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

:root {
  --primary-yellow: #fff9e6;
  --secondary-yellow: #ffe066;
  --accent-yellow: #ffd93d;
  --white: #ffffff;
  --text-dark: #333333;
  --text-gray: #666666;
  --text-light: #999999;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.8;
  color: var(--text-dark);
  background-color: var(--primary-yellow);
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.navbar {
  background: var(--white);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: 15px 0;
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(
    135deg,
    var(--accent-yellow),
    var(--secondary-yellow)
  );
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 24px;
  font-weight: bold;
}

.logo-text {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-dark);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 40px;
}

.nav-menu a {
  text-decoration: none;
  color: var(--text-gray);
  font-size: 16px;
  font-weight: 500;
  transition: all 0.3s ease;
  position: relative;
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--accent-yellow);
}

.nav-menu a::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-yellow);
  transition: width 0.3s ease;
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
  width: 100%;
}

.hero {
  background: linear-gradient(
    135deg,
    var(--primary-yellow) 0%,
    var(--white) 100%
  );
  padding: 80px 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(
    circle,
    var(--secondary-yellow) 0%,
    transparent 70%
  );
  opacity: 0.3;
  animation: float 6s ease-in-out infinite;
}

.video-3d-container {
  perspective: 1000px;
  width: 100%;
  height: 400px;
  margin-bottom: 40px;
}

.video-wrapper {
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.3s ease;
  position: relative;
}

.video-wrapper::before {
  content: "";
  position: absolute;
  top: 10px;
  left: 10px;
  right: -10px;
  bottom: -10px;
  background: linear-gradient(
    135deg,
    var(--secondary-yellow),
    var(--accent-yellow)
  );
  border-radius: 20px;
  z-index: -1;
  transform: translateZ(-30px);
  transition: all 0.3s ease;
}

.video-wrapper::after {
  content: "";
  position: absolute;
  top: 20px;
  left: 20px;
  right: -20px;
  bottom: -20px;
  background: rgba(255, 217, 61, 0.3);
  border-radius: 20px;
  z-index: -2;
  transform: translateZ(-60px);
  transition: all 0.3s ease;
}

.hero-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 15px;
  box-shadow:
    0 20px 60px rgba(0, 0, 0, 0.3),
    0 10px 30px rgba(0, 0, 0, 0.2),
    inset 0 0 0 1px rgba(255, 255, 255, 0.1);
  transition: all 0.3s ease;
  transform: translateZ(0);
}

.video-3d-container:hover .video-wrapper {
  transform: rotateX(5deg) rotateY(5deg) translateZ(20px);
}

.video-3d-container:hover .video-wrapper::before {
  transform: translateZ(-40px);
  box-shadow:
    0 30px 80px rgba(0, 0, 0, 0.4),
    0 15px 40px rgba(0, 0, 0, 0.3);
}

.video-3d-container:hover .video-wrapper::after {
  transform: translateZ(-80px);
}

.video-3d-container:hover .hero-video {
  box-shadow:
    0 30px 90px rgba(0, 0, 0, 0.4),
    0 15px 50px rgba(0, 0, 0, 0.3),
    inset 0 0 0 1px rgba(255, 255, 255, 0.2);
  transform: translateZ(10px);
}

.hero .container {
  display: flex;
  align-items: center;
  gap: 60px;
}

.hero-content {
  flex: 1;
}

.hero-title {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--text-dark), var(--text-gray));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 28px;
  color: var(--text-gray);
  margin-bottom: 20px;
  font-weight: 500;
}

.hero-description {
  font-size: 18px;
  color: var(--text-gray);
  margin-bottom: 30px;
  line-height: 1.8;
}

.hero-image {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

.floating-card {
  background: var(--white);
  padding: 40px;
  border-radius: 20px;
  box-shadow: var(--shadow);
  text-align: center;
  animation: float 4s ease-in-out infinite;
}

.card-icon {
  font-size: 60px;
  margin-bottom: 20px;
}

.card-text {
  font-size: 24px;
  font-weight: 600;
  color: var(--text-dark);
}

.section {
  padding: 80px 0;
}

.section-alt {
  background: var(--white);
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 60px;
  color: var(--text-dark);
}

