.page-about {
  overflow-x: clip;
  padding-bottom: clamp(48px, 7vw, 88px);
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding: clamp(16px, 2.6vw, 26px) 0 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding: clamp(26px, 4.5vw, 52px) 0 clamp(34px, 5vw, 62px);
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: end;
  }
}

.page-about .about-hero__intro .eyebrow {
  margin: 0;
}

.page-about .about-hero h1 {
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: clamp(29px, 5.2vw, 54px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 10px 0 0;
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 58ch;
  font-size: 16.5px;
  line-height: 1.75;
  color: rgba(232, 244, 240, 0.8);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-hero__stat {
  background: var(--panel);
  padding: clamp(14px, 2vw, 20px) clamp(11px, 1.6vw, 18px);
  display: grid;
  gap: 8px;
  align-content: start;
}

.page-about .about-hero__stat .stat__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 4.8vw, 44px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-hero__stat .stat__unit {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

/* ---------- 左轴 + 内容分栏 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(36px, 4.5vw, 64px);
  }
}

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

@media (min-width: 1024px) {
  .page-about .about-axis {
    display: block;
    position: sticky;
    top: 132px;
    align-self: start;
  }
}

.page-about .about-axis__title {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-about .about-axis__nav {
  position: relative;
  padding-left: 17px;
}

.page-about .about-axis__nav::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 1px;
  background: var(--line);
}

.page-about .about-axis__nav .index-nav__link {
  display: block;
  padding: 9px 0 9px 16px;
  margin-left: -17px;
  border-left: 2px solid transparent;
  font-size: 14px;
  line-height: 1.4;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--fast), border-color var(--fast);
}

.page-about .about-axis__nav .index-nav__link:hover {
  color: var(--ink);
}

.page-about .about-axis__nav .index-nav__link[aria-current] {
  color: var(--cyan);
  border-left-color: var(--cyan);
}

/* ---------- 章节通用 ---------- */
.page-about .about-flow .section:first-child {
  border-top: 0;
}

.page-about .about-sec {
  padding: clamp(34px, 5.5vw, 66px) 0;
}

.page-about .about-sec h2,
.page-about .about-cta h2 {
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: clamp(23px, 3.2vw, 35px);
  line-height: 1.2;
  letter-spacing: -0.005em;
  color: var(--ink);
  margin: 8px 0 0;
}

.page-about .about-sec__lede {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(232, 244, 240, 0.78);
}

.page-about .about-sec__figure {
  margin: clamp(20px, 3vw, 32px) 0 0;
  border: 1px solid var(--line);
  background: var(--panel);
}

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

.page-about .about-sec__cap {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  background: var(--panel-2);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

/* ---------- 三线分工 ---------- */
.page-about .about-lines {
  margin-top: clamp(22px, 3vw, 34px);
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

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

.page-about .about-line {
  background: var(--panel);
  padding: clamp(20px, 2.6vw, 28px);
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .about-line__no {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-line__name {
  margin: 0;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-line__scale {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .about-line__count {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 30px;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-line__unit {
  font-size: 12px;
  color: var(--muted);
}

.page-about .about-line__bar {
  height: 4px;
  background: var(--line);
  overflow: hidden;
}

.page-about .about-line__bar span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--cyan-soft));
}

.page-about .about-line__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
  font-size: 14.5px;
  line-height: 1.65;
  color: rgba(232, 244, 240, 0.74);
}

.page-about .about-line__list li {
  position: relative;
  padding-left: 14px;
}

.page-about .about-line__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 流程 ---------- */
.page-about .about-workflow {
  margin-top: clamp(22px, 3vw, 34px);
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

@media (min-width: 960px) {
  .page-about .about-workflow {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-step {
  background: var(--panel);
  padding: clamp(16px, 2.2vw, 22px) clamp(16px, 2.2vw, 24px);
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 0 14px;
  border-left: 2px solid transparent;
  transition: border-color var(--fast), background var(--fast);
}

