.page-about {
  background: var(--c-grass);
  color: var(--c-bone);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background:
    radial-gradient(115% 85% at 82% -10%, rgba(27, 94, 68, 0.9) 0%, rgba(11, 61, 46, 0) 58%),
    linear-gradient(165deg, var(--c-ink) 0%, var(--c-grass) 68%, #0d4634 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 -1px 0;
  height: 22vw;
  max-height: 160px;
  background: linear-gradient(180deg, rgba(11, 61, 46, 0), rgba(11, 61, 46, 0.6));
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(2rem, 6vw, 3.5rem);
  padding-block: clamp(1.5rem, 4vw, 2.5rem) clamp(3rem, 8vw, 5.5rem);
}

.page-about .about-hero__copy .breadcrumb {
  margin-bottom: 1.25rem;
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2rem, 6.4vw, 4.2rem);
  line-height: 1.02;
  letter-spacing: -0.01em;
  margin: 0.6rem 0 1.1rem;
  max-width: 20ch;
}

.page-about .about-hero__lede {
  font-size: clamp(1rem, 1.9vw, 1.15rem);
  line-height: 1.8;
  color: var(--text-soft);
  max-width: 46ch;
  margin: 0;
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(1.2rem, 4vw, 2.6rem);
  margin-top: clamp(1.8rem, 4vw, 2.6rem);
  padding-top: clamp(1.4rem, 3vw, 2rem);
  border-top: 1px solid var(--line);
}

.page-about .hero-stat {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-width: 5.5rem;
}

.page-about .hero-stat__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.6rem, 4vw, 2.3rem);
  line-height: 1;
  color: var(--c-lime);
}

.page-about .hero-stat__plus {
  color: var(--c-orange);
  font-size: 0.7em;
  margin-left: 0.1em;
}

.page-about .hero-stat__label {
  font-size: 0.8rem;
  color: var(--c-slate);
  line-height: 1.5;
}

/* 纯 CSS 战术板 */
.page-about .about-hero__visual {
  position: relative;
  min-width: 0;
}

.page-about .about-pitch {
  position: relative;
  aspect-ratio: 4 / 3;
  width: 100%;
  max-width: 520px;
  margin-inline: auto;
  border: 1px solid var(--line-lime);
  border-radius: 3px;
  background:
    linear-gradient(180deg, rgba(7, 30, 23, 0.7), rgba(11, 61, 46, 0.35)),
    repeating-linear-gradient(0deg, rgba(198, 255, 61, 0.045) 0 2px, transparent 2px 12px);
  overflow: hidden;
  box-shadow: 0 30px 80px -40px rgba(0, 0, 0, 0.9);
}

.page-about .about-pitch__stripe {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 50%;
  background: linear-gradient(180deg, rgba(27, 94, 68, 0.4), rgba(7, 30, 23, 0.4));
}

.page-about .about-pitch__stripe--a { left: 0; }
.page-about .about-pitch__stripe--b { right: 0; background: rgba(7, 30, 23, 0.28); }

.page-about .about-pitch__half {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  background: var(--c-lime);
  opacity: 0.55;
}

.page-about .about-pitch__circle {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 26%;
  aspect-ratio: 1;
  border: 1px solid var(--c-lime);
  border-radius: 50%;
  opacity: 0.5;
}

.page-about .about-pitch__box {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 15%;
  height: 46%;
  border: 1px solid rgba(198, 255, 61, 0.45);
}

.page-about .about-pitch__box--left { left: 0; border-left: 0; }
.page-about .about-pitch__box--right { right: 0; border-right: 0; }

.page-about .about-pitch__spot {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-orange);
  box-shadow: 0 0 0 6px rgba(255, 122, 26, 0.18);
}

.page-about .about-pitch__node {
  position: absolute;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-lime);
  box-shadow: 0 0 0 5px rgba(198, 255, 61, 0.16);
}

.page-about .about-pitch__node--1 { top: 26%; left: 21%; }
.page-about .about-pitch__node--2 { top: 68%; left: 34%; }
.page-about .about-pitch__node--3 { top: 40%; left: 74%; background: var(--c-orange); box-shadow: 0 0 0 5px rgba(255, 122, 26, 0.18); }

.page-about .about-pitch__scan {
  position: absolute;
  left: -20%;
  right: -20%;
  top: 0;
  height: 42%;
  background: linear-gradient(180deg, rgba(198, 255, 61, 0) 0%, rgba(198, 255, 61, 0.1) 70%, rgba(198, 255, 61, 0) 100%);
  animation: about-scan 7s var(--ease) infinite;
}

