/* ============================================================
   COMPONENTS STYLES
   Reusable UI components
   ============================================================ */

/* Setup Overlay */
#setup{
  position:fixed; inset:0; z-index:var(--z-index-fixed); display:flex; align-items:center; justify-content:center;
  background:radial-gradient(ellipse at 50% 20%, var(--color-bg-elevated) 0%, var(--color-bg) 65%);
  padding:var(--space-6);
}
.panel{
  width:100%; max-width:440px; border:1px solid var(--color-border); border-radius:var(--radius-xl);
  background:var(--color-bg-secondary); box-shadow:var(--shadow-lg); padding:var(--space-8) var(--space-8) var(--space-7);
  position:relative; overflow:hidden;
}
.panel::before{
  content:''; position:absolute; top:0; left:0; right:0; height:3px;
  background:linear-gradient(90deg, var(--color-warning), var(--color-danger), var(--color-brand-primary), var(--color-success));
}
.eyebrow{
  font-family:'JetBrains Mono',monospace; font-size:var(--font-size-xs); letter-spacing:0.15em;
  text-transform:uppercase; color:var(--color-text-tertiary); margin-bottom:var(--space-3);
}
.panel h1{
  font-family:var(--font-family-serif); font-weight:var(--font-weight-semibold); font-size:var(--font-size-5xl); line-height:var(--line-height-tight);
  margin:0 0 var(--space-2); letter-spacing:var(--letter-spacing-tight);
}
.panel h1 em{ color:var(--color-warning); font-style:italic; font-weight:var(--font-weight-medium); }
.panel p.sub{ color:var(--color-text-secondary); font-size:var(--font-size-sm); line-height:var(--line-height-normal); margin:0 0 var(--space-6); }
.field{ margin-bottom:var(--space-4); }
.field label{
  display:block; font-family:'JetBrains Mono',monospace; font-size:var(--font-size-xs);
  letter-spacing:0.08em; text-transform:uppercase; color:var(--color-text-tertiary); margin-bottom:var(--space-2);
}
.field input{
  width:100%; background:var(--color-bg-elevated); border:1px solid var(--color-border); border-radius:var(--radius-md);
  color:var(--color-text-primary); font-family:var(--font-family-sans); font-size:var(--font-size-base);
  padding:var(--space-3) var(--space-3); outline:none; transition:border-color var(--duration-normal) var(--ease-out);
}
.field input::placeholder{ color:var(--color-text-tertiary); }
.field input:focus{ border-color:var(--color-brand-primary); }
.row2{ display:flex; gap:var(--space-3); }
.row2 .field{ flex:1; }
.hint{ font-size:var(--font-size-xs); color:var(--color-text-tertiary); margin:-8px 0 var(--space-4); line-height:var(--line-height-normal); }
.btn-primary{
  width:100%; border:none; border-radius:var(--radius-md); padding:var(--space-3) var(--space-4); cursor:pointer;
  font-family:var(--font-family-sans); font-size:var(--font-size-base); font-weight:var(--font-weight-semibold);
  background:linear-gradient(135deg, var(--color-brand-primary) 0%, var(--color-brand-hover) 100%);
  color:#fff; transition:transform var(--duration-normal) var(--ease-out), box-shadow var(--duration-normal) var(--ease-out);
  letter-spacing:0.01em;
}
.btn-primary:hover{ transform:translateY(-1px); box-shadow:0 8px 22px rgba(139,92,246,0.4); }
.btn-primary:active{ transform:translateY(0); }
.btn-primary:disabled{ opacity:0.5; cursor:not-allowed; transform:none; box-shadow:none; }
.err-box{
  background:var(--color-danger-subtle); border:1px solid var(--color-danger); color:var(--color-danger);
  font-size:var(--font-size-sm); padding:var(--space-3) var(--space-3); border-radius:var(--radius-md); margin-bottom:var(--space-4); line-height:var(--line-height-normal); display:none;
  word-break: break-word;
}

/* Buttons */
.mode-buttons{
  display:flex; gap:var(--space-2);
}
.mode-btn{
  background:var(--color-bg-secondary); border:1px solid var(--color-border); border-radius:var(--radius-full);
  padding:var(--space-2) var(--space-4); font-family:var(--font-family-sans); font-size:var(--font-size-sm); font-weight:var(--font-weight-medium);
  color:var(--color-text-secondary); cursor:pointer; transition:all var(--duration-normal) var(--ease-out); display:flex; align-items:center; gap:var(--space-2);
}
.mode-btn:hover{
  border-color:var(--color-brand-primary); color:var(--color-text-primary);
}
.mode-btn.active{
  background:linear-gradient(135deg, var(--color-brand-primary) 0%, var(--color-brand-hover) 100%);
  border-color:var(--color-brand-primary); color:#fff;
}

.upload-btn{
  background:var(--color-bg-secondary); border:1px solid var(--color-border); border-radius:var(--radius-full);
  width:var(--size-avatar-md); height:var(--size-avatar-md); font-size:var(--font-size-xl); font-weight:var(--font-weight-semibold);
  color:var(--color-text-secondary); cursor:pointer; transition:all var(--duration-normal) var(--ease-out);
  display:flex; align-items:center; justify-content:center;
  flex-shrink:0;
}
.upload-btn:hover{
  border-color:var(--color-brand-primary); color:var(--color-brand-primary); background:var(--color-brand-subtle);
}

.chat-input-area input{
  flex:1; background:var(--color-bg-card); border:2px solid var(--color-border); border-radius:var(--radius-full);
  color:var(--color-text-primary); font-family:var(--font-family-sans); font-size:var(--font-size-base);
  padding:var(--space-3) var(--space-4); outline:none; transition:border-color var(--duration-normal) var(--ease-out), box-shadow var(--duration-normal) var(--ease-out);
}
.chat-input-area input:focus{ border-color:var(--color-brand-primary); box-shadow:0 0 0 3px rgba(139,92,246,0.2); }
.chat-input-area input::placeholder{ color:var(--color-text-tertiary); }
.chat-input-area button#sendBtn{
  background:linear-gradient(135deg, var(--color-brand-primary) 0%, var(--color-brand-secondary) 100%);
  border:none; border-radius:var(--radius-full); padding:0 var(--space-5);
  font-weight:var(--font-weight-semibold); color:var(--color-text-inverse); cursor:pointer; font-size:var(--font-size-base);
  transition:transform var(--duration-normal) var(--ease-out), box-shadow var(--duration-normal) var(--ease-out); white-space:nowrap;
}
.chat-input-area button#sendBtn:hover{ transform:scale(1.02); box-shadow:0 4px 16px rgba(139,92,246,0.4); }
.chat-input-area button#sendBtn:disabled{ opacity:0.5; cursor:not-allowed; transform:none; box-shadow:none; }

.file-preview-item{
  background:var(--color-bg-secondary); border:1px solid var(--color-border); border-radius:var(--radius-md);
  padding:var(--space-2) var(--space-3); display:flex; align-items:center; gap:var(--space-2);
  font-size:var(--font-size-xs); color:var(--color-text-primary); max-width:200px;
}
.file-preview-item .file-icon{
  font-size:var(--font-size-base); flex-shrink:0;
}
.file-preview-item .file-name{
  flex:1; overflow:hidden; text-overflow:ellipsis; white-space:nowrap;
}
.file-preview-item .file-remove{
  background:transparent; border:none; color:var(--color-text-tertiary);
  cursor:pointer; font-size:var(--font-size-sm); padding:var(--space-1); border-radius:var(--radius-sm);
  transition:all var(--duration-normal) var(--ease-out); flex-shrink:0;
}
.file-preview-item .file-remove:hover{
  color:var(--color-brand-primary); background:var(--color-brand-subtle);
}

