:root {
  color-scheme: light dark;
  --bg: #f4f5f8; --card: #ffffff; --ink: #1c2740; --muted: #6b7388; --accent: #3a5bd9; --accent-ink: #ffffff;
  --line: #d7dae3; --mine: #e6ecff; --err: #c0392b;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #11151f; --card: #1a2030; --ink: #e8ecf6; --muted: #98a1b8; --accent: #6f8cff; --accent-ink: #0d1220;
          --line: #2b3347; --mine: #1f2b4d; --err: #ff7b6b; }
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body { display: flex; flex-direction: column; }
body { background: var(--bg); color: var(--ink); font: 16px/1.4 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
       padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left); }
[hidden] { display: none !important; }
.center { text-align: center; } .muted { color: var(--muted); } .error { color: var(--err); min-height: 1.4em; margin: .25rem 0; }
.spacer { flex: 1; }
button, select, input[type=text], input[type=email], input[type=password], input[type=search] {
  font: inherit; color: var(--ink); background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: .5rem .75rem; }
button { cursor: pointer; } button:disabled { opacity: .5; cursor: default; }
button.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; }
button.small { padding: .1rem .5rem; font-size: .85rem; }
input:focus-visible, button:focus-visible, select:focus-visible, .msg:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.install { display: flex; gap: .5rem; align-items: center; flex-wrap: wrap; padding: .5rem .75rem; background: var(--mine);
  border-bottom: 1px solid var(--line); font-size: .9rem; }
.install span { flex: 1; min-width: 12rem; } .install a { color: var(--accent); }
#auth { width: 100%; max-width: 380px; margin: 0 auto; padding: 2rem 1rem; }
#auth h1 { text-align: center; }
.tabs { display: flex; gap: .5rem; margin-bottom: 1rem; } .tabs button { flex: 1; }
.tabs [aria-selected=true] { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
#auth label { display: block; margin-bottom: .75rem; } #auth input { width: 100%; margin-top: .25rem; }

.home { flex: 1; min-height: 0; overflow: auto; padding: .5rem .75rem 1rem; }
.home-bar { display: flex; align-items: center; justify-content: space-between; gap: .5rem; flex-wrap: wrap; }
.home-bar h2 { margin: .4rem 0; }
.conversations { list-style: none; margin: .5rem 0; padding: 0; }
.conversations li { margin-bottom: .5rem; }
.conv { display: flex; align-items: center; gap: .6rem; width: 100%; text-align: left; padding: .6rem .75rem; border-radius: 12px; }
.conv .text { flex: 1; min-width: 0; } .conv .name { display: block; font-weight: 600; }
.conv .last { display: block; color: var(--muted); font-size: .85rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.conv .when { color: var(--muted); font-size: .8rem; align-self: flex-start; }
.badge.unread { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 700; margin: 0; }
#conversation { display: flex; flex-direction: column; flex: 1; min-height: 0; }
.conv-bar { display: flex; align-items: center; gap: .6rem; padding: .4rem .75rem; border-bottom: 1px solid var(--line); background: var(--card); }
.newconv .chosen { display: flex; gap: .4rem; flex-wrap: wrap; margin: .5rem 0; min-height: 2rem; }
.newconv .results { list-style: none; margin: .5rem 0; padding: 0; max-height: 30vh; overflow: auto; }
.newconv .results button { width: 100%; text-align: left; margin-bottom: .25rem; }
.newconv input { width: 100%; margin: .25rem 0; }
.main-tabs { padding: .4rem .75rem 0; margin: 0; } .main-tabs button { padding: .35rem .75rem; }
.admin { flex: 1; min-height: 0; overflow: auto; padding: .5rem .75rem 1rem; }
.admin h2, .admin h3 { margin: .6rem 0 .3rem; } .ok { color: #2e8b57; min-height: 1.4em; margin: .25rem 0; }
.accounts, .log { list-style: none; margin: 0; padding: 0; }
.account { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: .5rem .6rem; margin-bottom: .5rem; }
.account .who { margin-bottom: .35rem; } .account .actions { display: flex; gap: .4rem; flex-wrap: wrap; }
.badge { display: inline-block; margin-left: .4rem; padding: 0 .45rem; border-radius: 999px; font-size: .75rem; background: var(--mine); color: var(--ink); border: 1px solid var(--line); }
.badge.warn { border-color: #c98a00; color: #c98a00; }
button.danger { color: var(--err); border-color: var(--err); }
.log li { font-size: .85rem; color: var(--muted); margin-bottom: .2rem; }
#reset { width: 100%; max-width: 380px; margin: 0 auto; padding: 2rem 1rem; } #reset h1 { text-align: center; }
#reset label { display: block; margin-bottom: .75rem; } #reset input { width: 100%; margin-top: .25rem; }
#chat { display: flex; flex-direction: column; flex: 1; min-height: 0; width: 100%; max-width: 900px; margin: 0 auto; }
#chat header { display: flex; align-items: center; gap: .5rem; padding: .5rem .75rem; background: var(--card); border-bottom: 1px solid var(--line); flex-wrap: wrap; }
#hint { margin: .25rem 0; font-size: .85rem; }
#messages { flex: 1; overflow: auto; padding: .5rem .75rem; display: flex; flex-direction: column; gap: .5rem; }
.msg { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: .4rem .6rem; max-width: 100%;
       align-self: flex-start; -webkit-touch-callout: none; -webkit-user-select: none; user-select: none; touch-action: pan-x pan-y; }
.msg.mine { align-self: flex-end; background: var(--mine); }
.msg .meta { font-size: .8rem; color: var(--muted); } .drawing { overflow-x: auto; }
svg { display: block; max-width: none; } svg .k { stroke: var(--ink); } svg .r { stroke: #d23b3b; } svg .g { stroke: #8a8f98; }
svg line { stroke-linecap: round; fill: none; }

