.page-about {
  --about-text: #C9D5E9;
  --about-gap: clamp(24px, 4vw, 48px);
  --about-rail-top: calc(var(--header-h) + 32px);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: hidden;
}

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

.page-about .about-crumb {
  padding-top: clamp(18px, 3vw, 30px);
  padding-bottom: clamp(8px, 1.4vw, 14px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(36px, 6vw, 88px) 0 clamp(64px, 9vw, 132px);
  background:
    radial-gradient(120% 90% at 12% 0%, rgba(125, 240, 74, .10) 0%, rgba(125, 240, 74, 0) 55%),
    linear-gradient(160deg, var(--ink-2) 0%, var(--ink) 78%);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 calc(100% - 40px));
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -30%;
  right: -12%;
  width: 62%;
  height: 160%;
  background: linear-gradient(118deg, transparent 0 46%, rgba(47, 182, 255, .16) 46% 50%, transparent 50% 100%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-hero__eyebrow {
  color: var(--lime);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(40px, 10vw, 88px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  max-width: 54ch;
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.78;
  color: var(--about-text);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(28px, 4vw, 46px);
  border: 1px solid var(--edge);
  background: var(--edge);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 18px;
  background: var(--ink-2);
}

.page-about .about-fact__num {
  font-size: clamp(20px, 2.8vw, 30px);
  color: var(--lime);
  letter-spacing: -0.02em;
}

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

.page-about .about-hero__aside {
  padding-top: 22px;
  border-top: 1px solid var(--edge);
}

.page-about .about-hero__aside-title {
  margin: 0 0 12px;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--blue);
}

.page-about .about-hero__aside-text {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-hero__aside-text:last-child {
  margin-bottom: 0;
}

/* ---------- 杂志式双栏 ---------- */
.page-about .about-grid {
  row-gap: clamp(36px, 5vw, 64px);
}

.page-about .about-rail__label {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--muted-2);
}

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

.page-about .about-rail__list li {
  border-top: 1px solid var(--edge);
}

.page-about .about-rail__list li:last-child {
  border-bottom: 1px solid var(--edge);
}

.page-about .about-rail__list a {
  display: block;
  padding: 9px 0;
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--lime);
  padding-left: 6px;
}

.page-about .about-rail__note {
  margin-top: 28px;
}

.page-about .about-rail__num {
  margin: 0;
  font-size: clamp(28px, 3.4vw, 36px);
  color: var(--lime);
  letter-spacing: -0.02em;
}

.page-about .about-rail__cap {
  margin: 4px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-chapter + .about-chapter {
  margin-top: clamp(56px, 8vw, 112px);
}

.page-about .about-lede {
  margin: 0 0 clamp(22px, 3vw, 34px);
  max-width: 62ch;
  color: var(--about-text);
}

.page-about .about-prose p {
  margin: 0 0 1.2em;
  font-size: 17px;
  line-height: 1.8;
  color: var(--about-text);
}

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

.page-about .about-prose--after {
  margin-top: clamp(24px, 3.4vw, 38px);
}

.page-about .about-textrow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 36px);
  align-items: center;
}

.page-about .about-inline-link {
  margin: clamp(20px, 3vw, 30px) 0 0;
  font-size: 15px;
}

.page-about .about-inline-link a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 182, 255, .4);
  padding-bottom: 2px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-inline-link a:hover,
.page-about .about-inline-link a:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
}

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

.page-about .about-media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  border: 1px solid var(--edge);
  background: var(--panel);
}

.page-about .about-media--wide {
  aspect-ratio: 2 / 1;
}

.page-about .about-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 320ms var(--ease);
}

.page-about .about-figure:hover .about-media img {
  transform: scale(1.02);
}

.page-about .about-figure .media-caption {
  margin-top: 12px;
  font-size: 13px;
  color: var(--muted-2);
}

.page-about .about-figure--wide {
  margin-bottom: clamp(24px, 3.6vw, 40px);
}

/* ---------- 引文 ---------- */
.page-about .about-quote {
  margin: clamp(28px, 4vw, 46px) 0;
  padding: clamp(22px, 3vw, 32px) clamp(22px, 3vw, 34px);
  border: 1px solid var(--edge);
  border-left: 3px solid var(--lime);
  background: linear-gradient(90deg, var(--lime-soft) 0%, rgba(6, 11, 20, 0) 78%);
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.4vw, 26px);
  line-height: 1.5;
  letter-spacing: -0.01em;
  color: var(--paper);
}

/* ---------- 四步流程 ---------- */
.page-about .about-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--edge);
  border: 1px solid var(--edge);
}

