.page-about {
  --about-lift: #0F2A22;
  --about-accent: var(--lime);
  --about-pad: clamp(20px, 4vw, 44px);
  color: var(--bone);
  font-family: var(--font-sans);
  padding-bottom: clamp(64px, 9vw, 112px);
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: clamp(16px, 3vw, 30px);
  font-size: 13px;
  color: var(--graphite);
}
.page-about .crumbs a {
  color: var(--graphite);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}
.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}
.page-about .crumbs [aria-current="page"] {
  color: var(--bone);
}

/* ---------- 开场 ---------- */
.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4.5vw, 54px);
  margin-top: clamp(22px, 3.5vw, 38px);
}
.page-about .about-hero__title {
  margin: 10px 0 0;
  font-family: var(--font-cond);
  font-weight: 900;
  font-size: clamp(46px, 9vw, 78px);
  line-height: 0.94;
  letter-spacing: -0.02em;
  color: var(--bone);
}
.page-about .about-hero__sub {
  display: block;
  margin-top: 16px;
  font-family: var(--font-sans);
  font-size: clamp(15px, 1.9vw, 19px);
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: 0.01em;
  color: var(--lime);
}
.page-about .about-hero__lead {
  margin-top: 20px;
  max-width: 64ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.82;
  color: rgba(242, 245, 238, 0.84);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(26px, 3.5vw, 38px);
  border: var(--hair);
  border-radius: var(--radius-m);
  overflow: hidden;
  background: var(--ink-track);
}
.page-about .astat {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 16px 18px 18px;
  background: var(--ink-panel);
}
.page-about .astat__v {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 600;
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}
.page-about .astat__k {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--graphite);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
}
.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.68) contrast(1.08);
}
.page-about .about-hero__figure .note {
  margin-top: 14px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--graphite);
}
.page-about .v-note {
  margin: 14px 0 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--graphite);
}

/* ---------- 三条主线轨道入口 ---------- */
.page-about .about-rails {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: clamp(34px, 5vw, 64px);
}
.page-about .rail-card {
  display: grid;
  gap: 10px;
  padding: 18px 20px 20px;
  border: var(--hair);
  border-radius: var(--radius-m);
  background: var(--ink-panel);
  color: var(--bone);
  text-decoration: none;
  transition: border-color var(--ease), background-color var(--ease), transform var(--ease);
}
.page-about .rail-card:hover,
.page-about .rail-card:focus-visible {
  border-color: var(--about-accent);
  background: var(--about-lift);
  transform: translateY(-3px);
}
.page-about .rail-card--net { --about-accent: var(--lime); }
.page-about .rail-card--loan { --about-accent: var(--amber); }
.page-about .rail-card--stand { --about-accent: var(--volt); }

.page-about .rail-card__tag {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--about-accent);
}
.page-about .rail-card__name {
  font-family: var(--font-cond);
  font-weight: 900;
  font-size: clamp(22px, 3vw, 28px);
  line-height: 1.05;
  letter-spacing: -0.01em;
}
.page-about .rail-card__line {
  display: block;
  position: relative;
  height: 8px;
  border-radius: 999px;
  background: var(--ink-track);
  overflow: hidden;
}
.page-about .rail-card__fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 74%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--ink-panel), var(--about-accent));
}
.page-about .rail-card--loan .rail-card__fill { width: 56%; }
.page-about .rail-card--stand .rail-card__fill { width: 38%; }
.page-about .rail-card__desc {
  font-size: 13px;
  line-height: 1.6;
  color: var(--graphite);
}

/* ---------- 本页导航胶囊 ---------- */
.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(28px, 4vw, 48px);
  padding-top: clamp(20px, 3vw, 30px);
  border-top: var(--hair);
}
.page-about .about-jump .pill {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  border: 1px solid var(--ink-track);
  border-radius: 999px;
  background: transparent;
  color: var(--bone);
  font-size: 13.5px;
  text-decoration: none;
  transition: border-color var(--ease), background-color var(--ease), color var(--ease);
}
.page-about .about-jump .pill:hover,
.page-about .about-jump .pill:focus-visible {
  border-color: var(--lime);
  background: var(--lime);
  color: var(--ink-abyss);
}

