/*
  RAG 사용자 화면 스타일 (라이트 테마)
  모델: 사용 안 함
  기술: CSS3 (Custom Properties, Grid, Flexbox)
  라이브러리: Pretendard 웹폰트
*/
:root {
  --bg: #F2F4F6; --surface: #FFFFFF; --surface-2: #F9FAFB; --border: #E5E8EB;
  --fg: #191F28; --fg-2: #4E5968; --muted: #8B95A1;
  --accent: #0064FF; --accent-weak: #E8F3FF; --danger: #F04452; --ok: #12B76A;
  --radius: 14px; --shadow: 0 1px 3px rgba(0,0,0,.04), 0 4px 16px rgba(0,0,0,.04);
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg); color: var(--fg);
  font-family: Pretendard, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 15px; line-height: 1.6; display: flex; flex-direction: column;
}

.model-info {
  display: flex; flex-wrap: wrap; gap: 6px 18px; padding: 8px 24px;
  background: #191F28; color: #D1D6DB; font-size: 12px;
}
.model-info b { color: #fff; font-weight: 600; margin-right: 4px; }

.topbar {
  display: flex; align-items: center; gap: 20px; padding: 16px 24px;
  background: var(--surface); border-bottom: 1px solid var(--border);
}
.topbar .back { color: var(--fg-2); text-decoration: none; font-size: 14px; font-weight: 600;
  padding: 6px 10px; border-radius: 8px; }
.topbar .back:hover { background: var(--bg); }
.topbar h1 { margin: 0; font-size: 20px; letter-spacing: -.02em; }
.topbar p { margin: 0; color: var(--muted); font-size: 13px; }
.topbar .stats { margin-left: auto; font-size: 13px; color: var(--fg-2);
  background: var(--bg); padding: 6px 12px; border-radius: 999px; white-space: nowrap; }

.layout { flex: 1; min-height: 0; display: grid; grid-template-columns: 320px 1fr; gap: 16px;
  padding: 16px 24px 24px; max-width: 1400px; width: 100%; margin: 0 auto; }
.panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); min-height: 0; }

.docs { padding: 18px; display: flex; flex-direction: column; gap: 12px; }
.panel-head { display: flex; align-items: center; justify-content: space-between; }
.panel-head h2 { margin: 0; font-size: 16px; }
.drop { display: flex; flex-direction: column; gap: 2px; align-items: center; text-align: center;
  border: 1.5px dashed #C9D1DA; border-radius: 12px; padding: 18px 12px; cursor: pointer;
  background: var(--surface-2); transition: .15s; }
.drop:hover, .drop.over { border-color: var(--accent); background: var(--accent-weak); }
.drop strong { color: var(--accent); font-size: 14px; }
.drop span { color: var(--muted); font-size: 12px; }
.upload-state { font-size: 13px; color: var(--fg-2); background: var(--accent-weak);
  border-radius: 10px; padding: 10px 12px; display: flex; gap: 8px; align-items: center; }
.doc-list { list-style: none; margin: 0; padding: 0; overflow: auto; flex: 1;
  display: flex; flex-direction: column; gap: 8px; }
.doc { border: 1px solid var(--border); border-radius: 12px; padding: 10px 12px;
  display: grid; grid-template-columns: 1fr auto; gap: 2px 8px; }
.doc .name { font-weight: 600; font-size: 14px; word-break: break-all; }
.doc .meta { grid-column: 1; color: var(--muted); font-size: 12px; }
.doc button { grid-row: 1 / span 2; grid-column: 2; align-self: center; }
.doc-empty { color: var(--muted); font-size: 13px; text-align: center; padding: 16px 0; }

