:root{--primary-color:#2e7d32;--fpt-orange:#f58020;--bg-color:#f1f8e9}.container{background:#fff;border-radius:20px;flex-direction:column;max-width:500px;height:85vh;margin:20px auto;font-family:Arial,sans-serif;display:flex;overflow:hidden;box-shadow:0 8px 30px #0000001a}.header{background:var(--primary-color);color:#fff;text-align:center;border-bottom:4px solid var(--fpt-orange);padding:15px}.chat-box{background:#fafafa;flex-direction:column;flex:1;gap:12px;padding:20px;display:flex;overflow-y:auto}.message-row{width:100%;display:flex}.message-row.user{justify-content:flex-end}.message-row.bot{justify-content:flex-start}.message-bubble{border-radius:18px;max-width:75%;padding:10px 15px;font-size:.95rem;line-height:1.4}.user .message-bubble{background:var(--primary-color);color:#fff;border-bottom-right-radius:2px}.bot .message-bubble{color:#333;background:#eee;border-bottom-left-radius:2px}.sender{margin-bottom:3px;font-size:.7rem;font-weight:700;display:block}.input-area{background:#fff;border-top:1px solid #eee;gap:8px;padding:15px;display:flex}input{border:1px solid #ddd;border-radius:20px;outline:none;flex:1;padding:10px 15px}button{background:var(--fpt-orange);color:#fff;cursor:pointer;border:none;border-radius:20px;padding:0 15px;font-weight:700}button:hover{opacity:.9}body{background-color:#f1f5f9;margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}