/* ========== 品牌概况 · page-about ========== */

.page-about {
  --about-ink-deep: #071721;
}

.page-about .container {
  width: min(var(--container), 100%);
  margin-inline: auto;
  padding-inline: 20px;
}

.page-about > .breadcrumbs {
  padding-block: 88px 0;
  font-family: var(--font-data);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--slate);
}

.page-about .breadcrumbs a {
  color: var(--slate);
  text-decoration: underline;
  text-decoration-color: transparent;
  transition: color var(--dur) var(--ease), text-decoration-color var(--dur) var(--ease);
}

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

.page-about .breadcrumbs .sep {
  margin-inline: 10px;
  color: var(--gold);
}

.page-about section {
  padding-block: 72px;
}

.page-about .section-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 18px;
}

.page-about .chapter-number {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 900;
  color: transparent;
  -webkit-text-stroke: 1px var(--gold);
  line-height: 1;
}

.page-about .section-hint {
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--slate);
  padding-top: 4px;
}

/* ---------- 01 品牌信条 ---------- */

.page-about .about-manifesto {
  background: var(--paper);
  padding-top: 0;
}

.page-about .manifesto-grid {
  display: grid;
  gap: 40px;
  align-items: start;
  margin-top: 32px;
}

.page-about .manifesto-copy > h1 {
  margin: 20px 0 28px;
}

.page-about .manifesto-h1-kicker {
  display: block;
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--red);
  letter-spacing: 0.14em;
  margin-bottom: 12px;
}

.page-about .manifesto-h1-main {
  display: block;
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 900;
  line-height: 1.15;
  color: var(--ink);
}

.page-about .manifesto-lead {
  font-family: var(--font-body);
  font-size: clamp(1.125rem, 1.5vw, 1.375rem);
  line-height: 1.9;
  color: var(--charcoal);
  margin-bottom: 20px;
}

.page-about .manifesto-body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.9;
  color: var(--slate);
}

.page-about .manifesto-principles {
  margin: 32px 0 0;
  padding: 0;
  border-top: 1px solid var(--gold-light);
}

.page-about .principle-item {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 16px;
  padding-block: 16px;
  border-bottom: 1px solid var(--gold-light);
}

.page-about .principle-item dt {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.0625rem;
  color: var(--ink);
}

.page-about .principle-item dd {
  margin: 0;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .manifesto-cta {
  margin-top: 32px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.page-about .manifesto-media {
  margin: 0;
  padding: 10px;
  background: #fff;
  border: 1px solid var(--gold-light);
  box-shadow: 10px 10px 0 rgba(11, 29, 42, 0.08);
}

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

.page-about .media-caption {
  margin-top: 12px;
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--slate);
  line-height: 1.6;
}

/* ---------- 02 发展时间轴 ---------- */

.page-about .about-timeline {
  background: var(--ink);
  color: var(--paper);
}

.page-about .about-timeline .section-hint {
  color: var(--cyan-gray);
}

.page-about .timeline-title-row {
  margin-top: 20px;
  margin-bottom: 40px;
}

.page-about .timeline-title-row h2 {
  color: var(--paper);
  margin-bottom: 8px;
}

.page-about .timeline-subtitle {
  color: var(--cyan-gray);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.page-about .timeline-layout {
  display: grid;
  gap: 40px;
}

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

.page-about .timeline-list::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--gold), rgba(199, 164, 108, 0.15));
  opacity: 0.6;
}

.page-about .timeline-item {
  position: relative;
  padding: 0 0 40px 48px;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 4px;
  width: 16px;
  height: 16px;
  background: var(--red);
  border: 3px solid var(--ink);
  outline: 1px solid var(--gold);
  transform: rotate(45deg);
}

.page-about .timeline-card {
  position: relative;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(199, 164, 108, 0.3);
  padding: 24px 24px 20px;
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.25);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .timeline-card:hover,
.page-about .timeline-card:focus-within {
  transform: translateX(6px);
  background: rgba(199, 164, 108, 0.09);
  border-color: var(--gold);
}

