/* First presentation slice. Shared palette is deliberately scoped to chat. */
.chat-pane {
  --chat-surface: #f8fafc;
  --chat-incoming: #ffffff;
  --chat-outgoing: #eaf2ff;
  --chat-ink: #0f172a;
  --chat-muted: #64748b;
  --chat-line: #e2e8f0;
  --chat-accent: #2563eb;
  background: var(--chat-surface);
}
[data-theme="dark"] .chat-pane {
  --chat-surface: #0b1220;
  --chat-incoming: #111c2e;
  --chat-outgoing: #183254;
  --chat-ink: #e8eef8;
  --chat-muted: #a0aec3;
  --chat-line: #293b54;
  --chat-accent: #93c5fd;
}
.chat-pane .chat-head {
  background: var(--chat-surface);
  border-bottom: 1px solid var(--chat-line);
  padding: 16px 24px;
}
.chat-pane .chat-head-title { font-size: 16px; letter-spacing: -.2px; }
.chat-pane .chat-head-sub { color: var(--chat-muted); line-height: 1.5; }
.chat-pane .chat-messages {
  background: var(--chat-surface);
  padding: 24px;
  gap: 16px;
  overscroll-behavior: contain;
}
.chat-pane .msg-bubble {
  background: var(--chat-incoming);
  color: var(--chat-ink);
  border: 1px solid var(--chat-line);
  box-shadow: none;
  border-radius: 14px;
  padding: 11px 15px;
}
.chat-pane .msg-row.mine .msg-bubble {
  background: var(--chat-outgoing);
  color: var(--chat-ink);
  border-color: transparent;
}
.chat-pane .msg-body { font-size: 15px; line-height: 1.55; }
.chat-pane .msg-meta, .chat-pane .msg-inline-meta { color: var(--chat-muted); }
.chat-pane .msg-body a, .chat-pane .msg-body .mention { color: var(--chat-accent); }
.chat-pane .msg-row.mine .attach-file { color: var(--chat-ink); background: var(--chat-incoming); }
.chat-pane .chat-composer {
  border-top: 0;
  background: var(--chat-surface);
  padding: 12px 24px max(18px, env(safe-area-inset-bottom));
}
.chat-pane .composer-row {
  background: var(--chat-incoming);
  border: 1px solid var(--chat-line);
  border-radius: 16px;
  padding: 7px;
  align-items: flex-end;
  gap: 6px;
  box-shadow: 0 3px 16px #00000005;
}
.chat-pane .composer-row:focus-within { border-color: var(--chat-accent); }
.chat-pane .composer-row .composer-input {
  min-width: 0;
  min-height: 44px;
  max-height: min(200px, 30dvh);
  background: transparent;
  color: var(--chat-ink);
  border: 0;
  border-radius: 0;
  box-shadow: none;
  padding: 11px 6px;
  font-size: 16px;
  line-height: 1.45;
}
.chat-pane #sendBtn {
  min-width: 64px;
  min-height: 44px;
  border-radius: 11px;
  background: #2563eb;
  color: #fff;
  font-size: 14px;
  padding: 10px 14px;
}
.chat-pane #sendBtn:hover { background: #1d4ed8; }
.chat-pane #attachBtn { min-width: 44px; min-height: 44px; border: 0; background: transparent; }
.chat-pane #sendBtn:focus-visible, .chat-pane #attachBtn:focus-visible {
  outline: 2px solid var(--chat-accent); outline-offset: 3px;
}
@media (max-width: 639px) {
  .chat-pane .chat-head { padding: 12px; }
  .chat-pane .chat-messages { padding: 16px 10px; gap: 12px; }
  .chat-pane .chat-composer { padding: 8px 10px max(10px, env(safe-area-inset-bottom)); }
  .chat-pane .msg-bubble { padding: 9px 12px; }
}
@media (prefers-reduced-motion: reduce) {
  .chat-pane .msg-actions, .chat-pane button { transition: none; }
}

/* Brand headings and shared primary controls across application modules. */
:root { --brand-heading: #071a3d; }
[data-theme="dark"] { --brand-heading: #e8eef8; }
h1, h2, h3, .chat-head-title, .conv-title { color: var(--brand-heading); }
.btn-primary { background: #2563eb; color: #fff; }
.btn-primary:hover { background: #1d4ed8; color: #fff; }

