:root {
  --bg: #ffffff; --panel: #f6f6f4; --text: #1d1d1b; --muted: #6d6d68; --line: #e3e3de;
  --accent: #2f5d50; --accent-text: #fff; --user: #eaf1ee; --err: #b3261e;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #161615; --panel: #1f1f1d; --text: #ececE8; --muted: #9a9a93; --line: #2f2f2c;
    --accent: #6fae9b; --accent-text: #0e1512; --user: #223029; --err: #f2867f; }
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body { font: 16px/1.5 -apple-system, system-ui, "Segoe UI", sans-serif; background: var(--bg); color: var(--text); }
.hidden { display: none !important; }
button { font: inherit; cursor: pointer; border: 1px solid var(--line); background: var(--panel); color: var(--text);
  border-radius: 10px; padding: 8px 14px; }
button.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
button:disabled { opacity: .5; cursor: default; }
input, textarea { font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--line);
  border-radius: 10px; padding: 10px 12px; width: 100%; }

.login { min-height: 100%; display: grid; place-items: center; padding: 20px; }
.card { width: min(360px, 100%); display: grid; gap: 12px; }
.error { color: var(--err); min-height: 1.2em; margin: 0; }

.app { display: grid; grid-template-columns: 280px 1fr; height: 100dvh; }
aside { background: var(--panel); border-right: 1px solid var(--line); display: flex; flex-direction: column;
  padding: 12px; gap: 10px; min-height: 0; }
#chatList { flex: 1; overflow-y: auto; display: grid; gap: 2px; align-content: start; }
.chat-item { display: flex; align-items: center; gap: 4px; border-radius: 8px; }
.chat-item.active { background: var(--user); }
.chat-item .open { flex: 1; text-align: left; border: 0; background: none; padding: 8px 10px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.chat-item button.del { border: 0; background: none; color: var(--muted); padding: 6px 8px; }
.side-foot { display: flex; gap: 8px; }
.side-foot button { flex: 1; }

main { display: flex; flex-direction: column; min-width: 0; min-height: 0; }
header { display: flex; align-items: center; gap: 10px; padding: 10px 16px; border-bottom: 1px solid var(--line); }
header h2 { margin: 0; font-size: 1rem; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
#menu { display: none; padding: 6px 10px; }

#chatView, #docsView { flex: 1; min-height: 0; display: flex; flex-direction: column; }
#messages { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 16px; }
#messages > * { width: min(780px, 100%); margin-inline: auto; }
.msg.user { background: var(--user); padding: 10px 14px; border-radius: 14px; width: fit-content;
  max-width: min(640px, 100%); margin-inline: auto 0; white-space: pre-wrap; }
@media (min-width: 900px) { #messages > .msg.user { margin-left: auto; margin-right: max(0px, calc((100% - 780px) / 2)); } }
.msg.assistant { overflow-wrap: anywhere; }
.msg.assistant p { margin: .5em 0; }
.msg.assistant ul, .msg.assistant ol { padding-left: 1.3em; }
.msg.assistant table { border-collapse: collapse; display: block; overflow-x: auto; margin: .6em 0; }
.msg.assistant th, .msg.assistant td { border: 1px solid var(--line); padding: 6px 10px; text-align: left; vertical-align: top; }
.msg.assistant th { background: var(--panel); }
.msg.assistant code { background: var(--panel); padding: 1px 5px; border-radius: 5px; }
.msg.assistant pre { background: var(--panel); padding: 10px; border-radius: 10px; overflow-x: auto; }
sup.cite { color: var(--accent); font-weight: 600; margin: 0 1px; }
.status { color: var(--muted); font-size: .9rem; }
.status::before { content: "● "; animation: blink 1s infinite; }
@keyframes blink { 50% { opacity: .2; } }
.sources { margin-top: 8px; font-size: .85rem; color: var(--muted); }
.sources summary { cursor: pointer; }
.sources li { margin: 4px 0; }
.sources q { display: block; color: var(--muted); font-style: normal; opacity: .85; }

.empty { text-align: center; color: var(--muted); margin-top: 12vh !important; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 14px; }
.chips button { font-size: .9rem; }

#composer { display: flex; gap: 8px; padding: 10px 16px calc(10px + env(safe-area-inset-bottom)); border-top: 1px solid var(--line);
  width: min(812px, 100%); margin-inline: auto; align-items: flex-end; }
#input { resize: none; max-height: 40vh; }

