/* ============================================
   .page-about — 品牌介绍页专属样式
   ============================================ */

.page-about {
  --slant-deg: -2deg;
  --tl-dot-size: 24px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding-top: 24px;
}

.page-about .breadcrumbs ol {
  padding: 0;
  margin: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .breadcrumbs li {
  font-size: var(--fs-small);
  color: var(--c-text-2);
}

.page-about .breadcrumbs li:not(:last-child)::after {
  content: "·";
  margin-left: 8px;
  color: var(--c-accent);
  font-weight: 700;
}

.page-about .breadcrumbs a {
  color: var(--c-primary);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease;
}

.page-about .breadcrumbs a:hover {
  border-bottom-color: var(--c-accent);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: 24px;
  background: var(--c-primary);
  background-image:
    linear-gradient(135deg, rgba(18, 59, 109, 0.4) 0%, transparent 55%),
    linear-gradient(315deg, rgba(255, 107, 53, 0.12) 0%, transparent 40%);
  color: var(--c-white);
  isolation: isolate;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -60px;
  width: 280px;
  height: 280px;
  border: 2px solid rgba(255, 107, 53, 0.45);
  transform: rotate(12deg);
  z-index: -1;
}

.page-about .about-hero::after {
  content: "V4";
  position: absolute;
  right: 64px;
  bottom: 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-style: italic;
  font-size: 88px;
  line-height: 1;
  color: rgba(255, 255, 255, 0.04);
  z-index: -1;
}

.page-about .about-hero-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 48px;
  padding-top: 64px;
  padding-bottom: 64px;
}

.page-about .about-hero-copy {
  flex: 1 1 auto;
  max-width: 720px;
}

.page-about .about-hero-kicker {
  display: inline-block;
  background: var(--c-accent);
  color: var(--c-white);
  font-weight: 700;
  font-size: var(--fs-micro);
  letter-spacing: 0.12em;
  padding: 6px 12px;
  margin: 0 0 24px;
  transform: skewX(-6deg);
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  font-size: clamp(28px, 4.5vw, 52px);
  line-height: 1.15;
  font-weight: 900;
  color: var(--c-white);
}

.page-about .about-hero-lead {
  margin: 0 0 32px;
  font-size: var(--fs-subtitle);
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.88);
  max-width: 640px;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.page-about .about-hero-year-wrap {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 24px;
}

.page-about .about-hero-year {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(72px, 11vw, 170px);
  line-height: 0.78;
  letter-spacing: -0.02em;
  color: var(--c-white);
  padding-bottom: 18px;
  border-bottom: 14px solid var(--c-accent);
}

.page-about .about-hero-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.35);
}

.page-about .about-hero-facts li {
  display: flex;
  justify-content: space-between;
  gap: 32px;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
  font-size: var(--fs-micro);
  color: rgba(255, 255, 255, 0.7);
}

.page-about .about-hero-facts strong {
  color: var(--c-white);
  font-family: var(--font-display);
  font-size: var(--fs-small);
  font-weight: 800;
}

.page-about .about-hero .btn-primary {
  background: var(--c-accent);
  color: var(--c-white);
  border-color: var(--c-accent);
}

.page-about .about-hero .btn-primary:hover {
  background: var(--c-white);
  color: var(--c-primary);
  border-color: var(--c-white);
  box-shadow: var(--shadow-md);
}

.page-about .about-hero .btn-outline {
  background: transparent;
  color: var(--c-white);
  border-color: rgba(255, 255, 255, 0.5);
}

.page-about .about-hero .btn-outline:hover {
  background: var(--c-primary-hover);
  border-color: var(--c-accent);
  color: var(--c-accent-soft);
}

/* ---------- 品牌起源 ---------- */
.page-about .about-origin {
  padding-top: 80px;
  padding-bottom: 80px;
}

.page-about .about-origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
}

@media (min-width: 768px) {
  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: center;
  }
}

.page-about .about-origin-media {
  position: relative;
}

.page-about .media-frame {
  position: relative;
  overflow: hidden;
  background: var(--c-gray);
}

.page-about .media-frame img,
.page-about .about-slant img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-slant {
  border: 8px solid var(--c-border);
  box-shadow: var(--shadow-lg);
  transform: skewX(var(--slant-deg));
  transition: transform .35s ease, box-shadow .35s ease;
}

.page-about .about-slant::after {
  content: "";
  position: absolute;
  right: -24px;
  bottom: -24px;
  width: 96px;
  height: 96px;
  background: var(--c-accent);
  z-index: 2;
}

