/* ===== 品牌概况页 page-about ===== */
.page-about {
  position: relative;
  background: var(--color-bg);
  color: var(--color-text);
  overflow-x: hidden;
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  padding: 48px 0 72px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 46%;
  height: 100%;
  background: linear-gradient(210deg, rgba(255, 107, 53, 0.16), transparent 68%);
  clip-path: polygon(16% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 32px;
}

.page-about .about-hero-grid {
  position: relative;
  display: grid;
  gap: 36px;
  align-items: center;
}

.page-about .about-hero-kicker {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 4px;
  color: var(--color-accent);
  text-transform: uppercase;
  margin: 0 0 14px;
}

.page-about .about-hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(30px, 5vw, 50px);
  font-weight: 700;
  line-height: 1.12;
  margin: 0 0 18px;
  color: var(--color-text);
}

.page-about .about-hero-lead {
  font-size: 17px;
  line-height: 1.75;
  color: var(--color-text);
  margin: 0 0 16px;
  max-width: 56ch;
}

.page-about .about-hero-copy > p:not(.about-hero-lead):not(.about-hero-kicker) {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-muted);
  margin: 0 0 10px;
  max-width: 60ch;
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 26px 0 28px;
}

.page-about .about-hero-stat {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.page-about .about-hero-stat .data-num {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.2;
}

.page-about .about-hero-stat span:last-child {
  font-size: 13px;
  color: var(--color-text-muted);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero-visual {
  position: relative;
}

.page-about .about-hero-visual::after {
  content: "";
  position: absolute;
  inset: 18px -18px -18px 18px;
  border: 2px solid var(--color-secondary);
  border-radius: var(--radius);
  z-index: -1;
}

.page-about .about-hero-visual .img-frame {
  box-shadow: var(--shadow-card);
}

.page-about .about-hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  object-fit: cover;
}

/* ---------- 通用编号索引 ---------- */
.page-about .about-section-index {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 18px;
}

.page-about .about-section-no {
  font-family: var(--font-data);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-secondary);
  line-height: 1;
}

.page-about .about-section-label {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.page-about .about-mission h2,
.page-about .about-timeline-header h2,
.page-about .about-capability-copy h2,
.page-about .about-team-copy h2 {
  font-family: var(--font-heading);
  font-size: clamp(28px, 3.6vw, 40px);
  font-weight: 700;
  line-height: 1.15;
  margin: 0 0 16px;
}

/* ---------- Mission ---------- */
.page-about .about-mission {
  position: relative;
  padding: 64px 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  overflow: hidden;
}

.page-about .about-mission::after {
  content: "01";
  position: absolute;
  right: -18px;
  top: 16px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 150px;
  line-height: 1;
  color: var(--color-secondary);
  opacity: 0.07;
  pointer-events: none;
}

.page-about .about-mission-layout {
  position: relative;
  display: grid;
  gap: 24px;
}

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

.page-about .about-mission-eyebrow {
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--color-accent);
  margin: 0 0 10px;
}

.page-about .about-mission-lead {
  font-family: var(--font-heading);
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 600;
  line-height: 1.35;
  color: var(--color-text);
  margin: 0 0 18px;
}

.page-about .about-mission-content > p:not(.about-mission-eyebrow):not(.about-mission-lead) {
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-muted);
  margin: 0;
}

.page-about .about-mission-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-mission-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  line-height: 1.6;
  font-size: 14px;
}

.page-about .about-mission-list .tag {
  flex-shrink: 0;
  margin-top: 1px;
}

/* ---------- Timeline ---------- */
.page-about .about-timeline {
  padding: 64px 0;
}

.page-about .about-timeline-header {
  max-width: 680px;
  margin-bottom: 44px;
}

.page-about .about-timeline-header > p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-muted);
  margin: 0;
}

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

.page-about .about-timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 72px 20px 1fr;
  gap: 12px;
  padding-bottom: 36px;
}

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

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: 83px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
  z-index: 0;
}

.page-about .about-timeline-item:last-child::before {
  bottom: auto;
  height: 10px;
}

