/* =========================================================
   关于我们（/company/）—— 叙事介绍页
   全部选择器限定在 .page-about 作用域内
   ========================================================= */

.page-about {
  display: block;
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

/* ---- 面包屑定位 ---- */
.page-about .about-crumb {
  margin-bottom: var(--space-4);
}

/* =========================================================
   首屏
   ========================================================= */
.page-about .about-hero {
  padding: var(--space-6) 0 var(--space-8);
  background:
    radial-gradient(110% 85% at 92% -12%,
      color-mix(in srgb, var(--color-primary-soft) 92%, transparent) 0%,
      transparent 62%),
    var(--color-surface);
}

.page-about .about-hero__grid {
  display: grid;
  gap: var(--space-6);
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: var(--space-8);
    align-items: center;
  }
}

.page-about .about-hero__title {
  font-family: var(--font-heading);
  font-size: clamp(var(--text-xl), 4.6vw, var(--text-3xl));
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  margin: var(--space-2) 0 var(--space-3);
  text-wrap: balance;
}

.page-about .about-hero__lead {
  max-width: 48ch;
  color: var(--color-ink-soft);
}

.page-about .about-hero__figure {
  margin: 0;
}

/* ---- 首屏关键数字条 ---- */
.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: var(--space-8) 0 0;
  padding: 0;
  background: var(--color-line);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

@media (min-width: 720px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-fact {
  background: var(--color-surface);
  padding: var(--space-3) var(--space-4);
}

.page-about .about-fact__key {
  margin: 0 0 var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  letter-spacing: 0.01em;
}

.page-about .about-fact__val {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  color: var(--color-primary);
  letter-spacing: -0.01em;
}

/* =========================================================
   通用区块节奏与底色交替
   ========================================================= */
.page-about .about-band {
  padding: var(--section-y) 0;
}

@media (min-width: 1080px) {
  .page-about .about-band {
    padding: var(--section-y-lg) 0;
  }
}

.page-about .about-band--plain {
  background: var(--color-surface);
}

.page-about .about-band--soft {
  background: color-mix(in srgb, var(--color-surface-alt) 82%, var(--color-surface));
}

.page-about .about-band--deep {
  background: var(--color-surface-alt);
}

.page-about .about-band--dark {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-about .about-band--last {
  padding-bottom: calc(var(--section-y) + var(--space-4));
}

/* ---- 章节头 ---- */
.page-about .about-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

@media (min-width: 720px) {
  .page-about .about-head {
    grid-template-columns: auto minmax(0, 1fr);
    gap: var(--space-2) var(--space-6);
    align-items: start;
  }
}

.page-about .section-index {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: 0.92;
  letter-spacing: -0.03em;
  color: var(--color-primary);
  transition: color 240ms ease;
}

.page-about .section-index[data-inview="true"] {
  color: var(--color-accent);
}

.page-about .about-head__body {
  max-width: var(--measure);
}

/* ---- 深色区块内的文字与编号反相 ---- */
.page-about .about-band--dark .chapter-title,
.page-about .about-band--dark .block-title {
  color: var(--color-contrast-ink);
}

.page-about .about-band--dark .chapter-desc,
.page-about .about-band--dark .block-note,
.page-about .about-band--dark p {
  color: color-mix(in srgb, var(--color-contrast-ink) 76%, transparent);
}

.page-about .about-band--dark .section-index {
  color: color-mix(in srgb, var(--color-contrast-accent) 62%, var(--color-contrast-ink));
}

.page-about .about-band--dark .section-index[data-inview="true"] {
  color: var(--color-contrast-accent);
}

/* =========================================================
   01 我们是谁
   ========================================================= */
.page-about .about-lede {
  max-width: var(--measure);
  display: grid;
  gap: var(--space-3);
}

.page-about .about-lede p {
  margin: 0;
  color: var(--color-ink-soft);
}

.page-about .about-lede p:first-child {
  font-size: var(--text-lg);
  line-height: 1.6;
  color: var(--color-ink);
}

/* =========================================================
   02 为什么先把入口做稳
   ========================================================= */
.page-about .about-why {
  display: grid;
  gap: var(--space-6);
}

@media (min-width: 900px) {
  .page-about .about-why {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--space-8);
    align-items: start;
  }
}

.page-about .about-why__text {
  display: grid;
  gap: var(--space-3);
  max-width: var(--measure);
}

