/* ============ page-about ============ */

.page-about {
  --about-lead: 17px;
  --about-body: 16.5px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line-200);
}

.page-about .about-hero::before,
.page-about .about-hero::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}

.page-about .about-hero::before {
  top: -110px;
  right: -70px;
  width: 280px;
  height: 280px;
  border: 1px solid rgba(255, 107, 26, .28);
}

.page-about .about-hero::after {
  top: -220px;
  right: -170px;
  width: 500px;
  height: 500px;
  border: 1px dashed var(--line-200);
}

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

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 52px);
  margin-top: 26px;
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: end;
  }
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(32px, 5vw, 54px);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--ink-900);
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 60ch;
  font-size: var(--about-lead);
  line-height: 1.78;
  color: var(--ink-700);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-200);
  border: 1px solid var(--line-200);
  border-radius: var(--r-m);
  overflow: hidden;
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 16px;
  background: var(--paper-0);
}

.page-about .about-hero__num {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 30px;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--orange-deep);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__unit {
  font-style: normal;
  font-size: .52em;
  margin-left: 2px;
  font-weight: 700;
}

.page-about .about-hero__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink-700);
}

/* ---------- 通用分栏 ---------- */

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 34px);
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 3fr);
    gap: clamp(40px, 4.6vw, 64px);
    align-items: start;
  }

  .page-about .about-aside {
    position: sticky;
    top: 40px;
  }
}

.page-about .about-num {
  display: block;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(54px, 8vw, 102px);
  line-height: .84;
  letter-spacing: -.05em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

@supports ((-webkit-text-stroke: 1px #000) or (text-stroke: 1px #000)) {
  .page-about .about-num {
    color: transparent;
    -webkit-text-stroke: 1.5px var(--orange);
    text-stroke: 1.5px var(--orange);
  }
}

.page-about .about-h2 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(23px, 3vw, 32px);
  line-height: 1.22;
  letter-spacing: -.01em;
  color: var(--ink-900);
}

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

.page-about .about-main > * + * {
  margin-top: 26px;
}

.page-about .about-p {
  margin: 0;
  max-width: 66ch;
  font-size: var(--about-body);
  line-height: 1.8;
  color: var(--ink-700);
}

.page-about .about-p--lead {
  font-size: var(--about-lead);
  color: var(--ink-900);
  max-width: 62ch;
}

.page-about .about-p--drop::first-letter {
  float: left;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 3.2em;
  line-height: .9;
  letter-spacing: -.04em;
  color: var(--orange);
  margin: 6px 12px 0 0;
}

.page-about .about-figure,
.page-about .about-team-figure,
.page-about .about-orbit-figure {
  margin: 0;
  border-radius: var(--r-m);
  overflow: hidden;
  border: 1px solid var(--line-200);
  background: var(--paper-1);
}

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

.page-about .about-figure .media__caption,
.page-about .about-team-figure .media__caption,
.page-about .about-orbit-figure .media__caption {
  padding: 12px 18px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-700);
  border-top: 1px solid var(--line-200);
  background: var(--paper-0);
}

.page-about .about-orbit-figure {
  max-width: 440px;
  margin-left: auto;
  margin-right: auto;
}

/* ---------- 时间轴 ---------- */

.page-about .timeline {
  margin-top: 10px;
  border-top: 1px solid var(--line-200);
}

.page-about .timeline__item {
  position: relative;
  padding-left: 74px;
  border-bottom: 1px solid var(--line-200);
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 27px;
  top: 62px;
  bottom: -1px;
  width: 2px;
  background: var(--line-200);
}

.page-about .timeline__item:last-child::before {
  display: none;
}

.page-about .timeline__trigger {
  position: relative;
  display: flex;
  align-items: center;
  gap: 18px;
  width: 100%;
  padding: 20px 0;
  margin: 0;
  border: 0;
  background: none;
  font: inherit;
  color: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .timeline__star {
  flex: 0 0 auto;
  width: 56px;
  height: 56px;
  margin-left: -74px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 2px solid var(--line-200);
  background: var(--paper-0);
  color: var(--ink-700);
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 17px;
  transition: background var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease),
              color var(--t-fast) var(--ease);
}

