.page-about {
  --about-rail: 196px;
  --about-column-gap: clamp(28px, 4vw, 64px);
  --about-block-gap: clamp(44px, 5.5vw, 84px);
  --about-text: rgba(232, 255, 244, 0.87);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  margin: 22px 0 clamp(26px, 3.6vw, 44px);
}

/* ---------- 首屏 ---------- */
.page-about .about-masthead {
  border-bottom: var(--bw) solid var(--line);
  padding-bottom: clamp(28px, 3.4vw, 44px);
}

.page-about .about-masthead .eyebrow {
  margin: 0;
  font-size: var(--fs-index);
  letter-spacing: 0.2em;
  color: var(--c-brand);
}

.page-about .about-masthead__title {
  margin: 14px 0 0;
  max-width: 22ch;
  font-size: var(--fs-h1);
  font-weight: 200;
  line-height: 1.14;
  letter-spacing: 0.01em;
  color: var(--c-white);
}

.page-about .about-masthead__lede {
  margin: 22px 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.15vw, 18px);
  line-height: 1.8;
  color: var(--c-mint);
}

.page-about .about-masthead__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: clamp(26px, 3vw, 38px) 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 720px) {
  .page-about .about-masthead__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding-top: 12px;
  border-top: var(--bw) solid var(--line-strong);
}

.page-about .about-fact__v {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 2.6vw, 1.9rem);
  line-height: 1;
  color: var(--c-accent);
}

.page-about .about-fact__l {
  font-size: var(--fs-index);
  letter-spacing: 0.14em;
  color: var(--c-muted);
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4vw, 46px);
  margin-top: clamp(38px, 4.6vw, 68px);
}

@media (min-width: 960px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-column-gap);
  }
}

/* ---------- 左侧目录 ---------- */
.page-about .about-rail {
  min-width: 0;
}

@media (min-width: 960px) {
  .page-about .about-rail {
    position: sticky;
    top: 104px;
    align-self: start;
  }
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  font-size: var(--fs-index);
  letter-spacing: 0.2em;
  color: var(--c-muted);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__list > li {
  flex: 0 0 auto;
}

@media (min-width: 960px) {
  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-about .about-rail__list > li {
    flex: none;
  }
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 13px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-pill);
  font-size: var(--fs-small);
  color: var(--c-muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}

.page-about .about-rail__no {
  font-family: var(--font-mono);
  font-size: var(--fs-index);
  letter-spacing: 0.1em;
  color: var(--c-brand);
}

.page-about .about-rail__link:hover {
  color: var(--c-mint);
  border-color: var(--line);
}

.page-about .about-rail__link:focus-visible {
  outline: 2px solid var(--c-neon);
  outline-offset: 2px;
}

@media (min-width: 960px) {
  .page-about .about-rail__link {
    padding: 9px 0 9px 14px;
    border: 0;
    border-left: 3px solid var(--line-soft);
    border-radius: 0;
    line-height: 1.5;
    white-space: normal;
  }

  .page-about .about-rail__link:hover {
    border-left-color: var(--c-brand);
  }

  .page-about .about-rail__link[data-active="true"] {
    border-left-color: var(--c-neon);
    color: var(--c-white);
  }

  .page-about .about-rail__link[data-active="true"] .about-rail__no {
    color: var(--c-neon);
  }
}

/* ---------- 叙事流 ---------- */
.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: var(--about-block-gap);
  min-width: 0;
}

.page-about .about-chapter {
  padding-top: clamp(28px, 3.4vw, 46px);
  border-top: var(--bw) solid var(--line-soft);
  scroll-margin-top: 104px;
}

.page-about .about-chapter:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: clamp(18px, 2vw, 26px);
}

.page-about .about-chapter__num {
  flex: none;
  padding-top: 0.34em;
  font-family: var(--font-mono);
  font-size: var(--fs-index);
  letter-spacing: 0.18em;
  color: var(--c-brand);
}

.page-about .about-chapter__title {
  margin: 0;
  font-size: var(--fs-h2);
  font-weight: 300;
  line-height: 1.24;
  letter-spacing: 0.01em;
  color: var(--c-white);
}

.page-about .about-chapter__body > p {
  margin: 0 0 1.05em;
  max-width: 64ch;
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--about-text);
}

.page-about .about-chapter__body > p:last-child {
  margin-bottom: 0;
}

.page-about .num {
  font-family: var(--font-mono);
  font-size: 0.95em;
  letter-spacing: 0.02em;
  color: var(--c-amber);
}

/* ---------- 服务对象 ---------- */
.page-about .about-audience {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
}

.page-about .about-audience__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-audience__item:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-audience__no {
  padding-top: 0.35em;
  font-family: var(--font-mono);
  font-size: var(--fs-index);
  letter-spacing: 0.16em;
  color: var(--c-brand);
}

.page-about .about-audience__title {
  margin: 0 0 6px;
  font-size: var(--fs-h4);
  font-weight: 500;
  line-height: 1.5;
  color: var(--c-white);
}