.page-about .about-timeline-dot {
  position: relative;
  z-index: 1;
  grid-column: 2;
  grid-row: 1;
  width: 12px;
  height: 12px;
  margin-top: 8px;
  justify-self: center;
  background: var(--color-bg);
  border: 2px solid var(--color-accent);
  transform: rotate(45deg);
}

.page-about .about-timeline-year {
  position: relative;
  z-index: 1;
  grid-column: 1;
  grid-row: 1;
  font-family: var(--font-heading);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.2;
  text-align: right;
  color: var(--color-text);
}

.page-about .about-timeline-card {
  position: relative;
  z-index: 1;
  grid-column: 3;
  grid-row: 1;
  padding: 16px 18px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-secondary);
  border-radius: var(--radius);
}

.page-about .about-timeline-lead {
  font-size: 14px;
  line-height: 1.65;
  color: var(--color-text);
  margin: 0 0 8px;
}

.page-about .about-timeline-card details summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 1px;
  color: var(--color-accent);
  user-select: none;
}

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

.page-about .about-timeline-card details summary::after {
  content: "+";
  display: inline-block;
  margin-left: 8px;
  font-weight: 700;
  color: var(--color-secondary);
  transition: transform 0.2s ease;
}

.page-about .about-timeline-card details[open] summary::after {
  transform: rotate(45deg);
}

.page-about .about-timeline-card details p {
  font-size: 13px;
  line-height: 1.75;
  color: var(--color-text-muted);
  margin: 10px 0 0;
}

/* ---------- Capability ---------- */
.page-about .about-capability {
  padding: 64px 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.page-about .about-capability-grid {
  display: grid;
  gap: 36px;
  align-items: center;
}

.page-about .about-capability-copy > p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-muted);
  margin: 0;
}

.page-about .about-capability-list {
  list-style: none;
  margin: 26px 0 28px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.page-about .about-capability-list li {
  padding: 16px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.page-about .about-capability-list .data-num {
  display: block;
  font-family: var(--font-data);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-accent);
}

.page-about .about-capability-label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--color-text-muted);
}

.page-about .about-chart-card {
  padding: 24px 20px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}

.page-about .about-chart-card h3 {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 600;
  margin: 0 0 18px;
}

.page-about .about-chart-svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-chart-grid line {
  stroke: var(--color-border);
  stroke-width: 1;
  opacity: 0.6;
}

.page-about .about-chart-point circle {
  transition: transform 0.18s ease;
  transform-box: fill-box;
  transform-origin: center;
}

.page-about .about-chart-point circle:hover {
  transform: scale(1.7);
}

.page-about .about-chart-latest {
  font-family: var(--font-data);
  font-size: 13px;
  font-weight: 700;
  fill: var(--color-accent);
}

.page-about .about-chart-caption {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 1px;
  color: var(--color-text-muted);
  margin: 16px 0 0;
}

/* ---------- Team & Awards ---------- */
.page-about .about-team {
  padding: 64px 0;
}

.page-about .about-team-grid {
  display: grid;
  gap: 36px;
  align-items: center;
}

.page-about .about-team-visual {
  position: relative;
}

.page-about .about-team-visual::before {
  content: "";
  position: absolute;
  top: -14px;
  left: -14px;
  width: 110px;
  height: 110px;
  border-top: 3px solid var(--color-accent);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius);
  z-index: 1;
  pointer-events: none;
}

.page-about .about-team-visual img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  object-fit: cover;
  box-shadow: var(--shadow-card);
}

.page-about .about-team-copy > p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-muted);
  margin: 0 0 14px;
}

.page-about .about-awards-grid {
  display: grid;
  gap: 20px;
  margin-top: 56px;
}

.page-about .about-awards-head h3 {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 700;
  margin: 0 0 10px;
}

.page-about .about-awards-lead {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-muted);
  margin: 0;
  max-width: 46ch;
}

.page-about .about-award-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-award-inner {
  display: grid;
  gap: 8px;
}

.page-about .about-award-front,
.page-about .about-award-back {
  padding: 22px 22px;
  border-radius: 0;
}

.page-about .about-award-front {
  background: var(--color-surface);
  border-top: 3px solid var(--color-secondary);
}