.page-about .about-slant:hover {
  transform: skewX(var(--slant-deg)) rotate(-1.2deg);
  box-shadow: var(--shadow-lg), 0 0 0 4px rgba(255, 107, 53, 0.25);
}

.page-about .about-slant-right {
  transform: skewX(2deg);
}

.page-about .about-slant-right:hover {
  transform: skewX(2deg) rotate(1.2deg);
}

.page-about .about-tape {
  position: absolute;
  left: -10px;
  bottom: 28px;
  background: var(--c-accent);
  color: var(--c-white);
  font-size: var(--fs-small);
  font-weight: 700;
  padding: 6px 16px;
  transform: rotate(-6deg);
  box-shadow: var(--shadow-sm);
  z-index: 3;
}

.page-about .about-origin-copy .about-copy-lead {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-subtitle);
  color: var(--c-primary);
  border-left: 6px solid var(--c-accent);
  padding-left: 16px;
  margin: 20px 0;
}

.page-about .about-origin-copy p {
  margin: 0 0 16px;
  line-height: 1.9;
  color: var(--c-text);
}

/* ---------- 按钮通用 ---------- */
.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--fs-small);
  line-height: 1;
  padding: 14px 24px;
  border: 2px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: color .2s ease, background-color .2s ease, border-color .2s ease, box-shadow .2s ease;
}

.page-about .btn-ghost {
  background: transparent;
  color: var(--c-primary);
  border-color: var(--c-primary);
}

.page-about .btn-ghost:hover {
  background: var(--c-primary);
  color: var(--c-white);
  border-color: var(--c-primary);
  box-shadow: var(--shadow-sm);
}

.page-about .btn-primary {
  background: var(--c-accent);
  color: var(--c-white);
  border-color: var(--c-accent);
}

.page-about .btn-primary:hover {
  background: var(--c-primary-hover);
  border-color: var(--c-primary-hover);
  color: var(--c-white);
  box-shadow: var(--shadow-md);
}

.page-about .btn-outline {
  background: transparent;
  color: var(--c-primary);
  border-color: var(--c-primary);
}

.page-about .btn-outline:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
  background: rgba(255, 107, 53, 0.08);
}

/* ---------- 区块标题与说明 ---------- */
.page-about .section-note {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: var(--fs-micro);
  letter-spacing: 0.14em;
  color: var(--c-accent);
  background: rgba(255, 107, 53, 0.12);
  padding: 4px 10px;
  margin: 0 0 16px;
  transform: skewX(-6deg);
  text-transform: uppercase;
}

.page-about .section-title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 4vw, 46px);
  letter-spacing: -0.01em;
  line-height: 1.1;
  color: var(--c-primary);
}

.page-about .about-sec-head {
  max-width: 640px;
  margin-bottom: 48px;
}

.page-about .about-sec-lead {
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--c-text-2);
  margin: 0;
}

/* ---------- 发展历程时间线 ---------- */
.page-about .about-timeline {
  background: var(--c-gray);
  padding-top: 80px;
  padding-bottom: 80px;
}

.page-about .about-tl-track {
  position: relative;
  padding-left: 28px;
  padding-top: 8px;
  padding-bottom: 8px;
}

.page-about .about-tl-track::before {
  content: "";
  position: absolute;
  left: 38px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: repeating-linear-gradient(
    180deg,
    var(--c-primary) 0,
    var(--c-primary) 10px,
    transparent 10px,
    transparent 18px
  );
  border-radius: 2px;
  opacity: 0.85;
}

.page-about .about-tl-row {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 40px;
}

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

.page-about .about-tl-dot {
  flex: 0 0 var(--tl-dot-size);
  width: var(--tl-dot-size);
  height: var(--tl-dot-size);
  border-radius: 50%;
  background: var(--c-primary);
  border: 4px solid var(--c-white);
  outline: 2px solid var(--c-accent);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.2);
  order: -1;
  margin-top: 22px;
  z-index: 1;
}

.page-about .about-tl-card {
  flex: 1 1 auto;
  background: var(--c-white);
  border: 1px solid var(--c-border);
  box-shadow: var(--shadow-sm);
  padding: 20px 24px;
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}

.page-about .about-tl-card:hover {
  border-color: var(--c-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.page-about .about-tl-tag {
  display: inline-block;
  font-size: var(--fs-micro);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-accent);
  background: rgba(255, 107, 53, 0.12);
  padding: 3px 8px;
}

.page-about .about-tl-year {
  display: block;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: 48px;
  line-height: 1.05;
  color: var(--c-primary);
  margin-top: 12px;
}

.page-about .about-tl-card h3 {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-subtitle);
  color: var(--c-primary);
  line-height: 1.3;
}

.page-about .about-tl-card p {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: var(--c-text-2);
}