.explain-differently-btn{
  background:var(--color-bg-secondary); border:1px solid var(--color-border); color:var(--color-text-primary);
  padding:var(--space-2) var(--space-3); border-radius:var(--radius-md); font-size:var(--font-size-xs); font-family:var(--font-family-sans);
  cursor:pointer; transition:all var(--duration-normal) var(--ease-out); margin-top:var(--space-3);
}
.explain-differently-btn:hover{
  background:var(--color-border); border-color:var(--color-text-secondary);
}
.explain-differently-btn:disabled{
  opacity:0.5; cursor:not-allowed;
}

/* Stats */
.stats-indicator{
  display:flex; align-items:center; gap:var(--space-3); font-family:var(--font-family-sans);
  font-size:var(--font-size-xs); color:var(--color-text-secondary);
}
.xp-badge, .streak-badge{
  display:flex; align-items:center; gap:var(--space-1); padding:var(--space-1) var(--space-2);
  background:var(--color-bg-secondary); border-radius:var(--radius-full); font-weight:var(--font-weight-semibold);
  color:var(--color-text-primary);
}
.xp-badge{ color:var(--color-warning); }
.streak-badge{ color:var(--color-danger); }
#xpDisplay, #streakDisplay{
  font-family:'JetBrains Mono',monospace; font-weight:var(--font-weight-semibold);
}

/* Loading States */
.loading-message{
  font-family:var(--font-family-sans); font-size:var(--font-size-md); font-weight:var(--font-weight-medium);
  color:var(--color-text-secondary); text-align:center; margin-bottom:var(--space-4);
}
.loading-dots{
  text-align:center; font-size:var(--font-size-2xl); color:var(--color-brand-primary);
  animation: pulse 1.5s infinite;
}
.regenerating-content{
  text-align:center; padding:var(--space-5);
}
.regenerating-content .loading-message{
  font-family:var(--font-family-sans); font-size:var(--font-size-sm); font-weight:var(--font-weight-medium);
  color:var(--color-text-secondary); margin-bottom:var(--space-2);
}
.regenerating-content .loading-dots{
  font-size:var(--font-size-xl); color:var(--color-brand-primary); animation:pulse 1.5s infinite;
}
.regeneration-error{
  text-align:center; padding:var(--space-5); color:var(--color-danger);
}
.regeneration-error .error-icon{
  font-size:var(--font-size-2xl); display:block; margin-bottom:var(--space-2);
}
.regeneration-error .error-text{
  font-family:var(--font-family-sans); font-size:var(--font-size-sm);
}

/* Offline Banner */
.offline-banner{
  position:fixed; top:0; left:0; right:0; background:var(--color-danger);
  color:#fff; padding:var(--space-3) var(--space-4); text-align:center; font-weight:var(--font-weight-semibold);
  z-index:var(--z-index-max); font-family:var(--font-family-sans); font-size:var(--font-size-sm);
  box-shadow:0 4px 12px rgba(0,0,0,0.3);
}

/* Tree Modal */
#treeModal{
  position:fixed; inset:0; z-index:var(--z-index-modal); background:var(--overlay-normal); backdrop-filter:blur(6px);
  display:none; align-items:center; justify-content:center; padding:var(--space-6);
}
#treeModal.open{ display:flex; }
.tree-panel{
  background:var(--color-bg-secondary); border:1px solid var(--color-border); border-radius:var(--radius-xl);
  max-width:540px; width:100%; max-height:80vh; padding:var(--space-7) var(--space-6) var(--space-5);
  box-shadow:var(--shadow-xl); display:flex; flex-direction:column;
}
.tree-panel .tree-header{
  display:flex; justify-content:space-between; align-items:center; margin-bottom:var(--space-4);
}
.tree-panel .tree-header h3{
  font-family:var(--font-family-serif); font-weight:var(--font-weight-semibold); font-size:var(--font-size-xl); margin:0;
}
.tree-panel .tree-header .close-btn{
  background:none; border:none; color:var(--color-text-secondary); font-size:var(--font-size-2xl); cursor:pointer;
  padding:0 var(--space-2); line-height:1;
}
.tree-panel .tree-header .close-btn:hover{ color:var(--color-text-primary); }
.tree-list{
  overflow-y:auto; flex:1; padding-right:var(--space-1);
}
.tree-list::-webkit-scrollbar{ width:4px; }
.tree-list::-webkit-scrollbar-thumb{ background:var(--color-border); border-radius:var(--radius-sm); }

.tree-node{
  display:flex; align-items:center; gap:var(--space-3); padding:var(--space-2) 0; border-bottom:1px solid rgba(42,44,56,0.4);
  font-size:var(--font-size-base); padding-left: calc(var(--depth, 0) * 20px);
}
.tree-node .status-icon{ font-size:var(--font-size-lg); width:24px; text-align:center; flex-shrink:0; }
.tree-node .node-name{ flex:1; color:var(--color-text-primary); }
.tree-node .node-desc{ font-size:var(--font-size-xs); color:var(--color-text-tertiary); margin-left:var(--space-2); }
.tree-node .node-badge{
  font-size:var(--font-size-xs); font-family:'JetBrains Mono',monospace; padding:var(--space-1) var(--space-2); border-radius:var(--radius-full);
  background:var(--color-bg); border:1px solid var(--color-border); color:var(--color-text-secondary);
}
.tree-node .node-badge.completed{ border-color:var(--color-success); color:var(--color-success); }
.tree-node .node-badge.inprogress{ border-color:var(--color-warning); color:var(--color-warning); }

/* Bottom Tab Bar */
#tabBar{
  position:fixed; bottom:0; left:0; right:0; z-index:var(--z-index-sticky);
  height:var(--layout-tab-height); background:var(--color-bg-secondary); border-top:1px solid var(--color-border);
  display:flex; align-items:center; justify-content:space-around;
  padding-bottom: env(safe-area-inset-bottom);
}
.tab-item{
  flex:1; display:flex; flex-direction:column; align-items:center; gap:var(--space-1);
  background:none; border:none; color:var(--color-text-tertiary); cursor:pointer;
  font-family:var(--font-family-sans); font-size:var(--font-size-xs); letter-spacing:0.04em;
  padding:var(--space-2) 0; transition:color var(--duration-normal) var(--ease-out); position:relative;
}
.tab-item .tab-icon{ font-size:var(--font-size-xl); line-height:1; }
.tab-item.active{ color:var(--color-brand-primary); }
.tab-item.active::after{
  content:''; position:absolute; bottom:0; left:50%; transform:translateX(-50%);
  width:24px; height:3px; background:var(--color-brand-primary); border-radius:var(--radius-sm);
}
.tab-item:hover{ color:var(--color-text-secondary); }
.tab-item.active:hover{ color:var(--color-brand-primary); }

.settings-btn{
  background:none; border:none; color:var(--color-text-tertiary); cursor:pointer;
  font-size:var(--font-size-2xl); padding:var(--space-2) var(--space-4); transition:color var(--duration-normal) var(--ease-out), transform var(--duration-normal) var(--ease-out);
}
.settings-btn:hover{ color:var(--color-text-secondary); transform:rotate(30deg); }

