.page-about {
  --about-line: rgba(138, 151, 163, 0.24);
  --about-line-strong: rgba(138, 151, 163, 0.46);
  --about-body: rgba(234, 241, 245, 0.82);
  --about-body-soft: rgba(234, 241, 245, 0.68);
  position: relative;
  isolation: isolate;
  color: var(--snow);
  padding-bottom: clamp(40px, 6vw, 92px);
}

.page-about .bs-breadcrumb {
  padding-top: clamp(16px, 2.6vw, 28px);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: rgba(138, 151, 163, 0.92);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(18px, 2.8vw, 34px) 0 clamp(44px, 6vw, 82px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(62% 76% at 88% 0%, rgba(91, 192, 235, 0.15), transparent 66%),
    radial-gradient(54% 66% at 2% 98%, rgba(15, 74, 74, 0.55), transparent 72%);
}

.page-about .about-hero-bg {
  position: absolute;
  z-index: 0;
  top: -6%;
  right: -8%;
  width: min(720px, 72%);
  opacity: 0.2;
  border-radius: var(--radius-lg);
  overflow: hidden;
  pointer-events: none;
}

.page-about .about-hero-bg img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-lg);
  filter: saturate(0.72) contrast(1.06);
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 3.6vw, 42px);
  align-items: start;
}

.page-about .about-hero-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.15rem, 5.4vw, 4.4rem);
  line-height: 1.03;
  letter-spacing: 0.008em;
  margin: 0.16em 0 0.52em;
  text-wrap: balance;
}

.page-about .about-hero-lede {
  max-width: 46ch;
  color: var(--about-body);
  line-height: 1.78;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-facts {
  display: grid;
  gap: 0;
  padding: clamp(6px, 1.4vw, 12px) 0;
}

.page-about .about-fact {
  display: grid;
  grid-template-columns: minmax(64px, auto) minmax(0, 1fr);
  gap: 6px 16px;
  align-items: baseline;
  padding: 13px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-fact:last-child {
  border-bottom: 0;
}

.page-about .about-fact-num {
  font-family: var(--font-mono);
  font-size: clamp(0.95rem, 1.6vw, 1.12rem);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--ice);
}

.page-about .about-fact-txt {
  font-size: 13.5px;
  line-height: 1.62;
  color: var(--about-body-soft);
}

.page-about .about-version-link {
  justify-self: start;
  text-decoration: none;
  transition: box-shadow 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-about .about-version-link:hover,
.page-about .about-version-link:focus-visible {
  box-shadow: 0 0 0 1px rgba(217, 164, 65, 0.7), 0 0 18px rgba(217, 164, 65, 0.35);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  border-top: 1px solid var(--about-line);
}

.page-about .about-section-head {
  max-width: 64ch;
  margin-bottom: clamp(22px, 3.4vw, 40px);
}

.page-about .about-section-head .bs-heading {
  margin-top: 0.34em;
  margin-bottom: 0.5em;
}

.page-about .about-section-lede {
  color: var(--about-body);
  line-height: 1.78;
  margin: 0;
}

/* ---------- 三条服务线 ---------- */
.page-about .about-columns {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-column {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 2.4vw, 26px);
  border-radius: var(--radius);
  border: 1px solid var(--about-line);
  border-top-width: 2px;
  background: linear-gradient(162deg, rgba(22, 56, 77, 0.82), rgba(11, 36, 54, 0.92));
  transition: transform 0.26s var(--ease), border-color 0.26s var(--ease), box-shadow 0.26s var(--ease);
}

.page-about .about-column:hover,
.page-about .about-column:focus-within {
  transform: translateY(-3px);
  border-color: var(--about-line-strong);
  box-shadow: 0 16px 36px -20px rgba(0, 0, 0, 0.92);
}

.page-about .about-column--barley {
  border-top-color: var(--barley);
}

.page-about .about-column--prayer {
  border-top-color: var(--prayer);
}

.page-about .about-column--ice {
  border-top-color: var(--ice);
}

.page-about .about-column-idx {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: rgba(138, 151, 163, 0.95);
}

.page-about .about-column h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.14rem, 1.8vw, 1.36rem);
  letter-spacing: 0.01em;
}

.page-about .about-column p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--about-body);
}

.page-about .about-arrow {
  margin-top: auto;
  padding-top: 8px;
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--ice);
  text-decoration: none;
  align-self: flex-start;
  border-bottom: 1px solid transparent;
  transition: border-color 0.22s var(--ease), color 0.22s var(--ease);
}

.page-about .about-arrow:hover,
.page-about .about-arrow:focus-visible {
  border-bottom-color: var(--ice);
}

/* ---------- 双栏图文 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.6vw, 44px);
  align-items: center;
}

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

.page-about .about-figure .bs-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--about-line);
}

.page-about .about-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.82) contrast(1.04);
}

.page-about .about-split-body {
  display: grid;
  gap: 16px;
  min-width: 0;
}

/* ---------- 跨端要点 ---------- */
.page-about .about-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-points li {
  display: grid;
  gap: 8px;
  padding: 16px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-points li:last-child {
  border-bottom: 0;
}

.page-about .about-point-tag {
  justify-self: start;
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .about-points p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-body);
}

/* ---------- 维护节奏 ---------- */
.page-about .about-rhythm {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.page-about .about-rhythm li {
  display: grid;
  grid-template-columns: minmax(72px, auto) minmax(0, 1fr);
  gap: 4px 18px;
  align-items: start;
  padding: 15px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-rhythm li:first-child {
  border-top: 1px solid var(--about-line);
}

.page-about .rhythm-key {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--gold);
  padding-top: 3px;
  white-space: nowrap;
}

.page-about .about-rhythm p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--about-body);
}

