.page-about {
  --about-band: var(--purple);
  --about-gap: clamp(52px, 8vw, 116px);
  --about-panel: linear-gradient(155deg, var(--ink-800), var(--ink-900));
  display: block;
  overflow-x: hidden;
}

.page-about .page-about__crumbs {
  padding-top: clamp(18px, 3vw, 30px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding-block: clamp(28px, 5vw, 60px) clamp(46px, 7vw, 92px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -18%;
  right: -14%;
  width: min(720px, 88vw);
  height: min(720px, 88vw);
  background:
    radial-gradient(circle at 34% 32%, rgba(123, 77, 255, 0.42), transparent 62%),
    radial-gradient(circle at 68% 70%, rgba(37, 217, 232, 0.22), transparent 60%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  left: -10%;
  bottom: 4%;
  width: 52%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-strong) 30%, var(--purple) 100%);
  transform: rotate(-8deg);
  opacity: 0.7;
  pointer-events: none;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 54px);
  align-items: center;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  max-width: 14ch;
}

.page-about .about-hero__lead {
  margin: 24px 0 0;
  max-width: 54ch;
  font-size: clamp(17px, 1.7vw, 19px);
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-hero__note {
  margin: 16px 0 0;
  max-width: 56ch;
  color: var(--muted);
  line-height: 1.78;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-hero__figure {
  margin: 0;
  clip-path: polygon(0 7%, 100% 0, 100% 93%, 0 100%);
  border: 1px solid var(--line);
}

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

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  position: relative;
  padding-block: var(--about-gap);
}

.page-about .about-chapter + .about-chapter,
.page-about .about-closing {
  border-top: 1px solid var(--line);
}

.page-about .about-chapter__head {
  display: flex;
  align-items: flex-start;
  gap: clamp(14px, 3vw, 30px);
}

.page-about .about-chapter__num {
  flex: none;
  font-size: clamp(30px, 4.6vw, 56px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: transparent;
  -webkit-text-stroke: 1.4px var(--purple-soft);
  text-stroke: 1.4px var(--purple-soft);
}

.page-about .about-chapter__titles {
  padding-top: 2px;
}

.page-about .about-chapter__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-chapter__kicker::before {
  content: "";
  width: 26px;
  height: 2px;
  background: linear-gradient(90deg, var(--purple), var(--cyan));
}

.page-about .about-chapter__title {
  margin: 10px 0 0;
  font-size: clamp(24px, 3vw, 38px);
  font-weight: 700;
  line-height: 1.25;
  color: var(--text);
}

.page-about .about-chapter__intro {
  margin-top: 22px;
  color: var(--muted);
}

.page-about .about-chapter__body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 46px);
  margin-top: clamp(26px, 4vw, 44px);
}

/* ---------- 引文面板 ---------- */
.page-about .about-quote {
  align-self: start;
  border: 1px solid var(--line);
  border-left: 3px solid var(--purple);
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(123, 77, 255, 0.16), rgba(37, 217, 232, 0.05));
  padding: 20px 22px;
}

.page-about .about-quote__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

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

.page-about .about-quote__summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--cyan);
  transition: transform var(--dur) var(--ease);
}

.page-about .about-quote[open] .about-quote__summary::after {
  transform: rotate(45deg);
}

.page-about .about-quote__text {
  margin: 16px 0 0;
  padding: 0;
  border: 0;
}

.page-about .about-quote__text p {
  margin: 0;
  font-size: clamp(17px, 1.8vw, 20px);
  line-height: 1.68;
  color: var(--text);
}

.page-about .about-quote__cite {
  display: block;
  margin-top: 14px;
  font-size: 12px;
  font-style: normal;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  margin-top: clamp(24px, 3vw, 38px);
  padding: 6px var(--gutter) 22px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-timeline__track {
  display: flex;
  gap: 16px;
  min-width: max-content;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline__item {
  position: relative;
  flex: 0 0 min(276px, 76vw);
  scroll-snap-align: start;
  padding: 22px 20px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--about-panel);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 20px;
  right: 20px;
  height: 2px;
  background: linear-gradient(90deg, var(--purple), transparent);
}

.page-about .about-timeline__item--now {
  border-color: var(--cyan);
  box-shadow: 0 0 0 1px rgba(37, 217, 232, 0.24), 0 18px 40px -28px rgba(37, 217, 232, 0.7);
}

.page-about .about-timeline__item--now::before {
  background: linear-gradient(90deg, var(--cyan), var(--purple));
}

.page-about .about-timeline__item:hover {
  transform: translateY(-4px);
  border-color: var(--purple-soft);
}

.page-about .about-timeline__ver {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .about-timeline__name {
  margin: 12px 0 0;
  font-size: 19px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-timeline__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 内容组织 ---------- */
.page-about .about-flow {
  padding: clamp(22px, 3vw, 32px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--about-panel);
}

