.page-about {
  --about-axis: rgba(27, 79, 160, 0.22);
  --about-line: rgba(32, 39, 46, 0.12);
  --about-card-gap: 20px;
}

.page-about .h2 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  font-size: clamp(24px, 5vw, 38px);
  line-height: 1.24;
  color: var(--ink-900);
  margin: 10px 0 14px;
}

.page-about h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  line-height: 1.4;
  color: var(--ink-900);
  letter-spacing: -0.01em;
}

.page-about p {
  line-height: 1.75;
}

/* ---------- 01 品牌概述 ---------- */

.page-about .about-hero {
  padding-top: 30px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  font-size: clamp(30px, 7.4vw, 54px);
  line-height: 1.1;
  color: var(--ink-900);
  margin: 10px 0 18px;
}

.page-about .about-hero__lead {
  font-size: 17px;
  color: var(--ink-700);
  max-width: 60ch;
  margin: 0 0 18px;
}

.page-about .about-hero__text {
  color: var(--ink-700);
  max-width: 62ch;
  margin: 0;
}

.page-about .about-facts {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--r-card);
  overflow: hidden;
}

.page-about .about-fact {
  background: var(--paper-0);
  padding: 15px 18px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-fact__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gray-400);
  margin: 0;
}

.page-about .about-fact__v {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 18px;
  color: var(--azure-600);
  margin: 0;
}

/* ---------- 02 发展时间线 ---------- */

.page-about .about-timeline__lead {
  max-width: 58ch;
  color: var(--ink-700);
}

.page-about .about-timeline__figure {
  margin: 32px 0 10px;
}

.page-about .timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 22px;
  border-left: 1px solid var(--about-line);
  display: grid;
  gap: 30px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--paper-0);
  border: 2px solid var(--azure-600);
}

.page-about .tl-item__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: 0.02em;
  color: var(--gold-500);
  margin-bottom: 6px;
}

.page-about .tl-item__body p {
  margin: 8px 0 0;
  color: var(--ink-700);
  max-width: 66ch;
}

/* ---------- 03 两条产品线 ---------- */

.page-about .about-lines__lead {
  max-width: 58ch;
  color: var(--ink-700);
}

.page-about .line-stack {
  display: grid;
  gap: var(--about-card-gap);
  margin-top: 34px;
}

.page-about .line-card {
  position: relative;
  border-radius: var(--r-card);
  border: 1px solid var(--about-line);
  padding: 26px 22px 26px 28px;
  overflow: hidden;
}

.page-about .line-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  background: linear-gradient(180deg, var(--azure-600), var(--gold-500), var(--crimson-600));
}

.page-about .line-card--home {
  background: var(--sand-100);
  border-color: rgba(27, 79, 160, 0.3);
}

.page-about .line-card--biz {
  background: var(--ink-900);
  border-color: var(--line-gold);
}

.page-about .line-card__head h3 {
  margin: 10px 0 0;
}

.page-about .line-card--biz h3 {
  color: var(--paper-0);
}

.page-about .line-card__desc {
  margin: 14px 0 18px;
  color: var(--ink-700);
  max-width: 62ch;
}

.page-about .line-card--biz .line-card__desc {
  color: rgba(250, 247, 241, 0.78);
}

.page-about .line-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(32, 39, 46, 0.12);
  border-top: 1px solid rgba(32, 39, 46, 0.12);
}

.page-about .line-points li {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 12px;
  padding: 11px 0;
  background: transparent;
  font-size: 15px;
  color: var(--ink-700);
}

.page-about .line-card--home .line-points li {
  background: var(--sand-100);
}

.page-about .line-card--biz .line-points {
  background: var(--line-ink);
  border-top-color: var(--line-ink);
}

.page-about .line-card--biz .line-points li {
  background: var(--ink-900);
  color: rgba(250, 247, 241, 0.82);
}

.page-about .line-points__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--gray-400);
}

.page-about .line-card--biz .line-points__k {
  color: var(--gold-500);
}

.page-about .about-lines__foot {
  margin: 26px 0 0;
  color: var(--ink-700);
  max-width: 62ch;
}

.page-about .about-lines__foot a {
  color: var(--azure-600);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 04 团队与内容源 ---------- */

