:root{--primary-color:#0077cc;--secondary-color:#6c757d;--background-color:#f8f9fa;--card-background:#ffffff;--text-color:#333;--light-text-color:#555;--border-color:#dee2e6;--font-family:'Noto Sans SC','Helvetica Neue',Helvetica,Arial,sans-serif;--border-radius:8px;--box-shadow:0 4px 12px rgba(0,0,0,0.08)}
body{margin:0;font-family:var(--font-family);background-color:var(--background-color);color:var(--text-color);line-height:1.6;display:flex;justify-content:center;align-items:flex-start;min-height:100vh;padding-top:20px;padding-bottom:80px}
.container{background-color:var(--card-background);border-radius:var(--border-radius);box-shadow:var(--box-shadow);padding:25px 30px;max-width:500px;width:90%;text-align:center;margin:20px;box-sizing:border-box}
.header{margin-bottom:25px;border-bottom:1px solid var(--border-color);padding-bottom:20px}
.header .logo{max-width:150px;margin-bottom:15px}
.header h1{color:var(--primary-color);margin:0 0 3px 0;font-size:22px;font-weight:500}
.header .subtitle{color:var(--light-text-color);margin:0;font-size:1.1em}
.content .instructions{color:var(--light-text-color);margin-bottom:20px;font-size:0.95em}
.qr-code-container{margin:25px auto;max-width:250px}
#qr-code-img{display:block;width:100%;height:auto;border:1px solid var(--border-color);border-radius:var(--border-radius);padding:5px;background:#fff}
.qr-hint{font-size:0.85em;color:var(--secondary-color);margin-top:10px}
.actions{margin-top:30px;display:flex;flex-direction:column;gap:15px;align-items:center}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 25px;font-size:1em;font-weight:400;border:none;border-radius:var(--border-radius);cursor:pointer;text-decoration:none;transition:background-color 0.3s ease,box-shadow 0.3s ease;width:100%;max-width:300px;box-sizing:border-box}
.btn svg{vertical-align:middle;margin-right:8px}
.btn-primary{background-color:var(--primary-color);color:white}
.btn-primary:hover{background-color:#005fa3;box-shadow:0 2px 5px rgba(0,0,0,0.15)}
.btn-secondary{background-color:transparent;color:var(--secondary-color);border:1px solid var(--border-color)}
.btn-secondary:hover{background-color:#f1f1f1;border-color:#bbb;color:#333}
.footer{margin-top:30px;padding-top:15px;border-top:1px solid var(--border-color);font-size:0.85em;color:var(--secondary-color)}
.ai-chat-popup{position:fixed;bottom:20px;right:20px;width:90%;max-width:350px;background-color:var(--card-background);border-radius:var(--border-radius);box-shadow:0 5px 15px rgba(0,0,0,0.15);display:flex;flex-direction:column;overflow:hidden;z-index:1000;transition:transform 0.3s ease-out,opacity 0.3s ease-out;opacity:1;transform:translateY(0)}
.ai-chat-popup.hidden{opacity:0;transform:translateY(20px);pointer-events:none}
.ai-chat-header{background-color:var(--primary-color);color:white;padding:10px 15px;display:flex;justify-content:space-between;align-items:center;font-weight:500}
.close-btn{background:none;border:none;color:white;font-size:1.5em;cursor:pointer;line-height:1}
.ai-chat-messages{flex-grow:1;height:300px;overflow-y:auto;padding:15px;background-color:#fdfdfd;border-bottom:1px solid var(--border-color)}
.message{margin-bottom:12px;padding:8px 12px;border-radius:var(--border-radius);max-width:85%;word-wrap:break-word;font-size:0.9em;line-height:1.5;box-sizing:border-box}
.message.user{background-color:#e1f5fe;color:#01579b;margin-left:auto;text-align:left;width:fit-content;min-width:30px}
.message.ai{background-color:#f1f3f5;color:#333;margin-right:auto}
.ai-chat-input-area{display:flex;padding:10px;background-color:#fff}
#ai-chat-input{flex-grow:1;padding:10px;border:1px solid var(--border-color);border-radius:var(--border-radius) 0 0 var(--border-radius);font-size:0.9em;outline:none}
#ai-chat-input:focus{border-color:var(--primary-color);box-shadow:0 0 0 2px rgba(0,119,204,0.2)}
.send-btn{padding:10px 15px;background-color:var(--primary-color);color:white;border:none;border-radius:0 var(--border-radius) var(--border-radius) 0;cursor:pointer;font-size:0.9em;transition:background-color 0.2s ease}
.send-btn:hover{background-color:#005fa3}
.thinking-indicator{padding:5px 15px;font-size:0.8em;color:var(--secondary-color);background-color:#f9f9f9;text-align:center}
.thinking-indicator.hidden{display:none}
@media (min-width:600px){.actions{flex-direction:row;justify-content:center}
.btn{width:auto}
}.typing-cursor{display:inline-block;width:2px;height:1em;background-color:#333;margin-left:1px;vertical-align:text-bottom;animation:blink 0.8s infinite}
@keyframes blink{0%,100%{opacity:1}
50%{opacity:0}
}.message.ai.error{background-color:#ffebee;color:#c62828;border-left:3px solid #c62828}
@media (max-width:480px){.container{padding:20px 15px;width:95%}
.header h1{font-size:18px}
.header .subtitle{font-size:1em}
.btn{padding:10px 20px;font-size:0.95em}
.ai-chat-popup{bottom:10px;right:10px;max-width:calc(100% - 20px)}
.ai-chat-messages{height:200px}
}