.chat { display: flex; flex-direction: column; overflow: hidden; }
.messages { flex: 1; overflow: auto; padding: 24px; display: flex; flex-direction: column; gap: 18px; }
.empty { margin: auto; text-align: center; color: var(--muted); }
.empty h3 { color: var(--fg); margin: 0 0 4px; font-size: 18px; }
.msg-q { align-self: flex-end; max-width: 75%; background: var(--accent); color: #fff;
  padding: 10px 14px; border-radius: 16px 16px 4px 16px; white-space: pre-wrap; word-break: break-word; }
.msg-a { align-self: flex-start; width: 100%; max-width: 920px; background: var(--surface-2);
  border: 1px solid var(--border); border-radius: 4px 16px 16px 16px; padding: 18px 20px; }
.msg-a .who { font-size: 12px; color: var(--muted); margin-bottom: 6px; font-weight: 600; }
.msg-a.error { border-color: #FFD4D8; background: #FFF5F6; color: #B4232F; }
.loading { display: inline-flex; gap: 4px; }
.loading i { width: 7px; height: 7px; border-radius: 50%; background: var(--muted); animation: b 1s infinite; }
.loading i:nth-child(2) { animation-delay: .15s; } .loading i:nth-child(3) { animation-delay: .3s; }
@keyframes b { 0%,80%,100% { opacity: .3 } 40% { opacity: 1 } }

/* Markdown 뷰어 */
.md { color: var(--fg); font-size: 15px; line-height: 1.75; }
.md > :first-child { margin-top: 0; } .md > :last-child { margin-bottom: 0; }
.md h1, .md h2, .md h3, .md h4 { line-height: 1.35; margin: 1.2em 0 .5em; letter-spacing: -.01em; }
.md h1 { font-size: 1.35em; } .md h2 { font-size: 1.2em; padding-bottom: 6px; border-bottom: 1px solid var(--border); }
.md h3 { font-size: 1.07em; } .md p { margin: .6em 0; }
.md ul, .md ol { padding-left: 1.4em; margin: .5em 0; } .md li { margin: .25em 0; }
.md strong { color: #000; } .md a { color: var(--accent); }
.md code { background: #EEF1F4; padding: .1em .4em; border-radius: 5px; font-size: .9em;
  font-family: "JetBrains Mono", Consolas, monospace; }
.md pre { background: #1E2530; color: #E6EDF3; padding: 14px 16px; border-radius: 10px; overflow: auto; }
.md pre code { background: none; padding: 0; color: inherit; }
.md blockquote { margin: .8em 0; padding: 8px 14px; border-left: 3px solid var(--accent);
  background: var(--accent-weak); border-radius: 0 8px 8px 0; color: var(--fg-2); }
.md table { border-collapse: collapse; width: 100%; margin: .8em 0; font-size: .93em; display: block; overflow-x: auto; }
.md th, .md td { border: 1px solid var(--border); padding: 7px 10px; text-align: left; }
.md th { background: #F2F4F6; font-weight: 600; }
.md hr { border: 0; border-top: 1px solid var(--border); margin: 1.2em 0; }
.md .cite { display: inline-block; min-width: 18px; padding: 0 5px; margin: 0 1px; font-size: 11px;
  font-weight: 700; line-height: 18px; text-align: center; color: var(--accent);
  background: var(--accent-weak); border-radius: 6px; vertical-align: 2px; }

.sources { margin-top: 14px; border-top: 1px solid var(--border); padding-top: 10px; }
.sources summary { cursor: pointer; font-size: 13px; color: var(--fg-2); font-weight: 600; }
.src { margin-top: 8px; padding: 10px 12px; background: var(--surface); border: 1px solid var(--border);
  border-radius: 10px; font-size: 13px; }
.src .h { display: flex; gap: 8px; align-items: center; color: var(--fg-2); font-weight: 600; margin-bottom: 4px; }
.src .h .score { margin-left: auto; color: var(--muted); font-weight: 500; }
.src p { margin: 0; color: var(--fg-2); white-space: pre-wrap; max-height: 7.5em; overflow: auto; }

.composer { display: flex; gap: 8px; padding: 14px; border-top: 1px solid var(--border); background: var(--surface); }
.composer select, .composer textarea { font: inherit; border: 1px solid var(--border); border-radius: 10px;
  padding: 10px 12px; background: var(--surface-2); color: var(--fg); }
.composer select { max-width: 180px; }
.composer textarea { flex: 1; resize: none; max-height: 160px; }
.composer :focus { outline: 2px solid var(--accent-weak); border-color: var(--accent); }

.btn { font: inherit; font-weight: 600; border: 0; border-radius: 10px; padding: 10px 18px; cursor: pointer; }
.btn.primary { background: var(--accent); color: #fff; }
.btn.primary:hover { background: #0050CC; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn.ghost { background: transparent; color: var(--fg-2); }
.btn.ghost:hover { background: var(--bg); }
.btn.danger { color: var(--danger); }
.btn.sm { padding: 5px 10px; font-size: 13px; }