.page-about .about-team__lead {
  max-width: 64ch;
  color: var(--ink-700);
}

.page-about .about-roles {
  margin-top: 30px;
}

.page-about .about-role {
  padding: 22px 20px;
}

.page-about .about-role__code {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold-500);
  margin: 0 0 10px;
}

.page-about .about-role h3 {
  margin: 0 0 10px;
}

.page-about .about-role p:last-child {
  margin: 0;
  color: var(--ink-700);
  font-size: 15px;
}

.page-about .about-source {
  margin-top: 38px;
  display: grid;
  gap: 22px;
}

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

.page-about .about-source__text h3 {
  margin: 0 0 12px;
}

.page-about .about-source__text p {
  margin: 0;
  color: var(--ink-700);
  max-width: 60ch;
}

/* ---------- 05 覆盖与规模 ---------- */

.page-about .about-scale__lead {
  max-width: 60ch;
  color: var(--ink-700);
}

.page-about .about-stats {
  margin-top: 32px;
  display: grid;
  gap: 24px;
}

.page-about .about-stat {
  border-top: 2px solid var(--azure-600);
  padding-top: 16px;
}

.page-about .about-stat:nth-child(2) {
  border-top-color: var(--gold-500);
}

.page-about .about-stat:nth-child(3) {
  border-top-color: var(--crimson-600);
}

.page-about .about-stat:nth-child(4) {
  border-top-color: var(--oasis-500);
}

.page-about .about-stat__n {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(28px, 7vw, 40px);
  letter-spacing: -0.02em;
  color: var(--ink-900);
  line-height: 1.1;
}

.page-about .about-stat__u {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gray-400);
  margin-top: 6px;
}

.page-about .about-stat p {
  margin: 12px 0 0;
  color: var(--ink-700);
  font-size: 15px;
}

.page-about .about-scale__foot {
  margin: 30px 0 0;
  color: var(--ink-700);
}

.page-about .about-scale__foot a {
  color: var(--azure-600);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 06 资质与站点信息 ---------- */

.page-about .cred-card {
  margin-top: 28px;
  border: 1px solid var(--about-line);
  border-radius: var(--r-card);
  background: var(--paper-0);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.page-about .cred-row {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 14px;
  align-items: baseline;
  padding: 14px 18px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .cred-row:last-child {
  border-bottom: none;
}

.page-about .cred-key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gray-400);
}

.page-about .cred-val {
  font-size: 15px;
  color: var(--ink-700);
  word-break: break-word;
}

.page-about .cred-val--copy {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--ink-900);
  -webkit-user-select: all;
  user-select: all;
  cursor: text;
}

.page-about .about-cred__foot {
  margin: 24px 0 0;
  color: var(--ink-700);
}

.page-about .about-cred__foot a {
  color: var(--azure-600);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 断点 ---------- */

@media (min-width: 620px) {
  .page-about .about-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px 34px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: 44px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) 268px;
    gap: 52px;
    align-items: start;
  }

  .page-about .about-facts {
    position: sticky;
    top: 116px;
  }

  .page-about .timeline {
    padding-left: 0;
    border-left: none;
    position: relative;
    gap: 0;
  }

  .page-about .timeline::before {
    content: "";
    position: absolute;
    left: 148px;
    top: 10px;
    bottom: 10px;
    width: 1px;
    background: linear-gradient(180deg, var(--azure-600), var(--gold-500), rgba(201, 138, 30, 0));
    opacity: 0.5;
  }

  .page-about .tl-item {
    display: grid;
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 0;
  }

  .page-about .tl-item::before {
    left: 143px;
    top: 12px;
  }

  .page-about .tl-item__year {
    text-align: right;
    padding-right: 26px;
    margin-bottom: 0;
    font-size: 24px;
  }

  .page-about .tl-item__body {
    padding: 0 0 42px 36px;
  }

  .page-about .tl-item:last-child .tl-item__body {
    padding-bottom: 0;
  }

  .page-about .line-card--home {
    margin-right: 14%;
  }

  .page-about .line-card--biz {
    margin-left: 14%;
  }

  .page-about .line-card {
    padding: 32px 30px 32px 36px;
  }

  .page-about .about-source {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 38px;
    align-items: center;
    margin-top: 46px;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 30px;
  }

  .page-about .cred-row {
    grid-template-columns: 120px 1fr;
    padding: 16px 24px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__grid {
    gap: 72px;
  }
}
</PAGE_CSS>>>