.page-about {
  background: var(--dusk);
  color: var(--chalk);
  font-family: var(--font-body);
  padding-bottom: var(--gap-block);
  overflow-x: hidden;
}

.page-about .breadcrumbs {
  padding-top: 24px;
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--grass);
}

.page-about .breadcrumbs a {
  color: var(--muted);
  text-decoration: none;
  min-height: 24px;
  display: inline-block;
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--lime);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: 20px;
}

.page-about .about-hero-frame {
  position: relative;
  border: 2px solid var(--grass);
  background: linear-gradient(175deg, rgba(11, 31, 25, 0.95), rgba(6, 17, 14, 0.98));
  box-shadow: var(--hard-shadow);
  padding: 20px 18px 26px;
}

.page-about .about-hero-tick {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-about .about-hero-tick::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--grass);
}

.page-about .eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(30px, 7vw, 54px);
  line-height: 1.2;
  letter-spacing: 0.01em;
}

.page-about .about-lede {
  margin: 0 0 22px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--chalk);
}

.page-about .about-hero-actions {
  gap: 10px;
  margin-bottom: 26px;
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--grass);
  border: 1px solid var(--grass);
}

.page-about .about-figures > div {
  background: var(--dusk);
  padding: 12px 14px;
}

.page-about .about-figures dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-figures dd {
  margin: 4px 0 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
  font-family: var(--font-num);
  font-size: 30px;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-unit {
  font-family: var(--font-body);
  font-size: 12px;
  color: var(--muted);
}

.page-about .media-frame {
  position: relative;
  margin: 0;
  background: var(--pitch);
  border: 2px solid var(--grass);
  overflow: hidden;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.75) contrast(1.05);
}

.page-about .media-frame-caption {
  display: block;
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--muted);
  border-top: 2px solid var(--grass);
  background: rgba(6, 17, 14, 0.9);
}

.page-about .about-hero-media {
  margin-top: 22px;
  border-color: var(--lime);
  box-shadow: var(--hard-shadow);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  margin-top: var(--gap-block);
}

.page-about .about-sec-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding-left: 14px;
  border-left: 2px solid var(--grass);
  margin-bottom: 24px;
}

.page-about .about-sec-num {
  font-family: var(--font-num);
  font-size: 34px;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--lime);
  letter-spacing: 0.02em;
}

.page-about .display-title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(23px, 5vw, 38px);
  line-height: 1.28;
  color: var(--chalk);
}

.page-about .about-sec-lede {
  margin: 0 0 26px;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 时间线 ---------- */
.page-about .about-tl-media {
  margin-bottom: 30px;
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 32px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--lime), var(--grass));
}

.page-about .about-timeline > li {
  position: relative;
  margin-bottom: 14px;
}

.page-about .about-timeline > li::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 20px;
  width: 16px;
  height: 16px;
  box-sizing: border-box;
  border: 2px solid var(--lime);
  background: var(--dusk);
}

.page-about .about-node {
  background: var(--pitch);
  border: 2px solid var(--grass);
}

.page-about .about-node summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  min-height: 44px;
  padding: 13px 14px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-node summary:hover {
  background: var(--grass);
}

.page-about .about-node summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

.page-about .about-node-year {
  font-family: var(--font-num);
  font-size: 20px;
  color: var(--gold);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.page-about .about-node-title {
  flex: 1;
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.5;
  color: var(--chalk);
}

.page-about .about-node summary::after {
  content: "+";
  font-family: var(--font-num);
  font-size: 20px;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-node[open] summary::after {
  content: "−";
}

.page-about .about-node p {
  margin: 0;
  padding: 0 14px 16px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 全宽色带 ---------- */
.page-about .about-band {
  margin: var(--gap-block) 0;
  padding: 40px 0 44px;
  background:
    repeating-linear-gradient(90deg, rgba(200, 255, 61, 0.07) 0 1px, transparent 1px 48px),
    linear-gradient(120deg, var(--grass), var(--pitch) 55%, var(--dusk));
  border-top: 2px solid var(--lime);
  border-bottom: 2px solid var(--lime);
}

.page-about .about-band-inner {
  display: grid;
  gap: 14px;
}

.page-about .about-quote {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(25px, 6.4vw, 50px);
  line-height: 1.24;
  color: var(--chalk);
}

.page-about .about-band-note {
  margin: 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--chalk);
  opacity: 0.85;
}

/* ---------- 四组流程 ---------- */
.page-about .about-flow {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(200px, 82%);
  gap: 12px;
  margin: 0;
  padding: 4px 4px 14px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-step {
  scroll-snap-align: start;
  padding: 16px;
  background: var(--pitch);
  border: 2px solid var(--grass);
  border-top: 4px solid var(--cyan);
  box-shadow: 4px 4px 0 rgba(58, 42, 8, 0.5);
}

.page-about .about-step-num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-num);
  font-size: 26px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-step h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  letter-spacing: 0.04em;
  color: var(--chalk);
}

.page-about .about-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-flow-note {
  margin: 8px 0 0;
  color: var(--muted);
}

/* ---------- 说明牌 ---------- */
.page-about .about-sec--labels {
  display: grid;
  gap: 26px;
}

