/* ============ 品牌文化 / 页面作用域 ============ */
.page-about {
  --ab-rail-w: 108px;
  --ab-ink-soft: rgba(255, 255, 255, 0.82);
  --ab-hairline-dark: rgba(255, 255, 255, 0.16);
  background: var(--paper-050);
  color: var(--text);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(2.75rem, 7vw, 5.5rem) clamp(3.25rem, 8vw, 6.5rem);
  background: linear-gradient(150deg, var(--teal-800) 0%, var(--indigo-700) 58%, var(--ink-900) 100%);
  color: #fff;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.055) 1px, transparent 1px);
  background-size: 78px 78px;
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  right: -18%;
  bottom: -42%;
  width: 60%;
  aspect-ratio: 1 / 1;
  z-index: -1;
  background: var(--wine-700);
  opacity: 0.38;
  border-radius: 44% 56% 62% 38% / 52% 38% 62% 48%;
  transform: rotate(-12deg);
  pointer-events: none;
}

.page-about .ab-hero__inner {
  position: relative;
}

.page-about .ab-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 1.1rem;
  font-size: var(--fs-meta);
  letter-spacing: 0.14em;
  color: var(--mint-200);
}

.page-about .ab-eyebrow::before {
  content: "";
  width: 34px;
  height: 2px;
  background: var(--orange-500);
}

.page-about .ab-hero__title {
  margin: 0 0 1.35rem;
  max-width: 15ch;
  color: #fff;
  font-size: clamp(2.4rem, 7.2vw, 5.2rem);
  line-height: 0.98;
  letter-spacing: -0.02em;
  font-weight: 900;
}

.page-about .ab-hero__lead {
  max-width: 56ch;
  margin: 0 0 2.2rem;
  font-size: clamp(1rem, 1.4vw, 1.14rem);
  line-height: 1.78;
  color: var(--ab-ink-soft);
}

.page-about .ab-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(1.25rem, 5vw, 3.25rem);
  margin: 0;
  padding: 1.5rem 0 0;
  list-style: none;
  border-top: 1px solid var(--ab-hairline-dark);
}

.page-about .ab-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 0.28rem;
  max-width: 20ch;
}

.page-about .ab-hero__facts strong {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.2vw, 2.15rem);
  font-weight: 700;
  line-height: 1;
  color: var(--orange-500);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-hero__facts span {
  font-size: var(--fs-meta);
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.7);
}

.page-about .ab-hero__vnote {
  position: absolute;
  top: 50%;
  right: clamp(0.9rem, 2.6vw, 2.25rem);
  transform: translateY(-50%);
  writing-mode: vertical-rl;
  margin: 0;
  color: rgba(255, 255, 255, 0.4);
  pointer-events: none;
}

/* ---------- 面包屑 ---------- */
.page-about .ab-crumb {
  padding-block: 0.9rem;
  background: var(--paper-050);
  border-bottom: 1px solid var(--line);
}

/* ---------- 画布与左索引 ---------- */
.page-about .ab-canvas {
  max-width: var(--maxw);
  margin-inline: auto;
  padding: clamp(1.75rem, 4vw, 3rem) var(--gutter) clamp(3rem, 7vw, 6rem);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
}

.page-about .ab-rail {
  display: none;
}

.page-about .ab-rail__cap {
  margin: 0 0 0.85rem;
  padding-left: 0.55rem;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--gray-600);
}

.page-about .ab-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-rail__link {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.5rem 0.55rem;
  border-left: 2px solid var(--line);
  color: var(--text-muted);
  font-size: 0.82rem;
  line-height: 1.4;
  text-decoration: none;
  transition: color 0.16s var(--ease-out), border-color 0.16s var(--ease-out), background 0.16s var(--ease-out);
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  color: var(--tech-blue-500);
  border-left-color: var(--orange-500);
  background: rgba(30, 107, 255, 0.06);
}

.page-about .ab-rail__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--gray-600);
}