/* Settings Modal */
.settings-content{
  padding:var(--space-6);
}
.setting-item{
  margin-bottom:var(--space-6);
}
.setting-label{
  display:block; font-size:var(--font-size-base); font-weight:var(--font-weight-medium); color:var(--color-text-primary);
  margin-bottom:var(--space-3);
}
.theme-toggle{
  display:flex; gap:var(--space-3);
}
.theme-btn{
  flex:1; display:flex; flex-direction:column; align-items:center; gap:var(--space-2);
  padding:var(--space-4); border:2px solid var(--color-border); border-radius:var(--radius-lg);
  background:var(--color-bg-secondary); color:var(--color-text-primary); cursor:pointer;
  transition:all var(--duration-normal) var(--ease-out);
}
.theme-btn:hover{
  border-color:var(--color-brand-primary);
}
.theme-btn.active{
  border-color:var(--color-brand-primary); background:var(--color-bg-secondary);
  box-shadow:0 0 0 3px rgba(139,92,246,0.2);
}

.voice-toggle{
  display:flex; gap:var(--space-3);
}
.voice-btn{
  flex:1; display:flex; flex-direction:column; align-items:center; gap:var(--space-2);
  padding:var(--space-4); border:2px solid var(--color-border); border-radius:var(--radius-lg);
  background:var(--color-bg-secondary); color:var(--color-text-primary); cursor:pointer;
  transition:all var(--duration-normal) var(--ease-out);
}
.voice-btn:hover{
  border-color:var(--color-brand-primary);
}
.voice-btn.active{
  border-color:var(--color-brand-primary); background:var(--color-bg-secondary);
  box-shadow:0 0 0 3px rgba(139,92,246,0.2);
}
.theme-icon{
  font-size:var(--font-size-3xl);
}
.theme-name{
  font-size:var(--font-size-sm); font-weight:var(--font-weight-medium);
}

/* Conversation Sidebar */
.conversation-sidebar{
  position:fixed; left:0; top:0; bottom:var(--layout-tab-height); width:var(--layout-sidebar-width);
  background:var(--color-bg-secondary); border-right:1px solid var(--color-border); z-index:var(--z-index-sticky);
  display:flex; flex-direction:column; transform:translateX(-100%);
  transition:transform var(--duration-slow) var(--ease-out);
}
.conversation-sidebar.open{ transform:translateX(0); }
.sidebar-header{
  display:flex; justify-content:space-between; align-items:center;
  padding:var(--space-4) var(--space-5); border-bottom:1px solid var(--color-border);
}
.sidebar-header h3{
  font-family:var(--font-family-serif); font-weight:var(--font-weight-semibold); font-size:var(--font-size-lg); margin:0;
  color:var(--color-text-primary);
}
.sidebar-header-actions{
  display:flex; gap:var(--space-2); align-items:center;
}
.new-conv-btn{
  background:linear-gradient(135deg, var(--color-brand-primary) 0%, var(--color-brand-hover) 100%);
  color:#fff; border:none;
  width:32px; height:32px; border-radius:var(--radius-full); font-size:var(--font-size-lg);
  cursor:pointer; display:flex; align-items:center; justify-content:center;
  transition:transform var(--duration-normal) var(--ease-out), opacity var(--duration-normal) var(--ease-out);
}
.new-conv-btn:hover{ transform:scale(1.1); opacity:0.9; }
.close-sidebar-btn{
  background:transparent; color:var(--color-text-tertiary); border:none;
  width:32px; height:32px; border-radius:var(--radius-full); font-size:var(--font-size-xl);
  cursor:pointer; display:flex; align-items:center; justify-content:center;
  transition:color var(--duration-normal) var(--ease-out), background var(--duration-normal) var(--ease-out);
}
.close-sidebar-btn:hover{ color:var(--color-text-primary); background:var(--color-border); }
.open-sidebar-btn{
  background:transparent; color:var(--color-text-secondary); border:none;
  width:32px; height:32px; border-radius:var(--radius-full); font-size:var(--font-size-lg);
  cursor:pointer; display:flex; align-items:center; justify-content:center;
  transition:color var(--duration-normal) var(--ease-out), background var(--duration-normal) var(--ease-out);
}
.open-sidebar-btn:hover{ color:var(--color-text-primary); background:var(--color-border); }
.conversation-list{
  flex:1; overflow-y:auto; padding:var(--space-2);
}
.conversation-list::-webkit-scrollbar{ width:4px; }
.conversation-list::-webkit-scrollbar-thumb{ background:var(--color-border); border-radius:var(--radius-sm); }
.sidebar-footer {
  position:relative; flex-shrink:0; padding:12px; border-top:1px solid var(--color-border);
  background:var(--color-bg-secondary);
}
.account-btn {
  width:100%; min-height:48px; display:flex; align-items:center; gap:10px; padding:8px;
  border:1px solid transparent; border-radius:10px; background:transparent; color:var(--color-text-primary);
  font:500 14px var(--font-family-sans); text-align:left; cursor:pointer;
  transition:background var(--duration-normal) var(--ease-out), border-color var(--duration-normal) var(--ease-out);
}
.account-btn:hover, .account-btn[aria-expanded="true"] { background:var(--color-bg-hover); border-color:var(--color-border); }
.account-avatar {
  width:30px; height:30px; flex:0 0 30px; display:grid; place-items:center; overflow:hidden;
  border-radius:50%; background:var(--color-brand-subtle); color:var(--color-brand-primary); font-size:12px; font-weight:700;
}
.account-avatar img { width:100%; height:100%; object-fit:cover; }
.account-name { flex:1; min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.account-more { color:var(--color-text-tertiary); font-size:15px; letter-spacing:1px; }
.account-menu {
  position:absolute; right:12px; bottom:68px; left:12px; z-index:calc(var(--z-index-sticky) + 1);
  padding:6px; border:1px solid var(--color-border); border-radius:12px; background:var(--color-bg-elevated); box-shadow:var(--shadow-md);
}
.account-menu[hidden] { display:none; }
.account-menu-item {
  width:100%; display:flex; align-items:center; gap:10px; padding:10px; border:0; border-radius:8px;
  background:transparent; color:var(--color-text-primary); font:500 14px var(--font-family-sans); cursor:pointer; text-align:left;
}
.account-menu-item:hover { background:var(--color-bg-hover); }

/* Learning workspace starter state */
.sidebar-brand {
  display:flex; align-items:center; gap:10px; padding:22px 20px 18px;
  color:var(--color-text-primary); font-size:21px; font-weight:700; letter-spacing:-.04em;
}
.sidebar-brand-mark {
  width:34px; height:34px; display:grid; place-items:center; border-radius:11px; color:#fff;
  background:linear-gradient(135deg, #E66AA1, #7B62D5); box-shadow:0 6px 16px rgba(124,105,216,.22);
}
.sidebar-header { padding:10px 20px 14px; border:0; display:block; }
.sidebar-header h3 { margin:16px 0 10px 14px; color:var(--color-text-tertiary); font-family:var(--font-family-sans); font-size:11px; font-weight:600; letter-spacing:.10em; text-transform:uppercase; }
.sidebar-header-actions { display:block; }
.new-conv-btn {
  width:100%; height:54px; padding:0 18px; border-radius:13px; justify-content:flex-start; gap:12px;
  font:600 14px var(--font-family-sans); box-shadow:none;
}
.new-conv-btn span { font-size:23px; font-weight:400; line-height:1; }
.close-sidebar-btn { position:absolute; right:12px; top:18px; }
.conversation-list { padding:6px 20px; }
.conversation-item { margin:2px 0; padding:12px 14px; border:0; border-radius:10px; }
.conversation-item.active { border-left:0; background:var(--color-bg-elevated); box-shadow:var(--shadow-xs); }

