/* layout.css - 主布局:侧边栏、顶栏、消息区
 * 与原 index.html 内联样式保持完全一致
 */

/* 整体布局 */
.app-shell { height: 100vh; display: flex; }
#sidebar {
  width: 100%; background: var(--chat-panel); border-right: 1px solid var(--chat-border);
  display: flex; flex-direction: column; flex-shrink: 0;
  position: relative;  /* 作为拖拽手柄 absolute 定位的参照 */
}
#sidebar header { padding: 14px; border-bottom: 1px solid var(--chat-border); }
#sidebar h1 { font-size: 15px; font-weight: 600; }
#sessionList { flex: 1; overflow-y: auto; padding: 8px; }
.session-item { padding: 10px; border-radius: 8px; cursor: pointer; margin-bottom: 4px;
                display: flex; justify-content: space-between; align-items: center; gap: 6px; }
.session-item:hover { background: var(--bs-secondary-bg); }
.session-item.active { background: var(--active-bg); color: var(--active-fg, var(--bs-body-color)); }
.session-item .title { font-size: 13px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; }
.session-item .del { color: var(--bs-secondary-color); font-size: 14px; opacity: 0; transition: opacity .15s; }
.session-item:hover .del { opacity: 1; }
.session-item .del:hover { color: #ff6b6b; }

/* 主区域 */
#main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
#topbar {
  padding: 10px 18px;
  background: var(--chat-panel);
  border-bottom: 1px solid var(--chat-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
  gap: 12px;
  flex-wrap: nowrap;
}
/* topbar 左侧:模型选择 + 主题按钮 */
#topbar > .topbar-left {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 0;
}
#topbar > .topbar-left .form-select {
  max-width: 320px;
  min-width: 180px;
}
/* topbar 右侧:用户信息 + 操作按钮组 */
#topbar > .topbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
/* 用户信息区:邮箱 + 状态 */
.user-info {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-right: 10px;
  border-right: 1px solid var(--bs-border-color);
  margin-right: 2px;
}
.user-info #userEmail {
  font-size: 12.5px;
  color: var(--bs-secondary-color);
  max-width: 160px;
}
.user-info #status {
  font-size: 11px;
  white-space: nowrap;
}
/* 操作按钮统一样式 */
.topbar-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  border: 1px solid var(--bs-border-color);
  color: var(--bs-body-color);
  background: transparent;
  border-radius: 8px;
  padding: 5px 12px;
  font-size: 12.5px;
  cursor: pointer;
  transition: all .15s ease;
  white-space: nowrap;
}
.topbar-btn:hover {
  background: var(--bs-secondary-bg);
  border-color: var(--bs-secondary-color);
}
/* 主题选择下拉框 */
#themeSelect {
  max-width: 150px;
  font-size: 12.5px;
}

/* 头像下拉(移动端专用) */
.user-wrap { position: relative; }
.user-info-caret {
  font-size: 11px;
  color: var(--bs-secondary-color);
  margin-left: 2px;
  transition: transform .15s ease;
}
.user-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: max-content;
  max-width: calc(100vw - 24px);
  min-width: 232px;
  background: var(--bs-body-bg);
  border: 1px solid var(--bs-border-color);
  border-radius: 14px;
  box-shadow: 0 12px 32px rgba(0, 0, 0, .18), 0 2px 8px rgba(0, 0, 0, .10);
  padding: 8px;
  z-index: 1050;
  display: flex;
  flex-direction: column;
  gap: 2px;
  /* 展开动画:默认收起 */
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px) scale(.97);
  transform-origin: top right;
  transition: opacity .16s ease, transform .16s ease, visibility .16s ease;
}
.user-menu.is-open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}
/* 下拉顶部小三角,指向头像(双层描边更精致) */
.user-menu::before {
  content: "";
  position: absolute;
  top: -7px;
  right: 16px;
  width: 12px;
  height: 12px;
  background: var(--bs-body-bg);
  border-left: 1px solid var(--bs-border-color);
  border-top: 1px solid var(--bs-border-color);
  border-top-left-radius: 3px;
  transform: rotate(45deg);
}
/* 账户头部 */
.user-menu-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px 12px;
  margin-bottom: 4px;
  border-bottom: 1px solid var(--bs-border-color);
}
.user-menu-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--bs-tertiary-bg);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  overflow: hidden;
  flex-shrink: 0;
}
.user-menu-avatar img { width: 100%; height: 100%; object-fit: cover; }
.user-menu-id { display: flex; flex-direction: column; min-width: 0; }
.user-menu-name {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--bs-body-color);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.user-menu-email {
  font-size: 11.5px;
  color: var(--bs-secondary-color);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.user-menu-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 12px;
  background: transparent;
  border: 0;
  border-radius: 9px;
  color: var(--bs-body-color);
  font-size: 13.5px;
  text-align: left;
  cursor: pointer;
  transition: background .14s ease, color .14s ease;
}
.user-menu-item:hover,
.user-menu-item:focus-visible { background: var(--bs-secondary-bg); outline: none; }
.user-menu-item .umi-icon {
  display: inline-flex;
  width: 18px;
  justify-content: center;
  font-size: 15px;
  flex-shrink: 0;
}
.user-menu-danger { color: var(--bs-danger, #e5484d); }
.user-menu-danger:hover,
.user-menu-danger:focus-visible { background: color-mix(in srgb, var(--bs-danger, #e5484d) 14%, transparent); }
.user-menu-divider {
  height: 1px;
  background: var(--bs-border-color);
  margin: 6px 4px;
}
.user-menu-label {
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--bs-secondary-color);
  padding: 8px 12px 3px;
}
.user-menu .form-select { margin: 0 4px 6px; }
.user-menu .form-select:focus { box-shadow: 0 0 0 .2rem color-mix(in srgb, var(--bs-primary) 25%, transparent); }

/* ============================================================
   侧边栏:拖拽改宽 + 折叠(仅 PC 端生效,移动端走 offcanvas 抽屉)
   - 宽度用独立变量 --sb-width,不污染 Bootstrap 抽屉的 --bs-offcanvas-width
   - 折叠时把 #sidebarCanvas 压到 0,flex 自动让 #main 占满
   ============================================================ */
.sidebar-resizer {
  position: absolute;
  top: 0;
  right: 0;              /* 贴右边缘,避免伸出导致横向溢出 */
  width: 6px;
  height: 100%;
  cursor: col-resize;
  z-index: 6;
  border-radius: 3px;
  transition: background .15s ease;
}
.sidebar-resizer:hover,
.sidebar-resizer:active {
  background: color-mix(in srgb, var(--bs-primary) 45%, transparent);
}
/* 拖拽进行中:全局锁定光标、禁止选中文本 */
body.resizing { cursor: col-resize !important; user-select: none !important; }

/* PC 端宽度的真实控制点:覆盖 Bootstrap .offcanvas-lg 的默认 width */
@media (min-width: 992px) {
  .offcanvas-lg {
    width: var(--sb-width, 260px) !important;
  }
  /* 折叠态:宽度归零 + 隐藏内容(移动端的 .sidebar-collapsed 不在此媒体查询,不影响抽屉) */
  .sidebar-collapsed #sidebarCanvas {
    width: 0 !important;
    min-width: 0;
    border-right: none;
    overflow: hidden;
    transform: none !important;
  }
}