:root {
  --bg: #0b0f14;
  --panel: #121821;
  --panel-2: #18202b;
  --border: #233040;
  --text: #e6edf3;
  --muted: #93a4b5;
  --teal: #2dd4bf;
  --blue: #3b82f6;
  --user: #1c2733;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg); color: var(--text);
  font: 15px/1.6 "Segoe UI", system-ui, -apple-system, sans-serif;
}
#app { display: flex; height: 100vh; }

/* sidebar */
#sidebar {
  width: 260px; flex: 0 0 260px; background: var(--panel);
  border-right: 1px solid var(--border); display: flex; flex-direction: column; padding: 14px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; margin: 4px 4px 18px; }
.logo {
  width: 28px; height: 28px; border-radius: 8px; display: grid; place-items: center;
  font-weight: 800; color: #06121f;
  background: linear-gradient(135deg, var(--teal), var(--blue));
}
.logo.big { width: 56px; height: 56px; border-radius: 16px; font-size: 28px; margin: 0 auto 18px; }
.logo-img { width: 30px; height: 30px; border-radius: 50%; object-fit: cover; flex: 0 0 auto; }
.logo-img.big { width: 76px; height: 76px; display: block; margin: 0 auto 18px; }
.wordmark { font-weight: 700; font-size: 18px; }
.newchat {
  background: var(--panel-2); color: var(--text); border: 1px solid var(--border);
  border-radius: 10px; padding: 10px 12px; cursor: pointer; text-align: left; font-size: 14px;
}
.newchat:hover { border-color: var(--teal); }
.chatlist { flex: 1; overflow-y: auto; margin-top: 14px; display: flex; flex-direction: column; gap: 2px; }
.chatlist .item {
  display: flex; align-items: center; gap: 6px;
  padding: 9px 10px; border-radius: 8px; color: var(--muted); cursor: pointer; font-size: 14px;
}
.chatlist .item .item-title { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.chatlist .item:hover { background: var(--panel-2); color: var(--text); }
.chatlist .item.active { background: var(--panel-2); color: var(--text); }
.chatdel { visibility: hidden; flex-shrink: 0; border: none; background: transparent; color: var(--muted); cursor: pointer; font-size: 13px; padding: 0 2px; }
.chatlist .item:hover .chatdel { visibility: visible; }
.chatdel:hover { color: #ef4444; }
.docs { border-top: 1px solid var(--border); padding-top: 10px; margin-top: 8px; max-height: 32vh; display: flex; flex-direction: column; }
.docs-head { display: flex; align-items: center; justify-content: space-between; color: var(--muted); font-size: 12px; font-weight: 600; letter-spacing: .04em; text-transform: uppercase; padding: 0 4px 6px; }
.docs-actions { display: flex; gap: 4px; }
.adddoc { width: 22px; height: 22px; border-radius: 6px; border: 1px solid var(--border); background: var(--panel-2); color: var(--text); cursor: pointer; line-height: 1; }
.adddoc:hover { border-color: var(--teal); }
.doccount { color: var(--teal); font-weight: 700; }
.doclist { overflow-y: auto; display: flex; flex-direction: column; gap: 2px; }
.docitem { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); padding: 5px 6px; border-radius: 6px; }
.docitem:hover { background: var(--panel-2); color: var(--text); }
.docname { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.docmeta { font-size: 11px; color: var(--muted); background: var(--panel-2); border: 1px solid var(--border); border-radius: 999px; padding: 0 6px; min-width: 16px; text-align: center; }
.docdel { visibility: hidden; border: none; background: transparent; color: var(--muted); cursor: pointer; font-size: 13px; padding: 0 2px; }
.docitem:hover .docdel { visibility: visible; }
.docdel:hover { color: #ef4444; }
.docempty { font-size: 12px; color: var(--muted); padding: 6px; line-height: 1.5; }
.userbar { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 8px 4px 0; border-top: 1px solid var(--border); margin-top: 8px; }
.uname { font-size: 13px; color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.logoutbtn { background: transparent; border: 1px solid var(--border); color: var(--muted); border-radius: 8px; padding: 5px 9px; cursor: pointer; font-size: 12px; flex: 0 0 auto; }
.logoutbtn:hover { border-color: var(--teal); color: var(--text); }
.download-app { display: block; margin-top: 10px; padding: 8px 10px; border: 1px solid var(--border); border-radius: 8px; color: var(--muted); text-decoration: none; font-size: 13px; text-align: center; }
.download-app:hover { border-color: var(--teal); color: var(--text); }
.side-foot { color: var(--muted); font-size: 12px; padding: 10px 4px 4px; opacity: .7; }