.page-about .ab-rail__link:hover .ab-rail__num,
.page-about .ab-rail__link:focus-visible .ab-rail__num {
  color: var(--orange-500);
}

/* ---------- 正文区块 ---------- */
.page-about .ab-block {
  padding-block: clamp(1.75rem, 4vw, 3rem);
  border-top: 1px solid var(--line);
}

.page-about .ab-block:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .ab-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-bottom: 1.3rem;
}

.page-about .ab-head__no {
  padding: 0.16rem 0.5rem;
  border-radius: var(--radius-s);
  background: rgba(122, 31, 53, 0.1);
  color: var(--wine-700);
  font-size: var(--fs-meta);
  letter-spacing: 0.1em;
}

.page-about .ab-head__title {
  margin: 0;
  font-size: var(--fs-h2);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.015em;
}

.page-about .ab-body {
  max-width: 62ch;
}

.page-about .ab-body p {
  margin: 0 0 1rem;
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--text);
}

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

.page-about .ab-lead {
  font-size: clamp(1.08rem, 1.7vw, 1.28rem) !important;
  font-weight: 600;
  line-height: 1.65 !important;
  color: var(--indigo-700) !important;
}

.page-about .ab-intro {
  margin: 0 0 1.5rem;
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--text-muted);
}

.page-about .ab-outro {
  margin: 1.5rem 0 0;
  padding-left: 1rem;
  border-left: 3px solid var(--orange-500);
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--text);
}

.page-about .ab-pull {
  position: relative;
  margin: 1.75rem 0 0;
  padding: 1.35rem 1.5rem 1.35rem 1.75rem;
  background: var(--sand-200);
  border-radius: var(--radius-m);
}

.page-about .ab-pull::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  border-radius: var(--radius-m) 0 0 var(--radius-m);
  background: linear-gradient(180deg, var(--tech-blue-500), var(--wine-700));
}

.page-about .ab-pull p {
  margin: 0;
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  font-weight: 700;
  line-height: 1.6;
  color: var(--ink-900);
}

/* ---------- 深色区块：内容工坊的一天 ---------- */
.page-about .ab-block--dark {
  background: var(--ink-900);
  color: #fff;
  border-top: 0;
  border-radius: var(--radius-m);
  padding: clamp(1.75rem, 4vw, 3rem);
  margin-block: clamp(1.5rem, 4vw, 2.75rem);
}

.page-about .ab-block--dark .ab-head__title {
  color: #fff;
}

.page-about .ab-block--dark .ab-head__no {
  background: rgba(191, 227, 220, 0.14);
  color: var(--mint-200);
}

.page-about .ab-block--dark .ab-flowlist__body p {
  color: var(--ab-ink-soft);
}

.page-about .ab-figure {
  margin: 0 0 1.75rem;
}

.page-about .ab-block--dark .lb-media__caption {
  color: rgba(255, 255, 255, 0.6);
}

/* ---------- 工作流时间轴 ---------- */
.page-about .ab-flowlist {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-flowlist__item {
  position: relative;
  display: grid;
  grid-template-columns: 3.5rem minmax(0, 1fr);
  gap: 1rem;
  padding-bottom: 1.65rem;
}

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

.page-about .ab-flowlist__item::before {
  content: "";
  position: absolute;
  left: 4rem;
  top: 1.4rem;
  bottom: 0;
  width: 2px;
  margin-left: -1px;
  background: var(--ab-hairline-dark);
}

.page-about .ab-flowlist__item:last-child::before {
  display: none;
}

.page-about .ab-flowlist__item::after {
  content: "";
  position: absolute;
  left: 4rem;
  top: 0.4rem;
  width: 11px;
  height: 11px;
  margin-left: -5.5px;
  border-radius: 50%;
  background: var(--orange-500);
  box-shadow: 0 0 0 4px rgba(255, 122, 41, 0.18);
  transition: transform 0.2s var(--ease-out);
}

