.page-about {
  --about-line: rgba(30, 42, 68, 0.14);
  --about-narrow: 60ch;
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.page-about .about-head {
  max-width: var(--about-narrow);
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-head .lede {
  margin-top: 14px;
  font-family: var(--font-body);
  color: var(--indigo);
}

/* ---------- 首屏 ---------- */
.page-about .about-intro {
  padding-top: clamp(20px, 4vw, 40px);
  padding-bottom: clamp(32px, 5vw, 60px);
  background:
    radial-gradient(120% 90% at 92% -10%, rgba(231, 111, 60, 0.16), transparent 60%),
    var(--cream);
}

.page-about .breadcrumbs {
  margin-bottom: clamp(16px, 3vw, 26px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--grey);
}

.page-about .about-intro__frame {
  padding: clamp(20px, 4vw, 44px);
  border-radius: var(--radius);
  background: linear-gradient(155deg, #FDF7EE 0%, var(--orange-soft) 62%, #F2E3D1 100%);
  box-shadow: var(--shadow);
}

.page-about .about-intro__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-intro__copy .display-title {
  margin: 12px 0 18px;
  font-family: var(--font-display);
  font-size: clamp(38px, 7.2vw, 76px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-intro__copy .lede {
  max-width: 46ch;
  font-size: clamp(16px, 2.1vw, 18px);
  line-height: 1.85;
  color: var(--indigo);
}

.page-about .about-intro__copy .btn-group {
  margin-top: 26px;
}

.page-about .about-intro__side {
  padding: clamp(18px, 3vw, 26px);
  border-radius: var(--radius-sm);
  background: var(--glass);
  border: 1px solid rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(8px);
}

.page-about .about-intro__facts {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
  font-size: 15px;
  color: var(--ink);
}

.page-about .about-intro__facts li {
  position: relative;
  padding-left: 18px;
  line-height: 1.6;
}

.page-about .about-intro__facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: 1.5px solid var(--grass);
}

.page-about .about-intro__hint {
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: 1px dashed var(--about-line);
  font-family: var(--font-ui);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--grey);
}

/* ---------- 数字信息条 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

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

.page-about .about-stat__body {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 6px;
  padding: 14px 16px 16px;
  text-decoration: none;
  color: var(--ink);
  height: 100%;
  transition: background 0.25s ease;
}

.page-about a.about-stat__body:hover,
.page-about a.about-stat__body:focus-visible {
  background: var(--orange-soft);
}

.page-about .about-stat__num {
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 700;
  line-height: 1;
  color: var(--indigo);
}

.page-about .about-stat__unit {
  font-family: var(--font-ui);
  font-size: 12px;
  color: var(--grey);
}

.page-about .about-stat__label {
  flex-basis: 100%;
  font-family: var(--font-ui);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--grey);
}

.page-about .about-stat__go {
  margin-left: auto;
  font-size: 12px;
  color: var(--amber);
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.page-about a.about-stat__body:hover .about-stat__go,
.page-about a.about-stat__body:focus-visible .about-stat__go {
  opacity: 1;
  transform: translateX(0);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding: clamp(46px, 8vw, 96px) 0;
}

.page-about .about-section--journey {
  background: var(--cream);
}

.page-about .about-section--threads {
  background: linear-gradient(180deg, var(--cream) 0%, #FBF4E7 100%);
}

.page-about .about-section--team {
  background: var(--paper);
}

.page-about .about-section--version {
  background: linear-gradient(180deg, #FBF4E7 0%, var(--orange-soft) 140%);
}

.page-about .about-section--support {
  background: var(--cream);
}

.page-about .about-section--eco {
  background: var(--paper);
}

/* ---------- 时间轴 ---------- */
.page-about .about-journey {
  display: grid;
  gap: clamp(28px, 5vw, 52px);
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 42px;
  display: grid;
  gap: clamp(26px, 4vw, 46px);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--amber), var(--orange), rgba(91, 127, 82, 0.55));
  border-radius: 2px;
}

.page-about .about-phase {
  position: relative;
}

.page-about .about-phase__marker {
  position: absolute;
  left: -42px;
  top: 0;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--paper);
  border: 1.5px solid var(--amber);
  color: var(--indigo);
  font-size: 11px;
  line-height: 1;
  box-shadow: 0 0 0 4px var(--cream);
}

.page-about .about-phase--current .about-phase__marker {
  border-color: var(--grass);
  color: var(--grass);
}

.page-about .about-phase__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.6vw, 23px);
  line-height: 1.35;
  color: var(--ink);
}

.page-about .about-phase__text {
  max-width: 52ch;
  margin: 0;
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--indigo);
}

.page-about .about-phase__meta {
  margin: 12px 0 0;
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--grey);
}

.page-about .about-journey__media {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: linear-gradient(160deg, var(--orange-soft), #EFDCC8);
}

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

.page-about .media__caption {
  padding: 12px 16px 16px;
  font-family: var(--font-ui);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--grey);
}

/* ---------- 四条线索 ---------- */
.page-about .about-threads {
  display: grid;
  gap: clamp(16px, 2.5vw, 22px);
}

.page-about .about-thread {
  position: relative;
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--radius);
  background: var(--paper);
  border: 1px solid var(--about-line);
  border-left: 4px solid var(--orange);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-about .about-thread--two {
  border-left-color: var(--indigo);
}