.auth-overlay { position: fixed; inset: 0; background: rgba(8,12,18,.94); display: flex; align-items: center; justify-content: center; z-index: 50; }
.auth-overlay[hidden] { display: none; }
.ver-banner { display: flex; align-items: center; gap: 10px; background: #6b4e12; color: #ffe6a8;
  padding: 7px 14px; font-size: 13px; border-bottom: 1px solid var(--border); }
.ver-banner[hidden] { display: none; }
.ver-banner span { flex: 1; }
.ver-banner button { background: transparent; border: none; color: inherit; cursor: pointer; font-size: 14px; opacity: .8; }
.ver-banner button:hover { opacity: 1; }
.wheel-overlay { position: fixed; inset: 0; background: rgba(8,12,18,.78); display: flex; align-items: center; justify-content: center; z-index: 60; }
.wheel-overlay[hidden] { display: none; }
.wheel-card { background: var(--panel); border: 1px solid var(--teal); border-radius: 16px; padding: 24px; width: 360px; max-width: 86vw; text-align: center; box-shadow: 0 12px 40px rgba(0,0,0,.5); }
.wheel-title { font-size: 18px; font-weight: 700; color: var(--teal); margin-bottom: 10px; }
.wheel-text { color: var(--text); font-size: 14px; line-height: 1.5; margin-bottom: 18px; }
.wheel-btns { display: flex; gap: 10px; justify-content: center; }
.wheel-btns .auth-btn, .wheel-btns .ghostbtn { min-width: 96px; }
.auth-card { background: var(--panel); border: 1px solid var(--border); border-radius: 16px; padding: 30px 28px; width: 330px; text-align: center; }
.auth-card h2 { font-size: 19px; font-weight: 600; margin: 6px 0 18px; }
.auth-card input { width: 100%; box-sizing: border-box; background: var(--panel-2); border: 1px solid var(--border); border-radius: 10px; padding: 11px 12px; color: var(--text); margin-bottom: 10px; font: inherit; }
.auth-card input:focus { outline: none; border-color: var(--teal); }
.auth-btn { width: 100%; border: none; border-radius: 10px; padding: 11px; cursor: pointer; font-weight: 700; color: #06121f; background: linear-gradient(135deg, var(--teal), var(--blue)); font-size: 14px; }
.auth-error { color: #f87171; font-size: 13px; min-height: 18px; margin-bottom: 4px; }
.auth-switch { margin-top: 14px; font-size: 13px; }
.auth-switch a { color: var(--teal); cursor: pointer; }
.ms-btn { display: block; box-sizing: border-box; text-decoration: none; color: #1b1b1b; background: #fff; margin-bottom: 10px; }
.ms-btn:hover { filter: brightness(0.94); }
.auth-divider { font-size: 12px; opacity: .55; margin: 2px 0 10px; }

/* admin */
.admin-wrap { max-width: 860px; margin: 0 auto; padding: 24px 20px 60px; }
.admin-top { display: flex; align-items: center; gap: 16px; margin-bottom: 18px; }
.admin-top h1 { font-size: 22px; margin: 0; }
.back { color: var(--teal); text-decoration: none; font-size: 14px; }
.denied { color: var(--muted); padding: 40px; text-align: center; }
.denied a { color: var(--teal); }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: 14px; padding: 18px 20px; margin-bottom: 18px; }
.card h2 { font-size: 16px; margin: 0 0 14px; }
.sysgrid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 10px; }
.svc { display: flex; align-items: center; gap: 8px; background: var(--panel-2); border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; font-size: 14px; }
.svc .dot { width: 9px; height: 9px; border-radius: 50%; background: #ef4444; }
.svc.up .dot { background: #22c55e; }
.svc .st { margin-left: auto; color: var(--muted); font-size: 12px; }
.form { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.form label { display: flex; flex-direction: column; gap: 5px; font-size: 13px; color: var(--muted); }
.form label.full { grid-column: 1 / -1; }
.form input, .form select, .form textarea { background: var(--panel-2); border: 1px solid var(--border); border-radius: 9px; padding: 9px 11px; color: var(--text); font: inherit; }
.form input:focus, .form select:focus, .form textarea:focus { outline: none; border-color: var(--teal); }
.auth-btn.small { width: auto; padding: 9px 18px; }
.pullrow { display: flex; gap: 8px; margin-bottom: 10px; }
.pullrow input { flex: 1; background: var(--panel-2); border: 1px solid var(--border); border-radius: 9px; padding: 9px 11px; color: var(--text); font: inherit; }
.pullprog { color: var(--teal); font-size: 13px; min-height: 18px; margin-bottom: 8px; }
.rows { display: flex; flex-direction: column; gap: 6px; }
.row { display: flex; align-items: center; gap: 10px; background: var(--panel-2); border: 1px solid var(--border); border-radius: 10px; padding: 9px 12px; }
.row .rn { flex: 1; font-size: 14px; }
.row .rsz { color: var(--muted); font-size: 13px; }
.badge { font-size: 11px; color: var(--teal); border: 1px solid var(--teal); border-radius: 999px; padding: 1px 7px; margin-left: 6px; }
.mini { background: var(--panel); border: 1px solid var(--border); color: var(--text); border-radius: 8px; padding: 5px 10px; font-size: 12px; cursor: pointer; }
.mini:hover { border-color: var(--teal); }
.mini.danger:hover { border-color: #ef4444; color: #ef4444; }

