:root {
  --nav-offset: clamp(7.5rem, 10vw, 8.75rem);
  --section-space: clamp(4.5rem, 9vw, 8rem);
}

html {
  scroll-behavior: smooth;
}

body {
  overflow-x: hidden;
}

img {
  display: block;
  max-width: 100%;
}

.bp-page {
  padding-top: var(--nav-offset);
}

/* 固定顶栏占位在 main 上，但首屏区块背景需贴顶：用负边距拉回，并在首块内补齐顶栏高度 */
.bp-page > :first-child {
  margin-top: calc(-1 * var(--nav-offset));
}

.bp-page > .bp-section:first-child {
  padding-top: calc(var(--nav-offset) + var(--section-space));
  padding-bottom: var(--section-space);
}

.bp-page > section:not(.bp-section):first-child {
  padding-top: calc(var(--nav-offset) + clamp(3.5rem, 5vw, 5rem));
  padding-bottom: clamp(3.5rem, 8vw, 5rem);
}

.bp-wrap {
  width: min(calc(100% - var(--shell-gutter, 2rem)), var(--shell-max, 92rem));
  margin: 0 auto;
}

.bp-section {
  padding-block: var(--section-space);
}

.bp-grid {
  background-image:
    linear-gradient(to right, rgba(0, 51, 99, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0, 51, 99, 0.06) 1px, transparent 1px);
  background-size: 40px 40px;
}

/* 首屏氛围：柔和渐变 + 低对比大网格，避免「工程纸」过硬 */
.bp-hero-backdrop {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 100% 70% at 12% 0%, rgba(16, 74, 133, 0.09), transparent 52%),
    radial-gradient(ellipse 80% 55% at 88% 15%, rgba(0, 51, 99, 0.06), transparent 48%),
    linear-gradient(180deg, #eef1f5 0%, #f6f7f9 38%, #f3f3f5 100%);
}

.bp-hero-backdrop::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.4;
  background-image:
    linear-gradient(to right, rgba(0, 51, 99, 0.035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0, 51, 99, 0.035) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, #000 65%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 0%, #000 65%, transparent 100%);
}

.bp-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  color: #104a85;
  font-family: "Space Grotesk", "Inter", sans-serif;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
}

.bp-kicker::before {
  content: "";
  width: 2.8rem;
  height: 1px;
  background: rgba(16, 74, 133, 0.35);
}

.bp-title {
  font-family: "Space Grotesk", "Inter", sans-serif;
  font-size: clamp(3rem, 8vw, 5.75rem);
  font-weight: 700;
  letter-spacing: -0.07em;
  line-height: 0.92;
}

.bp-section-title {
  font-family: "Space Grotesk", "Inter", sans-serif;
  font-size: clamp(2rem, 3vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.05em;
  line-height: 1;
}

.bp-subtitle {
  font-family: "Space Grotesk", "Inter", sans-serif;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.bp-lead {
  max-width: 40rem;
  color: #424750;
  font-size: clamp(1rem, 1.2vw, 1.15rem);
  line-height: 1.8;
}

.bp-panel {
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(194, 198, 209, 0.35);
}

.bp-image-frame {
  position: relative;
  overflow: hidden;
  background: #e8e8ea;
}

.bp-image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.bp-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 2rem;
  padding: 0.35rem 0.85rem;
  background: rgba(16, 74, 133, 0.08);
  color: #104a85;
  font-family: "Space Grotesk", "Inter", sans-serif;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.bp-divider {
  width: 5rem;
  height: 2px;
  background: #104a85;
}

.bp-metric-rail {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(194, 198, 209, 0.35);
}

.bp-metric-rail dt {
  margin-bottom: 0.35rem;
  color: #737781;
  font-family: "Space Grotesk", "Inter", sans-serif;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.bp-metric-rail dd {
  margin: 0;
  color: #003363;
  font-family: "Space Grotesk", "Inter", sans-serif;
  font-size: clamp(1.3rem, 2vw, 1.85rem);
  font-weight: 700;
  letter-spacing: -0.04em;
}

.bp-product-wall {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  border-top: 1px solid rgba(194, 198, 209, 0.35);
  border-left: 1px solid rgba(194, 198, 209, 0.35);
}

.bp-product-card {
  display: flex;
  flex-direction: column;
  min-height: 24rem;
  padding: 1.5rem;
  border-right: 1px solid rgba(194, 198, 209, 0.35);
  border-bottom: 1px solid rgba(194, 198, 209, 0.35);
  transition: background-color 180ms ease;
}

.bp-product-card:hover {
  background: #f3f3f5;
}

.bp-product-card__icon {
  width: 3.4rem;
  height: 3.4rem;
  margin-bottom: 2rem;
  overflow: hidden;
  background: #e8e8ea;
}