.page-about .about-flow__title {
  margin: 0 0 20px;
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-flow__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 18px;
}

.page-about .about-flow__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: start;
  padding-bottom: 18px;
  border-bottom: 1px dashed var(--line-strong);
}

.page-about .about-flow__item:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-flow__step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: rgba(123, 77, 255, 0.18);
  border: 1px solid rgba(123, 77, 255, 0.5);
  color: var(--purple-soft);
  font-size: 12px;
}

.page-about .about-flow__name {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-flow__desc {
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}

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

.page-about .about-metrics__item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 20px 22px;
  background: var(--ink-900);
}

.page-about .about-metrics__num {
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-metrics__num sup {
  font-size: 0.5em;
  vertical-align: super;
}

.page-about .about-metrics__label {
  font-size: 15px;
  color: var(--text-soft);
}

.page-about .about-metrics__note {
  margin: 0;
  padding: 16px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(37, 217, 232, 0.06);
  color: var(--text-soft);
  line-height: 1.75;
}

/* ---------- 团队 ---------- */
.page-about .about-roles {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-roles__item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(19, 34, 71, 0.72);
  color: var(--text-soft);
  font-size: 15px;
}

.page-about .about-roles__dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(37, 217, 232, 0.16);
}

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  clip-path: polygon(0 0, 100% 4%, 100% 100%, 0 96%);
}

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

/* ---------- 合作与反馈 ---------- */
.page-about .about-partner__figure {
  margin: 0 0 clamp(28px, 4vw, 44px);
  max-width: 520px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

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

.page-about .about-partner__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-partner__card {
  background: var(--about-panel);
  border: 1px solid var(--line);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-partner__card:hover {
  transform: translateY(-4px);
  border-color: var(--purple-soft);
}

.page-about .about-partner__card .card__label {
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
}

.page-about .about-partner__note {
  margin-top: clamp(26px, 4vw, 40px);
  padding: clamp(22px, 3vw, 32px);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: linear-gradient(120deg, rgba(123, 77, 255, 0.14), rgba(255, 156, 74, 0.06));
}

.page-about .about-partner__note p {
  margin: 0;
  color: var(--text-soft);
  line-height: 1.8;
}

.page-about .about-partner__legend {
  margin-top: 18px;
}

/* ---------- 准则 ---------- */
.page-about .about-rules {
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-rules__item {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "idx name"
    "idx desc";
  gap: 4px 18px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(140deg, rgba(19, 34, 71, 0.9), rgba(11, 23, 48, 0.85));
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-rules__item:hover {
  border-color: var(--cyan);
  transform: translateY(-3px);
}

.page-about .about-rules__idx {
  grid-area: idx;
  font-size: 15px;
  color: var(--purple-soft);
  padding-top: 3px;
}

.page-about .about-rules__name {
  grid-area: name;
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-rules__desc {
  grid-area: desc;
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 收尾 ---------- */
.page-about .about-closing {
  padding-block: clamp(56px, 8vw, 104px);
}

.page-about .about-closing__inner {
  position: relative;
  text-align: left;
  max-width: 780px;
}

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

.page-about .about-closing__line {
  margin: 18px 0 0;
  font-size: clamp(24px, 3.4vw, 40px);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-closing__sub {
  margin: 18px 0 0;
  color: var(--muted);
  line-height: 1.8;
}

.page-about .about-closing__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-partner__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-metrics__item {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 62fr) minmax(0, 38fr);
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .about-chapter__body--split {
    grid-template-columns: minmax(0, 58fr) minmax(0, 42fr);
    align-items: start;
  }

  .page-about .about-chapter__body--reverse {
    grid-template-columns: minmax(0, 42fr) minmax(0, 58fr);
  }

  .page-about .about-chapter__body--reverse .about-chapter__col {
    order: 1;
  }

  .page-about .about-chapter__body--reverse .about-figure {
    order: 2;
  }

  .page-about .about-partner__figure {
    max-width: 460px;
    margin-left: auto;
    margin-right: 0;
  }

  .page-about .about-rules__item {
    grid-template-columns: auto minmax(0, 260px) minmax(0, 1fr);
    grid-template-areas: "idx name desc";
    align-items: baseline;
    gap: 0 22px;
  }

  .page-about .about-rules__desc {
    margin-top: 0;
  }
}

@media (min-width: 1100px) {
  .page-about .about-timeline {
    padding-inline: max(var(--gutter), calc((100vw - var(--shell)) / 2));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item,
  .page-about .about-partner__card,
  .page-about .about-rules__item,
  .page-about .about-quote__summary::after {
    transition: none;
  }

  .page-about .about-timeline__item:hover,
  .page-about .about-partner__card:hover,
  .page-about .about-rules__item:hover {
    transform: none;
  }
}