/* ===== 看台档案 /story/ 页面专属样式 ===== */
.page-about {
  --about-rail: 224px;
  --about-gap: clamp(32px, 5vw, 72px);
  --about-card-bg: linear-gradient(180deg, var(--layer), rgba(12, 27, 46, 0.55));
  padding-bottom: clamp(72px, 10vw, 140px);
  color: var(--ice);
}

.page-about .breadcrumb {
  margin-top: clamp(20px, 3vw, 36px);
  margin-bottom: clamp(20px, 3vw, 36px);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
}

.page-about .breadcrumb__link {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

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

.page-about .breadcrumb__current {
  color: var(--ice);
}

/* --- 首屏：文字建筑 --- */
.page-about .about-intro {
  position: relative;
  max-width: 1000px;
  padding-bottom: clamp(36px, 6vw, 72px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-intro__mark {
  display: inline-block;
  margin-bottom: clamp(24px, 4vw, 44px);
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: rgba(53, 240, 208, 0.05);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--cyan);
}

.page-about .about-intro__title {
  margin: 0 0 clamp(20px, 3vw, 32px);
  line-height: 0.96;
  letter-spacing: -0.01em;
}

.page-about .about-intro__lede {
  max-width: 37ch;
  margin: 0;
  color: var(--muted);
}

/* --- 双栏骨架 --- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  padding-top: clamp(40px, 6vw, 76px);
}

.page-about .about-rail {
  display: none;
}

.page-about .about-index .side-index__title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--cyan);
  margin: 0 0 16px;
}

.page-about .about-index .side-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--line);
}

.page-about .about-index .side-index__list > li {
  margin: 0;
}

.page-about .about-index .side-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0 9px 16px;
  margin-left: -1px;
  border-left: 2px solid transparent;
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .about-index .side-index__link:hover,
.page-about .about-index .side-index__link:focus-visible,
.page-about .about-index .side-index__link.is-visible {
  color: var(--ice);
  border-left-color: var(--cyan);
}

.page-about .about-index .side-index__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

/* --- 阶段区块 --- */
.page-about .about-content {
  min-width: 0;
}

.page-about .about-stage {
  position: relative;
  scroll-margin-top: 110px;
}

.page-about .about-stage + .about-stage {
  margin-top: clamp(56px, 8vw, 108px);
}

.page-about .about-stage__head {
  display: flex;
  align-items: flex-start;
  gap: clamp(12px, 2vw, 22px);
}

.page-about .about-stage__vlabel {
  flex: none;
  writing-mode: vertical-rl;
  padding-top: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--cyan);
  opacity: 0.85;
}

.page-about .about-stage__title {
  margin: 0 0 10px;
  line-height: 1.06;
}

.page-about .about-stage__kicker {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .section-rule {
  display: block;
  height: 1px;
  margin: clamp(20px, 3vw, 32px) 0 clamp(24px, 4vw, 40px);
  background: linear-gradient(90deg, var(--cyan), rgba(30, 53, 80, 0));
}

.page-about .about-stage__body {
  max-width: 38ch;
}

.page-about .about-stage__body + .about-stage__body {
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .about-stage__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 240, 208, 0.4);
  transition: border-color 200ms var(--ease);
}

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

.page-about .about-next {
  margin: clamp(28px, 4vw, 44px) 0 0;
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-next__link {
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 122, 47, 0.45);
  transition: border-color 200ms var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-bottom-color: var(--signal);
}

/* --- 图片 --- */
.page-about .about-figure {
  margin: clamp(28px, 4vw, 48px) 0;
  padding: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 2px;
  object-fit: cover;
  background: var(--layer);
}

.page-about .about-figure .media__caption {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-figure--timeline img {
  aspect-ratio: 16 / 9;
}

.page-about .about-figure--tree img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--outro img {
  aspect-ratio: 4 / 3;
}

/* --- 时间线 / 阶段卡片 --- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0 0 0 clamp(18px, 3vw, 30px);
  border-left: 1px solid var(--line);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 14px;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * clamp(18px, 3vw, 30px) - 4px);
  top: 20px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 240, 208, 0.12);
}

.page-about .stage-node {
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--about-card-bg);
  transition: border-color 220ms var(--ease), transform 220ms var(--ease);
}