.chat-header {
  min-height:54px; padding:9px 28px; background:var(--color-bg); border-bottom:0;
}
.chat-header-left > span { font:600 14px var(--font-family-sans); }
#topicHint { display:none; }
.stats-indicator { display:none; }
.mode-buttons { margin-left:auto; padding:2px; border:1px solid var(--color-border); background:var(--color-bg-elevated); }
.mode-btn { padding:7px 12px; font-size:12px; }

.chat-messages { max-width:1000px; width:100%; align-self:center; padding:24px 32px; }
.chat-messages:has(.chat-welcome) { display:flex; justify-content:center; align-items:center; }
.chat-messages:has(.chat-welcome) > .msg { display:none; }
.chat-welcome { width:min(850px,100%); padding:32px 18px 48px; text-align:center; }
.welcome-mark {
  width:60px; height:60px; display:grid; place-items:center; margin:0 auto 22px; border-radius:20px;
  color:#fff; font-size:26px; background:linear-gradient(135deg,#E66AA1,#7B62D5); box-shadow:0 12px 28px rgba(124,105,216,.20);
}
.welcome-kicker { margin:0 0 14px; color:var(--color-text-tertiary); font:600 11px var(--font-family-mono); letter-spacing:.12em; text-transform:uppercase; }
.chat-welcome h1 { margin:0; color:var(--color-text-primary); font:600 clamp(40px,4.5vw,62px)/1.05 var(--font-family-sans); letter-spacing:-.06em; }
.welcome-copy { max-width:530px; margin:20px auto 0; color:var(--color-text-secondary); font-size:16px; line-height:1.65; }
.starter-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:12px; max-width:850px; margin:40px auto 0; text-align:left; }
.starter-card {
  min-height:135px; padding:18px; display:grid; grid-template-columns:38px 1fr; grid-template-rows:auto auto; gap:3px 12px;
  border:1px solid var(--color-border); border-radius:15px; background:var(--color-bg-elevated); color:var(--color-text-primary); text-align:left; cursor:pointer;
  transition:transform var(--duration-normal) var(--ease-out), border-color var(--duration-normal) var(--ease-out), box-shadow var(--duration-normal) var(--ease-out);
}
.starter-card:hover { transform:translateY(-2px); border-color:var(--color-brand-primary); box-shadow:var(--shadow-sm); }
.starter-icon { grid-row:span 2; width:34px; height:34px; display:grid; place-items:center; border-radius:10px; color:var(--color-brand-primary); background:var(--color-brand-subtle); font-size:18px; }
.starter-explain { color:#7863C6; background:#EEE9FF; }.starter-reels { color:#B97920; background:#FFF3D8; }
.starter-card strong { align-self:end; font-size:14px; }.starter-card small { color:var(--color-text-secondary); font-size:12px; line-height:1.35; }
.chat-input-area { max-width:1000px; width:100%; align-self:center; padding:16px 28px 24px; border-top:0; background:var(--color-bg); }
.chat-input-area input { min-height:58px; background:var(--color-bg-elevated); border:1px solid var(--color-border); box-shadow:var(--shadow-xs); }
.chat-input-area button#sendBtn { min-height:44px; min-width:70px; }
.upload-btn { width:44px; height:44px; }

@media (min-width:850px) {
  .conversation-sidebar { width:340px; bottom:0; transform:translateX(0); background:var(--color-bg-secondary); }
  #app .page, #app.with-sidebar .page { padding-left:340px; }
  #tabBar, #app.with-sidebar #tabBar { left:340px; }
  .open-sidebar-btn, .close-sidebar-btn { display:none; }
  #app { padding-bottom:0; }.chat-header { margin-left:0; }
}
@media (max-width:700px) {
  .sidebar-brand { padding:18px; }.starter-grid { grid-template-columns:1fr; margin-top:28px; }.starter-card { min-height:84px; }
  .chat-welcome { padding:16px 0 24px; }.chat-welcome h1 { font-size:42px; }.welcome-copy { font-size:14px; }
  .chat-messages { padding:18px 16px; }.chat-input-area { padding:12px 14px 16px; }.mode-buttons { display:none; }
}
.conversation-item{
  padding:var(--space-3) var(--space-4); border-radius:var(--radius-md); cursor:pointer;
  margin-bottom:var(--space-1); transition:background var(--duration-normal) var(--ease-out);
  position:relative;
}
.conversation-item:hover{ background:var(--color-bg); }
.conversation-item.active{
  background:var(--color-brand-subtle); border-left:3px solid var(--color-brand-primary);
}
.conversation-item-name{
  font-size:var(--font-size-base); font-weight:var(--font-weight-medium); color:var(--color-text-primary);
  margin-bottom:var(--space-1); white-space:nowrap; overflow:hidden;
  text-overflow:ellipsis;
}
/* Conversation history actions */
.conversation-item {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 12px 42px 12px 14px;
}
.conversation-item-name {
  flex: 1;
  margin-bottom: 0;
}
.conversation-item.is-pinned .conversation-item-name::before {
  content: "\01F4CC";
  display: inline-block;
  margin-right: 7px;
  color: var(--color-brand-primary);
  font-size: 14px;
  transform: none;
}
.conversation-menu-trigger {
  position: absolute;
  top: 50%;
  right: 8px;
  width: 28px;
  height: 28px;
  transform: translateY(-50%);
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  font-size: 17px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 1px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 150ms ease, background 150ms ease;
}
.conversation-item:hover .conversation-menu-trigger,
.conversation-item:focus-within .conversation-menu-trigger {
  opacity: 1;
  pointer-events: auto;
}
.conversation-menu-trigger:hover,
.conversation-menu-trigger[aria-expanded="true"] {
  background: var(--color-bg-elevated);
  color: var(--color-text-primary);
}
.conversation-action-menu {
  position: absolute;
  z-index: 40;
  top: calc(100% - 5px);
  right: 6px;
  width: 132px;
  padding: 5px;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  background: var(--color-bg-elevated);
  box-shadow: var(--shadow-md);
}
.conversation-action-menu[hidden] { display: none; }
.conversation-action-menu button {
  width: 100%;
  padding: 8px 10px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--color-text-primary);
  cursor: pointer;
  font: inherit;
  font-size: var(--font-size-sm);
  text-align: left;
}
.conversation-action-menu button:hover { background: var(--color-bg); }
.conversation-action-menu button.delete { color: var(--color-danger); }

/* Adjust main content when sidebar is open */
#app.with-sidebar .page{ padding-left:var(--layout-sidebar-width); }
#app.with-sidebar #tabBar{ left:var(--layout-sidebar-width); }

/* Bookmarks Modal */
.bookmarks-list {
  padding: var(--space-5);
  overflow-y: auto;
  flex: 1;
}

.bookmarks-empty {
  padding: var(--space-10) var(--space-5);
  text-align: center;
  color: var(--color-text-secondary);
}

.bookmarks-empty p {
  margin: 0;
  font-size: var(--font-size-base);
}

.bookmark-item {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  margin-bottom: var(--space-3);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
}

.bookmark-item:hover {
  border-color: var(--color-success);
  transform: translateY(-2px);
}

.bookmark-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-2);
}

.bookmark-item-title {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  font-size: var(--font-size-base);
}

.bookmark-item-type {
  font-size: var(--font-size-xs);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-full);
  background: var(--color-bg-elevated);
  color: var(--color-text-secondary);
  text-transform: uppercase;
}

.bookmark-item-content {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-normal);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-clamp: 2;
}

