:root{--bg:#f5f7fa;--fg:#222;--muted:#777;--line:#dde3ea;--pri:#2f6fed;--danger:#d64545;--card:#fff}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,-apple-system,"PingFang TC","Noto Sans TC",sans-serif;background:var(--bg);color:var(--fg)}
a{color:var(--pri)}
.topbar{display:flex;align-items:center;gap:16px;padding:8px 16px;background:var(--card);border-bottom:1px solid var(--line)}
.topbar-mid{flex:1;display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.brand{font-weight:700;text-decoration:none;color:var(--fg)}
.proj-title{font-weight:600}
.container{max-width:960px;margin:24px auto;padding:0 16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:24px}
.login-card{max-width:380px;margin:60px auto}
.login-card label{display:block;margin:12px 0}
.login-card input{width:100%;padding:8px;font-size:16px;border:1px solid var(--line);border-radius:6px}
.row{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.inline{display:inline}
.muted{color:var(--muted);font-size:.9em}
.error{color:var(--danger)}
.btn{padding:8px 14px;border:1px solid var(--line);background:#fff;border-radius:6px;cursor:pointer;font-size:15px;text-decoration:none;color:var(--fg)}
.btn:hover{background:#f0f3f7}
.btn:disabled{opacity:.5;cursor:default}
.btn-sm{padding:4px 10px;font-size:13px}
.btn-primary{background:var(--pri);color:#fff;border-color:var(--pri)}
.btn-primary:hover{background:#255ccc}
.btn-danger{color:var(--danger)}
.tag{padding:2px 8px;border-radius:12px;background:#eee;font-size:.85em;text-decoration:none;color:#555}
.tag-on{background:#dff5e3;color:#1d7a35}
.new-form{margin:12px 0 20px}
.new-form input{flex:1;padding:8px;font-size:16px;border:1px solid var(--line);border-radius:6px}
table.list{width:100%;border-collapse:collapse;background:var(--card);border:1px solid var(--line);border-radius:10px}
table.list th,table.list td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--line)}
table.list th{font-weight:600;color:var(--muted);font-size:.85em}
/* studio */
.studio-body{height:100vh;display:flex;flex-direction:column;overflow:hidden}
.studio{flex:1;display:grid;grid-template-columns:minmax(320px,38%) 1fr;min-height:0}
.chat-pane{display:flex;flex-direction:column;border-right:1px solid var(--line);background:var(--card);min-height:0}
.messages{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:10px}
.msg{display:flex;flex-direction:column;max-width:92%}
.msg-user{align-self:flex-end;align-items:flex-end}
.msg-assistant{align-self:flex-start}
.bubble{padding:10px 12px;border-radius:12px;white-space:pre-wrap;word-break:break-word;line-height:1.45;font-size:15px}
.msg-user .bubble{background:var(--pri);color:#fff;border-bottom-right-radius:3px}
.msg-assistant .bubble{background:#eef2f7;border-bottom-left-radius:3px}
.msg-pending .bubble{color:var(--muted);font-style:italic}
.meta{font-size:.75em;color:var(--muted);margin:2px 6px}
.hint{padding:8px}
.chat-form{border-top:1px solid var(--line);padding:10px 12px;display:flex;flex-direction:column;gap:8px}
.chat-form textarea{width:100%;padding:8px;font-size:15px;border:1px solid var(--line);border-radius:6px;resize:vertical;font-family:inherit}
.chat-form select{padding:4px;font-size:14px}
.preview-pane{display:flex;flex-direction:column;min-height:0}
.preview-bar{padding:6px 12px;border-bottom:1px solid var(--line);background:var(--card)}
#preview{flex:1;border:0;width:100%;background:#fff}
.modal{position:fixed;inset:0;background:rgba(0,0,0,.5);display:flex;align-items:center;justify-content:center;z-index:10}
.modal[hidden]{display:none}
.modal-box{background:#fff;padding:28px;border-radius:14px;text-align:center;max-width:90vw}
.modal-box h2{margin:0 0 12px}
#qr-img svg{width:min(60vw,360px);height:auto}
.big{font-size:1.3em;word-break:break-all}
@media (max-width:800px){.studio{grid-template-columns:1fr;grid-template-rows:1fr 1fr}.chat-pane{border-right:0;border-bottom:1px solid var(--line)}}