/* Shared case-page layout for standalone and website public routes. */
.ai-case-body { background: #fff; }
.ai-case-header { background: #071a30; color: #fff; }
.ai-case-header-inner { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.ai-case-header img { width: 176px; }
.ai-case-back { font-size: 13px; color: #c2d5e6; }
.ai-case-back:hover { color: #fff; }
.ai-case-hero { position: relative; isolation: isolate; display: flex; align-items: center; min-height: 310px; padding: 64px 0; color: #fff; background: #0a2444; overflow: hidden; }
.ai-case-hero::before { content: ""; position: absolute; z-index: -1; inset: 0; background-image: linear-gradient(90deg, #04152eeb, #04152e99 55%, #04152e40), var(--case-hero); background-size: cover; background-position: center, center 48%; }
.ai-case-kicker { font-size: 11px; color: #4c88b4; letter-spacing: .16em; margin-bottom: 14px; }
.ai-case-hero .ai-case-kicker { color: #9ac5e7; }
.ai-case-hero h1 { margin: 0; font-size: clamp(30px, 3.2vw, 44px); font-weight: 650; line-height: 1.4; }
.ai-case-hero p { margin: 14px 0 0; color: #c9deed; font-size: 14px; letter-spacing: .08em; }
.ai-case-nav-wrap { border-bottom: 1px solid #e3edf5; background: #f6faff; }
.ai-case-nav { display: grid; grid-template-columns: repeat(9, minmax(0, 1fr)); gap: 8px; }
.ai-case-nav a { display: flex; align-items: center; justify-content: center; min-height: 68px; padding: 12px 4px; border-bottom: 2px solid transparent; font-size: 14px; color: #607991; }
.ai-case-nav a:hover, .ai-case-nav a[aria-current="page"] { color: #126fcf; border-bottom-color: #1677ed; }
.ai-case-overview { padding-top: 66px; padding-bottom: 66px; }
.ai-case-overview h2, .ai-case-section-heading h2 { margin: 0; font-size: 28px; font-weight: 600; line-height: 1.4; }
.ai-case-overview p { max-width: 1000px; margin: 24px 0 0; font-size: 15px; line-height: 2.05; color: #5b7288; }
.ai-case-projects { padding: 60px 0; background: #edf6fd; }
.ai-case-section-heading { display: flex; align-items: center; justify-content: space-between; gap: 24px; margin-bottom: 28px; }
.ai-case-return { padding-top: 32px; padding-bottom: 32px; color: #286fa8; font-size: 14px; }
.ai-case-footer { padding: 24px 0; font-size: 12px; color: #a3b7ca; background: #071a30; }
@media (max-width: 980px) {
  .ai-case-nav { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0 8px; }
  .ai-case-nav a { min-height: 54px; }
}
@media (max-width: 720px) {
  .ai-case-header-inner { min-height: 72px; gap: 16px; }
  .ai-case-header img { width: 146px; }
  .ai-case-back { font-size: 12px; }
  .ai-case-hero { min-height: 250px; padding: 48px 0; }
  .ai-case-hero p { font-size: 12px; }
  .ai-case-nav a { font-size: 12px; min-height: 48px; }
  .ai-case-overview { padding-top: 42px; padding-bottom: 42px; }
  .ai-case-overview h2, .ai-case-section-heading h2 { font-size: 23px; }
  .ai-case-overview p { font-size: 14px; margin-top: 20px; }
  .ai-case-projects { padding: 42px 0; }
  .ai-case-section-heading { gap: 12px; }
}

/* ============ 项目案例卡片（AIOT-CASES 区块） ============ */
.ai-case-grid { display: grid; align-items: stretch; grid-auto-rows: 1fr; gap: 26px; }
.ai-case-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.ai-case-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.ai-case-card { display: flex; flex-direction: column; border: 1px solid #dce6ed; border-radius: 6px; overflow: hidden; background: #fff; transition: border-color .3s ease, box-shadow .3s ease; }
.ai-case-card:hover { border-color: #b9d5ec; box-shadow: 0 10px 26px #12395f14; }
.ai-case-card-media { position: relative; aspect-ratio: 16 / 10; overflow: hidden; background: #e6f0f8; }
.ai-case-card-media img { display: block; width: 100%; height: 100%; object-fit: cover; transition: transform .6s ease; }
.ai-case-card:hover .ai-case-card-media img { transform: scale(1.035); }
.ai-case-card-body { display: flex; flex-direction: column; gap: 8px; flex: 1; padding: 20px 22px 24px; }
.ai-case-card-name { margin: 0; font-size: 16px; font-weight: 600; line-height: 1.5; color: #12395f; }
.ai-case-card-en { margin: 0; font-size: 11.5px; line-height: 1.55; letter-spacing: .04em; color: #8098ab; }
.ai-case-card-desc { margin: 4px 0 0; flex: 1; font-size: 13px; line-height: 1.95; color: #5b7288; }

/* 交通智能：左图右文 */
.ai-case-feature { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr); border: 1px solid #dce6ed; border-radius: 6px; overflow: hidden; background: #fff; }
.ai-case-feature-media { position: relative; min-height: 300px; background: #e6f0f8; }
.ai-case-feature-media img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.ai-case-feature-body { display: flex; flex-direction: column; justify-content: center; gap: 10px; padding: 36px 38px; }
.ai-case-feature-body .ai-case-card-name { font-size: 19px; }
.ai-case-feature-body .ai-case-card-desc { flex: 0 0 auto; margin-top: 6px; }

@media (max-width: 1100px) {
  .ai-case-grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 860px) {
  .ai-case-grid, .ai-case-grid--2, .ai-case-grid--3 { grid-template-columns: 1fr; gap: 20px; }
  .ai-case-card-body { padding: 18px 18px 20px; }
  .ai-case-feature { grid-template-columns: 1fr; }
  .ai-case-feature-media { position: relative; min-height: 0; aspect-ratio: 16 / 10; }
  .ai-case-feature-body { padding: 24px 20px 28px; }
  .ai-case-feature-body .ai-case-card-name { font-size: 17px; }
}