.page-about {
  --about-rail-w: 218px;
  --about-soft: rgba(11, 36, 31, 0.06);
  background: var(--ivory);
  color: var(--charcoal);
  font-family: var(--sans);
  line-height: 1.75;
  font-size: 16px;
}

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

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--serif);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.28;
  margin: 0;
}

.page-about p {
  margin: 0;
}

.page-about a {
  color: inherit;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink-green);
  color: var(--ivory);
  padding: 22px 0 48px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -14%;
  bottom: -34%;
  width: 74%;
  height: 92%;
  background: linear-gradient(158deg, rgba(198, 161, 91, 0.26), rgba(198, 161, 91, 0) 66%);
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--gold) 0%, rgba(198, 161, 91, 0.18) 46%, rgba(198, 161, 91, 0) 100%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 26px;
  padding: 0;
  list-style: none;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: rgba(247, 242, 231, 0.6);
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(198, 161, 91, 0.7);
}

.page-about .breadcrumbs a {
  color: var(--gold-light);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 160ms ease;
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  border-bottom-color: var(--gold-light);
}

.page-about .about-hero__kicker {
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--gold);
  margin-bottom: 16px;
}

.page-about .about-hero h1 {
  font-size: clamp(29px, 7.2vw, 54px);
  max-width: 15em;
  letter-spacing: 0.05em;
}

.page-about .about-hero__lead {
  margin-top: 20px;
  max-width: 54ch;
  font-size: 16px;
  color: rgba(247, 242, 231, 0.82);
}

.page-about .about-hero__stats {
  display: grid;
  gap: 18px;
  margin-top: 34px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.page-about .hero-stat__num {
  font-family: var(--serif);
  font-size: 34px;
  line-height: 1.1;
  color: var(--gold-light);
  letter-spacing: 0.02em;
}

.page-about .hero-stat__num span {
  font-size: 15px;
  margin-left: 4px;
  color: rgba(227, 201, 143, 0.78);
  letter-spacing: 0.06em;
}

.page-about .hero-stat__label {
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(247, 242, 231, 0.66);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  padding-top: 42px;
  padding-bottom: 8px;
}

.page-about .about-rail {
  align-self: start;
  border-top: 1px solid var(--line-strong);
  padding-top: 16px;
}

.page-about .about-rail__label {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--moss);
  margin-bottom: 12px;
}

.page-about .about-rail__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
}

.page-about .about-rail__list li {
  min-width: 0;
}

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  background: var(--sand);
  color: var(--deep-green);
  font-size: 13px;
  text-decoration: none;
  transition: border-color 160ms ease, background-color 160ms ease, color 160ms ease;
}

.page-about .about-rail__list a span {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--moss);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  border-color: var(--gold);
  background: var(--ivory);
}

.page-about .about-rail__cta {
  display: inline-block;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  margin-bottom: 58px;
  scroll-margin-top: 24px;
}

.page-about .sec-head {
  margin-bottom: 22px;
}

.page-about .sec-head__num {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--moss);
  margin-bottom: 10px;
}

.page-about .sec-head h2 {
  font-size: clamp(23px, 5.4vw, 34px);
  color: var(--ink-green);
  max-width: 22em;
}

.page-about .sec-sub {
  margin-top: 12px;
  max-width: 62ch;
  color: rgba(26, 26, 24, 0.78);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
  background: var(--sand);
  border: 1px solid var(--line);
  padding: 10px;
}

.page-about .about-figure img {
  width: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.02);
}

.page-about .about-figure--wide img {
  aspect-ratio: 8 / 5;
}

.page-about .about-figure--square img {
  aspect-ratio: 5 / 4;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--stone);
  line-height: 1.6;
}

/* ---------- 品牌起点 ---------- */
.page-about .origin-grid {
  display: grid;
  gap: 22px;
}

.page-about .origin-text p + p {
  margin-top: 14px;
}

.page-about .origin-text p {
  color: rgba(26, 26, 24, 0.86);
}

/* ---------- 手风琴 ---------- */
.page-about .about-acc {
  border-top: 1px solid var(--line-strong);
}

