:root {
  --bg-gradient: radial-gradient(circle at top left, #26a0da 0%, rgba(11, 20, 46, 0.85) 35%),
    radial-gradient(circle at bottom right, rgba(255, 0, 132, 0.35) 0%, rgba(5, 10, 28, 0.9) 55%),
    linear-gradient(135deg, #050a1c 0%, #070f2c 100%);
  --primary: #00e0ff;
  --accent: #ff4ecd;
  --text-primary: #f5f7ff;
  --text-secondary: rgba(235, 245, 255, 0.75);
  --card-bg: rgba(10, 20, 50, 0.65);
  --card-border: rgba(0, 224, 255, 0.35);
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
}

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

body {
  font-family: 'Nunito', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  min-height: 100vh;
  color: var(--text-primary);
  background: #050a1c;
  overflow-x: hidden;
}

.background {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image: var(--bg-gradient);
  background-size: cover;
  filter: saturate(120%);
}

.grid {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(0, 224, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 78, 205, 0.05) 1px, transparent 1px);
  background-size: 120px 120px;
  animation: drift 18s linear infinite;
}

.orb {
  position: absolute;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  filter: blur(65px);
  opacity: 0.55;
}

.orb-1 {
  top: -120px;
  right: -60px;
  background: rgba(0, 224, 255, 0.45);
  animation: pulse 12s ease-in-out infinite;
}

.orb-2 {
  bottom: -160px;
  left: -40px;
  background: rgba(255, 78, 205, 0.4);
  animation: pulse 16s ease-in-out infinite reverse;
}

.orb-3 {
  top: 40vh;
  left: 60vw;
  width: 320px;
  height: 320px;
  background: rgba(120, 90, 255, 0.35);
  animation: pulse 20s ease-in-out infinite;
}

.hero {
  position: relative;
  max-width: 1080px;
  margin: 0 auto;
  padding: 120px 24px 80px;
  text-align: center;
}

.hero__header h1 {
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(2.8rem, 6vw, 4.2rem);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 20px;
  text-shadow: 0 10px 35px rgba(0, 224, 255, 0.5);
}

.subtitle {
  font-size: 1.15rem;
  line-height: 1.8;
  color: var(--text-secondary);
  max-width: 620px;
  margin: 0 auto 60px;
}

.features {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin-bottom: 60px;
}

.feature-card {
  background: var(--card-bg);
  border: 1px solid transparent;
  border-image: linear-gradient(135deg, rgba(0, 224, 255, 0.4), rgba(255, 78, 205, 0.35)) 1;
  border-radius: 24px;
  padding: 32px 28px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  transition: transform 0.4s ease, box-shadow 0.4s ease, border 0.4s ease;
}

.feature-card h2 {
  font-family: 'Orbitron', sans-serif;
  font-weight: 600;
  font-size: 1.4rem;
  margin-bottom: 16px;
  color: var(--primary);
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.7;
}

.feature-card:hover {
  transform: translateY(-12px);
  box-shadow: 0 24px 65px rgba(0, 224, 255, 0.2);
}

.cta {
  display: flex;
  flex-direction: column;
  gap: 18px;
  align-items: center;
}

.cta__button,
.cta__ghost {
  font-family: 'Orbitron', sans-serif;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 18px 48px;
  border-radius: 999px;
  font-size: 0.95rem;
  cursor: pointer;
  transition: transform 0.35s ease, box-shadow 0.35s ease, background 0.35s ease;
  border: none;
}

.cta__button {
  background: linear-gradient(135deg, rgba(0, 224, 255, 0.95), rgba(255, 78, 205, 0.85));
  color: #050a1c;
  box-shadow: 0 18px 45px rgba(0, 224, 255, 0.35);
}

.cta__button:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: 0 24px 55px rgba(255, 78, 205, 0.35);
}

.cta__ghost {
  background: transparent;
  border: 1.5px solid rgba(0, 224, 255, 0.6);
  color: var(--text-primary);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4);
}

.cta__ghost:hover {
  transform: translateY(-5px);
  background: rgba(0, 224, 255, 0.08);
}

.cta__hint {
  color: var(--text-secondary);
  font-size: 0.95rem;
  letter-spacing: 0.05em;
}

.footer {
  position: relative;
  padding: 32px 0 48px;
  color: rgba(200, 215, 255, 0.6);
  font-size: 0.9rem;
}

.footer__content {
  display: flex;
  justify-content: center;
  gap: 18px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-family: 'Orbitron', sans-serif;
}

@keyframes drift {
  0% {
    transform: translate3d(0, 0, 0);
  }
  100% {
    transform: translate3d(60px, 60px, 0);
  }
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 0.55;
  }
  50% {
    transform: scale(1.15);
    opacity: 0.8;
  }
}

@media (max-width: 768px) {
  .hero {
    padding: 100px 18px 64px;
  }

  .subtitle {
    margin-bottom: 48px;
  }

  .cta__button,
  .cta__ghost {
    width: 100%;
    max-width: 320px;
  }

  .footer__content {
    flex-direction: column;
    gap: 10px;
  }
}