.page-about,
.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about {
  --ab-line: rgba(44, 66, 87, .72);
  --ab-line-soft: rgba(44, 66, 87, .48);
  background: var(--sea-deep);
  color: var(--text-body);
  font-family: var(--font-sans);
  overflow-x: clip;
}

.page-about h2 {
  margin: 0;
  font-size: clamp(24px, 4.6vw, 40px);
  line-height: 1.16;
  font-weight: 800;
  letter-spacing: -.015em;
  color: var(--paper);
}

.page-about .prose p {
  color: var(--text-body);
}

.page-about .ab-note-text {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .ab-head {
  max-width: 760px;
  margin-bottom: 34px;
}

.page-about .ab-head .eyebrow {
  display: inline-block;
  margin-bottom: 12px;
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  padding: calc(var(--header-h) + 44px) 0 40px;
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -200px;
  right: -170px;
  width: min(780px, 100vw);
  height: 640px;
  background:
    radial-gradient(circle at 32% 34%, rgba(35, 181, 224, .22), transparent 62%),
    radial-gradient(circle at 74% 62%, rgba(255, 106, 69, .14), transparent 60%);
  transform: skewY(-7deg);
  pointer-events: none;
}

.page-about .breadcrumb {
  margin-bottom: 30px;
  font-size: 13px;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--text-dim);
}

.page-about .breadcrumb-list a {
  color: var(--aqua-soft);
  text-decoration: none;
  transition: color .22s var(--ease-out);
}

.page-about .breadcrumb-list a:hover,
.page-about .breadcrumb-list a:focus-visible {
  color: var(--aqua);
  text-decoration: underline;
}

.page-about .breadcrumb-list li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--slate);
}

.page-about .ab-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .ab-hero-main .eyebrow {
  display: inline-block;
  margin-bottom: 14px;
}

.page-about .ab-hero h1 {
  margin: 0;
  font-size: clamp(30px, 6.4vw, 62px);
  line-height: 1.07;
  font-weight: 900;
  letter-spacing: -.025em;
  color: var(--paper);
  max-width: 20ch;
}

.page-about .ab-lede {
  max-width: 50ch;
  margin: 20px 0 0;
  font-size: 16.5px;
  line-height: 1.82;
  color: var(--text-body);
}

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

.page-about .ab-hero-aside {
  padding: 24px 22px;
  border: 1px solid var(--ab-line);
  border-radius: var(--radius-lg) var(--radius-lg) var(--radius-lg) 4px;
  background: linear-gradient(158deg, rgba(14, 37, 55, .94), rgba(7, 26, 43, .88));
}

.page-about .ab-aside-label {
  margin: 0;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--aqua-soft);
}

.page-about .ab-big {
  display: block;
  margin: 8px 0 18px;
  font-family: var(--font-mono);
  font-size: clamp(40px, 9vw, 56px);
  line-height: 1;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .ab-aside-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 16px 0 0;
  list-style: none;
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-aside-list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  font-size: 14px;
}

.page-about .ab-k {
  color: var(--text-dim);
}

.page-about .ab-v {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--coral-soft);
  white-space: nowrap;
}

.page-about .ab-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 40px;
  padding-top: 22px;
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-jump a {
  display: inline-block;
  padding: 7px 14px;
  border: 1px solid var(--ab-line);
  border-radius: var(--radius-pill);
  font-size: 13px;
  color: var(--text-dim);
  text-decoration: none;
  transition: color .24s var(--ease-out), border-color .24s var(--ease-out), background-color .24s var(--ease-out);
}

.page-about .ab-jump a:hover,
.page-about .ab-jump a:focus-visible {
  color: var(--paper);
  border-color: var(--aqua);
  background: rgba(35, 181, 224, .12);
}

/* ---------- 区块骨架 ---------- */

.page-about .ab-section {
  position: relative;
  padding: 60px 0;
}

.page-about .ab-rail {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
}

.page-about .ab-rail-note h2 {
  margin-top: 12px;
}

.page-about .ab-rail-note .eyebrow {
  display: inline-block;
}

.page-about .ab-rail-media {
  margin: 26px 0 0;
  border-radius: var(--radius-lg) 4px var(--radius-lg) var(--radius-lg);
}

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

/* ---------- 时间线 ---------- */

.page-about .tl-list {
  position: relative;
  display: grid;
  gap: 18px;
  margin: 0;
  padding: 0 0 0 28px;
  list-style: none;
}

.page-about .tl-list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--aqua) 0%, var(--aqua-soft) 40%, var(--coral) 72%, var(--lime) 100%);
  opacity: .55;
}

.page-about .tl-node {
  position: relative;
}

.page-about .tl-dot {
  position: absolute;
  left: -29px;
  top: 24px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 3px solid var(--sea-deep);
  background: var(--aqua);
  box-shadow: 0 0 0 1px rgba(35, 181, 224, .8);
}

.page-about .tl-card {
  border: 1px solid var(--ab-line);
  border-radius: 4px var(--radius-md) var(--radius-md) var(--radius-md);
  background: linear-gradient(150deg, rgba(14, 37, 55, .92), rgba(7, 26, 43, .86));
  transition: border-color .26s var(--ease-out), transform .26s var(--ease-out);
}

