/* ==========================================================
   PAGE: ABOUT · 关于我们
   时间轴布局 · 深蓝主调 · 金色节点 · 精密网格
   ========================================================== */

.page-about {
  --about-gold-line: rgba(201, 162, 39, 0.32);
  --about-soft-line: rgba(255, 255, 255, 0.1);
  --about-card-deep: #0E254A;
  --about-body-light: rgba(255, 255, 255, 0.78);
  background: var(--color-paper);
  overflow-x: hidden;
}

/* ---------- 面包屑增强 ---------- */
.page-about .breadcrumb {
  background: var(--color-navy);
  border-bottom: 1px solid var(--about-soft-line);
  color: var(--color-gray);
  font-size: var(--fs-small);
  padding: 16px 0;
}

.page-about .breadcrumb a {
  color: var(--color-gold-light);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .breadcrumb a:hover {
  color: var(--color-gold);
  text-decoration: underline;
}

.page-about .breadcrumb__sep {
  margin: 0 8px;
  color: var(--color-gray);
}

/* ---------- Hero 首屏 ---------- */
.page-about .about-hero {
  background: var(--color-navy);
  color: #fff;
  overflow: hidden;
  position: relative;
  padding: 72px 0 88px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -160px;
  top: -100px;
  width: 460px;
  height: 460px;
  background: var(--color-gold);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
  opacity: 0.12;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-gold) 0 30%, transparent 30%);
}

.page-about .about-hero__inner {
  display: grid;
  gap: 48px;
  position: relative;
  z-index: 1;
}

.page-about .about-hero__content {
  max-width: 720px;
}

.page-about .about-hero .kicker {
  color: var(--color-gold);
  letter-spacing: 0.08em;
}

.page-about .about-hero h1 {
  font-family: var(--font-headline);
  font-size: clamp(2rem, 5vw, 2.8rem);
  font-weight: 700;
  line-height: 1.15;
  margin: 12px 0 20px;
  letter-spacing: -0.01em;
}

.page-about .about-hero__lead {
  color: var(--color-gold-light);
  font-size: var(--fs-h3);
  font-weight: 500;
  margin: 0 0 18px;
}

.page-about .about-hero__desc {
  color: var(--color-gray);
  font-size: var(--fs-body);
  line-height: 1.8;
  margin: 0 0 32px;
  max-width: 58ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-hero__aside {
  border-top: 1px solid var(--about-soft-line);
  padding-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.page-about .about-hero__note {
  writing-mode: vertical-rl;
  color: var(--color-gold);
  font-size: var(--fs-small);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  align-self: flex-start;
}

.page-about .about-hero__stamp {
  display: flex;
  align-items: flex-end;
  gap: 14px;
  padding: 20px;
  border: 1px solid var(--about-gold-line);
  background: rgba(201, 162, 39, 0.08);
  max-width: 240px;
}

.page-about .about-hero__stamp-year {
  font-family: var(--font-headline);
  font-size: 4.2rem;
  font-weight: 700;
  line-height: 0.9;
  color: var(--color-gold);
}

.page-about .about-hero__stamp-unit {
  font-size: var(--fs-small);
  line-height: 1.4;
  color: var(--about-body-light);
  padding-bottom: 4px;
}

.page-about .about-hero__facts {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
}

.page-about .about-hero__facts div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.14);
  padding-bottom: 10px;
  margin-bottom: 10px;
}

.page-about .about-hero__facts div:last-child {
  border-bottom: none;
  margin-bottom: 0;
}

.page-about .about-hero__facts dt {
  color: var(--color-gray);
  font-size: var(--fs-small);
  line-height: 1.4;
}

.page-about .about-hero__facts dd {
  color: var(--color-gold-light);
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 1.1rem;
  margin: 0;
}

/* ---------- 品牌故事 ---------- */
.page-about .about-story {
  background: var(--color-paper);
  padding: 88px 0;
}

.page-about .about-story__grid {
  display: grid;
  gap: 44px;
}

.page-about .about-story__header .kicker,
.page-about .about-timeline__header .kicker,
.page-about .about-team__header .kicker,
.page-about .about-security__content .kicker,
.page-about .about-ecosystem__header .kicker {
  color: var(--color-gold);
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.page-about .about-story__header h2 {
  font-family: var(--font-headline);
  font-size: var(--fs-h2);
  line-height: 1.3;
  color: var(--color-ink);
  margin: 12px 0 16px;
}

