:root{--bg:#f4f6fa;--card:#fff;--accent:#2e5a88;--accent2:#3a78c2;--line:#e2e8f0;--text:#1f2937;--muted:#6b7280;--danger:#dc3545;--ok:#138a4e}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,'Malgun Gothic','Apple SD Gothic Neo',sans-serif;background:var(--bg);color:var(--text);line-height:1.5}
a{color:var(--accent2);text-decoration:none}
.topbar{display:flex;align-items:center;gap:18px;background:linear-gradient(100deg,#23456e,#2e5a88 55%,#3a78c2);padding:13px 24px;position:sticky;top:0;z-index:10;box-shadow:0 2px 10px rgba(0,0,0,.08)}
.brand{font-weight:800;font-size:19px;color:#fff;letter-spacing:-.3px}
.topbar nav{display:flex;align-items:center;gap:18px;margin-left:auto;font-size:14px}
.topbar nav a{color:rgba(255,255,255,.85)}
.topbar nav a:hover{color:#fff}
.topbar nav .who{color:#fff;font-weight:600;border-left:1px solid rgba(255,255,255,.3);padding-left:18px}
.topbar nav .logout{color:#ffd2cf}
.container{max-width:920px;margin:0 auto;padding:24px 18px 60px}
.foot{text-align:center;color:var(--muted);font-size:12px;padding:20px}
h1{font-size:24px;margin:6px 0 14px}
h1 small{font-size:14px;color:var(--muted);font-weight:500;margin-left:8px}
h2{font-size:17px;margin:0 0 12px}
.hint{color:var(--muted);font-size:13px}
.alert{padding:10px 14px;border-radius:8px;margin:12px 0;font-size:14px}
.alert.ok{background:#e6f5ec;color:var(--ok)}
.alert.err{background:#fdecea;color:var(--danger)}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px;margin:16px 0}
table{width:100%;border-collapse:collapse;font-size:14px}
th,td{text-align:left;padding:9px 8px;border-bottom:1px solid var(--line)}
th{color:var(--muted);font-weight:600}
button{background:var(--accent);color:#fff;border:0;border-radius:8px;padding:9px 16px;font-size:14px;cursor:pointer}
button:hover{background:var(--accent2)}
button.danger{background:var(--danger);padding:6px 12px;font-size:13px}
button:disabled{opacity:.5;cursor:default}
input,select,textarea{font-family:inherit;font-size:14px;padding:9px 11px;border:1px solid var(--line);border-radius:8px;width:100%;background:#fff}
.productbar{display:flex;align-items:center;gap:10px;margin:0 0 14px;padding:10px 14px;background:#eef2f8;border-radius:10px}
.productbar label{font-size:13px;color:var(--muted);font-weight:600}
.productbar select{width:auto;min-width:200px}
.upload{display:flex;gap:10px;align-items:center}
.upload input[type=file]{border:1px dashed var(--line);padding:8px}
/* 로그인 */
.login-wrap{display:flex;justify-content:center;padding:40px 0}
.login-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:34px;width:360px;text-align:center;box-shadow:0 8px 30px rgba(0,0,0,.05)}
.login-card h1{color:var(--accent);margin:0;font-size:30px}
.login-card .sub{color:var(--muted);font-size:13px;margin:4px 0 20px}
.login-card form{text-align:left}
.login-card label{display:block;font-size:13px;color:var(--muted);margin:12px 0 4px}
.login-card button{width:100%;margin-top:20px;padding:11px}
.btn-link{display:inline-block;margin-top:16px}
/* 챗 레이아웃 (사이드바 + 본문) */
.chat-layout{display:flex;gap:14px;height:calc(100vh - 180px);min-height:440px}
.sessions{width:210px;flex-shrink:0;display:flex;flex-direction:column;gap:8px;overflow:hidden}
.newchat{width:100%}
#sessionList{list-style:none;margin:0;padding:0;overflow-y:auto;flex:1}
.session-item{display:flex;align-items:center;justify-content:space-between;gap:4px;padding:8px 10px;border-radius:8px;font-size:13px;cursor:pointer}
.session-item:hover{background:#eef2f8}
.session-item.active{background:#e0e9f5}
.session-item .stitle{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.session-item .sact{display:none;gap:2px}
.session-item:hover .sact{display:flex}
.session-item .sact button{background:none;color:var(--muted);padding:2px 4px;font-size:12px}
.session-item .sact button:hover{color:var(--accent)}
/* 챗 본문 */
.chat-page{flex:1;display:flex;flex-direction:column;min-width:0}
@media(max-width:680px){.chat-layout{flex-direction:column;height:auto}.sessions{width:100%;height:auto}#sessionList{max-height:120px}.chat-page{height:70vh}}
.chat-head{display:flex;align-items:center;gap:12px;margin-bottom:10px}
.chat-head select{width:auto;min-width:180px}
.messages{flex:1;overflow-y:auto;background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px;display:flex;flex-direction:column;gap:12px}
.msg{display:flex}
.msg.user{justify-content:flex-end}
.bubble{max-width:78%;padding:11px 14px;border-radius:14px;font-size:14.5px;white-space:normal;word-break:break-word}
.msg.bot .bubble{background:#eef2f8;border-top-left-radius:4px}
.msg.user .bubble{background:var(--accent);color:#fff;border-top-right-radius:4px}
.sources{margin-top:8px;font-size:12px;color:var(--muted);border-top:1px dashed #cbd5e1;padding-top:6px}
.dots{color:var(--muted)}
.ask{display:flex;gap:10px;margin-top:12px}
.ask input{flex:1}
/* 설정 */
.settings-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.settings fieldset{border:1px solid var(--line);border-radius:10px;padding:14px}
.settings legend{font-weight:700;font-size:14px;color:var(--accent);padding:0 6px}
.settings label{display:block;font-size:13px;margin:10px 0 0}
.settings label small{color:var(--muted);font-weight:400}
.settings label.check{display:flex;align-items:center;gap:8px;margin-top:14px}
.settings label.check input{width:auto}
.settings input,.settings textarea{margin-top:4px}
.settings label.full{display:block;margin:18px 0}
.settings>button{margin-top:8px}
@media(max-width:640px){.settings-grid{grid-template-columns:1fr}}