.yku-chat-wrap{max-width:860px;margin:24px auto;border:1px solid #e5e7eb;border-radius:18px;overflow:hidden;background:#fff;box-shadow:0 10px 24px rgba(0,0,0,.06)}
.yku-chat-header{padding:18px 20px;background:linear-gradient(135deg,#111827,#1f2937);color:#fff}
.yku-chat-title{font-size:22px;font-weight:700}
.yku-chat-subtitle{margin-top:6px;font-size:14px;opacity:.88}
.yku-chat-messages{padding:18px;background:#f9fafb;min-height:320px;max-height:640px;overflow:auto}
.yku-msg{max-width:88%;padding:14px 16px;border-radius:16px;margin-bottom:14px;line-height:1.55;font-size:15px}
.yku-bot{background:#fff;border:1px solid #e5e7eb;color:#111827}
.yku-user{margin-left:auto;background:#111827;color:#fff}
.yku-chat-input-row{display:flex;gap:10px;padding:16px;border-top:1px solid #e5e7eb;background:#fff}
.yku-chat-input{flex:1;padding:14px 16px;border:1px solid #d1d5db;border-radius:14px;font-size:15px}
.yku-chat-send{padding:0 22px;border:0;border-radius:14px;background:#111827;color:#fff;font-weight:700;cursor:pointer}
.yku-answer h3{margin:0 0 8px;font-size:20px}
.yku-meta{color:#6b7280;font-size:13px;margin-bottom:12px}
.yku-box{background:#f9fafb;border:1px solid #e5e7eb;border-radius:12px;padding:12px 14px;margin:10px 0}
.yku-box p{margin:8px 0 0}
.yku-source{font-size:12px;color:#6b7280;margin-top:10px}
.yku-related ul,.yku-suggest ul,.yku-source-list{margin:10px 0 0 18px}
.yku-empty,.yku-suggest{padding:6px 2px}
.yku-suggest-box{padding:0 16px 8px;background:#fff}
.yku-chip{display:inline-block;margin:0 8px 8px 0;padding:8px 12px;border:1px solid #d1d5db;border-radius:999px;background:#f3f4f6;cursor:pointer}
@media (max-width:640px){.yku-chat-wrap{border-radius:14px}.yku-chat-input-row{flex-direction:column}.yku-chat-send{height:46px}.yku-msg{max-width:100%}}