.page-about .about-story .rule {
  margin: 20px 0 24px;
}

.page-about .about-story__intro-text {
  color: var(--color-muted);
  font-size: var(--fs-body);
  line-height: 1.8;
  max-width: 42ch;
}

.page-about .about-story__body p {
  color: var(--color-ink);
  line-height: 1.85;
  margin: 0 0 18px;
}

.page-about .about-story__principles {
  margin-top: 32px;
  border-top: 1px solid rgba(138, 155, 168, 0.4);
}

.page-about .about-story__principle {
  display: flex;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid rgba(138, 155, 168, 0.3);
}

.page-about .about-story__principle-idx {
  font-family: var(--font-headline);
  font-weight: 700;
  color: var(--color-gold);
  font-size: var(--fs-h3);
  line-height: 1.2;
  min-width: 44px;
}

.page-about .about-story__principle h3 {
  font-family: var(--font-headline);
  font-size: var(--fs-body);
  font-weight: 700;
  margin: 0 0 4px;
  color: var(--color-ink);
}

.page-about .about-story__principle p {
  font-size: var(--fs-small);
  color: var(--color-muted);
  line-height: 1.7;
  margin: 0;
}

/* ---------- 发展历程：时间轴 ---------- */
.page-about .about-timeline {
  background: var(--color-navy);
  color: #fff;
  padding: 96px 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(
    180deg,
    transparent,
    rgba(201, 162, 39, 0.22) 12%,
    rgba(201, 162, 39, 0.22) 88%,
    transparent
  );
}

.page-about .about-timeline__header {
  margin-bottom: 56px;
}

.page-about .about-timeline__header h2 {
  font-family: var(--font-headline);
  font-size: var(--fs-h2);
  line-height: 1.3;
  margin: 12px 0 10px;
  color: #fff;
}

.page-about .about-timeline__header .section__lead {
  color: var(--about-body-light);
  font-size: var(--fs-small);
  line-height: 1.7;
  margin: 0;
}

.page-about .about-timeline__layout {
  display: grid;
  gap: 48px;
  align-items: start;
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-gold), rgba(201, 162, 39, 0.15));
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 56px;
  padding-bottom: 40px;
}

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

.page-about .about-timeline__axis {
  position: absolute;
  left: 0;
  top: 2px;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about .about-timeline__dot {
  display: block;
  width: 12px;
  height: 12px;
  background: var(--color-gold);
  transform: rotate(45deg);
  box-shadow: 0 0 0 2px rgba(201, 162, 39, 0.25);
  transition: background 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.page-about .about-timeline__item:hover .about-timeline__dot {
  background: var(--color-gold-light);
  box-shadow: 0 0 0 4px rgba(227, 199, 104, 0.28);
  transform: rotate(45deg) scale(1.15);
}

.page-about .about-timeline__card {
  background: var(--about-card-deep);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 0;
  padding: 22px 24px;
  transition: border-color 0.22s ease, box-shadow 0.22s ease;
  position: relative;
}

.page-about .about-timeline__item:hover .about-timeline__card {
  border-color: rgba(201, 162, 39, 0.5);
  box-shadow: 0 0 0 1px rgba(201, 162, 39, 0.22), 0 12px 28px rgba(0, 0, 0, 0.26);
}

.page-about .about-timeline__year {
  display: inline-block;
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: var(--fs-h3);
  color: var(--color-gold);
  margin-bottom: 10px;
  letter-spacing: 0.04em;
}

.page-about .about-timeline__card h3 {
  font-family: var(--font-headline);
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  margin: 0 0 8px;
}

.page-about .about-timeline__card p {
  color: var(--about-body-light);
  font-size: var(--fs-small);
  line-height: 1.75;
  margin: 0;
}

.page-about .about-timeline__map {
  position: relative;
  margin: 0;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: var(--about-card-deep);
}

.page-about .about-timeline__map img {
  display: block;
  width: 100%;
  height: auto;
  opacity: 0.92;
}

.page-about .about-timeline__map-overlay {
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 14px;
  background: rgba(10, 31, 68, 0.86);
  border: 1px solid rgba(201, 162, 39, 0.25);
  padding: 16px 18px;
}

.page-about .about-timeline__map-tag {
  display: inline-block;
  font-family: var(--font-headline);
  font-size: var(--fs-small);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-gold-light);
  border-bottom: 2px solid var(--color-gold);
  padding-bottom: 4px;
  margin-bottom: 8px;
}

