.page-about {
  --about-gap: clamp(1.4rem, 3.4vw, 3.2rem);
  --about-pad: clamp(1.6rem, 4vw, 3.2rem);
  --about-rule: rgba(167, 184, 196, .22);
  --about-rule-ink: rgba(16, 24, 32, .16);
  --about-rule-warm: rgba(184, 137, 74, .45);
  --about-ink-soft: rgba(16, 24, 32, .78);
}

.page-about .about-head,
.page-about .about-origin,
.page-about .about-scale,
.page-about .about-history,
.page-about .about-team,
.page-about .about-eco,
.page-about .about-contact {
  scroll-margin-top: 5rem;
}

.page-about .about-head {
  padding-bottom: var(--about-pad);
}

.page-about .about-head .breadcrumb-link {
  color: var(--haze);
}

.page-about .about-head .breadcrumb-current {
  color: var(--white);
}

.page-about .about-head .eyebrow {
  margin-top: clamp(1.2rem, 3vw, 2rem);
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .16em;
  color: var(--copper-light);
}

.page-about .about-head .page-title {
  max-width: 20ch;
  color: var(--white);
  line-height: 1.16;
}

.page-about .about-head .lede {
  max-width: 52ch;
  color: var(--haze);
  font-size: clamp(1rem, 1.6vw, 1.14rem);
  line-height: 1.85;
}

/* 首屏数据条 */
.page-about .about-head-facts {
  list-style: none;
  margin: clamp(1.4rem, 3vw, 2.2rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--about-rule-warm);
  border-left: 1px solid var(--about-rule);
}

.page-about .about-head-facts li {
  padding: .95rem 1rem;
  border-right: 1px solid var(--about-rule);
  border-bottom: 1px solid var(--about-rule);
  min-width: 0;
}

.page-about .about-fact-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: .02em;
  color: var(--copper-light);
}

.page-about .about-fact-unit {
  font-family: var(--font-body);
  font-size: .82rem;
  font-weight: 600;
  margin-left: .12em;
  color: var(--haze);
}

.page-about .about-fact-label {
  display: block;
  margin-top: .45rem;
  font-size: .8rem;
  letter-spacing: .05em;
  line-height: 1.5;
  color: var(--haze);
}

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

/* 深浅分区文字基调 */
.page-about .section--paper .section-title {
  color: var(--ink);
}

.page-about .section--paper .section-index {
  color: var(--cinnabar);
}

.page-about .section--paper .section-lead {
  color: var(--about-ink-soft);
}

.page-about .section--ink .section-title,
.page-about .section--deep .section-title {
  color: var(--white);
}

.page-about .section--ink .section-index,
.page-about .section--deep .section-index {
  color: var(--copper-light);
}

.page-about .section--ink .section-lead,
.page-about .section--deep .section-lead {
  color: var(--haze);
}

/* 通用两栏：正文 + 旁注 */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

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

.page-about .about-aside {
  display: grid;
  gap: 1.4rem;
  min-width: 0;
  align-content: start;
}

@media (min-width: 920px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-note {
    position: sticky;
    top: 5.5rem;
  }
}

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

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

.page-about .about-figure .media-caption {
  font-size: .78rem;
  line-height: 1.6;
  margin-top: .6rem;
}

.page-about .about-team .media-caption {
  color: var(--haze);
}

.page-about .about-note {
  border-left: 2px solid var(--copper);
  background: rgba(184, 137, 74, .09);
  padding: .9rem 1rem;
}

.page-about .about-note-label {
  margin: 0 0 .5rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--cinnabar);
}

.page-about .about-note p:last-child {
  margin: 0;
  font-size: .88rem;
  line-height: 1.75;
  color: rgba(16, 24, 32, .8);
}

/* 路径理念三条 */
.page-about .about-principles {
  list-style: none;
  margin: clamp(1.6rem, 3vw, 2.2rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1.1rem;
}

.page-about .about-principles li {
  border-top: 2px solid var(--copper);
  padding-top: .9rem;
}

.page-about .about-principle-title {
  margin: 0 0 .45rem;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-principles p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--about-ink-soft);
}

@media (min-width: 760px) {
  .page-about .about-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.4rem;
  }
}

/* 规模数字 */
.page-about .about-stats {
  list-style: none;
  margin: clamp(1.6rem, 3vw, 2.4rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--about-rule-warm);
  border-left: 1px solid var(--about-rule);
}

.page-about .about-stat {
  padding: 1.15rem 1.05rem 1.3rem;
  border-right: 1px solid var(--about-rule);
  border-bottom: 1px solid var(--about-rule);
  min-width: 0;
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.8rem, 4.6vw, 3rem);
  line-height: 1;
  letter-spacing: .01em;
  color: var(--copper-light);
}

.page-about .about-stat-unit {
  font-family: var(--font-body);
  font-size: .95rem;
  margin-left: .1em;
  color: var(--haze);
}

.page-about .about-stat-label {
  margin: .7rem 0 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--white);
}

.page-about .about-stat-note {
  margin: .4rem 0 0;
  font-size: .82rem;
  line-height: 1.65;
  color: var(--haze);
}

@media (min-width: 900px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-scale-notes {
  display: grid;
  gap: 1.3rem;
  margin-top: clamp(1.6rem, 3vw, 2.2rem);
}

