:root{
  --bg: #000; --panel: #0A0A0A; --panel-2: #0E0E0E; --text: #F5F5F5; --muted: #A6A6A6; --brand: #FFFFFF;
  --card: #0A0A0A; --shadow-sm: 0 6px 16px rgba(0,0,0,.35); --shadow-lg: 0 32px 60px rgba(0,0,0,.45);
  --border: #1C1C1C; --radius: 18px; --sidebar-w: 300px; --sidebar-w-collapsed: 76px;
  --header-h: 60px; --footer-h: 44px;
  --ease-primary: cubic-bezier(.25,.8,.25,1); --t-fast: .28s; --t-med: .35s; --fade: .14s;
  --footer-text: #A0A0A0; --safe-top: env(safe-area-inset-top); --safe-bottom: env(safe-area-inset-bottom);
  --svh: 100svh; --dvh: 100dvh; --vh: 1vh;
}
[data-theme="light"]{
  --bg: #FFFFFF; --panel: #FFFFFF; --panel-2: #F6F6F6; --text: #0B1220; --muted: #6B7280; --brand: #0B1220;
  --card: #FFFFFF; --shadow-sm: 0 6px 16px rgba(0,0,0,.06); --shadow-lg: 0 32px 60px rgba(0,0,0,.10);
  --border: #E5E7EB; --footer-text: #6B7280;
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body{
  margin: 0; font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Inter", "Segoe UI", Roboto, Helvetica, Arial;
  color: var(--text); background: var(--bg);
  display: grid; grid-template-rows: auto 1fr auto;
  min-height: var(--svh); min-height: var(--dvh); min-height: calc(var(--vh) * 100);
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
}
header{
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 clamp(12px, 2vw, 20px); background: color-mix(in oklab, var(--panel) 98%, transparent);
  border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 70;
  height: calc(var(--header-h) + var(--safe-top)); padding-top: var(--safe-top);
  backdrop-filter: saturate(1.1) blur(8px);
}
.brand{ display: inline-flex; align-items: center; gap: 12px; font-weight: 700; }
.brand .logo{ height: 26px; display: none; }
[data-theme="dark"] .brand .logo.logo-dark { display: block; }
[data-theme="light"] .brand .logo.logo-light { display: block; }
.controls{ display: inline-flex; gap: 6px; align-items:center; }
.btn, .icon-btn{
  border: 1px solid var(--border); background: var(--panel-2); color: var(--text);
  border-radius: 12px; cursor: pointer; font-weight: 600; text-decoration:none;
  height: 36px; display: inline-grid; place-items: center;
  transition: transform var(--t-fast) var(--ease-primary), background var(--t-fast) var(--ease-primary), box-shadow var(--t-fast) var(--ease-primary);
  touch-action: manipulation; user-select: none; -webkit-tap-highlight-color: transparent;
}
.btn:hover, .icon-btn:hover{ transform: translateY(-1px); box-shadow: var(--shadow-sm); }
.btn{ padding: 0 10px; } .icon-btn{ width: 36px; }
.icon-btn svg{ width: 18px; height: 18px; display:block; stroke: currentColor; fill: none; }
.mobile-menu{ display:none; margin-right: 8px; color: var(--text); }
@media (max-width: 1024px){ .mobile-menu{ display:inline-grid; } }
.wrap{
  display: grid; grid-template-columns: var(--sidebar-w) 1fr; gap: 0;
  height: calc(min(var(--svh), var(--dvh), calc(var(--vh) * 100)) - var(--header-h) - var(--footer-h) - var(--safe-top) - var(--safe-bottom));
  transition: grid-template-columns var(--t-med) var(--ease-primary); overflow: hidden;
}
body.collapsed .wrap{ grid-template-columns: var(--sidebar-w-collapsed) 1fr; }
aside{
  border-right: 1px solid var(--border); background: linear-gradient(180deg, color-mix(in oklab, var(--panel) 98%, transparent), color-mix(in oklab, var(--panel-2) 96%, transparent));
  padding: 14px 12px; overflow: auto; position: relative; -webkit-overflow-scrolling: touch; z-index: 60;
}
.side-top{ display:flex; align-items:center; gap:10px; margin: 4px 4px 10px; }
.plat-label{ color: var(--muted); font-size: 12px; letter-spacing: .12em; font-weight: 800; }
body.collapsed .plat-label{ display:none; }
.collapse-btn, .expand-btn{
  width: 34px; height: 34px; border-radius: 10px; border: 1px solid var(--border); background: var(--panel-2); color: var(--text);
  display: grid; place-items: center; cursor: pointer; box-shadow: var(--shadow-sm);
  transition: transform var(--t-fast) var(--ease-primary), background var(--t-fast) var(--ease-primary);
}
.collapse-btn:hover, .expand-btn:hover{ transform: translateY(-1px); }
