/* ===== 品牌概况页专属样式 ===== */
.page-about {
  --about-muted: rgba(245, 245, 240, 0.72);
  --about-line-dark: rgba(255, 255, 255, 0.16);
  background: var(--c-white);
  color: var(--c-dark);
}

/* ---------- HERO ---------- */
.page-about .page-about__hero {
  background:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    radial-gradient(circle at 85% 15%, rgba(255, 77, 0, 0.16), transparent 30%),
    linear-gradient(120deg, var(--c-dark) 0%, #0d1627 55%, #142033 100%);
  background-size: 56px 56px, 56px 56px, auto, auto;
  color: var(--c-white);
  position: relative;
  overflow: hidden;
}

.page-about__hero-inner {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  align-items: center;
  position: relative;
  z-index: 1;
}

.page-about__hero-copy {
  max-width: 660px;
}

.page-about__hero-accent {
  display: block;
  color: var(--c-primary);
}

.page-about__hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  margin-top: 32px;
}

.page-about__hero-media {
  position: relative;
}

.page-about__hero-corners {
  position: absolute;
  top: -14px;
  left: -14px;
  width: 72px;
  height: 72px;
  border-top: 3px solid var(--c-primary);
  border-left: 3px solid var(--c-primary);
  z-index: 2;
  pointer-events: none;
}

.page-about__hero-img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid rgba(255, 255, 255, 0.14);
  box-shadow: var(--shadow-float);
}

.page-about__hero-coord {
  position: absolute;
  right: 14px;
  bottom: 14px;
  background: var(--c-primary);
  color: var(--c-white);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  padding: 8px 12px;
  z-index: 2;
}

/* ---------- 章节标题 ---------- */
.page-about__section-head {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: end;
  column-gap: 18px;
  margin-bottom: clamp(32px, 6vw, 64px);
}

.page-about__section-head .num-tag {
  grid-row: 1 / span 2;
}

.page-about__section-head .eyebrow {
  grid-column: 2;
  align-self: end;
  margin: 0;
}

.page-about__section-head .section-title {
  grid-column: 2;
  align-self: start;
  margin: 0;
  letter-spacing: -0.02em;
}

.page-about__section-head--light .eyebrow {
  color: rgba(255, 255, 255, 0.55);
}

.page-about__section-head--light .section-title {
  color: var(--c-white);
}

/* ---------- 品牌原则 ---------- */
.page-about .page-about__principles {
  background: var(--c-paper);
}

.page-about__principles-grid {
  display: grid;
  gap: var(--gap);
}

.page-about__principle {
  padding: clamp(24px, 4vw, 40px);
  border: 1px solid var(--c-line);
  box-shadow: var(--shadow-panel);
  position: relative;
}

.page-about__principle--paper {
  background: var(--c-white);
}

.page-about__principle--paper h3 {
  color: var(--c-dark);
}

.page-about__principle--primary {
  background: var(--c-dark);
  border-color: var(--c-dark);
  color: var(--c-white);
}

.page-about__principle--primary h3 {
  color: var(--c-white);
}

.page-about__principle--primary p {
  color: rgba(255, 255, 255, 0.72);
}

.page-about__principle--quote {
  border-left: 6px solid var(--c-primary);
  padding: 28px 32px;
  background: var(--c-white);
}

.page-about__principle-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--c-primary);
}

.page-about__principle h3 {
  margin: 10px 0 10px;
  font-size: clamp(1.45rem, 3vw, 2rem);
  font-weight: 900;
  letter-spacing: -0.02em;
}

.page-about__principle p {
  margin: 0;
  max-width: 60ch;
  line-height: 1.7;
  color: var(--c-ink);
}

.page-about__principle--quote p {
  color: var(--c-ink);
  font-size: 1.05rem;
  line-height: 1.7;
}

@media (min-width: 880px) {
  .page-about__principles-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about__principle--primary,
  .page-about__principle--quote {
    grid-column: 1 / -1;
  }
}

/* ---------- 发展时间轴 ---------- */
.page-about .page-about__timeline-section {
  background:
    radial-gradient(circle at 10% 0, rgba(255, 77, 0, 0.12), transparent 30%),
    var(--c-dark);
  color: var(--c-white);
}

.page-about__timeline-wrap {
  display: grid;
  gap: 48px;
}

.page-about__timeline {
  list-style: none;
  margin: 0;
  padding: 8px 0 0;
  position: relative;
}

.page-about__milestone {
  position: relative;
  padding: 0 0 40px 40px;
}

.page-about__milestone::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 14px;
  height: 14px;
  background: var(--c-primary);
  transform: rotate(45deg);
  box-shadow: 0 0 0 4px rgba(255, 77, 0, 0.16);
  z-index: 1;
}

.page-about__milestone::after {
  content: '';
  position: absolute;
  left: 6px;
  top: 24px;
  bottom: 0;
  width: 2px;
  background: repeating-linear-gradient(to bottom, var(--about-line-dark) 0 4px, transparent 4px 8px);
}

.page-about__milestone:last-child::after {
  display: none;
}

.page-about__milestone-body {
  border-bottom: 1px solid var(--about-line-dark);
  padding-bottom: 24px;
}

.page-about__milestone:last-child .page-about__milestone-body {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about__milestone-year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--c-white);
  margin-bottom: 6px;
}

.page-about__milestone-body h3 {
  margin: 0 0 6px;
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--c-white);
}

.page-about__milestone-body p {
  margin: 0;
  max-width: 52ch;
  line-height: 1.7;
  color: var(--about-muted);
}