.page-about .about-acc__item {
  border-bottom: 1px solid var(--line);
}

.page-about .about-acc__trigger {
  width: 100%;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 16px 2px;
  background: none;
  border: 0;
  text-align: left;
  cursor: pointer;
  font-family: var(--serif);
  color: var(--ink-green);
  transition: color 160ms ease;
}

.page-about .about-acc__trigger:hover,
.page-about .about-acc__trigger:focus-visible {
  color: var(--moss);
}

.page-about .about-acc__num {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--moss);
  padding-top: 3px;
}

.page-about .about-acc__title {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .about-acc__hint {
  display: none;
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--stone);
}

.page-about .about-acc__icon {
  position: relative;
  width: 16px;
  height: 16px;
  border: 1px solid var(--gold);
  transform: rotate(45deg);
  transition: transform 240ms ease, background-color 240ms ease;
}

.page-about .about-acc__trigger[aria-expanded="true"] .about-acc__icon {
  background: var(--gold);
  transform: rotate(135deg);
}

.page-about .about-acc__panel {
  padding: 0 2px 18px;
  color: rgba(26, 26, 24, 0.82);
  max-width: 66ch;
}

.page-about .about-acc__panel p {
  margin: 0;
}

.page-about .about-acc__item--plain {
  border-bottom: 0;
  margin-top: 10px;
}

.page-about .about-acc__trigger--small {
  padding: 8px 0 8px 12px;
  border-left: 2px solid var(--gold);
  color: var(--deep-green);
}

.page-about .about-acc__trigger--small .about-acc__title {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
}

.page-about .about-acc__trigger--small .about-acc__icon {
  width: 12px;
  height: 12px;
}

/* ---------- 权益 ---------- */
.page-about .tier-grid {
  display: grid;
  gap: 14px;
}

.page-about .tier-card {
  padding: 22px;
  background: var(--ivory);
  border: 1px solid var(--line);
  box-shadow: 0 10px 24px rgba(11, 36, 31, 0.05);
}

.page-about .tier-card__code {
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--moss);
  margin-bottom: 10px;
}

.page-about .tier-card h3 {
  font-size: 19px;
  color: var(--ink-green);
  margin-bottom: 10px;
}

.page-about .tier-card p {
  color: rgba(26, 26, 24, 0.8);
  font-size: 15px;
}

.page-about .tier-card--deep {
  background: var(--deep-green);
  border-color: var(--line-strong);
  color: var(--ivory);
}

.page-about .tier-card--deep h3,
.page-about .tier-card--deep .tier-card__code {
  color: var(--gold-light);
}

.page-about .tier-card--deep h3 {
  margin-bottom: 12px;
}

.page-about .tier-card--deep p {
  color: rgba(247, 242, 231, 0.82);
}

.page-about .tier-card--account {
  background: var(--sand);
  border-color: var(--gold);
}

.page-about .tier-card--account .btn {
  margin-top: 16px;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 22px;
}

.page-about .role-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-strong);
}

.page-about .role-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px dashed var(--line);
}

.page-about .role-list__num {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--moss);
  padding-top: 4px;
}

.page-about .role-list h3 {
  font-size: 16px;
  color: var(--ink-green);
  margin-bottom: 4px;
}

.page-about .role-list p {
  font-size: 14.5px;
  color: rgba(26, 26, 24, 0.78);
}

/* ---------- 品质 ---------- */
.page-about .standards-grid {
  display: grid;
  gap: 22px;
}

.page-about .std-item {
  position: relative;
  padding: 14px 0 14px 18px;
  border-left: 2px solid var(--gold-light);
}

.page-about .std-item:first-child {
  border-left-color: var(--cinnabar);
}

.page-about .std-item h3 {
  font-size: 16px;
  color: var(--ink-green);
  margin-bottom: 6px;
}

.page-about .std-item p {
  font-size: 14.5px;
  color: rgba(26, 26, 24, 0.78);
}

.page-about .std-item a {
  color: var(--moss);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
}

.page-about .std-item a:hover,
.page-about .std-item a:focus-visible {
  border-bottom-color: var(--moss);
}

/* ---------- 阶段时间轴 ---------- */
.page-about .stage-timeline {
  position: relative;
  margin-left: 5px;
  padding-left: 20px;
  border-left: 1px solid var(--line-strong);
}

