.page-about {
  background: var(--c-ink);
  color: var(--c-paper);
  overflow-x: hidden;
}

.page-about .about-hero {
  padding-block: clamp(26px, 6vw, 64px) clamp(30px, 5vw, 56px);
  border-bottom: 1px solid var(--line);
  background-image: repeating-linear-gradient(90deg, rgba(124, 154, 143, 0.09) 0 1px, transparent 1px 72px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.25rem, 8.6vw, 5.5rem);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--c-paper);
}

.page-about .about-hero__lead {
  max-width: 56ch;
  margin: clamp(18px, 3vw, 26px) 0 0;
  font-size: clamp(1rem, 0.5vw + 0.9rem, 1.125rem);
  line-height: 1.78;
  color: var(--c-mist);
}

.page-about .about-hero__meta {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line-strong);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
}

.page-about .about-meta__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.2rem, 3vw, 1.7rem);
  letter-spacing: 0.04em;
  color: var(--c-cyan);
}

.page-about .about-meta__label {
  display: block;
  margin-top: 6px;
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--c-rock);
}

.page-about .about-index-section {
  padding-block: clamp(34px, 6vw, 64px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-index__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-rock);
}

.page-about .about-index {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-index a {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 12px;
  padding: 14px 2px;
  text-decoration: none;
  color: var(--c-paper);
  transition: color 180ms ease;
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--c-cyan);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--c-rock);
}

.page-about .about-index__name {
  font-size: 1rem;
  line-height: 1.5;
}

.page-about .about-index__hint {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--c-rock);
}

.page-about .about-num {
  display: block;
  width: max-content;
  margin-bottom: -0.04em;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(62px, 13vw, 120px);
  line-height: 0.8;
  letter-spacing: -0.03em;
  color: rgba(47, 240, 206, 0.18);
  text-decoration: none;
  transition: color 180ms ease;
}

.page-about .about-num:hover,
.page-about .about-num:focus-visible {
  color: rgba(47, 240, 206, 0.42);
}

.page-about .about-h2 {
  margin: 8px 0 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.55rem, 4.2vw, 2.75rem);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--c-paper);
}

.page-about .about-lede {
  max-width: 56ch;
  margin: 14px 0 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--c-rock);
}

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

.page-about .about-figure__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--c-panel);
}

.page-about .about-figure__cap {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.6;
  letter-spacing: 0.04em;
}

/* 01 · 品牌自述 */
.page-about .about-story {
  padding-block: clamp(42px, 7vw, 88px);
  background: var(--c-paper);
  color: var(--c-print);
  background-image: repeating-linear-gradient(0deg, rgba(5, 10, 8, 0.04) 0 1px, transparent 1px 72px);
}

.page-about .about-story__inner {
  display: grid;
  gap: clamp(26px, 5vw, 56px);
}

.page-about .about-story .about-num {
  color: rgba(5, 10, 8, 0.14);
}

.page-about .about-story .about-num:hover,
.page-about .about-story .about-num:focus-visible {
  color: rgba(5, 10, 8, 0.32);
}

.page-about .about-story .eyebrow {
  color: #4b6357;
}

.page-about .about-story .about-h2 {
  color: var(--c-print);
}

.page-about .about-story .prose {
  margin-top: clamp(16px, 2.6vw, 24px);
  color: var(--c-print);
}

.page-about .about-story .prose p {
  max-width: 60ch;
  margin: 0 0 1em;
  font-size: clamp(0.9688rem, 0.35vw + 0.9rem, 1.0625rem);
  line-height: 1.82;
}

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

.page-about .about-story .prose a {
  color: #21604f;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-story .about-figure__img {
  border: 1px solid rgba(5, 10, 8, 0.22);
  box-shadow: 10px 10px 0 rgba(5, 10, 8, 0.12);
}

.page-about .about-story .about-figure__cap {
  color: #55695f;
}

/* 02 · 时间线 */
.page-about .about-timeline {
  padding-block: clamp(42px, 7vw, 88px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-timeline .about-lede {
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-rail {
  list-style: none;
  margin: 0;
  padding: 4px 0 0 24px;
  border-left: 1px solid var(--line-strong);
}

.page-about .about-node {
  position: relative;
  padding-bottom: clamp(24px, 4vw, 38px);
  outline: none;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 0.5em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-rock);
}

.page-about .about-node--done::before {
  background: var(--c-clay);
}

.page-about .about-node--live::before {
  background: var(--c-cyan);
  animation: about-pulse 2.4s ease-in-out infinite;
}

@keyframes about-pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(47, 240, 206, 0.14); }
  50% { box-shadow: 0 0 0 10px rgba(47, 240, 206, 0.04); }
}

.page-about .about-node__year {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  letter-spacing: 0.08em;
  color: var(--c-rock);
}

.page-about .about-node--live .about-node__year {
  color: var(--c-cyan);
}

.page-about .about-node__title {
  margin: 0;
  font-family: var(--font-body);
  font-size: clamp(1.0313rem, 1.6vw, 1.1875rem);
  font-weight: 700;
  line-height: 1.5;
  color: var(--c-paper);
}

.page-about .about-node__note {
  max-width: 58ch;
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: var(--c-mist);
  transition: max-height 280ms ease, opacity 280ms ease, margin-top 280ms ease;
}

.page-about .about-node:hover .about-node__note,
.page-about .about-node:focus-within .about-node__note,
.page-about .about-node:focus .about-node__note {
  max-height: 14em;
  opacity: 1;
  margin-top: 8px;
}