.page-about__timeline-img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--about-line-dark);
  padding: 6px;
  background: rgba(255, 255, 255, 0.04);
}

.page-about__timeline-note {
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--about-muted);
  border-left: 3px solid var(--c-primary);
  padding-left: 14px;
}

@media (min-width: 980px) {
  .page-about__timeline-wrap {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-about__timeline-fig {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }
}

/* ---------- 数据能力 ---------- */
.page-about .page-about__capability {
  background: var(--c-paper);
}

.page-about__capability-grid {
  display: grid;
  gap: 48px;
  align-items: center;
}

@media (min-width: 960px) {
  .page-about__capability-grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  }
}

.page-about__capability-copy .lede {
  margin-bottom: 20px;
}

.page-about__capability-list {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
}

.page-about__capability-list li {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 14px 0;
  border-bottom: 1px solid var(--c-line);
}

.page-about__capability-list strong {
  font-weight: 800;
  color: var(--c-dark);
  white-space: nowrap;
}

.page-about__capability-chart {
  background: var(--c-white);
  border: 1px solid var(--c-line);
  box-shadow: var(--shadow-float);
  padding: clamp(20px, 3vw, 32px);
  position: relative;
}

.page-about__capability-chart::before {
  content: 'DATA';
  position: absolute;
  top: -12px;
  right: 16px;
  background: var(--c-dark);
  color: var(--c-white);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  padding: 4px 10px;
}

.page-about__bar-row {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.page-about__bar-label {
  font-size: 0.82rem;
  font-weight: 800;
  line-height: 1.3;
  color: var(--c-ink);
}

.page-about__bar-track {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  height: 40px;
  background: linear-gradient(to right, rgba(10, 15, 26, 0.04), rgba(10, 15, 26, 0.1));
  overflow: hidden;
  padding-right: 8px;
}

.page-about__bar-fill {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  width: var(--bar, 100%);
  height: 100%;
  box-sizing: border-box;
  padding-right: 12px;
  background: linear-gradient(90deg, var(--c-dark) 0%, var(--c-primary) 100%);
  color: var(--c-white);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  white-space: nowrap;
  transform-origin: left center;
  animation: page-about-bar-in 1s var(--ease-out) both;
}

@keyframes page-about-bar-in {
  from {
    transform: scaleX(0);
  }
  to {
    transform: scaleX(1);
  }
}

.page-about__chart-note {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--c-ink);
  opacity: 0.7;
}

@media (prefers-reduced-motion: reduce) {
  .page-about__bar-fill {
    animation: none;
  }
}

/* ---------- 团队与资质 ---------- */
.page-about .page-about__team {
  background: var(--c-white);
}

.page-about__team-wrap {
  align-items: center;
}

.page-about__team-copy .lede {
  margin-bottom: 12px;
}

.page-about__team-text {
  max-width: 62ch;
  line-height: 1.8;
  color: var(--c-ink);
}

.page-about__cert-grid {
  display: grid;
  gap: var(--gap);
  margin: 32px 0;
}

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

.page-about__cert {
  background: var(--c-paper);
  border-top: 4px solid var(--c-dark);
  padding: 22px 22px 26px;
  position: relative;
}

.page-about__cert h3 {
  margin: 14px 0 8px;
  font-size: 1.05rem;
  font-weight: 900;
  color: var(--c-dark);
}

.page-about__cert p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--c-ink);
}

.page-about__team-image {
  display: block;
  width: 100%;
  height: auto;
  max-width: 680px;
  margin-left: auto;
  object-fit: cover;
  border: 1px solid var(--c-line);
  box-shadow: var(--shadow-float);
}

/* ---------- 合作生态 ---------- */
.page-about .page-about__ecosystem {
  background:
    linear-gradient(135deg, rgba(255, 77, 0, 0.06), transparent 40%),
    var(--c-dark);
  color: var(--c-white);
}

.page-about__ecosystem .lede {
  max-width: 58ch;
  color: var(--about-muted);
}

.page-about__ecosystem-list {
  display: grid;
  gap: var(--gap);
  margin: 40px 0 36px;
}

@media (min-width: 880px) {
  .page-about__ecosystem-list {
    grid-template-columns: repeat(3, 1fr);
  }
}

.page-about__ecosystem-item {
  position: relative;
  border-left: 3px solid var(--c-primary);
  padding: 8px 0 8px 22px;
}

.page-about__ecosystem-item h3 {
  margin: 8px 0 10px;
  font-size: 1.15rem;
  font-weight: 900;
  color: var(--c-white);
}

.page-about__ecosystem-item p {
  margin: 0;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.68);
}

.page-about__ecosystem-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--c-primary);
}

.page-about__tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 32px 0 44px;
}

.page-about__tag {
  display: inline-flex;
  align-items: center;
  border: 1px solid rgba(255, 255, 255, 0.22);
  color: rgba(255, 255, 255, 0.84);
  background: transparent;
  padding: 9px 15px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  line-height: 1.4;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.page-about__tag:hover {
  background: var(--c-primary);
  border-color: var(--c-primary);
  color: var(--c-white);
  transform: translateY(-2px);
}

.page-about__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

/* ---------- 移动端细节优化 ---------- */
@media (max-width: 640px) {
  .page-about__hero-coord {
    font-size: 0.68rem;
    padding: 6px 10px;
    right: 10px;
    bottom: 10px;
  }

  .page-about__bar-row {
    grid-template-columns: 70px minmax(0, 1fr);
    gap: 10px;
  }

  .page-about__bar-fill {
    font-size: 0.78rem;
    padding-right: 8px;
  }
}

.page-about {
  --bar: 1rem;
}