:root {
  --sidebar-width: 250px;
  --primary: #1d2420;
  --primarybtn: #d8e5d9;
  /* 清新绿 */
  --primary-light: #eaf5ee;
  --primary-hover: #0c5e31;
  --bg-page: #f6f9f6;
  /* 浅绿灰底色 */
  --bg-card: #ffffff;
  --border-color: #d8e5d9;
  --text-main: #24292f;
  --text-muted: #57606a;
  --code-bg: #f8faf8;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-page);
  color: var(--text-main);
  display: flex;
  height: 100vh;
  overflow: hidden;
}

#app {
  display: flex;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

/* ===== 左侧树形侧边栏 (title_1 -> title_2) ===== */
.sidebar {
  width: var(--sidebar-width);
  background: #ffffff;
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.sidebar-header {
  padding: 16px 18px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sidebar-header h2 {
  font-size: 0.98rem;
  color: var(--primary);
  font-weight: 700;
}

.tree-list {
  list-style: none;
  overflow-y: auto;
  padding: 10px;
  flex-grow: 1;
}

/* 一级分类 (title_1) */
.group-item {
  margin-bottom: 6px;
}

.group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 0.88rem;
  font-weight: 700;
  color: #374151;
  cursor: pointer;
  user-select: none;
  transition: 0.15s;
}

.group-header:hover {
  background-color: var(--primary-light);
  color: var(--primary);
}

.group-arrow {
  font-size: 0.5rem;
  transition: transform 0.2s ease;
  color: var(--text-muted);
}

.group-arrow.open {
  transform: rotate(90deg);
}

/* 二级列表 (title_2) */
.sub-list {
  list-style: none;
  padding-left: 14px;
  margin-top: 3px;
}

.sub-item {
  padding: 8px 12px;
  margin-bottom: 2px;
  border-radius: 6px;
  font-size: 0.83rem;
  color: #4b5563;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  border-left: 2px solid transparent;
}

.sub-item:hover {
  background-color: var(--primary-light);
  color: var(--primary);
}

.sub-item.active {
  background-color: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
  border-left: 3px solid var(--primary);
}

.sidebar-footer {
  padding: 10px 14px;
  border-top: 1px solid var(--border-color);
  background: #fafdfa;
  display: flex;
  gap: 6px;
}

/* 按钮通用 */
.btn {
  font-size: 0.78rem;
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  border: 1px solid var(--border-color);
  background: #ffffff;
  color: var(--text-main);
  transition: 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.btn:hover {
  background: #f3f4f6;
}

.btn-primary {
  background: var(--primarybtn);
  color: #ffffff;
  border-color: var(--primarybtn);
}

.btn-primary:hover {
  background: var(--primary-hover);
}

/* ===== 右侧主展示区 ===== */
.main-container {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.top-bar {
  height: 56px;
  background: #ffffff;
  border-bottom: 1px solid var(--border-color);
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

.breadcrumb {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.breadcrumb span {
  color: var(--primary);
  font-weight: 600;
}

.top-bar-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.user-tag {
  font-size: 0.8rem;
  color: var(--primary);
  background: var(--primary-light);
  padding: 4px 10px;
  border-radius: 20px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 4px;
}

.content-scroll {
  flex-grow: 1;
  overflow-y: auto;
  padding: 30px 40px;
}

/* Markdown 博客样式排版 */
.markdown-body {
  /* max-width: 960px; */
  margin: 0 auto;
  background: var(--bg-card);
  padding: 22px 44px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  box-shadow: 0 1px 4px rgba(16, 124, 65, 0.03);
  line-height: 1.7;
}

.markdown-body h1 {
  font-size: 1.55rem;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--border-color);
  color: #111827;
}

.markdown-body h2 {
  font-size: 1.25rem;
  margin: 22px 0 14px 0;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border-color);
  color: var(--primary);
}

.markdown-body h3 {
  font-size: 1.05rem;
  margin: 20px 0 10px 0;
  color: #374151;
}

.markdown-body p {
  margin-bottom: 14px;
}

.markdown-body ul,
.markdown-body ol {
  padding-left: 24px;
  margin-bottom: 14px;
}

.markdown-body li {
  margin-bottom: 4px;
}

.markdown-body blockquote {
  border-left: 4px solid var(--primary);
  background: var(--primary-light);
  padding: 10px 16px;
  margin: 14px 0;
  color: #1e3a29;
  border-radius: 0 6px 6px 0;
}

.markdown-body pre {
  background: var(--code-bg) !important;
  border: 1px solid #e1ebe2;
  border-radius: 8px;
  padding: 14px;
  margin: 14px 0 18px 0;
  font-size: 0.86rem;
  overflow-x: auto;
}

.markdown-body code {
  font-family: Consolas, Monaco, "Courier New", monospace;
  background: #edf4ee;
  color: #0f5c2e;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.86rem;
}

.markdown-body pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

/* 编辑器样式 */
.editor-container {
  /* max-width: 960px; */
  margin: 0 auto;
  background: #ffffff;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  padding: 24px;
}

.form-group {
  margin-bottom: 14px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 4px;
  color: #374151;
}

.form-control {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-family: inherit;
  font-size: 0.88rem;
}

textarea.form-control {
  height: 480px;
  font-family: Consolas, Monaco, monospace;
  font-size: 0.88rem;
  line-height: 1.5;
  resize: vertical;
  background: #fafdfa;
}

/* ===== 登录弹窗 (Modal) ===== */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(2px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.login-box {
  background: #ffffff;
  width: 360px;
  padding: 28px 24px;
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.12);
  border: 1px solid var(--border-color);
}

.login-box h3 {
  font-size: 1.15rem;
  color: var(--primary);
  text-align: center;
  margin-bottom: 20px;
}

.login-input {
  margin-bottom: 14px;
}

.login-input label {
  display: block;
  font-size: 0.82rem;
  color: #4b5563;
  margin-bottom: 4px;
}

.login-input input {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 0.9rem;
}