.page-about {
  --story-line: rgba(15, 45, 74, .12);
  --story-gold: #F4A261;
  position: relative;
  overflow-x: clip;
}

/* ============ 封面首屏 ============ */
.page-about .story-hero {
  position: relative;
  padding-top: 24px;
}

.page-about .story-hero::before {
  content: "";
  position: absolute;
  top: -70px;
  right: -90px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 107, 44, .18), transparent 62%);
  pointer-events: none;
}

.page-about .story-hero::after {
  content: "";
  position: absolute;
  left: 18%;
  bottom: 72px;
  width: 38%;
  height: 2px;
  background: linear-gradient(90deg, var(--clr-accent), var(--clr-neon));
  transform: rotate(-2deg);
  border-radius: var(--radius-pill);
  opacity: .55;
  pointer-events: none;
}

.page-about .breadcrumbs {
  margin-bottom: 34px;
}

.page-about .story-hero__grid {
  display: grid;
  gap: 28px;
}

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

.page-about .story-hero__lead {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--clr-muted);
  max-width: 700px;
  margin: 22px 0 0;
}

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

.page-about .story-hero__index {
  background: var(--clr-primary);
  color: var(--clr-bg-light);
  border-radius: var(--radius-lg);
  padding: 30px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  box-shadow: var(--shadow-float);
  position: relative;
  overflow: hidden;
}

.page-about .story-hero__index::after {
  content: "ABOUT";
  position: absolute;
  right: -28px;
  bottom: -38px;
  font-family: var(--font-mono);
  font-size: 5.2rem;
  font-weight: 800;
  letter-spacing: -.06em;
  color: rgba(255, 253, 247, .06);
  line-height: 1;
  pointer-events: none;
}

.page-about .story-contents {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .story-contents a {
  display: flex;
  align-items: center;
  gap: 14px;
  color: inherit;
  text-decoration: none;
  padding: 12px 4px;
  border-bottom: 1px solid rgba(255, 253, 247, .16);
  font-weight: 500;
  font-size: .98rem;
  transition: padding-left .25s ease, color .25s ease;
}

.page-about .story-contents a:hover {
  color: var(--clr-accent);
  padding-left: 10px;
}

.page-about .story-contents__num {
  font-family: var(--font-mono);
  font-size: .86rem;
  font-weight: 700;
  color: var(--clr-accent);
}

.page-about .story-hero__status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .84rem;
  color: rgba(255, 253, 247, .78);
  margin-top: auto;
}

.page-about .hero-metrics {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .hero-metrics__item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  min-width: 0;
}

.page-about .hero-metrics__label {
  font-size: .9rem;
  color: var(--clr-muted);
  letter-spacing: .04em;
}

/* ============ 品牌起源 ============ */
.page-about .story-origin {
  padding-block: 40px 28px;
}

.page-about .story-origin__grid {
  display: grid;
  gap: 32px;
}

.page-about .story-origin__copy h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  line-height: 1.25;
  letter-spacing: -.02em;
  margin: 8px 0 18px;
}

.page-about .story-origin__copy p {
  color: var(--clr-muted);
  line-height: 1.78;
  margin-bottom: 16px;
}

.page-about .story-origin__copy a {
  color: var(--clr-primary);
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: var(--clr-accent);
  text-underline-offset: 4px;
  text-decoration-thickness: 2px;
}

.page-about .story-origin__media {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 18px;
}

.page-about .story-origin__img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
}

.page-about .story-origin__note {
  background: var(--story-gold);
  border-radius: var(--radius-md);
  padding: 18px 22px;
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--clr-primary);
  transform: rotate(-1.5deg);
  box-shadow: var(--shadow-soft);
}

.page-about .story-origin__note p {
  margin: 0;
  font-size: .9rem;
  font-weight: 500;
  line-height: 1.4;
}

.page-about .origin-facts {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .origin-facts .stat {
  display: block;
  font-size: 1.6rem;
}

.page-about .origin-facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: .92rem;
  color: var(--clr-muted);
  min-width: 0;
}

/* ============ 里程碑时间轴 ============ */
.page-about .story-timeline {
  padding-block: 40px;
}

.page-about .section-head {
  margin-bottom: 28px;
}

.page-about .section-head h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  letter-spacing: -.02em;
  margin: 8px 0 10px;
}

.page-about .section-head__desc {
  color: var(--clr-muted);
  font-size: .98rem;
  max-width: 520px;
  line-height: 1.6;
}

.page-about .timeline-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 34px;
}

.page-about .timeline-wrap {
  position: relative;
}

.page-about .timeline-svg-wrap {
  display: none;
}

.page-about .timeline-list {
  position: relative;
  display: grid;
  gap: 20px;
  z-index: 1;
}

