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

/* ══════════ 面包屑 ══════════ */
.page-about .about-crumb {
  padding-top: clamp(14px, 2.4vw, 26px);
}

/* ══════════ 首屏 ══════════ */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 3.6vw, 46px) 0 clamp(26px, 4.2vw, 56px);
}

.page-about .about-hero .vertical-note {
  position: absolute;
  top: clamp(18px, 3.4vw, 52px);
  right: clamp(6px, 1.6vw, 20px);
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.34em;
  color: var(--stone);
  opacity: 0.8;
  margin: 0;
  pointer-events: none;
}

@media (max-width: 1180px) {
  .page-about .about-hero .vertical-note {
    display: none;
  }
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 5.6vw, 68px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--text);
  margin: clamp(10px, 1.6vw, 18px) 0 clamp(16px, 2.2vw, 24px);
}

.page-about .about-lead {
  font-family: var(--font-body);
  font-size: clamp(16px, 1.4vw, 18px);
  line-height: 1.9;
  color: var(--stone);
  margin: 0 0 clamp(20px, 2.8vw, 32px);
  max-width: 60ch;
}

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

.page-about .about-hero-side {
  margin-top: 26px;
}

@media (min-width: 1024px) {
  .page-about .about-hero-side {
    margin-top: 0;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
  }
}

.page-about .about-figures {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-figures .metric {
  background: var(--white);
  padding: clamp(14px, 1.8vw, 22px) clamp(12px, 1.6vw, 18px);
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.page-about .about-figures .metric__value {
  font-family: var(--font-mono);
  font-size: clamp(21px, 2.3vw, 29px);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-figures .metric__label {
  font-family: var(--font-sans);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--stone);
}

/* ══════════ 宽幅图带 ══════════ */
.page-about .about-band {
  margin-bottom: clamp(32px, 5vw, 72px);
}

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

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

/* ══════════ 通用区块 ══════════ */
.page-about .about-section {
  padding: clamp(30px, 4.4vw, 64px) 0;
}

.page-about .section-head {
  max-width: 64ch;
  margin-bottom: clamp(22px, 3vw, 38px);
}

.page-about .about-section-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.1vw, 37px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--text);
  margin: 10px 0 12px;
}

.page-about .about-section-title--light {
  color: var(--paper);
}

.page-about .about-sub {
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--stone);
  margin: 0;
}

.page-about .about-sub--light {
  color: rgba(247, 243, 234, 0.76);
}

.page-about .about-aside-note {
  font-family: var(--font-sans);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--stone);
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--line);
}

.page-about .about-copy p {
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--text);
  margin: 0 0 16px;
}

.page-about .about-copy p:last-child {
  margin-bottom: 0;
}

/* ══════════ 版本演进时间线 ══════════ */
.page-about .about-timeline {
  padding: clamp(34px, 5vw, 76px) 0;
  background: var(--paper);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .tl {
  --tl-col: 68px;
  position: relative;
}

@media (min-width: 768px) {
  .page-about .tl {
    --tl-col: 106px;
  }
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: calc(var(--tl-col) / 2);
  top: 14px;
  bottom: 14px;
  width: 2px;
  transform: translateX(-1px);
  background: linear-gradient(180deg,
    var(--gold-light) 0%,
    var(--gold) 20%,
    rgba(200, 145, 43, 0.36) 76%,
    rgba(200, 145, 43, 0.08) 100%);
}

.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: var(--tl-col) minmax(0, 1fr);
  gap: 0 16px;
  padding-bottom: clamp(16px, 2.2vw, 28px);
}

@media (min-width: 768px) {
  .page-about .tl-item {
    gap: 0 26px;
  }
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: calc(var(--tl-col) / 2);
  top: 24px;
  width: 13px;
  height: 13px;
  transform: translateX(-50%);
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px var(--paper), 0 0 0 5px rgba(200, 145, 43, 0.42);
  z-index: 2;
}

.page-about .tl-node {
  text-align: right;
  padding-right: 14px;
  padding-top: 18px;
}

.page-about .tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(13px, 1.5vw, 17px);
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--gold);
  line-height: 1.2;
}

.page-about .tl-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  padding: clamp(17px, 2.2vw, 26px);
  margin: 0;
}

.page-about .tl-card--now {
  border-left-color: var(--cinnabar);
}

@media (min-width: 900px) {
  .page-about .tl-item:nth-child(even) .tl-card {
    margin-left: clamp(20px, 4vw, 62px);
  }
}

.page-about .tl-card .card__meta {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--stone);
  margin: 0 0 11px;
}

.page-about .tl-tag {
  display: inline-block;
  padding: 2px 9px;
  background: var(--bronze);
  color: var(--white);
  font-family: var(--font-sans);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  line-height: 1.7;
}