.page-about .about-step:hover,
.page-about .about-step:focus-within {
  border-left-color: var(--cyan);
  background: var(--panel-2);
}

.page-about .about-step__no {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--orange);
  padding-top: 2px;
}

.page-about .about-step__body h3 {
  margin: 0 0 6px;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .about-step__body p {
  margin: 0 0 8px;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(232, 244, 240, 0.74);
}

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

.page-about .about-step__meta {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-about .about-workflow__side {
  display: grid;
  gap: 1px;
}

.page-about .about-workflow__figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--panel);
}

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

.page-about .about-note {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: clamp(16px, 2.2vw, 22px);
}

.page-about .about-note__k {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-note p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(232, 244, 240, 0.74);
}

/* ---------- 时间轴 ---------- */
.page-about .about-track {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0 0 0 24px;
  position: relative;
  display: grid;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--line) 42%, var(--line) 100%);
}

.page-about .about-track__item {
  position: relative;
  padding: 14px 0 18px;
  border-bottom: 1px dashed var(--line);
}

.page-about .about-track__item:last-child {
  border-bottom: 0;
  padding-bottom: 6px;
}

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 24px;
  width: 7px;
  height: 7px;
  background: var(--cyan);
}

.page-about .about-track__year {
  margin: 0 0 6px;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .about-track__name {
  margin: 0 0 6px;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .about-track__item p:last-child {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(232, 244, 240, 0.76);
}

/* ---------- 协作网络 ---------- */
.page-about .about-net {
  margin-top: clamp(22px, 3vw, 34px);
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

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

.page-about .about-net__card {
  background: var(--panel);
  padding: clamp(20px, 2.6vw, 28px);
}

.page-about .about-net__count {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(30px, 4.4vw, 44px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-net__label {
  margin: 10px 0 10px;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: 16px;
  color: var(--ink);
}

.page-about .about-net__card p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(232, 244, 240, 0.74);
}

.page-about .about-volunteer {
  margin-top: clamp(18px, 2.4vw, 26px);
  border: 1px solid var(--line);
  border-top: 2px solid var(--cyan);
  background: var(--panel-2);
  padding: clamp(22px, 3vw, 32px);
  display: grid;
  gap: 20px;
}

@media (min-width: 860px) {
  .page-about .about-volunteer {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
  }
}

.page-about .about-volunteer .eyebrow {
  margin: 0;
}

.page-about .about-volunteer h3 {
  margin: 6px 0 10px;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-volunteer p:last-child {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.74;
  color: rgba(232, 244, 240, 0.76);
}

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

/* ---------- 日常节奏 ---------- */
.page-about .about-rhythm {
  margin-top: clamp(22px, 3vw, 34px);
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 800px) {
  .page-about .about-rhythm {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }
}

.page-about .about-rhythm__col {
  background: var(--panel);
  padding: clamp(20px, 2.8vw, 30px);
}

.page-about .about-rhythm__col h3 {
  margin: 0 0 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: 19px;
  color: var(--ink);
}

.page-about .about-rhythm__col ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-rhythm__col li {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 14px;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(232, 244, 240, 0.76);
}

.page-about .about-rhythm__t {
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--cyan);
  padding-top: 3px;
}

@media (max-width: 520px) {
  .page-about .about-rhythm__col li {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .page-about .about-rhythm__t {
    padding-top: 0;
  }
}

/* ---------- 收尾行动区 ---------- */
.page-about .about-cta {
  margin-top: clamp(34px, 5.5vw, 66px);
  padding: clamp(24px, 3.6vw, 40px);
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  background:
    linear-gradient(120deg, rgba(47, 240, 196, 0.09) 0%, rgba(6, 26, 22, 0) 58%),
    var(--panel);
  display: grid;
  gap: 16px;
}

.page-about .about-cta p {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(232, 244, 240, 0.78);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

/* ---------- 动效收敛 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-step,
  .page-about .about-axis__nav .index-nav__link {
    transition: none;
  }
}
</PAGE_CSS>>