@keyframes about-scan {
  0%   { transform: translateY(-110%); }
  60%  { transform: translateY(180%); }
  100% { transform: translateY(180%); }
}

/* ---------- 目录索引 + 内容流 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(2rem, 5vw, 4rem);
  padding-block: clamp(2.5rem, 7vw, 5rem) clamp(3rem, 8vw, 6rem);
}

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

.page-about .about-index__title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-slate);
  margin: 0 0 0.9rem;
}

.page-about .about-index__list {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.6rem;
  margin: 0;
  list-style: none;
  scrollbar-width: thin;
}

.page-about .about-index__list li { flex: 0 0 auto; }

.page-about .about-index__list a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text-soft);
  font-size: 0.86rem;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--d-fast) var(--ease), border-color var(--d-fast) var(--ease), background-color var(--d-fast) var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--c-ink);
  background: var(--c-lime);
  border-color: var(--c-lime);
}

.page-about .about-index__tick {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--c-lime);
  flex: 0 0 auto;
}

.page-about .about-flow {
  min-width: 0;
  display: flex;
  flex-direction: column;
}

/* ---------- 通用内容块 ---------- */
.page-about .about-block {
  position: relative;
  padding-block: clamp(2.4rem, 6vw, 4.4rem);
  scroll-margin-top: calc(var(--header-h) + 1.5rem);
  border-top: 1px solid var(--line);
}

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

.page-about .about-block__head {
  display: flex;
  align-items: baseline;
  gap: clamp(0.7rem, 2vw, 1.4rem);
  margin-bottom: clamp(1.1rem, 3vw, 1.7rem);
}

.page-about .about-block__num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--c-lime);
  letter-spacing: 0.08em;
  margin: 0;
  flex: 0 0 auto;
}

.page-about .about-block h2 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.5rem, 4.2vw, 2.4rem);
  line-height: 1.1;
  letter-spacing: -0.005em;
  margin: 0;
  max-width: 26ch;
  color: var(--c-bone);
}

.page-about .about-block__body {
  max-width: 62ch;
}

.page-about .about-block__body p {
  font-size: clamp(0.98rem, 1.7vw, 1.06rem);
  line-height: 1.85;
  color: var(--text-soft);
  margin: 0 0 1.05rem;
}

.page-about .about-block__body p:last-child { margin-bottom: 0; }

.page-about .about-block__body a {
  color: var(--c-lime);
  text-decoration: none;
  border-bottom: 1px solid var(--line-lime);
}

.page-about .about-block__body a:hover { border-bottom-color: var(--c-lime); }

/* 错位：偶数块向右推开 */
.page-about .about-block--b .about-block__head,
.page-about .about-block--b .about-block__body,
.page-about .about-block--d .about-block__head,
.page-about .about-block--d .about-block__body {
  margin-left: auto;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(1.8rem, 4.5vw, 2.8rem) 0 0;
  position: relative;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  filter: saturate(0.92) contrast(1.04);
}

.page-about .about-figure figcaption {
  margin-top: 0.75rem;
  font-size: 0.83rem;
  line-height: 1.65;
  color: var(--c-slate);
  max-width: 56ch;
}

.page-about .about-figure--wide img { aspect-ratio: 16 / 9; }
.page-about .about-figure--split img { aspect-ratio: 14 / 9; }

.page-about .about-figure--split {
  position: relative;
}

.page-about .about-figure--split::before {
  content: "";
  position: absolute;
  left: -1px;
  top: clamp(1.2rem, 3vw, 2rem);
  bottom: clamp(2.6rem, 5vw, 3.6rem);
  width: 3px;
  background: linear-gradient(180deg, var(--c-lime) 0%, var(--c-orange) 100%);
}

/* ---------- 覆盖数字网格 ---------- */
.page-about .coverage-grid {
  list-style: none;
  margin: clamp(1.8rem, 4.5vw, 2.6rem) 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .coverage-cell {
  background: var(--c-grass);
  padding: clamp(1.1rem, 3vw, 1.6rem) clamp(0.95rem, 2.4vw, 1.3rem);
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  min-width: 0;
}

.page-about .coverage-cell__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.4rem, 3.6vw, 2rem);
  line-height: 1;
  color: var(--c-bone);
}

