.page-about .about-lede {
  position: relative;
  overflow: hidden;
  padding: 36px 0 44px;
  border-bottom: 2px solid var(--line);
}

.page-about .about-lede::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(58% 78% at 90% 8%, rgba(44, 232, 216, 0.16), transparent 62%),
    radial-gradient(52% 72% at 4% 96%, rgba(255, 107, 44, 0.14), transparent 60%);
}

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

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

.page-about .about-lede__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.6vw, 62px);
  line-height: 1.07;
  letter-spacing: 0.01em;
  transform: skewX(-2deg);
  transform-origin: left bottom;
  margin: 20px 0 18px;
  max-width: 20ch;
  color: var(--paper);
}

.page-about .about-lede__lead {
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--paper);
  margin: 0 0 28px;
}

.page-about .about-lede__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 2px;
  margin: 0;
  border: 2px solid var(--black);
  background: var(--black);
  box-shadow: var(--shadow-hard);
}

.page-about .stat {
  background: var(--ink-2);
  padding: 16px 18px 18px;
  border-top: 3px solid var(--cyan);
}

.page-about .stat__key {
  font-size: 13px;
  color: var(--mist);
  letter-spacing: 0.08em;
  margin: 0 0 8px;
}

.page-about .stat__val {
  margin: 0;
  font-size: clamp(22px, 4.4vw, 30px);
  color: var(--paper);
  line-height: 1.1;
}

.page-about .about-body {
  padding: 40px 0 0;
}

/* ---- 左栏索引 ---- */
.page-about .about-rail__label {
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--mist);
  margin: 0 0 12px;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__link {
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 12px;
  border: 2px solid var(--line);
  background: var(--ink-2);
  color: var(--paper);
  font-size: 14px;
  text-decoration: none;
  transition: border-color 280ms var(--ease), transform 280ms var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--cyan);
  transform: translateX(2px);
}

.page-about .about-rail__no {
  color: var(--orange);
  font-size: 12px;
}

/* ---- 章节 ---- */
.page-about .about-main {
  min-width: 0;
}

.page-about .about-sec {
  padding-top: 52px;
  scroll-margin-top: 90px;
}

.page-about .about-sec:first-child {
  padding-top: 8px;
}

.page-about .about-sec__intro {
  max-width: 64ch;
  color: var(--paper);
  font-size: 16px;
  line-height: 1.75;
  margin: 18px 0 26px;
}

/* ---- 业务结构 ---- */
.page-about .biz-grid {
  display: grid;
  gap: 18px;
}

.page-about .biz-card {
  position: relative;
  border: 2px solid var(--black);
  box-shadow: var(--shadow-hard);
  padding: 24px 22px 26px;
  background: var(--ink-2);
  overflow: hidden;
}

.page-about .biz-card::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 120px;
  height: 120px;
  background: linear-gradient(135deg, rgba(44, 232, 216, 0.18), transparent 70%);
  clip-path: polygon(100% 0, 0 0, 100% 100%);
}

.page-about .biz-card--arena {
  border-top: 4px solid var(--cyan);
}

.page-about .biz-card--digital {
  border-top: 4px solid var(--orange);
}

.page-about .biz-card--digital::after {
  background: linear-gradient(135deg, rgba(255, 107, 44, 0.2), transparent 70%);
}

.page-about .biz-card__no {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber);
  margin-bottom: 10px;
}

.page-about .biz-card__title {
  font-family: var(--font-display);
  font-size: clamp(22px, 4vw, 28px);
  margin: 0 0 10px;
  color: var(--paper);
}

.page-about .biz-card__text {
  margin: 0 0 16px;
  color: var(--paper);
  line-height: 1.7;
  font-size: 15px;
}

.page-about .biz-card__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .biz-card__list li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 8px;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.6;
}

.page-about .biz-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  background: var(--cyan);
}

