.page-about {
  --about-rail: 248px;
  --about-gap: clamp(20px, 3vw, 40px);
  --about-line-soft: rgba(29, 53, 96, 0.72);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

.page-about .about-split,
.page-about .about-team__grid,
.page-about .about-eco__inner {
  display: grid;
  gap: var(--about-gap);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 5vw, 56px) 0 clamp(32px, 6vw, 72px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 420px;
  background:
    radial-gradient(60% 70% at 22% 30%, rgba(51, 242, 227, 0.16), transparent 68%),
    radial-gradient(45% 60% at 82% 10%, rgba(255, 124, 51, 0.12), transparent 70%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    to bottom,
    rgba(233, 241, 255, 0.035) 0,
    rgba(233, 241, 255, 0.035) 1px,
    transparent 1px,
    transparent 6px
  );
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-size: clamp(36px, 9vw, 78px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: 0.02em;
  color: var(--text);
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 42ch;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__card {
  position: relative;
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(12, 23, 51, 0.96), rgba(5, 9, 26, 0.9));
  border: 1px solid rgba(51, 242, 227, 0.28);
  box-shadow: 0 0 0 1px rgba(51, 242, 227, 0.08), 0 24px 60px rgba(4, 18, 26, 0.7);
}

.page-about .about-hero__card-kicker {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 12px;
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-hero__num {
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.02em;
}

.page-about .about-hero__card-note {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--about-line-soft);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 数据带 ---------- */
.page-about .about-band-section {
  padding-top: clamp(8px, 2vw, 16px);
}

.page-about .about-band {
  display: grid;
  gap: 1px;
  background: var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .about-band__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  background: var(--panel);
}

.page-about .about-band__item--cyan {
  background: linear-gradient(140deg, rgba(51, 242, 227, 0.16), rgba(12, 23, 51, 0.95));
}

.page-about .about-band__item--orange {
  background: linear-gradient(140deg, rgba(255, 124, 51, 0.16), rgba(12, 23, 51, 0.95));
}

.page-about .about-band__num {
  font-size: clamp(24px, 4vw, 34px);
  font-weight: 700;
  color: var(--text);
}

.page-about .about-band__label {
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .about-track__figure {
  margin: 0 0 clamp(24px, 4vw, 40px);
}

.page-about .about-rail {
  padding: 18px 20px;
  border-radius: var(--radius-sm);
  background: rgba(12, 23, 51, 0.72);
  border: 1px solid var(--about-line-soft);
}

.page-about .about-rail__title {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-rail__link .og-mono {
  color: var(--cyan-deep);
  font-size: 12px;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  background: rgba(51, 242, 227, 0.1);
  color: var(--text);
}

.page-about .about-rail__note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--about-line-soft);
  font-size: 12px;
  line-height: 1.7;
  color: var(--warmgray);
}

.page-about .about-phases {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-phase {
  padding-left: 18px;
  border-left: 2px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-phase__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-phase__idx {
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-phase__title {
  margin: 0;
  font-size: clamp(19px, 2.4vw, 24px);
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--text);
}

.page-about .about-phase__cells {
  display: grid;
  gap: 1px;
  margin-top: 16px;
  background: var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .about-phase__cell {
  padding: 16px 18px;
  background: var(--panel);
}

.page-about .about-phase__cell--gain {
  background: linear-gradient(150deg, rgba(51, 242, 227, 0.12), rgba(12, 23, 51, 0.96));
}

.page-about .about-phase__label {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-phase__cell--gain .about-phase__label {
  color: var(--cyan);
}

.page-about .about-phase__cell p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text);
}

/* ---------- 折线图 ---------- */
.page-about .about-chart {
  padding: clamp(18px, 3vw, 28px);
  border-radius: var(--radius);
  background: rgba(12, 23, 51, 0.66);
  border: 1px solid var(--about-line-soft);
}

.page-about .about-chart svg {
  width: 100%;
  height: auto;
  display: block;
}

.page-about .about-chart__grid {
  stroke: rgba(29, 53, 96, 0.9);
  stroke-width: 1;
}