/* ---------- 章节骨架（三线时间轴轨道） ---------- */
.page-about .about-sec {
  position: relative;
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
  margin-left: clamp(0px, 1.6vw, 16px);
  padding: clamp(40px, 6vw, 76px) 0 clamp(40px, 6vw, 76px) clamp(22px, 4vw, 46px);
  border-left: 1px solid var(--ink-track);
  --about-accent: var(--lime);
}
.page-about .about-sec__dot {
  position: absolute;
  left: -5.5px;
  top: clamp(50px, 7vw, 86px);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--about-accent);
  box-shadow: 0 0 0 5px var(--ink-abyss);
}
.page-about .about-sec--origin { --about-accent: var(--lime); }
.page-about .about-sec--team { --about-accent: var(--amber); }
.page-about .about-sec--lines { --about-accent: var(--volt); }
.page-about .about-sec--cadence { --about-accent: var(--lime-soft); }
.page-about .about-sec--coop { --about-accent: var(--wine); }
.page-about .about-sec--readers { --about-accent: var(--indigo); }

.page-about .about-sec h2 {
  margin: 8px 0 0;
  font-family: var(--font-cond);
  font-weight: 900;
  font-size: clamp(28px, 4.6vw, 48px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--bone);
}
.page-about .about-sec__body p {
  max-width: 68ch;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.82;
  color: rgba(242, 245, 238, 0.84);
}
.page-about .about-sec__body p + p {
  margin-top: 16px;
}
.page-about .about-sec__intro,
.page-about .about-sec__outro {
  max-width: 68ch;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.82;
  color: rgba(242, 245, 238, 0.84);
}
.page-about .about-sec__outro {
  margin-top: clamp(20px, 3vw, 32px);
  padding-left: 24px;
  border-left: 2px solid var(--lime);
  color: var(--lime-soft);
}
.page-about .about-sec__side .note {
  display: block;
  max-width: 46ch;
  padding-left: 20px;
  border-left: 2px solid var(--amber);
  font-size: 13px;
  line-height: 1.72;
  color: var(--graphite);
}
.page-about .about-sec__figure {
  margin: 0;
  max-width: 520px;
}
.page-about .about-sec__figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.66) contrast(1.1);
}

/* ---------- 团队分工矩阵 ---------- */
.page-about .team-matrix {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: clamp(8px, 2vw, 18px) 0 0;
  padding: 0;
  list-style: none;
}
.page-about .team-cell {
  --about-accent: var(--lime);
  display: grid;
  gap: 8px;
  align-content: start;
  padding: 20px 20px 22px;
  border: var(--hair);
  border-radius: var(--radius-m);
  background: var(--ink-panel);
  transition: border-color var(--ease), background-color var(--ease), transform var(--ease);
}
.page-about .team-cell:hover,
.page-about .team-cell:focus-within {
  border-color: var(--about-accent);
  background: var(--about-lift);
  transform: translateY(-4px);
}
.page-about .team-cell--collect { --about-accent: var(--lime); }
.page-about .team-cell--verify { --about-accent: var(--amber); }
.page-about .team-cell--viz { --about-accent: var(--volt); }

.page-about .team-cell__tag {
  justify-self: start;
  padding: 4px 13px;
  border: 1px solid var(--about-accent);
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--about-accent);
}
.page-about .team-cell__num {
  display: flex;
  align-items: baseline;
  gap: 6px;
}
.page-about .team-cell__n {
  font-family: var(--font-mono);
  font-size: 42px;
  font-weight: 600;
  line-height: 1;
  color: var(--bone);
  font-variant-numeric: tabular-nums;
}
.page-about .team-cell__unit {
  font-size: 13px;
  color: var(--graphite);
}
.page-about .team-cell__role {
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: 15px;
  color: var(--bone);
}
.page-about .team-cell__duty {
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--graphite);
}