.page-about .tl-card:hover,
.page-about .tl-card:focus-within {
  border-color: rgba(35, 181, 224, .55);
  transform: translateY(-2px);
}

.page-about .tl-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  width: 100%;
  margin: 0;
  padding: 18px 20px 6px;
  background: none;
  border: 0;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .tl-year {
  flex: none;
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 700;
  color: var(--coral);
  letter-spacing: .01em;
}

.page-about .tl-name {
  flex: 1 1 auto;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.42;
  color: var(--paper);
}

.page-about .tl-cue {
  flex: none;
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(35, 181, 224, .45);
  border-radius: 50%;
  font-size: 14px;
  line-height: 1;
  color: var(--aqua-soft);
  transition: transform .26s var(--ease-out), border-color .26s var(--ease-out);
}

.page-about .tl-head[aria-expanded="true"] .tl-cue {
  transform: rotate(45deg);
  border-color: var(--coral);
  color: var(--coral);
}

.page-about .tl-brief {
  margin: 0;
  padding: 0 20px 18px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-dim);
}

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

.page-about .tl-panel {
  margin: 0 20px 18px;
  padding: 14px 16px;
  border-left: 2px solid var(--lime);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: rgba(184, 242, 74, .06);
  font-size: 14px;
  line-height: 1.72;
  color: var(--text-body);
}

.page-about .tl-panel p {
  margin: 0;
}

.page-about .tl-card:hover .tl-panel,
.page-about .tl-card:focus-within .tl-panel {
  display: block;
}

/* ---------- 团队 ---------- */

.page-about .ab-team-media {
  margin: 0 0 34px;
  border-radius: var(--radius-lg) 4px 4px var(--radius-lg);
}

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

.page-about .ab-crew {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .ab-crew-block {
  --ab-accent: var(--aqua);
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 26px 22px 22px;
  border: 1px solid var(--ab-line);
  border-radius: var(--radius-md);
  background: linear-gradient(165deg, rgba(14, 37, 55, .9), rgba(7, 26, 43, .74));
  transition: border-color .28s var(--ease-out), transform .28s var(--ease-out);
}

.page-about .ab-crew-block--b {
  --ab-accent: var(--coral);
}

.page-about .ab-crew-block--c {
  --ab-accent: var(--lime);
}

.page-about .ab-crew-block::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 58px;
  height: 3px;
  border-radius: 0 0 3px 0;
  background: var(--ab-accent);
}

.page-about .ab-crew-block:hover,
.page-about .ab-crew-block:focus-within {
  border-color: rgba(35, 181, 224, .5);
  transform: translateY(-3px);
}

.page-about .ab-crew-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 12px;
  padding: 0;
  background: none;
  border: 0;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .ab-crew-idx {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--ab-accent, var(--aqua));
}

.page-about .ab-crew-name {
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .ab-crew-line {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-dim);
}

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

.page-about .ab-crew-panel {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed var(--ab-line);
  font-size: 14px;
  line-height: 1.72;
  color: var(--text-body);
}

.page-about .ab-crew-panel p {
  margin: 0;
}

.page-about .ab-crew-block:hover .ab-crew-panel,
.page-about .ab-crew-block:focus-within .ab-crew-panel {
  display: block;
}

/* ---------- 校对流程 ---------- */

.page-about .ab-band {
  position: relative;
  margin: 0 0 34px;
  border-radius: var(--radius-lg) 4px var(--radius-lg) var(--radius-lg);
  overflow: hidden;
}

.page-about .ab-band img {
  display: block;
  width: 100%;
  height: clamp(150px, 26vw, 240px);
  object-fit: cover;
  opacity: .55;
}

.page-about .ab-band::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(7, 26, 43, .95), rgba(7, 26, 43, .22) 55%, rgba(7, 26, 43, .95));
  pointer-events: none;
}

.page-about .pr-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .pr-step {
  position: relative;
  padding: 24px 22px;
  border: 1px solid var(--ab-line);
  border-radius: var(--radius-md);
  background: rgba(14, 37, 55, .62);
}

.page-about .pr-num {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--lime);
}

.page-about .pr-step h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .pr-step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--text-dim);
}

/* ---------- 服务对象 ---------- */

.page-about .ab-reach-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .ab-reach-lead h2 {
  margin-top: 12px;
}

.page-about .ab-reach-lead .eyebrow {
  display: inline-block;
}

.page-about .ab-reach-lead .btn {
  margin-top: 24px;
}

.page-about .ab-client {
  padding: 22px 0;
  border-top: 1px solid var(--ab-line);
}

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

.page-about .ab-client-top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 10px;
}

.page-about .ab-client-count {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--coral);
}

.page-about .ab-client-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-client p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text-dim);
}

/* ---------- 术语标准 ---------- */

.page-about .ab-dict {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .ab-dict-item {
  position: relative;
  padding: 22px 20px;
  border: 1px solid var(--ab-line);
  border-left: 3px solid var(--aqua);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: rgba(14, 37, 55, .55);
}

