:root{--bg:#f2f3f7;--card:#ffffff;--txt:#111111;--muted:#6b7280;--pri:#0a84ff;--border:#e5e7eb;--shadow:0 8px 30px rgba(17,24,39,.08);--borderAdminGreen:#34c759;--borderSystemBlue:#0a84ff;--delBlue:#eef4ff;--delBorder:#cfe0ff}*{box-sizing:border-box}html,body{height:100vh;margin:0;background:var(--bg);color:var(--txt);overflow:hidden;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}.app{display:flex;flex-direction:column;height:100%;width:100%;overflow:hidden}.card{background:var(--card);border-radius:12px;padding:12px;box-shadow:var(--shadow)}.muted{color:var(--muted);font-size:12px}.top{padding:8px;display:flex;gap:8px;align-items:center}.title{font-weight:700;font-size:16px}#app{height:100vh}.panel.active,.work,.list,.history{min-height:0}.work{position:relative;flex:1 1 auto;padding:8px;overflow:hidden;min-height:0}.panel{position:absolute;top:8px;right:8px;bottom:8px;left:8px;display:none;min-height:0}.panel.active{display:flex;flex-direction:column;min-height:0}.panel-head{flex:0 0 auto;margin-bottom:8px}.list{flex:1 1 auto;overflow:auto;border:1px solid var(--border);border-radius:10px;padding:8px;background:var(--card);min-height:0}.item{display:flex;align-items:center;gap:10px;padding:10px;border-radius:12px;cursor:pointer}.item:hover{background:#0000000a}.item.active{background:#eef4ff;border:1px solid #cfe0ff}.item .name{font-weight:800;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.item .sub{font-size:12px;color:var(--muted);margin-top:2px}.chat-header{flex:0 0 auto;display:flex;align-items:center;justify-content:space-between;gap:10px;padding:0;margin-bottom:8px;background:transparent}.chat-header-left{flex:1 1 auto;min-width:0;height:40px;display:flex;align-items:center;padding:0 12px;border-radius:999px;background:var(--card);border:1px solid var(--border);box-shadow:0 6px 18px #1118270f}.chat-header-text{font-weight:800;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.icon-btn{width:40px;height:40px;border-radius:50%;background:#fff;border:1px solid var(--border);color:var(--txt);cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:18px;line-height:1;box-shadow:0 6px 18px #1118270f}.icon-btn:active{transform:scale(.92)}.history{flex:1 1 auto;overflow:auto;border:1px solid var(--border);border-radius:10px;padding:8px;background:var(--card);min-height:0}.bubble{position:relative;display:inline-block;max-width:80%;padding:10px 10px 8px;border-radius:12px;background:#fff;margin:6px 0;border:2px solid transparent;box-shadow:0 6px 18px #1118270f;overflow-wrap:anywhere;word-break:break-word}.bubble.me{border-color:var(--borderAdminGreen)}.bubble.other{border-color:var(--borderSystemBlue)}.bubble.is-deleted{background:var(--delBlue)!important;border-color:var(--delBorder)!important}.bubble .meta{font-size:11px;color:#1111118c;margin-top:6px}.composer{flex:0 0 auto;display:flex;gap:8px;margin-top:8px;align-items:flex-end}.composer textarea{flex:1 1 auto;padding:10px 12px;border-radius:20px;border:1px solid var(--border);background:#fff;color:var(--txt);font-family:inherit;font-size:14px;line-height:18px;resize:none;overflow:hidden;min-height:40px;max-height:140px}.btn-mini{border:1px solid var(--border);background:#fff;color:var(--txt);border-radius:10px;padding:8px 10px;cursor:pointer;font-weight:800}.btn-mini:active{transform:scale(.92)}