.page-about .about-timeline__map-overlay p {
  color: var(--about-body-light);
  font-size: var(--fs-small);
  line-height: 1.65;
  margin: 0;
}

/* ---------- 团队实力 ---------- */
.page-about .about-team {
  background: var(--color-paper);
  padding: 96px 0;
}

.page-about .about-team__header h2 {
  font-family: var(--font-headline);
  font-size: var(--fs-h2);
  line-height: 1.3;
  color: var(--color-ink);
  margin: 12px 0 10px;
}

.page-about .about-team__header .section__lead {
  color: var(--color-muted);
  font-size: var(--fs-small);
  line-height: 1.7;
  margin: 0;
}

.page-about .about-team__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin: 48px 0;
}

.page-about .about-team__stat {
  background: var(--color-card);
  border: 1px solid rgba(138, 155, 168, 0.4);
  border-top: 3px solid var(--color-gold);
  padding: 24px 16px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease, border-top-color 0.2s ease;
}

.page-about .about-team__stat:hover {
  box-shadow: var(--shadow-lg);
  border-top-color: var(--color-gold-light);
}

.page-about .about-team__stat .stat-num {
  display: block;
  font-family: var(--font-headline);
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 700;
  color: var(--color-navy);
  line-height: 1.2;
}

.page-about .about-team__stat-label {
  display: block;
  margin-top: 8px;
  font-size: var(--fs-small);
  color: var(--color-muted);
}

.page-about .about-team__layout {
  display: grid;
  gap: 40px;
  align-items: start;
}

.page-about .about-team__media {
  margin: 0;
  border: 1px solid rgba(138, 155, 168, 0.4);
  background: var(--color-navy);
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-team__roles {
  border-top: 3px solid var(--color-navy);
}

.page-about .about-team__role {
  display: flex;
  gap: 18px;
  padding: 22px 0;
  border-bottom: 1px solid rgba(138, 155, 168, 0.35);
  transition: background 0.2s ease;
}

.page-about .about-team__role:hover {
  background: rgba(201, 162, 39, 0.05);
}

.page-about .about-team__role-idx {
  font-family: var(--font-headline);
  font-weight: 700;
  color: var(--color-gold);
  font-size: var(--fs-small);
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border: 1px solid rgba(138, 155, 168, 0.5);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .about-team__role:hover .about-team__role-idx {
  border-color: var(--color-gold);
  color: var(--color-gold);
}

.page-about .about-team__role h3 {
  font-family: var(--font-headline);
  font-size: var(--fs-body);
  font-weight: 700;
  color: var(--color-ink);
  margin: 0 0 6px;
}

.page-about .about-team__role p {
  font-size: var(--fs-small);
  color: var(--color-muted);
  line-height: 1.7;
  margin: 0;
}

/* ---------- 资质与安全 ---------- */
.page-about .about-security {
  background: var(--color-navy);
  color: #fff;
  padding: 96px 0;
  position: relative;
  overflow: hidden;
}

.page-about .about-security::after {
  content: "";
  position: absolute;
  right: -80px;
  bottom: -140px;
  width: 320px;
  height: 320px;
  border: 2px solid rgba(201, 162, 39, 0.18);
  transform: rotate(45deg);
  pointer-events: none;
}

.page-about .about-security__grid {
  display: grid;
  gap: 48px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.page-about .about-security__content h2 {
  font-family: var(--font-headline);
  font-size: var(--fs-h2);
  line-height: 1.3;
  margin: 12px 0 20px;
  color: #fff;
}

.page-about .about-security__lead {
  color: var(--about-body-light);
  font-size: var(--fs-body);
  line-height: 1.85;
  margin: 0 0 36px;
  max-width: 56ch;
}

.page-about .about-security__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-security__list li {
  display: flex;
  align-items: center;
  gap: 18px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 16px 18px;
  transition: border-color 0.2s ease;
}

.page-about .about-security__list li:hover {
  border-color: rgba(201, 162, 39, 0.4);
}

.page-about .about-security__list li span:last-child {
  color: var(--color-gray);
  font-size: var(--fs-small);
  line-height: 1.55;
}

.page-about .about-security .tag {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.2);
  font-size: var(--fs-small);
  font-family: var(--font-headline);
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 6px 10px;
  flex-shrink: 0;
  color: var(--about-body-light);
}