.section-subtitle {
  font-size: 28px;
  font-weight: 600;
  text-align: center;
  margin-bottom: 40px;
  color: var(--text-dark);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
  gap: 30px;
}

.feature-card {
  background: var(--white);
  padding: 40px;
  border-radius: 16px;
  box-shadow: var(--shadow);
  transition: all 0.4s ease;
}

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-hover);
}

.feature-icon {
  font-size: 48px;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-dark);
}

.feature-card h4 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 15px;
  color: var(--accent-yellow);
}

.feature-card p {
  color: var(--text-gray);
  margin-bottom: 20px;
}

.feature-list {
  list-style: none;
}

.feature-list li {
  padding: 10px 0;
  padding-left: 20px;
  position: relative;
  color: var(--text-gray);
}

.feature-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent-yellow);
  font-weight: bold;
}

.feature-list li strong {
  color: var(--text-dark);
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 30px;
  margin-bottom: 60px;
}

.guide-card {
  background: var(--primary-yellow);
  padding: 40px;
  border-radius: 16px;
  transition: all 0.4s ease;
}

.guide-card:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow);
}

.guide-number {
  font-size: 48px;
  font-weight: 700;
  color: var(--accent-yellow);
  margin-bottom: 20px;
}

.guide-card h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-dark);
}

.guide-card ul {
  list-style: none;
}

.guide-card li {
  padding: 10px 0;
  padding-left: 20px;
  position: relative;
  color: var(--text-gray);
}

.guide-card li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--accent-yellow);
  font-size: 20px;
}

.advantage-section {
  margin-top: 60px;
}

.advantage-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
}

.advantage-item {
  background: var(--white);
  padding: 30px;
  border-radius: 16px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: all 0.4s ease;
}

.advantage-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.advantage-icon {
  font-size: 48px;
  margin-bottom: 20px;
}

.advantage-item h4 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text-dark);
}

.advantage-item p {
  color: var(--text-gray);
}

.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
  gap: 30px;
}

.module-card {
  background: var(--white);
  border-radius: 16px;
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: all 0.4s ease;
}

.module-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-hover);
}

.module-header {
  background: linear-gradient(
    135deg,
    var(--accent-yellow),
    var(--secondary-yellow)
  );
  padding: 30px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.module-icon {
  font-size: 48px;
}

.module-header h3 {
  font-size: 24px;
  font-weight: 700;
  color: var(--white);
}

.module-tag {
  background: var(--white);
  color: var(--accent-yellow);
  padding: 5px 15px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
}

.module-content {
  padding: 30px;
}

.module-content p {
  color: var(--text-gray);
  margin-bottom: 20px;
}

.module-content ul {
  list-style: none;
}

.module-content li {
  padding: 10px 0;
  padding-left: 20px;
  position: relative;
  color: var(--text-gray);
}

.module-content li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--accent-yellow);
  font-size: 18px;
}

.module-content li strong {
  color: var(--text-dark);
}

.feature-highlight {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
  gap: 30px;
  margin-bottom: 60px;
}

.highlight-item {
  background: var(--primary-yellow);
  padding: 40px;
  border-radius: 16px;
  display: flex;
  gap: 30px;
  align-items: flex-start;
  transition: all 0.4s ease;
}

.highlight-item:hover {
  transform: translateX(10px);
  box-shadow: var(--shadow);
}

.highlight-icon {
  font-size: 48px;
  flex-shrink: 0;
}

.highlight-content h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 15px;
  color: var(--text-dark);
}

.highlight-content p {
  color: var(--text-gray);
  line-height: 1.8;
}

.tech-specs {
  margin-top: 60px;
}

.spec-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.spec-card {
  background: var(--white);
  padding: 40px;
  border-radius: 16px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: all 0.4s ease;
}

.spec-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.spec-icon {
  font-size: 48px;
  margin-bottom: 20px;
}

.spec-card h4 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text-dark);
}

.spec-card p {
  color: var(--text-gray);
}

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
}

.scenario-card {
  background: var(--white);
  padding: 40px;
  border-radius: 16px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: all 0.4s ease;
}

.scenario-card:hover {
  transform: translateY(-10px) rotate(2deg);
  box-shadow: var(--shadow-hover);
}

