.page-about {
  --about-rail: 220px;
  background: var(--paper);
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--forest);
  color: var(--paper);
  padding: clamp(40px, 6vw, 78px) 0 clamp(48px, 6.5vw, 82px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -28%;
  right: -16%;
  width: min(720px, 78%);
  aspect-ratio: 1 / 1;
  background: linear-gradient(145deg, rgba(216, 178, 106, 0.22), rgba(53, 224, 196, 0.07) 54%, transparent 72%);
  transform: rotate(22deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, var(--gold-55), var(--cyan-35) 55%, transparent);
}

.page-about .about-hero .breadcrumbs {
  position: relative;
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(22px, 4vw, 42px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--paper-52);
}

.page-about .about-hero .breadcrumbs a {
  color: var(--paper-72);
  text-decoration: none;
}

.page-about .about-hero .breadcrumbs a:hover {
  color: var(--gold);
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  gap: clamp(34px, 5vw, 54px);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(31px, 5.4vw, 58px);
  line-height: 1.16;
  letter-spacing: -0.012em;
}

.page-about .about-hero-lede {
  margin: 20px 0 0;
  max-width: 36em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.9;
  color: var(--paper-72);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero-figure {
  position: relative;
  margin: 0;
  padding: 10px;
  border: 1px solid var(--gold-35);
  border-radius: var(--radius);
  background: rgba(7, 23, 18, 0.42);
  box-shadow: 0 26px 48px -36px rgba(0, 0, 0, 0.9);
}

.page-about .about-hero-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 2px;
  object-fit: cover;
}

.page-about .about-hero-figure figcaption {
  position: absolute;
  left: 20px;
  bottom: -12px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--forest);
  background: var(--gold);
  border-radius: 2px;
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 56px);
  padding: clamp(38px, 6vw, 74px) 0 clamp(54px, 8vw, 92px);
}

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

/* ---------- 章节轨道 ---------- */
.page-about .about-rail {
  min-width: 0;
  border-top: 1px solid var(--ink-14);
  padding-top: 14px;
}

.page-about .rail-title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-45);
}

.page-about .rail-list {
  display: flex;
  gap: 8px;
  margin: 12px 0 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .rail-list::-webkit-scrollbar {
  display: none;
}

.page-about .rail-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 13px;
  white-space: nowrap;
  font-size: 13px;
  color: var(--ink-72);
  text-decoration: none;
  background: var(--paper-92);
  border: 1px solid var(--ink-14);
  border-radius: 999px;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--ink);
  border-color: var(--gold-55);
}

.page-about .rail-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--gold-deep);
}

.page-about .rail-scale {
  display: none;
}

/* ---------- 正文区块 ---------- */
.page-about .about-section {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-section + .about-section {
  margin-top: clamp(38px, 5.5vw, 66px);
  padding-top: clamp(28px, 4vw, 44px);
  border-top: 1px solid var(--ink-08);
}

.page-about .about-section h2 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.4vw, 35px);
  line-height: 1.28;
  letter-spacing: -0.008em;
}

.page-about .about-text {
  max-width: 68ch;
  margin-top: 18px;
}

.page-about .about-text p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--ink-72);
}

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

.page-about .about-text a {
  color: var(--gold-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--gold-55);
}

.page-about .about-text a:hover {
  color: var(--ink);
  border-bottom-color: var(--cyan);
}

/* ---------- 维护机制名册 ---------- */
.page-about .about-roster {
  display: grid;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-roster li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 0;
  border-top: 1px solid var(--ink-14);
}

.page-about .about-roster li:last-child {
  border-bottom: 1px solid var(--ink-14);
}

.page-about .roster-num {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--gold-deep);
}

.page-about .about-roster h3 {
  margin: 0 0 6px;
  font-size: 16.5px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-about .about-roster p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--ink-72);
}

/* ---------- 图像 ---------- */
.page-about .about-figure {
  margin: 28px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--gold-35);
  border-radius: var(--radius);
  background: var(--forest);
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--ink-45);
}

/* ---------- 年度节奏 ---------- */
.page-about .cadence-layout {
  display: grid;
  gap: 30px;
  margin-top: 22px;
}

.page-about .cadence-layout .about-text {
  margin-top: 0;
}

.page-about .cadence-figure {
  position: relative;
  margin: 0;
  padding: 0 10px 10px 0;
}

