/* ============================================================
   四足巡检案例页面 — 滑动式未来科技风格
   ============================================================ */

:root {
  --bg-0: #05070f;
  --bg-1: #0a0e1a;
  --bg-2: #0f1424;
  --surface: rgba(15, 20, 40, 0.6);
  --border: rgba(0, 240, 255, 0.15);
  --border-strong: rgba(0, 240, 255, 0.35);
  --cyan: #00f0ff;
  --blue: #0066ff;
  --purple: #7c3aed;
  --magenta: #d946ef;
  --text-1: #e8f4ff;
  --text-2: #9fb3cc;
  --text-3: #5d6e85;
  --glow-cyan: 0 0 20px rgba(0, 240, 255, 0.5), 0 0 40px rgba(0, 240, 255, 0.2);
  --transition: 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  background: var(--bg-0);
  color: var(--text-1);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* 背景 */
#bg-canvas {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  z-index: -2;
  background: radial-gradient(ellipse at 20% 10%, #0c1430 0%, #05070f 55%);
}
.bg-grid {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: -1;
  background-image: linear-gradient(rgba(0, 240, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 240, 255, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
  pointer-events: none;
}
.bg-glow {
  position: fixed; border-radius: 50%; filter: blur(120px); opacity: 0.3;
  z-index: -1; pointer-events: none; animation: float 18s ease-in-out infinite;
}
.bg-glow.g1 { width: 500px; height: 500px; background: var(--blue); top: -100px; left: -100px; }
.bg-glow.g2 { width: 600px; height: 600px; background: var(--purple); top: 40%; right: -150px; animation-delay: -6s; }
@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(40px, -30px) scale(1.05); }
  66% { transform: translate(-30px, 40px) scale(0.95); }
}

/* 返回栏 */
.case-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 14px 0; transition: var(--transition);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
}
.case-nav.scrolled {
  background: rgba(5, 7, 15, 0.8);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}
.case-nav-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.back-btn {
  display: inline-flex; align-items: center; gap: 8px;
  color: var(--text-2); text-decoration: none; font-size: 14px; font-weight: 600;
  padding: 8px 16px; border-radius: 10px; border: 1px solid var(--border);
  transition: var(--transition); background: var(--surface);
}
.back-btn:hover { color: var(--cyan); border-color: var(--border-strong); }
.case-nav-title { font-size: 14px; color: var(--text-3); }

/* 通用 */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ============ Hero ============ */
.case-hero {
  min-height: 90vh; display: flex; align-items: center; justify-content: center;
  text-align: center; padding: 120px 0 60px; position: relative;
}
.case-hero-tag {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 18px; border: 1px solid var(--border-strong); border-radius: 100px;
  font-size: 13px; color: var(--cyan); background: rgba(0, 240, 255, 0.05);
  margin-bottom: 28px; animation: fadeUp 0.8s ease both;
}
.case-hero-tag .dot {
  width: 8px; height: 8px; border-radius: 50%; background: var(--cyan);
  box-shadow: 0 0 10px var(--cyan); animation: pulse 2s infinite;
}
.case-hero h1 {
  font-size: clamp(36px, 6vw, 68px); font-weight: 900; line-height: 1.15;
  letter-spacing: -1px; margin-bottom: 24px; animation: fadeUp 0.8s ease 0.1s both;
}
.case-hero h1 .grad {
  background: linear-gradient(120deg, var(--cyan) 0%, var(--blue) 50%, var(--purple) 100%);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.case-hero-sub {
  font-size: 20px; color: var(--text-2); max-width: 640px; margin: 0 auto 36px;
  animation: fadeUp 0.8s ease 0.2s both;
}
.case-hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; animation: fadeUp 0.8s ease 0.3s both; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 28px; border-radius: 12px; font-size: 15px; font-weight: 700;
  text-decoration: none; border: none; cursor: pointer; transition: var(--transition);
}
.btn-primary {
  background: linear-gradient(135deg, var(--cyan), var(--blue)); color: #05070f;
  box-shadow: 0 6px 24px rgba(0, 240, 255, 0.35);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 12px 40px rgba(0, 240, 255, 0.5); }
.btn-ghost { background: transparent; color: var(--text-1); border: 1px solid var(--border-strong); }
.btn-ghost:hover { border-color: var(--cyan); color: var(--cyan); }

