.page-about {
  --about-axis-w: 190px;
  --about-ink: #16211D;
  --about-paper-line: rgba(11, 31, 26, 0.18);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(1.5rem, 4vw, 2.75rem) 0 clamp(1.75rem, 4.5vw, 3rem);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(115% 85% at 92% 0%, rgba(61, 224, 176, 0.10), transparent 62%),
    radial-gradient(85% 65% at 0% 105%, rgba(255, 138, 61, 0.09), transparent 60%);
}

.page-about .about-hero h1 {
  margin: 0.75rem 0 0;
  max-width: 20ch;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(1.9rem, 5.6vw, 3.4rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--paper-2);
}

.page-about .about-hero .lede {
  margin: clamp(1rem, 2.5vw, 1.5rem) 0 0;
  max-width: 64ch;
  font-family: var(--font-serif);
  font-size: clamp(1rem, 1.45vw, 1.125rem);
  line-height: 1.9;
  color: var(--text);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 900px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-stats > div {
  padding: clamp(0.85rem, 2.2vw, 1.25rem) clamp(0.9rem, 2.4vw, 1.35rem);
  background: linear-gradient(180deg, rgba(20, 33, 30, 0.92), rgba(16, 20, 19, 0.94));
}

.page-about .about-stats dt {
  margin: 0;
}

.page-about .about-stats dd {
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
  margin: 0.4rem 0 0;
}

.page-about .about-stats .data-figure--xl {
  font-family: var(--font-cond);
  font-size: clamp(1.9rem, 6vw, 3rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--accent);
}

.page-about .about-stats > div:nth-child(2) .data-figure--xl {
  color: var(--paper);
}

.page-about .about-stats > div:nth-child(3) .data-figure--xl {
  color: var(--amber);
}

.page-about .about-stats > div:nth-child(4) .data-figure--xl {
  color: var(--cool);
}

.page-about .about-stats .unit {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
}

/* ---------- 通用章节 ---------- */
.page-about .section {
  padding-block: clamp(2.25rem, 5vw, 4rem);
}

.page-about .about-h2 {
  margin: 0 0 clamp(0.75rem, 2vw, 1.1rem);
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(1.4rem, 3.4vw, 2.15rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--paper-2);
}

.page-about .section-head {
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-body {
  max-width: 70ch;
}

.page-about .about-body p {
  margin: 0 0 1.05em;
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  line-height: 1.9;
  color: var(--text);
}

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

.page-about .about-figure {
  margin: clamp(1.5rem, 3.5vw, 2.25rem) 0 0;
}

/* ---------- 起点：双栏 + 贴边年份轴 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 3.5vw, 2.5rem);
  align-items: start;
}

.page-about .about-axis {
  padding-left: 0.9rem;
  border-left: 2px solid var(--accent);
}

.page-about .about-axis__mark {
  margin: 0;
  font-family: var(--font-cond);
  font-size: clamp(1.6rem, 4vw, 2.1rem);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .about-axis__mark span {
  color: var(--accent);
}

.page-about .about-axis__ticks {
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-axis__ticks li {
  padding: 0.5rem 0;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.page-about .about-axis__ticks .num {
  margin-right: 0.5rem;
  color: var(--paper);
}

.page-about .about-axis__note {
  margin: 1.1rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.7;
  color: var(--muted);
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: var(--about-axis-w) minmax(0, 1fr);
    gap: clamp(2rem, 4.5vw, 4rem);
  }

  .page-about .about-axis {
    position: sticky;
    top: 6.5rem;
  }
}

/* ---------- 服务对象卡片：非对称拼贴 ---------- */
.page-about .about-audience-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap);
}

.page-about .about-card {
  position: relative;
  padding: clamp(1.1rem, 2.6vw, 1.6rem);
  background: linear-gradient(180deg, rgba(20, 33, 30, 0.9), rgba(16, 20, 19, 0.92));
  border: 1px solid var(--line);
  transition: border-color var(--dur) ease, transform var(--dur) ease;
}

.page-about .about-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 42px;
  height: 2px;
  background: var(--accent);
}

