:root {
  --navy: #19315F; --blue: #17A5FB; --pink: #E80584; --muted: #5C7A99; --line: #E3EAF2;
  --bg: #F5F8FC; --card: #FFFFFF; --pale: #EFF6FC; --user: #19315F; --shadow: 0 1px 2px rgba(25,49,95,.06), 0 4px 16px rgba(25,49,95,.06);
  --top: 56px; --safe-b: env(safe-area-inset-bottom, 0px);
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body { font-family: Metropolis, Inter, system-ui, -apple-system, sans-serif; color: var(--navy); background: var(--bg);
  font-size: 16px; line-height: 1.5; -webkit-font-smoothing: antialiased; }
.hidden { display: none !important; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
a { color: var(--blue); text-decoration: none; }
svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

/* sign in */
.signin { min-height: 100dvh; display: grid; place-items: center; padding: 24px; }
.signin-card { background: var(--card); border-radius: 16px; box-shadow: var(--shadow); padding: 36px 28px; max-width: 380px; width: 100%; text-align: center; }
.signin-logo { width: 64px; height: 64px; }
.signin h1 { margin: 12px 0 4px; font-size: 26px; }
.btn { display: inline-flex; align-items: center; justify-content: center; height: 42px; padding: 0 20px; border-radius: 10px;
  font: 600 15px Inter, sans-serif; border: 1px solid var(--line); background: var(--card); color: var(--navy); cursor: pointer; }
.btn.primary { background: var(--blue); border-color: var(--blue); color: #fff; }
.signin .btn { width: 100%; margin-top: 20px; }

/* top bar and drawer */
.top { position: fixed; inset: 0 0 auto 0; height: var(--top); display: flex; align-items: center; gap: 8px; padding: 0 8px;
  background: rgba(255,255,255,.92); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); z-index: 20; }
.icon-btn { width: 40px; height: 40px; border: 0; background: none; color: var(--navy); border-radius: 10px; display: grid; place-items: center; cursor: pointer; }
.icon-btn:hover { background: var(--pale); }
.brand { flex: 1; display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 17px; cursor: pointer; min-width: 0; }
.brand img { width: 26px; height: 26px; }
.pill { font-size: 11px; font-weight: 700; letter-spacing: .4px; padding: 2px 8px; border-radius: 99px; background: var(--pale); color: var(--navy); }
.pill.lt { background: #FDE6F2; color: var(--pink); }
.drawer { position: fixed; top: 0; bottom: 0; left: 0; width: min(300px, 84vw); background: var(--card); z-index: 40; transform: translateX(-102%);
  transition: transform .22s ease; display: flex; flex-direction: column; padding: 14px 10px calc(10px + var(--safe-b)); box-shadow: 4px 0 24px rgba(25,49,95,.12); }
.drawer.open { transform: none; }
.drawer:not(.open) { box-shadow: none; }
.drawer nav a { display: flex; align-items: center; gap: 12px; padding: 11px 12px; border-radius: 10px; color: var(--navy); font-weight: 500; cursor: pointer; }
.drawer nav a:hover, .drawer nav a.active { background: var(--pale); }
.drawer-section { margin: 16px 12px 6px; font-size: 12px; font-weight: 700; color: var(--pink); text-transform: uppercase; letter-spacing: .6px; }
.conv-list { flex: 1; overflow-y: auto; }
.conv-list a { display: block; padding: 8px 12px; border-radius: 8px; color: var(--navy); font-size: 14px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.conv-list a:hover, .conv-list a.active { background: var(--pale); }
.drawer-foot { display: flex; justify-content: space-between; padding: 10px 12px 0; border-top: 1px solid var(--line); font-size: 13px; color: var(--muted); }
.scrim { position: fixed; inset: 0; background: rgba(13,24,48,.35); z-index: 30; opacity: 0; pointer-events: none; transition: opacity .2s; }
.scrim.open { opacity: 1; pointer-events: auto; }
@media (min-width: 1000px) {
  .drawer { transform: none; top: var(--top); box-shadow: none; border-right: 1px solid var(--line); }
  .scrim { display: none; }
  #menu-btn { display: none; }
  main { margin-left: 300px; }
}

/* views */
main { padding-top: var(--top); min-height: 100dvh; }
.view { display: none; }
.view.active { display: block; }
.view.pad { max-width: 820px; margin: 0 auto; padding: 18px 16px 60px; }
h2 { color: var(--pink); font-size: 20px; margin: 8px 0 6px; }

