.page-about {
  --about-num-size: clamp(26px, 3.6vw, 36px);
  overflow-x: clip;
}

.page-about .crumbs {
  margin-bottom: clamp(14px, 2.4vw, 26px);
}

/* ============ 首屏框景 ============ */
.page-about .about-hero__frame {
  position: relative;
  border: var(--hair) solid var(--line);
  background: var(--card);
  padding: clamp(26px, 5vw, 60px) clamp(18px, 4vw, 54px) clamp(24px, 4vw, 46px);
  overflow: hidden;
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: min(220px, 42%);
  height: 3px;
  background: var(--vivid);
}

.page-about .about-hero__ticks {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 8px;
  background-image: repeating-linear-gradient(to right, var(--line) 0 1px, transparent 1px 22px);
  pointer-events: none;
}

.page-about .about-hero h1 {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(29px, 5vw, 56px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 0.22em 0 0.5em;
  max-width: 18em;
  overflow-wrap: break-word;
}

.page-about .about-hero .lede {
  max-width: 54ch;
  color: var(--graphite);
}

.page-about .about-hero__facts {
  margin-top: clamp(24px, 4vw, 44px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: var(--hair) solid var(--line);
  border-left: var(--hair) solid var(--line);
}

.page-about .about-fact {
  border-right: var(--hair) solid var(--line);
  border-bottom: var(--hair) solid var(--line);
  background: var(--paper);
  padding: 14px clamp(10px, 2vw, 20px);
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-fact__num {
  font-family: var(--mono);
  font-size: var(--about-num-size);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--moss);
}

.page-about .about-fact__label {
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--rock);
}

/* ============ 品牌定位 ============ */
.page-about .about-position__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 52px);
}

.page-about .about-position h2,
.page-about .about-journey h2,
.page-about .about-team h2,
.page-about .about-columns h2,
.page-about .about-partners h2,
.page-about .about-honor h2 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(25px, 3.6vw, 42px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 0.18em 0 0.6em;
  overflow-wrap: break-word;
}

.page-about .about-position .lede,
.page-about .about-team .lede,
.page-about .about-columns .lede,
.page-about .about-partners .lede {
  color: var(--graphite);
  max-width: 56ch;
}

.page-about .about-threads {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  border-top: var(--hair) solid var(--line);
}

.page-about .about-thread {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 14px;
  padding: 18px 0;
  border-bottom: var(--hair) solid var(--line);
}

.page-about .about-thread__no {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--gold);
  padding-top: 4px;
}

.page-about .about-thread__title {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 19px;
  line-height: 1.4;
  margin: 0;
  color: var(--ink);
}

.page-about .about-thread__desc {
  grid-column: 2;
  margin: 6px 0 0;
  font-size: 15.5px;
  line-height: 1.76;
  color: var(--rock);
}

.page-about .about-thread__desc a {
  color: var(--moss);
  text-decoration: none;
  border-bottom: var(--hair) solid var(--moss);
}

.page-about .about-position__figure {
  margin: 0;
  border: var(--hair) solid var(--line);
  background: var(--moss-bg);
  padding: clamp(10px, 1.6vw, 18px);
}

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

/* ============ 发展历程 ============ */
.page-about .about-journey__head {
  max-width: 62ch;
}

.page-about .about-journey__filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(22px, 3vw, 36px);
}

.page-about .about-stages {
  display: grid;
  gap: clamp(20px, 3vw, 38px);
}

.page-about .about-stage {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-stage[hidden] {
  display: none;
}

.page-about .about-stage__rail {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.page-about .about-stage__num {
  flex: none;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border: var(--hair) solid var(--moss);
  background: var(--paper);
  color: var(--moss);
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 0.02em;
}

.page-about .about-stage__line {
  flex: 1;
  width: 1px;
  margin-top: 8px;
  background: linear-gradient(to bottom, var(--line) 62%, transparent);
}

.page-about .about-stage__body {
  min-width: 0;
  padding-bottom: clamp(6px, 1.6vw, 16px);
}

.page-about .about-stage__when {
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.09em;
  color: var(--clay);
}

.page-about .about-stage__body h3 {
  font-family: var(--sans);
  font-weight: 600;
  font-size: clamp(18px, 2.4vw, 24px);
  line-height: 1.36;
  color: var(--ink);
  margin: 8px 0 10px;
}

.page-about .about-stage__body > p {
  margin: 0 0 12px;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--graphite);
  max-width: 62ch;
}

