.page-about {
  --about-gap: clamp(1.25rem, 3vw, 2.5rem);
  --about-line-soft: rgba(49, 85, 76, 0.72);
  --about-text-soft: rgba(244, 239, 228, 0.8);
  --about-text-dim: rgba(244, 239, 228, 0.68);
  color: var(--paper);
  background:
    radial-gradient(110% 70% at 92% -8%, var(--cyan-06), transparent 62%),
    radial-gradient(90% 60% at 0% 4%, rgba(11, 36, 29, 0.92), transparent 70%),
    var(--ink);
}

.page-about .about-wrap {
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--pad);
  padding-block: clamp(1rem, 3vw, 1.75rem) clamp(3rem, 7vw, 5.5rem);
}

.page-about .breadcrumb {
  margin-block: 0.35rem 1.5rem;
}

.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(0.5rem, 2vw, 1.2rem) clamp(2rem, 5vw, 3.4rem);
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-hero__title {
  margin: 0.55rem 0 1.1rem;
  font-family: var(--font-display);
  font-size: clamp(2.05rem, 5.4vw, 3.8rem);
  line-height: 1.07;
  letter-spacing: -0.02em;
  max-width: 22ch;
}

.page-about .about-hero__lead {
  margin: 0 0 1.6rem;
  max-width: 54ch;
  font-size: clamp(0.98rem, 1.5vw, 1.1rem);
  line-height: 1.85;
  color: var(--about-text-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.5rem);
  padding-top: clamp(1.5rem, 3vw, 2.5rem);
}

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

/* ---------- 页边注 ---------- */
.page-about .about-margin {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding-bottom: 0.6rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-margin__label {
  flex: 0 0 auto;
  padding-right: 0.65rem;
  border-right: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--sage);
}

.page-about .about-margin__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  padding: 0.34rem 0.72rem;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  font-size: 0.82rem;
  color: rgba(244, 239, 228, 0.72);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .about-margin__link:hover,
.page-about .about-margin__link:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan-40);
  background: var(--cyan-06);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding-block: clamp(1.75rem, 4vw, 3rem);
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-section__title {
  margin: 0.45rem 0 0.9rem;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3.2vw, 2.2rem);
  line-height: 1.16;
  letter-spacing: -0.015em;
  max-width: 26ch;
}

.page-about .about-lead {
  margin: 0 0 1.5rem;
  max-width: 60ch;
  line-height: 1.82;
  color: var(--about-text-soft);
}

.page-about .about-split {
  display: grid;
  gap: var(--about-gap);
}

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

.page-about .about-body p {
  margin: 0 0 1rem;
  line-height: 1.85;
  color: var(--about-text-soft);
}

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--deep);
}

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

.page-about .about-figure__caption {
  padding: 0.85rem 1.1rem 1rem;
  border-top: 1px solid var(--line);
  font-size: 0.78rem;
  line-height: 1.65;
  color: var(--sage);
}

.page-about .about-quote {
  margin: 1.4rem 0 0;
  padding: 0.1rem 0 0.1rem 1.05rem;
  border-left: 2px solid var(--amber);
  font-size: 0.96rem;
  line-height: 1.82;
  color: rgba(244, 239, 228, 0.92);
}

/* ---------- 分区示意 ---------- */
.page-about .about-map {
  display: block;
  width: 100%;
  height: auto;
  margin: 1.4rem 0 1.7rem;
}

/* ---------- 三组职能卡（错层） ---------- */
.page-about .about-desks {
  display: grid;
  gap: 1rem;
}

.page-about .about-desk {
  position: relative;
  padding: clamp(1.1rem, 2.4vw, 1.6rem);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(158deg, var(--moss) 0%, var(--deep) 62%, var(--ink) 100%);
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .about-desk--c {
  border-radius: var(--r-lg);
}

.page-about .about-desk:hover,
.page-about .about-desk:focus-within {
  transform: translateY(-4px);
  border-color: var(--cyan-40);
  box-shadow: 0 20px 44px -30px rgba(88, 242, 208, 0.55);
}

.page-about .about-desk__num {
  margin: 0 0 0.35rem;
  font-family: var(--font-mono);
  font-size: 1.55rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-desk--b .about-desk__num {
  color: var(--amber);
}

.page-about .about-desk h3 {
  margin: 0 0 0.55rem;
  font-size: 1.06rem;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-desk p {
  margin: 0 0 0.95rem;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--about-text-soft);
}

.page-about .about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tags li {
  padding: 0.24rem 0.62rem;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: var(--cyan-06);
  font-size: 0.74rem;
  color: var(--sage);
}

/* ---------- 维护节奏面板 ---------- */
.page-about .about-panel {
  display: grid;
  gap: 1rem;
  margin-top: 1.4rem;
  padding: clamp(1.1rem, 2.6vw, 1.7rem);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background:
    radial-gradient(120% 150% at 0% 0%, var(--cyan-06), transparent 58%),
    var(--deep);
}

.page-about .about-panel__row {
  padding-top: 0.85rem;
  border-top: 1px solid var(--line);
}

.page-about .about-panel__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.69rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--sage);
}

