
  padding: 0 16px 18px;
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-node__body p {
  margin: 14px 0 0;
  line-height: 1.8;
}

.page-about .ab-node__body p.ab-node__conclusion {
  font-size: 15px;
  color: var(--milk);
}

.page-about .ab-node__body p.ab-node__impact {
  font-size: 14px;
  color: var(--rock);
  padding-left: 12px;
  border-left: 2px solid var(--cyan-deep);
}

/* ---------- 团队分工 ---------- */
.page-about .ab-team {
  display: block;
}

.page-about .ab-team__bar {
  display: flex;
  height: 22px;
  margin: 0 0 28px;
  border: 2px solid var(--ab-line);
  overflow: hidden;
}

.page-about .ab-team__seg {
  display: block;
  height: 100%;
}

.page-about .ab-team__seg--edit {
  flex: 12 1 0;
  background: var(--cyan-deep);
}

.page-about .ab-team__seg--tech {
  flex: 14 1 0;
  background: var(--rock);
}

.page-about .ab-team__seg--ops {
  flex: 10 1 0;
  background: var(--gold-deep);
}

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

.page-about .ab-team__item {
  padding: 18px 0;
  border-bottom: 1px solid var(--ab-line);
}

.page-about .ab-team__row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.page-about .ab-team__swatch {
  flex: 0 0 auto;
  width: 12px;
  height: 12px;
}

.page-about .ab-team__swatch--edit {
  background: var(--cyan-deep);
}

.page-about .ab-team__swatch--tech {
  background: var(--rock);
}

.page-about .ab-team__swatch--ops {
  background: var(--gold-deep);
}

.page-about .ab-team__role {
  font-size: 17px;
  font-weight: 700;
  color: var(--milk);
}

.page-about .ab-team__count {
  margin-left: auto;
  font-size: 15px;
  font-weight: 700;
  color: var(--gold);
}

.page-about .ab-team__desc {
  margin: 0;
  max-width: 44ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--rock);
}

.page-about .ab-team__note {
  margin: 24px 0 0;
  max-width: 36em;
  padding-left: 14px;
  border-left: 2px solid var(--cyan-deep);
  font-size: 15px;
  line-height: 1.85;
  color: var(--rock);
}

.page-about .ab-team__figure {
  margin: clamp(28px, 4vw, 40px) 0 0;
}

/* ---------- 校对节奏 ---------- */
.page-about .ab-cadence {
  display: block;
}

.page-about .ab-cadence__figure {
  margin: clamp(28px, 4vw, 40px) 0 0;
}

/* ---------- 设备表格 ---------- */
.page-about .ab-table-wrap {
  border: 2px solid var(--ab-line);
  background: var(--ink-800);
  overflow-x: auto;
}

.page-about .ab-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: 14px;
}

.page-about .ab-table caption {
  caption-side: top;
  text-align: left;
  padding: 14px 16px;
  border-bottom: 1px solid var(--ab-line);
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.7;
  color: var(--rock);
}

.page-about .ab-table th,
.page-about .ab-table td {
  text-align: left;
  padding: 14px 16px;
  border-bottom: 1px solid var(--ab-line);
  color: var(--milk);
  white-space: nowrap;
}

.page-about .ab-table thead th {
  background: var(--ink-900);
  color: var(--cyan);
  font-size: 12px;
  letter-spacing: 0.1em;
  font-weight: 700;
}

.page-about .ab-table tbody tr:nth-child(even) {
  background: rgba(27, 58, 75, 0.34);
}

.page-about .ab-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .ab-table td:first-child {
  color: var(--gold);
  font-weight: 700;
}

.page-about .ab-table td:last-child {
  white-space: normal;
  min-width: 220px;
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.7;
  color: var(--rock);
}

.page-about .ab-devices__note {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--rock);
}

.page-about .ab-devices__note .mono {
  color: var(--milk);
}

/* ---------- 延伸阅读 ---------- */
.page-about .ab-section--next {
  border-bottom: 0;
}

.page-about .ab-next {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-next__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--ab-line);
}

.page-about .ab-next__link {
  position: relative;
  align-self: flex-start;
  font-size: 17px;
  font-weight: 700;
  color: var(--milk);
  text-decoration: none;
  padding-left: 20px;
  transition: color 0.15s ease;
}

.page-about .ab-next__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 9px;
  height: 9px;
  background: var(--cyan);
}

.page-about .ab-next__link:hover,
.page-about .ab-next__link:focus-visible {
  color: var(--cyan);
}

.page-about .ab-next__desc {
  font-size: 15px;
  line-height: 1.78;
  color: var(--rock);
  max-width: 42ch;
}

/* ---------- 可见焦点环 ---------- */
.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ============================================================
   断点
   ============================================================ */

@media (min-width: 720px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-next__item {
    flex-direction: row;
    align-items: baseline;
    gap: 24px;
  }

  .page-about .ab-next__link {
    flex: 0 0 190px;
  }
}

@media (min-width: 900px) {
  /* 时间线转为纵向刻度尺 */
  .page-about .ab-timeline {
    display: block;
    overflow: visible;
    gap: 0;
    padding: 0 0 0 44px;
    position: relative;
  }

  .page-about .ab-timeline::before {
    content: "";
    position: absolute;
    left: 8px;
    top: 14px;
    bottom: 26px;
    width: 2px;
    background: linear-gradient(180deg, var(--cyan-deep), var(--steel));
  }

  .page-about .ab-node {
    flex: none;
    position: relative;
    background: transparent;
    border: 0;
    box-shadow: none;
    padding: 0 0 36px;
    scroll-snap-align: none;
  }

  .page-about .ab-node::before {
    content: "";
    position: absolute;
    left: -30px;
    top: 22px;
    width: 30px;
    height: 2px;
    background: var(--ab-line);
  }

  .page-about .ab-node::after {
    content: "";
    position: absolute;
    left: -40px;
    top: 18px;
    width: 10px;
    height: 10px;
    background: var(--gold);
  }

  .page-about .ab-node__head {
    padding: 0 0 12px;
    border-bottom: 1px dashed var(--ab-line);
  }

  .page-about .ab-node__body {
    padding: 0;
    border-top: 0;
    max-width: 64ch;
  }

  .page-about .ab-node__body p {
    font-size: 16px;
  }

  .page-about .ab-node__body p.ab-node__impact {
    font-size: 15px;
  }

  /* 团队：正文与图示并排 */
  .page-about .ab-team {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 68px);
    align-items: start;
  }

  .page-about .ab-team__figure {
    margin: 0;
  }

  /* 校对：正文与方形图并排 */
  .page-about .ab-cadence {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 68px);
    align-items: start;
  }

  .page-about .ab-cadence__figure {
    margin: 0;
  }

  .page-about .ab-copy {
    font-size: 17px;
  }
}

@media (min-width: 1080px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .ab-stat {
    padding: 18px 16px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-node__sign::after,
  .page-about .ab-jump a,
  .page-about .ab-next__link {
    transition: none;
  }
}