.page-about {
  --about-edge: rgba(143, 166, 188, 0.35);
  --about-body: rgba(242, 245, 243, 0.82);
  --about-body-strong: rgba(242, 245, 243, 0.92);
  --about-dark-body: rgba(16, 20, 24, 0.78);
  background: var(--ink);
  color: var(--paper);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(22px, 4vw, 40px) 0 clamp(40px, 6vw, 72px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 5vw, 52px);
  margin-top: clamp(22px, 3.5vw, 40px);
}

.page-about .about-hero__lead h1 {
  margin: 14px 0 0;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(32px, 7.6vw, 64px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__intro {
  margin: 18px 0 0;
  max-width: 54ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--about-body);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-hero__panel {
  background: var(--ink-deep);
  border: 2px solid var(--cyan);
  box-shadow: 8px 8px 0 var(--turf);
  padding: clamp(16px, 3vw, 24px);
}

.page-about .about-panel__title {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .about-panel__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-edge);
}

.page-about .about-panel__stats .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: clamp(12px, 2.6vw, 18px);
  background: var(--ink-deep);
}

.page-about .about-panel__stats .stat__value {
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(26px, 5vw, 34px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-panel__stats .stat--flare .stat__value {
  color: var(--flare);
}

.page-about .about-panel__stats .stat__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--steel-light);
}

/* ---------- 通用段落文字 ---------- */
.page-about .about-lede {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--about-body);
}

.page-about .about-link {
  color: var(--cyan);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-link:hover {
  color: var(--cyan-soft);
}

/* ---------- 三层标注 ---------- */
.page-about .about-layers {
  margin-top: clamp(26px, 4vw, 44px);
  border-top: 2px solid var(--steel);
}

.page-about .about-layer {
  display: grid;
  gap: 10px;
  padding: clamp(20px, 3.4vw, 28px) 0;
  border-bottom: 2px solid var(--steel);
}

.page-about .about-layer__num {
  font-family: var(--mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--amber);
}

.page-about .about-layer__title {
  margin: 0;
  font-size: clamp(21px, 3.4vw, 28px);
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-layer__desc {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--about-body);
}

.page-about .about-audience {
  margin-top: clamp(28px, 4.5vw, 48px);
  padding: clamp(22px, 3.6vw, 34px);
  background: var(--ink);
  border: 2px solid var(--cyan);
  border-left-width: 10px;
}

.page-about .about-audience__title {
  margin: 0 0 16px;
  font-size: clamp(19px, 3vw, 24px);
  font-weight: 900;
  color: var(--paper);
}

.page-about .about-audience__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-audience__list li {
  position: relative;
  padding-left: 22px;
  font-size: 16px;
  line-height: 1.7;
  color: var(--about-body-strong);
}

.page-about .about-audience__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 10px;
  height: 10px;
  background: var(--cyan);
}

/* ---------- 工作流 ---------- */
.page-about .about-workflow__figure {
  margin: clamp(24px, 4vw, 40px) 0 clamp(28px, 4.5vw, 44px);
}

.page-about .about-steps .tabs__list,
.page-about .about-team__tabs .tabs__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.page-about .about-steps .tabs__tab,
.page-about .about-team__tabs .tabs__tab {
  appearance: none;
  border: 2px solid var(--steel);
  border-radius: 0;
  background: var(--turf);
  color: var(--paper);
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.04em;
  padding: 14px 18px;
  text-align: left;
  cursor: pointer;
}

.page-about .about-steps .tabs__tab[aria-selected="true"],
.page-about .about-team__tabs .tabs__tab[aria-selected="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}

.page-about .about-steps .tabs__tab:focus-visible,
.page-about .about-team__tabs .tabs__tab:focus-visible {
  outline: 3px solid var(--cyan-soft);
  outline-offset: 2px;
}

.page-about .about-steps .tabs__panel {
  margin-top: 14px;
  padding: clamp(20px, 3.4vw, 32px);
  background: var(--ink-deep);
  border: 2px solid var(--steel);
  border-top: 6px solid var(--cyan);
}

.page-about .about-step__num {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .about-step__title {
  margin: 0 0 10px;
  font-size: clamp(21px, 3.2vw, 28px);
  font-weight: 900;
  color: var(--paper);
}

.page-about .about-step__text {
  margin: 0;
  max-width: 70ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--about-body);
}

/* ---------- 发展历程 ---------- */
.page-about .about-history__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(24px, 4vw, 42px);
}

