:root {
  --bg: #f4f5f7; --panel: #ffffff; --ink: #1b1f24; --muted: #69717d;
  --line: #e2e5ea; --accent: #0b6e6e; --accent-ink: #ffffff; --accent-soft: #e3f1f0;
  --user: #eef1f5; --err: #b42318; --ok: #157347; --warn: #8a5a00;
  --hi-bg: #d9f2e4; --hi-ink: #11633a; --mid-bg: #fdf1d6; --mid-ink: #8a5a00;
  --mark: #ffe58a; --shadow: 0 8px 30px rgba(0,0,0,.12);
  --radius: 10px;
  font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111418; --panel: #1a1e24; --ink: #e6e8eb; --muted: #9aa3ae;
    --line: #2b3139; --accent: #3fb6b0; --accent-ink: #0b1414; --accent-soft: #1b2e2d;
    --user: #232932; --err: #ff8a80; --ok: #6fd39a; --warn: #f0c56a;
    --hi-bg: #183b28; --hi-ink: #7fe0a8; --mid-bg: #3b3018; --mid-ink: #f0c56a;
    --mark: #6b5a12; --shadow: 0 8px 30px rgba(0,0,0,.5);
  }
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font-size: 15px; line-height: 1.6; display: flex; flex-direction: column; }
.muted { color: var(--muted); }
.err { color: var(--err); }
.ok { color: var(--ok); }
.warn { color: var(--warn); }
.small { font-size: 13px; }
.hidden { display: none !important; }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.grow { flex: 1; }
.pad { padding: 20px 4px; }

/* 頂部 */
.topbar { display: flex; align-items: center; gap: 16px; padding: 8px 16px; background: var(--panel); border-bottom: 1px solid var(--line); }
.brand { font-weight: 700; font-size: 17px; letter-spacing: .02em; white-space: nowrap; }
.logo { color: var(--accent); }
.tabs { display: flex; gap: 2px; overflow-x: auto; scrollbar-width: none; flex: 1; }
.tabs::-webkit-scrollbar { display: none; }
.tab { background: none; border: 0; padding: 7px 12px; border-radius: 8px; color: var(--muted); font: inherit; cursor: pointer; white-space: nowrap; }
.tab:hover { color: var(--ink); }
.tab.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.right { display: flex; gap: 10px; align-items: center; white-space: nowrap; }
.chip { font-size: 12px; padding: 2px 10px; border: 1px solid var(--line); border-radius: 99px; color: var(--muted); font-family: ui-monospace, monospace; }
.user-btn { background: none; border: 1px solid var(--line); border-radius: 99px; padding: 3px 12px; font: inherit; font-size: 14px; color: var(--ink); cursor: pointer; }
.link { color: var(--muted); text-decoration: none; font-size: 14px; }
.link:hover { color: var(--accent); }

main { flex: 1; min-height: 0; display: flex; }
.panel { display: none; flex: 1; min-height: 0; padding: 18px; overflow-y: auto; }
.panel.active { display: flex; flex-direction: column; }
.panel.fixed { overflow: hidden; }
.wrap { max-width: 980px; width: 100%; margin: 0 auto; }

/* 按鈕與輸入 */
.btn { font: inherit; font-size: 14px; padding: 7px 14px; border-radius: 8px; border: 1px solid var(--line); background: var(--panel); color: var(--ink); cursor: pointer; white-space: nowrap; }
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; }
.btn.ghost { background: transparent; }
.btn.danger { color: var(--err); }
.btn.small { padding: 3px 10px; font-size: 13px; }
.btn:disabled { opacity: .5; cursor: default; }
input, textarea, select { font: inherit; color: var(--ink); background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 8px 11px; width: 100%; }
textarea { resize: vertical; }
select { width: auto; background: var(--panel); padding: 6px 8px; }
input[type=checkbox] { width: auto; }
input:focus, textarea:focus, select:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
label.field { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }
label.field > span { font-weight: 500; }
.check { display: inline-flex; gap: 6px; align-items: center; cursor: pointer; font-size: 14px; color: var(--muted); }

/* 卡片 */
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; display: flex; flex-direction: column; gap: 10px; min-width: 0; }
.card h3 { margin: 0; font-size: 16px; }
.card p { margin: 0; }
.card-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; flex-wrap: wrap; }
.split { display: grid; grid-template-columns: minmax(300px, 2fr) 3fr; gap: 16px; flex: 1; min-height: 0; }
.split > .card { overflow-y: auto; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; }
.stat { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 14px; }
.stat .v { font-size: 24px; font-weight: 700; font-variant-numeric: tabular-nums; }
.stat .l { font-size: 13px; color: var(--muted); }
.meter { height: 6px; background: var(--bg); border-radius: 99px; overflow: hidden; margin-top: 6px; }
.meter > i { display: block; height: 100%; background: var(--accent); }
.charts { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 12px; }
.chart-box { position: relative; height: 240px; }

