.page-about {
  --about-measure: 68ch;
  --about-rule: var(--moss-line);
  --about-section-gap: clamp(3.5rem, 8vw, 7rem);
  --about-row-gap: clamp(1.5rem, 3.5vw, 3rem);
  background:
    radial-gradient(120% 55% at 10% 0%, rgba(53, 240, 208, 0.055) 0%, transparent 58%),
    radial-gradient(90% 40% at 100% 78%, rgba(255, 179, 71, 0.04) 0%, transparent 60%),
    var(--ink-abyss);
  color: var(--mist-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: clip;
}

.page-about a {
  color: var(--fluoro-cyan);
  text-decoration: none;
}

.page-about a:hover {
  color: var(--mist-text);
}

.page-about a:focus-visible {
  outline: 2px solid var(--fluoro-cyan);
  outline-offset: 2px;
  border-radius: 2px;
}

.page-about .shell {
  width: 100%;
  max-width: 1440px;
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.page-about .idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist-dim);
}

.page-about .data-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--mist-text);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-top: clamp(2rem, 5vw, 4.5rem);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist-dim);
  margin: 0 0 clamp(2rem, 5vw, 3.5rem);
}

.page-about .crumbs a {
  color: var(--mist-dim);
  transition: color var(--dur) var(--ease);
}

.page-about .crumbs a:hover {
  color: var(--fluoro-cyan);
}

.page-about .crumbs__sep {
  color: var(--moss-line);
}

.page-about .about-hero__kicker {
  margin: 0 0 1.2rem;
  color: var(--fluoro-cyan);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: 0.01em;
  line-height: 1.14;
  font-size: clamp(2.1rem, 5.6vw, 4.4rem);
  color: var(--mist-text);
  max-width: 22ch;
}

.page-about .about-hero__title-accent {
  color: var(--fluoro-cyan);
  display: inline-block;
  border-bottom: 1px solid rgba(53, 240, 208, 0.32);
  padding-bottom: 0.08em;
}

.page-about .about-hero__lede {
  margin: clamp(1.6rem, 3.5vw, 2.4rem) 0 0;
  max-width: var(--about-measure);
  font-size: clamp(1rem, 1.15vw, 1.09rem);
  line-height: 1.8;
  color: var(--mist-text);
}

.page-about .about-hero__scale {
  list-style: none;
  margin: clamp(2.4rem, 5vw, 3.6rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .about-hero__scale li {
  background: var(--ink-deep);
  padding: 1.1rem 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.page-about .about-hero__scale .data-num {
  font-size: clamp(1.7rem, 3.6vw, 2.4rem);
  line-height: 1;
  font-weight: 700;
  color: var(--fluoro-cyan);
  -webkit-text-stroke: 0.5px rgba(53, 240, 208, 0.45);
}

.page-about .about-hero__scale-unit {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist-dim);
}

/* ---------- 章节轴 ---------- */

.page-about .about-axis {
  position: sticky;
  top: var(--topline-h);
  z-index: 6;
  margin-top: clamp(2rem, 4vw, 3rem);
  background: rgba(6, 17, 15, 0.9);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--about-rule);
}

.page-about .about-axis__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  overflow-x: auto;
  scrollbar-width: thin;
  scroll-snap-type: x proximity;
}

.page-about .about-axis__item {
  flex: 0 0 auto;
  scroll-snap-align: start;
}

.page-about .about-axis__link {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.9rem 1.1rem;
  border-right: 1px solid var(--about-rule);
  color: var(--mist-dim);
  font-size: 13px;
  white-space: nowrap;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-axis__link:hover,
.page-about .about-axis__link:focus-visible {
  background: var(--cyan-glass);
  color: var(--mist-text);
}

.page-about .about-axis__num {
  color: var(--moss-line);
  font-size: 10px;
}

.page-about .about-axis__link:hover .about-axis__num,
.page-about .about-axis__link:focus-visible .about-axis__num {
  color: var(--fluoro-cyan);
}

/* ---------- 通用章节 ---------- */

.page-about .about-section {
  padding-top: var(--about-section-gap);
}

.page-about .about-section__head {
  max-width: var(--about-measure);
  margin-bottom: var(--about-row-gap);
}

.page-about .about-section__num {
  margin: 0 0 0.8rem;
  color: var(--amber-orange);
}

.page-about .about-section__title {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: 0.01em;
  line-height: 1.16;
  font-size: clamp(1.7rem, 3.8vw, 3rem);
  color: var(--mist-text);
}

.page-about .about-section__lede {
  margin: 0;
  max-width: var(--about-measure);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--mist-text);
}

.page-about .about-section__tail {
  max-width: var(--about-measure);
  margin: var(--about-row-gap) 0 0;
  padding-top: 1.2rem;
  border-top: 1px solid var(--about-rule);
  line-height: 1.8;
  color: var(--mist-text);
}