.page-about .ab-flowlist__item:hover::after,
.page-about .ab-flowlist__item:focus-within::after {
  transform: scale(1.25);
}

.page-about .ab-flowlist__time {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.4;
  padding-top: 0.2rem;
  text-align: right;
  color: var(--orange-500);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-flowlist__body h3 {
  margin: 0 0 0.35rem;
  font-size: var(--fs-h3);
  font-weight: 700;
  color: #fff;
}

.page-about .ab-flowlist__body p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ---------- 结构图 ---------- */
.page-about .ab-figure--tall {
  max-width: 520px;
  margin-inline: auto;
}

.page-about .ab-figure--wide {
  margin-top: 1.75rem;
}

/* ---------- 岗位卡片 ---------- */
.page-about .ab-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .ab-role {
  position: relative;
  padding: clamp(1.15rem, 2.6vw, 1.7rem);
  background: var(--surface);
  transition: background 0.22s var(--ease-out);
}

.page-about .ab-role:hover,
.page-about .ab-role:focus-within {
  background: var(--sand-200);
}

.page-about .ab-role:focus-visible {
  outline: 2px solid var(--tech-blue-500);
  outline-offset: -3px;
}

.page-about .ab-role__no {
  display: inline-block;
  margin-bottom: 0.7rem;
  padding: 0.1rem 0.42rem;
  border-radius: var(--radius-s);
  background: var(--indigo-700);
  color: #fff;
  font-size: 0.72rem;
  line-height: 1.6;
}

.page-about .ab-role__title {
  margin: 0 0 0.55rem;
  font-size: var(--fs-h3);
  font-weight: 700;
  color: var(--ink-900);
}

.page-about .ab-role__text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--text-muted);
}

.page-about .ab-role__more {
  max-height: 0;
  margin: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--tech-blue-500);
  transition: max-height 0.28s var(--ease-out), opacity 0.22s var(--ease-out), margin-top 0.28s var(--ease-out);
}

.page-about .ab-role:hover .ab-role__more,
.page-about .ab-role:focus-within .ab-role__more {
  max-height: 8rem;
  margin-top: 0.8rem;
  opacity: 1;
}

/* ---------- 季度巡检 ---------- */
.page-about .ab-block--teal {
  background: var(--teal-800);
  color: #fff;
  border-top: 0;
  border-radius: var(--radius-m);
  padding: clamp(1.75rem, 4vw, 3rem);
  margin-block: clamp(1.5rem, 4vw, 2.75rem);
}

.page-about .ab-block--teal .ab-head__title {
  color: #fff;
}

.page-about .ab-block--teal .ab-head__no {
  background: rgba(191, 227, 220, 0.16);
  color: var(--mint-200);
}

.page-about .ab-block--teal .ab-intro,
.page-about .ab-block--teal .ab-outro {
  color: var(--ab-ink-soft);
}

.page-about .ab-block--teal .ab-outro {
  border-left-color: var(--mint-200);
}

.page-about .ab-quarters {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.75rem;
}

.page-about .ab-quarter {
  padding: 1.15rem 1.15rem 1.25rem;
  border-radius: var(--radius-m);
  transition: transform 0.22s var(--ease-out);
}

.page-about .ab-quarter:hover {
  transform: translateY(-4px);
}

.page-about .ab-quarter--1 {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}

.page-about .ab-quarter--2 {
  background: var(--mint-200);
  color: var(--ink-900);
}

.page-about .ab-quarter--3 {
  background: var(--sand-200);
  color: var(--ink-900);
}

.page-about .ab-quarter--4 {
  background: var(--paper-050);
  color: var(--ink-900);
}

.page-about .ab-quarter__no {
  display: block;
  margin-bottom: 0.55rem;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--orange-500);
}

.page-about .ab-quarter--1 .ab-quarter__no {
  color: var(--orange-500);
}

.page-about .ab-quarter h3 {
  margin: 0 0 0.45rem;
  font-size: var(--fs-h3);
  font-weight: 700;
  line-height: 1.25;
}