.page-about .about-award-back {
  background: var(--color-primary);
  border-top: 3px solid var(--color-accent);
}

.page-about .about-award-badge {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.page-about .about-award-front h3 {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 8px;
}

.page-about .about-award-note,
.page-about .about-award-back p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-muted);
  margin: 0 0 12px;
}

.page-about .about-award-back .tag {
  margin-top: auto;
}

.page-about .about-award-visual img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  object-fit: cover;
  box-shadow: var(--shadow-card);
}

/* ---------- CTA ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  background: var(--color-primary);
  border-top: 2px solid var(--color-border);
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  right: -10%;
  top: -45%;
  width: 60%;
  height: 190%;
  background: linear-gradient(150deg, var(--color-secondary) 0%, #d84418 100%);
  transform: skewX(-14deg);
  z-index: 0;
}

.page-about .about-cta-inner {
  position: relative;
  z-index: 1;
  padding: 72px 0;
  max-width: 640px;
}

.page-about .about-cta h2 {
  font-family: var(--font-heading);
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 16px;
}

.page-about .about-cta p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-muted);
  margin: 0 0 26px;
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 桌面端增强 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero-stats {
    gap: 16px;
  }

  .page-about .about-hero-stat .data-num {
    font-size: 26px;
  }

  .page-about .about-capability-list {
    gap: 16px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 64px 0 112px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: 1.08fr 0.92fr;
    gap: 56px;
  }

  .page-about .about-hero-stats {
    margin-top: 28px;
  }

  .page-about .about-mission {
    clip-path: polygon(0 4%, 100% 0, 100% 96%, 0 100%);
    padding: 92px 0;
  }

  .page-about .about-mission-layout {
    grid-template-columns: 200px 1fr;
    gap: 56px;
  }

  .page-about .about-section-index {
    margin-bottom: 0;
  }

  .page-about .about-timeline {
    padding: 96px 0 88px;
  }

  .page-about .about-timeline-item {
    grid-template-columns: 140px 28px 1fr;
    gap: 16px;
    padding-bottom: 42px;
  }

  .page-about .about-timeline-item::before {
    left: 155px;
  }

  .page-about .about-timeline-year {
    font-size: 34px;
  }

  .page-about .about-timeline-dot {
    width: 14px;
    height: 14px;
    margin-top: 6px;
  }

  .page-about .about-timeline-card {
    padding: 20px 24px;
  }

  .page-about .about-capability {
    padding: 96px 0;
  }

  .page-about .about-capability-grid {
    grid-template-columns: 1fr 1fr;
    gap: 56px;
  }

  .page-about .about-chart-card {
    padding: 28px 26px;
  }

  .page-about .about-team {
    padding: 96px 0 88px;
  }

  .page-about .about-team-grid {
    grid-template-columns: 1fr 1fr;
    gap: 56px;
  }

  .page-about .about-awards-grid {
    grid-template-columns: 220px 1fr 1fr 1.15fr;
    gap: 24px;
    align-items: stretch;
    margin-top: 72px;
  }

  .page-about .about-awards-head {
    align-self: center;
  }

  .page-about .about-cta-inner {
    padding: 96px 0;
  }
}

@media (min-width: 960px) and (hover: hover) {
  .page-about .about-award-card {
    background: none;
    border: none;
    overflow: visible;
    perspective: 1000px;
  }

  .page-about .about-award-inner {
    position: relative;
    display: block;
    min-height: 240px;
    transform-style: preserve-3d;
    transition: transform 0.5s ease;
  }

  .page-about .about-award-card:hover .about-award-inner,
  .page-about .about-award-card:focus-within .about-award-inner {
    transform: rotateY(180deg);
  }

  .page-about .about-award-front,
  .page-about .about-award-back {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    gap: 8px;
    padding: 24px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    backface-visibility: hidden;
  }

  .page-about .about-award-back {
    transform: rotateY(180deg);
  }

  .page-about .about-award-note {
    margin: 0;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .page-about .about-timeline-card details summary::after {
    transition: transform 0.2s ease;
  }

  .page-about .about-chart-point circle {
    transition: transform 0.18s ease;
  }
}