/* main */
#main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
#topbar { display: flex; align-items: center; gap: 12px; padding: 12px 18px; border-bottom: 1px solid var(--border); }
#modelSelect {
  background: var(--panel-2); color: var(--text); border: 1px solid var(--border);
  border-radius: 8px; padding: 7px 10px; font-size: 14px; cursor: pointer;
}
.status { color: var(--muted); font-size: 13px; }

.messages { flex: 1; overflow-y: auto; padding: 24px 0 8px; }
.welcome { text-align: center; margin-top: 16vh; color: var(--muted); }
.welcome h1 { color: var(--text); font-weight: 600; font-size: 26px; }

.turn { position: relative; max-width: 760px; margin: 0 auto; padding: 6px 24px; }
.turn .role { font-size: 12px; color: var(--muted); margin: 14px 0 4px; font-weight: 600; letter-spacing: .03em; }
.turn-del { position: absolute; top: 14px; right: 24px; visibility: hidden; border: none; background: transparent; color: var(--muted); cursor: pointer; font-size: 13px; padding: 2px 6px; border-radius: 6px; line-height: 1; }
.turn:hover .turn-del { visibility: visible; }
.turn-del:hover { color: #ef4444; background: var(--panel-2); }
.turn-copy { position: absolute; top: 14px; right: 52px; visibility: hidden; border: none; background: transparent; color: var(--muted); cursor: pointer; font-size: 13px; padding: 2px 6px; border-radius: 6px; line-height: 1; }
.turn:hover .turn-copy { visibility: visible; }
.turn-copy:hover { color: var(--teal); background: var(--panel-2); }
.turn.user .bubble { background: var(--user); border: 1px solid var(--border); border-radius: 12px; padding: 12px 14px; }
.turn.assistant .bubble { padding: 2px 0; }
.bubble { white-space: pre-wrap; word-wrap: break-word; }
.bubble pre { background: #0a0e13; border: 1px solid var(--border); border-radius: 10px; padding: 12px; overflow-x: auto; }
.codeblock { margin: 8px 0; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; }
.codebar { display: flex; align-items: center; justify-content: space-between; background: var(--panel); padding: 5px 8px 5px 12px; border-bottom: 1px solid var(--border); }
.codelang { color: var(--muted); font-size: 12px; }
.copybtn { background: var(--panel-2); border: 1px solid var(--border); color: var(--text); border-radius: 6px; padding: 3px 12px; font-size: 12px; cursor: pointer; }
.copybtn:hover { border-color: var(--teal); color: var(--teal); }
.codeblock pre { margin: 0; border: none; border-radius: 0; }
.bubble code { font-family: "Cascadia Code", Consolas, monospace; font-size: 13px; }
.turn .think { display: none; margin: 4px 0 8px; border: 1px solid var(--border); border-radius: 8px; background: var(--panel); }
.turn .think summary { cursor: pointer; padding: 6px 10px; color: var(--muted); font-size: 13px; user-select: none; }
.turn .think .think-body { padding: 0 10px 10px; color: var(--muted); font-size: 13px; white-space: pre-wrap; }
.turn .think.thinking summary { color: var(--teal); animation: thinkpulse 1.2s ease-in-out infinite; }
@keyframes thinkpulse { 50% { opacity: .45; } }
.genimages { display: flex; flex-wrap: wrap; gap: 10px; margin: 8px 0; }
.genimg { max-width: 100%; width: 420px; border-radius: 12px; border: 1px solid var(--border); cursor: zoom-in; }
.genvideo { max-width: 100%; width: 480px; border-radius: 12px; border: 1px solid var(--border); background: #000; }
.turn .usage { margin-top: 6px; color: var(--muted); font-size: 11.5px; opacity: .75;
  font-variant-numeric: tabular-nums; letter-spacing: .01em; }
.toolchips { display: flex; flex-wrap: wrap; gap: 6px; margin: 4px 0; }
.chip { font-size: 12px; padding: 3px 9px; border-radius: 999px; border: 1px solid var(--border);
  background: var(--panel); color: var(--muted); }
.chip.done { color: var(--teal); border-color: var(--teal); }
.cursor::after { content: "▋"; color: var(--teal); animation: blink 1s steps(2) infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* composer */
.composer-wrap { padding: 10px 24px 18px; }
.mic.on { border-color: var(--teal); color: var(--teal); }
.imgopts { max-width: 760px; margin: 0 auto 8px; display: flex; flex-wrap: wrap; align-items: center; gap: 10px;
  background: var(--panel-2); border: 1px solid var(--border); border-radius: 12px; padding: 8px 12px; font-size: 13px; color: var(--muted); }
.imgopts[hidden] { display: none; }   /* let the hidden attribute win over display:flex */
.imgopts-title { font-weight: 600; color: var(--text); }
.imgopts label { display: flex; align-items: center; gap: 6px; color: var(--muted); }
.imgopts select { background: var(--panel); border: 1px solid var(--border); border-radius: 8px; color: var(--text); font: inherit; padding: 4px 8px; }
.imgopts-note { color: var(--muted); font-size: 12px; margin-left: auto; }
.attach-preview { display: flex; gap: 14px; max-width: 760px; margin: 0 auto 8px; width: max-content; }
.attach-item { position: relative; display: inline-block; }
.attach-preview img { max-height: 96px; border-radius: 10px; border: 1px solid var(--border); display: block; }
.attach-item button { position: absolute; top: -8px; right: -8px; width: 22px; height: 22px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--panel); color: var(--text); cursor: pointer; font-size: 12px; line-height: 1; }
.attach-item button:hover { border-color: var(--teal); }
.attach-tag { position: absolute; bottom: 4px; left: 4px; padding: 1px 6px; border-radius: 6px; font-size: 10px;
  font-weight: 600; letter-spacing: .04em; text-transform: uppercase; background: rgba(0,0,0,.6); color: #fff; }
.composer {
  max-width: 760px; margin: 0 auto; display: flex; align-items: flex-end; gap: 8px;
  background: var(--panel-2); border: 1px solid var(--border); border-radius: 16px; padding: 8px 8px 8px 14px;
}
.composer:focus-within { border-color: var(--teal); }
#input {
  flex: 1; background: transparent; border: none; outline: none; color: var(--text);
  resize: none; font: inherit; max-height: 200px; padding: 6px 0;
}
#send {
  width: 36px; height: 36px; border-radius: 10px; border: none; cursor: pointer; font-size: 18px;
  background: linear-gradient(135deg, var(--teal), var(--blue)); color: #06121f; font-weight: 700;
}
#send:disabled { opacity: .4; cursor: default; }
#send.stopping { background: linear-gradient(135deg, #e25c5c, #c0392b); color: #fff; }
.mic { width: 36px; height: 36px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--panel); color: var(--text); cursor: pointer; font-size: 15px; }
.mic:hover { border-color: var(--teal); }
.mic.recording { background: #7f1d1d; border-color: #ef4444; color: #fff; animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: .55; } }
.ghostbtn { background: transparent; border: 1px solid var(--border); color: var(--muted);
  border-radius: 8px; padding: 6px 10px; cursor: pointer; font-size: 13px; margin-left: auto; }
.ghostbtn.on { color: var(--teal); border-color: var(--teal); }
.hint { max-width: 760px; margin: 8px auto 0; text-align: center; color: var(--muted); font-size: 12px; }