.toast { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); background: #191F28;
  color: #fff; padding: 10px 18px; border-radius: 10px; font-size: 14px; box-shadow: var(--shadow); z-index: 10; }
.toast.err { background: var(--danger); }

@media (max-width: 860px) {
  body { height: auto; }
  .layout { grid-template-columns: 1fr; padding: 12px 16px 16px; }
  .topbar { flex-wrap: wrap; padding: 12px 16px; gap: 8px 12px; }
  .topbar .stats { margin-left: 0; }
  .model-info { padding: 8px 16px; }
  .chat { min-height: 70vh; }
  .composer { flex-wrap: wrap; } .composer select { max-width: none; width: 100%; }
  .msg-q { max-width: 90%; }
}

/* 문서 보기 */
.doc .name.link { cursor: pointer; color: var(--fg); }
.doc .name.link:hover { color: var(--accent); text-decoration: underline; }
.doc .acts { grid-row: 1 / span 2; grid-column: 2; align-self: center; display: flex; gap: 2px; }
.src .h .pg { color: var(--accent); cursor: pointer; background: none; border: 0; font: inherit; padding: 0; }
.src .h .pg:hover { text-decoration: underline; }
.modal { position: fixed; inset: 0; background: rgba(25,31,40,.45); z-index: 20;
  display: grid; place-items: center; padding: 24px; }
.modal-box { background: var(--surface); border-radius: 16px; width: min(1000px, 100%); height: min(88vh, 900px);
  display: flex; flex-direction: column; overflow: hidden; box-shadow: 0 20px 60px rgba(0,0,0,.2); }
.modal-head { display: flex; align-items: center; gap: 12px; padding: 14px 18px; border-bottom: 1px solid var(--border); }
.modal-head .vt { flex: 1; min-width: 0; }
.modal-head h2 { margin: 0; font-size: 16px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.modal-head .vt span { font-size: 12px; color: var(--muted); }
.modal-head a.btn { text-decoration: none; }
.tabs { display: flex; background: var(--bg); border-radius: 10px; padding: 3px; }
.tab { font: inherit; font-size: 13px; font-weight: 600; border: 0; background: none; color: var(--fg-2);
  padding: 6px 12px; border-radius: 8px; cursor: pointer; }
.tab.active { background: var(--surface); color: var(--fg); box-shadow: 0 1px 2px rgba(0,0,0,.08); }
.modal-body { flex: 1; min-height: 0; display: flex; }
.pane { flex: 1; min-height: 0; display: flex; flex-direction: column; }
.pane iframe { flex: 1; width: 100%; border: 0; background: #525659; }
.vtools { display: flex; gap: 10px; align-items: center; padding: 12px 18px; border-bottom: 1px solid var(--border); }
.vtools input { font: inherit; flex: 1; border: 1px solid var(--border); border-radius: 10px; padding: 8px 12px; background: var(--surface-2); }
.vtools input:focus { outline: 2px solid var(--accent-weak); border-color: var(--accent); }
.vtools span { font-size: 13px; color: var(--muted); white-space: nowrap; }
.pages { flex: 1; overflow: auto; padding: 18px; background: var(--bg); display: flex; flex-direction: column; gap: 12px; }
.page { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 16px 20px; scroll-margin-top: 12px; }
.page.focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-weak); }
.page h3 { margin: 0 0 8px; font-size: 13px; color: var(--accent); }
.page pre { margin: 0; white-space: pre-wrap; word-break: break-word; font: inherit; font-size: 14px; line-height: 1.75; color: var(--fg); }
.page .none { color: var(--muted); font-size: 13px; }
mark { background: #FFE58F; color: inherit; border-radius: 3px; padding: 0 1px; }
@media (max-width: 860px) {
  .modal { padding: 0; } .modal-box { height: 100vh; border-radius: 0; }
  .modal-head { flex-wrap: wrap; } .modal-head .vt { flex-basis: calc(100% - 50px); }
}
.notice { margin: 0; font-size: 13px; color: #8A5A00; background: #FFF8E1; border: 1px solid #FFE7A3; border-radius: 10px; padding: 10px 14px; }