/* ============================================================
 * 汉 · 页面结构组件 (Page Structure Components)
 * 中式面包屑、步骤条、时间线、树形目录等
 *
 * 使用方式：
 *   <nav class="han-breadcrumb">...</nav>
 *   <div class="han-steps">...</div>
 *   <div class="han-timeline">...</div>
 * ============================================================ */


/* ========================================================
 * 1. 中式面包屑 (Breadcrumb)
 * 水墨线条分隔的面包屑导航
 * ====================================================== */
.han-breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--han-space-2);
  padding: var(--han-space-3) var(--han-space-4);
  background: var(--han-color-bg-surface);
  border-radius: var(--han-radius-md);
  font-family: var(--han-font-kai);
  font-size: var(--han-fs-sm);
}

.han-breadcrumb__list {
  display: flex;
  align-items: center;
  gap: var(--han-space-2);
  list-style: none;
  padding: 0;
  margin: 0;
}

.han-breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: var(--han-space-2);
  color: var(--han-color-text-tertiary);
}

.han-breadcrumb__item a {
  color: var(--han-color-text-secondary);
  text-decoration: none;
  transition: color var(--han-duration-normal) var(--han-ease-out);
}

.han-breadcrumb__item a:hover {
  color: var(--han-color-accent-text);
}

.han-breadcrumb__item.is-current {
  color: var(--han-color-text-primary);
  font-weight: var(--han-fw-medium);
}

/* 分隔符 - 水墨点或回纹 */
.han-breadcrumb__separator {
  display: inline-block;
  width: 4px;
  height: 4px;
  background: var(--han-color-ink-300);
  border-radius: 50%;
}

/* 回纹分隔符 */
.han-breadcrumb__separator--huiwen {
  width: 16px;
  height: 12px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 12'%3E%3Cpath d='M2 6 L2 3 L5 3 L5 6 L3 6 L3 9 L7 9 L7 6' fill='none' stroke='%235e5a53' stroke-width='1'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-size: contain;
}


/* ========================================================
 * 2. 中式步骤条 (Steps)
 * 带印章节点的步骤指示器
 * ====================================================== */
.han-steps {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: var(--han-space-5) 0;
}

.han-steps__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 1;
  position: relative;
}

/* 步骤节点 */
.han-steps__node {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--han-color-bg-surface);
  border: var(--han-border-width) solid var(--han-color-border);
  border-radius: var(--han-radius-sm);
  font-family: var(--han-font-kai);
  font-size: var(--han-fs-sm);
  font-weight: var(--han-title-weight, var(--han-fw-bold));
  color: var(--han-color-text-tertiary);
  position: relative;
  z-index: 1;
  transition: all var(--han-duration-normal) var(--han-ease-out);
}

/* 当前步骤 */
.han-steps__item.is-active .han-steps__node {
  background: var(--han-color-accent-control);
  border-color: var(--han-color-accent-control);
  color: var(--han-color-on-accent);
  box-shadow: var(--han-shadow-seal);
  transform: scale(1.1);
}

/* 已完成步骤 */
.han-steps__item.is-completed .han-steps__node {
  background: var(--han-color-ink-700);
  border-color: var(--han-color-ink-700);
  color: var(--han-color-paper-100);
}

/* 步骤标题 */
.han-steps__title {
  margin-top: var(--han-space-3);
  font-family: var(--han-font-kai);
  font-size: var(--han-fs-sm);
  color: var(--han-color-text-tertiary);
  text-align: center;
  max-width: 100px;
  line-height: var(--han-lh-normal);
}

.han-steps__item.is-active .han-steps__title {
  color: var(--han-color-text-primary);
  font-weight: var(--han-fw-medium);
}

.han-steps__item.is-completed .han-steps__title {
  color: var(--han-color-text-secondary);
}

/* 连接线 */
.han-steps__connector {
  position: absolute;
  top: 16px;
  left: 50%;
  right: -50%;
  height: 2px;
  background: var(--han-color-border);
  z-index: 0;
}

