:root {
  --background-color: #f8f9fa;
  --text-color: #212529;
  --primary-color: #007bff;
  --primary-text-color: #ffffff;
  --secondary-color: #6c757d;
  --border-color: #dee2e6;
  --surface-color: #ffffff;
  --shadow-color: rgba(0, 0, 0, 0.1);
  --font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-family);
  background-color: var(--background-color);
  color: var(--text-color);
  margin: 0;
  display: flex;
  justify-content: center;
  padding: 1rem;
}

main {
  width: 100%;
  max-width: 1000px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

header {
  text-align: center;
}

header h1 {
  margin: 0;
  font-size: 2rem;
  font-weight: 700;
}

header p {
  margin-top: 0.25rem;
  color: var(--secondary-color);
}

.toolbar {
  width: 100%;
  max-width: 600px;
  background-color: var(--surface-color);
  border-radius: 12px;
  padding: 1rem;
  box-shadow: 0 4px 15px var(--shadow-color);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  align-items: center;
}

.tool-group {
  display: flex;
  gap: 0.5rem;
}

.tool-settings {
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-grow: 1;
}

.setting {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.setting label {
  font-size: 0.9rem;
  color: var(--secondary-color);
}

.export-group {
  margin-left: auto;
}

button {
  font-family: var(--font-family);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.6rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background-color: var(--surface-color);
  color: var(--text-color);
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.1s ease;
}

button:hover {
  background-color: #e9ecef;
}

button:active {
  transform: scale(0.96);
}

.toolButton.active {
  background-color: var(--primary-color);
  color: var(--primary-text-color);
  border-color: var(--primary-color);
}

#copyBtn,
#downloadBtn {
  background-color: #28a745;
  color: white;
  border-color: #28a745;
}
#copyBtn:hover,
#downloadBtn:hover {
  background-color: #218838;
}

input[type="color"] {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  width: 32px;
  height: 32px;
  background-color: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
}
input[type="color"]::-webkit-color-swatch {
  border-radius: 8px;
  border: 1px solid var(--border-color);
}
input[type="color"]::-moz-color-swatch {
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

input[type="range"] {
  cursor: pointer;
}

#canvas-container {
  width: 100%;
  border: 2px dashed var(--border-color);
  border-radius: 12px;
  background-color: var(--surface-color);
  padding: 0.5rem;
}

#image-paste {
  display: block;
  width: 100%;
  height: auto;
  object-fit: contain;
}

@media (max-width: 650px) {
  .toolbar {
    flex-direction: column;
    align-items: stretch;
  }
  .export-group {
    margin-left: 0;
  }
}