/**
 * Button Components
 * 共通ボタンスタイル
 */

/* Base Button */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.625rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  gap: 0.5rem;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Primary Button */
.btn-primary {
  background: var(--color-primary);
  color: white;
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-dark);
}

/* Secondary Button */
.btn-secondary {
  background: white;
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--color-bg-alt);
}

/* Outline Button */
.btn-outline {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.btn-outline:hover:not(:disabled) {
  background: var(--color-bg-alt);
  border-color: var(--color-text-light);
}

/* Size Variants */
.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.75rem;
}

.btn-lg {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
}

.btn-large {
  padding: 1rem 2rem;
  font-size: 1rem;
  border-radius: var(--radius-lg);
  background: var(--color-primary);
  color: white;
}

.btn-large:hover:not(:disabled) {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-block {
  width: 100%;
}

/* Button with Icon */
.btn svg {
  flex-shrink: 0;
}

/* Loading State */
.btn-text,
.btn-loader {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-loader.hidden {
  display: none;
}

.btn-loading {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

/* Spinner Animation */
.spinner {
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Social Buttons */
.btn-social {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  width: 100%;
  padding: 0.75rem 1rem;
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  color: var(--color-text);
  cursor: pointer;
  transition: var(--transition);
}

.btn-social:hover {
  background: var(--color-bg-alt);
  border-color: var(--color-text-light);
}

.btn-social svg {
  width: 20px;
  height: 20px;
}