.page-about .timeline__trigger:hover .timeline__star,
.page-about .timeline__item[data-open] .timeline__star,
.page-about .timeline__item.is-open .timeline__star {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink-900);
}

.page-about .timeline__meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .timeline__when {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--orange-deep);
  font-variant-numeric: tabular-nums;
}

.page-about .timeline__name {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 900;
  line-height: 1.4;
  color: var(--ink-900);
}

.page-about .timeline__chev {
  margin-left: auto;
  flex: 0 0 auto;
  font-size: 13px;
  color: var(--line-200);
  transition: transform var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.page-about .timeline__item[data-open] .timeline__chev,
.page-about .timeline__item.is-open .timeline__chev {
  transform: rotate(90deg);
  color: var(--orange);
}

.page-about .timeline__body .timeline__inner {
  margin: 0 0 24px;
  padding-left: 20px;
  border-left: 2px solid var(--orange);
  max-width: 64ch;
}

.page-about .timeline__body .timeline__inner p {
  margin: 0;
  font-size: var(--about-body);
  line-height: 1.8;
  color: var(--ink-700);
}

/* ---------- 团队分工 ---------- */

.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

@media (min-width: 760px) {
  .page-about .team-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .team-card:nth-child(1) { grid-column: span 7; }
  .page-about .team-card:nth-child(2) { grid-column: span 5; }
  .page-about .team-card:nth-child(3) { grid-column: span 5; }
  .page-about .team-card:nth-child(4) { grid-column: span 7; }
}

.page-about .team-card {
  position: relative;
  padding: 24px 22px 22px;
  background: var(--paper-0);
  border: 1px solid var(--line-200);
  border-radius: var(--r-m);
  box-shadow: var(--shadow-1);
  transition: border-color var(--t-fast) var(--ease),
              transform var(--t-fast) var(--ease),
              box-shadow var(--t-fast) var(--ease);
}

.page-about .team-card:hover {
  border-color: var(--orange);
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
}

.page-about .team-card__mark {
  display: block;
  width: 22px;
  height: 22px;
  margin: 0 0 16px;
}

.page-about .team-card--a .team-card__mark {
  border-radius: 50%;
  background: var(--orange);
}

.page-about .team-card--b .team-card__mark {
  border-radius: 4px;
  background: var(--green);
}

.page-about .team-card--c .team-card__mark {
  width: 16px;
  height: 16px;
  margin: 3px 0 19px 3px;
  border-radius: 2px;
  background: var(--blue);
  transform: rotate(45deg);
}

.page-about .team-card--d .team-card__mark {
  background: var(--gold);
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
}

.page-about .team-card__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 900;
  line-height: 1.3;
  color: var(--ink-900);
}

.page-about .team-card__text {
  margin: 10px 0 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--ink-700);
}

.page-about .team-card__meta {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line-200);
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-700);
}

/* ---------- 维护节奏 ---------- */

.page-about .ledger {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  height: 76px;
  margin-top: 8px;
  padding: 0 2px;
  border-bottom: 1px solid var(--line-200);
}

.page-about .ledger__tick {
  flex: 1 1 0;
  min-width: 3px;
  height: 16px;
  border-radius: 2px 2px 0 0;
  background: var(--line-200);
}

.page-about .ledger__tick:nth-child(3n) { height: 26px; }
.page-about .ledger__tick:nth-child(4n) { height: 20px; }
.page-about .ledger__tick:nth-child(5n) { height: 36px; }
.page-about .ledger__tick:nth-child(7n) { height: 48px; }
.page-about .ledger__tick:nth-child(11n) { height: 58px; background: var(--orange); }
.page-about .ledger__tick:last-child { height: 64px; background: var(--green); }

.page-about .ledger__caption {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-700);
}

.page-about .ledger__caption strong {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 18px;
  color: var(--orange-deep);
  font-variant-numeric: tabular-nums;
}

.page-about .cadence {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-200);
  border: 1px solid var(--line-200);
  border-radius: var(--r-m);
  overflow: hidden;
}

.page-about .cadence li {
  display: grid;
  gap: 8px;
  padding: 20px 22px;
  background: var(--paper-0);
}

@media (min-width: 720px) {
  .page-about .cadence li {
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

