:root{--prom-blu: #0A419B;--prom-azzurro: #3795C3;--prom-verde: #34CB6F;--prom-grigio-scuro: #414042;--prom-border: #e5e7eb;--sidebar-width: 260px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:#fff;color:var(--prom-grigio-scuro)}.app{display:flex;height:100vh}.sidebar{width:var(--sidebar-width);background:#f9fafb;border-right:1px solid var(--prom-border);display:flex;flex-direction:column;flex-shrink:0;transition:margin-left .2s}.sidebar.closed{margin-left:calc(-1 * var(--sidebar-width))}.sidebar-header{display:flex;gap:8px;padding:12px;border-bottom:1px solid var(--prom-border)}.new-chat-btn{flex:1;padding:8px 12px;background:var(--prom-azzurro);color:#fff;border:none;border-radius:8px;cursor:pointer;font-size:14px;font-weight:500}.new-chat-btn:hover{background:var(--prom-blu)}.toggle-btn{background:none;border:none;cursor:pointer;font-size:18px;color:#999;padding:4px 8px}.session-list{flex:1;overflow-y:auto;padding:8px}.session-item{display:flex;align-items:center;padding:10px 12px;border-radius:8px;cursor:pointer;margin-bottom:2px;transition:background .1s}.session-item:hover{background:#eef1f5}.session-item.active{background:#e3edf7}.session-title{flex:1;font-size:13px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.delete-btn{background:none;border:none;cursor:pointer;font-size:12px;opacity:0;padding:2px 4px}.session-item:hover .delete-btn{opacity:.5}.delete-btn:hover{opacity:1!important}.main{flex:1;display:flex;flex-direction:column;min-width:0}.header{display:flex;align-items:center;padding:12px 24px;background:var(--prom-blu);color:#fff;flex-shrink:0;gap:12px}.menu-btn{background:none;border:none;color:#fff;font-size:20px;cursor:pointer;padding:0 8px}.header-title{font-size:18px;font-weight:600;flex:1}.header-user{display:flex;align-items:center;gap:12px;font-size:13px;opacity:.9}.sign-out-btn{background:#ffffff26;border:1px solid rgba(255,255,255,.3);color:#fff;padding:4px 12px;border-radius:6px;cursor:pointer;font-size:12px}.sign-out-btn:hover{background:#ffffff40}.chat-area{flex:1;overflow-y:auto}.welcome{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;padding:40px 20px;text-align:center}.welcome h1{font-size:28px;color:var(--prom-blu);margin-bottom:8px}.welcome p{font-size:16px;color:#666;line-height:1.6;margin-bottom:32px}.suggestions{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;max-width:700px}.suggestion-chip{background:#fff;border:1.5px solid var(--prom-azzurro);color:var(--prom-azzurro);padding:10px 18px;border-radius:24px;cursor:pointer;font-size:14px;transition:all .15s}.suggestion-chip:hover{background:var(--prom-azzurro);color:#fff}.messages{max-width:800px;margin:0 auto;padding:24px 20px 120px}.message{display:flex;gap:12px;margin-bottom:24px}.message.user{justify-content:flex-end}.message.user .bubble{background:var(--prom-blu);color:#fff;border-radius:18px 18px 4px;padding:12px 18px;max-width:70%}.message.user .bubble p{margin:0}.message.assistant{justify-content:flex-start}.message.assistant .bubble{background:#f7f8fa;border-radius:18px 18px 18px 4px;padding:16px 20px;max-width:85%;line-height:1.6;font-size:15px}.avatar{width:32px;height:32px;border-radius:50%;background:var(--prom-verde);display:flex;align-items:center;justify-content:center;font-size:16px;flex-shrink:0;margin-top:4px}.message.assistant .bubble h1,.message.assistant .bubble h2,.message.assistant .bubble h3{margin:16px 0 8px;color:var(--prom-blu)}.message.assistant .bubble p{margin:8px 0}.message.assistant .bubble ul,.message.assistant .bubble ol{margin:8px 0 8px 20px}.message.assistant .bubble code{background:#e8ecf0;padding:2px 6px;border-radius:4px;font-size:.9em}.message.assistant .bubble pre{background:#1e1e2e;color:#cdd6f4;padding:14px;border-radius:8px;overflow-x:auto;margin:12px 0;font-size:13px}.message.assistant .bubble pre code{background:none;padding:0;color:inherit}.message.assistant .bubble table{border-collapse:collapse;width:100%;margin:12px 0}.message.assistant .bubble th,.message.assistant .bubble td{border:1px solid var(--prom-border);padding:8px 12px;text-align:left;font-size:14px}.message.assistant .bubble th{background:#f7f8fa;font-weight:600}.message.assistant .bubble a{color:var(--prom-azzurro)}.typing-indicator{display:flex;gap:4px;padding:4px 0}.typing-indicator span{width:8px;height:8px;border-radius:50%;background:var(--prom-azzurro);animation:bounce 1.4s infinite ease-in-out both}.typing-indicator span:nth-child(1){animation-delay:-.32s}.typing-indicator span:nth-child(2){animation-delay:-.16s}@keyframes bounce{0%,80%,to{transform:scale(0)}40%{transform:scale(1)}}.error-bar{position:fixed;bottom:80px;left:50%;transform:translate(-50%);background:#fee;border:1px solid #fcc;color:#c00;padding:8px 16px;border-radius:8px;font-size:14px;display:flex;align-items:center;gap:12px;z-index:10}.error-bar button{background:none;border:none;color:#c00;cursor:pointer;font-size:16px}.input-bar{position:fixed;bottom:0;right:0;left:var(--sidebar-width);padding:16px 20px 24px;background:linear-gradient(transparent,#fff 20%);transition:left .2s}.sidebar.closed~.main .input-bar{left:0}.input-container{max-width:800px;margin:0 auto;display:flex;align-items:flex-end;gap:8px;background:#fff;border:2px solid var(--prom-border);border-radius:16px;padding:8px 8px 8px 16px;box-shadow:0 2px 12px #00000014;transition:border-color .15s}.input-container:focus-within{border-color:var(--prom-azzurro)}.input-container textarea{flex:1;border:none;outline:none;resize:none;font-size:15px;font-family:inherit;line-height:1.5;max-height:150px;padding:4px 0;background:transparent}.send-btn{width:36px;height:36px;border-radius:10px;background:var(--prom-azzurro);border:none;color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:background .15s}.send-btn:hover:not(:disabled){background:var(--prom-blu)}.send-btn:disabled{background:#ccc;cursor:not-allowed}.loading-screen{display:flex;align-items:center;justify-content:center;height:100vh;font-size:18px;color:#999}