/* ---- 三条主线 ---- */
.page-about .spine {
  margin-top: 24px;
  border: 2px solid var(--black);
  background: linear-gradient(150deg, var(--gem-teal), var(--ink-2) 62%);
  box-shadow: var(--shadow-hard);
  padding: 22px 20px 24px;
}

.page-about .spine__lead {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .spine__grid {
  display: grid;
  gap: 18px;
}

.page-about .spine__no {
  display: inline-block;
  font-size: 12px;
  color: var(--black);
  background: var(--cyan);
  padding: 2px 8px;
  margin-bottom: 8px;
}

.page-about .spine__title {
  margin: 0 0 6px;
  font-size: 17px;
  color: var(--paper);
}

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

/* ---- 时间轴 ---- */
.page-about .road-banner {
  margin: 24px 0 30px;
}

.page-about .road-banner img {
  filter: saturate(1.1);
}

.page-about .timeline {
  position: relative;
  display: grid;
  gap: 22px;
  padding-left: 30px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--orange) 55%, rgba(154, 163, 204, 0.2));
}

.page-about .tl-node {
  position: relative;
  border: 2px solid var(--black);
  background: var(--ink-2);
  box-shadow: var(--shadow-soft);
  padding: 18px 18px 20px;
  transition: border-color 300ms var(--ease), transform 300ms var(--ease);
}

.page-about .tl-node:hover,
.page-about .tl-node:focus-within {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .tl-node__dot {
  position: absolute;
  left: -30px;
  top: 22px;
  width: 16px;
  height: 16px;
  background: var(--orange);
  border: 2px solid var(--black);
  box-shadow: 3px 3px 0 var(--black);
}

.page-about .tl-node__stage {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .tl-node__title {
  margin: 0 0 8px;
  font-size: 18px;
  color: var(--paper);
  line-height: 1.3;
}

.page-about .tl-node__sum {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .tl-node__note {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper);
  border-top: 1px solid var(--line-soft);
  padding-top: 10px;
}

/* ---- 团队 ---- */
.page-about .team-grid {
  display: grid;
  gap: 26px;
  margin-top: 22px;
}

.page-about .team-copy .about-sec__intro {
  margin-top: 0;
}

.page-about .role {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.page-about .role:first-of-type {
  border-top: 2px solid var(--cyan);
}

.page-about .role__no {
  font-size: 12px;
  color: var(--orange);
  padding-top: 3px;
}

.page-about .role__title {
  margin: 0 0 6px;
  font-size: 17px;
  color: var(--paper);
}

.page-about .role p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .team-media {
  border: 2px solid var(--black);
  box-shadow: var(--shadow-hard);
  margin: 0;
}

/* ---- 覆盖与节奏 ---- */
.page-about .reach-grid {
  display: grid;
  gap: 24px;
  margin-top: 22px;
}

.page-about .reach-media {
  border: 2px solid var(--black);
  box-shadow: var(--shadow-hard);
  margin: 0;
}

.page-about .reach-facts {
  display: grid;
  gap: 2px;
  background: var(--black);
  border: 2px solid var(--black);
  box-shadow: var(--shadow-hard);
}

.page-about .rf {
  background: var(--ink-2);
  padding: 16px 18px 18px;
  border-left: 3px solid var(--gem-wine);
}

.page-about .rf:nth-child(odd) {
  border-left-color: var(--cyan);
}

.page-about .rf__key {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--amber);
}

.page-about .rf__val {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: clamp(19px, 3.6vw, 24px);
  color: var(--paper);
  line-height: 1.2;
}

.page-about .rf__sub {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--mist);
}

/* ---- 三件事 ---- */
.page-about .creed {
  display: grid;
  gap: 18px;
  margin-top: 22px;
}

.page-about .creed-card {
  border: 2px solid var(--black);
  box-shadow: var(--shadow-hard);
  padding: 22px 20px 24px;
  background: var(--ink-2);
}

.page-about .creed-card--teal {
  background: linear-gradient(158deg, var(--gem-teal), var(--ink-2) 70%);
}

