:root {
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --accent-color: #4f46e5;
}

html,
body {
  height: 100%;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  display: flex;
  flex-direction: column;
}

.hero-section {
  background: var(--primary-gradient);
  color: white;
  padding: 4rem 0;
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
  animation: float 20s ease-in-out infinite;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0px) rotate(0deg);
  }
  50% {
    transform: translateY(-20px) rotate(180deg);
  }
}

.hero-content {
  position: relative;
  z-index: 2;
}

.course-badge {
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 50px;
  padding: 0.5rem 1.5rem;
  display: inline-block;
  margin-bottom: 1.5rem;
  font-weight: 500;
  animation: pulse 2s infinite;
  color: whitesmoke;
}

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

.display-1 {
  font-weight: 700;
  margin-bottom: 1.5rem;
  text-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.exercise-cards {
  margin-top: -3rem;
  position: relative;
  z-index: 3;
}

.exercise-card {
  background: white;
  border-radius: 20px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
  transition: all 0.4s ease;
  border: none;
  overflow: hidden;
  position: relative;
}

.exercise-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--secondary-gradient);
}

.exercise-card:hover {
  transform: translateY(-10px) scale(1.02);
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.15);
}

.exercise-card .card-body {
  padding: 2.5rem;
}

.exercise-card .card-body .card-title {
  height: 4rem;
}

.exercise-icon {
  width: 80px;
  height: 80px;
  background: var(--primary-gradient);
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  transition: all 0.3s ease;
}

.exercise-card:hover .exercise-icon {
  transform: rotate(5deg) scale(1.1);
}

.exercise-icon i {
  font-size: 2rem;
  color: white;
}

.btn-custom {
  background: var(--accent-color);
  border: none;
  border-radius: 50px;
  padding: 0.75rem 2rem;
  font-weight: 600;
  color: white;
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-block;
}

.btn-custom:hover {
  background: #3730a3;
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(79, 70, 229, 0.3);
  color: white;
}

.main-content {
  flex: 1;
}

.footer-section {
  background: #1a1a2e;
  color: #8892b0;
  padding: 3rem 0;
  margin-top: auto;
}

.tech-stack {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 2rem;
}

.tech-badge {
  background: rgba(255, 255, 255, 0.1);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 500;
}

@media (max-width: 768px) {
  .hero-section {
    padding: 2rem 0;
  }

  .display-1 {
    font-size: 2.5rem;
  }

  .exercise-card .card-body {
    padding: 2rem;
  }
}