.page-about {
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: clamp(1rem, 3vw, 1.75rem);
  padding: clamp(1.5rem, 4vw, 3.25rem);
  border: 2px solid var(--line);
  background:
    linear-gradient(148deg, rgba(53, 230, 208, 0.16), transparent 44%),
    linear-gradient(332deg, rgba(154, 107, 255, 0.2), transparent 48%),
    var(--panel);
  box-shadow: var(--hard-shadow);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    180deg,
    rgba(232, 238, 255, 0.05) 0 1px,
    transparent 1px 5px
  );
  pointer-events: none;
}

.page-about .about-hero > * {
  position: relative;
  z-index: 1;
}

.page-about .about-hero h1 {
  margin: 0.75rem 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.2rem, 6.4vw, 5rem);
  line-height: 1.04;
  letter-spacing: -0.01em;
  color: var(--text);
  max-width: 20em;
}

.page-about .about-hero__lede {
  margin: clamp(1rem, 2.5vw, 1.5rem) 0 0;
  max-width: 60ch;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem 1rem;
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
  padding: clamp(1rem, 3vw, 1.5rem) 0 0;
  border-top: 2px solid var(--line);
  list-style: none;
}

.page-about .about-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  min-width: 0;
}

.page-about .about-hero__stats .stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.2rem, 3vw, 1.7rem);
  line-height: 1.1;
  word-break: break-word;
}

.page-about .about-hero__stats .stat__label {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 主栅格 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  margin-top: clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-layout__aside {
  order: -1;
  min-width: 0;
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  border: 2px solid var(--line);
  background: var(--panel);
  padding: 1rem 1.1rem 1.15rem;
  box-shadow: 6px 6px 0 rgba(3, 7, 20, 0.6);
}

.page-about .about-index__title {
  margin: 0 0 0.65rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .about-index .index-list {
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0 0 0.4rem;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
}

.page-about .about-index .index-item {
  flex: 0 0 auto;
  scroll-snap-align: start;
}

.page-about .about-index .index-item a {
  display: block;
  padding: 0.4rem 0.65rem;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color 180ms var(--ease), border-color 180ms var(--ease),
    background-color 180ms var(--ease);
}

.page-about .about-index .index-item a:hover,
.page-about .about-index .index-item a:focus-visible {
  color: var(--text);
  border-color: var(--cyan);
  background-color: rgba(53, 230, 208, 0.09);
}

.page-about .about-index__note {
  margin: 0.9rem 0 0;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-index__note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  border-top: 2px solid var(--line);
  padding-top: clamp(1.1rem, 3vw, 1.75rem);
  scroll-margin-top: 6rem;
  transition: border-color 200ms var(--ease);
}

.page-about .about-chapter + .about-chapter {
  margin-top: clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-chapter:target {
  border-top-color: var(--cyan);
}

.page-about .about-chapter__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--cyan);
}

.page-about .about-chapter__title {
  margin: 0.45rem 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.75rem, 4.6vw, 3.3rem);
  line-height: 1.08;
  color: var(--text);
}

.page-about .about-chapter__lede {
  margin: 0.85rem 0 0;
  max-width: 62ch;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-chapter__more {
  margin: clamp(1.25rem, 3vw, 1.75rem) 0 0;
}

.page-about .about-subtitle {
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.1rem, 2.4vw, 1.5rem);
  line-height: 1.3;
  color: var(--text);
}

/* ---------- 沿革时间线 ---------- */
.page-about .about-timeline {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
  margin-top: clamp(1.5rem, 3vw, 2.25rem);
}

.page-about .about-timeline__media {
  position: relative;
  border: 2px solid var(--line);
  background: var(--ink);
  overflow: hidden;
}

.page-about .about-timeline__media img {
  display: block;
  width: 100%;
  height: 230px;
  object-fit: cover;
  opacity: 0.92;
}

.page-about .about-timeline__track {
  position: relative;
  display: grid;
  gap: clamp(1rem, 2.5vw, 1.4rem);
  margin: 0;
  padding: 0 0 0 1.6rem;
  list-style: none;
}

.page-about .about-timeline__track::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0.75rem;
  bottom: 0.75rem;
  width: 2px;
  background: linear-gradient(
    180deg,
    var(--cyan),
    var(--violet) 55%,
    rgba(154, 107, 255, 0)
  );
}

