:root{--bg:#f7f5f0;--fg:#2d3748;--muted:#718096;--card:#fff;--primary:#2d5a3d;--primary-light:#4a7c59;--secondary:#1e3a2e;--accent:#e53e3e;--warning:#ed8936;--beige:#f7fafc;--beige-dark:#edf2f7;--border:#e2e8f0;--shadow:rgba(0,0,0,.08)}*{box-sizing:border-box}body,html{height:100%}body{margin:0;font-family:Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:linear-gradient(180deg,var(--bg) 0,var(--beige) 100%);color:var(--fg);font-weight:400}.chat-container{display:flex;flex-direction:column;height:100vh;max-width:800px;margin:0 auto}.chat-header{padding:1.5rem;text-align:center;border-bottom:2px solid var(--primary-light);background:var(--card);box-shadow:0 2px 10px var(--shadow);border-radius:0 0 8px 8px}.chat-header h1{margin:0 0 .5rem;font-size:2.2rem;font-weight:400;color:var(--primary);text-shadow:1px 1px 2px var(--shadow)}.chat-header p{margin:0;color:var(--muted);font-size:1.1rem;font-weight:400}.conversation-area{flex:1 1;overflow-y:auto;padding:1rem}.input-area{padding:1.5rem;border-top:2px solid var(--primary-light);background:var(--card);box-shadow:0 -2px 10px var(--shadow);border-radius:8px 8px 0 0}.conversation{display:flex;flex-direction:column;gap:1rem;max-width:100%}.welcome-message{text-align:center;color:var(--muted);font-style:italic;margin:2rem 0}.message{display:flex;max-width:80%;margin-bottom:.5rem}.message.user{align-self:flex-end;justify-content:flex-end}.message.assistant{align-self:flex-start;justify-content:flex-start}.message-content{padding:1rem 1.25rem;border-radius:8px;white-space:pre-wrap;line-height:1.6;word-wrap:break-word;font-weight:400;box-shadow:0 2px 8px var(--shadow)}.message.user .message-content{background:var(--primary);color:#fff;border-bottom-right-radius:4px}.message.assistant .message-content,.message.user .message-content{font-family:Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-weight:400}.message.assistant .message-content{background:var(--card);color:var(--fg);border:2px solid var(--border);border-bottom-left-radius:4px}.chat-form{position:relative}.input-container{display:flex;align-items:flex-end;gap:.75rem;background:var(--card);border:2px solid var(--border);border-radius:12px;padding:.75rem;box-shadow:0 4px 12px var(--shadow);transition:border-color .3s ease,box-shadow .3s ease}.input-container:focus-within{border-color:var(--primary);box-shadow:0 4px 16px rgba(72,187,120,.15)}.chat-input{flex:1 1;background:transparent;border:none;outline:none;color:var(--fg);font-family:Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:1.1rem;font-weight:400;padding:.75rem 1rem;resize:none;max-height:120px;min-height:24px}.chat-input::placeholder{color:var(--muted);font-weight:400}.send-button{background:var(--primary);border:none;border-radius:50%;width:44px;height:44px;display:flex;align-items:center;justify-content:center;cursor:pointer;color:#fff;transition:all .3s ease;box-shadow:0 2px 8px rgba(72,187,120,.2)}.send-button:hover:not(:disabled){background:var(--secondary);transform:scale(1.05);box-shadow:0 4px 12px rgba(72,187,120,.3)}.send-button:disabled{opacity:.6;cursor:not-allowed;transform:none}.loading-spinner{width:16px;height:16px;border:2px solid hsla(0,0%,100%,.3);border-top-color:#fff;border-radius:50%;animation:spin 1s linear infinite}.error-message{color:var(--accent);font-size:.9rem;font-weight:400;margin-top:.75rem;padding:.5rem 1rem;background:rgba(229,62,62,.1);border-radius:6px}.character-count{color:var(--muted);font-size:.8rem;font-weight:400;text-align:right;margin-top:.5rem;padding-right:1rem}.typing-indicator{opacity:.7;animation:pulse 1.5s ease-in-out infinite}.thinking-indicator{display:flex;align-items:center;gap:.75rem;color:var(--muted);font-style:italic;font-weight:400}.spinner{width:18px;height:18px;border-top:3px solid var(--border);border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin 1s linear infinite}.container{max-width:720px;margin:0 auto;padding:24px}.card{background:var(--card);border-radius:8px;padding:20px;box-shadow:0 4px 12px var(--shadow);border:2px solid var(--border)}.btn{background:var(--primary);color:#fff;border:0;padding:12px 18px;border-radius:6px;cursor:pointer;font-weight:400;font-family:Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;transition:all .3s ease;box-shadow:0 2px 8px var(--shadow)}.btn:hover{background:var(--secondary);transform:translateY(-2px);box-shadow:0 4px 12px var(--shadow)}.textarea{width:100%;min-height:120px;padding:16px;border-radius:8px;border:2px solid var(--border);background:var(--card);color:var(--fg);resize:vertical;font-family:Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-weight:400;transition:border-color .3s ease}.textarea:focus{border-color:var(--primary);outline:none}.stream{white-space:pre-wrap;line-height:1.7;font-weight:400}@keyframes pulse{0%,50%{opacity:1}51%,to{opacity:0}}@keyframes spin{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}