:root {
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --accent: #38bdf8;
  --accent-hover: #0284c7;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
}

header {
  text-align: center;
  margin-top: 2rem;
}

header h1 {
  color: var(--accent);
  margin-bottom: 0.5rem;
}

header p {
  color: var(--text-muted);
}

.container {
  width: 90%;
  max-width: 600px;
  margin: 2rem 0;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.card {
  background-color: var(--card-bg);
  padding: 1.5rem;
  border-radius: 12px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
}

.button-group {
  display: flex;
  gap: 10px;
  margin-top: 1rem;
}

button {
  flex: 1;
  padding: 10px;
  border: none;
  border-radius: 6px;
  background-color: #334155;
  color: var(--text-main);
  font-weight: bold;
  cursor: pointer;
  transition: background 0.2s ease;
}

button:hover {
  background-color: var(--accent);
  color: #000;
}

.btn-primary {
  background-color: var(--accent);
  color: #0f172a;
  width: 100%;
  margin-top: 1rem;
}

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