.expand-btn{ display:none; } body.collapsed .collapse-btn{ display:none; } body.collapsed .expand-btn{ display:grid; }
.group-title{ margin: 14px 8px 6px; font-size: 11px; letter-spacing: .14em; color: var(--muted); opacity:.85; }
body.collapsed .group-title{ display:none; }
.nav{ display: grid; gap: 8px; }
.item{
  display: grid; grid-template-columns: 22px 1fr auto; align-items: center; gap: 12px; padding: 10px 12px; border-radius: 12px;
  color: var(--text); text-decoration: none; border: 1px solid transparent; background: transparent;
  transition: background var(--t-fast) var(--ease-primary), border-color var(--t-fast) var(--ease-primary), transform var(--t-fast) var(--ease-primary), opacity var(--t-fast) var(--ease-primary);
}
.item:hover{ background: color-mix(in oklab, var(--panel-2) 85%, transparent); border-color: var(--border); transform: translateY(-1px); }
.txt{ display: grid; } .title{ font-weight: 700; font-size: 14px; line-height: 1.1; } .tag{ font-size: 12px; color: var(--muted); }
body.collapsed .item{ grid-template-columns: 1fr; justify-items: center; gap: 10px; padding: 10px 0; }
body.collapsed .item .txt, body.collapsed .item .open{ display: none !important; }
body.collapsed .item .ico svg{ width: 20px; height: 20px; }
.item.aux{ border: 1px dashed var(--border); background: transparent; }
.item.aux:hover{ background: color-mix(in oklab, var(--panel-2) 80%, transparent); }
main{ padding: clamp(10px, 2vw, 20px); overflow: hidden; display: grid; place-items: start; }
.card{
  position: relative; width: 100%; height: 100%;
  border: 1px solid var(--border); background: var(--card);
  border-radius: var(--radius); box-shadow: var(--shadow-lg); overflow: visible; z-index: 10;
  will-change: transform; -webkit-mask-image: -webkit-radial-gradient(white, black);
}
#chat-frame, #content-frame{
  position: absolute; inset: 0; width: 100%; height: 100%; border: 0; background: transparent;
  opacity: 0; visibility: hidden; transition: opacity var(--fade) var(--ease-primary), visibility var(--fade) var(--ease-primary);
  border-radius: inherit; clip-path: inset(0 round var(--radius)); -webkit-mask-image: -webkit-radial-gradient(white, black);
  z-index: 0; pointer-events: none;
}
.show{ opacity: 1 !important; visibility: visible !important; pointer-events: auto !important; z-index: 2 !important; }
.fallback-open{ position: absolute; right: 12px; bottom: 12px; z-index: 5; border: 1px solid var(--border); background: var(--panel-2); color: var(--text);
  border-radius: 12px; padding: 8px 10px; cursor: pointer; display: none; }
.fallback-open.show{ display: inline-block; }
footer{ background: color-mix(in oklab, var(--panel) 98%, transparent); border-top: 1px solid var(--border); display: grid; place-items: center;
  font-size: 14px; color: var(--footer-text); height: calc(var(--footer-h) + var(--safe-bottom)); padding-bottom: var(--safe-bottom);
  backdrop-filter: saturate(1.1) blur(6px); }
footer a{ color: inherit; text-decoration: none; }
#loader{ position: fixed; inset: 0; display: grid; place-items: center; background: rgba(0,0,0,.94); color: #fff; z-index: 80;
  transition: opacity var(--t-med) var(--ease-primary), visibility var(--t-med) var(--ease-primary); }
[data-theme="light"] #loader{ background: rgba(244,246,251,.94); color: #0B1220; }
#loader.hide{ opacity: 0; visibility: hidden; pointer-events: none; }

.fab-menu{ position: fixed; left: 16px; bottom: calc(72px + var(--safe-bottom)); z-index: 65; width: 48px; height: 48px; border-radius: 16px; border:1px solid var(--border);
  background: var(--panel-2); align-items:center; justify-content:center; display:none; box-shadow: var(--shadow-lg); transition: transform var(--t-fast) var(--ease-primary); }
.fab-menu:active{ transform: scale(.98); }
.backdrop{ position: fixed; inset: calc(var(--header-h) + var(--safe-top)) 0 calc(var(--footer-h) + var(--safe-bottom)) 0; background: rgba(0,0,0,.45);
  z-index: 55; opacity: 0; pointer-events: none; transition: opacity var(--t-med) var(--ease-primary); }
.backdrop.open{ opacity: 1; pointer-events: auto; }
@media (prefers-reduced-motion: reduce){ *{ animation: none !important; transition: none !important; } }