.page-about {
  --about-line: 16px;
  --about-pad: 48px;
  background: var(--warm);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

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

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-head);
}

.page-about .about-sec,
.page-about .tl-item,
.page-about .about-next {
  scroll-margin-top: 74px;
}

.page-about .grid > * {
  min-width: 0;
}

.page-about .eyebrow {
  color: var(--crimson);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  background: var(--ink);
  color: var(--white);
  overflow: hidden;
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.4;
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(102deg, rgba(11, 11, 13, 0.98) 0%, rgba(11, 11, 13, 0.9) 46%, rgba(11, 11, 13, 0.42) 82%, rgba(122, 12, 27, 0.55) 100%);
}

.page-about .about-hero__diag {
  position: absolute;
  z-index: 1;
  right: -14%;
  bottom: -40%;
  width: min(560px, 72vw);
  aspect-ratio: 1 / 1;
  background: linear-gradient(150deg, var(--crimson) 0%, var(--crimson-deep) 100%);
  clip-path: polygon(46% 0, 100% 18%, 100% 100%, 0 100%, 10% 30%);
  opacity: 0.9;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
  padding-block: clamp(52px, 9vw, 108px) clamp(44px, 7vw, 82px);
}

.page-about .about-hero .breadcrumb {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5em;
  margin: 0 0 clamp(20px, 3vw, 30px);
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(244, 240, 232, 0.66);
}

.page-about .about-hero .breadcrumb a {
  color: var(--white);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
}

.page-about .about-hero .breadcrumb a:hover {
  color: var(--gold);
}

.page-about .about-hero h1 {
  font-size: var(--step-1);
  font-weight: 900;
  line-height: 0.98;
  letter-spacing: -0.03em;
  margin: 0 0 clamp(18px, 3vw, 28px);
  max-width: 16ch;
}

.page-about .about-hero__lead {
  max-width: 48ch;
  margin: 0;
  font-size: clamp(1rem, 1.55vw, 1.1rem);
  line-height: 1.8;
  color: rgba(244, 240, 232, 0.86);
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(30px, 5vw, 54px);
  background: rgba(244, 240, 232, 0.2);
  border: 1px solid rgba(244, 240, 232, 0.2);
  max-width: 860px;
}

.page-about .hero-stat {
  background: rgba(11, 11, 13, 0.62);
  padding: clamp(14px, 2vw, 22px) clamp(14px, 2vw, 20px);
}

.page-about .hero-stat b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3vw, 1.95rem);
  line-height: 1;
  color: var(--gold);
  letter-spacing: -0.02em;
}

.page-about .hero-stat span {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(244, 240, 232, 0.72);
}

/* ---------- 通用段落 ---------- */
.page-about .about-sec {
  padding-block: clamp(46px, 7.5vw, 94px);
  border-bottom: 1px solid rgba(58, 58, 66, 0.22);
}

.page-about .about-sec--plain {
  background: var(--warm);
}

.page-about .about-sec--sand {
  background: var(--sand);
}

.page-about .about-sec--dark {
  background: var(--charcoal);
  color: var(--white);
  border-bottom: 0;
}

.page-about .about-sec--dark .eyebrow {
  color: var(--gold);
}

.page-about .about-sec--dark h2 {
  color: var(--white);
}

.page-about .about-sec--dark .prose p,
.page-about .about-sec--dark .sec-lead {
  color: rgba(244, 240, 232, 0.82);
}

.page-about .sec-head {
  max-width: 60ch;
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .sec-head h2 {
  font-size: var(--step-2);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -0.03em;
  margin: 0;
}

.page-about .sec-lead {
  margin: 14px 0 0;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--charcoal);
}

.page-about h2 + .prose,
.page-about .eyebrow + h2 {
  margin-top: 0;
}

.page-about .about-sec .prose {
  margin-top: clamp(16px, 2.4vw, 24px);
}

.page-about .about-sec .prose p {
  margin: 0 0 1.15em;
  line-height: 1.8;
  font-size: 1rem;
  color: var(--charcoal);
}

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

.page-about .inline-link {
  display: inline-block;
  margin-top: 16px;
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--crimson);
  text-decoration: none;
  border-bottom: 2px solid var(--crimson);
  padding-bottom: 2px;
  transition: color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}

.page-about .inline-link:hover {
  color: var(--crimson-deep);
  border-color: var(--crimson-deep);
}

.page-about .mini-title {
  font-size: 1.05rem;
  font-weight: 900;
  letter-spacing: -0.01em;
  margin: 0 0 14px;
  padding-left: 12px;
  border-left: 4px solid var(--crimson);
  line-height: 1.2;
}

