.page-about {
  color: var(--paper);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  padding: 28px 0 40px;
}

.page-about .about-hero__lead h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 6.2vw, 64px);
  line-height: 1.04;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lead .lede {
  margin-top: 20px;
  max-width: 40em;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-fact {
  background: var(--turf);
  padding: 16px 18px;
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-fact__num {
  font-size: 26px;
  line-height: 1;
  color: var(--ember);
  letter-spacing: -0.01em;
}

.page-about .about-fact__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-dim);
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: end;
    padding: 52px 0 56px;
  }

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

/* ---------- 封面图 ---------- */
.page-about .about-cover {
  margin: 0 0 8px;
}

.page-about .about-cover .figure__frame {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--turf);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

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

/* ---------- 纵轴流 ---------- */
.page-about .about-stream {
  position: relative;
  margin-top: 64px;
}

.page-about .about-chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  row-gap: 16px;
  padding-bottom: 72px;
}

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

.page-about .about-chapter__rail .chapter-num {
  color: var(--flare);
  font-size: 13px;
  letter-spacing: 0.12em;
}

.page-about .about-chapter__tag {
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--note);
}

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

.page-about .about-chapter__body > * + * {
  margin-top: 24px;
}

@media (min-width: 900px) {
  .page-about .about-stream::before {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    left: 84px;
    width: 1px;
    background: linear-gradient(
      180deg,
      transparent,
      var(--line-strong) 3%,
      var(--line-strong) 94%,
      transparent
    );
  }

  .page-about .about-chapter {
    grid-template-columns: 84px minmax(0, 1fr);
    column-gap: 36px;
    row-gap: 0;
    padding-bottom: 108px;
  }

  .page-about .about-chapter__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding-top: 6px;
  }
}

/* ---------- 里程碑色带 ---------- */
.page-about .about-milestones {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-milestones__item {
  position: relative;
  background: var(--turf);
  padding: 20px 18px 22px;
}

.page-about .about-milestones__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--flare);
}

.page-about .about-milestones__item:nth-child(2)::before { background: var(--ember); }
.page-about .about-milestones__item:nth-child(3)::before { background: var(--signal); }
.page-about .about-milestones__item:nth-child(4)::before { background: var(--silver); }

.page-about .about-milestones__year {
  display: block;
  font-size: 22px;
  line-height: 1;
  color: var(--ember);
  margin-bottom: 10px;
}

.page-about .about-milestones__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

@media (min-width: 800px) {
  .page-about .about-milestones {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 三条主线 ---------- */
.page-about .about-tracks {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-track {
  background: var(--turf);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 18px 20px;
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease),
    box-shadow 0.35s var(--ease);
}

.page-about .about-track:hover,
.page-about .about-track:focus-within {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.38);
}

.page-about .about-track__kicker {
  display: block;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--signal);
  margin-bottom: 10px;
}

.page-about .about-track__title {
  margin: 0 0 10px;
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-track p {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-about .about-track__sample {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.6;
  color: var(--note);
}

.page-about .about-track__sample .mono {
  color: var(--signal);
  font-size: 12px;
  letter-spacing: 0.06em;
  margin-right: 8px;
}

@media (min-width: 900px) {
  .page-about .about-tracks {
    grid-template-columns: 5fr 4fr 3fr;
    gap: var(--gap);
    align-items: start;
  }

  .page-about .about-track--wide {
    padding: 24px 22px 22px;
  }
}

/* ---------- 简史四段 ---------- */
.page-about .about-entry {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

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

.page-about .about-entry__figure .figure__frame {
  aspect-ratio: 3 / 2;
  overflow: hidden;
  background: var(--turf);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

@media (min-width: 900px) {
  .page-about .about-entry {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 40px;
  }
}

.page-about .about-steps {
  border-top: 1px solid var(--line);
}

.page-about .about-step {
  border-bottom: 1px solid var(--line);
}

.page-about .about-step__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-step__head::after {
  content: "＋";
  margin-left: auto;
  font-size: 15px;
  color: var(--note);
  transition: transform 0.3s var(--ease), color 0.3s var(--ease);
}

.page-about .about-step[open] .about-step__head::after {
  transform: rotate(45deg);
  color: var(--flare);
}

.page-about .about-step__num {
  flex: 0 0 auto;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--flare);
}

.page-about .about-step__name {
  font-size: 17px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-step__panel {
  padding: 0 0 22px 34px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-step__panel p {
  margin: 0;
}

/* ---------- 复核比例 ---------- */
.page-about .about-meter {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 20px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--turf);
}

.page-about .about-meter__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
}

.page-about .about-meter__label {
  font-size: 14px;
  color: var(--ink-soft);
}

.page-about .about-meter__num {
  font-size: 14px;
  color: var(--ember);
}

.page-about .about-meter__track {
  height: 10px;
  border-radius: 1px;
  background: rgba(199, 206, 208, 0.14);
  overflow: hidden;
}

.page-about .about-meter__track + .about-meter__row {
  margin-top: 16px;
}

.page-about .about-meter__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--signal), var(--flare));
}

.page-about .about-meter__fill--full {
  width: 100%;
}

.page-about .about-meter__fill--audit {
  width: 15%;
  background: linear-gradient(90deg, var(--ember), var(--flare));
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-team__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "name num"
    "bar bar";
  gap: 8px 14px;
  align-items: center;
}

.page-about .about-team__name {
  grid-area: name;
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-team__num {
  grid-area: num;
  text-align: right;
  font-size: 14px;
  color: var(--ember);
}

.page-about .about-team__bar {
  grid-area: bar;
  display: block;
  height: 8px;
  border-radius: 1px;
  background: rgba(199, 206, 208, 0.14);
  overflow: hidden;
}

.page-about .about-team__bar span {
  display: block;
  height: 100%;
  background: var(--signal);
}

.page-about .about-team__item:nth-child(1) .about-team__bar span { width: 38.9%; background: var(--flare); }
.page-about .about-team__item:nth-child(2) .about-team__bar span { width: 27.8%; background: var(--ember); }
.page-about .about-team__item:nth-child(3) .about-team__bar span { width: 16.7%; background: var(--signal); }
.page-about .about-team__item:nth-child(4) .about-team__bar span { width: 16.7%; background: var(--silver); }

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

.page-about .about-team__figure .figure__frame {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--turf);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

@media (min-width: 640px) {
  .page-about .about-team__item {
    grid-template-columns: 148px minmax(0, 1fr) 64px;
    grid-template-areas: "name bar num";
  }
}

/* ---------- 合作共建 ---------- */
.page-about .about-partners {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-partners__item {
  background: var(--turf);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: 20px 18px 22px;
}

.page-about .about-partners__tag {
  display: inline-block;
  align-self: start;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--signal);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 4px 10px;
}

.page-about .about-partners__body h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-partners__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-soft);
}

@media (min-width: 760px) {
  .page-about .about-partners__item {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
    padding: 24px 22px;
  }
}

/* ---------- 结尾动作 ---------- */
.page-about .about-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  padding: 26px 20px 28px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: linear-gradient(
    135deg,
    rgba(255, 75, 31, 0.16),
    rgba(53, 224, 200, 0.08) 58%,
    rgba(16, 36, 28, 0) 100%
  );
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-soft);
  max-width: 32em;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

@media (min-width: 820px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
    padding: 32px 30px;
  }
}

/* ---------- 末章收尾留白 ---------- */
.page-about .about-chapter:last-child {
  padding-bottom: 24px;
}