/* ===== 品牌与团队 · 页面专属样式（限定 .page-about 作用域） ===== */
.page-about {
  --about-rail: 268px;
  --about-paper-line: #D9CFB8;
  --about-paper-soft: #FBF7EE;
  --about-paper-text: #46536B;
  color: var(--white);
}

/* —— 骨架：移动端上下排列，桌面端轨道 + 内容双栏 —— */
.page-about .about-shell {
  display: flex;
  flex-direction: column;
  gap: 34px;
  padding-bottom: 56px;
}
.page-about .about-body {
  order: 1;
  min-width: 0;
}
.page-about .about-rail {
  order: 2;
  min-width: 0;
}

@media (min-width: 1040px) {
  .page-about .about-shell {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 68px);
    align-items: start;
    padding-bottom: 84px;
  }
  .page-about .about-body {
    order: 0;
    grid-column: 2;
    grid-row: 1;
  }
  .page-about .about-rail {
    order: 0;
    grid-column: 1;
    grid-row: 1;
    position: sticky;
    top: calc(var(--header-h) + 22px);
  }
}

/* —— 左侧品牌轨道 —— */
.page-about .about-rail {
  background: linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
}
.page-about .about-rail__figure {
  margin: 0;
}
.page-about .about-rail__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border: 1px solid var(--line);
  background: var(--ink-800);
}
.page-about .about-rail__caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}
.page-about .rail__title {
  margin: 20px 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}
.page-about .rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 6px;
}
.page-about .rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  font-size: 13.5px;
  color: var(--muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .rail__link::before {
  content: "";
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  background: var(--line);
  transition: background 0.2s var(--ease);
}
.page-about .rail__link:hover {
  color: var(--white);
  background: rgba(36, 224, 210, 0.07);
}
.page-about .rail__link[aria-current="true"] {
  color: var(--cyan);
  background: rgba(36, 224, 210, 0.09);
  border-left-color: var(--cyan);
}
.page-about .rail__link[aria-current="true"]::before {
  background: var(--cyan);
}

@media (min-width: 1040px) {
  .page-about .rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }
  .page-about .rail__link {
    display: flex;
    width: 100%;
  }
}

.page-about .rail-nums {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 20px;
  background: var(--line);
  border-top: 1px solid var(--line);
}
.page-about .rail-num {
  background: var(--ink-900);
  padding: 12px 10px 13px;
}
.page-about .rail-num__v {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--cyan);
}
.page-about .rail-num__u {
  margin-top: 7px;
  font-size: 11px;
  line-height: 1.5;
  font-weight: 300;
  color: var(--muted);
}

/* —— 首屏 —— */
.page-about .breadcrumbs {
  margin-top: 22px;
  margin-bottom: 6px;
}
.page-about .about-hero {
  border-bottom: 1px solid var(--line);
  padding-bottom: 28px;
}
.page-about .about-hero h1 {
  margin: 10px 0 16px;
  font-family: var(--font-title);
  font-size: var(--fs-h1);
  line-height: 1.22;
  letter-spacing: 0.01em;
  color: var(--white);
}
.page-about .about-hero .lead {
  max-width: 62ch;
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--muted);
}

/* —— 通用区块 —— */
.page-about .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}
.page-about .about-block {
  padding: 46px 0;
  border-bottom: 1px solid var(--ink-700);
  scroll-margin-top: calc(var(--header-h) + 24px);
}
.page-about .about-block:last-of-type {
  border-bottom: 0;
}
.page-about .about-block h2 {
  margin: 10px 0 14px;
  font-family: var(--font-title);
  font-size: var(--fs-h2);
  line-height: 1.28;
  letter-spacing: 0.01em;
}
.page-about .about-block h3 {
  font-family: var(--font-title);
  letter-spacing: 0.01em;
}
.page-about .section-head__text {
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
  font-weight: 300;
}
.page-about .prose p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
  font-weight: 300;
}
.page-about .prose p:last-child {
  margin-bottom: 0;
}