#composer { background: var(--card); border-top: 1px solid var(--line); padding: .5rem .75rem; }
.preview { overflow-x: auto; max-height: 190px; min-height: 8px; }
.chips { display: flex; gap: .4rem; flex-wrap: wrap; margin: .25rem 0; }
.chip { padding: .15rem .6rem; } .chip.on { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.options { display: flex; gap: .75rem; flex-wrap: wrap; align-items: center; margin-bottom: .4rem; font-size: .9rem; }
#compose-form { display: flex; gap: .5rem; } #compose-text { flex: 1; min-width: 0; }

dialog { border: 1px solid var(--line); border-radius: 12px; background: var(--card); color: var(--ink); max-width: min(640px, 94vw); width: 100%; max-height: 90vh; overflow: auto; }
dialog::backdrop { background: rgba(0, 0, 0, .5); }
.scroll { overflow: auto; max-height: 45vh; border: 1px solid var(--line); border-radius: 8px; padding: .25rem; }
.literal { font-size: 1.15rem; font-weight: 600; }
.rows { padding-left: 1.2rem; } .rows li { margin-bottom: .5rem; }
.split { display: flex; gap: .75rem; margin: .5rem 0; } .split .list { flex: 1; } .split .scroll { flex: 1; }
.list { list-style: none; margin: 0; padding: 0; max-height: 45vh; overflow: auto; }
.list button { width: 100%; text-align: left; margin-bottom: .25rem; } .list button.on { border-color: var(--accent); background: var(--mine); }
.inline { display: flex; gap: .5rem; flex-wrap: wrap; margin: .5rem 0; } .inline input { flex: 1; min-width: 8rem; }
.alphabet { display: grid; grid-template-columns: repeat(auto-fill, minmax(70px, 1fr)); gap: .5rem; margin-bottom: .75rem; }
.alphabet figure { margin: 0; text-align: center; } .alphabet figcaption { font-weight: 700; }
@media (max-width: 520px) { .split { flex-direction: column; } }