.page-about {
  --about-max: 1120px;
  --about-narrow: 660px;
  background: var(--green-ink);
  color: var(--text);
  font-family: var(--font-body);
  padding-bottom: clamp(56px, 8vw, 96px);
  overflow-x: hidden;
}

.page-about .mono {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

/* 面包屑 */
.page-about .about-bar {
  max-width: var(--about-max);
  margin: 0 auto;
  padding: 16px var(--gutter) 0;
}
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--text-dim);
}
.page-about .breadcrumb a {
  color: var(--text-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}
.page-about .breadcrumb-sep {
  color: var(--line);
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--text);
}

/* 首屏 */
.page-about .about-hero-media {
  position: relative;
  max-width: var(--about-max);
  margin: 16px auto 0;
  padding: 0 var(--gutter);
}
.page-about .about-hero-media img {
  display: block;
  width: 100%;
  height: clamp(190px, 32vw, 400px);
  object-fit: cover;
  border: 1px solid var(--line);
  filter: saturate(0.78) contrast(1.04);
}
.page-about .about-hero-media::after {
  content: "";
  position: absolute;
  left: var(--gutter);
  right: var(--gutter);
  top: 0;
  bottom: 0;
  background: linear-gradient(180deg, rgba(6, 35, 28, 0) 38%, rgba(6, 35, 28, 0.94) 100%);
  pointer-events: none;
}
.page-about .about-hero-media figcaption {
  position: absolute;
  left: calc(var(--gutter) + 14px);
  right: calc(var(--gutter) + 14px);
  bottom: 12px;
  z-index: 1;
  font-size: 12px;
  color: var(--text-dim);
}

.page-about .about-hero-copy {
  max-width: var(--about-max);
  margin: 0 auto;
  padding: 22px var(--gutter) 0;
}
.page-about .about-kicker {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--lime);
}
.page-about .about-hero-copy h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 6.4vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  transform: skewX(-3deg);
  transform-origin: left bottom;
}
.page-about .about-lead {
  max-width: 46ch;
  margin: 20px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text);
  opacity: 0.9;
}
.page-about .about-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 30px;
  margin: 30px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--text-dim);
}
.page-about .about-facts b {
  margin-right: 6px;
  font-size: 19px;
  font-weight: 600;
  color: var(--lime);
}

/* 章节索引 */
.page-about .about-index {
  max-width: var(--about-max);
  margin: clamp(30px, 5vw, 56px) auto 0;
  padding: 0 var(--gutter);
}
.page-about .about-index-inner {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 12px 0;
  list-style: none;
  overflow-x: auto;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  scrollbar-width: thin;
}
.page-about .about-index a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 10px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 13px;
  color: var(--text-dim);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.page-about .about-index a .mono {
  font-size: 11px;
  color: var(--lime);
}
.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--text);
  border-color: var(--line);
  background: rgba(18, 41, 58, 0.55);
}
.page-about .about-index a:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

/* 章节通用 */
.page-about .about-section {
  max-width: var(--about-max);
  margin: 0 auto;
  padding: clamp(44px, 7vw, 86px) var(--gutter) 0;
  scroll-margin-top: 24px;
}
.page-about .section-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 0 0 clamp(20px, 3vw, 32px);
  padding-top: 16px;
  border-top: 1px solid var(--line);
}
.page-about .section-index {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--lime);
}
.page-about .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(21px, 3.6vw, 32px);
  line-height: 1.24;
  letter-spacing: -0.01em;
}
.page-about .section-note {
  margin: 0;
  max-width: 38ch;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-prose {
  max-width: 34em;
}
.page-about .about-prose p {
  margin: 0 0 1.15em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text);
  opacity: 0.92;
}
.page-about .about-quote {
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 18px 0 18px 20px;
  max-width: 30em;
  border-left: 2px solid var(--lime);
  background: linear-gradient(90deg, rgba(14, 59, 51, 0.65), rgba(6, 35, 28, 0));
  font-family: var(--font-display);
  font-size: clamp(17px, 2.4vw, 21px);
  line-height: 1.6;
  color: var(--text);
}

