/* ============================================================
   button.css - primary upscale CTA + inline spinner
   ============================================================ */

.upscale-btn {
  width: 100%;
  padding: 15px;
  border: 1px solid var(--button-border);
  border-radius: var(--radius-lg);
  background: var(--button-bg);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  letter-spacing: 0;
  transition: all 0.22s var(--ease-out);
  margin-bottom: 14px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--button-shadow);
  outline: none;
}

/* glass top-edge highlight */
.upscale-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(255,255,255,0.1) 0%, transparent 55%);
}

.upscale-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  background: var(--button-bg-hover);
  box-shadow: var(--button-shadow-hover);
}

.upscale-btn:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: var(--button-shadow);
}

.upscale-btn:focus-visible {
  box-shadow: var(--button-shadow), var(--button-focus);
}

.upscale-btn:disabled {
  opacity: 0.32;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
  border-color: transparent;
}

.upscale-btn.is-loading:disabled {
  opacity: 1;
  cursor: wait;
  box-shadow: var(--button-shadow);
  border-color: var(--button-border);
}

/* inner flex row (spinner + label) */
.btn-content {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  position: relative;
  z-index: 1;
}

/* CSS spinner shown while submitting */
.btn-spinner {
  width: 15px;
  height: 15px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: none;
  flex-shrink: 0;
}

.btn-spinner.show { display: block; }