.page-about .about-note {
  margin-top: 20px;
  padding: clamp(16px, 2.2vw, 22px);
  border-radius: var(--radius);
  border: 1px solid rgba(138, 151, 163, 0.3);
  background: rgba(22, 56, 77, 0.46);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: border-color 0.24s var(--ease), background-color 0.24s var(--ease);
}

.page-about .about-note:focus-visible {
  outline: 2px solid var(--ice);
  outline-offset: 3px;
}

.page-about .about-note:hover {
  border-color: rgba(91, 192, 235, 0.55);
  background: rgba(22, 56, 77, 0.62);
}

.page-about .about-note-label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--barley);
}

.page-about .about-note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--about-body);
}

/* ---------- 团队数据 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .about-stat {
  padding: 16px 16px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--about-line);
  border-top-width: 2px;
  background: rgba(11, 36, 54, 0.74);
}

.page-about .about-stat:nth-child(1) {
  border-top-color: var(--barley);
}

.page-about .about-stat:nth-child(2) {
  border-top-color: var(--prayer);
}

.page-about .about-stat:nth-child(3) {
  border-top-color: var(--ice);
}

.page-about .about-stat:nth-child(4) {
  border-top-color: var(--gold);
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  letter-spacing: 0.02em;
  color: var(--snow);
}

.page-about .about-stat-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.58;
  color: rgba(138, 151, 163, 0.96);
}

.page-about .about-team-copy {
  margin-top: clamp(22px, 3.2vw, 34px);
  display: grid;
  gap: 14px;
  max-width: 74ch;
}

.page-about .about-team-copy p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-body);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 32px;
  display: grid;
  gap: 2px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 14px;
  bottom: 18px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, rgba(91, 192, 235, 0.62) 0%, rgba(138, 151, 163, 0.24) 56%, rgba(138, 151, 163, 0.06) 100%);
}

.page-about .about-tl-item {
  position: relative;
  padding: 12px 14px 14px;
  border-radius: 12px;
  transition: background-color 0.24s var(--ease);
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 21px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--abyss);
  border: 2px solid var(--ice);
  box-shadow: 0 0 0 3px rgba(7, 28, 44, 0.95), 0 0 12px rgba(91, 192, 235, 0.42);
  transition: background-color 0.24s var(--ease), box-shadow 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-about .about-tl-item:hover,
.page-about .about-tl-item:focus-within {
  background: rgba(22, 56, 77, 0.42);
}

.page-about .about-tl-item:hover::before,
.page-about .about-tl-item:focus-within::before {
  background: var(--ice);
  box-shadow: 0 0 0 3px rgba(7, 28, 44, 0.95), 0 0 22px rgba(91, 192, 235, 0.85);
  transform: scale(1.14);
}

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

.page-about .about-tl-item--current::before {
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(7, 28, 44, 0.95), 0 0 16px rgba(217, 164, 65, 0.55);
}

.page-about .about-tl-year {
  display: block;
  margin-bottom: 5px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ice);
}

.page-about .about-tl-item--current .about-tl-year {
  color: var(--gold);
}

.page-about .about-tl-item h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.06rem, 1.7vw, 1.3rem);
  letter-spacing: 0.01em;
}

.page-about .about-tl-sum {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--about-body);
}

.page-about .about-tl-detail {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition: grid-template-rows 0.36s var(--ease), opacity 0.3s var(--ease), margin-top 0.3s var(--ease);
  margin-top: 0;
}

.page-about .about-tl-detail > p {
  overflow: hidden;
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--about-body-soft);
}

.page-about .about-tl-item:hover .about-tl-detail,
.page-about .about-tl-item:focus-within .about-tl-detail {
  grid-template-rows: 1fr;
  opacity: 1;
  margin-top: 10px;
}

.page-about .about-tl-detail .about-version-link {
  margin-top: 10px;
  display: inline-block;
}

@media (hover: none) {
  .page-about .about-tl-detail {
    grid-template-rows: 1fr;
    opacity: 1;
    margin-top: 10px;
  }
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  margin-top: clamp(28px, 4.6vw, 60px);
  padding: clamp(22px, 3.6vw, 40px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--about-line-strong);
  background: linear-gradient(122deg, rgba(22, 56, 77, 0.92), rgba(7, 28, 44, 0.96));
  display: grid;
  gap: 22px;
  align-items: start;
}

.page-about .about-cta .bs-heading {
  margin-top: 0.3em;
  margin-bottom: 0.55em;
}

.page-about .about-cta-text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-body);
}

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

/* ---------- 响应式 ---------- */
@media (max-width: 720px) {
  .page-about .about-hero-bg {
    width: 132%;
    right: -30%;
    top: -6%;
    opacity: 0.12;
  }
}

@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.45fr) auto;
    align-items: center;
  }
}

@media (min-width: 780px) {
  .page-about .about-columns {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.48fr) minmax(240px, 0.66fr);
    align-items: end;
    gap: clamp(30px, 4vw, 64px);
  }

  .page-about .about-facts {
    border-left: 1px solid var(--about-line);
    padding-left: clamp(16px, 2.2vw, 26px);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: center;
  }

  .page-about .about-split--flip > .about-split-body {
    order: 2;
  }

  .page-about .about-timeline {
    padding-left: 42px;
  }

  .page-about .about-tl-item {
    padding: 14px 20px 16px;
  }

  .page-about .about-tl-item::before {
    left: -34px;
  }
}

@media (min-width: 1120px) {
  .page-about .about-columns {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-column,
  .page-about .about-tl-item,
  .page-about .about-tl-item::before,
  .page-about .about-tl-detail,
  .page-about .about-note {
    transition: none;
  }

  .page-about .about-column:hover {
    transform: none;
  }
}