/* Workspace composition based on the owner's six-panel layout reference. */
.app-shell { background: var(--bg); }
.welcome-heading { font-size: clamp(30px,3.5vw,48px); letter-spacing: -1.5px; line-height: 1.12; margin: 24px 0 16px; }
.welcome-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 22px; }
.welcome-actions button { min-height: 56px; padding: 16px 24px; border-radius: 14px; }
.app-shell .empty-state { align-items: flex-start; text-align: left; padding: clamp(24px,5vw,72px); }
@media (min-width: 1024px) {
  .app-shell { padding: 16px; gap: 16px; }
  .app-shell .navrail { width: 144px; background: transparent; border: 0; align-items: stretch; padding: 10px 0; }
  .app-shell .navrail-group { align-items: stretch; width: 100%; }
  .app-shell .navrail-btn { width: 100%; display: flex; justify-content: flex-start; gap: 12px; padding: 12px; border-radius: 10px; }
  .app-shell .navrail-btn[title]::after { content: attr(title); font-size: 13px; font-weight: 500; white-space: nowrap; }
  .app-shell .navrail-btn svg { flex-shrink: 0; }
  .app-shell .sidebar { width: 280px; min-width: 280px; border: 1px solid var(--border); border-radius: 16px; overflow: hidden; }
  .app-shell .chat-pane { border-radius: 16px; border: 1px solid var(--border); overflow: hidden; }
  .app-shell .conv-list { padding: 8px; }
  .app-shell .conv-item { padding: 12px 10px; margin-bottom: 4px; }
}

/* First reference panel: welcome dashboard composition. */
.chats-panel-title { font-size: 17px; font-weight: 650; margin: 2px 0 14px; }
.app-shell .chat-pane:has(.welcome-dashboard) { background: transparent; border: 0; }
.app-shell .welcome-dashboard { position: relative; display: grid; grid-template-columns: minmax(0,1fr) 150px; align-items: center; gap: 24px; width: 100%; min-height: 100%; padding: 100px 32px 36px; }
.welcome-content { min-width: 0; }
.welcome-content .welcome-heading { font-size: clamp(30px,3.2vw,48px); margin-top: 0; }
.welcome-content > p { line-height: 1.55; color: var(--text-soft); }
.welcome-date { position: absolute; top: 20px; right: 24px; display: grid; gap: 4px; min-width: 175px; padding: 16px; border: 1px solid var(--border); border-radius: 14px; background: var(--bg-elev); font-size: 13px; }
.welcome-date span { font-size: 11px; color: var(--text-muted); }
.welcome-search { width: 100%; display:flex; align-items:center; justify-content:space-between; gap: 8px; margin: 24px 0 18px; padding: 13px; border: 1px solid var(--border); border-radius: 12px; color: var(--text-soft); background:var(--bg-elev); font-size:12px; text-align:left; }
.welcome-actions { display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); gap: 8px; margin:0; }
.welcome-actions button { display:flex; flex-direction:column; align-items:center; justify-content:center; gap:12px; padding:14px 4px; min-width:0; min-height:90px; background:var(--bg-elev); border:1px solid var(--border); color:var(--text); font-size:11px; }
.welcome-actions button span { display:grid; place-items:center; width:28px; height:28px; border-radius:8px; background:#2563eb; color:white; font-size:18px; }
.welcome-actions button:hover,.welcome-search:hover { border-color:var(--primary); background:var(--primary-soft); }
.welcome-actions button:focus-visible,.welcome-search:focus-visible { outline:2px solid var(--primary); outline-offset:3px; }
.welcome-quote { align-self:center; padding:28px 18px; min-height:190px; border:1px solid var(--border); border-radius:16px; background:var(--bg-elev); color:var(--text); line-height:1.6; }
.welcome-quote span { display:block; width:28px; height:3px; background:#2563eb; margin-top:24px; }
@media(max-width:1199px){ .app-shell .welcome-dashboard { grid-template-columns:1fr; padding:120px 24px 28px; } .welcome-quote{display:none;} }
@media(max-width:639px){ .welcome-actions { grid-template-columns:repeat(2,minmax(0,1fr)); } }