.page-about .ab-dict-tag {
  display: inline-block;
  margin-bottom: 10px;
}

.page-about .ab-dict-term {
  display: block;
  margin-bottom: 8px;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .ab-dict-item > p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--text-dim);
}

.page-about .ab-dict-btn {
  margin-top: 14px;
  padding: 6px 14px;
  border: 1px solid rgba(35, 181, 224, .42);
  border-radius: var(--radius-pill);
  background: none;
  color: var(--aqua-soft);
  font: inherit;
  font-size: 13px;
  cursor: pointer;
  transition: color .24s var(--ease-out), border-color .24s var(--ease-out), background-color .24s var(--ease-out);
}

.page-about .ab-dict-btn:hover,
.page-about .ab-dict-btn:focus-visible {
  color: var(--paper);
  border-color: var(--aqua);
  background: rgba(35, 181, 224, .12);
}

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

.page-about .ab-dict-panel {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed var(--ab-line);
  font-size: 14px;
  line-height: 1.72;
  color: var(--text-body);
}

.page-about .ab-dict-panel p {
  margin: 0;
}

.page-about .ab-dict-item:hover .ab-dict-panel,
.page-about .ab-dict-item:focus-within .ab-dict-panel {
  display: block;
}

/* ---------- 赛季节奏 ---------- */

.page-about .ab-rhythm {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .ab-rhythm-item {
  padding: 24px 22px;
  border: 1px solid rgba(35, 181, 224, .3);
  border-radius: var(--radius-md);
  background: linear-gradient(140deg, rgba(35, 181, 224, .16), rgba(14, 37, 55, .72) 62%);
}

.page-about .ab-rhythm-item:nth-child(2) {
  border-color: rgba(255, 106, 69, .3);
  background: linear-gradient(140deg, rgba(255, 106, 69, .16), rgba(14, 37, 55, .72) 62%);
}

.page-about .ab-rhythm-item:nth-child(3) {
  border-color: rgba(184, 242, 74, .28);
  background: linear-gradient(140deg, rgba(184, 242, 74, .14), rgba(14, 37, 55, .72) 62%);
}

.page-about .ab-rhythm-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 36px;
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
}

.page-about .ab-rhythm-label {
  display: block;
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.62;
  color: var(--text-dim);
}

.page-about .ab-rhythm-note {
  margin-top: 24px;
}

.page-about .ab-rhythm + .btn {
  margin-top: 22px;
}

/* ---------- 合作入口 ---------- */

.page-about .ab-cta {
  padding-bottom: 96px;
}

.page-about .ab-cta-inner {
  position: relative;
  padding: 40px 26px;
  border: 1px solid rgba(35, 181, 224, .34);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at 88% 16%, rgba(255, 106, 69, .22), transparent 55%),
    linear-gradient(150deg, rgba(35, 181, 224, .15), rgba(7, 26, 43, .92) 58%);
  overflow: hidden;
}

.page-about .ab-cta-inner .eyebrow {
  display: inline-block;
  margin-bottom: 12px;
}

.page-about .ab-cta-text {
  max-width: 56ch;
  margin: 16px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text-body);
}

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

/* ---------- 焦点可见 ---------- */

.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 中屏 ---------- */

@media (min-width: 720px) {
  .page-about .ab-rhythm {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .ab-cta-inner {
    padding: 52px 46px;
  }
}

/* ---------- 桌面 ---------- */

@media (min-width: 900px) {
  .page-about .ab-hero {
    padding: calc(var(--header-h) + 72px) 0 52px;
  }

  .page-about .ab-hero-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 40px;
    align-items: start;
  }

  .page-about .ab-hero-main {
    grid-column: 1 / span 8;
  }

  .page-about .ab-hero-aside {
    grid-column: 10 / span 3;
  }

  .page-about .ab-section {
    padding: 88px 0;
  }

  .page-about .ab-rail {
    grid-template-columns: 320px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-rail-note {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .ab-reach-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-reach-lead {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .ab-crew {
    grid-template-columns: 1.28fr .98fr .82fr;
    gap: 20px;
    align-items: stretch;
  }

  .page-about .pr-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .pr-step::after {
    content: "";
    position: absolute;
    top: 50%;
    right: -20px;
    width: 20px;
    height: 1px;
    background: var(--aqua);
    opacity: .6;
  }

  .page-about .pr-step:last-child::after {
    display: none;
  }

  .page-about .ab-dict {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 1180px) {
  .page-about .ab-hero-main {
    grid-column: 1 / span 7;
  }

  .page-about .ab-hero-aside {
    grid-column: 9 / span 3;
  }
}

/* ---------- 动效收敛 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-card,
  .page-about .ab-crew-block,
  .page-about .ab-jump a,
  .page-about .ab-dict-btn,
  .page-about .tl-cue {
    transition: none;
  }

  .page-about .tl-card:hover,
  .page-about .ab-crew-block:hover,
  .page-about .tl-card:focus-within,
  .page-about .ab-crew-block:focus-within {
    transform: none;
  }
}