/* hamburger + drawer scrim (hidden on desktop) */
.menubtn { display: none; width: 38px; height: 38px; border-radius: 9px; border: 1px solid var(--border);
  background: var(--panel-2); color: var(--text); font-size: 18px; line-height: 1; cursor: pointer; }
.nav-scrim { display: none; }

/* ---- mobile / installed PWA ---- */
@media (max-width: 760px) {
  #app { height: 100dvh; }
  .menubtn { display: inline-flex; align-items: center; justify-content: center; }
  /* sidebar slides in as a drawer instead of taking a fixed column */
  #sidebar { position: fixed; z-index: 60; top: 0; left: 0; bottom: 0; width: 82vw; max-width: 320px;
    transform: translateX(-100%); transition: transform .22s ease;
    padding-top: calc(14px + env(safe-area-inset-top)); box-shadow: 0 0 40px rgba(0,0,0,.6); }
  #app.nav-open #sidebar { transform: translateX(0); }
  .nav-scrim { display: block; position: fixed; inset: 0; z-index: 55; background: rgba(0,0,0,.5);
    opacity: 0; pointer-events: none; transition: opacity .22s ease; }
  #app.nav-open .nav-scrim { opacity: 1; pointer-events: auto; }
  #topbar { gap: 8px; padding: 10px 14px; padding-top: calc(10px + env(safe-area-inset-top)); }
  #modelSelect { max-width: 45vw; }
  .messages { padding: 16px 0 8px; }
  .composer-wrap { padding: 8px 12px calc(12px + env(safe-area-inset-bottom)); }
  #input { font-size: 16px; }   /* >=16px stops iOS zoom-on-focus */
}