.page-about .about-stage__points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-stage__points li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--rock);
}

.page-about .about-stage__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 8px;
  height: 1px;
  background: var(--vivid);
}

.page-about .about-journey__figure {
  margin: clamp(26px, 4vw, 46px) 0 0;
  border: var(--hair) solid var(--line);
  background: var(--card);
  padding: clamp(10px, 1.4vw, 16px);
}

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

.page-about .about-journey__caption {
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--rock);
}

/* ============ 团队 ============ */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
}

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

.page-about .about-team__split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: var(--hair) solid var(--line);
  margin: clamp(18px, 3vw, 28px) 0;
}

.page-about .about-team__cell {
  background: var(--paper);
  padding: 18px clamp(12px, 2vw, 22px);
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .about-team__num {
  font-family: var(--mono);
  font-size: var(--about-num-size);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--vivid);
}

.page-about .about-team__label {
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--rock);
}

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

.page-about .about-flow li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 13px 0;
  border-top: var(--hair) solid var(--line);
}

.page-about .about-flow li:last-child {
  border-bottom: var(--hair) solid var(--line);
}

.page-about .about-flow__step {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--gold);
}

.page-about .about-flow li p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--graphite);
}

.page-about .about-team__figure {
  margin: 0;
  border: var(--hair) solid var(--line);
  background: var(--moss-bg);
  padding: clamp(10px, 1.4vw, 16px);
}

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

/* ============ 专栏地图 ============ */
.page-about .about-columns__head {
  margin-bottom: clamp(22px, 3vw, 34px);
  max-width: 62ch;
}

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

.page-about .about-column {
  background: var(--paper);
  padding: clamp(20px, 2.6vw, 30px);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: background var(--speed) ease;
}

.page-about .about-column:hover,
.page-about .about-column:focus-within {
  background: var(--card);
}

.page-about .about-column__no {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.07em;
  color: var(--gold);
}

.page-about .about-column__title {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 20px;
  line-height: 1.4;
  margin: 0;
  color: var(--ink);
}

.page-about .about-column__desc {
  margin: 0;
  flex: 1;
  font-size: 15px;
  line-height: 1.74;
  color: var(--rock);
}

.page-about .about-column__link {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.07em;
  color: var(--moss);
  text-decoration: none;
  border-bottom: var(--hair) solid var(--moss);
}

.page-about .about-column__link:focus-visible {
  outline: 2px solid var(--moss);
  outline-offset: 3px;
}

/* ============ 合作生态 ============ */
.page-about .about-partners__head {
  max-width: 62ch;
}

.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: var(--hair) solid var(--line);
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-partner {
  background: var(--card);
  padding: clamp(20px, 2.6vw, 30px);
}

.page-about .about-partner__no {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.07em;
  color: var(--moss);
}

.page-about .about-partner h3 {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 19px;
  line-height: 1.4;
  margin: 10px 0 8px;
  color: var(--ink);
}

.page-about .about-partner p {
  margin: 0;
  font-size: 15px;
  line-height: 1.74;
  color: var(--rock);
}

.page-about .about-partners__cta {
  margin-top: clamp(22px, 3vw, 32px);
}

/* ============ 荣誉 ============ */
.page-about .about-honor__box {
  border: var(--hair) solid var(--gold);
  background:
    linear-gradient(158deg, rgba(201, 162, 74, 0.1), transparent 60%),
    var(--paper);
  padding: clamp(22px, 4vw, 46px);
}

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

.page-about .about-honor__box h2 {
  margin-top: 0.16em;
}

.page-about .about-honor__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--graphite);
}

.page-about .about-honor__stats {
  margin: clamp(20px, 3vw, 30px) 0 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: var(--hair) solid var(--line);
}

.page-about .about-honor__stat {
  background: var(--paper);
  padding: 16px clamp(12px, 2vw, 20px);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-honor__stat-num {
  font-family: var(--mono);
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-about .about-honor__stat-label {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--rock);
}

/* ============ 媒体查询 ============ */
@media (min-width: 640px) {
  .page-about .about-columns__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 860px) {
  .page-about .about-partners__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-position__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-columns__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-stage:nth-child(even) {
    margin-left: clamp(28px, 7vw, 92px);
  }

  .page-about .about-stages {
    gap: clamp(24px, 3.4vw, 44px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-column,
  .page-about .about-column__link {
    transition: none;
  }
}