/* ============ 品牌档案 · /profile/ ============ */

.page-about {
  background: var(--ink);
  color: var(--paper);
  overflow-x: clip;
}

.page-about .page-about__crumb {
  padding-top: 26px;
}

/* ---------- 通用区块骨架 ---------- */

.page-about .page-block {
  padding-block: 56px;
  border-top: 1px solid var(--line);
}

.page-about .page-block--dark {
  background: var(--ink-deep);
}

.page-about .block-head {
  display: grid;
  gap: 14px;
  margin-bottom: 36px;
  max-width: 72ch;
}

.page-about .block-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4.2vw, 40px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .block-head p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--steel);
}

/* ---------- 开篇 ---------- */

.page-about .page-about__open {
  padding-block: 38px 60px;
}

.page-about .about-open__grid {
  display: grid;
  gap: 36px;
}

.page-about .about-open__title {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(36px, 7.4vw, 88px);
  line-height: 0.99;
  letter-spacing: -0.022em;
  color: var(--paper);
}

.page-about .about-open__lead {
  margin: 26px 0 0;
  max-width: 44ch;
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.72;
  color: var(--paper);
}

.page-about .about-open__sub {
  margin: 16px 0 0;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .about-open__meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 32px 0 0;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-open__meta > div {
  background: var(--ink);
  padding: 14px 16px;
}

.page-about .about-open__meta dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--steel);
}

.page-about .about-open__meta dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.8vw, 28px);
  font-weight: 700;
  line-height: 1;
  color: var(--mint);
}

.page-about .about-open__figure {
  border: 2px solid var(--line-strong);
  box-shadow: var(--shadow-cool);
}

/* ---------- 受众场景 ---------- */

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

.page-about .about-audience__row {
  display: grid;
  gap: 8px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-audience__row:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-audience__role {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .about-audience__text {
  margin: 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--paper);
}

/* ---------- 版本时间轴 ---------- */

.page-about .about-versions__banner {
  border: 2px solid var(--line-strong);
  margin: 0 0 40px;
}

.page-about .about-versions {
  display: grid;
  gap: 28px;
}

.page-about .about-years__list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-years__item {
  flex: 0 0 auto;
}

.page-about .about-years__link {
  display: inline-block;
  padding: 7px 12px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--steel);
  text-decoration: none;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-years__link:hover,
.page-about .about-years__link:focus-visible {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-years__link[aria-current="true"] {
  color: var(--ink);
  background: var(--orange);
  border-color: var(--orange);
}

.page-about .about-versions__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
}

.page-about .about-versions__list::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--orange), var(--cyan) 52%, var(--mint));
  opacity: 0.6;
}

.page-about .about-version {
  position: relative;
  padding-bottom: 44px;
}

.page-about .about-version:last-child {
  padding-bottom: 0;
}

.page-about .about-version__dot {
  position: absolute;
  left: -26px;
  top: 10px;
  width: 14px;
  height: 14px;
  background: var(--orange);
  border: 3px solid var(--ink-deep);
}

.page-about .about-version__head {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.page-about .about-version__year {
  display: inline-block;
  padding: 8px 14px;
  background: var(--amber);
  color: var(--ink);
  border: 2px solid var(--ink);
  box-shadow: 4px 4px 0 rgba(53, 224, 176, 0.32);
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.2vw, 38px);
  font-weight: 700;
  line-height: 1;
}

.page-about .about-version__title {
  margin: 16px 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.6vw, 27px);
  line-height: 1.24;
  color: var(--paper);
}

.page-about .about-version__text {
  margin: 0;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .about-version__more {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mint);
  transition: max-height 0.3s ease, opacity 0.3s ease, margin-top 0.3s ease;
}

/* ---------- 团队分工 ---------- */

.page-about .about-team {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 30px;
}

.page-about .about-team__item {
  display: grid;
  gap: 10px;
}

.page-about .about-team__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

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

.page-about .about-team__count {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .about-team__track {
  height: 14px;
  background: rgba(238, 242, 248, 0.07);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-team__fill {
  display: block;
  height: 100%;
  width: 0;
  transition: width 0.5s ease;
}

.page-about .about-team__fill--44 { width: 44%; }
.page-about .about-team__fill--29 { width: 29%; }
.page-about .about-team__fill--22 { width: 22%; }
.page-about .about-team__fill--5  { width: 5%; }

.page-about .about-team__item:nth-child(1) .about-team__fill { background: var(--orange); }
.page-about .about-team__item:nth-child(2) .about-team__fill { background: var(--cyan); }
.page-about .about-team__item:nth-child(3) .about-team__fill { background: var(--mint); }
.page-about .about-team__item:nth-child(4) .about-team__fill { background: var(--amber); }

.page-about .about-team__note {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--steel);
}