/* ============ 特性区块 (交替左右) ============ */
.feature-section {
  padding: 80px 0; position: relative;
}
.feature-row {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
}
.feature-row.reverse { direction: rtl; }
.feature-row.reverse > * { direction: ltr; }
.feature-num {
  font-size: 13px; color: var(--cyan); font-weight: 700; letter-spacing: 3px;
  margin-bottom: 14px; text-transform: uppercase;
}
.feature-section h2 {
  font-size: clamp(24px, 3.5vw, 36px); font-weight: 800; line-height: 1.25;
  margin-bottom: 18px;
}
.feature-section h2 .accent { color: var(--cyan); }
.feature-section p {
  font-size: 16px; color: var(--text-2); line-height: 1.9;
}
.feature-media {
  position: relative; border-radius: 20px; overflow: hidden;
  border: 1px solid var(--border);
  background: radial-gradient(circle at 50% 50%, rgba(0, 102, 255, 0.08), transparent 70%);
}
.feature-media img {
  width: 100%; display: block; border-radius: 20px;
}
.feature-media::before {
  content: ""; position: absolute; inset: 0; border-radius: 20px;
  border: 1px solid transparent;
  background: linear-gradient(135deg, var(--cyan), transparent 50%, var(--purple)) border-box;
  -webkit-mask: linear-gradient(#000 0 0) padding-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
  pointer-events: none; opacity: 0.5;
}

/* ============ 应用场景 ============ */
.scenarios { padding: 100px 0; }
.section-head { text-align: center; margin-bottom: 60px; }
.section-tag {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; color: var(--cyan); text-transform: uppercase; letter-spacing: 3px; margin-bottom: 16px;
}
.section-tag::before, .section-tag::after { content: ""; width: 30px; height: 1px; background: linear-gradient(90deg, transparent, var(--cyan)); }
.section-tag::after { background: linear-gradient(90deg, var(--cyan), transparent); }
.section-title { font-size: clamp(28px, 4vw, 44px); font-weight: 800; line-height: 1.2; margin-bottom: 16px; }
.section-title .grad { background: linear-gradient(120deg, var(--cyan), var(--purple)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.section-sub { color: var(--text-2); font-size: 16px; max-width: 640px; margin: 0 auto; }

.scenario-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.scenario-card {
  padding: 32px 28px; background: var(--surface); border: 1px solid var(--border);
  border-radius: 18px; backdrop-filter: blur(16px); transition: var(--transition); text-align: center;
}
.scenario-card:hover { transform: translateY(-6px); border-color: var(--border-strong); box-shadow: 0 16px 40px rgba(0, 102, 255, 0.15); }
.scenario-icon {
  width: 56px; height: 56px; border-radius: 14px; margin: 0 auto 18px;
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.15), rgba(124, 58, 237, 0.1));
  display: flex; align-items: center; justify-content: center; color: var(--cyan); font-size: 26px;
}
.scenario-card h3 { font-size: 18px; margin-bottom: 10px; }
.scenario-card p { font-size: 14px; color: var(--text-2); }

/* 巡检场景图片 */
.inspect-cases { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 40px; }
.inspect-case {
  position: relative; border-radius: 16px; overflow: hidden;
  border: 1px solid var(--border); transition: var(--transition);
}
.inspect-case:hover { border-color: var(--border-strong); transform: translateY(-4px); }
.inspect-case img { width: 100%; display: block; transition: var(--transition); }
.inspect-case:hover img { transform: scale(1.05); }
.inspect-case-label {
  position: absolute; bottom: 0; left: 0; right: 0;
  padding: 16px 20px; background: linear-gradient(180deg, transparent, rgba(0, 0, 0, 0.8));
  font-size: 15px; font-weight: 700; color: var(--text-1);
}