.page-about .about-rail__figure {
  position: relative;
  padding: 0 0 clamp(26px, 4vw, 40px);
}

.page-about .about-figure--rail .about-figure__img {
  max-width: 560px;
  border: 1px solid var(--line-strong);
  box-shadow: 10px 10px 0 rgba(5, 10, 8, 0.55);
}

.page-about .about-figure--rail .about-figure__cap {
  color: var(--c-rock);
}

/* 03 · 团队 */
.page-about .about-team {
  padding-block: clamp(42px, 7vw, 88px);
  background: var(--c-panel);
  border-bottom: 1px solid var(--line);
}

.page-about .about-team .about-h2 {
  color: var(--c-paper);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(26px, 4vw, 40px);
}

.page-about .about-team__card {
  padding-top: 16px;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-team__count {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.55rem, 3.4vw, 2.3rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--c-cyan);
}

.page-about .about-team__role {
  display: block;
  margin-top: 10px;
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  color: var(--c-rock);
}

.page-about .about-team__desc {
  margin: 10px 0 0;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: var(--c-paper);
}

.page-about .about-team__foot {
  max-width: 62ch;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--c-clay);
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--c-mist);
}

/* 04 · 流程 */
.page-about .about-flow {
  padding-block: clamp(42px, 7vw, 88px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-steps {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-step {
  padding: clamp(18px, 3vw, 26px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-step__time {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--c-mist);
}

.page-about .about-step__title {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--c-paper);
}

.page-about .about-step__text {
  max-width: 62ch;
  margin: 8px 0 0;
  font-size: 0.9375rem;
  line-height: 1.76;
  color: var(--c-rock);
}

.page-about .about-step__text a,
.page-about .about-providers__text a,
.page-about .about-rule a {
  color: var(--c-mist);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-step__text a:hover,
.page-about .about-providers__text a:hover,
.page-about .about-rule a:hover {
  color: var(--c-cyan);
}

/* 05 · 覆盖 */
.page-about .about-coverage {
  padding-block: clamp(42px, 7vw, 88px);
  border-bottom: 1px solid var(--line);
  background-image: repeating-linear-gradient(0deg, rgba(124, 154, 143, 0.07) 0 1px, transparent 1px 72px);
}

.page-about .about-cov-grid {
  display: grid;
  gap: 1px;
  margin-top: clamp(26px, 4vw, 40px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-cov {
  padding: clamp(20px, 3vw, 30px);
  background: var(--c-ink);
}

.page-about .about-cov__num {
  display: block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--c-amber);
}

.page-about .about-cov__title {
  margin: 8px 0 0;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--c-paper);
}

.page-about .about-cov__text {
  margin: 10px 0 0;
  font-size: 0.9375rem;
  line-height: 1.74;
  color: var(--c-rock);
}

.page-about .about-providers {
  display: grid;
  gap: 12px;
  margin-top: clamp(22px, 3.6vw, 34px);
}

.page-about .about-providers__text {
  max-width: 62ch;
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--c-mist);
}

/* 06 · 准则 */
.page-about .about-principles {
  padding-block: clamp(42px, 7vw, 88px);
}

.page-about .about-rules {
  list-style: none;
  display: grid;
  gap: clamp(20px, 3vw, 30px);
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
}

.page-about .about-rule {
  padding-left: clamp(14px, 2vw, 20px);
  border-left: 2px solid var(--c-cyan);
}

.page-about .about-rule__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--c-rock);
}

.page-about .about-rule h3 {
  margin: 8px 0 0;
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--c-paper);
}

.page-about .about-rule p {
  margin: 8px 0 0;
  font-size: 0.9375rem;
  line-height: 1.76;
  color: var(--c-rock);
}

/* 收束 */
.page-about .about-closing {
  border-top: 1px solid var(--line);
}

.page-about .about-closing__figure {
  margin: 0;
  border: 1px solid var(--line-strong);
}

.page-about .about-closing__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--c-panel);
}

.page-about .about-closing__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-block: clamp(26px, 5vw, 44px);
}

.page-about .about-closing__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.4rem, 3.4vw, 2.1rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--c-paper);
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node--live::before {
    animation: none;
  }
  .page-about .about-node__note {
    transition: none;
  }
}

@media (max-width: 859px) {
  .page-about .about-node__note {
    max-height: none;
    opacity: 1;
    margin-top: 8px;
  }
}

@media (min-width: 640px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-hero__meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-cov-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-index {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(28px, 5vw, 64px);
  }

  .page-about .about-story__inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-about .about-node {
    display: grid;
    grid-template-columns: 92px minmax(0, 1fr);
    gap: clamp(16px, 3vw, 36px);
  }

  .page-about .about-node__year {
    margin-bottom: 0;
    padding-top: 0.2em;
    text-align: right;
  }

  .page-about .about-rail__figure {
    display: grid;
    grid-template-columns: 92px minmax(0, 1fr);
    gap: clamp(16px, 3vw, 36px);
  }

  .page-about .about-rail__figure .about-figure {
    grid-column: 2;
  }

  .page-about .about-step {
    display: grid;
    grid-template-columns: 150px minmax(0, 1fr);
    gap: clamp(20px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-step__time {
    margin-bottom: 0;
    padding-top: 0.25em;
  }

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

@media (min-width: 960px) {
  .page-about .about-team__grid {
    grid-template-columns: 1.35fr 1fr 1fr 0.95fr;
  }
  .page-about .about-cov-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}