/* ============================================================
   品牌档案 / page-about
   仅在本页作用域内生效
   ============================================================ */

.page-about {
  --about-card-shadow: var(--shadow-hard-sm);
  --about-card-shadow-hover: var(--shadow-hard);
}

/* ---------- 面包屑与章节通用 ---------- */

.page-about .yg-breadcrumb {
  margin-bottom: clamp(20px, 3vw, 36px);
}

.page-about .yg-section {
  padding-block: clamp(44px, 6.5vw, 84px);
}

.page-about .yg-section__head {
  max-width: 64ch;
  margin-bottom: clamp(26px, 4vw, 42px);
}

.page-about .yg-section__head::before {
  content: "";
  display: block;
  width: 76px;
  height: 4px;
  border-radius: 2px;
  margin-bottom: 18px;
  background: linear-gradient(90deg, var(--y2021), var(--y2022) 34%, var(--y2023) 67%, var(--y2024));
}

.page-about .yg-eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--amber);
  margin: 0 0 10px;
}

.page-about .yg-section__title {
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(1.55rem, 3.6vw, 2.5rem);
  line-height: 1.2;
  letter-spacing: -.018em;
  color: var(--paper);
  margin: 0 0 12px;
}

.page-about .yg-section__lead {
  font-size: clamp(.98rem, 1.5vw, 1.1rem);
  line-height: 1.78;
  color: var(--muted);
  margin: 0;
}

.page-about h3 {
  font-family: var(--display);
  font-weight: 800;
  font-size: 1.05rem;
  line-height: 1.4;
  letter-spacing: -.01em;
  color: var(--paper);
  margin: 0 0 8px;
}

.page-about a {
  color: var(--cyan);
}

/* ============================================================
   首屏
   ============================================================ */

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

.page-about .about-hero__title {
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(2.05rem, 6.6vw, 4.1rem);
  line-height: 1.05;
  letter-spacing: -.028em;
  color: var(--paper);
  margin: 0 0 22px;
  max-width: 16ch;
}

.page-about .about-hero__lead {
  font-size: clamp(1rem, 1.6vw, 1.14rem);
  line-height: 1.82;
  color: var(--muted);
  max-width: 52ch;
  margin: 0 0 16px;
}

.page-about .about-hero__lead:last-child {
  margin-bottom: 0;
}

.page-about .about-hero__visual {
  position: relative;
  margin: 0;
  border: 2px solid var(--iron);
  border-radius: var(--r-md);
  background: var(--archive);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .about-hero__visual img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  filter: saturate(.85) contrast(1.05);
}

.page-about .about-hero__visual::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    to bottom,
    rgba(53, 240, 220, .07) 0 1px,
    transparent 1px 4px
  );
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(30px, 5vw, 54px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 16px;
}

.page-about .about-fact {
  border-left: 2px solid var(--iron);
  padding: 4px 0 4px 14px;
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(1.45rem, 3.4vw, 2.1rem);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .about-fact__unit {
  font-size: .55em;
  color: var(--muted);
  margin-left: 3px;
}

.page-about .about-fact__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: .06em;
  color: var(--muted);
}

/* ============================================================
   团队
   ============================================================ */

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .about-team__card {
  position: relative;
  border: 2px solid var(--iron);
  border-radius: var(--r-md);
  background: var(--archive);
  padding: 22px 20px 20px;
  box-shadow: var(--about-card-shadow);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.page-about .about-team__card:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--about-card-shadow-hover);
  border-color: var(--cyan);
}

.page-about .about-team__count {
  display: block;
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(2.1rem, 4.4vw, 2.8rem);
  line-height: 1;
  color: var(--cyan);
  margin-bottom: 12px;
}

.page-about .about-team__card p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-team__note {
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--signal);
  font-size: .95rem;
  line-height: 1.78;
  color: var(--muted);
  max-width: 62ch;
}

/* ============================================================
   时间线
   ============================================================ */

.page-about .about-timeline__figure {
  margin: 0 0 clamp(24px, 3.5vw, 36px);
  border: 2px solid var(--iron);
  border-radius: var(--r-md);
  background: var(--archive);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-about .about-timeline__track {
  list-style: none;
  margin: 0;
  padding: 0 0 14px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(248px, 80%);
  gap: 16px;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
}

.page-about .about-timeline__node {
  scroll-snap-align: start;
  position: relative;
  border: 2px solid var(--iron);
  border-top: 6px solid var(--node, var(--cyan));
  border-radius: var(--r-md);
  background: var(--archive);
  padding: 20px 18px 22px;
  box-shadow: var(--about-card-shadow);
  transition: transform .18s ease, box-shadow .18s ease;
}

.page-about .about-timeline__node:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--about-card-shadow-hover);
}

.page-about .about-timeline__node:nth-child(1) { --node: var(--y2021); }
.page-about .about-timeline__node:nth-child(2) { --node: var(--y2022); }
.page-about .about-timeline__node:nth-child(3) { --node: var(--y2023); }
.page-about .about-timeline__node:nth-child(4) { --node: var(--y2024); }

.page-about .about-timeline__num {
  display: block;
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(2rem, 4.6vw, 3rem);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--paper);
  margin: 14px 0 10px;
}

.page-about .about-timeline__unit {
  display: block;
  font-size: 11px;
  font-weight: 400;
  letter-spacing: .08em;
  color: var(--muted);
  margin-top: 8px;
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-timeline__foot {
  margin: clamp(20px, 3vw, 28px) 0 0;
  font-size: .95rem;
  line-height: 1.78;
  color: var(--muted);
  max-width: 64ch;
}

/* ============================================================
   核校流程
   ============================================================ */