.page-about .timeline-list::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 16px;
  width: 2px;
  background: linear-gradient(to bottom, var(--clr-primary), var(--clr-accent) 55%, var(--clr-neon));
  border-radius: var(--radius-pill);
}

.page-about .timeline-item {
  margin-left: 52px;
  transition: transform .25s ease, box-shadow .25s ease;
}

.page-about .timeline-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-float);
}

.page-about .timeline-item::after {
  content: "";
  position: absolute;
  top: 30px;
  left: -36px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--clr-accent);
  border: 4px solid var(--clr-bg);
  transform: translateX(-50%);
  z-index: 2;
}

.page-about .timeline-item__marker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.page-about .timeline-item__year {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--clr-primary);
}

.page-about .timeline-item h3 {
  font-size: 1.12rem;
  margin: 0 0 6px;
}

.page-about .timeline-item p {
  margin: 0;
  font-size: .94rem;
  line-height: 1.68;
  color: var(--clr-muted);
}

.page-about .timeline-empty {
  display: none;
  margin-top: 20px;
  text-align: center;
  color: var(--clr-muted);
}

.page-about .timeline-banner {
  margin-top: 32px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: grid;
  gap: 0;
}

.page-about .timeline-banner__img {
  width: 100%;
  height: auto;
  max-height: 320px;
  object-fit: cover;
  display: block;
}

.page-about .timeline-banner__text {
  padding: 28px;
}

.page-about .timeline-banner__text h3 {
  font-size: 1.4rem;
  letter-spacing: -.02em;
  margin: 8px 0 10px;
}

.page-about .timeline-banner__text p {
  color: var(--clr-muted);
  line-height: 1.75;
  margin-bottom: 20px;
}

/* ============ 数据理念 ============ */
.page-about .story-philosophy {
  padding-block: 40px;
}

.page-about .philosophy-grid {
  display: grid;
  gap: 36px;
}

.page-about .philosophy-head h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  letter-spacing: -.02em;
  margin: 8px 0 16px;
}

.page-about .philosophy-head > p {
  color: var(--clr-muted);
  line-height: 1.78;
  margin-bottom: 14px;
}

.page-about .mode-switch {
  position: relative;
  margin-top: 26px;
}

.page-about .mode-switch > input[type="radio"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.page-about .mode-switch__bar {
  display: inline-flex;
  gap: 6px;
  padding: 6px;
  background: var(--clr-bg);
  border: 1px solid var(--story-line);
  border-radius: var(--radius-pill);
}

.page-about .mode-switch__bar label {
  padding: 9px 22px;
  border-radius: var(--radius-pill);
  font-size: .92rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--clr-ink);
  transition: background .25s ease, color .25s ease;
  user-select: none;
}

.page-about .mode-switch__bar label:hover {
  background: rgba(255, 107, 44, .12);
}

.page-about .mode-switch > input[id="mode-full"]:checked ~ .mode-switch__bar label[for="mode-full"],
.page-about .mode-switch > input[id="mode-live"]:checked ~ .mode-switch__bar label[for="mode-live"] {
  background: var(--clr-accent);
  color: #fff;
}

.page-about .mode-switch > input:focus-visible ~ .mode-switch__bar label {
  outline: 3px solid var(--clr-accent);
  outline-offset: 2px;
}

.page-about .mode-switch__panel {
  display: grid;
  gap: 16px;
  margin-top: 18px;
}

.page-about .mode-switch__panel--live {
  display: none;
}

.page-about .mode-switch > input[id="mode-live"]:checked ~ .mode-switch__panel--full {
  display: none;
}

.page-about .mode-switch > input[id="mode-live"]:checked ~ .mode-switch__panel--live {
  display: grid;
}

.page-about .philosophy-card .stat {
  display: block;
  font-size: 2rem;
  margin-bottom: 8px;
}

.page-about .philosophy-card h3 {
  font-size: 1.05rem;
  margin: 0 0 6px;
}

.page-about .philosophy-card p {
  margin: 0;
  color: var(--clr-muted);
  font-size: .9rem;
  line-height: 1.6;
}

.page-about .philosophy-visual {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-about .growth-chart {
  padding: 24px;
  border-radius: var(--radius-lg);
}

.page-about .growth-chart__svg {
  display: block;
  width: 100%;
  height: auto;
  margin-top: 16px;
}

.page-about .growth-chart__legend {
  display: flex;
  gap: 8px;
  margin-top: 14px;
  flex-wrap: wrap;
}

.page-about .philosophy-note {
  background: var(--clr-primary);
  color: var(--clr-bg-light);
  border-radius: var(--radius-lg);
  padding: 26px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .philosophy-note p {
  margin: 0;
  color: rgba(255, 253, 247, .78);
  line-height: 1.65;
  font-size: .95rem;
}

