:root{color-scheme:light;--bg:#f4f6f8;--panel:#fff;--line:#d9dee5;--text:#17202a;--muted:#687384;--primary:#1457d9;--primary-dark:#0e3f9f;--success:#0b7a4b;--warning:#a15c00;--danger:#b42318}*{box-sizing:border-box}body,html{margin:0;min-height:100%;background:var(--bg);color:var(--text);font-family:Arial,Microsoft YaHei,sans-serif;letter-spacing:0}button,input,select,textarea{font:inherit}button{cursor:pointer}a{color:inherit;text-decoration:none}.shell{min-height:100vh;display:grid;grid-template-rows:auto 1fr}.topbar{height:58px;justify-content:space-between;padding:0 24px;border-bottom:1px solid var(--line);background:var(--panel)}.brand,.topbar{display:flex;align-items:center}.brand{gap:10px;font-weight:700}.nav{display:flex;align-items:center;gap:8px}.nav a,.primary-button,.secondary-button{min-height:36px;border-radius:6px;padding:0 14px;display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid var(--line);background:#fff;color:var(--text)}.primary-button{border-color:var(--primary);background:var(--primary);color:#fff}.primary-button:hover{background:var(--primary-dark)}.primary-button:disabled,.secondary-button:disabled{cursor:not-allowed;opacity:.55}.chat-layout{display:grid;grid-template-columns:minmax(0,1fr) 340px;min-height:calc(100vh - 58px)}.chat-main{display:grid;grid-template-rows:1fr auto;min-width:0}.messages{padding:24px;overflow-y:auto}.empty-state{height:100%;display:grid;place-items:center;text-align:center;color:var(--muted)}.message-row{display:flex;margin:0 0 14px}.message-row.user{justify-content:flex-end}.bubble{max-width:min(680px,78%);padding:12px 14px;border-radius:8px;line-height:1.55;border:1px solid var(--line);background:var(--panel);white-space:pre-wrap;word-break:break-word}.message-row.user .bubble{background:var(--primary);border-color:var(--primary);color:#fff}.composer{display:grid;grid-template-columns:minmax(0,1fr) auto;grid-gap:12px;gap:12px;padding:16px 24px 24px;border-top:1px solid var(--line);background:hsla(0,0%,100%,.75)}.composer textarea{min-height:54px;max-height:140px;resize:vertical;border:1px solid var(--line);border-radius:8px;padding:12px;outline:none}.composer textarea:focus{border-color:var(--primary)}.feedback-bar{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;grid-gap:10px;gap:10px;padding:0 24px 16px;background:hsla(0,0%,100%,.75)}.feedback-bar input,.status-select select{min-height:36px;border:1px solid var(--line);border-radius:6px;padding:0 10px;background:#fff;outline:none}.score-control{display:inline-flex;align-items:center;gap:2px}.star-button{width:30px;height:30px;display:inline-grid;place-items:center;border:none;background:transparent;color:var(--muted);padding:0}.star-button.active{color:var(--warning)}.side-panel{border-left:1px solid var(--line);background:var(--panel);padding:20px;display:flex;flex-direction:column;gap:18px}.panel-block{display:grid;grid-gap:8px;gap:8px}.label{color:var(--muted);font-size:13px}.value{font-size:18px;font-weight:700}.pill{width:-moz-fit-content;width:fit-content;display:inline-flex;align-items:center;min-height:28px;border-radius:999px;padding:0 10px;font-size:13px;border:1px solid var(--line);background:#f8fafc}.pill.danger{color:var(--danger);border-color:#f4b4ad;background:#fff4f2}.pill.success{color:var(--success);border-color:#a8dabc;background:#f0fbf4}.admin-page{padding:24px}.metrics-grid{display:grid;grid-template-columns:repeat(6,minmax(120px,1fr));grid-gap:12px;gap:12px;margin-bottom:20px}.metric-card{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:14px;display:grid;grid-gap:8px;gap:8px}.metric-card span{color:var(--muted);font-size:13px}.metric-card strong{font-size:22px}.admin-grid{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(320px,.8fr);grid-gap:20px;gap:20px}.section{background:var(--panel);border:1px solid var(--line);border-radius:8px;overflow:hidden}.section-header{padding:16px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between}.section-title{font-size:17px;font-weight:700}.conversation-list,.ticket-list{display:grid}.conversation-item,.ticket-item{padding:14px 16px;border-bottom:1px solid var(--line);display:grid;grid-gap:8px;gap:8px}.conversation-item:last-child,.ticket-item:last-child{border-bottom:none}.meta{display:flex;flex-wrap:wrap;gap:8px;color:var(--muted);font-size:13px}.transcript{display:grid;grid-gap:8px;gap:8px}.transcript-line{font-size:14px;line-height:1.5}.status-select{display:flex;flex-wrap:wrap;align-items:center;gap:8px;color:var(--muted);font-size:13px}.feedback-section{margin-top:20px}.error{color:var(--danger);font-size:14px}@media (max-width:860px){.admin-grid,.chat-layout{grid-template-columns:1fr}.side-panel{border-left:none;border-top:1px solid var(--line)}.composer,.feedback-bar,.metrics-grid{grid-template-columns:1fr}.bubble{max-width:92%}}