.page-about {
  --about-rail: 176px;
  --about-gap: clamp(24px, 4vw, 58px);
}

.page-about .breadcrumb {
  padding-top: clamp(14px, 2.6vw, 26px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 40px);
  padding: clamp(18px, 3vw, 36px) 0 clamp(34px, 6vw, 80px);
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    align-items: end;
  }
}

.page-about .about-hero__text {
  position: relative;
  min-width: 0;
}

.page-about .about-hero__kicker {
  margin: 0 0 clamp(14px, 2vw, 22px);
}

.page-about .about-hero__title {
  font-family: var(--font-narrow);
  font-size: clamp(34px, 6.4vw, 72px);
  line-height: 1;
  letter-spacing: -0.02em;
  margin: 0 0 clamp(14px, 2vw, 22px);
  color: var(--ink);
  max-width: 19ch;
}

.page-about .about-hero__lede {
  max-width: 54ch;
  margin: 0 0 clamp(18px, 2.4vw, 28px);
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 10px;
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  padding: 0;
  list-style: none;
}

.page-about .about-hero__fact {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 2px 4px;
  padding: 12px 12px 14px;
  border: var(--hairline);
  border-left: 3px solid var(--cyan);
  background: var(--panel);
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-fact__unit {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
}

.page-about .about-fact__label {
  flex: 1 0 100%;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-hero__media {
  margin: 0;
  min-width: 0;
}

.page-about .about-hero__vertical {
  display: none;
}

@media (min-width: 1180px) {
  .page-about .about-hero__vertical {
    display: block;
    position: absolute;
    top: clamp(18px, 3vw, 36px);
    right: 0;
    margin: 0;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.22em;
    color: var(--muted);
  }
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

@media (min-width: 980px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
  }
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  padding: 12px 10px;
  border: var(--hairline);
  background: linear-gradient(180deg, rgba(14, 32, 25, .92), rgba(7, 19, 15, .74));
}

.page-about .about-index__title {
  margin: 0 0 10px;
  padding-left: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-index .toc__link {
  display: block;
  padding: 7px 8px;
  border-left: 2px solid transparent;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

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

.page-about .about-index .toc__link[aria-current] {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(53, 242, 192, .07);
}

@media (max-width: 979px) {
  .page-about .about-index {
    display: flex;
    gap: 6px;
    overflow-x: auto;
    padding: 10px;
    scrollbar-width: none;
  }
  .page-about .about-index::-webkit-scrollbar {
    display: none;
  }
  .page-about .about-index__title {
    display: none;
  }
  .page-about .about-index .toc__link {
    flex: 0 0 auto;
    white-space: nowrap;
    border-left: 0;
    border-bottom: 2px solid transparent;
  }
  .page-about .about-index .toc__link[aria-current] {
    border-left: 0;
    border-bottom-color: var(--cyan);
  }
}

@media (min-width: 980px) {
  .page-about .about-index {
    position: sticky;
    top: 92px;
    align-self: start;
  }
}

/* ---------- 章节骨架 ---------- */
.page-about .about-flow {
  min-width: 0;
}

.page-about .about-flow .section {
  scroll-margin-top: 100px;
}

.page-about .about-flow .section + .section::before {
  content: "";
  display: block;
  height: 9px;
  margin-bottom: clamp(16px, 2.6vw, 26px);
  background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 15px);
}

.page-about .about-flow .section + .section {
  margin-top: clamp(32px, 5vw, 68px);
}

.page-about .section__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--flame);
}

.page-about .section__title {
  font-family: var(--font-narrow);
  font-size: clamp(24px, 3.2vw, 40px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 6px 0 0;
  color: var(--ink);
}

.page-about .section__note {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-copy {
  margin-top: clamp(16px, 2.4vw, 24px);
  max-width: 66ch;
}

.page-about .about-copy p {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--ink);
}

.page-about .about-copy--tight {
  margin-top: clamp(14px, 2vw, 20px);
  padding-left: 14px;
  border-left: 3px solid var(--line);
}

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

/* ---------- 时间线 ---------- */
.page-about .timeline {
  position: relative;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0 0 0 30px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 3px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--score) 62%, var(--flame));
  opacity: .75;
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: clamp(20px, 3vw, 30px);
  scroll-margin-top: 110px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 5px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--bg);
  border: 3px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 242, 192, .13);
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(17px, 2.2vw, 22px);
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .timeline__title {
  margin: 4px 0 8px;
  font-family: var(--font-narrow);
  font-size: clamp(18px, 2.2vw, 24px);
  line-height: 1.2;
  color: var(--ink);
}

.page-about .timeline__text {
  margin: 0;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-growth-media {
  margin: clamp(20px, 3vw, 30px) 0 0;
  border: var(--hairline);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.page-about .about-growth-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-growth-media__cap {
  padding: 10px 14px;
  border-top: var(--hairline);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 团队岗位 ---------- */
.page-about .role-tabs {
  margin-top: clamp(18px, 2.6vw, 26px);
}

