:root{
  --bg:#090a10;
  --panel:#11131d;
  --panel2:#171a27;
  --text:#f4f5ff;
  --muted:#a3a7bb;
  --line:#2b3044;
  --accent:#8c6cff;
  --accent2:#40d6b0;
  --danger:#ff5f73;
  --shadow:0 24px 80px rgba(0,0,0,.45);
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,Segoe UI,Arial,sans-serif;background:radial-gradient(circle at 15% 10%,rgba(140,108,255,.18),transparent 32%),radial-gradient(circle at 85% 5%,rgba(64,214,176,.12),transparent 28%),var(--bg);color:var(--text)}
a{color:var(--accent2);text-decoration:none}
.auth-body{display:grid;place-items:center;padding:26px}
.auth-shell{width:min(1050px,100%);display:grid;grid-template-columns:1.1fr .9fr;gap:22px}
.brand-panel,.auth-card,.sidebar,.chat-main{background:linear-gradient(180deg,rgba(255,255,255,.045),rgba(255,255,255,.015));border:1px solid var(--line);border-radius:28px;box-shadow:var(--shadow)}
.brand-panel{position:relative;overflow:hidden;min-height:540px;padding:44px;display:flex;flex-direction:column;justify-content:flex-end}
.brand-panel h1{font-size:56px;line-height:.95;margin:0 0 18px;letter-spacing:-2px}
.brand-panel p{font-size:18px;max-width:560px;color:var(--muted)}
.orb{position:absolute;top:55px;right:70px;width:210px;height:210px;border-radius:50%;background:radial-gradient(circle at 35% 35%,#fff, var(--accent) 25%, transparent 70%);filter:blur(.2px);opacity:.8}
.brand-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}.brand-tags span{border:1px solid var(--line);background:rgba(255,255,255,.05);padding:8px 12px;border-radius:999px;color:var(--muted)}
.auth-card{padding:34px;align-self:center}.auth-card h2{font-size:34px;margin:0 0 8px}.muted{color:var(--muted)}.small{font-size:13px}.alert{border:1px solid rgba(255,95,115,.4);background:rgba(255,95,115,.12);color:#ffd3d9;padding:12px;border-radius:14px;margin:14px 0}
form{display:grid;gap:14px}label{display:grid;gap:8px;color:var(--muted);font-size:13px}input,textarea{width:100%;border:1px solid var(--line);background:#0d0f18;color:var(--text);border-radius:14px;padding:12px 13px;outline:none;font:inherit}textarea{resize:vertical}input:focus,textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(140,108,255,.15)}
.btn{border:1px solid var(--line);background:var(--panel2);color:var(--text);border-radius:14px;padding:11px 14px;font-weight:700;cursor:pointer}.btn:hover{filter:brightness(1.12)}.btn.primary{background:linear-gradient(135deg,var(--accent),#5e8cff);border-color:transparent}.btn.danger{background:rgba(255,95,115,.12);border-color:rgba(255,95,115,.35);color:#ffd3d9}.btn.full{width:100%}.ghost-link{font-size:13px;color:var(--muted)}
.app-body{height:100vh;overflow:hidden}#app{height:100vh;display:grid;grid-template-columns:320px 1fr 340px;gap:14px;padding:14px}.sidebar{min-height:0;overflow:auto;padding:18px}.topline{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:16px}.topline strong{display:block}.topline span{display:block;color:var(--muted);font-size:12px}.sidebar h3{font-size:14px;color:var(--muted);letter-spacing:.08em;text-transform:uppercase;margin:22px 0 10px}.panel{border:1px solid var(--line);border-radius:18px;padding:12px;background:rgba(255,255,255,.025)}.panel summary{cursor:pointer;font-weight:800;margin-bottom:10px}.stack{display:grid;gap:12px}.grid2{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.list{display:grid;gap:8px}.list-item{width:100%;display:flex;gap:10px;align-items:center;text-align:left;border:1px solid var(--line);background:rgba(255,255,255,.025);color:var(--text);border-radius:16px;padding:10px;cursor:pointer}.list-item.active{border-color:var(--accent);background:rgba(140,108,255,.14)}.list-item strong,.list-item small{display:block}.list-item small{color:var(--muted);margin-top:3px;font-size:12px}.avatar{width:42px;height:42px;border-radius:14px;background:linear-gradient(135deg,var(--accent),var(--accent2));display:grid;place-items:center;font-weight:900;overflow:hidden;flex:0 0 auto}.avatar img{width:100%;height:100%;object-fit:cover}
.chat-main{min-width:0;min-height:0;display:grid;grid-template-rows:auto 1fr auto;overflow:hidden}.chat-header{display:flex;justify-content:space-between;align-items:center;gap:16px;border-bottom:1px solid var(--line);padding:18px 20px}.chat-header h2{margin:0;font-size:22px}.chat-header p{margin:4px 0 0;color:var(--muted);font-size:13px}.header-actions{display:flex;gap:8px}.messages{min-height:0;overflow:auto;padding:22px;display:flex;flex-direction:column;gap:14px}.msg{display:grid;grid-template-columns:54px minmax(0,1fr);gap:10px;align-items:start}.msg .role{font-size:12px;color:var(--muted);padding-top:10px}.bubble{border:1px solid var(--line);background:rgba(255,255,255,.035);padding:14px 15px;border-radius:18px;line-height:1.55;white-space:normal}.msg.user .bubble{background:rgba(140,108,255,.12);border-color:rgba(140,108,255,.3)}.msg.assistant .bubble{background:rgba(64,214,176,.07);border-color:rgba(64,214,176,.25)}.composer{border-top:1px solid var(--line);padding:14px;display:grid;grid-template-columns:1fr auto;gap:12px}.composer textarea{max-height:180px}.toast{position:fixed;left:50%;bottom:22px;transform:translateX(-50%);background:#191d2c;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:999px;padding:12px 16px;color:var(--text);z-index:10}
@media(max-width:1050px){#app{grid-template-columns:280px 1fr}.sidebar.right{display:none}.auth-shell{grid-template-columns:1fr}.brand-panel{min-height:300px}.brand-panel h1{font-size:42px}}
@media(max-width:760px){.app-body{overflow:auto}#app{height:auto;min-height:100vh;grid-template-columns:1fr}.sidebar.right{display:block}.chat-main{min-height:70vh}.composer{grid-template-columns:1fr}.auth-body{padding:12px}.auth-card,.brand-panel{border-radius:22px;padding:24px}}