/* 流程 */
.page-about .flow-rail {
  display: none;
}
.page-about .flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .flow-step {
  position: relative;
  padding: 18px 16px 18px 18px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--line);
  background: var(--panel-blue);
  transition: transform 0.22s var(--ease), border-color 0.22s var(--ease), background 0.22s var(--ease);
}
.page-about .flow-step:hover,
.page-about .flow-step:focus-within,
.page-about .flow-step:focus {
  transform: translateY(-2px);
  border-color: var(--lime);
  background: var(--night-blue);
  outline: none;
}
.page-about .flow-step:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
  box-shadow: 0 0 0 5px rgba(201, 242, 76, 0.16);
}
.page-about .flow-no {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 12px;
  color: var(--lime);
}
.page-about .flow-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.3;
}
.page-about .flow-text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-flow-media {
  margin: clamp(26px, 4vw, 40px) 0 0;
  width: 100%;
  max-width: 620px;
}
.page-about .about-flow-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--line);
  filter: saturate(0.8);
}
.page-about .about-flow-media figcaption {
  margin-top: 10px;
  font-size: 12px;
  color: var(--text-dim);
}

/* 团队比例条 */
.page-about .team-bars {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .team-bar {
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}
.page-about .team-bar-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}
.page-about .team-name {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.01em;
}
.page-about .team-count {
  font-size: 13px;
  color: var(--lime);
}
.page-about .team-track {
  position: relative;
  height: 6px;
  background: rgba(44, 74, 71, 0.5);
  overflow: hidden;
}
.page-about .team-track::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(6, 35, 28, 0.85) 0 1px, transparent 1px 20px);
  pointer-events: none;
}
.page-about .team-fill {
  display: block;
  height: 100%;
  background: var(--lime);
}
.page-about .team-fill--data { width: 33.3%; opacity: 1; }
.page-about .team-fill--schedule { width: 26.2%; opacity: 0.78; }
.page-about .team-fill--write { width: 23.8%; opacity: 0.58; }
.page-about .team-fill--ops { width: 16.7%; opacity: 0.4; }
.page-about .team-desc {
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* 三条内容线 */
.page-about .line-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.page-about .line-card {
  display: flex;
  flex-direction: column;
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--line);
  background: var(--panel-blue);
  transition: transform 0.22s var(--ease), border-color 0.22s var(--ease);
}
.page-about .line-card:hover {
  transform: translateY(-2px);
  border-color: var(--line);
}
.page-about .line-card--screen { border-top-color: var(--lime); }
.page-about .line-card--review { border-top-color: var(--orange); }
.page-about .line-card--compare {
  border-top-color: var(--text-dim);
  background: linear-gradient(160deg, var(--grad-teal), var(--panel-blue));
}
.page-about .line-tag {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--text-dim);
}
.page-about .line-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.3;
}
.page-about .line-text {
  margin: 0 0 20px;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--text-dim);
}
.page-about .line-link {
  margin-top: auto;
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 3px;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}
.page-about .line-link:hover,
.page-about .line-link:focus-visible {
  border-bottom-color: var(--lime);
}
.page-about .line-link:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

/* 覆盖与合作 */
.page-about .about-band {
  margin-top: clamp(44px, 7vw, 86px);
  padding: clamp(40px, 6vw, 72px) 0;
  background: linear-gradient(155deg, var(--grad-teal) 0%, var(--night-blue) 55%, var(--grad-blue) 100%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 24px;
}
.page-about .about-band-inner {
  max-width: var(--about-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.page-about .about-head--band {
  border-top-color: rgba(155, 176, 174, 0.28);
}
.page-about .reach-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.5vw, 40px);
}
.page-about .reach-media {
  margin: 0;
  max-width: 340px;
}
.page-about .reach-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 6;
  object-fit: cover;
  border: 1px solid var(--line);
  filter: saturate(0.72) brightness(0.95);
}
.page-about .reach-media figcaption {
  margin-top: 10px;
  font-size: 12px;
  color: var(--text-dim);
}
.page-about .reach-text {
  margin: 0 0 1.1em;
  max-width: 40em;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--text);
  opacity: 0.9;
}
.page-about .about-numbers {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .about-numbers li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 14px 16px;
  background: rgba(6, 35, 28, 0.86);
}
.page-about .num-value {
  font-size: clamp(24px, 4vw, 34px);
  font-weight: 500;
  line-height: 1;
  color: var(--lime);
}
.page-about .num-unit {
  font-size: 0.55em;
  margin-left: 2px;
}
.page-about .num-label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-dim);
}