.han-steps__item.is-completed .han-steps__connector {
  background: var(--han-color-ink-700);
}

.han-steps__item:last-child .han-steps__connector {
  display: none;
}


/* ========================================================
 * 3. 中式时间线 (Timeline)
 * 竖排时间线，带印章节点
 * ====================================================== */
.han-timeline {
  position: relative;
  padding: var(--han-space-5) 0;
}

.han-timeline::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(
    180deg,
    var(--han-color-ink-200) 0%,
    var(--han-color-ink-300) 50%,
    var(--han-color-ink-200) 100%
  );
}

.han-timeline__item {
  position: relative;
  padding-left: var(--han-space-7);
  padding-bottom: var(--han-space-7);
}

.han-timeline__item:last-child {
  padding-bottom: 0;
}

/* 时间线节点 */
.han-timeline__node {
  position: absolute;
  left: 8px;
  top: var(--han-space-2);
  width: 18px;
  height: 18px;
  background: var(--han-color-bg-surface);
  border: var(--han-border-width) solid var(--han-color-ink-400);
  border-radius: var(--han-radius-sm);
  z-index: 1;
}

/* 当前节点 */
.han-timeline__item.is-current .han-timeline__node {
  background: var(--han-color-accent-control);
  border-color: var(--han-color-accent-control);
  box-shadow: 0 0 0 4px var(--han-color-bg-elevated);
}

/* 已完成节点 */
.han-timeline__item.is-completed .han-timeline__node {
  background: var(--han-color-ink-700);
  border-color: var(--han-color-ink-700);
}

/* 时间标签 */
.han-timeline__date {
  display: inline-block;
  font-family: var(--han-font-kai);
  font-size: var(--han-fs-sm);
  color: var(--han-color-text-tertiary);
  margin-bottom: var(--han-space-1);
}

/* 时间标题 */
.han-timeline__title {
  font-family: var(--han-font-kai);
  font-size: var(--han-fs-lg);
  font-weight: var(--han-title-weight, var(--han-fw-bold));
  color: var(--han-color-text-primary);
  margin-bottom: var(--han-space-2);
}

/* 时间描述 */
.han-timeline__content {
  font-size: var(--han-fs-base);
  color: var(--han-color-text-secondary);
  line-height: var(--han-lh-relaxed);
}

/* 右侧时间线（反转） */
.han-timeline--right::before {
  left: auto;
  right: 16px;
}

.han-timeline--right .han-timeline__item {
  padding-left: 0;
  padding-right: var(--han-space-7);
  text-align: right;
}

.han-timeline--right .han-timeline__node {
  left: auto;
  right: 8px;
}


/* ========================================================
 * 4. 树形目录 (Tree)
 * 中式目录树，带展开/收起
 * ====================================================== */
.han-tree {
  list-style: none;
  padding: 0;
  margin: 0;
  font-family: var(--han-font-kai);
}

.han-tree__node {
  padding: var(--han-space-2) var(--han-space-3);
  border-radius: var(--han-radius-md);
  cursor: pointer;
  transition: background-color var(--han-duration-fast) var(--han-ease-out);
}

.han-tree__node:hover {
  background: var(--han-color-bg-elevated);
}

.han-tree__node.is-active {
  background: var(--han-color-bg-elevated);
  border-left: 3px solid var(--han-color-accent-control);
}

/* 节点内容 */
.han-tree__content {
  display: flex;
  align-items: center;
  gap: var(--han-space-2);
}

/* 展开箭头 */
.han-tree__arrow {
  width: 16px;
  height: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--han-duration-fast) var(--han-ease-out);
}

.han-tree__node.is-open > .han-tree__content .han-tree__arrow {
  transform: rotate(90deg);
}

/* 节点文字 */
.han-tree__text {
  flex: 1;
  font-size: var(--han-fs-sm);
  color: var(--han-color-text-secondary);
}

.han-tree__node.is-active > .han-tree__content .han-tree__text {
  color: var(--han-color-text-primary);
  font-weight: var(--han-fw-medium);
}