.page-about .about-scale-notes h3 {
  margin: 0 0 .5rem;
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--copper-light);
}

.page-about .about-scale-notes p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.8;
  color: var(--haze);
}

@media (min-width: 760px) {
  .page-about .about-scale-notes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 2.2rem;
  }
}

/* 时间轴 */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(1.8rem, 3.4vw, 2.6rem) 0 0;
  padding: 0;
}

.page-about .about-tl-item {
  position: relative;
  margin-left: .55rem;
  padding: 0 0 1.9rem 2rem;
  border-left: 1px solid var(--about-rule-warm);
}

.page-about .about-tl-item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: .3rem;
  width: 13px;
  height: 13px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--copper);
  border: 2px solid var(--paper);
}

.page-about .about-tl-item:last-child::before {
  background: var(--cinnabar);
}

.page-about .about-tl-item:hover::before,
.page-about .about-tl-item:focus-visible::before {
  background: var(--cinnabar);
  box-shadow: 0 0 0 3px rgba(178, 58, 46, .18);
}

.page-about .about-tl-item:focus-visible {
  outline: 2px solid var(--celadon);
  outline-offset: 4px;
}

.page-about .about-tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--graphite);
}

.page-about .about-tl-item:hover .about-tl-year,
.page-about .about-tl-item:focus-visible .about-tl-year {
  color: var(--cinnabar);
}

.page-about .about-tl-title {
  margin: .35rem 0 .45rem;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.4vw, 1.45rem);
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-tl-text {
  margin: 0;
  max-width: 64ch;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

/* 团队 */
.page-about .about-team-top {
  display: grid;
  gap: var(--about-gap);
}

@media (min-width: 900px) {
  .page-about .about-team-top {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: center;
  }
}

.page-about .about-team-list {
  list-style: none;
  margin: clamp(1.8rem, 3.4vw, 2.6rem) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-team-item {
  position: relative;
  padding: 1.1rem 0 1.2rem 2.4rem;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-team-num {
  position: absolute;
  left: 0;
  top: 1.3rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .1em;
  color: var(--copper);
}

.page-about .about-team-item h3 {
  margin: 0 0 .4rem;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-team-item p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--haze);
}

@media (min-width: 760px) {
  .page-about .about-team-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 2.6rem;
  }
}

.page-about .about-team-footnote {
  margin: 1.4rem 0 0;
  padding-left: .8rem;
  border-left: 2px solid var(--celadon);
  font-size: .85rem;
  line-height: 1.7;
  color: var(--celadon);
}

/* 合作网络 */
.page-about .about-network {
  list-style: none;
  margin: clamp(1.4rem, 3vw, 2rem) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-rule-ink);
}

.page-about .about-network li {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr);
  column-gap: .9rem;
  padding: .95rem 0 1rem;
  border-bottom: 1px solid var(--about-rule-ink);
}

.page-about .about-dot {
  width: 10px;
  height: 10px;
  margin-top: .42rem;
  border-radius: 50%;
  background: var(--copper);
}

.page-about .about-dot--celadon {
  background: var(--celadon);
}

.page-about .about-network h3 {
  margin: 0 0 .3rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-network p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--about-ink-soft);
}

.page-about .about-checks {
  margin-top: clamp(1.6rem, 3vw, 2.2rem);
  padding-top: 1.2rem;
  border-top: 2px solid var(--cinnabar);
}

.page-about .about-checks-title {
  margin: 0 0 .85rem;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-checks ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .7rem;
}

.page-about .about-checks li {
  position: relative;
  padding-left: 1.4rem;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--about-ink-soft);
}

.page-about .about-checks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 8px;
  height: 8px;
  background: var(--celadon);
}

/* 联系收束 */
.page-about .about-contact-inner {
  display: grid;
  gap: var(--about-gap);
}

@media (min-width: 900px) {
  .page-about .about-contact-inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .about-contact-copy p {
  color: var(--haze);
  font-size: .95rem;
  line-height: 1.85;
  max-width: 46ch;
}

.page-about .about-contact-panel {
  border: 1px solid var(--about-rule);
  background: rgba(11, 29, 48, .55);
  padding: clamp(1.1rem, 2.5vw, 1.7rem);
}

.page-about .about-contact-list {
  margin: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-contact-item {
  display: grid;
  gap: .25rem;
  padding-bottom: .9rem;
  border-bottom: 1px solid var(--about-rule);
}

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

.page-about .about-contact-label {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .14em;
  color: var(--copper-light);
}

.page-about .about-contact-value {
  margin: 0;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--white);
  word-break: break-word;
}

.page-about .about-contact-value .copy-btn {
  margin-left: .6rem;
  vertical-align: middle;
}

.page-about .copy-status {
  margin: .8rem 0 0;
  min-height: 1.2em;
  font-size: .8rem;
  color: var(--celadon);
}

.page-about .about-contact-note {
  margin: 1rem 0 0;
  font-size: .82rem;
  line-height: 1.7;
  color: var(--haze);
}

@media print {
  .page-about .about-note {
    position: static;
    background: none;
  }

  .page-about .about-tl-item {
    break-inside: avoid;
  }

  .page-about .about-figure {
    break-inside: avoid;
  }
}