/* ---------- 起点档案 ---------- */
.page-about .origin-card {
  border: 2px solid var(--ink);
  background: var(--sand);
  padding: clamp(18px, 2.6vw, 28px);
  box-shadow: 6px 6px 0 rgba(11, 11, 13, 0.16);
  align-self: start;
}

.page-about .origin-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .origin-list li {
  padding: 12px 0;
  border-bottom: 1px solid rgba(11, 11, 13, 0.16);
}

.page-about .origin-list li:first-child {
  padding-top: 0;
}

.page-about .origin-list span {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--crimson-deep);
  margin-bottom: 5px;
}

.page-about .origin-list strong {
  display: block;
  font-size: 1rem;
  line-height: 1.45;
}

.page-about .origin-link {
  display: inline-block;
  margin-top: 18px;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid var(--crimson);
  padding-bottom: 2px;
}

.page-about .origin-link:hover {
  color: var(--crimson);
}

/* ---------- 年份导航 ---------- */
.page-about .year-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(24px, 3.6vw, 38px);
}

.page-about .year-nav a {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  text-decoration: none;
  color: var(--ink);
  background: var(--white);
  border: 2px solid var(--ink);
  padding: 8px 15px;
  transition: transform var(--fast) var(--ease), background var(--fast) var(--ease), color var(--fast) var(--ease), box-shadow var(--fast) var(--ease);
}

.page-about .year-nav a:hover,
.page-about .year-nav a:focus-visible {
  background: var(--crimson);
  color: var(--white);
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 rgba(11, 11, 13, 0.35);
  outline: none;
}

/* ---------- 时间轴 ---------- */
.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 var(--about-pad);
  position: relative;
  display: grid;
  gap: clamp(18px, 2.6vw, 26px);
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: var(--about-line);
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--crimson) 0%, var(--crimson-deep) 62%, var(--smoke) 100%);
}

.page-about .tl-item {
  position: relative;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: calc(var(--about-line) - var(--about-pad) - 6px);
  top: 22px;
  width: 14px;
  height: 14px;
  background: var(--warm);
  border: 2px solid var(--crimson);
  transform: rotate(45deg);
  z-index: 1;
}

.page-about .tl-card {
  display: grid;
  gap: 10px;
  padding: clamp(16px, 2.4vw, 26px);
  background: var(--white);
  border: 2px solid var(--ink);
  box-shadow: 6px 6px 0 rgba(11, 11, 13, 0.16);
  transition: transform var(--fast) var(--ease), box-shadow var(--fast) var(--ease);
}

.page-about .tl-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 rgba(213, 18, 43, 0.28);
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.8rem, 6vw, 2.7rem);
  line-height: 0.9;
  letter-spacing: -0.05em;
  color: var(--crimson);
}

.page-about .tl-body h3 {
  margin: 0 0 8px;
  font-size: var(--step-3);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.page-about .tl-body p {
  margin: 0 0 12px;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--charcoal);
}

.page-about .tl-body .tag {
  font-family: var(--font-mono);
}

/* ---------- 图片区 ---------- */
.page-about .fig {
  margin: 0;
  border: 2px solid var(--ink);
  background: var(--ink);
  position: relative;
  overflow: hidden;
  align-self: start;
}

.page-about .fig img {
  width: 100%;
  object-fit: cover;
}

.page-about .fig figcaption {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.07em;
  color: rgba(244, 240, 232, 0.72);
  padding: 10px 13px;
  border-top: 1px solid var(--smoke);
}

.page-about .about-sec--dark .fig {
  border-color: var(--smoke);
  background: var(--ink);
}

.page-about .tl-figure img {
  aspect-ratio: 3 / 2;
}

.page-about .cov-figure img {
  aspect-ratio: 12 / 7;
}

/* ---------- 运营体系 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: clamp(30px, 4.5vw, 48px);
}

.page-about .team-card {
  border: 2px solid var(--ink);
  background: var(--white);
  padding: clamp(16px, 2.4vw, 24px);
  box-shadow: 5px 5px 0 rgba(11, 11, 13, 0.2);
}

.page-about .team-card b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 4.4vw, 2.7rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.page-about .team-card span {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--smoke);
}

.page-about .who-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--ink);
}

.page-about .who-list li {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 14px 2px;
  border-bottom: 1px solid rgba(11, 11, 13, 0.2);
}

.page-about .who-key {
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1.4;
}

.page-about .who-val {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--crimson-deep);
  background: rgba(213, 18, 43, 0.09);
  border: 1px solid rgba(213, 18, 43, 0.32);
  padding: 4px 9px;
  white-space: nowrap;
}

.page-about .cadence {
  border: 2px solid var(--ink);
  background: var(--warm);
  padding: clamp(16px, 2.6vw, 26px);
  align-self: start;
}

.page-about .cadence-line {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: baseline;
  margin: 0 0 12px;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--charcoal);
}

