/* ================= 品牌自述 · 页面专属样式 ================= */

.page-about {
  --about-panel: var(--warm);
  --about-dark: var(--deep);
  background:
    radial-gradient(120% 62% at 100% 0%, rgba(14, 42, 90, .07), transparent 58%),
    var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  padding-bottom: clamp(36px, 6vw, 80px);
}

.page-about .about-head {
  display: grid;
  gap: 10px;
  border-top: 3px solid var(--ink);
  padding-top: clamp(14px, 2.6vw, 22px);
  margin-bottom: clamp(22px, 4vw, 38px);
}

.page-about .about-head__lead {
  margin: 0;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.72;
  max-width: 46ch;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-top: clamp(16px, 3vw, 28px);
  padding-bottom: clamp(30px, 5vw, 60px);
  border-bottom: var(--line);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  margin-top: clamp(18px, 3vw, 30px);
}

.page-about .about-hero__frame {
  margin: 0;
  border: var(--line);
  background: var(--about-panel);
  padding: 10px 10px 0;
  box-shadow: 8px 8px 0 var(--mist);
}

.page-about .about-hero__frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-hero__caption {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 10px 2px 12px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--ink-soft);
}

.page-about .about-hero__caption span {
  font-family: var(--font-num);
  font-weight: 800;
  color: var(--orange);
}

.page-about .about-hero__kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 14px;
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-hero__kicker::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--mist);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 6.2vw, 60px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 42ch;
  font-size: clamp(15px, 2.1vw, 17px);
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--mist);
  border: var(--line-soft);
}

.page-about .about-hero__facts li {
  background: var(--paper);
  padding: 12px 14px;
}

.page-about .about-hero__fact-num {
  display: block;
  font-family: var(--font-num);
  font-weight: 800;
  font-size: 22px;
  line-height: 1;
  color: var(--blue);
}

.page-about .about-hero__fact-label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--ink-soft);
}

/* ---------- 定位 ---------- */

.page-about .about-position {
  padding: clamp(34px, 6vw, 66px) 0;
  border-bottom: var(--line);
}

.page-about .about-position__grid {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
}

.page-about .about-position__note {
  border-left: 5px solid var(--orange);
  padding: 4px 0 4px 18px;
}

.page-about .about-position__quote {
  margin: 14px 0 10px;
  font-family: var(--font-display);
  font-size: clamp(22px, 4vw, 30px);
  line-height: 1.35;
  font-weight: 700;
  color: var(--blue);
}

.page-about .about-position__sign {
  margin: 0;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--ink-soft);
}

.page-about .about-position__title {
  font-family: var(--font-display);
  font-size: clamp(24px, 4.2vw, 34px);
  line-height: 1.28;
  margin: 0 0 16px;
}

.page-about .about-position__body p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.82;
  color: var(--ink-soft);
}

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

.page-about .about-position__body a {
  color: var(--blue);
  text-decoration: underline;
  text-decoration-color: var(--orange);
  text-underline-offset: 3px;
}

/* ---------- 演进时间轴 ---------- */

.page-about .about-evolution {
  padding: clamp(34px, 6vw, 66px) 0;
}

.page-about .about-evolution__visual {
  margin: 0 0 clamp(24px, 4vw, 40px);
  border: var(--line-soft);
  background: var(--blue);
  padding: 8px;
}

.page-about .about-evolution__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 3;
  object-fit: cover;
}

.page-about .about-evolution__caption {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 10px 4px 4px;
  font-size: 12px;
  letter-spacing: .04em;
  color: rgba(247, 245, 239, .78);
}

.page-about .about-evolution__caption span {
  font-family: var(--font-num);
  font-weight: 800;
  color: var(--orange);
}

.page-about .about-axis {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
}

.page-about .about-axis__rail-wrap {
  overflow-x: auto;
  padding-bottom: 4px;
}

.page-about .about-axis__rail {
  list-style: none;
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0;
}

.page-about .about-axis__year {
  display: block;
  padding: 8px 14px;
  font-family: var(--font-num);
  font-weight: 800;
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--ink-soft);
  text-decoration: none;
  white-space: nowrap;
  border: var(--line-soft);
  border-radius: 999px;
  transition: color .2s ease, border-color .2s ease, background-color .2s ease;
}

.page-about .about-axis__year:hover,
.page-about .about-axis__year:focus-visible {
  color: var(--ink);
  border-color: var(--orange);
  background: rgba(255, 106, 26, .1);
}

.page-about .about-stage {
  position: relative;
  padding: 0 0 clamp(22px, 3.4vw, 34px) clamp(22px, 4vw, 34px);
  border-left: 1px solid var(--mist);
  scroll-margin-top: 96px;
}

.page-about .about-stage:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--blue);
}

.page-about .about-stage:target::before {
  background: var(--orange);
  border-color: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 26, .2);
}

.page-about .about-stage__year {
  margin: 0 0 6px;
  font-family: var(--font-num);
  font-weight: 800;
  font-size: clamp(26px, 4.4vw, 38px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--blue);
}

.page-about .about-stage:target .about-stage__year {
  color: var(--orange);
}

.page-about .about-stage__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.8vw, 22px);
  line-height: 1.35;
}

.page-about .about-stage__text {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 团队 ---------- */

.page-about .about-crew {
  padding: clamp(34px, 6vw, 66px) 0;
  background: var(--paper);
  border-top: var(--line);
  border-bottom: var(--line);
}

.page-about .about-crew__visual {
  margin: 0 0 clamp(20px, 3.4vw, 32px);
  border: var(--line-soft);
  background: var(--about-panel);
  padding: 8px;
}

.page-about .about-crew__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-about .about-crew__caption {
  margin: 0;
  padding: 10px 4px 4px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--ink-soft);
}