.page-about .stage-node:hover {
  border-color: rgba(53, 240, 208, 0.45);
}

.page-about .stage-node[open] {
  border-color: rgba(53, 240, 208, 0.55);
}

.page-about .stage-node__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .stage-node__summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .stage-node__year {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .stage-node__name {
  font-size: 16px;
  font-weight: 700;
  color: var(--ice);
}

.page-about .stage-node__hint {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--muted);
  transition: transform 220ms var(--ease), color 220ms var(--ease);
}

.page-about .stage-node[open] .stage-node__hint {
  transform: rotate(45deg);
  color: var(--signal);
}

.page-about .stage-node__panel {
  padding: 0 18px 18px;
  max-width: 46ch;
}

.page-about .stage-node__panel p {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--muted);
}

/* --- 分工角色 --- */
.page-about .about-roles {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-role {
  position: relative;
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--about-card-bg);
}

.page-about .about-role::after {
  content: "";
  position: absolute;
  inset: 6px -6px -6px 6px;
  border: 1px solid rgba(30, 53, 80, 0.6);
  border-radius: 2px;
  z-index: -1;
}

.page-about .about-role__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 12px;
  flex-wrap: wrap;
}

.page-about .about-role__count {
  font-family: var(--font-mono);
  font-size: clamp(28px, 5vw, 40px);
  font-weight: 500;
  letter-spacing: 0.04em;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-role__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--ice);
}

.page-about .about-role__text {
  margin: 0;
  max-width: 40ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--muted);
}

/* --- 流程步骤 --- */
.page-about .about-flow {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 2px;
  overflow: hidden;
}

.page-about .about-flow__step {
  background: var(--deep);
  padding: clamp(20px, 3vw, 28px);
}

.page-about .about-flow__num {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-flow__title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ice);
}

.page-about .about-flow__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--muted);
}

/* --- 数据条 --- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(24px, 4vw, 40px) 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 2px;
  overflow: hidden;
}

.page-about .about-stat {
  background: var(--deep);
  padding: clamp(18px, 3vw, 26px);
}

.page-about .about-stat__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: clamp(20px, 4vw, 32px);
  font-weight: 500;
  letter-spacing: 0.04em;
  line-height: 1.1;
  color: var(--cyan);
}

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

/* --- 状态标签 --- */
.page-about .about-tags {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-tags li {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
  border-radius: 2px;
  background: var(--about-card-bg);
}

.page-about .about-tags__desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* --- 37% 数据条 --- */
.page-about .about-bar {
  margin: clamp(24px, 4vw, 36px) 0 8px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.page-about .about-bar__note {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
}

/* --- 收尾 --- */
.page-about .about-outro {
  margin-top: clamp(64px, 9vw, 120px);
  border-top: 1px solid var(--line);
  padding-top: clamp(36px, 5vw, 64px);
}

.page-about .about-outro .about-figure {
  margin-top: 0;
}

.page-about .about-outro__panel {
  margin-top: clamp(24px, 4vw, 44px);
}

.page-about .about-outro__title {
  margin: 0 0 16px;
  line-height: 1.08;
}

.page-about .about-outro__text {
  margin: 0 0 clamp(24px, 4vw, 36px);
  max-width: 40ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--muted);
}

.page-about .about-cta {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 2px;
  overflow: hidden;
}

.page-about .about-cta__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  background: var(--deep);
  color: var(--ice);
  text-decoration: none;
  font-size: 15px;
  transition: background 220ms var(--ease), color 220ms var(--ease);
}

.page-about .about-cta__link:hover,
.page-about .about-cta__link:focus-visible {
  background: var(--layer);
  color: var(--signal);
}

.page-about .about-cta__arrow {
  font-family: var(--font-mono);
  color: var(--cyan);
  transition: transform 220ms var(--ease), color 220ms var(--ease);
}

.page-about .about-cta__link:hover .about-cta__arrow,
.page-about .about-cta__link:focus-visible .about-cta__arrow {
  transform: translateX(5px);
  color: var(--signal);
}

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

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

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

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

  .page-about .about-tags li {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

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

/* --- 桌面：非对称双栏 + 跟随索引 --- */
@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(48px, 7vw, 96px);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 112px;
    align-self: start;
  }

  .page-about .about-figure--timeline img {
    aspect-ratio: 21 / 9;
  }

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

/* --- 宽屏：放大留白与文字体量 --- */
@media (min-width: 1280px) {
  .page-about .about-stage__body {
    max-width: 40ch;
  }

  .page-about .about-intro__lede {
    max-width: 42ch;
  }
}
<<<END>>>