#nhvk-chat-btn{position:fixed;bottom:24px;right:24px;z-index:1000;background:var(--nhvk-gold,#c9a84c);color:var(--nhvk-forest,#1e3320);border:none;border-radius:50px;padding:14px 22px;font-family:'Sarabun',sans-serif;font-size:14px;font-weight:700;cursor:pointer;box-shadow:0 4px 24px rgba(0,0,0,0.25);letter-spacing:0.5px;transition:transform 0.2s,background 0.2s;}
#nhvk-chat-btn:hover{transform:translateY(-2px);background:#e8c97a;}
#nhvk-chat-panel{position:fixed;bottom:80px;right:24px;z-index:1001;width:360px;max-width:calc(100vw - 32px);height:480px;max-height:calc(100vh - 120px);background:white;border-radius:12px;box-shadow:0 8px 40px rgba(0,0,0,0.2);display:none;flex-direction:column;overflow:hidden;border:1px solid #e8e3da;}
#nhvk-chat-panel.open{display:flex;}
#nhvk-chat-header{background:#1e3320;color:white;padding:14px 18px;font-family:'Cormorant Garamond',serif;font-size:18px;display:flex;justify-content:space-between;align-items:center;}
#nhvk-chat-close{background:none;border:none;color:rgba(255,255,255,0.7);font-size:22px;cursor:pointer;line-height:1;}
#nhvk-chat-messages{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:12px;}
.nhvk-msg{max-width:88%;padding:10px 14px;border-radius:10px;font-size:13px;line-height:1.55;font-weight:300;}
.nhvk-msg.user{align-self:flex-end;background:#2d4a2d;color:white;border-bottom-right-radius:2px;}
.nhvk-msg.bot{align-self:flex-start;background:#f5f0e8;color:#2a2a20;border-bottom-left-radius:2px;}
.nhvk-msg.thinking{align-self:flex-start;background:#e8ede4;color:#6a6a5a;font-style:italic;font-size:12px;}
.nhvk-msg.error{align-self:flex-start;background:#fff0f0;color:#8b3030;}
#nhvk-chat-form{display:flex;padding:12px;border-top:1px solid #eee;gap:8px;}
#nhvk-chat-input{flex:1;border:1px solid #ddd;border-radius:6px;padding:10px 12px;font-family:'Sarabun',sans-serif;font-size:13px;resize:none;height:42px;}
#nhvk-chat-send{background:#c9a84c;border:none;border-radius:6px;padding:0 16px;font-weight:700;cursor:pointer;color:#1e3320;font-size:13px;}
#nhvk-chat-send:disabled{opacity:0.5;cursor:not-allowed;}
#nhvk-chat-disclaimer{font-size:10px;color:#999;padding:0 14px 10px;text-align:center;}