/* ============================================================
   layout.css —— 应用骨架布局
   顶栏 / 目录栏 / 分隔线 / 工作区 / 状态栏
   ============================================================ */

.app {
  display: grid;
  grid-template-rows: var(--h-topbar) 1fr var(--h-statusbar);
  height: 100vh;
  overflow: hidden;
  padding-left: var(--w-menubar);
  transition: padding-left .28s var(--ease);
}
.app.rail-expanded { --w-menubar: var(--w-menubar-expanded); }

/* ==================== 左侧图标导航栏 ==================== */
.menubar {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--w-menubar);
  display: flex;
  flex-direction: column;
  align-items: stretch;
  background: var(--c-rail-bg);
  z-index: 70;
  overflow: hidden;
  transition: width .28s var(--ease);
}

.rail-brand,
.rail-item,
.rail-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 0;
  white-space: nowrap;
  flex: none;
  color: var(--c-rail-text);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}
.app.rail-expanded .rail-brand,
.app.rail-expanded .rail-item,
.app.rail-expanded .rail-toggle {
  justify-content: flex-start;
  padding: 0 18px;
}

.rail-brand {
  height: var(--h-topbar);
  color: var(--c-rail-brand);
  border-bottom: 1px solid var(--c-rail-border);
}
.rail-brand svg { flex: none; }
.rail-brand-text {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .2px;
  color: var(--c-rail-brand);
}

.rail-item { height: 46px; }
.rail-item svg { flex: none; }
.rail-item:hover { background: var(--c-rail-bg-hover); color: #fff; }
.rail-item.active { background: var(--c-rail-bg-active); color: #fff; }
.rail-label { font-size: 12.5px; }

.rail-nav {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  align-items: stretch;
}
.rail-nav::-webkit-scrollbar { width: 0; }

.rail-toggle {
  height: 41px;
  color: var(--c-rail-text-dim);
  border-top: 1px solid var(--c-rail-border);
}
.rail-toggle:hover { background: var(--c-rail-bg-hover); color: var(--c-rail-text); }
.rail-toggle svg { flex: none; transition: transform .28s var(--ease); }
.app.rail-expanded .rail-toggle svg { transform: scaleX(-1); }

/* 折叠态隐藏文字标签 */
.rail-label,
.rail-brand-text { display: none; }
.app.rail-expanded .rail-label,
.app.rail-expanded .rail-brand-text { display: inline; }

/* ==================== 顶栏 ==================== */
.topbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 10px;
  background: var(--c-bg-elev);
  border-bottom: 1px solid var(--c-border);
  z-index: 60;
  -webkit-app-region: drag;
}
.topbar > * { -webkit-app-region: no-drag; }
.topbar-toggle { margin-right: -2px; }
.topbar-spacer { flex: 1; }

.brand {
  display: flex;
  align-items: center;
  gap: 7px;
  padding-right: 12px;
  margin-right: 2px;
  border-right: 1px solid var(--c-border);
  user-select: none;
}
.brand-mark { color: var(--c-accent); display: flex; }
.brand-text {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .2px;
  white-space: nowrap;
}

/* ---- 菜单栏 ---- */
.menu { display: flex; align-items: center; gap: 1px; }
.menu-item {
  position: relative;
  height: 30px;
  padding: 0 11px;
  border-radius: var(--r-md);
  font-size: 12.5px;
  color: var(--c-text-2);
  display: flex;
  align-items: center;
  gap: 5px;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
  white-space: nowrap;
}
.menu-item:hover, .menu-item.open { background: var(--c-bg-hover); color: var(--c-text); }
.menu-item.open { background: var(--c-bg-active); }
.menu-item .chev { opacity: .45; transition: transform var(--dur) var(--ease); }
.menu-item.open .chev { transform: rotate(180deg); }

/* ---- 顶栏右侧 ---- */
.topbar-right { display: flex; align-items: center; gap: 2px; }
.user-btn {
  display: flex;
  align-items: center;
  gap: 7px;
  height: 30px;
  padding: 0 9px 0 5px;
  margin-left: 5px;
  border-radius: 999px;
  transition: background var(--dur) var(--ease);
}
.user-btn:hover { background: var(--c-bg-hover); }
.avatar {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--c-accent), #5ac8fa);
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  flex: none;
}
.user-name { font-size: 12.5px; color: var(--c-text-2); max-width: 108px; overflow: hidden;
  text-overflow: ellipsis; white-space: nowrap; }