.page-about .about-audience__text p {
  margin: 0;
  max-width: 58ch;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--about-text);
}

.page-about .about-audience__text a {
  color: var(--c-neon);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(20px, 2.4vw, 30px);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: var(--bw) solid var(--line);
  border-radius: var(--r-card);
  background: var(--c-card);
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: var(--fs-index);
  line-height: 1.6;
  letter-spacing: 0.1em;
  color: var(--c-muted);
}

/* ---------- 年份刻度 ---------- */
.page-about .about-scale {
  margin: 0 0 clamp(22px, 2.6vw, 32px);
  padding: 4px 0 10px;
  overflow-x: auto;
  border-bottom: 1px solid var(--line-soft);
  scrollbar-width: thin;
}

.page-about .about-scale svg {
  display: block;
  width: 100%;
  min-width: 540px;
  height: auto;
}

/* ---------- 年份节点 ---------- */
.page-about .about-year {
  position: relative;
  padding: 0 0 24px 30px;
  border-left: var(--bw) solid var(--line-soft);
}

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

.page-about .about-year__dot {
  position: absolute;
  left: -8px;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--c-night);
  border: var(--bw) solid var(--c-brand);
  transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}

.page-about .about-year[open] .about-year__dot {
  background: var(--c-neon);
  border-color: var(--c-neon);
  box-shadow: 0 0 0 4px rgba(53, 230, 140, 0.16);
}

.page-about .about-year__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 4px 0 0;
  list-style: none;
  cursor: pointer;
  color: var(--c-white);
}

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

.page-about .about-year__summary::after {
  content: "＋";
  margin-left: auto;
  font-size: 13px;
  color: var(--c-muted);
  transition: color var(--t-fast) var(--ease);
}

.page-about .about-year[open] .about-year__summary::after {
  content: "－";
  color: var(--c-neon);
}

.page-about .about-year__summary:hover {
  color: var(--c-neon);
}

.page-about .about-year__summary:focus-visible {
  outline: 2px solid var(--c-neon);
  outline-offset: 3px;
  border-radius: 4px;
}

.page-about .about-year__year {
  flex: none;
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 2vw, 1.4rem);
  letter-spacing: 0.03em;
  color: var(--c-amber);
}

.page-about .about-year__label {
  font-size: var(--fs-small);
  line-height: 1.5;
  color: var(--c-mint);
}

.page-about .about-year__body {
  padding: 10px 0 0;
}

.page-about .about-year__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-year__list li {
  position: relative;
  margin-bottom: 6px;
  padding-left: 16px;
  max-width: 62ch;
  font-size: var(--fs-small);
  line-height: 1.72;
  color: var(--about-text);
}

.page-about .about-year__list li:last-child {
  margin-bottom: 0;
}

.page-about .about-year__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-brand);
}

/* ---------- 团队矩阵 ---------- */
.page-about .about-table-wrap {
  margin-top: clamp(20px, 2.4vw, 30px);
  overflow-x: auto;
}

.page-about .about-matrix {
  width: 100%;
  border-collapse: collapse;
  border: var(--bw) solid var(--line);
  background: var(--c-card);
  box-shadow: var(--shadow-hard-sm);
}

.page-about .about-matrix caption {
  caption-side: top;
  padding: 14px 16px 12px;
  text-align: left;
  font-size: var(--fs-index);
  letter-spacing: 0.16em;
  color: var(--c-muted);
}

.page-about .about-matrix th,
.page-about .about-matrix td {
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
  font-size: var(--fs-small);
  line-height: 1.65;
  color: var(--c-white);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-matrix thead th {
  font-weight: 500;
  font-size: var(--fs-index);
  letter-spacing: 0.16em;
  color: var(--c-muted);
  white-space: nowrap;
  border-bottom: var(--bw) solid var(--line);
}

.page-about .about-matrix tbody tr:last-child th,
.page-about .about-matrix tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .about-matrix tbody tr {
  transition: background var(--t-fast) var(--ease);
}

.page-about .about-matrix tbody tr:hover {
  background: rgba(23, 164, 107, 0.1);
}

.page-about .about-matrix tbody th[scope="row"] {
  font-weight: 500;
  color: var(--c-mint);
  white-space: nowrap;
}

.page-about .about-matrix__num {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  line-height: 1.2;
  color: var(--c-accent);
}

@media (max-width: 719px) {
  .page-about .about-table-wrap {
    overflow-x: visible;
  }

  .page-about .about-matrix {
    border: 0;
    background: transparent;
    box-shadow: none;
  }

  .page-about .about-matrix,
  .page-about .about-matrix tbody,
  .page-about .about-matrix tr,
  .page-about .about-matrix th,
  .page-about .about-matrix td {
    display: block;
    width: 100%;
  }

  .page-about .about-matrix thead {
    display: none;
  }

  .page-about .about-matrix caption {
    padding: 0 0 12px;
  }

  .page-about .about-matrix tbody tr {
    margin-bottom: 14px;
    padding: 16px;
    border: var(--bw) solid var(--line);
    border-radius: var(--r-card);
    background: var(--c-card);
    box-shadow: var(--shadow-hard-sm);
  }