.page-about .about-history__figure,
.page-about .about-partners__figure {
  margin: 0;
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 3px;
  background: var(--cyan);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: clamp(26px, 4vw, 40px);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__node {
  position: absolute;
  left: -30px;
  top: 4px;
  width: 14px;
  height: 14px;
  background: var(--wine);
  border: 2px solid var(--paper);
}

.page-about .about-timeline__phase {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(20px, 3.2vw, 26px);
  line-height: 1.32;
  color: var(--paper);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--about-body);
}

/* ---------- 团队构成 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  margin-top: clamp(24px, 4vw, 42px);
}

.page-about .team-bar {
  margin-bottom: 18px;
}

.page-about .team-bar__label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .team-bar__value {
  font-family: var(--mono);
  color: var(--cyan);
}

.page-about .team-bar__track {
  display: block;
  height: 16px;
  background: var(--ink-deep);
  border: 2px solid var(--steel);
}

.page-about .team-bar__fill {
  display: block;
  height: 100%;
}

.page-about .team-bar__fill--a {
  width: 46%;
  background: var(--cyan);
}

.page-about .team-bar__fill--b {
  width: 30%;
  background: var(--amber);
}

.page-about .team-bar__fill--c {
  width: 24%;
  background: var(--flare);
}

.page-about .about-team__tabs .tabs__panel {
  margin-top: 14px;
  padding: clamp(18px, 3vw, 28px);
  background: var(--turf);
  border: 2px solid var(--cyan);
}

.page-about .about-team__panel-title {
  margin: 0 0 8px;
  font-size: clamp(19px, 3vw, 24px);
  font-weight: 900;
  color: var(--paper);
}

.page-about .about-team__panel-title span {
  margin-left: 8px;
  font-family: var(--mono);
  font-size: 15px;
  color: var(--cyan);
}

.page-about .about-team__panel-text {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--about-body);
}

/* ---------- 合作与认可（浅底） ---------- */
.page-about .about-partners {
  background: var(--paper);
  color: var(--near-black);
}

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

.page-about .about-partners .section-title {
  color: var(--near-black);
}

.page-about .about-partners .about-lede {
  color: var(--about-dark-body);
}

.page-about .about-partners .about-link {
  color: var(--wine);
}

.page-about .about-partners .figure__caption {
  color: var(--about-dark-body);
}

.page-about .about-partners__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-partner {
  padding: clamp(16px, 2.6vw, 22px) 0;
  border-top: 2px solid var(--near-black);
}

.page-about .about-partner:last-child {
  border-bottom: 2px solid var(--near-black);
}

.page-about .about-partner__title {
  margin: 0 0 6px;
  font-size: clamp(18px, 2.8vw, 21px);
  font-weight: 900;
  color: var(--near-black);
}

.page-about .about-partner__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.72;
  color: var(--about-dark-body);
}

/* ---------- 服务承诺 ---------- */
.page-about .about-promise__list {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  border-bottom: 2px solid var(--steel);
}

.page-about .promise-item {
  padding: clamp(18px, 3vw, 26px) 0;
  border-top: 2px solid var(--steel);
}

.page-about .promise-item__head {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0;
}

.page-about .promise-item__num {
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(36px, 7vw, 52px);
  line-height: 1;
  color: var(--flare);
}

.page-about .promise-item__unit {
  font-family: var(--mono);
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .promise-item__text {
  margin: 10px 0 0;
  font-size: 16px;
  line-height: 1.72;
  color: var(--about-body);
}

.page-about .about-promise__foot {
  margin-top: clamp(26px, 4vw, 40px);
  padding: clamp(20px, 3.2vw, 30px);
  background: var(--turf);
  border: 2px solid var(--cyan);
  border-left-width: 10px;
}

.page-about .about-promise__foot p {
  margin: 0 0 12px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--about-body-strong);
}

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

.page-about .about-promise__mail {
  font-family: var(--mono);
  color: var(--cyan);
}

/* ---------- 图片 ---------- */
.page-about .figure__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 中屏 ---------- */
@media (min-width: 768px) {
  .page-about .about-layer {
    grid-template-columns: 80px 200px minmax(0, 1fr);
    align-items: baseline;
    gap: 10px 24px;
  }

  .page-about .about-audience__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px 28px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-steps .tabs__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 6px;
  }

  .page-about .about-steps .tabs__tab {
    text-align: center;
    padding: 16px 22px;
    clip-path: polygon(14px 0, 100% 0, calc(100% - 14px) 100%, 0 100%);
  }

  .page-about .about-history__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

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

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-promise__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    column-gap: clamp(20px, 3vw, 36px);
  }

  .page-about .about-promise__list .promise-item {
    padding-right: clamp(10px, 2vw, 22px);
  }
}
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