/* ==================== 主体 ==================== */
.body {
  display: flex;
  min-height: 0;
  overflow: hidden;
  position: relative;
}

/* ---- 目录栏 ---- */
.sidebar {
  width: var(--w-sidebar);
  flex: none;
  display: flex;
  flex-direction: column;
  background: var(--c-bg-elev);
  border-right: 1px solid var(--c-border);
  min-width: 0;
  overflow: hidden;
}
.app.no-sidebar .sidebar { display: none; }
.app.no-sidebar .splitter { display: none; }

.sidebar-head {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 8px 8px 8px 10px;
  border-bottom: 1px solid var(--c-border);
  flex: none;
}
.search-box {
  position: relative;
  flex: 1;
  display: flex;
  align-items: center;
  min-width: 0;
}
.search-box > svg {
  position: absolute;
  left: 8px;
  color: var(--c-text-3);
  pointer-events: none;
}
.search-box input {
  height: 27px;
  padding-left: 26px;
  padding-right: 22px;
  font-size: 12px;
  background: var(--c-bg-sunken);
  border-color: transparent;
}
.search-box input:focus { background: var(--c-bg-elev); border-color: var(--c-accent); }
.search-clear {
  position: absolute;
  right: 5px;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  color: var(--c-text-3);
  font-size: 15px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}
.search-clear:hover { background: var(--c-bg-hover); color: var(--c-text); }

.tree-wrap {
  flex: 1;
  overflow: auto;
  padding: 6px 6px 20px;
  min-height: 0;
}
.tree-empty {
  padding: 34px 16px;
  text-align: center;
  font-size: 12px;
  color: var(--c-text-3);
  line-height: 1.7;
}

/* ---- 分隔线 ---- */
.splitter {
  width: 5px;
  flex: none;
  cursor: col-resize;
  position: relative;
  z-index: 20;
  background: transparent;
  transition: background var(--dur) var(--ease);
}
.splitter::after {
  content: '';
  position: absolute;
  left: 2px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--c-border);
  transition: background var(--dur) var(--ease), width var(--dur) var(--ease), left var(--dur) var(--ease);
}
.splitter:hover::after, .splitter.dragging::after {
  left: 1px;
  width: 3px;
  background: var(--c-accent);
}
body.resizing { cursor: col-resize; user-select: none; }
body.resizing iframe { pointer-events: none; }

/* ---- 工作区 ---- */
.workspace {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  background: var(--c-bg);
  overflow: hidden;
  position: relative;
}

/* 标签栏 */
.tabs-bar {
  display: flex;
  align-items: stretch;
  height: var(--h-tabs);
  flex: none;
  background: var(--c-bg-elev);
  border-bottom: 1px solid var(--c-border);
  overflow: hidden;
}
.tabs-bar.empty { display: none; }
.tabs {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  padding: 0 6px;
  overflow-x: auto;
  overflow-y: hidden;
  flex: 1;
  min-width: 0;
  scrollbar-width: none;
}
.tabs::-webkit-scrollbar { height: 0; }

.tab {
  display: flex;
  align-items: center;
  gap: 6px;
  height: calc(var(--h-tabs) - 6px);
  padding: 0 9px 0 11px;
  margin-bottom: 0;
  border-radius: var(--r-md) var(--r-md) 0 0;
  font-size: 12.5px;
  color: var(--c-text-2);
  cursor: pointer;
  position: relative;
  max-width: 190px;
  min-width: 0;
  user-select: none;
  border: 1px solid transparent;
  border-bottom: none;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
  flex: none;
}
.tab:hover { background: var(--c-bg-hover); color: var(--c-text); }
.tab.active {
  background: var(--c-bg);
  color: var(--c-text);
  border-color: var(--c-border);
  font-weight: 500;
}
.tab.active::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 1px;
  background: var(--c-bg);
}
.tab.dragging { opacity: .45; }
.tab.drop-before { box-shadow: inset 2px 0 0 var(--c-accent); }
.tab.drop-after { box-shadow: inset -2px 0 0 var(--c-accent); }