/* —— 团队构成 —— */
.page-about .about-split {
  display: grid;
  gap: 26px;
  margin-top: 28px;
}
.page-about .about-team__media {
  margin: 0;
}
.page-about .about-team__media .media__frame {
  border: 1px solid var(--line);
  background: var(--ink-800);
}
.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
}

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr);
    gap: 40px;
    align-items: start;
  }
}

.page-about .group-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 32px;
  background: var(--line);
  border: 1px solid var(--line);
}
@media (min-width: 620px) {
  .page-about .group-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (min-width: 1024px) {
  .page-about .group-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
@media (min-width: 1280px) {
  .page-about .group-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

.page-about .group-card {
  position: relative;
  background: var(--ink-900);
  padding: 22px 16px 16px;
}
.page-about .group-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--line);
}
.page-about .group-card:nth-child(1)::before { background: var(--cyan); }
.page-about .group-card:nth-child(2)::before { background: var(--orange); }
.page-about .group-card:nth-child(3)::before { background: var(--red); }
.page-about .group-card:nth-child(4)::before { background: var(--cyan-soft); }
.page-about .group-card:nth-child(5)::before { background: var(--muted); }

.page-about .group-card__code {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}
.page-about .group-card__name {
  margin: 10px 0 8px;
  font-size: 17px;
  line-height: 1.35;
  color: var(--white);
}
.page-about .group-card__meta {
  margin: 0;
  font-size: 12.5px;
  color: var(--muted);
}
.page-about .group-card__meta .mono {
  color: var(--cyan);
  font-weight: 700;
}

.page-about details > summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-top: 14px;
  padding-top: 11px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}
.page-about details > summary::-webkit-details-marker {
  display: none;
}
.page-about details > summary::after {
  content: "+";
  font-size: 14px;
  line-height: 1;
  color: var(--cyan);
}
.page-about details[open] > summary::after {
  content: "–";
}
.page-about .checklist {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}
.page-about .checklist li {
  position: relative;
  padding-left: 18px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
  font-weight: 300;
}
.page-about .checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 10px;
  height: 2px;
  background: var(--cyan);
}

/* —— 三审校对（纸面区块） —— */
.page-about .about-block--paper {
  background: var(--paper);
  color: var(--paper-ink);
  border: 1px solid var(--about-paper-line);
  padding: clamp(26px, 3.6vw, 46px);
  margin-top: 8px;
}
.page-about .about-block--paper h2 {
  color: var(--paper-ink);
}
.page-about .about-block--paper .eyebrow {
  color: #0C6F66;
}
.page-about .about-block--paper .section-head__text {
  color: var(--about-paper-text);
}
.page-about .about-block--paper .review-step__text {
  color: var(--about-paper-text);
}
.page-about .about-block--paper .checklist li {
  color: #4C5768;
}
.page-about .about-block--paper .checklist li::before {
  background: var(--red);
}

.page-about .review-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 28px;
}
@media (min-width: 860px) {
  .page-about .review-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }
}
.page-about .review-step {
  background: var(--about-paper-soft);
  border: 1px solid var(--about-paper-line);
  border-top: 3px solid var(--paper-ink);
  padding: 18px 16px 16px;
}
.page-about .review-step__num {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--red);
}
.page-about .review-step__title {
  margin: 10px 0 8px;
  font-size: 19px;
  line-height: 1.35;
  color: var(--paper-ink);
}
.page-about .review-step__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  font-weight: 300;
}
.page-about .about-block--paper details > summary {
  border-top-color: var(--about-paper-line);
  color: #0C6F66;
}
.page-about .about-block--paper details > summary::after {
  color: var(--red);
}