.page-about .about-card:nth-child(2)::before {
  background: var(--cool);
}

.page-about .about-card:nth-child(3)::before {
  background: var(--warm);
}

.page-about .about-card:nth-child(4)::before {
  background: var(--amber);
}

.page-about .about-card:hover,
.page-about .about-card:focus-within {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.page-about .about-card__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-card__title {
  margin: 0.5rem 0 0.6rem;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.125rem;
  line-height: 1.4;
  color: var(--paper-2);
}

.page-about .about-card p:last-child {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--text);
}

@media (min-width: 760px) {
  .page-about .about-audience-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .about-audience-grid > :nth-child(1) {
    grid-column: 1 / span 7;
  }

  .page-about .about-audience-grid > :nth-child(2) {
    grid-column: 8 / span 5;
  }

  .page-about .about-audience-grid > :nth-child(3) {
    grid-column: 1 / span 5;
  }

  .page-about .about-audience-grid > :nth-child(4) {
    grid-column: 6 / span 7;
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-bottom: clamp(1.5rem, 3.5vw, 2.25rem);
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 900px) {
  .page-about .about-team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-team-cell {
  padding: clamp(1rem, 2.6vw, 1.5rem);
  background: rgba(20, 33, 30, 0.7);
}

.page-about .about-team-cell .data-figure--xl {
  display: block;
  font-family: var(--font-cond);
  font-size: clamp(2rem, 6.5vw, 3.25rem);
  font-weight: 700;
  line-height: 1;
  color: var(--paper-2);
}

.page-about .about-team-cell__label {
  margin: 0.6rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-team-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 3.5vw, 2.5rem);
  align-items: start;
}

@media (min-width: 900px) {
  .page-about .about-team-body {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }
}

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

.page-about .about-details {
  margin-top: clamp(1.5rem, 3.5vw, 2.25rem);
  padding: clamp(1rem, 2.6vw, 1.5rem);
  border: 1px solid var(--line);
  background: rgba(20, 33, 30, 0.55);
}

.page-about .about-groups {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(0.9rem, 2.4vw, 1.5rem);
  margin-top: clamp(1rem, 2.6vw, 1.5rem);
}

@media (min-width: 820px) {
  .page-about .about-groups {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-group {
  padding-top: 0.9rem;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-group__name {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--accent);
}

.page-about .about-group p:last-child {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--text);
}

/* ---------- 发展历程纸带 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: clamp(2rem, 5vw, 4rem) 0;
  padding: clamp(1.75rem, 5vw, 3.25rem) 0 clamp(2rem, 5vw, 3.5rem);
  background: linear-gradient(180deg, var(--paper-2) 0%, var(--paper) 62%, #CFC7B6 100%);
  color: var(--about-ink);
  border-top: 1px solid var(--about-paper-line);
  border-bottom: 1px solid var(--about-paper-line);
}

.page-about .about-timeline__ruler {
  height: 14px;
  margin-bottom: clamp(1rem, 2.6vw, 1.6rem);
  background-image: repeating-linear-gradient(
    90deg,
    rgba(11, 31, 26, 0.45) 0 1px,
    transparent 1px 22px
  );
  border-bottom: 1px solid var(--about-paper-line);
}

.page-about .about-timeline .micro-tag {
  color: rgba(11, 31, 26, 0.62);
  border-color: rgba(11, 31, 26, 0.3);
}

.page-about .about-timeline .about-h2 {
  color: var(--about-ink);
}

.page-about .about-timeline__figure {
  margin: 0 0 clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-timeline__figure .media-frame__caption {
  color: rgba(11, 31, 26, 0.68);
}

.page-about .about-years {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--about-paper-line);
  border: 1px solid var(--about-paper-line);
}

@media (min-width: 820px) {
  .page-about .about-years {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-year {
  display: block;
  height: 100%;
  padding: clamp(1rem, 2.4vw, 1.4rem);
  background: var(--paper-2);
  color: inherit;
  text-decoration: none;
  transition: background var(--dur) ease, color var(--dur) ease;
}

.page-about .about-year:hover,
.page-about .about-year:focus-visible {
  background: var(--ink-900);
  color: var(--paper-2);
  outline: none;
}

.page-about .about-year__num {
  display: block;
  font-family: var(--font-cond);
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.01em;
}

.page-about .about-year__title {
  display: block;
  margin-top: 0.5rem;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.9375rem;
}