.page-about .about-tl-chart-wrap {
  max-width: 820px;
  margin: 56px 0 0;
}

.page-about .about-tl-chart {
  border: 1px solid var(--c-border);
  box-shadow: var(--shadow-sm);
  background: var(--c-white);
}

.page-about .about-chart-caption {
  margin: 12px 0 0;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-small);
  color: var(--c-text-2);
}

.page-about .about-chart-caption::before {
  content: "";
  width: 28px;
  height: 4px;
  background: var(--c-accent);
}

/* ---------- 时间线桌面切换 ---------- */
@media (min-width: 768px) {
  .page-about .about-tl-track {
    padding-left: 0;
    padding-top: 16px;
    padding-bottom: 16px;
  }

  .page-about .about-tl-track::before {
    left: 50%;
    width: 4px;
    transform: translateX(-50%);
    background: repeating-linear-gradient(
      180deg,
      var(--c-primary) 0,
      var(--c-primary) 8px,
      var(--c-accent) 8px,
      var(--c-accent) 12px,
      var(--c-primary) 12px,
      var(--c-primary) 22px,
      transparent 22px,
      transparent 32px
    );
    opacity: 1;
  }

  .page-about .about-tl-row {
    display: grid;
    grid-template-columns: 1fr 48px 1fr;
    grid-template-areas: "card dot .";
    gap: 0 32px;
    margin-bottom: 48px;
  }

  .page-about .about-tl-row.is-right {
    grid-template-areas: ". dot card";
  }

  .page-about .about-tl-dot {
    grid-area: dot;
    justify-self: center;
    margin-top: 30px;
  }

  .page-about .about-tl-card {
    grid-area: card;
    text-align: left;
  }

  .page-about .about-tl-row.is-left .about-tl-card {
    text-align: right;
  }

  .page-about .about-tl-year {
    font-size: 56px;
  }
}

/* ---------- 技术实力 ---------- */
.page-about .about-tech {
  background: var(--c-primary);
  color: var(--c-white);
  position: relative;
  overflow: hidden;
  padding-top: 80px;
  padding-bottom: 80px;
}

.page-about .about-tech::before {
  content: "";
  position: absolute;
  left: -10%;
  bottom: -12%;
  width: 60%;
  height: 100%;
  transform: skewX(-12deg);
  background: rgba(255, 107, 53, 0.1);
  pointer-events: none;
}

.page-about .about-tech::after {
  content: "LEYU DATA SYSTEM";
  position: absolute;
  right: -30px;
  top: 28px;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: 44px;
  line-height: 1;
  color: rgba(255, 255, 255, 0.03);
  letter-spacing: 0.02em;
  pointer-events: none;
}

.page-about .about-tech-head {
  max-width: 560px;
  margin-bottom: 40px;
}

.page-about .about-tech .section-note {
  background: rgba(255, 255, 255, 0.12);
  color: var(--c-accent-soft);
}

.page-about .about-tech .section-title {
  color: var(--c-white);
}

.page-about .about-tech-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  position: relative;
  z-index: 1;
}

@media (min-width: 900px) {
  .page-about .about-tech-grid {
    grid-template-columns: 7fr 5fr;
    gap: 64px;
    align-items: center;
  }
}

.page-about .about-tech-copy .about-copy-lead {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-subtitle);
  color: var(--c-accent);
  border-left: 6px solid var(--c-accent);
  padding-left: 16px;
  margin: 20px 0;
}

.page-about .about-tech-copy p {
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.82);
  margin: 0 0 18px;
}

.page-about .about-tech .btn {
  margin-top: 12px;
}

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

@media (min-width: 480px) and (max-width: 899px) {
  .page-about .about-tech-stats {
    grid-template-columns: repeat(3, 1fr);
  }
}

.page-about .about-stat {
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-top: 4px solid var(--c-accent);
  background: rgba(255, 255, 255, 0.06);
  padding: 18px 12px;
  text-align: center;
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(34px, 4vw, 56px);
  line-height: 1;
  color: var(--c-accent);
}

.page-about .about-stat-num em {
  font-style: normal;
  font-size: 0.6em;
  color: var(--c-accent-soft);
  vertical-align: top;
}

.page-about .about-stat-label {
  display: block;
  margin-top: 8px;
  font-size: var(--fs-micro);
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.8);
}

.page-about .about-tech-media {
  margin-top: 48px;
  display: flex;
  justify-content: flex-end;
  position: relative;
  z-index: 1;
}

.page-about .about-tech-media .media-frame {
  max-width: 620px;
  width: 100%;
  background: var(--c-primary-hover);
}