.bookmark-item-actions {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.bookmark-action-btn {
  flex: 1;
  padding: var(--space-2);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-xs);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
}

.bookmark-action-btn.visit {
  background: var(--color-success);
  color: white;
}

.bookmark-action-btn.visit:hover {
  background: var(--color-success-dark);
}

.bookmark-action-btn.remove {
  background: var(--color-bg-elevated);
  color: var(--color-danger);
  border: 1px solid var(--color-danger);
}

.bookmark-action-btn.remove:hover {
  background: var(--color-danger);
  color: white;
}

.bookmark-btn {
  position: absolute;
  top: var(--space-4);
  left: var(--space-4);
  background: var(--overlay-subtle);
  border: none;
  border-radius: var(--radius-full);
  width: var(--size-avatar-md);
  height: var(--size-avatar-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
  z-index: 20;
  pointer-events: auto;
  touch-action: manipulation;
}

.bookmark-btn:hover {
  background: var(--overlay-normal);
  transform: scale(1.1);
}

.bookmark-btn.bookmarked {
  background: var(--color-brand-primary);
  color: white;
}

.bookmark-btn svg {
  width: var(--size-icon-md);
  height: var(--size-icon-md);
  fill: currentColor;
}

.speaker-btn {
  position: absolute;
  top: var(--space-4);
  left: 64px;
  background: var(--overlay-subtle);
  border: none;
  border-radius: var(--radius-full);
  width: var(--size-avatar-md);
  height: var(--size-avatar-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
  z-index: 10;
}

.speaker-btn:hover {
  background: var(--overlay-normal);
  transform: scale(1.1);
}

.speaker-btn.speaking {
  background: var(--color-success);
  color: white;
  animation: pulse 1.5s var(--ease-in-out) infinite;
}

.speaker-btn svg {
  width: var(--size-icon-md);
  height: var(--size-icon-md);
  fill: currentColor;
}

.reel-ai-explain-btn {
  position: absolute;
  top: var(--space-4);
  left: 124px;
  background: var(--overlay-subtle);
  border: none;
  border-radius: var(--radius-full);
  width: var(--size-avatar-md);
  height: var(--size-avatar-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
  z-index: 10;
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-brand-primary);
}

.reel-ai-explain-btn:hover {
  background: var(--overlay-normal);
  transform: scale(1.1);
}

.reel-ai-explain-btn span {
  display: none;
}

/* Modal Base */
.modal {
  position: fixed;
  inset: 0;
  z-index: var(--z-index-modal);
  background: var(--overlay-normal);
  backdrop-filter: blur(6px);
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
}

.modal-content {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  max-width: 540px;
  width: 100%;
  max-height: 80vh;
  padding: var(--space-7) var(--space-6) var(--space-5);
  box-shadow: var(--shadow-xl);
  display: flex;
  flex-direction: column;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-4);
}

.modal-header h3 {
  font-family: var(--font-family-serif);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-xl);
  margin: 0;
}

.close-btn {
  background: none;
  border: none;
  color: var(--color-text-secondary);
  font-size: var(--font-size-2xl);
  cursor: pointer;
  padding: 0 var(--space-2);
  line-height: 1;
}

.close-btn:hover {
  color: var(--color-text-primary);
}

/* Lightweight in-app confirmations used instead of browser pop-ups. */
.app-dialog-backdrop { position: fixed; inset: 0; z-index: var(--z-index-modal); display: grid; place-items: center; padding: var(--space-4); background: rgba(15, 12, 24, .55); backdrop-filter: blur(5px); }
.app-dialog { width: min(100%, 420px); padding: var(--space-6); color: var(--color-text-primary); background: var(--color-bg-card); border: 1px solid var(--color-border); border-radius: var(--radius-xl); box-shadow: var(--shadow-xl); }
.app-dialog h2 { margin: 0 0 var(--space-2); font-family: var(--font-family-serif); font-size: var(--font-size-xl); }
.app-dialog p { margin: 0 0 var(--space-5); color: var(--color-text-secondary); font-size: var(--font-size-sm); line-height: var(--line-height-relaxed); }
.app-dialog label { display: grid; gap: var(--space-2); color: var(--color-text-secondary); font-size: var(--font-size-sm); font-weight: var(--font-weight-medium); }
.app-dialog input { width: 100%; padding: var(--space-3); color: var(--color-text-primary); background: var(--color-bg-secondary); border: 1px solid var(--color-border); border-radius: var(--radius-md); font: inherit; outline: none; }
.app-dialog input:focus { border-color: var(--color-brand-primary); }
.app-dialog-actions { display: flex; justify-content: flex-end; gap: var(--space-2); margin-top: var(--space-6); }
.app-dialog-actions button { padding: var(--space-2) var(--space-4); border: 1px solid var(--color-border); border-radius: var(--radius-md); font: inherit; font-size: var(--font-size-sm); font-weight: var(--font-weight-semibold); cursor: pointer; }
.app-dialog-cancel { color: var(--color-text-primary); background: var(--color-bg-secondary); }
.app-dialog-confirm { color: #fff; background: var(--color-brand-primary); border-color: var(--color-brand-primary) !important; }
.app-dialog-confirm.danger { background: var(--color-danger); border-color: var(--color-danger) !important; }
.app-dialog-confirm:disabled { opacity: .45; cursor: not-allowed; }

/* Skeleton Loading Screens */
.skeleton {
  background: linear-gradient(90deg, var(--color-bg) 25%, var(--color-bg-secondary) 50%, var(--color-bg) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

.skeleton-text {
  height: var(--space-4);
  margin-bottom: var(--space-2);
  border-radius: var(--radius-sm);
}

.skeleton-text-sm {
  height: var(--space-3);
  width: 60%;
  margin-bottom: var(--space-2);
  border-radius: var(--radius-sm);
}

.skeleton-avatar {
  width: var(--size-avatar-md);
  height: var(--size-avatar-md);
  border-radius: var(--radius-full);
}

.skeleton-card {
  height: 80px;
  border-radius: var(--radius-md);
  margin-bottom: var(--space-3);
}

.skeleton-row {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.skeleton-row .skeleton-avatar {
  flex-shrink: 0;
}

.skeleton-row .skeleton-content {
  flex: 1;
}

.skeleton-table-row {
  height: 48px;
  margin-bottom: var(--space-2);
  border-radius: var(--radius-sm);
}

.skeleton-stat-card {
  height: 100px;
  border-radius: var(--radius-md);
}

.skeleton-chart {
  height: 200px;
  border-radius: var(--radius-md);
}

.skeleton-button {
  height: var(--size-button-lg);
  width: 120px;
  border-radius: var(--radius-md);
}

.skeleton-input {
  height: 44px;
  border-radius: var(--radius-md);
}

/* Empty States */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-12) var(--space-6);
  text-align: center;
}

.empty-state-icon {
  font-size: var(--font-size-5xl);
  margin-bottom: var(--space-4);
  opacity: 0.5;
}

.empty-state-title {
  font-family: var(--font-family-serif);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-lg);
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.empty-state-description {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
  max-width: 300px;
}

.empty-state-action {
  background: linear-gradient(135deg, var(--color-brand-primary) 0%, var(--color-brand-hover) 100%);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: transform var(--duration-normal) var(--ease-out), box-shadow var(--duration-normal) var(--ease-out);
}

.empty-state-action:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(139, 92, 246, 0.4);
}

/* ============================================================
   Lesson Navigation Styles
   ============================================================ */

.lesson-progress-bar {
  height: 4px;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-3);
  overflow: hidden;
}