.page-about .about-panel__value {
  display: block;
  margin: 0.4rem 0 0.45rem;
  font-family: var(--font-mono);
  font-size: 1.32rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-panel__note {
  margin: 0;
  font-size: 0.83rem;
  line-height: 1.72;
  color: var(--about-text-dim);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline-block {
  position: relative;
  margin-top: 1.5rem;
  padding: clamp(1.2rem, 3vw, 2rem);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--deep);
}

.page-about .about-timeline-block__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.22;
  pointer-events: none;
}

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

.page-about .about-timeline-block::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(11, 36, 29, 0.55), rgba(16, 22, 20, 0.9) 72%);
}

.page-about .about-timeline {
  --tl-pad: 2.3rem;
  --tl-x: 0.7rem;
  position: relative;
  z-index: 2;
  display: grid;
  gap: 1.6rem;
  margin: 0;
  padding: 0 0 0 var(--tl-pad);
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: var(--tl-x);
  top: 0.55rem;
  bottom: 0.55rem;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan-40), var(--line));
}

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

.page-about .about-step::before {
  content: "";
  position: absolute;
  left: calc(var(--tl-x) - var(--tl-pad) - 6px);
  top: 0.4rem;
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  border: 2px solid var(--cyan);
  border-radius: 50%;
  background: var(--deep);
  transition: background 0.2s var(--ease), box-shadow 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-step:hover::before,
.page-about .about-step:focus-within::before {
  background: var(--cyan);
  box-shadow: 0 0 0 5px var(--cyan-12);
}

.page-about .about-step__year {
  display: inline-block;
  margin-bottom: 0.18rem;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .about-step__title {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-step__text {
  margin: 0;
  max-width: 54ch;
  font-size: 0.88rem;
  line-height: 1.78;
  color: rgba(244, 239, 228, 0.76);
}

/* ---------- 四点理由 ---------- */
.page-about .about-reasons {
  display: grid;
  gap: 0.85rem;
  margin-top: 1.4rem;
}

.page-about .about-reason {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.85rem;
  padding: 1.05rem 1.15rem 1.15rem;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(21, 59, 49, 0.42);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-reason:hover {
  border-color: var(--cyan-40);
  background: rgba(21, 59, 49, 0.66);
}

.page-about .about-reason__num {
  font-family: var(--font-mono);
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--amber);
}

.page-about .about-reason h3 {
  margin: 0 0 0.3rem;
  font-size: 0.98rem;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-reason p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--about-text-dim);
}

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

.page-about .about-team .about-body p:last-of-type {
  margin-bottom: 1.4rem;
}

.page-about .about-side {
  padding: 1.15rem 1.2rem 1.3rem;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(196deg, rgba(14, 59, 54, 0.85), var(--deep));
}

.page-about .about-side__title {
  margin: 0 0 0.85rem;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--sage);
}

.page-about .about-side__list {
  margin: 0 0 1.15rem;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.75rem;
}

.page-about .about-side__list li {
  padding-left: 0.85rem;
  border-left: 2px solid var(--line);
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--about-text-dim);
}

.page-about .about-side__list span {
  display: block;
  margin-bottom: 0.12rem;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-side__link {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-40);
  padding-bottom: 0.12rem;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .about-side__link:hover,
.page-about .about-side__link:focus-visible {
  color: var(--paper);
  border-color: var(--amber);
}

/* ---------- 收束 ---------- */
.page-about .about-close {
  display: grid;
  margin-top: clamp(2rem, 5vw, 3.5rem);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .about-close__text {
  padding: clamp(1.3rem, 3vw, 2.2rem);
  background:
    radial-gradient(130% 130% at 100% 0%, var(--cyan-12), transparent 60%),
    var(--teal);
}

.page-about .about-close__title {
  margin: 0 0 0.7rem;
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2.6vw, 1.6rem);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-close__text-p {
  margin: 0 0 1.3rem;
  max-width: 42ch;
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(244, 239, 228, 0.82);
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.page-about .about-close__media {
  min-height: 200px;
  background: var(--deep);
}

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

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .about-reasons {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-panel {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.4rem 1.8rem;
  }
}

@media (min-width: 820px) {
  .page-about .about-desks {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .about-desk--a {
    grid-column: 1 / span 3;
  }

  .page-about .about-desk--b {
    grid-column: 4 / span 3;
    margin-top: 2.4rem;
  }

  .page-about .about-desk--c {
    grid-column: 2 / span 4;
    margin-top: 0.4rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-close {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: stretch;
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.4rem);
  }

  .page-about .about-margin {
    position: sticky;
    top: 6.5rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.15rem;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-margin__label {
    width: 100%;
    padding: 0 0 0.6rem;
    margin-bottom: 0.45rem;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .page-about .about-margin__link {
    width: 100%;
    border-radius: 10px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-panel {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-desk,
  .page-about .about-reason,
  .page-about .about-step::before,
  .page-about .about-margin__link,
  .page-about .about-side__link {
    transition-duration: 0.001ms;
  }

  .page-about .about-desk:hover,
  .page-about .about-desk:focus-within {
    transform: none;
  }
}