.page-about .tl-card--now .tl-tag {
  background: var(--cinnabar);
}

.page-about .tl-card .card__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.4;
  color: var(--text);
  margin: 0 0 10px;
}

.page-about .tl-card .card__body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.88;
  color: var(--text);
  margin: 0 0 12px;
}

.page-about .tl-card .disclosure {
  margin-top: 4px;
}

.page-about .tl-card .disclosure__body {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
  padding-top: 10px;
}

.page-about .tl-card .disclosure__body ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl-card .disclosure__body li {
  position: relative;
  padding-left: 17px;
  margin-bottom: 6px;
}

.page-about .tl-card .disclosure__body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.8em;
  width: 8px;
  height: 2px;
  background: var(--gold);
}

.page-about .tl-figure {
  margin: 4px 0 clamp(20px, 2.8vw, 34px) calc(var(--tl-col) + 16px);
}

@media (min-width: 768px) {
  .page-about .tl-figure {
    margin-left: calc(var(--tl-col) + 26px);
  }
}

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

/* ══════════ 更新节奏（深色区块） ══════════ */
.page-about .about-cadence {
  background: var(--ink);
  color: var(--paper);
  padding: clamp(34px, 5vw, 78px) 0;
}

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

.page-about .about-cadence .section-head {
  margin-bottom: clamp(20px, 2.8vw, 34px);
}

.page-about .cadence-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: rgba(240, 208, 138, 0.24);
  border-top: 1px solid rgba(240, 208, 138, 0.24);
  border-bottom: 1px solid rgba(240, 208, 138, 0.24);
}

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

.page-about .cadence-item {
  background: var(--ink);
  padding: clamp(20px, 2.6vw, 30px) clamp(16px, 2vw, 24px);
}

.page-about .cadence-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--gold-light);
  margin-bottom: 12px;
}

.page-about .cadence-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 1.9vw, 21px);
  line-height: 1.4;
  color: var(--paper);
  margin: 0 0 10px;
}

.page-about .cadence-text {
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(247, 243, 234, 0.78);
  margin: 0;
}

/* ══════════ 资料体系 ══════════ */
.page-about .archive-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .archive-list li {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 3px;
  padding: 14px 0 14px 18px;
  border-bottom: 1px solid var(--line);
}

@media (min-width: 720px) {
  .page-about .archive-list li {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: 22px;
    align-items: baseline;
  }
}

.page-about .archive-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  width: 9px;
  height: 2px;
  background: var(--gold);
}

.page-about .archive-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16.5px;
  color: var(--text);
}

.page-about .archive-desc {
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--stone);
}

/* ══════════ 团队与协作 ══════════ */
.page-about .about-team-media {
  margin-bottom: 26px;
}

@media (min-width: 1024px) {
  .page-about .about-team-media {
    margin-bottom: 0;
  }
}

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

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

.page-about .role-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
}

.page-about .role-item {
  position: relative;
  padding: 0 0 16px 18px;
  border-left: 2px solid var(--line);
  margin-bottom: 16px;
}

.page-about .role-item:last-child {
  margin-bottom: 0;
}

.page-about .role-item::before {
  content: "";
  position: absolute;
  left: -2px;
  top: 6px;
  width: 2px;
  height: 22px;
  background: var(--gold);
}

.page-about .role-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.4;
  color: var(--text);
  margin: 0 0 6px;
}

.page-about .role-text {
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--stone);
  margin: 0;
}

.page-about .about-team-note {
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.85;
  color: var(--stone);
  margin: 22px 0 0;
  padding: 14px 16px;
  background: var(--paper);
  border-left: 3px solid var(--bronze);
}

/* ══════════ 服务区域与规模 ══════════ */
.page-about .reach-stats {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

@media (min-width: 720px) {
  .page-about .reach-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }
}

.page-about .reach-stats li {
  border-top: 2px solid var(--gold);
  padding-top: 14px;
}

.page-about .reach-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 46px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--gold);
  margin-bottom: 9px;
}

.page-about .reach-label {
  display: block;
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.7;
  color: var(--stone);
}

.page-about .reach-note {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.9;
  color: var(--text);
  margin: 0;
  max-width: 70ch;
}

/* ══════════ 结尾 ══════════ */
.page-about .about-cta {
  padding-bottom: clamp(40px, 6vw, 88px);
}

.page-about .about-cta-inner {
  background: var(--paper);
  border-left: 4px solid var(--gold);
  padding: clamp(24px, 3.4vw, 44px);
  display: grid;
  gap: 14px;
}

.page-about .about-cta-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 2.6vw, 30px);
  line-height: 1.3;
  color: var(--text);
  margin: 0;
}

.page-about .about-cta-text {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.9;
  color: var(--stone);
  margin: 0;
  max-width: 62ch;
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}