.page-about {
  --ab-hair: rgba(198, 192, 178, 0.18);
  --ab-moss-soft: rgba(92, 122, 110, 0.5);
  --ab-amber-soft: rgba(240, 169, 59, 0.22);
  background: var(--deep);
  color: var(--paper);
  overflow-x: hidden;
  overflow-x: clip;
}

.page-about .section {
  padding-block: clamp(52px, 8vw, 104px);
}

.page-about .section--paper .section__title {
  color: var(--ink);
}

.page-about .section--paper .eyebrow {
  color: var(--clay);
}

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

.page-about .figure__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: var(--line) solid var(--moss);
  object-fit: cover;
}

.page-about .figure__cap {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--moss);
}

.page-about .section--paper .figure__cap {
  color: var(--clay);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-block: clamp(32px, 5vw, 60px) clamp(48px, 7vw, 92px);
  border-bottom: 2px solid var(--ab-hair);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(32px, 5vw, 56px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-sans);
  font-size: clamp(34px, 8.2vw, 74px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
  max-width: 17ch;
  color: var(--paper);
}

.page-about .about-hero__intro {
  margin: 20px 0 0;
  max-width: 58ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--stone);
}

.page-about .about-hero__stats {
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 3px solid var(--cyan);
}

.page-about .about-hero__stat {
  padding: 16px 12px 14px 0;
  border-right: 1px solid var(--ab-hair);
}

.page-about .about-hero__stat:last-child {
  border-right: 0;
}

.page-about .about-hero__stat-label {
  font-size: 12px;
  letter-spacing: 0.08em;
  line-height: 1.4;
  color: var(--moss);
}

.page-about .about-hero__stat-value {
  margin: 8px 0 0;
  font-family: var(--font-data);
  font-size: clamp(26px, 5.6vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

/* ---------- 品牌起点 ---------- */

.page-about .about-origin__figure {
  margin-bottom: clamp(34px, 5.5vw, 62px);
}

.page-about .about-origin__figure .figure__img {
  aspect-ratio: 3 / 1;
}

.page-about .about-origin__grid {
  display: grid;
  gap: clamp(26px, 4.5vw, 44px);
}

.page-about .about-origin__quote {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(26px, 5.4vw, 40px);
  line-height: 1.28;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.page-about .about-origin__domain {
  margin: 16px 0 0;
  font-family: var(--font-data);
  font-size: clamp(12px, 1.7vw, 15px);
  line-height: 1.6;
  color: var(--clay);
  word-break: break-all;
}

.page-about .about-origin__body p {
  color: var(--deep);
  font-size: 16px;
  line-height: 1.82;
}

.page-about .about-origin__body .section__title {
  margin: 0 0 18px;
}

/* ---------- 年份脊线 ---------- */

.page-about .about-years-section__head {
  margin-bottom: clamp(34px, 5.5vw, 62px);
}

.page-about .about-years-section__lead {
  margin: 16px 0 0;
  max-width: 54ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--stone);
}

.page-about .about-years {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 10px 0 10px 30px;
  display: grid;
  gap: clamp(34px, 5vw, 58px);
}

.page-about .about-years::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 20px;
  bottom: 20px;
  width: 1px;
  background: var(--moss);
  opacity: 0.7;
}

.page-about .about-years__item {
  position: relative;
}

.page-about .about-years__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 16px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px var(--ab-amber-soft);
  transition: box-shadow 260ms var(--ease-out);
}

.page-about .about-years__item:hover::before,
.page-about .about-years__item:focus-within::before {
  box-shadow: 0 0 0 9px var(--ab-amber-soft);
}

.page-about .about-years__year {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-data);
  font-size: clamp(42px, 10.5vw, 78px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.05em;
  color: rgba(243, 240, 230, 0.14);
  -webkit-text-stroke: 2px var(--moss);
  transition: color 260ms var(--ease-out), -webkit-text-stroke-color 260ms var(--ease-out);
}

.page-about .about-years__item:hover .about-years__year,
.page-about .about-years__item:focus-within .about-years__year {
  color: rgba(240, 169, 59, 0.18);
  -webkit-text-stroke-color: var(--amber);
}

.page-about .about-years__title {
  margin: 0 0 10px;
  font-family: var(--font-sans);
  font-size: clamp(19px, 3.1vw, 24px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-years__body p {
  margin: 0;
  max-width: 56ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--stone);
}

.page-about .about-years__figure {
  margin-top: clamp(36px, 6vw, 66px);
}

/* ---------- 产出流程 ---------- */

.page-about .about-flow {
  background: var(--panel);
  border-top: 2px solid var(--ab-hair);
  border-bottom: 2px solid var(--ab-hair);
}

