/* ===== 品牌概况 · 页面专属样式 ===== */

.page-about {
  --about-rail: 48px;
  --about-rail-lg: 64px;
  --about-gap: 14px;
  --about-gap-lg: 42px;
  --about-line: 3px;
}

/* ---------- 页面头部 ---------- */
.page-about .about-head {
  padding: 4px 0 30px;
  border-bottom: 3px solid var(--green-dark);
}

.page-about .about-title {
  font-size: clamp(27px, 5vw, 44px);
  line-height: 1.18;
  letter-spacing: -0.012em;
  color: var(--ink);
  margin: 12px 0 18px;
  max-width: 19em;
}

.page-about .about-lede {
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink);
  max-width: 44em;
  margin: 0 0 16px;
}

.page-about .about-lede-sub {
  font-size: 14px;
  line-height: 1.8;
  color: var(--taupe);
  max-width: 42em;
  margin: 0;
  padding-left: 14px;
  border-left: 3px solid var(--orange);
}

/* ---------- 节点时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin-top: 6px;
}

.page-about .about-node {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  gap: var(--about-gap);
  padding: 32px 0 38px;
  border-bottom: 1px solid var(--rule-soft);
}

.page-about .about-node:last-child {
  border-bottom: 0;
  padding-bottom: 24px;
}

.page-about .node-mark {
  display: flex;
  justify-content: flex-start;
}

.page-about .node-jump {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 3px solid var(--green-dark);
  border-radius: 50%;
  background: var(--ink);
  color: var(--cream);
  font-size: 15px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  text-decoration: none;
  box-shadow: 3px 3px 0 var(--green-dark);
  transition: background-color 140ms ease, border-color 140ms ease, box-shadow 140ms ease;
}

.page-about .node-jump .mono {
  font-family: var(--font-mono);
  color: inherit;
}

.page-about .node-jump:hover,
.page-about .node-jump:focus-visible {
  background: var(--orange);
  border-color: var(--ink);
  box-shadow: 3px 3px 0 var(--ink);
}

.page-about .node-jump[aria-current="location"] {
  background: var(--orange);
  border-color: var(--ink);
}

.page-about .node-content {
  min-width: 0;
}

.page-about .node-head {
  margin-bottom: 16px;
}

.page-about .node-title {
  font-size: clamp(20px, 3.1vw, 27px);
  line-height: 1.32;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 0 0 8px;
}

.page-about .node-sub {
  font-size: 15px;
  line-height: 1.8;
  color: var(--taupe);
  margin: 0;
  max-width: 42em;
}

.page-about .node-prose p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink);
}

.page-about .node-prose p:last-child {
  margin-bottom: 0;
}

.page-about .node-prose a {
  color: var(--green);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 2px;
}

.page-about .node-prose a:hover {
  color: var(--orange);
}

/* ---------- 覆盖范围条带 ---------- */
.page-about .region-band {
  margin: 4px 0 28px;
  border: 3px solid var(--green-dark);
  background: var(--panel);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

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

.page-about .region-cell {
  position: relative;
  padding: 16px 8px;
  border-right: 1px solid var(--rule-soft);
  border-bottom: 1px solid var(--rule-soft);
  text-align: center;
  outline: none;
  transition: background-color 140ms ease, box-shadow 140ms ease;
}

.page-about .region-cell:hover,
.page-about .region-cell:focus {
  background: var(--mint);
  box-shadow: inset 0 0 0 3px var(--orange);
}

.page-about .region-name {
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.01em;
}

.page-about .region-hint {
  display: block;
  font-family: var(--font-mono);
  font-size: 10.5px;
  line-height: 1.55;
  color: var(--orange);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 160ms ease, opacity 160ms ease, margin-top 160ms ease;
}

.page-about .region-cell:hover .region-hint,
.page-about .region-cell:focus .region-hint {
  max-height: 5em;
  opacity: 1;
  margin-top: 6px;
}

/* ---------- 规模双栏 ---------- */
.page-about .scale-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

.page-about .scale-copy p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink);
}

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

.page-about .scale-figure,
.page-about .team-figure,
.page-about .quality-figure {
  margin: 0;
  aspect-ratio: 1 / 1;
}

.page-about .team-figure {
  aspect-ratio: 11 / 8;
}

.page-about .quality-figure {
  aspect-ratio: 12 / 7;
  margin: 4px 0 26px;
}

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

/* ---------- 师傅章节 ---------- */
.page-about .team-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin-bottom: 28px;
}

.page-about .team-copy p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink);
}

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

/* ---------- 入驻四道关 ---------- */
.page-about .gate-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .gate-arrow {
  display: none;
}

.page-about .gate-step {
  border: 3px solid var(--green-dark);
  background: var(--panel);
  padding: 16px 18px 18px;
  box-shadow: var(--shadow-sm);
  transition: border-color 140ms ease, box-shadow 140ms ease;
}

.page-about .gate-step:hover {
  border-color: var(--orange);
  box-shadow: 4px 4px 0 var(--orange);
}