/* 子节点 */
.han-tree__children {
  list-style: none;
  padding-left: var(--han-space-5);
  margin-top: var(--han-space-1);
  border-left: var(--han-border-width) dashed var(--han-color-border);
  margin-left: var(--han-space-2);
}

.han-tree__children .han-tree__node {
  font-size: var(--han-fs-sm);
}

/* 叶子节点（不可展开） */
.han-tree__node.is-leaf > .han-tree__content .han-tree__arrow {
  visibility: hidden;
}


/* ========================================================
 * 5. 中式分页 (Pagination)
 * 印章风格的分页器（增强版）
 * ====================================================== */
.han-pagination-enhanced {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--han-space-2);
  padding: var(--han-space-5) 0;
}

.han-pagination-enhanced__info {
  font-family: var(--han-font-kai);
  font-size: var(--han-fs-sm);
  color: var(--han-color-text-tertiary);
  margin: 0 var(--han-space-4);
}

.han-pagination-enhanced__btn {
  min-width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 var(--han-space-3);
  font-family: var(--han-font-kai);
  font-size: var(--han-fs-sm);
  color: var(--han-color-text-secondary);
  background: var(--han-color-bg-surface);
  border: var(--han-border-width) solid var(--han-color-border);
  border-radius: var(--han-radius-sm);
  cursor: pointer;
  transition: all var(--han-duration-normal) var(--han-ease-out);
}

.han-pagination-enhanced__btn:hover:not(.is-disabled) {
  border-color: var(--han-color-accent-control);
  color: var(--han-color-accent-text);
}

.han-pagination-enhanced__btn.is-active {
  background: var(--han-color-accent-control);
  border-color: var(--han-color-accent-control);
  color: var(--han-color-on-accent);
  font-weight: var(--han-title-weight, var(--han-fw-bold));
  transform: rotate(-2deg);
  box-shadow: var(--han-shadow-seal);
}

.han-pagination-enhanced__btn.is-disabled {
  opacity: 0.4;
  cursor: not-allowed;
}


/* ========================================================
 * 6. 中式分割布局 (Split Layout)
 * 不等分页面布局
 * ====================================================== */

/* 左右分屏 */
.han-split-layout {
  display: grid;
  gap: var(--han-space-7);
  align-items: start;
}

/* 主要内容 2/3 + 次要 1/3 */
.han-split-layout--main {
  grid-template-columns: 2fr 1fr;
}

/* 主要内容 7/10 + 次要 3/10 */
.han-split-layout--painting {
  grid-template-columns: 7fr 3fr;
}

/* 主内容 + 侧边栏 */
.han-split-layout {
  grid-template-columns: 1fr 320px;
}

/* 侧边栏 */
.han-sidebar {
  position: sticky;
  top: calc(var(--han-nav-height) + var(--han-space-5));
}

.han-sidebar__card {
  background: var(--han-color-bg-surface);
  border: var(--han-border);
  border-radius: var(--han-radius-lg);
  padding: var(--han-space-5);
}

.han-sidebar__title {
  font-family: var(--han-font-kai);
  font-size: var(--han-fs-md);
  font-weight: var(--han-title-weight, var(--han-fw-bold));
  color: var(--han-color-text-primary);
  margin-bottom: var(--han-space-4);
  padding-bottom: var(--han-space-2);
  border-bottom: var(--han-border-width) solid var(--han-color-border);
}


/* ========================================================
 * 7. 响应式调整
 * ====================================================== */
@media (max-width: 768px) {
  .han-steps {
    flex-wrap: wrap;
    gap: var(--han-space-4);
  }

  .han-steps__item {
    flex: 0 0 calc(50% - var(--han-space-2));
  }

  .han-split-layout,
  .han-split-layout--main,
  .han-split-layout--painting {
    grid-template-columns: 1fr;
  }

  .han-timeline__item {
    padding-left: var(--han-space-6);
  }

  .han-sidebar {
    position: static;
  }
}

@media (max-width: 480px) {
  .han-steps__item {
    flex: 0 0 100%;
  }

  .han-steps__connector {
    display: none;
  }
}