.page-about .about-flow__grid {
  display: grid;
  gap: clamp(32px, 5vw, 60px);
}

.page-about .about-flow__steps {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
}

.page-about .about-flow__step {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 0;
  border-top: 1px solid var(--ab-hair);
}

.page-about .about-flow__step:last-child {
  border-bottom: 1px solid var(--ab-hair);
}

.page-about .about-flow__idx {
  padding-top: 3px;
  font-family: var(--font-data);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--amber);
}

.page-about .about-flow__step h3 {
  margin: 0 0 7px;
  font-family: var(--font-sans);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-flow__step p {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--stone);
}

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

/* ---------- 团队 ---------- */

.page-about .about-team__lead {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--stone);
}

.page-about .about-team__grid {
  margin-top: clamp(30px, 5vw, 48px);
  display: grid;
  gap: 22px;
}

.page-about .about-team__card {
  border: var(--line-strong) solid var(--moss);
  background: var(--panel);
  box-shadow: var(--shadow);
  padding: 20px 18px 22px;
  transition: border-color 220ms var(--ease-out);
}

.page-about .about-team__card[open] {
  border-color: var(--cyan);
}

.page-about .about-team__summary {
  position: relative;
  display: block;
  padding-right: 34px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-team__summary::after {
  content: "+";
  position: absolute;
  top: -2px;
  right: 0;
  font-family: var(--font-data);
  font-size: 22px;
  line-height: 1;
  color: var(--cyan);
  transition: color 200ms var(--ease-out);
}

.page-about .about-team__card[open] .about-team__summary::after {
  content: "–";
}

.page-about .about-team__name {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-sans);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-team__num {
  margin-right: 8px;
  font-family: var(--font-data);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-about .about-team__brief {
  display: block;
  font-size: 14px;
  line-height: 1.7;
  color: var(--stone);
}

.page-about .about-team__body {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--ab-hair);
}

.page-about .about-team__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 三件事 ---------- */

.page-about .about-promise__list {
  list-style: none;
  margin: clamp(28px, 4.5vw, 50px) 0 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .about-promise__item {
  border: var(--line-strong) solid var(--ink);
  background: var(--paper);
  box-shadow: var(--shadow);
  padding: 22px 20px 24px;
}

.page-about .about-promise__num {
  display: block;
  font-family: var(--font-data);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--clay);
}

.page-about .about-promise__item h3 {
  margin: 12px 0 10px;
  font-family: var(--font-sans);
  font-size: 20px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-promise__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--deep);
}

/* ---------- 收束入口 ---------- */

.page-about .about-cta {
  border-top: 3px solid var(--cyan);
}

.page-about .about-cta__inner {
  max-width: 46rem;
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-sans);
  font-size: clamp(26px, 5.2vw, 44px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 16px 0 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--stone);
}

.page-about .about-cta__links {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
    align-items: start;
  }
}

@media (min-width: 780px) {
  .page-about .about-promise__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
    align-items: start;
  }

  .page-about .about-promise__item:nth-child(2) {
    margin-top: 32px;
  }

  .page-about .about-promise__item:nth-child(3) {
    margin-top: 12px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
    column-gap: clamp(48px, 6vw, 96px);
  }

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

  .page-about .about-hero__stat {
    padding: 14px 0;
    border-right: 0;
    border-bottom: 1px solid var(--ab-hair);
  }

  .page-about .about-hero__stat:last-child {
    border-bottom: 0;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    column-gap: clamp(40px, 7vw, 110px);
    align-items: start;
  }

  .page-about .about-years__item {
    display: grid;
    grid-template-columns: minmax(150px, 210px) minmax(0, 1fr);
    column-gap: clamp(28px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-years__year {
    margin-bottom: 0;
  }

  .page-about .about-years__figure {
    width: 62%;
    margin-left: auto;
  }
}

@media (min-width: 960px) {
  .page-about .about-flow__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    column-gap: clamp(40px, 6vw, 88px);
    align-items: start;
  }

  .page-about .about-flow__figure {
    margin-top: clamp(24px, 3vw, 40px);
  }
}

@media (min-width: 1040px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }
}

@media (max-width: 640px) {
  .page-about .about-origin__figure .figure__img {
    aspect-ratio: 16 / 9;
  }

  .page-about .about-hero__stat {
    padding-right: 8px;
  }

  .page-about .about-flow__step {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-years__item::before,
  .page-about .about-years__year,
  .page-about .about-team__card,
  .page-about .about-team__summary::after {
    transition: none;
  }
}