.page-about .gate-index {
  display: block;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
  letter-spacing: 0.04em;
}

.page-about .gate-name {
  font-size: 17px;
  font-weight: 800;
  color: var(--ink);
  margin: 10px 0 6px;
  line-height: 1.35;
}

.page-about .gate-desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--taupe);
}

/* ---------- 质量保障深色面板 ---------- */
.page-about .quality-panel {
  background: var(--ink);
  color: var(--cream);
  box-shadow: var(--shadow);
}

.page-about .quality-panel-title {
  font-size: 19px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--cream);
  margin: 0 0 10px;
}

.page-about .quality-panel-sub {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--cream-soft);
  max-width: 46em;
}

.page-about .quality-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  border-top: 1px solid var(--cream-faint);
}

.page-about .quality-item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--cream-faint);
}

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

.page-about .quality-index {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--yellow);
  letter-spacing: 0.04em;
}

.page-about .quality-text h4 {
  font-size: 16px;
  font-weight: 800;
  color: var(--cream);
  margin: 0 0 6px;
  line-height: 1.4;
}

.page-about .quality-text p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--cream-soft);
}

/* ---------- 发展阶段 ---------- */
.page-about .mile-list {
  list-style: none;
  margin: 4px 0 26px;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .mile-item {
  border-top: 3px solid var(--green);
  padding-top: 13px;
}

.page-about .mile-stage {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--orange);
  margin-bottom: 8px;
}

.page-about .mile-title {
  font-size: 17px;
  font-weight: 800;
  color: var(--ink);
  margin: 0 0 7px;
  line-height: 1.35;
}

.page-about .mile-text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--taupe);
}

.page-about .mile-outro {
  padding-top: 4px;
}

/* ---------- 后续入口 ---------- */
.page-about .about-next {
  margin-top: 34px;
  border-top: 3px solid var(--green-dark);
  padding-top: 24px;
}

.page-about .next-title {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--ink);
  margin: 0 0 16px;
}

.page-about .next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .next-link {
  display: block;
  border: 3px solid var(--green-dark);
  background: var(--panel);
  padding: 15px 16px;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: border-color 140ms ease, box-shadow 140ms ease, background-color 140ms ease;
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  border-color: var(--orange);
  box-shadow: 4px 4px 0 var(--orange);
  background: var(--cream);
}

.page-about .next-name {
  display: block;
  font-size: 16px;
  font-weight: 800;
  color: var(--ink);
  margin-bottom: 5px;
}

.page-about .next-link:hover .next-name,
.page-about .next-link:focus-visible .next-name {
  color: var(--orange);
}

.page-about .next-desc {
  display: block;
  font-size: 13px;
  line-height: 1.7;
  color: var(--taupe);
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about .region-grid {
    grid-template-columns: repeat(9, minmax(0, 1fr));
  }

  .page-about .region-cell {
    padding: 20px 5px;
  }

  .page-about .region-cell:nth-child(3n) {
    border-right: 1px solid var(--rule-soft);
  }

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

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-node {
    grid-template-columns: var(--about-rail-lg) minmax(0, 1fr);
    gap: var(--about-gap-lg);
    padding: 42px 0 48px;
  }

  .page-about .about-timeline::before {
    content: "";
    position: absolute;
    top: 44px;
    bottom: 44px;
    left: 31px;
    width: var(--about-line);
    background: var(--green);
  }

  .page-about .node-jump {
    width: 64px;
    height: 64px;
    font-size: 22px;
    box-shadow: 4px 4px 0 var(--green-dark);
  }

  .page-about .node-jump:hover,
  .page-about .node-jump:focus-visible {
    box-shadow: 4px 4px 0 var(--ink);
  }

  .page-about .scale-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .team-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 32px;
    align-items: start;
    margin-bottom: 32px;
  }

  .page-about .gate-flow {
    grid-template-columns:
      minmax(0, 1fr) auto
      minmax(0, 1fr) auto
      minmax(0, 1fr) auto
      minmax(0, 1fr);
    gap: 0;
    align-items: stretch;
  }

  .page-about .gate-arrow {
    display: grid;
    place-items: center;
    padding: 0 12px;
    font-family: var(--font-mono);
    font-size: 18px;
    line-height: 1;
    color: var(--green);
  }

  .page-about .gate-step {
    padding: 18px 18px 20px;
  }

  .page-about .mile-list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0;
    margin-bottom: 30px;
  }

  .page-about .mile-item {
    border-top: 3px solid var(--green);
    padding: 14px 18px 0;
    border-right: 1px solid var(--rule-soft);
  }

  .page-about .mile-item:first-child {
    padding-left: 0;
  }

  .page-about .mile-item:last-child {
    padding-right: 0;
    border-right: 0;
  }

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

  .page-about .quality-item {
    grid-template-columns: 54px minmax(0, 1fr);
    gap: 18px;
    padding: 18px 0;
  }
}

/* ---------- 超宽 ---------- */
@media (min-width: 1200px) {
  .page-about .about-node {
    padding: 48px 0 54px;
  }

  .page-about .node-title {
    font-size: 28px;
  }
}