.page-about .timeline-card-year {
  position: absolute;
  right: -8px;
  top: -28px;
  font-family: var(--font-display);
  font-size: 6rem;
  font-weight: 900;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(199, 164, 108, 0.35);
  pointer-events: none;
}

.page-about .timeline-card-body {
  position: relative;
  z-index: 1;
}

.page-about .timeline-card-body h3 {
  color: var(--gold-light);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.page-about .timeline-card-body p {
  color: var(--paper);
  opacity: 0.82;
  font-size: 0.9375rem;
  line-height: 1.7;
}

.page-about .timeline-card-tag {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--gold);
  border: 1px solid rgba(199, 164, 108, 0.4);
  padding: 4px 10px;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .timeline-card:hover .timeline-card-tag {
  color: var(--paper);
  background: var(--red);
  border-color: var(--red);
}

.page-about .timeline-media-item {
  position: relative;
  padding: 0 0 40px 48px;
}

.page-about .timeline-media-item::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 4px;
  width: 16px;
  height: 16px;
  background: var(--gold);
  border: 3px solid var(--ink);
  transform: rotate(45deg);
}

.page-about .timeline-media-frame {
  margin: 0;
  border: 1px solid rgba(199, 164, 108, 0.35);
  padding: 6px;
  background: rgba(255, 255, 255, 0.03);
}

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

.page-about .about-timeline .media-caption {
  color: var(--cyan-gray);
}

.page-about .timeline-note {
  border-left: 3px solid var(--gold);
  padding-left: 20px;
  align-self: start;
}

.page-about .timeline-note .meta-text {
  color: var(--gold);
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
}

.page-about .timeline-note-body {
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--cyan-gray);
  margin-top: 8px;
}

/* ---------- 03 当前规模 ---------- */

.page-about .about-scale {
  background: var(--paper);
}

.page-about .about-scale h2 {
  color: var(--ink);
  margin-bottom: 28px;
}

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

.page-about .scale-card {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--ink);
  border: 1px solid var(--gold);
  box-shadow: 6px 6px 0 rgba(11, 29, 42, 0.12);
}

.page-about .scale-card .data-panel__label {
  color: var(--gold-light);
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
}

.page-about .scale-card .data-value {
  font-size: clamp(2rem, 5vw, 2.75rem);
  line-height: 1.1;
  color: var(--gold);
}

.page-about .scale-card .data-value small {
  font-size: 0.55em;
  color: var(--gold-light);
  margin-left: 2px;
}

.page-about .scale-card-note {
  color: var(--cyan-gray);
  font-family: var(--font-body);
  font-size: 0.8125rem;
  line-height: 1.5;
}

.page-about .scale-extended {
  display: grid;
  gap: 16px;
  margin-top: 40px;
  grid-template-columns: 1fr;
}

.page-about .scale-extend-card {
  background: rgba(199, 164, 108, 0.08);
  border: 1px solid var(--gold-light);
  padding: 24px;
}

.page-about .scale-extend-card .meta-text {
  font-family: var(--font-data);
  color: var(--red);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
}

.page-about .scale-extend-card h3 {
  font-size: 1.0625rem;
  color: var(--ink);
  margin: 10px 0 8px;
  line-height: 1.4;
}

.page-about .scale-extend-card p {
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--slate);
  margin: 0;
}

.page-about .scale-tool-tip {
  margin-top: 24px;
  padding: 18px 22px;
  background: rgba(11, 29, 42, 0.04);
  border-left: 3px solid var(--gold);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 04 数据质量体系 ---------- */

.page-about .about-quality {
  background: var(--about-ink-deep);
  color: var(--paper);
}

.page-about .about-quality .section-hint {
  color: var(--cyan-gray);
}

.page-about .about-quality h2 {
  color: var(--paper);
  margin-bottom: 16px;
}

.page-about .quality-intro {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--paper);
  opacity: 0.85;
  max-width: 640px;
  margin-bottom: 36px;
}

