:root {
  --primary-color: #4a4e69;
  --secondary-color: #9a8c98;
  --accent-color: #c9ada7;
  --background-color: #f2e9e4;
  --text-color: #22223b;
  --font-size: 16px;
  --transition-speed: 0.3s;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  background-color: var(--background-color);
  color: var(--text-color);
  font-size: var(--font-size);
  transition: background-color var(--transition-speed), color var(--transition-speed);
}

body.dark-mode {
  --primary-color: #9a8c98;
  --secondary-color: #4a4e69;
  --accent-color: #c9ada7;
  --background-color: #22223b;
  --text-color: #f2e9e4;
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

h1, h2 {
  color: var(--primary-color);
  transition: color var(--transition-speed);
}

nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

nav button {
  background-color: var(--primary-color);
  color: var(--background-color);
  padding: 0.75rem 1rem;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition-speed) ease;
}

nav button:hover {
  background-color: var(--secondary-color);
  transform: translateY(-2px);
}

nav button.active {
  background-color: var(--accent-color);
  color: var(--text-color);
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

button {
  background-color: var(--accent-color);
  color: var(--text-color);
  padding: 0.75rem 1rem;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition-speed) ease;
}

button:hover {
  background-color: var(--secondary-color);
  color: var(--background-color);
}

.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.4);
  transition: background-color var(--transition-speed);
}

.modal-content {
  background-color: var(--background-color);
  margin: 15% auto;
  padding: 20px;
  border: 1px solid var(--secondary-color);
  width: 80%;
  max-width: 600px;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  transition: background-color var(--transition-speed), border-color var(--transition-speed), box-shadow var(--transition-speed);
}

.close {
  color: var(--secondary-color);
  float: right;
  font-size: 28px;
  font-weight: bold;
  cursor: pointer;
  transition: color var(--transition-speed);
}

.close:hover,
.close:focus {
  color: var(--primary-color);
  text-decoration: none;
  cursor: pointer;
}

#changelogContent,
#settingsContent {
  max-height: 400px;
  overflow-y: auto;
  padding-right: 10px;
}

#changelogButton,
#settingsButton {
  position: fixed;
  top: 20px;
  background-color: var(--primary-color);
  color: var(--background-color);
  border: none;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
  transition: background-color var(--transition-speed);
}

#changelogButton {
  right: 20px;
}

#settingsButton {
  right: 80px;
}

#changelogButton:hover,
#settingsButton:hover {
  background-color: var(--secondary-color);
}

#changelogButton svg,
#settingsButton svg {
  width: 30px;
  height: 30px;
  fill: var(--background-color);
  transition: fill var(--transition-speed);
}

.error-message {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background-color: #ff4444;
  color: white;
  padding: 10px 20px;
  border-radius: 5px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
  z-index: 1000;
  max-width: 80%;
  word-wrap: break-word;
}

.error-message .close-error {
  background: none;
  border: none;
  color: white;
  float: right;
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  margin-left: 10px;
}

@media (max-width: 768px) {
  main {
    padding: 1rem;
  }

  nav {
    grid-template-columns: 1fr;
  }

  #changelogButton,
  #settingsButton {
    top: 10px;
  }

  #changelogButton {
    right: 10px;
  }

  #settingsButton {
    right: 70px;
  }
}

.tool-container {
  background-color: var(--background-color);
  border-radius: 8px;
  padding: 1rem;
  margin-top: 1rem;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.tool-container h2 {
  margin-top: 0;
}

.tool-container input[type="file"],
.tool-container input[type="number"],
.tool-container input[type="range"] {
  margin-bottom: 1rem;
  width: 100%;
  padding: 0.5rem;
  border: 1px solid var(--secondary-color);
  border-radius: 4px;
  background-color: var(--background-color);
  color: var(--text-color);
  transition: background-color var(--transition-speed), color var(--transition-speed), border-color var(--transition-speed);
}

.tool-container .preview {
  max-width: 100%;
  margin-top: 1rem;
  border: 2px solid var(--secondary-color);
  border-radius: 8px;
  padding: 1rem;
  min-height: 200px;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: rgba(255, 255, 255, 0.05);
  transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.tool-container .preview img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  transition: box-shadow var(--transition-speed);
}