.page-about .cadence-line:last-of-type {
  margin-bottom: 0;
}

.page-about .cadence-line span {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--white);
  background: var(--ink);
  padding: 3px 9px;
  white-space: nowrap;
}

/* ---------- 服务覆盖 ---------- */
.page-about .term-list {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .term {
  border: 1px solid var(--smoke);
  background: rgba(244, 240, 232, 0.05);
  padding: 14px 16px;
  transition: border-color var(--fast) var(--ease), background var(--fast) var(--ease), transform var(--fast) var(--ease);
}

.page-about .term:hover {
  border-color: var(--gold);
  background: rgba(201, 162, 39, 0.1);
  transform: translateY(-2px);
}

.page-about .term strong {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .term strong::before {
  content: "";
  width: 8px;
  height: 8px;
  flex: none;
  background: var(--teal);
}

.page-about .term p {
  margin: 7px 0 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: rgba(244, 240, 232, 0.8);
}

/* ---------- 档案方法 ---------- */
.page-about .arch-grid {
  display: grid;
  gap: 16px;
}

.page-about .arch-card {
  position: relative;
  border: 2px solid var(--ink);
  background: var(--white);
  padding: clamp(18px, 2.6vw, 26px);
  box-shadow: 5px 5px 0 rgba(11, 11, 13, 0.14);
}

.page-about .arch-card::before {
  content: "";
  position: absolute;
  left: -2px;
  top: -2px;
  width: 14px;
  height: 36px;
  background: var(--crimson);
}

.page-about .arch-card h3 {
  margin: 0 0 9px;
  padding-left: 18px;
  font-size: 1.1rem;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.page-about .arch-card p {
  margin: 0;
  padding-left: 18px;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--charcoal);
}

.page-about .archive-note {
  margin-top: clamp(24px, 3.6vw, 38px);
  border-left: 4px solid var(--gold);
  background: var(--sand);
  padding: clamp(16px, 2.4vw, 24px);
}

.page-about .archive-note p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--charcoal);
}

/* ---------- 收束区 ---------- */
.page-about .about-next {
  position: relative;
  background: var(--ink);
  color: var(--white);
  padding-block: clamp(50px, 8vw, 96px);
}

.page-about .about-next::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--crimson) 0%, var(--crimson) 52%, var(--gold) 100%);
}

.page-about .about-next__inner {
  max-width: 760px;
}

.page-about .about-next .eyebrow {
  color: var(--gold);
}

.page-about .about-next h2 {
  margin: 0 0 16px;
  font-size: var(--step-2);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.03em;
}

.page-about .about-next p {
  margin: 0;
  max-width: 52ch;
  line-height: 1.8;
  color: rgba(244, 240, 232, 0.8);
}

.page-about .next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .next-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: var(--white);
  background: transparent;
  border: 2px solid rgba(244, 240, 232, 0.6);
  transition: transform var(--fast) var(--ease), box-shadow var(--fast) var(--ease), background var(--fast) var(--ease), border-color var(--fast) var(--ease);
}

.page-about .next-link:hover {
  transform: translate(-2px, -2px);
  border-color: var(--white);
  box-shadow: 5px 5px 0 rgba(201, 162, 39, 0.7);
}

.page-about .next-link--solid {
  background: var(--crimson);
  border-color: var(--crimson);
}

.page-about .next-link--solid:hover {
  background: var(--crimson-deep);
  border-color: var(--crimson-deep);
}

.page-about .next-link .arw {
  font-family: var(--font-mono);
  color: var(--gold);
}

.page-about .next-more {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--smoke);
}

.page-about .next-more a {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: rgba(244, 240, 232, 0.72);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}

.page-about .next-more a:hover {
  color: var(--gold);
  border-color: var(--gold);
}

/* ---------- 断点 ---------- */
@media (min-width: 560px) {
  .page-about .term-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 640px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .arch-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-sec,
  .page-about .tl-item,
  .page-about .about-next {
    scroll-margin-top: 24px;
  }

  .page-about .tl {
    --about-pad: 58px;
    --about-line: 22px;
  }

  .page-about .tl-card {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: clamp(18px, 2.4vw, 32px);
    align-items: start;
  }

  .page-about .tl-item:nth-child(even) .tl-card {
    margin-right: clamp(20px, 12vw, 170px);
  }

  .page-about .tl-figure {
    position: sticky;
    top: 28px;
  }

  .page-about .origin-card {
    margin-top: 8px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__inner {
    padding-block: clamp(72px, 8vw, 118px) clamp(60px, 6vw, 92px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-card,
  .page-about .year-nav a,
  .page-about .next-link,
  .page-about .term {
    transition: none;
  }

  .page-about .tl-card:hover,
  .page-about .next-link:hover,
  .page-about .term:hover {
    transform: none;
  }
}
<<<END>>>