:root {
  --color-bg: #0a0a0a;
  --color-surface: #1a1a1a;
  --color-primary: #00ff99;
  --color-primary-hover: #00cc7a;
  --color-text: #ffffff;
  --color-text-dim: #b0b0b0;
  --color-error: #ff0033;
}

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

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

h1, h2, h3 {
  color: var(--color-primary);
  margin-bottom: 1rem;
}

button {
  background: transparent;
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  padding: 0.5rem 1rem;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
  font-weight: 600;
}

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

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

input, textarea {
  background: var(--color-surface);
  border: 1px solid #333;
  color: white;
  padding: 0.5rem;
  border-radius: 4px;
  outline: none;
}

input:focus, textarea:focus {
  border-color: var(--color-primary);
}