/* ============ 品牌概况页专属样式 ============ */
.page-about {
  --about-pad-y: clamp(64px, 9vw, 120px);
  --about-line: rgba(0, 168, 232, 0.28);
  background: var(--color-light);
  color: var(--color-dark);
  overflow-x: hidden;
}

/* ---------- 英雄区 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #16213B 0%, var(--color-navy) 55%, #233A66 100%);
  color: var(--color-white);
  padding: calc(var(--header-h) + 32px) 0 72px;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}
.page-about .about-hero__watermark {
  position: absolute;
  right: -14px;
  bottom: -52px;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(120px, 28vw, 260px);
  line-height: 1;
  color: rgba(255, 255, 255, 0.05);
  letter-spacing: 0.08em;
  pointer-events: none;
  user-select: none;
}
.page-about .about-hero .breadcrumb {
  position: relative;
  z-index: 2;
  margin-bottom: 36px;
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
}
.page-about .about-hero .breadcrumb a {
  color: var(--color-orange-light);
  text-decoration: none;
}
.page-about .about-hero .breadcrumb a:hover {
  text-decoration: underline;
}
.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 40px;
  align-items: center;
}
.page-about .about-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--color-orange-light);
}
.page-about .about-hero__eyebrow::before {
  content: "";
  width: 28px;
  height: 3px;
  border-radius: var(--radius-pill);
  background: var(--color-orange);
}
.page-about .about-hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(34px, 7vw, 64px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: 0.02em;
  margin-bottom: 10px;
}
.page-about .about-hero__lead {
  font-family: var(--font-heading);
  font-size: clamp(16px, 2.2vw, 22px);
  font-weight: 700;
  color: var(--color-blue);
  letter-spacing: 0.08em;
  margin-bottom: 20px;
}
.page-about .about-hero__desc {
  max-width: 520px;
  margin-bottom: 28px;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.78);
}
.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.8);
}
.page-about .about-hero__meta strong {
  font-family: var(--font-heading);
  font-weight: 900;
  color: var(--color-orange);
  margin-right: 4px;
}
.page-about .about-hero__media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 4px solid rgba(255, 255, 255, 0.08);
  box-shadow: var(--shadow-lg);
  transform: rotate(-1deg);
}
.page-about .about-hero__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

/* ---------- 01 我们是谁 ---------- */
.page-about .about-intro {
  padding: var(--about-pad-y) 0 calc(var(--about-pad-y) / 1.4);
}
.page-about .about-intro__grid {
  display: grid;
  gap: 36px;
  margin-top: 40px;
  align-items: start;
}
.page-about .about-intro__text {
  font-size: 16px;
  line-height: 1.8;
}
.page-about .about-intro__text p {
  margin-bottom: 18px;
}
.page-about .about-intro__text ul {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
}
.page-about .about-intro__text li {
  position: relative;
  padding: 10px 16px 10px 44px;
  margin-bottom: 10px;
  background: var(--color-white);
  border-left: 4px solid var(--color-orange);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  font-size: 15px;
  line-height: 1.6;
}
.page-about .about-intro__text li::before {
  content: "▸";
  position: absolute;
  left: 16px;
  top: 10px;
  color: var(--color-blue);
  font-weight: 900;
}
.page-about .about-intro__more a,
.page-about .about-cta__contact a {
  color: var(--color-blue-dark);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--color-blue);
}
.page-about .about-intro__more a:hover,
.page-about .about-cta__contact a:hover {
  color: var(--color-orange);
  border-bottom-color: var(--color-orange);
}
.page-about .about-intro__card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  border-top: 6px solid var(--color-blue);
  box-shadow: var(--shadow-md);
  padding: 28px;
}
.page-about .about-intro__card h3 {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 900;
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-light);
}
.page-about .about-intro__card ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-intro__card li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 9px 0;
  border-bottom: 1px dashed var(--color-light);
  font-size: 14px;
  line-height: 1.5;
}
.page-about .about-intro__card li:last-child {
  border-bottom: none;
}
.page-about .about-intro__card li span {
  color: var(--color-dark);
  opacity: 0.6;
  flex-shrink: 0;
}