.page-about .about-section--final {
  padding-bottom: clamp(3rem, 7vw, 5.5rem);
}

/* ---------- 数据条 ---------- */

.page-about .about-bar {
  margin-top: var(--about-section-gap);
  border-top: 1px solid var(--about-rule);
  border-bottom: 1px solid var(--about-rule);
  background: linear-gradient(90deg, rgba(53, 240, 208, 0.07) 0%, rgba(53, 240, 208, 0) 62%);
}

.page-about .about-bar__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-rule);
}

.page-about .about-bar__item {
  background: var(--ink-deep);
  padding: 1.3rem 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.page-about .about-bar__label {
  margin: 0;
}

.page-about .about-bar__value {
  font-size: clamp(1.4rem, 3vw, 2rem);
  line-height: 1.1;
  font-weight: 700;
  color: var(--amber-orange);
}

/* ---------- 字段结构 ---------- */

.page-about .about-fields {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-row-gap);
}

.page-about .about-fields__list {
  display: flex;
  flex-direction: column;
}

.page-about .about-field {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.35rem;
  padding: 1.1rem 0.6rem 1.1rem 0.5rem;
  border-bottom: 1px solid var(--about-rule);
  border-left: 2px solid transparent;
  transition: background var(--dur) var(--ease), border-left-color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-about .about-field:first-child {
  border-top: 1px solid var(--about-rule);
}

.page-about .about-field:hover,
.page-about .about-field:focus-visible {
  background: var(--cyan-glass);
  border-left-color: var(--fluoro-cyan);
  padding-left: 0.9rem;
  outline: none;
}

.page-about .about-field:focus-visible {
  outline: 2px solid var(--fluoro-cyan);
  outline-offset: 2px;
}

.page-about .about-field__name {
  color: var(--fluoro-cyan);
}

.page-about .about-field__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  color: var(--mist-text);
}

.page-about .about-field__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist-dim);
}

.page-about .figure {
  margin: 0;
}

.page-about .figure__frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--about-rule);
  background: var(--ink-surface);
}

.page-about .figure--wide .figure__frame {
  aspect-ratio: 21 / 9;
}

.page-about .figure__frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .figure__caption {
  margin-top: 0.8rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--mist-dim);
}

/* ---------- 四阶段 ---------- */

.page-about .about-phases__figure {
  margin-bottom: var(--about-row-gap);
}

.page-about .about-phases {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .about-phase {
  background: var(--ink-deep);
}

.page-about .about-phase[open] {
  background: var(--ink-surface);
}

.page-about .about-phase__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.7rem;
  padding: 1.1rem 1.1rem;
  cursor: pointer;
  list-style: none;
  border-left: 2px solid transparent;
  transition: background var(--dur) var(--ease), border-left-color var(--dur) var(--ease);
}

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

.page-about .about-phase__summary:hover {
  background: var(--cyan-glass);
  border-left-color: var(--fluoro-cyan);
}

.page-about .about-phase__summary:focus-visible {
  outline: 2px solid var(--fluoro-cyan);
  outline-offset: -2px;
}

.page-about .about-phase[open] .about-phase__summary {
  border-left-color: var(--fluoro-cyan);
}

.page-about .about-phase__idx {
  color: var(--moss-line);
}

.page-about .about-phase__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--mist-text);
}

.page-about .about-phase__stage {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--amber-orange);
}

.page-about .about-phase__text {
  margin: 0;
  padding: 0 1.1rem 1.2rem;
  max-width: var(--about-measure);
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist-dim);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .about-team__cell {
  background: var(--ink-deep);
  padding: 1.4rem 1.2rem 1.6rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  transition: background var(--dur) var(--ease);
}

.page-about .about-team__cell:hover {
  background: var(--ink-surface);
}

.page-about .about-team__head {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
}

.page-about .about-team__count {
  font-size: clamp(2rem, 4.5vw, 3rem);
  line-height: 1;
  font-weight: 700;
  color: var(--fluoro-cyan);
  -webkit-text-stroke: 0.6px rgba(53, 240, 208, 0.45);
}

.page-about .about-team__role {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--mist-text);
}

.page-about .about-team__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist-dim);
}

.page-about .about-team__units {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: auto;
}

.page-about .about-team__units span {
  width: 9px;
  height: 9px;
  border-radius: 1px;
  background: var(--moss-line);
  transition: background var(--dur) var(--ease);
}

.page-about .about-team__cell:hover .about-team__units span {
  background: var(--fluoro-cyan);
}

.page-about .about-team__cell--wide:hover .about-team__units span {
  background: var(--amber-orange);
}

/* ---------- 覆盖与节奏 ---------- */

.page-about .about-coverage {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-row-gap);
}

.page-about .about-coverage__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .about-coverage__stat {
  background: var(--ink-deep);
  padding: 1.4rem 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.page-about .about-coverage__num {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  line-height: 1;
  font-weight: 700;
  color: var(--mist-text);
}

