.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  font-family: var(--font-body);
  letter-spacing: 0.01em;
  text-decoration: none;
  border-radius: var(--radius-lg);
  border: 2px solid transparent;
  cursor: pointer;
  transition:
    background-color 0.2s ease,
    color 0.2s ease,
    transform 0.2s var(--ease-spring),
    box-shadow 0.2s ease,
    border-color 0.2s ease;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  user-select: none;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(45deg, transparent 30%, rgb(255 255 255 / 30%) 50%, transparent 70%);
  transform: translateX(-100%);
  transition: transform var(--transition-slow);
}

.btn:hover::before {
  transform: translateX(100%);
}

.btn--primary {
  background: linear-gradient(135deg, var(--primary-500, #00a35c), var(--primary-700, #007a44));
  color: #ffffff;
  box-shadow: var(--shadow-primary, 0 4px 14px rgb(0 163 92 / 40%));
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn--primary:active {
  transform: translateY(0) scale(0.98);
  box-shadow: var(--shadow-primary);
  transition-duration: 0.08s;
}

.btn--accent {
  background: linear-gradient(135deg, var(--accent-500, #c9a227), var(--accent-600, #b08d1f));
  color: #ffffff;
  box-shadow: var(--shadow-accent, 0 4px 14px rgb(201 162 39 / 40%));
}

.btn--accent:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn--accent:active {
  transform: translateY(0) scale(0.98);
  transition-duration: 0.08s;
}

.btn--ghost {
  background: transparent;
  color: #ffffff;
  border-color: rgb(255 255 255 / 60%);
}

.btn--ghost:hover {
  background: rgb(255 255 255 / 12%);
  border-color: rgb(255 255 255 / 85%);
}

.btn--ghost:active {
  background: rgb(255 255 255 / 18%);
  transform: scale(0.98);
  transition-duration: 0.08s;
}

.btn--sm {
  padding: 0.5rem 1.125rem;
  font-size: 0.875rem;
  min-height: 2.75rem;
  border-radius: var(--radius-md, 8px);
}

.btn--lg {
  padding: 1rem 2rem;
  font-size: 1.125rem;
}

/* Universal focus ring */
.btn:focus-visible {
  outline: 2px solid #ffffff;
  outline-offset: 3px;
  box-shadow: 0 0 0 5px rgb(0 163 92 / 35%);
}