:root {
  --bg: #f4f6fb; --surface: #fff; --fg: #17203a; --muted: #5d688a; --line: #dbe0ef;
  --accent: #2f4bff; --accent-ink: #fff; --danger: #c62f3b; --ok: #12805c; --mine: #e8ecff; --warn-bg: #fff3d6;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1424; --surface: #171d33; --fg: #e8ecf8; --muted: #9ba6c5; --line: #2a3354;
    --accent: #8aa0ff; --accent-ink: #0f1424; --danger: #ff7b86; --ok: #4fd1a1; --mine: #232c52; --warn-bg: #3a2f10;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body { background: var(--bg); color: var(--fg); font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
.hidden { display: none !important; }
h1, h2, h3 { margin: 0 0 8px; line-height: 1.2; }
a { color: var(--accent); }
button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; border: 1px solid var(--line); background: var(--surface); border-radius: 8px; padding: 8px 12px; }
button:hover { border-color: var(--muted); }
button.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; }
button.danger { color: var(--danger); }
button.small { padding: 3px 8px; font-size: 0.82rem; }
button:focus-visible, input:focus-visible, select:focus-visible, a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
input[type=text], input[type=password], input[type=number], select {
  width: 100%; padding: 9px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface);
}
label { display: block; margin-bottom: 10px; font-size: 0.92rem; color: var(--muted); }
label > input, label > select { margin-top: 4px; color: var(--fg); }
.err { color: var(--danger); min-height: 1.3em; margin: 6px 0; font-size: 0.92rem; }
.ok { color: var(--ok); }

.card { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 20px; }
.auth { max-width: 420px; margin: 0 auto; padding: 24px 16px; }
.tabs { display: flex; gap: 6px; margin-bottom: 14px; flex-wrap: wrap; }
.tabs button[aria-selected=true] { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
ol.rules { padding-left: 1.2em; margin: 6px 0 12px; font-size: 0.92rem; }
.checkrow { display: flex; gap: 8px; align-items: flex-start; color: var(--fg); }
.checkrow input { margin-top: 4px; width: auto; }
.codes { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 1.05rem; background: var(--bg); border-radius: 8px; padding: 10px 14px; list-style: none; margin: 10px 0; }
.warnbox { background: var(--warn-bg); border-radius: 8px; padding: 10px 12px; font-size: 0.92rem; }

/* chat */
.app { height: 100%; display: grid; grid-template-rows: auto 1fr; }
.topbar { display: flex; align-items: center; gap: 10px; padding: 10px 14px; background: var(--surface); border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.topbar .grow { flex: 1; min-width: 0; }
.topbar strong { font-size: 1.05rem; }
.layout { display: grid; grid-template-columns: 200px 1fr; min-height: 0; }
.chanlist { border-right: 1px solid var(--line); padding: 10px; overflow-y: auto; background: var(--surface); }
.chanlist button { display: block; width: 100%; text-align: left; margin-bottom: 4px; border-color: transparent; background: transparent; }
.chanlist button[aria-current=true] { background: var(--mine); font-weight: 600; }
.main { display: grid; grid-template-rows: 1fr auto; min-height: 0; min-width: 0; }
.messages { overflow-y: auto; padding: 14px; display: flex; flex-direction: column; gap: 10px; }
.msg { max-width: min(640px, 100%); background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 8px 12px; }
.msg.mine { background: var(--mine); align-self: flex-end; }
.msg .meta { font-size: 0.8rem; color: var(--muted); display: flex; gap: 8px; align-items: baseline; flex-wrap: wrap; }
.msg .meta b { color: var(--fg); }
.msg .body { white-space: pre-wrap; overflow-wrap: anywhere; margin: 2px 0; }
.msg .acts { display: flex; gap: 6px; margin-top: 4px; }
.badge { font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.05em; background: var(--accent); color: var(--accent-ink); border-radius: 99px; padding: 1px 7px; }
.composer { display: flex; gap: 8px; padding: 10px 14px; border-top: 1px solid var(--line); background: var(--surface); }
.composer input { flex: 1; min-width: 0; }
.notice { padding: 10px 14px; color: var(--muted); font-size: 0.9rem; }
details.settings { margin-left: auto; position: relative; }
details.settings > summary { cursor: pointer; padding: 6px 10px; border: 1px solid var(--line); border-radius: 8px; list-style: none; }
details.settings .panel { position: absolute; right: 0; top: 40px; width: min(340px, 90vw); z-index: 10; box-shadow: 0 8px 24px rgba(0,0,0,.2); }
.panel h3 { margin-top: 12px; font-size: 1rem; }
.row { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }

@media (max-width: 640px) {
  .layout { grid-template-columns: 1fr; grid-template-rows: auto 1fr; }
  .chanlist { border-right: 0; border-bottom: 1px solid var(--line); display: flex; gap: 4px; overflow-x: auto; padding: 6px 8px; }
  .chanlist button { width: auto; white-space: nowrap; margin: 0; }
}

/* moderator page */
.page { max-width: 900px; margin: 0 auto; padding: 16px; }
.report { margin-bottom: 12px; }
.report blockquote { margin: 8px 0; padding: 8px 12px; background: var(--bg); border-left: 3px solid var(--danger); overflow-wrap: anywhere; white-space: pre-wrap; }
.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 0.93rem; }
th, td { text-align: left; padding: 8px; border-bottom: 1px solid var(--line); vertical-align: middle; }
.muted { color: var(--muted); }
.pill { font-size: 0.75rem; border: 1px solid var(--line); border-radius: 99px; padding: 1px 8px; }
.pill.red { color: var(--danger); border-color: var(--danger); }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }

/* helpers (no inline styles allowed by the security policy) */
.plainlist { padding-left: 1.1em; margin: 4px 0; }
.spaced { margin: 10px 0; }
.between { justify-content: space-between; margin-bottom: 12px; }
.flush { margin: 0; }
.gapbelow { margin-bottom: 14px; }
select.autowidth { width: auto; }