.page-about .cadence__k {
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 900;
  letter-spacing: .04em;
  color: var(--orange-deep);
}

.page-about .cadence__t {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--ink-700);
  max-width: 64ch;
}

/* ---------- 同行者 ---------- */

.page-about .persona {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-200);
}

.page-about .persona__row {
  display: grid;
  gap: 12px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line-200);
}

@media (min-width: 760px) {
  .page-about .persona__row {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }
}

.page-about .persona__tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 900;
  line-height: 1.5;
  color: var(--ink-900);
}

.page-about .persona__tag::before {
  content: "";
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--orange);
}

.page-about .persona__row:nth-child(2) .persona__tag::before { background: var(--green); }
.page-about .persona__row:nth-child(3) .persona__tag::before { background: var(--blue); }
.page-about .persona__row:nth-child(4) .persona__tag::before { background: var(--gold); }

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

.page-about .persona__text {
  margin: 0;
  max-width: 64ch;
  font-size: var(--about-body);
  line-height: 1.8;
  color: var(--ink-700);
}

.page-about .persona__data {
  display: inline-block;
  margin: 12px 0 0;
  padding: 6px 14px;
  border-radius: var(--r-full);
  border: 1px solid var(--line-200);
  background: var(--paper-1);
  font-size: 13px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink-900);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 24px;
}

@media (min-width: 860px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-stat {
  padding-left: 16px;
  border-left: 3px solid var(--line-200);
}

.page-about .about-stat:nth-child(1) { border-left-color: var(--orange); }
.page-about .about-stat:nth-child(2) { border-left-color: var(--green); }
.page-about .about-stat:nth-child(3) { border-left-color: var(--blue); }
.page-about .about-stat:nth-child(4) { border-left-color: var(--gold); }

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 27px;
  line-height: 1.1;
  color: var(--ink-900);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ink-700);
}

/* ---------- 收尾 ---------- */

.page-about .about-next {
  position: relative;
  overflow: hidden;
}

.page-about .about-next::before {
  content: "";
  position: absolute;
  right: -160px;
  bottom: -190px;
  width: 440px;
  height: 440px;
  border-radius: 50%;
  border: 1px dashed rgba(245, 183, 49, .3);
  pointer-events: none;
  animation: about-orbit 72s linear infinite;
}

.page-about .about-next .wrap {
  position: relative;
  z-index: 1;
}

@keyframes about-orbit {
  to { transform: rotate(360deg); }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-next::before {
    animation: none;
  }

  .page-about .team-card:hover {
    transform: none;
  }
}

.page-about .about-next__eyebrow {
  color: var(--gold);
}

.page-about .about-next__title {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--paper-0);
}

.page-about .about-next__lead {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: var(--about-lead);
  line-height: 1.8;
  color: rgba(251, 250, 247, .8);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-routes {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

@media (min-width: 720px) {
  .page-about .about-routes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

.page-about .about-routes a {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  border: 1px solid rgba(251, 250, 247, .18);
  border-radius: var(--r-m);
  text-decoration: none;
  transition: border-color var(--t-fast) var(--ease),
              background var(--t-fast) var(--ease);
}

.page-about .about-routes a:hover,
.page-about .about-routes a:focus-visible {
  border-color: var(--orange);
  background: rgba(255, 107, 26, .1);
}

.page-about .about-routes__label {
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 900;
  line-height: 1.4;
  color: var(--paper-0);
}

.page-about .about-routes__desc {
  font-size: 13.5px;
  line-height: 1.65;
  color: rgba(251, 250, 247, .72);
}

/* ---------- 窄屏收口 ---------- */

@media (max-width: 480px) {
  .page-about .about-hero__facts {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-num {
    font-size: 48px;
  }

  .page-about .timeline__item {
    padding-left: 56px;
  }

  .page-about .timeline__star {
    width: 44px;
    height: 44px;
    margin-left: -56px;
    font-size: 15px;
  }

  .page-about .timeline__item::before {
    left: 21px;
    top: 54px;
  }

  .page-about .timeline__name {
    font-size: 16px;
  }

  .page-about .about-p--drop::first-letter {
    font-size: 2.4em;
  }
}