.page-about .about-year__desc {
  display: block;
  margin-top: 0.4rem;
  font-family: var(--font-serif);
  font-size: 0.8125rem;
  line-height: 1.7;
  opacity: 0.78;
}

.page-about .about-nodes {
  margin-top: clamp(1.5rem, 3.5vw, 2.25rem);
  border-top: 1px solid var(--about-paper-line);
}

.page-about .about-node {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.5rem;
  padding: clamp(1rem, 2.6vw, 1.4rem) clamp(0.5rem, 1.6vw, 1rem);
  border-bottom: 1px solid var(--about-paper-line);
  scroll-margin-top: 7rem;
  transition: background var(--dur) ease;
}

.page-about .about-node:target {
  background: rgba(61, 224, 176, 0.18);
}

@media (min-width: 820px) {
  .page-about .about-node {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 1.75rem;
    align-items: start;
  }
}

.page-about .about-node__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: rgba(11, 31, 26, 0.62);
}

.page-about .about-node h3 {
  margin: 0 0 0.45rem;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.0625rem;
  color: var(--about-ink);
}

.page-about .about-node p:last-child {
  margin: 0;
  max-width: 68ch;
  font-family: var(--font-serif);
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(11, 31, 26, 0.86);
}

/* ---------- 数据来源 ---------- */
.page-about .about-source-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 3.5vw, 2.75rem);
  align-items: start;
}

@media (min-width: 900px) {
  .page-about .about-source-layout {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  }
}

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

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

.page-about .about-step {
  padding: clamp(1rem, 2.4vw, 1.35rem);
  background: rgba(16, 20, 19, 0.75);
}

.page-about .about-step__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--accent);
}

.page-about .about-step h3 {
  margin: 0.55rem 0 0.45rem;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1rem;
  color: var(--paper-2);
}

.page-about .about-step p:last-child {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--text);
}

/* ---------- 能力概览 ---------- */
.page-about .about-abilities {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap);
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 700px) {
  .page-about .about-abilities {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-abilities {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-ability {
  padding: clamp(0.95rem, 2.4vw, 1.25rem);
  background: rgba(20, 33, 30, 0.6);
  border: 1px solid var(--line);
  transition: border-color var(--dur) ease, background var(--dur) ease;
}

.page-about .about-ability:hover,
.page-about .about-ability:focus-within {
  border-color: var(--line-strong);
  background: rgba(20, 33, 30, 0.85);
}

.page-about .about-ability:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.page-about .about-ability__label {
  display: block;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1rem;
  color: var(--paper-2);
}

.page-about .about-ability__note {
  display: block;
  max-height: 0;
  margin-top: 0;
  overflow: hidden;
  opacity: 0;
  font-family: var(--font-serif);
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--text);
  transition: max-height var(--dur) ease, opacity var(--dur) ease, margin-top var(--dur) ease;
}

.page-about .about-ability:hover .about-ability__note,
.page-about .about-ability:focus-within .about-ability__note {
  max-height: 10rem;
  margin-top: 0.6rem;
  opacity: 1;
}

@media (hover: none) {
  .page-about .about-ability__note {
    max-height: none;
    margin-top: 0.6rem;
    opacity: 1;
  }
}

/* ---------- 收束 CTA ---------- */
.page-about .about-cta {
  padding-bottom: clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-cta__inner {
  padding: clamp(1.5rem, 4vw, 2.75rem);
  border: 1px solid var(--line);
  background:
    radial-gradient(100% 120% at 100% 0%, rgba(61, 224, 176, 0.12), transparent 60%),
    linear-gradient(180deg, rgba(20, 33, 30, 0.9), rgba(16, 20, 19, 0.95));
}

.page-about .about-cta .about-h2 {
  margin-bottom: 0.65rem;
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 62ch;
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: clamp(1.25rem, 3vw, 1.75rem);
}

/* ---------- 窄屏保护 ---------- */
@media (max-width: 520px) {
  .page-about .about-hero h1 {
    font-size: clamp(1.7rem, 8vw, 2.2rem);
    max-width: none;
  }

  .page-about .about-stats dd {
    flex-wrap: wrap;
    gap: 0.25rem;
  }

  .page-about .about-year__num {
    font-size: 1.6rem;
  }

  .page-about .about-cta__actions .btn {
    flex: 1 1 auto;
    text-align: center;
  }
}

.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}