/* chat */
#view-chat.active { display: flex; flex-direction: column; height: calc(100dvh - var(--top)); }
.thread { flex: 1; overflow-y: auto; padding: 18px 16px 12px; }
.thread-inner { max-width: 780px; margin: 0 auto; }
.empty { max-width: 640px; margin: 8vh auto 0; text-align: center; }
.empty h1 { font-size: 26px; margin: 0 0 6px; }
.suggest { display: grid; gap: 10px; margin-top: 22px; text-align: left; }
.suggest button { font: 500 15px Inter, sans-serif; color: var(--navy); background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 12px 14px; text-align: left; cursor: pointer; box-shadow: var(--shadow); }
.suggest button:hover { border-color: var(--blue); }
.q { display: flex; justify-content: flex-end; margin: 18px 0 8px; }
.q div { background: var(--user); color: #fff; padding: 10px 14px; border-radius: 16px 16px 4px 16px; max-width: 85%; white-space: pre-wrap; word-wrap: break-word; }
.a { background: var(--card); border: 1px solid var(--line); border-radius: 4px 16px 16px 16px; padding: 4px 16px 10px; box-shadow: var(--shadow); overflow-x: auto; }
.a .status { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 14px; padding: 10px 0 4px; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--blue); animation: pulse 1.1s infinite ease-in-out; }
@keyframes pulse { 0%,100% { opacity: .25; transform: scale(.8); } 50% { opacity: 1; transform: scale(1); } }
.a-foot { display: flex; gap: 14px; justify-content: flex-end; margin-top: 6px; font-size: 13px; }
.a-foot button { background: none; border: 0; color: var(--muted); cursor: pointer; font: 500 13px Inter, sans-serif; padding: 2px; }
.a-foot button:hover { color: var(--pink); }
.wrong-form { margin-top: 8px; display: grid; gap: 8px; }
.wrong-form textarea, #add-text { width: 100%; border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; font: 15px Inter, sans-serif; color: var(--navy); resize: vertical; }
.composer { display: flex; gap: 8px; align-items: flex-end; max-width: 812px; width: 100%; margin: 0 auto;
  padding: 10px 16px calc(10px + var(--safe-b)); background: linear-gradient(to top, var(--bg) 70%, transparent); }
.composer textarea { flex: 1; resize: none; max-height: 180px; border: 1px solid var(--line); border-radius: 14px; padding: 12px 14px;
  font: 16px Inter, sans-serif; color: var(--navy); background: var(--card); box-shadow: var(--shadow); outline: none; }
.composer textarea:focus { border-color: var(--blue); }
.send { width: 46px; height: 46px; border-radius: 14px; border: 0; background: var(--blue); color: #fff; display: grid; place-items: center; cursor: pointer; flex: none; }
.send:disabled { background: #A9D9F7; cursor: default; }

/* markdown */
.md { font-size: 15.5px; overflow-wrap: anywhere; }
.md h1, .md h2, .md h3 { color: var(--navy); line-height: 1.3; margin: 18px 0 8px; }
.md h1 { font-size: 21px; } .md h2 { font-size: 18px; color: var(--pink); } .md h3 { font-size: 16px; }
.md p { margin: 10px 0; } .md ul, .md ol { padding-left: 22px; margin: 8px 0; } .md li { margin: 3px 0; }
.md table { border-collapse: collapse; margin: 12px 0; font-size: 14px; display: block; overflow-x: auto; max-width: 100%; }
.md th, .md td { border: 1px solid var(--line); padding: 6px 10px; text-align: left; vertical-align: top; }
.md th { background: var(--pale); font-weight: 600; }
.md code { background: var(--pale); padding: 1px 5px; border-radius: 5px; font-size: 13.5px; }
.md pre { background: var(--pale); padding: 12px; border-radius: 10px; overflow-x: auto; }
.md blockquote { border-left: 3px solid var(--pink); margin: 10px 0; padding: 2px 12px; color: var(--muted); }
.md a.cite { display: inline; font-size: 12px; font-weight: 600; background: var(--pale); color: var(--navy); border-radius: 6px; padding: 1px 6px; margin: 0 1px; overflow-wrap: anywhere; box-decoration-break: clone; -webkit-box-decoration-break: clone; }
.md a.cite:hover { background: #DCEEFC; }

/* knowledge */
.search-row input { width: 100%; height: 46px; border: 1px solid var(--line); border-radius: 12px; padding: 0 14px; font: 16px Inter, sans-serif; color: var(--navy); background: var(--card); }
.root-h { margin: 22px 0 6px; font-size: 13px; font-weight: 700; color: var(--pink); text-transform: uppercase; letter-spacing: .6px; }
.folder { margin: 10px 0 2px; font-size: 13px; font-weight: 600; color: var(--muted); }
.item { display: block; padding: 10px 12px; border-radius: 10px; background: var(--card); border: 1px solid var(--line); margin: 6px 0; color: var(--navy); }
.item:hover { border-color: var(--blue); }
.item strong { display: block; font-size: 15px; }
.item span { display: block; font-size: 13px; color: var(--muted); }
.hit { font-size: 13px; padding: 6px 0; border-bottom: 1px solid var(--line); }
.hit a { font-weight: 600; }
.page-head h1 { margin: 6px 0 4px; font-size: 24px; }
.page-meta { font-size: 13px; color: var(--muted); margin-bottom: 8px; }
.page-actions { display: flex; gap: 8px; margin: 10px 0 4px; flex-wrap: wrap; }
.page-actions .btn { height: 36px; font-size: 14px; }

/* cards, inbox, add */
.cards { display: grid; gap: 12px; margin-top: 16px; }
@media (min-width: 640px) { .cards { grid-template-columns: 1fr 1fr; } }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px; box-shadow: var(--shadow); color: var(--navy); }
.card.dl strong { display: block; font-size: 16px; margin-bottom: 4px; }
.card.dl span { color: var(--muted); font-size: 14px; }
.card.dl:hover { border-color: var(--blue); }
#add-form { display: grid; gap: 10px; margin: 10px 0 20px; }
#add-form .btn { justify-self: start; }
.row { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; margin: 8px 0; font-size: 14px; }
.row .meta { color: var(--muted); font-size: 12px; margin-bottom: 4px; display: flex; gap: 10px; flex-wrap: wrap; }
.tag { font-size: 11px; font-weight: 700; padding: 1px 7px; border-radius: 99px; background: var(--pale); }
.tag.open, .tag.new { background: #FFF4D6; color: #8A6100; }
.tag.held { background: #FDE6F2; color: var(--pink); }
.tag.live, .tag.filed, .tag.closed { background: #E3F6EA; color: #1D7A43; }