/* 已确认的横向业务分层：仅使用独立命名，继承首页内容边界与底色。 */
.business-intro {
  padding-block: 34px 42px;
  color: #10141b;
  font-family: Arial, "PingFang SC", "HarmonyOS Sans SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  scroll-margin-top: 118px;
}
.business-intro h2, .business-intro h3, .business-intro h4, .business-intro p { margin: 0; }
.business-intro-heading { margin-bottom: 22px; }
.business-intro-title-row { display: flex; align-items: flex-end; gap: 24px; }
.business-intro-title-row h2 { flex: none; font-size: clamp(43px, calc(3.8 * var(--layout-unit)), 58px); font-weight: 620; line-height: 1.04; letter-spacing: -.055em; }
.business-intro-title-row > p { flex: 1; min-width: 0; color: #505761; font-size: 22px; line-height: 1.45; text-align: right; }
.business-intro-groups { display: grid; gap: 18px; }
.business-intro-group { display: grid; grid-template-columns: 232px minmax(0, 1fr); gap: 10px; min-width: 0; }
.business-intro-label { position: relative; display: flex; flex-direction: column; align-items: flex-start; justify-content: space-between; gap: 12px; min-height: 0; padding: 18px 20px 22px; overflow: hidden; color: #fff; background-color: #252a30; background-size: cover; background-position: center; }
/* 原样采用确认的局部立方体和拆解半球；静态 SVG 不增加动画或渲染负担。 */
.business-intro-creation .business-intro-label { background-image: url("assets/business/creation-geometry.svg"); }
.business-intro-application .business-intro-label { background-image: url("assets/business/application-geometry.svg"); }
.business-intro-label > span { position: relative; color: rgba(255,255,255,.28); font-size: 76px; font-weight: 600; line-height: .92; letter-spacing: -.1em; }
.business-intro-label h3 { position: relative; font-size: 32px; font-weight: 650; line-height: 1.15; letter-spacing: -.035em; }
.business-intro-cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; min-width: 0; }
.business-intro-card { position: relative; overflow: hidden; min-width: 0; aspect-ratio: 2.16 / 1; max-height: 280px; color: #fff; isolation: isolate; }
/* 图像只做等比裁切，不拉伸；遮罩仅保证叠加文字可读，不增加图片外部底块。 */
.business-intro-card img { position: absolute; inset: 0; z-index: -2; width: 100%; height: 100%; object-fit: cover; }
.business-intro-card::before { content: ""; position: absolute; inset: 0; z-index: -1; background: linear-gradient(90deg,rgba(6,9,14,.88),rgba(6,9,14,.54) 31%,rgba(6,9,14,.04) 72%); }
.business-intro-copy { position: absolute; left: 16px; bottom: 14px; max-width: calc(100% - 32px); }
.business-intro-copy h4 { font-size: 23px; font-weight: 620; line-height: 1.15; }
.business-intro-copy p { margin-top: 8px; color: rgba(255,255,255,.88); font-size: 16px; line-height: 1.4; }

@media (min-width: 1400px) { .business-intro-title-row > p { white-space: nowrap; } }
/* 较矮 PC 仍保持整块一屏内；只收敛卡片高度和区块留白。 */
@media (min-width: 901px) and (max-height: 860px) {
  .business-intro { padding-block: 24px 28px; }
  .business-intro-card { max-height: 244px; }
}
@media (max-width: 680px) {
  .business-intro { padding-block: 28px 32px; }
  .business-intro-title-row { display: block; }
  .business-intro-title-row h2 { font-size: 38px; }
  .business-intro-title-row h2 br { display: none; }
  .business-intro-title-row > p { margin-top: 12px; font-size: 18px; text-align: left; }
  .business-intro-group { grid-template-columns: 1fr; }
  .business-intro-label { min-height: 118px; flex-direction: row; align-items: flex-end; background-size: 320px 320px; background-repeat: no-repeat; background-position: right center; }
  .business-intro-label > span { font-size: 52px; }
  .business-intro-label h3 { font-size: 28px; }
  .business-intro-card { aspect-ratio: 1.85 / 1; max-height: none; }
}
@media (max-width: 680px) {
  .business-intro-title-row h2 br { display: initial; }
  .business-intro-cards { grid-template-columns: 1fr; }
  .business-intro-copy { left: 16px; bottom: 18px; }
}