/* ---------- 三条主线卡片 ---------- */
.page-about .lines-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: clamp(8px, 2vw, 18px);
}
.page-about .line-card {
  --about-accent: var(--lime);
  position: relative;
  display: grid;
  gap: 12px;
  align-content: start;
  padding: 26px 22px 24px;
  border: 1px solid var(--ink-track);
  border-radius: var(--radius-l);
  background: linear-gradient(180deg, var(--ink-panel), rgba(12, 32, 26, 0.35));
  overflow: hidden;
}
.page-about .line-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--about-accent);
}
.page-about .line-card--net { --about-accent: var(--lime); }
.page-about .line-card--loan { --about-accent: var(--amber); }
.page-about .line-card--stand { --about-accent: var(--volt); }

.page-about .line-card__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.page-about .line-card__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--about-accent);
}
.page-about .line-card h3 {
  margin: 0;
  font-family: var(--font-cond);
  font-weight: 900;
  font-size: clamp(20px, 2.6vw, 25px);
  line-height: 1.1;
  color: var(--bone);
}
.page-about .line-card > p {
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(242, 245, 238, 0.82);
}
.page-about .line-card__list {
  display: grid;
  gap: 9px;
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .line-card__list li {
  position: relative;
  padding-left: 16px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--graphite);
}
.page-about .line-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--about-accent);
}

.page-about .derived {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(18px, 3vw, 28px);
  padding-top: clamp(18px, 3vw, 26px);
  border-top: var(--hair);
}
.page-about .derived__item {
  padding-left: 18px;
  border-left: 2px solid var(--ink-track);
}
.page-about .derived__k {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: 15px;
  color: var(--lime-soft);
}
.page-about .derived__item p {
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--graphite);
}

/* ---------- 更新节奏 ---------- */
.page-about .cadence-track {
  display: block;
  width: 100%;
  height: auto;
  max-height: 76px;
}
.page-about .cadence-track__line {
  stroke: var(--ink-track);
  stroke-width: 2;
  stroke-dasharray: 6 8;
  fill: none;
}
.page-about .cadence-track__dot--1 { fill: var(--lime); }
.page-about .cadence-track__dot--2 { fill: var(--amber); }
.page-about .cadence-track__dot--3 { fill: var(--volt); }

.page-about .cadence {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .cadence__step {
  --about-accent: var(--lime);
  display: grid;
  gap: 8px;
  align-content: start;
  padding: 20px 20px 22px;
  border: var(--hair);
  border-radius: var(--radius-m);
  background: var(--ink-panel);
  transition: border-color var(--ease), background-color var(--ease);
}
.page-about .cadence__step:hover,
.page-about .cadence__step:focus-within {
  border-color: var(--about-accent);
  background: var(--about-lift);
}
.page-about .cadence__step--a { --about-accent: var(--lime); }
.page-about .cadence__step--b { --about-accent: var(--amber); }
.page-about .cadence__step--c { --about-accent: var(--volt); }

.page-about .cadence__index {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--about-accent);
}
.page-about .cadence__when {
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--graphite);
}
.page-about .cadence__t {
  margin: 0;
  font-family: var(--font-cond);
  font-weight: 900;
  font-size: 20px;
  line-height: 1.15;
  color: var(--bone);
}
.page-about .cadence__d {
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--graphite);
}

