/* 长江海巡船智能航行案例 — scoped under .case-ar
   相对原稿尺寸放大 120%，适配 100% 系统缩放下的观感 */
.case-ar {
  --ink: #112029;
  --muted: #5d7179;
  --brand: #1b7696;
  --brand-deep: #0d4d66;
  --ice: #edf4f6;
  --mist: #f8fbfb;
  --line: #d9e5e8;
  --navy: #071f2d;
  --white: #fff;
  --container: 1416px;
  --space: clamp(98.4px, 12vw, 172.8px);
  color: var(--ink);
  background: var(--white);
  font-family: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.case-ar *,
.case-ar *::before,
.case-ar *::after {
  box-sizing: border-box;
}

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

.case-ar a {
  color: inherit;
  text-decoration: none;
}

body.page-case-ar {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body.page-case-ar .hadheight {
  display: block;
  height: 0;
}

.case-ar .container {
  width: min(calc(100% - 57.6px), var(--container));
  margin-inline: auto;
}

.case-ar .case-section {
  position: relative;
  padding: var(--space) 0;
  overflow: hidden;
}

.case-ar .section-index {
  position: absolute;
  top: clamp(40.8px, 6vw, 84px);
  left: max(28.8px, calc((100vw - var(--container)) / 2 - 33.6px));
  color: #e5edef;
  font-size: clamp(108px, 14.4vw, 199.2px);
  line-height: 0.8;
  font-weight: 700;
  letter-spacing: -0.09em;
  pointer-events: none;
  user-select: none;
}

.case-ar .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 16.8px;
  margin-bottom: 26.4px;
  color: var(--brand);
  font-size: 14.4px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.case-ar .eyebrow::before {
  content: "";
  width: 45.6px;
  height: 1.2px;
  background: currentColor;
}

.case-ar h1,
.case-ar h2,
.case-ar h3,
.case-ar p {
  margin-top: 0;
}

.case-ar .project-intro {
  min-height: 100vh;
  display: grid;
  align-items: center;
  background: var(--ice);
}

.case-ar .intro-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(52.8px, 8.4vw, 105.6px);
  align-items: center;
}

.case-ar .vessel-photo {
  margin: 0;
  padding: 0;
  background: var(--navy);
  box-shadow: 0 26.4px 64.8px rgba(10, 47, 61, 0.16);
}

.case-ar .vessel-photo img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.case-ar .vessel-photo figcaption {
  display: flex;
  justify-content: space-between;
  gap: 14.4px;
  padding: 18px 21.6px 20.4px;
  color: rgba(255, 255, 255, 0.52);
  font-size: 12px;
  letter-spacing: 0.12em;
}

.case-ar .intro-copy h1 {
  margin-bottom: 31.2px;
  font-size: clamp(40.8px, 4.9vw, 66px);
  line-height: 1.28;
  letter-spacing: -0.045em;
  font-weight: 650;
}

.case-ar .intro-copy p {
  margin-bottom: 33.6px;
  color: var(--muted);
  font-size: 20.4px;
  line-height: 2;
}

.case-ar .tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10.8px;
}

.case-ar .tags span {
  padding: 10.8px 15.6px;
  color: var(--brand-deep);
  border: 1.2px solid #cbdde1;
  background: rgba(255, 255, 255, 0.6);
  font-size: 14.4px;
}

.case-ar .section-heading {
  max-width: 912px;
  margin-bottom: 69.6px;
}

.case-ar .section-heading h2 {
  margin-bottom: 24px;
  font-size: clamp(38.4px, 4.8vw, 63.6px);
  line-height: 1.3;
  letter-spacing: -0.04em;
  font-weight: 650;
}

.case-ar .section-heading p {
  margin: 0;
  color: var(--muted);
  font-size: 20.4px;
  line-height: 1.9;
}

.case-ar .project-story {
  display: grid;
  grid-template-columns: 0.72fr 1.28fr;
  gap: clamp(45.6px, 9.6vw, 132px);
  align-items: start;
}

.case-ar .story-label {
  display: flex;
  align-items: center;
  gap: 18px;
  color: var(--brand-deep);
  font-size: 14.4px;
  font-weight: 700;
  letter-spacing: 0.14em;
}

.case-ar .story-label::after {
  content: "";
  width: 74.4px;
  height: 1.2px;
  background: #99bbc4;
}

.case-ar .story-copy {
  margin: 0;
  font-size: clamp(25.2px, 2.6vw, 36px);
  line-height: 1.8;
  letter-spacing: -0.02em;
}

.case-ar .story-copy strong {
  color: var(--brand-deep);
  font-weight: 650;
}

.case-ar .installation {
  background: var(--mist);
}

.case-ar .photo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 19.2px;
}

.case-ar .photo-card {
  margin: 0;
  background: var(--white);
}

.case-ar .photo-card img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
}

.case-ar .photo-card figcaption {
  padding: 21.6px 24px 25.2px;
}

.case-ar .photo-card strong {
  display: block;
  margin-bottom: 9.6px;
  font-size: 20.4px;
  font-weight: 650;
}

.case-ar .photo-card span {
  color: var(--muted);
  font-size: 15.6px;
  line-height: 1.7;
}

