.page-about {
  --about-rule: rgba(61, 242, 192, 0.24);
  --about-rule-soft: rgba(242, 247, 245, 0.13);
  --about-gap: clamp(18px, 3vw, 40px);
  display: block;
  color: var(--paper);
  font-family: var(--font-sans);
}

.page-about .about-kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-head {
  margin-bottom: clamp(24px, 3.6vw, 46px);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-block: clamp(22px, 4vw, 44px) clamp(40px, 6vw, 84px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  margin-top: clamp(18px, 3vw, 34px);
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-size: clamp(29px, 5.4vw, 54px);
  line-height: 1.12;
  font-weight: 900;
  letter-spacing: -0.01em;
  transform: skewX(-2deg);
  transform-origin: left top;
}

.page-about .about-hero__lead {
  margin: 0 0 26px;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: rgba(242, 247, 245, 0.88);
}

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

.page-about .about-hero__panel {
  position: relative;
  padding: 20px 20px 22px;
  border: 1px solid var(--about-rule);
  background: linear-gradient(158deg, rgba(14, 59, 58, 0.92), rgba(5, 28, 23, 0.96));
  box-shadow: var(--shadow-card);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .about-hero__panel-title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .about-stats {
  margin: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-stats__row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding-bottom: 9px;
  border-bottom: 1px dashed var(--about-rule-soft);
}

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

.page-about .about-stats dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--moss);
}

.page-about .about-stats dd {
  margin: 0;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--cyan);
}

.page-about .about-hero__figure {
  margin: clamp(26px, 4vw, 50px) 0 0;
}

.page-about .about-hero__figure img,
.page-about .about-pipeline__figure img,
.page-about .about-eco__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 沿革 ---------- */

.page-about .about-history,
.page-about .about-team,
.page-about .about-pipeline,
.page-about .about-coverage,
.page-about .about-eco,
.page-about .about-why {
  padding-block: clamp(42px, 7vw, 94px);
}

.page-about .about-history__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 34px);
}

.page-about .about-history__index-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--moss);
}

.page-about .about-history__years {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--moss);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2.2vw, 22px);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 18px 20px 20px 22px;
  border: 1px solid var(--about-rule-soft);
  border-left: 3px solid var(--cyan);
  background: rgba(11, 47, 38, 0.72);
  box-shadow: var(--shadow-card);
  transition: transform 0.28s var(--ease), border-color 0.28s var(--ease);
}

.page-about .about-timeline__item:nth-child(3) {
  border-left-color: var(--amber);
}

.page-about .about-timeline__item:nth-child(4) {
  border-left-color: var(--violet);
}

.page-about .about-timeline__item:nth-child(5) {
  border-left-color: var(--wine);
}

.page-about .about-timeline__item:nth-child(6) {
  border-left-color: var(--cyan);
}

.page-about .about-timeline__item:hover {
  transform: translateY(-3px);
  border-color: var(--about-rule);
}

.page-about .about-timeline__date {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-size: clamp(17px, 1.9vw, 20px);
  font-weight: 800;
  line-height: 1.4;
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(242, 247, 245, 0.78);
}

.page-about .about-versions {
  margin: clamp(26px, 4vw, 46px) 0 0;
  padding: clamp(16px, 2.4vw, 28px);
  border: 1px dashed var(--about-rule);
  background: rgba(33, 26, 68, 0.34);
}

.page-about .about-versions__svg {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

.page-about .about-versions__caption {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--moss);
}

.page-about .ver-grid line {
  stroke: rgba(159, 184, 175, 0.2);
  stroke-width: 1;
}

.page-about .ver-line {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 3;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.page-about .ver-dot {
  fill: var(--amber);
}

.page-about .ver-label {
  fill: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
}

.page-about .ver-sub {
  fill: var(--moss);
  font-family: var(--font-mono);
  font-size: 10px;
}

/* ---------- 团队 ---------- */

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

.page-about .team-block {
  --team-color: var(--cyan);
  position: relative;
  padding: 24px 18px 24px;
  border: 1px solid var(--about-rule-soft);
  background: rgba(11, 47, 38, 0.78);
  box-shadow: var(--shadow-card);
  transition: transform 0.28s var(--ease), border-color 0.28s var(--ease);
}

.page-about .team-block::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: var(--team-color);
}

.page-about .team-block:hover {
  transform: translateY(-4px);
  border-color: var(--about-rule);
}

.page-about .team-block--proof {
  --team-color: var(--amber);
}

.page-about .team-block--visual {
  --team-color: var(--violet);
}

.page-about .team-block--content {
  --team-color: var(--wine);
}

.page-about .team-block__idx {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  color: var(--team-color);
  opacity: 0.75;
}

.page-about .team-block__name {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.page-about .team-block__text {
  margin: 0 0 16px;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(242, 247, 245, 0.78);
}