/* ---------- 用户服务理念 ---------- */
.page-about .about-service {
  background: var(--c-white);
  padding-top: 80px;
  padding-bottom: 80px;
}

.page-about .about-service-list {
  border-top: 3px solid var(--c-border);
}

.page-about .about-service-row {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 24px;
  padding: 32px 0;
  border-bottom: 1px solid rgba(10, 31, 68, 0.15);
  transition: background-color .3s ease;
}

.page-about .about-service-row:hover {
  background: var(--c-gray);
}

.page-about .about-service-idx {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: 32px;
  color: var(--c-accent);
  line-height: 1;
  padding-top: 6px;
}

.page-about .about-service-body h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-subtitle);
  color: var(--c-primary);
}

.page-about .about-service-body p {
  margin: 0;
  line-height: 1.8;
  color: var(--c-text-2);
  max-width: 720px;
}

/* ---------- 资质与认证 ---------- */
.page-about .about-credential {
  position: relative;
  background: var(--c-gray);
  padding-top: 80px;
  padding-bottom: 80px;
  overflow: hidden;
}

.page-about .about-credential::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(10, 31, 68, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(10, 31, 68, 0.08) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: radial-gradient(ellipse at center, #000 30%, transparent 82%);
  mask-image: radial-gradient(ellipse at center, #000 30%, transparent 82%);
  pointer-events: none;
}

.page-about .about-cred-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

@media (min-width: 900px) {
  .page-about .about-cred-grid {
    grid-template-columns: 8fr 4fr;
    gap: 64px;
  }
}

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

.page-about .about-cred-list li {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 20px;
  margin: 0 0 20px;
  padding: 20px;
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-left: 8px solid var(--c-accent);
  box-shadow: var(--shadow-sm);
  transition: box-shadow .25s ease, transform .25s ease;
}

.page-about .about-cred-list li:hover {
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

.page-about .about-cred-badge {
  font-family: var(--font-display);
  font-weight: 900;
  font-style: italic;
  font-size: var(--fs-small);
  color: var(--c-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: rgba(255, 107, 53, 0.1);
  height: 56px;
  align-self: center;
  transform: skewX(-6deg);
}

.page-about .about-cred-list h3 {
  margin: 0 0 6px;
  font-size: var(--fs-subtitle);
  font-family: var(--font-display);
  font-weight: 800;
  color: var(--c-primary);
}

.page-about .about-cred-list p {
  margin: 0;
  font-size: var(--fs-small);
  color: var(--c-text-2);
  line-height: 1.8;
}

.page-about .about-cred-side {
  background: var(--c-primary);
  color: var(--c-white);
  padding: 28px 28px 20px;
  box-shadow: var(--shadow-md);
}

.page-about .about-cred-tip {
  margin: 0 0 12px;
  font-size: var(--fs-micro);
  letter-spacing: 0.12em;
  color: var(--c-accent-soft);
}

.page-about .about-cred-side ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.page-about .about-cred-side li {
  padding: 10px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.page-about .about-cred-side li:last-child {
  border-bottom: none;
}

.page-about .about-cred-side a {
  color: var(--c-white);
  font-weight: 600;
  font-size: var(--fs-small);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: color .2s ease;
}

.page-about .about-cred-side a:hover {
  color: var(--c-accent-soft);
}

.page-about .about-cred-side a::after {
  content: "→";
  color: var(--c-accent);
  transition: transform .2s ease;
}

.page-about .about-cred-side a:hover::after {
  transform: translateX(4px);
}

/* ---------- 移动端细节优化 ---------- */
@media (max-width: 480px) {
  .page-about .about-hero-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 40px;
    padding-top: 48px;
    padding-bottom: 48px;
  }

  .page-about .about-hero-year {
    font-size: 88px;
  }

  .page-about .about-hero-year-wrap {
    align-items: flex-start;
  }

  .page-about .about-hero-facts {
    width: 100%;
  }

  .page-about .about-tech-stats {
    grid-template-columns: 1fr;
  }

  .page-about .about-stat {
    display: flex;
    align-items: center;
    justify-content: space-between;
    text-align: right;
    padding: 16px 20px;
  }

  .page-about .about-stat-label {
    margin-top: 0;
  }

  .page-about .about-tl-row {
    gap: 14px;
  }

  .page-about .about-tl-card {
    padding: 16px 18px;
  }

  .page-about .about-tl-year {
    font-size: 38px;
  }

  .page-about .about-cred-list li {
    grid-template-columns: 52px 1fr;
    gap: 16px;
    padding: 16px;
  }

  .page-about .about-service-row {
    grid-template-columns: 44px 1fr;
    gap: 16px;
    padding: 24px 0;
  }
}