.page-about {
  --about-gap: clamp(48px, 8vw, 112px);
  --about-ink-soft: #3A4441;
  --about-shade: rgba(23, 92, 69, .08);
}

/* ========== 首屏 ========== */
.page-about .about-hero {
  padding-top: clamp(22px, 3.6vw, 40px);
  padding-bottom: clamp(40px, 6vw, 76px);
  background: linear-gradient(180deg, rgba(14, 59, 46, .055), rgba(244, 241, 232, 0) 64%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 34px;
  margin-top: clamp(22px, 3.4vw, 38px);
}

.page-about .about-hero h1 {
  font-size: clamp(36px, 7.2vw, 88px);
  font-weight: 250;
  line-height: 1.06;
  letter-spacing: -.012em;
  margin: 14px 0 0;
  max-width: 15ch;
}

.page-about .about-hero__intro {
  max-width: 54ch;
  margin-top: 22px;
  font-size: clamp(16px, 1.15vw, 18px);
  line-height: 1.85;
  color: var(--about-ink-soft);
}

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

.page-about .about-hero__stats {
  position: relative;
  border-top: 1px solid var(--line);
  padding-top: 8px;
}

.page-about .about-hero__stats::before {
  content: "";
  position: absolute;
  top: -4px;
  right: 0;
  width: 62px;
  height: 7px;
  background: var(--orange);
  transform: skewX(-24deg);
}

.page-about .about-stat {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0 13px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-stat .metric {
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1;
  color: var(--green-deep);
}

.page-about .about-stat__unit {
  font-size: .5em;
  margin-left: 2px;
  color: var(--steel);
}

.page-about .about-stat .metric-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--steel);
  text-align: right;
  white-space: nowrap;
}

.page-about .about-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(30px, 4.2vw, 48px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index li {
  margin: 0;
}

.page-about .about-index a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--steel);
  text-decoration: none;
  background: transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--ink);
  border-color: var(--green-tactic);
  background: var(--white);
}

.page-about .about-index .mono {
  color: var(--orange);
}

/* ========== 通用标题节奏 ========== */
.page-about h2 {
  font-size: clamp(25px, 3.6vw, 44px);
  font-weight: 300;
  line-height: 1.18;
  letter-spacing: -.008em;
  margin: 0;
  max-width: 22ch;
}

.page-about .section-head {
  margin-bottom: clamp(24px, 3.6vw, 40px);
}

/* ========== 品牌故事 ========== */
.page-about .about-story__grid {
  display: grid;
  gap: clamp(26px, 4vw, 40px);
  align-items: center;
}

.page-about .about-story__text h2 {
  margin-top: 10px;
}

.page-about .about-story__text .prose {
  margin-top: 20px;
}

.page-about .about-story__text .prose p {
  font-size: 16px;
  line-height: 1.9;
  color: var(--about-ink-soft);
}

.page-about .about-story__note {
  margin-top: 26px;
  padding: 18px 20px;
  border-left: 3px solid var(--orange);
  background: var(--white);
  box-shadow: 0 1px 0 rgba(20, 24, 26, .05);
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .about-story__media {
  border: 1px solid var(--line);
  background: var(--green-deep);
  padding: 0;
  margin: 0;
}

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

.page-about .media-caption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--steel);
  padding: 10px 2px 0;
}

/* ========== 档案结构 ========== */
.page-about .about-archive__cells {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-about .about-archive__cell {
  background: var(--paper);
  padding: 22px 18px 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-archive__cell .metric {
  font-size: clamp(34px, 5.2vw, 56px);
  line-height: 1;
  color: var(--green-deep);
}

.page-about .about-archive__cell .metric--orange {
  color: var(--orange);
}

.page-about .about-archive__cell .metric-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--steel);
}

.page-about .about-archive__detail {
  gap: clamp(22px, 3.4vw, 40px);
}

.page-about .about-note {
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.page-about .about-note .mono {
  display: block;
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--orange);
  margin-bottom: 10px;
}

.page-about .about-note h3 {
  font-size: clamp(17px, 1.6vw, 20px);
  font-weight: 500;
  line-height: 1.5;
  margin: 0 0 10px;
  color: var(--ink);
}

.page-about .about-note p {
  font-size: 15px;
  line-height: 1.9;
  color: var(--about-ink-soft);
  margin: 0;
}

/* ========== 标签体系 ========== */
.page-about .about-tags__intro {
  font-size: 16px;
  line-height: 1.9;
  color: var(--about-ink-soft);
  margin: 0 0 clamp(26px, 4vw, 40px);
}

.page-about .about-tags__body {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  align-items: start;
}

.page-about .about-tags__media {
  border: 1px solid var(--line);
  background: var(--green-deep);
  padding: 0;
  margin: 0;
}

.page-about .about-tabs__row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 20px;
}

.page-about .about-tabs__row button.tag {
  appearance: none;
  border: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
  padding: 7px 13px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--steel);
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-tabs__row button.tag:hover,
.page-about .about-tabs__row button.tag:focus-visible {
  color: var(--ink);
  border-color: var(--green-tactic);
}