.page-about .team-block__keys {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--team-color);
  opacity: 0.55;
  transition: opacity 0.28s var(--ease);
}

.page-about .team-block:hover .team-block__keys {
  opacity: 1;
}

/* ---------- 链路 ---------- */

.page-about .about-pipeline__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .pipe-step {
  padding: 20px 18px 22px;
  border: 1px solid var(--about-rule-soft);
  border-top: 2px solid rgba(61, 242, 192, 0.45);
  background: rgba(14, 59, 58, 0.58);
}

.page-about .pipe-step__idx {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  color: rgba(61, 242, 192, 0.42);
}

.page-about .pipe-step__name {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
}

.page-about .pipe-step__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: rgba(242, 247, 245, 0.78);
}

.page-about .about-pipeline__figure {
  margin: clamp(26px, 3.6vw, 46px) 0 0;
}

/* ---------- 覆盖范围 ---------- */

.page-about .about-coverage__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: clamp(24px, 3.6vw, 42px);
}

.page-about .cov-stat {
  padding: 18px 16px 16px;
  border: 1px solid var(--about-rule-soft);
  background: rgba(14, 59, 58, 0.55);
}

.page-about .cov-stat__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(34px, 5vw, 52px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .cov-stat__label {
  margin: 10px 0 0;
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--moss);
}

.page-about .about-coverage__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0 clamp(20px, 3vw, 44px);
}

.page-about .coverage-row {
  padding: 18px 0;
  border-bottom: 1px dashed var(--about-rule-soft);
}

.page-about .coverage-row__name {
  margin: 0 0 7px;
  font-size: 16.5px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .coverage-row__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(242, 247, 245, 0.76);
}

/* ---------- 合作生态 ---------- */

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

.page-about .about-eco__figure {
  margin: 0;
}

.page-about .about-eco__cards {
  display: grid;
  gap: 14px;
}

.page-about .eco-card {
  --eco-color: var(--violet);
  padding: 20px 20px 22px;
  border: 1px solid var(--about-rule-soft);
  border-left: 3px solid var(--eco-color);
  background: rgba(33, 26, 68, 0.42);
  transition: transform 0.28s var(--ease), background 0.28s var(--ease);
}

.page-about .eco-card--campus {
  --eco-color: var(--amber);
}

.page-about .eco-card--study {
  --eco-color: var(--wine);
}

.page-about .eco-card:hover {
  transform: translateY(-4px);
  background: rgba(33, 26, 68, 0.62);
}

.page-about .eco-card__name {
  margin: 0 0 9px;
  font-size: 17px;
  font-weight: 800;
}

.page-about .eco-card__text {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(242, 247, 245, 0.78);
}

.page-about .eco-card__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--eco-color);
}

/* ---------- 选择理由 ---------- */

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

.page-about .why-cell {
  padding: 22px 20px 24px;
  border: 1px solid var(--about-rule-soft);
  background: linear-gradient(180deg, rgba(11, 47, 38, 0.82), rgba(5, 28, 23, 0.72));
  transition: transform 0.28s var(--ease), border-color 0.28s var(--ease);
}

.page-about .why-cell:hover {
  transform: translateY(-4px);
  border-color: var(--about-rule);
}

.page-about .why-cell__tag {
  display: inline-block;
  margin: 0 0 14px;
  padding: 4px 10px;
  border: 1px solid var(--about-rule);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .why-cell__name {
  margin: 0 0 9px;
  font-size: 17.5px;
  font-weight: 800;
}

.page-about .why-cell__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(242, 247, 245, 0.78);
}

.page-about .about-cta {
  margin-top: clamp(28px, 4vw, 50px);
  padding: clamp(22px, 3vw, 34px);
  border: 1px solid var(--about-rule);
  background: linear-gradient(120deg, rgba(33, 26, 68, 0.78), rgba(11, 47, 38, 0.82));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .about-cta__text {
  margin: 0 0 20px;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(242, 247, 245, 0.88);
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 760px) {
  .page-about .about-team__blocks {
    grid-template-columns: 1.35fr 1.05fr 0.85fr 1.15fr;
    align-items: start;
  }

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

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

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

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

@media (min-width: 880px) {
  .page-about .about-history__layout {
    grid-template-columns: 116px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-history__index {
    position: sticky;
    top: calc(var(--topbar-h) + 34px);
    padding-left: 14px;
    border-left: 1px solid var(--about-rule);
  }

  .page-about .about-history__years {
    flex-direction: column;
    gap: 15px;
  }

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

@media (min-width: 940px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.58fr) minmax(0, 1fr);
    align-items: stretch;
  }

  .page-about .about-eco__layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.12fr);
    gap: clamp(28px, 4vw, 56px);
  }

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