/* 时间线 */
.page-about .about-timeline {
  margin: 0;
  padding: 0 0 0 24px;
  list-style: none;
  border-left: 1px solid var(--line);
}
.page-about .tl-item {
  position: relative;
  padding: 0 0 26px 4px;
  transition: transform 0.22s var(--ease);
}
.page-about .tl-item:last-child {
  padding-bottom: 0;
}
.page-about .tl-node {
  position: absolute;
  left: -28px;
  top: 6px;
  width: 8px;
  height: 8px;
  background: var(--line);
  transition: background 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.page-about .tl-item:hover .tl-node,
.page-about .tl-item:focus-within .tl-node,
.page-about .tl-item:focus .tl-node {
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(201, 242, 76, 0.18);
}
.page-about .tl-item:hover,
.page-about .tl-item:focus {
  transform: translateX(2px);
  outline: none;
}
.page-about .tl-item:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 4px;
}
.page-about .tl-stage {
  margin: 0 0 8px;
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--orange);
}
.page-about .tl-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.35;
}
.page-about .tl-text {
  margin: 0 0 8px;
  max-width: 40em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}
.page-about .tl-out {
  margin: 0;
  font-size: 12px;
  color: rgba(155, 176, 174, 0.78);
}

/* 收尾 */
.page-about .about-cta {
  max-width: var(--about-max);
  margin: clamp(44px, 7vw, 86px) auto 0;
  padding: clamp(28px, 4vw, 44px) var(--gutter) 0;
}
.page-about .about-cta-title {
  margin: 0 0 12px;
  max-width: 20em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 3.2vw, 28px);
  line-height: 1.3;
}
.page-about .about-cta-text {
  margin: 0 0 22px;
  max-width: 36em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}
.page-about .about-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .about-cta-links .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  border-radius: var(--radius);
  font-size: 14px;
  text-decoration: none;
}
.page-about .about-cta-links .btn:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

/* 平板与桌面 */
@media (min-width: 720px) {
  .page-about .section-head {
    grid-template-columns: 56px minmax(0, 1fr);
    column-gap: 16px;
    align-items: start;
  }
  .page-about .section-title {
    grid-column: 2;
  }
  .page-about .section-note {
    grid-column: 2;
  }
  .page-about .line-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .team-bars {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 32px;
  }
  .page-about .about-numbers {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-cta {
    padding-top: 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-copy h1 {
    max-width: 16em;
  }
  .page-about .flow-rail {
    display: block;
    margin: 0 0 -22px;
    color: var(--line);
  }
  .page-about .flow-rail svg {
    display: block;
    width: 100%;
    height: 26px;
  }
  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }
  .page-about .about-flow-media {
    margin-left: auto;
  }
  .page-about .reach-grid {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .reach-media {
    max-width: none;
  }
  .page-about .about-index {
    position: sticky;
    top: 0;
    z-index: 4;
    background: linear-gradient(180deg, var(--green-ink) 72%, rgba(6, 35, 28, 0.88));
  }
  .page-about .about-index-inner {
    flex-wrap: wrap;
    overflow-x: visible;
  }
}

@media (min-width: 1100px) {
  .page-about .section-head {
    grid-template-columns: 64px minmax(0, 1fr) 262px;
  }
  .page-about .section-note {
    grid-column: 3;
    margin-top: 4px;
  }
  .page-about .about-prose {
    padding-left: 80px;
  }
  .page-about .about-quote {
    margin-left: 80px;
  }
  .page-about .about-numbers li {
    padding: 16px 16px 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .flow-step,
  .page-about .line-card,
  .page-about .tl-item,
  .page-about .team-fill {
    transition: none;
  }
  .page-about .flow-step:hover,
  .page-about .line-card:hover,
  .page-about .tl-item:hover {
    transform: none;
  }
}