.page-about {
  --about-paper: #EFE8DA;
  --about-paper-2: #E0D6C2;
  --about-hair: rgba(139, 148, 139, 0.3);
  --about-soft: rgba(242, 237, 227, 0.76);
  --about-deep: #071612;
  padding-bottom: clamp(48px, 7vw, 96px);
  background:
    radial-gradient(900px 520px at 88% -6%, rgba(81, 227, 210, 0.12), transparent 62%),
    radial-gradient(720px 440px at 0% 20%, rgba(227, 168, 63, 0.08), transparent 66%),
    linear-gradient(180deg, #0A1F1A 0%, #0A1F1A 54%, #111514 100%);
  color: var(--cream);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(22px, 4vw, 56px) 0 clamp(34px, 5vw, 68px);
}
.page-about .about-hero__crumbs {
  margin-bottom: clamp(18px, 3vw, 34px);
}
.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 3.6vw, 48px);
}
.page-about .about-hero__kicker {
  margin: 0 0 14px;
  color: var(--cyan);
}
.page-about .about-hero__title {
  margin: 0;
  font-size: clamp(34px, 6vw, 78px);
  line-height: 1.03;
  letter-spacing: -0.03em;
  font-weight: 900;
  color: var(--cream);
}
.page-about .about-hero__title em {
  font-style: normal;
  color: var(--amber);
  display: inline-block;
}
.page-about .about-hero__dek {
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  max-width: 46ch;
  font-size: clamp(15.5px, 1.5vw, 17.5px);
  line-height: 1.95;
  color: var(--about-soft);
}
.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 18px 0 0;
  border-top: 2px solid var(--about-hair);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}
.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}
.page-about .about-hero__facts b {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 30px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--amber);
}
.page-about .about-hero__facts span {
  font-size: 11.5px;
  line-height: 1.5;
  color: var(--rock);
}
.page-about .about-hero__media {
  margin: 0;
}
.page-about .about-hero__media .media {
  border: 2px solid var(--about-hair);
  box-shadow: var(--shadow-hard);
}
.page-about .about-hero__cap,
.page-about .about-tl__cap {
  margin: 12px 0 0;
  color: var(--rock);
  line-height: 1.7;
}

/* ---------- 主框架：左年份索引 + 右长文 ---------- */
.page-about .about-frame {
  display: grid;
  gap: clamp(26px, 4vw, 54px);
}
.page-about .about-rail__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--clay);
}
.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}
.page-about .about-rail__list li {
  flex: 0 0 auto;
}
.page-about .about-rail__list a {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 12px;
  border: 2px solid var(--about-hair);
  color: var(--rock);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  white-space: nowrap;
  transition: color 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.page-about .about-rail__list a span:last-child {
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: 0.08em;
}
.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--ink);
  background: var(--amber);
  border-color: var(--amber);
}
.page-about .about-rail__top {
  display: inline-block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(81, 227, 210, 0.45);
  padding-bottom: 2px;
}
.page-about .about-rail__top:hover,
.page-about .about-rail__top:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  position: relative;
  padding: clamp(28px, 4.2vw, 56px) 0;
  border-top: 2px solid var(--about-hair);
}
.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .about-sec__num {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--clay);
}
.page-about .about-sec__num--paper {
  color: #8A5A34;
}
.page-about .about-sec__title {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  font-size: clamp(24px, 3.6vw, 44px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--cream);
}
.page-about .about-text p {
  max-width: 64ch;
  margin: 0 0 1.2em;
  font-size: 16px;
  line-height: 1.95;
  color: var(--about-soft);
}
.page-about .about-text p:last-child {
  margin-bottom: 0;
}
.page-about .about-text--lead {
  max-width: 62ch;
  margin: 0 0 clamp(18px, 3vw, 30px);
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--rock);
}
.page-about .about-text strong {
  color: var(--cream);
}

