/* ============================================================
   文都网课平台 — 通用组件系统 (nc-components.css)
   版本: 2026-09-12 | 主理人: 齐活林 / 工程师: 寇豆码
   目的:
   1) 补齐此前因 bootstrap.min.css 缺失而无样式的组件
      (modal / card / badge / alert / btn-close)，使既有
      Bootstrap data-api 标记的弹窗/组件正常可用、美观。
   2) 提供统一的页面区块语言 (.nc-page-header / .nc-section)
      给各模块页面套用，形成一致的"重新设计"观感。
   全部基于现有 --nc-* 设计 token，不引入 Bootstrap CSS，
   避免与既有暖橙自定义设计冲突。
   ============================================================ */

/* ============================================================
   1. Modal（与 Bootstrap 5 JS 的 data-bs-toggle 完全兼容）
   ============================================================ */
.modal {
  position: fixed;
  top: 0; left: 0;
  z-index: 1060;
  width: 100%;
  height: 100%;
  overflow-x: hidden;
  overflow-y: auto;
  display: none;
  outline: 0;
}
.modal.show { display: flex !important; align-items: center; justify-content: center; padding: 1rem; }
.modal.fade { opacity: 0; transition: opacity var(--duration-fast) var(--easing-default); }
.modal.fade.show { opacity: 1; }

.modal-dialog {
  position: relative;
  width: 100%;
  max-width: 520px;
  margin: 0;
  pointer-events: none;
}
.modal.fade .modal-dialog { transform: translateY(-10px); transition: transform var(--duration-normal) var(--easing-default); }
.modal.show .modal-dialog { transform: none; pointer-events: auto; }
.modal-sm { max-width: 380px; }
.modal-lg { max-width: 720px; }
.modal-xl { max-width: 980px; }

.modal-content {
  position: relative;
  display: flex;
  flex-direction: column;
  width: 100%;
  background: var(--nc-bg-card);
  border: 1px solid var(--nc-border);
  border-radius: 16px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.28);
  outline: 0;
  overflow: hidden;
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem 1.35rem;
  border-bottom: 1px solid var(--nc-border);
}
.modal-title {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--nc-text-primary);
  line-height: 1.3;
}
.modal-body { position: relative; padding: 1.35rem; }
.modal-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 0.5rem;
  padding: 1rem 1.35rem;
  border-top: 1px solid var(--nc-border);
}
.modal-footer > * { margin: 0; }

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 1050;
  background: #000;
  opacity: 0.5;
}
.modal-backdrop.fade { opacity: 0; transition: opacity var(--duration-fast) linear; }
.modal-backdrop.show { opacity: 0.5; }

/* 关闭按钮（含 Bootstrap 的 .btn-close 与自定义 .nc-modal-close） */
.btn-close,
.nc-modal-close,
.nc-modal__close {
  box-sizing: content-box;
  width: 1.5rem; height: 1.5rem;
  padding: 0.25rem;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--nc-text-secondary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  line-height: 1;
  transition: background-color var(--duration-fast) var(--easing-default),
              color var(--duration-fast) var(--easing-default);
}
.btn-close::before,
.nc-modal-close::before,
.nc-modal__close::before { content: "\00d7"; }
.btn-close:hover,
.nc-modal-close:hover,
.nc-modal__close:hover { background: var(--nc-btn-ghost-hover); color: var(--nc-text-primary); }
.btn-close:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }

[data-theme="dark"] .modal-content { background: var(--nc-bg-card); border-color: var(--nc-border); }
[data-theme="dark"] .modal-header,
[data-theme="dark"] .modal-footer { border-color: var(--nc-border); }

/* ============================================================
   2. Card（轻量，兼容个别模板遗留 Bootstrap .card）
   ============================================================ */
.card {
  background: var(--nc-bg-card);
  border: 1px solid var(--nc-border);
  border-radius: var(--nc-radius);
  box-shadow: var(--nc-shadow-sm);
}
.card-header {
  padding: 0.85rem 1.15rem;
  border-bottom: 1px solid var(--nc-border);
  font-weight: 600;
  color: var(--nc-text-primary);
}
.card-body { padding: 1.15rem; }
.card-footer {
  padding: 0.85rem 1.15rem;
  border-top: 1px solid var(--nc-border);
}
[data-theme="dark"] .card { background: var(--nc-bg-card); border-color: var(--nc-border); }

/* ============================================================
   3. Badge / Alert（轻量兜底）
   ============================================================ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.2rem 0.55rem;
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1.2;
  border-radius: 999px;
  background: var(--nc-btn-ghost-hover);
  color: var(--nc-text-secondary);
}
.alert {
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
  padding: 0.85rem 1rem;
  border-radius: var(--nc-radius);
  border: 1px solid var(--nc-border);
  background: var(--nc-btn-ghost-hover);
  color: var(--nc-text-primary);
}
.alert--success { background: var(--nc-success-light); border-color: var(--nc-success); color: var(--nc-success); }
.alert--error, .alert--danger { background: var(--nc-danger-light); border-color: var(--nc-danger); color: var(--nc-danger); }
.alert--warning { background: var(--nc-warning-light); border-color: var(--nc-warning); color: #b45309; }

/* ============================================================
   4. 页面区块语言（重新设计统一观感）
   ============================================================ */

/* 页面级页头：图标 + 标题 + 副标题 + 右侧操作区 */
.nc-page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}
.nc-page-header__main { display: flex; align-items: center; gap: 0.75rem; min-width: 0; }
.nc-page-header__icon {
  flex-shrink: 0;
  width: 44px; height: 44px;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  border-radius: 12px;
  background: linear-gradient(135deg, #fb923c, var(--nc-btn-primary));
  color: #fff;
  box-shadow: 0 6px 16px rgba(var(--color-primary-rgb), 0.28);
}
.nc-page-header__titles { min-width: 0; }
.nc-page-header__title {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--nc-text-primary);
  line-height: 1.25;
  letter-spacing: -0.01em;
}
.nc-page-header__subtitle {
  margin: 0.2rem 0 0;
  font-size: 0.9rem;
  color: var(--nc-text-secondary);
}
.nc-page-header__actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* 内容区块卡片容器 */
.nc-section {
  background: var(--nc-bg-card);
  border: 1px solid var(--nc-border);
  border-radius: var(--nc-radius);
  box-shadow: var(--nc-shadow-sm);
  padding: 1.25rem 1.35rem;
  margin-bottom: 1.25rem;
}
.nc-section__title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 1rem;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--nc-text-primary);
}
.nc-section__title .bi { color: var(--nc-btn-primary); }
.nc-section__title-extra { margin-left: auto; display: flex; gap: 0.5rem; align-items: center; }

[data-theme="dark"] .nc-section { background: var(--nc-bg-card); border-color: var(--nc-border); }

/* 关怀：减少动态效果偏好 */
@media (prefers-reduced-motion: reduce) {
  .modal.fade, .modal.fade .modal-dialog { transition: none !important; }
}