.case-ar .installation-note {
  max-width: 912px;
  margin: 40.8px 0 0;
  color: var(--muted);
  font-size: 19.2px;
  line-height: 1.9;
}

.case-ar .implementation-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(48px, 8.4vw, 112.8px);
  align-items: center;
}

.case-ar .ar-screen {
  margin: 0;
  padding: 12px;
  background: var(--navy);
  box-shadow: 0 31.2px 69.6px rgba(11, 53, 67, 0.14);
}

.case-ar .ar-screen img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.case-ar .ar-screen figcaption {
  padding: 16.8px 8.4px 4.8px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: rgba(255, 255, 255, 0.5);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.case-ar .implementation-copy h2 {
  margin-bottom: 21.6px;
  font-size: clamp(36px, 4.2vw, 55.2px);
  line-height: 1.35;
  letter-spacing: -0.04em;
  font-weight: 650;
}

.case-ar .implementation-copy > p {
  margin-bottom: 33.6px;
  color: var(--muted);
  font-size: 20.4px;
  line-height: 1.9;
}

.case-ar .check-list {
  display: grid;
  gap: 19.2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.case-ar .check-list li {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 15.6px;
  align-items: start;
  padding-top: 18px;
  border-top: 1.2px solid var(--line);
}

.case-ar .check-list b {
  color: var(--brand);
  font-size: 16.8px;
}

.case-ar .check-list span {
  color: #2e444e;
  font-size: 18px;
  line-height: 1.7;
}

.case-ar .steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16.8px;
  margin-top: 81.6px;
}

.case-ar .step {
  min-height: 252px;
  padding: 33.6px;
  border-top: 2.4px solid var(--brand);
  background: var(--ice);
}

.case-ar .step small {
  color: var(--brand);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
}

.case-ar .step h3 {
  margin: 40.8px 0 14.4px;
  font-size: 22.8px;
  font-weight: 650;
}

.case-ar .step p {
  margin: 0;
  color: var(--muted);
  font-size: 16.8px;
  line-height: 1.8;
}

.case-ar .value-section {
  background: var(--ice);
}

.case-ar .value-layout {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: clamp(52.8px, 9.6vw, 132px);
  align-items: start;
}

.case-ar .value-layout h2 {
  margin: 0;
  font-size: clamp(38.4px, 4.8vw, 63.6px);
  line-height: 1.3;
  letter-spacing: -0.04em;
  font-weight: 650;
}

.case-ar .value-list {
  display: grid;
  gap: 21.6px;
}

.case-ar .value-item {
  display: grid;
  grid-template-columns: 45.6px 1fr;
  gap: 20.4px;
  align-items: start;
}

.case-ar .value-item b {
  color: var(--brand);
  font-size: 30px;
  font-weight: 650;
}

.case-ar .value-item p {
  margin: 0;
  color: var(--muted);
  font-size: 19.2px;
  line-height: 1.85;
}

.case-ar .project-facts {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 86.4px;
  border-top: 1.2px solid var(--line);
  border-left: 1.2px solid var(--line);
}

.case-ar .fact {
  padding: 30px;
  border-right: 1.2px solid var(--line);
  border-bottom: 1.2px solid var(--line);
  background: #fff;
}

.case-ar .fact small {
  display: block;
  margin-bottom: 10.8px;
  color: #78909a;
  font-size: 12px;
  letter-spacing: 0.12em;
}

.case-ar .fact strong {
  color: var(--brand-deep);
  font-size: 24px;
  font-weight: 650;
}

.case-ar .reveal {
  opacity: 0;
  transform: translateY(26.4px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

.case-ar .reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .case-ar .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

@media (max-width: 984px) {
  .case-ar .container {
    width: min(calc(100% - 43.2px), var(--container));
  }

  .case-ar .project-intro {
    min-height: auto;
  }

  .case-ar .intro-layout,
  .case-ar .project-story,
  .case-ar .implementation-layout,
  .case-ar .value-layout {
    grid-template-columns: 1fr;
    gap: 50.4px;
  }

  .case-ar .photo-grid,
  .case-ar .steps {
    grid-template-columns: 1fr;
  }

  .case-ar .photo-card img {
    aspect-ratio: 16 / 10;
  }

  .case-ar .project-facts {
    grid-template-columns: repeat(2, 1fr);
    margin-top: 62.4px;
  }
}

@media (max-width: 624px) {
  .case-ar {
    --space: 88.8px;
  }

  .case-ar .container {
    width: min(calc(100% - 33.6px), var(--container));
  }

  .case-ar .section-index {
    left: 16.8px;
    font-size: 98.4px;
  }

  .case-ar .intro-copy h1 {
    font-size: 40.8px;
  }

  .case-ar .intro-copy p,
  .case-ar .section-heading p {
    font-size: 18px;
  }

  .case-ar .vessel-photo img {
    aspect-ratio: 4 / 3;
  }

  .case-ar .vessel-photo figcaption,
  .case-ar .ar-screen figcaption {
    flex-direction: column;
    gap: 7.2px;
  }

  .case-ar .story-copy {
    font-size: 25.2px;
  }

  .case-ar .project-facts {
    grid-template-columns: 1fr;
  }
}