.page-about {
  --about-panel-r: 16px;
  padding-bottom: 64px;
}

.page-about .breadcrumb {
  margin: 22px 0 6px;
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  padding: 12px 0 8px;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-hero__intro .eyebrow {
  margin: 0 0 12px;
  color: var(--orange-deep);
  letter-spacing: 0.14em;
}

.page-about .about-hero__intro h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(33px, 8.4vw, 62px);
  line-height: 1.02;
  letter-spacing: -0.012em;
  margin: 0 0 18px;
  color: var(--text);
}

.page-about .about-hero__intro .lead {
  font-family: var(--font-editorial);
  font-size: clamp(17px, 4.2vw, 21px);
  line-height: 1.72;
  color: var(--ink-text);
  margin: 0 0 14px;
}

.page-about .about-hero__intro p {
  margin: 0 0 12px;
  line-height: 1.78;
  color: var(--ink-text);
}

.page-about .about-hero__actions {
  margin-top: 20px;
}

.page-about .about-hero__panel {
  background: var(--ink-900);
  border-radius: var(--radius-l);
  padding: 26px 22px 24px;
  box-shadow: var(--shadow-card);
}

.page-about .about-hero__panel-label {
  margin: 0 0 16px;
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-toc {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  counter-reset: none;
}

.page-about .about-toc li + li {
  border-top: 1px solid var(--line-dark);
}

.page-about .about-toc__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 2px;
  text-decoration: none;
  color: var(--paper);
  font-size: var(--fs-16);
  line-height: 1.5;
  transition: color 0.2s var(--ease-out), padding-left 0.2s var(--ease-out);
}

.page-about .about-toc__link .mono {
  color: var(--slate-lift);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  flex: none;
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--cyan);
  padding-left: 8px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-dark);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-stat {
  background: var(--ink-800);
  padding: 15px 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .about-stat__num {
  font-size: var(--fs-24);
  font-weight: 500;
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .about-stat__label {
  font-size: var(--fs-12);
  color: var(--slate-lift);
  letter-spacing: 0.04em;
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding: 54px 0 0;
}

.page-about .section-head {
  display: block;
  margin: 0 0 26px;
  max-width: 62ch;
}

.page-about .section-head__index {
  display: block;
  margin: 0 0 10px;
  font-size: var(--fs-12);
  letter-spacing: 0.22em;
  color: var(--orange-deep);
}

.page-about .section-head__index::after {
  content: "";
  display: block;
  width: 46px;
  height: 2px;
  margin-top: 10px;
  background: linear-gradient(90deg, var(--orange), var(--amber), var(--cyan));
  border-radius: 2px;
}

.page-about .section-head__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(25px, 5.6vw, 40px);
  line-height: 1.12;
  letter-spacing: -0.008em;
  margin: 0 0 12px;
  color: var(--text);
}

.page-about .section-head__lead {
  margin: 0;
  font-family: var(--font-editorial);
  font-size: var(--fs-16);
  line-height: 1.76;
  color: var(--slate);
}

.page-about .about-body {
  max-width: 68ch;
}

.page-about .about-body p {
  margin: 0 0 18px;
  font-size: var(--fs-18);
  line-height: 1.8;
  color: var(--ink-text);
}

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

/* ---------- 三类栏目 ---------- */
.page-about .about-lines__figure {
  margin: 0 0 26px;
}

.page-about .about-lines__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .line-card {
  position: relative;
  display: block;
  text-decoration: none;
  padding: 22px 20px 20px 24px;
  border-radius: var(--radius-l);
  background: var(--paper-2);
  border: 1px solid var(--line);
  overflow: hidden;
  transition: transform 0.24s var(--ease-out), border-color 0.24s var(--ease-out);
}

.page-about .line-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
}

.page-about .line-card--notice::before {
  background: var(--amber);
}

.page-about .line-card--download::before {
  background: var(--cyan);
}

.page-about .line-card--feedback::before {
  background: var(--brick);
}

.page-about .line-card:hover,
.page-about .line-card:focus-visible {
  transform: translateY(-3px);
  border-color: var(--slate-lift);
}

.page-about .line-card__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-24);
  line-height: 1.2;
  margin: 14px 0 10px;
  color: var(--text);
}

.page-about .line-card__body {
  margin: 0 0 16px;
  font-size: var(--fs-16);
  line-height: 1.76;
  color: var(--ink-text);
}

.page-about .line-card__more {
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--cyan-deep);
}

.page-about .line-card--notice .line-card__more {
  color: var(--amber-deep);
}

.page-about .line-card--feedback .line-card__more {
  color: var(--brick);
}

/* ---------- 五步流程 ---------- */
.page-about .about-pipeline__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: none;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 44px 1fr;
  grid-template-areas:
    "no title"
    "no body";
  column-gap: 14px;
  padding: 18px 0;
  border-top: 1px dashed var(--line);
}

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

.page-about .about-step__no {
  grid-area: no;
  font-size: var(--fs-14);
  font-weight: 500;
  color: var(--orange-deep);
  letter-spacing: 0.08em;
  padding-top: 3px;
}