.page-about .about-why__text p {
  margin: 0;
}

.page-about .about-why__aside {
  padding: var(--space-4);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--color-contrast-accent) 8%, transparent);
  transition: border-color 220ms ease, transform 220ms ease;
}

.page-about .about-why__aside:hover {
  border-color: var(--color-contrast-accent);
  transform: translateY(-2px);
}

.page-about .about-why__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 0.95;
  letter-spacing: -0.04em;
  color: var(--color-contrast-accent);
}

.page-about .about-why__label {
  margin: var(--space-1) 0 var(--space-2);
  font-size: var(--text-sm);
  letter-spacing: 0.05em;
  color: var(--color-contrast-ink);
}

.page-about .about-why__note {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.7;
}

/* =========================================================
   03 团队与机制
   ========================================================= */
.page-about .about-team {
  display: grid;
  gap: var(--space-6);
}

@media (min-width: 1000px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--space-6);
    align-items: stretch;
  }
}

.page-about .about-unit-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
}

@media (min-width: 900px) {
  .page-about .about-unit-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    grid-template-rows: auto auto;
    align-content: start;
  }
  .page-about .about-unit-grid > .about-unit:first-child {
    grid-row: 1 / span 2;
  }
}

.page-about .about-unit {
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  transition: transform 200ms ease, box-shadow 200ms ease, border-color 200ms ease;
}

.page-about .about-unit:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
  border-color: var(--color-primary);
}

.page-about .about-unit--focus {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-ink);
}

.page-about .about-unit--focus:hover {
  border-color: var(--color-accent-ink);
}

.page-about .about-unit__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--color-primary);
}

.page-about .about-unit--focus .about-unit__num {
  color: var(--color-accent-ink);
}

.page-about .about-unit__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  line-height: 1.4;
  color: var(--color-ink);
}

.page-about .about-unit--focus .about-unit__title {
  color: var(--color-accent-ink);
}

.page-about .about-unit__text {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.72;
  color: var(--color-ink-soft);
}

.page-about .about-unit--focus .about-unit__text {
  color: color-mix(in srgb, var(--color-accent-ink) 88%, transparent);
}

.page-about .about-team__figure {
  margin: 0;
  align-self: stretch;
}

.page-about .about-team__figure .image-frame__img {
  height: 100%;
}

/* =========================================================
   04 一路走来
   ========================================================= */
.page-about .about-history {
  display: grid;
  gap: var(--space-6);
}

@media (min-width: 1000px) {
  .page-about .about-history {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: var(--space-8);
    align-items: start;
  }
}

.page-about .about-track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
}

.page-about .about-track__node {
  position: relative;
  padding-left: var(--space-8);
  padding-bottom: var(--space-1);
}

.page-about .about-track__node::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 12px;
  bottom: calc(-1 * var(--space-4));
  width: 2px;
  background: var(--color-line);
}

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

.page-about .about-track__node::after {
  content: "";
  position: absolute;
  left: 12px;
  top: 6px;
  width: 16px;
  height: 16px;
  box-sizing: border-box;
  border-radius: var(--radius-pill);
  background: var(--color-surface-deep);
  border: 2px solid var(--color-primary);
  transition: background 200ms ease, border-color 200ms ease;
}

.page-about .about-track__node:hover::after {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.page-about .about-track__ver {
  display: inline-block;
  margin-bottom: var(--space-1);
  padding: 2px var(--space-2);
  border-radius: var(--radius-pill);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.04em;
  transition: background 200ms ease, color 200ms ease;
}

.page-about .about-track__node:hover .about-track__ver {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.page-about .about-track__title {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.35;
  color: var(--color-ink);
}

.page-about .about-track__text {
  margin: 0;
  max-width: 44ch;
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-soft);
}

.page-about .about-history__figure {
  margin: 0;
}

/* =========================================================
   05 服务边界
   ========================================================= */
.page-about .about-bounds {
  position: relative;
  max-width: 900px;
}

.page-about .about-bounds__input {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.page-about .about-bounds__tabs {
  display: inline-flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  padding: 4px;
  margin-bottom: var(--space-4);
  border-radius: var(--radius-pill);
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
}

.page-about .about-bounds__tab {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  color: var(--color-ink-soft);
  cursor: pointer;
  transition: background 200ms ease, color 200ms ease;
}