.page-about .creed-card--wine {
  background: linear-gradient(158deg, var(--gem-wine), var(--ink-2) 70%);
}

.page-about .creed-card--ink {
  background: linear-gradient(158deg, var(--ink-2), var(--ink) 75%);
  border-top: 4px solid var(--orange);
}

.page-about .creed-card__no {
  margin: 0 0 10px;
  font-size: 30px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .creed-card--ink .creed-card__no {
  color: var(--orange);
}

.page-about .creed-card__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 22px;
  color: var(--paper);
}

.page-about .creed-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--paper);
}

/* ---- 页尾闭环 ---- */
.page-about .about-close {
  margin-top: 34px;
  border: 2px solid var(--black);
  border-top: 4px solid var(--cyan);
  background: var(--ink-2);
  box-shadow: var(--shadow-hard);
  padding: 24px 20px 26px;
}

.page-about .about-close__code {
  margin: 0 0 10px;
  font-size: 26px;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .about-close__text {
  margin: 0 0 20px;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

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

/* ---- 右侧延伸入口 ---- */
.page-about .aside-panel {
  padding: 20px 18px 22px;
}

.page-about .aside-panel__label {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .linklist a {
  display: block;
  padding: 9px 0;
  color: var(--paper);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.55;
  border-bottom: 1px solid var(--line-soft);
  transition: color 260ms var(--ease), padding-left 260ms var(--ease);
}

.page-about .linklist li:last-child a {
  border-bottom: none;
}

.page-about .linklist a:hover,
.page-about .linklist a:focus-visible {
  color: var(--cyan);
  padding-left: 6px;
}

.page-about .aside-note {
  margin: 14px 0 0;
  font-size: 12px;
  color: var(--mist);
  letter-spacing: 0.06em;
}

/* ---- 响应式 ---- */
@media (min-width: 640px) {
  .page-about .about-lede {
    padding: 44px 0 56px;
  }

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

  .page-about .spine__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-close {
    padding: 28px 26px 30px;
  }
}

@media (min-width: 900px) {
  .page-about .reach-grid {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: 1.12fr 0.88fr;
    align-items: start;
  }

  .page-about .creed {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .timeline {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 14px;
    padding-left: 0;
    padding-top: 34px;
  }

  .page-about .timeline::before {
    left: 0;
    right: 0;
    top: 12px;
    bottom: auto;
    width: auto;
    height: 2px;
    background: linear-gradient(90deg, var(--cyan), var(--orange) 62%, rgba(154, 163, 204, 0.18));
  }

  .page-about .tl-node__dot {
    left: 0;
    top: -28px;
  }

  .page-about .tl-node__note {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    padding-top: 0;
    border-top-color: transparent;
    transition: max-height 420ms var(--ease), opacity 300ms var(--ease),
      padding-top 320ms var(--ease), border-color 320ms var(--ease);
  }

  .page-about .tl-node:hover .tl-node__note,
  .page-about .tl-node:focus-within .tl-node__note {
    max-height: 260px;
    opacity: 1;
    padding-top: 10px;
    border-top-color: var(--line-soft);
  }
}

@media (min-width: 1024px) {
  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    overflow: visible;
    gap: 6px;
    padding-bottom: 0;
  }

  .page-about .about-rail__link {
    white-space: normal;
    border-color: transparent;
    border-left: 2px solid var(--line);
    background: transparent;
    padding: 8px 10px;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-left-color: var(--cyan);
    background: var(--ink-2);
  }

  .page-about .about-sec {
    padding-top: 64px;
  }

  .page-about .about-body {
    padding-top: 52px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .tl-node,
  .page-about .linklist a {
    transition-duration: 150ms;
    transform: none;
  }

  .page-about .about-lede__title {
    transform: none;
  }

  .page-about .tl-node:hover,
  .page-about .tl-node:focus-within {
    transform: none;
  }
}