.page-about .about-step__title {
  grid-area: title;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-24);
  line-height: 1.2;
  margin: 0 0 8px;
  color: var(--text);
}

.page-about .about-step__body {
  grid-area: body;
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.78;
  color: var(--ink-text);
}

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

/* ---------- 更新节奏 ---------- */
.page-about .about-scale__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .scale-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 20px;
  border-radius: var(--radius-m);
  background: var(--ink-900);
  color: var(--paper);
}

.page-about .scale-item__num {
  font-size: clamp(28px, 7vw, 38px);
  font-weight: 500;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-about .scale-item__label {
  font-size: var(--fs-16);
  font-weight: 500;
  color: var(--paper);
}

.page-about .scale-item__note {
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--slate-lift);
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .team-card {
  padding: 24px 22px 22px;
  border-radius: var(--radius-l);
  background: var(--paper-2);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
}

.page-about .team-card__role {
  display: inline-block;
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  color: var(--slate);
  padding-bottom: 8px;
  border-bottom: 2px solid var(--amber);
}

.page-about .team-card__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-24);
  line-height: 1.22;
  margin: 14px 0 10px;
  color: var(--text);
}

.page-about .team-card__body {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.78;
  color: var(--ink-text);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 6px 0 6px 30px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 12px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--amber), var(--cyan) 55%, var(--brick));
}

.page-about .timeline-node {
  position: relative;
  padding: 0 0 34px;
}

.page-about .timeline-node:last-child {
  padding-bottom: 6px;
}

.page-about .timeline-node__dot {
  position: absolute;
  left: -30px;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 3px solid var(--paper);
  box-shadow: 0 0 0 1px var(--line);
}

.page-about .timeline-node__dot--a {
  background: var(--amber);
}

.page-about .timeline-node__dot--b {
  background: var(--cyan);
}

.page-about .timeline-node__dot--c {
  background: var(--brick);
}

.page-about .timeline-node__period {
  margin: 0 0 8px;
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--slate);
}

.page-about .timeline-node__title {
  font-family: var(--font-editorial);
  font-weight: 600;
  font-size: var(--fs-24);
  line-height: 1.42;
  margin: 0 0 10px;
  color: var(--text);
}

.page-about .timeline-node__body {
  margin: 0;
  max-width: 62ch;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--ink-text);
}

.page-about .about-history__figure {
  margin: 30px 0 0;
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding-top: 58px;
}

.page-about .about-cta__inner {
  position: relative;
  padding: 32px 24px 30px;
  border-radius: var(--radius-l);
  background: var(--ink-800);
  color: var(--paper);
  overflow: hidden;
}

.page-about .about-cta__inner::after {
  content: "";
  position: absolute;
  right: -60px;
  top: -70px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, rgba(53, 214, 200, 0.28), rgba(53, 214, 200, 0) 68%);
  pointer-events: none;
}

.page-about .about-cta__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 5.4vw, 34px);
  line-height: 1.16;
  margin: 0 0 14px;
  color: var(--paper);
}

.page-about .about-cta__body {
  margin: 0 0 22px;
  max-width: 60ch;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: rgba(244, 237, 225, 0.84);
}

.page-about .about-cta__links {
  position: relative;
  z-index: 1;
}

/* ---------- 图片通用 ---------- */
.page-about .media__frame {
  border-radius: var(--radius-l);
  overflow: hidden;
  background: linear-gradient(135deg, var(--ink-800), var(--ink-600));
}

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

.page-about .media__caption {
  margin-top: 10px;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 平板 ---------- */
@media (min-width: 700px) {
  .page-about {
    --about-panel-r: 24px;
  }

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

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

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

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

  .page-about .about-cta__inner {
    padding: 40px 36px 38px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1000px) {
  .page-about {
    padding-bottom: 88px;
  }

  .page-about .about-hero {
    padding-top: 24px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    gap: 52px;
    align-items: start;
  }

  .page-about .about-hero__panel {
    position: sticky;
    top: 96px;
    padding: 30px 26px 28px;
  }

  .page-about .about-section {
    padding-top: 78px;
  }

  .page-about .about-lines__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .about-pipeline__grid {
    grid-template-columns: 8fr 4fr;
    gap: 46px;
    align-items: start;
  }

  .page-about .about-pipeline__figure {
    position: sticky;
    top: 96px;
  }

  .page-about .about-scale__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

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

  .page-about .about-timeline {
    padding-left: 36px;
  }

  .page-about .about-timeline::before {
    left: 9px;
  }

  .page-about .timeline-node__dot {
    left: -36px;
    width: 20px;
    height: 20px;
  }

  .page-about .about-cta__inner {
    display: grid;
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "title links"
      "body links";
    align-items: center;
    column-gap: 40px;
    padding: 46px 48px 44px;
  }

  .page-about .about-cta__title {
    grid-area: title;
  }

  .page-about .about-cta__body {
    grid-area: body;
    margin-bottom: 0;
  }

  .page-about .about-cta__links {
    grid-area: links;
    margin: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .line-card,
  .page-about .about-toc__link {
    transition: none;
  }
}