:root {
  --primary: #667eea;
  --secondary: #764ba2;
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --text: #2d3748;
  --border: #e2e8f0;
  --success: #48bb78;
  --shadow: rgba(0, 0, 0, 0.1);
  --shadow-hover: rgba(0, 0, 0, 0.15);
  --transition: all 0.3s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  min-height: 100vh;
  padding: 20px;
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  background: var(--card-bg);
  border-radius: 20px;
  box-shadow: 0 20px 40px var(--shadow);
  overflow: hidden;
}

header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: white;
  text-align: center;
  padding: 2rem;
}

header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

header p {
  font-size: 1.1rem;
  opacity: 0.9;
}

main {
  padding: 2rem;
}

.palette-section {
  margin-bottom: 3rem;
}

.palette-container {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.color-box {
  background: var(--card-bg);
  border-radius: 12px;
  box-shadow: 0 4px 12px var(--shadow);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
  position: relative;
}

.color-box:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px var(--shadow-hover);
}

.color-box.locked {
  border: 2px solid var(--primary);
}

.color-box.locked::before {
  content: "";
  position: absolute;
  top: 8px;
  right: 8px;
  width: 20px;
  height: 20px;
  background: var(--primary);
  border-radius: 50%;
  z-index: 1;
}

.color-display {
  height: 120px;
  width: 100%;
  transition: var(--transition);
}

.color-info {
  padding: 1rem;
  text-align: center;
}

.hex-code {
  font-family: "Courier New", monospace;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  text-transform: uppercase;
  display: block;
  margin-bottom: 0.5rem;
}

.color-actions {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
}

.copy-btn,
.lock-btn {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.5rem;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.copy-btn:hover,
.lock-btn:hover {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.lock-btn.locked {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

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

.generate-btn,
.save-btn {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: white;
  border: none;
  border-radius: 12px;
  padding: 1rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 12px var(--shadow);
}

.generate-btn:hover,
.save-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px var(--shadow-hover);
}

.generate-btn:active,
.save-btn:active {
  transform: translateY(0);
}

.favorites-section {
  border-top: 1px solid var(--border);
  padding-top: 2rem;
}

.favorites-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.favorites-header h2 {
  color: var(--text);
  font-size: 1.8rem;
  font-weight: 600;
}

.clear-favorites-btn {
  background: #e53e3e;
  color: white;
  border: none;
  border-radius: 8px;
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
}

.clear-favorites-btn:hover {
  background: #c53030;
}

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

.no-favorites {
  grid-column: 1 / -1;
  text-align: center;
  padding: 2rem;
  color: #718096;
}

.favorite-palette {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  box-shadow: 0 2px 8px var(--shadow);
  transition: var(--transition);
  cursor: pointer;
}

.favorite-palette:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow-hover);
}

.favorite-colors {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.favorite-color {
  flex: 1;
  height: 40px;
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition);
}

.favorite-color:hover {
  transform: scale(1.05);
}

.favorite-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.load-palette-btn {
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 6px;
  padding: 0.5rem 1rem;
  font-size: 0.8rem;
  cursor: pointer;
  transition: var(--transition);
}

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

.delete-palette-btn {
  background: #e53e3e;
  color: white;
  border: none;
  border-radius: 6px;
  padding: 0.5rem;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.delete-palette-btn:hover {
  background: #c53030;
}

.copy-feedback {
  position: fixed;
  top: 20px;
  right: 20px;
  background: var(--success);
  color: white;
  padding: 1rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  transform: translateX(100%);
  transition: var(--transition);
  z-index: 1000;
}

.copy-feedback.show {
  transform: translateX(0);
}

@media (max-width: 768px) {
  .palette-container {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .color-box {
    display: flex;
    align-items: center;
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 4px 12px var(--shadow);
    overflow: hidden;
  }

  .color-display {
    width: 80px;
    height: 80px;
    flex-shrink: 0;
  }

  .color-info {
    flex: 1;
    padding: 1rem;
    text-align: left;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .hex-code {
    margin-bottom: 0;
  }

  .controls {
    flex-direction: column;
  }

  .generate-btn,
  .save-btn {
    width: 100%;
  }

  .favorites-header {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .favorites-container {
    grid-template-columns: 1fr;
  }

  header h1 {
    font-size: 2rem;
  }

  main {
    padding: 1rem;
  }
}

@media (max-width: 480px) {
  body {
    padding: 10px;
  }

  .container {
    border-radius: 12px;
  }

  header {
    padding: 1.5rem;
  }

  header h1 {
    font-size: 1.8rem;
  }

  .color-display {
    width: 60px;
    height: 60px;
  }

  .color-actions {
    flex-direction: column;
    gap: 0.25rem;
  }

  .copy-btn,
  .lock-btn {
    padding: 0.4rem;
  }
}