:root{--bg:#0B0B14;--panel:#12121f;--panel2:#1a1a2b;--line:#272740;--text:#ECECF4;--muted:#9a9ab5;--violet:#7C3AED;--violet2:#9d5cff;--yellow:#FACC15;--err:#ff6b6b;--user:#2a2350;--radius:14px}
*{box-sizing:border-box}html,body{height:100%;margin:0}
body{font-family:"Segoe UI",system-ui,-apple-system,"Noto Sans Devanagari",sans-serif;background:var(--bg);color:var(--text);line-height:1.5}
.hidden{display:none!important}
button{font:inherit;cursor:pointer}
a{color:var(--violet2)}
.screen{min-height:100dvh}
/* login */
#login{display:flex;align-items:center;justify-content:center;padding:24px;background:radial-gradient(900px 500px at 50% -10%,rgba(124,58,237,.35),transparent 60%),var(--bg)}
.login-card{width:100%;max-width:440px;background:var(--panel);border:1px solid var(--line);border-radius:20px;padding:28px 26px;box-shadow:0 30px 80px rgba(0,0,0,.5)}
.brand{display:flex;align-items:center;gap:8px;font-weight:900;font-size:26px;letter-spacing:-.5px}
.brand .logo{width:34px;height:34px;border-radius:9px;background:var(--violet);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-size:22px}
.brand .ai{background:var(--yellow);color:#111;font-size:13px;padding:2px 8px;border-radius:999px}
.brand.small{font-size:18px}.brand.small .logo{width:26px;height:26px;font-size:17px;border-radius:7px}
.login-card h1{font-size:24px;margin:18px 0 6px}
.sub{color:var(--muted);margin:0 0 18px}
label{display:block;font-size:13px;color:var(--muted);margin:12px 0 6px}
input{width:100%;padding:13px 14px;border-radius:12px;border:1px solid var(--line);background:var(--panel2);color:var(--text);font-size:16px;outline:none}
input:focus{border-color:var(--violet)}
#key{font-family:ui-monospace,Consolas,monospace;letter-spacing:1px;text-transform:uppercase}
#loginBtn,.btn-primary{width:100%;margin-top:18px;padding:13px;border:0;border-radius:12px;background:var(--violet);color:#fff;font-weight:700;font-size:16px}
#loginBtn:disabled{opacity:.6}
.err{color:var(--err);font-size:14px;margin-top:10px;min-height:20px}
.buy{margin:16px 0 6px;font-size:14px;color:var(--muted)}
.perks{margin:10px 0 0;padding-left:18px;color:var(--muted);font-size:14px}
/* app */
#app{display:flex;height:100dvh}
#side{width:280px;flex:none;background:var(--panel);border-right:1px solid var(--line);display:flex;flex-direction:column}
.side-top{padding:16px 14px 8px}
.side-top .btn-primary{margin-top:14px;padding:11px}
#convList{flex:1;overflow:auto;padding:6px 8px}
.conv{display:flex;align-items:center;gap:8px;padding:10px 10px;border-radius:10px;color:var(--text);background:transparent;border:0;width:100%;text-align:left;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:14px}
.conv:hover{background:var(--panel2)}.conv.active{background:var(--panel2);box-shadow:inset 3px 0 0 var(--violet)}
.side-bottom{padding:12px 14px 16px;border-top:1px solid var(--line);display:flex;flex-direction:column;gap:8px}
.usage .row{display:flex;justify-content:space-between;font-size:13px}
.row{display:flex;justify-content:space-between;align-items:center}
.tiny{font-size:12px;color:var(--muted)}
.bar{height:6px;background:var(--panel2);border-radius:999px;overflow:hidden;margin:6px 0}
.bar div{height:100%;background:linear-gradient(90deg,var(--violet),var(--violet2));width:0;transition:width .4s}
.bar div.warn{background:var(--yellow)}.bar div.full{background:var(--err)}
.link{background:none;border:0;color:var(--violet2);padding:0;text-decoration:none}
#main{flex:1;display:flex;flex-direction:column;min-width:0}
#topbar{display:flex;align-items:center;gap:10px;padding:10px 14px;border-bottom:1px solid var(--line);background:var(--panel)}
#menuBtn{display:none;background:none;border:0;color:var(--text);font-size:22px}
#convTitle{flex:1;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
#messages{flex:1;overflow:auto;padding:18px 0 10px;scroll-behavior:smooth}
#welcome{max-width:720px;margin:40px auto;padding:0 18px;text-align:center}
#welcome h2{font-size:26px;margin-bottom:18px}
.chips{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.chip{background:var(--panel);border:1px solid var(--line);color:var(--text);padding:12px;border-radius:12px;text-align:left;font-size:14px}
.chip:hover{border-color:var(--violet)}
.msg{max-width:780px;margin:0 auto 14px;padding:0 18px;display:flex;gap:10px}
.msg .av{width:30px;height:30px;border-radius:8px;flex:none;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:14px}
.msg.user .av{background:var(--user);color:#cbb8ff}.msg.model .av{background:var(--violet);color:#fff}
.msg .body{flex:1;min-width:0;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:12px 14px;overflow-wrap:anywhere}
.msg.user .body{background:var(--user);border-color:transparent}
.body p{margin:0 0 8px}.body p:last-child{margin:0}
.body ul,.body ol{margin:4px 0 8px;padding-left:22px}
.body pre{background:#0a0a12;border:1px solid var(--line);border-radius:10px;padding:10px 12px;overflow:auto;font-size:13px;margin:6px 0}
.body code{font-family:ui-monospace,Consolas,monospace;font-size:.92em;background:#0a0a12;padding:1px 5px;border-radius:5px}
.body pre code{padding:0;background:none}
.body h1,.body h2,.body h3{font-size:1.05em;margin:8px 0 4px}
.body table{border-collapse:collapse;margin:6px 0;font-size:14px}.body td,.body th{border:1px solid var(--line);padding:4px 8px}
.cursor::after{content:"▍";animation:blink 1s infinite;color:var(--violet2)}
@keyframes blink{50%{opacity:0}}
.msg .tools{display:flex;gap:10px;margin-top:6px}
.msg .tools button{background:none;border:0;color:var(--muted);font-size:12px;padding:0}
#composer{display:flex;gap:10px;padding:12px 16px 16px;border-top:1px solid var(--line);background:var(--panel)}
#input{flex:1;resize:none;max-height:180px;padding:12px 14px;border-radius:12px;border:1px solid var(--line);background:var(--panel2);color:var(--text);font:inherit;font-size:16px;outline:none}
#input:focus{border-color:var(--violet)}
#send{width:48px;border:0;border-radius:12px;background:var(--violet);color:#fff;font-size:18px}
#send:disabled{opacity:.5}
.notice{margin:0 16px 12px;padding:10px 14px;border-radius:10px;background:#3a2a00;color:var(--yellow);font-size:14px}
.notice.error{background:#3a1515;color:#ffb3b3}
.notice a{color:inherit;font-weight:700}
@media (max-width:760px){
  #side{position:fixed;inset:0 auto 0 0;z-index:20;transform:translateX(-100%);transition:transform .25s;width:min(300px,85vw)}
  #side.open{transform:none;box-shadow:0 0 0 100vw rgba(0,0,0,.5)}
  #menuBtn{display:block}
  .chips{grid-template-columns:1fr}
  .login-card{padding:22px 18px}
}