:root {
  --primary-bg: #ffffff;
  --secondary-bg: #f5f5f5;
  --text-color: #333333;
  --border-color: #e0e0e0;
  --card-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  --hover-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  --transition: all 0.3s ease;
}

[data-theme="dark"] {
  --primary-bg: #1e1e1e;
  --secondary-bg: #2d2d2d;
  --text-color: #f0f0f0;
  --border-color: #444444;
  --card-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  --hover-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  transition: background-color 0.3s, color 0.3s;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--primary-bg);
  color: var(--text-color);
  line-height: 1.6;
}

.app-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
  padding-bottom: 15px;
  border-bottom: 1px solid var(--border-color);
}

.theme-toggle button {
  background: none;
  border: none;
  color: var(--text-color);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 5px;
}

.color-input-section {
  background-color: var(--secondary-bg);
  padding: 20px;
  border-radius: 10px;
  margin-bottom: 30px;
  box-shadow: var(--card-shadow);
}

.color-display {
  width: 100%;
  height: 100px;
  border-radius: 8px;
  margin-bottom: 20px;
  box-shadow: var(--card-shadow);
}

.input-group {
  display: flex;
  margin-bottom: 15px;
}

.input-group input {
  flex: 1;
  padding: 10px 15px;
  border: 1px solid var(--border-color);
  border-radius: 5px 0 0 5px;
  font-size: 1rem;
  background-color: var(--primary-bg);
  color: var(--text-color);
}

.input-group button {
  padding: 0 15px;
  background-color: #4a6fa5;
  color: white;
  border: none;
  border-radius: 0 5px 5px 0;
  cursor: pointer;
  font-size: 1rem;
}

.action-buttons {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}

.btn {
  padding: 10px 15px;
  background-color: #4a6fa5;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 5px;
}

.btn:hover {
  background-color: #3a5a8f;
}

.color-formats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 15px;
}

.format-box {
  background-color: var(--primary-bg);
  padding: 10px;
  border-radius: 5px;
  box-shadow: var(--card-shadow);
}

.format-box label {
  display: block;
  font-weight: bold;
  margin-bottom: 5px;
  font-size: 0.9rem;
}

.format-box span {
  display: inline-block;
  margin-right: 10px;
  font-family: monospace;
}

.copy-btn {
  background: none;
  border: none;
  color: var(--text-color);
  cursor: pointer;
}

.harmonies-section h2, .favorites-header h2 {
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
}

.harmonies-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.harmony-card {
  background-color: var(--secondary-bg);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--card-shadow);
}

.harmony-title {
  padding: 10px 15px;
  background-color: var(--primary-bg);
  font-weight: bold;
}

.harmony-colors {
  display: flex;
  height: 80px;
}

.color-item {
  flex: 1;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  align-items: center;
  padding: 10px;
  cursor: pointer;
}

.color-value {
  background-color: rgba(0, 0, 0, 0.7);
  color: white;
  padding: 2px 5px;
  border-radius: 3px;
  font-size: 0.8rem;
  margin-bottom: 5px;
  font-family: monospace;
}

.color-actions {
  position: absolute;
  top: 5px;
  right: 5px;
  display: flex;
  gap: 5px;
}

.color-actions button {
  background-color: rgba(255, 255, 255, 0.8);
  border: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transition: var(--transition);
}

.color-item:hover .color-actions button {
  opacity: 1;
}

.harmony-actions {
  padding: 10px;
  display: flex;
  justify-content: space-between;
  background-color: var(--primary-bg);
}

.favorites-section {
  margin-top: 30px;
}

.favorites-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.favorites-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 20px;
}

.favorite-card {
  background-color: var(--secondary-bg);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: var(--transition);
  cursor: pointer;
}

.favorite-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--hover-shadow);
}

.favorite-color {
  height: 100px;
  position: relative;
}

.favorite-info {
  padding: 10px;
  text-align: center;
}

.favorite-hex {
  font-family: monospace;
  font-weight: bold;
}

.favorite-actions {
  position: absolute;
  bottom: 10px;
  right: 10px;
}

.color-picker-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.notification {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  background-color: #4CAF50;
  color: white;
  padding: 10px 20px;
  border-radius: 5px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
  opacity: 0;
  transition: opacity 0.3s;
  z-index: 1001;
}

.notification.show {
  opacity: 1;
}

.hidden {
  display: none;
}

@media (max-width: 768px) {
  .harmonies-grid {
    grid-template-columns: 1fr;
  }
  
  .favorites-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .action-buttons {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
}