.lesson-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-brand-primary) 0%, var(--color-brand-secondary) 100%);
  border-radius: var(--radius-full);
  transition: width var(--duration-normal) var(--easing-default);
}

.lesson-nav-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.lesson-nav-btn {
  padding: var(--space-2) var(--space-4);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-family: var(--font-family-sans);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--duration-fast) var(--easing-default);
}

.lesson-nav-btn:hover:not(:disabled) {
  background: var(--color-bg-hover);
  border-color: var(--color-border-hover);
}

.lesson-nav-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.lesson-info {
  flex: 1;
  text-align: center;
}

.lesson-number {
  display: block;
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-1);
}

.lesson-title {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

/* ============================================================
   Course Creation Styles
   ============================================================ */

.clarification-question {
  margin-bottom: var(--space-3);
}

.clarification-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.clarification-option {
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-family: var(--font-family-sans);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--duration-fast) var(--easing-default);
  text-align: left;
}

.clarification-option:hover {
  background: var(--color-bg-hover);
  border-color: var(--color-border-hover);
}

/* Topic todo list in chat */
.topic-todo-editor,
.topic-todo-progress {
  display: block;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  max-width: 100%;
}

.topic-todo-header h3 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-family-serif);
  font-size: var(--font-size-md);
}

.topic-todo-meta {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin: 0 0 var(--space-2);
}

.topic-todo-hint {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  margin: 0 0 var(--space-3);
}

.topic-todo-hint kbd {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 1px 6px;
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
}

.topic-todo-list {
  list-style: none;
  margin: 0 0 var(--space-3);
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.topic-todo-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.topic-todo-item.dragging {
  opacity: 0.5;
}

.topic-drag-handle {
  cursor: grab;
  color: var(--color-text-tertiary);
  user-select: none;
}

.topic-check {
  flex-shrink: 0;
}

.topic-title-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--color-text-primary);
  font-family: var(--font-family-sans);
  font-size: var(--font-size-sm);
  outline: none;
  padding: var(--space-1);
  border-bottom: 1px dashed transparent;
}

.topic-title-input:focus {
  border-bottom-color: var(--color-brand-primary);
}

.topic-title-readonly {
  flex: 1;
  font-size: var(--font-size-sm);
}

.topic-delete-btn {
  background: none;
  border: none;
  color: var(--color-text-tertiary);
  cursor: pointer;
  padding: var(--space-1);
  border-radius: var(--radius-sm);
}

.topic-delete-btn:hover {
  color: var(--color-danger);
  background: var(--color-danger-subtle);
}

.topic-todo-actions {
  display: flex;
  gap: var(--space-2);
  justify-content: space-between;
  margin-top: var(--space-4);
}

.topic-todo-add-btn,
.topic-todo-start-btn {
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  border: 1px solid var(--color-border);
}

.topic-todo-add-btn {
  background: var(--color-bg-secondary);
  color: var(--color-text-primary);
}

.topic-todo-start-btn {
  background: linear-gradient(135deg, var(--color-brand-primary), var(--color-brand-hover));
  color: #fff;
  border: none;
}

.topic-todo-start-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.lesson-reel-count {
  display: block;
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
}

/* Reverted learning-plan dashboard experiment.
.topic-todo-editor,
.topic-todo-progress {
  width: min(100%, 680px);
  display: block !important;
  overflow: hidden;
  background: #fffdf8;
  border: 1px solid #e7ddca;
  border-radius: 20px;
  padding: 0;
  box-shadow: 0 18px 45px rgba(65, 47, 21, .08);
}

.topic-plan-hero {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px 22px;
  color: #fff;
  background: linear-gradient(115deg, #2b2352, #5f4db2 58%, #8974dc);
}

.topic-plan-icon {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  flex: 0 0 auto;
  color: #3e317a;
  background: #fff;
  border-radius: 12px;
  font-size: 19px;
}

.topic-plan-eyebrow {
  margin: 0 0 2px;
  color: rgba(255,255,255,.72);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.topic-plan-hero h3 {
  margin: 0;
  color: #fff;
  font-family: var(--font-family-serif);
  font-size: 21px;
  line-height: 1.1;
}

.topic-plan-count {
  margin-left: auto;
  padding: 6px 9px;
  color: #fff;
  background: rgba(255,255,255,.14);
  border: 1px solid rgba(255,255,255,.18);
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 600;
}

.topic-todo-editor .topic-todo-header,
.topic-todo-progress .topic-todo-header { padding: 18px 22px 9px; }
.topic-todo-editor .topic-todo-header h4,
.topic-todo-progress .topic-todo-header h4 { margin: 0 0 7px; color: #272335; font-family: var(--font-family-serif); font-size: 17px; line-height: 1.3; }
.topic-todo-editor .topic-todo-meta,
.topic-todo-progress .topic-todo-meta { display: flex; align-items: center; gap: 8px; margin: 0; color: #746d7e; font-size: 12px; }
.topic-todo-editor .topic-todo-meta strong,
.topic-todo-progress .topic-todo-meta strong { color: #6651bd; font-weight: 700; text-transform: capitalize; }
.topic-todo-editor .topic-todo-meta span,
.topic-todo-progress .topic-todo-meta span { width: 3px; height: 3px; background: #ada5b4; border-radius: 50%; }
.topic-todo-editor .topic-todo-hint { margin: 8px 0 0; color: #8b8394; font-size: 12px; }

.topic-todo-editor .topic-todo-list,
.topic-todo-progress .topic-todo-list { margin: 7px 0 0; padding: 0 14px; gap: 7px; }
.topic-todo-editor .topic-todo-item,
.topic-todo-progress .topic-todo-item { gap: 10px; min-height: 48px; padding: 7px 10px; background: #faf7f0; border: 1px solid #eee5d5; border-radius: 12px; transition: transform var(--duration-fast) var(--ease-out), border-color var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) var(--ease-out); }
.topic-todo-editor .topic-todo-item:hover { border-color: #cbbde9; box-shadow: 0 5px 12px rgba(70,53,115,.08); transform: translateY(-1px); }
.topic-todo-editor .topic-drag-handle { width: 14px; color: #a49aaa; font-size: 18px; font-weight: 700; letter-spacing: -4px; }
.topic-todo-editor .topic-check,
.topic-todo-progress .topic-check { display: grid; width: 25px; height: 25px; place-items: center; color: #7864c4; background: #eee8fb; border-radius: 8px; font-size: 11px; font-weight: 700; }
.topic-title-field { display: flex; flex: 1; }
.topic-todo-editor .topic-title-input { color: #302a3b; font-size: 13px; font-weight: 500; padding: 5px 1px; border-bottom: 1px solid transparent; }
.topic-todo-editor .topic-title-input:focus { border-bottom-color: #7964c8; }
.topic-todo-progress .topic-title-readonly { display: flex; flex-direction: column; gap: 2px; color: #302a3b; font-size: 13px; }
.topic-todo-progress .topic-title-readonly strong { font-weight: 600; }
.topic-todo-progress .topic-title-readonly small { color: #918896; font-size: 11px; }
.topic-todo-progress .topic-todo-item.current { background: #f5f1ff; border-color: #cfc1f3; }
.topic-todo-progress .topic-todo-item.current .topic-check { color: #fff; background: #705bc2; }
.topic-todo-progress .topic-todo-item.completed .topic-check { color: #fff; background: #46a983; }
.topic-todo-progress .topic-todo-item.completed .topic-title-readonly strong { color: #6e6877; text-decoration: line-through; }
.topic-todo-editor .topic-delete-btn { color: #a79eab; padding: 4px 6px; border-radius: 7px; font-size: 18px; line-height: 1; }