.page-about .about-chart__tick {
  fill: var(--muted);
  font-size: 12px;
}

.page-about .about-chart__line {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.page-about .about-chart__dot {
  fill: var(--panel);
  stroke: var(--cyan);
  stroke-width: 2;
}

.page-about .about-chart__dot--now {
  fill: var(--orange);
  stroke: var(--orange);
}

.page-about .about-chart__legend {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-chart__legend li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-chart__key {
  width: 16px;
  height: 3px;
  border-radius: 2px;
  display: inline-block;
}

.page-about .about-chart__key--cyan {
  background: var(--cyan);
}

.page-about .about-chart__key--orange {
  background: var(--orange);
}

/* ---------- 团队 ---------- */
.page-about .about-team__figure {
  margin: 0;
}

.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .about-team__item {
  padding: 18px 20px;
  background: var(--panel);
}

.page-about .about-team__name {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--text);
}

.page-about .about-team__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 频道体系 ---------- */
.page-about .about-reach__figure {
  margin: 0 0 clamp(24px, 4vw, 36px);
}

.page-about .about-reach__cols {
  display: grid;
  gap: 1px;
  background: var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .about-reach__col {
  padding: 20px;
  background: rgba(12, 23, 51, 0.86);
}

.page-about .about-reach__name {
  margin: 0 0 8px;
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 800;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .about-reach__col p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text);
}

/* ---------- 回访反馈 ---------- */
.page-about .about-feedback__wrap {
  display: grid;
  gap: var(--about-gap);
}

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

.page-about .about-feedback__step {
  padding: 18px 20px;
  border-radius: var(--radius-sm);
  background: linear-gradient(140deg, rgba(201, 161, 92, 0.1), rgba(12, 23, 51, 0.92));
  border: 1px solid rgba(201, 161, 92, 0.28);
}

.page-about .about-feedback__no {
  display: block;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-feedback__step h3 {
  margin: 8px 0 6px;
  font-size: 17px;
  font-weight: 800;
  color: var(--text);
}

.page-about .about-feedback__step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-case {
  border-radius: var(--radius-sm);
  background: rgba(12, 23, 51, 0.7);
  border: 1px solid var(--about-line-soft);
  overflow: hidden;
  align-self: start;
}

.page-about .about-case__summary {
  cursor: pointer;
  padding: 18px 20px;
  font-size: 16px;
  font-weight: 700;
  color: var(--gold);
  list-style: none;
}

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

.page-about .about-case__summary::before {
  content: "▸ ";
  color: var(--warmgray);
}

.page-about .about-case[open] .about-case__summary::before {
  content: "▾ ";
}

.page-about .about-case__body {
  padding: 0 20px 20px;
  display: grid;
  gap: 10px;
}

.page-about .about-case__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 合作与自查 ---------- */
.page-about .about-eco__copy p {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 46ch;
}

.page-about .about-eco__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-eco__stats {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
  align-self: start;
}

.page-about .about-eco__stat {
  padding: 18px;
  background: var(--panel);
}

.page-about .about-eco__stat dt {
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-eco__stat dd {
  margin: 8px 0 0;
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 700;
  color: var(--text);
}

/* ---------- 下一步 ---------- */
.page-about .about-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .about-next__link {
  display: grid;
  gap: 6px;
  padding: 20px;
  background: var(--panel);
  text-decoration: none;
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: rgba(51, 242, 227, 0.1);
}

.page-about .about-next__label {
  font-size: 17px;
  font-weight: 800;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .about-next__desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-next__contact {
  margin: 24px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-next__contact .og-mono {
  color: var(--text);
}

/* ---------- 移动端适配 ---------- */
@media (max-width: 600px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-chart__legend {
    gap: 12px;
  }

  .page-about .about-phase {
    padding-left: 14px;
  }
}

@media (min-width: 760px) {
  .page-about .about-band {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

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

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
  }

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

  .page-about .about-feedback__flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

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

@media (min-width: 980px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.65fr);
    align-items: center;
  }

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

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

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

  .page-about .about-eco__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-next__link {
    transition: none;
  }
}