:root {
  --bg: #f6f4ef;
  --panel: #fffdf9;
  --side: #efece5;
  --line: #e2ddd2;
  --text: #22211e;
  --muted: #77736a;
  --accent: #1f6f68;
  --accent-soft: #e3efed;
  --warn: #b0502c;
  --radius: 14px;
  --font: "Microsoft JhengHei", "PingFang TC", "Noto Sans TC", system-ui, sans-serif;
  --mono: "Cascadia Mono", Consolas, ui-monospace, monospace;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body { font-family: var(--font); background: var(--bg); color: var(--text); font-size: 15px; line-height: 1.6; }
button, input, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; }
a { color: var(--accent); }

/* ---------- auth ---------- */
.auth { min-height: 100%; display: grid; place-items: center; padding: 24px; }
.auth-card { width: 100%; max-width: 400px; background: var(--panel); border: 1px solid var(--line); border-radius: 20px; padding: 32px 28px; }
.brand { font-size: 26px; font-weight: 800; letter-spacing: -0.5px; margin: 0 0 4px; }
.brand span { color: var(--accent); }
.auth-card p.sub { color: var(--muted); margin: 0 0 22px; }
.tabs { display: flex; gap: 4px; background: var(--side); border-radius: 10px; padding: 4px; margin-bottom: 18px; }
.tabs button { flex: 1; border: 0; background: transparent; padding: 8px; border-radius: 8px; color: var(--muted); }
.tabs button.on { background: var(--panel); color: var(--text); font-weight: 700; box-shadow: 0 1px 2px #0001; }
label { display: block; font-size: 13px; color: var(--muted); margin: 12px 0 4px; }
.field { width: 100%; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; background: #fff; outline: none; }
.field:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.hint { font-size: 12px; color: var(--muted); margin-top: 4px; }
.btn { border: 0; background: var(--accent); color: #fff; padding: 10px 16px; border-radius: 10px; font-weight: 700; }
.btn:disabled { opacity: .5; cursor: default; }
.btn.block { width: 100%; margin-top: 20px; padding: 12px; }
.btn.ghost { background: transparent; color: var(--text); border: 1px solid var(--line); font-weight: 500; }
.btn.small { padding: 6px 10px; font-size: 13px; }
.btn.danger { background: transparent; color: var(--warn); border: 1px solid #ecd2c6; font-weight: 500; }
.error { color: var(--warn); font-size: 14px; margin-top: 12px; min-height: 1em; }

/* ---------- shell ---------- */
.shell { display: grid; grid-template-columns: 270px minmax(0, 1fr); height: 100dvh; }
.side { background: var(--side); border-right: 1px solid var(--line); display: flex; flex-direction: column; min-height: 0; }
.side-top { padding: 18px 16px 10px; }
.side-top .brand { font-size: 20px; }
.company-name { font-size: 12px; color: var(--muted); }
.new-btn { margin: 10px 12px 6px; display: flex; align-items: center; gap: 8px; width: calc(100% - 24px); justify-content: center; }
.side-scroll { overflow: auto; flex: 1; padding: 6px 8px 12px; }
.side-label { font-size: 11px; font-weight: 700; letter-spacing: 1px; color: var(--muted); padding: 12px 10px 6px; text-transform: uppercase; display: flex; justify-content: space-between; align-items: center; }
.side-label button { border: 0; background: none; color: var(--muted); font-size: 18px; line-height: 1; padding: 0 4px; }
.nav-item { display: flex; align-items: center; gap: 8px; width: 100%; text-align: left; border: 0; background: transparent; padding: 8px 10px; border-radius: 8px; color: var(--text); text-decoration: none; }
.nav-item:hover { background: #e6e2d9; }
.nav-item.on { background: var(--panel); font-weight: 700; box-shadow: 0 1px 2px #0001; }
.nav-item .grow { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.nav-item .meta { font-size: 11px; color: var(--muted); }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); flex: none; animation: pulse 1.2s infinite; }
@keyframes pulse { 50% { opacity: .3; } }
.side-foot { border-top: 1px solid var(--line); padding: 10px 12px; display: flex; align-items: center; gap: 8px; }
.avatar { width: 30px; height: 30px; border-radius: 50%; background: var(--accent); color: #fff; display: grid; place-items: center; font-weight: 700; font-size: 13px; flex: none; }
.side-foot .who { flex: 1; min-width: 0; font-size: 13px; line-height: 1.3; }
.side-foot .who small { color: var(--muted); display: block; overflow: hidden; text-overflow: ellipsis; }
.live { font-size: 11px; color: var(--muted); display: flex; align-items: center; gap: 5px; }
.live i { width: 7px; height: 7px; border-radius: 50%; background: #9a958b; }
.live.on i { background: #2e9e5b; }

