:root {
  --primary-color: #39de00;
  --bg-dark: #0a0a0a;
  --bg-card: #1a1a1a;
  --bg-hover: #252525;
  --text-primary: #ffffff;
  --text-secondary: #a0a0a0;
  --border-color: #2a2a2a;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 40px 20px;
}

header {
  text-align: center;
  margin-bottom: 60px;
  padding-top: 40px;
}

header h1 {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 10px;
  background: linear-gradient(135deg, var(--primary-color), #2ab300);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

.github-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 20px;
  padding: 8px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: all 0.3s ease;
}

.github-badge:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
  transform: translateY(-2px);
}

.category {
  margin-bottom: 60px;
}

.category h2 {
  font-size: 1.8rem;
  margin-bottom: 24px;
  padding-left: 16px;
  border-left: 4px solid var(--primary-color);
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 28px;
  transition: all 0.3s ease;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  display: block;
}

.tool-card:hover {
  border-color: var(--primary-color);
  background: var(--bg-hover);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(57, 222, 0, 0.15);
}

.tool-card h3 {
  font-size: 1.3rem;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.tool-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.5;
}

.tool-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary-color), #2ab300);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 24px;
}

.btn-primary {
  background: var(--primary-color);
  color: var(--bg-dark);
  border: none;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-primary:hover {
  background: #2ab300;
  transform: scale(1.05);
  box-shadow: 0 4px 16px rgba(57, 222, 0, 0.3);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

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

.tool-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 20px;
}

.tool-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 40px;
}

.tool-header h1 {
  font-size: 2.5rem;
}

.back-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 1rem;
  transition: color 0.3s ease;
}

.back-link:hover {
  color: var(--primary-color);
}

.tool-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 32px;
  margin-bottom: 24px;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 24px;
}

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

.control-group label {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
}

input[type="text"],
input[type="number"],
input[type="file"],
select,
textarea {
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 0.95rem;
  transition: border-color 0.3s ease;
}

input[type="text"]:focus,
input[type="number"]:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary-color);
}

textarea {
  resize: vertical;
  min-height: 120px;
  font-family: 'Courier New', monospace;
}

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 52px;
  height: 28px;
}

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

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg-dark);
  border: 1px solid var(--border-color);
  transition: 0.3s;
  border-radius: 28px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 3px;
  bottom: 3px;
  background-color: var(--text-secondary);
  transition: 0.3s;
  border-radius: 50%;
}

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

input:checked + .slider:before {
  transform: translateX(24px);
  background-color: var(--bg-dark);
}

canvas {
  max-width: 100%;
  border-radius: 8px;
  background: var(--bg-dark);
}

.error-container {
  text-align: center;
  padding: 100px 20px;
}

.error-container h1 {
  font-size: 8rem;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--primary-color), #2ab300);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.error-container h2 {
  font-size: 2rem;
  margin-bottom: 16px;
}

.error-container p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 32px;
}

@media (max-width: 768px) {
  header h1 {
    font-size: 2rem;
  }
  
  .tools-grid {
    grid-template-columns: 1fr;
  }
  
  .tool-header {
    flex-direction: column;
    gap: 20px;
    text-align: center;
  }
  
  .controls {
    flex-direction: column;
  }
}