.page-about .about-thread--three {
  border-left-color: var(--grass);
}

.page-about .about-thread--four {
  border-left-color: var(--amber);
}

.page-about .about-thread:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.page-about .about-thread__no {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--grey);
}

.page-about .about-thread__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.4vw, 22px);
  color: var(--ink);
}

.page-about .about-thread__text {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--indigo);
}

.page-about .about-thread__link {
  font-family: var(--font-ui);
  font-size: 14px;
  font-weight: 600;
  color: var(--indigo);
  text-decoration: none;
  border-bottom: 1.5px solid var(--amber);
  padding-bottom: 2px;
  transition: color 0.25s ease, border-color 0.25s ease;
}

.page-about .about-thread__link:hover,
.page-about .about-thread__link:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-team__media {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: linear-gradient(160deg, #EFE6D6, var(--orange-soft));
}

.page-about .about-team__list {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(24px, 3.5vw, 34px);
}

.page-about .about-team__item {
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid var(--about-line);
  backdrop-filter: blur(6px);
  overflow: hidden;
}

.page-about .about-team__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-ui);
}

.page-about .about-team__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-team__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--amber);
  transition: transform 0.25s ease;
}

.page-about .about-team__item[open] .about-team__summary::after {
  content: "−";
}

.page-about .about-team__name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-team__brief {
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--grey);
}

.page-about .about-team__detail {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--indigo);
}

.page-about .about-flow {
  padding: clamp(18px, 3vw, 26px);
  border-radius: var(--radius);
  border: 1px dashed rgba(231, 111, 60, 0.55);
  background: linear-gradient(140deg, rgba(249, 217, 199, 0.5), rgba(255, 253, 248, 0.9));
}

.page-about .about-flow__label {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-about .about-flow__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-flow__steps li {
  display: flex;
  gap: 12px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-flow__steps .mono {
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--indigo);
  color: var(--cream);
  font-size: 11px;
}

/* ---------- 版本治理 ---------- */
.page-about .about-version {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
}

.page-about .about-version .info-bar {
  margin-bottom: 20px;
}

.page-about .about-version__text {
  max-width: 54ch;
  margin: 0 0 16px;
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--indigo);
}

.page-about .about-checklist {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(30, 42, 68, 0.1);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .about-checklist .checklist__item {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding: 13px 16px;
  background: var(--paper);
  font-family: var(--font-ui);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-checklist .checklist__mark {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--grass);
  letter-spacing: 0.06em;
}

.page-about .about-version__media {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: linear-gradient(150deg, #E9DCC8, #F3D5C0);
}

/* ---------- 服务范围 ---------- */
.page-about .about-support {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-support__text {
  max-width: 54ch;
  margin: 16px 0 24px;
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--indigo);
}

.page-about .about-support__card {
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.75);
}

.page-about .about-support__card-label {
  margin: 0 0 14px;
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .about-support__contact {
  margin: 0;
  display: grid;
  gap: 4px;
}

.page-about .about-support__contact dt {
  font-family: var(--font-ui);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--grey);
}

.page-about .about-support__contact dd {
  margin: 0 0 12px;
  font-family: var(--font-ui);
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  word-break: break-word;
}

.page-about .about-support__contact dd a {
  color: var(--indigo);
  text-decoration: none;
  border-bottom: 1px solid rgba(217, 154, 43, 0.6);
}

.page-about .about-support__contact dd a:hover,
.page-about .about-support__contact dd a:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

.page-about .about-support__note {
  margin: 14px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--about-line);
  font-family: var(--font-ui);
  font-size: 13px;
  line-height: 1.75;
  color: var(--grey);
}

/* ---------- 合作与认可 ---------- */
.page-about .about-eco {
  display: grid;
  gap: clamp(14px, 2.5vw, 22px);
}

.page-about .about-eco__item {
  padding: clamp(20px, 3vw, 26px);
  border-radius: var(--radius);
  border: 1px solid var(--about-line);
  background: var(--cream);
}

.page-about .about-eco__num {
  margin: 0 0 10px;
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 700;
  color: var(--orange);
  line-height: 1.1;
}

.page-about .about-eco__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .about-eco__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--indigo);
}

/* ---------- 结尾 CTA ---------- */
.page-about .about-cta {
  margin-top: clamp(28px, 4vw, 46px);
  padding: clamp(24px, 4vw, 38px);
  border-radius: var(--radius);
  display: grid;
  gap: 20px;
  align-items: center;
  background: linear-gradient(130deg, rgba(249, 217, 199, 0.85), rgba(255, 253, 248, 0.9));
  border: 1px solid rgba(231, 111, 60, 0.35);
}

.page-about .about-cta__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 25px);
  color: var(--ink);
}

.page-about .about-cta__text p {
  margin: 0;
  max-width: 46ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--indigo);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-intro__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

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

  .page-about .about-thread--one {
    transform: translateY(0);
  }

  .page-about .about-thread--two {
    transform: translateY(28px);
  }

  .page-about .about-thread--two:hover {
    transform: translateY(24px);
  }

  .page-about .about-thread--three {
    transform: translateY(-6px);
  }

  .page-about .about-thread--three:hover {
    transform: translateY(-10px);
  }

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

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

@media (min-width: 980px) {
  .page-about .about-journey {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-team__media {
    order: 0;
  }

  .page-about .about-version {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-support {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(7, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-thread,
  .page-about .about-team__summary::after,
  .page-about .about-stat__go {
    transition: none !important;
  }

  .page-about .about-thread--two,
  .page-about .about-thread--three {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>