.bp-product-card__icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.bp-product-card__title {
  font-family: "Space Grotesk", "Inter", sans-serif;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.04em;
}

.bp-product-card__meta {
  margin-top: 0.5rem;
  color: #4f5f78;
  font-size: 0.86rem;
  line-height: 1.7;
}

.bp-shot-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem;
  margin-top: auto;
  padding-top: 1.5rem;
}

.bp-shot {
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 9 / 19;
  padding: 0.35rem;
  background: #ffffff;
  border: 1px solid rgba(194, 198, 209, 0.26);
}

.bp-shot img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.bp-shot-strip {
  display: flex;
  gap: 0.5rem;
  margin-top: auto;
  padding-top: 1.5rem;
  overflow-x: auto;
  scrollbar-width: none;
}

.bp-shot-strip::-webkit-scrollbar {
  display: none;
}

.bp-shot-strip .bp-shot {
  min-width: 4.4rem;
  flex: 0 0 4.4rem;
}

.bp-solution {
  display: grid;
  grid-template-columns: minmax(18rem, 0.85fr) minmax(0, 1.35fr);
  gap: clamp(1.5rem, 3vw, 3.5rem);
  align-items: start;
}

/* 截图条在 DOM 第一列（大屏上视觉在左侧）时，与「文案左 / 图右」对调列宽，避免窄列挤不下多张截图 */
.bp-solution--strip-first {
  grid-template-columns: minmax(0, 1.4fr) minmax(18rem, 0.8fr);
}

.bp-solution__aside {
  position: sticky;
  top: calc(var(--nav-offset) + 1rem);
}

.bp-solution__gallery {
  display: grid;
  gap: 1rem;
}

.bp-solution__gallery--quad {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.bp-solution__gallery--mixed {
  grid-template-columns: repeat(12, minmax(0, 1fr));
}

.bp-gallery-tile {
  overflow: hidden;
  background: #e8e8ea;
  border: 1px solid rgba(194, 198, 209, 0.35);
}

.bp-gallery-tile img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.bp-solution__strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  min-width: 0;
}

.bp-solution__strip .bp-gallery-tile {
  min-width: 0;
  width: 100%;
  aspect-ratio: 9 / 19;
}

.bp-solution__strip .bp-gallery-tile img {
  object-fit: contain;
  background: #fff;
}

.bp-gallery-tile--wide {
  grid-column: span 12;
  aspect-ratio: 21 / 8;
}

.bp-gallery-tile--square {
  grid-column: span 4;
  aspect-ratio: 1 / 1;
}

.bp-gallery-tile--half {
  grid-column: span 6;
  aspect-ratio: 4 / 3;
}

.bp-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.bp-stats-grid > div {
  padding: clamp(1.6rem, 3vw, 3rem);
  border: 1px solid rgba(194, 198, 209, 0.35);
}

.bp-stats-grid strong {
  display: block;
  margin-bottom: 0.35rem;
  color: #1a1c1d;
  font-family: "Space Grotesk", "Inter", sans-serif;
  font-size: clamp(2.4rem, 4vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.07em;
}

.bp-studio-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1px;
  background: rgba(194, 198, 209, 0.35);
}

.bp-studio-tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  min-height: 12rem;
  padding: 1.5rem;
  background: #ffffff;
  text-align: center;
}

.bp-studio-icon {
  width: 4rem;
  height: 4rem;
  padding: 1rem;
  background: #e8e8ea;
}

.bp-link {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: #003363;
  font-family: "Space Grotesk", "Inter", sans-serif;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.bp-link:hover {
  color: #104a85;
}

@media (max-width: 1023px) {
  .bp-product-wall {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .bp-solution {
    grid-template-columns: 1fr;
  }

  .bp-solution__aside {
    position: static;
  }

  .bp-studio-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 767px) {
  :root {
    --nav-offset: 9.25rem;
  }

  .bp-title {
    font-size: clamp(2.5rem, 13vw, 3.8rem);
    line-height: 0.95;
  }

  .bp-section-title {
    font-size: clamp(1.9rem, 8vw, 2.4rem);
  }

  .bp-kicker {
    letter-spacing: 0.16em;
  }

  .bp-kicker::before {
    width: 2rem;
  }

  .bp-product-wall,
  .bp-stats-grid,
  .bp-studio-grid,
  .bp-metric-rail {
    grid-template-columns: 1fr;
  }

  .bp-product-card {
    min-height: auto;
  }

  .bp-shot {
    aspect-ratio: 10 / 18;
  }

  .bp-shot-strip .bp-shot {
    min-width: 4rem;
    flex-basis: 4rem;
  }

  .bp-solution__strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.65rem;
  }

  .bp-gallery-tile--half,
  .bp-gallery-tile--square,
  .bp-gallery-tile--wide {
    grid-column: span 12;
  }
}