.page-about {
  background: var(--bg-deep);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: 10px;
}

.page-about .about-hero-grid {
  margin-top: 26px;
  row-gap: 40px;
  align-items: start;
}

.page-about .about-h1 {
  font-size: clamp(30px, 6.2vw, 56px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 12px 0 0;
}

.page-about .about-hero-main .lead {
  margin-top: 20px;
  font-size: 17px;
  line-height: 1.8;
  color: var(--ink);
  max-width: 62ch;
}

.page-about .about-hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 26px;
  margin-top: 26px;
}

.page-about .about-rail {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--line);
}

.page-about .about-rail li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .rail-num {
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .rail-label {
  font-family: var(--font-narrow);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  text-align: right;
}

@media (min-width: 980px) {
  .page-about .about-hero-main {
    grid-column: 6 / 13;
    grid-row: 1;
  }
  .page-about .about-rail-wrap {
    grid-column: 1 / 5;
    grid-row: 1;
    padding-top: 6px;
  }
}

/* ---------- 通用标题 ---------- */
.page-about .about-h2 {
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.24;
  letter-spacing: -0.005em;
  margin: 10px 0 0;
}

.page-about .about-section-head {
  margin-bottom: 32px;
}

.page-about .about-section-head .about-h2 {
  max-width: 20em;
}

/* ---------- 品牌起点 ---------- */
.page-about .about-split {
  row-gap: 22px;
}

.page-about .about-figure {
  margin: 40px 0 0;
}

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

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--line);
}

.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 20px 0 20px 0;
  border-bottom: 1px solid var(--line);
  transition: padding-left 0.22s ease, background 0.22s ease;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--cyan);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.22s ease;
}

.page-about .tl-item:hover::before,
.page-about .tl-item:focus-within::before {
  transform: scaleY(1);
}

.page-about .tl-item:hover,
.page-about .tl-item:focus-within {
  padding-left: 16px;
  background: linear-gradient(90deg, rgba(61, 245, 208, 0.08), transparent 68%);
}

.page-about .tl-year {
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .tl-title {
  margin: 8px 0 6px;
  font-family: var(--font-narrow);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.page-about .tl-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 62ch;
}

@media (min-width: 768px) {
  .page-about .tl-item {
    grid-template-columns: 150px 1fr;
    gap: 30px;
    align-items: start;
    padding: 26px 0;
  }
  .page-about .tl-year {
    font-size: 42px;
  }
  .page-about .tl-title {
    margin-top: 0;
  }
}

/* ---------- 成都运营中心 ---------- */
.page-about .about-center-grid {
  row-gap: 32px;
}

.page-about .about-center-grid .lead {
  font-size: 17px;
  line-height: 1.8;
  color: var(--ink);
  margin-bottom: 16px;
  max-width: 58ch;
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(118px, 1fr));
  gap: 1px;
  margin-top: 26px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .fig {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px;
  background: var(--bg-panel);
}

.page-about .fig-num {
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

.page-about .fig-label {
  font-size: 12px;
  line-height: 1.55;
  letter-spacing: 0.03em;
  color: var(--muted);
}

/* ---------- 团队职能分段切换 ---------- */
.page-about .about-tabs {
  margin-top: 36px;
}

.page-about .about-tabs .tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-tabs .tab {
  font-family: var(--font-narrow);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 10px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.page-about .about-tabs .tab:hover {
  border-color: var(--cyan);
  color: var(--ink);
}

.page-about .about-tabs .tab[aria-selected="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--bg-deep);
}

.page-about .about-tabs .tab[aria-selected="true"]:hover {
  color: var(--bg-deep);
}

.page-about .about-tabs .tab:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.page-about .tabpanel {
  max-width: 68ch;
  padding: 22px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 内容生产流水线 ---------- */
.page-about .about-flow-grid {
  row-gap: 36px;
}

.page-about .flow {
  display: flex;
  flex-direction: column;
}

.page-about .flow-step {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.page-about .flow-step:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .flow-num {
  font-size: 21px;
  font-weight: 700;
  line-height: 1;
  padding-top: 4px;
  color: var(--cyan);
}

.page-about .flow-title {
  margin: 0 0 6px;
  font-family: var(--font-narrow);
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .flow-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .flow-arrow {
  display: none;
  color: var(--line);
}

@media (min-width: 768px) {
  .page-about .flow-arrow {
    display: flex;
    align-items: center;
    padding: 0 0 0 15px;
  }
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco-grid {
  row-gap: 34px;
}

.page-about .about-eco-grid .prose {
  margin-top: 18px;
}

.page-about .eco-group + .eco-group {
  margin-top: 30px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.page-about .eco-title {
  margin: 0 0 16px;
  font-family: var(--font-narrow);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .eco-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .eco-list li {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 16px;
  align-items: baseline;
}

.page-about .eco-num {
  font-size: 25px;
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

.page-about .eco-list li > span:last-child {
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .eco-tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 服务承诺与联系 ---------- */
.page-about .about-connect-band {
  display: flex;
  flex-direction: column;
  gap: 26px;
  padding: 28px 22px;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(232, 180, 90, 0.12), transparent 58%),
    var(--bg-panel);
  box-shadow: var(--shadow-hard);
}

.page-about .about-connect-lead {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 58ch;
}

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

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

.page-about .about-promises li {
  display: grid;
  gap: 6px;
  padding: 18px 16px;
  background: var(--bg-deep);
}

.page-about .about-promises .mono {
  font-size: 17px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-promises p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

@media (min-width: 760px) {
  .page-about .about-promises {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-connect-band {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
    gap: 40px;
    padding: 40px 38px;
  }
  .page-about .about-connect-band > div:first-child {
    max-width: 60%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-item,
  .page-about .tl-item::before,
  .page-about .about-tabs .tab {
    transition: none;
  }
}