.page-about .about-labels-intro {
  display: grid;
  gap: 10px;
  padding-left: 14px;
  border-left: 2px solid var(--grass);
}

.page-about .about-labels-note {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-labels {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-label {
  padding: 18px 16px;
  background: linear-gradient(180deg, var(--pitch), rgba(6, 17, 14, 0.95));
  border: 2px solid var(--grass);
  border-left: 6px solid var(--lime);
}

.page-about .about-label .tag {
  display: inline-block;
  margin-bottom: 10px;
}

.page-about .about-label h3 {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.45;
  color: var(--chalk);
}

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

/* ---------- 视觉体系 ---------- */
.page-about .about-sec--visual {
  display: grid;
  gap: 26px;
}

.page-about .about-visual-text {
  display: grid;
  gap: 14px;
  padding-left: 14px;
  border-left: 2px solid var(--grass);
}

.page-about .about-visual-text p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--chalk);
}

.page-about .about-swatches {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-swatches li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.page-about .about-swatch {
  width: 22px;
  height: 12px;
  flex: 0 0 22px;
  border: 1px solid rgba(232, 242, 236, 0.25);
}

.page-about .about-swatch--lime { background: var(--lime); }
.page-about .about-swatch--gold { background: var(--gold); }
.page-about .about-swatch--coral { background: var(--coral); }
.page-about .about-swatch--cyan { background: var(--cyan); }

.page-about .about-visual-type {
  font-size: 14px !important;
  color: var(--muted) !important;
  border-top: 2px solid var(--grass);
  padding-top: 14px;
}

.page-about .about-visual-media {
  border-color: var(--lime);
}

/* ---------- 接下来 ---------- */
.page-about .about-next-grid {
  display: grid;
  gap: 22px;
}

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

.page-about .about-next-list li {
  padding: 14px 16px;
  background: var(--pitch);
  border: 2px solid var(--grass);
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-next-list strong {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-display);
  font-size: 16px;
  letter-spacing: 0.06em;
  color: var(--lime);
}

.page-about .about-next-cta {
  padding: 20px 18px;
  background: linear-gradient(160deg, var(--grass), var(--pitch));
  border: 2px solid var(--lime);
  box-shadow: var(--hard-shadow);
}

.page-about .about-next-lead {
  margin: 0 0 16px;
  font-family: var(--font-serif);
  font-size: 19px;
  line-height: 1.5;
  color: var(--chalk);
}

.page-about .about-next-actions {
  gap: 10px;
  margin-bottom: 16px;
}

.page-about .about-next-fine {
  margin: 0;
  color: var(--chalk);
  opacity: 0.75;
  line-height: 1.7;
}

.page-about .about-next-fine a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 860px) {
  .page-about .about-hero {
    display: grid;
    grid-template-columns: 1.02fr 0.98fr;
    gap: 34px;
    align-items: end;
  }

  .page-about .about-hero-frame {
    padding: 26px 26px 30px;
  }

  .page-about .about-hero-media {
    margin-top: 0;
    margin-right: calc(-1 * var(--edge));
    margin-bottom: 6px;
  }

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

  .page-about .about-sec-head {
    gap: 20px;
    margin-bottom: 30px;
  }

  .page-about .about-sec-num {
    font-size: 52px;
  }

  .page-about .about-tl-media {
    margin-bottom: 36px;
  }

  .page-about .about-timeline {
    padding-left: 40px;
  }

  .page-about .about-timeline > li::before {
    left: -40px;
    top: 22px;
  }

  .page-about .about-node summary {
    padding: 16px 20px;
  }

  .page-about .about-node p {
    padding: 0 20px 18px 20px;
    max-width: 46em;
  }

  .page-about .about-flow {
    grid-auto-flow: row;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
    padding: 0;
    overflow: visible;
  }

  .page-about .about-step:nth-child(2) { margin-top: 26px; }
  .page-about .about-step:nth-child(3) { margin-top: 52px; }
  .page-about .about-step:nth-child(4) { margin-top: 78px; }

  .page-about .about-flow-note {
    display: none;
  }

  .page-about .about-sec--labels {
    grid-template-columns: 0.85fr 1.15fr;
    gap: 34px;
    align-items: start;
  }

  .page-about .about-labels-intro {
    position: sticky;
    top: 24px;
  }

  .page-about .about-label {
    padding: 22px 22px;
  }

  .page-about .about-sec--visual {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 36px;
    align-items: center;
  }

  .page-about .about-visual-media {
    margin-left: calc(-1 * var(--edge));
    border-left: 0;
  }

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

  .page-about .about-next-grid {
    grid-template-columns: 1.25fr 0.75fr;
    gap: 28px;
    align-items: start;
  }
}

@media (min-width: 1180px) {
  .page-about .about-band {
    padding: 56px 0 60px;
  }

  .page-about .about-band-inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.72fr);
    align-items: end;
    gap: 40px;
  }

  .page-about .about-band-inner .eyebrow {
    grid-column: 1 / -1;
  }

  .page-about .about-quote {
    font-size: 52px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    scroll-behavior: auto !important;
    animation: none !important;
    transition: none !important;
  }
}