.scenario-icon {
  font-size: 60px;
  margin-bottom: 20px;
}

.scenario-card h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 15px;
  color: var(--text-dark);
}

.scenario-card p {
  color: var(--text-gray);
}

.summary-box {
  background: linear-gradient(135deg, var(--primary-yellow), var(--white));
  padding: 60px;
  border-radius: 20px;
  text-align: center;
  box-shadow: var(--shadow);
}

.summary-box h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 30px;
  color: var(--text-dark);
}

.summary-box p {
  font-size: 18px;
  color: var(--text-gray);
  margin-bottom: 20px;
  line-height: 1.8;
}

.btn {
  display: inline-block;
  padding: 15px 40px;
  border-radius: 30px;
  text-decoration: none;
  font-weight: 600;
  font-size: 18px;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(
    135deg,
    var(--accent-yellow),
    var(--secondary-yellow)
  );
  color: var(--white);
  box-shadow: 0 4px 15px rgba(255, 217, 61, 0.4);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(255, 217, 61, 0.6);
}

.btn-large {
  padding: 20px 60px;
  font-size: 20px;
}

.footer {
  background: var(--white);
  padding: 40px 0;
  text-align: center;
  color: var(--text-gray);
  border-top: 1px solid #f0f0f0;
}

.footer p {
  margin: 0;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-20px);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleUp {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes rotateIn {
  from {
    opacity: 0;
    transform: rotate(-5deg);
  }
  to {
    opacity: 1;
    transform: rotate(0);
  }
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

.fade-in {
  animation: fadeIn 1s ease-out;
}

.fade-in-delay {
  animation: fadeIn 1s ease-out 0.2s both;
}

.fade-in-delay-2 {
  animation: fadeIn 1s ease-out 0.4s both;
}

.fade-in-delay-3 {
  animation: fadeIn 1s ease-out 0.6s both;
}

.slide-up {
  animation: slideUp 0.8s ease-out;
}

.slide-up-delay {
  animation: slideUp 0.8s ease-out 0.2s both;
}

.slide-up-delay-2 {
  animation: slideUp 0.8s ease-out 0.4s both;
}

.slide-up-delay-3 {
  animation: slideUp 0.8s ease-out 0.6s both;
}

.scale-up {
  animation: scaleUp 0.8s ease-out;
}

.scale-up-delay {
  animation: scaleUp 0.8s ease-out 0.2s both;
}

.scale-up-delay-2 {
  animation: scaleUp 0.8s ease-out 0.4s both;
}

.scale-up-delay-3 {
  animation: scaleUp 0.8s ease-out 0.6s both;
}

.rotate-in {
  animation: rotateIn 0.8s ease-out;
}

.rotate-in-delay {
  animation: rotateIn 0.8s ease-out 0.2s both;
}

.rotate-in-delay-2 {
  animation: rotateIn 0.8s ease-out 0.4s both;
}

.rotate-in-delay-3 {
  animation: rotateIn 0.8s ease-out 0.6s both;
}

.pulse {
  animation: pulse 2s ease-in-out infinite;
}

.pulse-delay {
  animation: pulse 2s ease-in-out 0.3s infinite;
}

.pulse-delay-2 {
  animation: pulse 2s ease-in-out 0.6s infinite;
}

.pulse-delay-3 {
  animation: pulse 2s ease-in-out 0.9s infinite;
}

.hover-lift {
  transition: all 0.4s ease;
}

.hover-lift:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-hover);
}

@media (max-width: 768px) {
  .hero .container {
    flex-direction: column;
    text-align: center;
  }

  .hero-title {
    font-size: 36px;
  }

  .hero-subtitle {
    font-size: 22px;
  }

  .video-3d-container {
    height: 250px;
  }

  .video-wrapper::before {
    top: 5px;
    left: 5px;
    right: -5px;
    bottom: -5px;
    transform: translateZ(-15px);
  }

  .video-wrapper::after {
    top: 10px;
    left: 10px;
    right: -10px;
    bottom: -10px;
    transform: translateZ(-30px);
  }

  .feature-grid,
  .module-grid,
  .feature-highlight {
    grid-template-columns: 1fr;
  }

  .nav-menu {
    gap: 20px;
  }

  .section {
    padding: 60px 0;
  }
}