:root{
  --yellow:#ffe600;
  --blue:#2d3277;
  --ink:#252525;
  --muted:#6b7280;
  --bg:#f4f5f7;
  --line:#e5e7eb;
  --white:#fff;
}
*{box-sizing:border-box}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--ink)}
button,input,textarea{font:inherit}
.login-shell{min-height:100vh;display:grid;place-items:center;padding:24px;background:linear-gradient(145deg,var(--yellow) 0 45%,var(--bg) 45%)}
.login-card{width:min(430px,100%);background:#fff;border-radius:22px;padding:34px;box-shadow:0 20px 55px rgba(0,0,0,.14)}
.brand-pill{display:inline-block;background:var(--yellow);color:var(--blue);font-weight:900;font-size:12px;padding:7px 11px;border-radius:999px;letter-spacing:.05em}
.login-card h1{font-size:34px;color:var(--blue);margin:14px 0 8px}.login-card p{color:var(--muted);line-height:1.5}
.login-form{display:grid;gap:10px;margin:26px 0}.login-form label{font-weight:700}.login-form input{border:1px solid var(--line);border-radius:12px;padding:14px}.login-form button,.composer button{border:0;background:var(--blue);color:#fff;font-weight:800;border-radius:12px;padding:13px 18px;cursor:pointer}.error{color:#b42318;font-size:14px}
.app-shell{max-width:1120px;margin:auto;padding:26px}.topbar{display:flex;justify-content:space-between;align-items:center;background:var(--yellow);border-radius:20px;padding:20px 24px;margin-bottom:18px}.topbar h1{margin:2px 0 0;color:var(--blue)}.eyebrow{font-size:11px;font-weight:900;letter-spacing:.07em;color:var(--blue)}.logout{color:var(--blue);font-weight:800;text-decoration:none}
.chat-card{background:#fff;border:1px solid var(--line);border-radius:22px;overflow:hidden;box-shadow:0 12px 30px rgba(0,0,0,.06)}
.hero{display:flex;gap:16px;align-items:center;padding:24px;border-bottom:1px solid var(--line)}.hero h2{margin:0 0 5px;color:var(--blue)}.hero p{margin:0;color:var(--muted)}.avatar{width:52px;height:52px;border-radius:16px;display:grid;place-items:center;background:var(--yellow);color:var(--blue);font-weight:900}
.quick-actions{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;padding:16px 20px;background:#fafafa;border-bottom:1px solid var(--line)}.quick-actions button{border:1px solid var(--line);background:#fff;color:var(--blue);padding:12px;border-radius:12px;font-weight:800;cursor:pointer}.quick-actions button:hover,.quick-actions button.active{background:var(--yellow);border-color:var(--yellow)}
.messages{min-height:360px;max-height:58vh;overflow:auto;padding:22px;background:#fcfcfc}.message{display:flex;margin:10px 0}.message.user{justify-content:flex-end}.bubble{max-width:min(760px,88%);white-space:pre-wrap;line-height:1.55;padding:13px 15px;border-radius:15px;background:#fff;border:1px solid var(--line)}.user .bubble{background:var(--blue);color:#fff;border-color:var(--blue)}.typing .bubble{color:var(--muted);font-style:italic}
.composer{padding:18px;border-top:1px solid var(--line);background:#fff}.composer textarea{width:100%;resize:vertical;border:1px solid var(--line);border-radius:14px;padding:14px;outline:none}.composer textarea:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(45,50,119,.09)}.composer-actions{display:flex;justify-content:space-between;align-items:center;margin-top:10px}.attach{cursor:pointer;color:var(--blue);font-weight:800}.composer button:disabled{opacity:.6;cursor:wait}.file-preview{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:8px}.file-preview span{font-size:12px;background:#f3f4f6;border-radius:999px;padding:6px 9px}
footer{text-align:center;color:var(--muted);font-size:12px;padding:16px}
@media(max-width:760px){.app-shell{padding:10px}.topbar{border-radius:14px}.quick-actions{grid-template-columns:1fr 1fr}.hero{align-items:flex-start}.messages{min-height:320px}.composer-actions{gap:10px}.attach{font-size:14px}}