.page-about .about-stage {
  position: relative;
  padding: 1.1rem 1.2rem 1.2rem;
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: 6px 6px 0 rgba(3, 7, 20, 0.55);
  transition: transform 240ms var(--ease), border-color 240ms var(--ease);
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -1.6rem;
  top: 1.35rem;
  width: 12px;
  height: 12px;
  background: var(--ink);
  border: 2px solid var(--cyan);
  transform: rotate(45deg);
}

.page-about .about-stage:hover,
.page-about .about-stage:focus-within {
  transform: translate(-2px, -2px);
  border-color: rgba(53, 230, 208, 0.55);
}

.page-about .about-stage__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-about .about-stage__meta .num-cyan {
  margin-right: 0.35rem;
}

.page-about .about-stage__title {
  margin: 0.5rem 0 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.05rem, 2.6vw, 1.4rem);
  line-height: 1.3;
  color: var(--text);
}

.page-about .about-stage__body {
  margin: 0.6rem 0 0;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-stage .drawer {
  margin-top: 0.85rem;
}

/* ---------- 三类人群 ---------- */
.page-about .about-audience {
  display: grid;
  gap: clamp(1rem, 2.5vw, 1.4rem);
  margin-top: clamp(1.5rem, 3vw, 2.25rem);
  align-items: start;
}

.page-about .about-audience__card {
  min-width: 0;
}

/* ---------- 服务范围 ---------- */
.page-about .about-reach {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
  margin-top: clamp(2rem, 4vw, 3rem);
  padding: clamp(1rem, 3vw, 1.75rem);
  border: 2px solid var(--line);
  background:
    linear-gradient(180deg, rgba(53, 230, 208, 0.1), transparent 55%),
    var(--panel);
}

.page-about .about-reach__media {
  margin: 0;
  min-width: 0;
}

.page-about .about-reach__media img {
  display: block;
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.page-about .about-reach__body {
  min-width: 0;
}

.page-about .about-reach__body .about-subtitle {
  margin-top: 0;
}

.page-about .about-reach__body > p {
  margin: 0.7rem 0 0;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-reach__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem 1rem;
  margin: 1.25rem 0 0;
  padding: 1rem 0 0;
  border-top: 1px dashed var(--line);
  list-style: none;
}

.page-about .about-reach__stats li {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-width: 0;
}

.page-about .about-reach__stats .stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1rem, 2.4vw, 1.35rem);
  line-height: 1.15;
  word-break: break-word;
}

.page-about .about-reach__stats .stat__label {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 分类列表 ---------- */
.page-about .about-cat-list {
  display: grid;
  gap: 0.75rem;
  margin: clamp(1.5rem, 3vw, 2.25rem) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cat {
  position: relative;
  padding: 0.9rem 1rem 1rem;
  border: 2px solid var(--line);
  border-left: 4px solid var(--violet);
  background: rgba(16, 26, 56, 0.7);
  transition: border-color 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .about-cat:hover {
  border-color: rgba(154, 107, 255, 0.7);
  border-left-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .about-cat__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
}

.page-about .about-cat__name {
  margin: 0.35rem 0 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.1rem;
  color: var(--text);
}

.page-about .about-cat__for {
  margin: 0.4rem 0 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence {
  display: grid;
  gap: clamp(1rem, 2.5vw, 1.4rem);
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
}

.page-about .about-cadence__item {
  padding: 1.15rem 1.25rem 1.25rem;
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: 6px 6px 0 rgba(3, 7, 20, 0.5);
}

.page-about .about-cadence__item--amber {
  border-top: 4px solid var(--amber);
}

.page-about .about-cadence__item--violet {
  border-top: 4px solid var(--violet);
}

.page-about .about-cadence__item h3 {
  margin: 0.7rem 0 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.05rem;
  line-height: 1.35;
  color: var(--text);
}

.page-about .about-cadence__item p {
  margin: 0.55rem 0 0;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
  margin-top: clamp(1.5rem, 3vw, 2.25rem);
  align-items: start;
}

.page-about .about-team__body {
  display: grid;
  gap: 1rem;
  min-width: 0;
}

.page-about .about-team__unit {
  padding: 1.05rem 1.15rem 1.15rem;
  border: 2px solid var(--line);
  border-left: 4px solid var(--cyan);
  background: var(--panel);
}

.page-about .about-team__unit h3 {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--text);
}

.page-about .about-team__unit p {
  margin: 0.55rem 0 0;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-team__media {
  margin: 0;
  min-width: 0;
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: 210px;
  object-fit: cover;
}

