:root {
  --primary: #8b5cf6;
  --primary-dark: #7c3aed;
  --secondary: #10b981;
  --accent: #ec4899;
  --dark: #0f172a;
  --light: #f8fafc;
  --tech-glow: 0 0 15px rgba(139, 92, 246, 0.7);
  --neon-glow: 0 0 20px rgba(236, 72, 153, 0.5);
  --gold: #FFD700;
  --platinum: #E5E4E2;
}
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--light);
  line-height: 1.6;
  min-height: 100vh;
  background: 
    radial-gradient(circle at 10% 20%, rgba(139, 92, 246, 0.2) 0%, transparent 25%),
    radial-gradient(circle at 90% 80%, rgba(16, 185, 129, 0.2) 0%, transparent 25%),
    linear-gradient(to bottom right, #0f172a, #1e1b4b),
    linear-gradient(135deg, rgba(255, 215, 0, 0.03) 0%, transparent 10%, transparent 90%, rgba(229, 228, 226, 0.03) 100%);
  background-attachment: fixed;
  animation: gradientPulse 15s ease infinite alternate, subtleGlow 8s ease-in-out infinite alternate;
}

@keyframes subtleGlow {
  0% { box-shadow: inset 0 0 50px rgba(255, 215, 0, 0.01); }
  50% { box-shadow: inset 0 0 100px rgba(255, 215, 0, 0.03); }
  100% { box-shadow: inset 0 0 50px rgba(229, 228, 226, 0.01); }
}
@keyframes gradientPulse {
  0% {
    background: 
      radial-gradient(circle at 10% 20%, rgba(139, 92, 246, 0.15) 0%, transparent 25%),
      radial-gradient(circle at 90% 80%, rgba(16, 185, 129, 0.15) 0%, transparent 25%),
      linear-gradient(to bottom right, #0f172a, #1e1b4b);
  }
  100% {
    background: 
      radial-gradient(circle at 15% 30%, rgba(139, 92, 246, 0.2) 0%, transparent 25%),
      radial-gradient(circle at 85% 70%, rgba(16, 185, 129, 0.2) 0%, transparent 25%),
      linear-gradient(to bottom right, #0f172a, #1e293b);
  }
}
h1, h2, h3, h4 {
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
  letter-spacing: -0.025em;
}
h1 {
  font-size: 4.5rem;
  background: linear-gradient(90deg, var(--primary), var(--accent), var(--gold));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 
    var(--tech-glow), 
    var(--neon-glow),
    0 0 10px rgba(255, 215, 0, 0.3);
  line-height: 1;
  margin-bottom: 1.5rem;
  position: relative;
  display: inline-block;
}

h1::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--gold), var(--accent));
  border-radius: 2px;
  animation: rainbowBorder 8s linear infinite;
}

@keyframes rainbowBorder {
  0% { background-position: 0% 50%; }
  100% { background-position: 100% 50%; }
}
h2 {
  font-size: 2.5rem;
  color: var(--light);
  position: relative;
  display: inline-block;
}

h2::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 3px;
}

p {
  color: rgba(248, 250, 252, 0.8);
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: all 0.3s ease;
}

a:hover {
  color: var(--secondary);
  text-shadow: var(--tech-glow);
}
.card {
  background: rgba(15, 23, 42, 0.9);
  backdrop-filter: blur(16px) saturate(200%);
  border: 1px solid rgba(139, 92, 246, 0.4);
  border-radius: 24px;
  padding: 2.5rem;
  margin: 1.5rem 0;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  box-shadow: 
    0 8px 32px rgba(0, 0, 0, 0.3),
    0 0 20px rgba(139, 92, 246, 0.1) inset;
  position: relative;
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(236, 72, 153, 0.1) 0%, transparent 70%);
  transform: rotate(45deg);
  transition: all 0.6s ease;
  opacity: 0;
}
.card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 15px 40px rgba(139, 92, 246, 0.4);
  border-color: rgba(236, 72, 153, 0.5);
  cursor: pointer;
}
.course-footer a {
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.course-footer a:hover {
  box-shadow: 0 6px 8px rgba(139, 92, 246, 0.3);
}
.card:hover::before {
  opacity: 1;
}
.btn {
  display: inline-block;
  background: linear-gradient(90deg, var(--primary), var(--accent), var(--gold));
  background-size: 200% 200%;
  color: white;
  padding: 1rem 2.5rem;
  border-radius: 50px;
  font-weight: 700;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  box-shadow: 
    var(--tech-glow), 
    var(--neon-glow),
    0 0 15px rgba(255, 215, 0, 0.3);
  position: relative;
  overflow: hidden;
  border: none;
  animation: gradientShift 4s ease infinite;
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}
.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: 0.5s;
}

.btn:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 10px 30px rgba(139, 92, 246, 0.6), 0 8px 25px rgba(236, 72, 153, 0.6);
  background: linear-gradient(90deg, var(--accent), var(--primary));
}

.btn:hover::before {
  left: 100%;
}

.btn:active {
  transform: translateY(-1px) scale(1.02);
}
@keyframes pulse {
  0% { 
    box-shadow: 0 0 0 0 rgba(139, 92, 246, 0.7), 0 0 0 0 rgba(236, 72, 153, 0.7); 
  }
  70% { 
    box-shadow: 0 0 0 15px rgba(139, 92, 246, 0), 0 0 0 10px rgba(236, 72, 153, 0); 
  }
  100% { 
    box-shadow: 0 0 0 0 rgba(139, 92, 246, 0), 0 0 0 0 rgba(236, 72, 153, 0); 
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

.floating {
  animation: float 6s ease-in-out infinite;
}
.tech-icon {
  font-size: 2rem;
  color: var(--primary);
  text-shadow: var(--tech-glow);
  transition: all 0.3s ease;
}

.tech-icon:hover {
  color: var(--secondary);
  transform: scale(1.1);
}

.glass-effect {
  background: rgba(15, 23, 42, 0.7);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: 16px;
}

.code-bg {
  position: relative;
  overflow: hidden;
}
.code-bg::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    linear-gradient(rgba(139, 92, 246, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(139, 92, 246, 0.03) 1px, transparent 1px);
  background-size: 20px 20px;
  z-index: -1;
}

/* Particle effect */
.particle {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  background: radial-gradient(circle, var(--primary) 0%, transparent 70%);
  opacity: 0.6;
  animation: float 15s linear infinite;
}

@keyframes particleMove {
  0% {
    transform: translate(0, 0) rotate(0deg);
    opacity: 1;
  }
  100% {
    transform: translate(var(--tx), var(--ty)) rotate(360deg);
    opacity: 0;
  }
}

/* Glass morphism */
.glass-morph {
  background: rgba(15, 23, 42, 0.7);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border: 1px solid rgba(139, 92, 246, 0.3);
  border-radius: 24px;
  box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
}