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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.signin-container {
  background: white;
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
  padding: 40px;
  max-width: 400px;
  width: 100%;
  text-align: center;
}

.signin-container h1 {
  color: #333;
  margin-bottom: 10px;
  font-size: 28px;
  font-weight: 600;
}

.signin-container p {
  color: #666;
  margin-bottom: 30px;
  font-size: 14px;
}

.error-message {
  background: #fee;
  color: #c33;
  padding: 12px;
  border-radius: 6px;
  margin-bottom: 20px;
  font-size: 14px;
  display: none;
}

.error-message.show {
  display: block;
}

.signin-button {
  background: #4285f4;
  color: white;
  border: none;
  padding: 12px 24px;
  border-radius: 6px;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  transition: background 0.2s;
}

.signin-button:hover {
  background: #357ae8;
}

.signin-button:disabled {
  background: #ccc;
  cursor: not-allowed;
}

.google-icon {
  width: 20px;
  height: 20px;
}

.loading {
  display: none;
  margin-top: 20px;
  color: #666;
}

.loading.show {
  display: block;
}