.page-about .about-team__note {
  margin: 0.85rem 0 0;
  max-width: 60ch;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 合作生态带 ---------- */
.page-about .about-eco {
  display: flex;
  gap: 1rem;
  margin-top: 1.25rem;
  padding-bottom: 0.9rem;
}

.page-about .about-eco__card {
  flex: 0 0 auto;
  width: min(76vw, 250px);
  min-width: 0;
  scroll-snap-align: start;
}

.page-about .about-eco__card .card__title {
  font-family: var(--font-display);
}

.page-about .about-eco__card .card__body {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.75;
}

/* ---------- 长期做法 ---------- */
.page-about .about-principles {
  display: grid;
  gap: 1rem;
  margin: clamp(1.5rem, 3vw, 2.25rem) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-principle {
  position: relative;
  padding: 1.1rem 1.2rem 1.2rem 1.6rem;
  border: 2px solid var(--line);
  background: var(--panel);
  overflow: hidden;
}

.page-about .about-principle::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 6px;
}

.page-about .about-principle--amber::before {
  background: linear-gradient(180deg, var(--amber), rgba(255, 180, 58, 0.15));
}

.page-about .about-principle--violet::before {
  background: linear-gradient(180deg, var(--violet), rgba(154, 107, 255, 0.15));
}

.page-about .about-principle--cyan::before {
  background: linear-gradient(180deg, var(--cyan), rgba(53, 230, 208, 0.15));
}

.page-about .about-principle--green::before {
  background: linear-gradient(180deg, var(--ok), rgba(70, 224, 160, 0.15));
}

.page-about .about-principle__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
}

.page-about .about-principle h3 {
  margin: 0.5rem 0 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.08rem;
  line-height: 1.35;
  color: var(--text);
}

.page-about .about-principle p {
  margin: 0.55rem 0 0;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-principle p a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 四问四答 ---------- */
.page-about .about-qa {
  margin-top: clamp(1.5rem, 3vw, 2.25rem);
}

.page-about .about-qa__list {
  display: grid;
  gap: 0.75rem;
  margin-top: 1rem;
}

.page-about .about-qa__item {
  border: 2px solid var(--line);
  background: var(--panel);
}

.page-about .about-qa__item[hidden] {
  display: none;
}

.page-about .about-qa__idx {
  display: inline-block;
  margin-right: 0.6rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-qa__item .drawer__body p {
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 收束指引 ---------- */
.page-about .about-continue {
  margin-top: clamp(2.5rem, 6vw, 4rem);
}

/* ---------- 媒体查询 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-audience {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-audience > :nth-child(2) {
    margin-top: 22px;
  }

  .page-about .about-audience > :nth-child(3) {
    margin-top: 44px;
  }

  .page-about .about-reach {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
  }

  .page-about .about-reach__media img {
    height: auto;
    aspect-ratio: 14 / 9;
  }

  .page-about .about-timeline {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(1.5rem, 4vw, 3rem);
  }

  .page-about .about-timeline__media {
    position: sticky;
    top: 6.5rem;
  }

  .page-about .about-timeline__media img {
    height: auto;
    aspect-ratio: 4 / 5;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
  }

  .page-about .about-team__media img {
    height: auto;
    aspect-ratio: 3 / 2;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 1fr) 264px;
    align-items: start;
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-about .about-layout__aside {
    order: 0;
    position: sticky;
    top: 6.5rem;
  }

  .page-about .about-index .index-list {
    flex-direction: column;
    gap: 0.15rem;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index .index-item {
    width: 100%;
  }

  .page-about .about-index .index-item a {
    border: 0;
    border-left: 2px solid var(--line);
    padding: 0.4rem 0 0.4rem 0.75rem;
    white-space: normal;
    letter-spacing: 0.06em;
  }

  .page-about .about-index .index-item a:hover,
  .page-about .about-index .index-item a:focus-visible {
    border-left-color: var(--cyan);
    background-color: transparent;
  }

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

@media (min-width: 1280px) {
  .page-about .about-timeline {
    grid-template-columns: 240px minmax(0, 1fr);
  }

  .page-about .about-eco__card {
    width: 268px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stage,
  .page-about .about-cat,
  .page-about .about-index .index-item a,
  .page-about .about-chapter {
    transition: none;
  }

  .page-about .about-stage:hover,
  .page-about .about-stage:focus-within,
  .page-about .about-cat:hover {
    transform: none;
  }
}