.topic-todo-editor .topic-todo-actions { gap: 10px; padding: 16px 22px 20px; }
.topic-todo-editor .topic-todo-add-btn,
.topic-todo-editor .topic-todo-start-btn { min-height: 38px; padding: 8px 13px; border-radius: 10px; font-size: 12px; }
.topic-todo-editor .topic-todo-add-btn { color: #544b60; background: transparent; border-color: #ded5e8; }
.topic-todo-editor .topic-todo-start-btn { margin-left: auto; background: linear-gradient(135deg, #6c58bb, #8b73d6); box-shadow: 0 7px 14px rgba(99,76,174,.22); }
.topic-todo-editor .topic-todo-start-btn:hover { transform: translateY(-1px); box-shadow: 0 10px 18px rgba(99,76,174,.28); }
.topic-todo-progress .topic-todo-list { padding-bottom: 18px; }
.topic-todo-progress .progress-hero { background: linear-gradient(115deg, #273f5c, #4779a8); }
.topic-todo-progress .progress-hero .topic-plan-icon { color: #3e6d9a; }

.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

@media (max-width: 480px) {
  .topic-plan-hero { padding: 17px; }
  .topic-todo-editor .topic-todo-header,
  .topic-todo-progress .topic-todo-header { padding: 16px 17px 8px; }
  .topic-todo-editor .topic-todo-list,
  .topic-todo-progress .topic-todo-list { padding: 0 10px; }
  .topic-todo-editor .topic-todo-actions { padding: 14px 17px 17px; }
  .topic-plan-count,
  .topic-todo-editor .topic-drag-handle { display: none; }
}

*/

.complete-topic-btn {
  background: var(--color-success-subtle) !important;
  border-color: var(--color-success) !important;
  color: var(--color-success) !important;
}

.generating-indicator {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.generating-indicator .dots {
  display: flex;
  gap: var(--space-1);
}

.generating-indicator .dots span {
  animation: pulse 1.4s infinite;
}

.generating-indicator .dots span:nth-child(2) {
  animation-delay: 0.2s;
}

.generating-indicator .dots span:nth-child(3) {
  animation-delay: 0.4s;
}

.progress-bar {
  width: 100%;
  height: 4px;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-full);
  margin-top: var(--space-2);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-brand-primary) 0%, var(--color-brand-secondary) 100%);
  border-radius: var(--radius-full);
  transition: width var(--duration-normal) var(--easing-default);
}

.course-created-content h3 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.course-created-content p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-1);
}

.course-created-content p strong {
  color: var(--color-text-primary);
}

.course-stats {
  display: flex;
  gap: var(--space-4);
  margin: var(--space-3) 0;
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

.start-course-btn {
  margin-top: var(--space-3);
  padding: var(--space-3) var(--space-6);
  background: linear-gradient(135deg, var(--color-brand-primary) 0%, var(--color-brand-secondary) 100%);
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text-inverse);
  font-family: var(--font-family-sans);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--duration-fast) var(--easing-default);
}

.start-course-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(139, 92, 246, 0.4);
}

/* ============================================================
   Conversation Progress Styles
   ============================================================ */

.conversation-progress {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.conversation-progress-bar {
  flex: 1;
  height: 4px;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.conversation-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-brand-primary) 0%, var(--color-brand-secondary) 100%);
  border-radius: var(--radius-full);
  transition: width var(--duration-normal) var(--easing-default);
}

.conversation-progress-text {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  min-width: 32px;
  text-align: right;
}

/* ============================================================
   Course Completion Styles
   ============================================================ */

.course-completed-content h3 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.course-completed-content p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-1);
}

.course-completed-content p strong {
  color: var(--color-text-primary);
}

.course-completed-content .course-stats {
  display: flex;
  gap: var(--space-4);
  margin: var(--space-3) 0;
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

.course-completed-content .recommendations {
  margin: var(--space-4) 0;
}

.course-completed-content .recommendations h4 {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
}

.recommendation-item {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  margin-bottom: var(--space-2);
}

.recommendation-item strong {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  margin-bottom: var(--space-1);
}

.recommendation-item p {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-1);
}

.recommendation-meta {
  display: block;
  font-size: var(--font-size-xs);
  color: var(--color-text-faint);
  margin-bottom: var(--space-2);
}

.start-recommendation-btn,
.new-course-btn {
  padding: var(--space-2) var(--space-4);
  background: linear-gradient(135deg, var(--color-brand-primary) 0%, var(--color-brand-secondary) 100%);
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text-inverse);
  font-family: var(--font-family-sans);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--duration-fast) var(--easing-default);
}

.start-recommendation-btn:hover,
.new-course-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(139, 92, 246, 0.4);
}

.new-course-btn {
  margin-top: var(--space-3);
  width: 100%;
}

/* ============================================================
   SKELETON LOADING STATES
   ============================================================ */

@keyframes skeleton-loading {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-surface-tertiary) 25%,
    var(--color-surface-secondary) 50%,
    var(--color-surface-tertiary) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: var(--radius-sm);
}

.skeleton-text {
  height: 1em;
  margin-bottom: var(--space-2);
}

.skeleton-text-sm {
  height: 0.75em;
  margin-bottom: var(--space-1);
}

.skeleton-text-lg {
  height: 1.5em;
  margin-bottom: var(--space-3);
}

.skeleton-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
}

.skeleton-avatar-lg {
  width: 60px;
  height: 60px;
  border-radius: 50%;
}

.skeleton-button {
  height: 40px;
  width: 120px;
  border-radius: var(--radius-md);
}

.skeleton-card {
  height: 200px;
  border-radius: var(--radius-md);
}

.skeleton-reel {
  height: 300px;
  border-radius: var(--radius-md);
}

.skeleton-list-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  border-bottom: 1px solid var(--color-border);
}

.skeleton-list-item .skeleton-avatar {
  flex-shrink: 0;
}

.skeleton-list-item .skeleton-text {
  flex: 1;
}

.skeleton-chat-message {
  padding: var(--space-3);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-2);
  max-width: 80%;
}

.skeleton-chat-message.user {
  margin-left: auto;
  background: linear-gradient(
    90deg,
    var(--color-brand-primary) 25%,
    var(--color-brand-secondary) 50%,
    var(--color-brand-primary) 75%
  );
}

.skeleton-chat-message.ai {
  background: linear-gradient(
    90deg,
    var(--color-surface-tertiary) 25%,
    var(--color-surface-secondary) 50%,
    var(--color-surface-tertiary) 75%
  );
}

.skeleton-document-preview {
  padding: var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.skeleton-document-preview .skeleton-text-lg {
  margin-bottom: var(--space-4);
}

.skeleton-document-preview .skeleton-text {
  margin-bottom: var(--space-2);
}

.skeleton-course-card {
  padding: var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  height: 150px;
}

.skeleton-course-card .skeleton-text-lg {
  margin-bottom: var(--space-3);
}

.skeleton-course-card .skeleton-text {
  margin-bottom: var(--space-2);
}

/* Loading overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.loading-overlay-content {
  background: var(--color-surface-primary);
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  text-align: center;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-brand-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto var(--space-3);
}

.loading-text {
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
}

/* Progress bar skeleton */
.skeleton-progress-bar {
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--color-surface-tertiary);
  overflow: hidden;
}