.page-about .about-step {
  padding: 24px 22px 26px;
  background: var(--ink-2);
  transition: background-color var(--dur) var(--ease);
}

.page-about .about-step:hover {
  background: var(--panel);
}

.page-about .about-step__idx {
  display: block;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--blue);
}

.page-about .about-step__title {
  margin: 10px 0 8px;
  font-size: 17px;
  color: var(--paper);
}

.page-about .about-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-rhythm {
  padding-block: clamp(56px, 8vw, 112px);
  border-top: 1px solid var(--edge);
  border-bottom: 1px solid var(--edge);
  background: var(--ink-2);
}

.page-about .about-rhythm__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

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

.page-about .about-cadence__item {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 20px;
  background: var(--ink);
}

.page-about .about-cadence__key {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--blue);
  padding-top: 2px;
}

.page-about .about-cadence__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-text);
}

/* ---------- 时间线 ---------- */
.page-about .about-track {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(238px, 1fr);
  gap: 1px;
  background: var(--edge);
  border-top: 1px solid var(--edge);
  border-bottom: 1px solid var(--edge);
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-node {
  padding: 26px 22px 30px;
  background: var(--ink-2);
  border-top: 2px solid var(--edge);
  outline: none;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-node:hover,
.page-about .about-node:focus-visible,
.page-about .about-node:focus-within {
  border-top-color: var(--lime);
  background: var(--panel);
  transform: translateY(-3px);
}

.page-about .about-node:focus-visible {
  box-shadow: inset 0 0 0 2px var(--blue);
}

.page-about .about-node__year {
  display: block;
  font-size: clamp(24px, 3vw, 32px);
  letter-spacing: -0.02em;
  color: var(--lime);
}

.page-about .about-node__title {
  margin: 10px 0 8px;
  font-size: 17px;
  color: var(--paper);
}

.page-about .about-node__summary {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  transition: color var(--dur) var(--ease);
}

/* ---------- 合作 ---------- */
.page-about .about-partner {
  padding-block: clamp(56px, 8vw, 112px);
}

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

.page-about .about-coop {
  padding: 28px 24px 32px;
  background: var(--ink-2);
  transition: background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-coop:hover {
  background: var(--panel);
  transform: translateY(-3px);
}

.page-about .about-coop__idx {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--orange);
}

.page-about .about-coop__title {
  margin: 12px 0 10px;
  font-size: 18px;
  color: var(--paper);
}

.page-about .about-coop p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-contact-line {
  margin-top: clamp(24px, 3.4vw, 36px);
  padding: 22px 24px;
  border: 1px solid var(--edge);
  border-left: 3px solid var(--blue);
  background: var(--panel);
}

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

.page-about .about-contact-line__link {
  margin-top: 14px;
}

.page-about .about-contact-line__link a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 182, 255, .4);
}

.page-about .about-contact-line__link a:hover,
.page-about .about-contact-line__link a:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  border-top: 1px solid var(--edge);
  padding-block: clamp(48px, 7vw, 96px);
  background: linear-gradient(150deg, var(--ink-2) 0%, var(--ink) 70%);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 36px);
  align-items: center;
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.6vw, 42px);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--muted);
}

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

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

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

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

@media (min-width: 980px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
    gap: clamp(36px, 5vw, 76px);
  }

  .page-about .about-hero__aside {
    padding: 0 0 6px 28px;
    border-top: 0;
    border-left: 1px solid var(--edge);
  }

  .page-about .about-textrow {
    grid-template-columns: minmax(0, 5fr) minmax(0, 4fr);
  }

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

  .page-about .about-rhythm__body {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }

  .page-about .about-track {
    grid-auto-flow: row;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    overflow-x: visible;
  }

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

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

@media (min-width: 1024px) {
  .page-about .about-rail {
    position: sticky;
    top: var(--about-rail-top);
    align-self: start;
  }
}

@media (hover: hover) and (min-width: 1024px) {
  .page-about .about-node__summary {
    max-height: 3.1em;
    overflow: hidden;
    transition: max-height 240ms var(--ease), color var(--dur) var(--ease);
  }

  .page-about .about-node:hover .about-node__summary,
  .page-about .about-node:focus-visible .about-node__summary,
  .page-about .about-node:focus-within .about-node__summary {
    max-height: 14em;
    color: var(--about-text);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-coop,
  .page-about .about-media img,
  .page-about .about-node__summary {
    transition: none;
    transform: none;
  }

  .page-about .about-node:hover,
  .page-about .about-coop:hover {
    transform: none;
  }

  .page-about .about-figure:hover .about-media img {
    transform: none;
  }
}