.page-about .about-acc--stage {
  border-top: 0;
}

.page-about .stage {
  position: relative;
  padding-bottom: 26px;
}

.page-about .stage__marker {
  position: absolute;
  left: -27px;
  top: 8px;
  width: 12px;
  height: 12px;
  background: var(--ink-green);
  border: 1px solid var(--gold);
  transform: rotate(45deg);
}

.page-about .stage__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 8px;
}

.page-about .stage__name {
  font-family: var(--serif);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--ink-green);
}

.page-about .stage__tag {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--moss);
  border: 1px solid var(--line);
  padding: 2px 8px;
  background: var(--sand);
}

.page-about .stage__lead {
  color: rgba(26, 26, 24, 0.82);
  max-width: 62ch;
}

.page-about .stage .about-acc__item {
  border-bottom: 0;
}

.page-about .stage .about-acc__panel {
  padding-bottom: 6px;
  font-size: 14.5px;
}

/* ---------- 指标 ---------- */
.page-about .metric-row {
  display: grid;
  gap: 18px;
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--line-strong);
}

.page-about .metric {
  border-top: 2px solid var(--line);
  padding-top: 12px;
  transition: border-color 180ms ease;
  outline-offset: 6px;
}

.page-about .metric:hover,
.page-about .metric:focus-visible {
  border-top-color: var(--gold);
}

.page-about .metric__num {
  font-family: var(--serif);
  font-size: 32px;
  line-height: 1.1;
  color: var(--ink-green);
  letter-spacing: 0.02em;
}

.page-about .metric__num span {
  font-size: 14px;
  margin-left: 3px;
  color: var(--moss);
  letter-spacing: 0.06em;
}

.page-about .metric__label {
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--stone);
}

.page-about .metric__note {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--stone);
  transition: color 180ms ease;
}

.page-about .metric:hover .metric__note,
.page-about .metric:focus-visible .metric__note {
  color: var(--charcoal);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  margin-top: 10px;
  background: var(--ink-green);
  color: var(--ivory);
  padding: 40px 0 44px;
  position: relative;
  overflow: hidden;
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  left: -10%;
  top: -40%;
  width: 60%;
  height: 160%;
  background: linear-gradient(120deg, rgba(198, 161, 91, 0.2), rgba(198, 161, 91, 0) 70%);
  clip-path: polygon(0 0, 68% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-cta__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 22px;
}

.page-about .about-cta h2 {
  font-size: clamp(22px, 5vw, 30px);
  color: var(--ivory);
  margin-bottom: 10px;
}

.page-about .about-cta p {
  color: rgba(247, 242, 231, 0.8);
  max-width: 52ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-cta__actions .btn {
  text-decoration: none;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 720px) {
  .page-about .about-acc__trigger {
    grid-template-columns: auto minmax(0, 0.9fr) minmax(0, 1fr) auto;
    gap: 18px;
  }

  .page-about .about-acc__hint {
    display: block;
  }

  .page-about .about-hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .hero-stat + .hero-stat {
    border-left: 1px solid var(--line);
    padding-left: 24px;
  }

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

  .page-about .tier-card--deep,
  .page-about .tier-card--account {
    grid-column: 1 / -1;
  }

  .page-about .tier-card--deep {
    display: grid;
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    gap: 20px;
    align-items: start;
  }

  .page-about .metric-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: center;
  }

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

@media (min-width: 980px) {
  .page-about .about-hero {
    padding: 26px 0 68px;
  }

  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 52px;
    padding-top: 56px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 28px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 2px;
  }

  .page-about .about-rail__list a {
    width: 100%;
    justify-content: flex-start;
    border: 0;
    border-bottom: 1px solid var(--line);
    background: none;
    padding: 10px 2px;
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    background: var(--sand);
    border-bottom-color: var(--gold);
    padding-left: 8px;
  }

  .page-about .team-grid,
  .page-about .standards-grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .team-grid .about-figure {
    order: 2;
  }

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

  .page-about .about-section {
    margin-bottom: 74px;
  }

  .page-about .stage-timeline {
    margin-left: 8px;
    padding-left: 30px;
  }

  .page-about .stage__marker {
    left: -37px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-acc__icon,
  .page-about .metric,
  .page-about .metric__note,
  .page-about .about-acc__trigger,
  .page-about .about-rail__list a {
    transition: none;
  }
}