.page-about .about-crew__caption span {
  font-family: var(--font-num);
  font-weight: 800;
  color: var(--orange);
}

.page-about .about-crew__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--mist);
  border: var(--line-soft);
}

.page-about .about-crew__card {
  background: var(--paper);
  padding: 16px 16px 14px;
  transition: background-color .2s ease;
}

.page-about .about-crew__card[open] {
  background: var(--about-panel);
}

.page-about .about-crew__card summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 12px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-crew__card summary::-webkit-details-marker {
  display: none;
}

.page-about .about-crew__name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-crew__meta {
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--teal-deep);
}

.page-about .about-crew__card summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-num);
  font-size: 17px;
  font-weight: 800;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-crew__card[open] summary::after {
  content: "–";
}

.page-about .about-crew__desc {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-about .about-crew__desc a {
  color: var(--blue);
  text-decoration: underline;
  text-decoration-color: var(--orange);
  text-underline-offset: 3px;
}

/* ---------- 分类体系（深色） ---------- */

.page-about .about-taxonomy {
  background: linear-gradient(152deg, var(--blue) 0%, var(--deep) 100%);
  color: var(--paper);
  padding: clamp(38px, 6.5vw, 76px) 0;
}

.page-about .about-taxonomy__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-taxonomy__kicker {
  margin: 0 0 12px;
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--teal);
}

.page-about .about-taxonomy__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 4.4vw, 36px);
  line-height: 1.26;
  color: var(--paper);
}

.page-about .about-taxonomy__text {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.82;
  color: rgba(247, 245, 239, .82);
}

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

.page-about .about-taxonomy__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-content: flex-start;
  gap: 8px;
}

.page-about .about-taxonomy__list li {
  padding: 7px 13px;
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--paper);
  border: 1px solid rgba(247, 245, 239, .3);
  border-radius: 2px;
  transition: border-color .2s ease, color .2s ease;
}

.page-about .about-taxonomy__list li:nth-child(3n + 1) {
  border-color: rgba(255, 106, 26, .62);
}

.page-about .about-taxonomy__list li:nth-child(4n + 2) {
  border-color: rgba(139, 92, 246, .7);
}

.page-about .about-taxonomy__list li:nth-child(5n + 3) {
  border-color: rgba(45, 212, 191, .65);
}

/* ---------- 运营节奏 ---------- */

.page-about .about-rhythm {
  padding: clamp(34px, 6vw, 66px) 0;
  background: var(--about-panel);
}

.page-about .about-rhythm__grid {
  margin: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--mist);
  border: var(--line-soft);
}

.page-about .about-rhythm__item {
  background: var(--paper);
  padding: 18px 18px 20px;
}

.page-about .about-rhythm__item dt {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 16px;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-rhythm__num {
  display: block;
  font-family: var(--font-num);
  font-weight: 800;
  font-size: 24px;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--blue);
  margin-bottom: 6px;
}

.page-about .about-rhythm__item dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--ink-soft);
}

/* ---------- 服务范围与联系 ---------- */

.page-about .about-reach {
  padding: clamp(34px, 6vw, 66px) 0 0;
}

.page-about .about-reach__panel {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  border: var(--line);
  border-top: 6px solid var(--orange);
  background: var(--paper);
  padding: clamp(22px, 4vw, 42px);
  box-shadow: var(--shadow-card);
}

.page-about .about-reach__kicker {
  margin: 0 0 12px;
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-reach__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(22px, 3.8vw, 30px);
  line-height: 1.32;
}

.page-about .about-reach__text {
  margin: 0 0 22px;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

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

.page-about .about-reach__list {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--mist);
  border: var(--line-soft);
  align-content: start;
}

.page-about .about-reach__row {
  background: var(--about-panel);
  padding: 12px 14px;
}

.page-about .about-reach__row dt {
  margin: 0 0 4px;
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.page-about .about-reach__row dd {
  margin: 0;
  font-family: var(--font-num);
  font-size: 14.5px;
  font-weight: 700;
  color: var(--ink);
  word-break: break-word;
}

.page-about .about-reach__row dd a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--orange);
  text-underline-offset: 3px;
}

.page-about .about-reach__row dd a:hover,
.page-about .about-reach__row dd a:focus-visible {
  color: var(--blue);
}

/* ---------- 焦点可见性 ---------- */

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 560px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 840px) {
  .page-about .about-head {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 1fr);
    column-gap: clamp(24px, 5vw, 56px);
    align-items: end;
  }

  .page-about .about-head > .section-kicker {
    grid-column: 1 / -1;
  }

  .page-about .about-head > .section-title {
    grid-column: 1;
  }

  .page-about .about-head > .about-head__lead {
    grid-column: 2;
    justify-self: end;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
    align-items: end;
    gap: clamp(28px, 5vw, 64px);
  }

  .page-about .about-position__grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    gap: clamp(28px, 5vw, 64px);
  }

  .page-about .about-axis {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: clamp(26px, 4vw, 56px);
  }

  .page-about .about-axis__rail-wrap {
    position: sticky;
    top: 96px;
    align-self: start;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-axis__rail {
    flex-direction: column;
    gap: 10px;
  }

  .page-about .about-axis__year {
    border-radius: 0;
    border-width: 0 0 0 2px;
    border-style: solid;
    border-color: var(--mist);
    padding: 6px 0 6px 14px;
  }

  .page-about .about-axis__year:hover,
  .page-about .about-axis__year:focus-visible {
    background: transparent;
    border-left-color: var(--orange);
  }

  .page-about .about-taxonomy__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
  }

  .page-about .about-reach__panel {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .about-crew__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-axis__year,
  .page-about .about-crew__card,
  .page-about .about-taxonomy__list li {
    transition: none;
  }
}
<<<END>>>