/* ============ 性能参数 ============ */
.perf-section { padding: 100px 0; }
.perf-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 20px; }
.perf-card {
  text-align: center; padding: 28px 16px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 16px;
  transition: var(--transition);
}
.perf-card:hover { border-color: var(--border-strong); transform: translateY(-4px); }
.perf-card .symbol { font-size: 14px; color: var(--text-3); margin-bottom: 4px; }
.perf-card .value {
  font-size: 36px; font-weight: 800; line-height: 1;
  background: linear-gradient(120deg, var(--cyan), var(--blue));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  margin-bottom: 8px;
}
.perf-card .unit { font-size: 14px; color: var(--text-2); }

/* ============ 智能巡视系统 ============ */
.smart-section { padding: 100px 0; }
.smart-banner {
  border-radius: 20px; overflow: hidden; border: 1px solid var(--border);
  margin-bottom: 40px; position: relative;
}
.smart-banner img { width: 100%; display: block; }
.smart-features { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.smart-feature {
  background: var(--surface); border: 1px solid var(--border); border-radius: 16px;
  overflow: hidden; transition: var(--transition);
}
.smart-feature:hover { border-color: var(--border-strong); transform: translateY(-4px); }
.smart-feature img { width: 100%; display: block; height: 160px; object-fit: cover; }
.smart-feature-body { padding: 18px; }
.smart-feature-body h4 { font-size: 15px; margin-bottom: 6px; }
.smart-feature-body p { font-size: 13px; color: var(--text-3); }

/* ============ 快速部署 ============ */
.deploy-section { padding: 100px 0; }
.deploy-row { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }
.deploy-img { border-radius: 20px; overflow: hidden; border: 1px solid var(--border); }
.deploy-img img { width: 100%; display: block; }
.deploy-features { display: flex; flex-direction: column; gap: 16px; }
.deploy-item {
  display: flex; gap: 16px; padding: 18px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
  transition: var(--transition);
}
.deploy-item:hover { border-color: var(--border-strong); transform: translateX(6px); }
.deploy-item-num {
  flex-shrink: 0; width: 36px; height: 36px; border-radius: 10px;
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.15), rgba(124, 58, 237, 0.1));
  display: flex; align-items: center; justify-content: center;
  color: var(--cyan); font-size: 14px; font-weight: 800;
}
.deploy-item h4 { font-size: 15px; margin-bottom: 4px; }
.deploy-item p { font-size: 13px; color: var(--text-3); }

/* ============ 原始视频 ============ */
.video-section { padding: 100px 0; text-align: center; }
.video-wrapper {
  max-width: 800px; margin: 0 auto; border-radius: 20px; overflow: hidden;
  border: 1px solid var(--border-strong); box-shadow: 0 0 60px rgba(0, 240, 255, 0.1);
}
.video-wrapper video { width: 100%; display: block; }

/* ============ 底部返回 ============ */
.case-footer { padding: 60px 0 40px; text-align: center; border-top: 1px solid var(--border); }

/* ============ 滚动动画 ============ */
.reveal { opacity: 0; transform: translateY(50px); transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.22, 1, 0.36, 1); }
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-left { opacity: 0; transform: translateX(-50px); transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.22, 1, 0.36, 1); }
.reveal-left.visible { opacity: 1; transform: translateX(0); }
.reveal-right { opacity: 0; transform: translateX(50px); transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.22, 1, 0.36, 1); }
.reveal-right.visible { opacity: 1; transform: translateX(0); }
.reveal-scale { opacity: 0; transform: scale(0.9); transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.22, 1, 0.36, 1); }
.reveal-scale.visible { opacity: 1; transform: scale(1); }

@keyframes fadeUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes pulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: 0.5; transform: scale(0.8); } }

/* ============ 响应式 ============ */
@media (max-width: 968px) {
  .feature-row, .feature-row.reverse, .deploy-row { grid-template-columns: 1fr; gap: 30px; }
  .feature-row.reverse { direction: ltr; }
  .scenario-grid, .inspect-cases { grid-template-columns: 1fr; }
  .perf-grid { grid-template-columns: repeat(3, 1fr); }
  .smart-features { grid-template-columns: repeat(2, 1fr); }
  section, .feature-section, .scenarios, .perf-section, .smart-section, .deploy-section, .video-section { padding: 60px 0; }
}
@media (max-width: 568px) {
  .perf-grid { grid-template-columns: repeat(2, 1fr); }
  .smart-features { grid-template-columns: 1fr; }
}