/* ========== modal.css：模态框 ========== */
body.modal-open {
  overflow: hidden;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
  background-color: var(--color-overlay);
  backdrop-filter: blur(4px);
  opacity: 0;
  transition: opacity var(--duration-base) var(--ease-out);
}
.modal-overlay.is-visible { opacity: 1; }

.modal {
  width: 100%;
  max-width: 560px;
  max-height: calc(100vh - 2 * var(--spacing-xl));
  display: flex;
  flex-direction: column;
  background-color: var(--color-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  transform: translateY(20px) scale(0.96);
  transition: transform var(--duration-base) var(--ease-spring);
}
.modal-overlay.is-visible .modal {
  transform: translateY(0) scale(1);
}

.modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg) var(--spacing-xl);
  border-bottom: 1px solid var(--color-border);
}
.modal__title {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
}
.modal__close {
  width: 40px;
  height: 40px;
  font-size: 28px;
  line-height: 1;
  color: var(--color-text-tertiary);
  border-radius: var(--radius-sm);
  transition: color var(--duration-fast), background-color var(--duration-fast);
}
.modal__close:hover {
  color: var(--color-text);
  background-color: var(--color-bg-soft);
}

.modal__body {
  padding: var(--spacing-xl);
  overflow-y: auto;
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text-secondary);
}

.modal__footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-md);
  padding: var(--spacing-lg) var(--spacing-xl);
  border-top: 1px solid var(--color-border);
}