.page-about .paper-figure {
  margin: 32px 0 0;
  max-width: 420px;
}
.page-about .paper-figure .media__frame {
  border: 1px solid var(--about-paper-line);
  background: var(--about-paper-soft);
}
.page-about .paper-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}
.page-about .about-block--paper .media__caption {
  color: #4C5768;
}

/* —— 版本命名 —— */
.page-about .version-board {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 28px;
  background: var(--line);
  border: 1px solid var(--line);
}
@media (min-width: 860px) {
  .page-about .version-board {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  }
}
.page-about .version-board__slot {
  background: var(--ink-850);
  padding: 24px 20px;
}
.page-about .version-board__label {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}
.page-about .version-board__value {
  margin: 0;
  font-size: clamp(22px, 3.4vw, 32px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0.04em;
  color: var(--cyan);
  word-break: break-word;
}
.page-about .version-board__note {
  margin: 14px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  font-weight: 300;
  color: var(--muted);
}
.page-about .version-tags {
  list-style: none;
  margin: 0 0 4px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* —— 更新与响应 —— */
.page-about .cadence-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 28px;
}
@media (min-width: 860px) {
  .page-about .cadence-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }
}
.page-about .cadence-card {
  border-top: 3px solid var(--cyan);
}
.page-about .cadence-card:nth-child(2) {
  border-top-color: var(--orange);
}
.page-about .cadence-card .card__title {
  font-family: var(--font-title);
  font-size: 20px;
  line-height: 1.4;
}
.page-about .cadence-card .card__text {
  font-weight: 300;
  line-height: 1.8;
}
.page-about .cadence-card__meta {
  margin: 16px 0 0;
  font-size: 13px;
}
.page-about .cadence-card__link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(36, 224, 210, 0.4);
  padding-bottom: 2px;
}
.page-about .cadence-card__link:hover {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan-soft);
}

/* —— 阶段轴 —— */
.page-about .stage-axis {
  list-style: none;
  margin: 30px 0 0;
  padding: 0 0 0 22px;
  border-left: 1px solid var(--line);
  display: grid;
  gap: 34px;
}
.page-about .stage {
  position: relative;
}
.page-about .stage__dot {
  position: absolute;
  left: -28px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(36, 224, 210, 0.12);
}
.page-about .stage:nth-child(2) .stage__dot { border-color: var(--cyan-soft); }
.page-about .stage:nth-child(3) .stage__dot { border-color: var(--orange); }
.page-about .stage:nth-child(4) .stage__dot { border-color: var(--red); }

.page-about .stage__num {
  margin: 0;
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--muted);
}
.page-about .stage__title {
  margin: 8px 0 8px;
  font-size: 21px;
  line-height: 1.35;
  color: var(--white);
}
.page-about .stage__text {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.8;
  font-weight: 300;
  color: var(--muted);
}

/* —— 协作共创 —— */
.page-about .eco-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 28px;
  background: var(--line);
  border: 1px solid var(--line);
}
@media (min-width: 760px) {
  .page-about .eco-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
.page-about .eco-card {
  background: var(--ink-850);
  padding: 22px 18px 20px;
}
.page-about .eco-card__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--orange);
}
.page-about .eco-card:nth-child(2) .eco-card__num { color: var(--cyan); }
.page-about .eco-card:nth-child(3) .eco-card__num { color: var(--cyan-soft); }
.page-about .eco-card__title {
  margin: 8px 0 10px;
  font-size: 17px;
  line-height: 1.35;
  color: var(--white);
}
.page-about .eco-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  font-weight: 300;
  color: var(--muted);
}
.page-about .eco-note {
  margin: 22px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--orange);
  font-size: 14.5px;
  line-height: 1.8;
  font-weight: 300;
  color: var(--muted);
}

/* —— 收束 —— */
.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* —— 动效与无障碍 —— */
@media (prefers-reduced-motion: reduce) {
  .page-about .rail__link,
  .page-about .cadence-card__link {
    transition: none;
  }
}
</main>