.page-about {
  padding: 20px 0 64px;
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏拼贴 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  display: grid;
  gap: 32px;
  margin-top: 20px;
  padding: clamp(24px, 5vw, 56px);
  background: var(--ink);
  color: var(--paper-bright);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-soft);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -70px;
  right: -70px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 107, 53, 0.32), transparent 70%);
  pointer-events: none;
}

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

.page-about .about-hero h1 {
  margin: 10px 0 18px;
  color: var(--paper-bright);
  font-size: clamp(30px, 5.4vw, 50px);
  line-height: 1.14;
  letter-spacing: -0.01em;
}

.page-about .about-hero .lede {
  margin: 0 0 24px;
  max-width: 46ch;
  color: rgba(255, 253, 248, 0.86);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 20px;
}

.page-about .about-hero__link {
  color: var(--paper-bright);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 253, 248, 0.45);
  padding-bottom: 2px;
  transition: border-color 0.2s var(--ease-out), color 0.2s var(--ease-out);
}

.page-about .about-hero__link:hover,
.page-about .about-hero__link:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  align-content: start;
}

.page-about .about-stat {
  padding: 16px 18px;
  background: rgba(255, 253, 248, 0.06);
  border: 1px solid rgba(255, 253, 248, 0.16);
  border-radius: 18px;
  transition: border-color 0.2s var(--ease-out), background 0.2s var(--ease-out);
}

.page-about .about-stat:hover {
  border-color: rgba(255, 107, 53, 0.55);
  background: rgba(255, 253, 248, 0.1);
}

.page-about .about-stat__num {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(22px, 3.4vw, 30px);
  line-height: 1.1;
  color: var(--orange);
}

.page-about .about-stat__label {
  font-size: 14px;
  line-height: 1.5;
  color: rgba(255, 253, 248, 0.8);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding: 52px 0;
}

.page-about .about-section__head {
  display: grid;
  gap: 10px;
  margin-bottom: 30px;
}

.page-about .about-num {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(38px, 7vw, 68px);
  line-height: 0.86;
  color: var(--orange);
}

.page-about .about-section__title {
  margin: 0 0 8px;
  font-size: clamp(24px, 3.6vw, 34px);
  line-height: 1.2;
  color: var(--ink);
}

.page-about .about-section__sub {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 竖向时间线 ---------- */
.page-about .about-timeline__body {
  display: grid;
  gap: 32px;
}

.page-about .about-track {
  position: relative;
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: var(--sand);
}

.page-about .about-track__item {
  position: relative;
  padding-left: 52px;
}

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 24px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--paper-bright);
  border: 3px solid var(--orange);
  box-sizing: border-box;
}

.page-about .about-track__node {
  padding: 14px 18px;
  background: var(--paper-bright);
  border: 1px solid var(--sand);
  border-radius: 16px;
  transition: border-color 0.2s var(--ease-out), box-shadow 0.2s var(--ease-out);
}

.page-about .about-track__node:hover {
  border-color: var(--teal);
}

.page-about .about-track__node[open] {
  border-color: var(--orange);
  box-shadow: var(--shadow-soft);
}

.page-about .about-track__node summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
  list-style: none;
  cursor: pointer;
}

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

.page-about .about-track__node summary::marker {
  content: "";
}

.page-about .about-track__year {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(24px, 4vw, 32px);
  line-height: 1;
  color: var(--ink);
}

.page-about .about-track__tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: rgba(255, 107, 53, 0.14);
  color: var(--orange-deep);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .about-track__title {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-soft);
}

.page-about .about-track__node summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
  color: var(--orange-deep);
}

.page-about .about-track__node[open] summary::after {
  content: "−";
}

.page-about .about-track__body {
  margin: 12px 0 2px;
  padding-top: 12px;
  border-top: 1px dashed var(--sand);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-track__body p {
  margin: 0;
}

/* ---------- 图注 ---------- */
.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure img {
  width: 100%;
  border-radius: var(--radius-card);
  background: var(--ink-deep);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate);
}

.page-about .about-figure--team {
  margin-top: 24px;
}

/* ---------- 内容与工具两条主线 ---------- */
.page-about .about-split {
  display: grid;
  gap: 16px;
}

.page-about .about-panel {
  padding: clamp(20px, 3vw, 28px);
  background: var(--paper-bright);
  border: 1px solid var(--sand);
  border-radius: var(--radius-card);
  transition: border-color 0.2s var(--ease-out), transform 0.2s var(--ease-out);
}

.page-about .about-panel:hover {
  transform: translateY(-2px);
  border-color: var(--teal);
}

.page-about .about-panel h3 {
  margin: 0 0 10px;
  font-size: 19px;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-panel p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 18px;
  overflow: hidden;
  background: var(--sand);
  border: 1px solid var(--sand);
  border-radius: var(--radius-card);
}