/* Owner-approved first-panel liquid-glass presentation. */
.app-shell {
  background: #cbd8ef url('/assets/alpine-dawn.png') center / cover no-repeat;
  --glass-surface: rgba(255,255,255,.72);
  --glass-border: rgba(255,255,255,.65);
  --glass-ink: #071a3d;
}
.app-shell .sidebar, .app-shell .navrail {
  background: var(--glass-surface);
  border-color: var(--glass-border);
  backdrop-filter: blur(22px) saturate(125%);
  -webkit-backdrop-filter: blur(22px) saturate(125%);
}
.app-shell .sidebar-head { background:transparent; border-bottom-color:var(--glass-border); }
.app-shell .welcome-dashboard { color:var(--glass-ink); }
.welcome-dashboard .welcome-heading, .welcome-dashboard .welcome-content > p { color:var(--glass-ink); }
.welcome-dashboard .welcome-date,
.welcome-dashboard .welcome-search,
.welcome-dashboard .welcome-actions button,
.welcome-dashboard .welcome-quote {
  background: var(--glass-surface);
  color:var(--glass-ink);
  border:1px solid var(--glass-border);
  backdrop-filter:blur(18px) saturate(130%);
  -webkit-backdrop-filter:blur(18px) saturate(130%);
  box-shadow:inset 0 1px 0 #ffffff80,0 8px 28px #243e6b0a;
}
.welcome-dashboard .welcome-date span { color:#475569; }
.welcome-dashboard .welcome-quote { background:rgba(20,43,75,.5); color:#fff; }
.welcome-dashboard .welcome-actions button:nth-child(2) span { background:#9333ea; }
.welcome-dashboard .welcome-actions button:nth-child(3) span { background:#15803d; }
@media(min-width:860px){
  .app-shell { padding:12px; gap:16px; }
  .app-shell .navrail { width:124px; border:0; align-items:stretch; padding:6px 0; border-radius:14px; }
  .app-shell .navrail-group { width:100%; align-items:stretch; }
  .app-shell .navrail-btn { width:100%; display:flex; justify-content:flex-start; gap:9px; padding:11px 9px; border-radius:9px; }
  .app-shell .navrail-btn[title]::after { content:attr(title); font-size:12px; font-weight:500; white-space:nowrap; }
  .app-shell .navrail-btn svg { flex-shrink:0; }
  .app-shell .sidebar { width:246px; min-width:246px; border-radius:14px; overflow:hidden; }
  .app-shell .chat-pane { border-radius:16px; overflow:hidden; }
  .app-shell .welcome-dashboard { padding:110px 16px 24px; }
}
@media(min-width:1200px){
  .app-shell .welcome-dashboard { grid-template-columns:minmax(0,1fr) 150px; padding:100px 24px 30px; }
}
[data-theme="dark"] .app-shell {
  background-image:linear-gradient(#08172e44,#08172e66),url('/assets/alpine-dawn.png');
  --glass-surface:rgba(15,29,50,.8);
  --glass-border:rgba(200,221,255,.24);
  --glass-ink:#f1f5fc;
}
[data-theme="dark"] .welcome-dashboard .welcome-date span { color:#bfccdf; }
@media(prefers-reduced-transparency:reduce){
  .app-shell { --glass-surface:#f1f5fc; }
  [data-theme="dark"] .app-shell { --glass-surface:#111c2e; }
  .app-shell .sidebar,.app-shell .navrail,.welcome-dashboard .welcome-date,.welcome-dashboard .welcome-search,.welcome-dashboard .welcome-actions button { backdrop-filter:none; }
}

.welcome-dashboard .welcome-content > p { display: inline-block; padding:8px 12px; margin-left:-12px; border-radius:10px; background:rgba(255,255,255,.7); }
[data-theme="dark"] .welcome-dashboard .welcome-content > p { background:rgba(15,29,50,.8); }

