.page-about {
  --about-max: 1180px;
  --about-gutter: clamp(20px, 5vw, 56px);
  --about-hair: rgba(8, 28, 23, 0.12);
  background: var(--paper-100);
  color: var(--ink-900);
  overflow-x: clip;
}

.page-about .about-shell {
  max-width: var(--about-max);
  margin: 0 auto;
  padding: clamp(24px, 5vw, 52px) var(--about-gutter) clamp(48px, 8vw, 96px);
}

.page-about .breadcrumb {
  margin-bottom: clamp(20px, 4vw, 36px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gray-500);
}

.page-about .about-hero__title {
  margin: 12px 0 20px;
  font-family: var(--font-display);
  font-size: clamp(34px, 5.6vw, 70px);
  line-height: 1.04;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .about-hero__lede .lead {
  margin: 0;
  max-width: 48ch;
  font-family: var(--font-body);
  font-size: clamp(16px, 1.4vw, 18px);
  line-height: 1.75;
  color: var(--gray-500);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-hero__board {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 3vw, 34px);
  background: linear-gradient(158deg, var(--ink-700) 0%, var(--ink-900) 72%);
  color: var(--white);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 32px), calc(100% - 32px) 100%, 0 100%);
}

.page-about .about-hero__board::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan-400), rgba(46, 230, 197, 0) 72%);
}

.page-about .about-hero__board::after {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -90px;
  width: 220px;
  height: 220px;
  border: 1px solid var(--line-soft);
  transform: rotate(38deg);
  pointer-events: none;
}

.page-about .board__kicker {
  position: relative;
  z-index: 1;
  margin: 0 0 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan-400);
}

.page-about .board__list {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .board__list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .board__list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .board__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.2vw, 38px);
  line-height: 1;
  color: var(--amber-400);
}

.page-about .board__unit {
  font-size: 0.5em;
  margin-left: 2px;
}

.page-about .board__label {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(252, 251, 247, 0.82);
}

.page-about .board__foot {
  position: relative;
  z-index: 1;
  margin: 22px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(252, 251, 247, 0.62);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  position: relative;
  margin-top: clamp(48px, 7vw, 92px);
  padding-top: clamp(28px, 4vw, 48px);
  border-top: 1px solid var(--paper-400);
}

.page-about .about-section::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: clamp(48px, 10vw, 120px);
  height: 2px;
  background: var(--cyan-400);
}

.page-about .about-section__head {
  max-width: 60ch;
  margin-bottom: clamp(22px, 3.5vw, 36px);
}

.page-about .about-h2 {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-size: clamp(26px, 3.4vw, 44px);
  line-height: 1.12;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .about-section__intro {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--gray-500);
}

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

.page-about .about-figure .media-frame {
  width: 100%;
  background: var(--ink-800);
  overflow: hidden;
}

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

.page-about .about-figure--wide .media-frame {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 40px), calc(100% - 40px) 100%, 0 100%);
}

.page-about .about-figure--wide {
  margin: clamp(20px, 3vw, 32px) 0 clamp(26px, 4vw, 42px);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--gray-500);
}

/* ---------- 时间轴 ---------- */
.page-about .season-list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 clamp(18px, 3vw, 30px);
  border-left: 1px solid var(--paper-400);
}

.page-about .season {
  position: relative;
}

.page-about .season::before {
  content: "";
  position: absolute;
  left: calc(-1 * clamp(18px, 3vw, 30px) - 4.5px);
  top: 26px;
  width: 8px;
  height: 8px;
  background: var(--paper-100);
  border: 1px solid var(--ink-700);
  transform: rotate(45deg);
}

.page-about .season__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px 14px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
  border-bottom: 1px solid var(--paper-200);
}

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

.page-about .season__summary:focus-visible {
  outline: 2px solid var(--ink-700);
  outline-offset: 4px;
}

.page-about .season__no {
  display: inline-block;
  padding: 3px 8px;
  background: var(--amber-100);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .season__title {
  font-family: var(--font-display);
  font-size: clamp(18px, 2.2vw, 24px);
  font-weight: 500;
  line-height: 1.3;
  color: var(--ink-900);
}

.page-about .season__chev {
  width: 12px;
  height: 12px;
  border-right: 1.5px solid var(--ink-700);
  border-bottom: 1.5px solid var(--ink-700);
  transform: rotate(45deg);
  transition: transform 0.25s var(--ease);
}

.page-about .season__item[open] .season__chev {
  transform: rotate(-135deg);
}

.page-about .season__body {
  padding: 14px 0 22px;
  max-width: 64ch;
}

.page-about .season__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--gray-500);
}

/* ---------- 团队分工 ---------- */
.page-about .crew-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 40px);
  align-items: start;
}