/* ---------- 02 发展历程 ---------- */
.page-about .about-timeline {
  background: var(--color-white);
  border-radius: 32px;
  box-shadow: var(--shadow-sm);
  margin: 24px 16px;
  padding: var(--about-pad-y) 0;
}
.page-about .about-timeline__intro {
  max-width: 640px;
  margin: 20px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: #4A5568;
}
.page-about .about-timeline__list {
  position: relative;
  margin-top: 48px;
}
.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 103px;
  top: 0;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-blue) 0%, var(--color-orange) 100%);
  opacity: 0.3;
  border-radius: var(--radius-pill);
}
.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 80px 24px 1fr;
  gap: 12px;
  align-items: start;
  padding-bottom: 36px;
}
.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}
.page-about .about-timeline__year {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(24px, 5vw, 40px);
  line-height: 1.2;
  text-align: right;
  color: var(--color-blue);
  letter-spacing: -0.02em;
}
.page-about .about-timeline__dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-white);
  border: 4px solid var(--color-orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.18);
  justify-self: center;
  margin-top: 10px;
  z-index: 1;
}
.page-about .about-timeline__body {
  background: var(--color-light);
  border-radius: var(--radius-md);
  padding: 18px 20px;
}
.page-about .about-timeline__body h3 {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 900;
  margin-bottom: 6px;
}
.page-about .about-timeline__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
  color: #4A5568;
}

/* ---------- 03 核心数据 ---------- */
.page-about .about-metrics {
  position: relative;
  overflow: hidden;
  background: linear-gradient(145deg, var(--color-navy) 0%, #10212F 60%, #0D1B28 100%);
  color: var(--color-white);
  padding: var(--about-pad-y) 0;
}
.page-about .about-metrics::after {
  content: "DATA";
  position: absolute;
  left: -14px;
  top: 30px;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(80px, 16vw, 140px);
  line-height: 1;
  color: rgba(255, 255, 255, 0.03);
  letter-spacing: 0.1em;
  pointer-events: none;
  user-select: none;
}
.page-about .about-metrics .chapter__num {
  color: var(--color-orange);
}
.page-about .about-metrics .chapter__title {
  color: var(--color-white);
}
.page-about .about-metrics .chapter__annot {
  color: rgba(255, 255, 255, 0.6);
}
.page-about .about-metrics__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 44px;
}
.page-about .about-metric {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: 26px 16px;
  text-align: center;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}
.page-about .about-metric:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--color-orange);
}
.page-about .about-metric__num {
  display: block;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(34px, 8vw, 64px);
  line-height: 1.1;
  color: var(--color-orange);
}
.page-about .about-metric:nth-child(even) .about-metric__num {
  color: var(--color-blue);
}
.page-about .about-metric__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.75);
}
.page-about .about-metrics__foot {
  display: grid;
  gap: 12px;
  margin-top: 28px;
  position: relative;
  z-index: 1;
}
.page-about .about-metrics__item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.8);
}
.page-about .about-metrics__item strong {
  font-family: var(--font-heading);
  font-weight: 900;
  color: var(--color-orange-light);
  white-space: nowrap;
}
.page-about .about-metrics__media {
  position: relative;
  z-index: 1;
  margin-top: 28px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.page-about .about-metrics__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

/* ---------- 04 资质认证与荣誉 ---------- */
.page-about .about-cert {
  background: var(--color-white);
  border-radius: 32px;
  box-shadow: var(--shadow-sm);
  margin: 24px 16px;
  padding: var(--about-pad-y) 0;
}
.page-about .about-cert__grid {
  display: grid;
  gap: 20px;
  margin-top: 40px;
}
.page-about .about-cert__card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  background: var(--color-white);
  border-bottom: 4px solid transparent;
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}
.page-about .about-cert__card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-bottom-color: var(--color-blue);
}
.page-about .about-cert__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 18px;
  background: linear-gradient(135deg, var(--color-orange), #FF8E5E);
  box-shadow: 0 8px 20px rgba(255, 107, 53, 0.3);
}
.page-about .about-cert__card:nth-child(2) .about-cert__icon {
  background: linear-gradient(135deg, var(--color-blue), #4DC9F6);
  box-shadow: 0 8px 20px rgba(0, 168, 232, 0.3);
}
.page-about .about-cert__card:nth-child(3) .about-cert__icon {
  background: linear-gradient(135deg, var(--color-navy), #2E436A);
  box-shadow: 0 8px 20px rgba(30, 41, 59, 0.3);
}
.page-about .about-cert__icon svg {
  display: block;
}
.page-about .about-cert__card h3 {
  font-family: var(--font-heading);
  font-size: 19px;
  font-weight: 900;
  line-height: 1.4;
}
.page-about .about-cert__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: #4A5568;
}