/* Compact rail and on-demand conversation picker. */
.workspace-more { position:relative; }
.workspace-more summary { cursor:pointer; list-style:none; display:grid; place-items:center; min-height:44px; color:var(--text); border-radius:10px; }
.workspace-more summary::-webkit-details-marker { display:none; }
.workspace-more-menu { position:absolute; left:calc(100% + 10px); top:0; min-width:190px; padding:8px; background:var(--bg-elev); border:1px solid var(--border); border-radius:14px; box-shadow:var(--shadow-lg); z-index:100; }
.app-shell .workspace-more-menu .navrail-btn { width:100%; justify-content:flex-start; gap:10px; }
.app-shell .workspace-more-menu .navrail-btn::after { content:attr(title); display:inline; font-size:13px; }
.chat-panel-close { display:none; }
@media(min-width:860px){
  .app-shell .navrail { width:56px; overflow:visible; }
  .app-shell .navrail > .navrail-group > .navrail-btn { justify-content:center; padding:11px; }
  .app-shell .navrail > .navrail-group > .navrail-btn::after { display:none; }
  .app-shell:not(.chats-expanded) > .sidebar { display:none; }
  .app-shell > .sidebar { position:relative; }
  .chat-panel-close { display:block; position:absolute; right:6px; top:70px; width:36px; height:36px; background:transparent; border:0; color:var(--text); border-radius:8px; z-index:2; }
  .welcome-dashboard .welcome-actions { grid-template-columns:repeat(2,minmax(0,130px)); }
  .app-shell .welcome-dashboard { padding-left:clamp(28px,6vw,100px); padding-right:40px; }
}

.private-chat-note { width:min(560px,calc(100vw - 24px)); padding:24px; border:1px solid var(--border); border-radius:18px; background:var(--bg-elev); color:var(--text); }
.private-chat-note::backdrop { background:#071a3d66; backdrop-filter:blur(3px); }
.private-chat-note h2 { font-size:20px; }
.private-chat-note textarea { width:100%; min-height:240px; max-height:50vh; padding:12px; background:var(--bg-soft); color:var(--text); border:1px solid var(--border); border-radius:10px; font:inherit; resize:vertical; }
.private-chat-note > div { display:flex; gap:10px; justify-content:flex-end; }
.private-chat-note [role=status] { min-height:24px; font-size:13px; }

/* Account popup is outside all overflow/blur stacking contexts. */
#userMenu { position:fixed; right:auto; bottom:auto; width:280px; min-width:0; max-width:calc(100vw - 16px); max-height:calc(100dvh - 16px); overflow-y:auto; z-index:10000; background:var(--bg-elev); color:var(--text); padding:8px; }
#userMenu .dropdown-head { align-items:center; min-width:0; }
#userMenu .dropdown-head > div:last-child { min-width:0; overflow-wrap:anywhere; }
#userMenu .dropdown-item { color:var(--text); background:transparent; white-space:normal; min-height:40px; }
#userMenu .dropdown-item:hover,#userMenu .dropdown-item:focus-visible { background:var(--bg-hover); }
.app-shell .sidebar-head .brand { min-width:0; flex:1; justify-content:center; }
.app-shell .sidebar-head .brand-image { max-width:100%; }
.app-shell .sidebar-head .brand-image img { max-width:100%; height:auto; object-fit:contain; }
.app-shell .sidebar-head .head-actions { flex-shrink:0; }
.chat-pane > .empty-state:not(.welcome-dashboard) { align-items:center; justify-content:center; text-align:center; }
.chat-pane .chat-head-info { min-width:0; }
.chat-pane .chat-head-title { overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }

@media(min-width:860px){ .welcome-dashboard .welcome-actions { grid-template-columns:repeat(3,minmax(0,130px)); } }

.background-settings img { display:block; width:100%; max-width:480px; height:160px; object-fit:cover; border-radius:12px; margin:12px 0; }

/* User-controlled rail expansion. */
.rail-expand-toggle { display:none; }
@media(min-width:860px){
  .rail-expand-toggle { display:flex; align-items:center; justify-content:center; width:44px; height:44px; min-height:44px; margin:0 auto 8px; border:0; border-radius:10px; background:transparent; color:var(--text); cursor:pointer; }
  .rail-expand-toggle:hover { background:var(--bg-hover); }
  .rail-expand-toggle:focus-visible { outline:2px solid var(--primary); outline-offset:2px; }
  .app-shell.navigation-expanded .navrail { width:160px; }
  .app-shell.navigation-expanded .navrail > .navrail-group > .navrail-btn { justify-content:flex-start; gap:10px; }
  .app-shell.navigation-expanded .navrail > .navrail-group > .navrail-btn::after { display:inline; content:attr(title); font-size:12px; }
  .app-shell.navigation-expanded .workspace-more summary::after { content:'More'; margin-left:10px; font-size:12px; }
  .app-shell.navigation-expanded .workspace-more summary { display:flex; align-items:center; justify-content:flex-start; padding:11px; }
}