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

.page-about .crew {
  display: grid;
  grid-template-columns: 16px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 12px;
  border-bottom: 1px solid var(--paper-200);
  transition: background-color 0.25s var(--ease);
}

.page-about .crew:first-child {
  border-top: 1px solid var(--paper-200);
}

.page-about .crew:hover,
.page-about .crew:focus-within {
  background: linear-gradient(90deg, var(--amber-100), rgba(247, 230, 196, 0) 78%);
}

.page-about .crew__key {
  align-self: start;
  justify-self: start;
  width: 14px;
  height: 14px;
  margin-top: 6px;
  background: var(--cyan-400);
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
}

.page-about .crew__key--b {
  background: var(--amber-400);
}

.page-about .crew__key--c {
  background: var(--ink-700);
}

.page-about .crew__key--d {
  background: var(--paper-400);
}

.page-about .crew__key--e {
  background: var(--ink-900);
}

.page-about .crew__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 8px;
}

.page-about .crew__count {
  padding: 2px 8px;
  background: var(--paper-200);
  color: var(--ink-700);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .crew__name {
  font-family: var(--font-display);
  font-size: clamp(19px, 2.2vw, 24px);
  font-weight: 500;
  color: var(--ink-900);
}

.page-about .crew__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--gray-500);
}

/* ---------- 方法 ---------- */
.page-about .method-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .method {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-top: 1px solid var(--paper-200);
}

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

.page-about .method__no {
  align-self: start;
  padding-bottom: 3px;
  border-bottom: 2px solid var(--cyan-400);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-700);
}

.page-about .method__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 500;
  line-height: 1.32;
  color: var(--ink-900);
}

.page-about .method__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--gray-500);
}

/* ---------- 合作生态 ---------- */
.page-about .partners__panel {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 48px);
  background: linear-gradient(152deg, var(--ink-800) 0%, var(--ink-900) 68%);
  color: var(--white);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 36px), calc(100% - 36px) 100%, 0 100%);
}

.page-about .partners__panel::after {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -90px;
  width: 280px;
  height: 280px;
  transform: rotate(42deg);
  background: linear-gradient(135deg, rgba(46, 230, 197, 0.18), rgba(46, 230, 197, 0));
  pointer-events: none;
}

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

.page-about .partners__panel .eyebrow {
  color: var(--cyan-400);
}

.page-about .partners__title {
  margin: 12px 0 14px;
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 500;
  line-height: 1.15;
  color: var(--white);
}

.page-about .partners__intro {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(252, 251, 247, 0.8);
}

.page-about .partners__stats {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .partners__stats li {
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
}

.page-about .partners__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1;
  color: var(--amber-400);
}

.page-about .partners__label {
  display: block;
  font-size: 14px;
  line-height: 1.62;
  color: rgba(252, 251, 247, 0.82);
}

.page-about .partners__honor {
  margin: clamp(24px, 4vw, 34px) 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line-dark);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.05em;
  line-height: 1.7;
  color: var(--cyan-200);
}

/* ---------- 服务日常 ---------- */
.page-about .daily-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-about .daily {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-top: 1px solid var(--paper-200);
}

.page-about .daily__when {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-700);
}

.page-about .daily__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--gray-500);
}

/* ---------- 延伸入口 ---------- */
.page-about .next-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .next-list a {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--paper-200);
  color: var(--ink-900);
  text-decoration: none;
}

.page-about .next-list li:last-child a {
  border-bottom: 1px solid var(--paper-200);
}

.page-about .next__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gray-500);
}

.page-about .next__label {
  font-family: var(--font-display);
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 500;
  line-height: 1.4;
}

.page-about .next__arrow {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--ink-700);
  transition: transform 0.22s var(--ease);
}

.page-about .next-list a:hover .next__label,
.page-about .next-list a:focus-visible .next__label {
  color: var(--ink-700);
}

.page-about .next-list a:hover .next__arrow,
.page-about .next-list a:focus-visible .next__arrow {
  transform: translateX(6px);
}

.page-about .next-list a:focus-visible {
  outline: 2px solid var(--ink-700);
  outline-offset: 4px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .partners__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .daily-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 4vw, 48px);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .crew-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(28px, 4vw, 48px);
  }

  .page-about .about-figure--crew {
    position: sticky;
    top: calc(var(--bar-h, 60px) + 24px);
  }

  .page-about .about-method {
    display: grid;
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: clamp(24px, 5vw, 64px);
    align-items: start;
  }

  .page-about .about-method .about-section__head {
    margin-bottom: 0;
  }
}

@media (min-width: 1100px) {
  .page-about .day-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .season__chev,
  .page-about .next__arrow,
  .page-about .crew {
    transition: none;
  }
}