.page-about .ab-quarter p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.65;
  color: inherit;
  opacity: 0.85;
}

/* ---------- 阶段时间线 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.35rem;
}

.page-about .ab-timeline__item {
  position: relative;
  padding-top: 1.4rem;
  border-top: 2px solid var(--line);
}

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  top: -7px;
  left: 0;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--tech-blue-500);
  transition: background 0.2s var(--ease-out), transform 0.2s var(--ease-out);
}

.page-about .ab-timeline__item:hover::before {
  background: var(--orange-500);
  transform: scale(1.3);
}

.page-about .ab-timeline__stage {
  display: inline-block;
  margin-bottom: 0.45rem;
  padding: 0.12rem 0.5rem;
  border-radius: var(--radius-pill);
  background: var(--indigo-700);
  color: #fff;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}

.page-about .ab-timeline__title {
  margin: 0 0 0.45rem;
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink-900);
}

.page-about .ab-timeline__item p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.68;
  color: var(--text-muted);
}

/* ---------- 结尾引导 ---------- */
.page-about .ab-cta {
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .ab-cta__inner {
  position: relative;
  overflow: hidden;
  padding: clamp(1.75rem, 4.5vw, 3.25rem);
  border-radius: var(--radius-m);
  background: linear-gradient(135deg, var(--indigo-700) 0%, var(--ink-900) 100%);
  color: #fff;
}

.page-about .ab-cta__inner::after {
  content: "";
  position: absolute;
  right: -8%;
  top: -40%;
  width: 42%;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: var(--orange-500);
  opacity: 0.16;
  pointer-events: none;
}

.page-about .ab-cta__eyebrow {
  margin: 0 0 0.85rem;
  color: var(--mint-200);
}

.page-about .ab-cta__title {
  position: relative;
  margin: 0 0 0.9rem;
  max-width: 24ch;
  font-size: var(--fs-h2);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: #fff;
}

.page-about .ab-cta__text {
  position: relative;
  max-width: 58ch;
  margin: 0 0 1.6rem;
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--ab-ink-soft);
}

.page-about .ab-cta__actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .ab-cta__links {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
  margin: 1.35rem 0 0;
  font-size: var(--fs-meta);
  color: rgba(255, 255, 255, 0.5);
}

.page-about .ab-cta__links a {
  color: var(--mint-200);
  text-decoration: none;
  border-bottom: 1px solid rgba(191, 227, 220, 0.45);
  padding-bottom: 1px;
  transition: color 0.16s var(--ease-out), border-color 0.16s var(--ease-out);
}

.page-about .ab-cta__links a:hover,
.page-about .ab-cta__links a:focus-visible {
  color: var(--orange-500);
  border-bottom-color: var(--orange-500);
}

/* ---------- 图片容器补充 ---------- */
.page-about .lb-media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius-m);
}

.page-about .lb-media__caption {
  margin-top: 0.6rem;
  font-size: var(--fs-meta);
  line-height: 1.6;
  color: var(--gray-600);
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about .ab-quarters {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .ab-canvas {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-about .ab-rail {
    display: block;
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .ab-timeline {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 1.5rem;
  }

  .page-about .ab-roles {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-quarters {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-block--dark,
  .page-about .ab-block--teal {
    margin-inline: calc(var(--gutter) * -0.5);
  }
}

@media (min-width: 1100px) {
  .page-about .ab-hero__title {
    max-width: 13ch;
  }
}

/* ---------- 无悬停设备 ---------- */
@media (hover: none) {
  .page-about .ab-role__more {
    max-height: none;
    margin-top: 0.8rem;
    opacity: 1;
  }
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .ab-quarter:hover {
    transform: none;
  }

  .page-about .ab-flowlist__item:hover::after,
  .page-about .ab-flowlist__item:focus-within::after {
    transform: none;
  }

  .page-about .ab-timeline__item:hover::before {
    transform: none;
  }

  .page-about .ab-role__more {
    transition: none;
  }
}