.page-about .about-security .tag--red {
  border-color: rgba(214, 69, 69, 0.6);
  color: #F08A8A;
}

.page-about .about-security .tag--ghost {
  border-color: rgba(255, 255, 255, 0.24);
  color: var(--color-gray);
}

.page-about .about-security__seal {
  margin: 0;
  position: relative;
  justify-self: center;
}

.page-about .about-security__seal img {
  display: block;
  width: 100%;
  max-width: 300px;
  height: auto;
  border: 1px solid rgba(201, 162, 39, 0.3);
  background: rgba(255, 255, 255, 0.04);
}

/* ---------- 合作与生态 ---------- */
.page-about .about-ecosystem {
  background: var(--color-paper);
  padding: 96px 0;
}

.page-about .about-ecosystem__header h2 {
  font-family: var(--font-headline);
  font-size: var(--fs-h2);
  line-height: 1.3;
  color: var(--color-ink);
  margin: 12px 0 10px;
}

.page-about .about-ecosystem__header .section__lead {
  color: var(--color-muted);
  font-size: var(--fs-small);
  line-height: 1.7;
  margin: 0;
}

.page-about .about-ecosystem__grid {
  display: grid;
  gap: 20px;
  margin-top: 48px;
}

.page-about .about-ecosystem__card {
  background: var(--color-card);
  border: 1px solid rgba(138, 155, 168, 0.4);
  border-left: 4px solid var(--color-gold);
  padding: 28px 24px;
  position: relative;
  transition: border-color 0.22s ease, box-shadow 0.22s ease;
}

.page-about .about-ecosystem__card:hover {
  border-left-color: var(--color-gold-light);
  border-top-color: rgba(201, 162, 39, 0.4);
  border-right-color: rgba(201, 162, 39, 0.4);
  border-bottom-color: rgba(201, 162, 39, 0.4);
  box-shadow: 0 12px 28px rgba(10, 31, 68, 0.14), 0 0 0 1px rgba(201, 162, 39, 0.16);
}

.page-about .about-ecosystem__num {
  display: inline-block;
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: var(--fs-h3);
  color: var(--color-gold);
  margin-bottom: 14px;
  letter-spacing: 0.05em;
}

.page-about .about-ecosystem__card h3 {
  font-family: var(--font-headline);
  font-size: var(--fs-h3);
  font-weight: 700;
  color: var(--color-ink);
  margin: 0 0 10px;
}

.page-about .about-ecosystem__card p {
  font-size: var(--fs-small);
  color: var(--color-muted);
  line-height: 1.75;
  margin: 0;
}

.page-about .about-ecosystem__cta {
  margin-top: 48px;
  background: var(--color-navy);
  border-left: 4px solid var(--color-gold);
  border-right: 1px solid rgba(255, 255, 255, 0.08);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  align-items: flex-start;
}

.page-about .about-ecosystem__cta p {
  color: var(--about-body-light);
  font-size: var(--fs-body);
  line-height: 1.7;
  margin: 0;
  flex: 1;
}

.page-about .about-ecosystem__cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ==========================================================
   桌面端布局增强 · min-width: 960px
   ========================================================== */
@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 88px 0 96px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 80px;
    align-items: center;
  }

  .page-about .about-hero__aside {
    border-top: none;
    border-left: 1px solid var(--about-soft-line);
    padding-top: 0;
    padding-left: 40px;
  }

  .page-about .about-story__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 72px;
  }

  .page-about .about-timeline__layout {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 64px;
  }

  .page-about .about-timeline__map-overlay {
    left: 18px;
    right: 18px;
    bottom: 18px;
    padding: 20px 22px;
  }

  .page-about .about-team__stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
  }

  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 56px;
  }

  .page-about .about-security__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 72px;
  }

  .page-about .about-security__seal {
    justify-self: end;
  }

  .page-about .about-ecosystem__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .page-about .about-ecosystem__cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 28px;
    padding: 36px 40px;
  }
}

/* ==========================================================
   大屏微调 · min-width: 1200px
   ========================================================== */
@media (min-width: 1200px) {
  .page-about .about-hero__inner {
    gap: 100px;
  }

  .page-about .about-timeline__layout {
    gap: 80px;
  }

  .page-about .about-team__layout {
    gap: 72px;
  }

  .page-about .about-security__grid {
    gap: 88px;
  }
}