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

.page-about .quality-step {
  padding: 24px 0;
  border-top: 1px solid rgba(199, 164, 108, 0.35);
}

.page-about .quality-step-index {
  display: block;
  font-family: var(--font-data);
  font-size: 0.875rem;
  color: var(--red);
  letter-spacing: 0.1em;
  margin-bottom: 10px;
}

.page-about .quality-step h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gold-light);
  margin-bottom: 8px;
}

.page-about .quality-step p {
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--cyan-gray);
  margin: 0;
}

@supports (animation-timeline: view()) {
  @keyframes about-quality-shine {
    from {
      opacity: 0.35;
      transform: translateY(14px);
    }
    to {
      opacity: 1;
      transform: none;
    }
  }

  .page-about .quality-step {
    animation: about-quality-shine 500ms var(--ease) both;
    animation-timeline: view();
    animation-range: entry 8% entry 40%;
  }
}

.page-about .quality-media {
  margin: 36px 0 0;
  border: 1px solid var(--gold);
  padding: 8px;
  background: rgba(255, 255, 255, 0.04);
}

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

.page-about .about-quality .media-caption {
  color: var(--cyan-gray);
}

.page-about .quality-cta {
  margin-top: 28px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

/* ---------- 05 团队与运营 ---------- */

.page-about .about-team {
  background: var(--paper);
}

.page-about .about-team h2 {
  margin-bottom: 12px;
}

.page-about .team-intro {
  font-family: var(--font-body);
  max-width: 640px;
  line-height: 1.8;
  color: var(--slate);
  margin-bottom: 36px;
}

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

.page-about .team-card {
  background: #fff;
  border: 1px solid var(--gold-light);
  box-shadow: 6px 6px 0 rgba(11, 29, 42, 0.06);
}

.page-about .team-card[open] {
  border-color: var(--gold);
}

.page-about .team-card summary {
  list-style: none;
  cursor: pointer;
  padding: 22px 48px 22px 24px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.0625rem;
  color: var(--ink);
  position: relative;
  display: block;
}

.page-about .team-card summary::-webkit-details-marker {
  display: none;
}

.page-about .team-card summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-data);
  font-size: 1.25rem;
  color: var(--red);
  transition: transform var(--dur) var(--ease);
}

.page-about .team-card[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
}

.page-about .team-card p {
  margin: 0;
  padding: 0 24px 24px;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .team-note {
  margin-top: 36px;
  padding: 28px;
  border: 1px solid var(--gold-light);
  background: rgba(199, 164, 108, 0.07);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px;
  justify-content: space-between;
}

.page-about .team-note p {
  margin: 0;
  max-width: 720px;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .team-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

/* ---------- 站内延伸阅读 ---------- */

.page-about .about-page-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  padding-block: 16px 72px;
}

.page-about .about-cross-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  border: 1px solid var(--ink);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-cross-link:hover {
  background: var(--azure);
  border-color: var(--gold);
  color: var(--paper);
}

/* ---------- 响应式：平板与桌面 ---------- */

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

  .page-about .team-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about section {
    padding-block: 96px;
  }

  .page-about > .breadcrumbs {
    padding-top: 104px;
  }

  .page-about .manifesto-grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    gap: 56px;
  }

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

  .page-about .scale-extended {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .quality-steps {
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
  }

  .page-about .quality-step {
    border-top: 0;
    padding: 0;
    border-left: 1px solid rgba(199, 164, 108, 0.35);
    padding-left: 20px;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(4, 1fr);
    align-items: start;
  }

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

@media (min-width: 1024px) {
  .page-about .timeline-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    gap: 56px;
  }

  .page-about .timeline-note {
    position: sticky;
    top: 110px;
    margin-top: 44px;
  }
}

/* ---------- 动效克制 · 无障碍 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .quality-step,
  .page-about .timeline-card,
  .page-about .timeline-card .timeline-card-tag,
  .page-about .team-card summary::after {
    animation: none !important;
    transition: none !important;
  }
}