  .page-about .about-matrix tbody tr:hover {
    background: var(--c-card);
  }

  .page-about .about-matrix tbody tr:last-child {
    margin-bottom: 0;
  }

  .page-about .about-matrix tbody th[scope="row"] {
    margin-bottom: 10px;
    padding: 0 0 10px;
    font-size: var(--fs-h4);
    border-bottom: 1px solid var(--line-soft);
  }

  .page-about .about-matrix tbody td {
    padding: 0 0 10px;
    border-bottom: 0;
  }

  .page-about .about-matrix tbody td:last-child {
    padding-bottom: 0;
  }

  .page-about .about-matrix tbody td::before {
    content: attr(data-label);
    display: block;
    margin-bottom: 3px;
    font-size: var(--fs-index);
    letter-spacing: 0.16em;
    color: var(--c-muted);
  }

  .page-about .about-matrix__num {
    font-size: 1.5rem;
  }
}

/* ---------- 制作流程 ---------- */
.page-about .about-process {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 2.6vw, 32px);
}

@media (min-width: 760px) {
  .page-about .about-process {
    grid-template-columns: minmax(0, 1fr) minmax(0, 300px);
    align-items: start;
  }
}

.page-about .about-steps {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 14px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-steps__item:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-steps__no {
  padding-top: 0.3em;
  font-family: var(--font-mono);
  font-size: var(--fs-index);
  letter-spacing: 0.14em;
  color: var(--c-neon);
}

.page-about .about-steps__title {
  margin: 0 0 4px;
  font-size: var(--fs-h4);
  font-weight: 500;
  line-height: 1.5;
  color: var(--c-white);
}

.page-about .about-steps__item p {
  margin: 0;
  max-width: 60ch;
  font-size: var(--fs-small);
  line-height: 1.72;
  color: var(--about-text);
}

.page-about .about-figure--square {
  margin-bottom: 0;
}

/* ---------- 引用块 ---------- */
.page-about .about-quote {
  margin: clamp(22px, 2.6vw, 32px) 0 0;
  padding: clamp(20px, 2.4vw, 28px);
  border: var(--bw) solid var(--c-brand);
  border-left-width: 8px;
  border-radius: var(--r-card);
  background: var(--c-deep);
  box-shadow: var(--shadow-hard-sm);
}

.page-about .about-quote__kicker {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-index);
  letter-spacing: 0.2em;
  color: var(--c-neon);
}

.page-about .about-quote p:last-child {
  margin: 0;
  max-width: 62ch;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: var(--c-mint);
}

/* ---------- 数据条 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: clamp(20px, 2.6vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}

.page-about .about-stat {
  padding: 16px 16px 14px;
  border: var(--bw) solid var(--line);
  border-radius: var(--r-card);
  background: var(--c-stand);
  transition: border-color var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}

.page-about .about-stat:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-hard-sm);
  transform: translate(-2px, -2px);
}

.page-about .about-stat__v {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 2.8vw, 1.9rem);
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--c-accent);
}

.page-about .about-stat__l {
  display: block;
  margin-top: 8px;
  font-size: var(--fs-index);
  letter-spacing: 0.14em;
  color: var(--c-muted);
}

.page-about .about-honor {
  margin-top: clamp(22px, 2.6vw, 30px);
  padding-left: 16px;
  border-left: 3px solid var(--c-brand);
}

.page-about .about-honor p {
  margin: 0;
  max-width: 62ch;
  font-size: var(--fs-small);
  line-height: 1.78;
  color: var(--about-text);
}

.page-about .about-honor a {
  color: var(--c-neon);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 2026 方向 ---------- */
.page-about .about-roadmap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

@media (min-width: 760px) {
  .page-about .about-roadmap {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

.page-about .about-roadmap__item {
  padding: 20px 18px;
  border: var(--bw) solid var(--line);
  border-radius: var(--r-card);
  background: var(--c-card);
}

.page-about .about-roadmap__item h3 {
  margin: 0 0 10px;
  font-size: var(--fs-h4);
  font-weight: 500;
  line-height: 1.5;
  color: var(--c-mint);
}

.page-about .about-roadmap__item p {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--about-text);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  margin-top: clamp(30px, 3.6vw, 48px);
  padding: clamp(24px, 3vw, 34px);
  border: var(--bw) dashed var(--line-strong);
  border-radius: var(--r-card);
  background: linear-gradient(135deg, rgba(23, 164, 107, 0.16), rgba(6, 17, 12, 0));
}

.page-about .about-cta__text {
  margin: 0 0 18px;
  max-width: 58ch;
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--c-mint);
}

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

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-stat,
  .page-about .about-matrix tbody tr,
  .page-about .about-year__dot,
  .page-about .about-year__summary::after {
    transition: none;
  }

  .page-about .about-stat:hover {
    transform: none;
  }
}