.page-about .about-check__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.5vw, 40px);
  align-items: start;
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  border: 2px solid var(--iron);
  border-radius: var(--r-sm);
  background: var(--archive);
  padding: 16px 18px;
  box-shadow: var(--about-card-shadow);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.page-about .about-step:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--about-card-shadow-hover);
  border-color: var(--cyan);
}

.page-about .about-step__idx {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 1.25rem;
  line-height: 1.5;
  color: var(--cyan);
  border-right: 2px solid var(--iron);
  padding-right: 12px;
}

.page-about .about-step__body h3 {
  font-size: 1rem;
  margin-bottom: 6px;
}

.page-about .about-step__body p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-check__figure {
  margin: 0;
  border: 2px solid var(--iron);
  border-radius: var(--r-md);
  background: var(--archive);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .about-check__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-about .about-check__figure figcaption {
  padding: 14px 16px 16px;
  border-top: 2px solid var(--iron);
  font-size: .86rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-check__note {
  margin: clamp(24px, 3.5vw, 34px) 0 0;
  padding: 16px 18px;
  border: 2px solid var(--iron);
  border-left: 6px solid var(--signal);
  border-radius: var(--r-sm);
  background: var(--ink);
  font-size: .93rem;
  line-height: 1.78;
  color: var(--paper);
  max-width: 70ch;
}

/* ============================================================
   资料下载
   ============================================================ */

.page-about .about-download__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 3.5vw, 42px);
  align-items: start;
}

.page-about .about-download__intro p {
  margin: 0 0 16px;
  font-size: .97rem;
  line-height: 1.82;
  color: var(--muted);
  max-width: 52ch;
}

.page-about .about-download__intro .yg-btn {
  margin-top: 10px;
}

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

.page-about .about-download__item {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 18px 0;
  border-bottom: 1px solid var(--iron);
}

.page-about .about-download__key {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 1.6rem;
  line-height: 1.25;
  color: var(--amber);
  letter-spacing: -.02em;
}

.page-about .about-download__item h3 {
  font-size: 1rem;
  margin-bottom: 5px;
}

.page-about .about-download__item p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.72;
  color: var(--muted);
}

/* ============================================================
   伙伴
   ============================================================ */

.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 3.5vw, 42px);
  align-items: start;
}

.page-about .about-partners__copy p {
  margin: 0 0 16px;
  font-size: .97rem;
  line-height: 1.82;
  color: var(--muted);
  max-width: 54ch;
}

.page-about .about-partners__honor {
  padding: 14px 16px;
  border: 2px solid var(--iron);
  border-left: 6px solid var(--amber);
  border-radius: var(--r-sm);
  background: var(--archive);
  color: var(--paper) !important;
  font-weight: 600;
}

.page-about .about-tagwall {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-content: start;
}

.page-about .about-tagwall li {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--paper);
  background: var(--ink);
  border: 2px solid var(--iron);
  border-radius: var(--r-sm);
  padding: 9px 13px;
  box-shadow: 3px 3px 0 rgba(0, 0, 0, .55);
  transition: border-color .18s ease, color .18s ease, transform .18s ease;
}

.page-about .about-tagwall li:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  transform: translate(-1px, -1px);
}

/* ============================================================
   覆盖与承诺
   ============================================================ */

.page-about .about-reach__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(148px, 1fr));
  gap: 16px;
}

.page-about .about-reach__stat {
  border: 2px solid var(--iron);
  border-radius: var(--r-sm);
  background: var(--archive);
  padding: 18px 16px;
  box-shadow: var(--about-card-shadow);
}

.page-about .about-reach__num {
  display: block;
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  line-height: 1.05;
  letter-spacing: -.03em;
  color: var(--amber);
}

.page-about .about-reach__unit {
  font-size: .48em;
  font-weight: 400;
  color: var(--muted);
  margin-left: 3px;
}

.page-about .about-reach__label {
  display: block;
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-reach__note {
  margin: clamp(24px, 3.5vw, 34px) 0 0;
  padding: 16px 18px;
  border: 2px solid var(--iron);
  border-left: 6px solid var(--cyan);
  border-radius: var(--r-sm);
  background: var(--ink);
  font-size: .93rem;
  line-height: 1.8;
  color: var(--paper);
  max-width: 72ch;
}

.page-about .about-reach__contact {
  margin-top: clamp(22px, 3vw, 30px);
  border-top: 2px solid var(--iron);
}

.page-about .yg-contact-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  padding: 15px 0;
  border-bottom: 1px solid var(--iron);
}

.page-about .yg-contact-row__label {
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--muted);
}

.page-about .yg-contact-row__value {
  flex: 1 1 200px;
  font-family: var(--mono);
  font-size: .95rem;
  color: var(--paper);
  word-break: break-all;
}

.page-about .yg-copy {
  flex: 0 0 auto;
}

.page-about .about-reach__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .about-reach__actions .yg-btn {
  flex: 1 1 auto;
  justify-content: center;
}

/* ============================================================
   断点
   ============================================================ */

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

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

  .page-about .about-reach__actions .yg-btn {
    flex: 0 0 auto;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }

  .page-about .about-hero__visual {
    margin-top: 8px;
  }

  .page-about .about-timeline__track {
    grid-auto-flow: row;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    grid-auto-columns: auto;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-download__grid,
  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
}

@media (min-width: 980px) {
  .page-about .about-check__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  }

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

@media (min-width: 1180px) {
  .page-about .about-hero__title {
    max-width: 14ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__card,
  .page-about .about-step,
  .page-about .about-timeline__node,
  .page-about .about-tagwall li {
    transition: none;
  }
}