.tab-icon { flex: none; display: flex; color: var(--c-text-3); }
.tab.active .tab-icon { color: var(--c-accent); }
.tab-label {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}
.tab-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--c-accent); flex: none;
}
.tab-close {
  width: 16px; height: 16px;
  border-radius: 4px;
  display: flex; align-items: center; justify-content: center;
  color: var(--c-text-3);
  flex: none;
  opacity: 0;
  transition: opacity var(--dur) var(--ease), background var(--dur) var(--ease);
  font-size: 14px;
  line-height: 1;
}
.tab:hover .tab-close, .tab.active .tab-close { opacity: 1; }
.tab-close:hover { background: var(--c-bg-active); color: var(--c-text); }

.tabs-actions {
  display: flex;
  align-items: center;
  padding: 0 7px;
  gap: 2px;
  border-left: 1px solid var(--c-border);
  flex: none;
}

/* 编辑器容器 */
.editors {
  flex: 1;
  position: relative;
  min-height: 0;
  overflow: hidden;
}
.editor-pane {
  position: absolute;
  inset: 0;
  display: none;
  flex-direction: column;
  overflow: hidden;
  background: var(--c-bg-elev);
}
.editor-pane.active { display: flex; }

/* 全屏（隐藏目录栏与顶栏） */
.app.fullscreen .sidebar,
.app.fullscreen .splitter,
.app.fullscreen .topbar { display: none; }

/* 欢迎页 */
.welcome {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--c-bg);
  z-index: 5;
}
.welcome.hidden { display: none; }
.welcome-inner { text-align: center; max-width: 460px; padding: 24px; }
.welcome-mark { color: var(--c-accent); opacity: .5; display: flex; justify-content: center; margin-bottom: 16px; }
.welcome-inner h2 { font-size: 17px; font-weight: 600; color: var(--c-text); margin-bottom: 8px; letter-spacing: .2px; }
.welcome-sub { font-size: 12.5px; color: var(--c-text-3); line-height: 1.8; }
.welcome-sub b { color: var(--c-text-2); font-weight: 600; }
.welcome-keys {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 16px;
  margin-top: 26px;
  font-size: 11.5px;
  color: var(--c-text-3);
}
.welcome-keys span { display: flex; align-items: center; gap: 4px; }

/* ==================== 状态栏 ==================== */
.statusbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 12px;
  height: var(--h-statusbar);
  background: var(--c-bg-elev);
  border-top: 1px solid var(--c-border);
  font-size: 11.5px;
  color: var(--c-text-3);
  z-index: 40;
  user-select: none;
}
.app.no-statusbar .statusbar { display: none; }
.status-left {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
  min-width: 0;
}
.status-right { display: flex; align-items: center; gap: 0; flex: none; }
.status-right:empty { display: none; }
.status-item {
  padding: 0 10px;
  border-right: 1px solid var(--c-border);
  white-space: nowrap;
  line-height: 1;
}
.status-item:last-child { border-right: none; padding-right: 0; }
.status-item.mono { font-family: var(--font-mono); font-size: 11px; }

/* ==================== 登录页 ==================== */
.login-mask {
  position: fixed;
  inset: 0;
  z-index: 9000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--c-bg);
  padding: 20px;
}
.login-card {
  width: 100%;
  max-width: 330px;
  padding: 30px 28px 26px;
  background: var(--c-bg-elev);
  border: 1px solid var(--c-border);
  border-radius: var(--r-xl);
  box-shadow: var(--sh-lg);
  display: flex;
  flex-direction: column;
  gap: 15px;
}
.login-head { text-align: center; margin-bottom: 6px; }
.login-icon {
  display: flex;
  justify-content: center;
  color: var(--c-accent);
  margin-bottom: 12px;
}
.login-head h1 { font-size: 19px; font-weight: 600; letter-spacing: .3px; }
.login-sub { font-size: 12.5px; color: var(--c-text-3); margin-top: 5px; }
.login-error {
  font-size: 12px;
  color: var(--c-danger);
  background: var(--c-danger-soft);
  padding: 8px 11px;
  border-radius: var(--r-md);
  line-height: 1.5;
}
.login-hint {
  font-size: 11.5px;
  color: var(--c-text-3);
  text-align: center;
  line-height: 1.6;
}
.login-card.shake { animation: shake .4s var(--ease); }
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-7px); }
  40% { transform: translateX(7px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}