.page-about .coverage-cell__label {
  font-size: 0.83rem;
  line-height: 1.6;
  color: var(--c-slate);
}

.page-about .coverage-cell--lime { background: rgba(198, 255, 61, 0.09); }
.page-about .coverage-cell--lime .coverage-cell__num { color: var(--c-lime); }

.page-about .coverage-cell--clay { background: rgba(185, 133, 107, 0.16); }
.page-about .coverage-cell--clay .coverage-cell__num { color: var(--c-clay); }

.page-about .coverage-cell--moss { background: var(--c-moss); }
.page-about .coverage-cell--moss .coverage-cell__label { color: rgba(243, 241, 231, 0.82); }

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(0.9rem, 2.4vw, 1.3rem);
  margin-top: clamp(1.6rem, 4vw, 2.4rem);
}

.page-about .team-card {
  position: relative;
  padding: clamp(1.3rem, 3.2vw, 2rem);
  background: linear-gradient(150deg, rgba(27, 94, 68, 0.5) 0%, rgba(7, 30, 23, 0.35) 100%);
  border-left: 3px solid var(--c-moss);
  border-radius: var(--radius);
  transition: border-color var(--d-mid) var(--ease), transform var(--d-mid) var(--ease), background-color var(--d-mid) var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-visible {
  border-left-color: var(--c-lime);
  transform: translateX(8px);
  outline: none;
}

.page-about .team-card:focus-visible {
  box-shadow: 0 0 0 2px var(--c-lime);
}

.page-about .team-card__count {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.8rem, 5vw, 2.6rem);
  line-height: 1;
  color: var(--c-lime);
  margin: 0 0 0.5rem;
}

.page-about .team-card__role {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.02rem, 2.4vw, 1.2rem);
  line-height: 1.3;
  margin: 0 0 0.6rem;
  color: var(--c-bone);
}

.page-about .team-card__duty {
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--text-soft);
  margin: 0;
  opacity: 0.78;
  transition: opacity var(--d-mid) var(--ease);
}

.page-about .team-card:hover .team-card__duty,
.page-about .team-card:focus-visible .team-card__duty { opacity: 1; }

.page-about .about-note {
  display: flex;
  align-items: flex-start;
  gap: 0.9rem;
  margin-top: clamp(1.4rem, 3.5vw, 2rem);
  padding: clamp(1rem, 2.6vw, 1.4rem) clamp(1.1rem, 2.8vw, 1.6rem);
  background: rgba(198, 255, 61, 0.07);
  border: 1px solid var(--line-lime);
  border-radius: var(--radius);
}

.page-about .about-note__mark {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--c-lime);
  margin: 0;
  flex: 0 0 auto;
  line-height: 1.7;
}

.page-about .about-note p:last-child {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.75;
  color: var(--text-soft);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline-wrap {
  margin-top: clamp(1.6rem, 4vw, 2.4rem);
  overflow-x: auto;
  overflow-y: hidden;
  padding-bottom: 0.8rem;
  scrollbar-width: thin;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(230px, 1fr);
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  min-width: 100%;
  width: max-content;
}

.page-about .tl-node {
  position: relative;
  background: var(--c-grass);
  padding: clamp(1.3rem, 3vw, 1.9rem) clamp(1.05rem, 2.6vw, 1.5rem) clamp(1.5rem, 3.4vw, 2.1rem);
  min-width: 0;
  border-top: 3px solid var(--c-stone);
  transition: background-color var(--d-mid) var(--ease), border-color var(--d-mid) var(--ease);
}

.page-about .tl-node:hover,
.page-about .tl-node:focus-within {
  background: rgba(27, 94, 68, 0.65);
  border-top-color: var(--c-lime);
}

.page-about .tl-node--orange { border-top-color: var(--c-orange); }
.page-about .tl-node--lime { border-top-color: var(--c-lime); background: rgba(27, 94, 68, 0.45); }

.page-about .tl-year {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  color: var(--c-lime);
  margin-bottom: 0.7rem;
}

.page-about .tl-node--orange .tl-year { color: var(--c-orange); }

.page-about .tl-title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1rem, 2.3vw, 1.15rem);
  line-height: 1.35;
  margin: 0 0 0.6rem;
  color: var(--c-bone);
}

.page-about .tl-body {
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--text-soft);
  margin: 0;
  max-width: 34ch;
}