.main { display: flex; flex-direction: column; min-width: 0; min-height: 0; }
.scrim { display: none; }
.topbar { display: none; }
.content { flex: 1; overflow: auto; }
.wrap { max-width: 820px; margin: 0 auto; padding: 32px 24px 40px; }

/* ---------- home / ask ---------- */
.hero { padding-top: 12vh; text-align: center; }
.hero h1 { font-size: 34px; font-weight: 800; margin: 0 0 8px; letter-spacing: -0.5px; }
.hero p { color: var(--muted); margin: 0 0 26px; }
.ask { background: var(--panel); border: 1px solid var(--line); border-radius: 18px; padding: 12px 12px 10px 16px; text-align: left; box-shadow: 0 2px 10px #00000008; }
.ask:focus-within { border-color: var(--accent); }
.ask textarea { width: 100%; border: 0; outline: none; resize: none; background: transparent; min-height: 54px; max-height: 260px; }
.ask-bar { display: flex; align-items: center; gap: 8px; }
.ask-bar select { border: 1px solid var(--line); border-radius: 8px; background: #fff; padding: 5px 8px; font-size: 13px; max-width: 220px; }
.ask-bar .spacer { flex: 1; }
.send { width: 36px; height: 36px; border-radius: 50%; border: 0; background: var(--accent); color: #fff; font-size: 18px; display: grid; place-items: center; }
.send:disabled { opacity: .35; }
.send.stop { background: var(--text); font-size: 13px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 18px; }
.chip { border: 1px solid var(--line); background: var(--panel); border-radius: 999px; padding: 6px 12px; font-size: 13px; color: var(--muted); }
.chip:hover { color: var(--text); border-color: #cfc8b9; }

/* ---------- project page ---------- */
.page-head { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 18px; }
.page-head h1 { font-size: 26px; margin: 0; flex: 1; }
.page-head .desc { color: var(--muted); margin: 4px 0 0; white-space: pre-wrap; }
.list { display: grid; gap: 8px; margin-top: 22px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }
a.card { display: block; text-decoration: none; color: inherit; }
a.card:hover { border-color: #cfc8b9; }
.card .t { font-weight: 700; display: flex; gap: 8px; align-items: center; }
.card .m { font-size: 12px; color: var(--muted); margin-top: 2px; }
.empty { color: var(--muted); text-align: center; padding: 30px 0; }
.badge { font-size: 11px; padding: 1px 8px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); font-weight: 700; }
.badge.grey { background: #ebe7de; color: var(--muted); }
.badge.err { background: #f8e4da; color: var(--warn); }

/* ---------- conversation ---------- */
.conv-title { font-size: 13px; color: var(--muted); margin-bottom: 18px; }
.conv-title a { color: var(--muted); }
.turn { margin-bottom: 34px; }
.q { font-size: 22px; font-weight: 700; line-height: 1.4; margin: 0 0 4px; white-space: pre-wrap; word-break: break-word; }
.q-meta { font-size: 12px; color: var(--muted); margin-bottom: 14px; }
.steps { display: grid; gap: 6px; margin-bottom: 12px; }
.step { font-size: 13px; color: var(--muted); display: flex; gap: 8px; align-items: baseline; }
.step b { color: var(--text); font-weight: 600; }
.step .ic { width: 16px; text-align: center; flex: none; }
.sources { display: flex; gap: 8px; overflow-x: auto; padding-bottom: 6px; margin-bottom: 12px; }
.src { flex: none; width: 180px; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 8px 10px; text-decoration: none; color: var(--text); font-size: 12px; line-height: 1.35; }
.src:hover { border-color: #cfc8b9; }
.src .h { color: var(--muted); font-size: 11px; display: flex; gap: 6px; align-items: center; margin-bottom: 3px; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.src .h img { width: 14px; height: 14px; border-radius: 3px; }
.src .tt { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
details.think { font-size: 13px; color: var(--muted); margin-bottom: 10px; border-left: 3px solid var(--line); padding-left: 10px; }
details.think summary { cursor: pointer; }
details.think div { white-space: pre-wrap; margin-top: 6px; }
.answer { word-break: break-word; }
.answer > :first-child { margin-top: 0; }
.answer h1, .answer h2, .answer h3 { line-height: 1.35; margin: 1.2em 0 .5em; }
.answer h1 { font-size: 22px; } .answer h2 { font-size: 19px; } .answer h3 { font-size: 16px; }
.answer table { border-collapse: collapse; display: block; overflow-x: auto; margin: 12px 0; }
.answer th, .answer td { border: 1px solid var(--line); padding: 6px 10px; text-align: left; vertical-align: top; }
.answer th { background: #f1ede4; }
.answer code { font-family: var(--mono); font-size: 13px; background: #eeeae0; padding: 1px 5px; border-radius: 5px; }
.answer blockquote { margin: 10px 0; padding-left: 12px; border-left: 3px solid var(--line); color: var(--muted); }
.codebox { margin: 12px 0; border: 1px solid #2e2c28; border-radius: 12px; overflow: hidden; background: #1f1e1b; }
.codebox .bar { display: flex; align-items: center; gap: 6px; padding: 6px 8px 6px 12px; background: #2a2825; color: #bdb6a8; font-size: 12px; }
.codebox .bar .lang { flex: 1; font-family: var(--mono); }
.codebox .bar button { border: 0; background: #3a3833; color: #e9e3d6; border-radius: 6px; padding: 3px 9px; font-size: 12px; }
.codebox pre { margin: 0; padding: 12px 14px; overflow: auto; max-height: 520px; }
.codebox pre code { background: none; color: #ece6da; padding: 0; font-size: 13px; }
.preview { width: 100%; height: 520px; border: 0; background: #fff; display: block; }
.cites { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.cite { font-size: 12px; border: 1px solid var(--line); background: var(--panel); border-radius: 999px; padding: 2px 10px; text-decoration: none; color: var(--muted); max-width: 260px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mem { font-size: 13px; background: var(--accent-soft); color: #164f4a; border-radius: 10px; padding: 6px 10px; margin: 8px 0; }
.notice { font-size: 13px; color: var(--muted); font-style: italic; margin: 8px 0; }
.err-box { font-size: 14px; color: var(--warn); background: #fbece5; border-radius: 10px; padding: 10px 12px; margin: 8px 0; }
.typing { display: inline-block; width: 8px; height: 16px; background: var(--accent); vertical-align: text-bottom; animation: pulse 1s infinite; margin-left: 2px; }
.dock { position: sticky; bottom: 0; background: linear-gradient(transparent, var(--bg) 30%); padding: 18px 0 16px; }