.page-about .about-cols {
  display: grid;
  gap: clamp(20px, 3vw, 38px);
}
.page-about .about-side {
  border-left: 3px solid var(--amber);
  padding: 2px 0 2px 16px;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--rock);
}
.page-about .about-side p {
  margin: 0 0 8px;
}
.page-about .about-side p:last-child {
  margin-bottom: 0;
}
.page-about .about-side strong {
  color: var(--amber);
  font-weight: 700;
}

/* ---------- 时间轴 ---------- */
.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}
.page-about .about-node {
  padding-top: 16px;
  border-top: 3px solid var(--moss);
  transition: border-color 0.2s ease;
}
.page-about .about-node:hover,
.page-about .about-node:focus-within {
  border-top-color: var(--amber);
}
.page-about .about-node:target {
  border-top-color: var(--cyan);
}
.page-about .about-node:target .about-node__year {
  color: var(--cyan);
}
.page-about .about-node__year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3vw, 36px);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--amber);
}
.page-about .about-node__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--cream);
}
.page-about .about-node__desc {
  margin: 0 0 12px;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--rock);
}
.page-about .about-node__fold {
  margin-top: 4px;
}
.page-about .about-tl__media {
  margin: clamp(26px, 3.6vw, 44px) 0 0;
}
.page-about .about-tl__media .media {
  border: 2px solid var(--about-hair);
}

/* ---------- 米白纸面 ---------- */
.page-about .about-sec--paper {
  margin: clamp(8px, 1.6vw, 16px) 0;
  padding: clamp(24px, 3.6vw, 48px) clamp(18px, 3vw, 42px);
  border: 2px solid var(--ink);
  border-top: 2px solid var(--ink);
  background:
    repeating-linear-gradient(180deg, rgba(10, 31, 26, 0.035) 0 2px, transparent 2px 6px),
    linear-gradient(168deg, var(--about-paper) 0%, var(--about-paper-2) 100%);
  color: #16241E;
  box-shadow: var(--shadow-hard);
}
.page-about .about-sec--paper .about-sec__title {
  color: #10201A;
}
.page-about .about-sec--paper .about-text p {
  color: #2A3A32;
  max-width: 60ch;
}
.page-about .about-steps {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 2px solid rgba(10, 31, 26, 0.18);
}
.page-about .about-steps li {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid rgba(10, 31, 26, 0.16);
}
.page-about .about-steps__n {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: #8A5A34;
  padding-top: 3px;
}
.page-about .about-steps h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: #10201A;
}
.page-about .about-steps p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: #33443B;
}
.page-about .about-inline-link {
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: #2A3A32;
}
.page-about .about-inline-link a {
  color: #10201A;
  font-weight: 700;
  text-decoration: none;
  border-bottom: 3px solid var(--clay);
  padding-bottom: 1px;
}
.page-about .about-inline-link a:hover,
.page-about .about-inline-link a:focus-visible {
  border-bottom-color: #10201A;
}

/* ---------- 团队 ---------- */
.page-about .about-cols--team {
  align-items: start;
}
.page-about .about-bars {
  list-style: none;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .about-bar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas: "label num" "track track";
  gap: 6px 12px;
  align-items: center;
}
.page-about .about-bar__label {
  grid-area: label;
  font-size: 13.5px;
  color: var(--cream);
  letter-spacing: 0.02em;
}
.page-about .about-bar__num {
  grid-area: num;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--amber);
  letter-spacing: 0.06em;
}
.page-about .about-bar__track {
  grid-area: track;
  display: block;
  height: 8px;
  background: rgba(139, 148, 139, 0.18);
  border-left: 2px solid var(--moss);
  overflow: hidden;
}
.page-about .about-bar__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--moss), var(--cyan));
}
.page-about .ab-w16 { width: 42.1%; }
.page-about .ab-w9 { width: 23.7%; }
.page-about .ab-w7 { width: 18.4%; }
.page-about .ab-w6 { width: 15.8%; }