/* 表格 */
.tbl { width: 100%; border-collapse: collapse; font-size: 14px; }
.tbl th { text-align: left; color: var(--muted); font-weight: 500; border-bottom: 1px solid var(--line); padding: 6px; white-space: nowrap; position: sticky; top: 0; background: var(--panel); }
.tbl td { border-bottom: 1px solid var(--line); padding: 7px 6px; vertical-align: top; }
.tbl tr.click { cursor: pointer; }
.tbl tr.click:hover td { background: var(--bg); }
.tbl .num { text-align: right; font-variant-numeric: tabular-nums; }
.tbl-wrap { overflow: auto; max-height: 460px; border: 1px solid var(--line); border-radius: 8px; }
.old td { color: var(--muted); }

/* 標籤 */
.tag { display: inline-block; font-size: 12px; padding: 0 8px; border-radius: 4px; background: var(--bg); color: var(--muted); border: 1px solid var(--line); white-space: nowrap; }
.tag.acc { color: var(--accent); border-color: var(--accent); background: transparent; }
.tag.hi { background: var(--hi-bg); color: var(--hi-ink); border-color: transparent; }
.tag.mid { background: var(--mid-bg); color: var(--mid-ink); border-color: transparent; }
.tag.bad { color: var(--err); border-color: var(--err); background: transparent; }

/* 聊天 */
.chat { flex: 1; display: flex; flex-direction: column; min-height: 0; }
.messages { flex: 1; overflow-y: auto; padding-bottom: 12px; }
.empty { text-align: center; padding: 50px 10px; }
.empty h2 { margin: 0 0 6px; }
.examples { display: flex; flex-direction: column; gap: 8px; max-width: 540px; margin: 22px auto 0; }
.ex { text-align: left; font: inherit; padding: 10px 14px; border: 1px solid var(--line); border-radius: 8px; background: var(--panel); color: var(--ink); cursor: pointer; }
.ex:hover { border-color: var(--accent); }
.msg { padding: 12px 16px; border-radius: var(--radius); margin: 12px 0; }
.msg.user { background: var(--user); margin-left: 15%; white-space: pre-wrap; }
.msg.assistant { background: var(--panel); border: 1px solid var(--line); margin-right: 4%; }
.composer { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px; }
.composer textarea { border: 0; background: transparent; resize: none; }
.composer textarea:focus { outline: none; }
.composer-actions { display: flex; justify-content: space-between; align-items: center; gap: 8px; }

/* Markdown */
.markdown > :first-child { margin-top: 0; }
.markdown > :last-child { margin-bottom: 0; }
.markdown table { border-collapse: collapse; margin: 8px 0; }
.markdown th, .markdown td { border: 1px solid var(--line); padding: 4px 8px; }
.markdown code { background: var(--bg); padding: 1px 5px; border-radius: 4px; }
.markdown h1, .markdown h2, .markdown h3 { margin: 1em 0 .4em; line-height: 1.3; }
.markdown h1 { font-size: 20px; } .markdown h2 { font-size: 18px; } .markdown h3 { font-size: 16px; }
.cursor::after { content: "▍"; animation: blink 1s infinite; color: var(--accent); }

/* 來源、回饋 */
.sources { margin-top: 10px; font-size: 13px; border-top: 1px dashed var(--line); padding-top: 8px; }
.sources summary { cursor: pointer; color: var(--muted); }
.src { margin: 8px 0; padding: 8px 10px; background: var(--bg); border-radius: 6px; }
.src p { margin: 4px 0 0; color: var(--muted); white-space: pre-wrap; }
.src a { color: var(--ink); font-weight: 600; text-decoration: none; cursor: pointer; }
.src a:hover { color: var(--accent); }
.score { float: right; color: var(--muted); font-family: ui-monospace, monospace; font-size: 12px; }
.fb { display: flex; gap: 6px; align-items: center; margin-top: 8px; font-size: 13px; color: var(--muted); flex-wrap: wrap; }
.fb button { background: none; border: 1px solid var(--line); border-radius: 6px; padding: 1px 8px; cursor: pointer; font-size: 14px; }
.fb button.on { border-color: var(--accent); background: var(--accent-soft); }
.fb input { width: 260px; padding: 3px 8px; font-size: 13px; }