.page-about .about-bounds__tab:hover {
  color: var(--color-primary);
}

.page-about .about-bounds__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-1);
}

.page-about .about-bounds__list--out {
  display: none;
}

.page-about .about-bounds__list li {
  position: relative;
  padding: var(--space-3) var(--space-4) var(--space-3) var(--space-6);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-ink);
}

.page-about .about-bounds__list li::before {
  content: "";
  position: absolute;
  left: var(--space-3);
  top: 50%;
  width: 8px;
  height: 8px;
  margin-top: -4px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
}

.page-about .about-bounds__list--out li::before {
  background: var(--color-ink-muted);
}

/* 选中态 —— 依赖 :has()，不支持时仍完整显示第一组 */
.page-about .about-bounds:has(#about-bounds-in:checked) label[for="about-bounds-in"],
.page-about .about-bounds:has(#about-bounds-out:checked) label[for="about-bounds-out"] {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-about .about-bounds:has(#about-bounds-out:checked) .about-bounds__list--in {
  display: none;
}

.page-about .about-bounds:has(#about-bounds-out:checked) .about-bounds__list--out {
  display: grid;
}

.page-about .about-bounds:has(.about-bounds__input:focus-visible) .about-bounds__tabs {
  outline: 2px solid var(--color-focus);
  outline-offset: 4px;
}

.page-about .about-bounds__foot {
  max-width: var(--measure);
  margin: var(--space-4) 0 0;
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-soft);
}

.page-about .about-bounds__foot a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-bounds__foot a:hover {
  color: var(--color-accent);
}

/* =========================================================
   06 合作生态
   ========================================================= */
.page-about .about-eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
}

@media (min-width: 860px) {
  .page-about .about-eco {
    grid-template-columns: minmax(0, 5fr) minmax(0, 4fr) minmax(0, 3fr);
    align-items: start;
  }
}

.page-about .about-eco__item {
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  transition: transform 200ms ease, box-shadow 200ms ease, border-color 200ms ease;
}

.page-about .about-eco__item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-1);
  border-color: var(--color-primary);
}

@media (min-width: 860px) {
  .page-about .about-eco__item:nth-child(2) {
    margin-top: var(--space-4);
  }
  .page-about .about-eco__item:nth-child(3) {
    margin-top: var(--space-8);
  }
}

.page-about .about-eco__item .block-note {
  margin: 0;
}

/* =========================================================
   07 现在走到哪一步 + 行动出口
   ========================================================= */
.page-about .about-close {
  display: grid;
  gap: var(--space-6);
}

@media (min-width: 1000px) {
  .page-about .about-close {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: var(--space-8);
    align-items: start;
  }
}

.page-about .about-close__text {
  display: grid;
  gap: var(--space-3);
  max-width: 42ch;
}

.page-about .about-close__text p {
  margin: 0;
}

.page-about .about-close__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
}

.page-about .about-close__stats .stat {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  border: var(--border-thin) solid var(--color-contrast-line);
  background: color-mix(in srgb, var(--color-contrast-ink) 6%, transparent);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.page-about .about-close__stats .stat-value {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--color-contrast-accent);
}

.page-about .about-close__stats .stat-label {
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
}

.page-about .about-exit {
  margin-top: var(--space-8);
  padding: var(--space-4) var(--space-4) var(--space-4);
  border-radius: var(--radius-lg);
  border: var(--border-thin) solid var(--color-contrast-line);
  display: grid;
  gap: var(--space-3);
}

@media (min-width: 860px) {
  .page-about .about-exit {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: var(--space-6);
  }
}

.page-about .about-exit__text {
  margin: 0;
  max-width: 56ch;
}

.page-about .about-exit__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* =========================================================
   图片容器微调
   ========================================================= */
.page-about .image-frame {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-1);
}

.page-about .image-frame__img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
  display: block;
}

.page-about .image-frame__caption {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

/* =========================================================
   窄屏与超宽微调
   ========================================================= */
@media (max-width: 599px) {
  .page-about .about-hero {
    padding-top: var(--space-4);
  }

  .page-about .about-exit__actions .btn {
    flex: 1 1 auto;
    text-align: center;
  }

  .page-about .about-bounds__list li {
    padding-right: var(--space-3);
  }
}

@media (min-width: 1400px) {
  .page-about .about-lede p:first-child {
    font-size: var(--text-xl);
  }
}