.page-about .about-team__side {
  display: grid;
  gap: clamp(18px, 2.6vw, 26px);
}
.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  border-top: 2px solid var(--about-hair);
  border-bottom: 2px solid var(--about-hair);
  padding: 16px 0;
}
.page-about .about-metric {
  min-width: 0;
}
.page-about .about-metric__n {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.8vw, 32px);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: 0.02em;
}
.page-about .about-metric__n span {
  font-size: 0.5em;
  color: var(--rock);
  margin-left: 2px;
}
.page-about .about-metric__l {
  margin: 0;
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--rock);
}
.page-about .about-team__media {
  margin: 0;
}
.page-about .about-team__media .media {
  border: 2px solid var(--about-hair);
}
.page-about .about-team__media figcaption {
  margin: 10px 0 0;
  color: var(--rock);
  line-height: 1.7;
}

/* ---------- 合作 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.page-about .about-partner {
  padding: 16px 14px;
  border: 2px solid var(--about-hair);
  border-left: 6px solid var(--clay);
  background: rgba(44, 68, 56, 0.28);
}
.page-about .about-partner--wide {
  grid-column: 1 / -1;
  border-left-color: var(--amber);
  background: rgba(227, 168, 63, 0.1);
}
.page-about .about-partner__n {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.2vw, 38px);
  line-height: 1;
  color: var(--amber);
  letter-spacing: 0.02em;
}
.page-about .about-partner__t {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 18px;
  letter-spacing: 0.06em;
  color: var(--amber);
}
.page-about .about-partner__l {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--rock);
}
.page-about .about-partner--wide .about-partner__l {
  color: var(--cream);
  font-size: 13.5px;
}

/* ---------- 收束 ---------- */
.page-about .about-sec--promise {
  border-top-color: var(--amber);
}
.page-about .about-quote {
  margin: 0 0 clamp(22px, 3.4vw, 38px);
  padding: 4px 0 4px clamp(16px, 2.4vw, 26px);
  border-left: 6px solid var(--amber);
  font-size: clamp(21px, 3.1vw, 38px);
  line-height: 1.36;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--cream);
}
.page-about .about-values {
  display: grid;
  gap: 16px;
}
.page-about .about-value {
  padding-top: 14px;
  border-top: 2px solid var(--about-hair);
}
.page-about .about-value h3 {
  margin: 0 0 8px;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--cyan);
}
.page-about .about-value p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--about-soft);
}
.page-about .about-cta {
  margin-top: clamp(26px, 4vw, 44px);
  padding: clamp(18px, 2.6vw, 28px);
  border: 2px solid var(--moss);
  background: rgba(17, 21, 20, 0.72);
  box-shadow: var(--shadow-hard-sm);
  display: grid;
  gap: 16px;
}
.page-about .about-cta__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--cream);
}
.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-values {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
  .page-about .about-steps li {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 18px;
  }
  .page-about .about-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-tl {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
  }
  .page-about .about-hero__facts span {
    font-size: 12px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }
  .page-about .about-cols {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 0.9fr);
    align-items: start;
  }
  .page-about .about-cols--team {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(24px, 3.4vw, 44px);
  }
  .page-about .about-tl {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 1024px) {
  .page-about .about-frame {
    grid-template-columns: 176px minmax(0, 1fr);
    align-items: start;
    gap: clamp(32px, 4vw, 64px);
  }
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--bar-h) + 28px);
    align-self: start;
  }
  .page-about .about-rail__label {
    margin-bottom: 12px;
  }
  .page-about .about-rail__list {
    flex-direction: column;
    overflow: visible;
    border-top: 2px solid var(--about-hair);
    gap: 0;
  }
  .page-about .about-rail__list a {
    flex-direction: row;
    align-items: baseline;
    justify-content: space-between;
    border: 0;
    border-bottom: 1px solid var(--about-hair);
    padding: 12px 6px;
  }
  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    padding-left: 12px;
  }
  .page-about .about-hero__media .media {
    box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.6);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__list a,
  .page-about .about-node {
    transition: none;
  }
}
</main>