/* 搜尋 */
.search-box { display: flex; gap: 8px; }
.search-box input { font-size: 16px; padding: 11px 14px; }
.search-box .btn { padding: 0 22px; }
.search-opts { display: flex; gap: 16px; align-items: center; margin: 10px 2px; flex-wrap: wrap; }
.intent { background: var(--accent-soft); border-radius: var(--radius); padding: 10px 14px; margin-bottom: 12px; font-size: 14px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 6px; }
.kw { background: var(--panel); border: 1px solid var(--line); border-radius: 99px; padding: 1px 10px; font-size: 13px; }
.kw.cat { border-color: var(--accent); color: var(--accent); }
.kw.tr { border-style: dashed; }
.result { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; margin-bottom: 12px; }
.result header { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 6px; }
.result .doc { font-weight: 600; cursor: pointer; }
.result .doc:hover { color: var(--accent); }
.result .score { margin-left: auto; float: none; }
.reason { font-size: 14px; color: var(--accent); margin-bottom: 6px; }
.snippet { white-space: pre-wrap; font-size: 14px; }
.snippet.clamp { display: -webkit-box; -webkit-line-clamp: 5; -webkit-box-orient: vertical; overflow: hidden; }
.result footer { display: flex; gap: 8px; margin-top: 8px; }
mark { background: var(--mark); color: inherit; padding: 0 2px; border-radius: 3px; }

/* 上傳區 */
.drop { border: 2px dashed var(--line); border-radius: var(--radius); padding: 22px 12px; text-align: center; color: var(--muted); cursor: pointer; display: block; }
.drop.over { border-color: var(--accent); background: var(--accent-soft); }
.drop input { display: none; }
.status { font-size: 14px; }
details.box { border-top: 1px solid var(--line); padding-top: 10px; }
details.box summary { cursor: pointer; color: var(--muted); margin-bottom: 8px; }
details.box > * + * { margin-top: 8px; }

/* 子分頁 */
.subtabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); margin-bottom: 14px; overflow-x: auto; }
.subtab { background: none; border: 0; border-bottom: 2px solid transparent; padding: 8px 12px; font: inherit; color: var(--muted); cursor: pointer; white-space: nowrap; }
.subtab.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 600; }
.subpanel { display: none; }
.subpanel.active { display: flex; flex-direction: column; gap: 14px; }

/* 資料分析 */
.ds-item { padding: 8px 10px; border-radius: 8px; cursor: pointer; border: 1px solid transparent; }
.ds-item:hover { background: var(--bg); }
.ds-item.active { border-color: var(--accent); background: var(--accent-soft); }
.ds-item .n { font-size: 12px; color: var(--muted); }
.col-chip { display: inline-block; font-size: 12px; padding: 1px 8px; border-radius: 99px; border: 1px solid var(--line); margin: 2px; }
.col-chip i { font-style: normal; color: var(--muted); }
.plan { font-size: 12px; background: var(--bg); padding: 10px; border-radius: 8px; overflow: auto; max-height: 260px; }

/* 對話框 */
.modal-bg { position: fixed; inset: 0; background: rgba(0,0,0,.4); display: flex; align-items: flex-start; justify-content: center; padding: 5vh 12px; z-index: 50; overflow-y: auto; }
.modal { background: var(--panel); border-radius: 14px; box-shadow: var(--shadow); width: min(760px, 100%); padding: 20px; display: flex; flex-direction: column; gap: 12px; }
.modal.wide { width: min(1000px, 100%); }
.modal-head { display: flex; justify-content: space-between; align-items: center; }
.modal-head h3 { margin: 0; }
.x { background: none; border: 0; font-size: 22px; cursor: pointer; color: var(--muted); line-height: 1; }
.doc-text { white-space: pre-wrap; font-size: 14px; max-height: 50vh; overflow-y: auto; background: var(--bg); padding: 12px; border-radius: 8px; }
iframe.preview { width: 100%; height: 60vh; border: 1px solid var(--line); border-radius: 8px; background: #fff; }

/* 提示 */
#toasts { position: fixed; bottom: 18px; right: 18px; display: flex; flex-direction: column; gap: 8px; z-index: 60; }
.toast { background: var(--ink); color: var(--panel); padding: 10px 16px; border-radius: 8px; box-shadow: var(--shadow); font-size: 14px; max-width: 360px; }
.toast.err { background: var(--err); color: #fff; }

.dots::after { content: "…"; animation: blink 1s infinite; }
@keyframes blink { 50% { opacity: .2; } }

/* 登入 */
.login-body { align-items: center; justify-content: center; }
.login-card { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 32px; width: min(380px, 92vw); display: flex; flex-direction: column; gap: 12px; }
.login-card p { margin: -6px 0 4px; }

@media (max-width: 820px) {
  .split, .grid2, .grid3 { grid-template-columns: 1fr; }
  .panel { padding: 10px; }
  .msg.user { margin-left: 5%; }
  .topbar { flex-wrap: wrap; gap: 8px; }
  .tabs { order: 3; flex-basis: 100%; }
  .right .chip { display: none; }
  .fb input { width: 100%; }
}

/* 長內容分頁：子元素不可被壓縮（否則子分頁列會被擠成 0 高） */
.panel:not(.fixed) > *, .subpanel > * { flex-shrink: 0; }
#lang { width: 92px; }
.card > .btn, details.box > .btn, .modal-body > .btn { align-self: flex-start; }
.modal-body { display: flex; flex-direction: column; gap: 10px; }