#docsView { padding: 16px; overflow-y: auto; width: min(860px, 100%); margin-inline: auto; display: block; }
.docs-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.docs-head h3 { margin: 0; }
#uploadForm { display: flex; gap: 8px; flex: 1; min-width: 260px; justify-content: flex-end; }
#uploadForm input[type=text] { max-width: 280px; }
.hint { color: var(--muted); font-size: .85rem; }
.doc { border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; margin: 10px 0; }
.doc .row { display: flex; gap: 8px; align-items: baseline; justify-content: space-between; }
.doc .name { font-weight: 600; overflow-wrap: anywhere; }
.badge { font-size: .75rem; padding: 2px 8px; border-radius: 99px; background: var(--panel); border: 1px solid var(--line); white-space: nowrap; }
.badge.ready { color: var(--accent); }
.badge.error { color: var(--err); }
.doc .meta, .doc .sum { color: var(--muted); font-size: .88rem; margin: 4px 0; }
.doc .acts { display: flex; gap: 8px; margin-top: 8px; }
.doc .acts button { padding: 4px 10px; font-size: .85rem; }

.scrim { position: fixed; inset: 0; background: rgba(0,0,0,.4); z-index: 9; }
@media (max-width: 800px) {
  .app { grid-template-columns: 1fr; }
  aside { position: fixed; inset: 0 auto 0 0; width: min(300px, 86vw); z-index: 10; transform: translateX(-100%); transition: transform .2s; }
  aside.open { transform: none; }
  #menu { display: inline-block; }
}

.note-form { display: grid; gap: 8px; margin: 12px 0 4px; }
.note-form button { justify-self: end; }
.doc.note { border-left: 3px solid var(--accent); }

.note-btns { display: flex; gap: 8px; justify-content: flex-end; }

/* elenco chat: titoli piccoli, a capo, mai troncati */
#chatList { gap: 1px; }
.chat-item { align-items: flex-start; }
.chat-item .open { font-size: .8rem; line-height: 1.3; white-space: normal; overflow: visible; text-overflow: clip;
  overflow-wrap: anywhere; padding: 7px 4px 7px 8px; }
.chat-item .pin { font-size: .7rem; }
.more { border: 0; background: none; color: var(--muted); padding: 4px 8px; font-size: 1rem; line-height: 1; border-radius: 6px; flex: none; }
.more:hover { background: var(--line); color: var(--text); }
.grp { font-size: .68rem; letter-spacing: .04em; text-transform: uppercase; color: var(--muted); padding: 12px 8px 3px; }
.folder { display: flex; align-items: center; margin-top: 4px; }
.fold { flex: 1; text-align: left; border: 0; background: none; font-size: .8rem; font-weight: 600; padding: 6px 8px; overflow-wrap: anywhere; }
.fold .cnt { color: var(--muted); font-weight: 400; margin-left: 4px; }
button.link { border: 0; background: none; color: var(--muted); font-size: .8rem; text-align: left; padding: 2px 6px; }
button.link:hover { color: var(--text); }
.menu { position: fixed; z-index: 40; background: var(--bg); border: 1px solid var(--line); border-radius: 10px;
  box-shadow: 0 6px 24px rgba(0,0,0,.18); padding: 4px; min-width: 200px; max-width: 80vw; display: grid; }
.menu button { border: 0; background: none; text-align: left; padding: 9px 12px; border-radius: 7px; font-size: .88rem; overflow-wrap: anywhere; }
.menu button:hover { background: var(--panel); }
.menu button.danger { color: var(--err); }

.chat-item { cursor: grab; border-radius: 8px; }
.chat-item .open { flex: 1; text-align: left; cursor: pointer; min-width: 0; }
.chat-item.dragging { opacity: .4; }
.drop-above { box-shadow: 0 -2px 0 var(--accent); }
.drop-below { box-shadow: 0 2px 0 var(--accent); }
.drop-into { background: var(--user); outline: 1px dashed var(--accent); border-radius: 8px; }

.instr { border: 1px solid var(--line); border-radius: 12px; padding: 10px 14px; margin-bottom: 16px; }
.instr summary { cursor: pointer; font-weight: 600; }
.instr textarea { margin: 8px 0; font-size: .9rem; }
.instr-actions { display: flex; gap: 8px; align-items: center; justify-content: flex-end; flex-wrap: wrap; }
.instr-actions .hint { margin: 0 auto 0 0; }

/* gestione: tab e utenti */
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); margin-bottom: 14px; }
.tab { border: 0; border-bottom: 2px solid transparent; border-radius: 0; background: none; padding: 8px 14px; color: var(--muted); }
.tab.active { color: var(--text); border-bottom-color: var(--accent); font-weight: 600; }
.user-form { display: flex; gap: 8px; flex-wrap: wrap; margin: 10px 0 6px; }
.user-form input { flex: 1; min-width: 180px; }
.user-form select { align-self: stretch; }
.urow { display: flex; gap: 10px; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.urow .who { overflow-wrap: anywhere; }
.urow .acts { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.urow select { padding: 8px 10px; }

/* select come i campi di testo e i pulsanti */
select { font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; }
select:disabled { opacity: .55; }