/* ---------- knowledge pages ---------- */
.section { margin-top: 28px; }
.section h2 { font-size: 17px; margin: 0 0 4px; }
.section > p { color: var(--muted); margin: 0 0 12px; font-size: 14px; }
.drop { border: 2px dashed #d5cfc1; border-radius: var(--radius); padding: 26px; text-align: center; color: var(--muted); background: var(--panel); }
.drop.over { border-color: var(--accent); background: var(--accent-soft); }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.doc-guide { white-space: pre-wrap; font-size: 13px; background: #faf8f3; border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; margin-top: 10px; max-height: 320px; overflow: auto; }
textarea.field { min-height: 80px; resize: vertical; }
.mem-item { display: flex; gap: 10px; align-items: flex-start; }
.mem-item .c { flex: 1; min-width: 0; white-space: pre-wrap; word-break: break-word; }
.icon-btn { border: 0; background: transparent; color: var(--muted); padding: 2px 6px; border-radius: 6px; font-size: 13px; }
.icon-btn:hover { background: #ebe7de; color: var(--text); }
.filter { display: flex; gap: 6px; flex-wrap: wrap; margin: 12px 0; }
.filter button { border: 1px solid var(--line); background: var(--panel); border-radius: 999px; padding: 4px 12px; font-size: 13px; color: var(--muted); }
.filter button.on { background: var(--text); color: #fff; border-color: var(--text); }
.invite { font-family: var(--mono); background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 8px 12px; user-select: all; }
.banner { background: #fff4e6; border: 1px solid #f0d9b5; color: #7a5420; padding: 10px 14px; border-radius: 10px; font-size: 14px; margin-bottom: 16px; }

/* ---------- modal ---------- */
.modal-bg { position: fixed; inset: 0; background: #0005; display: grid; place-items: center; padding: 16px; z-index: 50; }
.modal { background: var(--panel); border-radius: 18px; padding: 22px; width: 100%; max-width: 460px; }
.modal h2 { margin: 0 0 6px; font-size: 19px; }
.modal .actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 18px; }

/* ---------- mobile ---------- */
@media (max-width: 820px) {
  .shell { grid-template-columns: 1fr; }
  .side { position: fixed; inset: 0 22% 0 0; z-index: 40; transform: translateX(-102%); transition: transform .2s; box-shadow: 4px 0 20px #0002; }
  .shell.nav-open .side { transform: none; }
  .shell.nav-open .scrim { display: block; position: fixed; inset: 0; background: #0003; z-index: 30; }
  .topbar { display: flex; align-items: center; gap: 10px; padding: 10px 14px; border-bottom: 1px solid var(--line); background: var(--bg); }
  .topbar button { border: 0; background: none; font-size: 22px; padding: 0 4px; }
  .topbar .brand { font-size: 17px; margin: 0; }
  .wrap { padding: 20px 14px 30px; }
  .hero { padding-top: 6vh; }
  .hero h1 { font-size: 26px; }
  .q { font-size: 19px; }
  .preview { height: 420px; }
}