:root{--navy:#10243e;--ink:#162337;--muted:#6e7a8a;--paper:#f5f7fa;--white:#fff;--teal:#00a89c;--teal-dark:#007e76;--line:#dfe5ec;--shadow:0 24px 70px rgba(16,36,62,.16)}*{box-sizing:border-box}html,body{margin:0;min-height:100%;font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ink);background:var(--paper)}button,input,textarea{font:inherit}.login-shell{display:grid;place-items:center;min-height:100vh;padding:24px;background:radial-gradient(circle at 20% 0,#d8f2ef 0,transparent 30%),linear-gradient(145deg,#f8fafc,#e8edf3)}.login-card{width:min(440px,100%);padding:48px;border:1px solid rgba(255,255,255,.8);border-radius:28px;background:rgba(255,255,255,.92);box-shadow:var(--shadow);backdrop-filter:blur(16px)}.brand-mark{display:grid;place-items:center;width:58px;height:58px;border-radius:17px;background:linear-gradient(145deg,var(--teal),var(--teal-dark));box-shadow:0 10px 25px rgba(0,168,156,.25);color:white;font-size:28px;font-weight:800}.brand-mark.small{width:38px;height:38px;border-radius:11px;font-size:19px}.eyebrow{margin:30px 0 8px;color:var(--teal-dark);font-size:12px;font-weight:800;letter-spacing:.16em;text-transform:uppercase}.login-card h1{margin:0;font-size:40px;letter-spacing:-.04em}.intro{margin:12px 0 30px;color:var(--muted);line-height:1.6}.login-form{display:grid;gap:18px}.login-form label{display:grid;gap:8px;font-size:13px;font-weight:700}.login-form input{width:100%;padding:14px 16px;border:1px solid var(--line);border-radius:12px;outline:0;background:#fbfcfd}.login-form input:focus{border-color:var(--teal);box-shadow:0 0 0 3px rgba(0,168,156,.12)}.login-form button,.new-chat{border:0;border-radius:12px;background:var(--navy);color:white;font-weight:750;cursor:pointer}.login-form button{margin-top:4px;padding:15px}.login-form button:hover{background:#183454}.privacy{margin:24px 0 0;color:#8a94a2;font-size:12px;line-height:1.5}.alert{margin-bottom:18px;padding:12px 14px;border-radius:10px;background:#fff1f1;color:#9b3030;font-size:13px}.app-shell{display:grid;grid-template-columns:285px 1fr;height:100vh;overflow:hidden}.sidebar{display:flex;flex-direction:column;min-width:0;padding:22px 16px;background:var(--navy);color:white}.sidebar-brand{display:flex;align-items:center;gap:12px;padding:0 8px 22px;font-size:20px}.new-chat{padding:12px 14px;border:1px solid rgba(255,255,255,.17);background:rgba(255,255,255,.08);text-align:left}.new-chat:hover{background:rgba(255,255,255,.14)}#conversation-list{display:flex;flex:1;flex-direction:column;gap:4px;margin:18px 0;overflow-y:auto}#conversation-list button{padding:11px 12px;overflow:hidden;border:0;border-radius:9px;background:transparent;color:#c9d4df;cursor:pointer;text-align:left;text-overflow:ellipsis;white-space:nowrap}#conversation-list button:hover,#conversation-list button.active{background:rgba(255,255,255,.1);color:white}.account{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:15px 8px 0;border-top:1px solid rgba(255,255,255,.12);font-size:13px}.account form{margin:0}.account button{border:0;background:none;color:#9eb0c2;cursor:pointer;font-size:12px}.chat-panel{display:grid;grid-template-rows:auto 1fr auto;min-width:0;height:100vh;background:white}.chat-panel header{display:flex;align-items:center;gap:16px;padding:18px 28px;border-bottom:1px solid var(--line)}.chat-panel header h1{margin:0;font-size:18px}.chat-panel header p{margin:3px 0 0;color:var(--muted);font-size:12px}.status{display:flex;align-items:center;gap:7px;margin-left:auto;color:var(--muted);font-size:12px}.status i{width:7px;height:7px;border-radius:50%;background:#28b681}.menu{display:none;border:0;background:none;font-size:22px}.messages{overflow-y:auto;padding:38px max(24px,calc((100% - 820px)/2))}.welcome{display:grid;place-items:center;height:100%;align-content:center;text-align:center}.welcome h2{margin:22px 0 6px;font-size:29px;letter-spacing:-.03em}.welcome p{margin:0;color:var(--muted)}.message{display:grid;grid-template-columns:38px minmax(0,1fr);gap:13px;margin-bottom:24px}.message .avatar{display:grid;place-items:center;width:36px;height:36px;border-radius:10px;background:var(--teal);color:white;font-size:12px;font-weight:800}.message.user .avatar{background:#e9edf2;color:var(--ink);font-size:10px}.bubble{padding:7px 4px;line-height:1.65;overflow-wrap:anywhere}.message.user .bubble{font-weight:550}.typing{display:flex;gap:5px;padding-top:8px}.typing i{width:7px;height:7px;border-radius:50%;background:#8b99a8;animation:pulse 1.2s infinite}.typing i:nth-child(2){animation-delay:.15s}.typing i:nth-child(3){animation-delay:.3s}@keyframes pulse{0%,60%,100%{opacity:.3;transform:translateY(0)}30%{opacity:1;transform:translateY(-3px)}}.composer{position:relative;width:min(820px,calc(100% - 48px));margin:0 auto 22px;padding:11px 62px 28px 15px;border:1px solid var(--line);border-radius:18px;background:white;box-shadow:0 12px 36px rgba(16,36,62,.1)}.composer textarea{display:block;width:100%;max-height:180px;resize:none;border:0;outline:0;line-height:1.5}.composer>button{position:absolute;right:12px;top:10px;width:38px;height:38px;border:0;border-radius:11px;background:var(--teal);color:white;cursor:pointer;font-size:21px}.composer small{position:absolute;bottom:8px;left:15px;color:#99a2ad;font-size:10px}@media(max-width:760px){.app-shell{display:block}.sidebar{position:fixed;z-index:10;inset:0 auto 0 0;width:285px;transform:translateX(-100%);transition:.2s;box-shadow:var(--shadow)}.sidebar-open .sidebar{transform:none}.chat-panel header{padding:14px 18px}.menu{display:block}.messages{padding:25px 18px}.composer{width:calc(100% - 24px);margin-bottom:12px}.status{display:none}}