/* ---------- 05 合作伙伴 ---------- */
.page-about .about-partners {
  background: var(--color-white);
  border-radius: 32px;
  box-shadow: var(--shadow-sm);
  margin: 24px 16px;
  padding: var(--about-pad-y) 0;
}
.page-about .about-partners__desc {
  max-width: 640px;
  margin: 20px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: #4A5568;
}
.page-about .tag-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}
.page-about .tag-filter__btn {
  border: 1px solid #D9E2EC;
  background: var(--color-white);
  color: var(--color-dark);
  border-radius: var(--radius-pill);
  padding: 8px 18px;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.page-about .tag-filter__btn:hover,
.page-about .tag-filter__btn[data-active="true"] {
  background: var(--color-blue);
  border-color: var(--color-blue);
  color: var(--color-white);
}
.page-about .about-partners__grid {
  display: grid;
  gap: 20px;
  margin-top: 28px;
}
.page-about .about-partner {
  background: var(--color-light);
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: background-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}
.page-about .about-partner:hover {
  background: var(--color-white);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-blue);
}
.page-about .about-partner__icon {
  display: block;
  margin-bottom: 14px;
}
.page-about .about-partner__icon svg {
  display: block;
}
.page-about .about-partner h3 {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 900;
  margin-bottom: 8px;
}
.page-about .about-partner p {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: #4A5568;
}
.page-about .about-partners__media {
  margin-top: 28px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.page-about .about-partners__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

/* ---------- 底部引导 ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-navy) 0%, #1B2A4A 100%);
  color: var(--color-white);
  padding: var(--about-pad-y) 0;
  border-radius: 36px 36px 0 0;
}
.page-about .about-cta__inner {
  position: relative;
  z-index: 1;
  text-align: center;
}
.page-about .about-cta h2 {
  font-family: var(--font-heading);
  font-size: clamp(22px, 4vw, 32px);
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: 12px;
}
.page-about .about-cta p {
  color: rgba(255, 255, 255, 0.75);
  font-size: 16px;
  line-height: 1.8;
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin: 24px 0 16px;
}
.page-about .about-cta__actions .btn {
  margin: 0;
}
.page-about .about-cta__contact {
  margin: 0;
  font-size: 15px;
}
.page-about .about-cta__watermark {
  position: absolute;
  right: -16px;
  bottom: -24px;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(64px, 14vw, 128px);
  line-height: 1;
  letter-spacing: 0.1em;
  color: rgba(255, 255, 255, 0.04);
  pointer-events: none;
  user-select: none;
}

/* ---------- 桌面端增强 ---------- */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 64px) 0 96px;
  }
  .page-about .about-hero__grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 56px;
  }

  .page-about .about-intro__grid {
    grid-template-columns: 1.25fr 0.75fr;
    gap: 48px;
  }
  .page-about .about-timeline,
  .page-about .about-cert,
  .page-about .about-partners {
    margin: 40px 32px;
  }
  .page-about .about-timeline__list {
    margin-top: 56px;
  }
  .page-about .about-timeline__item {
    grid-template-columns: 120px 32px 1fr;
    gap: 16px;
    padding-bottom: 44px;
  }
  .page-about .about-timeline__list::before {
    left: 151px;
  }
  .page-about .about-timeline__year {
    font-size: clamp(28px, 4vw, 44px);
  }
  .page-about .about-timeline__dot {
    width: 16px;
    height: 16px;
    margin-top: 12px;
  }

  .page-about .about-metrics__grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 56px;
  }
  .page-about .about-metric {
    padding: 36px 20px;
  }
  .page-about .about-metrics__foot {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-top: 24px;
  }
  .page-about .about-metrics__media,
  .page-about .about-partners__media {
    margin-top: 36px;
  }
  .page-about .about-cert__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 56px;
  }
  .page-about .about-cert__card {
    padding: 32px 28px;
  }
  .page-about .about-partners__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 32px;
  }
  .page-about .about-cta__actions .btn {
    min-width: 180px;
  }
}