.page-about .role-tabs__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.page-about .role-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  padding: clamp(16px, 2.4vw, 26px);
  border: var(--hairline);
  border-top: 3px solid var(--cyan);
  background: var(--panel);
}

.page-about .role-panel[hidden] {
  display: none;
}

@media (min-width: 760px) {
  .page-about .role-panel {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
  }
}

.page-about .role-panel__title {
  grid-column: 1 / -1;
  margin: 0;
  font-family: var(--font-narrow);
  font-size: clamp(18px, 2.2vw, 24px);
  color: var(--ink);
}

.page-about .role-panel__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .role-panel__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .role-panel__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 2px;
  background: var(--cyan);
}

.page-about .role-panel__out {
  margin: 0;
  padding: 12px 14px;
  border-left: 3px solid var(--flame);
  background: rgba(255, 90, 43, .07);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--cyan-soft);
}

.page-about .about-team-media {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  border: var(--hairline);
  background: var(--panel);
}

.page-about .about-team-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-team-media__cap {
  padding: 10px 14px;
  border-top: var(--hairline);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 五步流程 ---------- */
.page-about .flow-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 720px) {
  .page-about .flow-steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 14px;
  }
}

.page-about .flow-step {
  position: relative;
  padding: 15px 14px 14px;
  border: var(--hairline);
  background: var(--panel);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .flow-step:focus {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .flow-step__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--flame);
}

.page-about .flow-step__title {
  margin: 6px 0 0;
  font-family: var(--font-narrow);
  font-size: 17px;
  line-height: 1.25;
  color: var(--ink);
}

.page-about .flow-step__desc {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
}

@media (hover: hover) and (min-width: 720px) {
  .page-about .flow-step__desc {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease), margin-top var(--dur) var(--ease);
  }
  .page-about .flow-step:hover,
  .page-about .flow-step:focus-within,
  .page-about .flow-step:focus {
    border-color: var(--cyan);
    transform: translateY(-3px);
    box-shadow: var(--shadow);
  }
  .page-about .flow-step:hover .flow-step__desc,
  .page-about .flow-step:focus-within .flow-step__desc,
  .page-about .flow-step:focus .flow-step__desc {
    max-height: 200px;
    margin-top: 10px;
    opacity: 1;
  }
}

@media (min-width: 720px) {
  .page-about .flow-step:not(:last-child)::after {
    content: "";
    position: absolute;
    right: -10px;
    top: 38px;
    width: 6px;
    height: 2px;
    background: var(--cyan);
    opacity: .55;
  }
}

/* ---------- 质量与安全 ---------- */
.page-about .quality-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: clamp(18px, 2.6vw, 26px);
}

@media (min-width: 700px) {
  .page-about .quality-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

.page-about .quality-item {
  padding: 16px 16px 18px;
  border: var(--hairline);
  background: var(--panel);
}

.page-about .quality-item__tag {
  display: inline-block;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--bg);
  background: var(--cyan);
}

.page-about .quality-item__title {
  margin: 12px 0 8px;
  font-family: var(--font-narrow);
  font-size: 18px;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .quality-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 合作生态 ---------- */
.page-about .partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: clamp(18px, 2.6vw, 26px);
}

@media (min-width: 700px) {
  .page-about .partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }
}

.page-about .partner-card {
  padding: 16px 16px 18px;
  border: var(--hairline);
  border-top: 3px solid var(--score);
  background: var(--panel);
}

.page-about .partner-card__title {
  margin: 0 0 10px;
  font-family: var(--font-narrow);
  font-size: 17px;
  color: var(--ink);
}

.page-about .partner-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .partner-callout {
  margin-top: 16px;
  padding: clamp(16px, 2.4vw, 26px);
  border: 3px solid var(--cyan);
  background: linear-gradient(135deg, rgba(53, 242, 192, .1), rgba(14, 32, 25, .9) 62%);
  box-shadow: var(--shadow);
}

.page-about .partner-callout__title {
  margin: 0 0 10px;
  font-family: var(--font-narrow);
  font-size: clamp(18px, 2.2vw, 24px);
  color: var(--cyan-soft);
}

.page-about .partner-callout p {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink);
}

/* ---------- 下一步 ---------- */
.page-about .next-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .next-item {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 14px 16px;
  border: var(--hairline);
  background: var(--panel);
}

.page-about .next-item__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--flame);
  padding-top: 3px;
}

.page-about .next-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(18px, 2.6vw, 26px);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .flow-step,
  .page-about .flow-step__desc,
  .page-about .about-index .toc__link {
    transition: none;
  }
  .page-about .flow-step:hover,
  .page-about .flow-step:focus-within,
  .page-about .flow-step:focus {
    transform: none;
  }
}