.page-about .about-coverage__plus {
  color: var(--amber-orange);
}

.page-about .about-coverage__unit {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--fluoro-cyan);
}

.page-about .about-coverage__note {
  margin: 0.4rem 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist-dim);
}

.page-about .about-coverage__rhythm-title {
  margin: 0 0 1.2rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  color: var(--mist-text);
}

.page-about .about-rhythm {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-rhythm__item {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1rem 0 1rem 1rem;
  border-bottom: 1px solid var(--about-rule);
  border-left: 2px solid var(--moss-line);
  transition: border-left-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-rhythm__item:hover {
  border-left-color: var(--amber-orange);
  background: rgba(255, 179, 71, 0.05);
}

.page-about .about-rhythm__time {
  color: var(--amber-orange);
}

.page-about .about-rhythm__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist-text);
}

/* ---------- 五年纵深 ---------- */

.page-about .about-years {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-row-gap);
}

.page-about .about-years__track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 0;
  position: relative;
}

.page-about .about-years__track::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  background: var(--about-rule);
}

.page-about .about-years__node {
  position: relative;
  flex: 1 1 0;
  display: flex;
  justify-content: center;
  padding: 1.2rem 0;
}

.page-about .about-years__node span {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--ink-abyss);
  border: 1px solid var(--about-rule);
  color: var(--mist-dim);
  font-size: 10px;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-years__node:hover span {
  border-color: var(--fluoro-cyan);
  color: var(--fluoro-cyan);
}

.page-about .about-years__node--current span {
  border-color: var(--fluoro-cyan);
  background: var(--cyan-glass);
  color: var(--fluoro-cyan);
}

.page-about .about-years__body {
  max-width: var(--about-measure);
}

.page-about .about-years__body p {
  margin: 0 0 1.4em;
  line-height: 1.8;
  color: var(--mist-text);
}

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

/* ---------- 长期收益 ---------- */

.page-about .about-track__figure {
  margin-bottom: var(--about-row-gap);
}

.page-about .about-track {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
}

.page-about .about-track__item {
  padding-top: 1rem;
  border-top: 1px solid var(--about-rule);
  transition: border-top-color var(--dur) var(--ease);
}

.page-about .about-track__item:hover {
  border-top-color: var(--fluoro-cyan);
}

.page-about .about-track__title {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--mist-text);
}

.page-about .about-track__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist-dim);
}

/* ---------- 行动区 ---------- */

.page-about .about-cta {
  margin-top: var(--about-section-gap);
  padding: clamp(1.6rem, 4vw, 2.6rem);
  border: 1px solid var(--about-rule);
  background:
    linear-gradient(135deg, rgba(53, 240, 208, 0.08) 0%, rgba(6, 17, 15, 0) 58%),
    var(--ink-deep);
  backdrop-filter: blur(6px);
}

.page-about .about-cta__text {
  margin: 0 0 1.4rem;
  max-width: 52ch;
  line-height: 1.8;
  color: var(--mist-text);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.page-about .about-cta__contact {
  margin: 1.6rem 0 0;
  padding-top: 1.2rem;
  border-top: 1px solid var(--about-rule);
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist-dim);
}

.page-about .about-cta__contact a {
  color: var(--fluoro-cyan);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero__scale {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

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

  .page-about .about-team__cell--wide {
    grid-column: span 2;
  }
}

@media (min-width: 900px) {
  .page-about {
    font-size: 17px;
  }

  .page-about .about-field {
    grid-template-columns: minmax(140px, 200px) minmax(0, 1fr);
    column-gap: 1.6rem;
    align-items: baseline;
  }

  .page-about .about-field__note {
    grid-column: 2;
    max-width: 56ch;
  }

  .page-about .about-fields {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

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

  .page-about .about-coverage__stats {
    grid-template-columns: 1fr;
  }

  .page-about .about-years {
    grid-template-columns: minmax(220px, 280px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-years__track {
    flex-direction: column;
    align-items: flex-start;
    padding-left: 0;
  }

  .page-about .about-years__track::before {
    left: 15px;
    right: auto;
    top: 0;
    bottom: 0;
    width: 1px;
    height: auto;
  }

  .page-about .about-years__node {
    justify-content: flex-start;
    padding: 0 0 1.6rem;
    width: 100%;
    flex: 0 0 auto;
  }

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

@media (min-width: 1180px) {
  .page-about .about-hero__scale li {
    padding: 1.4rem 1.4rem;
  }

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

  .page-about .about-team__cell--wide {
    grid-column: span 2;
    grid-row: span 1;
  }

  .page-about .about-phase__summary {
    padding: 1.3rem 1.5rem;
  }

  .page-about .about-phase__text {
    padding: 0 1.5rem 1.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
  }
}