.app-shell .navrail { cursor:pointer; }
.app-shell .navrail:focus-visible { outline:2px solid var(--primary); outline-offset:2px; }

.chat-pane .close-chat-btn { min-width:44px; min-height:44px; padding:4px; font-size:24px; flex-shrink:0; }

/* Floating workspace panels, with single-pane fallbacks for smaller screens. */
.workspace-companion { display:none; }
@media(min-width:1024px){
  .app-shell { align-items:stretch; padding:24px 16px; gap:18px; }
  .app-shell .sidebar { margin:8px 0; box-shadow:0 16px 48px #071a3d18,inset 0 1px 0 #ffffff90; }
  .app-shell .chat-pane:not(:has(.welcome-dashboard)) { margin:22px 0; border:8px solid rgba(236,241,255,.7); border-radius:22px; box-shadow:0 24px 65px #071a3d30,inset 0 1px 0 #ffffff90; min-height:0; background-clip:padding-box; }
  [data-theme="dark"] .app-shell .chat-pane:not(:has(.welcome-dashboard)) { border-color:rgba(80,104,145,.55); }
  .app-shell .chat-head { padding:12px 16px; }
}
@media(min-width:1280px){
  .workspace-companion { display:flex; flex-direction:column; gap:18px; width:220px; min-width:220px; padding:8px 0; overflow-y:auto; }
  .companion-card { padding:18px; border:1px solid var(--glass-border); border-radius:18px; background:var(--glass-surface); color:var(--glass-ink); backdrop-filter:blur(22px); box-shadow:0 12px 32px #071a3d12; }
  .companion-card h2 { font-size:15px; margin:0 0 10px; color:inherit; }
  .companion-card p { font-size:13px; line-height:1.5; }
  .companion-card .btn-secondary { width:100%; font-size:12px; min-height:44px; }
  .companion-actions { display:grid; grid-template-columns:1fr 1fr; gap:8px; }
  .companion-actions button { padding:12px 4px; min-height:48px; border-radius:10px; border:1px solid var(--border); background:var(--bg-elev); color:var(--text); font-size:12px; }
  .companion-actions button:hover { background:var(--primary-soft); }
  .companion-actions button:focus-visible { outline:2px solid var(--primary); outline-offset:2px; }
}
@media(max-width:1023px){ .app-shell .chat-pane { margin:0; } }

#workSearch { width:min(720px,calc(100vw - 24px)); }
#workSearch form { display:flex; gap:12px; align-items:end; }
#workSearch label { flex:1; }
#workSearch input { display:block; width:100%; padding:10px; background:var(--bg-soft); color:var(--text); border:1px solid var(--border); border-radius:8px; }
#workSearch .work-search-results { display:block; max-height:50vh; overflow-y:auto; margin-bottom:16px; }
.work-search-result { display:block; width:100%; text-align:left; padding:12px; border:1px solid var(--border); border-radius:10px; background:var(--bg-soft); color:var(--text); margin:8px 0; }
.work-search-result strong { font-size:12px; color:var(--text-muted); }
.work-search-result p { white-space:pre-wrap; overflow-wrap:anywhere; margin:8px 0 0; }

/* Keep the rail's popover above adjacent blurred panel stacking contexts. */
.app-shell > .navrail { position:relative; z-index:100; }
.app-shell .workspace-more-menu { background:var(--bg-elev); color:var(--text); opacity:1; max-height:calc(100dvh - 32px); overflow-y:auto; }
.app-shell .workspace-more-menu .navrail-btn { color:var(--text); opacity:1; min-height:44px; }
.welcome-dashboard .welcome-actions { grid-template-columns:minmax(0,160px); }