.page-about .cadence-figure::before {
  content: "";
  position: absolute;
  inset: 12px 0 0 12px;
  border: 1px solid var(--gold-35);
  border-radius: var(--radius);
  background: var(--mist);
}

.page-about .cadence-figure img {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--gold-35);
  border-radius: var(--radius);
  object-fit: cover;
}

/* ---------- 结果 ---------- */
.page-about .outcome-grid {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.page-about .outcome-card {
  position: relative;
  padding: 22px 22px 22px 26px;
  background: var(--paper-92);
  border: 1px solid var(--gold-35);
  border-radius: var(--radius);
  box-shadow: var(--shadow-paper);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.page-about .outcome-card::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 26px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .outcome-card:hover {
  transform: translateY(-3px);
  border-color: var(--gold-55);
  box-shadow: var(--shadow-lift);
}

.page-about .outcome-card h3 {
  margin: 0 0 8px;
  font-size: 16.5px;
  font-weight: 700;
}

.page-about .outcome-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-72);
}

.page-about .outcome-card a {
  color: var(--gold-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--gold-55);
}

/* ---------- 时间线 ---------- */
.page-about .timeline-scroll {
  margin-top: 26px;
  overflow-x: auto;
  padding-bottom: 10px;
  scroll-snap-type: x proximity;
}

.page-about .timeline {
  display: flex;
  margin: 0;
  padding: 0;
  list-style: none;
  min-width: 740px;
}

.page-about .timeline-item {
  position: relative;
  flex: 1 1 0;
  min-width: 142px;
  padding: 0 20px 0 0;
  scroll-snap-align: start;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  top: 31px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--ink-14);
}

.page-about .timeline-item::after {
  content: "";
  position: absolute;
  top: 27px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--paper);
  border: 1px solid var(--gold-deep);
}

.page-about .timeline-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--gold-deep);
}

.page-about .timeline-item p {
  margin: 24px 0 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--ink-72);
}

.page-about .timeline-item--now::after {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px var(--cyan-12);
}

.page-about .timeline-item--now .timeline-year {
  color: var(--ink);
}

/* ---------- 协作与联络 ---------- */
.page-about .about-contact-panel {
  margin-top: 24px;
  padding: clamp(22px, 3.4vw, 34px);
  background: var(--forest);
  color: var(--paper);
  border: 1px solid var(--moss);
  border-radius: var(--radius);
}

.page-about .about-contact-panel > p {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--paper-72);
}

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

.page-about .about-contact-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
  padding: 12px 0;
  border-top: 1px solid var(--paper-38);
}

.page-about .ac-label {
  min-width: 74px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--sage);
}

.page-about .ac-value {
  font-size: 14.5px;
  letter-spacing: 0.01em;
  color: var(--paper);
  word-break: break-word;
}

.page-about .about-contact-panel .btn {
  margin-top: 22px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-contact-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 26px;
  }
}

@media (min-width: 720px) {
  .page-about .outcome-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: end;
  }

  .page-about .cadence-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
    align-items: start;
    gap: 34px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    border-top: 0;
    padding-top: 0;
  }

  .page-about .rail-list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
    margin-top: 14px;
  }

  .page-about .rail-link {
    padding: 9px 0 9px 14px;
    border: 0;
    border-left: 1px solid var(--ink-14);
    border-radius: 0;
    background: transparent;
    font-size: 14px;
  }

  .page-about .rail-link:hover,
  .page-about .rail-link:focus-visible {
    border-left-color: var(--cyan);
  }

  .page-about .rail-scale {
    display: grid;
    gap: 16px;
    margin-top: 30px;
    padding-left: 14px;
    border-left: 1px solid var(--ink-08);
  }

  .page-about .rail-scale-item {
    position: relative;
    font-family: var(--font-mono);
    font-size: 11.5px;
    letter-spacing: 0.08em;
    color: var(--ink-45);
  }

  .page-about .rail-scale-item::before {
    content: "";
    position: absolute;
    left: -15px;
    top: 7px;
    width: 8px;
    height: 1px;
    background: var(--gold-55);
  }

  .page-about .rail-scale-item--now {
    color: var(--gold-deep);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .outcome-card {
    transition: none;
  }

  .page-about .outcome-card:hover {
    transform: none;
  }

  .page-about .rail-link {
    transition: none;
  }
}