.page-about .about-tabs__row button.tag.is-active {
  color: var(--green-deep);
  border-color: var(--green-tactic);
  background: var(--about-shade);
}

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

.page-about .about-panel__lead {
  font-size: 16px;
  line-height: 1.9;
  color: var(--about-ink-soft);
  margin: 0 0 18px;
  max-width: 56ch;
}

.page-about .about-chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-chip-list li {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--steel);
  background: var(--white);
  border: 1px solid var(--line);
  padding: 6px 11px;
}

/* ========== 版本演进 ========== */
.page-about .about-versions__band {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 14px 24px;
  background: var(--green-deep);
  padding: clamp(22px, 3.6vw, 36px) clamp(20px, 3.2vw, 40px);
  margin-bottom: clamp(28px, 4.4vw, 46px);
}

.page-about .about-versions__band .metric {
  color: var(--cyan);
  font-size: clamp(52px, 9vw, 104px);
  line-height: .88;
}

.page-about .about-versions__band p {
  margin: 0;
  max-width: 38ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 241, 232, .82);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
  border-left: 1px solid var(--line);
}

.page-about .about-timeline > li {
  position: relative;
  padding-bottom: 28px;
}

.page-about .about-timeline > li:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline > li::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--paper);
  border: 1px solid var(--green-tactic);
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-timeline > li:hover::before,
.page-about .about-timeline > li:focus-within::before {
  background: var(--orange);
  border-color: var(--orange);
}

.page-about .about-timeline__ver {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--steel);
  margin: 0;
}

.page-about .about-timeline h3 {
  font-size: clamp(18px, 1.9vw, 22px);
  font-weight: 400;
  line-height: 1.45;
  margin: 7px 0 8px;
  color: var(--ink);
}

.page-about .about-timeline > li > p {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--about-ink-soft);
}

.page-about .about-timeline__more {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  margin-top: 0;
  transition: max-height 240ms var(--ease), opacity 240ms var(--ease), margin-top 240ms var(--ease);
}

.page-about .about-timeline__more .mono {
  display: block;
  font-size: 11px;
  line-height: 1.8;
  letter-spacing: .06em;
  color: var(--green-tactic);
  border-left: 2px solid var(--line);
  padding-left: 12px;
  margin: 0;
}

.page-about .about-timeline > li:hover .about-timeline__more,
.page-about .about-timeline > li:focus-within .about-timeline__more {
  max-height: 180px;
  opacity: 1;
  margin-top: 12px;
}

/* ========== 合作与服务 ========== */
.page-about .about-eco__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  align-items: center;
}

.page-about .about-eco__text h2 {
  margin-top: 10px;
}

.page-about .about-eco__text .prose {
  margin-top: 20px;
}

.page-about .about-eco__text .prose p {
  font-size: 16px;
  line-height: 1.9;
  color: var(--about-ink-soft);
}

.page-about .about-eco__list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-eco__list li {
  border-top: 1px solid var(--line);
  padding-top: 12px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .about-eco__list .mono {
  display: block;
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--green-tactic);
  margin-bottom: 5px;
}

.page-about .about-eco__media {
  border: 1px solid var(--line);
  background: var(--green-deep);
  padding: 0;
  margin: 0;
}

.page-about .about-cta {
  margin-top: clamp(34px, 5vw, 58px);
  background: var(--green-deep);
  padding: clamp(24px, 4vw, 44px);
  display: grid;
  gap: 24px;
}

.page-about .about-cta__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .about-cta h3 {
  font-size: clamp(20px, 2.4vw, 27px);
  font-weight: 300;
  line-height: 1.35;
  margin: 10px 0 10px;
  color: var(--paper);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 241, 232, .82);
}

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

.page-about .about-cta .btn--accent {
  border: 1px solid var(--orange);
  color: var(--orange);
  background: transparent;
}

.page-about .about-cta .btn--accent:hover,
.page-about .about-cta .btn--accent:focus-visible {
  background: var(--orange);
  color: var(--green-deep);
}

.page-about .about-cta .btn--ghost {
  border: 1px solid rgba(244, 241, 232, .32);
  color: var(--paper);
  background: transparent;
}

.page-about .about-cta .btn--ghost:hover,
.page-about .about-cta .btn--ghost:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

/* ========== 响应式 ========== */
@media (min-width: 620px) {
  .page-about .about-hero__actions .btn {
    min-width: 176px;
    text-align: center;
  }

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

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(220px, .58fr);
    gap: clamp(32px, 6vw, 92px);
    align-items: end;
  }

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

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .about-cta__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .page-about .about-cta__actions .btn {
    text-align: center;
  }
}

@media (min-width: 960px) {
  .page-about .about-story__grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, .96fr);
    gap: clamp(34px, 5vw, 76px);
  }

  .page-about .about-tags__body {
    grid-template-columns: minmax(0, .86fr) minmax(0, 1.14fr);
  }

  .page-about .about-eco__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .92fr);
  }
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__more,
  .page-about .about-index a,
  .page-about .about-tabs__row button.tag,
  .page-about .about-timeline > li::before {
    transition: none;
  }
}