/* ---------- 数据工序 ---------- */

.page-about .about-source__grid {
  display: grid;
  gap: 36px;
}

.page-about .about-source__figure {
  border: 2px solid var(--line-strong);
}

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

.page-about .about-flow__step {
  position: relative;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-flow__step:first-child {
  border-top: none;
  padding-top: 0;
}

.page-about .about-flow__num {
  display: inline-block;
  padding: 3px 9px;
  background: var(--cyan);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.page-about .about-flow__title {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.2vw, 23px);
  color: var(--paper);
}

.page-about .about-flow__text {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--steel);
}

.page-about .about-flow__arrow {
  display: block;
  width: 20px;
  height: 20px;
  margin-top: 12px;
  color: var(--line-strong);
}

.page-about .about-flow__step:last-child .about-flow__arrow {
  display: none;
}

/* ---------- 合作生态 ---------- */

.page-about .about-ecosystem {
  border: 2px solid var(--line-strong);
  border-left: 6px solid var(--mint);
  box-shadow: var(--shadow);
  background: var(--ink-deep);
  padding: 24px 22px;
}

.page-about .about-ecosystem__title {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mint);
}

.page-about .about-ecosystem__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-ecosystem__item {
  display: grid;
  gap: 6px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-ecosystem__item:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.page-about .about-ecosystem__year {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--orange);
}

.page-about .about-ecosystem__text {
  font-size: 15px;
  line-height: 1.78;
  color: var(--paper);
}

.page-about .about-ecosystem__note {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.75;
  color: var(--steel);
}

/* ---------- 服务范围与联系 ---------- */

.page-about .about-reach {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-reach__item {
  display: grid;
  gap: 8px;
  padding: 20px 18px;
  background: var(--ink-deep);
}

.page-about .about-reach__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

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

.page-about .about-contact {
  margin-top: 32px;
  border-top: 1px solid var(--line);
}

.page-about .about-contact__row {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-contact__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--steel);
}

.page-about .about-contact__val {
  font-size: 16px;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.page-about .about-contact__note {
  margin: 18px 0 0;
  max-width: 64ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel);
}

/* ---------- 下一步阅读 ---------- */

.page-about .about-next {
  padding-block: 48px 56px;
  border-top: 1px solid var(--line);
}

.page-about .about-next__title {
  margin: 0 0 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--steel);
}

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

.page-about .about-next__link {
  display: grid;
  gap: 6px;
  padding: 18px 18px;
  background: var(--ink);
  text-decoration: none;
  transition: background-color 0.22s ease, transform 0.22s ease, box-shadow 0.22s ease;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: var(--ink-deep);
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow);
}

.page-about .about-next__label {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-next__desc {
  font-size: 14px;
  line-height: 1.65;
  color: var(--steel);
}

/* ---------- 响应式 ---------- */

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

  .page-about .about-contact__row {
    grid-template-columns: 140px minmax(0, 1fr);
    align-items: baseline;
    gap: 18px;
  }

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

@media (min-width: 900px) {
  .page-about .page-block {
    padding-block: 76px;
  }

  .page-about .page-about__open {
    padding-block: 52px 84px;
  }

  .page-about .about-open__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.8fr);
    gap: 56px;
    align-items: end;
  }

  .page-about .about-open__meta {
    margin-top: 40px;
  }

  .page-about .about-audience__row {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 30px;
    align-items: baseline;
    padding: 24px 0;
  }

  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 36px 52px;
  }

  .page-about .about-source__grid {
    grid-template-columns: minmax(0, 1fr) 360px;
    gap: 56px;
    align-items: start;
  }

  .page-about .about-source__figure {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .about-ecosystem {
    padding: 32px 34px;
  }

  .page-about .about-ecosystem__item {
    grid-template-columns: 90px minmax(0, 1fr);
    gap: 22px;
    align-items: baseline;
  }
}

@media (min-width: 960px) {
  .page-about .about-versions {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-years {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .about-years__list {
    flex-direction: column;
    gap: 14px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-years__link {
    width: 100%;
    text-align: center;
  }
}

@media (min-width: 1000px) {
  .page-about .about-flow {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 44px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-next__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .about-version:hover .about-version__more,
  .page-about .about-version:focus-within .about-version__more {
    max-height: 220px;
    opacity: 1;
    margin-top: 12px;
  }
}

@media (hover: none), (max-width: 899px) {
  .page-about .about-version__more {
    max-height: none;
    opacity: 1;
    margin-top: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-version__more,
  .page-about .about-team__fill,
  .page-about .about-next__link,
  .page-about .about-years__link {
    transition: none;
  }

  .page-about .about-next__link:hover,
  .page-about .about-next__link:focus-visible {
    transform: none;
  }
}