.page-about .about-facts__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px;
  background: var(--paper);
}

.page-about .about-facts__num {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 32px);
  line-height: 1;
  color: var(--ink);
}

.page-about .about-facts__label {
  font-size: 14px;
  line-height: 1.5;
  color: var(--slate);
}

/* ---------- 老用户分类 ---------- */
.page-about .callout {
  margin-top: 4px;
}

.page-about .callout p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-dirs {
  display: grid;
  gap: 10px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-dirs li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  background: var(--paper-bright);
  border: 1px solid var(--sand);
  border-radius: 14px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink);
  transition: border-color 0.2s var(--ease-out);
}

.page-about .about-dirs li:hover {
  border-color: var(--orange);
}

.page-about .about-dirs b {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--orange-deep);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 14px;
}

.page-about .about-team__card {
  position: relative;
  padding: 22px 22px 22px 26px;
  background: var(--paper-bright);
  border: 1px solid var(--sand);
  border-radius: var(--radius-card);
  transition: transform 0.2s var(--ease-out), border-color 0.2s var(--ease-out),
    box-shadow 0.2s var(--ease-out);
}

.page-about .about-team__card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  bottom: 22px;
  width: 4px;
  border-radius: 0 4px 4px 0;
  background: var(--teal);
  opacity: 0;
  transition: opacity 0.2s var(--ease-out);
}

.page-about .about-team__card:hover,
.page-about .about-team__card:focus-within {
  transform: translateY(-2px);
  border-color: var(--orange);
  box-shadow: var(--shadow-soft);
}

.page-about .about-team__card:hover::before,
.page-about .about-team__card:focus-within::before {
  opacity: 1;
}

.page-about .about-team__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
  margin-bottom: 10px;
}

.page-about .about-team__name {
  margin: 0;
  font-size: 18px;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-team__count {
  padding: 2px 10px;
  border-radius: var(--radius-pill);
  background: rgba(27, 153, 139, 0.14);
  color: var(--teal-deep);
  font-size: 13px;
  font-weight: 600;
}

.page-about .about-team__duty {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- 服务范围 ---------- */
.page-about .about-cover {
  display: grid;
  gap: 24px;
}

.page-about .about-cover__stats {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .about-cover__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--sand);
}

.page-about .about-cover__num {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(26px, 4vw, 34px);
  line-height: 1;
  color: var(--ink);
}

.page-about .about-cover__text {
  flex: 1 1 12ch;
  font-size: 15px;
  line-height: 1.6;
  color: var(--slate);
}

/* ---------- 结果信息块 ---------- */
.page-about .about-outcome {
  padding: clamp(24px, 4.5vw, 44px);
  background: var(--teal);
  color: var(--ink);
  border-radius: var(--radius-card);
}

.page-about .about-outcome h3 {
  margin: 0 0 12px;
  font-size: clamp(21px, 3vw, 26px);
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-outcome > p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-outcome__grid {
  display: grid;
  gap: 18px;
  margin-top: 24px;
  padding-top: 22px;
  border-top: 1px solid rgba(11, 37, 69, 0.24);
}

.page-about .about-outcome__num {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(26px, 4vw, 34px);
  line-height: 1;
  color: var(--ink);
}

.page-about .about-outcome__item span:last-child {
  font-size: 14px;
  line-height: 1.6;
}

/* ---------- 去向入口 ---------- */
.page-about .about-next {
  padding-bottom: 8px;
}

.page-about .about-actions {
  display: grid;
  gap: 12px;
}

.page-about .about-action {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px;
  background: var(--paper-bright);
  border: 1px solid var(--sand);
  border-radius: 18px;
  text-decoration: none;
  color: var(--ink);
  transition: transform 0.2s var(--ease-out), border-color 0.2s var(--ease-out),
    box-shadow 0.2s var(--ease-out);
}

.page-about .about-action:hover,
.page-about .about-action:focus-visible {
  transform: translateY(-2px);
  border-color: var(--orange);
  box-shadow: var(--shadow-soft);
}

.page-about .about-action__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-action__note {
  font-size: 14px;
  line-height: 1.6;
  color: var(--slate);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-dirs,
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 760px) {
  .page-about .about-section {
    padding: 68px 0;
  }

  .page-about .about-section__head {
    grid-template-columns: 112px 1fr;
    gap: 28px;
    align-items: start;
    margin-bottom: 40px;
  }

  .page-about .about-split {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

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

  .page-about .about-outcome__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: center;
    gap: 44px;
  }

  .page-about .about-timeline__body {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-cover {
    grid-template-columns: 0.8fr 1.2fr;
    align-items: center;
    gap: 40px;
  }

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