/* ---------- 服务对象 ---------- */
.page-about .audience-list {
  list-style: none;
  margin: clamp(1.6rem, 4vw, 2.4rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .audience-item {
  background: linear-gradient(100deg, rgba(7, 30, 23, 0.55) 0%, rgba(11, 61, 46, 0.3) 100%);
  padding: clamp(1.2rem, 3vw, 1.8rem) clamp(1.1rem, 2.8vw, 1.7rem);
  display: grid;
  gap: 0.55rem;
}

.page-about .audience-item__title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1rem, 2.3vw, 1.16rem);
  line-height: 1.35;
  margin: 0;
  color: var(--c-lime-soft);
  position: relative;
  padding-left: 1.1rem;
}

.page-about .audience-item__title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.52em;
  width: 0.42rem;
  height: 0.42rem;
  background: var(--c-orange);
  border-radius: 50%;
}

.page-about .audience-item__desc {
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--text-soft);
  margin: 0;
  max-width: 62ch;
}

/* ---------- 开始协作 ---------- */
.page-about .start-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(0.9rem, 2.4vw, 1.3rem);
  margin-top: clamp(1.6rem, 4vw, 2.4rem);
}

.page-about .start-card {
  padding: clamp(1.25rem, 3vw, 1.8rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(7, 30, 23, 0.4);
}

.page-about .start-card--accent {
  border-color: var(--line-lime);
  background: linear-gradient(150deg, rgba(198, 255, 61, 0.1) 0%, rgba(7, 30, 23, 0.5) 100%);
}

.page-about .start-card__title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1rem, 2.4vw, 1.15rem);
  line-height: 1.3;
  margin: 0 0 0.6rem;
  color: var(--c-bone);
}

.page-about .start-card--accent .start-card__title { color: var(--c-lime); }

.page-about .start-card__desc {
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--text-soft);
  margin: 0;
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: clamp(1.6rem, 4vw, 2.2rem);
}

.page-about .about-next {
  margin-top: clamp(2rem, 5vw, 3rem);
  padding-top: clamp(1.4rem, 3.5vw, 2rem);
  border-top: 1px solid var(--line);
}

.page-about .about-next__title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-slate);
  margin: 0 0 0.9rem;
}

.page-about .about-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.page-about .about-next__list a {
  display: inline-block;
  color: var(--c-bone);
  text-decoration: none;
  font-size: 0.95rem;
  line-height: 1.6;
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.15rem;
  transition: color var(--d-fast) var(--ease), border-color var(--d-fast) var(--ease);
}

.page-about .about-next__list a:hover,
.page-about .about-next__list a:focus-visible {
  color: var(--c-lime);
  border-bottom-color: var(--c-lime);
}

.page-about .about-backtop {
  margin: clamp(1.8rem, 4vw, 2.4rem) 0 0;
}

.page-about .about-backtop a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-slate);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.2rem;
  transition: color var(--d-fast) var(--ease);
}

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

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .coverage-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .team-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .start-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .audience-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
  }
  .page-about .about-pitch { margin-inline: 0 auto; }
}

@media (min-width: 1040px) {
  .page-about .about-layout {
    grid-template-columns: 190px minmax(0, 1fr);
    align-items: start;
    gap: clamp(2.5rem, 5vw, 5rem);
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 2rem);
    align-self: start;
  }

  .page-about .about-index__list {
    flex-direction: column;
    overflow-x: visible;
    gap: 0.15rem;
    padding-bottom: 0;
  }

  .page-about .about-index__list a {
    padding: 0.5rem 0 0.5rem 0.85rem;
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0;
    white-space: normal;
    width: 100%;
  }

  .page-about .about-index__list a:hover,
  .page-about .about-index__list a:focus-visible {
    background: transparent;
    color: var(--c-lime);
    border-left-color: var(--c-lime);
  }

  /* 错位：给右移的块留出左侧空白 */
  .page-about .about-block--b .about-block__head,
  .page-about .about-block--b .about-block__body,
  .page-about .about-block--d .about-block__head,
  .page-about .about-block--d .about-block__body {
    max-width: 60%;
  }

  .page-about .coverage-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 1280px) {
  .page-about .coverage-grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .page-about .audience-list { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-pitch__scan { animation: none; opacity: 0.35; }
  .page-about .team-card,
  .page-about .about-index__list a,
  .page-about .tl-node { transition: none; }
  .page-about .team-card:hover,
  .page-about .team-card:focus-visible { transform: none; }
}
</br>