/* ============ 服务承诺 ============ */
.page-about .story-commit {
  padding-block: 40px;
}

.page-about .commit-grid {
  display: grid;
  gap: 18px;
  margin-top: 30px;
}

.page-about .commit-card {
  padding: 28px;
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  min-height: 230px;
  display: flex;
  flex-direction: column;
}

.page-about .commit-card:nth-child(1) {
  background: var(--clr-primary);
  color: var(--clr-bg-light);
}

.page-about .commit-card:nth-child(2) {
  background: var(--clr-bg-light);
  color: var(--clr-ink);
}

.page-about .commit-card:nth-child(3) {
  background: linear-gradient(135deg, #FBF0E4, #FFFDF7);
  color: var(--clr-ink);
}

.page-about .commit-card:nth-child(4) {
  background: var(--clr-bg-light);
  color: var(--clr-ink);
}

.page-about .commit-card__num {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 800;
  line-height: 1;
  color: var(--clr-accent);
  margin-bottom: auto;
}

.page-about .commit-card h3 {
  font-size: 1.12rem;
  margin: 18px 0 8px;
}

.page-about .commit-card p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.65;
  color: inherit;
  opacity: .8;
}

.page-about .commit-support {
  background: var(--clr-primary);
  color: var(--clr-bg-light);
  border-radius: var(--radius-lg);
  margin-top: 30px;
  padding: 28px;
  display: grid;
  gap: 28px;
  box-shadow: var(--shadow-float);
}

.page-about .commit-support__text h3 {
  font-size: 1.5rem;
  letter-spacing: -.02em;
  margin: 10px 0 14px;
}

.page-about .commit-support__text p {
  margin: 0 0 22px;
  color: rgba(255, 253, 247, .78);
  line-height: 1.7;
}

.page-about .commit-support__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .commit-support__media {
  display: grid;
  gap: 16px;
}

.page-about .commit-support__img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  display: block;
}

.page-about .commit-support__meta {
  display: grid;
  gap: 10px;
  background: rgba(255, 253, 247, .08);
  border-radius: var(--radius-md);
  padding: 18px 20px;
}

.page-about .commit-support__meta p {
  margin: 0;
  font-size: .94rem;
  line-height: 1.5;
}

.page-about .eyebrow--on-dark {
  color: rgba(255, 253, 247, .72);
}

.page-about .commit-trust {
  margin-top: 20px;
  text-align: center;
  color: var(--clr-muted);
  font-size: .88rem;
  line-height: 1.6;
}

/* ============ 响应式与动效 ============ */
@keyframes storyDashFlow {
  to {
    stroke-dashoffset: -800;
  }
}

.page-about .timeline-curve__path {
  animation: storyDashFlow 48s linear infinite;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline-curve__path {
    animation: none;
  }

  .page-about .timeline-item,
  .page-about .commit-card,
  .page-about .story-contents a {
    transition: none;
  }
}

@media (min-width: 720px) {
  .page-about .commit-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .philosophy-note {
    grid-row: span 2;
  }
}

@media (min-width: 900px) {
  .page-about .story-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, .72fr);
    gap: 48px;
    align-items: stretch;
  }

  .page-about .story-hero__lead {
    font-size: 1.18rem;
  }

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

  .page-about .story-origin__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 48px;
    align-items: center;
  }

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

  .page-about .philosophy-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .commit-support {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 40px;
    align-items: center;
  }

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

@media (min-width: 1000px) {
  .page-about .timeline-svg-wrap {
    display: block;
    position: absolute;
    inset: 0;
    pointer-events: none;
    opacity: .5;
  }

  .page-about .timeline-curve {
    width: 100%;
    height: 100%;
  }

  .page-about .timeline-list::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about .timeline-item {
    width: calc(50% - 56px);
    margin-left: 0;
    margin-right: auto;
  }

  .page-about .timeline-item:nth-child(even) {
    margin-left: auto;
    margin-right: 0;
  }

  .page-about .timeline-item::after {
    top: 32px;
    left: auto;
    right: -56px;
    transform: translateX(50%);
  }

  .page-about .timeline-item:nth-child(even)::after {
    right: auto;
    left: -56px;
    transform: translateX(-50%);
  }

  .page-about .timeline-item__marker {
    justify-content: flex-end;
  }

  .page-about .timeline-item:nth-child(even) .timeline-item__marker {
    justify-content: flex-start;
  }

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

  .page-about .timeline-banner__img {
    height: 100%;
    max-height: none;
  }

  .page-about .timeline-banner__text {
    padding: 40px;
  }
}

@media (min-width: 1100px) {
  .page-about .commit-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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