@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Noto+Sans+SC:wght@400;500;700&display=swap');

:root {
  --font-sans: 'Inter', 'Noto Sans SC', sans-serif;
  --background: #f8f9fa;
  --surface: #ffffff;
  --primary: #007bff;
  --primary-hover: #0056b3;
  --text-primary: #212529;
  --text-secondary: #6c757d;
  --border-color: #dee2e6;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  --radius: 8px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--background);
  color: var(--text-primary);
  margin: 0;
  padding: 24px;
  display: flex;
  justify-content: center;
  min-height: 100vh;
  box-sizing: border-box;
}

.container {
  width: 100%;
  max-width: 960px;
  background-color: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px;
  box-sizing: border-box;
}

header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 24px;
  margin-bottom: 24px;
}

header h1 {
  font-size: 28px;
  font-weight: 600;
  margin: 0;
}

header p {
  font-size: 16px;
  color: var(--text-secondary);
  margin: 8px 0 0;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.tool-card {
  background-color: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 24px;
  text-decoration: none;
  color: var(--text-primary);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 12px rgba(0, 0, 0, 0.08);
}

.tool-card h2 {
  font-size: 20px;
  font-weight: 600;
  margin: 0 0 8px;
  color: var(--primary);
}

.tool-card p {
  font-size: 14px;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.5;
}

.tool-container {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 32px;
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.control-group label {
  font-weight: 500;
  font-size: 14px;
}

.preview-area {
  background-color: #f1f3f5;
  border: 2px dashed var(--border-color);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  position: relative;
  overflow: hidden;
}

.preview-area canvas {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  image-rendering: pixelated;
}

.placeholder-text {
  color: var(--text-secondary);
  text-align: center;
}

.btn {
  display: inline-block;
  padding: 12px 20px;
  font-size: 16px;
  font-weight: 500;
  text-align: center;
  text-decoration: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease;
  border: none;
}

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

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

.btn-secondary {
  background-color: var(--surface);
  color: var(--primary);
  border: 1px solid var(--primary);
}

.btn-secondary:hover {
  background-color: #e9ecef;
}

.file-input-wrapper {
  position: relative;
  overflow: hidden;
  display: inline-block;
}

.file-input-wrapper input[type='file'] {
  position: absolute;
  left: 0;
  top: 0;
  opacity: 0;
  width: 100%;
  height: 100%;
  cursor: pointer;
}

.size-options {
  display: flex;
  gap: 8px;
}

.size-options .btn {
  flex-grow: 1;
  padding: 8px 12px;
  font-size: 14px;
}

.custom-size {
  display: flex;
  align-items: center;
  gap: 8px;
}

.custom-size input {
  width: 60px;
  padding: 8px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  text-align: center;
}

.switch-container {
  display: flex;
  align-items: center;
  gap: 12px;
}

.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  transition: 0.4s;
  border-radius: 24px;
}

.slider:before {
  position: absolute;
  content: '';
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: 0.4s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--primary);
}

input:checked + .slider:before {
  transform: translateX(20px);
}

.output-actions {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}