/* ---------- 协作与纠错 ---------- */
.page-about .coop {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}
.page-about .coop__text > p {
  max-width: 62ch;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.82;
  color: rgba(242, 245, 238, 0.84);
  margin-top: 16px;
}
.page-about .coop__list {
  display: grid;
  gap: 14px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}
.page-about .coop__item {
  display: grid;
  gap: 8px;
  padding: 16px 18px 18px;
  border-radius: var(--radius-m);
  background: rgba(124, 46, 62, 0.22);
  border: 1px solid rgba(124, 46, 62, 0.55);
  transition: border-color var(--ease), background-color var(--ease);
}
.page-about .coop__item:hover,
.page-about .coop__item:focus-within {
  border-color: var(--lime-soft);
  background: rgba(75, 63, 158, 0.24);
}
.page-about .coop__pill {
  justify-self: start;
  padding: 5px 14px;
  border: 1px solid var(--lime-soft);
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--lime-soft);
  background: transparent;
}
.page-about .coop__pill--lead {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--ink-abyss);
}
.page-about .coop__item p {
  font-size: 13.5px;
  line-height: 1.72;
  color: rgba(242, 245, 238, 0.76);
}
.page-about .coop__fix {
  margin-top: clamp(18px, 3vw, 26px);
  padding-left: 22px;
  border-left: 2px solid var(--alert);
  font-size: 14px;
  line-height: 1.75;
  color: var(--lime-soft);
}
.page-about .coop__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}
.page-about .coop__figure {
  margin: 0;
}
.page-about .coop__figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.62) contrast(1.12);
}

/* ---------- 读者场景 ---------- */
.page-about .readers {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(8px, 2vw, 18px);
}
.page-about .reader-card {
  --about-accent: var(--lime);
  display: grid;
  gap: 10px;
  align-content: start;
  padding: 22px 20px 24px;
  border: var(--hair);
  border-left: 3px solid var(--about-accent);
  border-radius: 0 var(--radius-m) var(--radius-m) 0;
  background: var(--ink-panel);
  transition: background-color var(--ease), transform var(--ease);
}
.page-about .reader-card:hover,
.page-about .reader-card:focus-within {
  background: var(--about-lift);
  transform: translateX(3px);
}
.page-about .reader-card--fan { --about-accent: var(--lime); }
.page-about .reader-card--fm { --about-accent: var(--amber); }
.page-about .reader-card--media { --about-accent: var(--volt); }
.page-about .reader-card--brand { --about-accent: var(--indigo); }

.page-about .reader-card h3 {
  margin: 0;
  font-family: var(--font-cond);
  font-weight: 900;
  font-size: 19px;
  line-height: 1.2;
  color: var(--bone);
}
.page-about .reader-card > p {
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(242, 245, 238, 0.78);
}
.page-about .reader-card__list {
  display: grid;
  gap: 7px;
  margin: 2px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .reader-card__list li {
  position: relative;
  padding-left: 15px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  line-height: 1.6;
  color: var(--graphite);
}
.page-about .reader-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 5px;
  height: 5px;
  border-radius: 1px;
  background: var(--about-accent);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(40px, 6vw, 76px);
  padding: clamp(28px, 4vw, 46px) clamp(22px, 4vw, 48px);
  border: var(--hair);
  border-radius: var(--radius-l);
  background: linear-gradient(120deg, var(--ink-panel), rgba(22, 70, 58, 0.5));
}
.page-about .about-cta__t {
  font-family: var(--font-cond);
  font-weight: 900;
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--bone);
}
.page-about .about-cta__d {
  margin-top: 12px;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--graphite);
}
.page-about .about-cta__row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-sec__figure {
    max-width: 100%;
  }
}

@media (min-width: 780px) {
  .page-about .cadence {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .derived {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .readers {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-rails {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .team-matrix {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .lines-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 980px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
  .page-about .coop {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
  .page-about .about-sec__figure {
    max-width: 560px;
    margin-left: auto;
  }
}

@media (min-width: 1180px) {
  .page-about .about-sec {
    padding-left: 56px;
  }
  .page-about .readers {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .coop__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .rail-card,
  .page-about .team-cell,
  .page-about .cadence__step,
  .page-about .reader-card,
  .page-about .coop__item,
  .page-about .about-jump .pill {
    transition: none;
  }
  .page-about .rail-card:hover,
  .page-about .team-cell:hover,
  .page-about .reader-card:hover {
    transform: none;
  }
}