.skeleton-progress-bar-fill {
  height: 100%;
  background: linear-gradient(
    90deg,
    var(--color-brand-primary) 25%,
    var(--color-brand-secondary) 50%,
    var(--color-brand-primary) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  width: 60%;
}

/* Final desktop workspace sizing fixes. */
.new-conv-btn {
  height:46px;
  min-height:46px;
  padding:0 15px;
  border-radius:11px;
  font-size:13px;
}
.new-conv-btn span { font-size:20px; }
.settings-btn { display:none !important; }

/* Compact composer card */
.chat-input-area {
  position:relative; display:block; max-width:960px; width:calc(100% - 48px); margin:0 auto;
  padding:0; border:0; background:transparent;
}
.chat-input-area input {
  width:100%; height:104px; min-height:104px; padding:18px 58px 54px 20px;
  border:1px solid var(--color-border); border-radius:20px; background:var(--color-bg-elevated);
  box-shadow:var(--shadow-xs); font-size:16px;
}
.chat-input-area input::placeholder { color:var(--color-text-tertiary); opacity:1; }
.chat-input-area::after {
  content:'Enter to send · Shift + Enter for a new line'; position:absolute; bottom:17px; left:60px;
  color:var(--color-text-tertiary); font-size:11px; pointer-events:none;
}
.chat-input-area .upload-btn {
  position:absolute; left:16px; bottom:13px; z-index:1; width:34px; height:34px;
  border:0; border-radius:10px; background:var(--color-bg-hover); font-size:20px;
}
.chat-input-area button#sendBtn {
  position:absolute; right:16px; bottom:13px; z-index:1; width:36px; min-width:36px; height:36px; min-height:36px; padding:0;
  border-radius:10px; background:var(--color-brand-subtle); color:var(--color-brand-primary); box-shadow:none; font-size:0;
}
.chat-input-area button#sendBtn::before { content:'↑'; font-size:21px; font-weight:500; line-height:1; }
.chat-input-area button#sendBtn:hover { transform:none; background:var(--color-brand-primary); color:#fff; box-shadow:none; }
.composer-menu {
  position:absolute; left:0; bottom:112px; z-index:20; width:190px; padding:6px;
  border:1px solid var(--color-border); border-radius:12px; background:var(--color-bg-elevated); box-shadow:var(--shadow-md);
}
.composer-menu[hidden] { display:none; }
.composer-menu button {
  width:100%; display:flex; align-items:center; padding:10px 12px; border:0; border-radius:8px;
  background:transparent; color:var(--color-text-primary); font:500 13px var(--font-family-sans); cursor:pointer; text-align:left;
}
.composer-menu button:hover { background:var(--color-bg-hover); }
/* Keep every composer control anchored to the input's bottom row. */
.chat-input-area::after {
  content:'Press Enter to send'; bottom:23px; left:108px;
}
.chat-input-area .mic-btn {
  position:absolute; right:60px; bottom:13px; z-index:1; width:34px; height:34px;
  margin:0; padding:0; border:0; border-radius:10px; background:var(--color-bg-hover);
  color:var(--color-text-secondary); font-size:16px; line-height:1;
}
.chat-input-area .mic-btn svg {
  width:18px; height:18px; fill:none; stroke:currentColor; stroke-width:1.8;
  stroke-linecap:round; stroke-linejoin:round;
}
.chat-input-area .mic-btn:hover { background:var(--color-brand-subtle); }
.chat-input-area .voice-wave { display:none; align-items:center; justify-content:center; gap:2px; height:18px; }
.chat-input-area .voice-wave i { width:2px; height:7px; border-radius:2px; background:currentColor; animation:voice-wave 700ms ease-in-out infinite alternate; }
.chat-input-area .voice-wave i:nth-child(2) { height:14px; animation-delay:120ms; }
.chat-input-area .voice-wave i:nth-child(3) { height:10px; animation-delay:260ms; }
.chat-input-area .voice-wave i:nth-child(4) { height:5px; animation-delay:380ms; }
.chat-input-area .mic-btn.recording { right:116px; background:var(--color-brand-subtle); color:var(--color-brand-primary); }
.chat-input-area .mic-btn.recording svg { display:none; }
.chat-input-area .mic-btn.recording .voice-wave { display:flex; }
.chat-input-area .voice-stop-btn {
  position:absolute; right:60px; bottom:13px; z-index:1; display:flex; align-items:center; gap:5px; height:34px;
  margin:0; padding:0 9px; border:0; border-radius:10px; background:var(--color-error); color:#fff;
  font:600 12px var(--font-family-sans); cursor:pointer;
}
.chat-input-area .voice-stop-btn[hidden] { display:none; }
.chat-input-area .voice-stop-btn span { width:9px; height:9px; border-radius:2px; background:currentColor; }
@keyframes voice-wave { from { transform:scaleY(.45); opacity:.55; } to { transform:scaleY(1); opacity:1; } }
.chat-messages { scrollbar-width:none; }
.chat-messages::-webkit-scrollbar { width:0; height:0; }
.mode-buttons { display:none !important; }
@media (max-width:700px) {
  .chat-input-area { width:calc(100% - 28px); }
  .chat-input-area input { height:96px; min-height:96px; }
  .chat-input-area::after { left:106px; bottom:22px; font-size:10px; }
}

@media (min-width:850px) {
  #app { padding-bottom:0 !important; }
  #tabBar {
    display:flex !important; position:fixed; top:50%; right:20px; bottom:auto; left:auto !important;
    width:76px; height:auto; min-height:0; padding:7px 6px; flex-direction:column; justify-content:initial; gap:4px;
    transform:translateY(-50%); border:1px solid #D5AD84; border-radius:18px;
    background:linear-gradient(145deg, #B88B65 0%, #8A6045 100%);
    box-shadow:inset 0 1px 0 rgba(255,255,255,.38), inset 0 -4px 10px rgba(71,39,22,.22), 0 12px 26px rgba(75,47,30,.25);
  }
  #app.with-sidebar #tabBar { left:auto !important; }
  #tabBar .tab-item {
    width:100%; min-height:58px; flex:none; padding:8px 4px; border-radius:12px;
    color:#3D1830; font-size:11px; font-weight:600; line-height:1.2; letter-spacing:0;
    text-shadow:0 1px 0 rgba(255,255,255,.18); transition:transform 160ms ease, background 160ms ease, box-shadow 160ms ease;
  }
  #tabBar .tab-item .tab-icon { font-size:20px; filter:drop-shadow(0 2px 2px rgba(63,35,25,.18)); }
  #tabBar .tab-item::after { display:none; }
  #tabBar .tab-item:hover { color:#2D1024; background:rgba(255,241,220,.15); transform:translateY(-1px); }
  #tabBar .tab-item.active {
    color:#40162F; background:linear-gradient(145deg, #C9BCE2, #A99AC7);
    border:1px solid rgba(255,255,255,.45); box-shadow:inset 0 2px 5px rgba(255,255,255,.32), 0 4px 10px rgba(58,31,45,.22);
  }
  .conversation-sidebar { bottom:0; transform:translateX(0); }
  .conversation-sidebar:not(.open) { transform:translateX(-100%); }
  #app .page { padding-left:0; padding-right:112px; }
  #app.with-sidebar .page { padding-left:340px; padding-right:112px; }
  .close-sidebar-btn { display:flex; position:absolute; top:18px; right:14px; }
  .open-sidebar-btn { display:none; }
  #app:not(.with-sidebar) .open-sidebar-btn { display:flex; }
  .chat-input-area { flex-shrink:0; margin:0 auto 24px; padding:0 !important; }
}