:root {
  --primary: #4CAF50;
  --secondary: #388E3C;
  --text: #333333;
  --light: #F5F5F5;
  --accent: #E8F5E9;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

body {
  color: var(--text);
  line-height: 1.6;
}

section {
  padding: 5rem 2rem;
}

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

.hero {
  background: linear-gradient(135deg, var(--accent), var(--light));
  min-height: 80vh;
  display: flex;
  align-items: center;
  text-align: center;
}

h1 {
  font-size: 3.5rem;
  margin-bottom: 1.5rem;
  color: var(--secondary);
}

h2 {
  font-size: 2.5rem;
  margin-bottom: 2rem;
  color: var(--secondary);
}

.subtitle {
  font-size: 1.5rem;
  margin-bottom: 2rem;
  color: var(--text);
}

.metronome-container {
  background: white;
  padding: 2rem;
  border-radius: 10px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  margin: 2rem auto;
  max-width: 400px;
}

.bpm-display {
  font-size: 3rem;
  font-weight: bold;
  color: var(--primary);
  margin: 1rem 0;
}

.controls {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin: 1rem 0;
}

.btn {
  display: inline-block;
  padding: 1rem 2rem;
  background: var(--primary);
  color: white;
  text-decoration: none;
  border-radius: 5px;
  transition: background 0.3s;
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

.btn:hover {
  background: var(--secondary);
}

.features {
  background: white;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.feature-card {
  padding: 2rem;
  border-radius: 10px;
  background: var(--light);
  transition: transform 0.3s;
  text-align: center;
}

.feature-card:hover {
  transform: translateY(-5px);
}

.feature-icon {
  font-size: 2.5rem;
  color: var(--primary);
  margin-bottom: 1rem;
}

.benefits {
  background: var(--accent);
}

.benefit-list {
  list-style: none;
  margin-top: 2rem;
}

.benefit-item {
  display: flex;
  align-items: center;
  margin-bottom: 1.5rem;
  background: white;
  padding: 1.5rem;
  border-radius: 10px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.benefit-icon {
  font-size: 1.5rem;
  color: var(--primary);
  margin-right: 1rem;
}

footer {
  background: var(--secondary);
  color: white;
  padding: 3rem 2rem;
  text-align: center;
}

#bpmSlider {
  width: 100%;
  margin: 1rem 0;
}

.preset-buttons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  gap: 0.5rem;
  margin: 1rem 0;
}

.preset-btn {
  background: var(--light);
  border: 2px solid var(--primary);
  color: var(--primary);
  padding: 0.5rem;
  border-radius: 5px;
  cursor: pointer;
  transition: all 0.3s;
}

.preset-btn:hover {
  background: var(--primary);
  color: white;
}